linux/drivers/usb/gadget/pxa27x_udc.c
Robert Baldyga e117e742d3 usb: gadget: add "maxpacket_limit" field to struct usb_ep
This patch adds "maxpacket_limit" to struct usb_ep. This field contains
maximum value of maxpacket supported by driver, and is set in driver probe.
This value should be used by autoconfig() function, because value of field
"maxpacket" is set to value from endpoint descriptor when endpoint becomes
enabled. So when autoconfig() function will be called again for this endpoint,
"maxpacket" value will contain wMaxPacketSize from descriptior instead of
maximum packet size for this endpoint.

For this reason this patch adds new field "maxpacket_limit" which contains
value of maximum packet size (which defines maximum endpoint capabilities).
This value is used in ep_matches() function used by autoconfig().

Value of "maxpacket_limit" should be set in UDC driver probe function, using
usb_ep_set_maxpacket_limit() function, defined in gadget.h. This function
set choosen value to both "maxpacket_limit" and "maxpacket" fields.

This patch modifies UDC drivers by adding support for maxpacket_limit.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-12-17 13:17:41 -06:00

2627 lines
67 KiB
C

/*
* Handles the Intel 27x USB Device Controller (UDC)
*
* Inspired by original driver by Frank Becker, David Brownell, and others.
* Copyright (C) 2008 Robert Jarzmik
*
* 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.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/clk.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/prefetch.h>
#include <linux/byteorder/generic.h>
#include <linux/platform_data/pxa2xx_udc.h>
#include <linux/usb.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include "pxa27x_udc.h"
/*
* This driver handles the USB Device Controller (UDC) in Intel's PXA 27x
* series processors.
*
* Such controller drivers work with a gadget driver. The gadget driver
* returns descriptors, implements configuration and data protocols used
* by the host to interact with this device, and allocates endpoints to
* the different protocol interfaces. The controller driver virtualizes
* usb hardware so that the gadget drivers will be more portable.
*
* This UDC hardware wants to implement a bit too much USB protocol. The
* biggest issues are: that the endpoints have to be set up before the
* controller can be enabled (minor, and not uncommon); and each endpoint
* can only have one configuration, interface and alternative interface
* number (major, and very unusual). Once set up, these cannot be changed
* without a controller reset.
*
* The workaround is to setup all combinations necessary for the gadgets which
* will work with this driver. This is done in pxa_udc structure, statically.
* See pxa_udc, udc_usb_ep versus pxa_ep, and matching function find_pxa_ep.
* (You could modify this if needed. Some drivers have a "fifo_mode" module
* parameter to facilitate such changes.)
*
* The combinations have been tested with these gadgets :
* - zero gadget
* - file storage gadget
* - ether gadget
*
* The driver doesn't use DMA, only IO access and IRQ callbacks. No use is
* made of UDC's double buffering either. USB "On-The-Go" is not implemented.
*
* All the requests are handled the same way :
* - the drivers tries to handle the request directly to the IO
* - if the IO fifo is not big enough, the remaining is send/received in
* interrupt handling.
*/
#define DRIVER_VERSION "2008-04-18"
#define DRIVER_DESC "PXA 27x USB Device Controller driver"
static const char driver_name[] = "pxa27x_udc";
static struct pxa_udc *the_controller;
static void handle_ep(struct pxa_ep *ep);
/*
* Debug filesystem
*/
#ifdef CONFIG_USB_GADGET_DEBUG_FS
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/seq_file.h>
static int state_dbg_show(struct seq_file *s, void *p)
{
struct pxa_udc *udc = s->private;
int pos = 0, ret;
u32 tmp;
ret = -ENODEV;
if (!udc->driver)
goto out;
/* basic device status */
pos += seq_printf(s, DRIVER_DESC "\n"
"%s version: %s\nGadget driver: %s\n",
driver_name, DRIVER_VERSION,
udc->driver ? udc->driver->driver.name : "(none)");
tmp = udc_readl(udc, UDCCR);
pos += seq_printf(s,
"udccr=0x%0x(%s%s%s%s%s%s%s%s%s%s), "
"con=%d,inter=%d,altinter=%d\n", tmp,
(tmp & UDCCR_OEN) ? " oen":"",
(tmp & UDCCR_AALTHNP) ? " aalthnp":"",
(tmp & UDCCR_AHNP) ? " rem" : "",
(tmp & UDCCR_BHNP) ? " rstir" : "",
(tmp & UDCCR_DWRE) ? " dwre" : "",
(tmp & UDCCR_SMAC) ? " smac" : "",
(tmp & UDCCR_EMCE) ? " emce" : "",
(tmp & UDCCR_UDR) ? " udr" : "",
(tmp & UDCCR_UDA) ? " uda" : "",
(tmp & UDCCR_UDE) ? " ude" : "",
(tmp & UDCCR_ACN) >> UDCCR_ACN_S,
(tmp & UDCCR_AIN) >> UDCCR_AIN_S,
(tmp & UDCCR_AAISN) >> UDCCR_AAISN_S);
/* registers for device and ep0 */
pos += seq_printf(s, "udcicr0=0x%08x udcicr1=0x%08x\n",
udc_readl(udc, UDCICR0), udc_readl(udc, UDCICR1));
pos += seq_printf(s, "udcisr0=0x%08x udcisr1=0x%08x\n",
udc_readl(udc, UDCISR0), udc_readl(udc, UDCISR1));
pos += seq_printf(s, "udcfnr=%d\n", udc_readl(udc, UDCFNR));
pos += seq_printf(s, "irqs: reset=%lu, suspend=%lu, resume=%lu, "
"reconfig=%lu\n",
udc->stats.irqs_reset, udc->stats.irqs_suspend,
udc->stats.irqs_resume, udc->stats.irqs_reconfig);
ret = 0;
out:
return ret;
}
static int queues_dbg_show(struct seq_file *s, void *p)
{
struct pxa_udc *udc = s->private;
struct pxa_ep *ep;
struct pxa27x_request *req;
int pos = 0, i, maxpkt, ret;
ret = -ENODEV;
if (!udc->driver)
goto out;
/* dump endpoint queues */
for (i = 0; i < NR_PXA_ENDPOINTS; i++) {
ep = &udc->pxa_ep[i];
maxpkt = ep->fifo_size;
pos += seq_printf(s, "%-12s max_pkt=%d %s\n",
EPNAME(ep), maxpkt, "pio");
if (list_empty(&ep->queue)) {
pos += seq_printf(s, "\t(nothing queued)\n");
continue;
}
list_for_each_entry(req, &ep->queue, queue) {
pos += seq_printf(s, "\treq %p len %d/%d buf %p\n",
&req->req, req->req.actual,
req->req.length, req->req.buf);
}
}
ret = 0;
out:
return ret;
}
static int eps_dbg_show(struct seq_file *s, void *p)
{
struct pxa_udc *udc = s->private;
struct pxa_ep *ep;
int pos = 0, i, ret;
u32 tmp;
ret = -ENODEV;
if (!udc->driver)
goto out;
ep = &udc->pxa_ep[0];
tmp = udc_ep_readl(ep, UDCCSR);
pos += seq_printf(s, "udccsr0=0x%03x(%s%s%s%s%s%s%s)\n", tmp,
(tmp & UDCCSR0_SA) ? " sa" : "",
(tmp & UDCCSR0_RNE) ? " rne" : "",
(tmp & UDCCSR0_FST) ? " fst" : "",
(tmp & UDCCSR0_SST) ? " sst" : "",
(tmp & UDCCSR0_DME) ? " dme" : "",
(tmp & UDCCSR0_IPR) ? " ipr" : "",
(tmp & UDCCSR0_OPC) ? " opc" : "");
for (i = 0; i < NR_PXA_ENDPOINTS; i++) {
ep = &udc->pxa_ep[i];
tmp = i? udc_ep_readl(ep, UDCCR) : udc_readl(udc, UDCCR);
pos += seq_printf(s, "%-12s: "
"IN %lu(%lu reqs), OUT %lu(%lu reqs), "
"irqs=%lu, udccr=0x%08x, udccsr=0x%03x, "
"udcbcr=%d\n",
EPNAME(ep),
ep->stats.in_bytes, ep->stats.in_ops,
ep->stats.out_bytes, ep->stats.out_ops,
ep->stats.irqs,
tmp, udc_ep_readl(ep, UDCCSR),
udc_ep_readl(ep, UDCBCR));
}
ret = 0;
out:
return ret;
}
static int eps_dbg_open(struct inode *inode, struct file *file)
{
return single_open(file, eps_dbg_show, inode->i_private);
}
static int queues_dbg_open(struct inode *inode, struct file *file)
{
return single_open(file, queues_dbg_show, inode->i_private);
}
static int state_dbg_open(struct inode *inode, struct file *file)
{
return single_open(file, state_dbg_show, inode->i_private);
}
static const struct file_operations state_dbg_fops = {
.owner = THIS_MODULE,
.open = state_dbg_open,
.llseek = seq_lseek,
.read = seq_read,
.release = single_release,
};
static const struct file_operations queues_dbg_fops = {
.owner = THIS_MODULE,
.open = queues_dbg_open,
.llseek = seq_lseek,
.read = seq_read,
.release = single_release,
};
static const struct file_operations eps_dbg_fops = {
.owner = THIS_MODULE,
.open = eps_dbg_open,
.llseek = seq_lseek,
.read = seq_read,
.release = single_release,
};
static void pxa_init_debugfs(struct pxa_udc *udc)
{
struct dentry *root, *state, *queues, *eps;
root = debugfs_create_dir(udc->gadget.name, NULL);
if (IS_ERR(root) || !root)
goto err_root;
state = debugfs_create_file("udcstate", 0400, root, udc,
&state_dbg_fops);
if (!state)
goto err_state;
queues = debugfs_create_file("queues", 0400, root, udc,
&queues_dbg_fops);
if (!queues)
goto err_queues;
eps = debugfs_create_file("epstate", 0400, root, udc,
&eps_dbg_fops);
if (!eps)
goto err_eps;
udc->debugfs_root = root;
udc->debugfs_state = state;
udc->debugfs_queues = queues;
udc->debugfs_eps = eps;
return;
err_eps:
debugfs_remove(eps);
err_queues:
debugfs_remove(queues);
err_state:
debugfs_remove(root);
err_root:
dev_err(udc->dev, "debugfs is not available\n");
}
static void pxa_cleanup_debugfs(struct pxa_udc *udc)
{
debugfs_remove(udc->debugfs_eps);
debugfs_remove(udc->debugfs_queues);
debugfs_remove(udc->debugfs_state);
debugfs_remove(udc->debugfs_root);
udc->debugfs_eps = NULL;
udc->debugfs_queues = NULL;
udc->debugfs_state = NULL;
udc->debugfs_root = NULL;
}
#else
static inline void pxa_init_debugfs(struct pxa_udc *udc)
{
}
static inline void pxa_cleanup_debugfs(struct pxa_udc *udc)
{
}
#endif
/**
* is_match_usb_pxa - check if usb_ep and pxa_ep match
* @udc_usb_ep: usb endpoint
* @ep: pxa endpoint
* @config: configuration required in pxa_ep
* @interface: interface required in pxa_ep
* @altsetting: altsetting required in pxa_ep
*
* Returns 1 if all criteria match between pxa and usb endpoint, 0 otherwise
*/
static int is_match_usb_pxa(struct udc_usb_ep *udc_usb_ep, struct pxa_ep *ep,
int config, int interface, int altsetting)
{
if (usb_endpoint_num(&udc_usb_ep->desc) != ep->addr)
return 0;
if (usb_endpoint_dir_in(&udc_usb_ep->desc) != ep->dir_in)
return 0;
if (usb_endpoint_type(&udc_usb_ep->desc) != ep->type)
return 0;
if ((ep->config != config) || (ep->interface != interface)
|| (ep->alternate != altsetting))
return 0;
return 1;
}
/**
* find_pxa_ep - find pxa_ep structure matching udc_usb_ep
* @udc: pxa udc
* @udc_usb_ep: udc_usb_ep structure
*
* Match udc_usb_ep and all pxa_ep available, to see if one matches.
