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path: root/drivers/usb/gadget/at91_udc.c
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Diffstat (limited to 'drivers/usb/gadget/at91_udc.c')
-rw-r--r--drivers/usb/gadget/at91_udc.c535
1 files changed, 317 insertions, 218 deletions
diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c
index a83e8b798ec..cfd18bcca72 100644
--- a/drivers/usb/gadget/at91_udc.c
+++ b/drivers/usb/gadget/at91_udc.c
@@ -9,16 +9,6 @@
* 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 VERBOSE_DEBUG
@@ -31,25 +21,26 @@
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/errno.h>
-#include <linux/init.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 <asm/byteorder.h>
-#include <asm/hardware.h>
+#include <mach/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
-#include <asm/system.h>
-#include <asm/mach-types.h>
#include <asm/gpio.h>
-#include <asm/arch/board.h>
-#include <asm/arch/cpu.h>
-#include <asm/arch/at91sam9261_matrix.h>
+#include <mach/cpu.h>
+#include <mach/at91sam9261_matrix.h>
+#include <mach/at91_matrix.h>
#include "at91_udc.h"
@@ -59,7 +50,7 @@
* full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
* at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
*
- * This driver expects the board has been wired with two GPIOs suppporting
+ * This driver expects the board has been wired with two GPIOs supporting
* a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the
* testing hasn't covered such cases.)
*
@@ -77,11 +68,12 @@
static const char driver_name [] = "at91_udc";
static const char ep0name[] = "ep0";
+#define VBUS_POLL_TIMEOUT msecs_to_jiffies(1000)
-#define at91_udp_read(dev, reg) \
- __raw_readl((dev)->udp_baseaddr + (reg))
-#define at91_udp_write(dev, reg, val) \
- __raw_writel((val), (dev)->udp_baseaddr + (reg))
+#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))
/*-------------------------------------------------------------------------*/
@@ -103,8 +95,9 @@ static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
u32 csr;
struct at91_request *req;
unsigned long flags;
+ struct at91_udc *udc = ep->udc;
- local_irq_save(flags);
+ spin_lock_irqsave(&udc->lock, flags);
csr = __raw_readl(ep->creg);
@@ -148,7 +141,7 @@ static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
&req->req, length,
req->req.length, req->req.buf);
}
- local_irq_restore(flags);
+ spin_unlock_irqrestore(&udc->lock, flags);
}
static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
@@ -218,7 +211,7 @@ static int proc_udc_show(struct seq_file *s, void *unused)
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->desc)
+ if (ep->ep.desc)
proc_ep_show(s, ep);
}
}
@@ -227,10 +220,11 @@ static int proc_udc_show(struct seq_file *s, void *unused)
static int proc_udc_open(struct inode *inode, struct file *file)
{
- return single_open(file, proc_udc_show, PDE(inode)->data);
+ 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,
@@ -239,15 +233,7 @@ static const struct file_operations proc_ops = {
static void create_debug_file(struct at91_udc *udc)
{
- struct proc_dir_entry *pde;
-
- pde = create_proc_entry (debug_filename, 0, NULL);
- udc->pde = pde;
- if (pde == NULL)
- return;
-
- pde->proc_fops = &proc_ops;
- pde->data = udc;
+ udc->pde = proc_create_data(debug_filename, 0, NULL, &proc_ops, udc);
}
static void remove_debug_file(struct at91_udc *udc)
@@ -280,7 +266,9 @@ static void done(struct at91_ep *ep, struct at91_request *req, int status)
VDBG("%s done %p, status %d\n", ep->ep.name, req, status);
ep->stopped = 1;
+ spin_unlock(&udc->lock);
req->req.complete(&ep->ep, &req->req);
+ spin_lock(&udc->lock);
ep->stopped = stopped;
/* ep0 is always ready; other endpoints need a non-empty queue */
@@ -374,6 +362,13 @@ rescan:
if (is_done)
done(ep, req, 0);
else if (ep->is_pingpong) {
+ /*
+ * One dummy read to delay the code because of a HW glitch:
+ * CSR returns bad RXCOUNT when read too soon after updating
+ * RX_DATA_BK flags.
