From 8b2e76687b39213725207b4a4264e11e8c7b86e6 Mon Sep 17 00:00:00 2001 From: David Brownell Date: Wed, 5 Jul 2006 02:38:56 -0700 Subject: [PATCH] USB: AT91 UDC updates, mostly power management UDC updates for AT91 series processors: - Get ready for at91sam926x processors (ARMv5tej not ARMv4t) - Suspend/resume support now behaves properly - In "standby" mode, UDC can be a source of system wakeup events (host resume, device connect/disconnect, etc) - Fix IRQ storming issues, seemingly related to clock disabling changes that went in a while back And minor cleanups, especially whitespace. Signed-off-by: David Brownell Signed-off-by: Andrew Victor Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/at91_udc.c | 176 +++++++++++++++++++++++++++--------------- drivers/usb/gadget/at91_udc.h | 1 + 2 files changed, 113 insertions(+), 64 deletions(-) diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c index 1c459ff..cfebca0 100644 --- a/drivers/usb/gadget/at91_udc.c +++ b/drivers/usb/gadget/at91_udc.c @@ -57,19 +57,23 @@ /* * This controller is simple and PIO-only. It's used in many AT91-series - * ARMv4T controllers, including the at91rm9200 (arm920T, with MMU), - * at91sam9261 (arm926ejs, with MMU), and several no-mmu versions. + * 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 * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the - * testing hasn't covered such cases.) The pullup is most important; it + * testing hasn't covered such cases.) + * + * The pullup is most important (so it's integrated on sam926x parts). It * provides software control over whether the host enumerates the device. + * * The VBUS sensing helps during enumeration, and allows both USB clocks * (and the transceiver) to stay gated off until they're necessary, saving - * power. During USB suspend, the 48 MHz clock is gated off. + * power. During USB suspend, the 48 MHz clock is gated off in hardware; + * it may also be gated off by software during some Linux sleep states. */ -#define DRIVER_VERSION "8 March 2005" +#define DRIVER_VERSION "3 May 2006" static const char driver_name [] = "at91_udc"; static const char ep0name[] = "ep0"; @@ -316,9 +320,15 @@ static void done(struct at91_ep *ep, struct at91_request *req, int status) * * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE * that shouldn't normally be changed. + * + * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains, + * implying a need to wait for one write to complete (test relevant bits) + * before starting the next write. This shouldn't be an issue given how + * infrequently we write, except maybe for write-then-read idioms. */ #define SET_FX (AT91_UDP_TXPKTRDY) -#define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP) +#define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \ + | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP) /* pull OUT packet data from the endpoint's fifo */ static int read_fifo (struct at91_ep *ep, struct at91_request *req) @@ -472,7 +482,8 @@ static void nuke(struct at91_ep *ep, int status) /*-------------------------------------------------------------------------*/ -static int at91_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc) +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; @@ -582,11 +593,12 @@ static int at91_ep_disable (struct usb_ep * _ep) * interesting for request or buffer allocation. */ -static struct usb_request *at91_ep_alloc_request (struct usb_ep *_ep, unsigned int gfp_flags) +static struct usb_request * +at91_ep_alloc_request(struct