* This is necessary because of the strong pxa hardware restriction requiring
* that once pxa endpoints are initialized, their configuration is freezed, and
* no change can be made to their address, direction, or in which configuration,
* interface or altsetting they are active ... which differs from more usual
* models which have endpoints be roughly just addressable fifos, and leave
* configuration events up to gadget drivers (like all control messages).
*
* Note that there is still a blurred point here :
* - we rely on UDCCR register "active interface" and "active altsetting".
* This is a nonsense in regard of USB spec, where multiple interfaces are
* active at the same time.
* - if we knew for sure that the pxa can handle multiple interface at the
* same time, assuming Intel's Developer Guide is wrong, this function
* should be reviewed, and a cache of couples (iface, altsetting) should
* be kept in the pxa_udc structure. In this case this function would match
* against the cache of couples instead of the "last altsetting" set up.
*
* Returns the matched pxa_ep structure or NULL if none found
*/
static struct pxa_ep *find_pxa_ep(struct pxa_udc *udc,
struct udc_usb_ep *udc_usb_ep)
{
int i;
struct pxa_ep *ep;
int cfg = udc->config;
int iface = udc->last_interface;
int alt = udc->last_alternate;
if (udc_usb_ep == &udc->udc_usb_ep[0])
return &udc->pxa_ep[0];
for (i = 1; i < NR_PXA_ENDPOINTS; i++) {
ep = &udc->pxa_ep[i];
if (is_match_usb_pxa(udc_usb_ep, ep, cfg, iface, alt))
return ep;
}
return NULL;
}
/**
* update_pxa_ep_matches - update pxa_ep cached values in all udc_usb_ep
* @udc: pxa udc
*
* Context: in_interrupt()
*
* Updates all pxa_ep fields in udc_usb_ep structures, if this field was
* previously set up (and is not NULL). The update is necessary is a
* configuration change or altsetting change was issued by the USB host.
*/
static void update_pxa_ep_matches(struct pxa_udc *udc)
{
int i;
struct udc_usb_ep *udc_usb_ep;
for (i = 1; i < NR_USB_ENDPOINTS; i++) {
udc_usb_ep = &udc->udc_usb_ep[i];
if (udc_usb_ep->pxa_ep)
udc_usb_ep->pxa_ep = find_pxa_ep(udc, udc_usb_ep);
}
}
/**
* pio_irq_enable - Enables irq generation for one endpoint
* @ep: udc endpoint
*/
static void pio_irq_enable(struct pxa_ep *ep)
{
struct pxa_udc *udc = ep->dev;
int index = EPIDX(ep);
u32 udcicr0 = udc_readl(udc, UDCICR0);
u32 udcicr1 = udc_readl(udc, UDCICR1);
if (index < 16)
udc_writel(udc, UDCICR0, udcicr0 | (3 << (index * 2)));
else
udc_writel(udc, UDCICR1, udcicr1 | (3 << ((index - 16) * 2)));
}
/**
* pio_irq_disable - Disables irq generation for one endpoint
* @ep: udc endpoint
*/
static void pio_irq_disable(struct pxa_ep *ep)
{
struct pxa_udc *udc = ep->dev;
int index = EPIDX(ep);
u32 udcicr0 = udc_readl(udc, UDCICR0);
u32 udcicr1 = udc_readl(udc, UDCICR1);
if (index < 16)
udc_writel(udc, UDCICR0, udcicr0 & ~(3 << (index * 2)));
else
udc_writel(udc, UDCICR1, udcicr1 & ~(3 << ((index - 16) * 2)));
}
/**
* udc_set_mask_UDCCR - set bits in UDCCR
* @udc: udc device
* @mask: bits to set in UDCCR
*
* Sets bits in UDCCR, leaving DME and FST bits as they were.
*/
static inline void udc_set_mask_UDCCR(struct pxa_udc *udc, int mask)
{
u32 udccr = udc_readl(udc, UDCCR);
udc_writel(udc, UDCCR,
(udccr & UDCCR_MASK_BITS) | (mask & UDCCR_MASK_BITS));
}
/**
* udc_clear_mask_UDCCR - clears bits in UDCCR
* @udc: udc device
* @mask: bit to clear in UDCCR
*
* Clears bits in UDCCR, leaving DME and FST bits as they were.
*/
static inline void udc_clear_mask_UDCCR(struct pxa_udc *udc, int mask)
{
u32 udccr = udc_readl(udc, UDCCR);
udc_writel(udc, UDCCR,
(udccr & UDCCR_MASK_BITS) & ~(mask & UDCCR_MASK_BITS));
}
/**
* ep_write_UDCCSR - set bits in UDCCSR
* @udc: udc device
* @mask: bits to set in UDCCR
*
* Sets bits in UDCCSR (UDCCSR0 and UDCCSR*).
*
* A specific case is applied to ep0 : the ACM bit is always set to 1, for
* SET_INTERFACE and SET_CONFIGURATION.
*/
static inline void ep_write_UDCCSR(struct pxa_ep *ep, int mask)
{
if (is_ep0(ep))
mask |= UDCCSR0_ACM;
udc_ep_writel(ep, UDCCSR, mask);
}
/**
* ep_count_bytes_remain - get how many bytes in udc endpoint
* @ep: udc endpoint
*
* Returns number of bytes in OUT fifos. Broken for IN fifos (-EOPNOTSUPP)
*/
static int ep_count_bytes_remain(struct pxa_ep *ep)
{
if (ep->dir_in)
return -EOPNOTSUPP;
return udc_ep_readl(ep, UDCBCR) & 0x3ff;
}
/**
* ep_is_empty - checks if ep has byte ready for reading
* @ep: udc endpoint
*
* If endpoint is the control endpoint, checks if there are bytes in the
* control endpoint fifo. If endpoint is a data endpoint, checks if bytes
* are ready for reading on OUT endpoint.
*
* Returns 0 if ep not empty, 1 if ep empty, -EOPNOTSUPP if IN endpoint
*/
static int ep_is_empty(struct pxa_ep *ep)
{
int ret;
if (!is_ep0(ep) && ep->dir_in)
return -EOPNOTSUPP;
if (is_ep0(ep))
ret = !(udc_ep_readl(ep, UDCCSR) & UDCCSR0_RNE);
else
ret = !(udc_ep_readl(ep, UDCCSR) & UDCCSR_BNE);
return ret;
}
/**
* ep_is_full - checks if ep has place to write bytes
* @ep: udc endpoint
*
* If endpoint is not the control endpoint and is an IN endpoint, checks if
* there is place to write bytes into the endpoint.
*
* Returns 0 if ep not full, 1 if ep full, -EOPNOTSUPP if OUT endpoint
*/
static int ep_is_full(struct pxa_ep *ep)
{
if (is_ep0(ep))
return (udc_ep_readl(ep, UDCCSR) & UDCCSR0_IPR);
if (!ep->dir_in)
return -EOPNOTSUPP;
return (!(udc_ep_readl(ep, UDCCSR) & UDCCSR_BNF));
}
/**
* epout_has_pkt - checks if OUT endpoint fifo has a packet available
* @ep: pxa endpoint
*
* Returns 1 if a complete packet is available, 0 if not, -EOPNOTSUPP for IN ep.
