Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Motorola CPCAP PMIC USB PHY driver |
| 3 | * Copyright (C) 2017 Tony Lindgren <tony@atomide.com> |
| 4 | * |
| 5 | * Some parts based on earlier Motorola Linux kernel tree code in |
| 6 | * board-mapphone-usb.c and cpcap-usb-det.c: |
| 7 | * Copyright (C) 2007 - 2011 Motorola, Inc. |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License as |
| 11 | * published by the Free Software Foundation version 2. |
| 12 | * |
| 13 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any |
| 14 | * kind, whether express or implied; without even the implied warranty |
| 15 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/atomic.h> |
| 20 | #include <linux/clk.h> |
| 21 | #include <linux/delay.h> |
| 22 | #include <linux/err.h> |
| 23 | #include <linux/io.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/of.h> |
| 26 | #include <linux/of_platform.h> |
| 27 | #include <linux/iio/consumer.h> |
| 28 | #include <linux/pinctrl/consumer.h> |
| 29 | #include <linux/platform_device.h> |
| 30 | #include <linux/regmap.h> |
| 31 | #include <linux/slab.h> |
| 32 | |
| 33 | #include <linux/gpio/consumer.h> |
| 34 | #include <linux/mfd/motorola-cpcap.h> |
| 35 | #include <linux/phy/omap_usb.h> |
| 36 | #include <linux/phy/phy.h> |
| 37 | #include <linux/regulator/consumer.h> |
| 38 | #include <linux/usb/musb.h> |
| 39 | |
| 40 | /* CPCAP_REG_USBC1 register bits */ |
| 41 | #define CPCAP_BIT_IDPULSE BIT(15) |
| 42 | #define CPCAP_BIT_ID100KPU BIT(14) |
| 43 | #define CPCAP_BIT_IDPUCNTRL BIT(13) |
| 44 | #define CPCAP_BIT_IDPU BIT(12) |
| 45 | #define CPCAP_BIT_IDPD BIT(11) |
| 46 | #define CPCAP_BIT_VBUSCHRGTMR3 BIT(10) |
| 47 | #define CPCAP_BIT_VBUSCHRGTMR2 BIT(9) |
| 48 | #define CPCAP_BIT_VBUSCHRGTMR1 BIT(8) |
| 49 | #define CPCAP_BIT_VBUSCHRGTMR0 BIT(7) |
| 50 | #define CPCAP_BIT_VBUSPU BIT(6) |
| 51 | #define CPCAP_BIT_VBUSPD BIT(5) |
| 52 | #define CPCAP_BIT_DMPD BIT(4) |
| 53 | #define CPCAP_BIT_DPPD BIT(3) |
| 54 | #define CPCAP_BIT_DM1K5PU BIT(2) |
| 55 | #define CPCAP_BIT_DP1K5PU BIT(1) |
| 56 | #define CPCAP_BIT_DP150KPU BIT(0) |
| 57 | |
| 58 | /* CPCAP_REG_USBC2 register bits */ |
| 59 | #define CPCAP_BIT_ZHSDRV1 BIT(15) |
| 60 | #define CPCAP_BIT_ZHSDRV0 BIT(14) |
| 61 | #define CPCAP_BIT_DPLLCLKREQ BIT(13) |
| 62 | #define CPCAP_BIT_SE0CONN BIT(12) |
| 63 | #define CPCAP_BIT_UARTTXTRI BIT(11) |
| 64 | #define CPCAP_BIT_UARTSWAP BIT(10) |
| 65 | #define CPCAP_BIT_UARTMUX1 BIT(9) |
| 66 | #define CPCAP_BIT_UARTMUX0 BIT(8) |
| 67 | #define CPCAP_BIT_ULPISTPLOW BIT(7) |
| 68 | #define CPCAP_BIT_TXENPOL BIT(6) |
| 69 | #define CPCAP_BIT_USBXCVREN BIT(5) |
| 70 | #define CPCAP_BIT_USBCNTRL BIT(4) |
| 71 | #define CPCAP_BIT_USBSUSPEND BIT(3) |
| 72 | #define CPCAP_BIT_EMUMODE2 BIT(2) |
| 73 | #define CPCAP_BIT_EMUMODE1 BIT(1) |
| 74 | #define CPCAP_BIT_EMUMODE0 BIT(0) |
| 75 | |
| 76 | /* CPCAP_REG_USBC3 register bits */ |
| 77 | #define CPCAP_BIT_SPARE_898_15 BIT(15) |
