drivers/usb/otg/twl6030-usb.c

   1 /*
   2  * twl6030_usb - TWL6030 USB transceiver, talking to OMAP OTG driver.
   3  *
   4  * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * Author: Hema HK <hemahk@ti.com>
  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
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/io.h>
  28 #include <linux/usb/otg.h>
  29 #include <linux/i2c/twl.h>
  30 #include <linux/regulator/consumer.h>
  31 #include <linux/err.h>
  32 #include <linux/notifier.h>
  33 #include <linux/slab.h>
  34 #include <linux/delay.h>
  35
  36 /* usb register definitions */
  37 #define USB_VENDOR_ID_LSB               0x00
  38 #define USB_VENDOR_ID_MSB               0x01
  39 #define USB_PRODUCT_ID_LSB              0x02
  40 #define USB_PRODUCT_ID_MSB              0x03
  41 #define USB_VBUS_CTRL_SET               0x04
  42 #define USB_VBUS_CTRL_CLR               0x05
  43 #define USB_ID_CTRL_SET                 0x06
  44 #define USB_ID_CTRL_CLR                 0x07
  45 #define USB_VBUS_INT_SRC                0x08
  46 #define USB_VBUS_INT_LATCH_SET          0x09
  47 #define USB_VBUS_INT_LATCH_CLR          0x0A
  48 #define USB_VBUS_INT_EN_LO_SET          0x0B
  49 #define USB_VBUS_INT_EN_LO_CLR          0x0C
  50 #define USB_VBUS_INT_EN_HI_SET          0x0D
  51 #define USB_VBUS_INT_EN_HI_CLR          0x0E
  52 #define USB_ID_INT_SRC                  0x0F
  53 #define USB_ID_INT_LATCH_SET            0x10
  54 #define USB_ID_INT_LATCH_CLR            0x11
  55
  56 #define USB_ID_INT_EN_LO_SET            0x12
  57 #define USB_ID_INT_EN_LO_CLR            0x13
  58 #define USB_ID_INT_EN_HI_SET            0x14
  59 #define USB_ID_INT_EN_HI_CLR            0x15
  60 #define USB_OTG_ADP_CTRL                0x16
  61 #define USB_OTG_ADP_HIGH                0x17
  62 #define USB_OTG_ADP_LOW                 0x18
  63 #define USB_OTG_ADP_RISE                0x19
  64 #define USB_OTG_REVISION                0x1A
  65
  66 /* to be moved to LDO */
  67 #define TWL6030_MISC2                   0xE5
  68 #define TWL6030_CFG_LDO_PD2             0xF5
  69 #define TWL6030_BACKUP_REG              0xFA
  70
  71 #define STS_HW_CONDITIONS               0x21
  72
  73 /* In module TWL6030_MODULE_PM_MASTER */
  74 #define STS_HW_CONDITIONS               0x21
  75 #define STS_USB_ID                      BIT(2)
  76
  77 /* In module TWL6030_MODULE_PM_RECEIVER */
  78 #define VUSB_CFG_TRANS                  0x71
  79 #define VUSB_CFG_STATE                  0x72
  80 #define VUSB_CFG_VOLTAGE                0x73
  81
  82 /* in module TWL6030_MODULE_MAIN_CHARGE */
  83
  84 #define CHARGERUSB_CTRL1                0x8
  85
  86 #define CONTROLLER_STAT1                0x03
  87 #define VBUS_DET                        BIT(2)
  88
  89 struct twl6030_usb {
  90         struct otg_transceiver  otg;
  91         struct device           *dev;
  92
  93         /* for vbus reporting with irqs disabled */
  94         spinlock_t              lock;
  95
  96         struct regulator                *usb3v3;
  97
  98         int                     irq1;
  99         int                     irq2;
 100         u8                      linkstat;
 101         u8                      asleep;
 102         bool                    irq_enabled;
 103         unsigned long           features;
 104 };
 105
 106 #define xceiv_to_twl(x)         container_of((x), struct twl6030_usb, otg)
 107
 108 /*-------------------------------------------------------------------------*/
 109
 110 static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module,
 111                                                 u8 data, u8 address)
 112 {
 113         int ret = 0;
 114
 115         ret = twl_i2c_write_u8(module, data, address);
 116         if (ret < 0)
 117                 dev_err(twl->dev,
 118                         "Write[0x%x] Error %d\n", address, ret);
 119         return ret;
 120 }
 121
 122 static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address)
 123 {
 124         u8 data, ret = 0;
 125
 126         ret = twl_i2c_read_u8(module, &data, address);
 127         if (ret >= 0)
 128                 ret = data;
 129         else
 130                 dev_err(twl->dev,
 131                         "readb[0x%x,0x%x] Error %d\n",
 132                                         module, address, ret);
 133         return ret;
 134 }
 135
 136 /*-------------------------------------------------------------------------*/
 137 static int twl6030_set_phy_clk(struct otg_transceiver *x, int on)
