/* * Driver for the PLX NET2280 USB device controller. * Specs and errata are available from . * * PLX Technology Inc. (formerly NetChip Technology) supported the * development of this driver. * * * CODE STATUS HIGHLIGHTS * * This driver should work well with most "gadget" drivers, including * the File Storage, Serial, and Ethernet/RNDIS gadget drivers * as well as Gadget Zero and Gadgetfs. * * DMA is enabled by default. Drivers using transfer queues might use * DMA chaining to remove IRQ latencies between transfers. (Except when * short OUT transfers happen.) Drivers can use the req->no_interrupt * hint to completely eliminate some IRQs, if a later IRQ is guaranteed * and DMA chaining is enabled. * * Note that almost all the errata workarounds here are only needed for * rev1 chips. Rev1a silicon (0110) fixes almost all of them. */ /* * Copyright (C) 2003 David Brownell * Copyright (C) 2003-2005 PLX Technology, Inc. * * Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility * with 2282 chip * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #undef DEBUG /* messages on error and most fault paths */ #undef VERBOSE /* extra debug messages (success too) */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define DRIVER_DESC "PLX NET228x USB Peripheral Controller" #define DRIVER_VERSION "2005 Sept 27" #define DMA_ADDR_INVALID (~(dma_addr_t)0) #define EP_DONTUSE 13 /* nonzero */ #define USE_RDK_LEDS /* GPIO pins control three LEDs */ static const char driver_name [] = "net2280"; static const char driver_desc [] = DRIVER_DESC; static const char ep0name [] = "ep0"; static const char *const ep_name [] = { ep0name, "ep-a", "ep-b", "ep-c", "ep-d", "ep-e", "ep-f", }; /* use_dma -- general goodness, fewer interrupts, less cpu load (vs PIO) * use_dma_chaining -- dma descriptor queueing gives even more irq reduction * * The net2280 DMA engines are not tightly integrated with their FIFOs; * not all cases are (yet) handled well in this driver or the silicon. * Some gadget drivers work better with the dma support here than others. * These two parameters let you use PIO or more aggressive DMA. */ static int use_dma = 1; static int use_dma_chaining = 0; /* "modprobe net2280 use_dma=n" etc */ module_param (use_dma, bool, S_IRUGO); module_param (use_dma_chaining, bool, S_IRUGO); /* mode 0 == ep-{a,b,c,d} 1K fifo each * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable */ static ushort fifo_mode = 0; /* "modprobe net2280 fifo_mode=1" etc */ module_param (fifo_mode, ushort, 0644); /* enable_suspend -- When enabled, the driver will respond to * USB suspend requests by powering down the NET2280. Otherwise, * USB suspend requests will be ignored. This is acceptable for * self-powered devices */ static int enable_suspend = 0; /* "modprobe net2280 enable_suspend=1" etc */ module_param (enable_suspend, bool, S_IRUGO); #define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out") #if defined(CONFIG_USB_GADGET_DEBUG_FILES) || defined (DEBUG) static char *type_string (u8 bmAttributes) { switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) { case USB_ENDPOINT_XFER_BULK: return "bulk"; case USB_ENDPOINT_XFER_ISOC: return "iso"; case USB_ENDPOINT_XFER_INT: return "intr"; }; return "control"; } #endif #include "net2280.h" #define valid_bit cpu_to_le32 (1 << VALID_BIT) #define dma_done_ie cpu_to_le32 (1 << DMA_DONE_INTERRUPT_ENABLE) /*-------------------------------------------------------------------------*/ static int net2280_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc) { struct net2280 *dev; struct net2280_ep *ep; u32 max, tmp; unsigned long flags; ep = container_of (_ep, struct net2280_ep, ep); if (!_ep || !desc || ep->desc || _ep->name == ep0name || desc->bDescriptorType != USB_DT_ENDPOINT) return -EINVAL; dev = ep->dev; if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) return -ESHUTDOWN; /* erratum 0119 workaround ties up an endpoint number */ if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE) return -EDOM; /* sanity check ep-e/ep-f since their fifos are small */ max = usb_endpoint_maxp (desc) & 0x1fff; if (ep->num > 4 && max > 64) return -ERANGE; spin_lock_irqsave (&dev->lock, flags); _ep->maxpacket = max & 0x7ff; ep->desc = desc; /* ep_reset() has already been called */ ep->stopped = 0; ep->wedged = 0; ep->out_overflow = 0; /* set speed-dependent max packet; may kick in high bandwidth */ set_idx_reg (dev->regs, REG_EP_MAXPKT (dev, ep->num), max); /* FIFO lines can't go to different packets. PIO is ok, so * use it instead of troublesome (non-bulk) multi-packet DMA. */ if (ep->dma && (max % 4) != 0 && use_dma_chaining) { DEBUG (ep->dev, "%s, no dma for maxpacket %d\n", ep->ep.name, ep->ep.maxpacket); ep->dma = NULL; } /* set type, direction, address; reset fifo counters */ writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat); tmp = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK); if (tmp == USB_ENDPOINT_XFER_INT) { /* erratum 0105 workaround prevents hs NYET */ if (dev->chiprev == 0100 && dev->gadget.speed == USB_SPEED_HIGH && !(desc->bEndpointAddress & USB_DIR_IN)) writel ((1 << CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp); } else if (tmp == USB_ENDPOINT_XFER_BULK) { /* catch some particularly blatant driver bugs */ if ((dev->gadget.speed == USB_SPEED_HIGH && max != 512) || (dev->gadget.speed == USB_SPEED_FULL && max > 64)) { spin_unlock_irqrestore (&dev->lock, flags); return -ERANGE; } } ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC) ? 1 : 0; tmp <<= ENDPOINT_TYPE; tmp |= desc->bEndpointAddress; tmp |= (4 << ENDPOINT_BYTE_COUNT); /* default full fifo lines */ tmp |= 1 << ENDPOINT_ENABLE; wmb (); /* for OUT transfers, block the rx fifo until a read is posted */ ep->is_in = (tmp & USB_DIR_IN) != 0; if (!ep->is_in) writel ((1 << SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp); else if (dev->pdev->device != 0x2280) { /* Added for 2282, Don't use nak packets on an in endpoint, * this was ignored on 2280 */ writel ((1 << CLEAR_NAK_OUT_PACKETS) | (1 << CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp); } writel (tmp, &ep->regs->ep_cfg); /* enable irqs */ if (!ep->dma) { /* pio, per-packet */ tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0); writel (tmp, &dev->regs->pciirqenb0); tmp = (1 << DATA_PACKET_RECEIVED_INTERRUPT_ENABLE) | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE); if (dev->pdev->device == 0x2280) tmp |= readl (&ep->regs->ep_irqenb); writel (tmp, &ep->regs->ep_irqenb); } else { /* dma, per-request */ tmp = (1 << (8 + ep->num)); /* completion */ tmp |= readl (&dev->regs->pciirqenb1); writel (tmp, &dev->regs->pciirqenb1); /* for short OUT transfers, dma completions can't * advance the queue; do it pio-style, by hand. * NOTE erratum 0112 workaround #2 */ if ((desc->bEndpointAddress & USB_DIR_IN) == 0) { tmp = (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE); writel (tmp, &ep->regs->ep_irqenb); tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0); writel (tmp, &dev->regs->pciirqenb0); } } tmp = desc->bEndpointAddress; DEBUG (dev, "enabled %s (ep%d%s-%s) %s max %04x\n", _ep->name, tmp & 0x0f, DIR_STRING (tmp), type_string (desc->bmAttributes), ep->dma ? "dma" : "pio", max); /* pci writes may still be posted */ spin_unlock_irqrestore (&dev->lock, flags); return 0; } static int handshake (u32 __iomem *ptr, u32 mask, u32 done, int usec) { u32 result; do { result = readl (ptr); if (result == ~(u32)0) /* "device unplugged" */ return -ENODEV; result &= mask; if (result == done) return 0; udelay (1); usec--; } while (usec > 0); return -ETIMEDOUT; } static const struct usb_ep_ops net2280_ep_ops; static void ep_reset (struct net2280_regs __iomem *regs, struct net2280_ep *ep) { u32 tmp; ep->desc = NULL; INIT_LIST_HEAD (&ep->queue); ep->ep.maxpacket = ~0; ep->ep.ops = &net2280_ep_ops; /* disable the dma, irqs, endpoint... */ if (ep->dma) { writel (0, &ep->dma->dmactl); writel ( (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT) | (1 << DMA_TRANSACTION_DONE_INTERRUPT) | (1 << DMA_ABORT) , &ep->dma->dmastat); tmp = readl (®s->pciirqenb0); tmp &= ~(1 << ep->num); writel (tmp, ®s->pciirqenb0); } else { tmp = readl (®s->pciirqenb1); tmp &= ~(1 << (8 + ep->num)); /* completion */ writel (tmp, ®s->pciirqenb1); } writel (0, &ep->regs->ep_irqenb); /* init to our chosen defaults, notably so that we NAK OUT * packets until the driver queues a read (+note erratum 0112) */ if (!ep->is_in || ep->dev->pdev->device == 0x2280) { tmp = (1 << SET_NAK_OUT_PACKETS_MODE) | (1 << SET_NAK_OUT_PACKETS) | (1 << CLEAR_EP_HIDE_STATUS_PHASE) | (1 << CLEAR_INTERRUPT_MODE); } else { /* added for 2282 */ tmp = (1 << CLEAR_NAK_OUT_PACKETS_MODE) | (1 << CLEAR_NAK_OUT_PACKETS) | (1 << CLEAR_EP_HIDE_STATUS_PHASE) | (1 << CLEAR_INTERRUPT_MODE); } if (ep->num != 0) { tmp |= (1 << CLEAR_ENDPOINT_TOGGLE) | (1 << CLEAR_ENDPOINT_HALT); } writel (tmp, &ep->regs->ep_rsp); /* scrub most status bits, and flush any fifo state */ if (ep->dev->pdev->device == 0x2280) tmp = (1 << FIFO_OVERFLOW) | (1 << FIFO_UNDERFLOW); else tmp = 0; writel (tmp | (1 << TIMEOUT) | (1 << USB_STALL_SENT) | (1 << USB_IN_NAK_SENT) | (1 << USB_IN_ACK_RCVD) | (1 << USB_OUT_PING_NAK_SENT) | (1 << USB_OUT_ACK_SENT) | (1 << FIFO_FLUSH) | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT) | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT) | (1 << DATA_PACKET_RECEIVED_INTERRUPT) | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT) | (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | (1 << DATA_IN_TOKEN_INTERRUPT) , &ep->regs->ep_stat); /* fifo size is handled separately */ } static void nuke (struct net2280_ep *); static int net2280_disable (struct usb_ep *_ep) { struct net2280_ep *ep; unsigned long flags; ep = container_of (_ep, struct net2280_ep, ep); if (!