| 78 | #define CPCAP_BIT_IHSTX03 BIT(14) |
| 79 | #define CPCAP_BIT_IHSTX02 BIT(13) |
| 80 | #define CPCAP_BIT_IHSTX01 BIT(12) |
| 81 | #define CPCAP_BIT_IHSTX0 BIT(11) |
| 82 | #define CPCAP_BIT_IDPU_SPI BIT(10) |
| 83 | #define CPCAP_BIT_UNUSED_898_9 BIT(9) |
| 84 | #define CPCAP_BIT_VBUSSTBY_EN BIT(8) |
| 85 | #define CPCAP_BIT_VBUSEN_SPI BIT(7) |
| 86 | #define CPCAP_BIT_VBUSPU_SPI BIT(6) |
| 87 | #define CPCAP_BIT_VBUSPD_SPI BIT(5) |
| 88 | #define CPCAP_BIT_DMPD_SPI BIT(4) |
| 89 | #define CPCAP_BIT_DPPD_SPI BIT(3) |
| 90 | #define CPCAP_BIT_SUSPEND_SPI BIT(2) |
| 91 | #define CPCAP_BIT_PU_SPI BIT(1) |
| 92 | #define CPCAP_BIT_ULPI_SPI_SEL BIT(0) |
| 93 | |
| 94 | struct cpcap_usb_ints_state { |
| 95 | bool id_ground; |
| 96 | bool id_float; |
| 97 | bool chrg_det; |
| 98 | bool rvrs_chrg; |
| 99 | bool vbusov; |
| 100 | |
| 101 | bool chrg_se1b; |
| 102 | bool se0conn; |
| 103 | bool rvrs_mode; |
| 104 | bool chrgcurr1; |
| 105 | bool vbusvld; |
| 106 | bool sessvld; |
| 107 | bool sessend; |
| 108 | bool se1; |
| 109 | |
| 110 | bool battdetb; |
| 111 | bool dm; |
| 112 | bool dp; |
| 113 | }; |
| 114 | |
| 115 | enum cpcap_gpio_mode { |
| 116 | CPCAP_DM_DP, |
| 117 | CPCAP_MDM_RX_TX, |
Tony Lindgren | 63078b6 | 2019-12-22 10:17:02 -0800 | [diff] [blame] | 118 | CPCAP_UNKNOWN_DISABLED, /* Seems to disable USB lines */ |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 119 | CPCAP_OTG_DM_DP, |
| 120 | }; |
| 121 | |
| 122 | struct cpcap_phy_ddata { |
| 123 | struct regmap *reg; |
| 124 | struct device *dev; |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 125 | struct usb_phy phy; |
| 126 | struct delayed_work detect_work; |
| 127 | struct pinctrl *pins; |
| 128 | struct pinctrl_state *pins_ulpi; |
| 129 | struct pinctrl_state *pins_utmi; |
| 130 | struct pinctrl_state *pins_uart; |
| 131 | struct gpio_desc *gpio[2]; |
| 132 | struct iio_channel *vbus; |
| 133 | struct iio_channel *id; |
| 134 | struct regulator *vusb; |
| 135 | atomic_t active; |
Tony Lindgren | 9492535 | 2019-12-22 10:17:03 -0800 | [diff] [blame] | 136 | unsigned int vbus_provider:1; |
| 137 | unsigned int docked:1; |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 138 | }; |
| 139 | |
| 140 | static bool cpcap_usb_vbus_valid(struct cpcap_phy_ddata *ddata) |
| 141 | { |
| 142 | int error, value = 0; |
| 143 | |
| 144 | error = iio_read_channel_processed(ddata->vbus, &value); |
| 145 | if (error >= 0) |
Yang Li | d68f2cb | 2021-01-29 15:38:35 +0800 | [diff] [blame] | 146 | return value > 3900; |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 147 | |
| 148 | dev_err(ddata->dev, "error reading VBUS: %i\n", error); |
| 149 | |
| 150 | return false; |
| 151 | } |
| 152 | |
| 153 | static int cpcap_usb_phy_set_host(struct usb_otg *otg, struct usb_bus *host) |
| 154 | { |
| 155 | otg->host = host; |
| 156 | if (!host) |
| 157 | otg->state = OTG_STATE_UNDEFINED; |
| 158 | |
| 159 | return 0; |
| 160 | } |
| 161 | |
