drivers/usb/phy/phy-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/musb.h>
  29 #include <linux/usb/phy_companion.h>
  30 #include <linux/phy/omap_usb.h>
  31 #include <linux/i2c/twl.h>
  32 #include <linux/regulator/consumer.h>
  33 #include <linux/err.h>
  34 #include <linux/slab.h>
  35 #include <linux/delay.h>
  36 #include <linux/of.h>
  37
  38 /* usb register definitions */
  39 #define USB_VENDOR_ID_LSB               0x00
  40 #define USB_VENDOR_ID_MSB               0x01
  41 #define USB_PRODUCT_ID_LSB              0x02
  42 #define USB_PRODUCT_ID_MSB              0x03
  43 #define USB_VBUS_CTRL_SET               0x04
  44 #define USB_VBUS_CTRL_CLR               0x05
  45 #define USB_ID_CTRL_SET                 0x06
  46 #define USB_ID_CTRL_CLR                 0x07
  47 #define USB_VBUS_INT_SRC                0x08
  48 #define USB_VBUS_INT_LATCH_SET          0x09
  49 #define USB_VBUS_INT_LATCH_CLR          0x0A
  50 #define USB_VBUS_INT_EN_LO_SET          0x0B
  51 #define USB_VBUS_INT_EN_LO_CLR          0x0C
  52 #define USB_VBUS_INT_EN_HI_SET          0x0D
  53 #define USB_VBUS_INT_EN_HI_CLR          0x0E
  54 #define USB_ID_INT_SRC                  0x0F
  55 #define USB_ID_INT_LATCH_SET            0x10
  56 #define USB_ID_INT_LATCH_CLR            0x11
  57
  58 #define USB_ID_INT_EN_LO_SET            0x12
  59 #define USB_ID_INT_EN_LO_CLR            0x13
  60 #define USB_ID_INT_EN_HI_SET            0x14
  61 #define USB_ID_INT_EN_HI_CLR            0x15
  62 #define USB_OTG_ADP_CTRL                0x16
  63 #define USB_OTG_ADP_HIGH                0x17
  64 #define USB_OTG_ADP_LOW                 0x18
  65 #define USB_OTG_ADP_RISE                0x19
  66 #define USB_OTG_REVISION                0x1A
  67
  68 /* to be moved to LDO */
  69 #define TWL6030_MISC2                   0xE5
  70 #define TWL6030_CFG_LDO_PD2             0xF5
  71 #define TWL6030_BACKUP_REG              0xFA
  72
  73 #define STS_HW_CONDITIONS               0x21
  74
  75 /* In module TWL6030_MODULE_PM_MASTER */
  76 #define STS_HW_CONDITIONS               0x21
  77 #define STS_USB_ID                      BIT(2)
  78
  79 /* In module TWL6030_MODULE_PM_RECEIVER */
  80 #define VUSB_CFG_TRANS                  0x71
  81 #define VUSB_CFG_STATE                  0x72
  82 #define VUSB_CFG_VOLTAGE                0x73
  83
  84 /* in module TWL6030_MODULE_MAIN_CHARGE */
  85
  86 #define CHARGERUSB_CTRL1                0x8
  87
  88 #define CONTROLLER_STAT1                0x03
  89 #define VBUS_DET                        BIT(2)
  90
  91 struct twl6030_usb {
  92         struct phy_companion    comparator;
  93         struct device           *dev;
  94
  95         /* for vbus reporting with irqs disabled */
  96         spinlock_t              lock;
  97
  98         struct regulator                *usb3v3;
  99
 100         /* used to check initial cable status after probe */
 101         struct delayed_work     get_status_work;
 102
 103         /* used to set vbus, in atomic path */
 104         struct work_struct      set_vbus_work;
 105
 106         int                     irq1;
 107         int                     irq2;
 108         enum musb_vbus_id_status linkstat;
 109         u8                      asleep;
 110         bool                    vbus_enable;
 111         const char              *regulator;
 112 };
 113
 114 #define comparator_to_twl(x) container_of((x), struct twl6030_usb, comparator)
 115
 116 /*-------------------------------------------------------------------------*/
 117
 118 static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module,
 119                                                 u8 data, u8 address)
 120 {
 121         int ret = 0;
 122
 123         ret = twl_i2c_write_u8(module, data, address);
 124         if (ret < 0)
 125                 dev_err(twl->dev,
 126                         "Write[0x%x] Error %d\n", address, ret);
 127         return ret;
 128 }
 129
 130 static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address)
 131 {
 132         u8 data;
 133         int ret;
 134
 135         ret = twl_i2c_read_u8(module, &data, address);
 136         if (ret >= 0)
 137                 ret = data;
 138         else
 139                 dev_err(twl->dev,
 140                         "readb[0x%x,0x%x] Error %d\n",
