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Commit 4ff981ae authored by David Brownell's avatar David Brownell Committed by Greg Kroah-Hartman
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[PATCH] Net2280 driver (2/6) 

This patch creates drivers/usb/gadget/net2280.[hc],
providing a driver for NetChip's "Net2280 PCI USB 2.0
High Speed Peripheral Controller".

It implements the API included in the first patch.

The driver has behaved well with chiprev 0100 under
stress tests with Gadget Zero and the ethernet model
driver, and has passed sanity tests for chiprev 0110.
parent 6f075fe5
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drivers/usb/gadget/net2280.c 0 → 100644
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/*
* Driver for the NetChip 2280 USB device controller.
* Specs and errata are available from <http://www.netchip.com>.
*
* NetChip Technology Inc. supported the development of this driver.
*
*
* CODE STATUS HIGHLIGHTS
*
* Used with a gadget driver like "zero.c" this enumerates fine to Windows
* or Linux hosts; handles disconnect, reconnect, and reset, for full or
* high speed operation; and passes USB-IF "chapter 9" tests.
*
* Handles standard stress loads from the Linux "usbtest" driver, with
* either DMA (default) or PIO (use_dma=n) used for ep-{a,b,c,d}. Testing
* with "ttcp" (and the "ether.c" driver) behaves nicely too.
*
* DMA is enabled by default, and drivers using transfer queues will 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.
*/
// #define NET2280_DMA_OUT_WORKAROUND
#define USE_DMA_CHAINING
/*
* Copyright (C) 2003 David Brownell
*
* 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
*/
#define DEBUG 1
// #define 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/version.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 "NetChip 2280 USB Peripheral Controller"
#define DRIVER_VERSION "May Day 2003"
#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",
};
static int use_dma = 1;
#ifdef HAVE_DRIVER_MODEL
#include <linux/moduleparam.h>
/* "modprobe net2280 use_dma=n" etc */
module_param (use_dma, bool, S_IRUGO|S_IWUSR);
#else
/* use zero/nonzero for older versions */
MODULE_PARM (use_dma, "i");
MODULE_PARM_DESC (use_dma, "true to use dma controllers");
#endif
#include "net2280.h"
#define valid_bit cpu_to_le32 (1 << VALID_BIT)
#define dma_done_ie cpu_to_le32 (1 << DMA_DONE_INTERRUPT_ENABLE)
/*-------------------------------------------------------------------------*/
#define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
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";
}
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;
/* 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->is_in && ep->dma && (max % 4) != 0) {
DEBUG (ep->dev, "%s, no IN dma for maxpacket %d\n",
ep->ep.name, ep->ep.maxpacket);
ep->dma = 0;
}
/* 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) {
/* not just because of erratum 0105; avoid ever
* kicking in the "toggle-irrelevant" mode.
*/
tmp = USB_ENDPOINT_XFER_BULK;
}
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);
#ifdef NET2280_DMA_OUT_WORKAROUND
if (!ep->is_in)
ep->dma = 0;
#endif
/* 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 *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);
#ifdef DEBUG
if (done == 0) dump_stack (); /* ignore out_flush timeout */
#endif
return -ETIMEDOUT;
}
static struct usb_ep_ops net2280_ep_ops;
static void ep_reset (struct net2280_regs *regs, struct net2280_ep *ep)
{
u32 tmp;
ep->desc = 0;
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)
*/
writel ( (1 << SET_NAK_OUT_PACKETS_MODE)
| (1 << SET_NAK_OUT_PACKETS)
| (1 << CLEAR_EP_HIDE_STATUS_PHASE)
| (1 << CLEAR_INTERRUPT_MODE)
| (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)
| (1 << CLEAR_ENDPOINT_TOGGLE)
| (1 << CLEAR_ENDPOINT_HALT)
, &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 0;
ep = container_of (_ep, struct net2280_ep, ep);
req = kmalloc (sizeof *req, gfp_flags);
if (!req)
return 0;
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 0;
}
td->dmacount = 0; /* not VALID */
td->dmaaddr = cpu_to_le32 (DMA_ADDR_INVALID);
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 || (!ep->desc && ep->num != 0))
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 define(CONFIG_PPC) && !defined(CONFIG_NOT_COHERENT_CACHE)
#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 || (!ep->desc && ep->num != 0))
return 0;
*dma = DMA_ADDR_INVALID;
if (ep->dma) {
#if defined(USE_KMALLOC)
retval = kmalloc (bytes, gfp_flags);
if (retval)
*dma = virt_to_phys (retval);
#elif LINUX_VERSION_CODE > KERNEL_VERSION(2,5,58)
#warning Using dma_alloc_consistent even with sub-page allocations
/* the main problem with this call is that it wastes memory
* on typical 1/N page allocations: it allocates 1-N pages.
*/
retval = dma_alloc_coherent (&ep->dev->pdev->dev,
bytes, dma, gfp_flags);
#else
#error No dma-coherent memory allocator is available
/* pci_alloc_consistent works, but pci_free_consistent()
* isn't safe in_interrupt(). plus, in addition to the
* 1/Nth page weakness, it doesn't understand gfp_flags.
*/
#endif
} else
retval = kmalloc (bytes, gfp_flags);
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)
dma_free_coherent (ep->dev->pdev, bytes, 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 *regs = ep->regs;
u8 *buf;
unsigned count, total;
/* INVARIANT: fifo is currently empty. (testable) */
if (req) {
total = req->length - req->actual;
buf = req->buf + req->actual;
} else {
total = 0;
buf = 0;
}
/* write just one packet at a time */
count = min (ep->ep.maxpacket, 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.
*/
writel (get_unaligned ((u32 *)buf), &regs->ep_data);
buf += 4;
count -= 4;
}
/* last fifo entry is "short" unless we wrote a full packet */
if (total < ep->ep.maxpacket) {
u32 tmp = count ? get_unaligned ((u32 *)buf) : count;
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.
*/
static void out_flush (struct net2280_ep *ep)
{
u32 *statp, 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)) {
unsigned usec;
if (ep->dev->gadget.speed == USB_SPEED_HIGH) {
if (ep->ep.maxpacket <= 512)
usec = 10; /* 512 byte bulk */
else
usec = 21; /* 1024 byte interrupt */
} else
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 *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) {
tmp = readl (&ep->regs->ep_stat);
if ((tmp & (1 << NAK_OUT_PACKETS)))
/* cleanup = 1 */;
else if ((tmp & (1 << FIFO_FULL))
/* don't break hs PING protocol ... */
|| ep->dev->gadget.speed == USB_SPEED_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.
