diff options
Diffstat (limited to 'drivers/net/e2100.c')
| -rw-r--r-- | drivers/net/e2100.c | 485 |
1 files changed, 485 insertions, 0 deletions
diff --git a/drivers/net/e2100.c b/drivers/net/e2100.c new file mode 100644 index 000000000000..51c9fa260830 --- /dev/null +++ b/drivers/net/e2100.c @@ -0,0 +1,485 @@ +/* e2100.c: A Cabletron E2100 series ethernet driver for linux. */ +/* + Written 1993-1994 by Donald Becker. + + Copyright 1994 by Donald Becker. + Copyright 1993 United States Government as represented by the + Director, National Security Agency. This software may be used and + distributed according to the terms of the GNU General Public License, + incorporated herein by reference. + + This is a driver for the Cabletron E2100 series ethercards. + + The Author may be reached as becker@scyld.com, or C/O + Scyld Computing Corporation + 410 Severn Ave., Suite 210 + Annapolis MD 21403 + + The E2100 series ethercard is a fairly generic shared memory 8390 + implementation. The only unusual aspect is the way the shared memory + registers are set: first you do an inb() in what is normally the + station address region, and the low three bits of next outb() *address* + is used as the write value for that register. Either someone wasn't + too used to dem bit en bites, or they were trying to obfuscate the + programming interface. + + There is an additional complication when setting the window on the packet + buffer. You must first do a read into the packet buffer region with the + low 8 address bits the address setting the page for the start of the packet + buffer window, and then do the above operation. See mem_on() for details. + + One bug on the chip is that even a hard reset won't disable the memory + window, usually resulting in a hung machine if mem_off() isn't called. + If this happens, you must power down the machine for about 30 seconds. +*/ + +static const char version[] = + "e2100.c:v1.01 7/21/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n"; + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/ioport.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/init.h> +#include <linux/delay.h> + +#include <asm/io.h> +#include <asm/system.h> + +#include "8390.h" + +#define DRV_NAME "e2100" + +static int e21_probe_list[] = {0x300, 0x280, 0x380, 0x220, 0}; + +/* Offsets from the base_addr. + Read from the ASIC register, and the low three bits of the next outb() + address is used to set the corresponding register. */ +#define E21_NIC_OFFSET 0 /* Offset to the 8390 NIC. */ +#define E21_ASIC 0x10 +#define E21_MEM_ENABLE 0x10 +#define E21_MEM_ON 0x05 /* Enable memory in 16 bit mode. */ +#define E21_MEM_ON_8 0x07 /* Enable memory in 8 bit mode. */ +#define E21_MEM_BASE 0x11 +#define E21_IRQ_LOW 0x12 /* The low three bits of the IRQ number. */ +#define E21_IRQ_HIGH 0x14 /* The high IRQ bit and media select ... */ +#define E21_MEDIA 0x14 /* (alias). */ +#define E21_ALT_IFPORT 0x02 /* Set to use the other (BNC,AUI) port. */ +#define E21_BIG_MEM 0x04 /* Use a bigger (64K) buffer (we don't) */ +#define E21_SAPROM 0x10 /* Offset to station address data. */ +#define E21_IO_EXTENT 0x20 + +static inline void mem_on(short port, volatile char __iomem *mem_base, + unsigned char start_page ) +{ + /* This is a little weird: set the shared memory window by doing a + read. The low address bits specify the starting page. */ + readb(mem_base+start_page); + inb(port + E21_MEM_ENABLE); + outb(E21_MEM_ON, port + E21_MEM_ENABLE + E21_MEM_ON); +} + +static inline void mem_off(short port) +{ + inb(port + E21_MEM_ENABLE); + outb(0x00, port + E21_MEM_ENABLE); +} + +/* In other drivers I put the TX pages first, but the E2100 