+ */
+ csr = __raw_readl(creg);
+
bufferspace -= count;
buf += count;
goto rescan;
@@ -389,6 +384,7 @@ static int write_fifo(struct at91_ep *ep, struct at91_request *req)
u32 csr = __raw_readl(creg);
u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
unsigned total, count, is_last;
+ u8 *buf;
/*
* TODO: allow for writing two packets to the fifo ... that'll
@@ -413,6 +409,8 @@ static int write_fifo(struct at91_ep *ep, struct at91_request *req)
return 0;
}
+ buf = req->req.buf + req->req.actual;
+ prefetch(buf);
total = req->req.length - req->req.actual;
if (ep->ep.maxpacket < total) {
count = ep->ep.maxpacket;
@@ -435,7 +433,7 @@ 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, req->req.buf + req->req.actual, count);
+ __raw_writesb(dreg, buf, count);
csr &= ~SET_FX;
csr |= CLR_FX | AT91_UDP_TXPKTRDY;
__raw_writel(csr, creg);
@@ -452,12 +450,12 @@ static void nuke(struct at91_ep *ep, int status)
{
struct at91_request *req;
- // terminer chaque requete dans la queue
+ /* terminate any request in the queue */
ep->stopped = 1;
if (list_empty(&ep->queue))
return;
- VDBG("%s %s\n", __FUNCTION__, ep->ep.name);
+ VDBG("%s %s\n", __func__, ep->ep.name);
while (!list_empty(&ep->queue)) {
req = list_entry(ep->queue.next, struct at91_request, queue);
done(ep, req, status);
@@ -470,27 +468,27 @@ static int at91_ep_enable(struct usb_ep *_ep,
const struct usb_endpoint_descriptor *desc)
{
struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
- struct at91_udc *dev = ep->udc;
+ struct at91_udc *udc;
u16 maxpacket;
u32 tmp;
unsigned long flags;
if (!_ep || !ep
- || !desc || ep->desc
- || _ep->name == ep0name
+ || !desc || _ep->name == ep0name
|| desc->bDescriptorType != USB_DT_ENDPOINT
- || (maxpacket = le16_to_cpu(desc->wMaxPacketSize)) == 0
+ || (maxpacket = usb_endpoint_maxp(desc)) == 0
|| maxpacket > ep->maxpacket) {
DBG("bad ep or descriptor\n");
return -EINVAL;
}
- if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
+ udc = ep->udc;
+ if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
DBG("bogus device state\n");
return -ESHUTDOWN;
}
- tmp = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
+ tmp = usb_endpoint_type(desc);
switch (tmp) {
case USB_ENDPOINT_XFER_CONTROL:
DBG("only one control endpoint\n");
@@ -519,10 +517,10 @@ bogus_max:
}
ok:
- local_irq_save(flags);
+ spin_lock_irqsave(&udc->lock, flags);
/* initialize endpoint to match this descriptor */
- ep->is_in = (desc->bEndpointAddress & USB_DIR_IN) != 0;
+ ep->is_in = usb_endpoint_dir_in(desc);
ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
ep->stopped = 0;
if (ep->is_in)
@@ -531,17 +529,16 @@ ok:
tmp |= AT91_UDP_EPEDS;
__raw_writel(tmp, ep->creg);
- ep->desc = desc;
ep->ep.maxpacket = maxpacket;
/*
* reset/init endpoint fifo. NOTE: leaves fifo_bank alone,
* since endpoint resets don't reset hw pingpong state.
*/
- at91_udp_write(dev, AT91_UDP_RST_EP, ep->int_mask);
- at91_udp_write(dev, AT91_UDP_RST_EP, 0);
+ at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
+ at91_udp_write(udc, AT91_UDP_RST_EP, 0);
- local_irq_restore(flags);
+ spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
@@ -554,12 +551,12 @@ static int at91_ep_disable (struct usb_ep * _ep)
if (ep == &ep->udc->ep[0])
return -EINVAL;
- local_irq_save(flags);
+ spin_lock_irqsave(&udc->lock, flags);
nuke(ep, -ESHUTDOWN);
/* restore the endpoint's pristine config */
- ep->desc = NULL;
+ ep->ep.desc = NULL;
ep->ep.maxpacket = ep->maxpacket;
/* reset fifos and endpoint */
@@ -569,7 +566,7 @@ static int at91_ep_disable (struct usb_ep * _ep)
__raw_writel(0, ep->creg);
}
- local_irq_restore(flags);
+ spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
@@ -605,7 +602,7 @@ static int at91_ep_queue(struct usb_ep *_ep,
{
struct at91_request *req;
struct at91_ep *ep;
- struct at91_udc *dev;
+ struct at91_udc *udc;
int status;
unsigned long flags;
@@ -618,14 +615,14 @@ static int at91_ep_queue(struct usb_ep *_ep,
return -EINVAL;
}
- if (!_ep || (!ep->desc && ep->ep.name != ep0name)) {
+ if (!_ep || (!ep->ep.desc && ep->ep.name != ep0name)) {
DBG("invalid ep\n");
return -EINVAL;
}
- dev = ep->udc;
+ udc = ep->udc;
- if (!dev || !dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
+ if (!udc || !udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
DBG("invalid device\n");
return -EINVAL;
}
@@ -633,7 +630,7 @@ static int at91_ep_queue(struct usb_ep *_ep,
_req->status = -EINPROGRESS;
_req->actual = 0;
- local_irq_save(flags);
+ spin_lock_irqsave(&udc->lock, flags);
/* try to kickstart any empty and idle queue */
if (list_empty(&ep->queue) && !ep->stopped) {
@@ -651,7 +648,7 @@ static int at91_ep_queue(struct usb_ep *_ep,
if (is_ep0) {
u32 tmp;
- if (!dev->req_pending) {
+ if (!udc->req_pending) {
status = -EINVAL;
goto done;
}
@@ -660,11 +657,11 @@ static int at91_ep_queue(struct usb_ep *_ep,
* defer changing CONFG until after the gadget driver
* reconfigures the endpoints.