usb_ep *_ep, unsigned int gfp_flags) { struct at91_request *req; - req = kcalloc(1, sizeof (struct at91_request), SLAB_KERNEL); + req = kcalloc(1, sizeof (struct at91_request), gfp_flags); if (!req) return NULL; @@ -862,6 +874,7 @@ static void stop_activity(struct at91_udc *udc) if (udc->gadget.speed == USB_SPEED_UNKNOWN) driver = NULL; udc->gadget.speed = USB_SPEED_UNKNOWN; + udc->suspended = 0; for (i = 0; i < NUM_ENDPOINTS; i++) { struct at91_ep *ep = &udc->ep[i]; @@ -889,8 +902,8 @@ static void clk_off(struct at91_udc *udc) return; udc->clocked = 0; udc->gadget.speed = USB_SPEED_UNKNOWN; - clk_disable(udc->iclk); clk_disable(udc->fclk); + clk_disable(udc->iclk); } /* @@ -911,9 +924,6 @@ static void pullup(struct at91_udc *udc, int is_on) at91_udp_write(AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS); at91_set_gpio_value(udc->board.pullup_pin, 0); clk_off(udc); - - // REVISIT: with transceiver disabled, will D- float - // so that a host would falsely detect a device? } } @@ -1290,7 +1300,8 @@ static void handle_ep0(struct at91_udc *udc) if (udc->wait_for_addr_ack) { u32 tmp; - at91_udp_write(AT91_UDP_FADDR, AT91_UDP_FEN | udc->addr); + at91_udp_write(AT91_UDP_FADDR, + AT91_UDP_FEN | udc->addr); tmp = at91_udp_read(AT91_UDP_GLB_STAT); tmp &= ~AT91_UDP_FADDEN; if (udc->addr) @@ -1361,9 +1372,10 @@ static irqreturn_t at91_udc_irq (int irq, void *_udc, struct pt_regs *r) u32 rescans = 5; while (rescans--) { - u32 status = at91_udp_read(AT91_UDP_ISR); + u32 status; - status &= at91_udp_read(AT91_UDP_IMR); + status = at91_udp_read(AT91_UDP_ISR) + & at91_udp_read(AT91_UDP_IMR); if (!status) break; @@ -1379,18 +1391,17 @@ static irqreturn_t at91_udc_irq (int irq, void *_udc, struct pt_regs *r) stop_activity(udc); /* enable ep0 */ - at91_udp_write(AT91_UDP_CSR(0), AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL); + at91_udp_write(AT91_UDP_CSR(0), + AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL); udc->gadget.speed = USB_SPEED_FULL; udc->suspended = 0; at91_udp_write(AT91_UDP_IER, AT91_UDP_EP(0)); /* * NOTE: this driver keeps clocks off unless the - * USB host is present. That saves power, and also - * eliminates IRQs (reset, resume, suspend) that can - * otherwise flood from the controller. If your - * board doesn't support VBUS detection, suspend and - * resume irq logic may need more attention... + * USB host is present. That saves power, but for + * boards that don't support VBUS detection, both + * clocks need to be active most of the time. */ /* host initiated suspend (3+ms bus idle) */ @@ -1452,13 +1463,19 @@ static irqreturn_t at91_udc_irq (int irq, void *_udc, struct pt_regs *r) /*-------------------------------------------------------------------------*/ +static void nop_release(struct device *dev) +{ + /* nothing to free */ +} + static struct at91_udc controller = { .gadget = { - .ops = &at91_udc_ops, - .ep0 = &controller.ep[0].ep, - .name = driver_name, - .dev = { - .bus_id = "gadget" + .ops = &at91_udc_ops, + .ep0 = &controller.ep[0].ep, + .name = driver_name, + .dev = { + .bus_id = "gadget", + .release = nop_release, } }, .ep[0] = { @@ -1468,7 +1485,8 @@ static struct at91_udc controller = { }, .udc = &controller, .maxpacket = 8, - .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(0)), + .creg = (void __iomem *)(AT91_VA_BASE_UDP + + AT91_UDP_CSR(0)), .int_mask = 1 << 0, }, .ep[1] = { @@ -1479,7 +1497,8 @@ static struct at91_udc controller = { .udc = &controller, .is_pingpong = 1, .maxpacket = 64, - .