*/
count = readl (&regs->ep_avail);
tmp = req->req.length - req->req.actual;
if (count > tmp) {
unsigned over = tmp % ep->ep.maxpacket;
/* FIXME handle this consistently between PIO and DMA */
if (over) {
ERROR (ep->dev,
"%s out fifo %d bytes, over %d extra %d\n",
ep->ep.name, count, over, count - tmp);
req->req.status = -EOVERFLOW;
tmp -= over;
}
count = tmp;
}
req->req.actual += count;
/* FIXME we seem to be getting these w/o ZLPs; why? */
if (req->req.actual == 0 && req->req.length != 0) {
VDEBUG (ep->dev, "%s pio out -- bogus zlp?\n", ep->ep.name);
return 0;
}
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) {
put_unaligned (readl (&regs->ep_data), (u32 *)buf);
buf += 4;
count -= 4;
}
if (count) {
tmp = readl (&regs->ep_data);
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 inline 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.
*/
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);
#ifdef USE_DMA_CHAINING
if (!req->req.no_interrupt)
#endif
dmacount |= (1 << DMA_DONE_INTERRUPT_ENABLE);
/* td->dmadesc = previously set by caller */
td->dmaaddr = cpu_to_le32p (&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_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 *dma)
{
handshake (&dma->dmactl, (1 << DMA_ENABLE), 0, 50);
}
static inline void stop_dma (struct net2280_dma_regs *dma)
{
writel (dmactl_default & ~(1 << DMA_ENABLE), &dma->dmactl);
spin_stop_dma (dma);
}
static void start_dma (struct net2280_ep *ep, struct net2280_request *req)
{
u32 tmp;
int clear_nak = 0;
struct net2280_dma_regs *dma = ep->dma;
/* FIXME can't use DMA for ZLPs */
/* 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 == 0)
clear_nak = 1;
else {
/* 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);
writel ((1 << DMA_ENABLE), &dma->dmactl);
writel ((1 << DMA_START), &dma->dmastat);
return;
}
}
/* on this path we know there's no dma queue (yet) */
WARN_ON (readl (&dma->dmactl) & (1 << DMA_ENABLE));
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);
#ifdef USE_DMA_CHAINING
writel ( (1 << VALID_BIT)
| (ep->is_in << DMA_DIRECTION)
| 0, &dma->dmacount);
#else
req->td->dmacount |= cpu_to_le32 (1 << END_OF_CHAIN);
#endif
writel (req->td_dma, &dma->dmadesc);
writel (tmp, &dma->dmactl);
/* erratum 0116 workaround part 3: pci arbiter away from net2280 */
(void) readl (&ep->dev->pci->pcimstctl);
writel ((1 << DMA_START), &dma->dmastat);
/* recover from previous short read; erratum 0112 workaround #1 */
if (clear_nak)
writel ((1 << CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
}
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;
/* 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;
req->dma_done = 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)
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);
/* don't queue it */
req = 0;
} 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) {
done:
list_add_tail (&req->queue, &ep->queue);
}
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);
rmb ();
done (ep, req, status);
}
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"
* packets, including overruns, even when the transfer was
* exactly the length requested (dmacount now zero).
*/
if (!ep->is_in && (req->req.length % ep->ep.maxpacket) != 0) {
req->dma_done = 1;
break;
}
dma_done (ep, req, tmp, 0);
}
}
static void restart_dma (struct net2280_ep *ep)
{
struct net2280_request *req;
if (ep->stopped)
return;
req = list_entry (ep->queue.next, struct net2280_request, queue);
#ifdef USE_DMA_CHAINING
/* the 2280 will be processing the queue unless queue hiccups after
* the previous transfer:
* IN: wanted automagic zlp, head doesn't (or vice versa)
* OUT: was "usb-short", we must restart.
*/
if (!req->valid) {
struct net2280_request *entry, *prev = 0;
int qmode, reqmode, done = 0;
DEBUG (ep->dev, "%s dma hiccup td %p\n", ep->ep.name, req->td);
qmode = likely (req->req.zero
|| (req->req.length % ep->ep.maxpacket) != 0);
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 == qmode) {
entry->valid = 1;
dmacount |= valid_bit;
entry->td->dmacount = dmacount;
prev = entry;
continue;
} else {
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;
}
start_dma (ep, req);
} else if (!ep->is_in
&& (readl (&ep->regs->ep_stat)
& (1 << NAK_OUT_PACKETS)) != 0)
start_dma (ep, req);
#else
start_dma (ep, req);
#endif
}
static inline void abort_dma (struct net2280_ep *ep)
{
/* abort the current transfer */
writel ((1 << DMA_ABORT), &ep->dma->dmastat);
/* collect completed transfers (except the current one) */
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);
req = container_of (_req, struct net2280_request, req);
if (!_ep || (!ep->desc && ep->num != 0) || !_req)
return -EINVAL;
spin_lock_irqsave (&ep->dev->lock, flags);
stopped = ep->stopped;
/* pause dma while we scan the queue */
dmactl = 0;
ep->stopped = 1;
if (ep->dma) {
dmactl = readl (&ep->dma->dmactl);
writel (dmactl & ~(1 << DMA_ENABLE), &ep->dma->dmactl);
/* force synch, clean any completed requests */
spin_stop_dma (ep->dma);
scan_dma_completions (ep);
}
/* 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))
dma_done (ep, req,
le32_to_cpup (&req->td->dmacount),
-ECONNRESET);
} else {
DEBUG (ep->dev, "unlink (%s) pio\n", _ep->name);
done (ep, req, -ECONNRESET);
}
req = 0;
#ifdef USE_DMA_CHAINING
/* patch up hardware chaining data */
} else if (ep->dma) {
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;
}
#endif
}
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 req ? 0 : -EOPNOTSUPP;
}
/*-------------------------------------------------------------------------*/
static int
net2280_set_halt (struct usb_ep *_ep, int value)
{
struct net2280_ep *ep;
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->bmAttributes & 0x03) == USB_ENDPOINT_XFER_ISOC)
return -EINVAL;
VDEBUG (ep->dev, "%s %s halt\n", _ep->name, value ? "set" : "clear");
/* set/clear, then synch memory views with the device */
if (value)
set_halt (ep);
else
clear_halt (ep);
(void) readl (&ep->regs->ep_rsp);
return 0;
}
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 -EINVAL;
if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
return -ESHUTDOWN;
avail = readl (&ep->regs->ep_avail);
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;
if (!_gadget)
return 0;
dev = container_of (_gadget, struct net2280, gadget);
writel (1 << GENERATE_RESUME, dev->usb->usbstat);
/* pci writes may still be posted */
return 0;
}
static const struct usb_gadget_ops net2280_ops = {
.get_frame = net2280_get_frame,
.wakeup = net2280_wakeup,
// .set_selfpowered = net2280_set_selfpowered,
};
/*-------------------------------------------------------------------------*/
#ifdef HAVE_DRIVER_MODEL