*/
- if (dev->wait_for_config_ack) {
- tmp = at91_udp_read(dev, AT91_UDP_GLB_STAT);
+ if (udc->wait_for_config_ack) {
+ tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
tmp ^= AT91_UDP_CONFG;
VDBG("toggle config\n");
- at91_udp_write(dev, AT91_UDP_GLB_STAT, tmp);
+ at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
}
if (req->req.length == 0) {
ep0_in_status:
@@ -674,7 +671,7 @@ ep0_in_status:
tmp &= ~SET_FX;
tmp |= CLR_FX | AT91_UDP_TXPKTRDY;
__raw_writel(tmp, ep->creg);
- dev->req_pending = 0;
+ udc->req_pending = 0;
goto done;
}
}
@@ -693,31 +690,40 @@ ep0_in_status:
if (req && !status) {
list_add_tail (&req->queue, &ep->queue);
- at91_udp_write(dev, AT91_UDP_IER, ep->int_mask);
+ at91_udp_write(udc, AT91_UDP_IER, ep->int_mask);
}
done:
- local_irq_restore(flags);
+ spin_unlock_irqrestore(&udc->lock, flags);
return (status < 0) ? status : 0;
}
static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
{
- struct at91_ep *ep;
+ 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 */
list_for_each_entry (req, &ep->queue, queue) {
if (&req->req == _req)
break;
}
- if (&req->req != _req)
+ if (&req->req != _req) {
+ spin_unlock_irqrestore(&udc->lock, flags);
return -EINVAL;
+ }
done(ep, req, -ECONNRESET);
+ spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
@@ -734,7 +740,7 @@ static int at91_ep_set_halt(struct usb_ep *_ep, int value)
return -EINVAL;
creg = ep->creg;
- local_irq_save(flags);
+ spin_lock_irqsave(&udc->lock, flags);
csr = __raw_readl(creg);
@@ -759,7 +765,7 @@ static int at91_ep_set_halt(struct usb_ep *_ep, int value)
__raw_writel(csr, creg);
}
- local_irq_restore(flags);
+ spin_unlock_irqrestore(&udc->lock, flags);
return status;
}
@@ -771,7 +777,7 @@ static const struct usb_ep_ops at91_ep_ops = {
.queue = at91_ep_queue,
.dequeue = at91_ep_dequeue,
.set_halt = at91_ep_set_halt,
- // there's only imprecise fifo status reporting
+ /* there's only imprecise fifo status reporting */
};
/*-------------------------------------------------------------------------*/
@@ -792,8 +798,8 @@ static int at91_wakeup(struct usb_gadget *gadget)
int status = -EINVAL;
unsigned long flags;
- DBG("%s\n", __FUNCTION__ );
- local_irq_save(flags);
+ DBG("%s\n", __func__ );
+ spin_lock_irqsave(&udc->lock, flags);
if (!udc->clocked || !udc->suspended)
goto done;
@@ -807,11 +813,11 @@ static int at91_wakeup(struct usb_gadget *gadget)
at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate);
done:
- local_irq_restore(flags);
+ spin_unlock_irqrestore(&udc->lock, flags);
return status;
}
-/* reinit == restore inital software state */
+/* reinit == restore initial software state */
static void udc_reinit(struct at91_udc *udc)
{
u32 i;
@@ -824,12 +830,12 @@ static void udc_reinit(struct at91_udc *udc)
if (i != 0)
list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
- ep->desc = NULL;
+ ep->ep.desc = NULL;
ep->stopped = 0;
ep->fifo_bank = 0;
- ep->ep.maxpacket = ep->maxpacket;
+ usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket);
ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
- // initialiser une queue par endpoint
+ /* initialize one queue per endpoint */
INIT_LIST_HEAD(&ep->queue);
}
}
@@ -849,8 +855,11 @@ static void stop_activity(struct at91_udc *udc)
ep->stopped = 1;
nuke(ep, -ESHUTDOWN);
}
- if (driver)
+ if (driver) {
+ spin_unlock(&udc->lock);
driver->disconnect(&udc->gadget);
+ spin_lock(&udc->lock);
+ }
udc_reinit(udc);
}
@@ -860,8 +869,13 @@ static void clk_on(struct at91_udc *udc)
if (udc->clocked)
return;
udc->clocked = 1;
- clk_enable(udc->iclk);
- clk_enable(udc->fclk);
+
+ if (IS_ENABLED(CONFIG_COMMON_CLK)) {
