From 29ba4b533b677f3cd7f2fc901d51054555a8f243 Mon Sep 17 00:00:00 2001 From: Andrew Victor Date: Thu, 7 Dec 2006 22:44:38 -0800 Subject: [PATCH] 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 Signed-off-by: David Brownell Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/at91_udc.c | 42 ++++++++++++++++++++++++++++++++--- drivers/usb/gadget/at91_udc.h | 6 ++--- 2 files changed, 42 insertions(+), 6 deletions(-) diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c index b53b93700ca8..c8954a6ddf8c 100644 --- a/drivers/usb/gadget/at91_udc.c +++ b/drivers/usb/gadget/at91_udc.c @@ -51,6 +51,8 @@ #include #include +#include +#include #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 a35f3b627d3c..677089baa59d 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] */ /*-------------------------------------------------------------------------*/ -- 2.20.1