 141                                         module, address, ret);
 142         return ret;
 143 }
 144
 145 static int twl6030_start_srp(struct phy_companion *comparator)
 146 {
 147         struct twl6030_usb *twl = comparator_to_twl(comparator);
 148
 149         twl6030_writeb(twl, TWL_MODULE_USB, 0x24, USB_VBUS_CTRL_SET);
 150         twl6030_writeb(twl, TWL_MODULE_USB, 0x84, USB_VBUS_CTRL_SET);
 151
 152         mdelay(100);
 153         twl6030_writeb(twl, TWL_MODULE_USB, 0xa0, USB_VBUS_CTRL_CLR);
 154
 155         return 0;
 156 }
 157
 158 static int twl6030_usb_ldo_init(struct twl6030_usb *twl)
 159 {
 160         /* Set to OTG_REV 1.3 and turn on the ID_WAKEUP_COMP */
 161         twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x1, TWL6030_BACKUP_REG);
 162
 163         /* Program CFG_LDO_PD2 register and set VUSB bit */
 164         twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x1, TWL6030_CFG_LDO_PD2);
 165
 166         /* Program MISC2 register and set bit VUSB_IN_VBAT */
 167         twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x10, TWL6030_MISC2);
 168
 169         twl->usb3v3 = regulator_get(twl->dev, twl->regulator);
 170         if (IS_ERR(twl->usb3v3))
 171                 return -ENODEV;
 172
 173         /* Program the USB_VBUS_CTRL_SET and set VBUS_ACT_COMP bit */
 174         twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET);
 175
 176         /*
 177          * Program the USB_ID_CTRL_SET register to enable GND drive
 178          * and the ID comparators
 179          */
 180         twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET);
 181
 182         return 0;
 183 }
 184
 185 static ssize_t twl6030_usb_vbus_show(struct device *dev,
 186                         struct device_attribute *attr, char *buf)
 187 {
 188         struct twl6030_usb *twl = dev_get_drvdata(dev);
 189         unsigned long flags;
 190         int ret = -EINVAL;
 191
 192         spin_lock_irqsave(&twl->lock, flags);
 193
 194         switch (twl->linkstat) {
 195         case MUSB_VBUS_VALID:
 196                ret = snprintf(buf, PAGE_SIZE, "vbus\n");
 197                break;
 198         case MUSB_ID_GROUND:
 199                ret = snprintf(buf, PAGE_SIZE, "id\n");
 200                break;
 201         case MUSB_VBUS_OFF:
 202                ret = snprintf(buf, PAGE_SIZE, "none\n");
 203                break;
 204         default:
 205                ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
 206         }
 207         spin_unlock_irqrestore(&twl->lock, flags);
 208
 209         return ret;
 210 }
 211 static DEVICE_ATTR(vbus, 0444, twl6030_usb_vbus_show, NULL);
 212
 213 static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
 214 {
 215         struct twl6030_usb *twl = _twl;
 216         enum musb_vbus_id_status status = MUSB_UNKNOWN;
 217         u8 vbus_state, hw_state;
 218         int ret;
 219
 220         hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
 221
 222         vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE,
 223                                                 CONTROLLER_STAT1);
 224         if (!(hw_state & STS_USB_ID)) {
 225                 if (vbus_state & VBUS_DET) {
 226                         ret = regulator_enable(twl->usb3v3);
 227                         if (ret)
 228                                 dev_err(twl->dev, "Failed to enable usb3v3\n");
 229
 230                         twl->asleep = 1;
 231                         status = MUSB_VBUS_VALID;
 232                         twl->linkstat = status;
 233                         ret = musb_mailbox(status);
 234                         if (ret)
 235                                 twl->linkstat = MUSB_UNKNOWN;
 236                 } else {
 237                         if (twl->linkstat != MUSB_UNKNOWN) {
 238                                 status = MUSB_VBUS_OFF;
 239                                 twl->linkstat = status;
 240                                 ret = musb_mailbox(status);
 241                                 if (ret)
 242                                         twl->linkstat = MUSB_UNKNOWN;
 243                                 if (twl->asleep) {
 244                                         regulator_disable(twl->usb3v3);
 245                                         twl->asleep = 0;