+ clk_set_rate(udc->uclk, 48000000);
+ clk_prepare_enable(udc->uclk);
+ }
+ clk_prepare_enable(udc->iclk);
+ clk_prepare_enable(udc->fclk);
}
static void clk_off(struct at91_udc *udc)
@@ -870,8 +884,10 @@ 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);
+ clk_disable_unprepare(udc->fclk);
+ clk_disable_unprepare(udc->iclk);
+ if (IS_ENABLED(CONFIG_COMMON_CLK))
+ clk_disable_unprepare(udc->uclk);
}
/*
@@ -892,17 +908,17 @@ static void pullup(struct at91_udc *udc, int is_on)
at91_udp_write(udc, AT91_UDP_TXVC, 0);
if (cpu_is_at91rm9200())
gpio_set_value(udc->board.pullup_pin, active);
- else if (cpu_is_at91sam9260() || cpu_is_at91sam9263()) {
+ else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
txvc |= AT91_UDP_TXVC_PUON;
at91_udp_write(udc, AT91_UDP_TXVC, txvc);
- } else if (cpu_is_at91sam9261()) {
+ } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
u32 usbpucr;
- usbpucr = at91_sys_read(AT91_MATRIX_USBPUCR);
+ usbpucr = at91_matrix_read(AT91_MATRIX_USBPUCR);
usbpucr |= AT91_MATRIX_USBPUCR_PUON;
- at91_sys_write(AT91_MATRIX_USBPUCR, usbpucr);
+ at91_matrix_write(AT91_MATRIX_USBPUCR, usbpucr);
}
} else {
stop_activity(udc);
@@ -910,17 +926,17 @@ static void pullup(struct at91_udc *udc, int is_on)
at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
if (cpu_is_at91rm9200())
gpio_set_value(udc->board.pullup_pin, !active);
- else if (cpu_is_at91sam9260() || cpu_is_at91sam9263()) {
+ else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
txvc &= ~AT91_UDP_TXVC_PUON;
at91_udp_write(udc, AT91_UDP_TXVC, txvc);
- } else if (cpu_is_at91sam9261()) {
+ } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
u32 usbpucr;
- usbpucr = at91_sys_read(AT91_MATRIX_USBPUCR);
+ usbpucr = at91_matrix_read(AT91_MATRIX_USBPUCR);
usbpucr &= ~AT91_MATRIX_USBPUCR_PUON;
- at91_sys_write(AT91_MATRIX_USBPUCR, usbpucr);
+ at91_matrix_write(AT91_MATRIX_USBPUCR, usbpucr);
}
clk_off(udc);
}
@@ -932,14 +948,14 @@ static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
struct at91_udc *udc = to_udc(gadget);
unsigned long flags;
- // VDBG("vbus %s\n", is_active ? "on" : "off");
- local_irq_save(flags);
+ /* VDBG("vbus %s\n", is_active ? "on" : "off"); */
+ spin_lock_irqsave(&udc->lock, flags);
udc->vbus = (is_active != 0);
if (udc->driver)
pullup(udc, is_active);
else
pullup(udc, 0);
- local_irq_restore(flags);
+ spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
@@ -948,10 +964,10 @@ static int at91_pullup(struct usb_gadget *gadget, int is_on)
struct at91_udc *udc = to_udc(gadget);
unsigned long flags;
- local_irq_save(flags);
+ spin_lock_irqsave(&udc->lock, flags);
udc->enabled = is_on = !!is_on;
pullup(udc, is_on);
- local_irq_restore(flags);
+ spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
@@ -960,24 +976,30 @@ static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
struct at91_udc *udc = to_udc(gadget);
unsigned long flags;
- local_irq_save(flags);
+ spin_lock_irqsave(&udc->lock, flags);
udc->selfpowered = (is_on != 0);
- local_irq_restore(flags);
+ spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
+static int at91_start(struct usb_gadget *gadget,
+ struct usb_gadget_driver *driver);
+static int at91_stop(struct usb_gadget *gadget,
+ struct usb_gadget_driver *driver);
static const struct usb_gadget_ops at91_udc_ops = {
.get_frame = at91_get_frame,
.wakeup = at91_wakeup,
.set_selfpowered = at91_set_selfpowered,
.vbus_session = at91_vbus_session,
.pullup = at91_pullup,
+ .udc_start = at91_start,
+ .udc_stop = at91_stop,
/*
* VBUS-powered devices may also also want to support bigger
* power budgets after an appropriate SET_CONFIGURATION.
