1 // SPDX-License-Identifier: GPL-1.0+ 2 /* 3 * OHCI HCD (Host Controller Driver) for USB. 4 * 5 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> 6 * (C) Copyright 2000-2005 David Brownell 7 * (C) Copyright 2002 Hewlett-Packard Company 8 * 9 * OMAP Bus Glue 10 * 11 * Modified for OMAP by Tony Lindgren <tony@atomide.com> 12 * Based on the 2.4 OMAP OHCI driver originally done by MontaVista Software Inc. 13 * and on ohci-sa1111.c by Christopher Hoover <ch@hpl.hp.com> 14 * 15 * This file is licenced under the GPL. 16 */ 17 18 #include <linux/clk.h> 19 #include <linux/dma-mapping.h> 20 #include <linux/err.h> 21 #include <linux/gpio/consumer.h> 22 #include <linux/io.h> 23 #include <linux/jiffies.h> 24 #include <linux/kernel.h> 25 #include <linux/module.h> 26 #include <linux/usb/otg.h> 27 #include <linux/platform_device.h> 28 #include <linux/platform_data/usb-omap1.h> 29 #include <linux/soc/ti/omap1-usb.h> 30 #include <linux/soc/ti/omap1-mux.h> 31 #include <linux/soc/ti/omap1-soc.h> 32 #include <linux/soc/ti/omap1-io.h> 33 #include <linux/signal.h> 34 #include <linux/usb.h> 35 #include <linux/usb/hcd.h> 36 37 #include "ohci.h" 38 39 #include <asm/io.h> 40 #include <asm/mach-types.h> 41 42 #define DRIVER_DESC "OHCI OMAP driver" 43 44 struct ohci_omap_priv { 45 struct clk *usb_host_ck; 46 struct clk *usb_dc_ck; 47 struct gpio_desc *power; 48 struct gpio_desc *overcurrent; 49 }; 50 51 static const char hcd_name[] = "ohci-omap"; 52 static struct hc_driver __read_mostly ohci_omap_hc_driver; 53 54 #define hcd_to_ohci_omap_priv(h) \ 55 ((struct ohci_omap_priv *)hcd_to_ohci(h)->priv) 56 57 static void omap_ohci_clock_power(struct ohci_omap_priv *priv, int on) 58 { 59 if (on) { 60 clk_enable(priv->usb_dc_ck); 61 clk_enable(priv->usb_host_ck); 62 /* guesstimate for T5 == 1x 32K clock + APLL lock time */ 63 udelay(100); 64 } else { 65 clk_disable(priv->usb_host_ck); 66 clk_disable(priv->usb_dc_ck); 67 } 68 } 69 70 static void start_hnp(struct ohci_hcd *ohci) 71 { 72 struct usb_hcd *hcd = ohci_to_hcd(ohci); 73 const unsigned port = hcd->self.otg_port - 1; 74 unsigned long flags; 75 u32 l; 76 77 otg_start_hnp(hcd->usb_phy->otg); 78 79 local_irq_save(flags); 80 hcd->usb_phy->otg->state = OTG_STATE_A_SUSPEND; 81 writel (RH_PS_PSS, &ohci->regs->roothub.portstatus [port]); 82 l = omap_readl(OTG_CTRL); 83 l &= ~OTG_A_BUSREQ; 84 omap_writel(l, OTG_CTRL); 85 local_irq_restore(flags); 86 } 87 88 /*-------------------------------------------------------------------------*/ 89 90 static int ohci_omap_reset(struct usb_hcd *hcd) 91 { 92 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 93 struct omap_usb_config *config = dev_get_platdata(hcd->self.controller); 94 struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd); 95 int need_transceiver = (config->otg != 0); 96 int ret; 97 98 dev_dbg(hcd->self.controller, "starting USB Controller\n"); 99 100 if (config->otg) { 101 hcd->self.otg_port = config->otg; 102 /* default/minimum OTG power budget: 8 mA */ 103 hcd->power_budget = 8; 104 } 105 106 /* XXX OMAP16xx only */ 107 if (config->ocpi_enable) 108 config->ocpi_enable(); 109 110 if (IS_ENABLED(CONFIG_USB_OTG) && need_transceiver) { 111 hcd->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2); 112 if (!IS_ERR_OR_NULL(hcd->usb_phy)) { 113 int status = otg_set_host(hcd->usb_phy->otg, 114 &ohci_to_hcd(ohci)->self); 115 dev_dbg(hcd->self.controller, "init %s phy, status %d\n", 116 hcd->usb_phy->label, status); 117 if (status) { 118 usb_put_phy(hcd->usb_phy); 119 return status; 120 } 121 } else { 122 return -EPROBE_DEFER; 123 } 124 hcd->skip_phy_initialization = 1; 125 ohci->start_hnp = start_hnp; 126 } 127 128 omap_ohci_clock_power(priv, 1); 129 130 if (config->lb_reset) 131 config->lb_reset(); 132 133 ret = ohci_setup(hcd); 134 if (ret < 0) 135 return ret; 136 137 if (config->otg || config->rwc) { 138 ohci->hc_control = OHCI_CTRL_RWC; 139 writel(OHCI_CTRL_RWC, &ohci->regs->control); 140 } 141 142 /* board-specific power switching and overcurrent support */ 143 if (machine_is_omap_osk()) { 144 u32 rh = roothub_a (ohci); 145 146 /* power switching (ganged by default) */ 147 rh &= ~RH_A_NPS; 148 149 /* TPS2045 switch for internal transceiver (port 1) */ 150 if (machine_is_omap_osk()) { 151 ohci_to_hcd(ohci)->power_budget = 250; 152 153 rh &= ~RH_A_NOCP; 154 155 /* gpio9 for overcurrent detction */ 156 omap_cfg_reg(W8_1610_GPIO9); 157 158 /* for paranoia's sake: disable USB.PUEN */ 159 omap_cfg_reg(W4_USB_HIGHZ); 160 } 161 ohci_writel(ohci, rh, &ohci->regs->roothub.a); 162 ohci->flags &= ~OHCI_QUIRK_HUB_POWER; 163 } else if (machine_is_nokia770()) { 164 /* We require a self-powered hub, which should have 165 * plenty of power. */ 166 ohci_to_hcd(ohci)->power_budget = 0; 167 } 168 169 /* FIXME hub_wq hub requests should manage power switching */ 170 if (config->transceiver_power) 171 return config->transceiver_power(1); 172 173 if (priv->power) 174 gpiod_set_value_cansleep(priv->power, 0); 175 176 /* board init will have already handled HMC and mux setup. 177 * any external transceiver should already be initialized 178 * too, so all configured ports use the right signaling now. 179 */ 180 181 return 0; 182 } 183 184 /*-------------------------------------------------------------------------*/ 185 186 /** 187 * ohci_hcd_omap_probe - initialize OMAP-based HCDs 188 * @pdev: USB controller to probe 189 * 190 * Context: task context, might sleep 191 * 192 * Allocates basic resources for this USB host controller, and 193 * then invokes the start() method for the HCD associated with it 194 * through the hotplug entry's driver_data. 195 */ 196 static int ohci_hcd_omap_probe(struct platform_device *pdev) 197 { 198 int retval, irq; 199 struct usb_hcd *hcd = 0; 200 struct ohci_omap_priv *priv; 201 202 if (pdev->num_resources != 2) { 203 dev_err(&pdev->dev, "invalid num_resources: %i\n", 204 pdev->num_resources); 205 return -ENODEV; 206 } 207 208 if (pdev->resource[0].flags != IORESOURCE_MEM 209 || pdev->resource[1].flags != IORESOURCE_IRQ) { 210 dev_err(&pdev->dev, "invalid resource type\n"); 211 return -ENODEV; 212 } 213 214 hcd = usb_create_hcd(&ohci_omap_hc_driver, &pdev->dev, 215 dev_name(&pdev->dev)); 216 if (!hcd) 217 return -ENOMEM; 218 219 hcd->rsrc_start = pdev->resource[0].start; 220 hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1; 221 priv = hcd_to_ohci_omap_priv(hcd); 222 223 /* Obtain two optional GPIO lines */ 224 priv->power = devm_gpiod_get_optional(&pdev->dev, "power", GPIOD_ASIS); 225 if (IS_ERR(priv->power)) { 226 retval = PTR_ERR(priv->power); 227 goto err_put_hcd; 228 } 229 if (priv->power) 230 gpiod_set_consumer_name(priv->power, "OHCI power"); 231 232 /* 233 * This "overcurrent" GPIO line isn't really used in the code, 234 * but has a designated hardware function. 235 * TODO: implement proper overcurrent handling. 236 */ 237 priv->overcurrent = devm_gpiod_get_optional(&pdev->dev, "overcurrent", 238 GPIOD_IN); 239 if (IS_ERR(priv->overcurrent)) { 240 retval = PTR_ERR(priv->overcurrent); 241 goto err_put_hcd; 242 } 243 if (priv->overcurrent) 244 gpiod_set_consumer_name(priv->overcurrent, "OHCI overcurrent"); 245 246 priv->usb_host_ck = clk_get(&pdev->dev, "usb_hhc_ck"); 247 if (IS_ERR(priv->usb_host_ck)) { 248 retval = PTR_ERR(priv->usb_host_ck); 249 goto err_put_hcd; 250 } 251 252 retval = clk_prepare(priv->usb_host_ck); 253 if (retval) 254 goto err_put_host_ck; 255 256 if (!cpu_is_omap15xx()) 257 priv->usb_dc_ck = clk_get(&pdev->dev, "usb_dc_ck"); 258 else 259 priv->usb_dc_ck = clk_get(&pdev->dev, "lb_ck"); 260 261 if (IS_ERR(priv->usb_dc_ck)) { 262 retval = PTR_ERR(priv->usb_dc_ck); 263 goto err_unprepare_host_ck; 264 } 265 266 retval = clk_prepare(priv->usb_dc_ck); 267 if (retval) 268 goto err_put_dc_ck; 269 270 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { 271 dev_dbg(&pdev->dev, "request_mem_region failed\n"); 272 retval = -EBUSY; 273 goto err_unprepare_dc_ck; 274 } 275 276 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); 277 if (!hcd->regs) { 278 dev_err(&pdev->dev, "can't ioremap OHCI HCD\n"); 279 retval = -ENOMEM; 280 goto err2; 281 } 282 283 irq = platform_get_irq(pdev, 0); 284 if (irq < 0) { 285 retval = irq; 286 goto err3; 287 } 288 retval = usb_add_hcd(hcd, irq, 0); 289 if (retval) 290 goto err3; 291 292 device_wakeup_enable(hcd->self.controller); 293 return 0; 294 err3: 295 iounmap(hcd->regs); 296 err2: 297 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 298 err_unprepare_dc_ck: 299 clk_unprepare(priv->usb_dc_ck); 300 err_put_dc_ck: 301 clk_put(priv->usb_dc_ck); 302 err_unprepare_host_ck: 303 clk_unprepare(priv->usb_host_ck); 304 err_put_host_ck: 305 clk_put(priv->usb_host_ck); 306 err_put_hcd: 307 usb_put_hcd(hcd); 308 return retval; 309 } 310 311 312 /* may be called with controller, bus, and devices active */ 313 314 /** 315 * ohci_hcd_omap_remove - shutdown processing for OMAP-based HCDs 316 * @pdev: USB Host Controller being removed 317 * 318 * Context: task context, might sleep 319 * 320 * Reverses the effect of ohci_hcd_omap_probe(), first invoking 321 * the HCD's stop() method. It is always called from a thread 322 * context, normally "rmmod", "apmd", or something similar. 