1 /* 2 * Generic platform ehci driver 3 * 4 * Copyright 2007 Steven Brown <sbrown@cortland.com> 5 * Copyright 2010-2012 Hauke Mehrtens <hauke@hauke-m.de> 6 * Copyright 2014 Hans de Goede <hdegoede@redhat.com> 7 * 8 * Derived from the ohci-ssb driver 9 * Copyright 2007 Michael Buesch <m@bues.ch> 10 * 11 * Derived from the EHCI-PCI driver 12 * Copyright (c) 2000-2004 by David Brownell 13 * 14 * Derived from the ohci-pci driver 15 * Copyright 1999 Roman Weissgaerber 16 * Copyright 2000-2002 David Brownell 17 * Copyright 1999 Linus Torvalds 18 * Copyright 1999 Gregory P. Smith 19 * 20 * Licensed under the GNU/GPL. See COPYING for details. 21 */ 22 #include <linux/clk.h> 23 #include <linux/dma-mapping.h> 24 #include <linux/err.h> 25 #include <linux/kernel.h> 26 #include <linux/hrtimer.h> 27 #include <linux/io.h> 28 #include <linux/module.h> 29 #include <linux/of.h> 30 #include <linux/phy/phy.h> 31 #include <linux/platform_device.h> 32 #include <linux/reset.h> 33 #include <linux/usb.h> 34 #include <linux/usb/hcd.h> 35 #include <linux/usb/ehci_pdriver.h> 36 37 #include "ehci.h" 38 39 #define DRIVER_DESC "EHCI generic platform driver" 40 #define EHCI_MAX_CLKS 3 41 #define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv) 42 43 struct ehci_platform_priv { 44 struct clk *clks[EHCI_MAX_CLKS]; 45 struct reset_control *rst; 46 struct phy **phys; 47 int num_phys; 48 }; 49 50 static const char hcd_name[] = "ehci-platform"; 51 52 static int ehci_platform_reset(struct usb_hcd *hcd) 53 { 54 struct platform_device *pdev = to_platform_device(hcd->self.controller); 55 struct usb_ehci_pdata *pdata = dev_get_platdata(&pdev->dev); 56 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 57 int retval; 58 59 hcd->has_tt = pdata->has_tt; 60 ehci->has_synopsys_hc_bug = pdata->has_synopsys_hc_bug; 61 62 if (pdata->pre_setup) { 63 retval = pdata->pre_setup(hcd); 64 if (retval < 0) 65 return retval; 66 } 67 68 ehci->caps = hcd->regs + pdata->caps_offset; 69 retval = ehci_setup(hcd); 70 if (retval) 71 return retval; 72 73 if (pdata->no_io_watchdog) 74 ehci->need_io_watchdog = 0; 75 return 0; 76 } 77 78 static int ehci_platform_power_on(struct platform_device *dev) 79 { 80 struct usb_hcd *hcd = platform_get_drvdata(dev); 81 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd); 82 int clk, ret, phy_num; 83 84 for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++) { 85 ret = clk_prepare_enable(priv->clks[clk]); 86 if (ret) 87 goto err_disable_clks; 88 } 89 90 for (phy_num = 0; phy_num < priv->num_phys; phy_num++) { 91 ret = phy_init(priv->phys[phy_num]); 92 if (ret) 93 goto err_exit_phy; 94 ret = phy_power_on(priv->phys[phy_num]); 95 if (ret) { 96 phy_exit(priv->phys[phy_num]); 97 goto err_exit_phy; 98 } 99 } 100 101 return 0; 102 103 err_exit_phy: 104 while (--phy_num >= 0) { 105 phy_power_off(priv->phys[phy_num]); 106 phy_exit(priv->phys[phy_num]); 107 } 108 err_disable_clks: 109 while (--clk >= 0) 110 clk_disable_unprepare(priv->clks[clk]); 111 112 return ret; 113 } 114 115 static void ehci_platform_power_off(struct platform_device *dev) 116 { 117 struct usb_hcd *hcd = platform_get_drvdata(dev); 118 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd); 119 int clk, phy_num; 120 121 for (phy_num = 0; phy_num < priv->num_phys; phy_num++) { 122 phy_power_off(priv->phys[phy_num]); 123 phy_exit(priv->phys[phy_num]); 124 } 125 126 for (clk = EHCI_MAX_CLKS - 1; clk >= 0; clk--) 127 if (priv->clks[clk]) 128 clk_disable_unprepare(priv->clks[clk]); 129 } 130 131 static struct hc_driver __read_mostly ehci_platform_hc_driver; 132 133 static const struct ehci_driver_overrides platform_overrides __initconst = { 134 .reset = ehci_platform_reset, 135 .extra_priv_size = sizeof(struct ehci_platform_priv), 136 }; 137 138 static struct usb_ehci_pdata ehci_platform_defaults = { 139 .power_on = ehci_platform_power_on, 140 .power_suspend = ehci_platform_power_off, 141 .power_off = ehci_platform_power_off, 142 }; 143 144 static int ehci_platform_probe(struct platform_device *dev) 145 { 146 struct usb_hcd *hcd; 147 struct resource *res_mem; 148 struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev); 149 struct ehci_platform_priv *priv; 150 struct ehci_hcd *ehci; 151 int err, irq, phy_num, clk = 0; 152 153 if (usb_disabled()) 154 return -ENODEV; 155 156 /* 157 * Use reasonable defaults so platforms don't have to provide these 158 * with DT probing on ARM. 159 */ 160 if (!pdata) 161 pdata = &ehci_platform_defaults; 162 163 err = dma_coerce_mask_and_coherent(&dev->dev, 164 pdata->dma_mask_64 ? DMA_BIT_MASK(64) : DMA_BIT_MASK(32)); 165 if (err) 166 return err; 167 168 irq = platform_get_irq(dev, 0); 169 if (irq < 0) { 170 dev_err(&dev->dev, "no irq provided"); 171 return irq; 172 } 173 174 hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev, 175 dev_name(&dev->dev)); 176 if (!hcd) 177 return -ENOMEM; 178 179 platform_set_drvdata(dev, hcd); 180 dev->dev.platform_data = pdata; 181 priv = hcd_to_ehci_priv(hcd); 182 ehci = hcd_to_ehci(hcd); 183 184 if (pdata == &ehci_platform_defaults && dev->dev.of_node) { 185 if (of_property_read_bool(dev->dev.of_node, "big-endian-regs")) 186 ehci->big_endian_mmio = 1; 187 188 if (of_property_read_bool(dev->dev.of_node, "big-endian-desc")) 189 ehci->big_endian_desc = 1; 190 191 if (of_property_read_bool(dev->dev.of_node, "big-endian")) 192 ehci->big_endian_mmio = ehci->big_endian_desc = 1; 193 194 if (of_property_read_bool(dev->dev.of_node, 195 "needs-reset-on-resume")) 196 pdata->reset_on_resume = 1; 197 198 if (of_property_read_bool(dev->dev.of_node, 199 "has-transaction-translator")) 200 pdata->has_tt = 1; 201 202 priv->num_phys = of_count_phandle_with_args(dev->dev.of_node, 203 "phys", "#phy-cells"); 204 205 if (priv->num_phys > 0) { 206 priv->phys = devm_kcalloc(&dev->dev, priv->num_phys, 207 sizeof(struct phy *), GFP_KERNEL); 208 if (!priv->phys) 209 return -ENOMEM; 210 } else 211 priv->num_phys = 0; 212 213 for (phy_num = 0; phy_num < priv->num_phys; phy_num++) { 214 priv->phys[phy_num] = devm_of_phy_get_by_index( 215 &dev->dev, dev->dev.of_node, phy_num); 216 if (IS_ERR(priv->phys[phy_num])) { 217 err = PTR_ERR(priv->phys[phy_num]); 218 goto err_put_hcd; 219 } 220 } 221 222 for (clk = 0; clk < EHCI_MAX_CLKS; clk++) { 223 priv->clks[clk] = of_clk_get(dev->dev.of_node, clk); 224 if (IS_ERR(priv->clks[clk])) { 225 err = PTR_ERR(priv->clks[clk]); 226 if (err == -EPROBE_DEFER) 227 goto err_put_clks; 228 priv->clks[clk] = NULL; 229 break; 230 } 231 } 232 } 233 234 priv->rst = devm_reset_control_get_optional(&dev->dev, NULL); 235 if (IS_ERR(priv->rst)) { 236 err = PTR_ERR(priv->rst); 237 if (err == -EPROBE_DEFER) 238 goto err_put_clks; 239 priv->rst = NULL; 240 } else { 241 err = reset_control_deassert(priv->rst); 242 if (err) 243 goto err_put_clks; 244 } 245 246 if (pdata->big_endian_desc) 247 ehci->big_endian_desc = 1; 248 if (pdata->big_endian_mmio) 249 ehci->big_endian_mmio = 1; 250 251 #ifndef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO 252 if (ehci->big_endian_mmio) { 253 dev_err(&dev->dev, 254 "Error: CONFIG_USB_EHCI_BIG_ENDIAN_MMIO not set\n"); 255 err = -EINVAL; 256 goto err_reset; 257 } 258 #endif 259 #ifndef CONFIG_USB_EHCI_BIG_ENDIAN_DESC 260 if (ehci->big_endian_desc) { 261 dev_err(&dev->dev, 262 "Error: CONFIG_USB_EHCI_BIG_ENDIAN_DESC not set\n"); 263 err = -EINVAL; 264 goto err_reset; 265 } 266 #endif 267 268 if (pdata->power_on) { 269 err = pdata->power_on(dev); 270 if (err < 0) 271 goto err_reset; 272 } 273 274 res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0); 275 hcd->regs = devm_ioremap_resource(&dev->dev, res_mem); 276 if (IS_ERR(hcd->regs)) { 277 err = PTR_ERR(hcd->regs); 