*/
- // .vbus_power = at91_vbus_power,
+ /* .vbus_power = at91_vbus_power, */
};
/*-------------------------------------------------------------------------*/
@@ -1046,7 +1068,7 @@ static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
ep->is_in = 0;
}
} else {
- // REVISIT this happens sometimes under load; why??
+ /* REVISIT this happens sometimes under load; why?? */
ERR("SETUP len %d, csr %08x\n", rxcount, csr);
status = -EINVAL;
}
@@ -1154,7 +1176,7 @@ static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
| USB_REQ_GET_STATUS:
tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
ep = &udc->ep[tmp];
- if (tmp >= NUM_ENDPOINTS || (tmp && !ep->desc))
+ if (tmp >= NUM_ENDPOINTS || (tmp && !ep->ep.desc))
goto stall;
if (tmp) {
@@ -1179,7 +1201,7 @@ static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
ep = &udc->ep[tmp];
if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
goto stall;
- if (!ep->desc || ep->is_iso)
+ if (!ep->ep.desc || ep->is_iso)
goto stall;
if ((w_index & USB_DIR_IN)) {
if (!ep->is_in)
@@ -1200,7 +1222,7 @@ static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
goto stall;
if (tmp == 0)
goto succeed;
- if (!ep->desc || ep->is_iso)
+ if (!ep->ep.desc || ep->is_iso)
goto stall;
if ((w_index & USB_DIR_IN)) {
if (!ep->is_in)
@@ -1224,8 +1246,11 @@ static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
#undef w_length
/* pass request up to the gadget driver */
- if (udc->driver)
+ if (udc->driver) {
+ spin_unlock(&udc->lock);
status = udc->driver->setup(&udc->gadget, &pkt.r);
+ spin_lock(&udc->lock);
+ }
else
status = -ENODEV;
if (status < 0) {
@@ -1245,7 +1270,6 @@ write_in:
csr |= AT91_UDP_TXPKTRDY;
__raw_writel(csr, creg);
udc->req_pending = 0;
- return;
}
static void handle_ep0(struct at91_udc *udc)
@@ -1375,6 +1399,15 @@ static irqreturn_t at91_udc_irq (int irq, void *_udc)
{
struct at91_udc *udc = _udc;
u32 rescans = 5;
+ int disable_clock = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ if (!udc->clocked) {
+ clk_on(udc);
+ disable_clock = 1;
+ }
while (rescans--) {
u32 status;
@@ -1414,7 +1447,7 @@ static irqreturn_t at91_udc_irq (int irq, void *_udc)
at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP);
at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM);
at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP);
- // VDBG("bus suspend\n");
+ /* VDBG("bus suspend\n"); */
if (udc->suspended)
continue;
udc->suspended = 1;
@@ -1425,15 +1458,18 @@ static irqreturn_t at91_udc_irq (int irq, void *_udc)
* and then into standby to avoid drawing more than
* 500uA power (2500uA for some high-power configs).
*/
- if (udc->driver && udc->driver->suspend)
+ if (udc->driver && udc->driver->suspend) {
+ spin_unlock(&udc->lock);
udc->driver->suspend(&udc->gadget);
+ spin_lock(&udc->lock);
+ }
/* host initiated resume */
} else if (status & AT91_UDP_RXRSM) {
at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);
at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
- // VDBG("bus resume\n");
+ /* VDBG("bus resume\n"); */
if (!udc->suspended)
continue;
udc->suspended = 0;
@@ -1443,8 +1479,11 @@ static irqreturn_t at91_udc_irq (int irq, void *_udc)
* would normally want to switch out of slow clock
* mode into normal mode.
