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usb: gadget: at91_udc: add at91_udc into U-Boot

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add U-Boot specific changes to the at91_udc linux driver,
so it works with U-Boot.

Signed-off-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Heiko Schocher 2015-09-08 11:52:51 +02:00 committed by Andreas Bießmann
parent 8ea1fbf75c
commit 620197670a
4 changed files with 128 additions and 522 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/usb/gadget/Makefile
View File

@ -10,6 +10,7 @@ obj-$(CONFIG_USB_ETHER) += epautoconf.o config.o usbstring.o
# new USB gadget layer dependencies
ifdef CONFIG_USB_GADGET
obj-$(CONFIG_USB_GADGET_AT91) += at91_udc.o
obj-$(CONFIG_USB_GADGET_ATMEL_USBA) += atmel_usba_udc.o
obj-$(CONFIG_USB_GADGET_BCM_UDC_OTG_PHY) += bcm_udc_otg_phy.o
obj-$(CONFIG_USB_GADGET_S3C_UDC_OTG) += s3c_udc_otg.o

613
drivers/usb/gadget/at91_udc.c
View File

@ -1,43 +1,34 @@
/*
* from linux:
* c94e289f195e: usb: gadget: remove incorrect __init/__exit annotations
*
* at91_udc -- driver for at91-series USB peripheral controller
*
* Copyright (C) 2004 by Thomas Rathbone
* Copyright (C) 2005 by HP Labs
* Copyright (C) 2005 by David Brownell
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* SPDX-License-Identifier: GPL-2.0+
*/
#undef VERBOSE_DEBUG
#undef PACKET_TRACE
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <common.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <asm/hardware.h>
#include <mach/at91_matrix.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/prefetch.h>
#include <linux/clk.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/platform_data/atmel.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/atmel-matrix.h>
#include <linux/usb/at91_udc.h>
#include <malloc.h>
#include <usb/lin_gadget_compat.h>
#include "at91_udc.h"
/*
* This controller is simple and PIO-only. It's used in many AT91-series
* full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
@ -69,187 +60,12 @@ static const char * const ep_names[] = {
};
#define ep0name ep_names[0]
#define VBUS_POLL_TIMEOUT msecs_to_jiffies(1000)
#define at91_udp_read(udc, reg) \
__raw_readl((udc)->udp_baseaddr + (reg))
#define at91_udp_write(udc, reg, val) \
__raw_writel((val), (udc)->udp_baseaddr + (reg))
/*-------------------------------------------------------------------------*/
#ifdef CONFIG_USB_GADGET_DEBUG_FILES
#include <linux/seq_file.h>
static const char debug_filename[] = "driver/udc";
#define FOURBITS "%s%s%s%s"
#define EIGHTBITS FOURBITS FOURBITS
static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
{
static char *types[] = {
"control", "out-iso", "out-bulk", "out-int",
"BOGUS", "in-iso", "in-bulk", "in-int"};
u32 csr;
struct at91_request *req;
unsigned long flags;
struct at91_udc *udc = ep->udc;
spin_lock_irqsave(&udc->lock, flags);
csr = __raw_readl(ep->creg);
/* NOTE: not collecting per-endpoint irq statistics... */
seq_printf(s, "\n");
seq_printf(s, "%s, maxpacket %d %s%s %s%s\n",
ep->ep.name, ep->ep.maxpacket,
ep->is_in ? "in" : "out",
ep->is_iso ? " iso" : "",
ep->is_pingpong
? (ep->fifo_bank ? "pong" : "ping")
: "",
ep->stopped ? " stopped" : "");
seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n",
csr,
(csr & 0x07ff0000) >> 16,
(csr & (1 << 15)) ? "enabled" : "disabled",
(csr & (1 << 11)) ? "DATA1" : "DATA0",
types[(csr & 0x700) >> 8],
/* iff type is control then print current direction */
(!(csr & 0x700))
? ((csr & (1 << 7)) ? " IN" : " OUT")
: "",
(csr & (1 << 6)) ? " rxdatabk1" : "",
(csr & (1 << 5)) ? " forcestall" : "",
(csr & (1 << 4)) ? " txpktrdy" : "",
(csr & (1 << 3)) ? " stallsent" : "",