323 */ 324 static int ohci_hcd_omap_remove(struct platform_device *pdev) 325 { 326 struct usb_hcd *hcd = platform_get_drvdata(pdev); 327 struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd); 328 329 dev_dbg(hcd->self.controller, "stopping USB Controller\n"); 330 usb_remove_hcd(hcd); 331 omap_ohci_clock_power(priv, 0); 332 if (!IS_ERR_OR_NULL(hcd->usb_phy)) { 333 (void) otg_set_host(hcd->usb_phy->otg, 0); 334 usb_put_phy(hcd->usb_phy); 335 } 336 iounmap(hcd->regs); 337 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 338 clk_unprepare(priv->usb_dc_ck); 339 clk_put(priv->usb_dc_ck); 340 clk_unprepare(priv->usb_host_ck); 341 clk_put(priv->usb_host_ck); 342 usb_put_hcd(hcd); 343 return 0; 344 } 345 346 /*-------------------------------------------------------------------------*/ 347 348 #ifdef CONFIG_PM 349 350 static int ohci_omap_suspend(struct platform_device *pdev, pm_message_t message) 351 { 352 struct usb_hcd *hcd = platform_get_drvdata(pdev); 353 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 354 struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd); 355 bool do_wakeup = device_may_wakeup(&pdev->dev); 356 int ret; 357 358 if (time_before(jiffies, ohci->next_statechange)) 359 msleep(5); 360 ohci->next_statechange = jiffies; 361 362 ret = ohci_suspend(hcd, do_wakeup); 363 if (ret) 364 return ret; 365 366 omap_ohci_clock_power(priv, 0); 367 return ret; 368 } 369 370 static int ohci_omap_resume(struct platform_device *dev) 371 { 372 struct usb_hcd *hcd = platform_get_drvdata(dev); 373 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 374 struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd); 375 376 if (time_before(jiffies, ohci->next_statechange)) 377 msleep(5); 378 ohci->next_statechange = jiffies; 379 380 omap_ohci_clock_power(priv, 1); 381 ohci_resume(hcd, false); 382 return 0; 383 } 384 385 #endif 386 387 /*-------------------------------------------------------------------------*/ 388 389 /* 390 * Driver definition to register with the OMAP bus 391 */ 392 static struct platform_driver ohci_hcd_omap_driver = { 393 .probe = ohci_hcd_omap_probe, 394 .remove = ohci_hcd_omap_remove, 395 .shutdown = usb_hcd_platform_shutdown, 396 #ifdef CONFIG_PM 397 .suspend = ohci_omap_suspend, 398 .resume = ohci_omap_resume, 399 #endif 400 .driver = { 401 .name = "ohci", 402 }, 403 }; 404 405 static const struct ohci_driver_overrides omap_overrides __initconst = { 406 .product_desc = "OMAP OHCI", 407 .reset = ohci_omap_reset, 408 .extra_priv_size = sizeof(struct ohci_omap_priv), 409 }; 410 411 static int __init ohci_omap_init(void) 412 { 413 if (usb_disabled()) 414 return -ENODEV; 415 416 ohci_init_driver(&ohci_omap_hc_driver, &omap_overrides); 417 return platform_driver_register(&ohci_hcd_omap_driver); 418 } 419 module_init(ohci_omap_init); 420 421 static void __exit ohci_omap_cleanup(void) 422 { 423 platform_driver_unregister(&ohci_hcd_omap_driver); 424 } 425 module_exit(ohci_omap_cleanup); 426 427 MODULE_DESCRIPTION(DRIVER_DESC); 428 MODULE_ALIAS("platform:ohci"); 429 MODULE_LICENSE("GPL"); 430