*/
- if (udc->driver && udc->driver->resume)
+ if (udc->driver && udc->driver->resume) {
+ spin_unlock(&udc->lock);
udc->driver->resume(&udc->gadget);
+ spin_lock(&udc->lock);
+ }
/* endpoint IRQs are cleared by handling them */
} else {
@@ -1463,6 +1502,11 @@ static irqreturn_t at91_udc_irq (int irq, void *_udc)
}
}
+ if (disable_clock)
+ clk_off(udc);
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+
return IRQ_HANDLED;
}
@@ -1479,7 +1523,7 @@ static struct at91_udc controller = {
.ep0 = &controller.ep[0].ep,
.name = driver_name,
.dev = {
- .bus_id = "gadget",
+ .init_name = "gadget",
.release = nop_release,
}
},
@@ -1545,125 +1589,131 @@ static struct at91_udc controller = {
/* ep6 and ep7 are also reserved (custom silicon might use them) */
};
+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;
- unsigned value;
/* vbus needs at least brief debouncing */
udelay(10);
- value = gpio_get_value(udc->board.vbus_pin);
- if (value != udc->vbus)
- at91_vbus_session(&udc->gadget, value);
+ at91_vbus_update(udc, gpio_get_value(udc->board.vbus_pin));
return IRQ_HANDLED;
}
-int usb_gadget_register_driver (struct usb_gadget_driver *driver)
+static void at91_vbus_timer_work(struct work_struct *work)
{
- struct at91_udc *udc = &controller;
- int retval;
+ struct at91_udc *udc = container_of(work, struct at91_udc,
+ vbus_timer_work);
- if (!driver
- || driver->speed < USB_SPEED_FULL
- || !driver->bind
- || !driver->setup) {
- DBG("bad parameter.\n");
- return -EINVAL;
- }
+ at91_vbus_update(udc, gpio_get_value_cansleep(udc->board.vbus_pin));
- if (udc->driver) {
- DBG("UDC already has a gadget driver\n");
- return -EBUSY;
- }
+ 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;
+ udc = container_of(gadget, struct at91_udc, gadget);
udc->driver = driver;
- udc->gadget.dev.driver = &driver->driver;
- udc->gadget.dev.driver_data = &driver->driver;
+ udc->gadget.dev.of_node = udc->pdev->dev.of_node;
udc->enabled = 1;
udc->selfpowered = 1;
- retval = driver->bind(&udc->gadget);
- if (retval) {
- DBG("driver->bind() returned %d\n", retval);
- udc->driver = NULL;
- udc->gadget.dev.driver = NULL;
- udc->gadget.dev.driver_data = NULL;
- udc->enabled = 0;
- udc->selfpowered = 0;
- return retval;
- }
-
- local_irq_disable();
- pullup(udc, 1);
- local_irq_enable();
-
DBG("bound to %s\n", driver->driver.name);
return 0;
}
-EXPORT_SYMBOL (usb_gadget_register_driver);
-int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
+static int at91_stop(struct usb_gadget *gadget,
+ struct usb_gadget_driver *driver)
{
- struct at91_udc *udc = &controller;
-
- if (!driver || driver != udc->driver || !driver->unbind)
- return -EINVAL;
+ struct at91_udc *udc;
+ unsigned long flags;
- local_irq_disable();
+ 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);
- pullup(udc, 0);
- local_irq_enable();
+ spin_unlock_irqrestore(&udc->lock, flags);
- driver->unbind(&udc->gadget);
- udc->gadget.dev.driver = NULL;
- udc->gadget.dev.driver_data = NULL;
udc->driver = NULL;
DBG("unbound from %s\n", driver->driver.name);
return 0;
}
-EXPORT_SYMBOL (usb_gadget_unregister_driver);
/*-------------------------------------------------------------------------*/
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 __init at91udc_probe(struct platform_device *pdev)
+static void at91udc_of_init(struct at91_udc *udc,
+ struct device_node *np)
+{
+ struct at91_udc_data *board = &udc->board;
+ u32 val;
+ enum of_gpio_flags flags;
+
+ 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;
+}
+
+static int at91udc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct at91_udc *udc;
int retval;
struct resource *res;