(csr & (1 << 2)) ? " rxsetup" : "",
(csr & (1 << 1)) ? " rxdatabk0" : "",
(csr & (1 << 0)) ? " txcomp" : "");
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;
seq_printf(s, "\treq %p len %d/%d buf %p\n",
&req->req, length,
req->req.length, req->req.buf);
}
spin_unlock_irqrestore(&udc->lock, flags);
}
static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
{
int i;
seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask,
(mask & (1 << 13)) ? " wakeup" : "",
(mask & (1 << 12)) ? " endbusres" : "",
(mask & (1 << 11)) ? " sofint" : "",
(mask & (1 << 10)) ? " extrsm" : "",
(mask & (1 << 9)) ? " rxrsm" : "",
(mask & (1 << 8)) ? " rxsusp" : "");
for (i = 0; i < 8; i++) {
if (mask & (1 << i))
seq_printf(s, " ep%d", i);
}
seq_printf(s, "\n");
}
static int proc_udc_show(struct seq_file *s, void *unused)
{
struct at91_udc *udc = s->private;
struct at91_ep *ep;
u32 tmp;
seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION);
seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
udc->vbus ? "present" : "off",
udc->enabled
? (udc->vbus ? "active" : "enabled")
: "disabled",
udc->gadget.is_selfpowered ? "self" : "VBUS",
udc->suspended ? ", suspended" : "",
udc->driver ? udc->driver->driver.name : "(none)");
/* don't access registers when interface isn't clocked */
if (!udc->clocked) {
seq_printf(s, "(not clocked)\n");
return 0;
}
tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM);
seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp,
(tmp & AT91_UDP_FRM_OK) ? " ok" : "",
(tmp & AT91_UDP_FRM_ERR) ? " err" : "",
(tmp & AT91_UDP_NUM));
tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp,
(tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "",
(tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "",
(tmp & AT91_UDP_ESR) ? " esr" : "",
(tmp & AT91_UDP_CONFG) ? " confg" : "",
(tmp & AT91_UDP_FADDEN) ? " fadden" : "");
tmp = at91_udp_read(udc, AT91_UDP_FADDR);
seq_printf(s, "faddr %03x:%s fadd=%d\n", tmp,
(tmp & AT91_UDP_FEN) ? " fen" : "",
(tmp & AT91_UDP_FADD));
proc_irq_show(s, "imr ", at91_udp_read(udc, AT91_UDP_IMR));
proc_irq_show(s, "isr ", at91_udp_read(udc, AT91_UDP_ISR));
if (udc->enabled && udc->vbus) {
proc_ep_show(s, &udc->ep[0]);
list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
if (ep->ep.desc)
proc_ep_show(s, ep);
}
}
return 0;
}
static int proc_udc_open(struct inode *inode, struct file *file)
{
return single_open(file, proc_udc_show, PDE_DATA(inode));
}
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_debug_file(struct at91_udc *udc)
{
udc->pde = proc_create_data(debug_filename, 0, NULL, &proc_ops, udc);
}
static void remove_debug_file(struct at91_udc *udc)
{
if (udc->pde)
remove_proc_entry(debug_filename, NULL);
}
#else
static inline void create_debug_file(struct at91_udc *udc) {}
static inline void remove_debug_file(struct at91_udc *udc) {}
#endif
static struct at91_udc *controller;
/*-------------------------------------------------------------------------*/
@ -268,7 +84,7 @@ static void done(struct at91_ep *ep, struct at91_request *req, int status)
ep->stopped = 1;
spin_unlock(&udc->lock);
usb_gadget_giveback_request(&ep->ep, &req->req);
req->req.complete(&ep->ep, &req->req);
spin_lock(&udc->lock);
ep->stopped = stopped;
@ -332,7 +148,7 @@ rescan:
req->req.status = -EOVERFLOW;
count = bufferspace;
}
__raw_readsb(dreg, buf, count);
__raw_readsb((unsigned long)dreg, buf, count);
/* release and swap pingpong mem bank */
csr |= CLR_FX;
@ -434,7 +250,7 @@ static int write_fifo(struct at91_ep *ep, struct at91_request *req)
* recover when the actual bytecount matters (e.g. for USB Test
* and Measurement Class devices).