/* "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 snprintf (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 = snprintf (next, size, "%s " DRIVER_VERSION "\n"
"devinit %03x fifoctl %08x gadget '%s'\n"
"pci irqenb0 %02x irqenb1 %08x "
"irqstat0 %04x irqstat1 %08x\n",
driver_name,
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 = snprintf (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);
t = snprintf (next, size,
"%s\tcfg %05x rsp %02x enb %02x ",
ep->ep.name, t1,
readl (&ep->regs->ep_rsp) & 0xff,
readl (&ep->regs->ep_irqenb));
size -= t;
next += t;
t = snprintf (next, size,
"stat %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 = snprintf (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 = snprintf (next, size, "irqs: ");
size -= t;
next += t;
for (i = 0; i < 7; i++) {
struct net2280_ep *ep;
ep = &dev->ep [i];
if (i && !ep->irqs)
continue;
t = snprintf (next, size, " %s/%ld", ep->ep.name, ep->irqs);
size -= t;
next += t;
}
t = snprintf (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 = snprintf (next, size,
"%s (ep%d%s-%s) max %04x %s\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"
);
} else /* ep0 should only have one transfer queued */
t = snprintf (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 = snprintf (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 = snprintf (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 = snprintf (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;
}
}
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;
/* force immediate bus disconnect, and synch through pci */
writel (0, &dev->usb->usbctl);
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++) {
writel ((1 << DMA_ABORT), &dev->dma [tmp].dmastat);
stop_dma (&dev->dma [tmp]);
}
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, 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 << SET_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)
| (1 << USB_DETECT_ENABLE)
| (1 << DEVICE_REMOTE_WAKEUP_ENABLE)
, &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)
, &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->driver = driver;
#ifdef HAVE_DRIVER_MODEL
dev->gadget.dev.driver = &driver->driver;
#endif
retval = driver->bind (&dev->gadget);
if (retval) {
DEBUG (dev, "bind to driver %s --> %d\n",
driver->driver.name, retval);
dev->driver = 0;
#ifdef HAVE_DRIVER_MODEL
dev->gadget.dev.driver = 0;
#endif
return retval;
}
#ifdef HAVE_DRIVER_MODEL
// FIXME
// driver_register (&driver->driver);
// device_register (&dev->gadget.dev);
#endif
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 = 0;
/* 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);
driver->unbind (&dev->gadget);
dev->driver = 0;
net2280_led_active (dev, 0);
device_remove_file (&dev->pdev->dev, &dev_attr_function);
device_remove_file (&dev->pdev->dev, &dev_attr_queues);
// FIXME
// device_unregister()
// driver_unregister (&driver->driver);
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 = 0;
/* 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)
set_halt (ep);
mode = 2;
/* reply to extra IN tokens with a zlp */
} else if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) {
if (ep->dev->protocol_stall) {
set_halt (ep);
mode = 2;
} else if (!req)
write_fifo (ep, 0);
}
} else {
/* status; stop NAKing */
if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) {
if (ep->dev->protocol_stall)
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 = 0;
}
}
}
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;
/* 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.
*/
count = readl (&ep->dma->dmacount);
count &= DMA_BYTE_COUNT_MASK;
if (!req->dma_done) {
/* dma can finish with the FIFO non-empty,
* on (M > N) errors.
*/
while (count && (t & (1 << FIFO_EMPTY)) == 0) {
cpu_relax ();
t = readl (&ep->regs->ep_stat);
count = readl (&ep->dma->dmacount);
count &= DMA_BYTE_COUNT_MASK;
}
}
/* stop DMA, leave ep NAKing */
writel ((1 << DMA_ABORT), &ep->dma->dmastat);
spin_stop_dma (ep->dma);
/* buffer might have been too small */
t = readl (&ep->regs->ep_avail);
if (t != 0)
DEBUG (ep->dev, "%s dma, discard %d len %d\n",
ep->ep.name, t, count);
dma_done (ep, req, count, t ? -EOVERFLOW : 0);
/* also flush to prevent erratum 0106 trouble */
if (t || ep->dev->chiprev == 0x0100)
out_flush (ep);
/* restart dma (still NAKing OUT!) if needed */
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;
len = min (ep->ep.maxpacket, len);
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 = 0;
} 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) {
allow_status (ep);
req = 0;
} else {
if (!list_empty (&ep->queue) && !ep->stopped)
req = list_entry (ep->queue.next,
struct net2280_request, queue);
else
req = 0;
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 0;
}
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);
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.
*/
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);
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;
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 = cpu_to_le16 (1);
else
status = 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);
goto next_endpoints;
}
break;
case USB_REQ_CLEAR_FEATURE: {
struct net2280_ep *e;
if (u.r.bRequestType != USB_RECIP_ENDPOINT)
goto delegate;
if (u.r.wIndex != 0 /* HALT feature */
|| u.r.wLength != 0)
goto do_stall;
if ((e = get_ep_by_addr (dev, u.r.wIndex)) == 0)
goto do_stall;
clear_halt (e);
}
break;
case USB_REQ_SET_FEATURE: {
struct net2280_ep *e;
if (u.r.bRequestType != USB_RECIP_ENDPOINT)
goto delegate;
if (u.r.wIndex != 0 /* HALT feature */
|| u.r.wLength != 0)
goto do_stall;
if ((e = get_ep_by_addr (dev, u.r.wIndex)) == 0)
goto do_stall;
set_halt (e);
}
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;
/* when there's no data, queueing a response is optional */
} else if (list_empty (&ep->queue)) {
if (u.r.wLength == 0) {
/* done() not possible/requested */
allow_status (ep);
} else {
DEBUG (dev, "req %02x.%02x v%04x "
"gadget error, len %d, stat %d\n",
u.r.bRequestType, u.r.bRequest,
le16_to_cpu (u.r.wValue),
u.r.wLength, tmp);
dev->protocol_stall = 1;
}
}
/* some in/out token irq should follow; maybe stall then. */
}
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, scratch;
/* after disconnect there's nothing else to do! */
tmp = (1 << VBUS_INTERRUPT) | (1 << ROOT_PORT_RESET_INTERRUPT);
if (stat & tmp) {
writel (tmp, &dev->regs->irqstat1);
if (((stat & (1 << ROOT_PORT_RESET_INTERRUPT)) != 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: we don't actually suspend the hardware; that starts to
* interact with PCI power management, and needs something like a
* controller->suspend() call to clear SUSPEND_REQUEST_INTERRUPT.
