/* * OHCI HCD (Host Controller Driver) for USB. * * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net> * (C) Copyright 2002 Hewlett-Packard Company * * Bus Glue for AMD Alchemy Au1xxx * * Written by Christopher Hoover <ch@hpl.hp.com> * Based on fragments of previous driver by Russell King et al. * * Modified for LH7A404 from ohci-sa1111.c * by Durgesh Pattamatta <pattamattad@sharpsec.com> * Modified for AMD Alchemy Au1xxx * by Matt Porter <mporter@kernel.crashing.org> * * This file is licenced under the GPL. */ #include <linux/platform_device.h> #include <linux/signal.h> #include <asm/mach-au1x00/au1000.h> #ifndef CONFIG_SOC_AU1200 #define USBH_ENABLE_BE (1<<0) #define USBH_ENABLE_C (1<<1) #define USBH_ENABLE_E (1<<2) #define USBH_ENABLE_CE (1<<3) #define USBH_ENABLE_RD (1<<4) #ifdef __LITTLE_ENDIAN #define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C) #elif __BIG_ENDIAN #define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C | \ USBH_ENABLE_BE) #else #error not byte order defined #endif #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_OHCCLKEN (1<<16) #ifdef CONFIG_DMA_COHERENT #define USB_MCFG_UCAM (1<<7) #else #define USB_MCFG_UCAM (0) #endif #define USB_MCFG_OBMEN (1<<1) #define USB_MCFG_OMEMEN (1<<0) #define USBH_ENABLE_CE USB_MCFG_OHCCLKEN #define USBH_ENABLE_INIT (USB_MCFG_PFEN | USB_MCFG_RDCOMB | \ USBH_ENABLE_CE | USB_MCFG_SSDEN | \ USB_MCFG_UCAM | \ USB_MCFG_OBMEN | USB_MCFG_OMEMEN) #define USBH_DISABLE (USB_MCFG_OBMEN | USB_MCFG_OMEMEN) #endif /* Au1200 */ extern int usb_disabled(void); static void au1xxx_start_ohc(void) { /* enable host controller */ #ifndef CONFIG_SOC_AU1200 au_writel(USBH_ENABLE_CE, USB_HOST_CONFIG); au_sync(); udelay(1000); au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_INIT, USB_HOST_CONFIG); au_sync(); udelay(1000); /* wait for reset complete (read register twice; see au1500 errata) */ while (au_readl(USB_HOST_CONFIG), !(au_readl(USB_HOST_CONFIG) & USBH_ENABLE_RD)) udelay(1000); #else /* Au1200 */ au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_CE, USB_HOST_CONFIG); au_sync(); udelay(1000); au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_INIT, USB_HOST_CONFIG); au_sync(); udelay(2000); #endif /* Au1200 */ } static void au1xxx_stop_ohc(void) { #ifdef CONFIG_SOC_AU1200 /* Disable mem */ au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_DISABLE, USB_HOST_CONFIG); au_sync(); udelay(1000); #endif /* Disable clock */ au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_ENABLE_CE, USB_HOST_CONFIG); au_sync(); } static int __devinit ohci_au1xxx_start(struct usb_hcd *hcd) { struct ohci_hcd *ohci = hcd_to_ohci(hcd); int ret; ohci_dbg(ohci, "ohci_au1xxx_start, ohci:%p", ohci); if ((ret = ohci_init(ohci)) < 0) return ret; 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_au1xxx_hc_driver = { .description = hcd_name, .product_desc = "Au1xxx OHCI", .hcd_priv_size = sizeof(struct ohci_hcd), /* * generic hardware linkage */ .irq = ohci_irq, .flags = HCD_USB11 | HCD_MEMORY, /* * basic lifecycle operations */ .start = ohci_au1xxx_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_au1xxx_drv_probe(struct platform_device *pdev) { int ret; struct usb_hcd *hcd; 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\n"); return -ENOMEM; } hcd = usb_create_hcd(&ohci_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\n"); ret = -EBUSY; goto err1; } hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); if (!hcd->regs) { pr_debug("ioremap failed\n"); ret = -ENOMEM; goto err2; } au1xxx_start_ohc(); ohci_hcd_init(hcd_to_ohci(hcd)); 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_ohc(); iounmap(hcd->regs); err2: release_mem_region(hcd->rsrc_start, hcd->rsrc_len); err1: usb_put_hcd(hcd); return ret; } static int ohci_hcd_au1xxx_drv_remove(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); usb_remove_hcd(hcd); au1xxx_stop_ohc(); 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 ohci_hcd_au1xxx_drv_suspend(struct platform_device *pdev, pm_message_t message) { struct usb_hcd *hcd = platform_get_drvdata(pdev); struct ohci_hcd *ohci = hcd_to_ohci(hcd); unsigned long flags; int rc; rc = 0; /* 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(&ohci->lock, flags); if (hcd->state != HC_STATE_SUSPENDED) { rc = -EINVAL; goto bail; } ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable); (void)ohci_readl(ohci, &ohci->regs->intrdisable); /* make sure snapshot being resumed re-enumerates everything */ if (message.event == PM_EVENT_PRETHAW) ohci_usb_reset(ohci); clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); au1xxx_stop_ohc(); bail: spin_unlock_irqrestore(&ohci->lock, flags); return rc; } static int ohci_hcd_au1xxx_drv_resume(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); au1xxx_start_ohc(); set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); ohci_finish_controller_resume(hcd); return 0; } #else #define ohci_hcd_au1xxx_drv_suspend NULL #define ohci_hcd_au1xxx_drv_resume NULL #endif static struct platform_driver ohci_hcd_au1xxx_driver = { .probe = ohci_hcd_au1xxx_drv_probe, .remove = ohci_hcd_au1xxx_drv_remove, .shutdown = usb_hcd_platform_shutdown, .suspend = ohci_hcd_au1xxx_drv_suspend, .resume = ohci_hcd_au1xxx_drv_resume, .driver = { .name = "au1xxx-ohci", .owner = THIS_MODULE, }, }; MODULE_ALIAS("platform:au1xxx-ohci");