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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/usb/gadget/net2280.c
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/usb/gadget/net2280.c')
-rw-r--r--drivers/usb/gadget/net2280.c2967
1 files changed, 2967 insertions, 0 deletions
diff --git a/drivers/usb/gadget/net2280.c b/drivers/usb/gadget/net2280.c
new file mode 100644
index 00000000000..e5457f2026c
--- /dev/null
+++ b/drivers/usb/gadget/net2280.c
@@ -0,0 +1,2967 @@
+/*
+ * 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 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.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#undef DEBUG /* messages on error and most fault paths */
+#undef VERBOSE /* extra debug messages (success too) */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/smp_lock.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 <asm/byteorder.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/unaligned.h>
+
+
+#define DRIVER_DESC "PLX NET2280 USB Peripheral Controller"
+#define DRIVER_VERSION "2005 Feb 03"
+
+#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 *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 acceptible for
+ * self-powered devices, and helps avoid some quirks.
+ */
+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 __constant_cpu_to_le32 (1 << VALID_BIT)
+#define dma_done_ie __constant_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 = le16_to_cpu (desc->wMaxPacketSize) & 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->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);
+
+ 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)
+ | 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 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 (&regs->pciirqenb0);
+ tmp &= ~(1 << ep->num);
+ writel (tmp, &regs->pciirqenb0);
+ } else {
+ tmp = readl (&regs->pciirqenb1);
+ tmp &= ~(1 << (8 + ep->num)); /* completion */
+ writel (tmp, &regs->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)
+ */
+ tmp = (1 << SET_NAK_OUT_PACKETS_MODE)
+ | (1 << SET_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 */
+ writel ( (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_OVERFLOW)
+ | (1 << FIFO_UNDERFLOW)
+ | (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, int gfp_flags)
+{
+ struct net2280_ep *ep;
+ struct net2280_request *req;
+
+ if (!_ep)
+ return NULL;
+ ep = container_of (_ep, struct net2280_ep, ep);
+
+ req = kmalloc (sizeof *req, gfp_flags);
+ if (!req)
+ return NULL;
+
+ memset (req, 0, sizeof *req);
+ 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 = __constant_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);
+}
+
+/*-------------------------------------------------------------------------*/
+
+#undef USE_KMALLOC
+
+/* many common platforms have dma-coherent caches, which means that it's
+ * safe to use kmalloc() memory for all i/o buffers without using any
+ * cache flushing calls. (unless you're trying to share cache lines
+ * between dma and non-dma activities, which is a slow idea in any case.)
+ *
+ * other platforms need more care, with 2.5 having a moderately general
+ * solution (which falls down for allocations smaller than one page)
+ * that improves significantly on the 2.4 PCI allocators by removing
+ * the restriction that memory never be freed in_interrupt().
+ */
+#if defined(CONFIG_X86)
+#define USE_KMALLOC
+
+#elif defined(CONFIG_PPC) && !defined(CONFIG_NOT_COHERENT_CACHE)
+#define USE_KMALLOC
+
+#elif defined(CONFIG_MIPS) && !defined(CONFIG_NONCOHERENT_IO)
+#define USE_KMALLOC
+
+/* FIXME there are other cases, including an x86-64 one ... */
+#endif
+
+/* allocating buffers this way eliminates dma mapping overhead, which
+ * on some platforms will mean eliminating a per-io buffer copy. with
+ * some kinds of system caches, further tweaks may still be needed.
+ */
+static void *
+net2280_alloc_buffer (
+ struct usb_ep *_ep,
+ unsigned bytes,
+ dma_addr_t *dma,
+ int gfp_flags
+)
+{
+ void *retval;
+ struct net2280_ep *ep;
+
+ ep = container_of (_ep, struct net2280_ep, ep);
+ if (!_ep)
+ return NULL;
+ *dma = DMA_ADDR_INVALID;
+
+#if defined(USE_KMALLOC)
+ retval = kmalloc(bytes, gfp_flags);
+ if (retval)
+ *dma = virt_to_phys(retval);
+#else
+ if (ep->dma) {
+ /* the main problem with this call is that it wastes memory
+ * on typical 1/N page allocations: it allocates 1-N pages.