| 162 | static int cpcap_usb_phy_set_peripheral(struct usb_otg *otg, |
| 163 | struct usb_gadget *gadget) |
| 164 | { |
| 165 | otg->gadget = gadget; |
| 166 | if (!gadget) |
| 167 | otg->state = OTG_STATE_UNDEFINED; |
| 168 | |
| 169 | return 0; |
| 170 | } |
| 171 | |
| 172 | static const struct phy_ops ops = { |
| 173 | .owner = THIS_MODULE, |
| 174 | }; |
| 175 | |
| 176 | static int cpcap_phy_get_ints_state(struct cpcap_phy_ddata *ddata, |
| 177 | struct cpcap_usb_ints_state *s) |
| 178 | { |
| 179 | int val, error; |
| 180 | |
| 181 | error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val); |
| 182 | if (error) |
| 183 | return error; |
| 184 | |
| 185 | s->id_ground = val & BIT(15); |
| 186 | s->id_float = val & BIT(14); |
| 187 | s->vbusov = val & BIT(11); |
| 188 | |
| 189 | error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val); |
| 190 | if (error) |
| 191 | return error; |
| 192 | |
| 193 | s->vbusvld = val & BIT(3); |
| 194 | s->sessvld = val & BIT(2); |
| 195 | s->sessend = val & BIT(1); |
| 196 | s->se1 = val & BIT(0); |
| 197 | |
| 198 | error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val); |
| 199 | if (error) |
| 200 | return error; |
| 201 | |
| 202 | s->dm = val & BIT(1); |
| 203 | s->dp = val & BIT(0); |
| 204 | |
| 205 | return 0; |
| 206 | } |
| 207 | |
| 208 | static int cpcap_usb_set_uart_mode(struct cpcap_phy_ddata *ddata); |
| 209 | static int cpcap_usb_set_usb_mode(struct cpcap_phy_ddata *ddata); |
| 210 | |
Tony Lindgren | 4acb020 | 2019-12-20 16:21:40 +0530 | [diff] [blame] | 211 | static void cpcap_usb_try_musb_mailbox(struct cpcap_phy_ddata *ddata, |
| 212 | enum musb_vbus_id_status status) |
| 213 | { |
| 214 | int error; |
| 215 | |
| 216 | error = musb_mailbox(status); |
| 217 | if (!error) |
| 218 | return; |
| 219 | |
| 220 | dev_dbg(ddata->dev, "%s: musb_mailbox failed: %i\n", |
| 221 | __func__, error); |
| 222 | } |
| 223 | |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 224 | static void cpcap_usb_detect(struct work_struct *work) |
| 225 | { |
| 226 | struct cpcap_phy_ddata *ddata; |
| 227 | struct cpcap_usb_ints_state s; |
| 228 | bool vbus = false; |
| 229 | int error; |
| 230 | |
| 231 | ddata = container_of(work, struct cpcap_phy_ddata, detect_work.work); |
| 232 | |
| 233 | error = cpcap_phy_get_ints_state(ddata, &s); |
| 234 | if (error) |
| 235 | return; |
| 236 | |
Tony Lindgren | 9492535 | 2019-12-22 10:17:03 -0800 | [diff] [blame] | 237 | vbus = cpcap_usb_vbus_valid(ddata); |
| 238 | |
| 239 | /* We need to kick the VBUS as USB A-host */ |
| 240 | if (s.id_ground && ddata->vbus_provider) { |
| 241 | dev_dbg(ddata->dev, "still in USB A-host mode, kicking VBUS\n"); |
| 242 | |
| 243 | cpcap_usb_try_musb_mailbox(ddata, MUSB_ID_GROUND); |
| 244 | |
| 245 | error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3, |
| 246 | CPCAP_BIT_VBUSSTBY_EN | |
| 247 | CPCAP_BIT_VBUSEN_SPI, |
| 248 | CPCAP_BIT_VBUSEN_SPI); |
| 249 | if (error) |
| 250 | goto out_err; |
| 251 | |
| 252 | return; |
