Hema HK | c33fad0 | 2010-12-10 17:58:20 +0530 | [diff] [blame] | 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 | |
| 35 | /* usb register definitions */ |
| 36 | #define USB_VENDOR_ID_LSB 0x00 |
| 37 | #define USB_VENDOR_ID_MSB 0x01 |
| 38 | #define USB_PRODUCT_ID_LSB 0x02 |
| 39 | #define USB_PRODUCT_ID_MSB 0x03 |
| 40 | #define USB_VBUS_CTRL_SET 0x04 |
| 41 | #define USB_VBUS_CTRL_CLR 0x05 |
| 42 | #define USB_ID_CTRL_SET 0x06 |
| 43 | #define USB_ID_CTRL_CLR 0x07 |
| 44 | #define USB_VBUS_INT_SRC 0x08 |
| 45 | #define USB_VBUS_INT_LATCH_SET 0x09 |
| 46 | #define USB_VBUS_INT_LATCH_CLR 0x0A |
| 47 | #define USB_VBUS_INT_EN_LO_SET 0x0B |
| 48 | #define USB_VBUS_INT_EN_LO_CLR 0x0C |
| 49 | #define USB_VBUS_INT_EN_HI_SET 0x0D |
| 50 | #define USB_VBUS_INT_EN_HI_CLR 0x0E |
| 51 | #define USB_ID_INT_SRC 0x0F |
| 52 | #define USB_ID_INT_LATCH_SET 0x10 |
| 53 | #define USB_ID_INT_LATCH_CLR 0x11 |
| 54 | |
| 55 | #define USB_ID_INT_EN_LO_SET 0x12 |
| 56 | #define USB_ID_INT_EN_LO_CLR 0x13 |
| 57 | #define USB_ID_INT_EN_HI_SET 0x14 |
| 58 | #define USB_ID_INT_EN_HI_CLR 0x15 |
| 59 | #define USB_OTG_ADP_CTRL 0x16 |
| 60 | #define USB_OTG_ADP_HIGH 0x17 |
| 61 | #define USB_OTG_ADP_LOW 0x18 |
| 62 | #define USB_OTG_ADP_RISE 0x19 |
| 63 | #define USB_OTG_REVISION 0x1A |
| 64 | |
| 65 | /* to be moved to LDO */ |
| 66 | #define TWL6030_MISC2 0xE5 |
| 67 | #define TWL6030_CFG_LDO_PD2 0xF5 |
| 68 | #define TWL6030_BACKUP_REG 0xFA |
| 69 | |
| 70 | #define STS_HW_CONDITIONS 0x21 |
| 71 | |
| 72 | /* In module TWL6030_MODULE_PM_MASTER */ |
| 73 | #define STS_HW_CONDITIONS 0x21 |
| 74 | #define STS_USB_ID BIT(2) |
| 75 | |
| 76 | /* In module TWL6030_MODULE_PM_RECEIVER */ |
| 77 | #define VUSB_CFG_TRANS 0x71 |
| 78 | #define VUSB_CFG_STATE 0x72 |
| 79 | #define VUSB_CFG_VOLTAGE 0x73 |
| 80 | |
| 81 | /* in module TWL6030_MODULE_MAIN_CHARGE */ |
| 82 | |
| 83 | #define CHARGERUSB_CTRL1 0x8 |
| 84 | |
| 85 | #define CONTROLLER_STAT1 0x03 |
| 86 | #define VBUS_DET BIT(2) |
| 87 | |
| 88 | struct twl6030_usb { |
| 89 | struct otg_transceiver otg; |
| 90 | struct device *dev; |
| 91 | |
| 92 | /* for vbus reporting with irqs disabled */ |
| 93 | spinlock_t lock; |
| 94 | |
| 95 | struct regulator *usb3v3; |
| 96 | |
| 97 | int irq1; |
| 98 | int irq2; |
| 99 | u8 linkstat; |
| 100 | u8 asleep; |
| 101 | bool irq_enabled; |
| 102 | }; |
| 103 | |
| 104 | #define xceiv_to_twl(x) container_of((x), struct twl6030_usb, otg); |
| 105 | |
| 106 | /*-------------------------------------------------------------------------*/ |
| 107 | |
| 108 | static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module, |
| 109 | u8 data, u8 address) |
| 110 | { |
| 111 | int ret = 0; |
| 112 | |
| 113 | ret = twl_i2c_write_u8(module, data, address); |
| 114 | if (ret < 0) |
| 115 | dev_err(twl->dev, |
| 116 | "Write[0x%x] Error %d\n", address, ret); |
| 117 | return ret; |
| 118 | } |
| 119 | |
| 120 | static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address) |
| 121 | { |
| 122 | u8 data, ret = 0; |
| 123 | |
| 124 | ret = twl_i2c_read_u8(module, &data, address); |
