/* * EHCI HCD (Host Controller Driver) for USB. * * (C) Copyright 2000-2004 David Brownell * * Bus Glue for AMD Alchemy Au1xxx * * Based on "ohci-au1xxx.c" by Matt Porter * * Modified for AMD Alchemy Au1200 EHC * by K.Boge * * This file is licenced under the GPL. */ #include #include #ifndef CONFIG_SOC_AU1200 #error "this Alchemy chip doesn't have EHCI" #else /* Au1200 */ #define USB_HOST_CONFIG (USB_MSR_BASE + USB_MSR_MCFG) #define USB_MCFG_PFEN (1<<31) #define USB_MCFG_RDCOMB (1<<30) #define USB_MCFG_SSDEN (1<<23) #define USB_MCFG_PHYPLLEN (1<<19) #define USB_MCFG_EHCCLKEN (1<<17) #define USB_MCFG_UCAM (1<<7) #define USB_MCFG_EBMEN (1<<3) #define USB_MCFG_EMEMEN (1<<2) #define USBH_ENABLE_CE (USB_MCFG_PHYPLLEN | USB_MCFG_EHCCLKEN) #ifdef CONFIG_DMA_COHERENT #define USBH_ENABLE_INIT (USBH_ENABLE_CE \ | USB_MCFG_PFEN | USB_MCFG_RDCOMB \ | USB_MCFG_SSDEN | USB_MCFG_UCAM \ | USB_MCFG_EBMEN | USB_MCFG_EMEMEN) #else #define USBH_ENABLE_INIT (USBH_ENABLE_CE \ | USB_MCFG_PFEN | USB_MCFG_RDCOMB \ | USB_MCFG_SSDEN \ | USB_MCFG_EBMEN | USB_MCFG_EMEMEN) #endif #define USBH_DISABLE (USB_MCFG_EBMEN | USB_MCFG_EMEMEN) #endif /* Au1200 */ extern int usb_disabled(void); /*-------------------------------------------------------------------------*/ static void au1xxx_start_ehc(struct platform_device *dev) { pr_debug(__FILE__ ": starting Au1xxx EHCI USB Controller\n"); /* write HW defaults again in case Yamon cleared them */ if (au_readl(USB_HOST_CONFIG) == 0) { au_writel(0x00d02000, USB_HOST_CONFIG); au_readl(USB_HOST_CONFIG); udelay(1000); } /* enable host controller */ au_writel(USBH_ENABLE_CE | au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG); au_readl(USB_HOST_CONFIG); udelay(1000); au_writel(USBH_ENABLE_INIT | au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG); au_readl(USB_HOST_CONFIG); udelay(1000); pr_debug(__FILE__ ": Clock to USB host has been enabled\n"); } static void au1xxx_stop_ehc(struct platform_device *dev) { pr_debug(__FILE__ ": stopping Au1xxx EHCI USB Controller\n"); /* Disable mem */ au_writel(~USBH_DISABLE & au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG); udelay(1000); /* Disable clock */ au_writel(~USB_MCFG_EHCCLKEN & au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG); au_readl(USB_HOST_CONFIG); } /*-------------------------------------------------------------------------*/ /* configure so an HC device and id are always provided */ /* always called with process context; sleeping is OK */ /** * usb_ehci_au1xxx_probe - initialize Au1xxx-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. * */ int usb_ehci_au1xxx_probe(const struct hc_driver *driver, struct usb_hcd **hcd_out, struct platform_device *dev) { int retval; struct usb_hcd *hcd; struct ehci_hcd *ehci; #if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT) /* Au1200 AB USB does not support coherent memory */ if (!(read_c0_prid() & 0xff)) { pr_info("%s: this is chip revision AB!\n", dev->dev.name); pr_info("%s: update your board or re-configure the kernel\n", dev->dev.name); return -ENODEV; } #endif au1xxx_start_ehc(dev); if (dev->resource[1].flags != IORESOURCE_IRQ) { pr_debug("resource[1] is not IORESOURCE_IRQ"); retval = -ENOMEM; } hcd = usb_create_hcd(driver, &dev->dev, "Au1xxx"); if (!hcd) return -ENOMEM; hcd->rsrc_start = dev->resource[0].start; hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1; if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { pr_debug("request_mem_region failed"); retval = -EBUSY; goto err1; } hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); if (!hcd->regs) { pr_debug("ioremap failed"); retval = -ENOMEM; goto err2; } ehci = hcd_to_ehci(hcd); ehci->caps = hcd->regs; ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase)); /* cache this readonly data; minimize chip reads */ ehci->hcs_params = readl(&ehci->caps->hcs_params); /* ehci_hcd_init(hcd_to_ehci(hcd)); */ retval = usb_add_hcd(hcd, dev->resource[1].start, SA_INTERRUPT | SA_SHIRQ); if (retval == 0) return retval; au1xxx_stop_ehc(dev); iounmap(hcd->regs); err2: release_mem_region(hcd->rsrc_start, hcd->rsrc_len); err1: usb_put_hcd(hcd); return retval; } /* may be called without controller electrically present */ /* may be called with controller, bus, and devices active */ /** * usb_ehci_hcd_au1xxx_remove - shutdown processing for Au1xxx-based HCDs * @dev: USB Host Controller being removed * Context: !in_interrupt() * * Reverses the effect of usb_ehci_hcd_au1xxx_probe(), first invoking * the HCD's stop() method. It is always called from a thread * context, normally "rmmod", "apmd", or something similar. * */ void usb_ehci_au1xxx_remove(struct usb_hcd *hcd, struct platform_device *dev) { usb_remove_hcd(hcd); iounmap(hcd->regs); release_mem_region(hcd->rsrc_start, hcd->rsrc_len); usb_put_hcd(hcd); au1xxx_stop_ehc(dev); } /*-------------------------------------------------------------------------*/ static const struct hc_driver ehci_au1xxx_hc_driver = { .description = hcd_name, .product_desc = "Au1xxx EHCI", .hcd_priv_size = sizeof(struct ehci_hcd), /* * generic hardware linkage */ .irq = ehci_irq, .flags = HCD_MEMORY | HCD_USB2, /* * basic lifecycle operations */ .reset = ehci_init, .start = ehci_run, .stop = ehci_stop, /* * managing i/o requests and associated device resources */ .urb_enqueue = ehci_urb_enqueue, .urb_dequeue = ehci_urb_dequeue, .endpoint_disable = ehci_endpoint_disable, /* * scheduling support */ .get_frame_number = ehci_get_frame, /* * root hub support */ .hub_status_data = ehci_hub_status_data, .hub_control = ehci_hub_control, #ifdef CONFIG_PM .hub_suspend = ehci_hub_suspend, .hub_resume = ehci_hub_resume, #endif }; /*-------------------------------------------------------------------------*/ static int ehci_hcd_au1xxx_drv_probe(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct usb_hcd *hcd = NULL; int ret; pr_debug("In ehci_hcd_au1xxx_drv_probe\n"); if (usb_disabled()) return -ENODEV; ret = usb_ehci_au1xxx_probe(&ehci_au1xxx_hc_driver, &hcd, pdev); return ret; } static int ehci_hcd_au1xxx_drv_remove(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct usb_hcd *hcd = dev_get_drvdata(dev); usb_ehci_au1xxx_remove(hcd, pdev); return 0; } /*TBD*/ /*static int ehci_hcd_au1xxx_drv_suspend(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct usb_hcd *hcd = dev_get_drvdata(dev); return 0; } static int ehci_hcd_au1xxx_drv_resume(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct usb_hcd *hcd = dev_get_drvdata(dev); return 0; } */ static struct device_driver ehci_hcd_au1xxx_driver = { .name = "au1xxx-ehci", .bus = &platform_bus_type, .probe = ehci_hcd_au1xxx_drv_probe, .remove = ehci_hcd_au1xxx_drv_remove, /*.suspend = ehci_hcd_au1xxx_drv_suspend, */ /*.resume = ehci_hcd_au1xxx_drv_resume, */ }; static int __init ehci_hcd_au1xxx_init(void) { pr_debug(DRIVER_INFO " (Au1xxx)\n"); return driver_register(&ehci_hcd_au1xxx_driver); } static void __exit ehci_hcd_au1xxx_cleanup(void) { driver_unregister(&ehci_hcd_au1xxx_driver); } module_init(ehci_hcd_au1xxx_init); module_exit(ehci_hcd_au1xxx_cleanup);