diff options
Diffstat (limited to 'drivers/usb/host/hc_crisv10.c')
| -rw-r--r-- | drivers/usb/host/hc_crisv10.c | 4556 |
1 files changed, 4556 insertions, 0 deletions
diff --git a/drivers/usb/host/hc_crisv10.c b/drivers/usb/host/hc_crisv10.c new file mode 100644 index 000000000000..4b12be822bd4 --- /dev/null +++ b/drivers/usb/host/hc_crisv10.c @@ -0,0 +1,4556 @@ +/* + * usb-host.c: ETRAX 100LX USB Host Controller Driver (HCD) + * + * Copyright (c) 2002, 2003 Axis Communications AB. + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/ioport.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/unistd.h> +#include <linux/interrupt.h> +#include <linux/init.h> +#include <linux/version.h> +#include <linux/list.h> +#include <linux/spinlock.h> + +#include <asm/uaccess.h> +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/dma.h> +#include <asm/system.h> +#include <asm/arch/svinto.h> + +#include <linux/usb.h> +/* Ugly include because we don't live with the other host drivers. */ +#include <../drivers/usb/core/hcd.h> +#include <../drivers/usb/core/usb.h> + +#include "hc_crisv10.h" + +#define ETRAX_USB_HC_IRQ USB_HC_IRQ_NBR +#define ETRAX_USB_RX_IRQ USB_DMA_RX_IRQ_NBR +#define ETRAX_USB_TX_IRQ USB_DMA_TX_IRQ_NBR + +static const char *usb_hcd_version = "$Revision: 1.2 $"; + +#undef KERN_DEBUG +#define KERN_DEBUG "" + + +#undef USB_DEBUG_RH +#undef USB_DEBUG_EPID +#undef USB_DEBUG_SB +#undef USB_DEBUG_DESC +#undef USB_DEBUG_URB +#undef USB_DEBUG_TRACE +#undef USB_DEBUG_BULK +#undef USB_DEBUG_CTRL +#undef USB_DEBUG_INTR +#undef USB_DEBUG_ISOC + +#ifdef USB_DEBUG_RH +#define dbg_rh(format, arg...) printk(KERN_DEBUG __FILE__ ": (RH) " format "\n" , ## arg) +#else +#define dbg_rh(format, arg...) do {} while (0) +#endif + +#ifdef USB_DEBUG_EPID +#define dbg_epid(format, arg...) printk(KERN_DEBUG __FILE__ ": (EPID) " format "\n" , ## arg) +#else +#define dbg_epid(format, arg...) do {} while (0) +#endif + +#ifdef USB_DEBUG_SB +#define dbg_sb(format, arg...) printk(KERN_DEBUG __FILE__ ": (SB) " format "\n" , ## arg) +#else +#define dbg_sb(format, arg...) do {} while (0) +#endif + +#ifdef USB_DEBUG_CTRL +#define dbg_ctrl(format, arg...) printk(KERN_DEBUG __FILE__ ": (CTRL) " format "\n" , ## arg) +#else +#define dbg_ctrl(format, arg...) do {} while (0) +#endif + +#ifdef USB_DEBUG_BULK +#define dbg_bulk(format, arg...) printk(KERN_DEBUG __FILE__ ": (BULK) " format "\n" , ## arg) +#else +#define dbg_bulk(format, arg...) do {} while (0) +#endif + +#ifdef USB_DEBUG_INTR +#define dbg_intr(format, arg...) printk(KERN_DEBUG __FILE__ ": (INTR) " format "\n" , ## arg) +#else +#define dbg_intr(format, arg...) do {} while (0) +#endif + +#ifdef USB_DEBUG_ISOC +#define dbg_isoc(format, arg...) printk(KERN_DEBUG __FILE__ ": (ISOC) " format "\n" , ## arg) +#else +#define dbg_isoc(format, arg...) do {} while (0) +#endif + +#ifdef USB_DEBUG_TRACE +#define DBFENTER (printk(": Entering: %s\n", __FUNCTION__)) +#define DBFEXIT (printk(": Exiting: %s\n", __FUNCTION__)) +#else +#define DBFENTER do {} while (0) +#define DBFEXIT do {} while (0) +#endif + +#define usb_pipeslow(pipe) (((pipe) >> 26) & 1) + +/*------------------------------------------------------------------- + Virtual Root Hub + -------------------------------------------------------------------*/ + +static __u8 root_hub_dev_des[] = +{ + 0x12, /* __u8 bLength; */ + 0x01, /* __u8 bDescriptorType; Device */ + 0x00, /* __le16 bcdUSB; v1.0 */ + 0x01, + 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */ + 0x00, /* __u8 bDeviceSubClass; */ + 0x00, /* __u8 bDeviceProtocol; */ + 0x08, /* __u8 bMaxPacketSize0; 8 Bytes */ + 0x00, /* __le16 idVendor; */ + 0x00, + 0x00, /* __le16 idProduct; */ + 0x00, + 0x00, /* __le16 bcdDevice; */ + 0x00, + 0x00, /* __u8 iManufacturer; */ + 0x02, /* __u8 iProduct; */ + 0x01, /* __u8 iSerialNumber; */ + 0x01 /* __u8 bNumConfigurations; */ +}; + +/* Configuration descriptor */ +static __u8 root_hub_config_des[] = +{ + 0x09, /* __u8 bLength; */ + 0x02, /* __u8 bDescriptorType; Configuration */ + 0x19, /* __le16 wTotalLength; */ + 0x00, + 0x01, /* __u8 bNumInterfaces; */ + 0x01, /* __u8 bConfigurationValue; */ + 0x00, /* __u8 iConfiguration; */ + 0x40, /* __u8 bmAttributes; Bit 7: Bus-powered */ + 0x00, /* __u8 MaxPower; */ + + /* interface */ + 0x09, /* __u8 if_bLength; */ + 0x04, /* __u8 if_bDescriptorType; Interface */ + 0x00, /* __u8 if_bInterfaceNumber; */ + 0x00, /* __u8 if_bAlternateSetting; */ + 0x01, /* __u8 if_bNumEndpoints; */ + 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */ + 0x00, /* __u8 if_bInterfaceSubClass; */ + 0x00, /* __u8 if_bInterfaceProtocol; */ + 0x00, /* __u8 if_iInterface; */ + + /* endpoint */ + 0x07, /* __u8 ep_bLength; */ + 0x05, /* __u8 ep_bDescriptorType; Endpoint */ + 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */ + 0x03, /* __u8 ep_bmAttributes; Interrupt */ + 0x08, /* __le16 ep_wMaxPacketSize; 8 Bytes */ + 0x00, + 0xff /* __u8 ep_bInterval; 255 ms */ +}; + +static __u8 root_hub_hub_des[] = +{ + 0x09, /* __u8 bLength; */ + 0x29, /* __u8 bDescriptorType; Hub-descriptor */ + 0x02, /* __u8 bNbrPorts; */ + 0x00, /* __u16 wHubCharacteristics; */ + 0x00, + 0x01, /* __u8 bPwrOn2pwrGood; 2ms */ + 0x00, /* __u8 bHubContrCurrent; 0 mA */ + 0x00, /* __u8 DeviceRemovable; *** 7 Ports max *** */ + 0xff /* __u8 PortPwrCtrlMask; *** 7 ports max *** */ +}; + +static struct timer_list bulk_start_timer = TIMER_INITIALIZER(NULL, 0, 0); +static struct timer_list bulk_eot_timer = TIMER_INITIALIZER(NULL, 0, 0); + +/* We want the start timer to expire before the eot timer, because the former might start + traffic, thus making it unnecessary for the latter to time out. */ +#define BULK_START_TIMER_INTERVAL (HZ/10) /* 100 ms */ +#define BULK_EOT_TIMER_INTERVAL (HZ/10+2) /* 120 ms */ + +#define OK(x) len = (x); dbg_rh("OK(%d): line: %d", x, __LINE__); break +#define CHECK_ALIGN(x) if (((__u32)(x)) & 0x00000003) \ +{panic("Alignment check (DWORD) failed at %s:%s:%d\n", __FILE__, __FUNCTION__, __LINE__);} + +#define SLAB_FLAG (in_interrupt() ? SLAB_ATOMIC : SLAB_KERNEL) +#define KMALLOC_FLAG (in_interrupt() ? GFP_ATOMIC : GFP_KERNEL) + +/* Most helpful debugging aid */ +#define assert(expr) ((void) ((expr) ? 0 : (err("assert failed at line %d",__LINE__)))) + +/* Alternative assert define which stops after a failed assert. */ +/* +#define assert(expr) \ +{ \ + if (!(expr)) { \ + err("assert failed at line %d",__LINE__); \ + while (1); \ + } \ +} +*/ + + +/* FIXME: Should RX_BUF_SIZE be a config option, or maybe we should adjust it dynamically? + To adjust it dynamically we would have to get an interrupt when we reach the end + of the rx descriptor list, or when we get close to the end, and then allocate more + descriptors. */ + +#define NBR_OF_RX_DESC 512 +#define RX_DESC_BUF_SIZE 1024 +#define RX_BUF_SIZE (NBR_OF_RX_DESC * RX_DESC_BUF_SIZE) + +/* The number of epids is, among other things, used for pre-allocating + ctrl, bulk and isoc EP descriptors (one for each epid). + Assumed to be > 1 when initiating the DMA lists. */ +#define NBR_OF_EPIDS 32 + +/* Support interrupt traffic intervals up to 128 ms. */ +#define MAX_INTR_INTERVAL 128 + +/* If periodic traffic (intr or isoc) is to be used, then one entry in the EP table + must be "invalid". By this we mean that we shouldn't care about epid attentions + for this epid, or at least handle them differently from epid attentions for "valid" + epids. This define determines which one to use (don't change it). */ +#define INVALID_EPID 31 +/* A special epid for the bulk dummys. */ +#define DUMMY_EPID 30 + +/* This is just a software cache for the valid entries in R_USB_EPT_DATA. */ +static __u32 epid_usage_bitmask; + +/* A bitfield to keep information on in/out traffic is needed to uniquely identify + an endpoint on a device, since the most significant bit which indicates traffic + direction is lacking in the ep_id field (ETRAX epids can handle both in and + out traffic on endpoints that are otherwise identical). The USB framework, however, + relies on them to be handled separately. For example, bulk IN and OUT urbs cannot + be queued in the same list, since they would block each other. */ +static __u32 epid_out_traffic; + +/* DMA IN cache bug. Align the DMA IN buffers to 32 bytes, i.e. a cache line. + Since RX_DESC_BUF_SIZE is 1024 is a multiple of 32, all rx buffers will be cache aligned. */ +static volatile unsigned char RxBuf[RX_BUF_SIZE] __attribute__ ((aligned (32))); +static volatile USB_IN_Desc_t RxDescList[NBR_OF_RX_DESC] __attribute__ ((aligned (4))); + +/* Pointers into RxDescList. */ +static volatile USB_IN_Desc_t *myNextRxDesc; +static volatile USB_IN_Desc_t *myLastRxDesc; +static volatile USB_IN_Desc_t *myPrevRxDesc; + +/* EP descriptors must be 32-bit aligned. */ +static volatile USB_EP_Desc_t TxCtrlEPList[NBR_OF_EPIDS] __attribute__ ((aligned (4))); +static volatile USB_EP_Desc_t TxBulkEPList[NBR_OF_EPIDS] __attribute__ ((aligned (4))); +/* After each enabled bulk EP (IN or OUT) we put two disabled EP descriptors with the eol flag set, + causing the DMA to stop the DMA channel. The first of these two has the intr flag set, which + gives us a dma8_sub0_descr interrupt. When we receive this, we advance the DMA one step in the + EP list and then restart the bulk channel, thus forcing a switch between bulk EP descriptors + in each frame. */ +static volatile USB_EP_Desc_t TxBulkDummyEPList[NBR_OF_EPIDS][2] __attribute__ ((aligned (4))); + +static volatile USB_EP_Desc_t TxIsocEPList[NBR_OF_EPIDS] __attribute__ ((aligned (4))); +static volatile USB_SB_Desc_t TxIsocSB_zout __attribute__ ((aligned (4))); + +static volatile USB_EP_Desc_t TxIntrEPList[MAX_INTR_INTERVAL] __attribute__ ((aligned (4))); +static volatile USB_SB_Desc_t TxIntrSB_zout __attribute__ ((aligned (4))); + +/* A zout transfer makes a memory access at the address of its buf pointer, which means that setting + this buf pointer to 0 will cause an access to the flash. In addition to this, setting sw_len to 0 + results in a 16/32 bytes (depending on DMA burst size) transfer. Instead, we set it to 1, and point + it to this buffer. */ +static int zout_buffer[4] __attribute__ ((aligned (4))); + +/* Cache for allocating new EP and SB descriptors. */ +static kmem_cache_t *usb_desc_cache; + +/* Cache for the registers allocated in the top half. */ +static kmem_cache_t *top_half_reg_cache; + +/* Cache for the data allocated in the isoc descr top half. */ +static kmem_cache_t *isoc_compl_cache; + +static struct usb_bus *etrax_usb_bus; + +/* This is a circular (double-linked) list of the active urbs for each epid. + The head is never removed, and new urbs are linked onto the list as + urb_entry_t elements. Don't reference urb_list directly; use the wrapper + functions instead. Note that working with these lists might require spinlock + protection. */ +static struct list_head urb_list[NBR_OF_EPIDS]; + +/* Read about the need and usage of this lock in submit_ctrl_urb. */ +static spinlock_t urb_list_lock; + +/* Used when unlinking asynchronously. */ +static struct list_head urb_unlink_list; + +/* for returning string descriptors in UTF-16LE */ +static int ascii2utf (char *ascii, __u8 *utf, int utfmax) +{ + int retval; + + for (retval = 0; *ascii && utfmax > 1; utfmax -= 2, retval += 2) { + *utf++ = *ascii++ & 0x7f; + *utf++ = 0; + } + return retval; +} + +static int usb_root_hub_string (int id, int serial, char *type, __u8 *data, int len) +{ + char buf [30]; + + // assert (len > (2 * (sizeof (buf) + 1))); + // assert (strlen (type) <= 8); + + // language ids + if (id == 0) { + *data++ = 4; *data++ = 3; /* 4 bytes data */ + *data++ = 0; *data++ = 0; /* some language id */ + return 4; + + // serial number + } else if (id == 1) { + sprintf (buf, "%x", serial); + + // product description + } else if (id == 2) { + sprintf (buf, "USB %s Root Hub", type); + + // id 3 == vendor description + + // unsupported IDs --> "stall" + } else + return 0; + + data [0] = 2 + ascii2utf (buf, data + 2, len - 2); + data [1] = 3; + return data [0]; +} + +/* Wrappers around the list functions (include/linux/list.h). */ + +static inline int urb_list_empty(int epid) +{ + return list_empty(&urb_list[epid]); +} + +/* Returns first urb for this epid, or NULL if list is empty. */ +static inline struct urb *urb_list_first(int epid) +{ + struct urb *first_urb = 0; + + if (!urb_list_empty(epid)) { + /* Get the first urb (i.e. head->next). */ + urb_entry_t *urb_entry = list_entry((&urb_list[epid])->next, urb_entry_t, list); + first_urb = urb_entry->urb; + } + return first_urb; +} + +/* Adds an urb_entry last in the list for this epid. */ +static inline void urb_list_add(struct urb *urb, int epid) +{ + urb_entry_t *urb_entry = (urb_entry_t *)kmalloc(sizeof(urb_entry_t), KMALLOC_FLAG); + assert(urb_entry); + + urb_entry->urb = urb; + list_add_tail(&urb_entry->list, &urb_list[epid]); +} + +/* Search through the list for an element that contains this urb. (The list + is expected to be short and the one we are about to delete will often be + the first in the list.) */ +static inline urb_entry_t *__urb_list_entry(struct urb *urb, int epid) +{ + struct list_head *entry; + struct list_head *tmp; + urb_entry_t *urb_entry; + + list_for_each_safe(entry, tmp, &urb_list[epid]) { + urb_entry = list_entry(entry, urb_entry_t, list); + assert(urb_entry); + assert(urb_entry->urb); + + if (urb_entry->urb == urb) { + return urb_entry; + } + } + return 0; +} + +/* Delete an urb from the list. */ +static inline void urb_list_del(struct urb *urb, int epid) +{ + urb_entry_t *urb_entry = __urb_list_entry(urb, epid); + assert(urb_entry); + + /* Delete entry and free. */ + list_del(&urb_entry->list); + kfree(urb_entry); +} + +/* Move an urb to the end of the list. */ +static inline void urb_list_move_last(struct urb *urb, int epid) +{ + urb_entry_t *urb_entry = __urb_list_entry(urb, epid); + assert(urb_entry); + + list_del(&urb_entry->list); + list_add_tail(&urb_entry->list, &urb_list[epid]); +} + +/* Get the next urb in the list. */ +static inline struct urb *urb_list_next(struct urb *urb, int epid) +{ + urb_entry_t *urb_entry = __urb_list_entry(urb, epid); + + assert(urb_entry); + + if (urb_entry->list.next != &urb_list[epid]) { + struct list_head *elem = urb_entry->list.next; + urb_entry = list_entry(elem, urb_entry_t, list); + return urb_entry->urb; + } else { + return NULL; + } +} + + + +/* For debug purposes only. */ +static inline void urb_list_dump(int epid) +{ + struct list_head *entry; + struct list_head *tmp; + urb_entry_t *urb_entry; + int i = 0; + + info("Dumping urb list for epid %d", epid); + + list_for_each_safe(entry, tmp, &urb_list[epid]) { + urb_entry = list_entry(entry, urb_entry_t, list); + info(" entry %d, urb = 0x%lx", i, (unsigned long)urb_entry->urb); + } +} + +static void init_rx_buffers(void); +static int etrax_rh_unlink_urb(struct urb *urb); +static void etrax_rh_send_irq(struct urb *urb); +static void etrax_rh_init_int_timer(struct urb *urb); +static void etrax_rh_int_timer_do(unsigned long ptr); + +static int etrax_usb_setup_epid(struct urb *urb); +static int etrax_usb_lookup_epid(struct urb *urb); +static int etrax_usb_allocate_epid(void); +static void etrax_usb_free_epid(int epid); + +static int etrax_remove_from_sb_list(struct urb *urb); + +static void* etrax_usb_buffer_alloc(struct usb_bus* bus, size_t size, int mem_flags, dma_addr_t *dma); +static void etrax_usb_buffer_free(struct usb_bus *bus, size_t size, void *addr, dma_addr_t dma); + +static void etrax_usb_add_to_bulk_sb_list(struct urb *urb, int epid); +static void etrax_usb_add_to_ctrl_sb_list(struct urb *urb, int epid); +static void etrax_usb_add_to_intr_sb_list(struct urb *urb, int epid); +static void etrax_usb_add_to_isoc_sb_list(struct urb *urb, int epid); + +static int etrax_usb_submit_bulk_urb(struct urb *urb); +static int etrax_usb_submit_ctrl_urb(struct urb *urb); +static int etrax_usb_submit_intr_urb(struct urb *urb); +static int etrax_usb_submit_isoc_urb(struct urb *urb); + +static int etrax_usb_submit_urb(struct urb *urb, int mem_flags); +static int etrax_usb_unlink_urb(struct urb *urb, int status); +static int etrax_usb_get_frame_number(struct usb_device *usb_dev); + +static irqreturn_t etrax_usb_tx_interrupt(int irq, void *vhc, struct pt_regs *regs); +static irqreturn_t etrax_usb_rx_interrupt(int irq, void *vhc, struct pt_regs *regs); +static irqreturn_t etrax_usb_hc_interrupt_top_half(int irq, void *vhc, struct pt_regs *regs); +static void etrax_usb_hc_interrupt_bottom_half(void *data); + +static void etrax_usb_isoc_descr_interrupt_bottom_half(void *data); + + +/* The following is a list of interrupt handlers for the host controller interrupts we use. + They are called from etrax_usb_hc_interrupt_bottom_half. */ +static void etrax_usb_hc_isoc_eof_interrupt(void); +static void etrax_usb_hc_bulk_eot_interrupt(int timer_induced); +static void etrax_usb_hc_epid_attn_interrupt(usb_interrupt_registers_t *reg); +static void etrax_usb_hc_port_status_interrupt(usb_interrupt_registers_t *reg); +static void etrax_usb_hc_ctl_status_interrupt(usb_interrupt_registers_t *reg); + +static int etrax_rh_submit_urb (struct urb *urb); + +/* Forward declaration needed because they are used in the rx interrupt routine. */ +static void etrax_usb_complete_urb(struct urb *urb, int status); +static void etrax_usb_complete_bulk_urb(struct urb *urb, int status); +static void etrax_usb_complete_ctrl_urb(struct urb *urb, int status); +static void etrax_usb_complete_intr_urb(struct urb *urb, int status); +static void etrax_usb_complete_isoc_urb(struct urb *urb, int status); + +static int etrax_usb_hc_init(void); +static void etrax_usb_hc_cleanup(void); + +static struct usb_operations etrax_usb_device_operations = +{ + .get_frame_number = etrax_usb_get_frame_number, + .submit_urb = etrax_usb_submit_urb, + .unlink_urb = etrax_usb_unlink_urb, + .buffer_alloc = etrax_usb_buffer_alloc, + .buffer_free = etrax_usb_buffer_free +}; + +/* Note that these functions are always available in their "__" variants, for use in + error situations. The "__" missing variants are controlled by the USB_DEBUG_DESC/ + USB_DEBUG_URB macros. */ +static void __dump_urb(struct urb* purb) +{ + printk("\nurb :0x%08lx\n", (unsigned long)purb); + printk("dev :0x%08lx\n", (unsigned long)purb->dev); + printk("pipe :0x%08x\n", purb->pipe); + printk("status :%d\n", purb->status); + printk("transfer_flags :0x%08x\n", purb->transfer_flags); + printk("transfer_buffer :0x%08lx\n", (unsigned long)purb->transfer_buffer); + printk("transfer_buffer_length:%d\n", purb->transfer_buffer_length); + printk("actual_length :%d\n", purb->actual_length); + printk("setup_packet :0x%08lx\n", (unsigned long)purb->setup_packet); + printk("start_frame :%d\n", purb->start_frame); + printk("number_of_packets :%d\n", purb->number_of_packets); + printk("interval :%d\n", purb->interval); + printk("error_count :%d\n", purb->error_count); + printk("context :0x%08lx\n", (unsigned long)purb->context); + printk("complete :0x%08lx\n\n", (unsigned long)purb->complete); +} + +static void __dump_in_desc(volatile USB_IN_Desc_t *in) +{ + printk("\nUSB_IN_Desc at 0x%08lx\n", (unsigned long)in); + printk(" sw_len : 0x%04x (%d)\n", in->sw_len, in->sw_len); + printk(" command : 0x%04x\n", in->command); + printk(" next : 0x%08lx\n", in->next); + printk(" buf : 0x%08lx\n", in->buf); + printk(" hw_len : 0x%04x (%d)\n", in->hw_len, in->hw_len); + printk(" status : 0x%04x\n\n", in->status); +} + +static void __dump_sb_desc(volatile USB_SB_Desc_t *sb) +{ + char tt = (sb->command & 0x30) >> 4; + char *tt_string; + + switch (tt) { + case 0: + tt_string = "zout"; + break; + case 1: + tt_string = "in"; + break; + case 2: + tt_string = "out"; + break; + case 3: + tt_string = "setup"; + break; + default: + tt_string = "unknown (weird)"; + } + + printk("\n USB_SB_Desc at 0x%08lx\n", (unsigned long)sb); + printk(" command : 0x%04x\n", sb->command); + printk(" rem : %d\n", (sb->command & 0x3f00) >> 8); + printk(" full : %d\n", (sb->command & 0x40) >> 6); + printk(" tt : %d (%s)\n", tt, tt_string); + printk(" intr : %d\n", (sb->command & 0x8) >> 3); + printk(" eot : %d\n", (sb->command & 0x2) >> 1); + printk(" eol : %d\n", sb->command & 0x1); + printk(" sw_len : 0x%04x (%d)\n", sb->sw_len, sb->sw_len); + printk(" next : 0x%08lx\n", sb->next); + printk(" buf : 0x%08lx\n\n", sb->buf); +} + + +static void __dump_ep_desc(volatile USB_EP_Desc_t *ep) +{ + printk("\nUSB_EP_Desc at 0x%08lx\n", (unsigned long)ep); + printk(" command : 0x%04x\n", ep->command); + printk(" ep_id : %d\n", (ep->command & 0x1f00) >> 8); + printk(" enable : %d\n", (ep->command & 0x10) >> 4); + printk(" intr : %d\n", (ep->command & 0x8) >> 3); + printk(" eof : %d\n", (ep->command & 0x2) >> 1); + printk(" eol : %d\n", ep->command & 0x1); + printk(" hw_len : 0x%04x (%d)\n", ep->hw_len, ep->hw_len); + printk(" next : 0x%08lx\n", ep->next); + printk(" sub : 0x%08lx\n\n", ep->sub); +} + +static inline void __dump_ep_list(int pipe_type) +{ + volatile USB_EP_Desc_t *ep; + volatile USB_EP_Desc_t *first_ep; + volatile USB_SB_Desc_t *sb; + + switch (pipe_type) + { + case PIPE_BULK: + first_ep = &TxBulkEPList[0]; + break; + case PIPE_CONTROL: + first_ep = &TxCtrlEPList[0]; + break; + case PIPE_INTERRUPT: + first_ep = &TxIntrEPList[0]; + break; + case PIPE_ISOCHRONOUS: + first_ep = &TxIsocEPList[0]; + break; + default: + warn("Cannot dump unknown traffic type"); + return; + } + ep = first_ep; + + printk("\n\nDumping EP list...\n\n"); + + do { + __dump_ep_desc(ep); + /* Cannot phys_to_virt on 0 as it turns into 80000000, which is != 0. */ + sb = ep->sub ? phys_to_virt(ep->sub) : 0; + while (sb) { + __dump_sb_desc(sb); + sb = sb->next ? phys_to_virt(sb->next) : 0; + } + ep = (volatile USB_EP_Desc_t *)(phys_to_virt(ep->next)); + + } while (ep != first_ep); +} + +static inline void __dump_ept_data(int epid) +{ + unsigned long flags; + __u32 r_usb_ept_data; + + if (epid < 0 || epid > 31) { + printk("Cannot dump ept data for invalid epid %d\n", epid); + return; + } + + save_flags(flags); + cli(); + *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid); + nop(); + r_usb_ept_data = *R_USB_EPT_DATA; + restore_flags(flags); + + printk("\nR_USB_EPT_DATA = 0x%x for epid %d :\n", r_usb_ept_data, epid); + if (r_usb_ept_data == 0) { + /* No need for more detailed printing. */ + return; + } + printk(" valid : %d\n", (r_usb_ept_data & 0x80000000) >> 31); + printk(" hold : %d\n", (r_usb_ept_data & 0x40000000) >> 30); + printk(" error_count_in : %d\n", (r_usb_ept_data & 0x30000000) >> 28); + printk(" t_in : %d\n", (r_usb_ept_data & 0x08000000) >> 27); + printk(" low_speed : %d\n", (r_usb_ept_data & 0x04000000) >> 26); + printk(" port : %d\n", (r_usb_ept_data & 0x03000000) >> 24); + printk(" error_code : %d\n", (r_usb_ept_data & 0x00c00000) >> 22); + printk(" t_out : %d\n", (r_usb_ept_data & 0x00200000) >> 21); + printk(" error_count_out : %d\n", (r_usb_ept_data & 0x00180000) >> 19); + printk(" max_len : %d\n", (r_usb_ept_data & 0x0003f800) >> 11); + printk(" ep : %d\n", (r_usb_ept_data & 0x00000780) >> 7); + printk(" dev : %d\n", (r_usb_ept_data & 0x0000003f)); +} + +static inline void __dump_ept_data_list(void) +{ + int i; + + printk("Dumping the whole R_USB_EPT_DATA list\n"); + + for (i = 0; i < 32; i++) { + __dump_ept_data(i); + } +} +#ifdef USB_DEBUG_DESC +#define dump_in_desc(...) __dump_in_desc(...) +#define dump_sb_desc(...) __dump_sb_desc(...) +#define dump_ep_desc(...) __dump_ep_desc(...) +#else +#define dump_in_desc(...) do {} while (0) +#define dump_sb_desc(...) do {} while (0) +#define dump_ep_desc(...) do {} while (0) +#endif + +#ifdef USB_DEBUG_URB +#define dump_urb(x) __dump_urb(x) +#else +#define dump_urb(x) do {} while (0) +#endif + +static void init_rx_buffers(void) +{ + int i; + + DBFENTER; + + for (i = 0; i < (NBR_OF_RX_DESC - 1); i++) { + RxDescList[i].sw_len = RX_DESC_BUF_SIZE; + RxDescList[i].command = 0; + RxDescList[i].next = virt_to_phys(&RxDescList[i + 1]); + RxDescList[i].buf = virt_to_phys(RxBuf + (i * RX_DESC_BUF_SIZE)); + RxDescList[i].hw_len = 0; + RxDescList[i].status = 0; + + /* DMA IN cache bug. (struct etrax_dma_descr has the same layout as USB_IN_Desc + for the relevant fields.) */ + prepare_rx_descriptor((struct etrax_dma_descr*)&RxDescList[i]); + + } + + RxDescList[i].sw_len = RX_DESC_BUF_SIZE; + RxDescList[i].command = IO_STATE(USB_IN_command, eol, yes); + RxDescList[i].next = virt_to_phys(&RxDescList[0]); + RxDescList[i].buf = virt_to_phys(RxBuf + (i * RX_DESC_BUF_SIZE)); + RxDescList[i].hw_len = 0; + RxDescList[i].status = 0; + + myNextRxDesc = &RxDescList[0]; + myLastRxDesc = &RxDescList[NBR_OF_RX_DESC - 1]; + myPrevRxDesc = &RxDescList[NBR_OF_RX_DESC - 1]; + + *R_DMA_CH9_FIRST = virt_to_phys(myNextRxDesc); + *R_DMA_CH9_CMD = IO_STATE(R_DMA_CH9_CMD, cmd, start); + + DBFEXIT; +} + +static void init_tx_bulk_ep(void) +{ + int i; + + DBFENTER; + + for (i = 0; i < (NBR_OF_EPIDS - 1); i++) { + CHECK_ALIGN(&TxBulkEPList[i]); + TxBulkEPList[i].hw_len = 0; + TxBulkEPList[i].command = IO_FIELD(USB_EP_command, epid, i); + TxBulkEPList[i].sub = 0; + TxBulkEPList[i].next = virt_to_phys(&TxBulkEPList[i + 1]); + + /* Initiate two EPs, disabled and with the eol flag set. No need for any + preserved epid. */ + + /* The first one has the intr flag set so we get an interrupt when the DMA + channel is about to become disabled. */ + CHECK_ALIGN(&TxBulkDummyEPList[i][0]); + TxBulkDummyEPList[i][0].hw_len = 0; + TxBulkDummyEPList[i][0].command = (IO_FIELD(USB_EP_command, epid, DUMMY_EPID) | + IO_STATE(USB_EP_command, eol, yes) | + IO_STATE(USB_EP_command, intr, yes)); + TxBulkDummyEPList[i][0].sub = 0; + TxBulkDummyEPList[i][0].next = virt_to_phys(&TxBulkDummyEPList[i][1]); + + /* The second one. */ + CHECK_ALIGN(&TxBulkDummyEPList[i][1]); + TxBulkDummyEPList[i][1].hw_len = 0; + TxBulkDummyEPList[i][1].command = (IO_FIELD(USB_EP_command, epid, DUMMY_EPID) | + IO_STATE(USB_EP_command, eol, yes)); + TxBulkDummyEPList[i][1].sub = 0; + /* The last dummy's next pointer is the same as the current EP's next pointer. */ + TxBulkDummyEPList[i][1].next = virt_to_phys(&TxBulkEPList[i + 1]); + } + + /* Configure the last one. */ + CHECK_ALIGN(&TxBulkEPList[i]); + TxBulkEPList[i].hw_len = 0; + TxBulkEPList[i].command = (IO_STATE(USB_EP_command, eol, yes) | + IO_FIELD(USB_EP_command, epid, i)); + TxBulkEPList[i].sub = 0; + TxBulkEPList[i].next = virt_to_phys(&TxBulkEPList[0]); + + /* No need configuring dummy EPs for the last one as it will never be used for + bulk traffic (i == INVALD_EPID at this point). */ + + /* Set up to start on the last EP so we will enable it when inserting traffic + for the first time (imitating the situation where the DMA has stopped + because there was no more traffic). */ + *R_DMA_CH8_SUB0_EP = virt_to_phys(&TxBulkEPList[i]); + /* No point in starting the bulk channel yet. + *R_DMA_CH8_SUB0_CMD = IO_STATE(R_DMA_CH8_SUB0_CMD, cmd, start); */ + DBFEXIT; +} + +static void init_tx_ctrl_ep(void) +{ + int i; + + DBFENTER; + + for (i = 0; i < (NBR_OF_EPIDS - 1); i++) { + CHECK_ALIGN(&TxCtrlEPList[i]); + TxCtrlEPList[i].hw_len = 0; + TxCtrlEPList[i].command = IO_FIELD(USB_EP_command, epid, i); + TxCtrlEPList[i].sub = 0; + TxCtrlEPList[i].next = virt_to_phys(&TxCtrlEPList[i + 1]); + } + + CHECK_ALIGN(&TxCtrlEPList[i]); + TxCtrlEPList[i].hw_len = 0; + TxCtrlEPList[i].command = (IO_STATE(USB_EP_command, eol, yes) | + IO_FIELD(USB_EP_command, epid, i)); + + TxCtrlEPList[i].sub = 0; + TxCtrlEPList[i].next = virt_to_phys(&TxCtrlEPList[0]); + + *R_DMA_CH8_SUB1_EP = virt_to_phys(&TxCtrlEPList[0]); + *R_DMA_CH8_SUB1_CMD = IO_STATE(R_DMA_CH8_SUB1_CMD, cmd, start); + + DBFEXIT; +} + + +static void init_tx_intr_ep(void) +{ + int i; + + DBFENTER; + + /* Read comment at zout_buffer declaration for an explanation to this. */ + TxIntrSB_zout.sw_len = 1; + TxIntrSB_zout.next = 0; + TxIntrSB_zout.buf = virt_to_phys(&zout_buffer[0]); + TxIntrSB_zout.command = (IO_FIELD(USB_SB_command, rem, 0) | + IO_STATE(USB_SB_command, tt, zout) | + IO_STATE(USB_SB_command, full, yes) | + IO_STATE(USB_SB_command, eot, yes) | + IO_STATE(USB_SB_command, eol, yes)); + + for (i = 0; i < (MAX_INTR_INTERVAL - 1); i++) { + CHECK_ALIGN(&TxIntrEPList[i]); + TxIntrEPList[i].hw_len = 0; + TxIntrEPList[i].command = + (IO_STATE(USB_EP_command, eof, yes) | + IO_STATE(USB_EP_command, enable, yes) | + IO_FIELD(USB_EP_command, epid, INVALID_EPID)); + TxIntrEPList[i].sub = virt_to_phys(&TxIntrSB_zout); + TxIntrEPList[i].next = virt_to_phys(&TxIntrEPList[i + 1]); + } + + CHECK_ALIGN(&TxIntrEPList[i]); + TxIntrEPList[i].hw_len = 0; + TxIntrEPList[i].command = + (IO_STATE(USB_EP_command, eof, yes) | + IO_STATE(USB_EP_command, eol, yes) | + IO_STATE(USB_EP_command, enable, yes) | + IO_FIELD(USB_EP_command, epid, INVALID_EPID)); + TxIntrEPList[i].sub = virt_to_phys(&TxIntrSB_zout); + TxIntrEPList[i].next = virt_to_phys(&TxIntrEPList[0]); + + *R_DMA_CH8_SUB2_EP = virt_to_phys(&TxIntrEPList[0]); + *R_DMA_CH8_SUB2_CMD = IO_STATE(R_DMA_CH8_SUB2_CMD, cmd, start); + DBFEXIT; +} + +static void init_tx_isoc_ep(void) +{ + int i; + + DBFENTER; + + /* Read comment at zout_buffer declaration for an explanation to this. */ + TxIsocSB_zout.sw_len = 1; + TxIsocSB_zout.next = 0; + TxIsocSB_zout.buf = virt_to_phys(&zout_buffer[0]); + TxIsocSB_zout.command = (IO_FIELD(USB_SB_command, rem, 0) | + IO_STATE(USB_SB_command, tt, zout) | + IO_STATE(USB_SB_command, full, yes) | + IO_STATE(USB_SB_command, eot, yes) | + IO_STATE(USB_SB_command, eol, yes)); + + /* The last isochronous EP descriptor is a dummy. */ + + for (i = 0; i < (NBR_OF_EPIDS - 1); i++) { + CHECK_ALIGN(&TxIsocEPList[i]); + TxIsocEPList[i].hw_len = 0; + TxIsocEPList[i].command = IO_FIELD(USB_EP_command, epid, i); + TxIsocEPList[i].sub = 0; + TxIsocEPList[i].next = virt_to_phys(&TxIsocEPList[i + 1]); + } + + CHECK_ALIGN(&TxIsocEPList[i]); + TxIsocEPList[i].hw_len = 0; + + /* Must enable the last EP descr to get eof interrupt. */ + TxIsocEPList[i].command = (IO_STATE(USB_EP_command, enable, yes) | + IO_STATE(USB_EP_command, eof, yes) | + IO_STATE(USB_EP_command, eol, yes) | + IO_FIELD(USB_EP_command, epid, INVALID_EPID)); + TxIsocEPList[i].sub = virt_to_phys(&TxIsocSB_zout); + TxIsocEPList[i].next = virt_to_phys(&TxIsocEPList[0]); + + *R_DMA_CH8_SUB3_EP = virt_to_phys(&TxIsocEPList[0]); + *R_DMA_CH8_SUB3_CMD = IO_STATE(R_DMA_CH8_SUB3_CMD, cmd, start); + + DBFEXIT; +} + +static void etrax_usb_unlink_intr_urb(struct urb *urb) +{ + volatile USB_EP_Desc_t *first_ep; /* First EP in the list. */ + volatile USB_EP_Desc_t *curr_ep; /* Current EP, the iterator. */ + volatile USB_EP_Desc_t *next_ep; /* The EP after current. */ + volatile USB_EP_Desc_t *unlink_ep; /* The one we should remove from the list. */ + + int epid; + + /* Read 8.8.4 in Designer's Reference, "Removing an EP Descriptor from the List". */ + + DBFENTER; + + epid = ((etrax_urb_priv_t *)urb->hcpriv)->epid; + + first_ep = &TxIntrEPList[0]; + curr_ep = first_ep; + + + /* Note that this loop removes all EP descriptors with this epid. This assumes + that all EP descriptors belong to the one and only urb for this epid. */ + + do { + next_ep = (USB_EP_Desc_t *)phys_to_virt(curr_ep->next); + + if (IO_EXTRACT(USB_EP_command, epid, next_ep->command) == epid) { + + dbg_intr("Found EP to unlink for epid %d", epid); + + /* This is the one we should unlink. */ + unlink_ep = next_ep; + + /* Actually unlink the EP from the DMA list. */ + curr_ep->next = unlink_ep->next; + + /* Wait until the DMA is no longer at this descriptor. */ + while (*R_DMA_CH8_SUB2_EP == virt_to_phys(unlink_ep)); + + /* Now we are free to remove it and its SB descriptor. + Note that it is assumed here that there is only one sb in the + sb list for this ep. */ + kmem_cache_free(usb_desc_cache, phys_to_virt(unlink_ep->sub)); + kmem_cache_free(usb_desc_cache, (USB_EP_Desc_t *)unlink_ep); + } + + curr_ep = phys_to_virt(curr_ep->next); + + } while (curr_ep != first_ep); + urb->hcpriv = NULL; +} + +void etrax_usb_do_intr_recover(int epid) +{ + USB_EP_Desc_t *first_ep, *tmp_ep; + + DBFENTER; + + first_ep = (USB_EP_Desc_t *)phys_to_virt(*R_DMA_CH8_SUB2_EP); + tmp_ep = first_ep; + + /* What this does is simply to walk the list of interrupt + ep descriptors and enable those that are disabled. */ + + do { + if (IO_EXTRACT(USB_EP_command, epid, tmp_ep->command) == epid && + !(tmp_ep->command & IO_MASK(USB_EP_command, enable))) { + tmp_ep->command |= IO_STATE(USB_EP_command, enable, yes); + } + + tmp_ep = (USB_EP_Desc_t *)phys_to_virt(tmp_ep->next); + + } while (tmp_ep != first_ep); + + + DBFEXIT; +} + +static int etrax_rh_unlink_urb (struct urb *urb) +{ + etrax_hc_t *hc; + + DBFENTER; + + hc = urb->dev->bus->hcpriv; + + if (hc->rh.urb == urb) { + hc->rh.send = 0; + del_timer(&hc->rh.rh_int_timer); + } + + DBFEXIT; + return 0; +} + +static void etrax_rh_send_irq(struct urb *urb) +{ + __u16 data = 0; + etrax_hc_t *hc = urb->dev->bus->hcpriv; + DBFENTER; + +/* + dbg_rh("R_USB_FM_NUMBER : 0x%08X", *R_USB_FM_NUMBER); + dbg_rh("R_USB_FM_REMAINING: 0x%08X", *R_USB_FM_REMAINING); +*/ + + data |= (hc->rh.wPortChange_1) ? (1 << 1) : 0; + data |= (hc->rh.wPortChange_2) ? (1 << 2) : 0; + + *((__u16 *)urb->transfer_buffer) = cpu_to_le16(data); + /* FIXME: Why is actual_length set to 1 when data is 2 bytes? + Since only 1 byte is used, why not declare data as __u8? */ + urb->actual_length = 1; + urb->status = 0; + + if (hc->rh.send && urb->complete) { + dbg_rh("wPortChange_1: 0x%04X", hc->rh.wPortChange_1); + dbg_rh("wPortChange_2: 0x%04X", hc->rh.wPortChange_2); + + urb->complete(urb, NULL); + } + + DBFEXIT; +} + +static void etrax_rh_init_int_timer(struct urb *urb) +{ + etrax_hc_t *hc; + + DBFENTER; + + hc = urb->dev->bus->hcpriv; + hc->rh.interval = urb->interval; + init_timer(&hc->rh.rh_int_timer); + hc->rh.rh_int_timer.function = etrax_rh_int_timer_do; + hc->rh.rh_int_timer.data = (unsigned long)urb; + /* FIXME: Is the jiffies resolution enough? All intervals < 10 ms will be mapped + to 0, and the rest to the nearest lower 10 ms. */ + hc->rh.rh_int_timer.expires = jiffies + ((HZ * hc->rh.interval) / 1000); + add_timer(&hc->rh.rh_int_timer); + + DBFEXIT; +} + +static void etrax_rh_int_timer_do(unsigned long ptr) +{ + struct urb *urb; + etrax_hc_t *hc; + + DBFENTER; + + urb = (struct urb*)ptr; + hc = urb->dev->bus->hcpriv; + + if (hc->rh.send) { + etrax_rh_send_irq(urb); + } + + DBFEXIT; +} + +static int etrax_usb_setup_epid(struct urb *urb) +{ + int epid; + char devnum, endpoint, out_traffic, slow; + int maxlen; + unsigned long flags; + + DBFENTER; + + epid = etrax_usb_lookup_epid(urb); + if ((epid != -1)){ + /* An epid that fits this urb has been found. */ + DBFEXIT; + return epid; + } + + /* We must find and initiate a new epid for this urb. */ + epid = etrax_usb_allocate_epid(); + + if (epid == -1) { + /* Failed to allocate a new epid. */ + DBFEXIT; + return epid; + } + + /* We now have a new epid to use. Initiate it. */ + set_bit(epid, (void *)&epid_usage_bitmask); + + devnum = usb_pipedevice(urb->pipe); + endpoint = usb_pipeendpoint(urb->pipe); + slow = usb_pipeslow(urb->pipe); + maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)); + if (usb_pipetype(urb->pipe) == PIPE_CONTROL) { + /* We want both IN and OUT control traffic to be put on the same EP/SB list. */ + out_traffic = 1; + } else { + out_traffic = usb_pipeout(urb->pipe); + } + + save_flags(flags); + cli(); + + *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid); + nop(); + + if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { + *R_USB_EPT_DATA_ISO = IO_STATE(R_USB_EPT_DATA_ISO, valid, yes) | + /* FIXME: Change any to the actual port? */ + IO_STATE(R_USB_EPT_DATA_ISO, port, any) | + IO_FIELD(R_USB_EPT_DATA_ISO, max_len, maxlen) | + IO_FIELD(R_USB_EPT_DATA_ISO, ep, endpoint) | + IO_FIELD(R_USB_EPT_DATA_ISO, dev, devnum); + } else { + *R_USB_EPT_DATA = IO_STATE(R_USB_EPT_DATA, valid, yes) | + IO_FIELD(R_USB_EPT_DATA, low_speed, slow) | + /* FIXME: Change any to the actual port? */ + IO_STATE(R_USB_EPT_DATA, port, any) | + IO_FIELD(R_USB_EPT_DATA, max_len, maxlen) | + IO_FIELD(R_USB_EPT_DATA, ep, endpoint) | + IO_FIELD(R_USB_EPT_DATA, dev, devnum); + } + + restore_flags(flags); + + if (out_traffic) { + set_bit(epid, (void *)&epid_out_traffic); + } else { + clear_bit(epid, (void *)&epid_out_traffic); + } + + dbg_epid("Setting up epid %d with devnum %d, endpoint %d and max_len %d (%s)", + epid, devnum, endpoint, maxlen, out_traffic ? "OUT" : "IN"); + + DBFEXIT; + return epid; +} + +static void etrax_usb_free_epid(int epid) +{ + unsigned long flags; + + DBFENTER; + + if (!test_bit(epid, (void *)&epid_usage_bitmask)) { + warn("Trying to free unused epid %d", epid); + DBFEXIT; + return; + } + + save_flags(flags); + cli(); + + *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid); + nop(); + while (*R_USB_EPT_DATA & IO_MASK(R_USB_EPT_DATA, hold)); + /* This will, among other things, set the valid field to 0. */ + *R_USB_EPT_DATA = 0; + restore_flags(flags); + + clear_bit(epid, (void *)&epid_usage_bitmask); + + + dbg_epid("Freed epid %d", epid); + + DBFEXIT; +} + +static int etrax_usb_lookup_epid(struct urb *urb) +{ + int i; + __u32 data; + char devnum, endpoint, slow, out_traffic; + int maxlen; + unsigned long flags; + + DBFENTER; + + devnum = usb_pipedevice(urb->pipe); + endpoint = usb_pipeendpoint(urb->pipe); + slow = usb_pipeslow(urb->pipe); + maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)); + if (usb_pipetype(urb->pipe) == PIPE_CONTROL) { + /* We want both IN and OUT control traffic to be put on the same EP/SB list. */ + out_traffic = 1; + } else { + out_traffic = usb_pipeout(urb->pipe); + } + + /* Step through att epids. */ + for (i = 0; i < NBR_OF_EPIDS; i++) { + if (test_bit(i, (void *)&epid_usage_bitmask) && + test_bit(i, (void *)&epid_out_traffic) == out_traffic) { + + save_flags(flags); + cli(); + *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, i); + nop(); + + if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { + data = *R_USB_EPT_DATA_ISO; + restore_flags(flags); + + if ((IO_MASK(R_USB_EPT_DATA_ISO, valid) & data) && + (IO_EXTRACT(R_USB_EPT_DATA_ISO, dev, data) == devnum) && + (IO_EXTRACT(R_USB_EPT_DATA_ISO, ep, data) == endpoint) && + (IO_EXTRACT(R_USB_EPT_DATA_ISO, max_len, data) == maxlen)) { + dbg_epid("Found epid %d for devnum %d, endpoint %d (%s)", + i, devnum, endpoint, out_traffic ? "OUT" : "IN"); + DBFEXIT; + return i; + } + } else { + data = *R_USB_EPT_DATA; + restore_flags(flags); + + if ((IO_MASK(R_USB_EPT_DATA, valid) & data) && + (IO_EXTRACT(R_USB_EPT_DATA, dev, data) == devnum) && + (IO_EXTRACT(R_USB_EPT_DATA, ep, data) == endpoint) && + (IO_EXTRACT(R_USB_EPT_DATA, low_speed, data) == slow) && + (IO_EXTRACT(R_USB_EPT_DATA, max_len, data) == maxlen)) { + dbg_epid("Found epid %d for devnum %d, endpoint %d (%s)", + i, devnum, endpoint, out_traffic ? "OUT" : "IN"); + DBFEXIT; + return i; + } + } + } + } + + DBFEXIT; + return -1; +} + +static int etrax_usb_allocate_epid(void) +{ + int i; + + DBFENTER; + + for (i = 0; i < NBR_OF_EPIDS; i++) { + if (!test_bit(i, (void *)&epid_usage_bitmask)) { + dbg_epid("Found free epid %d", i); + DBFEXIT; + return i; + } + } + + dbg_epid("Found no free epids"); + DBFEXIT; + return -1; +} + +static int etrax_usb_submit_urb(struct urb *urb, int mem_flags) +{ + etrax_hc_t *hc; + int ret = -EINVAL; + + DBFENTER; + + if (!urb->dev || !urb->dev->bus) { + return -ENODEV; + } + if (usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)) <= 0) { + info("Submit urb to pipe with maxpacketlen 0, pipe 0x%X\n", urb->pipe); + return -EMSGSIZE; + } + + if (urb->timeout) { + /* FIXME. */ + warn("urb->timeout specified, ignoring."); + } + + hc = (etrax_hc_t*)urb->dev->bus->hcpriv; + + if (usb_pipedevice(urb->pipe) == hc->rh.devnum) { + /* This request is for the Virtual Root Hub. */ + ret = etrax_rh_submit_urb(urb); + + } else if (usb_pipetype(urb->pipe) == PIPE_BULK) { + + ret = etrax_usb_submit_bulk_urb(urb); + + } else if (usb_pipetype(urb->pipe) == PIPE_CONTROL) { + + ret = etrax_usb_submit_ctrl_urb(urb); + + } else if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT) { + int bustime; + + if (urb->bandwidth == 0) { + bustime = usb_check_bandwidth(urb->dev, urb); + if (bustime < 0) { + ret = bustime; + } else { + ret = etrax_usb_submit_intr_urb(urb); + if (ret == 0) + usb_claim_bandwidth(urb->dev, urb, bustime, 0); + } + } else { + /* Bandwidth already set. */ + ret = etrax_usb_submit_intr_urb(urb); + } + + } else if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { + int bustime; + + if (urb->bandwidth == 0) { + bustime = usb_check_bandwidth(urb->dev, urb); + if (bustime < 0) { + ret = bustime; + } else { + ret = etrax_usb_submit_isoc_urb(urb); + if (ret == 0) + usb_claim_bandwidth(urb->dev, urb, bustime, 0); + } + } else { + /* Bandwidth already set. */ + ret = etrax_usb_submit_isoc_urb(urb); + } + } + + DBFEXIT; + + if (ret != 0) + printk("Submit URB error %d\n", ret); + + return ret; +} + +static int etrax_usb_unlink_urb(struct urb *urb, int status) +{ + etrax_hc_t *hc; + etrax_urb_priv_t *urb_priv; + int epid; + unsigned int flags; + + DBFENTER; + + if (!urb) { + return -EINVAL; + } + + /* Disable interrupts here since a descriptor interrupt for the isoc epid + will modify the sb list. This could possibly be done more granular, but + unlink_urb should not be used frequently anyway. + */ + + save_flags(flags); + cli(); + + if (!urb->dev || !urb->dev->bus) { + restore_flags(flags); + return -ENODEV; + } + if (!urb->hcpriv) { + /* This happens if a device driver calls unlink on an urb that + was never submitted (lazy driver) or if the urb was completed + while unlink was being called. */ + restore_flags(flags); + return 0; + } + if (urb->transfer_flags & URB_ASYNC_UNLINK) { + /* FIXME. */ + /* If URB_ASYNC_UNLINK is set: + unlink + move to a separate urb list + call complete at next sof with ECONNRESET + + If not: + wait 1 ms + unlink + call complete with ENOENT + */ + warn("URB_ASYNC_UNLINK set, ignoring."); + } + + /* One might think that urb->status = -EINPROGRESS would be a requirement for unlinking, + but that doesn't work for interrupt and isochronous traffic since they are completed + repeatedly, and urb->status is set then. That may in itself be a bug though. */ + + hc = urb->dev->bus->hcpriv; + urb_priv = (etrax_urb_priv_t *)urb->hcpriv; + epid = urb_priv->epid; + + /* Set the urb status (synchronous unlink). */ + urb->status = -ENOENT; + urb_priv->urb_state = UNLINK; + + if (usb_pipedevice(urb->pipe) == hc->rh.devnum) { + int ret; + ret = etrax_rh_unlink_urb(urb); + DBFEXIT; + restore_flags(flags); + return ret; + + } else if (usb_pipetype(urb->pipe) == PIPE_BULK) { + + dbg_bulk("Unlink of bulk urb (0x%lx)", (unsigned long)urb); + + if (TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)) { + /* The EP was enabled, disable it and wait. */ + TxBulkEPList[epid].command &= ~IO_MASK(USB_EP_command, enable); + + /* Ah, the luxury of busy-wait. */ + while (*R_DMA_CH8_SUB0_EP == virt_to_phys(&TxBulkEPList[epid])); + } + /* Kicking dummy list out of the party. */ + TxBulkEPList[epid].next = virt_to_phys(&TxBulkEPList[(epid + 1) % NBR_OF_EPIDS]); + + } else if (usb_pipetype(urb->pipe) == PIPE_CONTROL) { + + dbg_ctrl("Unlink of ctrl urb (0x%lx)", (unsigned long)urb); + + if (TxCtrlEPList[epid].command & IO_MASK(USB_EP_command, enable)) { + /* The EP was enabled, disable it and wait. */ + TxCtrlEPList[epid].command &= ~IO_MASK(USB_EP_command, enable); + + /* Ah, the luxury of busy-wait. */ + while (*R_DMA_CH8_SUB1_EP == virt_to_phys(&TxCtrlEPList[epid])); + } + + } else if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT) { + + dbg_intr("Unlink of intr urb (0x%lx)", (unsigned long)urb); + + /* Separate function because it's a tad more complicated. */ + etrax_usb_unlink_intr_urb(urb); + + } else if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { + + dbg_isoc("Unlink of isoc urb (0x%lx)", (unsigned long)urb); + + if (TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable)) { + /* The EP was enabled, disable it and wait. */ + TxIsocEPList[epid].command &= ~IO_MASK(USB_EP_command, enable); + + /* Ah, the luxury of busy-wait. */ + while (*R_DMA_CH8_SUB3_EP == virt_to_phys(&TxIsocEPList[epid])); + } + } + + /* Note that we need to remove the urb from the urb list *before* removing its SB + descriptors. (This means that the isoc eof handler might get a null urb when we + are unlinking the last urb.) */ + + if (usb_pipetype(urb->pipe) == PIPE_BULK) { + + urb_list_del(urb, epid); + TxBulkEPList[epid].sub = 0; + etrax_remove_from_sb_list(urb); + + } else if (usb_pipetype(urb->pipe) == PIPE_CONTROL) { + + urb_list_del(urb, epid); + TxCtrlEPList[epid].sub = 0; + etrax_remove_from_sb_list(urb); + + } else if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT) { + + urb_list_del(urb, epid); + /* Sanity check (should never happen). */ + assert(urb_list_empty(epid)); + + /* Release allocated bandwidth. */ + usb_release_bandwidth(urb->dev, urb, 0); + + } else if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { + + if (usb_pipeout(urb->pipe)) { + + USB_SB_Desc_t *iter_sb, *prev_sb, *next_sb; + + if (__urb_list_entry(urb, epid)) { + + urb_list_del(urb, epid); + iter_sb = TxIsocEPList[epid].sub ? phys_to_virt(TxIsocEPList[epid].sub) : 0; + prev_sb = 0; + while (iter_sb && (iter_sb != urb_priv->first_sb)) { + prev_sb = iter_sb; + iter_sb = iter_sb->next ? phys_to_virt(iter_sb->next) : 0; + } + + if (iter_sb == 0) { + /* Unlink of the URB currently being transmitted. */ + prev_sb = 0; + iter_sb = TxIsocEPList[epid].sub ? phys_to_virt(TxIsocEPList[epid].sub) : 0; + } + + while (iter_sb && (iter_sb != urb_priv->last_sb)) { + iter_sb = iter_sb->next ? phys_to_virt(iter_sb->next) : 0; + } + if (iter_sb) { + next_sb = iter_sb->next ? phys_to_virt(iter_sb->next) : 0; + } else { + /* This should only happen if the DMA has completed + processing the SB list for this EP while interrupts + are disabled. */ + dbg_isoc("Isoc urb not found, already sent?"); + next_sb = 0; + } + if (prev_sb) { + prev_sb->next = next_sb ? virt_to_phys(next_sb) : 0; + } else { + TxIsocEPList[epid].sub = next_sb ? virt_to_phys(next_sb) : 0; + } + + etrax_remove_from_sb_list(urb); + if (urb_list_empty(epid)) { + TxIsocEPList[epid].sub = 0; + dbg_isoc("Last isoc out urb epid %d", epid); + } else if (next_sb || prev_sb) { + dbg_isoc("Re-enable isoc out epid %d", epid); + + TxIsocEPList[epid].hw_len = 0; + TxIsocEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes); + } else { + TxIsocEPList[epid].sub = 0; + dbg_isoc("URB list non-empty and no SB list, EP disabled"); + } + } else { + dbg_isoc("Urb 0x%p not found, completed already?", urb); + } + } else { + + urb_list_del(urb, epid); + + /* For in traffic there is only one SB descriptor for each EP even + though there may be several urbs (all urbs point at the same SB). */ + if (urb_list_empty(epid)) { + /* No more urbs, remove the SB. */ + TxIsocEPList[epid].sub = 0; + etrax_remove_from_sb_list(urb); + } else { + TxIsocEPList[epid].hw_len = 0; + TxIsocEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes); + } + } + /* Release allocated bandwidth. */ + usb_release_bandwidth(urb->dev, urb, 1); + } + /* Free the epid if urb list is empty. */ + if (urb_list_empty(epid)) { + etrax_usb_free_epid(epid); + } + restore_flags(flags); + + /* Must be done before calling completion handler. */ + kfree(urb_priv); + urb->hcpriv = 0; + + if (urb->complete) { + urb->complete(urb, NULL); + } + + DBFEXIT; + return 0; +} + +static int etrax_usb_get_frame_number(struct usb_device *usb_dev) +{ + DBFENTER; + DBFEXIT; + return (*R_USB_FM_NUMBER & 0x7ff); +} + +static irqreturn_t etrax_usb_tx_interrupt(int irq, void *vhc, struct pt_regs *regs) +{ + DBFENTER; + + /* This interrupt handler could be used when unlinking EP descriptors. */ + + if (*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma8_sub0_descr)) { + USB_EP_Desc_t *ep; + + //dbg_bulk("dma8_sub0_descr (BULK) intr."); + + /* It should be safe clearing the interrupt here, since we don't expect to get a new + one until we restart the bulk channel. */ + *R_DMA_CH8_SUB0_CLR_INTR = IO_STATE(R_DMA_CH8_SUB0_CLR_INTR, clr_descr, do); + + /* Wait while the DMA is running (though we don't expect it to be). */ + while (*R_DMA_CH8_SUB0_CMD & IO_MASK(R_DMA_CH8_SUB0_CMD, cmd)); + + /* Advance the DMA to the next EP descriptor. */ + ep = (USB_EP_Desc_t *)phys_to_virt(*R_DMA_CH8_SUB0_EP); + + //dbg_bulk("descr intr: DMA is at 0x%lx", (unsigned long)ep); + + /* ep->next is already a physical address; no need for a virt_to_phys. */ + *R_DMA_CH8_SUB0_EP = ep->next; + + /* Start the DMA bulk channel again. */ + *R_DMA_CH8_SUB0_CMD = IO_STATE(R_DMA_CH8_SUB0_CMD, cmd, start); + } + if (*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma8_sub1_descr)) { + struct urb *urb; + int epid; + etrax_urb_priv_t *urb_priv; + unsigned long int flags; + + dbg_ctrl("dma8_sub1_descr (CTRL) intr."); + *R_DMA_CH8_SUB1_CLR_INTR = IO_STATE(R_DMA_CH8_SUB1_CLR_INTR, clr_descr, do); + + /* The complete callback gets called so we cli. */ + save_flags(flags); + cli(); + + for (epid = 0; epid < NBR_OF_EPIDS - 1; epid++) { + if ((TxCtrlEPList[epid].sub == 0) || + (epid == DUMMY_EPID) || + (epid == INVALID_EPID)) { + /* Nothing here to see. */ + continue; + } + + /* Get the first urb (if any). */ + urb = urb_list_first(epid); + + if (urb) { + + /* Sanity check. */ + assert(usb_pipetype(urb->pipe) == PIPE_CONTROL); + + urb_priv = (etrax_urb_priv_t *)urb->hcpriv; + assert(urb_priv); + + if (urb_priv->urb_state == WAITING_FOR_DESCR_INTR) { + assert(!(TxCtrlEPList[urb_priv->epid].command & IO_MASK(USB_EP_command, enable))); + + etrax_usb_complete_urb(urb, 0); + } + } + } + restore_flags(flags); + } + if (*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma8_sub2_descr)) { + dbg_intr("dma8_sub2_descr (INTR) intr."); + *R_DMA_CH8_SUB2_CLR_INTR = IO_STATE(R_DMA_CH8_SUB2_CLR_INTR, clr_descr, do); + } + if (*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma8_sub3_descr)) { + struct urb *urb; + int epid; + int epid_done; + etrax_urb_priv_t *urb_priv; + USB_SB_Desc_t *sb_desc; + + usb_isoc_complete_data_t *comp_data = NULL; + + /* One or more isoc out transfers are done. */ + dbg_isoc("dma8_sub3_descr (ISOC) intr."); + + /* For each isoc out EP search for the first sb_desc with the intr flag + set. This descriptor must be the last packet from an URB. Then + traverse the URB list for the EP until the URB with urb_priv->last_sb + matching the intr-marked sb_desc is found. All URBs before this have + been sent. + */ + + for (epid = 0; epid < NBR_OF_EPIDS - 1; epid++) { + /* Skip past epids with no SB lists, epids used for in traffic, + and special (dummy, invalid) epids. */ + if ((TxIsocEPList[epid].sub == 0) || + (test_bit(epid, (void *)&epid_out_traffic) == 0) || + (epid == DUMMY_EPID) || + (epid == INVALID_EPID)) { + /* Nothing here to see. */ + continue; + } + sb_desc = phys_to_virt(TxIsocEPList[epid].sub); + + /* Find the last descriptor of the currently active URB for this ep. + This is the first descriptor in the sub list marked for a descriptor + interrupt. */ + while (sb_desc && !IO_EXTRACT(USB_SB_command, intr, sb_desc->command)) { + sb_desc = sb_desc->next ? phys_to_virt(sb_desc->next) : 0; + } + assert(sb_desc); + + dbg_isoc("Check epid %d, sub 0x%p, SB 0x%p", + epid, + phys_to_virt(TxIsocEPList[epid].sub), + sb_desc); + + epid_done = 0; + + /* Get the first urb (if any). */ + urb = urb_list_first(epid); + assert(urb); + + while (urb && !epid_done) { + + /* Sanity check. */ + assert(usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS); + + if (!usb_pipeout(urb->pipe)) { + /* descr interrupts are generated only for out pipes. */ + epid_done = 1; + continue; + } + + urb_priv = (etrax_urb_priv_t *)urb->hcpriv; + assert(urb_priv); + + if (sb_desc != urb_priv->last_sb) { + + /* This urb has been sent. */ + dbg_isoc("out URB 0x%p sent", urb); + + urb_priv->urb_state = TRANSFER_DONE; + + } else if ((sb_desc == urb_priv->last_sb) && + !(TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable))) { + + assert((sb_desc->command & IO_MASK(USB_SB_command, eol)) == IO_STATE(USB_SB_command, eol, yes)); + assert(sb_desc->next == 0); + + dbg_isoc("out URB 0x%p last in list, epid disabled", urb); + TxIsocEPList[epid].sub = 0; + TxIsocEPList[epid].hw_len = 0; + urb_priv->urb_state = TRANSFER_DONE; + + epid_done = 1; + + } else { + epid_done = 1; + } + if (!epid_done) { + urb = urb_list_next(urb, epid); + } + } + + } + + *R_DMA_CH8_SUB3_CLR_INTR = IO_STATE(R_DMA_CH8_SUB3_CLR_INTR, clr_descr, do); + + comp_data = (usb_isoc_complete_data_t*)kmem_cache_alloc(isoc_compl_cache, SLAB_ATOMIC); + assert(comp_data != NULL); + + INIT_WORK(&comp_data->usb_bh, etrax_usb_isoc_descr_interrupt_bottom_half, comp_data); + schedule_work(&comp_data->usb_bh); + } + + DBFEXIT; + return IRQ_HANDLED; +} + +static void etrax_usb_isoc_descr_interrupt_bottom_half(void *data) +{ + usb_isoc_complete_data_t *comp_data = (usb_isoc_complete_data_t*)data; + + struct urb *urb; + int epid; + int epid_done; + etrax_urb_priv_t *urb_priv; + + DBFENTER; + + dbg_isoc("dma8_sub3_descr (ISOC) bottom half."); + + for (epid = 0; epid < NBR_OF_EPIDS - 1; epid++) { + unsigned long flags; + + save_flags(flags); + cli(); + + epid_done = 0; + + /* The descriptor interrupt handler has marked all transmitted isoch. out + URBs with TRANSFER_DONE. Now we traverse all epids and for all that + have isoch. out traffic traverse its URB list and complete the + transmitted URB. + */ + + while (!epid_done) { + + /* Get the first urb (if any). */ + urb = urb_list_first(epid); + if (urb == 0) { + epid_done = 1; + continue; + } + + if (usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS) { + epid_done = 1; + continue; + } + + if (!usb_pipeout(urb->pipe)) { + /* descr interrupts are generated only for out pipes. */ + epid_done = 1; + continue; + } + + dbg_isoc("Check epid %d, SB 0x%p", epid, (char*)TxIsocEPList[epid].sub); + + urb_priv = (etrax_urb_priv_t *)urb->hcpriv; + assert(urb_priv); + + if (urb_priv->urb_state == TRANSFER_DONE) { + int i; + struct usb_iso_packet_descriptor *packet; + + /* This urb has been sent. */ + dbg_isoc("Completing isoc out URB 0x%p", urb); + + for (i = 0; i < urb->number_of_packets; i++) { + packet = &urb->iso_frame_desc[i]; + packet->status = 0; + packet->actual_length = packet->length; + } + + etrax_usb_complete_isoc_urb(urb, 0); + + if (urb_list_empty(epid)) { + etrax_usb_free_epid(epid); + epid_done = 1; + } + } else { + epid_done = 1; + } + } + restore_flags(flags); + + } + kmem_cache_free(isoc_compl_cache, comp_data); + + DBFEXIT; +} + + + +static irqreturn_t etrax_usb_rx_interrupt(int irq, void *vhc, struct pt_regs *regs) +{ + struct urb *urb; + etrax_urb_priv_t *urb_priv; + int epid = 0; + unsigned long flags; + + /* Isoc diagnostics. */ + static int curr_fm = 0; + static int prev_fm = 0; + + DBFENTER; + + /* Clear this interrupt. */ + *R_DMA_CH9_CLR_INTR = IO_STATE(R_DMA_CH9_CLR_INTR, clr_eop, do); + + /* Note that this while loop assumes that all packets span only + one rx descriptor. */ + + /* The reason we cli here is that we call the driver's callback functions. */ + save_flags(flags); + cli(); + + while (myNextRxDesc->status & IO_MASK(USB_IN_status, eop)) { + + epid = IO_EXTRACT(USB_IN_status, epid, myNextRxDesc->status); + urb = urb_list_first(epid); + + //printk("eop for epid %d, first urb 0x%lx\n", epid, (unsigned long)urb); + + if (!urb) { + err("No urb for epid %d in rx interrupt", epid); + __dump_ept_data(epid); + goto skip_out; + } + + /* Note that we cannot indescriminately assert(usb_pipein(urb->pipe)) since + ctrl pipes are not. */ + + if (myNextRxDesc->status & IO_MASK(USB_IN_status, error)) { + __u32 r_usb_ept_data; + int no_error = 0; + + assert(test_bit(epid, (void *)&epid_usage_bitmask)); + + *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid); + nop(); + if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { + r_usb_ept_data = *R_USB_EPT_DATA_ISO; + + if ((r_usb_ept_data & IO_MASK(R_USB_EPT_DATA_ISO, valid)) && + (IO_EXTRACT(R_USB_EPT_DATA_ISO, error_code, r_usb_ept_data) == 0) && + (myNextRxDesc->status & IO_MASK(USB_IN_status, nodata))) { + /* Not an error, just a failure to receive an expected iso + in packet in this frame. This is not documented + in the designers reference. + */ + no_error++; + } else { + warn("R_USB_EPT_DATA_ISO for epid %d = 0x%x", epid, r_usb_ept_data); + } + } else { + r_usb_ept_data = *R_USB_EPT_DATA; + warn("R_USB_EPT_DATA for epid %d = 0x%x", epid, r_usb_ept_data); + } + + if (!no_error){ + warn("error in rx desc->status, epid %d, first urb = 0x%lx", + epid, (unsigned long)urb); + __dump_in_desc(myNextRxDesc); + + warn("R_USB_STATUS = 0x%x", *R_USB_STATUS); + + /* Check that ept was disabled when error occurred. */ + switch (usb_pipetype(urb->pipe)) { + case PIPE_BULK: + assert(!(TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable))); + break; + case PIPE_CONTROL: + assert(!(TxCtrlEPList[epid].command & IO_MASK(USB_EP_command, enable))); + break; + case PIPE_INTERRUPT: + assert(!(TxIntrEPList[epid].command & IO_MASK(USB_EP_command, enable))); + break; + case PIPE_ISOCHRONOUS: + assert(!(TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable))); + break; + default: + warn("etrax_usb_rx_interrupt: bad pipetype %d in urb 0x%p", + usb_pipetype(urb->pipe), + urb); + } + etrax_usb_complete_urb(urb, -EPROTO); + goto skip_out; + } + } + + urb_priv = (etrax_urb_priv_t *)urb->hcpriv; + assert(urb_priv); + + if ((usb_pipetype(urb->pipe) == PIPE_BULK) || + (usb_pipetype(urb->pipe) == PIPE_CONTROL) || + (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)) { + + if (myNextRxDesc->status & IO_MASK(USB_IN_status, nodata)) { + /* We get nodata for empty data transactions, and the rx descriptor's + hw_len field is not valid in that case. No data to copy in other + words. */ + } else { + /* Make sure the data fits in the buffer. */ + assert(urb_priv->rx_offset + myNextRxDesc->hw_len + <= urb->transfer_buffer_length); + + memcpy(urb->transfer_buffer + urb_priv->rx_offset, + phys_to_virt(myNextRxDesc->buf), myNextRxDesc->hw_len); + urb_priv->rx_offset += myNextRxDesc->hw_len; + } + + if (myNextRxDesc->status & IO_MASK(USB_IN_status, eot)) { + if ((usb_pipetype(urb->pipe) == PIPE_CONTROL) && + ((TxCtrlEPList[urb_priv->epid].command & IO_MASK(USB_EP_command, enable)) == + IO_STATE(USB_EP_command, enable, yes))) { + /* The EP is still enabled, so the OUT packet used to ack + the in data is probably not processed yet. If the EP + sub pointer has not moved beyond urb_priv->last_sb mark + it for a descriptor interrupt and complete the urb in + the descriptor interrupt handler. + */ + USB_SB_Desc_t *sub = TxCtrlEPList[urb_priv->epid].sub ? phys_to_virt(TxCtrlEPList[urb_priv->epid].sub) : 0; + + while ((sub != NULL) && (sub != urb_priv->last_sb)) { + sub = sub->next ? phys_to_virt(sub->next) : 0; + } + if (sub != NULL) { + /* The urb has not been fully processed. */ + urb_priv->urb_state = WAITING_FOR_DESCR_INTR; + } else { + warn("(CTRL) epid enabled and urb (0x%p) processed, ep->sub=0x%p", urb, (char*)TxCtrlEPList[urb_priv->epid].sub); + etrax_usb_complete_urb(urb, 0); + } + } else { + etrax_usb_complete_urb(urb, 0); + } + } + + } else if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { + + struct usb_iso_packet_descriptor *packet; + + if (urb_priv->urb_state == UNLINK) { + info("Ignoring rx data for urb being unlinked."); + goto skip_out; + } else if (urb_priv->urb_state == NOT_STARTED) { + info("What? Got rx data for urb that isn't started?"); + goto skip_out; + } + + packet = &urb->iso_frame_desc[urb_priv->isoc_packet_counter]; + packet->status = 0; + + if (myNextRxDesc->status & IO_MASK(USB_IN_status, nodata)) { + /* We get nodata for empty data transactions, and the rx descriptor's + hw_len field is not valid in that case. We copy 0 bytes however to + stay in synch. */ + packet->actual_length = 0; + } else { + packet->actual_length = myNextRxDesc->hw_len; + /* Make sure the data fits in the buffer. */ + assert(packet->actual_length <= packet->length); + memcpy(urb->transfer_buffer + packet->offset, + phys_to_virt(myNextRxDesc->buf), packet->actual_length); + } + + /* Increment the packet counter. */ + urb_priv->isoc_packet_counter++; + + /* Note that we don't care about the eot field in the rx descriptor's status. + It will always be set for isoc traffic. */ + if (urb->number_of_packets == urb_priv->isoc_packet_counter) { + + /* Out-of-synch diagnostics. */ + curr_fm = (*R_USB_FM_NUMBER & 0x7ff); + if (((prev_fm + urb_priv->isoc_packet_counter) % (0x7ff + 1)) != curr_fm) { + /* This test is wrong, if there is more than one isoc + in endpoint active it will always calculate wrong + since prev_fm is shared by all endpoints. + + FIXME Make this check per URB using urb->start_frame. + */ + dbg_isoc("Out of synch? Previous frame = %d, current frame = %d", + prev_fm, curr_fm); + + } + prev_fm = curr_fm; + + /* Complete the urb with status OK. */ + etrax_usb_complete_isoc_urb(urb, 0); + } + } + + skip_out: + + /* DMA IN cache bug. Flush the DMA IN buffer from the cache. (struct etrax_dma_descr + has the same layout as USB_IN_Desc for the relevant fields.) */ + prepare_rx_descriptor((struct etrax_dma_descr*)myNextRxDesc); + + myPrevRxDesc = myNextRxDesc; + myPrevRxDesc->command |= IO_MASK(USB_IN_command, eol); + myLastRxDesc->command &= ~IO_MASK(USB_IN_command, eol); + myLastRxDesc = myPrevRxDesc; + + myNextRxDesc->status = 0; + myNextRxDesc = phys_to_virt(myNextRxDesc->next); + } + + restore_flags(flags); + + DBFEXIT; + + return IRQ_HANDLED; +} + + +/* This function will unlink the SB descriptors associated with this urb. */ +static int etrax_remove_from_sb_list(struct urb *urb) +{ + USB_SB_Desc_t *next_sb, *first_sb, *last_sb; + etrax_urb_priv_t *urb_priv; + int i = 0; + + DBFENTER; + + urb_priv = (etrax_urb_priv_t *)urb->hcpriv; + assert(urb_priv); + + /* Just a sanity check. Since we don't fiddle with the DMA list the EP descriptor + doesn't really need to be disabled, it's just that we expect it to be. */ + if (usb_pipetype(urb->pipe) == PIPE_BULK) { + assert(!(TxBulkEPList[urb_priv->epid].command & IO_MASK(USB_EP_command, enable))); + } else if (usb_pipetype(urb->pipe) == PIPE_CONTROL) { + assert(!(TxCtrlEPList[urb_priv->epid].command & IO_MASK(USB_EP_command, enable))); + } + + first_sb = urb_priv->first_sb; + last_sb = urb_priv->last_sb; + + assert(first_sb); + assert(last_sb); + + while (first_sb != last_sb) { + next_sb = (USB_SB_Desc_t *)phys_to_virt(first_sb->next); + kmem_cache_free(usb_desc_cache, first_sb); + first_sb = next_sb; + i++; + } + kmem_cache_free(usb_desc_cache, last_sb); + i++; + dbg_sb("%d SB descriptors freed", i); + /* Compare i with urb->number_of_packets for Isoc traffic. + Should be same when calling unlink_urb */ + + DBFEXIT; + + return i; +} + +static int etrax_usb_submit_bulk_urb(struct urb *urb) +{ + int epid; + int empty; + unsigned long flags; + etrax_urb_priv_t *urb_priv; + + DBFENTER; + + /* Epid allocation, empty check and list add must be protected. + Read about this in etrax_usb_submit_ctrl_urb. */ + + spin_lock_irqsave(&urb_list_lock, flags); + epid = etrax_usb_setup_epid(urb); + if (epid == -1) { + DBFEXIT; + spin_unlock_irqrestore(&urb_list_lock, flags); + return -ENOMEM; + } + empty = urb_list_empty(epid); + urb_list_add(urb, epid); + spin_unlock_irqrestore(&urb_list_lock, flags); + + dbg_bulk("Adding bulk %s urb 0x%lx to %s list, epid %d", + usb_pipein(urb->pipe) ? "IN" : "OUT", (unsigned long)urb, empty ? "empty" : "", epid); + + /* Mark the urb as being in progress. */ + urb->status = -EINPROGRESS; + + /* Setup the hcpriv data. */ + urb_priv = kmalloc(sizeof(etrax_urb_priv_t), KMALLOC_FLAG); + assert(urb_priv != NULL); + /* This sets rx_offset to 0. */ + memset(urb_priv, 0, sizeof(etrax_urb_priv_t)); + urb_priv->urb_state = NOT_STARTED; + urb->hcpriv = urb_priv; + + if (empty) { + etrax_usb_add_to_bulk_sb_list(urb, epid); + } + + DBFEXIT; + + return 0; +} + +static void etrax_usb_add_to_bulk_sb_list(struct urb *urb, int epid) +{ + USB_SB_Desc_t *sb_desc; + etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv; + unsigned long flags; + char maxlen; + + DBFENTER; + + dbg_bulk("etrax_usb_add_to_bulk_sb_list, urb 0x%lx", (unsigned long)urb); + + maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)); + + sb_desc = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG); + assert(sb_desc != NULL); + memset(sb_desc, 0, sizeof(USB_SB_Desc_t)); + + + if (usb_pipeout(urb->pipe)) { + + dbg_bulk("Grabbing bulk OUT, urb 0x%lx, epid %d", (unsigned long)urb, epid); + + /* This is probably a sanity check of the bulk transaction length + not being larger than 64 kB. */ + if (urb->transfer_buffer_length > 0xffff) { + panic("urb->transfer_buffer_length > 0xffff"); + } + + sb_desc->sw_len = urb->transfer_buffer_length; + + /* The rem field is don't care if it's not a full-length transfer, so setting + it shouldn't hurt. Also, rem isn't used for OUT traffic. */ + sb_desc->command = (IO_FIELD(USB_SB_command, rem, 0) | + IO_STATE(USB_SB_command, tt, out) | + IO_STATE(USB_SB_command, eot, yes) | + IO_STATE(USB_SB_command, eol, yes)); + + /* The full field is set to yes, even if we don't actually check that this is + a full-length transfer (i.e., that transfer_buffer_length % maxlen = 0). + Setting full prevents the USB controller from sending an empty packet in + that case. However, if URB_ZERO_PACKET was set we want that. */ + if (!(urb->transfer_flags & URB_ZERO_PACKET)) { + sb_desc->command |= IO_STATE(USB_SB_command, full, yes); + } + + sb_desc->buf = virt_to_phys(urb->transfer_buffer); + sb_desc->next = 0; + + } else if (usb_pipein(urb->pipe)) { + + dbg_bulk("Grabbing bulk IN, urb 0x%lx, epid %d", (unsigned long)urb, epid); + + sb_desc->sw_len = urb->transfer_buffer_length ? + (urb->transfer_buffer_length - 1) / maxlen + 1 : 0; + + /* The rem field is don't care if it's not a full-length transfer, so setting + it shouldn't hurt. */ + sb_desc->command = + (IO_FIELD(USB_SB_command, rem, + urb->transfer_buffer_length % maxlen) | + IO_STATE(USB_SB_command, tt, in) | + IO_STATE(USB_SB_command, eot, yes) | + IO_STATE(USB_SB_command, eol, yes)); + + sb_desc->buf = 0; + sb_desc->next = 0; + } + + urb_priv->first_sb = sb_desc; + urb_priv->last_sb = sb_desc; + urb_priv->epid = epid; + + urb->hcpriv = urb_priv; + + /* Reset toggle bits and reset error count. */ + save_flags(flags); + cli(); + + *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid); + nop(); + + /* FIXME: Is this a special case since the hold field is checked, + or should we check hold in a lot of other cases as well? */ + if (*R_USB_EPT_DATA & IO_MASK(R_USB_EPT_DATA, hold)) { + panic("Hold was set in %s", __FUNCTION__); + } + + /* Reset error counters (regardless of which direction this traffic is). */ + *R_USB_EPT_DATA &= + ~(IO_MASK(R_USB_EPT_DATA, error_count_in) | + IO_MASK(R_USB_EPT_DATA, error_count_out)); + + /* Software must preset the toggle bits. */ + if (usb_pipeout(urb->pipe)) { + char toggle = + usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe), usb_pipeout(urb->pipe)); + *R_USB_EPT_DATA &= ~IO_MASK(R_USB_EPT_DATA, t_out); + *R_USB_EPT_DATA |= IO_FIELD(R_USB_EPT_DATA, t_out, toggle); + } else { + char toggle = + usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe), usb_pipeout(urb->pipe)); + *R_USB_EPT_DATA &= ~IO_MASK(R_USB_EPT_DATA, t_in); + *R_USB_EPT_DATA |= IO_FIELD(R_USB_EPT_DATA, t_in, toggle); + } + + /* Assert that the EP descriptor is disabled. */ + assert(!(TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable))); + + /* The reason we set the EP's sub pointer directly instead of + walking the SB list and linking it last in the list is that we only + have one active urb at a time (the rest are queued). */ + + /* Note that we cannot have interrupts running when we have set the SB descriptor + but the EP is not yet enabled. If a bulk eot happens for another EP, we will + find this EP disabled and with a SB != 0, which will make us think that it's done. */ + TxBulkEPList[epid].sub = virt_to_phys(sb_desc); + TxBulkEPList[epid].hw_len = 0; + /* Note that we don't have to fill in the ep_id field since this + was done when we allocated the EP descriptors in init_tx_bulk_ep. */ + + /* Check if the dummy list is already with us (if several urbs were queued). */ + if (TxBulkEPList[epid].next != virt_to_phys(&TxBulkDummyEPList[epid][0])) { + + dbg_bulk("Inviting dummy list to the party for urb 0x%lx, epid %d", + (unsigned long)urb, epid); + + /* The last EP in the dummy list already has its next pointer set to + TxBulkEPList[epid].next. */ + + /* We don't need to check if the DMA is at this EP or not before changing the + next pointer, since we will do it in one 32-bit write (EP descriptors are + 32-bit aligned). */ + TxBulkEPList[epid].next = virt_to_phys(&TxBulkDummyEPList[epid][0]); + } + /* Enable the EP descr. */ + dbg_bulk("Enabling bulk EP for urb 0x%lx, epid %d", (unsigned long)urb, epid); + TxBulkEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes); + + /* Everything is set up, safe to enable interrupts again. */ + restore_flags(flags); + + /* If the DMA bulk channel isn't running, we need to restart it if it + has stopped at the last EP descriptor (DMA stopped because there was + no more traffic) or if it has stopped at a dummy EP with the intr flag + set (DMA stopped because we were too slow in inserting new traffic). */ + if (!