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linux_dsm_epyc7002/drivers/usb/gadget/omap_udc.c
Linus Torvalds 268bb0ce3e sanitize <linux/prefetch.h> usage 
Commit e66eed651f ("list: remove prefetching from regular list
iterators") removed the include of prefetch.h from list.h, which
uncovered several cases that had apparently relied on that rather
obscure header file dependency.

So this fixes things up a bit, using

   grep -L linux/prefetch.h $(git grep -l '[^a-z_]prefetchw*(' -- '*.[ch]')
   grep -L 'prefetchw*(' $(git grep -l 'linux/prefetch.h' -- '*.[ch]')

to guide us in finding files that either need <linux/prefetch.h>
inclusion, or have it despite not needing it.

There are more of them around (mostly network drivers), but this gets
many core ones.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-05-20 12:50:29 -07:00

3143 lines
80 KiB
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/*
* omap_udc.c -- for OMAP full speed udc; most chips support OTG.
*
* Copyright (C) 2004 Texas Instruments, Inc.
* Copyright (C) 2004-2005 David Brownell
*
* OMAP2 & DMA support by Kyungmin Park <kyungmin.park@samsung.com>
*
* 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
#undef VERBOSE
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/mm.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/otg.h>
#include <linux/dma-mapping.h>
#include <linux/clk.h>
#include <linux/prefetch.h>
#include <asm/byteorder.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/unaligned.h>
#include <asm/mach-types.h>
#include <plat/dma.h>
#include <plat/usb.h>
#include "omap_udc.h"
#undef USB_TRACE
/* bulk DMA seems to be behaving for both IN and OUT */
#define USE_DMA
/* ISO too */
#define USE_ISO
#define DRIVER_DESC "OMAP UDC driver"
#define DRIVER_VERSION "4 October 2004"
#define DMA_ADDR_INVALID (~(dma_addr_t)0)
#define OMAP2_DMA_CH(ch) (((ch) - 1) << 1)
#define OMAP24XX_DMA(name, ch) (OMAP24XX_DMA_##name + OMAP2_DMA_CH(ch))
/*
* The OMAP UDC needs _very_ early endpoint setup: before enabling the
* D+ pullup to allow enumeration. That's too early for the gadget
* framework to use from usb_endpoint_enable(), which happens after
* enumeration as part of activating an interface. (But if we add an
* optional new "UDC not yet running" state to the gadget driver model,
* even just during driver binding, the endpoint autoconfig logic is the
* natural spot to manufacture new endpoints.)
*
* So instead of using endpoint enable calls to control the hardware setup,
* this driver defines a "fifo mode" parameter. It's used during driver
* initialization to choose among a set of pre-defined endpoint configs.
* See omap_udc_setup() for available modes, or to add others. That code
* lives in an init section, so use this driver as a module if you need
* to change the fifo mode after the kernel boots.
*
* Gadget drivers normally ignore endpoints they don't care about, and
* won't include them in configuration descriptors. That means only
* misbehaving hosts would even notice they exist.
*/
#ifdef USE_ISO
static unsigned fifo_mode = 3;
#else
static unsigned fifo_mode = 0;
#endif
/* "modprobe omap_udc fifo_mode=42", or else as a kernel
* boot parameter "omap_udc:fifo_mode=42"
*/
module_param (fifo_mode, uint, 0);
MODULE_PARM_DESC (fifo_mode, "endpoint configuration");
#ifdef USE_DMA
static unsigned use_dma = 1;
/* "modprobe omap_udc use_dma=y", or else as a kernel
* boot parameter "omap_udc:use_dma=y"
*/
module_param (use_dma, bool, 0);
MODULE_PARM_DESC (use_dma, "enable/disable DMA");
#else /* !USE_DMA */
/* save a bit of code */
#define use_dma 0
#endif /* !USE_DMA */
static const char driver_name [] = "omap_udc";
static const char driver_desc [] = DRIVER_DESC;
/*-------------------------------------------------------------------------*/
/* there's a notion of "current endpoint" for modifying endpoint
* state, and PIO access to its FIFO.
*/
static void use_ep(struct omap_ep *ep, u16 select)
{
u16 num = ep->bEndpointAddress & 0x0f;
if (ep->bEndpointAddress & USB_DIR_IN)
num |= UDC_EP_DIR;
omap_writew(num | select, UDC_EP_NUM);
/* when select, MUST deselect later !! */
}
static inline void deselect_ep(void)
{
u16 w;
w = omap_readw(UDC_EP_NUM);
w &= ~UDC_EP_SEL;
omap_writew(w, UDC_EP_NUM);
/* 6 wait states before TX will happen */
}
static void dma_channel_claim(struct omap_ep *ep, unsigned preferred);
/*-------------------------------------------------------------------------*/
static int omap_ep_enable(struct usb_ep *_ep,
const struct usb_endpoint_descriptor *desc)
{
struct omap_ep *ep = container_of(_ep, struct omap_ep, ep);
struct omap_udc *udc;
unsigned long flags;
u16 maxp;
/* catch various bogus parameters */
if (!_ep || !desc || ep->desc
|| desc->bDescriptorType != USB_DT_ENDPOINT
|| ep->bEndpointAddress != desc->bEndpointAddress
|| ep->maxpacket < le16_to_cpu
(desc->wMaxPacketSize)) {
DBG("%s, bad ep or descriptor\n", __func__);
return -EINVAL;
}
maxp = le16_to_cpu (desc->wMaxPacketSize);
if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
&& maxp != ep->maxpacket)
|| le16_to_cpu(desc->wMaxPacketSize) > ep->maxpacket
|| !desc->wMaxPacketSize) {
DBG("%s, bad %s maxpacket\n", __func__, _ep->name);
return -ERANGE;
}
#ifdef USE_ISO
if ((desc->bmAttributes == USB_ENDPOINT_XFER_ISOC
&& desc->bInterval != 1)) {
/* hardware wants period = 1; USB allows 2^(Interval-1) */
DBG("%s, unsupported ISO period %dms\n", _ep->name,
1 << (desc->bInterval - 1));
return -EDOM;
}
#else
if (desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
DBG("%s, ISO nyet\n", _ep->name);
return -EDOM;
}
#endif
/* xfer types must match, except that interrupt ~= bulk */
if (ep->bmAttributes != desc->bmAttributes
&& ep->bmAttributes != USB_ENDPOINT_XFER_BULK
&& desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
DBG("%s, %s type mismatch\n", __func__, _ep->name);
return -EINVAL;
}
udc = ep->udc;
if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
DBG("%s, bogus device state\n", __func__);
return -ESHUTDOWN;
}
spin_lock_irqsave(&udc->lock, flags);
ep->desc = desc;
ep->irqs = 0;
ep->stopped = 0;
ep->ep.maxpacket = maxp;
/* set endpoint to initial state */
ep->dma_channel = 0;
ep->has_dma = 0;
ep->lch = -1;
use_ep(ep, UDC_EP_SEL);
omap_writew(udc->clr_halt, UDC_CTRL);
ep->ackwait = 0;
deselect_ep();
if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
list_add(&ep->iso, &udc->iso);
/* maybe assign a DMA channel to this endpoint */
if (use_dma && desc->bmAttributes == USB_ENDPOINT_XFER_BULK)
/* FIXME ISO can dma, but prefers first channel */
dma_channel_claim(ep, 0);
/* PIO OUT may RX packets */
if (desc->bmAttributes != USB_ENDPOINT_XFER_ISOC
&& !ep->has_dma
&& !(ep->bEndpointAddress & USB_DIR_IN)) {
omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
ep->ackwait = 1 + ep->double_buf;
}
spin_unlock_irqrestore(&udc->lock, flags);
VDBG("%s enabled\n", _ep->name);
return 0;
}
static void nuke(struct omap_ep *, int status);
static int omap_ep_disable(struct usb_ep *_ep)
{
struct omap_ep *ep = container_of(_ep, struct omap_ep, ep);
unsigned long flags;
if (!_ep || !ep->desc) {
DBG("%s, %s not enabled\n", __func__,
_ep ? ep->ep.name : NULL);
return -EINVAL;
}
spin_lock_irqsave(&ep->udc->lock, flags);
ep->desc = NULL;
nuke (ep, -ESHUTDOWN);
ep->ep.maxpacket = ep->maxpacket;
ep->has_dma = 0;
omap_writew(UDC_SET_HALT, UDC_CTRL);
list_del_init(&ep->iso);
del_timer(&ep->timer);
spin_unlock_irqrestore(&ep->udc->lock, flags);
VDBG("%s disabled\n", _ep->name);
return 0;
}
/*-------------------------------------------------------------------------*/
static struct usb_request *
omap_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
{
struct omap_req *req;
req = kzalloc(sizeof(*req), gfp_flags);
if (req) {
req->req.dma = DMA_ADDR_INVALID;
INIT_LIST_HEAD (&req->queue);
}
return &req->req;
}
static void
omap_free_request(struct usb_ep *ep, struct usb_request *_req)
{
struct omap_req *req = container_of(_req, struct omap_req, req);
if (_req)
kfree (req);
}
/*-------------------------------------------------------------------------*/
static void
done(struct omap_ep *ep, struct omap_req *req, int status)
{
unsigned stopped = ep->stopped;
list_del_init(&req->queue);
if (req->req.status == -EINPROGRESS)
req->req.status = status;
else
status = req->req.status;
if (use_dma && ep->has_dma) {
if (req->mapped) {
dma_unmap_single(ep->udc->gadget.dev.parent,
req->req.dma, req->req.length,
(ep->bEndpointAddress & USB_DIR_IN)
? DMA_TO_DEVICE
: DMA_FROM_DEVICE);
req->req.dma = DMA_ADDR_INVALID;
req->mapped = 0;
} else
dma_sync_single_for_cpu(ep->udc->gadget.dev.parent,
req->req.dma, req->req.length,
(ep->bEndpointAddress & USB_DIR_IN)
? DMA_TO_DEVICE
: DMA_FROM_DEVICE);
}
#ifndef USB_TRACE
if (status && status != -ESHUTDOWN)
#endif
VDBG("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(&ep->udc->lock);
req->req.complete(&ep->ep, &req->req);
spin_lock(&ep->udc->lock);
ep->stopped = stopped;
}
/*-------------------------------------------------------------------------*/
#define UDC_FIFO_FULL (UDC_NON_ISO_FIFO_FULL | UDC_ISO_FIFO_FULL)
#define UDC_FIFO_UNWRITABLE (UDC_EP_HALTED | UDC_FIFO_FULL)
#define FIFO_EMPTY (UDC_NON_ISO_FIFO_EMPTY | UDC_ISO_FIFO_EMPTY)
#define FIFO_UNREADABLE (UDC_EP_HALTED | FIFO_EMPTY)
static inline int
write_packet(u8 *buf, struct omap_req *req, unsigned max)
{
unsigned len;
u16 *wp;
len = min(req->req.length - req->req.actual, max);
req->req.actual += len;
max = len;
if (likely((((int)buf) & 1) == 0)) {
wp = (u16 *)buf;
while (max >= 2) {
omap_writew(*wp++, UDC_DATA);
max -= 2;
}
buf = (u8 *)wp;
}
while (max--)
omap_writeb(*buf++, UDC_DATA);
return len;
}
// FIXME change r/w fifo calling convention
// return: 0 = still running, 1 = completed, negative = errno
static int write_fifo(struct omap_ep *ep, struct omap_req *req)
{
u8 *buf;
unsigned count;
int is_last;
u16 ep_stat;
buf = req->req.buf + req->req.actual;
prefetch(buf);
/* PIO-IN isn't double buffered except for iso */
ep_stat = omap_readw(UDC_STAT_FLG);
if (ep_stat & UDC_FIFO_UNWRITABLE)
return 0;
count = ep->ep.maxpacket;
count = write_packet(buf, req, count);
omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
ep->ackwait = 1;
/* last packet is often short (sometimes a zlp) */
if (count != ep->ep.maxpacket)
is_last = 1;
else if (req->req.length == req->req.actual
&& !req->req.zero)
is_last = 1;
else
is_last = 0;
/* NOTE: requests complete when all IN data is in a
* FIFO (or sometimes later, if a zlp was needed).
* Use usb_ep_fifo_status() where needed.
