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linux_dsm_epyc7002/drivers/usb/gadget/net2280.c
Linus Torvalds 1da177e4c3 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!
2005-04-16 15:20:36 -07:00

2968 lines
77 KiB
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/*
* 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);
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