+ */
+#warning Using dma_alloc_coherent even with buffers smaller than a page.
+ retval = dma_alloc_coherent(&ep->dev->pdev->dev,
+ bytes, dma, gfp_flags);
+ } else
+ retval = kmalloc(bytes, gfp_flags);
+#endif
+ return retval;
+}
+
+static void
+net2280_free_buffer (
+ struct usb_ep *_ep,
+ void *buf,
+ dma_addr_t dma,
+ unsigned bytes
+) {
+ /* free memory into the right allocator */
+#ifndef USE_KMALLOC
+ if (dma != DMA_ADDR_INVALID) {
+ struct net2280_ep *ep;
+
+ ep = container_of(_ep, struct net2280_ep, ep);
+ if (!_ep)
+ return;
+ dma_free_coherent(&ep->dev->pdev->dev, bytes, buf, dma);
+ } else
+#endif
+ kfree (buf);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* 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, &regs->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, &regs->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 (&regs->ep_avail);
+ if (unlikely (count == 0)) {
+ udelay (1);
+ tmp = readl (&ep->regs->ep_stat);
+ count = readl (&regs->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 (&regs->ep_data);
+ cpu_to_le32s (&tmp);
+ put_unaligned (tmp, (u32 *)buf);
+ buf += 4;
+ count -= 4;
+ }
+ if (count) {
+ tmp = readl (&regs->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);
+ else if ((dmacount % ep->ep.maxpacket) != 0)
+ 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_le32p (&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;
+
+ writel ((1 << VALID_BIT) | (ep->is_in << DMA_DIRECTION),
+ &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 |= __constant_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, int 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. */
+
+ 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) {
+ WARN (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) {
+ u32 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)
+ | 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 (struct usb_ep *_ep, int value)
+{
+ 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 halt\n", _ep->name,
+ value ? "set" : "clear");
+ /* set/clear, then synch memory views with the device */
+ if (value) {
+ if (ep->num == 0)
+ ep->dev->protocol_stall = 1;
+ else
+ set_halt (ep);
+ } else
+ clear_halt (ep);
+ (void) readl (&ep->regs->ep_rsp);
+ }
+ spin_unlock_irqrestore (&ep->dev->lock, flags);
+
+ return retval;
+}
+
+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 struct usb_ep_ops net2280_ep_ops = {
+ .enable = net2280_enable,
+ .disable = net2280_disable,
+
+ .alloc_request = net2280_alloc_request,
+ .free_request = net2280_free_request,
+
+ .alloc_buffer = net2280_alloc_buffer,
+ .free_buffer = net2280_free_buffer,
+
+ .queue = net2280_queue,
+ .dequeue = net2280_dequeue,
+
+ .set_halt = net2280_set_halt,
+ .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 const struct usb_gadget_ops net2280_ops = {
+ .get_frame = net2280_get_frame,
+ .wakeup = net2280_wakeup,
+ .set_selfpowered = net2280_set_selfpowered,
+ .pullup = net2280_pullup,
+};
+
+/*-------------------------------------------------------------------------*/
+
+#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, 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
+show_registers (struct device *_dev, char *buf)
+{
+ struct net2280 *dev;
+ char *next;
+ unsigned size, t;
+ unsigned long flags;
+ int i;
+ u32 t1, t2;
+ 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, show_registers, NULL);
+
+static ssize_t
+show_queues (struct device *_dev, 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; }),
+ le16_to_cpu (d->wMaxPacketSize) & 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) do {} while (0)
+#define device_remove_file device_create_file
+
+#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);
+}
+
+/**
+ * net2280_set_fifo_mode - change allocation of fifo buffers
+ * @gadget: access to the net2280 device that will be updated
+ * @mode: 0 for default, four 1kB buffers (ep-a through ep-d);
+ * 1 for two 2kB buffers (ep-a and ep-b only);
+ * 2 for one 2kB buffer (ep-a) and two 1kB ones (ep-b, ep-c).
+ *
+ * returns zero on success, else negative errno. when this succeeds,
+ * the contents of gadget->ep_list may have changed.
