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 .enable_device = xhci_enable_device, 73 .update_hub_device = xhci_update_hub_device, 74 .reset_device = xhci_discover_or_reset_device, 75 76 /* 77 * scheduling support 78 */ 79 .get_frame_number = xhci_get_frame, 80 81 /* Root hub support */ 82 .hub_control = xhci_hub_control, 83 .hub_status_data = xhci_hub_status_data, 84 .bus_suspend = xhci_bus_suspend, 85 .bus_resume = xhci_bus_resume, 86 }; 87 88 static int xhci_plat_probe(struct platform_device *pdev) 89 { 90 const struct hc_driver *driver; 91 struct xhci_hcd *xhci; 92 struct resource *res; 93 struct usb_hcd *hcd; 94 int ret; 95 int irq; 96 97 if (usb_disabled()) 98 return -ENODEV; 99 100 driver = &xhci_plat_xhci_driver; 101 102 irq = platform_get_irq(pdev, 0); 103 if (irq < 0) 104 return -ENODEV; 105 106 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 107 if (!res) 108 return -ENODEV; 109 110 /* Initialize dma_mask and coherent_dma_mask to 32-bits */ 111 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); 112 if (ret) 113 return ret; 114 if (!pdev->dev.dma_mask) 115 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; 116 else 117 dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)); 118 119 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); 120 if (!hcd) 121 return -ENOMEM; 122 123 hcd->rsrc_start = res->start; 124 hcd->rsrc_len = resource_size(res); 125 126 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, 127 driver->description)) { 128 dev_dbg(&pdev->dev, "controller already in use\n"); 129 ret = -EBUSY; 130 goto put_hcd; 131 } 132 133 hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len); 134 if (!hcd->regs) { 135 dev_dbg(&pdev->dev, "error mapping memory\n"); 136 ret = -EFAULT; 137 goto release_mem_region; 138 } 139 140 ret = usb_add_hcd(hcd, irq, IRQF_SHARED); 141 if (ret) 142 goto unmap_registers; 143 device_wakeup_enable(hcd->self.controller); 144 145 /* USB 2.0 roothub is stored in the platform_device now. */ 146 hcd = platform_get_drvdata(pdev); 147 xhci = hcd_to_xhci(hcd); 148 xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev, 149 dev_name(&pdev->dev), hcd); 150 if (!xhci->shared_hcd) { 151 ret = -ENOMEM; 152 goto dealloc_usb2_hcd; 153 } 154 155 /* 156 * Set the xHCI pointer before xhci_plat_setup() (aka hcd_driver.reset) 157 * is called by usb_add_hcd(). 158 */ 159 *((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci; 160 161 if (HCC_MAX_PSA(xhci->hcc_params) >= 4) 162 xhci->shared_hcd->can_do_streams = 1; 163 164 ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED); 165 if (ret) 166 goto put_usb3_hcd; 167 168 return 0; 169 170 put_usb3_hcd: 171 usb_put_hcd(xhci->shared_hcd); 172 173 dealloc_usb2_hcd: 174 usb_remove_hcd(hcd); 175 176 unmap_registers: 177 iounmap(hcd->regs); 178 179 release_mem_region: 180 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 181 182 put_hcd: 183 usb_put_hcd(hcd); 184 185 return ret; 186 } 187 188 static int xhci_plat_remove(struct platform_device *dev) 189 { 190 struct usb_hcd *hcd = platform_get_drvdata(dev); 191 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 192 193 usb_remove_hcd(xhci->shared_hcd); 194 usb_put_hcd(xhci->shared_hcd); 195 196 usb_remove_hcd(hcd); 197 iounmap(hcd->regs); 198 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 199 usb_put_hcd(hcd); 200 kfree(xhci); 201 202 return 0; 203 } 204 205 #ifdef CONFIG_PM 206 static int xhci_plat_suspend(struct device *dev) 207 { 208 struct usb_hcd *hcd = dev_get_drvdata(dev); 209 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 210 211 return xhci_suspend(xhci); 212 } 213 214 static int xhci_plat_resume(struct device *dev) 215 { 216 struct usb_hcd *hcd = dev_get_drvdata(dev); 217 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 218 219 return xhci_resume(xhci, 0); 220 } 221 222 static const struct dev_pm_ops xhci_plat_pm_ops = { 223 SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume) 224 }; 225 #define DEV_PM_OPS (&xhci_plat_pm_ops) 226 #else 227 #define DEV_PM_OPS NULL 228 #endif /* CONFIG_PM */ 229 230 #ifdef CONFIG_OF 231 static const struct of_device_id usb_xhci_of_match[] = { 232 { .compatible = "generic-xhci" }, 233 { .compatible = "xhci-platform" }, 234 { }, 235 }; 236 MODULE_DEVICE_TABLE(of, usb_xhci_of_match); 237 #endif 238 239 static struct platform_driver usb_xhci_driver = { 240 .probe = xhci_plat_probe, 241 .remove = xhci_plat_remove, 242 .driver = { 243 .name = "xhci-hcd", 244 .pm = DEV_PM_OPS, 245 .of_match_table = of_match_ptr(usb_xhci_of_match), 246 }, 247 }; 248 MODULE_ALIAS("platform:xhci-hcd"); 249 250 int xhci_register_plat(void) 251 { 252 return platform_driver_register(&usb_xhci_driver); 253 } 254 255 void xhci_unregister_plat(void) 256 { 257 platform_driver_unregister(&usb_xhci_driver); 258 } 259