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 };
 112
 113 #define comparator_to_twl(x) container_of((x), struct twl6030_usb, comparator)
 114
 115 /*-------------------------------------------------------------------------*/
 116
 117 static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module,
 118                                                 u8 data, u8 address)
 119 {
 120         int ret = 0;
 121
 122         ret = twl_i2c_write_u8(module, data, address);
 123         if (ret < 0)
 124                 dev_err(twl->dev,
 125                         "Write[0x%x] Error %d\n", address, ret);
 126         return ret;
 127 }
 128
 129 static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address)
 130 {
 131         u8 data;
 132         int ret;
 133
 134         ret = twl_i2c_read_u8(module, &data, address);
 135         if (ret >= 0)
 136                 ret = data;
 137         else
 138                 dev_err(twl->dev,
 139                         "readb[0x%x,0x%x] Error %d\n",
 140                                         module, address, ret);
 141         return ret;
 142 }
 143
 144 static int twl6030_start_srp(struct phy_companion *comparator)
 145 {
 146         struct twl6030_usb *twl = comparator_to_twl(comparator);
 147
 148         twl6030_writeb(twl, TWL_MODULE_USB, 0x24, USB_VBUS_CTRL_SET);
 149         twl6030_writeb(twl, TWL_MODULE_USB, 0x84, USB_VBUS_CTRL_SET);
 150
 151         mdelay(100);
 152         twl6030_writeb(twl, TWL_MODULE_USB, 0xa0, USB_VBUS_CTRL_CLR);
 153
 154         return 0;
 155 }
 156
 157 static int twl6030_usb_ldo_init(struct twl6030_usb *twl)
 158 {
 159         /* Set to OTG_REV 1.3 and turn on the ID_WAKEUP_COMP */
 160         twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x1, TWL6030_BACKUP_REG);
 161
 162         /* Program CFG_LDO_PD2 register and set VUSB bit */
 163         twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x1, TWL6030_CFG_LDO_PD2);
 164
 165         /* Program MISC2 register and set bit VUSB_IN_VBAT */
 166         twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x10, TWL6030_MISC2);
 167
 168         twl->usb3v3 = regulator_get(twl->dev, "usb");
 169         if (IS_ERR(twl->usb3v3))
 170                 return -ENODEV;
 171
 172         /* Program the USB_VBUS_CTRL_SET and set VBUS_ACT_COMP bit */
 173         twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET);
 174
 175         /*
 176          * Program the USB_ID_CTRL_SET register to enable GND drive
 177          * and the ID comparators
 178          */
 179         twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET);
 180
 181         return 0;
 182 }
 183
 184 static ssize_t twl6030_usb_vbus_show(struct device *dev,
 185                         struct device_attribute *attr, char *buf)
 186 {
 187         struct twl6030_usb *twl = dev_get_drvdata(dev);
 188         unsigned long flags;
 189         int ret = -EINVAL;
 190
 191         spin_lock_irqsave(&twl->lock, flags);
 192
 193         switch (twl->linkstat) {
 194         case MUSB_VBUS_VALID:
 195                ret = snprintf(buf, PAGE_SIZE, "vbus\n");
 196                break;
 197         case MUSB_ID_GROUND:
 198                ret = snprintf(buf, PAGE_SIZE, "id\n");
 199                break;
 200         case MUSB_VBUS_OFF:
 201                ret = snprintf(buf, PAGE_SIZE, "none\n");
 202                break;
 203         default:
 204                ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
 205         }
 206         spin_unlock_irqrestore(&twl->lock, flags);
 207
 208         return ret;
 209 }
 210 static DEVICE_ATTR(vbus, 0444, twl6030_usb_vbus_show, NULL);
 211
 212 static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
 213 {
 214         struct twl6030_usb *twl = _twl;
 215         enum musb_vbus_id_status status = MUSB_UNKNOWN;
 216         u8 vbus_state, hw_state;
 217         int ret;
 218
 219         hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
 220
 221         vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE,