*/
if (is_last)
done(ep, req, 0);
return is_last;
}
static inline int
read_packet(u8 *buf, struct omap_req *req, unsigned avail)
{
unsigned len;
u16 *wp;
len = min(req->req.length - req->req.actual, avail);
req->req.actual += len;
avail = len;
if (likely((((int)buf) & 1) == 0)) {
wp = (u16 *)buf;
while (avail >= 2) {
*wp++ = omap_readw(UDC_DATA);
avail -= 2;
}
buf = (u8 *)wp;
}
while (avail--)
*buf++ = omap_readb(UDC_DATA);
return len;
}
// return: 0 = still running, 1 = queue empty, negative = errno
static int read_fifo(struct omap_ep *ep, struct omap_req *req)
{
u8 *buf;
unsigned count, avail;
int is_last;
buf = req->req.buf + req->req.actual;
prefetchw(buf);
for (;;) {
u16 ep_stat = omap_readw(UDC_STAT_FLG);
is_last = 0;
if (ep_stat & FIFO_EMPTY) {
if (!ep->double_buf)
break;
ep->fnf = 1;
}
if (ep_stat & UDC_EP_HALTED)
break;
if (ep_stat & UDC_FIFO_FULL)
avail = ep->ep.maxpacket;
else {
avail = omap_readw(UDC_RXFSTAT);
ep->fnf = ep->double_buf;
}
count = read_packet(buf, req, avail);
/* partial packet reads may not be errors */
if (count < ep->ep.maxpacket) {
is_last = 1;
/* overflowed this request? flush extra data */
if (count != avail) {
req->req.status = -EOVERFLOW;
avail -= count;
while (avail--)
omap_readw(UDC_DATA);
}
} else if (req->req.length == req->req.actual)
is_last = 1;
else
is_last = 0;
if (!ep->bEndpointAddress)
break;
if (is_last)
done(ep, req, 0);
break;
}
return is_last;
}
/*-------------------------------------------------------------------------*/
static u16 dma_src_len(struct omap_ep *ep, dma_addr_t start)
{
dma_addr_t end;
/* IN-DMA needs this on fault/cancel paths, so 15xx misreports
* the last transfer's bytecount by more than a FIFO's worth.
*/
if (cpu_is_omap15xx())
return 0;
end = omap_get_dma_src_pos(ep->lch);
if (end == ep->dma_counter)
return 0;
end |= start & (0xffff << 16);
if (end < start)
end += 0x10000;
return end - start;
}
static u16 dma_dest_len(struct omap_ep *ep, dma_addr_t start)
{
dma_addr_t end;
end = omap_get_dma_dst_pos(ep->lch);
if (end == ep->dma_counter)
return 0;
end |= start & (0xffff << 16);
if (cpu_is_omap15xx())
end++;
if (end < start)
end += 0x10000;
return end - start;
}
/* Each USB transfer request using DMA maps to one or more DMA transfers.
* When DMA completion isn't request completion, the UDC continues with
* the next DMA transfer for that USB transfer.
*/
static void next_in_dma(struct omap_ep *ep, struct omap_req *req)
{
u16 txdma_ctrl, w;
unsigned length = req->req.length - req->req.actual;
const int sync_mode = cpu_is_omap15xx()
? OMAP_DMA_SYNC_FRAME
: OMAP_DMA_SYNC_ELEMENT;
int dma_trigger = 0;
if (cpu_is_omap24xx())
dma_trigger = OMAP24XX_DMA(USB_W2FC_TX0, ep->dma_channel);
/* measure length in either bytes or packets */
if ((cpu_is_omap16xx() && length <= UDC_TXN_TSC)
|| (cpu_is_omap24xx() && length < ep->maxpacket)
|| (cpu_is_omap15xx() && length < ep->maxpacket)) {
txdma_ctrl = UDC_TXN_EOT | length;
omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S8,
length, 1, sync_mode, dma_trigger, 0);
} else {
length = min(length / ep->maxpacket,
(unsigned) UDC_TXN_TSC + 1);
txdma_ctrl = length;
omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S16,
ep->ep.maxpacket >> 1, length, sync_mode,
dma_trigger, 0);
length *= ep->maxpacket;
}
omap_set_dma_src_params(ep->lch, OMAP_DMA_PORT_EMIFF,
OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual,
0, 0);
omap_start_dma(ep->lch);
ep->dma_counter = omap_get_dma_src_pos(ep->lch);
w = omap_readw(UDC_DMA_IRQ_EN);
w |= UDC_TX_DONE_IE(ep->dma_channel);
omap_writew(w, UDC_DMA_IRQ_EN);
omap_writew(UDC_TXN_START | txdma_ctrl, UDC_TXDMA(ep->dma_channel));
req->dma_bytes = length;
}
static void finish_in_dma(struct omap_ep *ep, struct omap_req *req, int status)
{
u16 w;
if (status == 0) {
req->req.actual += req->dma_bytes;
/* return if this request needs to send data or zlp */
if (req->req.actual < req->req.length)
return;
if (req->req.zero
&& req->dma_bytes != 0
&& (req->req.actual % ep->maxpacket) == 0)
return;
} else
req->req.actual += dma_src_len(ep, req->req.dma
+ req->req.actual);
/* tx completion */
omap_stop_dma(ep->lch);
w = omap_readw(UDC_DMA_IRQ_EN);
w &= ~UDC_TX_DONE_IE(ep->dma_channel);
omap_writew(w, UDC_DMA_IRQ_EN);
done(ep, req, status);
}
static void next_out_dma(struct omap_ep *ep, struct omap_req *req)
{
unsigned packets = req->req.length - req->req.actual;
int dma_trigger = 0;
u16 w;
if (cpu_is_omap24xx())
dma_trigger = OMAP24XX_DMA(USB_W2FC_RX0, ep->dma_channel);
/* NOTE: we filtered out "short reads" before, so we know
* the buffer has only whole numbers of packets.
* except MODE SELECT(6) sent the 24 bytes data in OMAP24XX DMA mode
*/
if (cpu_is_omap24xx() && packets < ep->maxpacket) {
omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S8,
packets, 1, OMAP_DMA_SYNC_ELEMENT,
dma_trigger, 0);
req->dma_bytes = packets;
} else {
/* set up this DMA transfer, enable the fifo, start */
packets /= ep->ep.maxpacket;
packets = min(packets, (unsigned)UDC_RXN_TC + 1);
req->dma_bytes = packets * ep->ep.maxpacket;
omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S16,
ep->ep.maxpacket >> 1, packets,
OMAP_DMA_SYNC_ELEMENT,
dma_trigger, 0);
}
omap_set_dma_dest_params(ep->lch, OMAP_DMA_PORT_EMIFF,
OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual,
0, 0);
ep->dma_counter = omap_get_dma_dst_pos(ep->lch);
omap_writew(UDC_RXN_STOP | (packets - 1), UDC_RXDMA(ep->dma_channel));
w = omap_readw(UDC_DMA_IRQ_EN);
w |= UDC_RX_EOT_IE(ep->dma_channel);
omap_writew(w, UDC_DMA_IRQ_EN);
omap_writew(ep->bEndpointAddress & 0xf, UDC_EP_NUM);
omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
omap_start_dma(ep->lch);
}
static void
finish_out_dma(struct omap_ep *ep, struct omap_req *req, int status, int one)
{
u16 count, w;
if (status == 0)
ep->dma_counter = (u16) (req->req.dma + req->req.actual);
count = dma_dest_len(ep, req->req.dma + req->req.actual);
count += req->req.actual;
if (one)
count--;
if (count <= req->req.length)
req->req.actual = count;
if (count != req->dma_bytes || status)
omap_stop_dma(ep->lch);
/* if this wasn't short, request may need another transfer */
else if (req->req.actual < req->req.length)
return;
/* rx completion */
w = omap_readw(UDC_DMA_IRQ_EN);
w &= ~UDC_RX_EOT_IE(ep->dma_channel);
omap_writew(w, UDC_DMA_IRQ_EN);
done(ep, req, status);
}
static void dma_irq(struct omap_udc *udc, u16 irq_src)
{
u16 dman_stat = omap_readw(UDC_DMAN_STAT);
struct omap_ep *ep;
struct omap_req *req;
/* IN dma: tx to host */
if (irq_src & UDC_TXN_DONE) {
ep = &udc->ep[16 + UDC_DMA_TX_SRC(dman_stat)];
ep->irqs++;
/* can see TXN_DONE after dma abort */
if (!list_empty(&ep->queue)) {
req = container_of(ep->queue.next,
struct omap_req, queue);
finish_in_dma(ep, req, 0);
}
omap_writew(UDC_TXN_DONE, UDC_IRQ_SRC);
if (!list_empty (&ep->queue)) {
req = container_of(ep->queue.next,
struct omap_req, queue);
next_in_dma(ep, req);
}
}
/* OUT dma: rx from host */
if (irq_src & UDC_RXN_EOT) {
ep = &udc->ep[UDC_DMA_RX_SRC(dman_stat)];
ep->irqs++;
/* can see RXN_EOT after dma abort */
if (!list_empty(&ep->queue)) {
req = container_of(ep->queue.next,
struct omap_req, queue);
finish_out_dma(ep, req, 0, dman_stat & UDC_DMA_RX_SB);
}
omap_writew(UDC_RXN_EOT, UDC_IRQ_SRC);
if (!list_empty (&ep->queue)) {
req = container_of(ep->queue.next,
struct omap_req, queue);
next_out_dma(ep, req);
}
}
if (irq_src & UDC_RXN_CNT) {
ep = &udc->ep[UDC_DMA_RX_SRC(dman_stat)];
ep->irqs++;
/* omap15xx does this unasked... */
VDBG("%s, RX_CNT irq?\n", ep->ep.name);
omap_writew(UDC_RXN_CNT, UDC_IRQ_SRC);
}
}
static void dma_error(int lch, u16 ch_status, void *data)
{
struct omap_ep *ep = data;
/* if ch_status & OMAP_DMA_DROP_IRQ ... */
/* if ch_status & OMAP1_DMA_TOUT_IRQ ... */
ERR("%s dma error, lch %d status %02x\n", ep->ep.name, lch, ch_status);
/* complete current transfer ... */
}
static void dma_channel_claim(struct omap_ep *ep, unsigned channel)
{
u16 reg;
int status, restart, is_in;
int dma_channel;
is_in = ep->bEndpointAddress & USB_DIR_IN;
if (is_in)
reg = omap_readw(UDC_TXDMA_CFG);
else
reg = omap_readw(UDC_RXDMA_CFG);
reg |= UDC_DMA_REQ; /* "pulse" activated */
ep->dma_channel = 0;
ep->lch = -1;
if (channel == 0 || channel > 3) {
if ((reg & 0x0f00) == 0)
channel = 3;
else if ((reg & 0x00f0) == 0)
channel = 2;
else if ((reg & 0x000f) == 0) /* preferred for ISO */
channel = 1;
else {
status = -EMLINK;
goto just_restart;
}
}
reg |= (0x0f & ep->bEndpointAddress) << (4 * (channel - 1));
ep->dma_channel = channel;
if (is_in) {
if (cpu_is_omap24xx())
dma_channel = OMAP24XX_DMA(USB_W2FC_TX0, channel);
else
dma_channel = OMAP_DMA_USB_W2FC_TX0 - 1 + channel;
status = omap_request_dma(dma_channel,
ep->ep.name, dma_error, ep, &ep->lch);
if (status == 0) {
omap_writew(reg, UDC_TXDMA_CFG);
/* EMIFF or SDRC */
omap_set_dma_src_burst_mode(ep->lch,
OMAP_DMA_DATA_BURST_4);
omap_set_dma_src_data_pack(ep->lch, 1);
/* TIPB */
omap_set_dma_dest_params(ep->lch,
OMAP_DMA_PORT_TIPB,
OMAP_DMA_AMODE_CONSTANT,
UDC_DATA_DMA,
0, 0);
}
} else {
if (cpu_is_omap24xx())
dma_channel = OMAP24XX_DMA(USB_W2FC_RX0, channel);
else
dma_channel = OMAP_DMA_USB_W2FC_RX0 - 1 + channel;
status = omap_request_dma(dma_channel,
ep->ep.name, dma_error, ep, &ep->lch);
if (status == 0) {
omap_writew(reg, UDC_RXDMA_CFG);
/* TIPB */
omap_set_dma_src_params(ep->lch,
OMAP_DMA_PORT_TIPB,
OMAP_DMA_AMODE_CONSTANT,
UDC_DATA_DMA,
0, 0);
/* EMIFF or SDRC */
omap_set_dma_dest_burst_mode(ep->lch,
OMAP_DMA_DATA_BURST_4);
omap_set_dma_dest_data_pack(ep->lch, 1);
}
}
if (status)
ep->dma_channel = 0;
else {
ep->has_dma = 1;
omap_disable_dma_irq(ep->lch, OMAP_DMA_BLOCK_IRQ);
/* channel type P: hw synch (fifo) */
if (cpu_class_is_omap1() && !cpu_is_omap15xx())
omap_set_dma_channel_mode(ep->lch, OMAP_DMA_LCH_P);
}
just_restart:
/* restart any queue, even if the claim failed */
restart = !ep->stopped && !list_empty(&ep->queue);
if (status)
DBG("%s no dma channel: %d%s\n", ep->ep.name, status,
restart ? " (restart)" : "");
else
DBG("%s claimed %cxdma%d lch %d%s\n", ep->ep.name,
is_in ? 't' : 'r',
ep->dma_channel - 1, ep->lch,
restart ? " (restart)" : "");
if (restart) {
struct omap_req *req;
req = container_of(ep->queue.next, struct omap_req, queue);
if (ep->has_dma)
(is_in ? next_in_dma : next_out_dma)(ep, req);
else {
use_ep(ep, UDC_EP_SEL);
(is_in ? write_fifo : read_fifo)(ep, req);
deselect_ep();
if (!is_in) {
omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
ep->ackwait = 1 + ep->double_buf;
}
/* IN: 6 wait states before it'll tx */
}
}
}
static void dma_channel_release(struct omap_ep *ep)
{
int shift = 4 * (ep->dma_channel - 1);
u16 mask = 0x0f << shift;
struct omap_req *req;
int active;
/* abort any active usb transfer request */
if (!list_empty(&ep->queue))
req = container_of(ep->queue.next, struct omap_req, queue);
else
req = NULL;
active = omap_get_dma_active_status(ep->lch);
DBG("%s release %s %cxdma%d %p\n", ep->ep.name,
active ? "active" : "idle",
(ep->bEndpointAddress & USB_DIR_IN) ? 't' : 'r',
ep->dma_channel - 1, req);
/* NOTE: re-setting RX_REQ/TX_REQ because of a chip bug (before
* OMAP 1710 ES2.0) where reading the DMA_CFG can clear them.