* we shouldn't see resume interrupts.
* for rev 0100, this also avoids erratum 0102.
*/
tmp = (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT);
if (stat & tmp) {
if (dev->driver->suspend)
dev->driver->suspend (&dev->gadget);
stat &= ~tmp;
}
stat &= ~(1 << SUSPEND_REQUEST_INTERRUPT);
/* clear any other status/irqs */
if (stat)
writel (stat, &dev->regs->irqstat1);
/* some status we can just ignore */
stat &= ~((1 << CONTROL_STATUS_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 *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);
#ifdef USE_DMA_CHAINING
/* chaining should stop only on error (which?)
* or (stat0 codepath) short OUT transfer.
*/
#else
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);
#endif
/* 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)) {
#ifdef USE_DMA_CHAINING
stop_dma (ep->dma);
#endif
} else {
tmp = readl (&dma->dmactl);
if ((tmp & (1 << DMA_SCATTER_GATHER_ENABLE)) == 0
|| (tmp & (1 << DMA_ENABLE)) == 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;
}
/*-------------------------------------------------------------------------*/
/* 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_remove_file (&pdev->dev, &dev_attr_registers);
pci_set_drvdata (pdev, 0);
INFO (dev, "unbind from pci %s\n", pdev->slot_name);
kfree (dev);
the_controller = 0;
}
/* 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 *base = 0;
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) {
WARN (the_controller, "ignoring %s\n", pdev->slot_name);
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;
#ifdef HAVE_DRIVER_MODEL
strcpy (dev->gadget.dev.bus_id, pdev->slot_name);
strcpy (dev->gadget.dev.name, pdev->dev.name);
dev->gadget.dev.parent = &pdev->dev;
dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
#else
dev->gadget.dev.bus_id = pdev->slot_name;
#endif
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 *) base;
dev->usb = (struct net2280_usb_regs *) (base + 0x0080);
dev->pci = (struct net2280_pci_regs *) (base + 0x0100);
dev->dma = (struct net2280_dma_regs *) (base + 0x0180);
dev->dep = (struct net2280_dep_regs *) (base + 0x0200);
dev->epregs = (struct net2280_ep_regs *) (base + 0x0300);
/* put into initial config, link up all endpoints */
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__
snprintf (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 */
dev->requests = pci_pool_create ("requests", pdev,
sizeof (struct net2280_dma),
0 /* no alignment requirements */,
0 /* or page-crossing issues */);
if (!dev->requests) {
DEBUG (dev, "can't get request pool\n");
retval = -ENOMEM;
goto done;
}
for (i = 1; i < 5; i++) {
struct net2280_dma *td;
td = pci_pool_alloc (dev->requests, GFP_KERNEL,
&dev->ep [i].td_dma);
if (!td) {
DEBUG (dev, "can't get dummy %d\n", i);
retval = -ENOMEM;
goto done;
}
td->dmacount = 0; /* not VALID */
td->dmaaddr = cpu_to_le32 (DMA_ADDR_INVALID);
dev->ep [i].dummy = td;
}
/* enable lower-overhead pci memory bursts during DMA */
writel ((1 << PCI_RETRY_ABORT_ENABLE)
| (1 << DMA_MEMORY_WRITE_AND_INVALIDATE_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);
#ifdef HAVE_PCI_SET_MWI
pci_set_mwi (pdev);
#endif
/* ... 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);
bufp = DRIVER_VERSION
#ifndef USE_DMA_CHAINING
" (no dma chain)"
#endif
#ifdef NET2280_DMA_OUT_WORKAROUND
" (no dma out)"
#endif
;
INFO (dev, "version: %s\n", bufp);
the_controller = dev;
device_create_file (&pdev->dev, &dev_attr_registers);
return 0;
done:
if (dev)
net2280_remove (pdev);
return retval;
}
/*-------------------------------------------------------------------------*/
static const struct pci_device_id __devinitdata 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)
{
return pci_module_init (&net2280_pci_driver);
}
module_init (init);
static void __exit cleanup (void)
{
pci_unregister_driver (&net2280_pci_driver);
}
module_exit (cleanup);
drivers/usb/gadget/net2280.h 0 → 100644
View file @ 4ff981ae
/*
* NetChip 2280 high/full speed USB device controller.
* Unlike many such controllers, this one talks PCI.
*/
/*
* Copyright (C) 2002 NetChip Technology, Inc. (http://www.netchip.com)
* Copyright (C) 2003 David Brownell
*
* 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
*/
/*-------------------------------------------------------------------------*/
/* NET2280 MEMORY MAPPED REGISTERS
*
* The register layout came from the chip documentation, and the bit
* number definitions were extracted from chip specification.
*
* Use the shift operator ('<<') to build bit masks, with readl/writel
* to access the registers through PCI.