*/
__raw_writesb(dreg, buf, count);
__raw_writesb((unsigned long)dreg, buf, count);
csr &= ~SET_FX;
csr |= CLR_FX | AT91_UDP_TXPKTRDY;
__raw_writel(csr, creg);
@ -703,14 +519,11 @@ static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
struct at91_ep *ep;
struct at91_request *req;
unsigned long flags;
struct at91_udc *udc;
ep = container_of(_ep, struct at91_ep, ep);
if (!_ep || ep->ep.name == ep0name)
return -EINVAL;
udc = ep->udc;
spin_lock_irqsave(&udc->lock, flags);
/* make sure it's actually queued on this endpoint */
@ -859,7 +672,7 @@ static void reset_gadget(struct at91_udc *udc)
}
if (driver) {
spin_unlock(&udc->lock);
usb_gadget_udc_reset(&udc->gadget, driver);
udc->driver->disconnect(&udc->gadget);
spin_lock(&udc->lock);
}
@ -895,9 +708,6 @@ static void clk_on(struct at91_udc *udc)
if (udc->clocked)
return;
udc->clocked = 1;
clk_enable(udc->iclk);
clk_enable(udc->fclk);
}
static void clk_off(struct at91_udc *udc)
@ -906,8 +716,6 @@ static void clk_off(struct at91_udc *udc)
return;
udc->clocked = 0;
udc->gadget.speed = USB_SPEED_UNKNOWN;
clk_disable(udc->fclk);
clk_disable(udc->iclk);
}
/*
@ -970,7 +778,7 @@ static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
unsigned long flags;
spin_lock_irqsave(&udc->lock, flags);
gadget->is_selfpowered = (is_on != 0);
udc->selfpowered = (is_on != 0);
spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
@ -1119,7 +927,7 @@ static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
*/
case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
| USB_REQ_GET_STATUS:
tmp = (udc->gadget.is_selfpowered << USB_DEVICE_SELF_POWERED);
tmp = (udc->selfpowered << USB_DEVICE_SELF_POWERED);
if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP);
PACKET("get device status\n");
@ -1388,9 +1196,8 @@ static void handle_ep0(struct at91_udc *udc)
}
}
static irqreturn_t at91_udc_irq (int irq, void *_udc)
static irqreturn_t at91_udc_irq(struct at91_udc *udc)
{
struct at91_udc *udc = _udc;
u32 rescans = 5;
int disable_clock = 0;
unsigned long flags;
@ -1505,67 +1312,23 @@ static irqreturn_t at91_udc_irq (int irq, void *_udc)
/*-------------------------------------------------------------------------*/
static void at91_vbus_update(struct at91_udc *udc, unsigned value)
{
value ^= udc->board.vbus_active_low;
if (value != udc->vbus)
at91_vbus_session(&udc->gadget, value);
}
static irqreturn_t at91_vbus_irq(int irq, void *_udc)
{
struct at91_udc *udc = _udc;
/* vbus needs at least brief debouncing */
udelay(10);
at91_vbus_update(udc, gpio_get_value(udc->board.vbus_pin));
return IRQ_HANDLED;
}
static void at91_vbus_timer_work(struct work_struct *work)
{
struct at91_udc *udc = container_of(work, struct at91_udc,
vbus_timer_work);
at91_vbus_update(udc, gpio_get_value_cansleep(udc->board.vbus_pin));
if (!timer_pending(&udc->vbus_timer))
mod_timer(&udc->vbus_timer, jiffies + VBUS_POLL_TIMEOUT);
}
static void at91_vbus_timer(unsigned long data)
{
struct at91_udc *udc = (struct at91_udc *)data;
/*
* If we are polling vbus it is likely that the gpio is on an
* bus such as i2c or spi which may sleep, so schedule some work
* to read the vbus gpio
*/
schedule_work(&udc->vbus_timer_work);
}