| 253 | } |
| 254 | |
| 255 | if (vbus && s.id_ground && ddata->docked) { |
| 256 | dev_dbg(ddata->dev, "still docked as A-host, signal ID down\n"); |
| 257 | |
| 258 | cpcap_usb_try_musb_mailbox(ddata, MUSB_ID_GROUND); |
| 259 | |
| 260 | return; |
| 261 | } |
| 262 | |
| 263 | /* No VBUS needed with docks */ |
| 264 | if (vbus && s.id_ground && !ddata->vbus_provider) { |
| 265 | dev_dbg(ddata->dev, "connected to a dock\n"); |
| 266 | |
| 267 | ddata->docked = true; |
| 268 | |
| 269 | error = cpcap_usb_set_usb_mode(ddata); |
| 270 | if (error) |
| 271 | goto out_err; |
| 272 | |
| 273 | cpcap_usb_try_musb_mailbox(ddata, MUSB_ID_GROUND); |
| 274 | |
| 275 | /* |
| 276 | * Force check state again after musb has reoriented, |
| 277 | * otherwise devices won't enumerate after loading PHY |
| 278 | * driver. |
| 279 | */ |
| 280 | schedule_delayed_work(&ddata->detect_work, |
| 281 | msecs_to_jiffies(1000)); |
| 282 | |
| 283 | return; |
| 284 | } |
| 285 | |
| 286 | if (s.id_ground && !ddata->docked) { |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 287 | dev_dbg(ddata->dev, "id ground, USB host mode\n"); |
Tony Lindgren | 9492535 | 2019-12-22 10:17:03 -0800 | [diff] [blame] | 288 | |
| 289 | ddata->vbus_provider = true; |
| 290 | |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 291 | error = cpcap_usb_set_usb_mode(ddata); |
| 292 | if (error) |
| 293 | goto out_err; |
| 294 | |
Tony Lindgren | 4acb020 | 2019-12-20 16:21:40 +0530 | [diff] [blame] | 295 | cpcap_usb_try_musb_mailbox(ddata, MUSB_ID_GROUND); |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 296 | |
| 297 | error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3, |
Tony Lindgren | 7f73786 | 2019-08-30 16:23:16 -0700 | [diff] [blame] | 298 | CPCAP_BIT_VBUSSTBY_EN | |
| 299 | CPCAP_BIT_VBUSEN_SPI, |
| 300 | CPCAP_BIT_VBUSEN_SPI); |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 301 | if (error) |
| 302 | goto out_err; |
| 303 | |
| 304 | return; |
| 305 | } |
| 306 | |
| 307 | error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3, |
Tony Lindgren | 7f73786 | 2019-08-30 16:23:16 -0700 | [diff] [blame] | 308 | CPCAP_BIT_VBUSSTBY_EN | |
| 309 | CPCAP_BIT_VBUSEN_SPI, 0); |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 310 | if (error) |
| 311 | goto out_err; |
| 312 | |
| 313 | vbus = cpcap_usb_vbus_valid(ddata); |
| 314 | |
Tony Lindgren | 9492535 | 2019-12-22 10:17:03 -0800 | [diff] [blame] | 315 | /* Otherwise assume we're connected to a USB host */ |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 316 | if (vbus) { |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 317 | dev_dbg(ddata->dev, "connected to USB host\n"); |
| 318 | error = cpcap_usb_set_usb_mode(ddata); |
| 319 | if (error) |
| 320 | goto out_err; |
Tony Lindgren | 4acb020 | 2019-12-20 16:21:40 +0530 | [diff] [blame] | 321 | cpcap_usb_try_musb_mailbox(ddata, MUSB_VBUS_VALID); |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 322 | |
| 323 | return; |
