/* * OHCI HCD (Host Controller Driver) for USB. * * (C) Copyright 1999 Roman Weissgaerber * (C) Copyright 2000-2002 David Brownell * (C) Copyright 2002 Hewlett-Packard Company * * Bus Glue for Sharp LH7A404 * * Written by Christopher Hoover * Based on fragments of previous driver by Rusell King et al. * * Modified for LH7A404 from ohci-sa1111.c * by Durgesh Pattamatta * * This file is licenced under the GPL. */ #include #include #include extern int usb_disabled(void); /*-------------------------------------------------------------------------*/ static void lh7a404_start_hc(struct platform_device *dev) { printk(KERN_DEBUG __FILE__ ": starting LH7A404 OHCI USB Controller\n"); /* * Now, carefully enable the USB clock, and take * the USB host controller out of reset. */ CSC_PWRCNT |= CSC_PWRCNT_USBH_EN; /* Enable clock */ udelay(1000); USBH_CMDSTATUS = OHCI_HCR; printk(KERN_DEBUG __FILE__ ": Clock to USB host has been enabled \n"); } static void lh7a404_stop_hc(struct platform_device *dev) { printk(KERN_DEBUG __FILE__ ": stopping LH7A404 OHCI USB Controller\n"); CSC_PWRCNT &= ~CSC_PWRCNT_USBH_EN; /* Disable clock */ } /*-------------------------------------------------------------------------*/ static irqreturn_t usb_hcd_lh7a404_hcim_irq (int irq, void *__hcd, struct pt_regs * r) { struct usb_hcd *hcd = __hcd; return usb_hcd_irq(irq, hcd, r); } /*-------------------------------------------------------------------------*/ void usb_hcd_lh7a404_remove (struct usb_hcd *, struct platform_device *); /* configure so an HC device and id are always provided */ /* always called with process context; sleeping is OK */ /** * usb_hcd_lh7a404_probe - initialize LH7A404-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_hcd_lh7a404_probe (const struct hc_driver *driver, struct usb_hcd **hcd_out, struct platform_device *dev) { int retval; struct usb_hcd *hcd = 0; unsigned int *addr = NULL; if (!request_mem_region(dev->resource[0].start, dev->resource[0].end - dev->resource[0].start + 1, hcd_name)) { pr_debug("request_mem_region failed"); return -EBUSY; } lh7a404_start_hc(dev); addr = ioremap(dev->resource[0].start, dev->resource[0].end - dev->resource[0].start + 1); if (!addr) { pr_debug("ioremap failed"); retval = -ENOMEM; goto err1; } hcd = driver->hcd_alloc (); if (hcd == NULL){ pr_debug ("hcd_alloc failed"); retval = -ENOMEM; goto err1; } if(dev->resource[1].flags != IORESOURCE_IRQ){ pr_debug ("resource[1] is not IORESOURCE_IRQ"); retval = -ENOMEM; goto err1; } hcd->driver = (struct hc_driver *) driver; hcd->description = driver->description; hcd->irq = dev->resource[1].start; hcd->regs = addr; hcd->self.controller = &dev->dev; retval = hcd_buffer_create (hcd); if (retval != 0) { pr_debug ("pool alloc fail"); goto err1; } retval = request_irq (hcd->irq, usb_hcd_lh7a404_hcim_irq, SA_INTERRUPT, hcd->description, hcd); if (retval != 0) { pr_debug("request_irq failed"); retval = -EBUSY; goto err2; } pr_debug ("%s (LH7A404) at 0x%p, irq %d", hcd->description, hcd->regs, hcd->irq); usb_bus_init (&hcd->self); hcd->self.op = &usb_hcd_operations; hcd->self.hcpriv = (void *) hcd; hcd->self.bus_name = "lh7a404"; hcd->product_desc = "LH7A404 OHCI"; INIT_LIST_HEAD (&hcd->dev_list); usb_register_bus (&hcd->self); if ((retval = driver->start (hcd)) < 0) { usb_hcd_lh7a404_remove(hcd, dev); return retval; } *hcd_out = hcd; return 0; err2: hcd_buffer_destroy (hcd); if (hcd) driver->hcd_free(hcd); err1: lh7a404_stop_hc(dev); release_mem_region(dev->resource[0].start, dev->resource[0].end - dev->resource[0].start + 1); return retval; } /* may be called without controller electrically present */ /* may be called with controller, bus, and devices active */ /** * usb_hcd_lh7a404_remove - shutdown processing for LH7A404-based HCDs * @dev: USB Host Controller being removed * Context: !in_interrupt() * * Reverses the effect of usb_hcd_lh7a404_probe(), first invoking * the HCD's stop() method. It is always called from a thread * context, normally "rmmod", "apmd", or something similar. * */ void usb_hcd_lh7a404_remove (struct usb_hcd *hcd, struct platform_device *dev) { void *base; pr_debug ("remove: %s, state %x", hcd->self.bus_name, hcd->state); if (in_interrupt ()) BUG (); hcd->state = USB_STATE_QUIESCING; pr_debug ("%s: roothub graceful disconnect", hcd->self.bus_name); usb_disconnect (&hcd->self.root_hub); hcd->driver->stop (hcd); hcd->state = USB_STATE_HALT; free_irq (hcd->irq, hcd); hcd_buffer_destroy (hcd); usb_deregister_bus (&hcd->self); base = hcd->regs; hcd->driver->hcd_free (hcd); lh7a404_stop_hc(dev); release_mem_region(dev->resource[0].start, dev->resource[0].end - dev->resource[0].start + 1); } /*-------------------------------------------------------------------------*/ static int __devinit ohci_lh7a404_start (struct usb_hcd *hcd) { struct ohci_hcd *ohci = hcd_to_ohci (hcd); int ret; ohci_dbg (ohci, "ohci_lh7a404_start, ohci:%p", ohci); ohci->hcca = dma_alloc_coherent (hcd->self.controller, sizeof *ohci->hcca, &ohci->hcca_dma, 0); if (!ohci->hcca) return -ENOMEM; ohci_dbg (ohci, "ohci_lh7a404_start, ohci->hcca:%p", ohci->hcca); memset (ohci->hcca, 0, sizeof (struct ohci_hcca)); if ((ret = ohci_mem_init (ohci)) < 0) { ohci_stop (hcd); return ret; } ohci->regs = hcd->regs; if (hc_reset (ohci) < 0) { ohci_stop (hcd); return -ENODEV; } if (hc_start (ohci) < 0) { err ("can't start %s", ohci->hcd.self.bus_name); ohci_stop (hcd); return -EBUSY; } create_debug_files (ohci); #ifdef DEBUG ohci_dump (ohci, 1); #endif /*DEBUG*/ return 0; } /*-------------------------------------------------------------------------*/ static const struct hc_driver ohci_lh7a404_hc_driver = { .description = hcd_name, /* * generic hardware linkage */ .irq = ohci_irq, .flags = HCD_USB11, /* * basic lifecycle operations */ .start = ohci_lh7a404_start, #ifdef CONFIG_PM /* suspend: ohci_lh7a404_suspend, -- tbd */ /* resume: ohci_lh7a404_resume, -- tbd */ #endif /*CONFIG_PM*/ .stop = ohci_stop, /* * memory lifecycle (except per-request) */ .hcd_alloc = ohci_hcd_alloc, .hcd_free = ohci_hcd_free, /* * 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, }; /*-------------------------------------------------------------------------*/ static int ohci_hcd_lh7a404_drv_probe(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct usb_hcd *hcd = NULL; int ret; pr_debug ("In ohci_hcd_lh7a404_drv_probe"); if (usb_disabled()) return -ENODEV; ret = usb_hcd_lh7a404_probe(&ohci_lh7a404_hc_driver, &hcd, pdev); if (ret == 0) dev_set_drvdata(dev, hcd); return ret; } static int ohci_hcd_lh7a404_drv_remove(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct usb_hcd *hcd = dev_get_drvdata(dev); usb_hcd_lh7a404_remove(hcd, pdev); dev_set_drvdata(dev, NULL); return 0; } /*TBD*/ /*static int ohci_hcd_lh7a404_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 ohci_hcd_lh7a404_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 ohci_hcd_lh7a404_driver = { .name = "lh7a404-ohci", .bus = &platform_bus_type, .probe = ohci_hcd_lh7a404_drv_probe, .remove = ohci_hcd_lh7a404_drv_remove, /*.suspend = ohci_hcd_lh7a404_drv_suspend, */ /*.resume = ohci_hcd_lh7a404_drv_resume, */ }; static int __init ohci_hcd_lh7a404_init (void) { pr_debug (DRIVER_INFO " (LH7A404)"); pr_debug ("block sizes: ed %d td %d\n", sizeof (struct ed), sizeof (struct td)); return driver_register(&ohci_hcd_lh7a404_driver); } static void __exit ohci_hcd_lh7a404_cleanup (void) { driver_unregister(&ohci_hcd_lh7a404_driver); } module_init (ohci_hcd_lh7a404_init); module_exit (ohci_hcd_lh7a404_cleanup);