window circuitry + is designed to have a 4K Tx region last. The windowing circuitry wraps the + window at 0x2fff->0x0000 so that the packets at e.g. 0x2f00 in the RX ring + appear contiguously in the window. */ +#define E21_RX_START_PG 0x00 /* First page of RX buffer */ +#define E21_RX_STOP_PG 0x30 /* Last page +1 of RX ring */ +#define E21_BIG_RX_STOP_PG 0xF0 /* Last page +1 of RX ring */ +#define E21_TX_START_PG E21_RX_STOP_PG /* First page of TX buffer */ + +static int e21_probe1(struct net_device *dev, int ioaddr); + +static int e21_open(struct net_device *dev); +static void e21_reset_8390(struct net_device *dev); +static void e21_block_input(struct net_device *dev, int count, + struct sk_buff *skb, int ring_offset); +static void e21_block_output(struct net_device *dev, int count, + const unsigned char *buf, int start_page); +static void e21_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, + int ring_page); + +static int e21_close(struct net_device *dev); + + +/* Probe for the E2100 series ethercards. These cards have an 8390 at the + base address and the station address at both offset 0x10 and 0x18. I read + the station address from offset 0x18 to avoid the dataport of NE2000 + ethercards, and look for Ctron's unique ID (first three octets of the + station address). + */ + +static int __init do_e2100_probe(struct net_device *dev) +{ + int *port; + int base_addr = dev->base_addr; + int irq = dev->irq; + + SET_MODULE_OWNER(dev); + + if (base_addr > 0x1ff) /* Check a single specified location. */ + return e21_probe1(dev, base_addr); + else if (base_addr != 0) /* Don't probe at all. */ + return -ENXIO; + + for (port = e21_probe_list; *port; port++) { + dev->irq = irq; + if (e21_probe1(dev, *port) == 0) + return 0; + } + + return -ENODEV; +} + +static void cleanup_card(struct net_device *dev) +{ + /* NB: e21_close() handles free_irq */ + iounmap(ei_status.mem); + release_region(dev->base_addr, E21_IO_EXTENT); +} + +#ifndef MODULE +struct net_device * __init e2100_probe(int unit) +{ + struct net_device *dev = alloc_ei_netdev(); + int err; + + if (!dev) + return ERR_PTR(-ENOMEM); + + sprintf(dev->name, "eth%d", unit); + netdev_boot_setup_check(dev); + + err = do_e2100_probe(dev); + if (err) + goto out; + err = register_netdev(dev); + if (err) + goto out1; + return dev; +out1: + cleanup_card(dev); +out: + free_netdev(dev); + return ERR_PTR(err); +} +#endif + +static int __init e21_probe1(struct net_device *dev, int ioaddr) +{ + int i, status, retval; + unsigned char *station_addr = dev->dev_addr; + static unsigned version_printed; + + if (!request_region(ioaddr, E21_IO_EXTENT, DRV_NAME)) + return -EBUSY; + + /* First check the station address for the Ctron prefix. */ + if (inb(ioaddr + E21_SAPROM + 0) != 0x00 + || inb(ioaddr + E21_SAPROM + 1) != 0x00 + || inb(ioaddr + E21_SAPROM + 2) != 0x1d) { + retval = -ENODEV; + goto out; + } + + /* Verify by making certain that there is a 8390 at there. */ + outb(E8390_NODMA + E8390_STOP, ioaddr); + udelay(1); /* we want to delay one I/O cycle - which is 2MHz */ + status = inb(ioaddr); + if (status != 0x21 && status != 0x23) { + retval = -ENODEV; + goto out; + } + + /* Read the station address PROM. */ + for (i = 0; i < 6; i++) + station_addr[i] = inb(ioaddr + E21_SAPROM + i); + + inb(ioaddr + E21_MEDIA); /* Point to media selection. */ + outb(0, ioaddr + E21_ASIC); /* and disable the secondary interface. */ + + if (ei_debug && version_printed++ == 0) + printk(version); + + for (i = 0; i < 6; i++) + printk(" %02X", station_addr[i]); + + if (dev->irq < 2) { + int irqlist[] = {15,11,10,12,5,9,3,4}, i; + for (i = 0; i < 8; i++) + if (request_irq (irqlist[i], NULL, 0, "bogus", NULL) != -EBUSY) { + dev->irq = irqlist[i]; + break; + } + if (i >= 8) { + printk(" unable to get IRQ %d.