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 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->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->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->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->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->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 .init = ux500_musb_init, 192 .exit = ux500_musb_exit, 193 194 .set_vbus = ux500_musb_set_vbus, 195 }; 196 197 static struct musb_hdrc_platform_data * 198 ux500_of_probe(struct platform_device *pdev, struct device_node *np) 199 { 200 struct musb_hdrc_platform_data *pdata; 201 const char *mode; 202 int strlen; 203 204 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); 205 if (!pdata) 206 return NULL; 207 208 mode = of_get_property(np, "dr_mode", &strlen); 209 if (!mode) { 210 dev_err(&pdev->dev, "No 'dr_mode' property found\n"); 211 return NULL; 212 } 213 214 if (strlen > 0) { 215 if (!strcmp(mode, "host")) 216 pdata->mode = MUSB_HOST; 217 if (!strcmp(mode, "otg")) 218 pdata->mode = MUSB_OTG; 219 if (!strcmp(mode, "peripheral")) 220 pdata->mode = MUSB_PERIPHERAL; 221 } 222 223 return pdata; 224 } 225 226 static int ux500_probe(struct platform_device *pdev) 227 { 228 struct resource musb_resources[2]; 229 struct musb_hdrc_platform_data *pdata = dev_get_platdata(&pdev->dev); 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 = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL); 250 if (!glue) 251 goto err0; 252 253 musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO); 254 if (!musb) { 255 dev_err(&pdev->dev, "failed to allocate musb device\n"); 256 goto err0; 257 } 258 259 clk = devm_clk_get(&pdev->dev, NULL); 260 if (IS_ERR(clk)) { 261 dev_err(&pdev->dev, "failed to get clock\n"); 262 ret = PTR_ERR(clk); 263 goto err1; 264 } 265 266 ret = clk_prepare_enable(clk); 267 if (ret) { 268 dev_err(&pdev->dev, "failed to enable clock\n"); 269 goto err1; 270 } 271 272 musb->dev.parent = &pdev->dev; 273 musb->dev.dma_mask = &pdev->dev.coherent_dma_mask; 274 musb->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask; 275 276 glue->dev = &pdev->dev; 277 glue->musb = musb; 278 glue->clk = clk; 279 280 pdata->platform_ops = &ux500_ops; 281 pdata->config = &ux500_musb_hdrc_config; 282 283 platform_set_drvdata(pdev, glue); 284 285 memset(musb_resources, 0x00, sizeof(*musb_resources) * 286 ARRAY_SIZE(musb_resources)); 287 288 musb_resources[0].name = pdev->resource[0].name; 289 musb_resources[0].start = pdev->resource[0].start; 290 musb_resources[0].end = pdev->resource[0].end; 291 musb_resources[0].flags = pdev->resource[0].flags; 292 293 musb_resources[1].name = pdev->resource[1].name; 294 musb_resources[1].start = pdev->resource[1].start; 295 musb_resources[1].end = pdev->resource[1].end; 296 musb_resources[1].flags = pdev->resource[1].flags; 297 298 ret = platform_device_add_resources(musb, musb_resources, 299 ARRAY_SIZE(musb_resources)); 300 if (ret) { 301 dev_err(&pdev->dev, "failed to add resources\n"); 302 goto err2; 303 } 304 305 ret = platform_device_add_data(musb, pdata, sizeof(*pdata)); 306 if (ret) { 307 dev_err(&pdev->dev, "failed to add platform_data\n"); 308 goto err2; 309 } 310 311 ret = platform_device_add(musb); 312 if (ret) { 313 dev_err(&pdev->dev, "failed to register musb device\n"); 314 goto err2; 315 } 316 317 return 0; 318 319 err2: 320 clk_disable_unprepare(clk); 321 322 err1: 323 platform_device_put(musb); 324 325 err0: 326 return ret; 327 } 328 329 static int ux500_remove(struct platform_device *pdev) 330 { 331 struct ux500_glue *glue = platform_get_drvdata(pdev); 332 333 platform_device_unregister(glue->musb); 334 clk_disable_unprepare(glue->clk); 335 336 return 0; 337 } 338 339 #ifdef CONFIG_PM 340 static int ux500_suspend(struct device *dev) 341 { 342 struct ux500_glue *glue = dev_get_drvdata(dev); 343 struct musb *musb = glue_to_musb(glue); 344 345 usb_phy_set_suspend(musb->xceiv, 1); 346 clk_disable_unprepare(glue->clk); 347 348 return 0; 349 } 350 351 static int ux500_resume(struct device *dev) 352 { 353 struct ux500_glue *glue = dev_get_drvdata(dev); 354 struct musb *musb = glue_to_musb(glue); 355 int ret; 356 357 ret = clk_prepare_enable(glue->clk); 358 if (ret) { 359 dev_err(dev, "failed to enable clock\n"); 360 return ret; 361 } 362 363 usb_phy_set_suspend(musb->xceiv, 0); 364 365 return 0; 366 } 367 #endif 368 369 static SIMPLE_DEV_PM_OPS(ux500_pm_ops, ux500_suspend, ux500_resume); 370 371 static const struct of_device_id ux500_match[] = { 372 { .compatible = "stericsson,db8500-musb", }, 373 {} 374 }; 375 376 static struct platform_driver ux500_driver = { 377 .probe = ux500_probe, 378 .remove = ux500_remove, 379 .driver = { 380 .name = "musb-ux500", 381 .pm = &ux500_pm_ops, 382 .of_match_table = ux500_match, 383 }, 384 }; 385 386 MODULE_DESCRIPTION("UX500 MUSB Glue Layer"); 387 MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>"); 388 MODULE_LICENSE("GPL v2"); 389 module_platform_driver(ux500_driver); 390