| 324 | } |
| 325 | |
Tony Lindgren | 9492535 | 2019-12-22 10:17:03 -0800 | [diff] [blame] | 326 | ddata->vbus_provider = false; |
| 327 | ddata->docked = false; |
Tony Lindgren | 049226b | 2019-12-22 10:00:19 -0800 | [diff] [blame] | 328 | cpcap_usb_try_musb_mailbox(ddata, MUSB_VBUS_OFF); |
| 329 | |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 330 | /* Default to debug UART mode */ |
| 331 | error = cpcap_usb_set_uart_mode(ddata); |
| 332 | if (error) |
| 333 | goto out_err; |
| 334 | |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 335 | dev_dbg(ddata->dev, "set UART mode\n"); |
| 336 | |
| 337 | return; |
| 338 | |
| 339 | out_err: |
| 340 | dev_err(ddata->dev, "error setting cable state: %i\n", error); |
| 341 | } |
| 342 | |
| 343 | static irqreturn_t cpcap_phy_irq_thread(int irq, void *data) |
| 344 | { |
| 345 | struct cpcap_phy_ddata *ddata = data; |
| 346 | |
| 347 | if (!atomic_read(&ddata->active)) |
| 348 | return IRQ_NONE; |
| 349 | |
| 350 | schedule_delayed_work(&ddata->detect_work, msecs_to_jiffies(1)); |
| 351 | |
| 352 | return IRQ_HANDLED; |
| 353 | } |
| 354 | |
| 355 | static int cpcap_usb_init_irq(struct platform_device *pdev, |
| 356 | struct cpcap_phy_ddata *ddata, |
| 357 | const char *name) |
| 358 | { |
| 359 | int irq, error; |
| 360 | |
| 361 | irq = platform_get_irq_byname(pdev, name); |
Arvind Yadav | e796cc6 | 2017-11-17 16:55:35 +0530 | [diff] [blame] | 362 | if (irq < 0) |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 363 | return -ENODEV; |
| 364 | |
| 365 | error = devm_request_threaded_irq(ddata->dev, irq, NULL, |
| 366 | cpcap_phy_irq_thread, |
Zou Wei | 25d76fe | 2020-10-28 16:59:09 +0800 | [diff] [blame] | 367 | IRQF_SHARED | |
| 368 | IRQF_ONESHOT, |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 369 | name, ddata); |
| 370 | if (error) { |
| 371 | dev_err(ddata->dev, "could not get irq %s: %i\n", |
| 372 | name, error); |
| 373 | |
| 374 | return error; |
| 375 | } |
| 376 | |
| 377 | return 0; |
| 378 | } |
| 379 | |
| 380 | static const char * const cpcap_phy_irqs[] = { |
| 381 | /* REG_INT_0 */ |
| 382 | "id_ground", "id_float", |
| 383 | |
| 384 | /* REG_INT1 */ |
| 385 | "se0conn", "vbusvld", "sessvld", "sessend", "se1", |
| 386 | |
| 387 | /* REG_INT_3 */ |
| 388 | "dm", "dp", |
| 389 | }; |
| 390 | |
| 391 | static int cpcap_usb_init_interrupts(struct platform_device *pdev, |
| 392 | struct cpcap_phy_ddata *ddata) |
| 393 | { |
| 394 | int i, error; |
| 395 | |
| 396 | for (i = 0; i < ARRAY_SIZE(cpcap_phy_irqs); i++) { |
| 397 | error = cpcap_usb_init_irq(pdev, ddata, cpcap_phy_irqs[i]); |
| 398 | if (error) |
| 399 | return error; |
| 400 | } |
| 401 | |
| 402 | return 0; |
| 403 | } |
| 404 | |
| 405 | /* |
| 406 | * Optional pins and modes. At least Motorola mapphone devices |
| 407 | * are using two GPIOs and dynamic pinctrl to multiplex PHY pins |
| 408 | * to UART, ULPI or UTMI mode. |
| 409 | */ |
| 410 | |