static int at91_start(struct usb_gadget *gadget,
struct usb_gadget_driver *driver)
{
struct at91_udc *udc;
struct at91_udc *udc = controller;
udc = container_of(gadget, struct at91_udc, gadget);
udc->driver = driver;
udc->gadget.dev.of_node = udc->pdev->dev.of_node;
udc->enabled = 1;
udc->gadget.is_selfpowered = 1;
udc->selfpowered = 1;
return 0;
}
static int at91_stop(struct usb_gadget *gadget)
{
struct at91_udc *udc;
struct at91_udc *udc = controller;
unsigned long flags;
udc = container_of(gadget, struct at91_udc, gadget);
spin_lock_irqsave(&udc->lock, flags);
udc->enabled = 0;
at91_udp_write(udc, AT91_UDP_IDR, ~0);
@ -1578,17 +1341,6 @@ static int at91_stop(struct usb_gadget *gadget)
/*-------------------------------------------------------------------------*/
static void at91udc_shutdown(struct platform_device *dev)
{
struct at91_udc *udc = platform_get_drvdata(dev);
unsigned long flags;
/* force disconnect on reboot */
spin_lock_irqsave(&udc->lock, flags);
pullup(platform_get_drvdata(dev), 0);
spin_unlock_irqrestore(&udc->lock, flags);
}
static int at91rm9200_udc_init(struct at91_udc *udc)
{
struct at91_ep *ep;
@ -1612,13 +1364,7 @@ static int at91rm9200_udc_init(struct at91_udc *udc)
}
}
if (!gpio_is_valid(udc->board.pullup_pin)) {
DBG("no D+ pullup?\n");
return -ENODEV;
}
ret = devm_gpio_request(&udc->pdev->dev, udc->board.pullup_pin,
"udc_pullup");
ret = gpio_request(udc->board.pullup_pin, "udc_pullup");
if (ret) {
DBG("D+ pullup is busy\n");
return ret;
@ -1666,6 +1412,7 @@ static int at91sam9260_udc_init(struct at91_udc *udc)
return 0;
}
#if defined(CONFIG_AT91SAM9260) || defined(CONFIG_AT91SAM9G20)
static void at91sam9260_udc_pullup(struct at91_udc *udc, int is_on)
{
u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
@ -1682,7 +1429,9 @@ static const struct at91_udc_caps at91sam9260_udc_caps = {
.init = at91sam9260_udc_init,
.pullup = at91sam9260_udc_pullup,
};
#endif
#if defined(CONFIG_AT91SAM9261)
static int at91sam9261_udc_init(struct at91_udc *udc)
{
struct at91_ep *ep;
@ -1704,8 +1453,8 @@ static int at91sam9261_udc_init(struct at91_udc *udc)
}
}
udc->matrix = syscon_regmap_lookup_by_phandle(udc->pdev->dev.of_node,
"atmel,matrix");
udc->matrix = (struct at91_matrix *)ATMEL_BASE_MATRIX;
if (IS_ERR(udc->matrix))
return PTR_ERR(udc->matrix);
@ -1716,17 +1465,18 @@ static void at91sam9261_udc_pullup(struct at91_udc *udc, int is_on)
{
u32 usbpucr = 0;
usbpucr = readl(&udc->matrix->pucr);
if (is_on)
usbpucr = AT91_MATRIX_USBPUCR_PUON;
usbpucr |= AT91_MATRIX_USBPUCR_PUON;
regmap_update_bits(udc->matrix, AT91SAM9261_MATRIX_USBPUCR,
AT91_MATRIX_USBPUCR_PUON, usbpucr);
writel(usbpucr, &udc->matrix->pucr);
}
static const struct at91_udc_caps at91sam9261_udc_caps = {
.init = at91sam9261_udc_init,
.pullup = at91sam9261_udc_pullup,
};
#endif
static int at91sam9263_udc_init(struct at91_udc *udc)
{
@ -1758,88 +1508,102 @@ static const struct at91_udc_caps at91sam9263_udc_caps = {
.pullup = at91sam9260_udc_pullup,
};
static const struct of_device_id at91_udc_dt_ids[] = {
{
.compatible = "atmel,at91rm9200-udc",
.data = &at91rm9200_udc_caps,
},
{
.compatible = "atmel,at91sam9260-udc",
.data = &at91sam9260_udc_caps,
},
{