*/
/* wait till current packet DMA finishes, and fifo empties */
if (ep->bEndpointAddress & USB_DIR_IN) {
omap_writew((omap_readw(UDC_TXDMA_CFG) & ~mask) | UDC_DMA_REQ,
UDC_TXDMA_CFG);
if (req) {
finish_in_dma(ep, req, -ECONNRESET);
/* clear FIFO; hosts probably won't empty it */
use_ep(ep, UDC_EP_SEL);
omap_writew(UDC_CLR_EP, UDC_CTRL);
deselect_ep();
}
while (omap_readw(UDC_TXDMA_CFG) & mask)
udelay(10);
} else {
omap_writew((omap_readw(UDC_RXDMA_CFG) & ~mask) | UDC_DMA_REQ,
UDC_RXDMA_CFG);
/* dma empties the fifo */
while (omap_readw(UDC_RXDMA_CFG) & mask)
udelay(10);
if (req)
finish_out_dma(ep, req, -ECONNRESET, 0);
}
omap_free_dma(ep->lch);
ep->dma_channel = 0;
ep->lch = -1;
/* has_dma still set, till endpoint is fully quiesced */
}
/*-------------------------------------------------------------------------*/
static int
omap_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
{
struct omap_ep *ep = container_of(_ep, struct omap_ep, ep);
struct omap_req *req = container_of(_req, struct omap_req, req);
struct omap_udc *udc;
unsigned long flags;
int is_iso = 0;
/* catch various bogus parameters */
if (!_req || !req->req.complete || !req->req.buf
|| !list_empty(&req->queue)) {
DBG("%s, bad params\n", __func__);
return -EINVAL;
}
if (!_ep || (!ep->desc && ep->bEndpointAddress)) {
DBG("%s, bad ep\n", __func__);
return -EINVAL;
}
if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
if (req->req.length > ep->ep.maxpacket)
return -EMSGSIZE;
is_iso = 1;
}
/* this isn't bogus, but OMAP DMA isn't the only hardware to
* have a hard time with partial packet reads... reject it.
* Except OMAP2 can handle the small packets.
*/
if (use_dma
&& ep->has_dma
&& ep->bEndpointAddress != 0
&& (ep->bEndpointAddress & USB_DIR_IN) == 0
&& !cpu_class_is_omap2()
&& (req->req.length % ep->ep.maxpacket) != 0) {
DBG("%s, no partial packet OUT reads\n", __func__);
return -EMSGSIZE;
}
udc = ep->udc;
if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN)
return -ESHUTDOWN;
if (use_dma && ep->has_dma) {
if (req->req.dma == DMA_ADDR_INVALID) {
req->req.dma = dma_map_single(
ep->udc->gadget.dev.parent,
req->req.buf,
req->req.length,
(ep->bEndpointAddress & USB_DIR_IN)
? DMA_TO_DEVICE
: DMA_FROM_DEVICE);
req->mapped = 1;
} else {
dma_sync_single_for_device(
ep->udc->gadget.dev.parent,
req->req.dma, req->req.length,
(ep->bEndpointAddress & USB_DIR_IN)
? DMA_TO_DEVICE
: DMA_FROM_DEVICE);
req->mapped = 0;
}
}
VDBG("%s queue req %p, len %d buf %p\n",
ep->ep.name, _req, _req->length, _req->buf);
spin_lock_irqsave(&udc->lock, flags);
req->req.status = -EINPROGRESS;
req->req.actual = 0;
/* maybe kickstart non-iso i/o queues */
if (is_iso) {
u16 w;
w = omap_readw(UDC_IRQ_EN);
w |= UDC_SOF_IE;
omap_writew(w, UDC_IRQ_EN);
} else if (list_empty(&ep->queue) && !ep->stopped && !ep->ackwait) {
int is_in;
if (ep->bEndpointAddress == 0) {
if (!udc->ep0_pending || !list_empty (&ep->queue)) {
spin_unlock_irqrestore(&udc->lock, flags);
return -EL2HLT;
}
/* empty DATA stage? */
is_in = udc->ep0_in;
if (!req->req.length) {
/* chip became CONFIGURED or ADDRESSED
* earlier; drivers may already have queued
* requests to non-control endpoints
*/
if (udc->ep0_set_config) {
u16 irq_en = omap_readw(UDC_IRQ_EN);
irq_en |= UDC_DS_CHG_IE | UDC_EP0_IE;
if (!udc->ep0_reset_config)
irq_en |= UDC_EPN_RX_IE
| UDC_EPN_TX_IE;
omap_writew(irq_en, UDC_IRQ_EN);
}
/* STATUS for zero length DATA stages is
* always an IN ... even for IN transfers,
* a weird case which seem to stall OMAP.
*/
omap_writew(UDC_EP_SEL | UDC_EP_DIR, UDC_EP_NUM);
omap_writew(UDC_CLR_EP, UDC_CTRL);
omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
omap_writew(UDC_EP_DIR, UDC_EP_NUM);
/* cleanup */
udc->ep0_pending = 0;
done(ep, req, 0);
req = NULL;
/* non-empty DATA stage */
} else if (is_in) {
omap_writew(UDC_EP_SEL | UDC_EP_DIR, UDC_EP_NUM);
} else {
if (udc->ep0_setup)
goto irq_wait;
omap_writew(UDC_EP_SEL, UDC_EP_NUM);
}
} else {
is_in = ep->bEndpointAddress & USB_DIR_IN;
if (!ep->has_dma)
use_ep(ep, UDC_EP_SEL);
/* if ISO: SOF IRQs must be enabled/disabled! */
}
if (ep->has_dma)
(is_in ? next_in_dma : next_out_dma)(ep, req);
else if (req) {
if ((is_in ? write_fifo : read_fifo)(ep, req) == 1)
req = NULL;
deselect_ep();
if (!is_in) {
omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
ep->ackwait = 1 + ep->double_buf;
}
/* IN: 6 wait states before it'll tx */
}
}
irq_wait:
/* irq handler advances the queue */
if (req != NULL)
list_add_tail(&req->queue, &ep->queue);
spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
static int omap_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
{
struct omap_ep *ep = container_of(_ep, struct omap_ep, ep);
struct omap_req *req;
unsigned long flags;
if (!_ep || !_req)
return -EINVAL;
spin_lock_irqsave(&ep->udc->lock, flags);
/* make sure it's actually 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->udc->lock, flags);
return -EINVAL;
}
if (use_dma && ep->dma_channel && ep->queue.next == &req->queue) {
int channel = ep->dma_channel;
/* releasing the channel cancels the request,
* reclaiming the channel restarts the queue
*/
dma_channel_release(ep);
dma_channel_claim(ep, channel);
} else
done(ep, req, -ECONNRESET);
spin_unlock_irqrestore(&ep->udc->lock, flags);
return 0;
}
/*-------------------------------------------------------------------------*/
static int omap_ep_set_halt(struct usb_ep *_ep, int value)
{
struct omap_ep *ep = container_of(_ep, struct omap_ep, ep);
unsigned long flags;
int status = -EOPNOTSUPP;
spin_lock_irqsave(&ep->udc->lock, flags);
/* just use protocol stalls for ep0; real halts are annoying */
if (ep->bEndpointAddress == 0) {
if (!ep->udc->ep0_pending)
status = -EINVAL;
else if (value) {
if (ep->udc->ep0_set_config) {
WARNING("error changing config?\n");
omap_writew(UDC_CLR_CFG, UDC_SYSCON2);
}
omap_writew(UDC_STALL_CMD, UDC_SYSCON2);
ep->udc->ep0_pending = 0;
status = 0;
} else /* NOP */
status = 0;
/* otherwise, all active non-ISO endpoints can halt */
} else if (ep->bmAttributes != USB_ENDPOINT_XFER_ISOC && ep->desc) {
/* IN endpoints must already be idle */
if ((ep->bEndpointAddress & USB_DIR_IN)
&& !list_empty(&ep->queue)) {
status = -EAGAIN;
goto done;
}
if (value) {
int channel;
if (use_dma && ep->dma_channel
&& !list_empty(&ep->queue)) {
channel = ep->dma_channel;
dma_channel_release(ep);
} else
channel = 0;
use_ep(ep, UDC_EP_SEL);
if (omap_readw(UDC_STAT_FLG) & UDC_NON_ISO_FIFO_EMPTY) {
omap_writew(UDC_SET_HALT, UDC_CTRL);
status = 0;
} else
status = -EAGAIN;
deselect_ep();
if (channel)
dma_channel_claim(ep, channel);
} else {
use_ep(ep, 0);
omap_writew(ep->udc->clr_halt, UDC_CTRL);
ep->ackwait = 0;
if (!(ep->bEndpointAddress & USB_DIR_IN)) {
omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
ep->ackwait = 1 + ep->double_buf;
}
}
}
done:
VDBG("%s %s halt stat %d\n", ep->ep.name,
value ? "set" : "clear", status);
spin_unlock_irqrestore(&ep->udc->lock, flags);
return status;
}
static struct usb_ep_ops omap_ep_ops = {
.enable = omap_ep_enable,
.disable = omap_ep_disable,
.alloc_request = omap_alloc_request,
.free_request = omap_free_request,
.queue = omap_ep_queue,
.dequeue = omap_ep_dequeue,
.set_halt = omap_ep_set_halt,
// fifo_status ... report bytes in fifo
// fifo_flush ... flush fifo
};
/*-------------------------------------------------------------------------*/
static int omap_get_frame(struct usb_gadget *gadget)
{
u16 sof = omap_readw(UDC_SOF);
return (sof & UDC_TS_OK) ? (sof & UDC_TS) : -EL2NSYNC;
}
static int omap_wakeup(struct usb_gadget *gadget)
{
struct omap_udc *udc;
unsigned long flags;
int retval = -EHOSTUNREACH;
udc = container_of(gadget, struct omap_udc, gadget);
spin_lock_irqsave(&udc->lock, flags);
if (udc->devstat & UDC_SUS) {
/* NOTE: OTG spec erratum says that OTG devices may
* issue wakeups without host enable.
*/
if (udc->devstat & (UDC_B_HNP_ENABLE|UDC_R_WK_OK)) {
DBG("remote wakeup...\n");
omap_writew(UDC_RMT_WKP, UDC_SYSCON2);
retval = 0;
}
/* NOTE: non-OTG systems may use SRP TOO... */
} else if (!(udc->devstat & UDC_ATT)) {
if (udc->transceiver)
retval = otg_start_srp(udc->transceiver);
}
spin_unlock_irqrestore(&udc->lock, flags);
return retval;
}
static int
omap_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
{
struct omap_udc *udc;
unsigned long flags;
u16 syscon1;
udc = container_of(gadget, struct omap_udc, gadget);
spin_lock_irqsave(&udc->lock, flags);
syscon1 = omap_readw(UDC_SYSCON1);
if (is_selfpowered)
syscon1 |= UDC_SELF_PWR;
else
syscon1 &= ~UDC_SELF_PWR;
omap_writew(syscon1, UDC_SYSCON1);
spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
static int can_pullup(struct omap_udc *udc)
{
return udc->driver && udc->softconnect && udc->vbus_active;
}
static void pullup_enable(struct omap_udc *udc)
{
u16 w;
w = omap_readw(UDC_SYSCON1);
w |= UDC_PULLUP_EN;
omap_writew(w, UDC_SYSCON1);
if (!gadget_is_otg(&udc->gadget) && !cpu_is_omap15xx()) {
u32 l;
l = omap_readl(OTG_CTRL);
l |= OTG_BSESSVLD;
omap_writel(l, OTG_CTRL);
}
omap_writew(UDC_DS_CHG_IE, UDC_IRQ_EN);
}
static void pullup_disable(struct omap_udc *udc)
{
u16 w;
if (!gadget_is_otg(&udc->gadget) && !cpu_is_omap15xx()) {
u32 l;
l = omap_readl(OTG_CTRL);
l &= ~OTG_BSESSVLD;
omap_writel(l, OTG_CTRL);
}
omap_writew(UDC_DS_CHG_IE, UDC_IRQ_EN);
w = omap_readw(UDC_SYSCON1);
w &= ~UDC_PULLUP_EN;
omap_writew(w, UDC_SYSCON1);
}
static struct omap_udc *udc;
static void omap_udc_enable_clock(int enable)
{
if (udc == NULL || udc->dc_clk == NULL || udc->hhc_clk == NULL)
return;
if (enable) {
clk_enable(udc->dc_clk);
clk_enable(udc->hhc_clk);
udelay(100);
} else {
clk_disable(udc->hhc_clk);
clk_disable(udc->dc_clk);
}
}
/*
* Called by whatever detects VBUS sessions: external transceiver
* driver, or maybe GPIO0 VBUS IRQ. May request 48 MHz clock.