- if (!dev->platform_data) {
+ if (!dev_get_platdata(dev) && !pdev->dev.of_node) {
/* small (so we copy it) but critical! */
DBG("missing platform_data\n");
return -ENODEV;
}
- if (pdev->num_resources != 2) {
- DBG("invalid num_resources\n");
- return -ENODEV;
- }
- if ((pdev->resource[0].flags != IORESOURCE_MEM)
- || (pdev->resource[1].flags != IORESOURCE_IRQ)) {
- DBG("invalid resource type\n");
- return -ENODEV;
- }
-
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENXIO;
- if (!request_mem_region(res->start,
- res->end - res->start + 1,
- driver_name)) {
+ if (!request_mem_region(res->start, resource_size(res), driver_name)) {
DBG("someone's using UDC memory\n");
return -EBUSY;
}
@@ -1671,13 +1721,18 @@ static int __init at91udc_probe(struct platform_device *pdev)
/* init software state */
udc = &controller;
udc->gadget.dev.parent = dev;
- udc->board = *(struct at91_udc_data *) dev->platform_data;
+ if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node)
+ at91udc_of_init(udc, pdev->dev.of_node);
+ else
+ memcpy(&udc->board, dev_get_platdata(dev),
+ sizeof(struct at91_udc_data));
udc->pdev = pdev;
udc->enabled = 0;
+ spin_lock_init(&udc->lock);
/* rm9200 needs manual D+ pullup; off by default */
if (cpu_is_at91rm9200()) {
- if (udc->board.pullup_pin <= 0) {
+ if (!gpio_is_valid(udc->board.pullup_pin)) {
DBG("no D+ pullup?\n");
retval = -ENODEV;
goto fail0;
@@ -1691,7 +1746,20 @@ static int __init at91udc_probe(struct platform_device *pdev)
udc->board.pullup_active_low);
}
- udc->udp_baseaddr = ioremap(res->start, res->end - res->start + 1);
+ /* newer chips have more FIFO memory than rm9200 */
+ if (cpu_is_at91sam9260() || cpu_is_at91sam9g20()) {
+ udc->ep[0].maxpacket = 64;
+ udc->ep[3].maxpacket = 64;
+ udc->ep[4].maxpacket = 512;
+ udc->ep[5].maxpacket = 512;
+ } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
+ udc->ep[3].maxpacket = 64;
+ } else if (cpu_is_at91sam9263()) {
+ udc->ep[0].maxpacket = 64;
+ udc->ep[3].maxpacket = 64;
+ }
+
+ udc->udp_baseaddr = ioremap(res->start, resource_size(res));
if (!udc->udp_baseaddr) {
retval = -ENOMEM;
goto fail0a;
@@ -1702,34 +1770,34 @@ static int __init at91udc_probe(struct platform_device *pdev)
/* get interface and function clocks */
udc->iclk = clk_get(dev, "udc_clk");
udc->fclk = clk_get(dev, "udpck");
- if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk)) {
+ if (IS_ENABLED(CONFIG_COMMON_CLK))
+ udc->uclk = clk_get(dev, "usb_clk");
+ if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk) ||
+ (IS_ENABLED(CONFIG_COMMON_CLK) && IS_ERR(udc->uclk))) {
DBG("clocks missing\n");
retval = -ENODEV;
- /* NOTE: we "know" here that refcounts on these are NOPs */
- goto fail0b;
+ goto fail1;
}
- retval = device_register(&udc->gadget.dev);
- if (retval < 0)
- goto fail0b;
-
/* don't do anything until we have both gadget driver and VBUS */
- clk_enable(udc->iclk);
+ retval = clk_prepare_enable(udc->iclk);
+ if (retval)
+ goto fail1;
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);
+ clk_disable_unprepare(udc->iclk);
/* request UDC and maybe VBUS irqs */
udc->udp_irq = platform_get_irq(pdev, 0);
retval = request_irq(udc->udp_irq, at91_udc_irq,
- IRQF_DISABLED, driver_name, udc);
+ 0, driver_name, udc);
if (retval < 0) {
DBG("request irq %d failed\n", udc->udp_irq);
goto fail1;
}
- if (udc->board.vbus_pin > 0) {
+ if (gpio_is_valid(udc->board.vbus_pin)) {
retval = gpio_request(udc->board.vbus_pin, "udc_vbus");
if (retval < 0) {
DBG("request vbus pin failed\n");
@@ -1741,40 +1809,58 @@ static int __init at91udc_probe(struct platform_device *pdev)
* Get the initial state of VBUS - we cannot expect
* a pending interrupt.