\n", dev->irq); + retval = -EAGAIN; + goto out; + } + } else if (dev->irq == 2) /* Fixup luser bogosity: IRQ2 is really IRQ9 */ + dev->irq = 9; + + /* The 8390 is at the base address. */ + dev->base_addr = ioaddr; + + ei_status.name = "E2100"; + ei_status.word16 = 1; + ei_status.tx_start_page = E21_TX_START_PG; + ei_status.rx_start_page = E21_RX_START_PG; + ei_status.stop_page = E21_RX_STOP_PG; + ei_status.saved_irq = dev->irq; + + /* Check the media port used. The port can be passed in on the + low mem_end bits. */ + if (dev->mem_end & 15) + dev->if_port = dev->mem_end & 7; + else { + dev->if_port = 0; + inb(ioaddr + E21_MEDIA); /* Turn automatic media detection on. */ + for(i = 0; i < 6; i++) + if (station_addr[i] != inb(ioaddr + E21_SAPROM + 8 + i)) { + dev->if_port = 1; + break; + } + } + + /* Never map in the E21 shared memory unless you are actively using it. + Also, the shared memory has effective only one setting -- spread all + over the 128K region! */ + if (dev->mem_start == 0) + dev->mem_start = 0xd0000; + + ei_status.mem = ioremap(dev->mem_start, 2*1024); + if (!ei_status.mem) { + printk("unable to remap memory\n"); + retval = -EAGAIN; + goto out; + } + +#ifdef notdef + /* These values are unused. The E2100 has a 2K window into the packet + buffer. The window can be set to start on any page boundary. */ + ei_status.rmem_start = dev->mem_start + TX_PAGES*256; + dev->mem_end = ei_status.rmem_end = dev->mem_start + 2*1024; +#endif + + printk(", IRQ %d, %s media, memory @ %#lx.\n", dev->irq, + dev->if_port ? "secondary" : "primary", dev->mem_start); + + ei_status.reset_8390 = &e21_reset_8390; + ei_status.block_input = &e21_block_input; + ei_status.block_output = &e21_block_output; + ei_status.get_8390_hdr = &e21_get_8390_hdr; + dev->open = &e21_open; + dev->stop = &e21_close; +#ifdef CONFIG_NET_POLL_CONTROLLER + dev->poll_controller = ei_poll; +#endif + NS8390_init(dev, 0); + + return 0; +out: + release_region(ioaddr, E21_IO_EXTENT); + return retval; +} + +static int +e21_open(struct net_device *dev) +{ + short ioaddr = dev->base_addr; + int retval; + + if ((retval = request_irq(dev->irq, ei_interrupt, 0, dev->name, dev))) + return retval; + + /* Set the interrupt line and memory base on the hardware. */ + inb(ioaddr + E21_IRQ_LOW); + outb(0, ioaddr + E21_ASIC + (dev->irq & 7)); + inb(ioaddr + E21_IRQ_HIGH); /* High IRQ bit, and if_port. */ + outb(0, ioaddr + E21_ASIC + (dev->irq > 7 ? 1:0) + + (dev->if_port ? E21_ALT_IFPORT : 0)); + inb(ioaddr + E21_MEM_BASE); + outb(0, ioaddr + E21_ASIC + ((dev->mem_start >> 17) & 7)); + + ei_open(dev); + return 0; +} + +static void +e21_reset_8390(struct net_device *dev) +{ + short ioaddr = dev->base_addr; + + outb(0x01, ioaddr); + if (ei_debug > 1) printk("resetting the E2180x3 t=%ld...", jiffies); + ei_status.txing = 0; + + /* Set up the ASIC registers, just in case something changed them. */ + + if (ei_debug > 1) printk("reset done\n"); + return; +} + +/* Grab the 8390 specific header. We put the 2k window so the header page + appears at the start of the shared memory. */ + +static void +e21_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page) +{ + + short ioaddr = dev->base_addr; + char __iomem *shared_mem = ei_status.mem; + + mem_on(ioaddr, shared_mem, ring_page); + +#ifdef notdef + /* Officially this is what we are doing, but the readl() is faster */ + memcpy_fromio(hdr, shared_mem, sizeof(struct e8390_pkt_hdr)); +#else + ((unsigned int*)hdr)[0] = readl(shared_mem); +#endif + + /* Turn off memory access: we would need to