*/
static int omap_vbus_session(struct usb_gadget *gadget, int is_active)
{
struct omap_udc *udc;
unsigned long flags;
u32 l;
udc = container_of(gadget, struct omap_udc, gadget);
spin_lock_irqsave(&udc->lock, flags);
VDBG("VBUS %s\n", is_active ? "on" : "off");
udc->vbus_active = (is_active != 0);
if (cpu_is_omap15xx()) {
/* "software" detect, ignored if !VBUS_MODE_1510 */
l = omap_readl(FUNC_MUX_CTRL_0);
if (is_active)
l |= VBUS_CTRL_1510;
else
l &= ~VBUS_CTRL_1510;
omap_writel(l, FUNC_MUX_CTRL_0);
}
if (udc->dc_clk != NULL && is_active) {
if (!udc->clk_requested) {
omap_udc_enable_clock(1);
udc->clk_requested = 1;
}
}
if (can_pullup(udc))
pullup_enable(udc);
else
pullup_disable(udc);
if (udc->dc_clk != NULL && !is_active) {
if (udc->clk_requested) {
omap_udc_enable_clock(0);
udc->clk_requested = 0;
}
}
spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
static int omap_vbus_draw(struct usb_gadget *gadget, unsigned mA)
{
struct omap_udc *udc;
udc = container_of(gadget, struct omap_udc, gadget);
if (udc->transceiver)
return otg_set_power(udc->transceiver, mA);
return -EOPNOTSUPP;
}
static int omap_pullup(struct usb_gadget *gadget, int is_on)
{
struct omap_udc *udc;
unsigned long flags;
udc = container_of(gadget, struct omap_udc, gadget);
spin_lock_irqsave(&udc->lock, flags);
udc->softconnect = (is_on != 0);
if (can_pullup(udc))
pullup_enable(udc);
else
pullup_disable(udc);
spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
static struct usb_gadget_ops omap_gadget_ops = {
.get_frame = omap_get_frame,
.wakeup = omap_wakeup,
.set_selfpowered = omap_set_selfpowered,
.vbus_session = omap_vbus_session,
.vbus_draw = omap_vbus_draw,
.pullup = omap_pullup,
};
/*-------------------------------------------------------------------------*/
/* dequeue ALL requests; caller holds udc->lock */
static void nuke(struct omap_ep *ep, int status)
{
struct omap_req *req;
ep->stopped = 1;
if (use_dma && ep->dma_channel)
dma_channel_release(ep);
use_ep(ep, 0);
omap_writew(UDC_CLR_EP, UDC_CTRL);
if (ep->bEndpointAddress && ep->bmAttributes != USB_ENDPOINT_XFER_ISOC)
omap_writew(UDC_SET_HALT, UDC_CTRL);
while (!list_empty(&ep->queue)) {
req = list_entry(ep->queue.next, struct omap_req, queue);
done(ep, req, status);
}
}
/* caller holds udc->lock */
static void udc_quiesce(struct omap_udc *udc)
{
struct omap_ep *ep;
udc->gadget.speed = USB_SPEED_UNKNOWN;
nuke(&udc->ep[0], -ESHUTDOWN);
list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list)
nuke(ep, -ESHUTDOWN);
}
/*-------------------------------------------------------------------------*/
static void update_otg(struct omap_udc *udc)
{
u16 devstat;
if (!gadget_is_otg(&udc->gadget))
return;
if (omap_readl(OTG_CTRL) & OTG_ID)
devstat = omap_readw(UDC_DEVSTAT);
else
devstat = 0;
udc->gadget.b_hnp_enable = !!(devstat & UDC_B_HNP_ENABLE);
udc->gadget.a_hnp_support = !!(devstat & UDC_A_HNP_SUPPORT);
udc->gadget.a_alt_hnp_support = !!(devstat & UDC_A_ALT_HNP_SUPPORT);
/* Enable HNP early, avoiding races on suspend irq path.
* ASSUMES OTG state machine B_BUS_REQ input is true.
*/
if (udc->gadget.b_hnp_enable) {
u32 l;
l = omap_readl(OTG_CTRL);
l |= OTG_B_HNPEN | OTG_B_BUSREQ;
l &= ~OTG_PULLUP;
omap_writel(l, OTG_CTRL);
}
}
static void ep0_irq(struct omap_udc *udc, u16 irq_src)
{
struct omap_ep *ep0 = &udc->ep[0];
struct omap_req *req = NULL;
ep0->irqs++;
/* Clear any pending requests and then scrub any rx/tx state
* before starting to handle the SETUP request.
*/
if (irq_src & UDC_SETUP) {
u16 ack = irq_src & (UDC_EP0_TX|UDC_EP0_RX);
nuke(ep0, 0);
if (ack) {
omap_writew(ack, UDC_IRQ_SRC);
irq_src = UDC_SETUP;
}
}
/* IN/OUT packets mean we're in the DATA or STATUS stage.
* This driver uses only uses protocol stalls (ep0 never halts),
* and if we got this far the gadget driver already had a
* chance to stall. Tries to be forgiving of host oddities.
*
* NOTE: the last chance gadget drivers have to stall control
* requests is during their request completion callback.
*/
if (!list_empty(&ep0->queue))
req = container_of(ep0->queue.next, struct omap_req, queue);
/* IN == TX to host */
if (irq_src & UDC_EP0_TX) {
int stat;
omap_writew(UDC_EP0_TX, UDC_IRQ_SRC);
omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM);
stat = omap_readw(UDC_STAT_FLG);
if (stat & UDC_ACK) {
if (udc->ep0_in) {
/* write next IN packet from response,
* or set up the status stage.
*/
if (req)
stat = write_fifo(ep0, req);
omap_writew(UDC_EP_DIR, UDC_EP_NUM);
if (!req && udc->ep0_pending) {
omap_writew(UDC_EP_SEL, UDC_EP_NUM);
omap_writew(UDC_CLR_EP, UDC_CTRL);
omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
omap_writew(0, UDC_EP_NUM);
udc->ep0_pending = 0;
} /* else: 6 wait states before it'll tx */
} else {
/* ack status stage of OUT transfer */
omap_writew(UDC_EP_DIR, UDC_EP_NUM);
if (req)
done(ep0, req, 0);
}
req = NULL;
} else if (stat & UDC_STALL) {
omap_writew(UDC_CLR_HALT, UDC_CTRL);
omap_writew(UDC_EP_DIR, UDC_EP_NUM);
} else {
omap_writew(UDC_EP_DIR, UDC_EP_NUM);
}
}
/* OUT == RX from host */
if (irq_src & UDC_EP0_RX) {
int stat;
omap_writew(UDC_EP0_RX, UDC_IRQ_SRC);
omap_writew(UDC_EP_SEL, UDC_EP_NUM);
stat = omap_readw(UDC_STAT_FLG);
if (stat & UDC_ACK) {
if (!udc->ep0_in) {
stat = 0;
/* read next OUT packet of request, maybe
* reactiviting the fifo; stall on errors.
*/
if (!req || (stat = read_fifo(ep0, req)) < 0) {
omap_writew(UDC_STALL_CMD, UDC_SYSCON2);
udc->ep0_pending = 0;
stat = 0;
} else if (stat == 0)
omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
omap_writew(0, UDC_EP_NUM);
/* activate status stage */
if (stat == 1) {
done(ep0, req, 0);
/* that may have STALLed ep0... */
omap_writew(UDC_EP_SEL | UDC_EP_DIR,
UDC_EP_NUM);
omap_writew(UDC_CLR_EP, UDC_CTRL);
omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
omap_writew(UDC_EP_DIR, UDC_EP_NUM);
udc->ep0_pending = 0;
}
} else {
/* ack status stage of IN transfer */
omap_writew(0, UDC_EP_NUM);
if (req)
done(ep0, req, 0);
}
} else if (stat & UDC_STALL) {
omap_writew(UDC_CLR_HALT, UDC_CTRL);
omap_writew(0, UDC_EP_NUM);
} else {
omap_writew(0, UDC_EP_NUM);
}
}
/* SETUP starts all control transfers */
if (irq_src & UDC_SETUP) {
union u {
u16 word[4];
struct usb_ctrlrequest r;
} u;
int status = -EINVAL;
struct omap_ep *ep;
/* read the (latest) SETUP message */
do {
omap_writew(UDC_SETUP_SEL, UDC_EP_NUM);
/* two bytes at a time */
u.word[0] = omap_readw(UDC_DATA);
u.word[1] = omap_readw(UDC_DATA);
u.word[2] = omap_readw(UDC_DATA);
u.word[3] = omap_readw(UDC_DATA);
omap_writew(0, UDC_EP_NUM);
} while (omap_readw(UDC_IRQ_SRC) & UDC_SETUP);
#define w_value le16_to_cpu(u.r.wValue)
#define w_index le16_to_cpu(u.r.wIndex)
#define w_length le16_to_cpu(u.r.wLength)
/* Delegate almost all control requests to the gadget driver,
* except for a handful of ch9 status/feature requests that
* hardware doesn't autodecode _and_ the gadget API hides.
*/
udc->ep0_in = (u.r.bRequestType & USB_DIR_IN) != 0;
udc->ep0_set_config = 0;
udc->ep0_pending = 1;
ep0->stopped = 0;
ep0->ackwait = 0;
switch (u.r.bRequest) {
case USB_REQ_SET_CONFIGURATION:
/* udc needs to know when ep != 0 is valid */
if (u.r.bRequestType != USB_RECIP_DEVICE)
goto delegate;
if (w_length != 0)
goto do_stall;
udc->ep0_set_config = 1;
udc->ep0_reset_config = (w_value == 0);
VDBG("set config %d\n", w_value);
/* update udc NOW since gadget driver may start
* queueing requests immediately; clear config
* later if it fails the request.
*/
if (udc->ep0_reset_config)
omap_writew(UDC_CLR_CFG, UDC_SYSCON2);
else
omap_writew(UDC_DEV_CFG, UDC_SYSCON2);
update_otg(udc);
goto delegate;
case USB_REQ_CLEAR_FEATURE:
/* clear endpoint halt */
if (u.r.bRequestType != USB_RECIP_ENDPOINT)
goto delegate;
if (w_value != USB_ENDPOINT_HALT
|| w_length != 0)
goto do_stall;
ep = &udc->ep[w_index & 0xf];
if (ep != ep0) {
if (w_index & USB_DIR_IN)
ep += 16;
if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
|| !ep->desc)
goto do_stall;
use_ep(ep, 0);
omap_writew(udc->clr_halt, UDC_CTRL);
ep->ackwait = 0;
if (!(ep->bEndpointAddress & USB_DIR_IN)) {
omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
ep->ackwait = 1 + ep->double_buf;
}
/* NOTE: assumes the host behaves sanely,
* only clearing real halts. Else we may
* need to kill pending transfers and then
* restart the queue... very messy for DMA!