| 125 | if (ret >= 0) |
| 126 | ret = data; |
| 127 | else |
| 128 | dev_err(twl->dev, |
| 129 | "readb[0x%x,0x%x] Error %d\n", |
| 130 | module, address, ret); |
| 131 | return ret; |
| 132 | } |
| 133 | |
| 134 | /*-------------------------------------------------------------------------*/ |
| 135 | static int twl6030_set_phy_clk(struct otg_transceiver *x, int on) |
| 136 | { |
| 137 | struct twl6030_usb *twl; |
| 138 | struct device *dev; |
| 139 | struct twl4030_usb_data *pdata; |
| 140 | |
| 141 | twl = xceiv_to_twl(x); |
| 142 | dev = twl->dev; |
| 143 | pdata = dev->platform_data; |
| 144 | |
| 145 | pdata->phy_set_clock(twl->dev, on); |
| 146 | |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | static int twl6030_phy_init(struct otg_transceiver *x) |
| 151 | { |
| 152 | u8 hw_state; |
| 153 | struct twl6030_usb *twl; |
| 154 | struct device *dev; |
| 155 | struct twl4030_usb_data *pdata; |
| 156 | |
| 157 | twl = xceiv_to_twl(x); |
| 158 | dev = twl->dev; |
| 159 | pdata = dev->platform_data; |
| 160 | |
| 161 | regulator_enable(twl->usb3v3); |
| 162 | |
| 163 | hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS); |
| 164 | |
| 165 | if (hw_state & STS_USB_ID) |
| 166 | pdata->phy_power(twl->dev, 1, 1); |
| 167 | else |
| 168 | pdata->phy_power(twl->dev, 0, 1); |
| 169 | |
| 170 | return 0; |
| 171 | } |
| 172 | |
| 173 | static void twl6030_phy_shutdown(struct otg_transceiver *x) |
| 174 | { |
| 175 | struct twl6030_usb *twl; |
| 176 | struct device *dev; |
| 177 | struct twl4030_usb_data *pdata; |
| 178 | |
| 179 | twl = xceiv_to_twl(x); |
| 180 | dev = twl->dev; |
| 181 | pdata = dev->platform_data; |
| 182 | pdata->phy_power(twl->dev, 0, 0); |
| 183 | regulator_disable(twl->usb3v3); |
| 184 | } |
| 185 | |
| 186 | static int twl6030_usb_ldo_init(struct twl6030_usb *twl) |
| 187 | { |
| 188 | |
| 189 | /* Set to OTG_REV 1.3 and turn on the ID_WAKEUP_COMP */ |
| 190 | twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_BACKUP_REG); |
| 191 | |
| 192 | /* Program CFG_LDO_PD2 register and set VUSB bit */ |
| 193 | twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_CFG_LDO_PD2); |
| 194 | |
| 195 | /* Program MISC2 register and set bit VUSB_IN_VBAT */ |
| 196 | twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x10, TWL6030_MISC2); |
| 197 | |
| 198 | twl->usb3v3 = regulator_get(twl->dev, "vusb"); |
| 199 | if (IS_ERR(twl->usb3v3)) |
| 200 | return -ENODEV; |
| 201 | |
| 202 | regulator_enable(twl->usb3v3); |
| 203 | |
| 204 | /* Program the VUSB_CFG_TRANS for ACTIVE state. */ |
| 205 | twl6030_writeb(twl, TWL_MODULE_PM_RECEIVER, 0x3F, |
| 206 | VUSB_CFG_TRANS); |
| 207 | |
| 208 | /* Program the VUSB_CFG_STATE register to ON on all groups. */ |
| 209 | twl6030_writeb(twl, TWL_MODULE_PM_RECEIVER, 0xE1, |
| 210 | VUSB_CFG_STATE); |
| 211 | |
| 212 | /* Program the USB_VBUS_CTRL_SET and set VBUS_ACT_COMP bit */ |
| 213 | twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET); |
| 214 | |
| 215 | /* |
| 216 | * Program the USB_ID_CTRL_SET register to enable GND drive |
| 217 | * and the ID comparators |
