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/clk.h> 25 #include <linux/err.h> 26 #include <linux/io.h> 27 #include <linux/of.h> 28 #include <linux/platform_device.h> 29 #include <linux/usb/musb-ux500.h> 30 31 #include "musb_core.h" 32 33 static const struct musb_hdrc_config ux500_musb_hdrc_config = { 34 .multipoint = true, 35 .dyn_fifo = true, 36 .num_eps = 16, 37 .ram_bits = 16, 38 }; 39 40 struct ux500_glue { 41 struct device *dev; 42 struct platform_device *musb; 43 struct clk *clk; 44 }; 45 #define glue_to_musb(g) platform_get_drvdata(g->musb) 46 47 static void ux500_musb_set_vbus(struct musb *musb, int is_on) 48 { 49 u8 devctl; 50 unsigned long timeout = jiffies + msecs_to_jiffies(1000); 51 /* HDRC controls CPEN, but beware current surges during device 52 * connect. They can trigger transient overcurrent conditions 53 * that must be ignored. 54 */ 55 56 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 57 58 if (is_on) { 59 if (musb->xceiv->otg->state == OTG_STATE_A_IDLE) { 60 /* start the session */ 61 devctl |= MUSB_DEVCTL_SESSION; 62 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); 63 /* 64 * Wait for the musb to set as A device to enable the 65 * VBUS 66 */ 67 while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) { 68 69 if (time_after(jiffies, timeout)) { 70 dev_err(musb->controller, 71 "configured as A device timeout"); 72 break; 73 } 74 } 75 76 } else { 77 musb->is_active = 1; 78 musb->xceiv->otg->default_a = 1; 79 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE; 80 devctl |= MUSB_DEVCTL_SESSION; 81 MUSB_HST_MODE(musb); 82 } 83 } else { 84 musb->is_active = 0; 85 86 /* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and jumping 87 * right to B_IDLE... 88 */ 89 musb->xceiv->otg->default_a = 0; 90 devctl &= ~MUSB_DEVCTL_SESSION; 91 MUSB_DEV_MODE(musb); 92 } 93 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); 94 95 /* 96 * Devctl values will be updated after vbus goes below 97 * session_valid. The time taken depends on the capacitance 98 * on VBUS line. The max discharge time can be upto 1 sec 99 * as per the spec. Typically on our platform, it is 200ms 100 */ 101 if (!is_on) 102 mdelay(200); 103 104 dev_dbg(musb->controller, "VBUS %s, devctl %02x\n", 105 usb_otg_state_string(musb->xceiv->otg->state), 106 musb_readb(musb->mregs, MUSB_DEVCTL)); 107 } 108 109 static int musb_otg_notifications(struct notifier_block *nb, 110 unsigned long event, void *unused) 111 { 112 struct musb *musb = container_of(nb, struct musb, nb); 113 114 dev_dbg(musb->controller, "musb_otg_notifications %ld %s\n", 115 event, usb_otg_state_string(musb->xceiv->otg->state)); 116 117 switch (event) { 118 case UX500_MUSB_ID: 119 dev_dbg(musb->controller, "ID GND\n"); 120 ux500_musb_set_vbus(musb, 1); 121 break; 122 case UX500_MUSB_VBUS: 123 dev_dbg(musb->controller, "VBUS Connect\n"); 124 break; 125 case UX500_MUSB_NONE: 126 dev_dbg(musb->controller, "VBUS Disconnect\n"); 127 if (is_host_active(musb)) 128 ux500_musb_set_vbus(musb, 0); 129 else 130 musb->xceiv->otg->state = OTG_STATE_B_IDLE; 131 break; 132 default: 133 dev_dbg(musb->controller, "ID float\n"); 134 return NOTIFY_DONE; 135 } 136 return NOTIFY_OK; 137 } 138 139 static irqreturn_t ux500_musb_interrupt(int irq, void *__hci) 140 { 141 unsigned long