.compatible = "atmel,at91sam9261-udc",
.data = &at91sam9261_udc_caps,
},
{
.compatible = "atmel,at91sam9263-udc",
.data = &at91sam9263_udc_caps,
},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, at91_udc_dt_ids);
static void at91udc_of_init(struct at91_udc *udc, struct device_node *np)
int usb_gadget_handle_interrupts(int index)
{
struct at91_udc_data *board = &udc->board;
const struct of_device_id *match;
enum of_gpio_flags flags;
u32 val;
struct at91_udc *udc = controller;
if (of_property_read_u32(np, "atmel,vbus-polled", &val) == 0)
board->vbus_polled = 1;
board->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0,
&flags);
board->vbus_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
board->pullup_pin = of_get_named_gpio_flags(np, "atmel,pullup-gpio", 0,
&flags);
board->pullup_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
match = of_match_node(at91_udc_dt_ids, np);
if (match)
udc->caps = match->data;
return at91_udc_irq(udc);
}
static int at91udc_probe(struct platform_device *pdev)
int usb_gadget_register_driver(struct usb_gadget_driver *driver)
{
struct at91_udc *udc = controller;
int ret;
if (!driver || !driver->bind || !driver->setup) {
printf("bad paramter\n");
return -EINVAL;
}
if (udc->driver) {
printf("UDC already has a gadget driver\n");
return -EBUSY;
}
at91_start(&udc->gadget, driver);
udc->driver = driver;
ret = driver->bind(&udc->gadget);
if (ret) {
error("driver->bind() returned %d\n", ret);
udc->driver = NULL;
}
return ret;
}
int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
{
struct at91_udc *udc = controller;
if (!driver || !driver->unbind || !driver->disconnect) {
error("bad paramter\n");
return -EINVAL;
}
driver->disconnect(&udc->gadget);
driver->unbind(&udc->gadget);
udc->driver = NULL;
at91_stop(&udc->gadget);
return 0;
}
int at91_udc_probe(struct at91_udc_data *pdata)
{
struct device *dev = &pdev->dev;
struct at91_udc *udc;
int retval;
struct resource *res;
struct at91_ep *ep;
int i;
udc = devm_kzalloc(dev, sizeof(*udc), GFP_KERNEL);
udc = kzalloc(sizeof(*udc), GFP_KERNEL);
if (!udc)
return -ENOMEM;
/* init software state */
udc->gadget.dev.parent = dev;
at91udc_of_init(udc, pdev->dev.of_node);
udc->pdev = pdev;
controller = udc;
memcpy(&udc->board, pdata, sizeof(struct at91_udc_data));
if (udc->board.vbus_pin) {
printf("%s: gpio vbus pin not supported yet.\n", __func__);
return -ENXIO;
} else {
DBG("no VBUS detection, assuming always-on\n");
udc->vbus = 1;
}
#if defined(CONFIG_AT91SAM9260) || defined(CONFIG_AT91SAM9G20)
udc->caps = &at91sam9260_udc_caps;
#endif
udc->enabled = 0;
spin_lock_init(&udc->lock);
udc->gadget.ops = &at91_udc_ops;
udc->gadget.ep0 = &udc->ep[0].ep;
udc->gadget.name = driver_name;
udc->gadget.dev.init_name = "gadget";
for (i = 0; i < NUM_ENDPOINTS; i++) {
ep = &udc->ep[i];
ep->ep.name = ep_names[i];
ep->ep.ops = &at91_ep_ops;
ep->udc = udc;
ep->int_mask = BIT(i);
ep->int_mask = (1 << i);
if (i != 0 && i != 3)
ep->is_pingpong = 1;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
udc->udp_baseaddr = devm_ioremap_resource(dev, res);
udc->udp_baseaddr = (void *)udc->board.baseaddr;
if (IS_ERR(udc->udp_baseaddr))
return PTR_ERR(udc->udp_baseaddr);
