| /* |
| * EHCI HCD (Host Controller Driver) for USB. |
| * |
| * Bus Glue for AMD Alchemy Au1xxx |
| * |
| * Based on "ohci-au1xxx.c" by Matt Porter <mporter@kernel.crashing.org> |
| * |
| * Modified for AMD Alchemy Au1200 EHC |
| * by K.Boge <karsten.boge@amd.com> |
| * |
| * This file is licenced under the GPL. |
| */ |
| |
| #include <linux/platform_device.h> |
| #include <asm/mach-au1x00/au1000.h> |
| |
| #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_UCECLKEN (1<<18) |
| #define USB_MCFG_EHCCLKEN (1<<17) |
| #ifdef CONFIG_DMA_COHERENT |
| #define USB_MCFG_UCAM (1<<7) |
| #else |
| #define USB_MCFG_UCAM (0) |
| #endif |
| #define USB_MCFG_EBMEN (1<<3) |
| #define USB_MCFG_EMEMEN (1<<2) |
| |
| #define USBH_ENABLE_CE (USB_MCFG_PHYPLLEN | USB_MCFG_EHCCLKEN) |
| #define USBH_ENABLE_INIT (USB_MCFG_PFEN | USB_MCFG_RDCOMB | \ |
| USBH_ENABLE_CE | USB_MCFG_SSDEN | \ |
| USB_MCFG_UCAM | USB_MCFG_EBMEN | \ |
| USB_MCFG_EMEMEN) |
| |
| #define USBH_DISABLE (USB_MCFG_EBMEN | USB_MCFG_EMEMEN) |
| |
| extern int usb_disabled(void); |
| |
| static void au1xxx_start_ehc(void) |
| { |
| /* enable clock to EHCI block and HS PHY PLL*/ |
| au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_CE, USB_HOST_CONFIG); |
| au_sync(); |
| udelay(1000); |
| |
| /* enable EHCI mmio */ |
| au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_INIT, USB_HOST_CONFIG); |
| au_sync(); |
| udelay(1000); |
| } |
| |
| static void au1xxx_stop_ehc(void) |
| { |
| unsigned long c; |
| |
| /* Disable mem */ |
| au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_DISABLE, USB_HOST_CONFIG); |
| au_sync(); |
| udelay(1000); |
| |
| /* Disable EHC clock. If the HS PHY is unused disable it too. */ |
| c = au_readl(USB_HOST_CONFIG) & ~USB_MCFG_EHCCLKEN; |
| if (!(c & USB_MCFG_UCECLKEN)) /* UDC disabled? */ |
| c &= ~USB_MCFG_PHYPLLEN; /* yes: disable HS PHY PLL */ |
| au_writel(c, USB_HOST_CONFIG); |
| au_sync(); |
| } |
| |
| static int au1xxx_ehci_setup(struct usb_hcd *hcd) |
| { |
| struct ehci_hcd *ehci = hcd_to_ehci(hcd); |
| int ret = ehci_init(hcd); |
| |
| ehci->need_io_watchdog = 0; |
| return ret; |
| } |
| |
| 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 |
| * |
| * FIXME -- ehci_init() doesn't do enough here. |
| * See ehci-ppc-soc for a complete implementation. |
| */ |
| .reset = au1xxx_ehci_setup, |
| .start = ehci_run, |
| .stop = ehci_stop, |
| .shutdown = ehci_shutdown, |
| |
| /* |
| * managing i/o requests and associated device resources |
| */ |
| .urb_enqueue = ehci_urb_enqueue, |
| .urb_dequeue = ehci_urb_dequeue, |
| .endpoint_disable = ehci_endpoint_disable, |
| .endpoint_reset = ehci_endpoint_reset, |
| |
| /* |
| * scheduling support |
| */ |
| .get_frame_number = ehci_get_frame, |
| |
| /* |
| * root hub support |
| */ |
| .hub_status_data = ehci_hub_status_data, |
| .hub_control = ehci_hub_control, |
| .bus_suspend = ehci_bus_suspend, |
| .bus_resume = ehci_bus_resume, |
| .relinquish_port = ehci_relinquish_port, |
| .port_handed_over = ehci_port_handed_over, |
| |
| .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, |
| }; |
| |
| static int ehci_hcd_au1xxx_drv_probe(struct platform_device *pdev) |
| { |
| struct usb_hcd *hcd; |
| struct ehci_hcd *ehci; |
| struct resource *res; |
| int ret; |
| |
| if (usb_disabled()) |
| return -ENODEV; |
| |
| #if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT) |
| /* Au1200 AB USB does not support coherent memory */ |
| if (!(read_c0_prid() & 0xff)) { |
| printk(KERN_INFO "%s: this is chip revision AB!\n", pdev->name); |
| printk(KERN_INFO "%s: update your board or re-configure" |
| " the kernel\n", pdev->name); |
| return -ENODEV; |
| } |
| #endif |
| |
| if (pdev->resource[1].flags != IORESOURCE_IRQ) { |
| pr_debug("resource[1] is not IORESOURCE_IRQ"); |
| return -ENOMEM; |
| } |
| hcd = usb_create_hcd(&ehci_au1xxx_hc_driver, &pdev->dev, "Au1xxx"); |
| if (!hcd) |
| return -ENOMEM; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| hcd->rsrc_start = res->start; |
| hcd->rsrc_len = resource_size(res); |
| |
| if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { |
| pr_debug("request_mem_region failed"); |
| ret = -EBUSY; |
| goto err1; |
| } |
| |
| hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); |
| if (!hcd->regs) { |
| pr_debug("ioremap failed"); |
| ret = -ENOMEM; |