+ *
+ * you may only call this function when endpoints a-d are all disabled.
+ * use it whenever extra hardware buffering can help performance, such
+ * as before enabling "high bandwidth" interrupt endpoints that use
+ * maxpacket bigger than 512 (when double buffering would otherwise
+ * be unavailable).
+ */
+int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode)
+{
+ int i;
+ struct net2280 *dev;
+ int status = 0;
+ unsigned long flags;
+
+ if (!gadget)
+ return -ENODEV;
+ dev = container_of (gadget, struct net2280, gadget);
+
+ spin_lock_irqsave (&dev->lock, flags);
+
+ for (i = 1; i <= 4; i++)
+ if (dev->ep [i].desc) {
+ status = -EINVAL;
+ break;
+ }
+ if (mode < 0 || mode > 2)
+ status = -EINVAL;
+ if (status == 0)
+ set_fifo_mode (dev, mode);
+ spin_unlock_irqrestore (&dev->lock, flags);
+
+ if (status == 0) {
+ if (mode == 1)
+ DEBUG (dev, "fifo: ep-a 2K, ep-b 2K\n");
+ else if (mode == 2)
+ DEBUG (dev, "fifo: ep-a 2K, ep-b 1K, ep-c 1K\n");
+ /* else all are 1K */
+ }
+ return status;
+}
+EXPORT_SYMBOL (net2280_set_fifo_mode);
+
+/*-------------------------------------------------------------------------*/
+
+/* 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 struct net2280 *the_controller;
+
+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.
+ */
+int usb_gadget_register_driver (struct usb_gadget_driver *driver)
+{
+ struct net2280 *dev = the_controller;
+ 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->bind
+ || !driver->unbind
+ || !driver->setup)
+ return -EINVAL;
+ if (!dev)
+ return -ENODEV;
+ if (dev->driver)
+ return -EBUSY;
+
+ 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 = driver->bind (&dev->gadget);
+ if (retval) {
+ DEBUG (dev, "bind to driver %s --> %d\n",
+ driver->driver.name, retval);
+ dev->driver = NULL;
+ dev->gadget.dev.driver = NULL;
+ return retval;
+ }
+
+ device_create_file (&dev->pdev->dev, &dev_attr_function);
+ device_create_file (&dev->pdev->dev, &dev_attr_queues);
+
+ /* ... 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;
+}
+EXPORT_SYMBOL (usb_gadget_register_driver);
+
+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]);
+
+ /* report disconnect; the driver is already quiesced */
+ if (driver) {
+ spin_unlock (&dev->lock);
+ driver->disconnect (&dev->gadget);
+ spin_lock (&dev->lock);
+ }
+
+ usb_reinit (dev);
+}
+
+int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
+{
+ struct net2280 *dev = the_controller;
+ unsigned long flags;
+
+ if (!dev)
+ return -ENODEV;
+ if (!driver || driver != dev->driver)
+ return -EINVAL;
+
+ spin_lock_irqsave (&dev->lock, flags);
+ stop_activity (dev, driver);
+ spin_unlock_irqrestore (&dev->lock, flags);
+
+ net2280_pullup (&dev->gadget, 0);
+
+ driver->unbind (&dev->gadget);
+ 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;
+}
+EXPORT_SYMBOL (usb_gadget_unregister_driver);
+
+
+/*-------------------------------------------------------------------------*/
+
+/* 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
+ writel (t & ~(1 << NAK_OUT_PACKETS), &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 (!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)
+ || !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, t);
+ }
+
+ /* 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) {
+ /* wait for control status */
+ if (mode != 2)
+ req = NULL;
+ } 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 = 0;
+ 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 speed\n",
+ (dev->gadget.speed == USB_SPEED_HIGH)
+ ? "high" : "full");
+ }
+
+ 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;
+ writel ( (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_OVERFLOW)
+ | (1 << FIFO_UNDERFLOW)
+ | (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]);
+
+ le16_to_cpus (&u.r.wValue);
+ le16_to_cpus (&u.r.wIndex);
+ le16_to_cpus (&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.