@ -1851,186 +1615,11 @@ static int at91udc_probe(struct platform_device *pdev)
udc_reinit(udc);
/* get interface and function clocks */
udc->iclk = devm_clk_get(dev, "pclk");
if (IS_ERR(udc->iclk))
return PTR_ERR(udc->iclk);
udc->fclk = devm_clk_get(dev, "hclk");
if (IS_ERR(udc->fclk))
return PTR_ERR(udc->fclk);
/* don't do anything until we have both gadget driver and VBUS */
clk_set_rate(udc->fclk, 48000000);
retval = clk_prepare(udc->fclk);
if (retval)
return retval;
retval = clk_prepare_enable(udc->iclk);
if (retval)
goto err_unprepare_fclk;
at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
/* Clear all pending interrupts - UDP may be used by bootloader. */
at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
clk_disable(udc->iclk);
/* request UDC and maybe VBUS irqs */
udc->udp_irq = platform_get_irq(pdev, 0);
retval = devm_request_irq(dev, udc->udp_irq, at91_udc_irq, 0,
driver_name, udc);
if (retval) {
DBG("request irq %d failed\n", udc->udp_irq);
goto err_unprepare_iclk;
}
if (gpio_is_valid(udc->board.vbus_pin)) {
retval = devm_gpio_request(dev, udc->board.vbus_pin,
"udc_vbus");
if (retval) {
DBG("request vbus pin failed\n");
goto err_unprepare_iclk;
}
gpio_direction_input(udc->board.vbus_pin);
/*
* Get the initial state of VBUS - we cannot expect
* a pending interrupt.
*/
udc->vbus = gpio_get_value_cansleep(udc->board.vbus_pin) ^
udc->board.vbus_active_low;
if (udc->board.vbus_polled) {
INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work);
setup_timer(&udc->vbus_timer, at91_vbus_timer,
(unsigned long)udc);
mod_timer(&udc->vbus_timer,
jiffies + VBUS_POLL_TIMEOUT);
} else {
retval = devm_request_irq(dev,
gpio_to_irq(udc->board.vbus_pin),
at91_vbus_irq, 0, driver_name, udc);
if (retval) {
DBG("request vbus irq %d failed\n",
udc->board.vbus_pin);
goto err_unprepare_iclk;
}
}
} else {
DBG("no VBUS detection, assuming always-on\n");
udc->vbus = 1;
}
retval = usb_add_gadget_udc(dev, &udc->gadget);
if (retval)
goto err_unprepare_iclk;
dev_set_drvdata(dev, udc);
device_init_wakeup(dev, 1);
create_debug_file(udc);
INFO("%s version %s\n", driver_name, DRIVER_VERSION);
return 0;
err_unprepare_iclk:
clk_unprepare(udc->iclk);
err_unprepare_fclk:
clk_unprepare(udc->fclk);
DBG("%s probe failed, %d\n", driver_name, retval);
return retval;
}
static int at91udc_remove(struct platform_device *pdev)
{
struct at91_udc *udc = platform_get_drvdata(pdev);
unsigned long flags;
DBG("remove\n");
usb_del_gadget_udc(&udc->gadget);
if (udc->driver)
return -EBUSY;
spin_lock_irqsave(&udc->lock, flags);
pullup(udc, 0);
spin_unlock_irqrestore(&udc->lock, flags);
device_init_wakeup(&pdev->dev, 0);
remove_debug_file(udc);
clk_unprepare(udc->fclk);
clk_unprepare(udc->iclk);
return 0;
}
#ifdef CONFIG_PM
static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
{
struct at91_udc *udc = platform_get_drvdata(pdev);
int wake = udc->driver && device_may_wakeup(&pdev->dev);
unsigned long flags;
/* Unless we can act normally to the host (letting it wake us up
* whenever it has work for us) force disconnect. Wakeup requires
* PLLB for USB events (signaling for reset, wakeup, or incoming
* tokens) and VBUS irqs (on systems which support them).