| goto err2; |
| } |
| |
| au1xxx_start_ehc(); |
| |
| ehci = hcd_to_ehci(hcd); |
| ehci->caps = hcd->regs; |
| ehci->regs = hcd->regs + |
| HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase)); |
| /* cache this readonly data; minimize chip reads */ |
| ehci->hcs_params = readl(&ehci->caps->hcs_params); |
| |
| ret = usb_add_hcd(hcd, pdev->resource[1].start, |
| IRQF_SHARED); |
| if (ret == 0) { |
| platform_set_drvdata(pdev, hcd); |
| return ret; |
| } |
| |
| au1xxx_stop_ehc(); |
| iounmap(hcd->regs); |
| err2: |
| release_mem_region(hcd->rsrc_start, hcd->rsrc_len); |
| err1: |
| usb_put_hcd(hcd); |
| return ret; |
| } |
| |
| static int ehci_hcd_au1xxx_drv_remove(struct platform_device *pdev) |
| { |
| struct usb_hcd *hcd = platform_get_drvdata(pdev); |
| |
| usb_remove_hcd(hcd); |
| iounmap(hcd->regs); |
| release_mem_region(hcd->rsrc_start, hcd->rsrc_len); |
| usb_put_hcd(hcd); |
| au1xxx_stop_ehc(); |
| platform_set_drvdata(pdev, NULL); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM |
| static int ehci_hcd_au1xxx_drv_suspend(struct device *dev) |
| { |
| struct usb_hcd *hcd = dev_get_drvdata(dev); |
| struct ehci_hcd *ehci = hcd_to_ehci(hcd); |
| unsigned long flags; |
| int rc = 0; |
| |
| if (time_before(jiffies, ehci->next_statechange)) |
| msleep(10); |
| |
| /* Root hub was already suspended. Disable irq emission and |
| * mark HW unaccessible. The PM and USB cores make sure that |
| * the root hub is either suspended or stopped. |
| */ |
| ehci_prepare_ports_for_controller_suspend(ehci, device_may_wakeup(dev)); |
| spin_lock_irqsave(&ehci->lock, flags); |
| ehci_writel(ehci, 0, &ehci->regs->intr_enable); |
| (void)ehci_readl(ehci, &ehci->regs->intr_enable); |
| |
| clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); |
| spin_unlock_irqrestore(&ehci->lock, flags); |
| |
| // could save FLADJ in case of Vaux power loss |
| // ... we'd only use it to handle clock skew |
| |
| au1xxx_stop_ehc(); |
| |
| return rc; |
| } |
| |
| static int ehci_hcd_au1xxx_drv_resume(struct device *dev) |
| { |
| struct usb_hcd *hcd = dev_get_drvdata(dev); |
| struct ehci_hcd *ehci = hcd_to_ehci(hcd); |
| |
| au1xxx_start_ehc(); |
| |
| // maybe restore FLADJ |
| |
| if (time_before(jiffies, ehci->next_statechange)) |
| msleep(100); |
| |
| /* Mark hardware accessible again as we are out of D3 state by now */ |
| set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); |
| |
| /* If CF is still set, we maintained PCI Vaux power. |
| * Just undo the effect of ehci_pci_suspend(). |
| */ |
| if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) { |
| int mask = INTR_MASK; |
| |
| ehci_prepare_ports_for_controller_resume(ehci); |
| if (!hcd->self.root_hub->do_remote_wakeup) |
| mask &= ~STS_PCD; |
| ehci_writel(ehci, mask, &ehci->regs->intr_enable); |
| ehci_readl(ehci, &ehci->regs->intr_enable); |
| return 0; |
| } |
| |
| ehci_dbg(ehci, "lost power, restarting\n"); |
| usb_root_hub_lost_power(hcd->self.root_hub); |
| |
| /* Else reset, to cope with power loss or flush-to-storage |
| * style "resume" having let BIOS kick in during reboot. |
| */ |
| (void) ehci_halt(ehci); |
| (void) ehci_reset(ehci); |
| |
| /* emptying the schedule aborts any urbs */ |
| spin_lock_irq(&ehci->lock); |
| if (ehci->reclaim) |
| end_unlink_async(ehci); |
| ehci_work(ehci); |
| spin_unlock_irq(&ehci->lock); |
| |
| ehci_writel(ehci, ehci->command, &ehci->regs->command); |
| ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag); |
| ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */ |
| |
| /* here we "know" root ports should always stay powered */ |
| ehci_port_power(ehci, 1); |
| |
| ehci->rh_state = EHCI_RH_SUSPENDED; |
| |
| return 0; |
| } |
| |
| static const struct dev_pm_ops au1xxx_ehci_pmops = { |
| .suspend = ehci_hcd_au1xxx_drv_suspend, |
| .resume = ehci_hcd_au1xxx_drv_resume, |
| }; |
| |
| #define AU1XXX_EHCI_PMOPS &au1xxx_ehci_pmops |
| |
| #else |
| #define AU1XXX_EHCI_PMOPS NULL |
| #endif |
| |
| static struct platform_driver ehci_hcd_au1xxx_driver = { |
| .probe = ehci_hcd_au1xxx_drv_probe, |
| .remove = ehci_hcd_au1xxx_drv_remove, |
| .shutdown = usb_hcd_platform_shutdown, |
| .driver = { |
| .name = "au1xxx-ehci", |
| .owner = THIS_MODULE, |
| .pm = AU1XXX_EHCI_PMOPS, |
| } |
| }; |
| |
| MODULE_ALIAS("platform:au1xxx-ehci"); |