_ep || !ep->desc || _ep->name == ep0name) return -EINVAL; spin_lock_irqsave (&ep->dev->lock, flags); nuke (ep); ep_reset (ep->dev->regs, ep); VDEBUG (ep->dev, "disabled %s %s\n", ep->dma ? "dma" : "pio", _ep->name); /* synch memory views with the device */ (void) readl (&ep->regs->ep_cfg); if (use_dma && !ep->dma && ep->num >= 1 && ep->num <= 4) ep->dma = &ep->dev->dma [ep->num - 1]; spin_unlock_irqrestore (&ep->dev->lock, flags); return 0; } /*-------------------------------------------------------------------------*/ static struct usb_request * net2280_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags) { struct net2280_ep *ep; struct net2280_request *req; if (!_ep) return NULL; ep = container_of (_ep, struct net2280_ep, ep); req = kzalloc(sizeof(*req), gfp_flags); if (!req) return NULL; req->req.dma = DMA_ADDR_INVALID; INIT_LIST_HEAD (&req->queue); /* this dma descriptor may be swapped with the previous dummy */ if (ep->dma) { struct net2280_dma *td; td = pci_pool_alloc (ep->dev->requests, gfp_flags, &req->td_dma); if (!td) { kfree (req); return NULL; } td->dmacount = 0; /* not VALID */ td->dmaaddr = cpu_to_le32 (DMA_ADDR_INVALID); td->dmadesc = td->dmaaddr; req->td = td; } return &req->req; } static void net2280_free_request (struct usb_ep *_ep, struct usb_request *_req) { struct net2280_ep *ep; struct net2280_request *req; ep = container_of (_ep, struct net2280_ep, ep); if (!_ep || !_req) return; req = container_of (_req, struct net2280_request, req); WARN_ON (!list_empty (&req->queue)); if (req->td) pci_pool_free (ep->dev->requests, req->td, req->td_dma); kfree (req); } /*-------------------------------------------------------------------------*/ /* load a packet into the fifo we use for usb IN transfers. * works for all endpoints. * * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo * at a time, but this code is simpler because it knows it only writes * one packet. ep-a..ep-d should use dma instead. */ static void write_fifo (struct net2280_ep *ep, struct usb_request *req) { struct net2280_ep_regs __iomem *regs = ep->regs; u8 *buf; u32 tmp; unsigned count, total; /* INVARIANT: fifo is currently empty. (testable) */ if (req) { buf = req->buf + req->actual; prefetch (buf); total = req->length - req->actual; } else { total = 0; buf = NULL; } /* write just one packet at a time */ count = ep->ep.maxpacket; if (count > total) /* min() cannot be used on a bitfield */ count = total; VDEBUG (ep->dev, "write %s fifo (IN) %d bytes%s req %p\n", ep->ep.name, count, (count != ep->ep.maxpacket) ? " (short)" : "", req); while (count >= 4) { /* NOTE be careful if you try to align these. fifo lines * should normally be full (4 bytes) and successive partial * lines are ok only in certain cases. */ tmp = get_unaligned ((u32 *)buf); cpu_to_le32s (&tmp); writel (tmp, ®s->ep_data); buf += 4; count -= 4; } /* last fifo entry is "short" unless we wrote a full packet. * also explicitly validate last word in (periodic) transfers * when maxpacket is not a multiple of 4 bytes. */ if (count || total < ep->ep.maxpacket) { tmp = count ? get_unaligned ((u32 *)buf) : count; cpu_to_le32s (&tmp); set_fifo_bytecount (ep, count & 0x03); writel (tmp, ®s->ep_data); } /* pci writes may still be posted */ } /* work around erratum 0106: PCI and USB race over the OUT fifo. * caller guarantees chiprev 0100, out endpoint is NAKing, and * there's no real data in the fifo. * * NOTE: also used in cases where that erratum doesn't apply: * where the host wrote "too much" data to us. */ static void out_flush (struct net2280_ep *ep) { u32 __iomem *statp; u32 tmp; ASSERT_OUT_NAKING (ep); statp = &ep->regs->ep_stat; writel ( (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | (1 << DATA_PACKET_RECEIVED_INTERRUPT) , statp); writel ((1 << FIFO_FLUSH), statp); mb (); tmp = readl (statp); if (tmp & (1 << DATA_OUT_PING_TOKEN_INTERRUPT) /* high speed did bulk NYET; fifo isn't filling */ && ep->dev->gadget.speed == USB_SPEED_FULL) { unsigned usec; usec = 50; /* 64 byte bulk/interrupt */ handshake (statp, (1 << USB_OUT_PING_NAK_SENT), (1 << USB_OUT_PING_NAK_SENT), usec); /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */ } } /* unload packet(s) from the fifo we use for usb OUT transfers. * returns true iff the request completed, because of short packet * or the request buffer having filled with full packets. * * for ep-a..ep-d this will read multiple packets out when they * have been accepted. */ static int read_fifo (struct net2280_ep *ep, struct net2280_request *req) { struct net2280_ep_regs __iomem *regs = ep->regs; u8 *buf = req->req.buf + req->req.actual; unsigned count, tmp, is_short; unsigned cleanup = 0, prevent = 0; /* erratum 0106 ... packets coming in during fifo reads might * be incompletely rejected. not all cases have workarounds. */ if (ep->dev->chiprev == 0x0100 && ep->dev->gadget.speed == USB_SPEED_FULL) { udelay (1); tmp = readl (&ep->regs->ep_stat); if ((tmp & (1 << NAK_OUT_PACKETS))) cleanup = 1; else if ((tmp & (1 << FIFO_FULL))) { start_out_naking (ep); prevent = 1; } /* else: hope we don't see the problem */ } /* never overflow the rx buffer. the fifo reads packets until * it sees a short one; we might not be ready for them all. */ prefetchw (buf); count = readl (®s->ep_avail); if (unlikely (count == 0)) { udelay (1); tmp = readl (&ep->regs->ep_stat); count = readl (®s->ep_avail); /* handled that data already? */ if (count == 0 && (tmp & (1 << NAK_OUT_PACKETS)) == 0) return 0; } tmp = req->req.length - req->req.actual; if (count > tmp) { /* as with DMA, data overflow gets flushed */ if ((tmp % ep->ep.maxpacket) != 0) { ERROR (ep->dev, "%s out fifo %d bytes, expected %d\n", ep->ep.name, count, tmp); req->req.status = -EOVERFLOW; cleanup = 1; /* NAK_OUT_PACKETS will be set, so flushing is safe; * the next read will start with the next packet */ } /* else it's a ZLP, no worries */ count = tmp; } req->req.actual += count; is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0); VDEBUG (ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n", ep->ep.name, count, is_short ? " (short)" : "", cleanup ? " flush" : "", prevent ? " nak" : "", req, req->req.actual, req->req.length); while (count >= 4) { tmp = readl (®s->ep_data); cpu_to_le32s (&tmp); put_unaligned (tmp, (u32 *)buf); buf += 4; count -= 4; } if (count) { tmp = readl (®s->ep_data); /* LE conversion is implicit here: */ do { *buf++ = (u8) tmp; tmp >>= 8; } while (--count); } if (cleanup) out_flush (ep); if (prevent) { writel ((1 << CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp); (void) readl (&ep->regs->ep_rsp); } return is_short || ((req->req.actual == req->req.length) && !req->req.zero); } /* fill out dma descriptor to match a given request */ static void fill_dma_desc (struct net2280_ep *ep, struct net2280_request *req, int valid) { struct net2280_dma *td = req->td; u32 dmacount = req->req.length; /* don't let DMA continue after a short OUT packet, * so overruns can't affect the next transfer. * in case of overruns on max-size packets, we can't * stop the fifo from filling but we can flush it. */ if (ep->is_in) dmacount |= (1 << DMA_DIRECTION); if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0) || ep->dev->pdev->device != 0x2280) dmacount |= (1 << END_OF_CHAIN); req->valid = valid; if (valid) dmacount |= (1 << VALID_BIT); if (likely(!req->req.no_interrupt || !use_dma_chaining)) dmacount |= (1 << DMA_DONE_INTERRUPT_ENABLE); /* td->dmadesc = previously set by caller */ td->dmaaddr = cpu_to_le32 (req->req.dma); /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */ wmb (); td->dmacount = cpu_to_le32(dmacount); } static const u32 dmactl_default = (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT) | (1 << DMA_CLEAR_COUNT_ENABLE) /* erratum 0116 workaround part 1 (use POLLING) */ | (POLL_100_USEC << DESCRIPTOR_POLLING_RATE) | (1 << DMA_VALID_BIT_POLLING_ENABLE) | (1 << DMA_VALID_BIT_ENABLE) | (1 << DMA_SCATTER_GATHER_ENABLE) /* erratum 0116 workaround part 2 (no AUTOSTART) */ | (1 << DMA_ENABLE); static inline void spin_stop_dma (struct net2280_dma_regs __iomem *dma) { handshake (&dma->dmactl, (1 << DMA_ENABLE), 0, 50); } static inline void stop_dma (struct net2280_dma_regs __iomem *dma) { writel (readl (&dma->dmactl) & ~(1 << DMA_ENABLE), &dma->dmactl); spin_stop_dma (dma); } static void start_queue (struct net2280_ep *ep, u32 dmactl, u32 td_dma) { struct net2280_dma_regs __iomem *dma = ep->dma; unsigned int tmp = (1 << VALID_BIT) | (ep->is_in << DMA_DIRECTION); if (ep->dev->pdev->device != 0x2280) tmp |= (1 << END_OF_CHAIN); writel (tmp, &dma->dmacount); writel (readl (&dma->dmastat), &dma->dmastat); writel (td_dma, &dma->dmadesc); writel (dmactl, &dma->dmactl); /* erratum 0116 workaround part 3: pci arbiter away from net2280 */ (void) readl (&ep->dev->pci->pcimstctl); writel ((1 << DMA_START), &dma->dmastat); if (!ep->is_in) stop_out_naking (ep); } static void start_dma (struct net2280_ep *ep, struct net2280_request *req) { u32 tmp; struct net2280_dma_regs __iomem *dma = ep->dma; /* FIXME can't use DMA for ZLPs */ /* on this path we "know" there's no dma active (yet) */ WARN_ON (readl (&dma->dmactl) & (1 << DMA_ENABLE)); writel (0, &ep->dma->dmactl); /* previous OUT packet might have been short */ if (!ep->is_in && ((tmp = readl (&ep->regs->ep_stat)) & (1 << NAK_OUT_PACKETS)) != 0) { writel ((1 << SHORT_PACKET_TRANSFERRED_INTERRUPT), &ep->regs->ep_stat); tmp = readl (&ep->regs->ep_avail); if (tmp) { writel (readl (&dma->dmastat), &dma->dmastat); /* transfer all/some fifo data */ writel (req->req.dma, &dma->dmaaddr); tmp = min (tmp, req->req.length); /* dma irq, faking scatterlist status */ req->td->dmacount = cpu_to_le32 (req->req.length - tmp); writel ((1 << DMA_DONE_INTERRUPT_ENABLE) | tmp, &dma->dmacount); req->td->dmadesc = 0; req->valid = 1; writel ((1 << DMA_ENABLE), &dma->dmactl); writel ((1 << DMA_START), &dma->dmastat); return; } } tmp = dmactl_default; /* force packet boundaries between dma requests, but prevent the * controller from automagically writing a last "short" packet * (zero length) unless the driver explicitly said to do that. */ if (ep->is_in) { if (likely ((req->req.length % ep->ep.maxpacket) != 0 || req->req.zero)) { tmp |= (1 << DMA_FIFO_VALIDATE); ep->in_fifo_validate = 1; } else ep->in_fifo_validate = 0; } /* init req->td, pointing to the current dummy */ req->td->dmadesc = cpu_to_le32 (ep->td_dma); fill_dma_desc (ep, req, 1); if (!use_dma_chaining) req->td->dmacount |= cpu_to_le32 (1 << END_OF_CHAIN); start_queue (ep, tmp, req->td_dma); } static inline void queue_dma (struct net2280_ep *ep, struct net2280_request *req, int valid) { struct net2280_dma *end; dma_addr_t tmp; /* swap new dummy for old, link; fill and maybe activate */ end = ep->dummy; ep->dummy = req->td; req->td = end; tmp = ep->td_dma; ep->td_dma = req->td_dma; req->td_dma = tmp; end->dmadesc = cpu_to_le32 (ep->td_dma); fill_dma_desc (ep, req, valid); } static void done (struct net2280_ep *ep, struct net2280_request *req, int status) { struct net2280 *dev; unsigned stopped = ep->stopped; list_del_init (&req->queue); if (req->req.status == -EINPROGRESS) req->req.status = status; else status = req->req.status; dev = ep->dev; if (req->mapped) { pci_unmap_single (dev->pdev, req->req.dma, req->req.length, ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE); req->req.dma = DMA_ADDR_INVALID; req->mapped = 0; } if (status && status != -ESHUTDOWN) VDEBUG (dev, "complete %s req %p stat %d len %u/%u\n", ep->ep.name, &req->req, status, req->req.actual, req->req.length); /* don't modify queue heads during completion callback */ ep->stopped = 1; spin_unlock (&dev->lock); req->req.complete (&ep->ep, &req->req); spin_lock (&dev->lock); ep->stopped = stopped; } /*-------------------------------------------------------------------------*/ static int net2280_queue (struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags) { struct net2280_request *req; struct net2280_ep *ep; struct net2280 *dev; unsigned long flags; /* we always require a cpu-view buffer, so that we can * always use pio (as fallback or whatever). */ req = container_of (_req, struct net2280_request, req); if (!_req || !_req->complete || !_req->buf || !list_empty (&req->queue)) return -EINVAL; if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) return -EDOM; ep = container_of (_ep, struct net2280_ep, ep); if (!_ep || (!ep->desc && ep->num != 0)) return -EINVAL; dev = ep->dev; if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) return -ESHUTDOWN; /* FIXME implement PIO fallback for ZLPs with DMA */ if (ep->dma && _req->length == 0) return -EOPNOTSUPP; /* set up dma mapping in case the caller didn't */ if (ep->dma && _req->dma == DMA_ADDR_INVALID) { _req->dma = pci_map_single (dev->pdev, _req->buf, _req->length, ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE); req->mapped = 1; } #if 0 VDEBUG (dev, "%s queue req %p, len %d buf %p\n", _ep->name, _req, _req->length, _req->buf); #endif spin_lock_irqsave (&dev->lock, flags); _req->status = -EINPROGRESS; _req->actual = 0; /* kickstart this i/o queue? */ if (list_empty (&ep->queue) && !ep->stopped) { /* use DMA if the endpoint supports it, else pio */ if (ep->dma) start_dma (ep, req); else { /* maybe there's no control data, just status ack */ if (ep->num == 0 && _req->length == 0) { allow_status (ep); done (ep, req, 0); VDEBUG (dev, "%s status ack\n", ep->ep.name); goto done; } /* PIO ... stuff the fifo, or unblock it. */ if (ep->is_in) write_fifo (ep, _req); else if (list_empty (&ep->queue)) { u32 s; /* OUT FIFO might have packet(s) buffered */ s = readl (&ep->regs->ep_stat); if ((s & (1 << FIFO_EMPTY)) == 0) { /* note: _req->short_not_ok is * ignored here since PIO _always_ * stops queue advance here, and * _req->status doesn't change for * short reads (only _req->actual) */ if (read_fifo (ep, req)) { done (ep, req, 0); if (ep->num == 0) allow_status (ep); /* don't queue it */ req = NULL; } else s = readl (&ep->regs->ep_stat); } /* don't NAK, let the fifo fill */ if (req && (s & (1 << NAK_OUT_PACKETS))) writel ((1 << CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp); } } } else if (ep->dma) { int valid = 1; if (ep->is_in) { int expect; /* preventing magic zlps is per-engine state, not * per-transfer; irq logic must recover hiccups. */ expect = likely (req->req.zero || (req->req.length % ep->ep.maxpacket) != 0); if (expect != ep->in_fifo_validate) valid = 0; } queue_dma (ep, req, valid); } /* else the irq handler advances the queue. */ ep->responded = 1; if (req) list_add_tail (&req->queue, &ep->queue); done: spin_unlock_irqrestore (&dev->lock, flags); /* pci writes may still be posted */ return 0; } static inline void dma_done ( struct net2280_ep *ep, struct net2280_request *req, u32 dmacount, int status ) { req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount); done (ep, req, status); } static void restart_dma (struct net2280_ep *ep); static void scan_dma_completions (struct net2280_ep *ep) { /* only look at descriptors that were "naturally" retired, * so fifo and list head state won't matter */ while (!list_empty (&ep->queue)) { struct net2280_request *req; u32 tmp; req = list_entry (ep->queue.next, struct net2280_request, queue); if (!req->valid) break; rmb (); tmp = le32_to_cpup (&req->td->dmacount); if ((tmp & (1 << VALID_BIT)) != 0) break; /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short" * cases where DMA must be aborted; this code handles * all non-abort DMA completions. */ if (unlikely (req->td->dmadesc == 0)) { /* paranoia */ tmp = readl (&ep->dma->dmacount); if (tmp & DMA_BYTE_COUNT_MASK) break; /* single transfer mode */ dma_done (ep, req, tmp, 0); break; } else if (!ep->is_in && (req->req.length % ep->ep.maxpacket) != 0) { tmp = readl (&ep->regs->ep_stat); /* AVOID TROUBLE HERE by not issuing short reads from * your gadget driver. That helps avoids errata 0121, * 0122, and 0124; not all cases trigger the warning. */ if ((tmp & (1 << NAK_OUT_PACKETS)) == 0) { WARNING (ep->dev, "%s lost packet sync!