1 /* 2 * Generic UHCI HCD (Host Controller Driver) for Platform Devices 3 * 4 * Copyright (c) 2011 Tony Prisk <linux@prisktech.co.nz> 5 * 6 * This file is based on uhci-grlib.c 7 * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu 8 */ 9 10 #include <linux/of.h> 11 #include <linux/platform_device.h> 12 13 static int uhci_platform_init(struct usb_hcd *hcd) 14 { 15 struct uhci_hcd *uhci = hcd_to_uhci(hcd); 16 17 uhci->rh_numports = uhci_count_ports(hcd); 18 19 /* Set up pointers to to generic functions */ 20 uhci->reset_hc = uhci_generic_reset_hc; 21 uhci->check_and_reset_hc = uhci_generic_check_and_reset_hc; 22 23 /* No special actions need to be taken for the functions below */ 24 uhci->configure_hc = NULL; 25 uhci->resume_detect_interrupts_are_broken = NULL; 26 uhci->global_suspend_mode_is_broken = NULL; 27 28 /* Reset if the controller isn't already safely quiescent. */ 29 check_and_reset_hc(uhci); 30 return 0; 31 } 32 33 static const struct hc_driver uhci_platform_hc_driver = { 34 .description = hcd_name, 35 .product_desc = "Generic UHCI Host Controller", 36 .hcd_priv_size = sizeof(struct uhci_hcd), 37 38 /* Generic hardware linkage */ 39 .irq = uhci_irq, 40 .flags = HCD_MEMORY | HCD_USB11, 41 42 /* Basic lifecycle operations */ 43 .reset = uhci_platform_init, 44 .start = uhci_start, 45 #ifdef CONFIG_PM 46 .pci_suspend = NULL, 47 .pci_resume = NULL, 48 .bus_suspend = uhci_rh_suspend, 49 .bus_resume = uhci_rh_resume, 50 #endif 51 .stop = uhci_stop, 52 53 .urb_enqueue = uhci_urb_enqueue, 54 .urb_dequeue = uhci_urb_dequeue, 55 56 .endpoint_disable = uhci_hcd_endpoint_disable, 57 .get_frame_number = uhci_hcd_get_frame_number, 58 59 .hub_status_data = uhci_hub_status_data, 60 .hub_control = uhci_hub_control, 61 }; 62 63 64 static int __devinit uhci_hcd_platform_probe(struct platform_device *pdev) 65 { 66 struct usb_hcd *hcd; 67 struct uhci_hcd *uhci; 68 struct resource *res; 69 int ret; 70 71 if (usb_disabled()) 72 return -ENODEV; 73 74 hcd = usb_create_hcd(&uhci_platform_hc_driver, &pdev->dev, 75 pdev->name); 76 if (!hcd) 77 return -ENOMEM; 78 79 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 80 hcd->rsrc_start = res->start; 81 hcd->rsrc_len = resource_size(res); 82 83 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { 84 pr_err("%s: request_mem_region failed\n", __func__); 85 ret = -EBUSY; 86 goto err_rmr; 87 } 88 89 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); 90 if (!hcd->regs) { 91 pr_err("%s: ioremap failed\n", __func__); 92 ret = -ENOMEM; 93 goto err_irq; 94 } 95 uhci = hcd_to_uhci(hcd); 96 97 uhci->regs = hcd->regs; 98 99 ret = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_DISABLED | 100 IRQF_SHARED); 101 if (ret) 102 goto err_uhci; 103 104 return 0; 105 106 err_uhci: 107 iounmap(hcd->regs); 108 err_irq: 109 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 110 err_rmr: 111 usb_put_hcd(hcd); 112 113 return ret; 114 } 115 116 static int uhci_hcd_platform_remove(struct platform_device *pdev) 117 { 118 struct usb_hcd *hcd = platform_get_drvdata(pdev); 119 120 usb_remove_hcd(hcd); 121 iounmap(hcd->regs); 122 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 123 usb_put_hcd(hcd); 124 platform_set_drvdata(pdev, NULL); 125 126 return 0; 127 } 128 129 /* Make sure the controller is quiescent and that we're not using it 130 * any more. This is mainly for the benefit of programs which, like kexec, 131 * expect the hardware to be idle: not doing DMA or generating IRQs. 132 * 133 * This routine may be called in a damaged or failing kernel. Hence we 134 * do not acquire the spinlock before shutting down the controller. 135 */ 136 static void uhci_hcd_platform_shutdown(struct platform_device *op) 137 { 138 struct usb_hcd *hcd = dev_get_drvdata(&op->dev); 139 140 uhci_hc_died(hcd_to_uhci(hcd)); 141 } 142 143 static const struct of_device_id platform_uhci_ids[] = { 144 { .compatible = "platform-uhci", }, 145 {} 146 }; 147 148 static struct platform_driver uhci_platform_driver = { 149 .probe = uhci_hcd_platform_probe, 150 .remove = uhci_hcd_platform_remove, 151 .shutdown = uhci_hcd_platform_shutdown, 152 .driver = { 153 .name = "platform-uhci", 154 .owner = THIS_MODULE, 155 .of_match_table = of_match_ptr(platform_uhci_ids), 156 }, 157 }; 158