278 goto err_power; 279 } 280 hcd->rsrc_start = res_mem->start; 281 hcd->rsrc_len = resource_size(res_mem); 282 283 err = usb_add_hcd(hcd, irq, IRQF_SHARED); 284 if (err) 285 goto err_power; 286 287 device_wakeup_enable(hcd->self.controller); 288 platform_set_drvdata(dev, hcd); 289 290 return err; 291 292 err_power: 293 if (pdata->power_off) 294 pdata->power_off(dev); 295 err_reset: 296 if (priv->rst) 297 reset_control_assert(priv->rst); 298 err_put_clks: 299 while (--clk >= 0) 300 clk_put(priv->clks[clk]); 301 err_put_hcd: 302 if (pdata == &ehci_platform_defaults) 303 dev->dev.platform_data = NULL; 304 305 usb_put_hcd(hcd); 306 307 return err; 308 } 309 310 static int ehci_platform_remove(struct platform_device *dev) 311 { 312 struct usb_hcd *hcd = platform_get_drvdata(dev); 313 struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev); 314 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd); 315 int clk; 316 317 usb_remove_hcd(hcd); 318 319 if (pdata->power_off) 320 pdata->power_off(dev); 321 322 if (priv->rst) 323 reset_control_assert(priv->rst); 324 325 for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++) 326 clk_put(priv->clks[clk]); 327 328 usb_put_hcd(hcd); 329 330 if (pdata == &ehci_platform_defaults) 331 dev->dev.platform_data = NULL; 332 333 return 0; 334 } 335 336 #ifdef CONFIG_PM_SLEEP 337 static int ehci_platform_suspend(struct device *dev) 338 { 339 struct usb_hcd *hcd = dev_get_drvdata(dev); 340 struct usb_ehci_pdata *pdata = dev_get_platdata(dev); 341 struct platform_device *pdev = 342 container_of(dev, struct platform_device, dev); 343 bool do_wakeup = device_may_wakeup(dev); 344 int ret; 345 346 ret = ehci_suspend(hcd, do_wakeup); 347 if (ret) 348 return ret; 349 350 if (pdata->power_suspend) 351 pdata->power_suspend(pdev); 352 353 return ret; 354 } 355 356 static int ehci_platform_resume(struct device *dev) 357 { 358 struct usb_hcd *hcd = dev_get_drvdata(dev); 359 struct usb_ehci_pdata *pdata = dev_get_platdata(dev); 360 struct platform_device *pdev = 361 container_of(dev, struct platform_device, dev); 362 363 if (pdata->power_on) { 364 int err = pdata->power_on(pdev); 365 if (err < 0) 366 return err; 367 } 368 369 ehci_resume(hcd, pdata->reset_on_resume); 370 return 0; 371 } 372 #endif /* CONFIG_PM_SLEEP */ 373 374 static const struct of_device_id vt8500_ehci_ids[] = { 375 { .compatible = "via,vt8500-ehci", }, 376 { .compatible = "wm,prizm-ehci", }, 377 { .compatible = "generic-ehci", }, 378 { .compatible = "cavium,octeon-6335-ehci", }, 379 {} 380 }; 381 MODULE_DEVICE_TABLE(of, vt8500_ehci_ids); 382 383 static const struct platform_device_id ehci_platform_table[] = { 384 { "ehci-platform", 0 }, 385 { } 386 }; 387 MODULE_DEVICE_TABLE(platform, ehci_platform_table); 388 389 static SIMPLE_DEV_PM_OPS(ehci_platform_pm_ops, ehci_platform_suspend, 390 ehci_platform_resume); 391 392 static struct platform_driver ehci_platform_driver = { 393 .id_table = ehci_platform_table, 394 .probe = ehci_platform_probe, 395 .remove = ehci_platform_remove, 396 .shutdown = usb_hcd_platform_shutdown, 397 .driver = { 398 .name = "ehci-platform", 399 .pm = &ehci_platform_pm_ops, 400 .of_match_table = vt8500_ehci_ids, 401 } 402 }; 403 404 static int __init ehci_platform_init(void) 405 { 406 if (usb_disabled()) 407 return -ENODEV; 408 409 pr_info("%s: " DRIVER_DESC "\n", hcd_name); 410 411 ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides); 412 return platform_driver_register(&ehci_platform_driver); 413 } 414 module_init(ehci_platform_init); 415 416 static void __exit ehci_platform_cleanup(void) 417 { 418 platform_driver_unregister(&ehci_platform_driver); 419 } 420 module_exit(ehci_platform_cleanup); 421 422 MODULE_DESCRIPTION(DRIVER_DESC); 423 MODULE_AUTHOR("Hauke Mehrtens"); 424 MODULE_AUTHOR("Alan Stern"); 425 MODULE_LICENSE("GPL"); 426