*/
static int epout_has_pkt(struct pxa_ep *ep)
{
if (!is_ep0(ep) && ep->dir_in)
return -EOPNOTSUPP;
if (is_ep0(ep))
return (udc_ep_readl(ep, UDCCSR) & UDCCSR0_OPC);
return (udc_ep_readl(ep, UDCCSR) & UDCCSR_PC);
}
/**
* set_ep0state - Set ep0 automata state
* @dev: udc device
* @state: state
*/
static void set_ep0state(struct pxa_udc *udc, int state)
{
struct pxa_ep *ep = &udc->pxa_ep[0];
char *old_stname = EP0_STNAME(udc);
udc->ep0state = state;
ep_dbg(ep, "state=%s->%s, udccsr0=0x%03x, udcbcr=%d\n", old_stname,
EP0_STNAME(udc), udc_ep_readl(ep, UDCCSR),
udc_ep_readl(ep, UDCBCR));
}
/**
* ep0_idle - Put control endpoint into idle state
* @dev: udc device
*/
static void ep0_idle(struct pxa_udc *dev)
{
set_ep0state(dev, WAIT_FOR_SETUP);
}
/**
* inc_ep_stats_reqs - Update ep stats counts
* @ep: physical endpoint
* @req: usb request
* @is_in: ep direction (USB_DIR_IN or 0)
*
*/
static void inc_ep_stats_reqs(struct pxa_ep *ep, int is_in)
{
if (is_in)
ep->stats.in_ops++;
else
ep->stats.out_ops++;
}
/**
* inc_ep_stats_bytes - Update ep stats counts
* @ep: physical endpoint
* @count: bytes transferred on endpoint
* @is_in: ep direction (USB_DIR_IN or 0)
*/
static void inc_ep_stats_bytes(struct pxa_ep *ep, int count, int is_in)
{
if (is_in)
ep->stats.in_bytes += count;
else
ep->stats.out_bytes += count;
}
/**
* pxa_ep_setup - Sets up an usb physical endpoint
* @ep: pxa27x physical endpoint
*
* Find the physical pxa27x ep, and setup its UDCCR
*/
static void pxa_ep_setup(struct pxa_ep *ep)
{
u32 new_udccr;
new_udccr = ((ep->config << UDCCONR_CN_S) & UDCCONR_CN)
| ((ep->interface << UDCCONR_IN_S) & UDCCONR_IN)
| ((ep->alternate << UDCCONR_AISN_S) & UDCCONR_AISN)
| ((EPADDR(ep) << UDCCONR_EN_S) & UDCCONR_EN)
| ((EPXFERTYPE(ep) << UDCCONR_ET_S) & UDCCONR_ET)
| ((ep->dir_in) ? UDCCONR_ED : 0)
| ((ep->fifo_size << UDCCONR_MPS_S) & UDCCONR_MPS)
| UDCCONR_EE;
udc_ep_writel(ep, UDCCR, new_udccr);
}
/**
* pxa_eps_setup - Sets up all usb physical endpoints
* @dev: udc device
*
* Setup all pxa physical endpoints, except ep0
*/
static void pxa_eps_setup(struct pxa_udc *dev)
{
unsigned int i;
dev_dbg(dev->dev, "%s: dev=%p\n", __func__, dev);
for (i = 1; i < NR_PXA_ENDPOINTS; i++)
pxa_ep_setup(&dev->pxa_ep[i]);
}
/**
* pxa_ep_alloc_request - Allocate usb request
* @_ep: usb endpoint
* @gfp_flags:
*
* For the pxa27x, these can just wrap kmalloc/kfree. gadget drivers
* must still pass correctly initialized endpoints, since other controller
* drivers may care about how it's currently set up (dma issues etc).
*/
static struct usb_request *
pxa_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
{
struct pxa27x_request *req;
req = kzalloc(sizeof *req, gfp_flags);
if (!req)
return NULL;
INIT_LIST_HEAD(&req->queue);
req->in_use = 0;
req->udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
return &req->req;
}
/**
* pxa_ep_free_request - Free usb request
* @_ep: usb endpoint
* @_req: usb request
*
* Wrapper around kfree to free _req
*/
static void pxa_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
{
struct pxa27x_request *req;
req = container_of(_req, struct pxa27x_request, req);
WARN_ON(!list_empty(&req->queue));
kfree(req);
}
/**
* ep_add_request - add a request to the endpoint's queue
* @ep: usb endpoint
* @req: usb request
*
* Context: ep->lock held
*
* Queues the request in the endpoint's queue, and enables the interrupts
* on the endpoint.
*/
static void ep_add_request(struct pxa_ep *ep, struct pxa27x_request *req)
{
if (unlikely(!req))
return;
ep_vdbg(ep, "req:%p, lg=%d, udccsr=0x%03x\n", req,
req->req.length, udc_ep_readl(ep, UDCCSR));
req->in_use = 1;
list_add_tail(&req->queue, &ep->queue);
pio_irq_enable(ep);
}
/**
* ep_del_request - removes a request from the endpoint's queue
* @ep: usb endpoint
* @req: usb request
*
* Context: ep->lock held
*
* Unqueue the request from the endpoint's queue. If there are no more requests
* on the endpoint, and if it's not the control endpoint, interrupts are
* disabled on the endpoint.
*/
static void ep_del_request(struct pxa_ep *ep, struct pxa27x_request *req)
{
if (unlikely(!req))
return;
ep_vdbg(ep, "req:%p, lg=%d, udccsr=0x%03x\n", req,
req->req.length, udc_ep_readl(ep, UDCCSR));
list_del_init(&req->queue);
req->in_use = 0;
if (!is_ep0(ep) && list_empty(&ep->queue))
pio_irq_disable(ep);
}
/**
* req_done - Complete an usb request
* @ep: pxa physical endpoint
* @req: pxa request
* @status: usb request status sent to gadget API
* @pflags: flags of previous spinlock_irq_save() or NULL if no lock held
*
* Context: ep->lock held if flags not NULL, else ep->lock released
*
* Retire a pxa27x usb request. Endpoint must be locked.
*/
static void req_done(struct pxa_ep *ep, struct pxa27x_request *req, int status,
unsigned long *pflags)
{
unsigned long flags;
ep_del_request(ep, req);
if (likely(req->req.status == -EINPROGRESS))
req->req.status = status;
else
status = req->req.status;
if (status && status != -ESHUTDOWN)
ep_dbg(ep, "complete req %p stat %d len %u/%u\n",
&req->req, status,
req->req.actual, req->req.length);
if (pflags)
spin_unlock_irqrestore(&ep->lock, *pflags);
local_irq_save(flags);
req->req.complete(&req->udc_usb_ep->usb_ep, &req->req);
local_irq_restore(flags);
if (pflags)
spin_lock_irqsave(&ep->lock, *pflags);
}
/**
* ep_end_out_req - Ends endpoint OUT request
* @ep: physical endpoint
* @req: pxa request
* @pflags: flags of previous spinlock_irq_save() or NULL if no lock held
*
* Context: ep->lock held or released (see req_done())
*
* Ends endpoint OUT request (completes usb request).
*/
static void ep_end_out_req(struct pxa_ep *ep, struct pxa27x_request *req,
unsigned long *pflags)
{
inc_ep_stats_reqs(ep, !USB_DIR_IN);
req_done(ep, req, 0, pflags);
}
/**
* ep0_end_out_req - Ends control endpoint OUT request (ends data stage)
* @ep: physical endpoint
* @req: pxa request
* @pflags: flags of previous spinlock_irq_save() or NULL if no lock held
*
* Context: ep->lock held or released (see req_done())
*
* Ends control endpoint OUT request (completes usb request), and puts
* control endpoint into idle state
*/
static void ep0_end_out_req(struct pxa_ep *ep, struct pxa27x_request *req,
unsigned long *pflags)
{
set_ep0state(ep->dev, OUT_STATUS_STAGE);
ep_end_out_req(ep, req, pflags);
ep0_idle(ep->dev);
}
/**
* ep_end_in_req - Ends endpoint IN request
* @ep: physical endpoint
* @req: pxa request
* @pflags: flags of previous spinlock_irq_save() or NULL if no lock held
*
* Context: ep->lock held or released (see req_done())
*
* Ends endpoint IN request (completes usb request).
*/
static void ep_end_in_req(struct pxa_ep *ep, struct pxa27x_request *req,
unsigned long *pflags)
{
inc_ep_stats_reqs(ep, USB_DIR_IN);
req_done(ep, req, 0, pflags);
}
/**
* ep0_end_in_req - Ends control endpoint IN request (ends data stage)
* @ep: physical endpoint
* @req: pxa request
* @pflags: flags of previous spinlock_irq_save() or NULL if no lock held
*
* Context: ep->lock held or released (see req_done())
*
* Ends control endpoint IN request (completes usb request), and puts
* control endpoint into status state
*/
static void ep0_end_in_req(struct pxa_ep *ep, struct pxa27x_request *req,
unsigned long *pflags)
{
set_ep0state(ep->dev, IN_STATUS_STAGE);
ep_end_in_req(ep, req, pflags);
}
/**
* nuke - Dequeue all requests
* @ep: pxa endpoint
* @status: usb request status
*
* Context: ep->lock released
*
* Dequeues all requests on an endpoint. As a side effect, interrupts will be
* disabled on that endpoint (because no more requests).
*/
static void nuke(struct pxa_ep *ep, int status)
{
struct pxa27x_request *req;
unsigned long flags;
spin_lock_irqsave(&ep->lock, flags);
while (!list_empty(&ep->queue)) {
req = list_entry(ep->queue.next, struct pxa27x_request, queue);
req_done(ep, req, status, &flags);
}
spin_unlock_irqrestore(&ep->lock, flags);
}
/**
* read_packet - transfer 1 packet from an OUT endpoint into request
* @ep: pxa physical endpoint
* @req: usb request
*
* Takes bytes from OUT endpoint and transfers them info the usb request.
* If there is less space in request than bytes received in OUT endpoint,
* bytes are left in the OUT endpoint.
*
* Returns how many bytes were actually transferred
*/
static int read_packet(struct pxa_ep *ep, struct pxa27x_request *req)
{
u32 *buf;
int bytes_ep, bufferspace, count, i;
bytes_ep = ep_count_bytes_remain(ep);
bufferspace = req->req.length - req->req.actual;
buf = (u32 *)(req->req.buf + req->req.actual);
prefetchw(buf);
if (likely(!ep_is_empty(ep)))
count = min(bytes_ep, bufferspace);
else /* zlp */
count = 0;
for (i = count; i > 0; i -= 4)
*buf++ = udc_ep_readl(ep, UDCDR);
req->req.actual += count;
ep_write_UDCCSR(ep, UDCCSR_PC);
return count;
}
/**
* write_packet - transfer 1 packet from request into an IN endpoint
* @ep: pxa physical endpoint
* @req: usb request
* @max: max bytes that fit into endpoint
*
* Takes bytes from usb request, and transfers them into the physical
* endpoint. If there are no bytes to transfer, doesn't write anything
* to physical endpoint.
*
* Returns how many bytes were actually transferred.
*/
static int write_packet(struct pxa_ep *ep, struct pxa27x_request *req,
unsigned int max)
{
int length, count, remain, i;
u32 *buf;
u8 *buf_8;
buf = (u32 *)(req->req.buf + req->req.actual);
prefetch(buf);
length = min(req->req.length - req->req.actual, max);
req->req.actual += length;
remain = length & 0x3;
count = length & ~(0x3);
for (i = count; i > 0 ; i -= 4)
udc_ep_writel(ep, UDCDR, *buf++);
buf_8 = (u8 *)buf;
for (i = remain; i > 0; i--)
udc_ep_writeb(ep, UDCDR, *buf_8++);
ep_vdbg(ep, "length=%d+%d, udccsr=0x%03x\n", count, remain,
udc_ep_readl(ep, UDCCSR));
return length;
}
/**
* read_fifo - Transfer packets from OUT endpoint into usb request
* @ep: pxa physical endpoint
* @req: usb request
*
* Context: callable when in_interrupt()
*
* Unload as many packets as possible from the fifo we use for usb OUT
* transfers and put them into the request. Caller should have made sure
* there's at least one packet ready.