 222                                                 CONTROLLER_STAT1);
 223         if (!(hw_state & STS_USB_ID)) {
 224                 if (vbus_state & VBUS_DET) {
 225                         ret = regulator_enable(twl->usb3v3);
 226                         if (ret)
 227                                 dev_err(twl->dev, "Failed to enable usb3v3\n");
 228
 229                         twl->asleep = 1;
 230                         status = MUSB_VBUS_VALID;
 231                         twl->linkstat = status;
 232                         ret = musb_mailbox(status);
 233                         if (ret)
 234                                 twl->linkstat = MUSB_UNKNOWN;
 235                 } else {
 236                         if (twl->linkstat != MUSB_UNKNOWN) {
 237                                 status = MUSB_VBUS_OFF;
 238                                 twl->linkstat = status;
 239                                 ret = musb_mailbox(status);
 240                                 if (ret)
 241                                         twl->linkstat = MUSB_UNKNOWN;
 242                                 if (twl->asleep) {
 243                                         regulator_disable(twl->usb3v3);
 244                                         twl->asleep = 0;
 245                                 }
 246                         }
 247                 }
 248         }
 249         sysfs_notify(&twl->dev->kobj, NULL, "vbus");
 250
 251         return IRQ_HANDLED;
 252 }
 253
 254 static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
 255 {
 256         struct twl6030_usb *twl = _twl;
 257         enum musb_vbus_id_status status = MUSB_UNKNOWN;
 258         u8 hw_state;
 259         int ret;
 260
 261         hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
 262
 263         if (hw_state & STS_USB_ID) {
 264                 ret = regulator_enable(twl->usb3v3);
 265                 if (ret)
 266                         dev_err(twl->dev, "Failed to enable usb3v3\n");
 267
 268                 twl->asleep = 1;
 269                 twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_CLR);
 270                 twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_SET);
 271                 status = MUSB_ID_GROUND;
 272                 twl->linkstat = status;
 273                 ret = musb_mailbox(status);
 274                 if (ret)
 275                         twl->linkstat = MUSB_UNKNOWN;
 276         } else  {
 277                 twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_CLR);
 278                 twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
 279         }
 280         twl6030_writeb(twl, TWL_MODULE_USB, status, USB_ID_INT_LATCH_CLR);
 281
 282         return IRQ_HANDLED;
 283 }
 284
 285 static void twl6030_status_work(struct work_struct *work)
 286 {
 287         struct twl6030_usb *twl = container_of(work, struct twl6030_usb,
 288                                                get_status_work.work);
 289
 290         twl6030_usb_irq(twl->irq2, twl);
 291         twl6030_usbotg_irq(twl->irq1, twl);
 292 }
 293
 294 static int twl6030_enable_irq(struct twl6030_usb *twl)
 295 {
 296         twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
 297         twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C);
 298         twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C);
 299
 300         twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
 301                                 REG_INT_MSK_LINE_C);
 302         twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
 303                                 REG_INT_MSK_STS_C);
 304
 305         return 0;
 306 }
 307
 308 static void otg_set_vbus_work(struct work_struct *data)
 309 {
 310         struct twl6030_usb *twl = container_of(data, struct twl6030_usb,
 311                                                                 set_vbus_work);
 312
 313         /*
 314          * Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
 315          * register. This enables boost mode.