*/
/* main registers, BAR0 + 0x0000 */
struct net2280_regs {
// offset 0x0000
u32 devinit;
#define LOCAL_CLOCK_FREQUENCY 8
#define FORCE_PCI_RESET 7
#define PCI_ID 6
#define PCI_ENABLE 5
#define FIFO_SOFT_RESET 4
#define CFG_SOFT_RESET 3
#define PCI_SOFT_RESET 2
#define USB_SOFT_RESET 1
#define M8051_RESET 0
u32 eectl;
#define EEPROM_ADDRESS_WIDTH 23
#define EEPROM_CHIP_SELECT_ACTIVE 22
#define EEPROM_PRESENT 21
#define EEPROM_VALID 20
#define EEPROM_BUSY 19
#define EEPROM_CHIP_SELECT_ENABLE 18
#define EEPROM_BYTE_READ_START 17
#define EEPROM_BYTE_WRITE_START 16
#define EEPROM_READ_DATA 8
#define EEPROM_WRITE_DATA 0
u32 eeclkfreq;
u32 _unused0;
// offset 0x0010
u32 pciirqenb0; /* interrupt PCI master ... */
#define SETUP_PACKET_INTERRUPT_ENABLE 7
#define ENDPOINT_F_INTERRUPT_ENABLE 6
#define ENDPOINT_E_INTERRUPT_ENABLE 5
#define ENDPOINT_D_INTERRUPT_ENABLE 4
#define ENDPOINT_C_INTERRUPT_ENABLE 3
#define ENDPOINT_B_INTERRUPT_ENABLE 2
#define ENDPOINT_A_INTERRUPT_ENABLE 1
#define ENDPOINT_0_INTERRUPT_ENABLE 0
u32 pciirqenb1;
#define PCI_INTERRUPT_ENABLE 31
#define POWER_STATE_CHANGE_INTERRUPT_ENABLE 27
#define PCI_ARBITER_TIMEOUT_INTERRUPT_ENABLE 26
#define PCI_PARITY_ERROR_INTERRUPT_ENABLE 25
#define PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE 20
#define PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE 19
#define PCI_TARGET_ABORT_ASSERTED_INTERRUPT_ENABLE 18
#define PCI_RETRY_ABORT_INTERRUPT_ENABLE 17
#define PCI_MASTER_CYCLE_DONE_INTERRUPT_ENABLE 16
#define GPIO_INTERRUPT_ENABLE 13
#define DMA_D_INTERRUPT_ENABLE 12
#define DMA_C_INTERRUPT_ENABLE 11
#define DMA_B_INTERRUPT_ENABLE 10
#define DMA_A_INTERRUPT_ENABLE 9
#define EEPROM_DONE_INTERRUPT_ENABLE 8
#define VBUS_INTERRUPT_ENABLE 7
#define CONTROL_STATUS_INTERRUPT_ENABLE 6
#define ROOT_PORT_RESET_INTERRUPT_ENABLE 4
#define SUSPEND_REQUEST_INTERRUPT_ENABLE 3
#define SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE 2
#define RESUME_INTERRUPT_ENABLE 1
#define SOF_INTERRUPT_ENABLE 0
u32 cpu_irqenb0; /* ... or onboard 8051 */
#define SETUP_PACKET_INTERRUPT_ENABLE 7
#define ENDPOINT_F_INTERRUPT_ENABLE 6
#define ENDPOINT_E_INTERRUPT_ENABLE 5
#define ENDPOINT_D_INTERRUPT_ENABLE 4
#define ENDPOINT_C_INTERRUPT_ENABLE 3
#define ENDPOINT_B_INTERRUPT_ENABLE 2
#define ENDPOINT_A_INTERRUPT_ENABLE 1
#define ENDPOINT_0_INTERRUPT_ENABLE 0
u32 cpu_irqenb1;
#define CPU_INTERRUPT_ENABLE 31
#define POWER_STATE_CHANGE_INTERRUPT_ENABLE 27
#define PCI_ARBITER_TIMEOUT_INTERRUPT_ENABLE 26
#define PCI_PARITY_ERROR_INTERRUPT_ENABLE 25
#define PCI_INTA_INTERRUPT_ENABLE 24
#define PCI_PME_INTERRUPT_ENABLE 23
#define PCI_SERR_INTERRUPT_ENABLE 22
#define PCI_PERR_INTERRUPT_ENABLE 21
#define PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE 20
#define PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE 19
#define PCI_RETRY_ABORT_INTERRUPT_ENABLE 17
#define PCI_MASTER_CYCLE_DONE_INTERRUPT_ENABLE 16
#define GPIO_INTERRUPT_ENABLE 13
#define DMA_D_INTERRUPT_ENABLE 12
#define DMA_C_INTERRUPT_ENABLE 11
#define DMA_B_INTERRUPT_ENABLE 10
#define DMA_A_INTERRUPT_ENABLE 9
#define EEPROM_DONE_INTERRUPT_ENABLE 8
#define VBUS_INTERRUPT_ENABLE 7
#define CONTROL_STATUS_INTERRUPT_ENABLE 6
#define ROOT_PORT_RESET_INTERRUPT_ENABLE 4
#define SUSPEND_REQUEST_INTERRUPT_ENABLE 3
#define SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE 2
#define RESUME_INTERRUPT_ENABLE 1
#define SOF_INTERRUPT_ENABLE 0
// offset 0x0020
u32 _unused1;
u32 usbirqenb1;
#define USB_INTERRUPT_ENABLE 31
#define POWER_STATE_CHANGE_INTERRUPT_ENABLE 27
#define PCI_ARBITER_TIMEOUT_INTERRUPT_ENABLE 26
#define PCI_PARITY_ERROR_INTERRUPT_ENABLE 25
#define PCI_INTA_INTERRUPT_ENABLE 24
#define PCI_PME_INTERRUPT_ENABLE 23
#define PCI_SERR_INTERRUPT_ENABLE 22
#define PCI_PERR_INTERRUPT_ENABLE 21
#define PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE 20
#define PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE 19
#define PCI_RETRY_ABORT_INTERRUPT_ENABLE 17
#define PCI_MASTER_CYCLE_DONE_INTERRUPT_ENABLE 16
#define GPIO_INTERRUPT_ENABLE 13
#define DMA_D_INTERRUPT_ENABLE 12
#define DMA_C_INTERRUPT_ENABLE 11
#define DMA_B_INTERRUPT_ENABLE 10
#define DMA_A_INTERRUPT_ENABLE 9
#define EEPROM_DONE_INTERRUPT_ENABLE 8
#define VBUS_INTERRUPT_ENABLE 7
#define CONTROL_STATUS_INTERRUPT_ENABLE 6
#define ROOT_PORT_RESET_INTERRUPT_ENABLE 4
#define SUSPEND_REQUEST_INTERRUPT_ENABLE 3
#define SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE 2
#define RESUME_INTERRUPT_ENABLE 1
#define SOF_INTERRUPT_ENABLE 0
u32 irqstat0;
#define INTA_ASSERTED 12
#define SETUP_PACKET_INTERRUPT 7