reprogram the window anyway. */ + mem_off(ioaddr); + +} + +/* Block input and output are easy on shared memory ethercards. + The E21xx makes block_input() especially easy by wrapping the top + ring buffer to the bottom automatically. */ +static void +e21_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset) +{ + short ioaddr = dev->base_addr; + char __iomem *shared_mem = ei_status.mem; + + mem_on(ioaddr, shared_mem, (ring_offset>>8)); + + /* Packet is always in one chunk -- we can copy + cksum. */ + eth_io_copy_and_sum(skb, ei_status.mem + (ring_offset & 0xff), count, 0); + + mem_off(ioaddr); +} + +static void +e21_block_output(struct net_device *dev, int count, const unsigned char *buf, + int start_page) +{ + short ioaddr = dev->base_addr; + volatile char __iomem *shared_mem = ei_status.mem; + + /* Set the shared memory window start by doing a read, with the low address + bits specifying the starting page. */ + readb(shared_mem + start_page); + mem_on(ioaddr, shared_mem, start_page); + + memcpy_toio(shared_mem, buf, count); + mem_off(ioaddr); +} + +static int +e21_close(struct net_device *dev) +{ + short ioaddr = dev->base_addr; + + if (ei_debug > 1) + printk("%s: Shutting down ethercard.\n", dev->name); + + free_irq(dev->irq, dev); + dev->irq = ei_status.saved_irq; + + /* Shut off the interrupt line and secondary interface. */ + inb(ioaddr + E21_IRQ_LOW); + outb(0, ioaddr + E21_ASIC); + inb(ioaddr + E21_IRQ_HIGH); /* High IRQ bit, and if_port. */ + outb(0, ioaddr + E21_ASIC); + + ei_close(dev); + + /* Double-check that the memory has been turned off, because really + really bad things happen if it isn't. */ + mem_off(ioaddr); + + return 0; +} + + +#ifdef MODULE +#define MAX_E21_CARDS 4 /* Max number of E21 cards per module */ +static struct net_device *dev_e21[MAX_E21_CARDS]; +static int io[MAX_E21_CARDS]; +static int irq[MAX_E21_CARDS]; +static int mem[MAX_E21_CARDS]; +static int xcvr[MAX_E21_CARDS]; /* choose int. or ext. xcvr */ + +module_param_array(io, int, NULL, 0); +module_param_array(irq, int, NULL, 0); +module_param_array(mem, int, NULL, 0); +module_param_array(xcvr, int, NULL, 0); +MODULE_PARM_DESC(io, "I/O base address(es)"); +MODULE_PARM_DESC(irq, "IRQ number(s)"); +MODULE_PARM_DESC(mem, " memory base address(es)"); +MODULE_PARM_DESC(xcvr, "transceiver(s) (0=internal, 1=external)"); +MODULE_DESCRIPTION("Cabletron E2100 ISA ethernet driver"); +MODULE_LICENSE("GPL"); + +/* This is set up so that only a single autoprobe takes place per call. +ISA device autoprobes on a running machine are not recommended. */ +int +init_module(void) +{ + struct net_device *dev; + int this_dev, found = 0; + + for (this_dev = 0; this_dev < MAX_E21_CARDS; this_dev++) { + if (io[this_dev] == 0) { + if (this_dev != 0) break; /* only autoprobe 1st one */ + printk(KERN_NOTICE "e2100.c: Presently autoprobing (not recommended) for a single card.\n"); + } + dev = alloc_ei_netdev(); + if (!dev) + break; + dev->irq = irq[this_dev]; + dev->base_addr = io[this_dev]; + dev->mem_start = mem[this_dev]; + dev->mem_end = xcvr[this_dev]; /* low 4bits = xcvr sel. */ + if (do_e2100_probe(dev) == 0) { + if (register_netdev(dev) == 0) { + dev_e21[found++] = dev; + continue; + } + cleanup_card(dev); + } + free_netdev(dev); + printk(KERN_WARNING "e2100.c: No E2100 card found (i/o = 0x%x).\n", io[this_dev]); + break; + } + if (found) + return 0; + return -ENXIO; +} + +void +cleanup_module(void) +{ + int this_dev; + + for (this_dev = 0; this_dev < MAX_E21_CARDS; this_dev++) { + struct net_device *dev = dev_e21[this_dev]; + if (dev) { + unregister_netdev(dev); + cleanup_card(dev); + free_netdev(dev); + } + } +} +#endif /* MODULE */ |