/* * OHCI HCD (Host Controller Driver) for USB. * * Copyright (C) 2004 SAN People (Pty) Ltd. * Copyright (C) 2005 Thibaut VARENE * * AT91 Bus Glue * * Based on fragments of 2.4 driver by Rick Bronson. * Based on ohci-omap.c * * This file is licenced under the GPL. */ #include #include #include #include #include #include #ifndef CONFIG_ARCH_AT91 #error "CONFIG_ARCH_AT91 must be defined." #endif /* interface and function clocks; sometimes also an AHB clock */ static struct clk *iclk, *fclk, *hclk; static int clocked; extern int usb_disabled(void); /*-------------------------------------------------------------------------*/ static void at91_start_clock(void) { clk_enable(hclk); clk_enable(iclk); clk_enable(fclk); clocked = 1; } static void at91_stop_clock(void) { clk_disable(fclk); clk_disable(iclk); clk_disable(hclk); clocked = 0; } static void at91_start_hc(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); struct ohci_regs __iomem *regs = hcd->regs; dev_dbg(&pdev->dev, "start\n"); /* * Start the USB clocks. */ at91_start_clock(); /* * The USB host controller must remain in reset. */ writel(0, ®s->control); } static void at91_stop_hc(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); struct ohci_regs __iomem *regs = hcd->regs; dev_dbg(&pdev->dev, "stop\n"); /* * Put the USB host controller into reset. */ writel(0, ®s->control); /* * Stop the USB clocks. */ at91_stop_clock(); } /*-------------------------------------------------------------------------*/ static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *); /* configure so an HC device and id are always provided */ /* always called with process context; sleeping is OK */ /** * usb_hcd_at91_probe - initialize AT91-based HCDs * Context: !in_interrupt() * * Allocates basic resources for this USB host controller, and * then invokes the start() method for the HCD associated with it * through the hotplug entry's driver_data. */ static int usb_hcd_at91_probe(const struct hc_driver *driver, struct platform_device *pdev) { int retval; struct usb_hcd *hcd = NULL; if (pdev->num_resources != 2) { pr_debug("hcd probe: invalid num_resources"); return -ENODEV; } if ((pdev->resource[0].flags != IORESOURCE_MEM) || (pdev->resource[1].flags != IORESOURCE_IRQ)) { pr_debug("hcd probe: invalid resource type\n"); return -ENODEV; } hcd = usb_create_hcd(driver, &pdev->dev, "at91"); if (!hcd) return -ENOMEM; hcd->rsrc_start = pdev->resource[0].start; hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1; if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { pr_debug("request_mem_region failed\n"); retval = -EBUSY; goto err1; } hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); if (!hcd->regs) { pr_debug("ioremap failed\n"); retval = -EIO; goto err2; } iclk = clk_get(&pdev->dev, "ohci_clk"); fclk = clk_get(&pdev->dev, "uhpck"); hclk = clk_get(&pdev->dev, "hclk"); at91_start_hc(pdev); ohci_hcd_init(hcd_to_ohci(hcd)); retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED); if (retval == 0) return retval; /* Error handling */ at91_stop_hc(pdev); clk_put(hclk); clk_put(fclk); clk_put(iclk); iounmap(hcd->regs); err2: release_mem_region(hcd->rsrc_start, hcd->rsrc_len); err1: usb_put_hcd(hcd); return retval; } /* may be called with controller, bus, and devices active */ /** * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs * @dev: USB Host Controller being removed * Context: !in_interrupt() * * Reverses the effect of usb_hcd_at91_probe(), first invoking * the HCD's stop() method. It is always called from a thread * context, "rmmod" or something similar. * */ static void usb_hcd_at91_remove(struct usb_hcd *hcd, struct platform_device *pdev) { usb_remove_hcd(hcd); at91_stop_hc(pdev); iounmap(hcd->regs); release_mem_region(hcd->rsrc_start, hcd->rsrc_len); usb_put_hcd(hcd); clk_put(hclk); clk_put(fclk); clk_put(iclk); fclk = iclk = hclk = NULL; dev_set_drvdata(&pdev->dev, NULL); } /*-------------------------------------------------------------------------*/ static int __devinit ohci_at91_start (struct usb_hcd *hcd) { struct at91_usbh_data *board = hcd->self.controller->platform_data; struct ohci_hcd *ohci = hcd_to_ohci (hcd); int ret; if ((ret = ohci_init(ohci)) < 0) return ret; ohci->num_ports = board->ports; if ((ret = ohci_run(ohci)) < 0) { err("can't start %s", hcd->self.bus_name); ohci_stop(hcd); return ret; } return 0; } /*-------------------------------------------------------------------------*/ static const struct hc_driver ohci_at91_hc_driver = { .description = hcd_name, .product_desc = "AT91 OHCI", .hcd_priv_size = sizeof(struct ohci_hcd), /* * generic hardware linkage */ .irq = ohci_irq, .flags = HCD_USB11 | HCD_MEMORY, /* * basic lifecycle operations */ .start = ohci_at91_start, .stop = ohci_stop, .shutdown = ohci_shutdown, /* * managing i/o requests and associated device resources */ .urb_enqueue = ohci_urb_enqueue, .urb_dequeue = ohci_urb_dequeue, .endpoint_disable = ohci_endpoint_disable, /* * scheduling support */ .get_frame_number = ohci_get_frame, /* * root hub support */ .hub_status_data = ohci_hub_status_data, .hub_control = ohci_hub_control, #ifdef CONFIG_PM .bus_suspend = ohci_bus_suspend, .bus_resume = ohci_bus_resume, #endif .start_port_reset = ohci_start_port_reset, }; /*-------------------------------------------------------------------------*/ static int ohci_hcd_at91_drv_probe(struct platform_device *pdev) { struct at91_usbh_data *pdata = pdev->dev.platform_data; int i; if (pdata) { /* REVISIT make the driver support per-port power switching, * and also overcurrent detection. Here we assume the ports * are always powered while this driver is active, and use * active-low power switches. */ for (i = 0; i < ARRAY_SIZE(pdata->vbus_pin); i++) { if (pdata->vbus_pin[i] <= 0) continue; gpio_request(pdata->vbus_pin[i], "ohci_vbus"); gpio_direction_output(pdata->vbus_pin[i], pdata->vbus_pin_inverted); } } device_init_wakeup(&pdev->dev, 1); return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev); } static int ohci_hcd_at91_drv_remove(struct platform_device *pdev) { struct at91_usbh_data *pdata = pdev->dev.platform_data; int i; if (pdata) { for (i = 0; i < ARRAY_SIZE(pdata->vbus_pin); i++) { if (pdata->vbus_pin[i] <= 0) continue; gpio_direction_output(pdata->vbus_pin[i], !pdata->vbus_pin_inverted); gpio_free(pdata->vbus_pin[i]); } } device_init_wakeup(&pdev->dev, 0); usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev); return 0; } #ifdef CONFIG_PM static int ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg) { struct usb_hcd *hcd = platform_get_drvdata(pdev); struct ohci_hcd *ohci = hcd_to_ohci(hcd); if (device_may_wakeup(&pdev->dev)) enable_irq_wake(hcd->irq); /* * The integrated transceivers seem unable to notice disconnect, * reconnect, or wakeup without the 48 MHz clock active. so for * correctness, always discard connection state (using reset). * * REVISIT: some boards will be able to turn VBUS off... */ if (at91_suspend_entering_slow_clock()) { ohci_usb_reset (ohci); /* flush the writes */ (void) ohci_readl (ohci, &ohci->regs->control); at91_stop_clock(); } return 0; } static int ohci_hcd_at91_drv_resume(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); if (device_may_wakeup(&pdev->dev)) disable_irq_wake(hcd->irq); if (!clocked) at91_start_clock(); ohci_finish_controller_resume(hcd); return 0; } #else #define ohci_hcd_at91_drv_suspend NULL #define ohci_hcd_at91_drv_resume NULL #endif MODULE_ALIAS("platform:at91_ohci"); static struct platform_driver ohci_hcd_at91_driver = { .probe = ohci_hcd_at91_drv_probe, .remove = ohci_hcd_at91_drv_remove, .shutdown = usb_hcd_platform_shutdown, .suspend = ohci_hcd_at91_drv_suspend, .resume = ohci_hcd_at91_drv_resume, .driver = { .name = "at91_ohci", .owner = THIS_MODULE, }, };