/* * 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 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 = ehci_init, .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, /* * 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, }; static int ehci_hcd_au1xxx_drv_probe(struct platform_device *pdev) { struct usb_hcd *hcd; struct ehci_hcd *ehci; 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; 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"); 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(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_DISABLED | 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 platform_device *pdev, pm_message_t message) { struct usb_hcd *hcd = platform_get_drvdata(pdev); struct ehci_hcd *ehci = hcd_to_ehci(hcd); unsigned long flags; int rc; return 0; rc = 0; if (time_before(jiffies, ehci->next_statechange)) msleep(10); /* Root hub was already suspended. Disable irq emission and * mark HW unaccessible, bail out if RH has been resumed. Use * the spinlock to properly synchronize with possible pending * RH suspend or resume activity. * * This is still racy as hcd->state is manipulated outside of * any locks =P But that will be a different fix. */ spin_lock_irqsave(&ehci->lock, flags); if (hcd->state != HC_STATE_SUSPENDED) { rc = -EINVAL; goto bail; } ehci_writel(ehci, 0, &ehci->regs->intr_enable); (void)ehci_readl(ehci, &ehci->regs->intr_enable); /* make sure snapshot being resumed re-enumerates everything */ if (message.event == PM_EVENT_PRETHAW) { ehci_halt(ehci); ehci_reset(ehci); } clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); au1xxx_stop_ehc(); bail: spin_unlock_irqrestore(&ehci->lock, flags); // could save FLADJ in case of Vaux power loss // ... we'd only use it to handle clock skew return rc; } static int ehci_hcd_au1xxx_drv_resume(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); 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; 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); hcd->state = HC_STATE_SUSPENDED; return 0; } #else #define ehci_hcd_au1xxx_drv_suspend NULL #define ehci_hcd_au1xxx_drv_resume 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, .suspend = ehci_hcd_au1xxx_drv_suspend, .resume = ehci_hcd_au1xxx_drv_resume, .driver = { .name = "au1xxx-ehci", .owner = THIS_MODULE, } }; MODULE_ALIAS("platform:au1xxx-ehci");