#define ENDPOINT_F_INTERRUPT 6
#define ENDPOINT_E_INTERRUPT 5
#define ENDPOINT_D_INTERRUPT 4
#define ENDPOINT_C_INTERRUPT 3
#define ENDPOINT_B_INTERRUPT 2
#define ENDPOINT_A_INTERRUPT 1
#define ENDPOINT_0_INTERRUPT 0
u32 irqstat1;
#define POWER_STATE_CHANGE_INTERRUPT 27
#define PCI_ARBITER_TIMEOUT_INTERRUPT 26
#define PCI_PARITY_ERROR_INTERRUPT 25
#define PCI_INTA_INTERRUPT 24
#define PCI_PME_INTERRUPT 23
#define PCI_SERR_INTERRUPT 22
#define PCI_PERR_INTERRUPT 21
#define PCI_MASTER_ABORT_RECEIVED_INTERRUPT 20
#define PCI_TARGET_ABORT_RECEIVED_INTERRUPT 19
#define PCI_RETRY_ABORT_INTERRUPT 17
#define PCI_MASTER_CYCLE_DONE_INTERRUPT 16
#define GPIO_INTERRUPT 13
#define DMA_D_INTERRUPT 12
#define DMA_C_INTERRUPT 11
#define DMA_B_INTERRUPT 10
#define DMA_A_INTERRUPT 9
#define EEPROM_DONE_INTERRUPT 8
#define VBUS_INTERRUPT 7
#define CONTROL_STATUS_INTERRUPT 6
#define ROOT_PORT_RESET_INTERRUPT 4
#define SUSPEND_REQUEST_INTERRUPT 3
#define SUSPEND_REQUEST_CHANGE_INTERRUPT 2
#define RESUME_INTERRUPT 1
#define SOF_INTERRUPT 0
// offset 0x0030
u32 idxaddr;
u32 idxdata;
u32 fifoctl;
#define PCI_BASE2_RANGE 16
#define IGNORE_FIFO_AVAILABILITY 3
#define PCI_BASE2_SELECT 2
#define FIFO_CONFIGURATION_SELECT 0
u32 _unused2;
// offset 0x0040
u32 memaddr;
#define START 28
#define DIRECTION 27
#define FIFO_DIAGNOSTIC_SELECT 24
#define MEMORY_ADDRESS 0
u32 memdata0;
u32 memdata1;
u32 _unused3;
// offset 0x0050
u32 gpioctl;
#define GPIO3_LED_SELECT 12
#define GPIO3_INTERRUPT_ENABLE 11
#define GPIO2_INTERRUPT_ENABLE 10
#define GPIO1_INTERRUPT_ENABLE 9
#define GPIO0_INTERRUPT_ENABLE 8
#define GPIO3_OUTPUT_ENABLE 7
#define GPIO2_OUTPUT_ENABLE 6
#define GPIO1_OUTPUT_ENABLE 5
#define GPIO0_OUTPUT_ENABLE 4
#define GPIO3_DATA 3
#define GPIO2_DATA 2
#define GPIO1_DATA 1
#define GPIO0_DATA 0
u32 gpiostat;
#define GPIO3_INTERRUPT 3
#define GPIO2_INTERRUPT 2
#define GPIO1_INTERRUPT 1
#define GPIO0_INTERRUPT 0
} __attribute__ ((packed));
/* usb control, BAR0 + 0x0080 */
struct net2280_usb_regs {
// offset 0x0080
u32 stdrsp;
#define STALL_UNSUPPORTED_REQUESTS 31
#define SET_TEST_MODE 16
#define GET_OTHER_SPEED_CONFIGURATION 15
#define GET_DEVICE_QUALIFIER 14
#define SET_ADDRESS 13
#define ENDPOINT_SET_CLEAR_HALT 12
#define DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP 11
#define GET_STRING_DESCRIPTOR_2 10
#define GET_STRING_DESCRIPTOR_1 9
#define GET_STRING_DESCRIPTOR_0 8
#define GET_SET_INTERFACE 6
#define GET_SET_CONFIGURATION 5
#define GET_CONFIGURATION_DESCRIPTOR 4
#define GET_DEVICE_DESCRIPTOR 3
#define GET_ENDPOINT_STATUS 2
#define GET_INTERFACE_STATUS 1
#define GET_DEVICE_STATUS 0
u32 prodvendid;
#define PRODUCT_ID 16
#define VENDOR_ID 0
u32 relnum;
u32 usbctl;
#define SERIAL_NUMBER_INDEX 16
#define PRODUCT_ID_STRING_ENABLE 13
#define VENDOR_ID_STRING_ENABLE 12
#define USB_ROOT_PORT_WAKEUP_ENABLE 11
#define VBUS_PIN 10
#define TIMED_DISCONNECT 9
#define SUSPEND_IMMEDIATELY 7
#define SELF_POWERED_USB_DEVICE 6
#define REMOTE_WAKEUP_SUPPORT 5
#define PME_POLARITY 4
#define USB_DETECT_ENABLE 3
#define PME_WAKEUP_ENABLE 2
#define DEVICE_REMOTE_WAKEUP_ENABLE 1
#define SELF_POWERED_STATUS 0
// offset 0x0090
u32 usbstat;
#define HIGH_SPEED 7
#define FULL_SPEED 6
#define GENERATE_RESUME 5
#define GENERATE_DEVICE_REMOTE_WAKEUP 4
u32 xcvrdiag;
#define FORCE_HIGH_SPEED_MODE 31
#define FORCE_FULL_SPEED_MODE 30
#define USB_TEST_MODE 24
#define LINE_STATE 16
#define TRANSCEIVER_OPERATION_MODE 2
#define TRANSCEIVER_SELECT 1
#define TERMINATION_SELECT 0
u32 setup0123;
u32 setup4567;
// offset 0x0090
u32 _unused0;
u32 ouraddr;
#define FORCE_IMMEDIATE 7
#define OUR_USB_ADDRESS 0
u32 ourconfig;
} __attribute__ ((packed));
/* pci control, BAR0 + 0x0100 */
struct net2280_pci_regs {
// offset 0x0100
u32 pcimstctl;
#define PCI_ARBITER_PARK_SELECT 13
#define PCI_MULTI LEVEL_ARBITER 12
#define PCI_RETRY_ABORT_ENABLE 11
#define DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE 10
#define DMA_READ_MULTIPLE_ENABLE 9
#define DMA_READ_LINE_ENABLE 8
#define PCI_MASTER_COMMAND_SELECT 6
#define MEM_READ_OR_WRITE 0
#define IO_READ_OR_WRITE 1
#define CFG_READ_OR_WRITE 2
#define PCI_MASTER_START 5
#define PCI_MASTER_READ_WRITE 4
#define PCI_MASTER_WRITE 0
#define PCI_MASTER_READ 1
#define PCI_MASTER_BYTE_WRITE_ENABLES 0
u32 pcimstaddr;
u32 pcimstdata;
u32 pcimststat;
#define PCI_ARBITER_CLEAR 2
#define PCI_EXTERNAL_ARBITER 1
#define PCI_HOST_MODE 0
} __attribute__ ((packed));
/* dma control, BAR0 + 0x0180 ... array of four structs like this,
* for channels 0..3. see also struct net2280_dma: descriptor
* that can be loaded into some of these registers.