\n", ep->ep.name); req->req.status = -EOVERFLOW; } else if ((tmp = readl (&ep->regs->ep_avail)) != 0) { /* fifo gets flushed later */ ep->out_overflow = 1; DEBUG (ep->dev, "%s dma, discard %d len %d\n", ep->ep.name, tmp, req->req.length); req->req.status = -EOVERFLOW; } } dma_done (ep, req, tmp, 0); } } static void restart_dma (struct net2280_ep *ep) { struct net2280_request *req; u32 dmactl = dmactl_default; if (ep->stopped) return; req = list_entry (ep->queue.next, struct net2280_request, queue); if (!use_dma_chaining) { start_dma (ep, req); return; } /* the 2280 will be processing the queue unless queue hiccups after * the previous transfer: * IN: wanted automagic zlp, head doesn't (or vice versa) * DMA_FIFO_VALIDATE doesn't init from dma descriptors. * OUT: was "usb-short", we must restart. */ if (ep->is_in && !req->valid) { struct net2280_request *entry, *prev = NULL; int reqmode, done = 0; DEBUG (ep->dev, "%s dma hiccup td %p\n", ep->ep.name, req->td); ep->in_fifo_validate = likely (req->req.zero || (req->req.length % ep->ep.maxpacket) != 0); if (ep->in_fifo_validate) dmactl |= (1 << DMA_FIFO_VALIDATE); list_for_each_entry (entry, &ep->queue, queue) { __le32 dmacount; if (entry == req) continue; dmacount = entry->td->dmacount; if (!done) { reqmode = likely (entry->req.zero || (entry->req.length % ep->ep.maxpacket) != 0); if (reqmode == ep->in_fifo_validate) { entry->valid = 1; dmacount |= valid_bit; entry->td->dmacount = dmacount; prev = entry; continue; } else { /* force a hiccup */ prev->td->dmacount |= dma_done_ie; done = 1; } } /* walk the rest of the queue so unlinks behave */ entry->valid = 0; dmacount &= ~valid_bit; entry->td->dmacount = dmacount; prev = entry; } } writel (0, &ep->dma->dmactl); start_queue (ep, dmactl, req->td_dma); } static void abort_dma (struct net2280_ep *ep) { /* abort the current transfer */ if (likely (!list_empty (&ep->queue))) { /* FIXME work around errata 0121, 0122, 0124 */ writel ((1 << DMA_ABORT), &ep->dma->dmastat); spin_stop_dma (ep->dma); } else stop_dma (ep->dma); scan_dma_completions (ep); } /* dequeue ALL requests */ static void nuke (struct net2280_ep *ep) { struct net2280_request *req; /* called with spinlock held */ ep->stopped = 1; if (ep->dma) abort_dma (ep); while (!list_empty (&ep->queue)) { req = list_entry (ep->queue.next, struct net2280_request, queue); done (ep, req, -ESHUTDOWN); } } /* dequeue JUST ONE request */ static int net2280_dequeue (struct usb_ep *_ep, struct usb_request *_req) { struct net2280_ep *ep; struct net2280_request *req; unsigned long flags; u32 dmactl; int stopped; ep = container_of (_ep, struct net2280_ep, ep); if (!_ep || (!ep->desc && ep->num != 0) || !_req) return -EINVAL; spin_lock_irqsave (&ep->dev->lock, flags); stopped = ep->stopped; /* quiesce dma while we patch the queue */ dmactl = 0; ep->stopped = 1; if (ep->dma) { dmactl = readl (&ep->dma->dmactl); /* WARNING erratum 0127 may kick in ... */ stop_dma (ep->dma); scan_dma_completions (ep); } /* make sure it's still queued on this endpoint */ list_for_each_entry (req, &ep->queue, queue) { if (&req->req == _req) break; } if (&req->req != _req) { spin_unlock_irqrestore (&ep->dev->lock, flags); return -EINVAL; } /* queue head may be partially complete. */ if (ep->queue.next == &req->queue) { if (ep->dma) { DEBUG (ep->dev, "unlink (%s) dma\n", _ep->name); _req->status = -ECONNRESET; abort_dma (ep); if (likely (ep->queue.next == &req->queue)) { // NOTE: misreports single-transfer mode req->td->dmacount = 0; /* invalidate */ dma_done (ep, req, readl (&ep->dma->dmacount), -ECONNRESET); } } else { DEBUG (ep->dev, "unlink (%s) pio\n", _ep->name); done (ep, req, -ECONNRESET); } req = NULL; /* patch up hardware chaining data */ } else if (ep->dma && use_dma_chaining) { if (req->queue.prev == ep->queue.next) { writel (le32_to_cpu (req->td->dmadesc), &ep->dma->dmadesc); if (req->td->dmacount & dma_done_ie) writel (readl (&ep->dma->dmacount) | le32_to_cpu(dma_done_ie), &ep->dma->dmacount); } else { struct net2280_request *prev; prev = list_entry (req->queue.prev, struct net2280_request, queue); prev->td->dmadesc = req->td->dmadesc; if (req->td->dmacount & dma_done_ie) prev->td->dmacount |= dma_done_ie; } } if (req) done (ep, req, -ECONNRESET); ep->stopped = stopped; if (ep->dma) { /* turn off dma on inactive queues */ if (list_empty (&ep->queue)) stop_dma (ep->dma); else if (!ep->stopped) { /* resume current request, or start new one */ if (req) writel (dmactl, &ep->dma->dmactl); else start_dma (ep, list_entry (ep->queue.next, struct net2280_request, queue)); } } spin_unlock_irqrestore (&ep->dev->lock, flags); return 0; } /*-------------------------------------------------------------------------*/ static int net2280_fifo_status (struct usb_ep *_ep); static int net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged) { struct net2280_ep *ep; unsigned long flags; int retval = 0; ep = container_of (_ep, struct net2280_ep, ep); if (!_ep || (!ep->desc && ep->num != 0)) return -EINVAL; if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) return -ESHUTDOWN; if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03) == USB_ENDPOINT_XFER_ISOC) return -EINVAL; spin_lock_irqsave (&ep->dev->lock, flags); if (!list_empty (&ep->queue)) retval = -EAGAIN; else if (ep->is_in && value && net2280_fifo_status (_ep) != 0) retval = -EAGAIN; else { VDEBUG (ep->dev, "%s %s %s\n", _ep->name, value ? "set" : "clear", wedged ? "wedge" : "halt"); /* set/clear, then synch memory views with the device */ if (value) { if (ep->num == 0) ep->dev->protocol_stall = 1; else set_halt (ep); if (wedged) ep->wedged = 1; } else { clear_halt (ep); ep->wedged = 0; } (void) readl (&ep->regs->ep_rsp); } spin_unlock_irqrestore (&ep->dev->lock, flags); return retval; } static int net2280_set_halt(struct usb_ep *_ep, int value) { return net2280_set_halt_and_wedge(_ep, value, 0); } static int net2280_set_wedge(struct usb_ep *_ep) { if (!_ep || _ep->name == ep0name) return -EINVAL; return net2280_set_halt_and_wedge(_ep, 1, 1); } static int net2280_fifo_status (struct usb_ep *_ep) { struct net2280_ep *ep; u32 avail; ep = container_of (_ep, struct net2280_ep, ep); if (!_ep || (!ep->desc && ep->num != 0)) return -ENODEV; if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) return -ESHUTDOWN; avail = readl (&ep->regs->ep_avail) & ((1 << 12) - 1); if (avail > ep->fifo_size) return -EOVERFLOW; if (ep->is_in) avail = ep->fifo_size - avail; return avail; } static void net2280_fifo_flush (struct usb_ep *_ep) { struct net2280_ep *ep; ep = container_of (_ep, struct net2280_ep, ep); if (!_ep || (!ep->desc && ep->num != 0)) return; if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) return; writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat); (void) readl (&ep->regs->ep_rsp); } static const struct usb_ep_ops net2280_ep_ops = { .enable = net2280_enable, .disable = net2280_disable, .alloc_request = net2280_alloc_request, .free_request = net2280_free_request, .queue = net2280_queue, .dequeue = net2280_dequeue, .set_halt = net2280_set_halt, .set_wedge = net2280_set_wedge, .fifo_status = net2280_fifo_status, .fifo_flush = net2280_fifo_flush, }; /*-------------------------------------------------------------------------*/ static int net2280_get_frame (struct usb_gadget *_gadget) { struct net2280 *dev; unsigned long flags; u16 retval; if (!_gadget) return -ENODEV; dev = container_of (_gadget, struct net2280, gadget); spin_lock_irqsave (&dev->lock, flags); retval = get_idx_reg (dev->regs, REG_FRAME) & 0x03ff; spin_unlock_irqrestore (&dev->lock, flags); return retval; } static int net2280_wakeup (struct usb_gadget *_gadget) { struct net2280 *dev; u32 tmp; unsigned long flags; if (!_gadget) return 0; dev = container_of (_gadget, struct net2280, gadget); spin_lock_irqsave (&dev->lock, flags); tmp = readl (&dev->usb->usbctl); if (tmp & (1 << DEVICE_REMOTE_WAKEUP_ENABLE)) writel (1 << GENERATE_RESUME, &dev->usb->usbstat); spin_unlock_irqrestore (&dev->lock, flags); /* pci writes may still be posted */ return 0; } static int net2280_set_selfpowered (struct usb_gadget *_gadget, int value) { struct net2280 *dev; u32 tmp; unsigned long flags; if (!_gadget) return 0; dev = container_of (_gadget, struct net2280, gadget); spin_lock_irqsave (&dev->lock, flags); tmp = readl (&dev->usb->usbctl); if (value) tmp |= (1 << SELF_POWERED_STATUS); else tmp &= ~(1 << SELF_POWERED_STATUS); writel (tmp, &dev->usb->usbctl); spin_unlock_irqrestore (&dev->lock, flags); return 0; } static int net2280_pullup(struct usb_gadget *_gadget, int is_on) { struct net2280 *dev; u32 tmp; unsigned long flags; if (!