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/clk.h> 15 #include <linux/dma-mapping.h> 16 #include <linux/module.h> 17 #include <linux/of.h> 18 #include <linux/platform_device.h> 19 #include <linux/slab.h> 20 #include <linux/usb/xhci_pdriver.h> 21 22 #include "xhci.h" 23 #include "xhci-mvebu.h" 24 #include "xhci-rcar.h" 25 26 static struct hc_driver __read_mostly xhci_plat_hc_driver; 27 28 static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci) 29 { 30 /* 31 * As of now platform drivers don't provide MSI support so we ensure 32 * here that the generic code does not try to make a pci_dev from our 33 * dev struct in order to setup MSI 34 */ 35 xhci->quirks |= XHCI_PLAT; 36 } 37 38 /* called during probe() after chip reset completes */ 39 static int xhci_plat_setup(struct usb_hcd *hcd) 40 { 41 struct device_node *of_node = hcd->self.controller->of_node; 42 int ret; 43 44 if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") || 45 of_device_is_compatible(of_node, "renesas,xhci-r8a7791")) { 46 ret = xhci_rcar_init_quirk(hcd); 47 if (ret) 48 return ret; 49 } 50 51 return xhci_gen_setup(hcd, xhci_plat_quirks); 52 } 53 54 static int xhci_plat_start(struct usb_hcd *hcd) 55 { 56 struct device_node *of_node = hcd->self.controller->of_node; 57 58 if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") || 59 of_device_is_compatible(of_node, "renesas,xhci-r8a7791")) 60 xhci_rcar_start(hcd); 61 62 return xhci_run(hcd); 63 } 64 65 static int xhci_plat_probe(struct platform_device *pdev) 66 { 67 struct device_node *node = pdev->dev.of_node; 68 struct usb_xhci_pdata *pdata = dev_get_platdata(&pdev->dev); 69 const struct hc_driver *driver; 70 struct xhci_hcd *xhci; 71 struct resource *res; 72 struct usb_hcd *hcd; 73 struct clk *clk; 74 int ret; 75 int irq; 76 77 if (usb_disabled()) 78 return -ENODEV; 79 80 driver = &xhci_plat_hc_driver; 81 82 irq = platform_get_irq(pdev, 0); 83 if (irq < 0) 84 return -ENODEV; 85 86 87 if (of_device_is_compatible(pdev->dev.of_node, 88 "marvell,armada-375-xhci") || 89 of_device_is_compatible(pdev->dev.of_node, 90 "marvell,armada-380-xhci")) { 91 ret = xhci_mvebu_mbus_init_quirk(pdev); 92 if (ret) 93 return ret; 94 } 95 96 /* Initialize dma_mask and coherent_dma_mask to 32-bits */ 97 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); 98 if (ret) 99 return ret; 100 if (!pdev->dev.dma_mask) 101 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; 102 else 103 dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)); 104 105 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); 106 if (!hcd) 107 return -ENOMEM; 108 109 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 110 hcd->regs = devm_ioremap_resource(&pdev->dev, res); 111 if (IS_ERR(hcd->regs)) { 112 ret = PTR_ERR(hcd->regs); 113 goto put_hcd; 114 } 115 116 hcd->rsrc_start = res->start; 117 hcd->rsrc_len = resource_size(res); 118 119 /* 120 * Not all platforms have a clk so it is not an error if the 121 * clock does not exists. 122 */ 123 clk = devm_clk_get(&pdev->dev, NULL); 124 if (!IS_ERR(clk)) { 125 ret = clk_prepare_enable(clk); 126 if (ret) 127 goto put_hcd; 128 } 129 130 ret = usb_add_hcd(hcd, irq, IRQF_SHARED); 131 if (ret) 132 goto disable_clk; 133 134 device_wakeup_enable(hcd->self.controller); 135 136 /* USB 2.0 roothub is stored in the platform_device now. */ 137 hcd = platform_get_drvdata(pdev); 138 xhci = hcd_to_xhci(hcd); 139 xhci->clk = clk; 140 xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev, 141 dev_name(&pdev->dev), hcd); 142 if (!xhci->shared_hcd) { 143 ret = -ENOMEM; 144 goto dealloc_usb2_hcd; 145 } 146 147 if ((node && of_property_read_bool(node, "usb3-lpm-capable")) || 148 (pdata && pdata->usb3_lpm_capable)) 149 xhci->quirks |= XHCI_LPM_SUPPORT; 150 /* 151 * Set the xHCI pointer before xhci_plat_setup() (aka hcd_driver.reset) 152 * is called by usb_add_hcd(). 