1 /* 2 * xhci-plat.c - xHCI host controller driver platform Bus Glue. 3 * 4 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com 5 * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> 6 * 7 * A lot of code borrowed from the Linux xHCI driver. 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * version 2 as published by the Free Software Foundation. 12 */ 13 14 #include <linux/platform_device.h> 15 #include <linux/module.h> 16 #include <linux/slab.h> 17 #include <linux/of.h> 18 #include <linux/dma-mapping.h> 19 20 #include "xhci.h" 21 22 static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci) 23 { 24 /* 25 * As of now platform drivers don't provide MSI support so we ensure 26 * here that the generic code does not try to make a pci_dev from our 27 * dev struct in order to setup MSI 28 */ 29 xhci->quirks |= XHCI_PLAT; 30 } 31 32 /* called during probe() after chip reset completes */ 33 static int xhci_plat_setup(struct usb_hcd *hcd) 34 { 35 return xhci_gen_setup(hcd, xhci_plat_quirks); 36 } 37 38 static const struct hc_driver xhci_plat_xhci_driver = { 39 .description = "xhci-hcd", 40 .product_desc = "xHCI Host Controller", 41 .hcd_priv_size = sizeof(struct xhci_hcd *), 42 43 /* 44 * generic hardware linkage 45 */ 46 .irq = xhci_irq, 47 .flags = HCD_MEMORY | HCD_USB3 | HCD_SHARED, 48 49 /* 50 * basic lifecycle operations 51 */ 52 .reset = xhci_plat_setup, 53 .start = xhci_run, 54 .stop = xhci_stop, 55 .shutdown = xhci_shutdown, 56 57 /* 58 * managing i/o requests and associated device resources 59 */ 60 .urb_enqueue = xhci_urb_enqueue, 61 .urb_dequeue = xhci_urb_dequeue, 62 .alloc_dev = xhci_alloc_dev, 63 .free_dev = xhci_free_dev, 64 .alloc_streams = xhci_alloc_streams, 65 .free_streams = xhci_free_streams, 66 .add_endpoint = xhci_add_endpoint, 67 .drop_endpoint = xhci_drop_endpoint, 68 .endpoint_reset = xhci_endpoint_reset, 69 .check_bandwidth = xhci_check_bandwidth, 70 .reset_bandwidth = xhci_reset_bandwidth, 71 .address_device = xhci_address_device, 72 .update_hub_device = xhci_update_hub_device, 73 .reset_device = xhci_discover_or_reset_device, 74 75 /* 76 * scheduling support 77 */ 78 .get_frame_number = xhci_get_frame, 79 80 /* Root hub support */ 81 .hub_control = xhci_hub_control, 82 .hub_status_data = xhci_hub_status_data, 83 .bus_suspend = xhci_bus_suspend, 84 .bus_resume = xhci_bus_resume, 85 }; 86 87 static int xhci_plat_probe(struct platform_device *pdev) 88 { 89 const struct hc_driver *driver; 90 struct xhci_hcd *xhci; 91 struct resource *res; 92 struct usb_hcd *hcd; 93 int ret; 94 int irq; 95 96 if (usb_disabled()) 97 return -ENODEV; 98 99 driver = &xhci_plat_xhci_driver; 100 101 irq = platform_get_irq(pdev, 0); 102 if (irq < 0) 103 return -ENODEV; 104 105 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 106 if (!res) 107 return -ENODEV; 108 109 /* Initialize dma_mask and coherent_dma_mask to 32-bits */ 110 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); 111 if (ret) 112 return ret; 113 if (!pdev->dev.dma_mask) 114 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; 115 else 116 dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)); 117 118 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); 119 if (!hcd) 120 return -ENOMEM; 121 122 hcd->rsrc_start = res->start; 123 hcd->rsrc_len = resource_size(res); 124 125 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, 126 driver->description)) { 127 dev_dbg(&pdev->dev, "controller already in use\n"); 128 ret = -EBUSY; 129 goto put_hcd; 130 } 131 132 hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len); 133 if (!hcd->regs) { 134 dev_dbg(&pdev->dev, "error mapping memory\n"); 135 ret = -EFAULT; 136 goto release_mem_region; 137 } 138 139 ret = usb_add_hcd(hcd, irq, IRQF_SHARED); 140 if (ret) 141 goto unmap_registers; 142 143 /* USB 2.0 roothub is stored in the platform_device now. */ 144 hcd = platform_get_drvdata(pdev); 145 xhci = hcd_to_xhci(hcd); 146 xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev, 147 dev_name(&pdev->dev), hcd); 148 if (!xhci->shared_hcd) { 149 ret = -ENOMEM; 150 goto dealloc_usb2_hcd; 151 } 152 153 /* 154 * Set the xHCI pointer before xhci_plat_setup() (aka hcd_driver.reset) 155 * is called by usb_add_hcd(). 156 */ 157 *((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci; 158 159 ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED); 160 if (ret) 161 goto put_usb3_hcd; 162 163 return 0; 164 165 put_usb3_hcd: 166 usb_put_hcd(xhci->shared_hcd); 167 168 dealloc_usb2_hcd: 169 usb_remove_hcd(hcd); 170 171 unmap_registers: 172 iounmap(hcd->regs); 173 174 release_mem_region: 175 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 176 177 put_hcd: 178 usb_put_hcd(hcd); 179 180 return ret; 181 } 182 183 static int xhci_plat_remove(struct platform_device *dev) 184 { 185 struct usb_hcd *hcd = platform_get_drvdata(dev); 186 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 187 188 usb_remove_hcd(xhci->shared_hcd); 189 usb_put_hcd(xhci->shared_hcd); 190 191 usb_remove_hcd(hcd); 192 iounmap(hcd->regs); 193 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 194 usb_put_hcd(hcd); 195 kfree(xhci); 196 197 return 0; 198 } 199 200 #ifdef CONFIG_PM 201 static int xhci_plat_suspend(struct device *dev) 202 { 203 struct usb_hcd *hcd = dev_get_drvdata(dev); 204 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 205 206 return xhci_suspend(xhci); 207 } 208 209 static int xhci_plat_resume(struct device *dev) 210 { 211 struct usb_hcd *hcd = dev_get_drvdata(dev); 212 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 213 214 return xhci_resume(xhci, 0); 215 } 216 217 static const struct dev_pm_ops xhci_plat_pm_ops = { 218 SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume) 219 }; 220 #define DEV_PM_OPS (&xhci_plat_pm_ops) 221 #else 222 #define DEV_PM_OPS NULL 223 #endif /* CONFIG_PM */ 224 225 #ifdef CONFIG_OF 226 static const struct of_device_id usb_xhci_of_match[] = { 227 { .compatible = "xhci-platform" }, 228 { }, 229 }; 230 MODULE_DEVICE_TABLE(of, usb_xhci_of_match); 231 #endif 232 233 static struct platform_driver usb_xhci_driver = { 234 .probe = xhci_plat_probe, 235 .remove = xhci_plat_remove, 236 .driver = { 237 .name = "xhci-hcd", 238 .pm = DEV_PM_OPS, 239 .of_match_table = of_match_ptr(usb_xhci_of_match), 240 }, 241 }; 242 MODULE_ALIAS("platform:xhci-hcd"); 243 244 int xhci_register_plat(void) 245 { 246 return platform_driver_register(&usb_xhci_driver); 247 } 248 249 void xhci_unregister_plat(void) 250 { 251 platform_driver_unregister(&usb_xhci_driver); 252 } 253