*/
}
VDBG("%s halt cleared by host\n", ep->name);
goto ep0out_status_stage;
case USB_REQ_SET_FEATURE:
/* set endpoint halt */
if (u.r.bRequestType != USB_RECIP_ENDPOINT)
goto delegate;
if (w_value != USB_ENDPOINT_HALT
|| w_length != 0)
goto do_stall;
ep = &udc->ep[w_index & 0xf];
if (w_index & USB_DIR_IN)
ep += 16;
if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
|| ep == ep0 || !ep->desc)
goto do_stall;
if (use_dma && ep->has_dma) {
/* this has rude side-effects (aborts) and
* can't really work if DMA-IN is active
*/
DBG("%s host set_halt, NYET \n", ep->name);
goto do_stall;
}
use_ep(ep, 0);
/* can't halt if fifo isn't empty... */
omap_writew(UDC_CLR_EP, UDC_CTRL);
omap_writew(UDC_SET_HALT, UDC_CTRL);
VDBG("%s halted by host\n", ep->name);
ep0out_status_stage:
status = 0;
omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM);
omap_writew(UDC_CLR_EP, UDC_CTRL);
omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
omap_writew(UDC_EP_DIR, UDC_EP_NUM);
udc->ep0_pending = 0;
break;
case USB_REQ_GET_STATUS:
/* USB_ENDPOINT_HALT status? */
if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
goto intf_status;
/* ep0 never stalls */
if (!(w_index & 0xf))
goto zero_status;
/* only active endpoints count */
ep = &udc->ep[w_index & 0xf];
if (w_index & USB_DIR_IN)
ep += 16;
if (!ep->desc)
goto do_stall;
/* iso never stalls */
if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
goto zero_status;
/* FIXME don't assume non-halted endpoints!! */
ERR("%s status, can't report\n", ep->ep.name);
goto do_stall;
intf_status:
/* return interface status. if we were pedantic,
* we'd detect non-existent interfaces, and stall.
*/
if (u.r.bRequestType
!= (USB_DIR_IN|USB_RECIP_INTERFACE))
goto delegate;
zero_status:
/* return two zero bytes */
omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM);
omap_writew(0, UDC_DATA);
omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
omap_writew(UDC_EP_DIR, UDC_EP_NUM);
status = 0;
VDBG("GET_STATUS, interface %d\n", w_index);
/* next, status stage */
break;
default:
delegate:
/* activate the ep0out fifo right away */
if (!udc->ep0_in && w_length) {
omap_writew(0, UDC_EP_NUM);
omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
}
/* gadget drivers see class/vendor specific requests,
* {SET,GET}_{INTERFACE,DESCRIPTOR,CONFIGURATION},
* and more
*/
VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
u.r.bRequestType, u.r.bRequest,
w_value, w_index, w_length);
#undef w_value
#undef w_index
#undef w_length
/* The gadget driver may return an error here,
* causing an immediate protocol stall.
*
* Else it must issue a response, either queueing a
* response buffer for the DATA stage, or halting ep0
* (causing a protocol stall, not a real halt). A
* zero length buffer means no DATA stage.
*
* It's fine to issue that response after the setup()
* call returns, and this IRQ was handled.
*/
udc->ep0_setup = 1;
spin_unlock(&udc->lock);
status = udc->driver->setup (&udc->gadget, &u.r);
spin_lock(&udc->lock);
udc->ep0_setup = 0;
}
if (status < 0) {
do_stall:
VDBG("req %02x.%02x protocol STALL; stat %d\n",
u.r.bRequestType, u.r.bRequest, status);
if (udc->ep0_set_config) {
if (udc->ep0_reset_config)
WARNING("error resetting config?\n");
else
omap_writew(UDC_CLR_CFG, UDC_SYSCON2);
}
omap_writew(UDC_STALL_CMD, UDC_SYSCON2);
udc->ep0_pending = 0;
}
}
}
/*-------------------------------------------------------------------------*/
#define OTG_FLAGS (UDC_B_HNP_ENABLE|UDC_A_HNP_SUPPORT|UDC_A_ALT_HNP_SUPPORT)
static void devstate_irq(struct omap_udc *udc, u16 irq_src)
{
u16 devstat, change;
devstat = omap_readw(UDC_DEVSTAT);
change = devstat ^ udc->devstat;
udc->devstat = devstat;
if (change & (UDC_USB_RESET|UDC_ATT)) {
udc_quiesce(udc);
if (change & UDC_ATT) {
/* driver for any external transceiver will
* have called omap_vbus_session() already
*/
if (devstat & UDC_ATT) {
udc->gadget.speed = USB_SPEED_FULL;
VDBG("connect\n");
if (!udc->transceiver)
pullup_enable(udc);
// if (driver->connect) call it
} else if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
udc->gadget.speed = USB_SPEED_UNKNOWN;
if (!udc->transceiver)
pullup_disable(udc);
DBG("disconnect, gadget %s\n",
udc->driver->driver.name);
if (udc->driver->disconnect) {
spin_unlock(&udc->lock);
udc->driver->disconnect(&udc->gadget);
spin_lock(&udc->lock);
}
}
change &= ~UDC_ATT;
}
if (change & UDC_USB_RESET) {
if (devstat & UDC_USB_RESET) {
VDBG("RESET=1\n");
} else {
udc->gadget.speed = USB_SPEED_FULL;
INFO("USB reset done, gadget %s\n",
udc->driver->driver.name);
/* ep0 traffic is legal from now on */
omap_writew(UDC_DS_CHG_IE | UDC_EP0_IE,
UDC_IRQ_EN);
}
change &= ~UDC_USB_RESET;
}
}
if (change & UDC_SUS) {
if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
// FIXME tell isp1301 to suspend/resume (?)
if (devstat & UDC_SUS) {
VDBG("suspend\n");
update_otg(udc);
/* HNP could be under way already */
if (udc->gadget.speed == USB_SPEED_FULL
&& udc->driver->suspend) {
spin_unlock(&udc->lock);
udc->driver->suspend(&udc->gadget);
spin_lock(&udc->lock);
}
if (udc->transceiver)
otg_set_suspend(udc->transceiver, 1);
} else {
VDBG("resume\n");
if (udc->transceiver)
otg_set_suspend(udc->transceiver, 0);
if (udc->gadget.speed == USB_SPEED_FULL
&& udc->driver->resume) {
spin_unlock(&udc->lock);
udc->driver->resume(&udc->gadget);
spin_lock(&udc->lock);
}
}
}
change &= ~UDC_SUS;
}
if (!cpu_is_omap15xx() && (change & OTG_FLAGS)) {
update_otg(udc);
change &= ~OTG_FLAGS;
}
change &= ~(UDC_CFG|UDC_DEF|UDC_ADD);
if (change)
VDBG("devstat %03x, ignore change %03x\n",
devstat, change);
omap_writew(UDC_DS_CHG, UDC_IRQ_SRC);
}
static irqreturn_t omap_udc_irq(int irq, void *_udc)
{
struct omap_udc *udc = _udc;
u16 irq_src;
irqreturn_t status = IRQ_NONE;
unsigned long flags;
spin_lock_irqsave(&udc->lock, flags);
irq_src = omap_readw(UDC_IRQ_SRC);
/* Device state change (usb ch9 stuff) */
if (irq_src & UDC_DS_CHG) {
devstate_irq(_udc, irq_src);
status = IRQ_HANDLED;
irq_src &= ~UDC_DS_CHG;
}
/* EP0 control transfers */
if (irq_src & (UDC_EP0_RX|UDC_SETUP|UDC_EP0_TX)) {
ep0_irq(_udc, irq_src);
status = IRQ_HANDLED;
irq_src &= ~(UDC_EP0_RX|UDC_SETUP|UDC_EP0_TX);
}
/* DMA transfer completion */
if (use_dma && (irq_src & (UDC_TXN_DONE|UDC_RXN_CNT|UDC_RXN_EOT))) {
dma_irq(_udc, irq_src);
status = IRQ_HANDLED;
irq_src &= ~(UDC_TXN_DONE|UDC_RXN_CNT|UDC_RXN_EOT);
}
irq_src &= ~(UDC_IRQ_SOF | UDC_EPN_TX|UDC_EPN_RX);
if (irq_src)
DBG("udc_irq, unhandled %03x\n", irq_src);
spin_unlock_irqrestore(&udc->lock, flags);
return status;
}
/* workaround for seemingly-lost IRQs for RX ACKs... */
#define PIO_OUT_TIMEOUT (jiffies + HZ/3)
#define HALF_FULL(f) (!((f)&(UDC_NON_ISO_FIFO_FULL|UDC_NON_ISO_FIFO_EMPTY)))
static void pio_out_timer(unsigned long _ep)
{
struct omap_ep *ep = (void *) _ep;
unsigned long flags;
u16 stat_flg;
spin_lock_irqsave(&ep->udc->lock, flags);
if (!list_empty(&ep->queue) && ep->ackwait) {
use_ep(ep, UDC_EP_SEL);
stat_flg = omap_readw(UDC_STAT_FLG);
if ((stat_flg & UDC_ACK) && (!(stat_flg & UDC_FIFO_EN)
|| (ep->double_buf && HALF_FULL(stat_flg)))) {
struct omap_req *req;
VDBG("%s: lose, %04x\n", ep->ep.name, stat_flg);
req = container_of(ep->queue.next,
struct omap_req, queue);
(void) read_fifo(ep, req);
omap_writew(ep->bEndpointAddress, UDC_EP_NUM);
omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
ep->ackwait = 1 + ep->double_buf;
} else
deselect_ep();
}
mod_timer(&ep->timer, PIO_OUT_TIMEOUT);
spin_unlock_irqrestore(&ep->udc->lock, flags);
}
static irqreturn_t omap_udc_pio_irq(int irq, void *_dev)
{
u16 epn_stat, irq_src;
irqreturn_t status = IRQ_NONE;
struct omap_ep *ep;
int epnum;
struct omap_udc *udc = _dev;
struct omap_req *req;
unsigned long flags;
spin_lock_irqsave(&udc->lock, flags);
epn_stat = omap_readw(UDC_EPN_STAT);
irq_src = omap_readw(UDC_IRQ_SRC);
/* handle OUT first, to avoid some wasteful NAKs */
if (irq_src & UDC_EPN_RX) {
epnum = (epn_stat >> 8) & 0x0f;
omap_writew(UDC_EPN_RX, UDC_IRQ_SRC);
status = IRQ_HANDLED;
ep = &udc->ep[epnum];
ep->irqs++;
omap_writew(epnum | UDC_EP_SEL, UDC_EP_NUM);
ep->fnf = 0;
if (omap_readw(UDC_STAT_FLG) & UDC_ACK) {
ep->ackwait--;
if (!list_empty(&ep->queue)) {
int stat;
req = container_of(ep->queue.next,
struct omap_req, queue);
stat = read_fifo(ep, req);
if (!ep->double_buf)
ep->fnf = 1;
}
}
/* min 6 clock delay before clearing EP_SEL ... */
epn_stat = omap_readw(UDC_EPN_STAT);
epn_stat = omap_readw(UDC_EPN_STAT);
omap_writew(epnum, UDC_EP_NUM);
/* enabling fifo _after_ clearing ACK, contrary to docs,
* reduces lossage; timer still needed though (sigh).
*/
if (ep->fnf) {
omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
ep->ackwait = 1 + ep->double_buf;
}
mod_timer(&ep->timer, PIO_OUT_TIMEOUT);
}
/* then IN transfers */
else if (irq_src & UDC_EPN_TX) {
epnum = epn_stat & 0x0f;
omap_writew(UDC_EPN_TX, UDC_IRQ_SRC);
status = IRQ_HANDLED;
ep = &udc->ep[16 + epnum];
ep->irqs++;
omap_writew(epnum | UDC_EP_DIR | UDC_EP_SEL, UDC_EP_NUM);
if (omap_readw(UDC_STAT_FLG) & UDC_ACK) {
ep->ackwait = 0;
if (!list_empty(&ep->queue)) {
req = container_of(ep->queue.next,
struct omap_req, queue);
(void) write_fifo(ep, req);
}
}
/* min 6 clock delay before clearing EP_SEL ... */
epn_stat = omap_readw(UDC_EPN_STAT);
epn_stat = omap_readw(UDC_EPN_STAT);
omap_writew(epnum | UDC_EP_DIR, UDC_EP_NUM);
/* then 6 clocks before it'd tx */
}
spin_unlock_irqrestore(&udc->lock, flags);
return status;
}
#ifdef USE_ISO
static irqreturn_t omap_udc_iso_irq(int irq, void *_dev)
{
struct omap_udc *udc = _dev;
struct omap_ep *ep;
int pending = 0;
unsigned long flags;
spin_lock_irqsave(&udc->lock, flags);
/* handle all non-DMA ISO transfers */
list_for_each_entry (ep, &udc->iso, iso) {
u16 stat;
struct omap_req *req;
if (ep->has_dma || list_empty(&ep->queue))
continue;
req = list_entry(ep->queue.next, struct omap_req, queue);
use_ep(ep, UDC_EP_SEL);
stat = omap_readw(UDC_STAT_FLG);
/* NOTE: like the other controller drivers, this isn't
* currently reporting lost or damaged frames.