 246                                 }
 247                         }
 248                 }
 249         }
 250         sysfs_notify(&twl->dev->kobj, NULL, "vbus");
 251
 252         return IRQ_HANDLED;
 253 }
 254
 255 static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
 256 {
 257         struct twl6030_usb *twl = _twl;
 258         enum musb_vbus_id_status status = MUSB_UNKNOWN;
 259         u8 hw_state;
 260         int ret;
 261
 262         hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
 263
 264         if (hw_state & STS_USB_ID) {
 265                 ret = regulator_enable(twl->usb3v3);
 266                 if (ret)
 267                         dev_err(twl->dev, "Failed to enable usb3v3\n");
 268
 269                 twl->asleep = 1;
 270                 twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_CLR);
 271                 twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_SET);
 272                 status = MUSB_ID_GROUND;
 273                 twl->linkstat = status;
 274                 ret = musb_mailbox(status);
 275                 if (ret)
 276                         twl->linkstat = MUSB_UNKNOWN;
 277         } else  {
 278                 twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_CLR);
 279                 twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
 280         }
 281         twl6030_writeb(twl, TWL_MODULE_USB, status, USB_ID_INT_LATCH_CLR);
 282
 283         return IRQ_HANDLED;
 284 }
 285
 286 static void twl6030_status_work(struct work_struct *work)
 287 {
 288         struct twl6030_usb *twl = container_of(work, struct twl6030_usb,
 289                                                get_status_work.work);
 290
 291         twl6030_usb_irq(twl->irq2, twl);
 292         twl6030_usbotg_irq(twl->irq1, twl);
 293 }
 294
 295 static int twl6030_enable_irq(struct twl6030_usb *twl)
 296 {
 297         twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
 298         twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C);
 299         twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C);
 300
 301         twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
 302                                 REG_INT_MSK_LINE_C);
 303         twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
 304                                 REG_INT_MSK_STS_C);
 305
 306         return 0;
 307 }
 308
 309 static void otg_set_vbus_work(struct work_struct *data)
 310 {
 311         struct twl6030_usb *twl = container_of(data, struct twl6030_usb,
 312                                                                 set_vbus_work);
 313
 314         /*
 315          * Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
 316          * register. This enables boost mode.
 317          */
 318
 319         if (twl->vbus_enable)
 320                 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE, 0x40,
 321                                                         CHARGERUSB_CTRL1);
 322         else
 323                 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE, 0x00,
 324                                                         CHARGERUSB_CTRL1);
 325 }
 326
 327 static int twl6030_set_vbus(struct phy_companion *comparator, bool enabled)
 328 {
 329         struct twl6030_usb *twl = comparator_to_twl(comparator);
 330
 331         twl->vbus_enable = enabled;
 332         schedule_work(&twl->set_vbus_work);
 333
 334         return 0;
 335 }
 336
 337 static int twl6030_usb_probe(struct platform_device *pdev)
 338 {
 339         u32 ret;
 340         struct twl6030_usb      *twl;
 341         int                     status, err;
 342         struct device_node      *np = pdev->dev.of_node;
 343         struct device           *dev = &pdev->dev;
 344         struct twl4030_usb_data *pdata = dev_get_platdata(dev);
 345
 346         twl = devm_kzalloc(dev, sizeof(*twl), GFP_KERNEL);
 347         if (!twl)
 348                 return -ENOMEM;
 349
 350         twl->dev                = &pdev->dev;
 351         twl->irq1               = platform_get_irq(pdev, 0);
 352         twl->irq2               = platform_get_irq(pdev, 1);
 353         twl->linkstat           = MUSB_UNKNOWN;
 354
 355         twl->comparator.set_vbus        = twl6030_set_vbus;
 356         twl->comparator.start_srp       = twl6030_start_srp;
 357