* Doesn't complete the request, that's the caller's job
*
* Returns 1 if the request completed, 0 otherwise
*/
static int read_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
{
int count, is_short, completed = 0;
while (epout_has_pkt(ep)) {
count = read_packet(ep, req);
inc_ep_stats_bytes(ep, count, !USB_DIR_IN);
is_short = (count < ep->fifo_size);
ep_dbg(ep, "read udccsr:%03x, count:%d bytes%s req %p %d/%d\n",
udc_ep_readl(ep, UDCCSR), count, is_short ? "/S" : "",
&req->req, req->req.actual, req->req.length);
/* completion */
if (is_short || req->req.actual == req->req.length) {
completed = 1;
break;
}
/* finished that packet. the next one may be waiting... */
}
return completed;
}
/**
* write_fifo - transfer packets from usb request into an IN endpoint
* @ep: pxa physical endpoint
* @req: pxa usb request
*
* Write to an IN endpoint fifo, as many packets as possible.
* irqs will use this to write the rest later.
* caller guarantees at least one packet buffer is ready (or a zlp).
* Doesn't complete the request, that's the caller's job
*
* Returns 1 if request fully transferred, 0 if partial transfer
*/
static int write_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
{
unsigned max;
int count, is_short, is_last = 0, completed = 0, totcount = 0;
u32 udccsr;
max = ep->fifo_size;
do {
is_short = 0;
udccsr = udc_ep_readl(ep, UDCCSR);
if (udccsr & UDCCSR_PC) {
ep_vdbg(ep, "Clearing Transmit Complete, udccsr=%x\n",
udccsr);
ep_write_UDCCSR(ep, UDCCSR_PC);
}
if (udccsr & UDCCSR_TRN) {
ep_vdbg(ep, "Clearing Underrun on, udccsr=%x\n",
udccsr);
ep_write_UDCCSR(ep, UDCCSR_TRN);
}
count = write_packet(ep, req, max);
inc_ep_stats_bytes(ep, count, USB_DIR_IN);
totcount += count;
/* last packet is usually short (or a zlp) */
if (unlikely(count < max)) {
is_last = 1;
is_short = 1;
} else {
if (likely(req->req.length > req->req.actual)
|| req->req.zero)
is_last = 0;
else
is_last = 1;
/* interrupt/iso maxpacket may not fill the fifo */
is_short = unlikely(max < ep->fifo_size);
}
if (is_short)
ep_write_UDCCSR(ep, UDCCSR_SP);
/* requests complete when all IN data is in the FIFO */
if (is_last) {
completed = 1;
break;
}
} while (!ep_is_full(ep));
ep_dbg(ep, "wrote count:%d bytes%s%s, left:%d req=%p\n",
totcount, is_last ? "/L" : "", is_short ? "/S" : "",
req->req.length - req->req.actual, &req->req);
return completed;
}
/**
* read_ep0_fifo - Transfer packets from control endpoint into usb request
* @ep: control endpoint
* @req: pxa usb request
*
* Special ep0 version of the above read_fifo. Reads as many bytes from control
* endpoint as can be read, and stores them into usb request (limited by request
* maximum length).
*
* Returns 0 if usb request only partially filled, 1 if fully filled
*/
static int read_ep0_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
{
int count, is_short, completed = 0;
while (epout_has_pkt(ep)) {
count = read_packet(ep, req);
ep_write_UDCCSR(ep, UDCCSR0_OPC);
inc_ep_stats_bytes(ep, count, !USB_DIR_IN);
is_short = (count < ep->fifo_size);
ep_dbg(ep, "read udccsr:%03x, count:%d bytes%s req %p %d/%d\n",
udc_ep_readl(ep, UDCCSR), count, is_short ? "/S" : "",
&req->req, req->req.actual, req->req.length);
if (is_short || req->req.actual >= req->req.length) {
completed = 1;
break;
}
}
return completed;
}
/**
* write_ep0_fifo - Send a request to control endpoint (ep0 in)
* @ep: control endpoint
* @req: request
*
* Context: callable when in_interrupt()
*
* Sends a request (or a part of the request) to the control endpoint (ep0 in).
* If the request doesn't fit, the remaining part will be sent from irq.
* The request is considered fully written only if either :
* - last write transferred all remaining bytes, but fifo was not fully filled
* - last write was a 0 length write
*
* Returns 1 if request fully written, 0 if request only partially sent
*/
static int write_ep0_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
{
unsigned count;
int is_last, is_short;
count = write_packet(ep, req, EP0_FIFO_SIZE);
inc_ep_stats_bytes(ep, count, USB_DIR_IN);
is_short = (count < EP0_FIFO_SIZE);
is_last = ((count == 0) || (count < EP0_FIFO_SIZE));
/* Sends either a short packet or a 0 length packet */
if (unlikely(is_short))
ep_write_UDCCSR(ep, UDCCSR0_IPR);
ep_dbg(ep, "in %d bytes%s%s, %d left, req=%p, udccsr0=0x%03x\n",
count, is_short ? "/S" : "", is_last ? "/L" : "",
req->req.length - req->req.actual,
&req->req, udc_ep_readl(ep, UDCCSR));
return is_last;
}
/**
* pxa_ep_queue - Queue a request into an IN endpoint
* @_ep: usb endpoint
* @_req: usb request
* @gfp_flags: flags
*
* Context: normally called when !in_interrupt, but callable when in_interrupt()
* in the special case of ep0 setup :
* (irq->handle_ep0_ctrl_req->gadget_setup->pxa_ep_queue)
*
* Returns 0 if succedeed, error otherwise
*/
static int pxa_ep_queue(struct usb_ep *_ep, struct usb_request *_req,
gfp_t gfp_flags)
{
struct udc_usb_ep *udc_usb_ep;
struct pxa_ep *ep;
struct pxa27x_request *req;
struct pxa_udc *dev;
unsigned long flags;
int rc = 0;
int is_first_req;
unsigned length;
int recursion_detected;
req = container_of(_req, struct pxa27x_request, req);
udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
if (unlikely(!_req || !_req->complete || !_req->buf))
return -EINVAL;
if (unlikely(!_ep))
return -EINVAL;
dev = udc_usb_ep->dev;
ep = udc_usb_ep->pxa_ep;
if (unlikely(!ep))
return -EINVAL;
dev = ep->dev;
if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)) {
ep_dbg(ep, "bogus device state\n");
return -ESHUTDOWN;
}
/* iso is always one packet per request, that's the only way
* we can report per-packet status. that also helps with dma.
*/
if (unlikely(EPXFERTYPE_is_ISO(ep)
&& req->req.length > ep->fifo_size))
return -EMSGSIZE;
spin_lock_irqsave(&ep->lock, flags);
recursion_detected = ep->in_handle_ep;
is_first_req = list_empty(&ep->queue);
ep_dbg(ep, "queue req %p(first=%s), len %d buf %p\n",
_req, is_first_req ? "yes" : "no",
_req->length, _req->buf);
if (!ep->enabled) {
_req->status = -ESHUTDOWN;
rc = -ESHUTDOWN;
goto out_locked;
}
if (req->in_use) {
ep_err(ep, "refusing to queue req %p (already queued)\n", req);
goto out_locked;
}
length = _req->length;
_req->status = -EINPROGRESS;
_req->actual = 0;
ep_add_request(ep, req);
spin_unlock_irqrestore(&ep->lock, flags);
if (is_ep0(ep)) {
switch (dev->ep0state) {
case WAIT_ACK_SET_CONF_INTERF:
if (length == 0) {
ep_end_in_req(ep, req, NULL);
} else {
ep_err(ep, "got a request of %d bytes while"
"in state WAIT_ACK_SET_CONF_INTERF\n",
length);
ep_del_request(ep, req);
rc = -EL2HLT;
}
ep0_idle(ep->dev);
break;
case IN_DATA_STAGE:
if (!ep_is_full(ep))
if (write_ep0_fifo(ep, req))
ep0_end_in_req(ep, req, NULL);
break;
case OUT_DATA_STAGE:
if ((length == 0) || !epout_has_pkt(ep))
if (read_ep0_fifo(ep, req))
ep0_end_out_req(ep, req, NULL);
break;
default:
ep_err(ep, "odd state %s to send me a request\n",
EP0_STNAME(ep->dev));
ep_del_request(ep, req);
rc = -EL2HLT;
break;
}
} else {
if (!recursion_detected)
handle_ep(ep);
}
out:
return rc;
out_locked:
spin_unlock_irqrestore(&ep->lock, flags);
goto out;
}
/**
* pxa_ep_dequeue - Dequeue one request
* @_ep: usb endpoint
* @_req: usb request
*
* Return 0 if no error, -EINVAL or -ECONNRESET otherwise
*/
static int pxa_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
{
struct pxa_ep *ep;
struct udc_usb_ep *udc_usb_ep;
struct pxa27x_request *req;
unsigned long flags;
int rc = -EINVAL;
if (!_ep)
return rc;
udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
ep = udc_usb_ep->pxa_ep;
if (!ep || is_ep0(ep))
return rc;
spin_lock_irqsave(&ep->lock, flags);
/* make sure it's actually queued on this endpoint */
list_for_each_entry(req, &ep->queue, queue) {
if (&req->req == _req) {
rc = 0;
break;
}
}
spin_unlock_irqrestore(&ep->lock, flags);
if (!rc)
req_done(ep, req, -ECONNRESET, NULL);
return rc;
}
/**
* pxa_ep_set_halt - Halts operations on one endpoint
* @_ep: usb endpoint
* @value:
*
* Returns 0 if no error, -EINVAL, -EROFS, -EAGAIN otherwise
*/
static int pxa_ep_set_halt(struct usb_ep *_ep, int value)
{
struct pxa_ep *ep;
struct udc_usb_ep *udc_usb_ep;
unsigned long flags;
int rc;
if (!_ep)
return -EINVAL;
udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
ep = udc_usb_ep->pxa_ep;
if (!ep || is_ep0(ep))
return -EINVAL;
if (value == 0) {
/*
* This path (reset toggle+halt) is needed to implement
* SET_INTERFACE on normal hardware. but it can't be
* done from software on the PXA UDC, and the hardware
* forgets to do it as part of SET_INTERFACE automagic.