flags; 142 irqreturn_t retval = IRQ_NONE; 143 struct musb *musb = __hci; 144 145 spin_lock_irqsave(&musb->lock, flags); 146 147 musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB); 148 musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX); 149 musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX); 150 151 if (musb->int_usb || musb->int_tx || musb->int_rx) 152 retval = musb_interrupt(musb); 153 154 spin_unlock_irqrestore(&musb->lock, flags); 155 156 return retval; 157 } 158 159 static int ux500_musb_init(struct musb *musb) 160 { 161 int status; 162 163 musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2); 164 if (IS_ERR_OR_NULL(musb->xceiv)) { 165 pr_err("HS USB OTG: no transceiver configured\n"); 166 return -EPROBE_DEFER; 167 } 168 169 musb->nb.notifier_call = musb_otg_notifications; 170 status = usb_register_notifier(musb->xceiv, &musb->nb); 171 if (status < 0) { 172 dev_dbg(musb->controller, "notification register failed\n"); 173 return status; 174 } 175 176 musb->isr = ux500_musb_interrupt; 177 178 return 0; 179 } 180 181 static int ux500_musb_exit(struct musb *musb) 182 { 183 usb_unregister_notifier(musb->xceiv, &musb->nb); 184 185 usb_put_phy(musb->xceiv); 186 187 return 0; 188 } 189 190 static const struct musb_platform_ops ux500_ops = { 191 .quirks = MUSB_DMA_UX500 | MUSB_INDEXED_EP, 192 #ifdef CONFIG_USB_UX500_DMA 193 .dma_init = ux500_dma_controller_create, 194 .dma_exit = ux500_dma_controller_destroy, 195 #endif 196 .init = ux500_musb_init, 197 .exit = ux500_musb_exit, 198 .fifo_mode = 5, 199 200 .set_vbus = ux500_musb_set_vbus, 201 }; 202 203 static struct musb_hdrc_platform_data * 204 ux500_of_probe(struct platform_device *pdev, struct device_node *np) 205 { 206 struct musb_hdrc_platform_data *pdata; 207 const char *mode; 208 int strlen; 209 210 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); 211 if (!pdata) 212 return NULL; 213 214 mode = of_get_property(np, "dr_mode", &strlen); 215 if (!mode) { 216 dev_err(&pdev->dev, "No 'dr_mode' property found\n"); 217 return NULL; 218 } 219 220 if (strlen > 0) { 221 if (!strcmp(mode, "host")) 222 pdata->mode = MUSB_HOST; 223 if (!strcmp(mode, "otg")) 224 pdata->mode = MUSB_OTG; 225 if (!strcmp(mode, "peripheral")) 226 pdata->mode = MUSB_PERIPHERAL; 227 } 228 229 return pdata; 230 } 231 232 static int ux500_probe(struct platform_device *pdev) 233 { 234 struct resource musb_resources[2]; 235 struct musb_hdrc_platform_data *pdata = dev_get_platdata(&pdev->dev); 236 struct device_node *np = pdev->dev.of_node; 237 struct platform_device *musb; 238 struct ux500_glue *glue; 239 struct clk *clk; 240 int ret = -ENOMEM; 241 242 if (!pdata) { 243 if (np) { 244 pdata = ux500_of_probe(pdev, np); 245 if (!pdata) 246 goto err0; 247 248 pdev->dev.platform_data = pdata; 249 } else { 250 dev_err(&pdev->dev, "no pdata or device tree found\n"); 251 goto err0; 252 } 253 } 254 255 glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL); 256 if (!glue) 257 goto err0; 258 259 musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO); 260 if (!musb) { 261 dev_err(&pdev->dev, "failed to allocate musb device\n"); 262 goto err0; 263 } 264 265 clk = devm_clk_get(&pdev->dev, NULL); 266 if (IS_ERR(clk)) { 267 dev_err(&pdev->dev, "failed to get clock\n"); 268 ret = PTR_ERR(clk); 269 goto err1; 270 } 271 272 ret = clk_prepare_enable(clk); 273 if (ret) { 274 dev_err(&pdev->dev, "failed to enable clock\n"); 275 goto err1; 276 } 277 278 musb->dev.parent = &pdev->dev; 279 musb->dev.dma_mask = &pdev->dev.coherent_dma_mask; 280 musb->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask; 281 282 glue->dev = &pdev->dev; 283 glue->musb = musb; 284 glue->clk = clk; 285 286 pdata->platform_ops = &ux500_ops; 287 pdata->config = &ux500_musb_hdrc_config; 288 289 platform_set_drvdata(pdev, glue); 290 291 memset(musb_resources, 0x00, sizeof(*musb_resources) * 292 ARRAY_SIZE(musb_resources)); 293 294 musb_resources[0].name = pdev->resource[0].name; 295 musb_resources[0].start = pdev->resource[0].start; 296 musb_resources[0].end = pdev->resource[0].end; 297 musb_resources[0].flags = pdev->resource[0].flags; 298 299 musb_resources[1].name = pdev->resource[1].name; 300 musb_resources[1].start = pdev->resource[1].start; 301 musb_resources[1].end = pdev->resource[1].end; 302 musb_resources[1].flags = pdev->resource[1].flags; 303 304 ret = platform_device_add_resources(musb, musb_resources, 305 ARRAY_SIZE(musb_resources)); 306 if (ret) { 307 dev_err(&pdev->dev, "failed to add resources\n"); 308 goto err2; 309 } 310 311 ret = platform_device_add_data(musb, pdata, sizeof(*pdata)); 312 if (ret) { 313 dev_err(&pdev->dev, "failed to add platform_data\n"); 314 goto err2; 315 } 316 317 ret = platform_device_add(musb); 318 if (ret) { 319 dev_err(&pdev->dev, "failed to register musb device\n"); 320 goto err2; 321 } 322 323 return 0; 324 325 err2: 326 clk_disable_unprepare(clk); 327 328 err1: 329 platform_device_put(musb); 330 331 err0: 332 return ret; 333 } 334 335 static int ux500_remove(struct platform_device *pdev) 336 { 337 struct ux500_glue *glue = platform_get_drvdata(pdev); 338 339 platform_device_unregister(glue->musb); 340 clk_disable_unprepare(glue->clk); 341 342 return 0; 343 } 344 345 #ifdef CONFIG_PM_SLEEP 346 static int ux500_suspend(struct device *dev) 347 { 348 struct ux500_glue *glue = dev_get_drvdata(dev); 349 struct musb *musb = glue_to_musb(glue); 350 351 if (musb) 352 usb_phy_set_suspend(musb->xceiv, 1); 353 354 clk_disable_unprepare(glue->clk); 355 356 return 0; 357 } 358 359 static int ux500_resume(struct device *dev) 360 { 361 struct ux500_glue *glue = dev_get_drvdata(dev); 362 struct musb *musb = glue_to_musb(glue); 363 int ret; 364 365 ret = clk_prepare_enable(glue->clk); 366 if (ret) { 367 dev_err(dev, "failed to enable clock\n"); 368 return ret; 369 } 370 371 if (musb) 372 usb_phy_set_suspend(musb->xceiv, 0); 373 374 return 0; 375 } 376 #endif 377 378 static SIMPLE_DEV_PM_OPS(ux500_pm_ops, ux500_suspend, ux500_resume); 379 380 static const struct of_device_id ux500_match[] = { 381 { .compatible = "stericsson,db8500-musb", }, 382 {} 383 }; 384 385 MODULE_DEVICE_TABLE(of, ux500_match); 386 387 static struct platform_driver ux500_driver = { 388 .probe = ux500_probe, 389 .remove = ux500_remove, 390 .driver = { 391 .name = "musb-ux500", 392 .pm = &ux500_pm_ops, 393 .of_match_table = ux500_match, 394 }, 395 }; 396 397 MODULE_DESCRIPTION("UX500 MUSB Glue Layer"); 398 MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>"); 399 MODULE_LICENSE("GPL v2"); 400 module_platform_driver(ux500_driver); 401