(*R_DMA_CH8_SUB0_CMD & IO_MASK(R_DMA_CH8_SUB0_CMD, cmd))) { + + USB_EP_Desc_t *ep; + ep = (USB_EP_Desc_t *)phys_to_virt(*R_DMA_CH8_SUB0_EP); + dbg_bulk("DMA channel not running in add"); + dbg_bulk("DMA is at 0x%lx", (unsigned long)ep); + + if (*R_DMA_CH8_SUB0_EP == virt_to_phys(&TxBulkEPList[NBR_OF_EPIDS - 1]) || + (ep->command & 0x8) >> 3) { + *R_DMA_CH8_SUB0_CMD = IO_STATE(R_DMA_CH8_SUB0_CMD, cmd, start); + /* Update/restart the bulk start timer since we just started the channel. */ + mod_timer(&bulk_start_timer, jiffies + BULK_START_TIMER_INTERVAL); + /* Update/restart the bulk eot timer since we just inserted traffic. */ + mod_timer(&bulk_eot_timer, jiffies + BULK_EOT_TIMER_INTERVAL); + } + } + + DBFEXIT; +} + +static void etrax_usb_complete_bulk_urb(struct urb *urb, int status) +{ + etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv; + int epid = urb_priv->epid; + unsigned long flags; + + DBFENTER; + + if (status) + warn("Completing bulk urb with status %d.", status); + + dbg_bulk("Completing bulk urb 0x%lx for epid %d", (unsigned long)urb, epid); + + /* Update the urb list. */ + urb_list_del(urb, epid); + + /* For an IN pipe, we always set the actual length, regardless of whether there was + an error or not (which means the device driver can use the data if it wants to). */ + if (usb_pipein(urb->pipe)) { + urb->actual_length = urb_priv->rx_offset; + } else { + /* Set actual_length for OUT urbs also; the USB mass storage driver seems + to want that. We wouldn't know of any partial writes if there was an error. */ + if (status == 0) { + urb->actual_length = urb->transfer_buffer_length; + } else { + urb->actual_length = 0; + } + } + + /* FIXME: Is there something of the things below we shouldn't do if there was an error? + Like, maybe we shouldn't toggle the toggle bits, or maybe we shouldn't insert more traffic. */ + + save_flags(flags); + cli(); + + *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid); + nop(); + + /* We need to fiddle with the toggle bits because the hardware doesn't do it for us. */ + if (usb_pipeout(urb->pipe)) { + char toggle = + IO_EXTRACT(R_USB_EPT_DATA, t_out, *R_USB_EPT_DATA); + usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), + usb_pipeout(urb->pipe), toggle); + } else { + char toggle = + IO_EXTRACT(R_USB_EPT_DATA, t_in, *R_USB_EPT_DATA); + usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), + usb_pipeout(urb->pipe), toggle); + } + restore_flags(flags); + + /* Remember to free the SBs. */ + etrax_remove_from_sb_list(urb); + kfree(urb_priv); + urb->hcpriv = 0; + + /* If there are any more urb's in the list we'd better start sending */ + if (!urb_list_empty(epid)) { + + struct urb *new_urb; + + /* Get the first urb. */ + new_urb = urb_list_first(epid); + assert(new_urb); + + dbg_bulk("More bulk for epid %d", epid); + + etrax_usb_add_to_bulk_sb_list(new_urb, epid); + } + + urb->status = status; + + /* We let any non-zero status from the layer above have precedence. */ + if (status == 0) { + /* URB_SHORT_NOT_OK means that short reads (shorter than the endpoint's max length) + is to be treated as an error. */ + if (urb->transfer_flags & URB_SHORT_NOT_OK) { + if (usb_pipein(urb->pipe) && + (urb->actual_length != + usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)))) { + urb->status = -EREMOTEIO; + } + } + } + + if (urb->complete) { + urb->complete(urb, NULL); + } + + if (urb_list_empty(epid)) { + /* This means that this EP is now free, deconfigure it. */ + etrax_usb_free_epid(epid); + + /* No more traffic; time to clean up. + Must set sub pointer to 0, since we look at the sub pointer when handling + the bulk eot interrupt. */ + + dbg_bulk("No bulk for epid %d", epid); + + TxBulkEPList[epid].sub = 0; + + /* Unlink the dummy list. */ + + dbg_bulk("Kicking dummy list out of party for urb 0x%lx, epid %d", + (unsigned long)urb, epid); + + /* No need to wait for the DMA before changing the next pointer. + The modulo NBR_OF_EPIDS isn't actually necessary, since we will never use + the last one (INVALID_EPID) for actual traffic. */ + TxBulkEPList[epid].next = + virt_to_phys(&TxBulkEPList[(epid + 1) % NBR_OF_EPIDS]); + } + + DBFEXIT; +} + +static int etrax_usb_submit_ctrl_urb(struct urb *urb) +{ + int epid; + int empty; + unsigned long flags; + etrax_urb_priv_t *urb_priv; + + DBFENTER; + + /* FIXME: Return -ENXIO if there is already a queued urb for this endpoint? */ + + /* Epid allocation, empty check and list add must be protected. + + Epid allocation because if we find an existing epid for this endpoint an urb might be + completed (emptying the list) before we add the new urb to the list, causing the epid + to be de-allocated. We would then start the transfer with an invalid epid -> epid attn. + + Empty check and add because otherwise we might conclude that the list is not empty, + after which it becomes empty before we add the new urb to the list, causing us not to + insert the new traffic into the SB list. */ + + spin_lock_irqsave(&urb_list_lock, flags); + epid = etrax_usb_setup_epid(urb); + if (epid == -1) { + spin_unlock_irqrestore(&urb_list_lock, flags); + DBFEXIT; + return -ENOMEM; + } + empty = urb_list_empty(epid); + urb_list_add(urb, epid); + spin_unlock_irqrestore(&urb_list_lock, flags); + + dbg_ctrl("Adding ctrl urb 0x%lx to %s list, epid %d", + (unsigned long)urb, empty ? "empty" : "", epid); + + /* Mark the urb as being in progress. */ + urb->status = -EINPROGRESS; + + /* Setup the hcpriv data. */ + urb_priv = kmalloc(sizeof(etrax_urb_priv_t), KMALLOC_FLAG); + assert(urb_priv != NULL); + /* This sets rx_offset to 0. */ + memset(urb_priv, 0, sizeof(etrax_urb_priv_t)); + urb_priv->urb_state = NOT_STARTED; + urb->hcpriv = urb_priv; + + if (empty) { + etrax_usb_add_to_ctrl_sb_list(urb, epid); + } + + DBFEXIT; + + return 0; +} + +static void etrax_usb_add_to_ctrl_sb_list(struct urb *urb, int epid) +{ + USB_SB_Desc_t *sb_desc_setup; + USB_SB_Desc_t *sb_desc_data; + USB_SB_Desc_t *sb_desc_status; + + etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv; + + unsigned long flags; + char maxlen; + + DBFENTER; + + maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)); + + sb_desc_setup = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG); + assert(sb_desc_setup != NULL); + sb_desc_status = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG); + assert(sb_desc_status != NULL); + + /* Initialize the mandatory setup SB descriptor (used only in control transfers) */ + sb_desc_setup->sw_len = 8; + sb_desc_setup->command = (IO_FIELD(USB_SB_command, rem, 0) | + IO_STATE(USB_SB_command, tt, setup) | + IO_STATE(USB_SB_command, full, yes) | + IO_STATE(USB_SB_command, eot, yes)); + + sb_desc_setup->buf = virt_to_phys(urb->setup_packet); + + if (usb_pipeout(urb->pipe)) { + dbg_ctrl("Transfer for epid %d is OUT", epid); + + /* If this Control OUT transfer has an optional data stage we add an OUT token + before the mandatory IN (status) token, hence the reordered SB list */ + + sb_desc_setup->next = virt_to_phys(sb_desc_status); + if (urb->transfer_buffer) { + + dbg_ctrl("This OUT transfer has an extra data stage"); + + sb_desc_data = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG); + assert(sb_desc_data != NULL); + + sb_desc_setup->next = virt_to_phys(sb_desc_data); + + sb_desc_data->sw_len = urb->transfer_buffer_length; + sb_desc_data->command = (IO_STATE(USB_SB_command, tt, out) | + IO_STATE(USB_SB_command, full, yes) | + IO_STATE(USB_SB_command, eot, yes)); + sb_desc_data->buf = virt_to_phys(urb->transfer_buffer); + sb_desc_data->next = virt_to_phys(sb_desc_status); + } + + sb_desc_status->sw_len = 1; + sb_desc_status->command = (IO_FIELD(USB_SB_command, rem, 0) | + IO_STATE(USB_SB_command, tt, in) | + IO_STATE(USB_SB_command, eot, yes) | + IO_STATE(USB_SB_command, intr, yes) | + IO_STATE(USB_SB_command, eol, yes)); + + sb_desc_status->buf = 0; + sb_desc_status->next = 0; + + } else if (usb_pipein(urb->pipe)) { + + dbg_ctrl("Transfer for epid %d is IN", epid); + dbg_ctrl("transfer_buffer_length = %d", urb->transfer_buffer_length); + dbg_ctrl("rem is calculated to %d", urb->transfer_buffer_length % maxlen); + + sb_desc_data = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG); + assert(sb_desc_data != NULL); + + sb_desc_setup->next = virt_to_phys(sb_desc_data); + + sb_desc_data->sw_len = urb->transfer_buffer_length ? + (urb->transfer_buffer_length - 1) / maxlen + 1 : 0; + dbg_ctrl("sw_len got %d", sb_desc_data->sw_len); + + sb_desc_data->command = + (IO_FIELD(USB_SB_command, rem, + urb->transfer_buffer_length % maxlen) | + IO_STATE(USB_SB_command, tt, in) | + IO_STATE(USB_SB_command, eot, yes)); + + sb_desc_data->buf = 0; + sb_desc_data->next = virt_to_phys(sb_desc_status); + + /* Read comment at zout_buffer declaration for an explanation to this. */ + sb_desc_status->sw_len = 1; + sb_desc_status->command = (IO_FIELD(USB_SB_command, rem, 0) | + IO_STATE(USB_SB_command, tt, zout) | + IO_STATE(USB_SB_command, full, yes) | + IO_STATE(USB_SB_command, eot, yes) | + IO_STATE(USB_SB_command, intr, yes) | + IO_STATE(USB_SB_command, eol, yes)); + + sb_desc_status->buf = virt_to_phys(&zout_buffer[0]); + sb_desc_status->next = 0; + } + + urb_priv->first_sb = sb_desc_setup; + urb_priv->last_sb = sb_desc_status; + urb_priv->epid = epid; + + urb_priv->urb_state = STARTED; + + /* Reset toggle bits and reset error count, remember to di and ei */ + /* Warning: it is possible that this locking doesn't work with bottom-halves */ + + save_flags(flags); + cli(); + + *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid); + nop(); + if (*R_USB_EPT_DATA & IO_MASK(R_USB_EPT_DATA, hold)) { + panic("Hold was set in %s", __FUNCTION__); + } + + + /* FIXME: Compare with etrax_usb_add_to_bulk_sb_list where the toggle bits + are set to a specific value. Why the difference? Read "Transfer and Toggle Bits + in Designer's Reference, p. 8 - 11. */ + *R_USB_EPT_DATA &= + ~(IO_MASK(R_USB_EPT_DATA, error_count_in) | + IO_MASK(R_USB_EPT_DATA, error_count_out) | + IO_MASK(R_USB_EPT_DATA, t_in) | + IO_MASK(R_USB_EPT_DATA, t_out)); + + /* Since we use the rx interrupt to complete ctrl urbs, we can enable interrupts now + (i.e. we don't check the sub pointer on an eot interrupt like we do for bulk traffic). */ + restore_flags(flags); + + /* Assert that the EP descriptor is disabled. */ + assert(!(TxCtrlEPList[epid].command & IO_MASK(USB_EP_command, enable))); + + /* Set up and enable the EP descriptor. */ + TxCtrlEPList[epid].sub = virt_to_phys(sb_desc_setup); + TxCtrlEPList[epid].hw_len = 0; + TxCtrlEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes); + + /* We start the DMA sub channel without checking if it's running or not, because: + 1) If it's already running, issuing the start command is a nop. + 2) We avoid a test-and-set race condition. */ + *R_DMA_CH8_SUB1_CMD = IO_STATE(R_DMA_CH8_SUB1_CMD, cmd, start); + + DBFEXIT; +} + +static void etrax_usb_complete_ctrl_urb(struct urb *urb, int status) +{ + etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv; + int epid = urb_priv->epid; + + DBFENTER; + + if (status) + warn("Completing ctrl urb with status %d.", status); + + dbg_ctrl("Completing ctrl epid %d, urb 0x%lx", epid, (unsigned long)urb); + + /* Remove this urb from the list. */ + urb_list_del(urb, epid); + + /* For an IN pipe, we always set the actual length, regardless of whether there was + an error or not (which means the device driver can use the data if it wants to). */ + if (usb_pipein(urb->pipe)) { + urb->actual_length = urb_priv->rx_offset; + } + + /* FIXME: Is there something of the things below we shouldn't do if there was an error? + Like, maybe we shouldn't insert more traffic. */ + + /* Remember to free the SBs. */ + etrax_remove_from_sb_list(urb); + kfree(urb_priv); + urb->hcpriv = 0; + + /* If there are any more urbs in the list we'd better start sending. */ + if (!urb_list_empty(epid)) { + struct urb *new_urb; + + /* Get the first urb. */ + new_urb = urb_list_first(epid); + assert(new_urb); + + dbg_ctrl("More ctrl for epid %d, first urb = 0x%lx", epid, (unsigned long)new_urb); + + etrax_usb_add_to_ctrl_sb_list(new_urb, epid); + } + + urb->status = status; + + /* We let any non-zero status from the layer above have precedence. */ + if (status == 0) { + /* URB_SHORT_NOT_OK means that short reads (shorter than the endpoint's max length) + is to be treated as an error. */ + if (urb->transfer_flags & URB_SHORT_NOT_OK) { + if (usb_pipein(urb->pipe) && + (urb->actual_length != + usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)))) { + urb->status = -EREMOTEIO; + } + } + } + + if (urb->complete) { + urb->complete(urb, NULL); + } + + if (urb_list_empty(epid)) { + /* No more traffic. Time to clean up. */ + etrax_usb_free_epid(epid); + /* Must set sub pointer to 0. */ + dbg_ctrl("No ctrl for epid %d", epid); + TxCtrlEPList[epid].sub = 0; + } + + DBFEXIT; +} + +static int etrax_usb_submit_intr_urb(struct urb *urb) +{ + + int epid; + + DBFENTER; + + if (usb_pipeout(urb->pipe)) { + /* Unsupported transfer type. + We don't support interrupt out traffic. (If we do, we can't support + intervals for neither in or out traffic, but are forced to schedule all + interrupt traffic in one frame.) */ + return -EINVAL; + } + + epid = etrax_usb_setup_epid(urb); + if (epid == -1) { + DBFEXIT; + return -ENOMEM; + } + + if (!urb_list_empty(epid)) { + /* There is already a queued urb for this endpoint. */ + etrax_usb_free_epid(epid); + return -ENXIO; + } + + urb->status = -EINPROGRESS; + + dbg_intr("Add intr urb 0x%lx, to list, epid %d", (unsigned long)urb, epid); + + urb_list_add(urb, epid); + etrax_usb_add_to_intr_sb_list(urb, epid); + + return 0; + + DBFEXIT; +} + +static void etrax_usb_add_to_intr_sb_list(struct urb *urb, int epid) +{ + + volatile USB_EP_Desc_t *tmp_ep; + volatile USB_EP_Desc_t *first_ep; + + char maxlen; + int interval; + int i; + + etrax_urb_priv_t *urb_priv; + + DBFENTER; + + maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)); + interval = urb->interval; + + urb_priv = kmalloc(sizeof(etrax_urb_priv_t), KMALLOC_FLAG); + assert(urb_priv != NULL); + memset(urb_priv, 0, sizeof(etrax_urb_priv_t)); + urb->hcpriv = urb_priv; + + first_ep = &TxIntrEPList[0]; + + /* Round of the interval to 2^n, it is obvious that this code favours + smaller numbers, but that is actually a good thing */ + /* FIXME: The "rounding error" for larger intervals will be quite + large. For in traffic this shouldn't be a problem since it will only + mean that we "poll" more often. */ + for (i = 0; interval; i++) { + interval = interval >> 1; + } + interval = 1 << (i - 1); + + dbg_intr("Interval rounded to %d", interval); + + tmp_ep = first_ep; + i = 0; + do { + if (tmp_ep->command & IO_MASK(USB_EP_command, eof)) { + if ((i % interval) == 0) { + /* Insert the traffic ep after tmp_ep */ + USB_EP_Desc_t *ep_desc; + USB_SB_Desc_t *sb_desc; + + dbg_intr("Inserting EP for epid %d", epid); + + ep_desc = (USB_EP_Desc_t *) + kmem_cache_alloc(usb_desc_cache, SLAB_FLAG); + sb_desc = (USB_SB_Desc_t *) + kmem_cache_alloc(usb_desc_cache, SLAB_FLAG); + assert(ep_desc != NULL); + CHECK_ALIGN(ep_desc); + assert(sb_desc != NULL); + + ep_desc->sub = virt_to_phys(sb_desc); + ep_desc->hw_len = 0; + ep_desc->command = (IO_FIELD(USB_EP_command, epid, epid) | + IO_STATE(USB_EP_command, enable, yes)); + + + /* Round upwards the number of packets of size maxlen + that this SB descriptor should receive. */ + sb_desc->sw_len = urb->transfer_buffer_length ? + (urb->transfer_buffer_length - 1) / maxlen + 1 : 0; + sb_desc->next = 0; + sb_desc->buf = 0; + sb_desc->command = + (IO_FIELD(USB_SB_command, rem, urb->transfer_buffer_length % maxlen) | + IO_STATE(USB_SB_command, tt, in) | + IO_STATE(USB_SB_command, eot, yes) | + IO_STATE(USB_SB_command, eol, yes)); + + ep_desc->next = tmp_ep->next; + tmp_ep->next = virt_to_phys(ep_desc); + } + i++; + } + tmp_ep = (USB_EP_Desc_t *)phys_to_virt(tmp_ep->next); + } while (tmp_ep != first_ep); + + + /* Note that first_sb/last_sb doesn't apply to interrupt traffic. */ + urb_priv->epid = epid; + + /* We start the DMA sub channel without checking if it's running or not, because: + 1) If it's already running, issuing the start command is a nop. + 2) We avoid a test-and-set race condition. */ + *R_DMA_CH8_SUB2_CMD = IO_STATE(R_DMA_CH8_SUB2_CMD, cmd, start); + + DBFEXIT; +} + + + +static void etrax_usb_complete_intr_urb(struct urb *urb, int status) +{ + etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv; + int epid = urb_priv->epid; + + DBFENTER; + + if (status) + warn("Completing intr urb with status %d.", status); + + dbg_intr("Completing intr epid %d, urb 0x%lx", epid, (unsigned long)urb); + + urb->status = status; + urb->actual_length = urb_priv->rx_offset; + + dbg_intr("interrupt urb->actual_length = %d", urb->actual_length); + + /* We let any non-zero status from the layer above have precedence. */ + if (status == 0) { + /* URB_SHORT_NOT_OK means that short reads (shorter than the endpoint's max length) + is to be treated as an error. */ + if (urb->transfer_flags & URB_SHORT_NOT_OK) { + if (urb->actual_length != + usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe))) { + urb->status = -EREMOTEIO; + } + } + } + + /* The driver will resubmit the URB so we need to remove it first */ + etrax_usb_unlink_urb(urb, 0); + if (urb->complete) { + urb->complete(urb, NULL); + } + + DBFEXIT; +} + + +static int etrax_usb_submit_isoc_urb(struct urb *urb) +{ + int epid; + unsigned long flags; + + DBFENTER; + + dbg_isoc("Submitting isoc urb = 0x%lx", (unsigned long)urb); + + /* Epid allocation, empty check and list add must be protected. + Read about this in etrax_usb_submit_ctrl_urb. */ + + spin_lock_irqsave(&urb_list_lock, flags); + /* Is there an active epid for this urb ? */ + epid = etrax_usb_setup_epid(urb); + if (epid == -1) { + DBFEXIT; + spin_unlock_irqrestore(&urb_list_lock, flags); + return -ENOMEM; + } + + /* Ok, now we got valid endpoint, lets insert some traffic */ + + urb->status = -EINPROGRESS; + + /* Find the last urb in the URB_List and add this urb after that one. + Also add the traffic, that is do an etrax_usb_add_to_isoc_sb_list. This + is important to make this in "real time" since isochronous traffic is + time sensitive. */ + + dbg_isoc("Adding isoc urb to (possibly