/* * OHCI HCD (Host Controller Driver) for USB. * * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> * (C) Copyright 2000-2005 David Brownell * (C) Copyright 2002 Hewlett-Packard Company * (C) Copyright 2008 Magnus Damm * * SM501 Bus Glue - based on ohci-omap.c * * This file is licenced under the GPL. */ #include <linux/interrupt.h> #include <linux/jiffies.h> #include <linux/platform_device.h> #include <linux/dma-mapping.h> #include <linux/sm501.h> #include <linux/sm501-regs.h> static int ohci_sm501_init(struct usb_hcd *hcd) { return ohci_init(hcd_to_ohci(hcd)); } static int ohci_sm501_start(struct usb_hcd *hcd) { struct device *dev = hcd->self.controller; int ret; ret = ohci_run(hcd_to_ohci(hcd)); if (ret < 0) { dev_err(dev, "can't start %s", hcd->self.bus_name); ohci_stop(hcd); } return ret; } /*-------------------------------------------------------------------------*/ static const struct hc_driver ohci_sm501_hc_driver = { .description = hcd_name, .product_desc = "SM501 OHCI", .hcd_priv_size = sizeof(struct ohci_hcd), /* * generic hardware linkage */ .irq = ohci_irq, .flags = HCD_USB11 | HCD_MEMORY | HCD_LOCAL_MEM, /* * basic lifecycle operations */ .reset = ohci_sm501_init, .start = ohci_sm501_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_sm501_drv_probe(struct platform_device *pdev) { const struct hc_driver *driver = &ohci_sm501_hc_driver; struct device *dev = &pdev->dev; struct resource *res, *mem; int retval, irq; struct usb_hcd *hcd = NULL; irq = retval = platform_get_irq(pdev, 0); if (retval < 0) goto err0; mem = platform_get_resource(pdev, IORESOURCE_MEM, 1); if (mem == NULL) { dev_err(dev, "no resource definition for memory\n"); retval = -ENOENT; goto err0; } if (!request_mem_region(mem->start, mem->end - mem->start + 1, pdev->name)) { dev_err(dev, "request_mem_region failed\n"); retval = -EBUSY; goto err0; } /* The sm501 chip is equipped with local memory that may be used * by on-chip devices such as the video controller and the usb host. * This driver uses dma_declare_coherent_memory() to make sure * usb allocations with dma_alloc_coherent() allocate from * this local memory. The dma_handle returned by dma_alloc_coherent() * will be an offset starting from 0 for the first local memory byte. * * So as long as data is allocated using dma_alloc_coherent() all is * fine. This is however not always the case - buffers may be allocated * using kmalloc() - so the usb core needs to be told that it must copy * data into our local memory if the buffers happen to be placed in * regular memory. The HCD_LOCAL_MEM flag does just that. */ if (!dma_declare_coherent_memory(dev, mem->start, mem->start - mem->parent->start, (mem->end - mem->start) + 1, DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE)) { dev_err(dev, "cannot declare coherent memory\n"); retval = -ENXIO; goto err1; } /* allocate, reserve and remap resources for registers */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (res == NULL) { dev_err(dev, "no resource definition for registers\n"); retval = -ENOENT; goto err2; } hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); if (!hcd) { retval = -ENOMEM; goto err2; } hcd->rsrc_start = res->start; hcd->rsrc_len = res->end - res->start + 1; if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, pdev->name)) { dev_err(dev, "request_mem_region failed\n"); retval = -EBUSY; goto err3; } hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); if (hcd->regs == NULL) { dev_err(dev, "cannot remap registers\n"); retval = -ENXIO; goto err4; } ohci_hcd_init(hcd_to_ohci(hcd)); retval = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED); if (retval) goto err5; /* enable power and unmask interrupts */ sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1); sm501_modify_reg(dev->parent, SM501_IRQ_MASK, 1 << 6, 0); return 0; err5: iounmap(hcd->regs); err4: release_mem_region(hcd->rsrc_start, hcd->rsrc_len); err3: usb_put_hcd(hcd); err2: dma_release_declared_memory(dev); err1: release_mem_region(mem->start, mem->end - mem->start + 1); err0: return retval; } static int ohci_hcd_sm501_drv_remove(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); struct resource *mem; usb_remove_hcd(hcd); release_mem_region(hcd->rsrc_start, hcd->rsrc_len); usb_put_hcd(hcd); dma_release_declared_memory(&pdev->dev); mem = platform_get_resource(pdev, IORESOURCE_MEM, 1); if (mem) release_mem_region(mem->start, mem->end - mem->start + 1); /* mask interrupts and disable power */ sm501_modify_reg(pdev->dev.parent, SM501_IRQ_MASK, 0, 1 << 6); sm501_unit_power(pdev->dev.parent, SM501_GATE_USB_HOST, 0); platform_set_drvdata(pdev, NULL); return 0; } /*-------------------------------------------------------------------------*/ #ifdef CONFIG_PM static int ohci_sm501_suspend(struct platform_device *pdev, pm_message_t msg) { struct device *dev = &pdev->dev; struct ohci_hcd *ohci = hcd_to_ohci(platform_get_drvdata(pdev)); if (time_before(jiffies, ohci->next_statechange)) msleep(5); ohci->next_statechange = jiffies; sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 0); ohci_to_hcd(ohci)->state = HC_STATE_SUSPENDED; return 0; } static int ohci_sm501_resume(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct usb_hcd *hcd = platform_get_drvdata(pdev); struct ohci_hcd *ohci = hcd_to_ohci(hcd); if (time_before(jiffies, ohci->next_statechange)) msleep(5); ohci->next_statechange = jiffies; sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1); ohci_finish_controller_resume(hcd); return 0; } #else #define ohci_sm501_suspend NULL #define ohci_sm501_resume NULL #endif /*-------------------------------------------------------------------------*/ /* * Driver definition to register with the SM501 bus */ static struct platform_driver ohci_hcd_sm501_driver = { .probe = ohci_hcd_sm501_drv_probe, .remove = ohci_hcd_sm501_drv_remove, .shutdown = usb_hcd_platform_shutdown, .suspend = ohci_sm501_suspend, .resume = ohci_sm501_resume, .driver = { .owner = THIS_MODULE, .name = "sm501-usb", }, }; MODULE_ALIAS("platform:sm501-usb");