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/usb/phy.h> 20 #include <linux/slab.h> 21 #include <linux/usb/xhci_pdriver.h> 22 23 #include "xhci.h" 24 #include "xhci-mvebu.h" 25 #include "xhci-rcar.h" 26 27 static struct hc_driver __read_mostly xhci_plat_hc_driver; 28 29 static int xhci_plat_setup(struct usb_hcd *hcd); 30 static int xhci_plat_start(struct usb_hcd *hcd); 31 32 static const struct xhci_driver_overrides xhci_plat_overrides __initconst = { 33 .extra_priv_size = sizeof(struct xhci_hcd), 34 .reset = xhci_plat_setup, 35 .start = xhci_plat_start, 36 }; 37 38 static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci) 39 { 40 /* 41 * As of now platform drivers don't provide MSI support so we ensure 42 * here that the generic code does not try to make a pci_dev from our 43 * dev struct in order to setup MSI 44 */ 45 xhci->quirks |= XHCI_PLAT; 46 } 47 48 /* called during probe() after chip reset completes */ 49 static int xhci_plat_setup(struct usb_hcd *hcd) 50 { 51 struct device_node *of_node = hcd->self.controller->of_node; 52 int ret; 53 54 if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") || 55 of_device_is_compatible(of_node, "renesas,xhci-r8a7791")) { 56 ret = xhci_rcar_init_quirk(hcd); 57 if (ret) 58 return ret; 59 } 60 61 return xhci_gen_setup(hcd, xhci_plat_quirks); 62 } 63 64 static int xhci_plat_start(struct usb_hcd *hcd) 65 { 66 struct device_node *of_node = hcd->self.controller->of_node; 67 68 if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") || 69 of_device_is_compatible(of_node, "renesas,xhci-r8a7791")) 70 xhci_rcar_start(hcd); 71 72 return xhci_run(hcd); 73 } 74 75 static int xhci_plat_probe(struct platform_device *pdev) 76 { 77 struct device_node *node = pdev->dev.of_node; 78 struct usb_xhci_pdata *pdata = dev_get_platdata(&pdev->dev); 79 const struct hc_driver *driver; 80 struct xhci_hcd *xhci; 81 struct resource *res; 82 struct usb_hcd *hcd; 83 struct clk *clk; 84 int ret; 85 int irq; 86 87 if (usb_disabled()) 88 return -ENODEV; 89 90 driver = &xhci_plat_hc_driver; 91 92 irq = platform_get_irq(pdev, 0); 93 if (irq < 0) 94 return -ENODEV; 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 if (of_device_is_compatible(pdev->dev.of_node, 131 "marvell,armada-375-xhci") || 132 of_device_is_compatible(pdev->dev.of_node, 133 "marvell,armada-380-xhci")) { 134 ret = xhci_mvebu_mbus_init_quirk(pdev); 135 if (ret) 136 goto disable_clk; 137 } 138 139 device_wakeup_enable(hcd->self.controller); 140 141 xhci = hcd_to_xhci(hcd); 142 xhci->clk = clk; 143 xhci->main_hcd = hcd; 144 xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev, 145 dev_name(&pdev->dev), hcd); 146 if (!xhci->shared_hcd) { 147 ret = -ENOMEM; 148 goto disable_clk; 149 } 150 151 if ((node && of_property_read_bool(node, "usb3-lpm-capable")) || 152 (pdata && pdata->usb3_lpm_capable)) 153 xhci->quirks |= XHCI_LPM_SUPPORT; 154 155 if (HCC_MAX_PSA(xhci->hcc_params) >= 4) 156 xhci->shared_hcd->can_do_streams = 1; 157 158 hcd->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0); 159 if (IS_ERR(hcd->usb_phy)) { 160 ret = PTR_ERR(hcd->usb_phy); 161 if (ret == -EPROBE_DEFER) 162 goto put_usb3_hcd; 163 hcd->usb_phy = NULL; 164 } else { 165 ret = usb_phy_init(hcd->usb_phy); 166 if (ret) 167 goto put_usb3_hcd; 168 } 169 170 ret = usb_add_hcd(hcd, irq, IRQF_SHARED); 171 if (ret) 172 goto disable_usb_phy; 173 174 ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED); 175 if (ret) 176 goto dealloc_usb2_hcd; 177 178 return 0; 179 180 181 dealloc_usb2_hcd: 182 usb_remove_hcd(hcd); 183 184 disable_usb_phy: 185 usb_phy_shutdown(hcd->usb_phy); 186 187 put_usb3_hcd: 188 usb_put_hcd(xhci->shared_hcd); 189 190 disable_clk: 191 if (!IS_ERR(clk)) 192 clk_disable_unprepare(clk); 193 194 put_hcd: 195 usb_put_hcd(hcd); 196 197 return ret; 198 } 199 200 static int xhci_plat_remove(struct platform_device *dev) 201 { 202 struct usb_hcd *hcd = platform_get_drvdata(dev); 203 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 204 struct clk *clk = xhci->clk; 205 206 usb_remove_hcd(xhci->shared_hcd); 207 usb_phy_shutdown(hcd->usb_phy); 208 209 usb_remove_hcd(hcd); 210 usb_put_hcd(xhci->shared_hcd); 211 212 if (!IS_ERR(clk)) 213 clk_disable_unprepare(clk); 214 usb_put_hcd(hcd); 215 216 return 0; 217 } 218 219 #ifdef CONFIG_PM_SLEEP 220 static int xhci_plat_suspend(struct device *dev) 221 { 222 struct usb_hcd *hcd = dev_get_drvdata(dev); 223 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 224 225 /* 226 * xhci_suspend() needs `do_wakeup` to know whether host is allowed 227 * to do wakeup during suspend. Since xhci_plat_suspend is currently 228 * only designed for system suspend, device_may_wakeup() is enough 229 * to dertermine whether host is allowed to do wakeup. Need to 230 * reconsider this when xhci_plat_suspend enlarges its scope, e.g., 231 * also applies to runtime suspend. 232 */ 233 return xhci_suspend(xhci, device_may_wakeup(dev)); 234 } 235 236 static int xhci_plat_resume(struct device *dev) 237 { 238 struct usb_hcd *hcd = dev_get_drvdata(dev); 239 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 240 241 return xhci_resume(xhci, 0); 242 } 243 244 static const struct dev_pm_ops xhci_plat_pm_ops = { 245 SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume) 246 }; 247 #define DEV_PM_OPS (&xhci_plat_pm_ops) 248 #else 249 #define DEV_PM_OPS NULL 250 #endif /* CONFIG_PM */ 251 252 #ifdef CONFIG_OF 253 static const struct of_device_id usb_xhci_of_match[] = { 254 { .compatible = "generic-xhci" }, 255 { .compatible = "xhci-platform" }, 256 { .compatible = "marvell,armada-375-xhci"}, 257 { .compatible = "marvell,armada-380-xhci"}, 258 { .compatible = "renesas,xhci-r8a7790"}, 259 { .compatible = "renesas,xhci-r8a7791"}, 260 { }, 261 }; 262 MODULE_DEVICE_TABLE(of, usb_xhci_of_match); 263 #endif 264 265 static struct platform_driver usb_xhci_driver = { 266 .probe = xhci_plat_probe, 267 .remove = xhci_plat_remove, 268 .driver = { 269 .name = "xhci-hcd", 270 .pm = DEV_PM_OPS, 271 .of_match_table = of_match_ptr(usb_xhci_of_match), 272 }, 273 }; 274 MODULE_ALIAS("platform:xhci-hcd"); 275 276 static int __init xhci_plat_init(void) 277 { 278 xhci_init_driver(&xhci_plat_hc_driver, &xhci_plat_overrides); 279 return platform_driver_register(&usb_xhci_driver); 280 } 281 module_init(xhci_plat_init); 282 283 static void __exit xhci_plat_exit(void) 284 { 285 platform_driver_unregister(&usb_xhci_driver); 286 } 287 module_exit(xhci_plat_exit); 288 289 MODULE_DESCRIPTION("xHCI Platform Host Controller Driver"); 290 MODULE_LICENSE("GPL"); 291