/* * EHCI HCD (Host Controller Driver) for USB. * * 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 extern int usb_disabled(void); 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; ehci_reset(ehci); 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 (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; } if (alchemy_usb_control(ALCHEMY_USB_EHCI0, 1)) { printk(KERN_INFO "%s: controller init failed!\n", pdev->name); ret = -ENODEV; goto err3; } 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; } alchemy_usb_control(ALCHEMY_USB_EHCI0, 0); err3: 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); alchemy_usb_control(ALCHEMY_USB_EHCI0, 0); iounmap(hcd->regs); release_mem_region(hcd->rsrc_start, hcd->rsrc_len); usb_put_hcd(hcd); 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 alchemy_usb_control(ALCHEMY_USB_EHCI0, 0); 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); alchemy_usb_control(ALCHEMY_USB_EHCI0, 1); // 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");