| 218 | */ |
| 219 | twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET); |
| 220 | |
| 221 | return 0; |
| 222 | } |
| 223 | |
| 224 | static ssize_t twl6030_usb_vbus_show(struct device *dev, |
| 225 | struct device_attribute *attr, char *buf) |
| 226 | { |
| 227 | struct twl6030_usb *twl = dev_get_drvdata(dev); |
| 228 | unsigned long flags; |
| 229 | int ret = -EINVAL; |
| 230 | |
| 231 | spin_lock_irqsave(&twl->lock, flags); |
| 232 | |
| 233 | switch (twl->linkstat) { |
| 234 | case USB_EVENT_VBUS: |
| 235 | ret = snprintf(buf, PAGE_SIZE, "vbus\n"); |
| 236 | break; |
| 237 | case USB_EVENT_ID: |
| 238 | ret = snprintf(buf, PAGE_SIZE, "id\n"); |
| 239 | break; |
| 240 | case USB_EVENT_NONE: |
| 241 | ret = snprintf(buf, PAGE_SIZE, "none\n"); |
| 242 | break; |
| 243 | default: |
| 244 | ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n"); |
| 245 | } |
| 246 | spin_unlock_irqrestore(&twl->lock, flags); |
| 247 | |
| 248 | return ret; |
| 249 | } |
| 250 | static DEVICE_ATTR(vbus, 0444, twl6030_usb_vbus_show, NULL); |
| 251 | |
| 252 | static irqreturn_t twl6030_usb_irq(int irq, void *_twl) |
| 253 | { |
| 254 | struct twl6030_usb *twl = _twl; |
| 255 | int status; |
| 256 | u8 vbus_state, hw_state; |
| 257 | |
| 258 | hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS); |
| 259 | |
| 260 | vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE, |
| 261 | CONTROLLER_STAT1); |
| 262 | if (!(hw_state & STS_USB_ID)) { |
| 263 | if (vbus_state & VBUS_DET) { |
| 264 | status = USB_EVENT_VBUS; |
| 265 | twl->otg.default_a = false; |
| 266 | twl->otg.state = OTG_STATE_B_IDLE; |
| 267 | } else { |
| 268 | status = USB_EVENT_NONE; |
| 269 | } |
| 270 | if (status >= 0) { |
| 271 | twl->linkstat = status; |
| 272 | blocking_notifier_call_chain(&twl->otg.notifier, |
| 273 | status, twl->otg.gadget); |
| 274 | } |
| 275 | } |
| 276 | sysfs_notify(&twl->dev->kobj, NULL, "vbus"); |
| 277 | |
| 278 | return IRQ_HANDLED; |
| 279 | } |
| 280 | |
| 281 | static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl) |
| 282 | { |
| 283 | struct twl6030_usb *twl = _twl; |
| 284 | int status = USB_EVENT_NONE; |
| 285 | u8 hw_state; |
| 286 | |
| 287 | hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS); |
| 288 | |
| 289 | if (hw_state & STS_USB_ID) { |
| 290 | |
| 291 | twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_CLR, 0x1); |
| 292 | twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET, |
| 293 | 0x10); |
| 294 | status = USB_EVENT_ID; |
| 295 | twl->otg.default_a = true; |
| 296 | twl->otg.state = OTG_STATE_A_IDLE; |
| 297 | blocking_notifier_call_chain(&twl->otg.notifier, status, |
| 298 | twl->otg.gadget); |
| 299 | } else { |
| 300 | twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_CLR, |
| 301 | 0x10); |
| 302 | twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET, |
| 303 | 0x1); |
| 304 | } |
| 305 | twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_LATCH_CLR, status); |
| 306 | twl->linkstat = status; |
| 307 | |
| 308 | return IRQ_HANDLED; |
| 309 | } |
| 310 | |