empty) list"); + urb_list_add(urb, epid); + etrax_usb_add_to_isoc_sb_list(urb, epid); + spin_unlock_irqrestore(&urb_list_lock, flags); + + DBFEXIT; + + return 0; +} + +static void etrax_usb_check_error_isoc_ep(const int epid) +{ + unsigned long int flags; + int error_code; + __u32 r_usb_ept_data; + + /* We can't read R_USB_EPID_ATTN here since it would clear the iso_eof, + bulk_eot and epid_attn interrupts. So we just check the status of + the epid without testing if for it in R_USB_EPID_ATTN. */ + + + save_flags(flags); + cli(); + *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid); + nop(); + /* Note that although there are separate R_USB_EPT_DATA and R_USB_EPT_DATA_ISO + registers, they are located at the same address and are of the same size. + In other words, this read should be ok for isoc also. */ + r_usb_ept_data = *R_USB_EPT_DATA; + restore_flags(flags); + + error_code = IO_EXTRACT(R_USB_EPT_DATA_ISO, error_code, r_usb_ept_data); + + if (r_usb_ept_data & IO_MASK(R_USB_EPT_DATA, hold)) { + warn("Hold was set for epid %d.", epid); + return; + } + + if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA_ISO, error_code, no_error)) { + + /* This indicates that the SB list of the ept was completed before + new data was appended to it. This is not an error, but indicates + large system or USB load and could possibly cause trouble for + very timing sensitive USB device drivers so we log it. + */ + info("Isoc. epid %d disabled with no error", epid); + return; + + } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA_ISO, error_code, stall)) { + /* Not really a protocol error, just says that the endpoint gave + a stall response. Note that error_code cannot be stall for isoc. */ + panic("Isoc traffic cannot stall"); + + } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA_ISO, error_code, bus_error)) { + /* Two devices responded to a transaction request. Must be resolved + by software. FIXME: Reset ports? */ + panic("Bus error for epid %d." + " Two devices responded to transaction request", + epid); + + } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, buffer_error)) { + /* DMA overrun or underrun. */ + warn("Buffer overrun/underrun for epid %d. DMA too busy?", epid); + + /* It seems that error_code = buffer_error in + R_USB_EPT_DATA/R_USB_EPT_DATA_ISO and ourun = yes in R_USB_STATUS + are the same error. */ + } +} + + +static void etrax_usb_add_to_isoc_sb_list(struct urb *urb, int epid) +{ + + int i = 0; + + etrax_urb_priv_t *urb_priv; + USB_SB_Desc_t *prev_sb_desc, *next_sb_desc, *temp_sb_desc; + + DBFENTER; + + prev_sb_desc = next_sb_desc = temp_sb_desc = NULL; + + urb_priv = kmalloc(sizeof(etrax_urb_priv_t), GFP_ATOMIC); + assert(urb_priv != NULL); + memset(urb_priv, 0, sizeof(etrax_urb_priv_t)); + + urb->hcpriv = urb_priv; + urb_priv->epid = epid; + + if (usb_pipeout(urb->pipe)) { + + if (urb->number_of_packets == 0) panic("etrax_usb_add_to_isoc_sb_list 0 packets\n"); + + dbg_isoc("Transfer for epid %d is OUT", epid); + dbg_isoc("%d packets in URB", urb->number_of_packets); + + /* Create one SB descriptor for each packet and link them together. */ + for (i = 0; i < urb->number_of_packets; i++) { + if (!urb->iso_frame_desc[i].length) + continue; + + next_sb_desc = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_ATOMIC); + assert(next_sb_desc != NULL); + + if (urb->iso_frame_desc[i].length > 0) { + + next_sb_desc->command = (IO_STATE(USB_SB_command, tt, out) | + IO_STATE(USB_SB_command, eot, yes)); + + next_sb_desc->sw_len = urb->iso_frame_desc[i].length; + next_sb_desc->buf = virt_to_phys((char*)urb->transfer_buffer + urb->iso_frame_desc[i].offset); + + /* Check if full length transfer. */ + if (urb->iso_frame_desc[i].length == + usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe))) { + next_sb_desc->command |= IO_STATE(USB_SB_command, full, yes); + } + } else { + dbg_isoc("zero len packet"); + next_sb_desc->command = (IO_FIELD(USB_SB_command, rem, 0) | + IO_STATE(USB_SB_command, tt, zout) | + IO_STATE(USB_SB_command, eot, yes) | + IO_STATE(USB_SB_command, full, yes)); + + next_sb_desc->sw_len = 1; + next_sb_desc->buf = virt_to_phys(&zout_buffer[0]); + } + + /* First SB descriptor that belongs to this urb */ + if (i == 0) + urb_priv->first_sb = next_sb_desc; + else + prev_sb_desc->next = virt_to_phys(next_sb_desc); + + prev_sb_desc = next_sb_desc; + } + + next_sb_desc->command |= (IO_STATE(USB_SB_command, intr, yes) | + IO_STATE(USB_SB_command, eol, yes)); + next_sb_desc->next = 0; + urb_priv->last_sb = next_sb_desc; + + } else if (usb_pipein(urb->pipe)) { + + dbg_isoc("Transfer for epid %d is IN", epid); + dbg_isoc("transfer_buffer_length = %d", urb->transfer_buffer_length); + dbg_isoc("rem is calculated to %d", urb->iso_frame_desc[urb->number_of_packets - 1].length); + + /* Note that in descriptors for periodic traffic are not consumed. This means that + the USB controller never propagates in the SB list. In other words, if there already + is an SB descriptor in the list for this EP we don't have to do anything. */ + if (TxIsocEPList[epid].sub == 0) { + dbg_isoc("Isoc traffic not already running, allocating SB"); + + next_sb_desc = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_ATOMIC); + assert(next_sb_desc != NULL); + + next_sb_desc->command = (IO_STATE(USB_SB_command, tt, in) | + IO_STATE(USB_SB_command, eot, yes) | + IO_STATE(USB_SB_command, eol, yes)); + + next_sb_desc->next = 0; + next_sb_desc->sw_len = 1; /* Actual number of packets is not relevant + for periodic in traffic as long as it is more + than zero. Set to 1 always. */ + next_sb_desc->buf = 0; + + /* The rem field is don't care for isoc traffic, so we don't set it. */ + + /* Only one SB descriptor that belongs to this urb. */ + urb_priv->first_sb = next_sb_desc; + urb_priv->last_sb = next_sb_desc; + + } else { + + dbg_isoc("Isoc traffic already running, just setting first/last_sb"); + + /* Each EP for isoc in will have only one SB descriptor, setup when submitting the + already active urb. Note that even though we may have several first_sb/last_sb + pointing at the same SB descriptor, they are freed only once (when the list has + become empty). */ + urb_priv->first_sb = phys_to_virt(TxIsocEPList[epid].sub); + urb_priv->last_sb = phys_to_virt(TxIsocEPList[epid].sub); + return; + } + + } + + /* Find the spot to insert this urb and add it. */ + if (TxIsocEPList[epid].sub == 0) { + /* First SB descriptor inserted in this list (in or out). */ + dbg_isoc("Inserting SB desc first in list"); + TxIsocEPList[epid].hw_len = 0; + TxIsocEPList[epid].sub = virt_to_phys(urb_priv->first_sb); + + } else { + /* Isochronous traffic is already running, insert new traffic last (only out). */ + dbg_isoc("Inserting SB desc last in list"); + temp_sb_desc = phys_to_virt(TxIsocEPList[epid].sub); + while ((temp_sb_desc->command & IO_MASK(USB_SB_command, eol)) != + IO_STATE(USB_SB_command, eol, yes)) { + assert(temp_sb_desc->next); + temp_sb_desc = phys_to_virt(temp_sb_desc->next); + } + dbg_isoc("Appending list on desc 0x%p", temp_sb_desc); + + /* Next pointer must be set before eol is removed. */ + temp_sb_desc->next = virt_to_phys(urb_priv->first_sb); + /* Clear the previous end of list flag since there is a new in the + added SB descriptor list. */ + temp_sb_desc->command &= ~IO_MASK(USB_SB_command, eol); + + if (!(TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable))) { + /* 8.8.5 in Designer's Reference says we should check for and correct + any errors in the EP here. That should not be necessary if epid_attn + is handled correctly, so we assume all is ok. */ + dbg_isoc("EP disabled"); + etrax_usb_check_error_isoc_ep(epid); + + /* The SB list was exhausted. */ + if (virt_to_phys(urb_priv->last_sb) != TxIsocEPList[epid].sub) { + /* The new sublist did not get processed before the EP was + disabled. Setup the EP again. */ + dbg_isoc("Set EP sub to new list"); + TxIsocEPList[epid].hw_len = 0; + TxIsocEPList[epid].sub = virt_to_phys(urb_priv->first_sb); + } + } + } + + if (urb->transfer_flags & URB_ISO_ASAP) { + /* The isoc transfer should be started as soon as possible. The start_frame + field is a return value if URB_ISO_ASAP was set. Comparing R_USB_FM_NUMBER + with a USB Chief trace shows that the first isoc IN token is sent 2 frames + later. I'm not sure how this affects usage of the start_frame field by the + device driver, or how it affects things when USB_ISO_ASAP is not set, so + therefore there's no compensation for the 2 frame "lag" here. */ + urb->start_frame = (*R_USB_FM_NUMBER & 0x7ff); + TxIsocEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes); + urb_priv->urb_state = STARTED; + dbg_isoc("URB_ISO_ASAP set, urb->start_frame set to %d", urb->start_frame); + } else { + /* Not started yet. */ + urb_priv->urb_state = NOT_STARTED; + dbg_isoc("urb_priv->urb_state set to NOT_STARTED"); + } + + /* We start the DMA sub channel without checking if it's running or not, because: + 1) If it's already running, issuing the start command is a nop. + 2) We avoid a test-and-set race condition. */ + *R_DMA_CH8_SUB3_CMD = IO_STATE(R_DMA_CH8_SUB3_CMD, cmd, start); + + DBFEXIT; +} + +static void etrax_usb_complete_isoc_urb(struct urb *urb, int status) +{ + etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv; + int epid = urb_priv->epid; + int auto_resubmit = 0; + + DBFENTER; + dbg_isoc("complete urb 0x%p, status %d", urb, status); + + if (status) + warn("Completing isoc urb with status %d.", status); + + if (usb_pipein(urb->pipe)) { + int i; + + /* Make that all isoc packets have status and length set before + completing the urb. */ + for (i = urb_priv->isoc_packet_counter; i < urb->number_of_packets; i++) { + urb->iso_frame_desc[i].actual_length = 0; + urb->iso_frame_desc[i].status = -EPROTO; + } + + urb_list_del(urb, epid); + + if (!list_empty(&urb_list[epid])) { + ((etrax_urb_priv_t *)(urb_list_first(epid)->hcpriv))->urb_state = STARTED; + } else { + unsigned long int flags; + if (TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable)) { + /* The EP was enabled, disable it and wait. */ + TxIsocEPList[epid].command &= ~IO_MASK(USB_EP_command, enable); + + /* Ah, the luxury of busy-wait. */ + while (*R_DMA_CH8_SUB3_EP == virt_to_phys(&TxIsocEPList[epid])); + } + + etrax_remove_from_sb_list(urb); + TxIsocEPList[epid].sub = 0; + TxIsocEPList[epid].hw_len = 0; + + save_flags(flags); + cli(); + etrax_usb_free_epid(epid); + restore_flags(flags); + } + + urb->hcpriv = 0; + kfree(urb_priv); + + /* Release allocated bandwidth. */ + usb_release_bandwidth(urb->dev, urb, 0); + } else if (usb_pipeout(urb->pipe)) { + int freed_descr; + + dbg_isoc("Isoc out urb complete 0x%p", urb); + + /* Update the urb list. */ + urb_list_del(urb, epid); + + freed_descr = etrax_remove_from_sb_list(urb); + dbg_isoc("freed %d descriptors of %d packets", freed_descr, urb->number_of_packets); + assert(freed_descr == urb->number_of_packets); + urb->hcpriv = 0; + kfree(urb_priv); + + /* Release allocated bandwidth. */ + usb_release_bandwidth(urb->dev, urb, 0); + } + + urb->status = status; + if (urb->complete) { + urb->complete(urb, NULL); + } + + if (auto_resubmit) { + /* Check that urb was not unlinked by the complete callback. */ + if (__urb_list_entry(urb, epid)) { + /* Move this one down the list. */ + urb_list_move_last(urb, epid); + + /* Mark the now first urb as started (may already be). */ + ((etrax_urb_priv_t *)(urb_list_first(epid)->hcpriv))->urb_state = STARTED; + + /* Must set this to 0 since this urb is still active after + completion. */ + urb_priv->isoc_packet_counter = 0; + } else { + warn("(ISOC) automatic resubmit urb 0x%p removed by complete.", urb); + } + } + + DBFEXIT; +} + +static void etrax_usb_complete_urb(struct urb *urb, int status) +{ + switch (usb_pipetype(urb->pipe)) { + case PIPE_BULK: + etrax_usb_complete_bulk_urb(urb, status); + break; + case PIPE_CONTROL: + etrax_usb_complete_ctrl_urb(urb, status); + break; + case PIPE_INTERRUPT: + etrax_usb_complete_intr_urb(urb, status); + break; + case PIPE_ISOCHRONOUS: + etrax_usb_complete_isoc_urb(urb, status); + break; + default: + err("Unknown pipetype"); + } +} + + + +static irqreturn_t etrax_usb_hc_interrupt_top_half(int irq, void *vhc, struct pt_regs *regs) +{ + usb_interrupt_registers_t *reg; + unsigned long flags; + __u32 irq_mask; + __u8 status; + __u32 epid_attn; + __u16 port_status_1; + __u16 port_status_2; + __u32 fm_number; + + DBFENTER; + + /* Read critical registers into local variables, do kmalloc afterwards. */ + save_flags(flags); + cli(); + + irq_mask = *R_USB_IRQ_MASK_READ; + /* Reading R_USB_STATUS clears the ctl_status interrupt. Note that R_USB_STATUS + must be read before R_USB_EPID_ATTN since reading the latter clears the + ourun and perror fields of R_USB_STATUS. */ + status = *R_USB_STATUS; + + /* Reading R_USB_EPID_ATTN clears the iso_eof, bulk_eot and epid_attn interrupts. */ + epid_attn = *R_USB_EPID_ATTN; + + /* Reading R_USB_RH_PORT_STATUS_1 and R_USB_RH_PORT_STATUS_2 clears the + port_status interrupt. */ + port_status_1 = *R_USB_RH_PORT_STATUS_1; + port_status_2 = *R_USB_RH_PORT_STATUS_2; + + /* Reading R_USB_FM_NUMBER clears the sof interrupt. */ + /* Note: the lower 11 bits contain the actual frame number, sent with each sof. */ + fm_number = *R_USB_FM_NUMBER; + + restore_flags(flags); + + reg = (usb_interrupt_registers_t *)kmem_cache_alloc(top_half_reg_cache, SLAB_ATOMIC); + + assert(reg != NULL); + + reg->hc = (etrax_hc_t *)vhc; + + /* Now put register values into kmalloc'd area. */ + reg->r_usb_irq_mask_read = irq_mask; + reg->r_usb_status = status; + reg->r_usb_epid_attn = epid_attn; + reg->r_usb_rh_port_status_1 = port_status_1; + reg->r_usb_rh_port_status_2 = port_status_2; + reg->r_usb_fm_number = fm_number; + + INIT_WORK(®->usb_bh, etrax_usb_hc_interrupt_bottom_half, reg); + schedule_work(®->usb_bh); + + DBFEXIT; + + return IRQ_HANDLED; +} + +static void etrax_usb_hc_interrupt_bottom_half(void *data) +{ + usb_interrupt_registers_t *reg = (usb_interrupt_registers_t *)data; + __u32 irq_mask = reg->r_usb_irq_mask_read; + + DBFENTER; + + /* Interrupts are handled in order of priority. */ + if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, epid_attn)) { + etrax_usb_hc_epid_attn_interrupt(reg); + } + if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, port_status)) { + etrax_usb_hc_port_status_interrupt(reg); + } + if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, ctl_status)) { + etrax_usb_hc_ctl_status_interrupt(reg); + } + if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, iso_eof)) { + etrax_usb_hc_isoc_eof_interrupt(); + } + if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, bulk_eot)) { + /* Update/restart the bulk start timer since obviously the channel is running. */ + mod_timer(&bulk_start_timer, jiffies + BULK_START_TIMER_INTERVAL); + /* Update/restart the bulk eot timer since we just received an bulk eot interrupt. */ + mod_timer(&bulk_eot_timer, jiffies + BULK_EOT_TIMER_INTERVAL); + + etrax_usb_hc_bulk_eot_interrupt(0); + } + + kmem_cache_free(top_half_reg_cache, reg); + + DBFEXIT; +} + + +void etrax_usb_hc_isoc_eof_interrupt(void) +{ + struct urb *urb; + etrax_urb_priv_t *urb_priv; + int epid; + unsigned long flags; + + DBFENTER; + + /* Do not check the invalid epid (it has a valid sub pointer). */ + for (epid = 0; epid < NBR_OF_EPIDS - 1; epid++) { + + /* Do not check the invalid epid (it has a valid sub pointer). */ + if ((epid == DUMMY_EPID) || (epid == INVALID_EPID)) + continue; + + /* Disable interrupts to block the isoc out descriptor interrupt handler + from being called while the isoc EPID list is being checked. + */ + save_flags(flags); + cli(); + + if (TxIsocEPList[epid].sub == 0) { + /* Nothing here to see. */ + restore_flags(flags); + continue; + } + + /* Get the first urb (if any). */ + urb = urb_list_first(epid); + if (urb == 0) { + warn("Ignoring NULL urb"); + restore_flags(flags); + continue; + } + if (usb_pipein(urb->pipe)) { + + /* Sanity check. */ + assert(usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS); + + urb_priv = (etrax_urb_priv_t *)urb->hcpriv; + assert(urb_priv); + + if (urb_priv->urb_state == NOT_STARTED) { + + /* If ASAP is not set and urb->start_frame is the current frame, + start the transfer. */ + if (!(urb->transfer_flags & URB_ISO_ASAP) && + (urb->start_frame == (*R_USB_FM_NUMBER & 0x7ff))) { + + dbg_isoc("Enabling isoc IN EP descr for epid %d", epid); + TxIsocEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes); + + /* This urb is now active. */ + urb_priv->urb_state = STARTED; + continue; + } + } + } + restore_flags(flags); + } + + DBFEXIT; + +} + +void etrax_usb_hc_bulk_eot_interrupt(int timer_induced) +{ + int epid; + + /* The technique is to run one urb at a time, wait for the eot interrupt at which + point the EP descriptor has been disabled. */ + + DBFENTER; + dbg_bulk("bulk eot%s", timer_induced ? ", called by timer" : ""); + + for (epid = 0; epid < NBR_OF_EPIDS; epid++) { + + if (!(TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)) && + (TxBulkEPList[epid].sub != 0)) { + + struct urb *urb; + etrax_urb_priv_t *urb_priv; + unsigned long flags; + __u32 r_usb_ept_data; + + /* Found a disabled EP descriptor which has a non-null sub pointer. + Verify that this ctrl EP descriptor got disabled no errors. + FIXME: Necessary to check error_code? */ + dbg_bulk("for epid %d?", epid); + + /* Get the first urb. */ + urb = urb_list_first(epid); + + /* FIXME: Could this happen for valid reasons? Why did it disappear? Because of + wrong unlinking? */ + if (!urb) { + warn("NULL urb for epid %d", epid); + continue; + } + + assert(urb); + urb_priv = (etrax_urb_priv_t *)urb->hcpriv; + assert(urb_priv); + + /* Sanity checks. */ + assert(usb_pipetype(urb->pipe) == PIPE_BULK); + if (phys_to_virt(TxBulkEPList[epid].sub) != urb_priv->last_sb) { + err("bulk endpoint got disabled before reaching last sb"); + } + + /* For bulk IN traffic, there seems to be a race condition between + between the bulk eot and eop interrupts, or rather an uncertainty regarding + the order in which they happen. Normally we expect the eop interrupt from + DMA channel 9 to happen before the eot interrupt. + + Therefore, we complete the bulk IN urb in the rx interrupt handler instead. */ + + if (usb_pipein(urb->pipe)) { + dbg_bulk("in urb, continuing"); + continue; + } + + save_flags(flags); + cli(); + *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid); + nop(); + r_usb_ept_data = *R_USB_EPT_DATA; + restore_flags(flags); + + if (IO_EXTRACT(R_USB_EPT_DATA, error_code, r_usb_ept_data) == + IO_STATE_VALUE(R_USB_EPT_DATA, error_code, no_error)) { + /* This means that the endpoint has no error, is disabled + and had inserted traffic, i.e. transfer successfully completed. */ + etrax_usb_complete_bulk_urb(urb, 0); + } else { + /* Shouldn't happen. We expect errors to be caught by epid attention. */ + err("Found disabled bulk EP desc, error_code != no_error"); + } + } + } + + /* Normally, we should find (at least) one disabled EP descriptor with a valid sub pointer. + However, because of the uncertainty in the deliverance of the eop/eot interrupts, we may + not. Also, we might find two disabled EPs when handling an eot interrupt, and then find + none the next time. */ + + DBFEXIT; + +} + +void etrax_usb_hc_epid_attn_interrupt(usb_interrupt_registers_t *reg) +{ + /* This function handles the epid attention interrupt. There are a variety of reasons + for this interrupt to happen (Designer's Reference, p. 8 - 22 for the details): + + invalid ep_id - Invalid epid in an EP (EP disabled). + stall - Not strictly an error condition (EP disabled). + 3rd error - Three successive transaction errors (EP disabled). + buffer ourun - Buffer overrun or underrun (EP disabled). + past eof1 - Intr or isoc transaction proceeds past EOF1. + near eof - Intr or isoc transaction would not fit inside the frame. + zout transfer - If zout transfer for a bulk endpoint (EP disabled). + setup transfer - If setup transfer for a non-ctrl endpoint (EP disabled). */ + + int epid; + + + DBFENTER; + + assert(reg != NULL); + + /* Note that we loop through all epids. We still want to catch errors for + the invalid one, even though we might handle them differently. */ + for (epid = 0; epid < NBR_OF_EPIDS; epid++) { + + if (test_bit(epid, (void *)®->r_usb_epid_attn)) { + + struct urb *urb; + __u32 r_usb_ept_data; + unsigned long flags; + int error_code; + + save_flags(flags); + cli(); + *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid); + nop(); + /* Note that although there are separate R_USB_EPT_DATA and R_USB_EPT_DATA_ISO + registers, they are located at the same address and are of the same size. + In other words, this read should be ok for isoc also. */ + r_usb_ept_data = *R_USB_EPT_DATA; + restore_flags(flags); + + /* First some sanity checks. */ + if (epid == INVALID_EPID) { + /* FIXME: What if it became disabled? Could seriously hurt interrupt + traffic. (Use do_intr_recover.) */ + warn("Got epid_attn for INVALID_EPID (%d).", epid); + err("R_USB_EPT_DATA = 0x%x", r_usb_ept_data); + err("R_USB_STATUS = 0x%x", reg->r_usb_status); + continue; + } else if (epid == DUMMY_EPID) { + /* We definitely don't care about these ones. Besides, they are + always disabled, so any possible disabling caused by the + epid attention interrupt is irrelevant. */ + warn("Got epid_attn for DUMMY_EPID (%d).", epid); + continue; + } + + /* Get the first urb in the urb list for this epid. We blatantly assume + that only the first urb could have caused the epid attention. + (For bulk and ctrl, only one urb is active at any one time. For intr + and isoc we remove them once they are completed.) */ + urb = urb_list_first(epid); + + if (urb == NULL) { + err("Got epid_attn for epid %i with no urb.", epid); + err("R_USB_EPT_DATA = 0x%x", r_usb_ept_data); + err("R_USB_STATUS = 0x%x", reg->r_usb_status); + continue; + } + + switch (usb_pipetype(urb->pipe)) { + case PIPE_BULK: + warn("Got epid attn for bulk endpoint, epid %d", epid); + break; + case PIPE_CONTROL: + warn("Got epid attn for control endpoint, epid %d", epid); + break; + case PIPE_INTERRUPT: + warn("Got epid attn for interrupt endpoint, epid %d", epid); + break; + case PIPE_ISOCHRONOUS: + warn("Got epid attn for isochronous endpoint, epid %d", epid); + break; + } + + if (usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS) { + if (r_usb_ept_data & IO_MASK(R_USB_EPT_DATA, hold)) { + warn("Hold was set for epid %d.", epid); + continue; + } + } + + /* Even though error_code occupies bits 22 - 23 in both R_USB_EPT_DATA and + R_USB_EPT_DATA_ISOC, we separate them here so we don't forget in other places. */ + if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { + error_code = IO_EXTRACT(R_USB_EPT_DATA_ISO, error_code, r_usb_ept_data); + } else { + error_code = IO_EXTRACT(R_USB_EPT_DATA, error_code, r_usb_ept_data); + } + + /* Using IO_STATE_VALUE on R_USB_EPT_DATA should be ok for isoc also. */ + if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, no_error)) { + + /* Isoc traffic doesn't have error_count_in/error_count_out. */ + if ((usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS) && + (IO_EXTRACT(R_USB_EPT_DATA, error_count_in, r_usb_ept_data) == 3 || + IO_EXTRACT(R_USB_EPT_DATA, error_count_out, r_usb_ept_data) == 3)) { + /* 3rd error. */ + warn("3rd error for epid %i", epid); + etrax_usb_complete_urb(urb, -EPROTO); + + } else if (reg->r_usb_status & IO_MASK(R_USB_STATUS, perror)) { + + warn("Perror for epid %d", epid); + + if (!(r_usb_ept_data & IO_MASK(R_USB_EPT_DATA, valid))) { + /* invalid ep_id */ + panic("Perror because of invalid epid." + " Deconfigured too early?"); + } else { + /* past eof1, near eof, zout transfer, setup transfer */ + + /* Dump the urb and the relevant EP descriptor list. */ + + __dump_urb(urb); + __dump_ept_data(epid); + __dump_ep_list(usb_pipetype(urb->pipe)); + + panic("Something wrong with DMA descriptor contents." + " Too much traffic inserted?"); + } + } else if (reg->r_usb_status & IO_MASK(R_USB_STATUS, ourun)) { + /* buffer ourun */ + panic("Buffer overrun/underrun for epid %d. DMA too busy?", epid); + } + + } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, stall)) { + /* Not really a protocol error, just says that the endpoint gave + a stall response. Note that error_code cannot be stall for isoc. */ + if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { + panic("Isoc traffic cannot stall"); + } + + warn("Stall for epid %d", epid); + etrax_usb_complete_urb(urb, -EPIPE); + + } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, bus_error)) { + /* Two devices responded to a transaction request. Must be resolved + by software. FIXME: Reset ports? */ + panic("Bus error for epid %d." + " Two devices responded to transaction request", + epid); + + } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, buffer_error)) { + /* DMA overrun or underrun. */ + warn("Buffer overrun/underrun for epid %d. DMA too busy?", epid); + + /* It seems that error_code = buffer_error in + R_USB_EPT_DATA/R_USB_EPT_DATA_ISO and ourun = yes in R_USB_STATUS + are the same error. */ + etrax_usb_complete_urb(urb, -EPROTO); + } + } + } + + DBFEXIT; + +} + +void etrax_usb_bulk_start_timer_func(unsigned long dummy) +{ + + /* We might enable an EP descriptor behind the current DMA position when it's about + to decide that there are no more bulk traffic and it should stop the bulk channel. + Therefore we periodically check if the bulk channel is stopped and there is an + enabled bulk EP descriptor, in which case we start the bulk channel. */ + dbg_bulk("bulk_start_timer timed out."); + + if (!(*R_DMA_CH8_SUB0_CMD & IO_MASK(R_DMA_CH8_SUB0_CMD, cmd))) { + int epid; + + dbg_bulk("Bulk DMA channel not running."); + + for (epid = 0; epid < NBR_OF_EPIDS; epid++) { + if (TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)) { + dbg_bulk("Found enabled EP for epid %d, starting bulk channel.\n", + epid); + *R_DMA_CH8_SUB0_CMD = IO_STATE(R_DMA_CH8_SUB0_CMD, cmd, start); + + /* Restart the bulk eot timer since we just started the bulk channel. */ + mod_timer(&bulk_eot_timer, jiffies + BULK_EOT_TIMER_INTERVAL); + + /* No need to search any further. */ + break; + } + } + } else { + dbg_bulk("Bulk DMA channel running."); + } +} + +void etrax_usb_hc_port_status_interrupt(usb_interrupt_registers_t *reg) +{ + etrax_hc_t *hc = reg->hc; + __u16 r_usb_rh_port_status_1 = reg->r_usb_rh_port_status_1; + __u16 r_usb_rh_port_status_2 = reg->r_usb_rh_port_status_2; + + DBFENTER; + + /* The Etrax RH does not include a wPortChange register, so this has to be handled in software + (by saving the old port status value for comparison when the port status interrupt happens). + See section 11.16.2.6.2 in the USB 1.1 spec for details. */ + + dbg_rh("hc->rh.prev_wPortStatus_1 = 0x%x", hc->rh.prev_wPortStatus_1); + dbg_rh("hc->rh.prev_wPortStatus_2 = 0x%x", hc->rh.prev_wPortStatus_2); + dbg_rh("r_usb_rh_port_status_1 = 0x%x", r_usb_rh_port_status_1); + dbg_rh("r_usb_rh_port_status_2 = 0x%x", r_usb_rh_port_status_2); + + /* C_PORT_CONNECTION is set on any transition. */ + hc->rh.wPortChange_1 |= + ((r_usb_rh_port_status_1 & (1 << RH_PORT_CONNECTION)) != + (hc->rh.prev_wPortStatus_1 & (1 << RH_PORT_CONNECTION))) ? + (1 << RH_PORT_CONNECTION) : 0; + + hc->rh.wPortChange_2 |= + ((r_usb_rh_port_status_2 & (1 << RH_PORT_CONNECTION)) != + (hc->rh.prev_wPortStatus_2 & (1 << RH_PORT_CONNECTION))) ? + (1 << RH_PORT_CONNECTION) : 0; + + /* C_PORT_ENABLE is _only_ set on a one to zero transition, i.e. when + the port is disabled, not when it's enabled. */ + hc->rh.wPortChange_1 |= + ((hc->rh.prev_wPortStatus_1 & (1 << RH_PORT_ENABLE)) + && !(r_usb_rh_port_status_1 & (1 << RH_PORT_ENABLE))) ? + (1 << RH_PORT_ENABLE) : 0; + + hc->rh.wPortChange_2 |= + ((hc->rh.prev_wPortStatus_2 & (1 << RH_PORT_ENABLE)) + && !(r_usb_rh_port_status_2 & (1 << RH_PORT_ENABLE))) ? + (1 << RH_PORT_ENABLE) : 0; + + /* C_PORT_SUSPEND is set to one when the device has transitioned out + of the suspended state, i.e. when suspend goes from one to zero. */ + hc->rh.wPortChange_1 |= + ((hc->rh.prev_wPortStatus_1 & (1 << RH_PORT_SUSPEND)) + && !(r_usb_rh_port_status_1 & (1 << RH_PORT_SUSPEND))) ? + (1 << RH_PORT_SUSPEND) : 0; + + hc->rh.wPortChange_2 |= + ((hc->rh.prev_wPortStatus_2 & (1 << RH_PORT_SUSPEND)) + && !(r_usb_rh_port_status_2 & (1 << RH_PORT_SUSPEND))) ? + (1 << RH_PORT_SUSPEND) : 0; + + + /* C_PORT_RESET is set when reset processing on this port is complete. */ + hc->rh.wPortChange_1 |= + ((hc->rh.prev_wPortStatus_1 & (1 << RH_PORT_RESET)) + && !(r_usb_rh_port_status_1 & (1 << RH_PORT_RESET))) ? + (1 << RH_PORT_RESET) : 0; + + hc->rh.wPortChange_2 |= + ((hc->rh.prev_wPortStatus_2 & (1 << RH_PORT_RESET)) + && !(r_usb_rh_port_status_2 & (1 << RH_PORT_RESET))) ? + (1 << RH_PORT_RESET) : 0; + + /* Save the new values for next port status change. */ + hc->rh.prev_wPortStatus_1 = r_usb_rh_port_status_1; + hc->rh.prev_wPortStatus_2 = r_usb_rh_port_status_2; + + dbg_rh("hc->rh.wPortChange_1 set to 0x%x", hc->rh.wPortChange_1); + dbg_rh("hc->rh.wPortChange_2 set to 0x%x", hc->rh.wPortChange_2); + + DBFEXIT; + +} + +void etrax_usb_hc_ctl_status_interrupt(usb_interrupt_registers_t *reg) +{ + DBFENTER; + + /* FIXME: What should we do if we get ourun or perror? Dump the EP and SB + list for the corresponding epid? */ + if (reg->r_usb_status & IO_MASK(R_USB_STATUS, ourun)) { + panic("USB controller got ourun."); + } + if (reg->r_usb_status & IO_MASK(R_USB_STATUS, perror)) { + + /* Before, etrax_usb_do_intr_recover was called on this epid if it was + an interrupt pipe. I don't see how re-enabling all EP descriptors + will help if there was a programming error. */ + panic("USB controller got perror."); + } + + if (reg->r_usb_status & IO_MASK(R_USB_STATUS, device_mode)) { + /* We should never operate in device mode. */ + panic("USB controller in device mode."); + } + + /* These if-statements could probably be nested. */ + if (reg->r_usb_status & IO_MASK(R_USB_STATUS, host_mode)) { + info("USB controller in host mode."); + } + if (reg->r_usb_status & IO_MASK(R_USB_STATUS, started)) { + info("USB controller started."); + } + if (reg->r_usb_status & IO_MASK(R_USB_STATUS, running)) { + info("USB controller running."); + } + + DBFEXIT; + +} + + +static int etrax_rh_submit_urb(struct urb *urb) +{ + struct usb_device *usb_dev = urb->dev; + etrax_hc_t *hc = usb_dev->bus->hcpriv; + unsigned int pipe = urb->pipe; + struct usb_ctrlrequest *cmd = (struct usb_ctrlrequest *) urb->setup_packet; + void *data = urb->transfer_buffer; + int leni = urb->transfer_buffer_length; + int len = 0; + int stat = 0; + + __u16 bmRType_bReq; + __u16 wValue; + __u16 wIndex; + __u16 wLength; + + DBFENTER; + + /* FIXME: What is this interrupt urb that is sent to the root hub? */ + if (usb_pipetype (pipe) == PIPE_INTERRUPT) { + dbg_rh("Root-Hub submit IRQ: every %d ms", urb->interval); + hc->rh.urb = urb; + hc->rh.send = 1; + /* FIXME: We could probably remove this line since it's done + in etrax_rh_init_int_timer. (Don't remove it from + etrax_rh_init_int_timer though.) */ + hc->rh.interval = urb->interval; + etrax_rh_init_int_timer(urb); + DBFEXIT; + + return 0; + } + + bmRType_bReq = cmd->bRequestType | (cmd->bRequest << 8); + wValue = le16_to_cpu(cmd->wValue); + wIndex = le16_to_cpu(cmd->wIndex); + wLength = le16_to_cpu(cmd->wLength); + + dbg_rh("bmRType_bReq : 0x%04x (%d)", bmRType_bReq, bmRType_bReq); + dbg_rh("wValue : 0x%04x (%d)", wValue, wValue); + dbg_rh("wIndex : 0x%04x (%d)", wIndex, wIndex); + dbg_rh("wLength : 0x%04x (%d)", wLength, wLength); + + switch (bmRType_bReq) { + + /* Request Destination: + without flags: Device, + RH_INTERFACE: interface, + RH_ENDPOINT: endpoint, + RH_CLASS means HUB here, + RH_OTHER | RH_CLASS almost ever means HUB_PORT here + */ + + case RH_GET_STATUS: + *(__u16 *) data = cpu_to_le16 (1); + OK (2); + + case RH_GET_STATUS | RH_INTERFACE: + *(__u16 *) data = cpu_to_le16 (0); + OK (2); + + case RH_GET_STATUS | RH_ENDPOINT: + *(__u16 *) data = cpu_to_le16 (0); + OK (2); + + case RH_GET_STATUS | RH_CLASS: + *(__u32 *) data = cpu_to_le32 (0); + OK (4); /* hub power ** */ + + case RH_GET_STATUS | RH_OTHER | RH_CLASS: + if (wIndex == 1) { + *((__u16*)data) = cpu_to_le16(hc->rh.prev_wPortStatus_1); + *((__u16*)data + 1) = cpu_to_le16(hc->rh.wPortChange_1); + } else if (wIndex == 2) { + *((__u16*)data) = cpu_to_le16(hc->rh.prev_wPortStatus_2); + *((__u16*)data + 1) = cpu_to_le16(hc->rh.wPortChange_2); + } else { + dbg_rh("RH_GET_STATUS whith invalid wIndex!"); + OK(0); + } + + OK(4); + + case RH_CLEAR_FEATURE | RH_ENDPOINT: + switch (wValue) { + case (RH_ENDPOINT_STALL): + OK (0); + } + break; + + case RH_CLEAR_FEATURE | RH_CLASS: + switch (wValue) { + case (RH_C_HUB_OVER_CURRENT): + OK (0); /* hub power over current ** */ + } + break; + + case RH_CLEAR_FEATURE | RH_OTHER | RH_CLASS: + switch (wValue) { + case (RH_PORT_ENABLE): + if (wIndex == 1) { + + dbg_rh("trying to do disable port 1"); + + *R_USB_PORT1_DISABLE = IO_STATE(R_USB_PORT1_DISABLE, disable, yes); + + while (hc->rh.prev_wPortStatus_1 & + IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, yes)); + *R_USB_PORT1_DISABLE = IO_STATE(R_USB_PORT1_DISABLE, disable, no); + dbg_rh("Port 1 is disabled"); + + } else if (wIndex == 2) { + + dbg_rh("trying to do disable port 2"); + + *R_USB_PORT2_DISABLE = IO_STATE(R_USB_PORT2_DISABLE, disable, yes); + + while (hc->rh.prev_wPortStatus_2 & + IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, yes)); + *R_USB_PORT2_DISABLE = IO_STATE(R_USB_PORT2_DISABLE, disable, no); + dbg_rh("Port 2 is disabled"); + + } else { + dbg_rh("RH_CLEAR_FEATURE->RH_PORT_ENABLE " + "with invalid wIndex == %d!", wIndex); + } + + OK (0); + case (RH_PORT_SUSPEND): + /* Opposite to suspend should be resume, so we'll do a resume. */ + /* FIXME: USB 1.1, 11.16.2.2 says: + "Clearing the PORT_SUSPEND feature causes a host-initiated resume + on the specified port. If the port is not in the Suspended state, + the hub should treat this request as a functional no-operation." + Shouldn't we check if the port is in a suspended state before + resuming? */ + + /* Make sure the controller isn't busy. */ + while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy)); + + if (wIndex == 1) { + *R_USB_COMMAND = + IO_STATE(R_USB_COMMAND, port_sel, port1) | + IO_STATE(R_USB_COMMAND, port_cmd, resume) | + IO_STATE(R_USB_COMMAND, ctrl_cmd, nop); + } else if (wIndex == 2) { + *R_USB_COMMAND = + IO_STATE(R_USB_COMMAND, port_sel, port2) | + IO_STATE(R_USB_COMMAND, port_cmd, resume) | + IO_STATE(R_USB_COMMAND, ctrl_cmd, nop); + } else { + dbg_rh("RH_CLEAR_FEATURE->RH_PORT_SUSPEND " + "with invalid wIndex == %d!", wIndex); + } + + OK (0); + case (RH_PORT_POWER): + OK (0); /* port power ** */ + case (RH_C_PORT_CONNECTION): + if (wIndex == 1) { + hc->rh.wPortChange_1 &= ~(1 << RH_PORT_CONNECTION); + } else if (wIndex == 2) { + hc->rh.wPortChange_2 &= ~(1 << RH_PORT_CONNECTION); + } else { + dbg_rh("RH_CLEAR_FEATURE->RH_C_PORT_CONNECTION " + "with invalid wIndex == %d!", wIndex); + } + + OK (0); + case (RH_C_PORT_ENABLE): + if (wIndex == 1) { + hc->rh.wPortChange_1 &= ~(1 << RH_PORT_ENABLE); + } else if (wIndex == 2) { + hc->rh.wPortChange_2 &= ~(1 << RH_PORT_ENABLE); + } else { + dbg_rh("RH_CLEAR_FEATURE->RH_C_PORT_ENABLE " + "with invalid wIndex == %d!", wIndex); + } + OK (0); + case (RH_C_PORT_SUSPEND): +/*** WR_RH_PORTSTAT(RH_PS_PSSC); */ + OK (0); + case (RH_C_PORT_OVER_CURRENT): + OK (0); /* port power over current ** */ + case (RH_C_PORT_RESET): + if (wIndex == 1) { + hc->rh.wPortChange_1 &= ~(1 << RH_PORT_RESET); + } else if (wIndex == 2) { + hc->rh.wPortChange_2 &= ~(1 << RH_PORT_RESET); + } else { + dbg_rh("RH_CLEAR_FEATURE->RH_C_PORT_RESET " + "with invalid index == %d!", wIndex); + } + + OK (0); + + } + break; + + case RH_SET_FEATURE | RH_OTHER | RH_CLASS: + switch (wValue) { + case (RH_PORT_SUSPEND): + + /* Make sure the controller isn't busy. */ + while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy)); + + if (wIndex == 1) { + *R_USB_COMMAND = + IO_STATE(R_USB_COMMAND, port_sel, port1) | + IO_STATE(R_USB_COMMAND, port_cmd, suspend) | + IO_STATE(R_USB_COMMAND, ctrl_cmd, nop); + } else if (wIndex == 2) { + *R_USB_COMMAND = + IO_STATE(R_USB_COMMAND, port_sel, port2) | + IO_STATE(R_USB_COMMAND, port_cmd, suspend) | + IO_STATE(R_USB_COMMAND, ctrl_cmd, nop); + } else { + dbg_rh("RH_SET_FEATURE->RH_PORT_SUSPEND " + "with invalid wIndex == %d!", wIndex); + } + + OK (0); + case (RH_PORT_RESET): + if (wIndex == 1) { + + port_1_reset: + dbg_rh("Doing reset of port 1"); + + /* Make sure the controller isn't busy. */ + while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy)); + + *R_USB_COMMAND = + IO_STATE(R_USB_COMMAND, port_sel, port1) | + IO_STATE(R_USB_COMMAND, port_cmd, reset) | + IO_STATE(R_USB_COMMAND, ctrl_cmd, nop); + + /* We must wait at least 10 ms for the device to recover. + 15 ms should be enough. */ + udelay(15000); + + /* Wait for reset bit to go low (should be done by now). */ + while (hc->rh.prev_wPortStatus_1 & + IO_STATE(R_USB_RH_PORT_STATUS_1, reset, yes)); + + /* If the port status is + 1) connected and enabled then there is a device and everything is fine + 2) neither connected nor enabled then there is no device, also fine + 3) connected and not enabled then we try again + (Yes, there are other port status combinations besides these.) */ + + if ((hc->rh.prev_wPortStatus_1 & + IO_STATE(R_USB_RH_PORT_STATUS_1, connected, yes)) && + (hc->rh.prev_wPortStatus_1 & + IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, no))) { + dbg_rh("Connected device on port 1, but port not enabled?" + " Trying reset again."); + goto port_2_reset; + } + + /* Diagnostic printouts. */ + if ((hc->rh.prev_wPortStatus_1 & + IO_STATE(R_USB_RH_PORT_STATUS_1, connected, no)) && + (hc->rh.prev_wPortStatus_1 & + IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, no))) { + dbg_rh("No connected device on port 1"); + } else if ((hc->rh.prev_wPortStatus_1 & + IO_STATE(R_USB_RH_PORT_STATUS_1, connected, yes)) && + (hc->rh.prev_wPortStatus_1 & + IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, yes))) { + dbg_rh("Connected device on port 1, port 1 enabled"); + } + + } else if (wIndex == 2) { + + port_2_reset: + dbg_rh("Doing reset of port 2"); + + /* Make sure the controller isn't busy. */ + while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy)); + + /* Issue the reset command. */ + *R_USB_COMMAND = + IO_STATE(R_USB_COMMAND, port_sel, port2) | + IO_STATE(R_USB_COMMAND, port_cmd, reset) | + IO_STATE(R_USB_COMMAND, ctrl_cmd, nop); + + /* We must wait at least 10 ms for the device to recover. + 15 ms should be enough. */ + udelay(15000); + + /* Wait for reset bit to go low (should be done by now). */ + while (hc->rh.prev_wPortStatus_2 & + IO_STATE(R_USB_RH_PORT_STATUS_2, reset, yes)); + + /* If the port status is + 1) connected and enabled then there is a device and everything is fine + 2) neither connected nor enabled then there is no device, also fine + 3) connected and not enabled then we try again + (Yes, there are other port status combinations besides these.) */ + + if ((hc->rh.prev_wPortStatus_2 & + IO_STATE(R_USB_RH_PORT_STATUS_2, connected, yes)) && + (hc->rh.prev_wPortStatus_2 & + IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, no))) { + dbg_rh("Connected device on port 2, but port not enabled?" + " Trying reset again."); + goto port_2_reset; + } + + /* Diagnostic printouts. */ + if ((hc->rh.prev_wPortStatus_2 & + IO_STATE(R_USB_RH_PORT_STATUS_2, connected, no)) && + (hc->rh.prev_wPortStatus_2 & + IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, no))) { + dbg_rh("No connected device on port 2"); + } else if ((hc->rh.prev_wPortStatus_2 & + IO_STATE(R_USB_RH_PORT_STATUS_2, connected, yes)) && + (hc->rh.prev_wPortStatus_2 & + IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, yes))) { + dbg_rh("Connected device on port 2, port 2 enabled"); + } + + } else { + dbg_rh("RH_SET_FEATURE->RH_PORT_RESET with invalid wIndex = %d", wIndex); + } + + /* Make sure the controller isn't busy. */ + while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy)); + + /* If all enabled ports were disabled the host controller goes down into + started mode, so we need to bring it back into the running state. + (This is safe even if it's already in the running state.) */ + *R_USB_COMMAND = + IO_STATE(R_USB_COMMAND, port_sel, nop) | + IO_STATE(R_USB_COMMAND, port_cmd, reset) | + IO_STATE(R_USB_COMMAND, ctrl_cmd, host_run); + + dbg_rh("...Done"); + OK(0); + + case (RH_PORT_POWER): + OK (0); /* port power ** */ + case (RH_PORT_ENABLE): + /* There is no port enable command in the host controller, so if the + port is already enabled, we do nothing. If not, we reset the port + (with an ugly goto). */ + + if (wIndex == 1) { + if (hc->rh.prev_wPortStatus_1 & + IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, no)) { + goto port_1_reset; + } + } else if (wIndex == 2) { + if (hc->rh.prev_wPortStatus_2 & + IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, no)) { + goto port_2_reset; + } + } else { + dbg_rh("RH_SET_FEATURE->RH_GET_STATUS with invalid wIndex = %d", wIndex); + } + OK (0); + } + break; + + case RH_SET_ADDRESS: + hc->rh.devnum = wValue; + dbg_rh("RH address set to: %d", hc->rh.devnum); + OK (0); + + case RH_GET_DESCRIPTOR: + switch ((wValue & 0xff00) >> 8) { + case (0x01): /* device descriptor */ + len = min_t(unsigned int, leni, min_t(unsigned int, sizeof (root_hub_dev_des), wLength)); + memcpy (data, root_hub_dev_des, len); + OK (len); + case (0x02): /* configuration descriptor */ + len = min_t(unsigned int, leni, min_t(unsigned int, sizeof (root_hub_config_des), wLength)); + memcpy (data, root_hub_config_des, len); + OK (len); + case (0x03): /* string descriptors */ + len = usb_root_hub_string (wValue & 0xff, + 0xff, "ETRAX 100LX", + data, wLength); + if (len > 0) { + OK(min(leni, len)); + } else { + stat = -EPIPE; + } + + } + break; + + case RH_GET_DESCRIPTOR | RH_CLASS: + root_hub_hub_des[2] = hc->rh.numports; + len = min_t(unsigned int, leni, min_t(unsigned int, sizeof (root_hub_hub_des), wLength)); + memcpy (data, root_hub_hub_des, len); + OK (len); + + case RH_GET_CONFIGURATION: + *(__u8 *) data = 0x01; + OK (1); + + case RH_SET_CONFIGURATION: + OK (0); + + default: + stat = -EPIPE; + } + + urb->actual_length = len; + urb->status = stat; + urb->dev = NULL; + if (urb->complete) { + urb->complete(urb, NULL); + } + DBFEXIT; + + return 0; +} + +static void +etrax_usb_bulk_eot_timer_func(unsigned long dummy) +{ + /* Because of a race condition in the top half, we might miss a bulk eot. + This timer "simulates" a bulk eot if we don't get one for a while, hopefully + correcting the situation. */ + dbg_bulk("bulk_eot_timer timed out."); + etrax_usb_hc_bulk_eot_interrupt(1); +} + +static void* +etrax_usb_buffer_alloc(struct usb_bus* bus, size_t size, int mem_flags, dma_addr_t *dma) +{ + return kmalloc(size, mem_flags); +} + +static void +etrax_usb_buffer_free(struct usb_bus *bus, size_t size, void *addr, dma_addr_t dma) +{ + kfree(addr); +} + + +static struct device fake_device; + +static int __init etrax_usb_hc_init(void) +{ + static etrax_hc_t *hc; + struct usb_bus *bus; + struct usb_device *usb_rh; + int i; + + DBFENTER; + + info("ETRAX 100LX USB-HCD %s (c) 2001-2003 Axis Communications AB\n", usb_hcd_version); + + hc = kmalloc(sizeof(etrax_hc_t), GFP_KERNEL); + assert(hc != NULL); + + /* We use kmem_cache_* to make sure that all DMA desc. are dword aligned */ + /* Note that we specify sizeof(USB_EP_Desc_t) as the size, but also allocate + SB descriptors from this cache. This is ok since sizeof(USB_EP_Desc_t) == + sizeof(USB_SB_Desc_t). */ + + usb_desc_cache = kmem_cache_create("usb_desc_cache", sizeof(USB_EP_Desc_t), 0, + SLAB_HWCACHE_ALIGN, 0, 0); + assert(usb_desc_cache != NULL); + + top_half_reg_cache = kmem_cache_create("top_half_reg_cache", + sizeof(usb_interrupt_registers_t), + 0, SLAB_HWCACHE_ALIGN, 0, 0); + assert(top_half_reg_cache != NULL); + + isoc_compl_cache = kmem_cache_create("isoc_compl_cache", + sizeof(usb_isoc_complete_data_t), + 0, SLAB_HWCACHE_ALIGN, 0, 0); + assert(isoc_compl_cache != NULL); + + etrax_usb_bus = bus = usb_alloc_bus(&etrax_usb_device_operations); + hc->bus = bus; + bus->bus_name="ETRAX 100LX"; + bus->hcpriv = hc; + + /* Initalize RH to the default address. + And make sure that we have no status change indication */ + hc->rh.numports = 2; /* The RH has two ports */ + hc->rh.devnum = 1; + hc->rh.wPortChange_1 = 0; + hc->rh.wPortChange_2 = 0; + + /* Also initate the previous values to zero */ + hc->rh.prev_wPortStatus_1 = 0; + hc->rh.prev_wPortStatus_2 = 0; + + /* Initialize the intr-traffic flags */ + /* FIXME: This isn't used. (Besides, the error field isn't initialized.) */ + hc->intr.sleeping = 0; + hc->intr.wq = NULL; + + epid_usage_bitmask = 0; + epid_out_traffic = 0; + + /* Mark the invalid epid as being used. */ + set_bit(INVALID_EPID, (void *)&epid_usage_bitmask); + *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, INVALID_EPID); + nop(); + /* The valid bit should still be set ('invalid' is in our world; not the hardware's). */ + *R_USB_EPT_DATA = (IO_STATE(R_USB_EPT_DATA, valid, yes) | + IO_FIELD(R_USB_EPT_DATA, max_len, 1)); + + /* Mark the dummy epid as being used. */ + set_bit(DUMMY_EPID, (void *)&epid_usage_bitmask); + *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, DUMMY_EPID); + nop(); + *R_USB_EPT_DATA = (IO_STATE(R_USB_EPT_DATA, valid, no) | + IO_FIELD(R_USB_EPT_DATA, max_len, 1)); + + /* Initialize the urb list by initiating a head for each list. */ + for (i = 0; i < NBR_OF_EPIDS; i++) { + INIT_LIST_HEAD(&urb_list[i]); + } + spin_lock_init(&urb_list_lock); + + INIT_LIST_HEAD(&urb_unlink_list); + + + /* Initiate the bulk start timer. */ + init_timer(&bulk_start_timer); + bulk_start_timer.expires = jiffies + BULK_START_TIMER_INTERVAL; + bulk_start_timer.function = etrax_usb_bulk_start_timer_func; + add_timer(&bulk_start_timer); + + + /* Initiate the bulk eot timer. */ + init_timer(&bulk_eot_timer); + bulk_eot_timer.expires = jiffies + BULK_EOT_TIMER_INTERVAL; + bulk_eot_timer.function = etrax_usb_bulk_eot_timer_func; + add_timer(&bulk_eot_timer); + + /* Set up the data structures for USB traffic. Note that this must be done before + any interrupt that relies on sane DMA list occurrs. */ + init_rx_buffers(); + init_tx_bulk_ep(); + init_tx_ctrl_ep(); + init_tx_intr_ep(); + init_tx_isoc_ep(); + + device_initialize(&fake_device); + kobject_set_name(&fake_device.kobj, "etrax_usb"); + kobject_add(&fake_device.kobj); + hc->bus->controller = &fake_device; + usb_register_bus(hc->bus); + + *R_IRQ_MASK2_SET = + /* Note that these interrupts are not used. */ + IO_STATE(R_IRQ_MASK2_SET, dma8_sub0_descr, set) | + /* Sub channel 1 (ctrl) descr. interrupts are used. */ + IO_STATE(R_IRQ_MASK2_SET, dma8_sub1_descr, set) | + IO_STATE(R_IRQ_MASK2_SET, dma8_sub2_descr, set) | + /* Sub channel 3 (isoc) descr. interrupts are used. */ + IO_STATE(R_IRQ_MASK2_SET, dma8_sub3_descr, set); + + /* Note that the dma9_descr interrupt is not used. */ + *R_IRQ_MASK2_SET = + IO_STATE(R_IRQ_MASK2_SET, dma9_eop, set) | + IO_STATE(R_IRQ_MASK2_SET, dma9_descr, set); + + /* FIXME: Enable iso_eof only when isoc traffic is running. */ + *R_USB_IRQ_MASK_SET = + IO_STATE(R_USB_IRQ_MASK_SET, iso_eof, set) | + IO_STATE(R_USB_IRQ_MASK_SET, bulk_eot, set) | + IO_STATE(R_USB_IRQ_MASK_SET, epid_attn, set) | + IO_STATE(R_USB_IRQ_MASK_SET, port_status, set) | + IO_STATE(R_USB_IRQ_MASK_SET, ctl_status, set); + + + if (request_irq(ETRAX_USB_HC_IRQ, etrax_usb_hc_interrupt_top_half, 0, + "ETRAX 100LX built-in USB (HC)", hc)) { + err("Could not allocate IRQ %d for USB", ETRAX_USB_HC_IRQ); + etrax_usb_hc_cleanup(); + DBFEXIT; + return -1; + } + + if (request_irq(ETRAX_USB_RX_IRQ, etrax_usb_rx_interrupt, 0, + "ETRAX 100LX built-in USB (Rx)", hc)) { + err("Could not allocate IRQ %d for USB", ETRAX_USB_RX_IRQ); + etrax_usb_hc_cleanup(); + DBFEXIT; + return -1; + } + + if (request_irq(ETRAX_USB_TX_IRQ, etrax_usb_tx_interrupt, 0, + "ETRAX 100LX built-in USB (Tx)", hc)) { + err("Could not allocate IRQ %d for USB", ETRAX_USB_TX_IRQ); + etrax_usb_hc_cleanup(); + DBFEXIT; + return -1; + } + + /* R_USB_COMMAND: + USB commands in host mode. The fields in this register should all be + written to in one write. Do not read-modify-write one field at a time. A + write to this register will trigger events in the USB controller and an + incomplete command may lead to unpredictable results, and in worst case + even to a deadlock in the controller. + (Note however that the busy field is read-only, so no need to write to it.) */ + + /* Check the busy bit before writing to R_USB_COMMAND. */ + + while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy)); + + /* Reset the USB interface. */ + *R_USB_COMMAND = + IO_STATE(R_USB_COMMAND, port_sel, nop) | + IO_STATE(R_USB_COMMAND, port_cmd, reset) | + IO_STATE(R_USB_COMMAND, ctrl_cmd, reset); + + /* Designer's Reference, p. 8 - 10 says we should Initate R_USB_FM_PSTART to 0x2A30 (10800), + to guarantee that control traffic gets 10% of the bandwidth, and periodic transfer may + allocate the rest (90%). This doesn't work though. Read on for a lenghty explanation. + + While there is a difference between rev. 2 and rev. 3 of the ETRAX 100LX regarding the NAK + behaviour, it doesn't solve this problem. What happens is that a control transfer will not + be interrupted in its data stage when PSTART happens (the point at which periodic traffic + is started). Thus, if PSTART is set to 10800 and its IN or OUT token is NAKed until just before + PSTART happens, it will continue the IN/OUT transfer as long as it's ACKed. After it's done, + there may be too little time left for an isochronous transfer, causing an epid attention + interrupt due to perror. The work-around for this is to let the control transfers run at the + end of the frame instead of at the beginning, and will be interrupted just fine if it doesn't + fit into the frame. However, since there will *always* be a control transfer at the beginning + of the frame, regardless of what we set PSTART to, that transfer might be a 64-byte transfer + which consumes up to 15% of the frame, leaving only 85% for periodic traffic. The solution to + this would be to 'dummy allocate' 5% of the frame with the usb_claim_bandwidth function to make + sure that the periodic transfers that are inserted will always fit in the frame. + + The idea was suggested that a control transfer could be split up into several 8 byte transfers, + so that it would be interrupted by PSTART, but since this can't be done for an IN transfer this + hasn't been implemented. + + The value 11960 is chosen to be just after the SOF token, with a couple of bit times extra + for possible bit stuffing. */ + + *R_USB_FM_PSTART = IO_FIELD(R_USB_FM_PSTART, value, 11960); + +#ifdef CONFIG_ETRAX_USB_HOST_PORT1 + *R_USB_PORT1_DISABLE = IO_STATE(R_USB_PORT1_DISABLE, disable, no); +#endif + +#ifdef CONFIG_ETRAX_USB_HOST_PORT2 + *R_USB_PORT2_DISABLE = IO_STATE(R_USB_PORT2_DISABLE, disable, no); +#endif + + while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy)); + + /* Configure the USB interface as a host controller. */ + *R_USB_COMMAND = + IO_STATE(R_USB_COMMAND, port_sel, nop) | + IO_STATE(R_USB_COMMAND, port_cmd, reset) | + IO_STATE(R_USB_COMMAND, ctrl_cmd, host_config); + + /* Note: Do not reset any ports here. Await the port status interrupts, to have a controlled + sequence of resetting the ports. If we reset both ports now, and there are devices + on both ports, we will get a bus error because both devices will answer the set address + request. */ + + while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy)); + + /* Start processing of USB traffic. */ + *R_USB_COMMAND = + IO_STATE(R_USB_COMMAND, port_sel, nop) | + IO_STATE(R_USB_COMMAND, port_cmd, reset) | + IO_STATE(R_USB_COMMAND, ctrl_cmd, host_run); + + while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy)); + + usb_rh = usb_alloc_dev(NULL, hc->bus, 0); + hc->bus->root_hub = usb_rh; + usb_rh->state = USB_STATE_ADDRESS; + usb_rh->speed = USB_SPEED_FULL; + usb_rh->devnum = 1; + hc->bus->devnum_next = 2; + usb_rh->ep0.desc.wMaxPacketSize = __const_cpu_to_le16(64); + usb_get_device_descriptor(usb_rh, USB_DT_DEVICE_SIZE); + usb_new_device(usb_rh); + + DBFEXIT; + + return 0; +} + +static void etrax_usb_hc_cleanup(void) +{ + DBFENTER; + + free_irq(ETRAX_USB_HC_IRQ, NULL); + free_irq(ETRAX_USB_RX_IRQ, NULL); + free_irq(ETRAX_USB_TX_IRQ, NULL); + + usb_deregister_bus(etrax_usb_bus); + + /* FIXME: call kmem_cache_destroy here? */ + + DBFEXIT; +} + +module_init(etrax_usb_hc_init); +module_exit(etrax_usb_hc_cleanup); |