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 static int uhci_hcd_platform_probe(struct platform_device *pdev) 64 { 65 struct usb_hcd *hcd; 66 struct uhci_hcd *uhci; 67 struct resource *res; 68 int ret; 69 70 if (usb_disabled()) 71 return -ENODEV; 72 73 /* 74 * Right now device-tree probed devices don't get dma_mask set. 75 * Since shared usb code relies on it, set it here for now. 76 * Once we have dma capability bindings this can go away. 77 */ 78 if (!pdev->dev.dma_mask) 79 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; 80 if (!pdev->dev.coherent_dma_mask) 81 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); 82 83 hcd = usb_create_hcd(&uhci_platform_hc_driver, &pdev->dev, 84 pdev->name); 85 if (!hcd) 86 return -ENOMEM; 87 88 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 89 hcd->rsrc_start = res->start; 90 hcd->rsrc_len = resource_size(res); 91 92 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { 93 pr_err("%s: request_mem_region failed\n", __func__); 94 ret = -EBUSY; 95 goto err_rmr; 96 } 97 98 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); 99 if (!hcd->regs) { 100 pr_err("%s: ioremap failed\n", __func__); 101 ret = -ENOMEM; 102 goto err_irq; 103 } 104 uhci = hcd_to_uhci(hcd); 105 106 uhci->regs = hcd->regs; 107 108 ret = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED); 109 if (ret) 110 goto err_uhci; 111 112 return 0; 113 114 err_uhci: 115 iounmap(hcd->regs); 116 err_irq: 117 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 118 err_rmr: 119 usb_put_hcd(hcd); 120 121 return ret; 122 } 123 124 static int uhci_hcd_platform_remove(struct platform_device *pdev) 125 { 126 struct usb_hcd *hcd = platform_get_drvdata(pdev); 127 128 usb_remove_hcd(hcd); 129 iounmap(hcd->regs); 130 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 131 usb_put_hcd(hcd); 132 133 return 0; 134 } 135 136 /* Make sure the controller is quiescent and that we're not using it 137 * any more. This is mainly for the benefit of programs which, like kexec, 138 * expect the hardware to be idle: not doing DMA or generating IRQs. 139 * 140 * This routine may be called in a damaged or failing kernel. Hence we 141 * do not acquire the spinlock before shutting down the controller. 142 */ 143 static void uhci_hcd_platform_shutdown(struct platform_device *op) 144 { 145 struct usb_hcd *hcd = platform_get_drvdata(op); 146 147 uhci_hc_died(hcd_to_uhci(hcd)); 148 } 149 150 static const struct of_device_id platform_uhci_ids[] = { 151 { .compatible = "platform-uhci", }, 152 {} 153 }; 154 155 static struct platform_driver uhci_platform_driver = { 156 .probe = uhci_hcd_platform_probe, 157 .remove = uhci_hcd_platform_remove, 158 .shutdown = uhci_hcd_platform_shutdown, 159 .driver = { 160 .name = "platform-uhci", 161 .owner = THIS_MODULE, 162 .of_match_table = platform_uhci_ids, 163 }, 164 }; 165