_gadget) return -ENODEV; dev = container_of (_gadget, struct net2280, gadget); spin_lock_irqsave (&dev->lock, flags); tmp = readl (&dev->usb->usbctl); dev->softconnect = (is_on != 0); if (is_on) tmp |= (1 << USB_DETECT_ENABLE); else tmp &= ~(1 << USB_DETECT_ENABLE); writel (tmp, &dev->usb->usbctl); spin_unlock_irqrestore (&dev->lock, flags); return 0; } static int net2280_start(struct usb_gadget *_gadget, struct usb_gadget_driver *driver); static int net2280_stop(struct usb_gadget *_gadget, struct usb_gadget_driver *driver); static const struct usb_gadget_ops net2280_ops = { .get_frame = net2280_get_frame, .wakeup = net2280_wakeup, .set_selfpowered = net2280_set_selfpowered, .pullup = net2280_pullup, .udc_start = net2280_start, .udc_stop = net2280_stop, }; /*-------------------------------------------------------------------------*/ #ifdef CONFIG_USB_GADGET_DEBUG_FILES /* FIXME move these into procfs, and use seq_file. * Sysfs _still_ doesn't behave for arbitrarily sized files, * and also doesn't help products using this with 2.4 kernels. */ /* "function" sysfs attribute */ static ssize_t show_function (struct device *_dev, struct device_attribute *attr, char *buf) { struct net2280 *dev = dev_get_drvdata (_dev); if (!dev->driver || !dev->driver->function || strlen (dev->driver->function) > PAGE_SIZE) return 0; return scnprintf (buf, PAGE_SIZE, "%s\n", dev->driver->function); } static DEVICE_ATTR (function, S_IRUGO, show_function, NULL); static ssize_t net2280_show_registers(struct device *_dev, struct device_attribute *attr, char *buf) { struct net2280 *dev; char *next; unsigned size, t; unsigned long flags; int i; u32 t1, t2; const char *s; dev = dev_get_drvdata (_dev); next = buf; size = PAGE_SIZE; spin_lock_irqsave (&dev->lock, flags); if (dev->driver) s = dev->driver->driver.name; else s = "(none)"; /* Main Control Registers */ t = scnprintf (next, size, "%s version " DRIVER_VERSION ", chiprev %04x, dma %s\n\n" "devinit %03x fifoctl %08x gadget '%s'\n" "pci irqenb0 %02x irqenb1 %08x " "irqstat0 %04x irqstat1 %08x\n", driver_name, dev->chiprev, use_dma ? (use_dma_chaining ? "chaining" : "enabled") : "disabled", readl (&dev->regs->devinit), readl (&dev->regs->fifoctl), s, readl (&dev->regs->pciirqenb0), readl (&dev->regs->pciirqenb1), readl (&dev->regs->irqstat0), readl (&dev->regs->irqstat1)); size -= t; next += t; /* USB Control Registers */ t1 = readl (&dev->usb->usbctl); t2 = readl (&dev->usb->usbstat); if (t1 & (1 << VBUS_PIN)) { if (t2 & (1 << HIGH_SPEED)) s = "high speed"; else if (dev->gadget.speed == USB_SPEED_UNKNOWN) s = "powered"; else s = "full speed"; /* full speed bit (6) not working?? */ } else s = "not attached"; t = scnprintf (next, size, "stdrsp %08x usbctl %08x usbstat %08x " "addr 0x%02x (%s)\n", readl (&dev->usb->stdrsp), t1, t2, readl (&dev->usb->ouraddr), s); size -= t; next += t; /* PCI Master Control Registers */ /* DMA Control Registers */ /* Configurable EP Control Registers */ for (i = 0; i < 7; i++) { struct net2280_ep *ep; ep = &dev->ep [i]; if (i && !ep->desc) continue; t1 = readl (&ep->regs->ep_cfg); t2 = readl (&ep->regs->ep_rsp) & 0xff; t = scnprintf (next, size, "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s" "irqenb %02x\n", ep->ep.name, t1, t2, (t2 & (1 << CLEAR_NAK_OUT_PACKETS)) ? "NAK " : "", (t2 & (1 << CLEAR_EP_HIDE_STATUS_PHASE)) ? "hide " : "", (t2 & (1 << CLEAR_EP_FORCE_CRC_ERROR)) ? "CRC " : "", (t2 & (1 << CLEAR_INTERRUPT_MODE)) ? "interrupt " : "", (t2 & (1<regs->ep_irqenb)); size -= t; next += t; t = scnprintf (next, size, "\tstat %08x avail %04x " "(ep%d%s-%s)%s\n", readl (&ep->regs->ep_stat), readl (&ep->regs->ep_avail), t1 & 0x0f, DIR_STRING (t1), type_string (t1 >> 8), ep->stopped ? "*" : ""); size -= t; next += t; if (!ep->dma) continue; t = scnprintf (next, size, " dma\tctl %08x stat %08x count %08x\n" "\taddr %08x desc %08x\n", readl (&ep->dma->dmactl), readl (&ep->dma->dmastat), readl (&ep->dma->dmacount), readl (&ep->dma->dmaaddr), readl (&ep->dma->dmadesc)); size -= t; next += t; } /* Indexed Registers */ // none yet /* Statistics */ t = scnprintf (next, size, "\nirqs: "); size -= t; next += t; for (i = 0; i < 7; i++) { struct net2280_ep *ep; ep = &dev->ep [i]; if (i && !ep->irqs) continue; t = scnprintf (next, size, " %s/%lu", ep->ep.name, ep->irqs); size -= t; next += t; } t = scnprintf (next, size, "\n"); size -= t; next += t; spin_unlock_irqrestore (&dev->lock, flags); return PAGE_SIZE - size; } static DEVICE_ATTR(registers, S_IRUGO, net2280_show_registers, NULL); static ssize_t show_queues (struct device *_dev, struct device_attribute *attr, char *buf) { struct net2280 *dev; char *next; unsigned size; unsigned long flags; int i; dev = dev_get_drvdata (_dev); next = buf; size = PAGE_SIZE; spin_lock_irqsave (&dev->lock, flags); for (i = 0; i < 7; i++) { struct net2280_ep *ep = &dev->ep [i]; struct net2280_request *req; int t; if (i != 0) { const struct usb_endpoint_descriptor *d; d = ep->desc; if (!d) continue; t = d->bEndpointAddress; t = scnprintf (next, size, "\n%s (ep%d%s-%s) max %04x %s fifo %d\n", ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK, (t & USB_DIR_IN) ? "in" : "out", ({ char *val; switch (d->bmAttributes & 0x03) { case USB_ENDPOINT_XFER_BULK: val = "bulk"; break; case USB_ENDPOINT_XFER_INT: val = "intr"; break; default: val = "iso"; break; }; val; }), usb_endpoint_maxp (d) & 0x1fff, ep->dma ? "dma" : "pio", ep->fifo_size ); } else /* ep0 should only have one transfer queued */ t = scnprintf (next, size, "ep0 max 64 pio %s\n", ep->is_in ? "in" : "out"); if (t <= 0 || t > size) goto done; size -= t; next += t; if (list_empty (&ep->queue)) { t = scnprintf (next, size, "\t(nothing queued)\n"); if (t <= 0 || t > size) goto done; size -= t; next += t; continue; } list_for_each_entry (req, &ep->queue, queue) { if (ep->dma && req->td_dma == readl (&ep->dma->dmadesc)) t = scnprintf (next, size, "\treq %p len %d/%d " "buf %p (dmacount %08x)\n", &req->req, req->req.actual, req->req.length, req->req.buf, readl (&ep->dma->dmacount)); else t = scnprintf (next, size, "\treq %p len %d/%d buf %p\n", &req->req, req->req.actual, req->req.length, req->req.buf); if (t <= 0 || t > size) goto done; size -= t; next += t; if (ep->dma) { struct net2280_dma *td; td = req->td; t = scnprintf (next, size, "\t td %08x " " count %08x buf %08x desc %08x\n", (u32) req->td_dma, le32_to_cpu (td->dmacount), le32_to_cpu (td->dmaaddr), le32_to_cpu (td->dmadesc)); if (t <= 0 || t > size) goto done; size -= t; next += t; } } } done: spin_unlock_irqrestore (&dev->lock, flags); return PAGE_SIZE - size; } static DEVICE_ATTR (queues, S_IRUGO, show_queues, NULL); #else #define device_create_file(a,b) (0) #define device_remove_file(a,b) do { } while (0) #endif /*-------------------------------------------------------------------------*/ /* another driver-specific mode might be a request type doing dma * to/from another device fifo instead of to/from memory. */ static void set_fifo_mode (struct net2280 *dev, int mode) { /* keeping high bits preserves BAR2 */ writel ((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl); /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */ INIT_LIST_HEAD (&dev->gadget.ep_list); list_add_tail (&dev->ep [1].ep.ep_list, &dev->gadget.ep_list); list_add_tail (&dev->ep [2].ep.ep_list, &dev->gadget.ep_list); switch (mode) { case 0: list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list); list_add_tail (&dev->ep [4].ep.ep_list, &dev->gadget.ep_list); dev->ep [1].fifo_size = dev->ep [2].fifo_size = 1024; break; case 1: dev->ep [1].fifo_size = dev->ep [2].fifo_size = 2048; break; case 2: list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list); dev->ep [1].fifo_size = 2048; dev->ep [2].fifo_size = 1024; break; } /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */ list_add_tail (&dev->ep [5].ep.ep_list, &dev->gadget.ep_list); list_add_tail (&dev->ep [6].ep.ep_list, &dev->gadget.ep_list); } /* keeping it simple: * - one bus driver, initted first; * - one function driver, initted second * * most of the work to support multiple net2280 controllers would * be to associate this gadget driver (yes?) with all of them, or * perhaps to bind specific drivers to specific devices. */ static void usb_reset (struct net2280 *dev) { u32 tmp; dev->gadget.speed = USB_SPEED_UNKNOWN; (void) readl (&dev->usb->usbctl); net2280_led_init (dev); /* disable automatic responses, and irqs */ writel (0, &dev->usb->stdrsp); writel (0, &dev->regs->pciirqenb0); writel (0, &dev->regs->pciirqenb1); /* clear old dma and irq state */ for (tmp = 0; tmp < 4; tmp++) { struct net2280_ep *ep = &dev->ep [tmp + 1]; if (ep->dma) abort_dma (ep); } writel (~0, &dev->regs->irqstat0), writel (~(1 << SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1), /* reset, and enable pci */ tmp = readl (&dev->regs->devinit) | (1 << PCI_ENABLE) | (1 << FIFO_SOFT_RESET) | (1 << USB_SOFT_RESET) | (1 << M8051_RESET); writel (tmp, &dev->regs->devinit); /* standard fifo and endpoint allocations */ set_fifo_mode (dev, (fifo_mode <= 2) ? fifo_mode : 0); } static void usb_reinit (struct net2280 *dev) { u32 tmp; int init_dma; /* use_dma changes are ignored till next device re-init */ init_dma = use_dma; /* basic endpoint init */ for (tmp = 0; tmp < 7; tmp++) { struct net2280_ep *ep = &dev->ep [tmp]; ep->ep.name = ep_name [tmp]; ep->dev = dev; ep->num = tmp; if (tmp > 0 && tmp <= 4) { ep->fifo_size = 1024; if (init_dma) ep->dma = &dev->dma [tmp - 1]; } else ep->fifo_size = 64; ep->regs = &dev->epregs [tmp]; ep_reset (dev->regs, ep); } dev->ep [0].ep.maxpacket = 64; dev->ep [5].ep.maxpacket = 64; dev->ep [6].ep.maxpacket = 64; dev->gadget.ep0 = &dev->ep [0].ep; dev->ep [0].stopped = 0; INIT_LIST_HEAD (&dev->gadget.ep0->ep_list); /* we want to prevent lowlevel/insecure access from the USB host, * but erratum 0119 means this enable bit is ignored */ for (tmp = 0; tmp < 5; tmp++) writel (EP_DONTUSE, &dev->dep [tmp].dep_cfg); } static void ep0_start (struct net2280 *dev) { writel ( (1 << CLEAR_EP_HIDE_STATUS_PHASE) | (1 << CLEAR_NAK_OUT_PACKETS) | (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE) , &dev->epregs [0].ep_rsp); /* * hardware optionally handles a bunch of standard requests * that the API hides from drivers anyway. have it do so. * endpoint status/features are handled in software, to * help pass tests for some dubious behavior. */ writel ( (1 << SET_TEST_MODE) | (1 << SET_ADDRESS) | (1 << DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) | (1 << GET_DEVICE_STATUS) | (1 << GET_INTERFACE_STATUS) , &dev->usb->stdrsp); writel ( (1 << USB_ROOT_PORT_WAKEUP_ENABLE) | (1 << SELF_POWERED_USB_DEVICE) | (1 << REMOTE_WAKEUP_SUPPORT) | (dev->softconnect << USB_DETECT_ENABLE) | (1 << SELF_POWERED_STATUS) , &dev->usb->usbctl); /* enable irqs so we can see ep0 and general operation */ writel ( (1 << SETUP_PACKET_INTERRUPT_ENABLE) | (1 << ENDPOINT_0_INTERRUPT_ENABLE) , &dev->regs->pciirqenb0); writel ( (1 << PCI_INTERRUPT_ENABLE) | (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) | (1 << PCI_RETRY_ABORT_INTERRUPT_ENABLE) | (1 << VBUS_INTERRUPT_ENABLE) | (1 << ROOT_PORT_RESET_INTERRUPT_ENABLE) | (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) , &dev->regs->pciirqenb1); /* don't leave any writes posted */ (void) readl (&dev->usb->usbctl); } /* when a driver is successfully registered, it will receive * control requests including set_configuration(), which enables * non-control requests. then usb traffic follows until a * disconnect is reported. then a host may connect again, or * the driver might get unbound. */ static int net2280_start(struct usb_gadget *_gadget, struct usb_gadget_driver *driver) { struct net2280 *dev; int retval; unsigned i; /* insist on high speed support from the driver, since * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE) * "must not be used in normal operation" */ if (!driver || driver->speed != USB_SPEED_HIGH || !driver->setup) return -EINVAL; dev = container_of (_gadget, struct net2280, gadget); for (i = 0; i < 7; i++) dev->ep [i].irqs = 0; /* hook up the driver ... */ dev->softconnect = 1; driver->driver.bus = NULL; dev->driver = driver; dev->gadget.dev.driver = &driver->driver; retval = device_create_file (&dev->pdev->dev, &dev_attr_function); if (retval) goto err_unbind; retval = device_create_file (&dev->pdev->dev, &dev_attr_queues); if (retval) goto err_func; /* ... then enable host detection and ep0; and we're ready * for set_configuration as well as eventual disconnect. */ net2280_led_active (dev, 1); ep0_start (dev); DEBUG (dev, "%s ready, usbctl %08x stdrsp %08x\n", driver->driver.name, readl (&dev->usb->usbctl), readl (&dev->usb->stdrsp)); /* pci writes may still be posted */ return 0; err_func: device_remove_file (&dev->pdev->dev, &dev_attr_function); err_unbind: driver->unbind (&dev->gadget); dev->gadget.dev.driver = NULL; dev->driver = NULL; return retval; } static void stop_activity (struct net2280 *dev, struct usb_gadget_driver *driver) { int i; /* don't disconnect if it's not connected */ if (dev->gadget.speed == USB_SPEED_UNKNOWN) driver = NULL; /* stop hardware; prevent new request submissions; * and kill any outstanding requests. */ usb_reset (dev); for (i = 0; i < 7; i++) nuke (&dev->ep [i]); usb_reinit (dev); } static int net2280_stop(struct usb_gadget *_gadget, struct usb_gadget_driver *driver) { struct net2280 *dev; unsigned long flags; dev = container_of (_gadget, struct net2280, gadget); spin_lock_irqsave (&dev->lock, flags); stop_activity (dev, driver); spin_unlock_irqrestore (&dev->lock, flags); dev->gadget.dev.driver = NULL; dev->driver = NULL; net2280_led_active (dev, 0); device_remove_file (&dev->pdev->dev, &dev_attr_function); device_remove_file (&dev->pdev->dev, &dev_attr_queues); DEBUG (dev, "unregistered driver '%s'\n", driver->driver.name); return 0; } /*-------------------------------------------------------------------------*/ /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq. * also works for dma-capable endpoints, in pio mode or just * to manually advance the queue after short OUT transfers. */ static void handle_ep_small (struct net2280_ep *ep) { struct net2280_request *req; u32 t; /* 0 error, 1 mid-data, 2 done */ int mode = 1; if (!list_empty (&ep->queue)) req = list_entry (ep->queue.next, struct net2280_request, queue); else req = NULL; /* ack all, and handle what we care about */ t = readl (&ep->regs->ep_stat); ep->irqs++; #if 0 VDEBUG (ep->dev, "%s ack ep_stat %08x, req %p\n", ep->ep.name, t, req ? &req->req : 0); #endif if (!ep->is_in || ep->dev->pdev->device == 0x2280) writel (t & ~(1 << NAK_OUT_PACKETS), &ep->regs->ep_stat); else /* Added for 2282 */ writel (t, &ep->regs->ep_stat); /* for ep0, monitor token irqs to catch data stage length errors * and to synchronize on status. * * also, to defer reporting of protocol stalls ... here's where * data or status first appears, handling stalls here should never * cause trouble on the host side.. * * control requests could be slightly faster without token synch for * status, but status can jam up that way. */ if (unlikely (ep->num == 0)) { if (ep->is_in) { /* status; stop NAKing */ if (t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)) { if (ep->dev->protocol_stall) { ep->stopped = 1; set_halt (ep); } if (!req) allow_status (ep); mode = 2; /* reply to extra IN data tokens with a zlp */ } else if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) { if (ep->dev->protocol_stall) { ep->stopped = 1; set_halt (ep); mode = 2; } else if (ep->responded && !req && !ep->stopped) write_fifo (ep, NULL); } } else { /* status; stop NAKing */ if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) { if (ep->dev->protocol_stall) { ep->stopped = 1; set_halt (ep); } mode = 2; /* an extra OUT token is an error */ } else if (((t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)) && req && req->req.actual == req->req.length) || (ep->responded && !req)) { ep->dev->protocol_stall = 1; set_halt (ep); ep->stopped = 1; if (req) done (ep, req, -EOVERFLOW); req = NULL; } } } if (unlikely (!req)) return; /* manual DMA queue advance after short OUT */ if (likely (ep->dma != 0)) { if (t & (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)) { u32 count; int stopped = ep->stopped; /* TRANSFERRED works around OUT_DONE erratum 0112. * we expect (N <= maxpacket) bytes; host wrote M. * iff (M < N) we won't ever see a DMA interrupt. */ ep->stopped = 1; for (count = 0; ; t = readl (&ep->regs->ep_stat)) { /* any preceding dma transfers must finish. * dma handles (M >= N), may empty the queue */ scan_dma_completions (ep); if (unlikely (list_empty (&ep->queue) || ep->out_overflow)) { req = NULL; break; } req = list_entry (ep->queue.next, struct net2280_request, queue); /* here either (M < N), a "real" short rx; * or (M == N) and the queue didn't empty */ if (likely (t & (1 << FIFO_EMPTY))) { count = readl (&ep->dma->dmacount); count &= DMA_BYTE_COUNT_MASK; if (readl (&ep->dma->dmadesc) != req->td_dma) req = NULL; break; } udelay(1); } /* stop DMA, leave ep NAKing */ writel ((1 << DMA_ABORT), &ep->dma->dmastat); spin_stop_dma (ep->dma); if (likely (req)) { req->td->dmacount = 0; t = readl (&ep->regs->ep_avail); dma_done (ep, req, count, (ep->out_overflow || t) ? -EOVERFLOW : 0); } /* also flush to prevent erratum 0106 trouble */ if (unlikely (ep->out_overflow || (ep->dev->chiprev == 0x0100 && ep->dev->gadget.speed == USB_SPEED_FULL))) { out_flush (ep); ep->out_overflow = 0; } /* (re)start dma if needed, stop NAKing */ ep->stopped = stopped; if (!list_empty (&ep->queue)) restart_dma (ep); } else DEBUG (ep->dev, "%s dma ep_stat %08x ??