USB: at91_udc, misc fixes
This is an update to the AT91 USB Device (Gadget) driver.
Adds support for the Atmel AT91SAM9260 and AT91SAM9261 processors. The
only difference is how they handle the pullup pin.
[Patch from Patrice Vilchez]
Need to clear any pending USB Device interrupts before registering the
interrupt handler. The bootloader might have been using the USB Device
port. [Patch from Peer Georgi]
VBUS detection is handled by a GPIO interrupt which only triggers on a
change. Is is therefore necessary to read the current VBUS state
explicitly at startup. [Patch from Peer Georgi]
Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c
index b53b937..c8954a6 100644
--- a/drivers/usb/gadget/at91_udc.c
+++ b/drivers/usb/gadget/at91_udc.c
@@ -51,6 +51,8 @@
#include <asm/arch/gpio.h>
#include <asm/arch/board.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/at91sam9261_matrix.h>
#include "at91_udc.h"
@@ -909,11 +911,37 @@
if (is_on) {
clk_on(udc);
at91_udp_write(udc, AT91_UDP_TXVC, 0);
- at91_set_gpio_value(udc->board.pullup_pin, 1);
+ if (cpu_is_at91rm9200())
+ at91_set_gpio_value(udc->board.pullup_pin, 1);
+ else if (cpu_is_at91sam9260()) {
+ 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()) {
+ u32 usbpucr;
+
+ usbpucr = at91_sys_read(AT91_MATRIX_USBPUCR);
+ usbpucr |= AT91_MATRIX_USBPUCR_PUON;
+ at91_sys_write(AT91_MATRIX_USBPUCR, usbpucr);
+ }
} else {
stop_activity(udc);
at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
- at91_set_gpio_value(udc->board.pullup_pin, 0);
+ if (cpu_is_at91rm9200())
+ at91_set_gpio_value(udc->board.pullup_pin, 0);
+ else if (cpu_is_at91sam9260()) {
+ 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()) {
+ u32 usbpucr;
+
+ usbpucr = at91_sys_read(AT91_MATRIX_USBPUCR);
+ usbpucr &= ~AT91_MATRIX_USBPUCR_PUON;
+ at91_sys_write(AT91_MATRIX_USBPUCR, usbpucr);
+ }
clk_off(udc);
}
}
@@ -1668,7 +1696,8 @@
udc->fclk = clk_get(dev, "udpck");
if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk)) {
DBG("clocks missing\n");
- return -ENODEV;
+ retval = -ENODEV;
+ goto fail0;
}
retval = device_register(&udc->gadget.dev);
@@ -1679,6 +1708,8 @@
clk_enable(udc->iclk);
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 */
@@ -1690,6 +1721,11 @@
goto fail1;
}
if (udc->board.vbus_pin > 0) {
+ /*
+ * Get the initial state of VBUS - we cannot expect
+ * a pending interrupt.
+ */
+ udc->vbus = at91_get_gpio_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",
diff --git a/drivers/usb/gadget/at91_udc.h b/drivers/usb/gadget/at91_udc.h
index a35f3b6..677089b 100644
--- a/drivers/usb/gadget/at91_udc.h
+++ b/drivers/usb/gadget/at91_udc.h
@@ -51,10 +51,10 @@
#define AT91_UDP_EP(n) (1 << (n)) /* Endpoint Interrupt Status */
#define AT91_UDP_RXSUSP (1 << 8) /* USB Suspend Interrupt Status */
#define AT91_UDP_RXRSM (1 << 9) /* USB Resume Interrupt Status */
-#define AT91_UDP_EXTRSM (1 << 10) /* External Resume Interrupt Status */
+#define AT91_UDP_EXTRSM (1 << 10) /* External Resume Interrupt Status [AT91RM9200 only] */
#define AT91_UDP_SOFINT (1 << 11) /* Start of Frame Interrupt Status */
#define AT91_UDP_ENDBUSRES (1 << 12) /* End of Bus Reset Interrpt Status */
-#define AT91_UDP_WAKEUP (1 << 13) /* USB Wakeup Interrupt Status */
+#define AT91_UDP_WAKEUP (1 << 13) /* USB Wakeup Interrupt Status [AT91RM9200 only] */
#define AT91_UDP_ICR 0x20 /* Interrupt Clear Register */
#define AT91_UDP_RST_EP 0x28 /* Reset Endpoint Register */
@@ -84,7 +84,7 @@
#define AT91_UDP_TXVC 0x74 /* Transceiver Control Register */
#define AT91_UDP_TXVC_TXVDIS (1 << 8) /* Transceiver Disable */
-
+#define AT91_UDP_TXVC_PUON (1 << 9) /* PullUp On [AT91SAM9260 only] */
/*-------------------------------------------------------------------------*/