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 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); 81 if (ret) 82 return ret; 83 84 hcd = usb_create_hcd(&uhci_platform_hc_driver, &pdev->dev, 85 pdev->name); 86 if (!hcd) 87 return -ENOMEM; 88 89 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 90 hcd->rsrc_start = res->start; 91 hcd->rsrc_len = resource_size(res); 92 93 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { 94 pr_err("%s: request_mem_region failed\n", __func__); 95 ret = -EBUSY; 96 goto err_rmr; 97 } 98 99 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); 100 if (!hcd->regs) { 101 pr_err("%s: ioremap failed\n", __func__); 102 ret = -ENOMEM; 103 goto err_irq; 104 } 105 uhci = hcd_to_uhci(hcd); 106 107 uhci->regs = hcd->regs; 108 109 ret = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_DISABLED | 110 IRQF_SHARED); 111 if (ret) 112 goto err_uhci; 113 114 return 0; 115 116 err_uhci: 117 iounmap(hcd->regs); 118 err_irq: 119 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 120 err_rmr: 121 usb_put_hcd(hcd); 122 123 return ret; 124 } 125 126 static int uhci_hcd_platform_remove(struct platform_device *pdev) 127 { 128 struct usb_hcd *hcd = platform_get_drvdata(pdev); 129 130 usb_remove_hcd(hcd); 131 iounmap(hcd->regs); 132 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 133 usb_put_hcd(hcd); 134 135 return 0; 136 } 137 138 /* Make sure the controller is quiescent and that we're not using it 139 * any more. This is mainly for the benefit of programs which, like kexec, 140 * expect the hardware to be idle: not doing DMA or generating IRQs. 141 * 142 * This routine may be called in a damaged or failing kernel. Hence we 143 * do not acquire the spinlock before shutting down the controller. 144 */ 145 static void uhci_hcd_platform_shutdown(struct platform_device *op) 146 { 147 struct usb_hcd *hcd = platform_get_drvdata(op); 148 149 uhci_hc_died(hcd_to_uhci(hcd)); 150 } 151 152 static const struct of_device_id platform_uhci_ids[] = { 153 { .compatible = "platform-uhci", }, 154 {} 155 }; 156 157 static struct platform_driver uhci_platform_driver = { 158 .probe = uhci_hcd_platform_probe, 159 .remove = uhci_hcd_platform_remove, 160 .shutdown = uhci_hcd_platform_shutdown, 161 .driver = { 162 .name = "platform-uhci", 163 .owner = THIS_MODULE, 164 .of_match_table = platform_uhci_ids, 165 }, 166 }; 167