| 411 | static int cpcap_usb_gpio_set_mode(struct cpcap_phy_ddata *ddata, |
| 412 | enum cpcap_gpio_mode mode) |
| 413 | { |
| 414 | if (!ddata->gpio[0] || !ddata->gpio[1]) |
| 415 | return 0; |
| 416 | |
| 417 | gpiod_set_value(ddata->gpio[0], mode & 1); |
| 418 | gpiod_set_value(ddata->gpio[1], mode >> 1); |
| 419 | |
| 420 | return 0; |
| 421 | } |
| 422 | |
| 423 | static int cpcap_usb_set_uart_mode(struct cpcap_phy_ddata *ddata) |
| 424 | { |
| 425 | int error; |
| 426 | |
Tony Lindgren | 63078b6 | 2019-12-22 10:17:02 -0800 | [diff] [blame] | 427 | /* Disable lines to prevent glitches from waking up mdm6600 */ |
| 428 | error = cpcap_usb_gpio_set_mode(ddata, CPCAP_UNKNOWN_DISABLED); |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 429 | if (error) |
| 430 | goto out_err; |
| 431 | |
| 432 | if (ddata->pins_uart) { |
| 433 | error = pinctrl_select_state(ddata->pins, ddata->pins_uart); |
| 434 | if (error) |
| 435 | goto out_err; |
| 436 | } |
| 437 | |
| 438 | error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC1, |
| 439 | CPCAP_BIT_VBUSPD, |
| 440 | CPCAP_BIT_VBUSPD); |
| 441 | if (error) |
| 442 | goto out_err; |
| 443 | |
| 444 | error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC2, |
| 445 | 0xffff, CPCAP_BIT_UARTMUX0 | |
| 446 | CPCAP_BIT_EMUMODE0); |
| 447 | if (error) |
| 448 | goto out_err; |
| 449 | |
| 450 | error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3, 0x7fff, |
| 451 | CPCAP_BIT_IDPU_SPI); |
| 452 | if (error) |
| 453 | goto out_err; |
| 454 | |
Tony Lindgren | 63078b6 | 2019-12-22 10:17:02 -0800 | [diff] [blame] | 455 | /* Enable UART mode */ |
| 456 | error = cpcap_usb_gpio_set_mode(ddata, CPCAP_DM_DP); |
| 457 | if (error) |
| 458 | goto out_err; |
| 459 | |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 460 | return 0; |
| 461 | |
| 462 | out_err: |
| 463 | dev_err(ddata->dev, "%s failed with %i\n", __func__, error); |
| 464 | |
| 465 | return error; |
| 466 | } |
| 467 | |
| 468 | static int cpcap_usb_set_usb_mode(struct cpcap_phy_ddata *ddata) |
| 469 | { |
| 470 | int error; |
| 471 | |
Tony Lindgren | 63078b6 | 2019-12-22 10:17:02 -0800 | [diff] [blame] | 472 | /* Disable lines to prevent glitches from waking up mdm6600 */ |
| 473 | error = cpcap_usb_gpio_set_mode(ddata, CPCAP_UNKNOWN_DISABLED); |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 474 | if (error) |
| 475 | return error; |
| 476 | |
| 477 | if (ddata->pins_utmi) { |
| 478 | error = pinctrl_select_state(ddata->pins, ddata->pins_utmi); |
| 479 | if (error) { |
| 480 | dev_err(ddata->dev, "could not set usb mode: %i\n", |
| 481 | error); |
| 482 | |
| 483 | return error; |
| 484 | } |
| 485 | } |
| 486 | |
| 487 | error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC1, |
| 488 | CPCAP_BIT_VBUSPD, 0); |
| 489 | if (error) |
| 490 | goto out_err; |
| 491 | |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 492 | error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3, |
| 493 | CPCAP_BIT_PU_SPI | |