*/
ep_dbg(ep, "only host can clear halt\n");
return -EROFS;
}
spin_lock_irqsave(&ep->lock, flags);
rc = -EAGAIN;
if (ep->dir_in && (ep_is_full(ep) || !list_empty(&ep->queue)))
goto out;
/* FST, FEF bits are the same for control and non control endpoints */
rc = 0;
ep_write_UDCCSR(ep, UDCCSR_FST | UDCCSR_FEF);
if (is_ep0(ep))
set_ep0state(ep->dev, STALL);
out:
spin_unlock_irqrestore(&ep->lock, flags);
return rc;
}
/**
* pxa_ep_fifo_status - Get how many bytes in physical endpoint
* @_ep: usb endpoint
*
* Returns number of bytes in OUT fifos. Broken for IN fifos.
*/
static int pxa_ep_fifo_status(struct usb_ep *_ep)
{
struct pxa_ep *ep;
struct udc_usb_ep *udc_usb_ep;
if (!_ep)
return -ENODEV;
udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
ep = udc_usb_ep->pxa_ep;
if (!ep || is_ep0(ep))
return -ENODEV;
if (ep->dir_in)
return -EOPNOTSUPP;
if (ep->dev->gadget.speed == USB_SPEED_UNKNOWN || ep_is_empty(ep))
return 0;
else
return ep_count_bytes_remain(ep) + 1;
}
/**
* pxa_ep_fifo_flush - Flushes one endpoint
* @_ep: usb endpoint
*
* Discards all data in one endpoint(IN or OUT), except control endpoint.
*/
static void pxa_ep_fifo_flush(struct usb_ep *_ep)
{
struct pxa_ep *ep;
struct udc_usb_ep *udc_usb_ep;
unsigned long flags;
if (!_ep)
return;
udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
ep = udc_usb_ep->pxa_ep;
if (!ep || is_ep0(ep))
return;
spin_lock_irqsave(&ep->lock, flags);
if (unlikely(!list_empty(&ep->queue)))
ep_dbg(ep, "called while queue list not empty\n");
ep_dbg(ep, "called\n");
/* for OUT, just read and discard the FIFO contents. */
if (!ep->dir_in) {
while (!ep_is_empty(ep))
udc_ep_readl(ep, UDCDR);
} else {
/* most IN status is the same, but ISO can't stall */
ep_write_UDCCSR(ep,
UDCCSR_PC | UDCCSR_FEF | UDCCSR_TRN
| (EPXFERTYPE_is_ISO(ep) ? 0 : UDCCSR_SST));
}
spin_unlock_irqrestore(&ep->lock, flags);
}
/**
* pxa_ep_enable - Enables usb endpoint
* @_ep: usb endpoint
* @desc: usb endpoint descriptor
*
* Nothing much to do here, as ep configuration is done once and for all
* before udc is enabled. After udc enable, no physical endpoint configuration
* can be changed.
* Function makes sanity checks and flushes the endpoint.
*/
static int pxa_ep_enable(struct usb_ep *_ep,
const struct usb_endpoint_descriptor *desc)
{
struct pxa_ep *ep;
struct udc_usb_ep *udc_usb_ep;
struct pxa_udc *udc;
if (!_ep || !desc)
return -EINVAL;
udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
if (udc_usb_ep->pxa_ep) {
ep = udc_usb_ep->pxa_ep;
ep_warn(ep, "usb_ep %s already enabled, doing nothing\n",
_ep->name);
} else {
ep = find_pxa_ep(udc_usb_ep->dev, udc_usb_ep);
}
if (!ep || is_ep0(ep)) {
dev_err(udc_usb_ep->dev->dev,
"unable to match pxa_ep for ep %s\n",
_ep->name);
return -EINVAL;
}
if ((desc->bDescriptorType != USB_DT_ENDPOINT)
|| (ep->type != usb_endpoint_type(desc))) {
ep_err(ep, "type mismatch\n");
return -EINVAL;
}
if (ep->fifo_size < usb_endpoint_maxp(desc)) {
ep_err(ep, "bad maxpacket\n");
return -ERANGE;
}
udc_usb_ep->pxa_ep = ep;
udc = ep->dev;
if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
ep_err(ep, "bogus device state\n");
return -ESHUTDOWN;
}
ep->enabled = 1;
/* flush fifo (mostly for OUT buffers) */
pxa_ep_fifo_flush(_ep);
ep_dbg(ep, "enabled\n");
return 0;
}
/**
* pxa_ep_disable - Disable usb endpoint
* @_ep: usb endpoint
*
* Same as for pxa_ep_enable, no physical endpoint configuration can be
* changed.
* Function flushes the endpoint and related requests.
*/
static int pxa_ep_disable(struct usb_ep *_ep)
{
struct pxa_ep *ep;
struct udc_usb_ep *udc_usb_ep;
if (!_ep)
return -EINVAL;
udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
ep = udc_usb_ep->pxa_ep;
if (!ep || is_ep0(ep) || !list_empty(&ep->queue))
return -EINVAL;
ep->enabled = 0;
nuke(ep, -ESHUTDOWN);
pxa_ep_fifo_flush(_ep);
udc_usb_ep->pxa_ep = NULL;
ep_dbg(ep, "disabled\n");
return 0;
}
static struct usb_ep_ops pxa_ep_ops = {
.enable = pxa_ep_enable,
.disable = pxa_ep_disable,
.alloc_request = pxa_ep_alloc_request,
.free_request = pxa_ep_free_request,
.queue = pxa_ep_queue,
.dequeue = pxa_ep_dequeue,
.set_halt = pxa_ep_set_halt,
.fifo_status = pxa_ep_fifo_status,
.fifo_flush = pxa_ep_fifo_flush,
};
/**
* dplus_pullup - Connect or disconnect pullup resistor to D+ pin
* @udc: udc device
* @on: 0 if disconnect pullup resistor, 1 otherwise
* Context: any
*
* Handle D+ pullup resistor, make the device visible to the usb bus, and
* declare it as a full speed usb device
*/
static void dplus_pullup(struct pxa_udc *udc, int on)
{
if (on) {
if (gpio_is_valid(udc->mach->gpio_pullup))
gpio_set_value(udc->mach->gpio_pullup,
!udc->mach->gpio_pullup_inverted);
if (udc->mach->udc_command)
udc->mach->udc_command(PXA2XX_UDC_CMD_CONNECT);
} else {
if (gpio_is_valid(udc->mach->gpio_pullup))
gpio_set_value(udc->mach->gpio_pullup,
udc->mach->gpio_pullup_inverted);
if (udc->mach->udc_command)
udc->mach->udc_command(PXA2XX_UDC_CMD_DISCONNECT);
}
udc->pullup_on = on;
}
/**
* pxa_udc_get_frame - Returns usb frame number
* @_gadget: usb gadget
*/
static int pxa_udc_get_frame(struct usb_gadget *_gadget)
{
struct pxa_udc *udc = to_gadget_udc(_gadget);
return (udc_readl(udc, UDCFNR) & 0x7ff);
}
/**
* pxa_udc_wakeup - Force udc device out of suspend
* @_gadget: usb gadget
*
* Returns 0 if successful, error code otherwise
*/
static int pxa_udc_wakeup(struct usb_gadget *_gadget)
{
struct pxa_udc *udc = to_gadget_udc(_gadget);
/* host may not have enabled remote wakeup */
if ((udc_readl(udc, UDCCR) & UDCCR_DWRE) == 0)
return -EHOSTUNREACH;
udc_set_mask_UDCCR(udc, UDCCR_UDR);
return 0;
}
static void udc_enable(struct pxa_udc *udc);
static void udc_disable(struct pxa_udc *udc);
/**
* should_enable_udc - Tells if UDC should be enabled
* @udc: udc device
* Context: any
*
* The UDC should be enabled if :
* - the pullup resistor is connected
* - and a gadget driver is bound
* - and vbus is sensed (or no vbus sense is available)
*
* Returns 1 if UDC should be enabled, 0 otherwise
*/
static int should_enable_udc(struct pxa_udc *udc)
{
int put_on;
put_on = ((udc->pullup_on) && (udc->driver));
put_on &= ((udc->vbus_sensed) || (IS_ERR_OR_NULL(udc->transceiver)));
return put_on;
}
/**
* should_disable_udc - Tells if UDC should be disabled
* @udc: udc device
* Context: any
*
* The UDC should be disabled if :
* - the pullup resistor is not connected
* - or no gadget driver is bound
* - or no vbus is sensed (when vbus sesing is available)
*
* Returns 1 if UDC should be disabled
*/
static int should_disable_udc(struct pxa_udc *udc)
{
int put_off;
put_off = ((!udc->pullup_on) || (!udc->driver));
put_off |= ((!udc->vbus_sensed) && (!IS_ERR_OR_NULL(udc->transceiver)));
return put_off;
}
/**
* pxa_udc_pullup - Offer manual D+ pullup control
* @_gadget: usb gadget using the control
* @is_active: 0 if disconnect, else connect D+ pullup resistor
* Context: !in_interrupt()
*
* Returns 0 if OK, -EOPNOTSUPP if udc driver doesn't handle D+ pullup
*/
static int pxa_udc_pullup(struct usb_gadget *_gadget, int is_active)
{
struct pxa_udc *udc = to_gadget_udc(_gadget);
if (!gpio_is_valid(udc->mach->gpio_pullup) && !udc->mach->udc_command)
return -EOPNOTSUPP;
dplus_pullup(udc, is_active);
if (should_enable_udc(udc))
udc_enable(udc);
if (should_disable_udc(udc))
udc_disable(udc);
return 0;
}
static void udc_enable(struct pxa_udc *udc);
static void udc_disable(struct pxa_udc *udc);
/**
* pxa_udc_vbus_session - Called by external transceiver to enable/disable udc
* @_gadget: usb gadget
* @is_active: 0 if should disable the udc, 1 if should enable
*
* Enables the udc, and optionnaly activates D+ pullup resistor. Or disables the
* udc, and deactivates D+ pullup resistor.
*
* Returns 0
*/
static int pxa_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
{
struct pxa_udc *udc = to_gadget_udc(_gadget);
udc->vbus_sensed = is_active;
if (should_enable_udc(udc))
udc_enable(udc);
if (should_disable_udc(udc))
udc_disable(udc);
return 0;
}
/**
* pxa_udc_vbus_draw - Called by gadget driver after SET_CONFIGURATION completed
* @_gadget: usb gadget
* @mA: current drawn
*
* Context: !in_interrupt()
*
* Called after a configuration was chosen by a USB host, to inform how much
* current can be drawn by the device from VBus line.