*/
- udc->vbus = gpio_get_value(udc->board.vbus_pin);
- if (request_irq(udc->board.vbus_pin, at91_vbus_irq,
- IRQF_DISABLED, driver_name, udc)) {
- DBG("request vbus irq %d failed\n",
- udc->board.vbus_pin);
- free_irq(udc->udp_irq, udc);
- retval = -EBUSY;
- goto fail3;
+ 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 {
+ if (request_irq(gpio_to_irq(udc->board.vbus_pin),
+ at91_vbus_irq, 0, driver_name, udc)) {
+ DBG("request vbus irq %d failed\n",
+ udc->board.vbus_pin);
+ retval = -EBUSY;
+ goto fail3;
+ }
}
} else {
DBG("no VBUS detection, assuming always-on\n");
udc->vbus = 1;
}
+ retval = usb_add_gadget_udc(dev, &udc->gadget);
+ if (retval)
+ goto fail4;
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;
-
+fail4:
+ if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled)
+ free_irq(gpio_to_irq(udc->board.vbus_pin), udc);
fail3:
- if (udc->board.vbus_pin > 0)
+ if (gpio_is_valid(udc->board.vbus_pin))
gpio_free(udc->board.vbus_pin);
fail2:
free_irq(udc->udp_irq, udc);
fail1:
- device_unregister(&udc->gadget.dev);
-fail0b:
+ if (IS_ENABLED(CONFIG_COMMON_CLK) && !IS_ERR(udc->uclk))
+ clk_put(udc->uclk);
+ if (!IS_ERR(udc->fclk))
+ clk_put(udc->fclk);
+ if (!IS_ERR(udc->iclk))
+ clk_put(udc->iclk);
iounmap(udc->udp_baseaddr);
fail0a:
if (cpu_is_at91rm9200())
gpio_free(udc->board.pullup_pin);
fail0:
- release_mem_region(res->start, res->end - res->start + 1);
+ release_mem_region(res->start, resource_size(res));
DBG("%s probe failed, %d\n", driver_name, retval);
return retval;
}
@@ -1783,33 +1869,37 @@ static int __exit at91udc_remove(struct platform_device *pdev)
{
struct at91_udc *udc = platform_get_drvdata(pdev);
struct resource *res;
+ 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);
- if (udc->board.vbus_pin > 0) {
- free_irq(udc->board.vbus_pin, udc);
+ if (gpio_is_valid(udc->board.vbus_pin)) {
+ free_irq(gpio_to_irq(udc->board.vbus_pin), udc);
gpio_free(udc->board.vbus_pin);
}
free_irq(udc->udp_irq, udc);
- device_unregister(&udc->gadget.dev);
-
iounmap(udc->udp_baseaddr);
if (cpu_is_at91rm9200())
gpio_free(udc->board.pullup_pin);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- release_mem_region(res->start, res->end - res->start + 1);
+ release_mem_region(res->start, resource_size(res));
clk_put(udc->iclk);
clk_put(udc->fclk);
+ if (IS_ENABLED(CONFIG_COMMON_CLK))
+ clk_put(udc->uclk);
return 0;
}
@@ -1819,6 +1909,7 @@ 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
@@ -1828,13 +1919,15 @@ static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
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 (udc->board.vbus_pin > 0 && wake)
+ if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled && wake)
enable_irq_wake(udc->board.vbus_pin);
return 0;
}
@@ -1842,15 +1935,20 @@ static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
static int at91udc_resume(struct platform_device *pdev)
{
struct at91_udc *udc = platform_get_drvdata(pdev);
+ unsigned long flags;
- if (udc->board.vbus_pin > 0 && udc->active_suspend)
+ 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
+ else {
+ spin_lock_irqsave(&udc->lock, flags);
pullup(udc, 1);
+ spin_unlock_irqrestore(&udc->lock, flags);
+ }
return 0;
}
#else
@@ -1858,6 +1956,15 @@ static int at91udc_resume(struct platform_device *pdev)
#define at91udc_resume NULL
#endif
+#if defined(CONFIG_OF)
+static const struct of_device_id at91_udc_dt_ids[] = {
+ { .compatible = "atmel,at91rm9200-udc" },
+ { /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, at91_udc_dt_ids);
+#endif
+
static struct platform_driver at91_udc_driver = {
.remove = __exit_p(at91udc_remove),
.shutdown = at91udc_shutdown,
@@ -1866,21 +1973,13 @@ static struct platform_driver at91_udc_driver = {
.driver = {
.name = (char *) driver_name,
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(at91_udc_dt_ids),
},
};
-static int __init udc_init_module(void)
-{
- return platform_driver_probe(&at91_udc_driver, at91udc_probe);
-}
-module_init(udc_init_module);
-
-static void __exit udc_exit_module(void)
-{
- platform_driver_unregister(&at91_udc_driver);
-}
-module_exit(udc_exit_module);
+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");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-11 02:50:30 +0000