 138 {
 139         struct twl6030_usb *twl;
 140         struct device *dev;
 141         struct twl4030_usb_data *pdata;
 142
 143         twl = xceiv_to_twl(x);
 144         dev  = twl->dev;
 145         pdata = dev->platform_data;
 146
 147         pdata->phy_set_clock(twl->dev, on);
 148
 149         return 0;
 150 }
 151
 152 static int twl6030_phy_init(struct otg_transceiver *x)
 153 {
 154         struct twl6030_usb *twl;
 155         struct device *dev;
 156         struct twl4030_usb_data *pdata;
 157
 158         twl = xceiv_to_twl(x);
 159         dev  = twl->dev;
 160         pdata = dev->platform_data;
 161
 162         if (twl->linkstat == USB_EVENT_ID)
 163                 pdata->phy_power(twl->dev, 1, 1);
 164         else
 165                 pdata->phy_power(twl->dev, 0, 1);
 166
 167         return 0;
 168 }
 169
 170 static void twl6030_phy_shutdown(struct otg_transceiver *x)
 171 {
 172         struct twl6030_usb *twl;
 173         struct device *dev;
 174         struct twl4030_usb_data *pdata;
 175
 176         twl = xceiv_to_twl(x);
 177         dev  = twl->dev;
 178         pdata = dev->platform_data;
 179         pdata->phy_power(twl->dev, 0, 0);
 180 }
 181
 182 static int twl6030_phy_suspend(struct otg_transceiver *x, int suspend)
 183 {
 184         struct twl6030_usb *twl = xceiv_to_twl(x);
 185         struct device *dev = twl->dev;
 186         struct twl4030_usb_data *pdata = dev->platform_data;
 187
 188         pdata->phy_suspend(dev, suspend);
 189
 190         return 0;
 191 }
 192
 193 static int twl6030_start_srp(struct otg_transceiver *x)
 194 {
 195         struct twl6030_usb *twl = xceiv_to_twl(x);
 196
 197         twl6030_writeb(twl, TWL_MODULE_USB, 0x24, USB_VBUS_CTRL_SET);
 198         twl6030_writeb(twl, TWL_MODULE_USB, 0x84, USB_VBUS_CTRL_SET);
 199
 200         mdelay(100);
 201         twl6030_writeb(twl, TWL_MODULE_USB, 0xa0, USB_VBUS_CTRL_CLR);
 202
 203         return 0;
 204 }
 205
 206 static int twl6030_usb_ldo_init(struct twl6030_usb *twl)
 207 {
 208         char *regulator_name;
 209
 210         if (twl->features & TWL6025_SUBCLASS)
 211                 regulator_name = "ldousb";
 212         else
 213                 regulator_name = "vusb";
 214
 215         /* Set to OTG_REV 1.3 and turn on the ID_WAKEUP_COMP */
 216         twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_BACKUP_REG);
 217
 218         /* Program CFG_LDO_PD2 register and set VUSB bit */
 219         twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_CFG_LDO_PD2);
 220
 221         /* Program MISC2 register and set bit VUSB_IN_VBAT */
 222         twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x10, TWL6030_MISC2);
 223
 224         twl->usb3v3 = regulator_get(twl->dev, regulator_name);
 225         if (IS_ERR(twl->usb3v3))
 226                 return -ENODEV;
 227
 228         /* Program the USB_VBUS_CTRL_SET and set VBUS_ACT_COMP bit */
 229         twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET);
 230
 231         /*
 232          * Program the USB_ID_CTRL_SET register to enable GND drive
 233          * and the ID comparators
 234          */
 235         twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET);
 236
 237         return 0;
 238 }
 239
 240 static ssize_t twl6030_usb_vbus_show(struct device *dev,
 241                         struct device_attribute *attr, char *buf)
 242 {
 243         struct twl6030_usb *twl = dev_get_drvdata(dev);
 244         unsigned long flags;
 245         int ret = -EINVAL;
 246
 247         spin_lock_irqsave(&twl->lock, flags);
 248
 249         switch (twl->linkstat) {
 250         case USB_EVENT_VBUS:
 251                ret = snprintf(buf, PAGE_SIZE, "vbus\n");
 252                break;
 253         case USB_EVENT_ID:
 254                ret = snprintf(buf, PAGE_SIZE, "id\n");
 255                break;
 256         case USB_EVENT_NONE:
 257                ret = snprintf(buf, PAGE_SIZE, "none\n");
 258                break;
 259         default:
 260                ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
 261         }
 262         spin_unlock_irqrestore(&twl->lock, flags);
 263
 264         return ret;
 265 }
 266 static DEVICE_ATTR(vbus, 0444, twl6030_usb_vbus_show, NULL);
 267
 268 static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
 269 {
 270         struct twl6030_usb *twl = _twl;
 271         int status;
 272         u8 vbus_state, hw_state;
 273