*
* Returns 0 or -EOPNOTSUPP if no transceiver is handling the udc
*/
static int pxa_udc_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
{
struct pxa_udc *udc;
udc = to_gadget_udc(_gadget);
if (!IS_ERR_OR_NULL(udc->transceiver))
return usb_phy_set_power(udc->transceiver, mA);
return -EOPNOTSUPP;
}
static int pxa27x_udc_start(struct usb_gadget *g,
struct usb_gadget_driver *driver);
static int pxa27x_udc_stop(struct usb_gadget *g,
struct usb_gadget_driver *driver);
static const struct usb_gadget_ops pxa_udc_ops = {
.get_frame = pxa_udc_get_frame,
.wakeup = pxa_udc_wakeup,
.pullup = pxa_udc_pullup,
.vbus_session = pxa_udc_vbus_session,
.vbus_draw = pxa_udc_vbus_draw,
.udc_start = pxa27x_udc_start,
.udc_stop = pxa27x_udc_stop,
};
/**
* udc_disable - disable udc device controller
* @udc: udc device
* Context: any
*
* Disables the udc device : disables clocks, udc interrupts, control endpoint
* interrupts.
*/
static void udc_disable(struct pxa_udc *udc)
{
if (!udc->enabled)
return;
udc_writel(udc, UDCICR0, 0);
udc_writel(udc, UDCICR1, 0);
udc_clear_mask_UDCCR(udc, UDCCR_UDE);
clk_disable(udc->clk);
ep0_idle(udc);
udc->gadget.speed = USB_SPEED_UNKNOWN;
udc->enabled = 0;
}
/**
* udc_init_data - Initialize udc device data structures
* @dev: udc device
*
* Initializes gadget endpoint list, endpoints locks. No action is taken
* on the hardware.
*/
static void udc_init_data(struct pxa_udc *dev)
{
int i;
struct pxa_ep *ep;
/* device/ep0 records init */
INIT_LIST_HEAD(&dev->gadget.ep_list);
INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
dev->udc_usb_ep[0].pxa_ep = &dev->pxa_ep[0];
ep0_idle(dev);
/* PXA endpoints init */
for (i = 0; i < NR_PXA_ENDPOINTS; i++) {
ep = &dev->pxa_ep[i];
ep->enabled = is_ep0(ep);
INIT_LIST_HEAD(&ep->queue);
spin_lock_init(&ep->lock);
}
/* USB endpoints init */
for (i = 1; i < NR_USB_ENDPOINTS; i++) {
list_add_tail(&dev->udc_usb_ep[i].usb_ep.ep_list,
&dev->gadget.ep_list);
usb_ep_set_maxpacket_limit(&dev->udc_usb_ep[i].usb_ep,
dev->udc_usb_ep[i].usb_ep.maxpacket);
}
}
/**
* udc_enable - Enables the udc device
* @dev: udc device
*
* Enables the udc device : enables clocks, udc interrupts, control endpoint
* interrupts, sets usb as UDC client and setups endpoints.
*/
static void udc_enable(struct pxa_udc *udc)
{
if (udc->enabled)
return;
udc_writel(udc, UDCICR0, 0);
udc_writel(udc, UDCICR1, 0);
udc_clear_mask_UDCCR(udc, UDCCR_UDE);
clk_enable(udc->clk);
ep0_idle(udc);
udc->gadget.speed = USB_SPEED_FULL;
memset(&udc->stats, 0, sizeof(udc->stats));
udc_set_mask_UDCCR(udc, UDCCR_UDE);
ep_write_UDCCSR(&udc->pxa_ep[0], UDCCSR0_ACM);
udelay(2);
if (udc_readl(udc, UDCCR) & UDCCR_EMCE)
dev_err(udc->dev, "Configuration errors, udc disabled\n");
/*
* Caller must be able to sleep in order to cope with startup transients
*/
msleep(100);
/* enable suspend/resume and reset irqs */
udc_writel(udc, UDCICR1,
UDCICR1_IECC | UDCICR1_IERU
| UDCICR1_IESU | UDCICR1_IERS);
/* enable ep0 irqs */
pio_irq_enable(&udc->pxa_ep[0]);
udc->enabled = 1;
}
/**
* pxa27x_start - Register gadget driver
* @driver: gadget driver
* @bind: bind function
*
* 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.
*
* Note that the udc is not automatically enabled. Check function
* should_enable_udc().
*
* Returns 0 if no error, -EINVAL, -ENODEV, -EBUSY otherwise
*/
static int pxa27x_udc_start(struct usb_gadget *g,
struct usb_gadget_driver *driver)
{
struct pxa_udc *udc = to_pxa(g);
int retval;
/* first hook up the driver ... */
udc->driver = driver;
dplus_pullup(udc, 1);
if (!IS_ERR_OR_NULL(udc->transceiver)) {
retval = otg_set_peripheral(udc->transceiver->otg,
&udc->gadget);
if (retval) {
dev_err(udc->dev, "can't bind to transceiver\n");
goto fail;
}
}
if (should_enable_udc(udc))
udc_enable(udc);
return 0;
fail:
udc->driver = NULL;
return retval;
}
/**
* stop_activity - Stops udc endpoints
* @udc: udc device
* @driver: gadget driver
*
* Disables all udc endpoints (even control endpoint), report disconnect to
* the gadget user.
*/
static void stop_activity(struct pxa_udc *udc, struct usb_gadget_driver *driver)
{
int i;
/* don't disconnect drivers more than once */
if (udc->gadget.speed == USB_SPEED_UNKNOWN)
driver = NULL;
udc->gadget.speed = USB_SPEED_UNKNOWN;
for (i = 0; i < NR_USB_ENDPOINTS; i++)
pxa_ep_disable(&udc->udc_usb_ep[i].usb_ep);
}
/**
* pxa27x_udc_stop - Unregister the gadget driver
* @driver: gadget driver
*
* Returns 0 if no error, -ENODEV, -EINVAL otherwise
*/
static int pxa27x_udc_stop(struct usb_gadget *g,
struct usb_gadget_driver *driver)
{
struct pxa_udc *udc = to_pxa(g);
stop_activity(udc, driver);
udc_disable(udc);
dplus_pullup(udc, 0);
udc->driver = NULL;
if (!IS_ERR_OR_NULL(udc->transceiver))
return otg_set_peripheral(udc->transceiver->otg, NULL);
return 0;
}
/**
* handle_ep0_ctrl_req - handle control endpoint control request
* @udc: udc device
* @req: control request
*/
static void handle_ep0_ctrl_req(struct pxa_udc *udc,
struct pxa27x_request *req)
{
struct pxa_ep *ep = &udc->pxa_ep[0];
union {
struct usb_ctrlrequest r;
u32 word[2];
} u;
int i;
int have_extrabytes = 0;
unsigned long flags;
nuke(ep, -EPROTO);
spin_lock_irqsave(&ep->lock, flags);
/*
* In the PXA320 manual, in the section about Back-to-Back setup
* packets, it describes this situation. The solution is to set OPC to
* get rid of the status packet, and then continue with the setup
* packet. Generalize to pxa27x CPUs.
*/
if (epout_has_pkt(ep) && (ep_count_bytes_remain(ep) == 0))
ep_write_UDCCSR(ep, UDCCSR0_OPC);
/* read SETUP packet */
for (i = 0; i < 2; i++) {
if (unlikely(ep_is_empty(ep)))
goto stall;
u.word[i] = udc_ep_readl(ep, UDCDR);
}
have_extrabytes = !ep_is_empty(ep);
while (!ep_is_empty(ep)) {
i = udc_ep_readl(ep, UDCDR);
ep_err(ep, "wrong to have extra bytes for setup : 0x%08x\n", i);
}
ep_dbg(ep, "SETUP %02x.%02x v%04x i%04x l%04x\n",
u.r.bRequestType, u.r.bRequest,
le16_to_cpu(u.r.wValue), le16_to_cpu(u.r.wIndex),
le16_to_cpu(u.r.wLength));
if (unlikely(have_extrabytes))
goto stall;
if (u.r.bRequestType & USB_DIR_IN)
set_ep0state(udc, IN_DATA_STAGE);
else
set_ep0state(udc, OUT_DATA_STAGE);
/* Tell UDC to enter Data Stage */
ep_write_UDCCSR(ep, UDCCSR0_SA | UDCCSR0_OPC);
spin_unlock_irqrestore(&ep->lock, flags);
i = udc->driver->setup(&udc->gadget, &u.r);
spin_lock_irqsave(&ep->lock, flags);
if (i < 0)
goto stall;
out:
spin_unlock_irqrestore(&ep->lock, flags);
return;
stall:
ep_dbg(ep, "protocol STALL, udccsr0=%03x err %d\n",
udc_ep_readl(ep, UDCCSR), i);
ep_write_UDCCSR(ep, UDCCSR0_FST | UDCCSR0_FTF);
set_ep0state(udc, STALL);
goto out;
}
/**
* handle_ep0 - Handle control endpoint data transfers
* @udc: udc device
* @fifo_irq: 1 if triggered by fifo service type irq
* @opc_irq: 1 if triggered by output packet complete type irq
*
* Context : when in_interrupt() or with ep->lock held
*
* Tries to transfer all pending request data into the endpoint and/or
* transfer all pending data in the endpoint into usb requests.
* Handles states of ep0 automata.
*
* PXA27x hardware handles several standard usb control requests without
* driver notification. The requests fully handled by hardware are :
* SET_ADDRESS, SET_FEATURE, CLEAR_FEATURE, GET_CONFIGURATION, GET_INTERFACE,
* GET_STATUS
* The requests handled by hardware, but with irq notification are :
* SYNCH_FRAME, SET_CONFIGURATION, SET_INTERFACE
* The remaining standard requests really handled by handle_ep0 are :
* GET_DESCRIPTOR, SET_DESCRIPTOR, specific requests.
* Requests standardized outside of USB 2.0 chapter 9 are handled more
* uniformly, by gadget drivers.
*
* The control endpoint state machine is _not_ USB spec compliant, it's even
* hardly compliant with Intel PXA270 developers guide.
* The key points which inferred this state machine are :
* - on every setup token, bit UDCCSR0_SA is raised and held until cleared by
* software.
* - on every OUT packet received, UDCCSR0_OPC is raised and held until
* cleared by software.
* - clearing UDCCSR0_OPC always flushes ep0. If in setup stage, never do it
* before reading ep0.
* This is true only for PXA27x. This is not true anymore for PXA3xx family
* (check Back-to-Back setup packet in developers guide).
* - irq can be called on a "packet complete" event (opc_irq=1), while
* UDCCSR0_OPC is not yet raised (delta can be as big as 100ms
* from experimentation).