153 */ 154 *((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci; 155 156 if (HCC_MAX_PSA(xhci->hcc_params) >= 4) 157 xhci->shared_hcd->can_do_streams = 1; 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 disable_clk: 172 if (!IS_ERR(clk)) 173 clk_disable_unprepare(clk); 174 175 put_hcd: 176 usb_put_hcd(hcd); 177 178 return ret; 179 } 180 181 static int xhci_plat_remove(struct platform_device *dev) 182 { 183 struct usb_hcd *hcd = platform_get_drvdata(dev); 184 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 185 struct clk *clk = xhci->clk; 186 187 usb_remove_hcd(xhci->shared_hcd); 188 usb_put_hcd(xhci->shared_hcd); 189 190 usb_remove_hcd(hcd); 191 if (!IS_ERR(clk)) 192 clk_disable_unprepare(clk); 193 usb_put_hcd(hcd); 194 kfree(xhci); 195 196 return 0; 197 } 198 199 #ifdef CONFIG_PM_SLEEP 200 static int xhci_plat_suspend(struct device *dev) 201 { 202 struct usb_hcd *hcd = dev_get_drvdata(dev); 203 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 204 205 /* 206 * xhci_suspend() needs `do_wakeup` to know whether host is allowed 207 * to do wakeup during suspend. Since xhci_plat_suspend is currently 208 * only designed for system suspend, device_may_wakeup() is enough 209 * to dertermine whether host is allowed to do wakeup. Need to 210 * reconsider this when xhci_plat_suspend enlarges its scope, e.g., 211 * also applies to runtime suspend. 212 */ 213 return xhci_suspend(xhci, device_may_wakeup(dev)); 214 } 215 216 static int xhci_plat_resume(struct device *dev) 217 { 218 struct usb_hcd *hcd = dev_get_drvdata(dev); 219 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 220 221 return xhci_resume(xhci, 0); 222 } 223 224 static const struct dev_pm_ops xhci_plat_pm_ops = { 225 SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume) 226 }; 227 #define DEV_PM_OPS (&xhci_plat_pm_ops) 228 #else 229 #define DEV_PM_OPS NULL 230 #endif /* CONFIG_PM */ 231 232 #ifdef CONFIG_OF 233 static const struct of_device_id usb_xhci_of_match[] = { 234 { .compatible = "generic-xhci" }, 235 { .compatible = "xhci-platform" }, 236 { .compatible = "marvell,armada-375-xhci"}, 237 { .compatible = "marvell,armada-380-xhci"}, 238 { .compatible = "renesas,xhci-r8a7790"}, 239 { .compatible = "renesas,xhci-r8a7791"}, 240 { }, 241 }; 242 MODULE_DEVICE_TABLE(of, usb_xhci_of_match); 243 #endif 244 245 static struct platform_driver usb_xhci_driver = { 246 .probe = xhci_plat_probe, 247 .remove = xhci_plat_remove, 248 .driver = { 249 .name = "xhci-hcd", 250 .pm = DEV_PM_OPS, 251 .of_match_table = of_match_ptr(usb_xhci_of_match), 252 }, 253 }; 254 MODULE_ALIAS("platform:xhci-hcd"); 255 256 static int __init xhci_plat_init(void) 257 { 258 xhci_init_driver(&xhci_plat_hc_driver, xhci_plat_setup); 259 xhci_plat_hc_driver.start = xhci_plat_start; 260 return platform_driver_register(&usb_xhci_driver); 261 } 262 module_init(xhci_plat_init); 263 264 static void __exit xhci_plat_exit(void) 265 { 266 platform_driver_unregister(&usb_xhci_driver); 267 } 268 module_exit(xhci_plat_exit); 269 270 MODULE_DESCRIPTION("xHCI Platform Host Controller Driver"); 271 MODULE_LICENSE("GPL"); 272