*/
struct net2280_dma_regs { /* [11.7] */
// offset 0x0180, 0x01a0, 0x01c0, 0x01e0,
u32 dmactl;
#define DMA_SCATTER_GATHER_DONE_INTERRUPT_ENABLE 25
#define DMA_CLEAR_COUNT_ENABLE 21
#define DESCRIPTOR_POLLING_RATE 19
#define POLL_CONTINUOUS 0
#define POLL_1_USEC 1
#define POLL_100_USEC 2
#define POLL_1_MSEC 3
#define DMA_VALID_BIT_POLLING_ENABLE 18
#define DMA_VALID_BIT_ENABLE 17
#define DMA_SCATTER_GATHER_ENABLE 16
#define DMA_OUT_AUTO_START_ENABLE 4
#define DMA_PREEMPT_ENABLE 3
#define DMA_FIFO_VALIDATE 2
#define DMA_ENABLE 1
#define DMA_ADDRESS_HOLD 0
u32 dmastat;
#define DMA_SCATTER_GATHER_DONE_INTERRUPT 25
#define DMA_TRANSACTION_DONE_INTERRUPT 24
#define DMA_ABORT 1
#define DMA_START 0
u32 _unused0 [2];
// offset 0x0190, 0x01b0, 0x01d0, 0x01f0,
u32 dmacount;
#define VALID_BIT 31
#define DMA_DIRECTION 30
#define DMA_DONE_INTERRUPT_ENABLE 29
#define END_OF_CHAIN 28
#define DMA_BYTE_COUNT_MASK ((1<<24)-1)
#define DMA_BYTE_COUNT 0
u32 dmaaddr;
u32 dmadesc;
u32 _unused1;
} __attribute__ ((packed));
/* dedicated endpoint registers, BAR0 + 0x0200 */
struct net2280_dep_regs { /* [11.8] */
// offset 0x0200, 0x0210, 0x220, 0x230, 0x240
u32 dep_cfg;
// offset 0x0204, 0x0214, 0x224, 0x234, 0x244
u32 dep_rsp;
u32 _unused [2];
} __attribute__ ((packed));
/* configurable endpoint registers, BAR0 + 0x0300 ... array of seven structs
* like this, for ep0 then the configurable endpoints A..F
* ep0 reserved for control; E and F have only 64 bytes of fifo
*/
struct net2280_ep_regs { /* [11.9] */
// offset 0x0300, 0x0320, 0x0340, 0x0360, 0x0380, 0x03a0, 0x03c0
u32 ep_cfg;
#define ENDPOINT_BYTE_COUNT 16
#define ENDPOINT_ENABLE 10
#define ENDPOINT_TYPE 8
#define ENDPOINT_DIRECTION 7
#define ENDPOINT_NUMBER 0
u32 ep_rsp;
#define SET_NAK_OUT_PACKETS 15
#define SET_EP_HIDE_STATUS_PHASE 14
#define SET_INTERRUPT_MODE 12
#define SET_CONTROL_STATUS_PHASE_HANDSHAKE 11
#define SET_NAK_OUT_PACKETS_MODE 10
#define SET_ENDPOINT_TOGGLE 9
#define SET_ENDPOINT_HALT 8
#define CLEAR_NAK_OUT_PACKETS 7
#define CLEAR_EP_HIDE_STATUS_PHASE 6
#define CLEAR_INTERRUPT_MODE 4
#define CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE 3
#define CLEAR_NAK_OUT_PACKETS_MODE 2
#define CLEAR_ENDPOINT_TOGGLE 1
#define CLEAR_ENDPOINT_HALT 0
u32 ep_irqenb;
#define SHORT_PACKET_OUT_DONE_INTERRUPT_ENABLE 6
#define SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE 5
#define DATA_PACKET_RECEIVED_INTERRUPT_ENABLE 3
#define DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE 2
#define DATA_OUT_PING_TOKEN_INTERRUPT_ENABLE 1
#define DATA_IN_TOKEN_INTERRUPT_ENABLE 0
u32 ep_stat;
#define FIFO_VALID_COUNT 24
#define HIGH_BANDWIDTH_OUT_TRANSACTION_PID 22
#define TIMEOUT 21
#define USB_STALL_SENT 20
#define USB_IN_NAK_SENT 19
#define USB_IN_ACK_RCVD 18
#define USB_OUT_PING_NAK_SENT 17
#define USB_OUT_ACK_SENT 16
#define FIFO_OVERFLOW 13
#define FIFO_UNDERFLOW 12
#define FIFO_FULL 11
#define FIFO_EMPTY 10
#define FIFO_FLUSH 9
#define SHORT_PACKET_OUT_DONE_INTERRUPT 6
#define SHORT_PACKET_TRANSFERRED_INTERRUPT 5
#define NAK_OUT_PACKETS 4
#define DATA_PACKET_RECEIVED_INTERRUPT 3
#define DATA_PACKET_TRANSMITTED_INTERRUPT 2
#define DATA_OUT_PING_TOKEN_INTERRUPT 1
#define DATA_IN_TOKEN_INTERRUPT 0
// offset 0x0310, 0x0330, 0x0350, 0x0370, 0x0390, 0x03b0, 0x03d0
u32 ep_avail;
u32 ep_data;
u32 _unused0 [2];
} __attribute__ ((packed));
/*-------------------------------------------------------------------------*/
/* indexed registers [11.10] are accessed indirectly
* caller must own the device lock.