* - as UDCCSR0_SA can be activated while in irq handling, and clearing
* UDCCSR0_OPC would flush the setup data, we almost never clear UDCCSR0_OPC
* => we never actually read the "status stage" packet of an IN data stage
* => this is not documented in Intel documentation
* - hardware as no idea of STATUS STAGE, it only handle SETUP STAGE and DATA
* STAGE. The driver add STATUS STAGE to send last zero length packet in
* OUT_STATUS_STAGE.
* - special attention was needed for IN_STATUS_STAGE. If a packet complete
* event is detected, we terminate the status stage without ackowledging the
* packet (not to risk to loose a potential SETUP packet)
*/
static void handle_ep0(struct pxa_udc *udc, int fifo_irq, int opc_irq)
{
u32 udccsr0;
struct pxa_ep *ep = &udc->pxa_ep[0];
struct pxa27x_request *req = NULL;
int completed = 0;
if (!list_empty(&ep->queue))
req = list_entry(ep->queue.next, struct pxa27x_request, queue);
udccsr0 = udc_ep_readl(ep, UDCCSR);
ep_dbg(ep, "state=%s, req=%p, udccsr0=0x%03x, udcbcr=%d, irq_msk=%x\n",
EP0_STNAME(udc), req, udccsr0, udc_ep_readl(ep, UDCBCR),
(fifo_irq << 1 | opc_irq));
if (udccsr0 & UDCCSR0_SST) {
ep_dbg(ep, "clearing stall status\n");
nuke(ep, -EPIPE);
ep_write_UDCCSR(ep, UDCCSR0_SST);
ep0_idle(udc);
}
if (udccsr0 & UDCCSR0_SA) {
nuke(ep, 0);
set_ep0state(udc, SETUP_STAGE);
}
switch (udc->ep0state) {
case WAIT_FOR_SETUP:
/*
* Hardware bug : beware, we cannot clear OPC, since we would
* miss a potential OPC irq for a setup packet.
* So, we only do ... nothing, and hope for a next irq with
* UDCCSR0_SA set.
*/
break;
case SETUP_STAGE:
udccsr0 &= UDCCSR0_CTRL_REQ_MASK;
if (likely(udccsr0 == UDCCSR0_CTRL_REQ_MASK))
handle_ep0_ctrl_req(udc, req);
break;
case IN_DATA_STAGE: /* GET_DESCRIPTOR */
if (epout_has_pkt(ep))
ep_write_UDCCSR(ep, UDCCSR0_OPC);
if (req && !ep_is_full(ep))
completed = write_ep0_fifo(ep, req);
if (completed)
ep0_end_in_req(ep, req, NULL);
break;
case OUT_DATA_STAGE: /* SET_DESCRIPTOR */
if (epout_has_pkt(ep) && req)
completed = read_ep0_fifo(ep, req);
if (completed)
ep0_end_out_req(ep, req, NULL);
break;
case STALL:
ep_write_UDCCSR(ep, UDCCSR0_FST);
break;
case IN_STATUS_STAGE:
/*
* Hardware bug : beware, we cannot clear OPC, since we would
* miss a potential PC irq for a setup packet.
* So, we only put the ep0 into WAIT_FOR_SETUP state.
*/
if (opc_irq)
ep0_idle(udc);
break;
case OUT_STATUS_STAGE:
case WAIT_ACK_SET_CONF_INTERF:
ep_warn(ep, "should never get in %s state here!!!\n",
EP0_STNAME(ep->dev));
ep0_idle(udc);
break;
}
}
/**
* handle_ep - Handle endpoint data tranfers
* @ep: pxa physical endpoint
*
* Tries to transfer all pending request data into the endpoint and/or
* transfer all pending data in the endpoint into usb requests.
*
* Is always called when in_interrupt() and with ep->lock released.
*/
static void handle_ep(struct pxa_ep *ep)
{
struct pxa27x_request *req;
int completed;
u32 udccsr;
int is_in = ep->dir_in;
int loop = 0;
unsigned long flags;
spin_lock_irqsave(&ep->lock, flags);
if (ep->in_handle_ep)
goto recursion_detected;
ep->in_handle_ep = 1;
do {
completed = 0;
udccsr = udc_ep_readl(ep, UDCCSR);
if (likely(!list_empty(&ep->queue)))
req = list_entry(ep->queue.next,
struct pxa27x_request, queue);
else
req = NULL;
ep_dbg(ep, "req:%p, udccsr 0x%03x loop=%d\n",
req, udccsr, loop++);
if (unlikely(udccsr & (UDCCSR_SST | UDCCSR_TRN)))
udc_ep_writel(ep, UDCCSR,
udccsr & (UDCCSR_SST | UDCCSR_TRN));
if (!req)
break;
if (unlikely(is_in)) {
if (likely(!ep_is_full(ep)))
completed = write_fifo(ep, req);
} else {
if (likely(epout_has_pkt(ep)))
completed = read_fifo(ep, req);
}
if (completed) {
if (is_in)
ep_end_in_req(ep, req, &flags);
else
ep_end_out_req(ep, req, &flags);
}
} while (completed);
ep->in_handle_ep = 0;
recursion_detected:
spin_unlock_irqrestore(&ep->lock, flags);
}
/**
* pxa27x_change_configuration - Handle SET_CONF usb request notification
* @udc: udc device
* @config: usb configuration
*
* Post the request to upper level.
* Don't use any pxa specific harware configuration capabilities
*/
static void pxa27x_change_configuration(struct pxa_udc *udc, int config)
{
struct usb_ctrlrequest req ;
dev_dbg(udc->dev, "config=%d\n", config);
udc->config = config;
udc->last_interface = 0;
udc->last_alternate = 0;
req.bRequestType = 0;
req.bRequest = USB_REQ_SET_CONFIGURATION;
req.wValue = config;
req.wIndex = 0;
req.wLength = 0;
set_ep0state(udc, WAIT_ACK_SET_CONF_INTERF);
udc->driver->setup(&udc->gadget, &req);
ep_write_UDCCSR(&udc->pxa_ep[0], UDCCSR0_AREN);
}
/**
* pxa27x_change_interface - Handle SET_INTERF usb request notification
* @udc: udc device
* @iface: interface number
* @alt: alternate setting number
*
* Post the request to upper level.
* Don't use any pxa specific harware configuration capabilities
*/
static void pxa27x_change_interface(struct pxa_udc *udc, int iface, int alt)
{
struct usb_ctrlrequest req;
dev_dbg(udc->dev, "interface=%d, alternate setting=%d\n", iface, alt);
udc->last_interface = iface;
udc->last_alternate = alt;
req.bRequestType = USB_RECIP_INTERFACE;
req.bRequest = USB_REQ_SET_INTERFACE;
req.wValue = alt;
req.wIndex = iface;
req.wLength = 0;
set_ep0state(udc, WAIT_ACK_SET_CONF_INTERF);
udc->driver->setup(&udc->gadget, &req);
ep_write_UDCCSR(&udc->pxa_ep[0], UDCCSR0_AREN);
}
/*
* irq_handle_data - Handle data transfer
* @irq: irq IRQ number
* @udc: dev pxa_udc device structure
*
* Called from irq handler, transferts data to or from endpoint to queue
*/
static void irq_handle_data(int irq, struct pxa_udc *udc)
{
int i;
struct pxa_ep *ep;
u32 udcisr0 = udc_readl(udc, UDCISR0) & UDCCISR0_EP_MASK;
u32 udcisr1 = udc_readl(udc, UDCISR1) & UDCCISR1_EP_MASK;
if (udcisr0 & UDCISR_INT_MASK) {
udc->pxa_ep[0].stats.irqs++;
udc_writel(udc, UDCISR0, UDCISR_INT(0, UDCISR_INT_MASK));
handle_ep0(udc, !!(udcisr0 & UDCICR_FIFOERR),
!!(udcisr0 & UDCICR_PKTCOMPL));
}
udcisr0 >>= 2;
for (i = 1; udcisr0 != 0 && i < 16; udcisr0 >>= 2, i++) {
if (!(udcisr0 & UDCISR_INT_MASK))
continue;
udc_writel(udc, UDCISR0, UDCISR_INT(i, UDCISR_INT_MASK));
WARN_ON(i >= ARRAY_SIZE(udc->pxa_ep));
if (i < ARRAY_SIZE(udc->pxa_ep)) {
ep = &udc->pxa_ep[i];
ep->stats.irqs++;
handle_ep(ep);
}
}
for (i = 16; udcisr1 != 0 && i < 24; udcisr1 >>= 2, i++) {
udc_writel(udc, UDCISR1, UDCISR_INT(i - 16, UDCISR_INT_MASK));
if (!(udcisr1 & UDCISR_INT_MASK))
continue;
WARN_ON(i >= ARRAY_SIZE(udc->pxa_ep));
if (i < ARRAY_SIZE(udc->pxa_ep)) {
ep = &udc->pxa_ep[i];
ep->stats.irqs++;
handle_ep(ep);
}
}
}
/**
* irq_udc_suspend - Handle IRQ "UDC Suspend"
* @udc: udc device
*/
static void irq_udc_suspend(struct pxa_udc *udc)
{
udc_writel(udc, UDCISR1, UDCISR1_IRSU);
udc->stats.irqs_suspend++;
if (udc->gadget.speed != USB_SPEED_UNKNOWN
&& udc->driver && udc->driver->suspend)
udc->driver->suspend(&udc->gadget);
ep0_idle(udc);
}
/**
* irq_udc_resume - Handle IRQ "UDC Resume"
* @udc: udc device
*/
static void irq_udc_resume(struct pxa_udc *udc)
{
udc_writel(udc, UDCISR1, UDCISR1_IRRU);
udc->stats.irqs_resume++;
if (udc->gadget.speed != USB_SPEED_UNKNOWN
&& udc->driver && udc->driver->resume)
udc->driver->resume(&udc->gadget);
}
/**
* irq_udc_reconfig - Handle IRQ "UDC Change Configuration"
* @udc: udc device
*/
static void irq_udc_reconfig(struct pxa_udc *udc)
{
unsigned config, interface, alternate, config_change;
u32 udccr = udc_readl(udc, UDCCR);
udc_writel(udc, UDCISR1, UDCISR1_IRCC);
udc->stats.irqs_reconfig++;
config = (udccr & UDCCR_ACN) >> UDCCR_ACN_S;
config_change = (config != udc->config);
pxa27x_change_configuration(udc, config);