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(1)), + .creg = (void __iomem *)(AT91_VA_BASE_UDP + + AT91_UDP_CSR(1)), .int_mask = 1 << 1, }, .ep[2] = { @@ -1490,7 +1509,8 @@ static struct at91_udc controller = { .udc = &controller, .is_pingpong = 1, .maxpacket = 64, - .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(2)), + .creg = (void __iomem *)(AT91_VA_BASE_UDP + + AT91_UDP_CSR(2)), .int_mask = 1 << 2, }, .ep[3] = { @@ -1501,7 +1521,8 @@ static struct at91_udc controller = { }, .udc = &controller, .maxpacket = 8, - .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(3)), + .creg = (void __iomem *)(AT91_VA_BASE_UDP + + AT91_UDP_CSR(3)), .int_mask = 1 << 3, }, .ep[4] = { @@ -1512,7 +1533,8 @@ static struct at91_udc controller = { .udc = &controller, .is_pingpong = 1, .maxpacket = 256, - .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(4)), + .creg = (void __iomem *)(AT91_VA_BASE_UDP + + AT91_UDP_CSR(4)), .int_mask = 1 << 4, }, .ep[5] = { @@ -1523,10 +1545,11 @@ static struct at91_udc controller = { .udc = &controller, .is_pingpong = 1, .maxpacket = 256, - .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(5)), + .creg = (void __iomem *)(AT91_VA_BASE_UDP + + AT91_UDP_CSR(5)), .int_mask = 1 << 5, }, - /* ep6 and ep7 are also reserved */ + /* ep6 and ep7 are also reserved (custom silicon might use them) */ }; static irqreturn_t at91_vbus_irq(int irq, void *_udc, struct pt_regs *r) @@ -1593,6 +1616,7 @@ int usb_gadget_unregister_driver (struct usb_gadget_driver *driver) local_irq_disable(); udc->enabled = 0; + at91_udp_write(AT91_UDP_IDR, ~0); pullup(udc, 0); local_irq_enable(); @@ -1624,6 +1648,16 @@ static int __devinit at91udc_probe(struct platform_device *pdev) return -ENODEV; } + if (pdev->num_resources != 2) { + DBG("invalid num_resources"); + return -ENODEV; + } + if ((pdev->resource[0].flags != IORESOURCE_MEM) + || (pdev->resource[1].flags != IORESOURCE_IRQ)) { + DBG("invalid resource type"); + return -ENODEV; + } + if (!request_mem_region(AT91_BASE_UDP, SZ_16K, driver_name)) { DBG("someone's using UDC memory\n"); return -EBUSY; @@ -1649,19 +1683,26 @@ static int __devinit at91udc_probe(struct platform_device *pdev) if (retval < 0) goto fail0; - /* disable everything until there's a gadget driver and vbus */ - pullup(udc, 0); + /* don't do anything until we have both gadget driver and VBUS */ + clk_enable(udc->iclk); + at91_udp_write(AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS); + at91_udp_write(AT91_UDP_IDR, 0xffffffff); + clk_disable(udc->iclk); /* request UDC and maybe VBUS irqs */ - if (request_irq(AT91_ID_UDP, at91_udc_irq, IRQF_DISABLED, driver_name, udc)) { - DBG("request irq %d failed\n", AT91_ID_UDP); + udc->udp_irq = platform_get_irq(pdev, 0); + if (request_irq(udc->udp_irq, at91_udc_irq, + IRQF_DISABLED, driver_name, udc)) { + DBG("request irq %d failed\n", udc->udp_irq); retval = -EBUSY; goto fail1; } if (udc->board.vbus_pin > 0) { - 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(AT91_ID_UDP, udc); + 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 fail1; } @@ -1670,6 +1711,7 @@ static int __devinit at91udc_probe(struct platform_device *pdev) udc->vbus = 1; } dev_set_drvdata(dev, udc); + device_init_wakeup(dev, 1); create_debug_file(udc); INFO("%s version %s\n", driver_name, DRIVER_VERSION); @@ -1678,14 +1720,14 @@ static int __devinit at91udc_probe(struct platform_device *pdev) fail1: device_unregister(&udc->gadget.dev); fail0: - release_mem_region(AT91_VA_BASE_UDP, SZ_16K); + release_mem_region(AT91_BASE_UDP, SZ_16K); DBG("%s probe failed, %d\n", driver_name, retval); return retval; } -static int __devexit at91udc_remove(struct platform_device *dev) +static int __devexit at91udc_remove(struct platform_device *pdev) { - struct at91_udc *udc = platform_get_drvdata(dev); + struct at91_udc *udc = platform_get_drvdata(pdev); DBG("remove\n"); @@ -1694,10 +1736,11 @@ static int __devexit at91udc_remove(struct platform_device *dev) if (udc->driver != 0) usb_gadget_unregister_driver(udc->driver); + device_init_wakeup(&pdev->dev, 0); remove_debug_file(udc); if (udc->board.vbus_pin > 0) free_irq(udc->board.vbus_pin, udc); - free_irq(AT91_ID_UDP, udc); + free_irq(udc->udp_irq, udc); device_unregister(&udc->gadget.dev); release_mem_region(AT91_BASE_UDP, SZ_16K); @@ -1708,31 +1751,36 @@ static int __devexit at91udc_remove(struct platform_device *dev) } #ifdef CONFIG_PM -static int at91udc_suspend(struct platform_device *dev, pm_message_t mesg) +static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg) { - struct at91_udc *udc = platform_get_drvdata(dev); + struct at91_udc *udc = platform_get_drvdata(pdev); + int wake = udc->driver && device_may_wakeup(&pdev->dev); - /* - * The "safe" suspend transitions are opportunistic ... e.g. when - * the USB link is suspended (48MHz clock autogated off), or when - * it's disconnected (programmatically gated off, elsewhere). - * Then we can suspend, and the chip can enter slow clock mode. - * - * The problem case is some component (user mode?) suspending this - * device while it's active, with the 48 MHz clock in use. There - * are two basic approaches: (a) veto suspend levels involving slow - * clock mode, (b) disconnect, so 48 MHz will no longer be in use - * and we can enter slow clock mode. This uses (b) for now, since - * it's simplest until AT91 PM exists and supports the other option. + /* 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->vbus && !udc->suspended) + if ((!udc->suspended && udc->addr) + || !wake + || at91_suspend_entering_slow_clock()) { pullup(udc, 0); + disable_irq_wake(udc->udp_irq); + } else + enable_irq_wake(udc->udp_irq); + + if (udc->board.vbus_pin > 0) { + if (wake) + enable_irq_wake(udc->board.vbus_pin); + else + disable_irq_wake(udc->board.vbus_pin); + } return 0; } -static int at91udc_resume(struct platform_device *dev) +static int at91udc_resume(struct platform_device *pdev) { - struct at91_udc *udc = platform_get_drvdata(dev); + struct at91_udc *udc = platform_get_drvdata(pdev); /* maybe reconnect to host; if so, clocks on */ pullup(udc, 1); @@ -1748,7 +1796,7 @@ static struct platform_driver at91_udc = { .remove = __devexit_p(at91udc_remove), .shutdown = at91udc_shutdown, .suspend = at91udc_suspend, - .resume = at91udc_resume, + .resume = at91udc_resume, .driver = { .name = (char *) driver_name, .owner = THIS_MODULE, @@ -1767,6 +1815,6 @@ static void __devexit udc_exit_module(void) } module_exit(udc_exit_module); -MODULE_DESCRIPTION("AT91RM9200 udc driver"); +MODULE_DESCRIPTION("AT91 udc driver"); MODULE_AUTHOR("Thomas Rathbone, David Brownell"); MODULE_LICENSE("GPL"); diff --git a/drivers/usb/gadget/at91_udc.h b/drivers/usb/gadget/at91_udc.h index 5a4799c..882af42 100644 --- a/drivers/usb/gadget/at91_udc.h +++ b/drivers/usb/gadget/at91_udc.h @@ -141,6 +141,7 @@ struct at91_udc { struct clk *iclk, *fclk; struct platform_device *pdev; struct proc_dir_entry *pde; + int udp_irq; }; static inline struct at91_udc *to_udc(struct usb_gadget *g) -- 2.7.4