| 311 | static int twl6030_set_peripheral(struct otg_transceiver *x, |
| 312 | struct usb_gadget *gadget) |
| 313 | { |
| 314 | struct twl6030_usb *twl; |
| 315 | |
| 316 | if (!x) |
| 317 | return -ENODEV; |
| 318 | |
| 319 | twl = xceiv_to_twl(x); |
| 320 | twl->otg.gadget = gadget; |
| 321 | if (!gadget) |
| 322 | twl->otg.state = OTG_STATE_UNDEFINED; |
| 323 | |
| 324 | return 0; |
| 325 | } |
| 326 | |
| 327 | static int twl6030_enable_irq(struct otg_transceiver *x) |
| 328 | { |
| 329 | struct twl6030_usb *twl = xceiv_to_twl(x); |
| 330 | |
| 331 | twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET, 0x1); |
| 332 | twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C); |
| 333 | twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C); |
| 334 | |
| 335 | twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK, |
| 336 | REG_INT_MSK_LINE_C); |
| 337 | twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK, |
| 338 | REG_INT_MSK_STS_C); |
| 339 | twl6030_usb_irq(twl->irq2, twl); |
| 340 | twl6030_usbotg_irq(twl->irq1, twl); |
| 341 | |
| 342 | return 0; |
| 343 | } |
| 344 | |
| 345 | static int twl6030_set_vbus(struct otg_transceiver *x, bool enabled) |
| 346 | { |
| 347 | struct twl6030_usb *twl = xceiv_to_twl(x); |
| 348 | |
| 349 | /* |
| 350 | * Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1 |
| 351 | * register. This enables boost mode. |
| 352 | */ |
| 353 | if (enabled) |
| 354 | twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x40, |
| 355 | CHARGERUSB_CTRL1); |
| 356 | else |
| 357 | twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x00, |
| 358 | CHARGERUSB_CTRL1); |
| 359 | return 0; |
| 360 | } |
| 361 | |
| 362 | static int twl6030_set_host(struct otg_transceiver *x, struct usb_bus *host) |
| 363 | { |
| 364 | struct twl6030_usb *twl; |
| 365 | |
| 366 | if (!x) |
| 367 | return -ENODEV; |
| 368 | |
| 369 | twl = xceiv_to_twl(x); |
| 370 | twl->otg.host = host; |
| 371 | if (!host) |
| 372 | twl->otg.state = OTG_STATE_UNDEFINED; |
| 373 | return 0; |
| 374 | } |
| 375 | |
| 376 | static int __devinit twl6030_usb_probe(struct platform_device *pdev) |
| 377 | { |
| 378 | struct twl6030_usb *twl; |
| 379 | int status, err; |
| 380 | struct twl4030_usb_data *pdata; |
| 381 | struct device *dev = &pdev->dev; |
| 382 | pdata = dev->platform_data; |
| 383 | |
| 384 | twl = kzalloc(sizeof *twl, GFP_KERNEL); |
| 385 | if (!twl) |
| 386 | return -ENOMEM; |
| 387 | |
| 388 | twl->dev = &pdev->dev; |
| 389 | twl->irq1 = platform_get_irq(pdev, 0); |
| 390 | twl->irq2 = platform_get_irq(pdev, 1); |
| 391 | twl->otg.dev = twl->dev; |
| 392 | twl->otg.label = "twl6030"; |
| 393 | twl->otg.set_host = twl6030_set_host; |
| 394 | twl->otg.set_peripheral = twl6030_set_peripheral; |
| 395 | twl->otg.set_vbus = twl6030_set_vbus; |
| 396 | twl->otg.init = twl6030_phy_init; |
| 397 | twl->otg.shutdown = twl6030_phy_shutdown; |
| 398 | |
| 399 | /* init spinlock for workqueue */ |
| 400 | spin_lock_init(&twl->lock); |
| 401 | |
| 402 | err = twl6030_usb_ldo_init(twl); |
| 403 | if (err) { |
| 404 | dev_err(&pdev->dev, "ldo init failed\n"); |