interface = (udccr & UDCCR_AIN) >> UDCCR_AIN_S;
alternate = (udccr & UDCCR_AAISN) >> UDCCR_AAISN_S;
pxa27x_change_interface(udc, interface, alternate);
if (config_change)
update_pxa_ep_matches(udc);
udc_set_mask_UDCCR(udc, UDCCR_SMAC);
}
/**
* irq_udc_reset - Handle IRQ "UDC Reset"
* @udc: udc device
*/
static void irq_udc_reset(struct pxa_udc *udc)
{
u32 udccr = udc_readl(udc, UDCCR);
struct pxa_ep *ep = &udc->pxa_ep[0];
dev_info(udc->dev, "USB reset\n");
udc_writel(udc, UDCISR1, UDCISR1_IRRS);
udc->stats.irqs_reset++;
if ((udccr & UDCCR_UDA) == 0) {
dev_dbg(udc->dev, "USB reset start\n");
stop_activity(udc, udc->driver);
}
udc->gadget.speed = USB_SPEED_FULL;
memset(&udc->stats, 0, sizeof udc->stats);
nuke(ep, -EPROTO);
ep_write_UDCCSR(ep, UDCCSR0_FTF | UDCCSR0_OPC);
ep0_idle(udc);
}
/**
* pxa_udc_irq - Main irq handler
* @irq: irq number
* @_dev: udc device
*
* Handles all udc interrupts
*/
static irqreturn_t pxa_udc_irq(int irq, void *_dev)
{
struct pxa_udc *udc = _dev;
u32 udcisr0 = udc_readl(udc, UDCISR0);
u32 udcisr1 = udc_readl(udc, UDCISR1);
u32 udccr = udc_readl(udc, UDCCR);
u32 udcisr1_spec;
dev_vdbg(udc->dev, "Interrupt, UDCISR0:0x%08x, UDCISR1:0x%08x, "
"UDCCR:0x%08x\n", udcisr0, udcisr1, udccr);
udcisr1_spec = udcisr1 & 0xf8000000;
if (unlikely(udcisr1_spec & UDCISR1_IRSU))
irq_udc_suspend(udc);
if (unlikely(udcisr1_spec & UDCISR1_IRRU))
irq_udc_resume(udc);
if (unlikely(udcisr1_spec & UDCISR1_IRCC))
irq_udc_reconfig(udc);
if (unlikely(udcisr1_spec & UDCISR1_IRRS))
irq_udc_reset(udc);
if ((udcisr0 & UDCCISR0_EP_MASK) | (udcisr1 & UDCCISR1_EP_MASK))
irq_handle_data(irq, udc);
return IRQ_HANDLED;
}
static struct pxa_udc memory = {
.gadget = {
.ops = &pxa_udc_ops,
.ep0 = &memory.udc_usb_ep[0].usb_ep,
.name = driver_name,
.dev = {
.init_name = "gadget",
},
},
.udc_usb_ep = {
USB_EP_CTRL,
USB_EP_OUT_BULK(1),
USB_EP_IN_BULK(2),
USB_EP_IN_ISO(3),
USB_EP_OUT_ISO(4),
USB_EP_IN_INT(5),
},
.pxa_ep = {
PXA_EP_CTRL,
/* Endpoints for gadget zero */
PXA_EP_OUT_BULK(1, 1, 3, 0, 0),
PXA_EP_IN_BULK(2, 2, 3, 0, 0),
/* Endpoints for ether gadget, file storage gadget */
PXA_EP_OUT_BULK(3, 1, 1, 0, 0),
PXA_EP_IN_BULK(4, 2, 1, 0, 0),
PXA_EP_IN_ISO(5, 3, 1, 0, 0),
PXA_EP_OUT_ISO(6, 4, 1, 0, 0),
PXA_EP_IN_INT(7, 5, 1, 0, 0),
/* Endpoints for RNDIS, serial */
PXA_EP_OUT_BULK(8, 1, 2, 0, 0),
PXA_EP_IN_BULK(9, 2, 2, 0, 0),
PXA_EP_IN_INT(10, 5, 2, 0, 0),
/*
* All the following endpoints are only for completion. They
* won't never work, as multiple interfaces are really broken on
* the pxa.
*/
PXA_EP_OUT_BULK(11, 1, 2, 1, 0),
PXA_EP_IN_BULK(12, 2, 2, 1, 0),
/* Endpoint for CDC Ether */
PXA_EP_OUT_BULK(13, 1, 1, 1, 1),
PXA_EP_IN_BULK(14, 2, 1, 1, 1),
}
};
/**
* pxa_udc_probe - probes the udc device
* @_dev: platform device
*
* Perform basic init : allocates udc clock, creates sysfs files, requests
* irq.
*/
static int pxa_udc_probe(struct platform_device *pdev)
{
struct resource *regs;
struct pxa_udc *udc = &memory;
int retval = 0, gpio;
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!regs)
return -ENXIO;
udc->irq = platform_get_irq(pdev, 0);
if (udc->irq < 0)
return udc->irq;
udc->dev = &pdev->dev;
udc->mach = dev_get_platdata(&pdev->dev);
udc->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
gpio = udc->mach->gpio_pullup;
if (gpio_is_valid(gpio)) {
retval = gpio_request(gpio, "USB D+ pullup");
if (retval == 0)
gpio_direction_output(gpio,
udc->mach->gpio_pullup_inverted);
}
if (retval) {
dev_err(&pdev->dev, "Couldn't request gpio %d : %d\n",
gpio, retval);
return retval;
}
udc->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(udc->clk)) {
retval = PTR_ERR(udc->clk);
goto err_clk;
}
retval = -ENOMEM;
udc->regs = ioremap(regs->start, resource_size(regs));
if (!udc->regs) {
dev_err(&pdev->dev, "Unable to map UDC I/O memory\n");
goto err_map;
}
udc->vbus_sensed = 0;
the_controller = udc;
platform_set_drvdata(pdev, udc);
udc_init_data(udc);
pxa_eps_setup(udc);
/* irq setup after old hardware state is cleaned up */
retval = request_irq(udc->irq, pxa_udc_irq,
IRQF_SHARED, driver_name, udc);
if (retval != 0) {
dev_err(udc->dev, "%s: can't get irq %i, err %d\n",
driver_name, udc->irq, retval);
goto err_irq;
}
retval = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
if (retval)
goto err_add_udc;
pxa_init_debugfs(udc);
return 0;
err_add_udc:
free_irq(udc->irq, udc);
err_irq:
iounmap(udc->regs);
err_map:
clk_put(udc->clk);
udc->clk = NULL;
err_clk:
return retval;
}
/**
* pxa_udc_remove - removes the udc device driver
* @_dev: platform device
*/
static int pxa_udc_remove(struct platform_device *_dev)
{
struct pxa_udc *udc = platform_get_drvdata(_dev);
int gpio = udc->mach->gpio_pullup;
usb_del_gadget_udc(&udc->gadget);
usb_gadget_unregister_driver(udc->driver);
free_irq(udc->irq, udc);
pxa_cleanup_debugfs(udc);
if (gpio_is_valid(gpio))
gpio_free(gpio);
usb_put_phy(udc->transceiver);
udc->transceiver = NULL;
the_controller = NULL;
clk_put(udc->clk);
iounmap(udc->regs);
return 0;
}
static void pxa_udc_shutdown(struct platform_device *_dev)
{
struct pxa_udc *udc = platform_get_drvdata(_dev);
if (udc_readl(udc, UDCCR) & UDCCR_UDE)
udc_disable(udc);
}
#ifdef CONFIG_PXA27x
extern void pxa27x_clear_otgph(void);
#else
#define pxa27x_clear_otgph() do {} while (0)
#endif
#ifdef CONFIG_PM
/**
* pxa_udc_suspend - Suspend udc device
* @_dev: platform device
* @state: suspend state
*
* Suspends udc : saves configuration registers (UDCCR*), then disables the udc
* device.
*/
static int pxa_udc_suspend(struct platform_device *_dev, pm_message_t state)
{
int i;
struct pxa_udc *udc = platform_get_drvdata(_dev);
struct pxa_ep *ep;
ep = &udc->pxa_ep[0];
udc->udccsr0 = udc_ep_readl(ep, UDCCSR);
for (i = 1; i < NR_PXA_ENDPOINTS; i++) {
ep = &udc->pxa_ep[i];
ep->udccsr_value = udc_ep_readl(ep, UDCCSR);
ep->udccr_value = udc_ep_readl(ep, UDCCR);
ep_dbg(ep, "udccsr:0x%03x, udccr:0x%x\n",
ep->udccsr_value, ep->udccr_value);
}
udc_disable(udc);
udc->pullup_resume = udc->pullup_on;
dplus_pullup(udc, 0);
return 0;
}
/**
* pxa_udc_resume - Resume udc device
* @_dev: platform device
*
* Resumes udc : restores configuration registers (UDCCR*), then enables the udc
* device.
*/
static int pxa_udc_resume(struct platform_device *_dev)
{
int i;
struct pxa_udc *udc = platform_get_drvdata(_dev);
struct pxa_ep *ep;
ep = &udc->pxa_ep[0];
udc_ep_writel(ep, UDCCSR, udc->udccsr0 & (UDCCSR0_FST | UDCCSR0_DME));
for (i = 1; i < NR_PXA_ENDPOINTS; i++) {
ep = &udc->pxa_ep[i];
udc_ep_writel(ep, UDCCSR, ep->udccsr_value);
udc_ep_writel(ep, UDCCR, ep->udccr_value);
ep_dbg(ep, "udccsr:0x%03x, udccr:0x%x\n",
ep->udccsr_value, ep->udccr_value);
}
dplus_pullup(udc, udc->pullup_resume);
if (should_enable_udc(udc))
udc_enable(udc);
/*
* We do not handle OTG yet.
*
* OTGPH bit is set when sleep mode is entered.
* it indicates that OTG pad is retaining its state.
* Upon exit from sleep mode and before clearing OTGPH,
* Software must configure the USB OTG pad, UDC, and UHC
* to the state they were in before entering sleep mode.
*/
pxa27x_clear_otgph();
return 0;
}
#endif
/* work with hotplug and coldplug */
MODULE_ALIAS("platform:pxa27x-udc");
static struct platform_driver udc_driver = {
.driver = {
.name = "pxa27x-udc",
.owner = THIS_MODULE,
},
.probe = pxa_udc_probe,
.remove = pxa_udc_remove,
.shutdown = pxa_udc_shutdown,
#ifdef CONFIG_PM
.suspend = pxa_udc_suspend,
.resume = pxa_udc_resume
#endif
};
module_platform_driver(udc_driver);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Robert Jarzmik");
MODULE_LICENSE("GPL");