| 494 | CPCAP_BIT_DMPD_SPI | |
| 495 | CPCAP_BIT_DPPD_SPI | |
| 496 | CPCAP_BIT_SUSPEND_SPI | |
| 497 | CPCAP_BIT_ULPI_SPI_SEL, 0); |
| 498 | if (error) |
| 499 | goto out_err; |
| 500 | |
| 501 | error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC2, |
| 502 | CPCAP_BIT_USBXCVREN, |
| 503 | CPCAP_BIT_USBXCVREN); |
| 504 | if (error) |
| 505 | goto out_err; |
| 506 | |
Tony Lindgren | 63078b6 | 2019-12-22 10:17:02 -0800 | [diff] [blame] | 507 | /* Enable USB mode */ |
| 508 | error = cpcap_usb_gpio_set_mode(ddata, CPCAP_OTG_DM_DP); |
| 509 | if (error) |
| 510 | goto out_err; |
| 511 | |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 512 | return 0; |
| 513 | |
| 514 | out_err: |
| 515 | dev_err(ddata->dev, "%s failed with %i\n", __func__, error); |
| 516 | |
| 517 | return error; |
| 518 | } |
| 519 | |
| 520 | static int cpcap_usb_init_optional_pins(struct cpcap_phy_ddata *ddata) |
| 521 | { |
| 522 | ddata->pins = devm_pinctrl_get(ddata->dev); |
| 523 | if (IS_ERR(ddata->pins)) { |
| 524 | dev_info(ddata->dev, "default pins not configured: %ld\n", |
| 525 | PTR_ERR(ddata->pins)); |
| 526 | ddata->pins = NULL; |
Tony Lindgren | 259a240 | 2017-06-12 01:12:23 -0700 | [diff] [blame] | 527 | |
| 528 | return 0; |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 529 | } |
| 530 | |
| 531 | ddata->pins_ulpi = pinctrl_lookup_state(ddata->pins, "ulpi"); |
| 532 | if (IS_ERR(ddata->pins_ulpi)) { |
| 533 | dev_info(ddata->dev, "ulpi pins not configured\n"); |
| 534 | ddata->pins_ulpi = NULL; |
| 535 | } |
| 536 | |
| 537 | ddata->pins_utmi = pinctrl_lookup_state(ddata->pins, "utmi"); |
| 538 | if (IS_ERR(ddata->pins_utmi)) { |
| 539 | dev_info(ddata->dev, "utmi pins not configured\n"); |
| 540 | ddata->pins_utmi = NULL; |
| 541 | } |
| 542 | |
| 543 | ddata->pins_uart = pinctrl_lookup_state(ddata->pins, "uart"); |
| 544 | if (IS_ERR(ddata->pins_uart)) { |
| 545 | dev_info(ddata->dev, "uart pins not configured\n"); |
| 546 | ddata->pins_uart = NULL; |
| 547 | } |
| 548 | |
| 549 | if (ddata->pins_uart) |
| 550 | return pinctrl_select_state(ddata->pins, ddata->pins_uart); |
| 551 | |
| 552 | return 0; |
| 553 | } |
| 554 | |
| 555 | static void cpcap_usb_init_optional_gpios(struct cpcap_phy_ddata *ddata) |
| 556 | { |
| 557 | int i; |
| 558 | |
| 559 | for (i = 0; i < 2; i++) { |
| 560 | ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode", |
| 561 | i, GPIOD_OUT_HIGH); |
| 562 | if (IS_ERR(ddata->gpio[i])) { |
| 563 | dev_info(ddata->dev, "no mode change GPIO%i: %li\n", |
| 564 | i, PTR_ERR(ddata->gpio[i])); |
Dan Carpenter | aea430e | 2017-06-28 15:19:37 +0300 | [diff] [blame] | 565 | ddata->gpio[i] = NULL; |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 566 | } |
| 567 | } |
| 568 | } |
| 569 | |
| 570 | static int cpcap_usb_init_iio(struct cpcap_phy_ddata *ddata) |
| 571 | { |
| 572 | enum iio_chan_type type; |
| 573 | int error; |
| 574 | |
| 575 | ddata->vbus = devm_iio_channel_get(ddata->dev, "vbus"); |
