1 /* 2 * Copyright (C) 2010 ST-Ericsson AB 3 * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com> 4 * 5 * Based on omap2430.c 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 */ 21 22 #include <linux/module.h> 23 #include <linux/kernel.h> 24 #include <linux/init.h> 25 #include <linux/clk.h> 26 #include <linux/err.h> 27 #include <linux/io.h> 28 #include <linux/of.h> 29 #include <linux/platform_device.h> 30 #include <linux/usb/musb-ux500.h> 31 32 #include "musb_core.h" 33 34 static struct musb_hdrc_config ux500_musb_hdrc_config = { 35 .multipoint = true, 36 .dyn_fifo = true, 37 .num_eps = 16, 38 .ram_bits = 16, 39 }; 40 41 struct ux500_glue { 42 struct device *dev; 43 struct platform_device *musb; 44 struct clk *clk; 45 }; 46 #define glue_to_musb(g) platform_get_drvdata(g->musb) 47 48 static void ux500_musb_set_vbus(struct musb *musb, int is_on) 49 { 50 u8 devctl; 51 unsigned long timeout = jiffies + msecs_to_jiffies(1000); 52 /* HDRC controls CPEN, but beware current surges during device 53 * connect. They can trigger transient overcurrent conditions 54 * that must be ignored. 55 */ 56 57 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 58 59 if (is_on) { 60 if (musb->xceiv->state == OTG_STATE_A_IDLE) { 61 /* start the session */ 62 devctl |= MUSB_DEVCTL_SESSION; 63 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); 64 /* 65 * Wait for the musb to set as A device to enable the 66 * VBUS 67 */ 68 while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) { 69 70 if (time_after(jiffies, timeout)) { 71 dev_err(musb->controller, 72 "configured as A device timeout"); 73 break; 74 } 75 } 76 77 } else { 78 musb->is_active = 1; 79 musb->xceiv->otg->default_a = 1; 80 musb->xceiv->state = OTG_STATE_A_WAIT_VRISE; 81 devctl |= MUSB_DEVCTL_SESSION; 82 MUSB_HST_MODE(musb); 83 } 84 } else { 85 musb->is_active = 0; 86 87 /* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and jumping 88 * right to B_IDLE... 89 */ 90 musb->xceiv->otg->default_a = 0; 91 devctl &= ~MUSB_DEVCTL_SESSION; 92 MUSB_DEV_MODE(musb); 93 } 94 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); 95 96 /* 97 * Devctl values will be updated after vbus goes below 98 * session_valid. The time taken depends on the capacitance 99 * on VBUS line. The max discharge time can be upto 1 sec 100 * as per the spec. Typically on our platform, it is 200ms 101 */ 102 if (!is_on) 103 mdelay(200); 104 105 dev_dbg(musb->controller, "VBUS %s, devctl %02x\n", 106 usb_otg_state_string(musb->xceiv->state), 107 musb_readb(musb->mregs, MUSB_DEVCTL)); 108 } 109 110 static int musb_otg_notifications(struct notifier_block *nb, 111 unsigned long event, void *unused) 112 { 113 struct musb *musb = container_of(nb, struct musb, nb); 114 115 dev_dbg(musb->controller, "musb_otg_notifications %ld %s\n", 116 event, usb_otg_state_string(musb->xceiv->state)); 117 118 switch (event) { 119 case UX500_MUSB_ID: 120 dev_dbg(musb->controller, "ID GND\n"); 121 ux500_musb_set_vbus(musb, 1); 122 break; 123 case UX500_MUSB_VBUS: 124 dev_dbg(musb->controller, "VBUS Connect\n"); 125 break; 126 case UX500_MUSB_NONE: 127 dev_dbg(musb->controller, "VBUS Disconnect\n"); 128 if (is_host_active(musb)) 129 ux500_musb_set_vbus(musb, 0); 130 else 131 musb->xceiv->state = OTG_STATE_B_IDLE; 132 break; 133 default: 134 dev_dbg(musb->controller, "ID float\n"); 135 return NOTIFY_DONE; 136 } 137 return NOTIFY_OK; 138 } 139 140 static irqreturn_t ux500_musb_interrupt(int irq, void *__hci) 141 { 142 unsigned long flags; 143 irqreturn_t retval = IRQ_NONE; 144 struct musb *musb = __hci; 145 146 spin_lock_irqsave(&musb->lock, flags); 147 148 musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB); 149 musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX); 150 musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX); 151 152 if (musb->int_usb || musb->int_tx || musb->int_rx) 153 retval = musb_interrupt(musb); 154 155 spin_unlock_irqrestore(&musb->lock, flags); 156 157 return retval; 158 } 159 160 static int ux500_musb_init(struct musb *musb) 161 { 162 int status; 163 164 musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2); 165 if (IS_ERR_OR_NULL(musb->xceiv)) { 166 pr_err("HS USB OTG: no transceiver configured\n"); 167 return -EPROBE_DEFER; 168 } 169 170 musb->nb.notifier_call = musb_otg_notifications; 171 status = usb_register_notifier(musb->xceiv, &musb->nb); 172 if (status < 0) { 173 dev_dbg(musb->controller, "notification register failed\n"); 174 return status; 175 } 176 177 musb->isr = ux500_musb_interrupt; 178 179 return 0; 180 } 181 182 static int ux500_musb_exit(struct musb *musb) 183 { 184 usb_unregister_notifier(musb->xceiv, &musb->nb); 185 186 usb_put_phy(musb->xceiv); 187 188 return 0; 189 } 190 191 static const struct musb_platform_ops ux500_ops = { 192 .init = ux500_musb_init, 193 .exit = ux500_musb_exit, 194 195 .set_vbus = ux500_musb_set_vbus, 196 }; 197 198 static struct musb_hdrc_platform_data * 199 ux500_of_probe(struct platform_device *pdev, struct device_node *np) 200 { 201 struct musb_hdrc_platform_data *pdata; 202 const char *mode; 203 int strlen; 204 205 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); 206 if (!pdata) 207 return NULL; 208 209 mode = of_get_property(np, "dr_mode", &strlen); 210 if (!mode) { 211 dev_err(&pdev->dev, "No 'dr_mode' property found\n"); 212 return NULL; 213 } 214 215 if (strlen > 0) { 216 if (!strcmp(mode, "host")) 217 pdata->mode = MUSB_HOST; 218 if (!strcmp(mode, "otg")) 219 pdata->mode = MUSB_OTG; 220 if (!strcmp(mode, "peripheral")) 221 pdata->mode = MUSB_PERIPHERAL; 222 } 223 224 return pdata; 225 } 226 227 static int ux500_probe(struct platform_device *pdev) 228 { 229 struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data; 230 struct device_node *np = pdev->dev.of_node; 231 struct platform_device *musb; 232 struct ux500_glue *glue; 233 struct clk *clk; 234 int ret = -ENOMEM; 235 236 if (!pdata) { 237 if (np) { 238 pdata = ux500_of_probe(pdev, np); 239 if (!pdata) 240 goto err0; 241 242 pdev->dev.platform_data = pdata; 243 } else { 244 dev_err(&pdev->dev, "no pdata or device tree found\n"); 245 goto err0; 246 } 247 } 248 249 glue = kzalloc(sizeof(*glue), GFP_KERNEL); 250 if (!glue) { 251 dev_err(&pdev->dev, "failed to allocate glue context\n"); 252 goto err0; 253 } 254 255 musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO); 