| /* |
| * Driver for the PLX NET2280 USB device controller. |
| * Specs and errata are available from <http://www.plxtech.com>. |
| * |
| * 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 Mass 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 <linux/module.h> |
| #include <linux/pci.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/kernel.h> |
| #include <linux/delay.h> |
| #include <linux/ioport.h> |
| #include <linux/slab.h> |
| #include <linux/errno.h> |
| #include <linux/init.h> |
| #include <linux/timer.h> |
| #include <linux/list.h> |
| #include <linux/interrupt.h> |
| #include <linux/moduleparam.h> |
| #include <linux/device.h> |
| #include <linux/usb/ch9.h> |
| #include <linux/usb/gadget.h> |
| #include <linux/prefetch.h> |
| |
| #include <asm/byteorder.h> |
| #include <asm/io.h> |
| #include <asm/irq.h> |
| #include <asm/unaligned.h> |
| |
| |
| #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 bool use_dma = 1; |
| static bool 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 bool enable_suspend = 0; |
| |
| /* "modprobe net2280 enable_suspend=1" etc */ |
| module_param (enable_suspend, bool, S_IRUGO); |
| |
| /* force full-speed operation */ |
| static bool full_speed; |
| module_param(full_speed, bool, 0444); |
| MODULE_PARM_DESC(full_speed, "force full-speed mode -- for testing only!"); |
| |
| #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 (ep->dma) |
| usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in); |
| |
| 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) { |
| int ret; |
| |
| ret = usb_gadget_map_request(&dev->gadget, _req, |
| ep->is_in); |
| if (ret) |
| return ret; |
| } |
| |
| #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<<CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)) |
| ? "status " : "", |
| (t2 & (1 << CLEAR_NAK_OUT_PACKETS_MODE)) |
| ? "NAKmode " : "", |
| (t2 & (1 << CLEAR_ENDPOINT_TOGGLE)) |
| ? "DATA1 " : "DATA0 ", |
| (t2 & (1 << CLEAR_ENDPOINT_HALT)) |
| ? "HALT " : "", |
| readl (&ep->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->max_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; |
| |
| /* Enable force-full-speed testing mode, if desired */ |
| if (full_speed) |
| writel(1 << FORCE_FULL_SPEED_MODE, &dev->usb->xcvrdiag); |
| |
| /* ... 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); |
| |
| /* Disable full-speed test mode */ |
| writel(0, &dev->usb->xcvrdiag); |
| |
| 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_INTERRUPT 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_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.max_speed = USB_SPEED_HIGH; |
| |
| /* the "gadget" abstracts/virtualizes the controller */ |
| 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_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); |
| |
| /* Disable full-speed test mode */ |
| writel(0, &dev->usb->xcvrdiag); |
| } |
| |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| 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); |