*/
if (ep->bEndpointAddress & USB_DIR_IN) {
if (stat & UDC_MISS_IN)
/* done(ep, req, -EPROTO) */;
else
write_fifo(ep, req);
} else {
int status = 0;
if (stat & UDC_NO_RXPACKET)
status = -EREMOTEIO;
else if (stat & UDC_ISO_ERR)
status = -EILSEQ;
else if (stat & UDC_DATA_FLUSH)
status = -ENOSR;
if (status)
/* done(ep, req, status) */;
else
read_fifo(ep, req);
}
deselect_ep();
/* 6 wait states before next EP */
ep->irqs++;
if (!list_empty(&ep->queue))
pending = 1;
}
if (!pending) {
u16 w;
w = omap_readw(UDC_IRQ_EN);
w &= ~UDC_SOF_IE;
omap_writew(w, UDC_IRQ_EN);
}
omap_writew(UDC_IRQ_SOF, UDC_IRQ_SRC);
spin_unlock_irqrestore(&udc->lock, flags);
return IRQ_HANDLED;
}
#endif
/*-------------------------------------------------------------------------*/
static inline int machine_without_vbus_sense(void)
{
return (machine_is_omap_innovator()
|| machine_is_omap_osk()
|| machine_is_omap_apollon()
#ifndef CONFIG_MACH_OMAP_H4_OTG
|| machine_is_omap_h4()
#endif
|| machine_is_sx1()
|| cpu_is_omap7xx() /* No known omap7xx boards with vbus sense */
);
}
int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
int (*bind)(struct usb_gadget *))
{
int status = -ENODEV;
struct omap_ep *ep;
unsigned long flags;
/* basic sanity tests */
if (!udc)
return -ENODEV;
if (!driver
// FIXME if otg, check: driver->is_otg
|| driver->speed < USB_SPEED_FULL
|| !bind || !driver->setup)
return -EINVAL;
spin_lock_irqsave(&udc->lock, flags);
if (udc->driver) {
spin_unlock_irqrestore(&udc->lock, flags);
return -EBUSY;
}
/* reset state */
list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
ep->irqs = 0;
if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
continue;
use_ep(ep, 0);
omap_writew(UDC_SET_HALT, UDC_CTRL);
}
udc->ep0_pending = 0;
udc->ep[0].irqs = 0;
udc->softconnect = 1;
/* hook up the driver */
driver->driver.bus = NULL;
udc->driver = driver;
udc->gadget.dev.driver = &driver->driver;
spin_unlock_irqrestore(&udc->lock, flags);
if (udc->dc_clk != NULL)
omap_udc_enable_clock(1);
status = bind(&udc->gadget);
if (status) {
DBG("bind to %s --> %d\n", driver->driver.name, status);
udc->gadget.dev.driver = NULL;
udc->driver = NULL;
goto done;
}
DBG("bound to driver %s\n", driver->driver.name);
omap_writew(UDC_IRQ_SRC_MASK, UDC_IRQ_SRC);
/* connect to bus through transceiver */
if (udc->transceiver) {
status = otg_set_peripheral(udc->transceiver, &udc->gadget);
if (status < 0) {
ERR("can't bind to transceiver\n");
if (driver->unbind) {
driver->unbind (&udc->gadget);
udc->gadget.dev.driver = NULL;
udc->driver = NULL;
}
goto done;
}
} else {
if (can_pullup(udc))
pullup_enable (udc);
else
pullup_disable (udc);
}
/* boards that don't have VBUS sensing can't autogate 48MHz;
* can't enter deep sleep while a gadget driver is active.
*/
if (machine_without_vbus_sense())
omap_vbus_session(&udc->gadget, 1);
done:
if (udc->dc_clk != NULL)
omap_udc_enable_clock(0);
return status;
}
EXPORT_SYMBOL(usb_gadget_probe_driver);
int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
{
unsigned long flags;
int status = -ENODEV;
if (!udc)
return -ENODEV;
if (!driver || driver != udc->driver || !driver->unbind)
return -EINVAL;
if (udc->dc_clk != NULL)
omap_udc_enable_clock(1);
if (machine_without_vbus_sense())
omap_vbus_session(&udc->gadget, 0);
if (udc->transceiver)
(void) otg_set_peripheral(udc->transceiver, NULL);
else
pullup_disable(udc);
spin_lock_irqsave(&udc->lock, flags);
udc_quiesce(udc);
spin_unlock_irqrestore(&udc->lock, flags);
driver->unbind(&udc->gadget);
udc->gadget.dev.driver = NULL;
udc->driver = NULL;
if (udc->dc_clk != NULL)
omap_udc_enable_clock(0);
DBG("unregistered driver '%s'\n", driver->driver.name);
return status;
}
EXPORT_SYMBOL(usb_gadget_unregister_driver);
/*-------------------------------------------------------------------------*/
#ifdef CONFIG_USB_GADGET_DEBUG_FILES
#include <linux/seq_file.h>
static const char proc_filename[] = "driver/udc";
#define FOURBITS "%s%s%s%s"
#define EIGHTBITS FOURBITS FOURBITS
static void proc_ep_show(struct seq_file *s, struct omap_ep *ep)
{
u16 stat_flg;
struct omap_req *req;
char buf[20];
use_ep(ep, 0);
if (use_dma && ep->has_dma)
snprintf(buf, sizeof buf, "(%cxdma%d lch%d) ",
(ep->bEndpointAddress & USB_DIR_IN) ? 't' : 'r',
ep->dma_channel - 1, ep->lch);
else
buf[0] = 0;
stat_flg = omap_readw(UDC_STAT_FLG);
seq_printf(s,
"\n%s %s%s%sirqs %ld stat %04x " EIGHTBITS FOURBITS "%s\n",
ep->name, buf,
ep->double_buf ? "dbuf " : "",
({char *s; switch(ep->ackwait){
case 0: s = ""; break;
case 1: s = "(ackw) "; break;
case 2: s = "(ackw2) "; break;
default: s = "(?) "; break;
} s;}),
ep->irqs, stat_flg,
(stat_flg & UDC_NO_RXPACKET) ? "no_rxpacket " : "",
(stat_flg & UDC_MISS_IN) ? "miss_in " : "",
(stat_flg & UDC_DATA_FLUSH) ? "data_flush " : "",
(stat_flg & UDC_ISO_ERR) ? "iso_err " : "",
(stat_flg & UDC_ISO_FIFO_EMPTY) ? "iso_fifo_empty " : "",
(stat_flg & UDC_ISO_FIFO_FULL) ? "iso_fifo_full " : "",
(stat_flg & UDC_EP_HALTED) ? "HALT " : "",
(stat_flg & UDC_STALL) ? "STALL " : "",
(stat_flg & UDC_NAK) ? "NAK " : "",
(stat_flg & UDC_ACK) ? "ACK " : "",
(stat_flg & UDC_FIFO_EN) ? "fifo_en " : "",
(stat_flg & UDC_NON_ISO_FIFO_EMPTY) ? "fifo_empty " : "",
(stat_flg & UDC_NON_ISO_FIFO_FULL) ? "fifo_full " : "");
if (list_empty (&ep->queue))
seq_printf(s, "\t(queue empty)\n");
else
list_for_each_entry (req, &ep->queue, queue) {
unsigned length = req->req.actual;
if (use_dma && buf[0]) {
length += ((ep->bEndpointAddress & USB_DIR_IN)
? dma_src_len : dma_dest_len)
(ep, req->req.dma + length);
buf[0] = 0;
}
seq_printf(s, "\treq %p len %d/%d buf %p\n",
&req->req, length,
req->req.length, req->req.buf);
}
}
static char *trx_mode(unsigned m, int enabled)
{
switch (m) {
case 0: return enabled ? "*6wire" : "unused";
case 1: return "4wire";
case 2: return "3wire";
case 3: return "6wire";
default: return "unknown";
}
}
static int proc_otg_show(struct seq_file *s)
{
u32 tmp;
u32 trans = 0;
char *ctrl_name = "(UNKNOWN)";
/* XXX This needs major revision for OMAP2+ */
tmp = omap_readl(OTG_REV);
if (cpu_class_is_omap1()) {
ctrl_name = "tranceiver_ctrl";
trans = omap_readw(USB_TRANSCEIVER_CTRL);
}
seq_printf(s, "\nOTG rev %d.%d, %s %05x\n",
tmp >> 4, tmp & 0xf, ctrl_name, trans);
tmp = omap_readw(OTG_SYSCON_1);
seq_printf(s, "otg_syscon1 %08x usb2 %s, usb1 %s, usb0 %s,"
FOURBITS "\n", tmp,
trx_mode(USB2_TRX_MODE(tmp), trans & CONF_USB2_UNI_R),
trx_mode(USB1_TRX_MODE(tmp), trans & CONF_USB1_UNI_R),
(USB0_TRX_MODE(tmp) == 0 && !cpu_is_omap1710())
? "internal"
: trx_mode(USB0_TRX_MODE(tmp), 1),
(tmp & OTG_IDLE_EN) ? " !otg" : "",
(tmp & HST_IDLE_EN) ? " !host" : "",
(tmp & DEV_IDLE_EN) ? " !dev" : "",
(tmp & OTG_RESET_DONE) ? " reset_done" : " reset_active");
tmp = omap_readl(OTG_SYSCON_2);
seq_printf(s, "otg_syscon2 %08x%s" EIGHTBITS
" b_ase_brst=%d hmc=%d\n", tmp,
(tmp & OTG_EN) ? " otg_en" : "",
(tmp & USBX_SYNCHRO) ? " synchro" : "",
// much more SRP stuff
(tmp & SRP_DATA) ? " srp_data" : "",
(tmp & SRP_VBUS) ? " srp_vbus" : "",
(tmp & OTG_PADEN) ? " otg_paden" : "",
(tmp & HMC_PADEN) ? " hmc_paden" : "",
(tmp & UHOST_EN) ? " uhost_en" : "",
(tmp & HMC_TLLSPEED) ? " tllspeed" : "",
(tmp & HMC_TLLATTACH) ? " tllattach" : "",
B_ASE_BRST(tmp),
OTG_HMC(tmp));
tmp = omap_readl(OTG_CTRL);
seq_printf(s, "otg_ctrl %06x" EIGHTBITS EIGHTBITS "%s\n", tmp,
(tmp & OTG_ASESSVLD) ? " asess" : "",
(tmp & OTG_BSESSEND) ? " bsess_end" : "",
(tmp & OTG_BSESSVLD) ? " bsess" : "",
(tmp & OTG_VBUSVLD) ? " vbus" : "",
(tmp & OTG_ID) ? " id" : "",
(tmp & OTG_DRIVER_SEL) ? " DEVICE" : " HOST",
(tmp & OTG_A_SETB_HNPEN) ? " a_setb_hnpen" : "",
(tmp & OTG_A_BUSREQ) ? " a_bus" : "",
(tmp & OTG_B_HNPEN) ? " b_hnpen" : "",
(tmp & OTG_B_BUSREQ) ? " b_bus" : "",
(tmp & OTG_BUSDROP) ? " busdrop" : "",
(tmp & OTG_PULLDOWN) ? " down" : "",
(tmp & OTG_PULLUP) ? " up" : "",
(tmp & OTG_DRV_VBUS) ? " drv" : "",
(tmp & OTG_PD_VBUS) ? " pd_vb" : "",
(tmp & OTG_PU_VBUS) ? " pu_vb" : "",
(tmp & OTG_PU_ID) ? " pu_id" : ""
);
tmp = omap_readw(OTG_IRQ_EN);
seq_printf(s, "otg_irq_en %04x" "\n", tmp);
tmp = omap_readw(OTG_IRQ_SRC);
seq_printf(s, "otg_irq_src %04x" "\n", tmp);
tmp = omap_readw(OTG_OUTCTRL);
seq_printf(s, "otg_outctrl %04x" "\n", tmp);
tmp = omap_readw(OTG_TEST);
seq_printf(s, "otg_test %04x" "\n", tmp);
return 0;
}
static int proc_udc_show(struct seq_file *s, void *_)
{
u32 tmp;
struct omap_ep *ep;
unsigned long flags;
spin_lock_irqsave(&udc->lock, flags);
seq_printf(s, "%s, version: " DRIVER_VERSION
#ifdef USE_ISO
" (iso)"
#endif
"%s\n",
driver_desc,
use_dma ? " (dma)" : "");
tmp = omap_readw(UDC_REV) & 0xff;
seq_printf(s,
"UDC rev %d.%d, fifo mode %d, gadget %s\n"
"hmc %d, transceiver %s\n",
tmp >> 4, tmp & 0xf,
fifo_mode,
udc->driver ? udc->driver->driver.name : "(none)",
HMC,
udc->transceiver
? udc->transceiver->label
: ((cpu_is_omap1710() || cpu_is_omap24xx())
? "external" : "(none)"));
if (cpu_class_is_omap1()) {
seq_printf(s, "ULPD control %04x req %04x status %04x\n",
omap_readw(ULPD_CLOCK_CTRL),
omap_readw(ULPD_SOFT_REQ),
omap_readw(ULPD_STATUS_REQ));
}
/* OTG controller registers */