 358         ret = omap_usb2_set_comparator(&twl->comparator);
 359         if (ret == -ENODEV) {
 360                 dev_info(&pdev->dev, "phy not ready, deferring probe");
 361                 return -EPROBE_DEFER;
 362         }
 363
 364         if (np) {
 365                 twl->regulator = "usb";
 366         } else if (pdata) {
 367                 if (pdata->features & TWL6032_SUBCLASS)
 368                         twl->regulator = "ldousb";
 369                 else
 370                         twl->regulator = "vusb";
 371         } else {
 372                 dev_err(&pdev->dev, "twl6030 initialized without pdata\n");
 373                 return -EINVAL;
 374         }
 375
 376         /* init spinlock for workqueue */
 377         spin_lock_init(&twl->lock);
 378
 379         err = twl6030_usb_ldo_init(twl);
 380         if (err) {
 381                 dev_err(&pdev->dev, "ldo init failed\n");
 382                 return err;
 383         }
 384
 385         platform_set_drvdata(pdev, twl);
 386         if (device_create_file(&pdev->dev, &dev_attr_vbus))
 387                 dev_warn(&pdev->dev, "could not create sysfs file\n");
 388
 389         INIT_WORK(&twl->set_vbus_work, otg_set_vbus_work);
 390         INIT_DELAYED_WORK(&twl->get_status_work, twl6030_status_work);
 391
 392         status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
 393                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 394                         "twl6030_usb", twl);
 395         if (status < 0) {
 396                 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 397                         twl->irq1, status);
 398                 device_remove_file(twl->dev, &dev_attr_vbus);
 399                 return status;
 400         }
 401
 402         status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
 403                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 404                         "twl6030_usb", twl);
 405         if (status < 0) {
 406                 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 407                         twl->irq2, status);
 408                 free_irq(twl->irq1, twl);
 409                 device_remove_file(twl->dev, &dev_attr_vbus);
 410                 return status;
 411         }
 412
 413         twl->asleep = 0;
 414         twl6030_enable_irq(twl);
 415         schedule_delayed_work(&twl->get_status_work, HZ);
 416         dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");
 417
 418         return 0;
 419 }
 420
 421 static int twl6030_usb_remove(struct platform_device *pdev)
 422 {
 423         struct twl6030_usb *twl = platform_get_drvdata(pdev);
 424
 425         cancel_delayed_work(&twl->get_status_work);
 426         twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
 427                 REG_INT_MSK_LINE_C);
 428         twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
 429                         REG_INT_MSK_STS_C);
 430         free_irq(twl->irq1, twl);
 431         free_irq(twl->irq2, twl);
 432         regulator_put(twl->usb3v3);
 433         device_remove_file(twl->dev, &dev_attr_vbus);
 434         cancel_work_sync(&twl->set_vbus_work);
 435
 436         return 0;
 437 }
 438
 439 #ifdef CONFIG_OF
 440 static const struct of_device_id twl6030_usb_id_table[] = {
 441         { .compatible = "ti,twl6030-usb" },
 442         {}
 443 };
 444 MODULE_DEVICE_TABLE(of, twl6030_usb_id_table);
 445 #endif
 446
 447 static struct platform_driver twl6030_usb_driver = {
 448         .probe          = twl6030_usb_probe,
 449         .remove         = twl6030_usb_remove,
 450         .driver         = {
 451                 .name   = "twl6030_usb",
 452                 .of_match_table = of_match_ptr(twl6030_usb_id_table),
 453         },
 454 };
 455
 456 static int __init twl6030_usb_init(void)
 457 {
 458         return platform_driver_register(&twl6030_usb_driver);
 459 }
 460 subsys_initcall(twl6030_usb_init);
 461
 462 static void __exit twl6030_usb_exit(void)
 463 {
 464         platform_driver_unregister(&twl6030_usb_driver);
 465 }
 466 module_exit(twl6030_usb_exit);
 467
 468 MODULE_ALIAS("platform:twl6030_usb");
 469 MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
 470 MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
 471 MODULE_LICENSE("GPL");