+ */
+ switch (u.r.bRequest) {
+ case USB_REQ_GET_STATUS: {
+ struct net2280_ep *e;
+ u16 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, u.r.wIndex)) == 0
+ || u.r.wLength > 2)
+ goto do_stall;
+
+ if (readl (&e->regs->ep_rsp)
+ & (1 << SET_ENDPOINT_HALT))
+ status = __constant_cpu_to_le16 (1);
+ else
+ status = __constant_cpu_to_le16 (0);
+
+ /* don't bother with a request object! */
+ writel (0, &dev->epregs [0].ep_irqenb);
+ set_fifo_bytecount (ep, u.r.wLength);
+ writel (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 (u.r.wValue != USB_ENDPOINT_HALT
+ || u.r.wLength != 0)
+ goto do_stall;
+ if ((e = get_ep_by_addr (dev, u.r.wIndex)) == 0)
+ goto do_stall;
+ clear_halt (e);
+ allow_status (ep);
+ VDEBUG (dev, "%s clear halt\n", ep->ep.name);
+ 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 (u.r.wValue != USB_ENDPOINT_HALT
+ || u.r.wLength != 0)
+ goto do_stall;
+ if ((e = get_ep_by_addr (dev, u.r.wIndex)) == 0)
+ 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 "
+ "ep_cfg %08x\n",
+ u.r.bRequestType, u.r.bRequest,
+ u.r.wValue, u.r.wIndex,
+ readl (&ep->regs->ep_cfg));
+ 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.
+ */
+ }
+
+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 */
+ stat &= ~((1 << CONTROL_STATUS_INTERRUPT)
+ | (1 << SUSPEND_REQUEST_INTERRUPT)
+ | (1 << RESUME_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;
+ u32 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 &= __constant_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 pt_regs * r)
+{
+ struct net2280 *dev = _dev;
+
+ 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);
+
+ /* start with the driver above us */
+ if (dev->driver) {
+ /* should have been done already by driver model core */
+ WARN (dev, "pci remove, driver '%s' is still registered\n",
+ dev->driver->driver.name);
+ usb_gadget_unregister_driver (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");
+
+ the_controller = NULL;
+}
+
+/* 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;
+ char buf [8], *bufp;
+
+ /* if you want to support more than one controller in a system,
+ * usb_gadget_driver_{register,unregister}() must change.
+ */
+ if (the_controller) {
+ dev_warn (&pdev->dev, "ignoring\n");
+ return -EBUSY;
+ }
+
+ /* alloc, and start init */
+ dev = kmalloc (sizeof *dev, SLAB_KERNEL);
+ if (dev == NULL){
+ retval = -ENOMEM;
+ goto done;
+ }
+
+ memset (dev, 0, sizeof *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 */
+ strcpy (dev->gadget.dev.bus_id, "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;
+
+ 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;
+ }
+#ifndef __sparc__
+ scnprintf (buf, sizeof buf, "%d", pdev->irq);
+ bufp = buf;
+#else
+ bufp = __irq_itoa(pdev->irq);
+#endif
+ if (request_irq (pdev->irq, net2280_irq, SA_SHIRQ, driver_name, dev)
+ != 0) {
+ ERROR (dev, "request interrupt %s failed\n", bufp);
+ 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 = __constant_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_set_mwi (pdev);
+
+ /* ... also flushes any posted pci writes */
+ dev->chiprev = get_idx_reg (dev->regs, REG_CHIPREV) & 0xffff;
+
+ /* done */
+ pci_set_drvdata (pdev, dev);
+ INFO (dev, "%s\n", driver_desc);
+ INFO (dev, "irq %s, pci mem %p, chip rev %04x\n",
+ bufp, base, dev->chiprev);
+ INFO (dev, "version: " DRIVER_VERSION "; dma %s\n",
+ use_dma
+ ? (use_dma_chaining ? "chaining" : "enabled")
+ : "disabled");
+ the_controller = dev;
+
+ device_register (&dev->gadget.dev);
+ device_create_file (&pdev->dev, &dev_attr_registers);
+
+ return 0;
+
+done:
+ if (dev)
+ net2280_remove (pdev);
+ return retval;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+static 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,
+
+}, { /* 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,
+
+ /* 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);