256 if (!musb) { 257 dev_err(&pdev->dev, "failed to allocate musb device\n"); 258 goto err1; 259 } 260 261 clk = clk_get(&pdev->dev, "usb"); 262 if (IS_ERR(clk)) { 263 dev_err(&pdev->dev, "failed to get clock\n"); 264 ret = PTR_ERR(clk); 265 goto err3; 266 } 267 268 ret = clk_prepare_enable(clk); 269 if (ret) { 270 dev_err(&pdev->dev, "failed to enable clock\n"); 271 goto err4; 272 } 273 274 musb->dev.parent = &pdev->dev; 275 musb->dev.dma_mask = &pdev->dev.coherent_dma_mask; 276 musb->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask; 277 musb->dev.of_node = pdev->dev.of_node; 278 279 glue->dev = &pdev->dev; 280 glue->musb = musb; 281 glue->clk = clk; 282 283 pdata->platform_ops = &ux500_ops; 284 pdata->config = &ux500_musb_hdrc_config; 285 286 platform_set_drvdata(pdev, glue); 287 288 ret = platform_device_add_resources(musb, pdev->resource, 289 pdev->num_resources); 290 if (ret) { 291 dev_err(&pdev->dev, "failed to add resources\n"); 292 goto err5; 293 } 294 295 ret = platform_device_add_data(musb, pdata, sizeof(*pdata)); 296 if (ret) { 297 dev_err(&pdev->dev, "failed to add platform_data\n"); 298 goto err5; 299 } 300 301 ret = platform_device_add(musb); 302 if (ret) { 303 dev_err(&pdev->dev, "failed to register musb device\n"); 304 goto err5; 305 } 306 307 return 0; 308 309 err5: 310 clk_disable_unprepare(clk); 311 312 err4: 313 clk_put(clk); 314 315 err3: 316 platform_device_put(musb); 317 318 err1: 319 kfree(glue); 320 321 err0: 322 return ret; 323 } 324 325 static int ux500_remove(struct platform_device *pdev) 326 { 327 struct ux500_glue *glue = platform_get_drvdata(pdev); 328 329 platform_device_unregister(glue->musb); 330 clk_disable_unprepare(glue->clk); 331 clk_put(glue->clk); 332 kfree(glue); 333 334 return 0; 335 } 336 337 #ifdef CONFIG_PM 338 static int ux500_suspend(struct device *dev) 339 { 340 struct ux500_glue *glue = dev_get_drvdata(dev); 341 struct musb *musb = glue_to_musb(glue); 342 343 usb_phy_set_suspend(musb->xceiv, 1); 344 clk_disable_unprepare(glue->clk); 345 346 return 0; 347 } 348 349 static int ux500_resume(struct device *dev) 350 { 351 struct ux500_glue *glue = dev_get_drvdata(dev); 352 struct musb *musb = glue_to_musb(glue); 353 int ret; 354 355 ret = clk_prepare_enable(glue->clk); 356 if (ret) { 357 dev_err(dev, "failed to enable clock\n"); 358 return ret; 359 } 360 361 usb_phy_set_suspend(musb->xceiv, 0); 362 363 return 0; 364 } 365 366 static const struct dev_pm_ops ux500_pm_ops = { 367 .suspend = ux500_suspend, 368 .resume = ux500_resume, 369 }; 370 371 #define DEV_PM_OPS (&ux500_pm_ops) 372 #else 373 #define DEV_PM_OPS NULL 374 #endif 375 376 static const struct of_device_id ux500_match[] = { 377 { .compatible = "stericsson,db8500-musb", }, 378 {} 379 }; 380 381 static struct platform_driver ux500_driver = { 382 .probe = ux500_probe, 383 .remove = ux500_remove, 384 .driver = { 385 .name = "musb-ux500", 386 .pm = DEV_PM_OPS, 387 .of_match_table = ux500_match, 388 }, 389 }; 390 391 MODULE_DESCRIPTION("UX500 MUSB Glue Layer"); 392 MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>"); 393 MODULE_LICENSE("GPL v2"); 394 module_platform_driver(ux500_driver); 395