if (!cpu_is_omap15xx())
proc_otg_show(s);
tmp = omap_readw(UDC_SYSCON1);
seq_printf(s, "\nsyscon1 %04x" EIGHTBITS "\n", tmp,
(tmp & UDC_CFG_LOCK) ? " cfg_lock" : "",
(tmp & UDC_DATA_ENDIAN) ? " data_endian" : "",
(tmp & UDC_DMA_ENDIAN) ? " dma_endian" : "",
(tmp & UDC_NAK_EN) ? " nak" : "",
(tmp & UDC_AUTODECODE_DIS) ? " autodecode_dis" : "",
(tmp & UDC_SELF_PWR) ? " self_pwr" : "",
(tmp & UDC_SOFF_DIS) ? " soff_dis" : "",
(tmp & UDC_PULLUP_EN) ? " PULLUP" : "");
// syscon2 is write-only
/* UDC controller registers */
if (!(tmp & UDC_PULLUP_EN)) {
seq_printf(s, "(suspended)\n");
spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
tmp = omap_readw(UDC_DEVSTAT);
seq_printf(s, "devstat %04x" EIGHTBITS "%s%s\n", tmp,
(tmp & UDC_B_HNP_ENABLE) ? " b_hnp" : "",
(tmp & UDC_A_HNP_SUPPORT) ? " a_hnp" : "",
(tmp & UDC_A_ALT_HNP_SUPPORT) ? " a_alt_hnp" : "",
(tmp & UDC_R_WK_OK) ? " r_wk_ok" : "",
(tmp & UDC_USB_RESET) ? " usb_reset" : "",
(tmp & UDC_SUS) ? " SUS" : "",
(tmp & UDC_CFG) ? " CFG" : "",
(tmp & UDC_ADD) ? " ADD" : "",
(tmp & UDC_DEF) ? " DEF" : "",
(tmp & UDC_ATT) ? " ATT" : "");
seq_printf(s, "sof %04x\n", omap_readw(UDC_SOF));
tmp = omap_readw(UDC_IRQ_EN);
seq_printf(s, "irq_en %04x" FOURBITS "%s\n", tmp,
(tmp & UDC_SOF_IE) ? " sof" : "",
(tmp & UDC_EPN_RX_IE) ? " epn_rx" : "",
(tmp & UDC_EPN_TX_IE) ? " epn_tx" : "",
(tmp & UDC_DS_CHG_IE) ? " ds_chg" : "",
(tmp & UDC_EP0_IE) ? " ep0" : "");
tmp = omap_readw(UDC_IRQ_SRC);
seq_printf(s, "irq_src %04x" EIGHTBITS "%s%s\n", tmp,
(tmp & UDC_TXN_DONE) ? " txn_done" : "",
(tmp & UDC_RXN_CNT) ? " rxn_cnt" : "",
(tmp & UDC_RXN_EOT) ? " rxn_eot" : "",
(tmp & UDC_IRQ_SOF) ? " sof" : "",
(tmp & UDC_EPN_RX) ? " epn_rx" : "",
(tmp & UDC_EPN_TX) ? " epn_tx" : "",
(tmp & UDC_DS_CHG) ? " ds_chg" : "",
(tmp & UDC_SETUP) ? " setup" : "",
(tmp & UDC_EP0_RX) ? " ep0out" : "",
(tmp & UDC_EP0_TX) ? " ep0in" : "");
if (use_dma) {
unsigned i;
tmp = omap_readw(UDC_DMA_IRQ_EN);
seq_printf(s, "dma_irq_en %04x%s" EIGHTBITS "\n", tmp,
(tmp & UDC_TX_DONE_IE(3)) ? " tx2_done" : "",
(tmp & UDC_RX_CNT_IE(3)) ? " rx2_cnt" : "",
(tmp & UDC_RX_EOT_IE(3)) ? " rx2_eot" : "",
(tmp & UDC_TX_DONE_IE(2)) ? " tx1_done" : "",
(tmp & UDC_RX_CNT_IE(2)) ? " rx1_cnt" : "",
(tmp & UDC_RX_EOT_IE(2)) ? " rx1_eot" : "",
(tmp & UDC_TX_DONE_IE(1)) ? " tx0_done" : "",
(tmp & UDC_RX_CNT_IE(1)) ? " rx0_cnt" : "",
(tmp & UDC_RX_EOT_IE(1)) ? " rx0_eot" : "");
tmp = omap_readw(UDC_RXDMA_CFG);
seq_printf(s, "rxdma_cfg %04x\n", tmp);
if (tmp) {
for (i = 0; i < 3; i++) {
if ((tmp & (0x0f << (i * 4))) == 0)
continue;
seq_printf(s, "rxdma[%d] %04x\n", i,
omap_readw(UDC_RXDMA(i + 1)));
}
}
tmp = omap_readw(UDC_TXDMA_CFG);
seq_printf(s, "txdma_cfg %04x\n", tmp);
if (tmp) {
for (i = 0; i < 3; i++) {
if (!(tmp & (0x0f << (i * 4))))
continue;
seq_printf(s, "txdma[%d] %04x\n", i,
omap_readw(UDC_TXDMA(i + 1)));
}
}
}
tmp = omap_readw(UDC_DEVSTAT);
if (tmp & UDC_ATT) {
proc_ep_show(s, &udc->ep[0]);
if (tmp & UDC_ADD) {
list_for_each_entry (ep, &udc->gadget.ep_list,
ep.ep_list) {
if (ep->desc)
proc_ep_show(s, ep);
}
}
}
spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
static int proc_udc_open(struct inode *inode, struct file *file)
{
return single_open(file, proc_udc_show, NULL);
}
static const struct file_operations proc_ops = {
.owner = THIS_MODULE,
.open = proc_udc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void create_proc_file(void)
{
proc_create(proc_filename, 0, NULL, &proc_ops);
}
static void remove_proc_file(void)
{
remove_proc_entry(proc_filename, NULL);
}
#else
static inline void create_proc_file(void) {}
static inline void remove_proc_file(void) {}
#endif
/*-------------------------------------------------------------------------*/
/* Before this controller can enumerate, we need to pick an endpoint
* configuration, or "fifo_mode" That involves allocating 2KB of packet
* buffer space among the endpoints we'll be operating.
*
* NOTE: as of OMAP 1710 ES2.0, writing a new endpoint config when
* UDC_SYSCON_1.CFG_LOCK is set can now work. We won't use that
* capability yet though.
*/
static unsigned __init
omap_ep_setup(char *name, u8 addr, u8 type,
unsigned buf, unsigned maxp, int dbuf)
{
struct omap_ep *ep;
u16 epn_rxtx = 0;
/* OUT endpoints first, then IN */
ep = &udc->ep[addr & 0xf];
if (addr & USB_DIR_IN)
ep += 16;
/* in case of ep init table bugs */
BUG_ON(ep->name[0]);
/* chip setup ... bit values are same for IN, OUT */
if (type == USB_ENDPOINT_XFER_ISOC) {
switch (maxp) {
case 8: epn_rxtx = 0 << 12; break;
case 16: epn_rxtx = 1 << 12; break;
case 32: epn_rxtx = 2 << 12; break;
case 64: epn_rxtx = 3 << 12; break;
case 128: epn_rxtx = 4 << 12; break;
case 256: epn_rxtx = 5 << 12; break;
case 512: epn_rxtx = 6 << 12; break;
default: BUG();
}
epn_rxtx |= UDC_EPN_RX_ISO;
dbuf = 1;
} else {
/* double-buffering "not supported" on 15xx,
* and ignored for PIO-IN on newer chips
* (for more reliable behavior)
*/
if (!use_dma || cpu_is_omap15xx() || cpu_is_omap24xx())
dbuf = 0;
switch (maxp) {
case 8: epn_rxtx = 0 << 12; break;
case 16: epn_rxtx = 1 << 12; break;
case 32: epn_rxtx = 2 << 12; break;
case 64: epn_rxtx = 3 << 12; break;
default: BUG();
}
if (dbuf && addr)
epn_rxtx |= UDC_EPN_RX_DB;
init_timer(&ep->timer);
ep->timer.function = pio_out_timer;
ep->timer.data = (unsigned long) ep;
}
if (addr)
epn_rxtx |= UDC_EPN_RX_VALID;
BUG_ON(buf & 0x07);
epn_rxtx |= buf >> 3;
DBG("%s addr %02x rxtx %04x maxp %d%s buf %d\n",
name, addr, epn_rxtx, maxp, dbuf ? "x2" : "", buf);
if (addr & USB_DIR_IN)
omap_writew(epn_rxtx, UDC_EP_TX(addr & 0xf));
else
omap_writew(epn_rxtx, UDC_EP_RX(addr));
/* next endpoint's buffer starts after this one's */
buf += maxp;
if (dbuf)
buf += maxp;
BUG_ON(buf > 2048);
/* set up driver data structures */
BUG_ON(strlen(name) >= sizeof ep->name);
strlcpy(ep->name, name, sizeof ep->name);
INIT_LIST_HEAD(&ep->queue);
INIT_LIST_HEAD(&ep->iso);
ep->bEndpointAddress = addr;
ep->bmAttributes = type;
ep->double_buf = dbuf;
ep->udc = udc;
ep->ep.name = ep->name;
ep->ep.ops = &omap_ep_ops;
ep->ep.maxpacket = ep->maxpacket = maxp;
list_add_tail (&ep->ep.ep_list, &udc->gadget.ep_list);
return buf;
}
static void omap_udc_release(struct device *dev)
{
complete(udc->done);
kfree (udc);
udc = NULL;
}
static int __init
omap_udc_setup(struct platform_device *odev, struct otg_transceiver *xceiv)
{
unsigned tmp, buf;
/* abolish any previous hardware state */
omap_writew(0, UDC_SYSCON1);
omap_writew(0, UDC_IRQ_EN);
omap_writew(UDC_IRQ_SRC_MASK, UDC_IRQ_SRC);
omap_writew(0, UDC_DMA_IRQ_EN);
omap_writew(0, UDC_RXDMA_CFG);
omap_writew(0, UDC_TXDMA_CFG);
/* UDC_PULLUP_EN gates the chip clock */
// OTG_SYSCON_1 |= DEV_IDLE_EN;
udc = kzalloc(sizeof(*udc), GFP_KERNEL);
if (!udc)
return -ENOMEM;
spin_lock_init (&udc->lock);
udc->gadget.ops = &omap_gadget_ops;
udc->gadget.ep0 = &udc->ep[0].ep;
INIT_LIST_HEAD(&udc->gadget.ep_list);
INIT_LIST_HEAD(&udc->iso);
udc->gadget.speed = USB_SPEED_UNKNOWN;
udc->gadget.name = driver_name;
device_initialize(&udc->gadget.dev);
dev_set_name(&udc->gadget.dev, "gadget");
udc->gadget.dev.release = omap_udc_release;
udc->gadget.dev.parent = &odev->dev;
if (use_dma)
udc->gadget.dev.dma_mask = odev->dev.dma_mask;
udc->transceiver = xceiv;
/* ep0 is special; put it right after the SETUP buffer */
buf = omap_ep_setup("ep0", 0, USB_ENDPOINT_XFER_CONTROL,
8 /* after SETUP */, 64 /* maxpacket */, 0);
list_del_init(&udc->ep[0].ep.ep_list);
/* initially disable all non-ep0 endpoints */
for (tmp = 1; tmp < 15; tmp++) {
omap_writew(0, UDC_EP_RX(tmp));
omap_writew(0, UDC_EP_TX(tmp));
}
#define OMAP_BULK_EP(name,addr) \
buf = omap_ep_setup(name "-bulk", addr, \
USB_ENDPOINT_XFER_BULK, buf, 64, 1);
#define OMAP_INT_EP(name,addr, maxp) \
buf = omap_ep_setup(name "-int", addr, \
USB_ENDPOINT_XFER_INT, buf, maxp, 0);
#define OMAP_ISO_EP(name,addr, maxp) \
buf = omap_ep_setup(name "-iso", addr, \
USB_ENDPOINT_XFER_ISOC, buf, maxp, 1);
switch (fifo_mode) {
case 0:
OMAP_BULK_EP("ep1in", USB_DIR_IN | 1);
OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2);
OMAP_INT_EP("ep3in", USB_DIR_IN | 3, 16);
break;
case 1:
OMAP_BULK_EP("ep1in", USB_DIR_IN | 1);
OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2);
OMAP_INT_EP("ep9in", USB_DIR_IN | 9, 16);
OMAP_BULK_EP("ep3in", USB_DIR_IN | 3);
OMAP_BULK_EP("ep4out", USB_DIR_OUT | 4);
OMAP_INT_EP("ep10in", USB_DIR_IN | 10, 16);
OMAP_BULK_EP("ep5in", USB_DIR_IN | 5);
OMAP_BULK_EP("ep5out", USB_DIR_OUT | 5);
OMAP_INT_EP("ep11in", USB_DIR_IN | 11, 16);
OMAP_BULK_EP("ep6in", USB_DIR_IN | 6);
OMAP_BULK_EP("ep6out", USB_DIR_OUT | 6);
OMAP_INT_EP("ep12in", USB_DIR_IN | 12, 16);
OMAP_BULK_EP("ep7in", USB_DIR_IN | 7);
OMAP_BULK_EP("ep7out", USB_DIR_OUT | 7);
OMAP_INT_EP("ep13in", USB_DIR_IN | 13, 16);
OMAP_INT_EP("ep13out", USB_DIR_OUT | 13, 16);
OMAP_BULK_EP("ep8in", USB_DIR_IN | 8);
OMAP_BULK_EP("ep8out", USB_DIR_OUT | 8);
OMAP_INT_EP("ep14in", USB_DIR_IN | 14, 16);
OMAP_INT_EP("ep14out", USB_DIR_OUT | 14, 16);
OMAP_BULK_EP("ep15in", USB_DIR_IN | 15);
OMAP_BULK_EP("ep15out", USB_DIR_OUT | 15);
