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>

2 files changed, 42 insertions, 6 deletions

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 @@ static void pullup(struct at91_udc *udc, int is_on)
 	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 @@ static int __devinit at91udc_probe(struct platform_device *pdev)
 	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 @@ static int __devinit at91udc_probe(struct platform_device *pdev)
 	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 @@ static int __devinit at91udc_probe(struct platform_device *pdev)
 		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] */
 
 /*-------------------------------------------------------------------------*/