\n", ep->ep.name, t); return; /* data packet(s) received (in the fifo, OUT) */ } else if (t & (1 << DATA_PACKET_RECEIVED_INTERRUPT)) { if (read_fifo (ep, req) && ep->num != 0) mode = 2; /* data packet(s) transmitted (IN) */ } else if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)) { unsigned len; len = req->req.length - req->req.actual; if (len > ep->ep.maxpacket) len = ep->ep.maxpacket; req->req.actual += len; /* if we wrote it all, we're usually done */ if (req->req.actual == req->req.length) { if (ep->num == 0) { /* send zlps until the status stage */ } else if (!req->req.zero || len != ep->ep.maxpacket) mode = 2; } /* there was nothing to do ... */ } else if (mode == 1) return; /* done */ if (mode == 2) { /* stream endpoints often resubmit/unlink in completion */ done (ep, req, 0); /* maybe advance queue to next request */ if (ep->num == 0) { /* NOTE: net2280 could let gadget driver start the * status stage later. since not all controllers let * them control that, the api doesn't (yet) allow it. */ if (!ep->stopped) allow_status (ep); req = NULL; } else { if (!list_empty (&ep->queue) && !ep->stopped) req = list_entry (ep->queue.next, struct net2280_request, queue); else req = NULL; if (req && !ep->is_in) stop_out_naking (ep); } } /* is there a buffer for the next packet? * for best streaming performance, make sure there is one. */ if (req && !ep->stopped) { /* load IN fifo with next packet (may be zlp) */ if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)) write_fifo (ep, &req->req); } } static struct net2280_ep * get_ep_by_addr (struct net2280 *dev, u16 wIndex) { struct net2280_ep *ep; if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0) return &dev->ep [0]; list_for_each_entry (ep, &dev->gadget.ep_list, ep.ep_list) { u8 bEndpointAddress; if (!ep->desc) continue; bEndpointAddress = ep->desc->bEndpointAddress; if ((wIndex ^ bEndpointAddress) & USB_DIR_IN) continue; if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f)) return ep; } return NULL; } static void handle_stat0_irqs (struct net2280 *dev, u32 stat) { struct net2280_ep *ep; u32 num, scratch; /* most of these don't need individual acks */ stat &= ~(1 << INTA_ASSERTED); if (!stat) return; // DEBUG (dev, "irqstat0 %04x\n", stat); /* starting a control request? */ if (unlikely (stat & (1 << SETUP_PACKET_INTERRUPT))) { union { u32 raw [2]; struct usb_ctrlrequest r; } u; int tmp; struct net2280_request *req; if (dev->gadget.speed == USB_SPEED_UNKNOWN) { if (readl (&dev->usb->usbstat) & (1 << HIGH_SPEED)) dev->gadget.speed = USB_SPEED_HIGH; else dev->gadget.speed = USB_SPEED_FULL; net2280_led_speed (dev, dev->gadget.speed); DEBUG(dev, "%s\n", usb_speed_string(dev->gadget.speed)); } ep = &dev->ep [0]; ep->irqs++; /* make sure any leftover request state is cleared */ stat &= ~(1 << ENDPOINT_0_INTERRUPT); while (!list_empty (&ep->queue)) { req = list_entry (ep->queue.next, struct net2280_request, queue); done (ep, req, (req->req.actual == req->req.length) ? 0 : -EPROTO); } ep->stopped = 0; dev->protocol_stall = 0; if (ep->dev->pdev->device == 0x2280) tmp = (1 << FIFO_OVERFLOW) | (1 << FIFO_UNDERFLOW); else tmp = 0; writel (tmp | (1 << TIMEOUT) | (1 << USB_STALL_SENT) | (1 << USB_IN_NAK_SENT) | (1 << USB_IN_ACK_RCVD) | (1 << USB_OUT_PING_NAK_SENT) | (1 << USB_OUT_ACK_SENT) | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT) | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT) | (1 << DATA_PACKET_RECEIVED_INTERRUPT) | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT) | (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | (1 << DATA_IN_TOKEN_INTERRUPT) , &ep->regs->ep_stat); u.raw [0] = readl (&dev->usb->setup0123); u.raw [1] = readl (&dev->usb->setup4567); cpu_to_le32s (&u.raw [0]); cpu_to_le32s (&u.raw [1]); tmp = 0; #define w_value le16_to_cpu(u.r.wValue) #define w_index le16_to_cpu(u.r.wIndex) #define w_length le16_to_cpu(u.r.wLength) /* ack the irq */ writel (1 << SETUP_PACKET_INTERRUPT, &dev->regs->irqstat0); stat ^= (1 << SETUP_PACKET_INTERRUPT); /* watch control traffic at the token level, and force * synchronization before letting the status stage happen. * FIXME ignore tokens we'll NAK, until driver responds. * that'll mean a lot less irqs for some drivers. */ ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0; if (ep->is_in) { scratch = (1 << DATA_PACKET_TRANSMITTED_INTERRUPT) | (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | (1 << DATA_IN_TOKEN_INTERRUPT); stop_out_naking (ep); } else scratch = (1 << DATA_PACKET_RECEIVED_INTERRUPT) | (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | (1 << DATA_IN_TOKEN_INTERRUPT); writel (scratch, &dev->epregs [0].ep_irqenb); /* we made the hardware handle most lowlevel requests; * everything else goes uplevel to the gadget code. */ ep->responded = 1; switch (u.r.bRequest) { case USB_REQ_GET_STATUS: { struct net2280_ep *e; __le32 status; /* hw handles device and interface status */ if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT)) goto delegate; if ((e = get_ep_by_addr (dev, w_index)) == 0 || w_length > 2) goto do_stall; if (readl (&e->regs->ep_rsp) & (1 << SET_ENDPOINT_HALT)) status = cpu_to_le32 (1); else status = cpu_to_le32 (0); /* don't bother with a request object! */ writel (0, &dev->epregs [0].ep_irqenb); set_fifo_bytecount (ep, w_length); writel ((__force u32)status, &dev->epregs [0].ep_data); allow_status (ep); VDEBUG (dev, "%s stat %02x\n", ep->ep.name, status); goto next_endpoints; } break; case USB_REQ_CLEAR_FEATURE: { struct net2280_ep *e; /* hw handles device features */ if (u.r.bRequestType != USB_RECIP_ENDPOINT) goto delegate; if (w_value != USB_ENDPOINT_HALT || w_length != 0) goto do_stall; if ((e = get_ep_by_addr (dev, w_index)) == 0) goto do_stall; if (e->wedged) { VDEBUG(dev, "%s wedged, halt not cleared\n", ep->ep.name); } else { VDEBUG(dev, "%s clear halt\n", ep->ep.name); clear_halt(e); } allow_status (ep); goto next_endpoints; } break; case USB_REQ_SET_FEATURE: { struct net2280_ep *e; /* hw handles device features */ if (u.r.bRequestType != USB_RECIP_ENDPOINT) goto delegate; if (w_value != USB_ENDPOINT_HALT || w_length != 0) goto do_stall; if ((e = get_ep_by_addr (dev, w_index)) == 0) goto do_stall; if (e->ep.name == ep0name) goto do_stall; set_halt (e); allow_status (ep); VDEBUG (dev, "%s set halt\n", ep->ep.name); goto next_endpoints; } break; default: delegate: VDEBUG (dev, "setup %02x.%02x v%04x i%04x l%04x " "ep_cfg %08x\n", u.r.bRequestType, u.r.bRequest, w_value, w_index, w_length, readl (&ep->regs->ep_cfg)); ep->responded = 0; spin_unlock (&dev->lock); tmp = dev->driver->setup (&dev->gadget, &u.r); spin_lock (&dev->lock); } /* stall ep0 on error */ if (tmp < 0) { do_stall: VDEBUG (dev, "req %02x.%02x protocol STALL; stat %d\n", u.r.bRequestType, u.r.bRequest, tmp); dev->protocol_stall = 1; } /* some in/out token irq should follow; maybe stall then. * driver must queue a request (even zlp) or halt ep0 * before the host times out. */ } #undef w_value #undef w_index #undef w_length next_endpoints: /* endpoint data irq ? */ scratch = stat & 0x7f; stat &= ~0x7f; for (num = 0; scratch; num++) { u32 t; /* do this endpoint's FIFO and queue need tending? */ t = 1 << num; if ((scratch & t) == 0) continue; scratch ^= t; ep = &dev->ep [num]; handle_ep_small (ep); } if (stat) DEBUG (dev, "unhandled irqstat0 %08x\n", stat); } #define DMA_INTERRUPTS ( \ (1 << DMA_D_INTERRUPT) \ | (1 << DMA_C_INTERRUPT) \ | (1 << DMA_B_INTERRUPT) \ | (1 << DMA_A_INTERRUPT)) #define PCI_ERROR_INTERRUPTS ( \ (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT) \ | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT) \ | (1 << PCI_RETRY_ABORT_INTERRUPT)) static void handle_stat1_irqs (struct net2280 *dev, u32 stat) { struct net2280_ep *ep; u32 tmp, num, mask, scratch; /* after disconnect there's nothing else to do! */ tmp = (1 << VBUS_INTERRUPT) | (1 << ROOT_PORT_RESET_INTERRUPT); mask = (1 << HIGH_SPEED) | (1 << FULL_SPEED); /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set. * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRRUPT set and * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT * only indicates a change in the reset state). */ if (stat & tmp) { writel (tmp, &dev->regs->irqstat1); if ((((stat & (1 << ROOT_PORT_RESET_INTERRUPT)) && ((readl (&dev->usb->usbstat) & mask) == 0)) || ((readl (&dev->usb->usbctl) & (1 << VBUS_PIN)) == 0) ) && ( dev->gadget.speed != USB_SPEED_UNKNOWN)) { DEBUG (dev, "disconnect %s\n", dev->driver->driver.name); stop_activity (dev, dev->driver); ep0_start (dev); return; } stat &= ~tmp; /* vBUS can bounce ... one of many reasons to ignore the * notion of hotplug events on bus connect/disconnect! */ if (!stat) return; } /* NOTE: chip stays in PCI D0 state for now, but it could * enter D1 to save more power */ tmp = (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT); if (stat & tmp) { writel (tmp, &dev->regs->irqstat1); if (stat & (1 << SUSPEND_REQUEST_INTERRUPT)) { if (dev->driver->suspend) dev->driver->suspend (&dev->gadget); if (!enable_suspend) stat &= ~(1 << SUSPEND_REQUEST_INTERRUPT); } else { if (dev->driver->resume) dev->driver->resume (&dev->gadget); /* at high speed, note erratum 0133 */ } stat &= ~tmp; } /* clear any other status/irqs */ if (stat) writel (stat, &dev->regs->irqstat1); /* some status we can just ignore */ if (dev->pdev->device == 0x2280) stat &= ~((1 << CONTROL_STATUS_INTERRUPT) | (1 << SUSPEND_REQUEST_INTERRUPT) | (1 << RESUME_INTERRUPT) | (1 << SOF_INTERRUPT)); else stat &= ~((1 << CONTROL_STATUS_INTERRUPT) | (1 << RESUME_INTERRUPT) | (1 << SOF_DOWN_INTERRUPT) | (1 << SOF_INTERRUPT)); if (!stat) return; // DEBUG (dev, "irqstat1 %08x\n", stat); /* DMA status, for ep-{a,b,c,d} */ scratch = stat & DMA_INTERRUPTS; stat &= ~DMA_INTERRUPTS; scratch >>= 9; for (num = 0; scratch; num++) { struct net2280_dma_regs __iomem *dma; tmp = 1 << num; if ((tmp & scratch) == 0) continue; scratch ^= tmp; ep = &dev->ep [num + 1]; dma = ep->dma; if (!dma) continue; /* clear ep's dma status */ tmp = readl (&dma->dmastat); writel (tmp, &dma->dmastat); /* chaining should stop on abort, short OUT from fifo, * or (stat0 codepath) short OUT transfer. */ if (!use_dma_chaining) { if ((tmp & (1 << DMA_TRANSACTION_DONE_INTERRUPT)) == 0) { DEBUG (ep->dev, "%s no xact done? %08x\n", ep->ep.name, tmp); continue; } stop_dma (ep->dma); } /* OUT transfers terminate when the data from the * host is in our memory. Process whatever's done. * On this path, we know transfer's last packet wasn't * less than req->length. NAK_OUT_PACKETS may be set, * or the FIFO may already be holding new packets. * * IN transfers can linger in the FIFO for a very * long time ... we ignore that for now, accounting * precisely (like PIO does) needs per-packet irqs */ scan_dma_completions (ep); /* disable dma on inactive queues; else maybe restart */ if (list_empty (&ep->queue)) { if (use_dma_chaining) stop_dma (ep->dma); } else { tmp = readl (&dma->dmactl); if (!use_dma_chaining || (tmp & (1 << DMA_ENABLE)) == 0) restart_dma (ep); else if (ep->is_in && use_dma_chaining) { struct net2280_request *req; __le32 dmacount; /* the descriptor at the head of the chain * may still have VALID_BIT clear; that's * used to trigger changing DMA_FIFO_VALIDATE * (affects automagic zlp writes). */ req = list_entry (ep->queue.next, struct net2280_request, queue); dmacount = req->td->dmacount; dmacount &= cpu_to_le32 ( (1 << VALID_BIT) | DMA_BYTE_COUNT_MASK); if (dmacount && (dmacount & valid_bit) == 0) restart_dma (ep); } } ep->irqs++; } /* NOTE: there are other PCI errors we might usefully notice. * if they appear very often, here's where to try recovering. */ if (stat & PCI_ERROR_INTERRUPTS) { ERROR (dev, "pci dma error; stat %08x\n", stat); stat &= ~PCI_ERROR_INTERRUPTS; /* these are fatal errors, but "maybe" they won't * happen again ... */ stop_activity (dev, dev->driver); ep0_start (dev); stat = 0; } if (stat) DEBUG (dev, "unhandled irqstat1 %08x\n", stat); } static irqreturn_t net2280_irq (int irq, void *_dev) { struct net2280 *dev = _dev; /* shared interrupt, not ours */ if (!(readl(&dev->regs->irqstat0) & (1 << INTA_ASSERTED))) return IRQ_NONE; spin_lock (&dev->lock); /* handle disconnect, dma, and more */ handle_stat1_irqs (dev, readl (&dev->regs->irqstat1)); /* control requests and PIO */ handle_stat0_irqs (dev, readl (&dev->regs->irqstat0)); spin_unlock (&dev->lock); return IRQ_HANDLED; } /*-------------------------------------------------------------------------*/ static void gadget_release (struct device *_dev) { struct net2280 *dev = dev_get_drvdata (_dev); kfree (dev); } /* tear down the binding between this driver and the pci device */ static void net2280_remove (struct pci_dev *pdev) { struct net2280 *dev = pci_get_drvdata (pdev); usb_del_gadget_udc(&dev->gadget); BUG_ON(dev->driver); /* then clean up the resources we allocated during probe() */ net2280_led_shutdown (dev); if (dev->requests) { int i; for (i = 1; i < 5; i++) { if (!dev->ep [i].dummy) continue; pci_pool_free (dev->requests, dev->ep [i].dummy, dev->ep [i].td_dma); } pci_pool_destroy (dev->requests); } if (dev->got_irq) free_irq (pdev->irq, dev); if (dev->regs) iounmap (dev->regs); if (dev->region) release_mem_region (pci_resource_start (pdev, 0), pci_resource_len (pdev, 0)); if (dev->enabled) pci_disable_device (pdev); device_unregister (&dev->gadget.dev); device_remove_file (&pdev->dev, &dev_attr_registers); pci_set_drvdata (pdev, NULL); INFO (dev, "unbind\n"); } /* wrap this driver around the specified device, but * don't respond over USB until a gadget driver binds to us. */ static int net2280_probe (struct pci_dev *pdev, const struct pci_device_id *id) { struct net2280 *dev; unsigned long resource, len; void __iomem *base = NULL; int retval, i; /* alloc, and start init */ dev = kzalloc (sizeof *dev, GFP_KERNEL); if (dev == NULL){ retval = -ENOMEM; goto done; } pci_set_drvdata (pdev, dev); spin_lock_init (&dev->lock); dev->pdev = pdev; dev->gadget.ops = &net2280_ops; dev->gadget.is_dualspeed = 1; /* the "gadget" abstracts/virtualizes the controller */ dev_set_name(&dev->gadget.dev, "gadget"); dev->gadget.dev.parent = &pdev->dev; dev->gadget.dev.dma_mask = pdev->dev.dma_mask; dev->gadget.dev.release = gadget_release; dev->gadget.name = driver_name; /* now all the pci goodies ... */ if (pci_enable_device (pdev) < 0) { retval = -ENODEV; goto done; } dev->enabled = 1; /* BAR 0 holds all the registers * BAR 1 is 8051 memory; unused here (note erratum 0103) * BAR 2 is fifo memory; unused here */ resource = pci_resource_start (pdev, 0); len = pci_resource_len (pdev, 0); if (!request_mem_region (resource, len, driver_name)) { DEBUG (dev, "controller already in use\n"); retval = -EBUSY; goto done; } dev->region = 1; /* FIXME provide firmware download interface to put * 8051 code into the chip, e.g. to turn on PCI PM. */ base = ioremap_nocache (resource, len); if (base == NULL) { DEBUG (dev, "can't map memory\n"); retval = -EFAULT; goto done; } dev->regs = (struct net2280_regs __iomem *) base; dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080); dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100); dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180); dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200); dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300); /* put into initial config, link up all endpoints */ writel (0, &dev->usb->usbctl); usb_reset (dev); usb_reinit (dev); /* irq setup after old hardware is cleaned up */ if (!pdev->irq) { ERROR (dev, "No IRQ. Check PCI setup!\n"); retval = -ENODEV; goto done; } if (request_irq (pdev->irq, net2280_irq, IRQF_SHARED, driver_name, dev) != 0) { ERROR (dev, "request interrupt %d failed\n", pdev->irq); retval = -EBUSY; goto done; } dev->got_irq = 1; /* DMA setup */ /* NOTE: we know only the 32 LSBs of dma addresses may be nonzero */ dev->requests = pci_pool_create ("requests", pdev, sizeof (struct net2280_dma), 0 /* no alignment requirements */, 0 /* or page-crossing issues */); if (!dev->requests) { DEBUG (dev, "can't get request pool\n"); retval = -ENOMEM; goto done; } for (i = 1; i < 5; i++) { struct net2280_dma *td; td = pci_pool_alloc (dev->requests, GFP_KERNEL, &dev->ep [i].td_dma); if (!td) { DEBUG (dev, "can't get dummy %d\n", i); retval = -ENOMEM; goto done; } td->dmacount = 0; /* not VALID */ td->dmaaddr = cpu_to_le32 (DMA_ADDR_INVALID); td->dmadesc = td->dmaaddr; dev->ep [i].dummy = td; } /* enable lower-overhead pci memory bursts during DMA */ writel ( (1 << DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) // 256 write retries may not be enough... // | (1 << PCI_RETRY_ABORT_ENABLE) | (1 << DMA_READ_MULTIPLE_ENABLE) | (1 << DMA_READ_LINE_ENABLE) , &dev->pci->pcimstctl); /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */ pci_set_master (pdev); pci_try_set_mwi (pdev); /* ... also flushes any posted pci writes */ dev->chiprev = get_idx_reg (dev->regs, REG_CHIPREV) & 0xffff; /* done */ INFO (dev, "%s\n", driver_desc); INFO (dev, "irq %d, pci mem %p, chip rev %04x\n", pdev->irq, base, dev->chiprev); INFO (dev, "version: " DRIVER_VERSION "; dma %s\n", use_dma ? (use_dma_chaining ? "chaining" : "enabled") : "disabled"); retval = device_register (&dev->gadget.dev); if (retval) goto done; retval = device_create_file (&pdev->dev, &dev_attr_registers); if (retval) goto done; retval = usb_add_gadget_udc(&pdev->dev, &dev->gadget); if (retval) goto done; return 0; done: if (dev) net2280_remove (pdev); return retval; } /* make sure the board is quiescent; otherwise it will continue * generating IRQs across the upcoming reboot. */ static void net2280_shutdown (struct pci_dev *pdev) { struct net2280 *dev = pci_get_drvdata (pdev); /* disable IRQs */ writel (0, &dev->regs->pciirqenb0); writel (0, &dev->regs->pciirqenb1); /* disable the pullup so the host will think we're gone */ writel (0, &dev->usb->usbctl); } /*-------------------------------------------------------------------------*/ static const struct pci_device_id pci_ids [] = { { .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe), .class_mask = ~0, .vendor = 0x17cc, .device = 0x2280, .subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID, }, { .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe), .class_mask = ~0, .vendor = 0x17cc, .device = 0x2282, .subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID, }, { /* end: all zeroes */ } }; MODULE_DEVICE_TABLE (pci, pci_ids); /* pci driver glue; this is a "new style" PCI driver module */ static struct pci_driver net2280_pci_driver = { .name = (char *) driver_name, .id_table = pci_ids, .probe = net2280_probe, .remove = net2280_remove, .shutdown = net2280_shutdown, /* FIXME add power management support */ }; MODULE_DESCRIPTION (DRIVER_DESC); MODULE_AUTHOR ("David Brownell"); MODULE_LICENSE ("GPL"); static int __init init (void) { if (!use_dma) use_dma_chaining = 0; return pci_register_driver (&net2280_pci_driver); } module_init (init); static void __exit cleanup (void) { pci_unregister_driver (&net2280_pci_driver); } module_exit (cleanup);