*/
if ((!udc->suspended && udc->addr)
|| !wake
|| at91_suspend_entering_slow_clock()) {
spin_lock_irqsave(&udc->lock, flags);
pullup(udc, 0);
wake = 0;
spin_unlock_irqrestore(&udc->lock, flags);
} else
enable_irq_wake(udc->udp_irq);
udc->active_suspend = wake;
if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled && wake)
enable_irq_wake(udc->board.vbus_pin);
return 0;
}
static int at91udc_resume(struct platform_device *pdev)
{
struct at91_udc *udc = platform_get_drvdata(pdev);
unsigned long flags;
if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled &&
udc->active_suspend)
disable_irq_wake(udc->board.vbus_pin);
/* maybe reconnect to host; if so, clocks on */
if (udc->active_suspend)
disable_irq_wake(udc->udp_irq);
else {
spin_lock_irqsave(&udc->lock, flags);
pullup(udc, 1);
spin_unlock_irqrestore(&udc->lock, flags);
}
return 0;
}
#else
#define at91udc_suspend NULL
#define at91udc_resume NULL
#endif
static struct platform_driver at91_udc_driver = {
.remove = at91udc_remove,
.shutdown = at91udc_shutdown,
.suspend = at91udc_suspend,
.resume = at91udc_resume,
.driver = {
.name = (char *) driver_name,
.of_match_table = at91_udc_dt_ids,
},
};
module_platform_driver_probe(at91_udc_driver, at91udc_probe);
MODULE_DESCRIPTION("AT91 udc driver");
MODULE_AUTHOR("Thomas Rathbone, David Brownell");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:at91_udc");

16
drivers/usb/gadget/at91_udc.h
View File

@ -128,18 +128,14 @@ struct at91_udc {
unsigned req_pending:1;
unsigned wait_for_addr_ack:1;
unsigned wait_for_config_ack:1;
unsigned selfpowered:1;
unsigned active_suspend:1;
u8 addr;
struct at91_udc_data board;
struct clk *iclk, *fclk;
struct platform_device *pdev;
struct proc_dir_entry *pde;
void __iomem *udp_baseaddr;
int udp_irq;
spinlock_t lock;
struct timer_list vbus_timer;
struct work_struct vbus_timer_work;
struct regmap *matrix;
struct at91_matrix *matrix;
};
static inline struct at91_udc *to_udc(struct usb_gadget *g)
@ -166,10 +162,10 @@ struct at91_request {
# define PACKET(stuff...) do{}while(0)
#endif
#define ERR(stuff...) pr_err("udc: " stuff)
#define WARNING(stuff...) pr_warning("udc: " stuff)
#define INFO(stuff...) pr_info("udc: " stuff)
#define DBG(stuff...) pr_debug("udc: " stuff)
#define ERR(stuff...) debug("udc: " stuff)
#define WARNING(stuff...) debug("udc: " stuff)
#define INFO(stuff...) debug("udc: " stuff)
#define DBG(stuff...) debug("udc: " stuff)
#endif

20
include/linux/usb/at91_udc.h Normal file
View File

@ -0,0 +1,20 @@
/*
* Platform data definitions for Atmel USBA gadget driver
* pieces copied from linux:include/linux/platform_data/atmel.h
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __LINUX_USB_AT91_UDC_H__
#define __LINUX_USB_AT91_UDC_H__
struct at91_udc_data {
int vbus_pin; /* high == host powering us */
u8 vbus_active_low; /* vbus polarity */
u8 vbus_polled; /* Use polling, not interrupt */
int pullup_pin; /* active == D+ pulled up */
u8 pullup_active_low; /* true == pullup_pin is active low */
unsigned long baseaddr;
};
int at91_udc_probe(struct at91_udc_data *pdata);
#endif /* __LINUX_USB_AT91_UDC_H__ */