 316          */
 317
 318         if (twl->vbus_enable)
 319                 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE, 0x40,
 320                                                         CHARGERUSB_CTRL1);
 321         else
 322                 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE, 0x00,
 323                                                         CHARGERUSB_CTRL1);
 324 }
 325
 326 static int twl6030_set_vbus(struct phy_companion *comparator, bool enabled)
 327 {
 328         struct twl6030_usb *twl = comparator_to_twl(comparator);
 329
 330         twl->vbus_enable = enabled;
 331         schedule_work(&twl->set_vbus_work);
 332
 333         return 0;
 334 }
 335
 336 static int twl6030_usb_probe(struct platform_device *pdev)
 337 {
 338         u32 ret;
 339         struct twl6030_usb      *twl;
 340         int                     status, err;
 341         struct device_node      *np = pdev->dev.of_node;
 342         struct device           *dev = &pdev->dev;
 343
 344         if (!np) {
 345                 dev_err(dev, "no DT info\n");
 346                 return -EINVAL;
 347         }
 348
 349         twl = devm_kzalloc(dev, sizeof(*twl), GFP_KERNEL);
 350         if (!twl)
 351                 return -ENOMEM;
 352
 353         twl->dev                = &pdev->dev;
 354         twl->irq1               = platform_get_irq(pdev, 0);
 355         twl->irq2               = platform_get_irq(pdev, 1);
 356         twl->linkstat           = MUSB_UNKNOWN;
 357
 358         twl->comparator.set_vbus        = twl6030_set_vbus;
 359         twl->comparator.start_srp       = twl6030_start_srp;
 360
 361         ret = omap_usb2_set_comparator(&twl->comparator);
 362         if (ret == -ENODEV) {
 363                 dev_info(&pdev->dev, "phy not ready, deferring probe");
 364                 return -EPROBE_DEFER;
 365         }
 366
 367         /* init spinlock for workqueue */
 368         spin_lock_init(&twl->lock);
 369
 370         err = twl6030_usb_ldo_init(twl);
 371         if (err) {
 372                 dev_err(&pdev->dev, "ldo init failed\n");
 373                 return err;
 374         }
 375
 376         platform_set_drvdata(pdev, twl);
 377         if (device_create_file(&pdev->dev, &dev_attr_vbus))
 378                 dev_warn(&pdev->dev, "could not create sysfs file\n");
 379
 380         INIT_WORK(&twl->set_vbus_work, otg_set_vbus_work);
 381         INIT_DELAYED_WORK(&twl->get_status_work, twl6030_status_work);
 382
 383         status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
 384                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 385                         "twl6030_usb", twl);
 386         if (status < 0) {
 387                 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 388                         twl->irq1, status);
 389                 device_remove_file(twl->dev, &dev_attr_vbus);
 390                 return status;
 391         }
 392
 393         status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
 394                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 395                         "twl6030_usb", twl);
 396         if (status < 0) {
 397                 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 398                         twl->irq2, status);
 399                 free_irq(twl->irq1, twl);
 400                 device_remove_file(twl->dev, &dev_attr_vbus);
 401                 return status;
 402         }
 403
 404         twl->asleep = 0;
 405         twl6030_enable_irq(twl);
 406         schedule_delayed_work(&twl->get_status_work, HZ);
 407         dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");
 408
 409         return 0;
 410 }
 411
 412 static int twl6030_usb_remove(struct platform_device *pdev)
 413 {
 414         struct twl6030_usb *twl = platform_get_drvdata(pdev);
 415
 416         cancel_delayed_work(&twl->get_status_work);
 417         twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
 418                 REG_INT_MSK_LINE_C);
 419         twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
 420                         REG_INT_MSK_STS_C);
 421         free_irq(twl->irq1, twl);
 422         free_irq(twl->irq2, twl);
 423         regulator_put(twl->usb3v3);
 424         device_remove_file(twl->dev, &dev_attr_vbus);
 425         cancel_work_sync(&twl->set_vbus_work);
 426
 427         return 0;
 428 }
 429
 430 static const struct of_device_id twl6030_usb_id_table[] = {
 431         { .compatible = "ti,twl6030-usb" },
 432         {}
 433 };
 434 MODULE_DEVICE_TABLE(of, twl6030_usb_id_table);
 435
 436 static struct platform_driver twl6030_usb_driver = {
 437         .probe          = twl6030_usb_probe,
 438         .remove         = twl6030_usb_remove,
 439         .driver         = {
 440                 .name   = "twl6030_usb",
 441                 .of_match_table = of_match_ptr(twl6030_usb_id_table),
 442         },
 443 };
 444
 445 static int __init twl6030_usb_init(void)
 446 {
 447         return platform_driver_register(&twl6030_usb_driver);
 448 }
 449 subsys_initcall(twl6030_usb_init);
 450
 451 static void __exit twl6030_usb_exit(void)
 452 {
 453         platform_driver_unregister(&twl6030_usb_driver);
 454 }
 455 module_exit(twl6030_usb_exit);
 456
 457 MODULE_ALIAS("platform:twl6030_usb");
 458 MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
 459 MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
 460 MODULE_LICENSE("GPL");