 274         hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
 275
 276         vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE,
 277                                                 CONTROLLER_STAT1);
 278         if (!(hw_state & STS_USB_ID)) {
 279                 if (vbus_state & VBUS_DET) {
 280                         regulator_enable(twl->usb3v3);
 281                         twl->asleep = 1;
 282                         status = USB_EVENT_VBUS;
 283                         twl->otg.default_a = false;
 284                         twl->otg.state = OTG_STATE_B_IDLE;
 285                         twl->linkstat = status;
 286                         twl->otg.last_event = status;
 287                         atomic_notifier_call_chain(&twl->otg.notifier,
 288                                                 status, twl->otg.gadget);
 289                 } else {
 290                         status = USB_EVENT_NONE;
 291                         twl->linkstat = status;
 292                         twl->otg.last_event = status;
 293                         atomic_notifier_call_chain(&twl->otg.notifier,
 294                                                 status, twl->otg.gadget);
 295                         if (twl->asleep) {
 296                                 regulator_disable(twl->usb3v3);
 297                                 twl->asleep = 0;
 298                         }
 299                 }
 300         }
 301         sysfs_notify(&twl->dev->kobj, NULL, "vbus");
 302
 303         return IRQ_HANDLED;
 304 }
 305
 306 static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
 307 {
 308         struct twl6030_usb *twl = _twl;
 309         int status = USB_EVENT_NONE;
 310         u8 hw_state;
 311
 312         hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
 313
 314         if (hw_state & STS_USB_ID) {
 315
 316                 regulator_enable(twl->usb3v3);
 317                 twl->asleep = 1;
 318                 twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_CLR, 0x1);
 319                 twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET,
 320                                                                 0x10);
 321                 status = USB_EVENT_ID;
 322                 twl->otg.default_a = true;
 323                 twl->otg.state = OTG_STATE_A_IDLE;
 324                 twl->linkstat = status;
 325                 twl->otg.last_event = status;
 326                 atomic_notifier_call_chain(&twl->otg.notifier, status,
 327                                                         twl->otg.gadget);
 328         } else  {
 329                 twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_CLR,
 330                                                                 0x10);
 331                 twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET,
 332                                                                 0x1);
 333         }
 334         twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_LATCH_CLR, status);
 335
 336         return IRQ_HANDLED;
 337 }
 338
 339 static int twl6030_set_peripheral(struct otg_transceiver *x,
 340                 struct usb_gadget *gadget)
 341 {
 342         struct twl6030_usb *twl;
 343
 344         if (!x)
 345                 return -ENODEV;
 346
 347         twl = xceiv_to_twl(x);
 348         twl->otg.gadget = gadget;
 349         if (!gadget)
 350                 twl->otg.state = OTG_STATE_UNDEFINED;
 351
 352         return 0;
 353 }
 354
 355 static int twl6030_enable_irq(struct otg_transceiver *x)
 356 {
 357         struct twl6030_usb *twl = xceiv_to_twl(x);
 358
 359         twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET, 0x1);
 360         twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C);
 361         twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C);
 362
 363         twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
 364                                 REG_INT_MSK_LINE_C);
 365         twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
 366                                 REG_INT_MSK_STS_C);
 367         twl6030_usb_irq(twl->irq2, twl);
 368         twl6030_usbotg_irq(twl->irq1, twl);
 369
 370         return 0;
 371 }
 372
 373 static int twl6030_set_vbus(struct otg_transceiver *x, bool enabled)
 374 {
 375         struct twl6030_usb *twl = xceiv_to_twl(x);
 376
 377         /*
 378          * Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
 379          * register. This enables boost mode.