break;
#ifdef USE_ISO
case 2: /* mixed iso/bulk */
OMAP_ISO_EP("ep1in", USB_DIR_IN | 1, 256);
OMAP_ISO_EP("ep2out", USB_DIR_OUT | 2, 256);
OMAP_ISO_EP("ep3in", USB_DIR_IN | 3, 128);
OMAP_ISO_EP("ep4out", USB_DIR_OUT | 4, 128);
OMAP_INT_EP("ep5in", USB_DIR_IN | 5, 16);
OMAP_BULK_EP("ep6in", USB_DIR_IN | 6);
OMAP_BULK_EP("ep7out", USB_DIR_OUT | 7);
OMAP_INT_EP("ep8in", USB_DIR_IN | 8, 16);
break;
case 3: /* mixed bulk/iso */
OMAP_BULK_EP("ep1in", USB_DIR_IN | 1);
OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2);
OMAP_INT_EP("ep3in", USB_DIR_IN | 3, 16);
OMAP_BULK_EP("ep4in", USB_DIR_IN | 4);
OMAP_BULK_EP("ep5out", USB_DIR_OUT | 5);
OMAP_INT_EP("ep6in", USB_DIR_IN | 6, 16);
OMAP_ISO_EP("ep7in", USB_DIR_IN | 7, 256);
OMAP_ISO_EP("ep8out", USB_DIR_OUT | 8, 256);
OMAP_INT_EP("ep9in", USB_DIR_IN | 9, 16);
break;
#endif
/* add more modes as needed */
default:
ERR("unsupported fifo_mode #%d\n", fifo_mode);
return -ENODEV;
}
omap_writew(UDC_CFG_LOCK|UDC_SELF_PWR, UDC_SYSCON1);
INFO("fifo mode %d, %d bytes not used\n", fifo_mode, 2048 - buf);
return 0;
}
static int __init omap_udc_probe(struct platform_device *pdev)
{
int status = -ENODEV;
int hmc;
struct otg_transceiver *xceiv = NULL;
const char *type = NULL;
struct omap_usb_config *config = pdev->dev.platform_data;
struct clk *dc_clk;
struct clk *hhc_clk;
/* NOTE: "knows" the order of the resources! */
if (!request_mem_region(pdev->resource[0].start,
pdev->resource[0].end - pdev->resource[0].start + 1,
driver_name)) {
DBG("request_mem_region failed\n");
return -EBUSY;
}
if (cpu_is_omap16xx()) {
dc_clk = clk_get(&pdev->dev, "usb_dc_ck");
hhc_clk = clk_get(&pdev->dev, "usb_hhc_ck");
BUG_ON(IS_ERR(dc_clk) || IS_ERR(hhc_clk));
/* can't use omap_udc_enable_clock yet */
clk_enable(dc_clk);
clk_enable(hhc_clk);
udelay(100);
}
if (cpu_is_omap24xx()) {
dc_clk = clk_get(&pdev->dev, "usb_fck");
hhc_clk = clk_get(&pdev->dev, "usb_l4_ick");
BUG_ON(IS_ERR(dc_clk) || IS_ERR(hhc_clk));
/* can't use omap_udc_enable_clock yet */
clk_enable(dc_clk);
clk_enable(hhc_clk);
udelay(100);
}
if (cpu_is_omap7xx()) {
dc_clk = clk_get(&pdev->dev, "usb_dc_ck");
hhc_clk = clk_get(&pdev->dev, "l3_ocpi_ck");
BUG_ON(IS_ERR(dc_clk) || IS_ERR(hhc_clk));
/* can't use omap_udc_enable_clock yet */
clk_enable(dc_clk);
clk_enable(hhc_clk);
udelay(100);
}
INFO("OMAP UDC rev %d.%d%s\n",
omap_readw(UDC_REV) >> 4, omap_readw(UDC_REV) & 0xf,
config->otg ? ", Mini-AB" : "");
/* use the mode given to us by board init code */
if (cpu_is_omap15xx()) {
hmc = HMC_1510;
type = "(unknown)";
if (machine_without_vbus_sense()) {
/* just set up software VBUS detect, and then
* later rig it so we always report VBUS.
* FIXME without really sensing VBUS, we can't
* know when to turn PULLUP_EN on/off; and that
* means we always "need" the 48MHz clock.
*/
u32 tmp = omap_readl(FUNC_MUX_CTRL_0);
tmp &= ~VBUS_CTRL_1510;
omap_writel(tmp, FUNC_MUX_CTRL_0);
tmp |= VBUS_MODE_1510;
tmp &= ~VBUS_CTRL_1510;
omap_writel(tmp, FUNC_MUX_CTRL_0);
}
} else {
/* The transceiver may package some GPIO logic or handle
* loopback and/or transceiverless setup; if we find one,
* use it. Except for OTG, we don't _need_ to talk to one;
* but not having one probably means no VBUS detection.
*/
xceiv = otg_get_transceiver();
if (xceiv)
type = xceiv->label;
else if (config->otg) {
DBG("OTG requires external transceiver!\n");
goto cleanup0;
}
hmc = HMC_1610;
if (cpu_is_omap24xx()) {
/* this could be transceiverless in one of the
* "we don't need to know" modes.
*/
type = "external";
goto known;
}
switch (hmc) {
case 0: /* POWERUP DEFAULT == 0 */
case 4:
case 12:
case 20:
if (!cpu_is_omap1710()) {
type = "integrated";
break;
}
/* FALL THROUGH */
case 3:
case 11:
case 16:
case 19:
case 25:
if (!xceiv) {
DBG("external transceiver not registered!\n");
type = "unknown";
}
break;
case 21: /* internal loopback */
type = "loopback";
break;
case 14: /* transceiverless */
if (cpu_is_omap1710())
goto bad_on_1710;
/* FALL THROUGH */
case 13:
case 15:
type = "no";
break;
default:
bad_on_1710:
ERR("unrecognized UDC HMC mode %d\n", hmc);
goto cleanup0;
}
}
known:
INFO("hmc mode %d, %s transceiver\n", hmc, type);
/* a "gadget" abstracts/virtualizes the controller */
status = omap_udc_setup(pdev, xceiv);
if (status) {
goto cleanup0;
}
xceiv = NULL;
// "udc" is now valid
pullup_disable(udc);
#if defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)
udc->gadget.is_otg = (config->otg != 0);
#endif
/* starting with omap1710 es2.0, clear toggle is a separate bit */
if (omap_readw(UDC_REV) >= 0x61)
udc->clr_halt = UDC_RESET_EP | UDC_CLRDATA_TOGGLE;
else
udc->clr_halt = UDC_RESET_EP;
/* USB general purpose IRQ: ep0, state changes, dma, etc */
status = request_irq(pdev->resource[1].start, omap_udc_irq,
IRQF_SAMPLE_RANDOM, driver_name, udc);
if (status != 0) {
ERR("can't get irq %d, err %d\n",
(int) pdev->resource[1].start, status);
goto cleanup1;
}
/* USB "non-iso" IRQ (PIO for all but ep0) */
status = request_irq(pdev->resource[2].start, omap_udc_pio_irq,
IRQF_SAMPLE_RANDOM, "omap_udc pio", udc);
if (status != 0) {
ERR("can't get irq %d, err %d\n",
(int) pdev->resource[2].start, status);
goto cleanup2;
}
#ifdef USE_ISO
status = request_irq(pdev->resource[3].start, omap_udc_iso_irq,
IRQF_DISABLED, "omap_udc iso", udc);
if (status != 0) {
ERR("can't get irq %d, err %d\n",
(int) pdev->resource[3].start, status);
goto cleanup3;
}
#endif
if (cpu_is_omap16xx() || cpu_is_omap7xx()) {
udc->dc_clk = dc_clk;
udc->hhc_clk = hhc_clk;
clk_disable(hhc_clk);
clk_disable(dc_clk);
}
if (cpu_is_omap24xx()) {
udc->dc_clk = dc_clk;
udc->hhc_clk = hhc_clk;
/* FIXME OMAP2 don't release hhc & dc clock */
#if 0
clk_disable(hhc_clk);
clk_disable(dc_clk);
#endif
}
create_proc_file();
status = device_add(&udc->gadget.dev);
if (!status)
return status;
/* If fail, fall through */
#ifdef USE_ISO
cleanup3:
free_irq(pdev->resource[2].start, udc);
#endif
cleanup2:
free_irq(pdev->resource[1].start, udc);
cleanup1:
kfree (udc);
udc = NULL;
cleanup0:
if (xceiv)
otg_put_transceiver(xceiv);
if (cpu_is_omap16xx() || cpu_is_omap24xx() || cpu_is_omap7xx()) {
clk_disable(hhc_clk);
clk_disable(dc_clk);
clk_put(hhc_clk);
clk_put(dc_clk);
}
release_mem_region(pdev->resource[0].start,
pdev->resource[0].end - pdev->resource[0].start + 1);
return status;
}
static int __exit omap_udc_remove(struct platform_device *pdev)
{
DECLARE_COMPLETION_ONSTACK(done);
if (!udc)
return -ENODEV;
if (udc->driver)
return -EBUSY;
udc->done = &done;
pullup_disable(udc);
if (udc->transceiver) {
otg_put_transceiver(udc->transceiver);
udc->transceiver = NULL;
}
omap_writew(0, UDC_SYSCON1);
remove_proc_file();
#ifdef USE_ISO
free_irq(pdev->resource[3].start, udc);
#endif
free_irq(pdev->resource[2].start, udc);
free_irq(pdev->resource[1].start, udc);
if (udc->dc_clk) {
if (udc->clk_requested)
omap_udc_enable_clock(0);
clk_put(udc->hhc_clk);
clk_put(udc->dc_clk);
}
release_mem_region(pdev->resource[0].start,
pdev->resource[0].end - pdev->resource[0].start + 1);
device_unregister(&udc->gadget.dev);
wait_for_completion(&done);
return 0;
}
/* suspend/resume/wakeup from sysfs (echo > power/state) or when the
* system is forced into deep sleep
*
* REVISIT we should probably reject suspend requests when there's a host
* session active, rather than disconnecting, at least on boards that can
* report VBUS irqs (UDC_DEVSTAT.UDC_ATT). And in any case, we need to
* make host resumes and VBUS detection trigger OMAP wakeup events; that
* may involve talking to an external transceiver (e.g. isp1301).
*/
static int omap_udc_suspend(struct platform_device *dev, pm_message_t message)
{
u32 devstat;
devstat = omap_readw(UDC_DEVSTAT);
/* we're requesting 48 MHz clock if the pullup is enabled
* (== we're attached to the host) and we're not suspended,
* which would prevent entry to deep sleep...
*/
if ((devstat & UDC_ATT) != 0 && (devstat & UDC_SUS) == 0) {
WARNING("session active; suspend requires disconnect\n");
omap_pullup(&udc->gadget, 0);
}
return 0;
}
static int omap_udc_resume(struct platform_device *dev)
{
DBG("resume + wakeup/SRP\n");
omap_pullup(&udc->gadget, 1);
/* maybe the host would enumerate us if we nudged it */
msleep(100);
return omap_wakeup(&udc->gadget);
}
/*-------------------------------------------------------------------------*/
static struct platform_driver udc_driver = {
.remove = __exit_p(omap_udc_remove),
.suspend = omap_udc_suspend,
.resume = omap_udc_resume,
.driver = {
.owner = THIS_MODULE,
.name = (char *) driver_name,
},
};
static int __init udc_init(void)
{
/* Disable DMA for omap7xx -- it doesn't work right. */
if (cpu_is_omap7xx())
use_dma = 0;
INFO("%s, version: " DRIVER_VERSION
#ifdef USE_ISO
" (iso)"
#endif
"%s\n", driver_desc,
use_dma ? " (dma)" : "");
return platform_driver_probe(&udc_driver, omap_udc_probe);
}
module_init(udc_init);
static void __exit udc_exit(void)
{
platform_driver_unregister(&udc_driver);
}
module_exit(udc_exit);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:omap_udc");
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