*/
static inline u32
get_idx_reg (struct net2280_regs *regs, u32 index)
{
writel (index, &regs->idxaddr);
/* NOTE: synchs device/cpu memory views */
return readl (&regs->idxdata);
}
static inline void
set_idx_reg (struct net2280_regs *regs, u32 index, u32 value)
{
writel (index, &regs->idxaddr);
writel (value, &regs->idxdata);
/* posted, may not be visible yet */
}
#define REG_DIAG 0x0
#define RETRY_COUNTER 16
#define FORCE_PCI_SERR 11
#define FORCE_PCI_INTERRUPT 10
#define FORCE_USB_INTERRUPT 9
#define FORCE_CPU_INTERRUPT 8
#define ILLEGAL_BYTE_ENABLES 5
#define FAST_TIMES 4
#define FORCE_RECEIVE_ERROR 2
#define FORCE_TRANSMIT_CRC_ERROR 0
#define REG_FRAME 0x02 /* from last sof */
#define REG_CHIPREV 0x03 /* in bcd */
#define REG_HS_NAK_RATE 0x0a /* NAK per N uframes */
/* ep a-f highspeed and fullspeed maxpacket, addresses
* computed from ep->num
*/
#define REG_EP_MAXPKT(dev,num) (((num) + 1) * 0x10 + \
(((dev)->gadget.speed == USB_SPEED_HIGH) ? 0 : 1))
/*-------------------------------------------------------------------------*/
/* [8.3] for scatter/gather i/o
* use struct net2280_dma_regs bitfields
*/
struct net2280_dma {
u32 dmacount;
u32 dmaaddr; /* the buffer */
u32 dmadesc; /* next dma descriptor */
u32 _reserved;
} __attribute__ ((aligned (16)));
/*-------------------------------------------------------------------------*/
/* DRIVER DATA STRUCTURES and UTILITIES */
struct net2280_ep {
struct usb_ep ep;
struct net2280_ep_regs *regs;
struct net2280_dma_regs *dma;
struct net2280_dma *dummy;
dma_addr_t td_dma; /* of dummy */
struct net2280 *dev;
unsigned long irqs;
/* analogous to a host-side qh */
struct list_head queue;
const struct usb_endpoint_descriptor *desc;
unsigned num : 8,
fifo_size : 12,
in_fifo_validate : 1,
stopped : 1,
is_in : 1,
is_iso : 1;
};
static inline void allow_status (struct net2280_ep *ep)
{
/* ep0 only */
writel ( (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)
| (1 << CLEAR_NAK_OUT_PACKETS_MODE)
, &ep->regs->ep_rsp);
}
static inline void set_halt (struct net2280_ep *ep)
{
/* ep0 and bulk/intr endpoints */
writel ( (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)
/* set NAK_OUT for erratum 0114 */
| (1 << SET_NAK_OUT_PACKETS)
| (1 << SET_ENDPOINT_HALT)
, &ep->regs->ep_rsp);
}
static inline void clear_halt (struct net2280_ep *ep)
{
/* bulk/intr endpoints */
writel ( (1 << CLEAR_ENDPOINT_HALT)
| (1 << CLEAR_ENDPOINT_TOGGLE)
, &ep->regs->ep_rsp);
}
/* count (<= 4) bytes in the next fifo write will be valid */
static inline void set_fifo_bytecount (struct net2280_ep *ep, unsigned count)
{
writeb (count, 2 + (u8 *) &ep->regs->ep_cfg);
}
struct net2280_request {
struct usb_request req;
struct net2280_dma *td;
dma_addr_t td_dma;
struct list_head queue;
unsigned mapped : 1,
dma_done : 1,
valid : 1;
};
struct net2280 {
/* each pci device provides one gadget, several endpoints */
struct usb_gadget gadget;
spinlock_t lock;
struct net2280_ep ep [7];
struct usb_gadget_driver *driver;
unsigned enabled : 1,
protocol_stall : 1,
got_irq : 1,
region : 1,
selfpowered : 1;
u16 chiprev;
/* pci state used to access those endpoints */
struct pci_dev *pdev;
struct net2280_regs *regs;
struct net2280_usb_regs *usb;
struct net2280_pci_regs *pci;
struct net2280_dma_regs *dma;
struct net2280_dep_regs *dep;
struct net2280_ep_regs *epregs;
struct pci_pool *requests;
// statistics...
};
#ifdef USE_RDK_LEDS
static inline void net2280_led_init (struct net2280 *dev)
{
/* LED3 (green) is on during USB activity. note erratum 0113. */
writel ((1 << GPIO3_LED_SELECT)
| (1 << GPIO3_OUTPUT_ENABLE)
| (1 << GPIO2_OUTPUT_ENABLE)
| (1 << GPIO1_OUTPUT_ENABLE)
| (1 << GPIO0_OUTPUT_ENABLE)
, &dev->regs->gpioctl);
}
/* indicate speed with bi-color LED 0/1 */
static inline
void net2280_led_speed (struct net2280 *dev, enum usb_device_speed speed)
{
u32 val = readl (&dev->regs->gpioctl);
switch (speed) {
case USB_SPEED_HIGH: /* green */
val &= ~(1 << GPIO0_DATA);
val |= (1 << GPIO1_DATA);
break;
case USB_SPEED_FULL: /* red */
val &= ~(1 << GPIO1_DATA);
val |= (1 << GPIO0_DATA);
break;
default: /* (off/black) */
val &= ~((1 << GPIO1_DATA) | (1 << GPIO0_DATA));
break;
}
writel (val, &dev->regs->gpioctl);
}
/* indicate power with LED 2 */
static inline void net2280_led_active (struct net2280 *dev, int is_active)
{
u32 val = readl (&dev->regs->gpioctl);
// FIXME this LED never seems to turn on.
if (is_active)
val |= GPIO2_DATA;
else
val &= ~GPIO2_DATA;
writel (val, &dev->regs->gpioctl);
}
static inline void net2280_led_shutdown (struct net2280 *dev)
{
/* turn off all four GPIO*_DATA bits */
writel (readl (&dev->regs->gpioctl) & ~0x0f,
&dev->regs->gpioctl);
}
#else
#define net2280_led_init(dev) do { } while (0)
#define net2280_led_speed(dev, speed) do { } while (0)
#define net2280_led_shutdown(dev) do { } while (0)
#endif
/*-------------------------------------------------------------------------*/
#define xprintk(dev,level,fmt,args...) \
printk(level "%s %s: " fmt , driver_name , \
dev->pdev->slot_name , ## args)
#ifdef DEBUG
#undef DEBUG
#define DEBUG(dev,fmt,args...) \
xprintk(dev , KERN_DEBUG , fmt , ## args)
#else
#define DEBUG(dev,fmt,args...) \
do { } while (0)
#endif /* DEBUG */
#ifdef VERBOSE
#define VDEBUG DEBUG
#else
#define VDEBUG(dev,fmt,args...) \
do { } while (0)
#endif /* VERBOSE */
#define ERROR(dev,fmt,args...) \
xprintk(dev , KERN_ERR , fmt , ## args)
#define WARN(dev,fmt,args...) \
xprintk(dev , KERN_WARNING , fmt , ## args)
#define INFO(dev,fmt,args...) \
xprintk(dev , KERN_INFO , fmt , ## args)
/*-------------------------------------------------------------------------*/
static inline void start_out_naking (struct net2280_ep *ep)
{
/* NOTE: hardware races lurk here, and PING protocol issues */
writel ((1 << SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
/* synch with device */
readl (&ep->regs->ep_rsp);
}
#ifdef DEBUG
static inline void assert_out_naking (struct net2280_ep *ep, const char *where)
{
u32 tmp = readl (&ep->regs->ep_stat);
if ((tmp & (1 << NAK_OUT_PACKETS)) == 0) {
DEBUG (ep->dev, "%s %s %08x !NAK\n",
ep->ep.name, where, tmp);
writel ((1 << SET_NAK_OUT_PACKETS),
&ep->regs->ep_rsp);
}
}
#define ASSERT_OUT_NAKING(ep) assert_out_naking(ep,__FUNCTION__)
#else
#define ASSERT_OUT_NAKING(ep) do {} while (0)
#endif
static inline void stop_out_naking (struct net2280_ep *ep)
{
u32 tmp;
tmp = readl (&ep->regs->ep_stat);
if ((tmp & (1 << NAK_OUT_PACKETS)) != 0)
writel ((1 << CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
}
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