| 405 | kfree(twl); |
| 406 | return err; |
| 407 | } |
| 408 | otg_set_transceiver(&twl->otg); |
| 409 | |
| 410 | platform_set_drvdata(pdev, twl); |
| 411 | if (device_create_file(&pdev->dev, &dev_attr_vbus)) |
| 412 | dev_warn(&pdev->dev, "could not create sysfs file\n"); |
| 413 | |
| 414 | BLOCKING_INIT_NOTIFIER_HEAD(&twl->otg.notifier); |
| 415 | |
| 416 | twl->irq_enabled = true; |
| 417 | status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq, |
| 418 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, |
| 419 | "twl6030_usb", twl); |
| 420 | if (status < 0) { |
| 421 | dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", |
| 422 | twl->irq1, status); |
| 423 | device_remove_file(twl->dev, &dev_attr_vbus); |
| 424 | kfree(twl); |
| 425 | return status; |
| 426 | } |
| 427 | |
| 428 | status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq, |
| 429 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, |
| 430 | "twl6030_usb", twl); |
| 431 | if (status < 0) { |
| 432 | dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", |
| 433 | twl->irq2, status); |
| 434 | free_irq(twl->irq1, twl); |
| 435 | device_remove_file(twl->dev, &dev_attr_vbus); |
| 436 | kfree(twl); |
| 437 | return status; |
| 438 | } |
| 439 | |
| 440 | pdata->phy_init(dev); |
| 441 | twl6030_enable_irq(&twl->otg); |
| 442 | dev_info(&pdev->dev, "Initialized TWL6030 USB module\n"); |
| 443 | |
| 444 | return 0; |
| 445 | } |
| 446 | |
| 447 | static int __exit twl6030_usb_remove(struct platform_device *pdev) |
| 448 | { |
| 449 | struct twl6030_usb *twl = platform_get_drvdata(pdev); |
| 450 | |
| 451 | struct twl4030_usb_data *pdata; |
| 452 | struct device *dev = &pdev->dev; |
| 453 | pdata = dev->platform_data; |
| 454 | |
| 455 | twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK, |
| 456 | REG_INT_MSK_LINE_C); |
| 457 | twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK, |
| 458 | REG_INT_MSK_STS_C); |
| 459 | free_irq(twl->irq1, twl); |
| 460 | free_irq(twl->irq2, twl); |
| 461 | regulator_put(twl->usb3v3); |
| 462 | pdata->phy_exit(twl->dev); |
| 463 | device_remove_file(twl->dev, &dev_attr_vbus); |
| 464 | kfree(twl); |
| 465 | |
| 466 | return 0; |
| 467 | } |
| 468 | |
| 469 | static struct platform_driver twl6030_usb_driver = { |
| 470 | .probe = twl6030_usb_probe, |
| 471 | .remove = __exit_p(twl6030_usb_remove), |
| 472 | .driver = { |
| 473 | .name = "twl6030_usb", |
| 474 | .owner = THIS_MODULE, |
| 475 | }, |
| 476 | }; |
| 477 | |
| 478 | static int __init twl6030_usb_init(void) |
| 479 | { |
| 480 | return platform_driver_register(&twl6030_usb_driver); |
| 481 | } |
| 482 | subsys_initcall(twl6030_usb_init); |
| 483 | |
| 484 | static void __exit twl6030_usb_exit(void) |
| 485 | { |
| 486 | platform_driver_unregister(&twl6030_usb_driver); |
| 487 | } |
| 488 | module_exit(twl6030_usb_exit); |
| 489 | |
| 490 | MODULE_ALIAS("platform:twl6030_usb"); |
| 491 | MODULE_AUTHOR("Hema HK <hemahk@ti.com>"); |
| 492 | MODULE_DESCRIPTION("TWL6030 USB transceiver driver"); |
| 493 | MODULE_LICENSE("GPL"); |