 380          */
 381         if (enabled)
 382                 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x40,
 383                                                 CHARGERUSB_CTRL1);
 384          else
 385                 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x00,
 386                                                 CHARGERUSB_CTRL1);
 387         return 0;
 388 }
 389
 390 static int twl6030_set_host(struct otg_transceiver *x, struct usb_bus *host)
 391 {
 392         struct twl6030_usb *twl;
 393
 394         if (!x)
 395                 return -ENODEV;
 396
 397         twl = xceiv_to_twl(x);
 398         twl->otg.host = host;
 399         if (!host)
 400                 twl->otg.state = OTG_STATE_UNDEFINED;
 401         return 0;
 402 }
 403
 404 static int __devinit twl6030_usb_probe(struct platform_device *pdev)
 405 {
 406         struct twl6030_usb      *twl;
 407         int                     status, err;
 408         struct twl4030_usb_data *pdata;
 409         struct device *dev = &pdev->dev;
 410         pdata = dev->platform_data;
 411
 412         twl = kzalloc(sizeof *twl, GFP_KERNEL);
 413         if (!twl)
 414                 return -ENOMEM;
 415
 416         twl->dev                = &pdev->dev;
 417         twl->irq1               = platform_get_irq(pdev, 0);
 418         twl->irq2               = platform_get_irq(pdev, 1);
 419         twl->features           = pdata->features;
 420         twl->otg.dev            = twl->dev;
 421         twl->otg.label          = "twl6030";
 422         twl->otg.set_host       = twl6030_set_host;
 423         twl->otg.set_peripheral = twl6030_set_peripheral;
 424         twl->otg.set_vbus       = twl6030_set_vbus;
 425         twl->otg.init           = twl6030_phy_init;
 426         twl->otg.shutdown       = twl6030_phy_shutdown;
 427         twl->otg.set_suspend    = twl6030_phy_suspend;
 428         twl->otg.start_srp      = twl6030_start_srp;
 429
 430         /* init spinlock for workqueue */
 431         spin_lock_init(&twl->lock);
 432
 433         err = twl6030_usb_ldo_init(twl);
 434         if (err) {
 435                 dev_err(&pdev->dev, "ldo init failed\n");
 436                 kfree(twl);
 437                 return err;
 438         }
 439         otg_set_transceiver(&twl->otg);
 440
 441         platform_set_drvdata(pdev, twl);
 442         if (device_create_file(&pdev->dev, &dev_attr_vbus))
 443                 dev_warn(&pdev->dev, "could not create sysfs file\n");
 444
 445         ATOMIC_INIT_NOTIFIER_HEAD(&twl->otg.notifier);
 446
 447         twl->irq_enabled = true;
 448         status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
 449                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 450                         "twl6030_usb", twl);
 451         if (status < 0) {
 452                 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 453                         twl->irq1, status);
 454                 device_remove_file(twl->dev, &dev_attr_vbus);
 455                 kfree(twl);
 456                 return status;
 457         }
 458
 459         status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
 460                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 461                         "twl6030_usb", twl);
 462         if (status < 0) {
 463                 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 464                         twl->irq2, status);
 465                 free_irq(twl->irq1, twl);
 466                 device_remove_file(twl->dev, &dev_attr_vbus);
 467                 kfree(twl);
 468                 return status;
 469         }
 470
 471         twl->asleep = 0;
 472         pdata->phy_init(dev);
 473         twl6030_phy_suspend(&twl->otg, 0);
 474         twl6030_enable_irq(&twl->otg);
 475         dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");
 476
 477         return 0;
 478 }
 479
 480 static int __exit twl6030_usb_remove(struct platform_device *pdev)
 481 {
 482         struct twl6030_usb *twl = platform_get_drvdata(pdev);
 483
 484         struct twl4030_usb_data *pdata;
 485         struct device *dev = &pdev->dev;
 486         pdata = dev->platform_data;
 487
 488         twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
 489                 REG_INT_MSK_LINE_C);
 490         twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
 491                         REG_INT_MSK_STS_C);
 492         free_irq(twl->irq1, twl);
 493         free_irq(twl->irq2, twl);
 494         regulator_put(twl->usb3v3);
 495         pdata->phy_exit(twl->dev);
 496         device_remove_file(twl->dev, &dev_attr_vbus);
 497         kfree(twl);
 498
 499         return 0;
 500 }
 501
 502 static struct platform_driver twl6030_usb_driver = {
 503         .probe          = twl6030_usb_probe,
 504         .remove         = __exit_p(twl6030_usb_remove),
 505         .driver         = {
 506                 .name   = "twl6030_usb",
 507                 .owner  = THIS_MODULE,
 508         },
 509 };
 510
 511 static int __init twl6030_usb_init(void)
 512 {
 513         return platform_driver_register(&twl6030_usb_driver);
 514 }
 515 subsys_initcall(twl6030_usb_init);
 516
 517 static void __exit twl6030_usb_exit(void)
 518 {
 519         platform_driver_unregister(&twl6030_usb_driver);
 520 }
 521 module_exit(twl6030_usb_exit);
 522
 523 MODULE_ALIAS("platform:twl6030_usb");
 524 MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
 525 MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
 526 MODULE_LICENSE("GPL");