| 576 | if (IS_ERR(ddata->vbus)) { |
| 577 | error = PTR_ERR(ddata->vbus); |
| 578 | goto out_err; |
| 579 | } |
| 580 | |
| 581 | if (!ddata->vbus->indio_dev) { |
| 582 | error = -ENXIO; |
| 583 | goto out_err; |
| 584 | } |
| 585 | |
| 586 | error = iio_get_channel_type(ddata->vbus, &type); |
| 587 | if (error < 0) |
| 588 | goto out_err; |
| 589 | |
| 590 | if (type != IIO_VOLTAGE) { |
| 591 | error = -EINVAL; |
| 592 | goto out_err; |
| 593 | } |
| 594 | |
| 595 | return 0; |
| 596 | |
| 597 | out_err: |
| 598 | dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n", |
| 599 | error); |
| 600 | |
| 601 | return error; |
| 602 | } |
| 603 | |
| 604 | #ifdef CONFIG_OF |
| 605 | static const struct of_device_id cpcap_usb_phy_id_table[] = { |
| 606 | { |
| 607 | .compatible = "motorola,cpcap-usb-phy", |
| 608 | }, |
| 609 | { |
| 610 | .compatible = "motorola,mapphone-cpcap-usb-phy", |
| 611 | }, |
| 612 | {}, |
| 613 | }; |
| 614 | MODULE_DEVICE_TABLE(of, cpcap_usb_phy_id_table); |
| 615 | #endif |
| 616 | |
| 617 | static int cpcap_usb_phy_probe(struct platform_device *pdev) |
| 618 | { |
| 619 | struct cpcap_phy_ddata *ddata; |
| 620 | struct phy *generic_phy; |
| 621 | struct phy_provider *phy_provider; |
| 622 | struct usb_otg *otg; |
| 623 | const struct of_device_id *of_id; |
| 624 | int error; |
| 625 | |
| 626 | of_id = of_match_device(of_match_ptr(cpcap_usb_phy_id_table), |
| 627 | &pdev->dev); |
| 628 | if (!of_id) |
| 629 | return -EINVAL; |
| 630 | |
| 631 | ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL); |
| 632 | if (!ddata) |
| 633 | return -ENOMEM; |
| 634 | |
| 635 | ddata->reg = dev_get_regmap(pdev->dev.parent, NULL); |
| 636 | if (!ddata->reg) |
| 637 | return -ENODEV; |
| 638 | |
| 639 | otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL); |
| 640 | if (!otg) |
| 641 | return -ENOMEM; |
| 642 | |
| 643 | ddata->dev = &pdev->dev; |
| 644 | ddata->phy.dev = ddata->dev; |
| 645 | ddata->phy.label = "cpcap_usb_phy"; |
| 646 | ddata->phy.otg = otg; |
| 647 | ddata->phy.type = USB_PHY_TYPE_USB2; |
| 648 | otg->set_host = cpcap_usb_phy_set_host; |
| 649 | otg->set_peripheral = cpcap_usb_phy_set_peripheral; |
| 650 | otg->usb_phy = &ddata->phy; |
| 651 | INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect); |
| 652 | platform_set_drvdata(pdev, ddata); |
| 653 | |
| 654 | ddata->vusb = devm_regulator_get(&pdev->dev, "vusb"); |
| 655 | if (IS_ERR(ddata->vusb)) |
| 656 | return PTR_ERR(ddata->vusb); |
| 657 | |
| 658 | error = regulator_enable(ddata->vusb); |
| 659 | if (error) |
| 660 | return error; |
| 661 | |
| 662 | generic_phy = devm_phy_create(ddata->dev, NULL, &ops); |
| 663 | if (IS_ERR(generic_phy)) { |
| 664 | error = PTR_ERR(generic_phy); |
Tony Lindgren | 764257d | 2020-12-30 12:21:05 +0200 | [diff] [blame] | 665 | goto out_reg_disable; |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 666 | } |
| 667 | |
| 668 | phy_set_drvdata(generic_phy, ddata); |
| 669 | |
| 670 | phy_provider = devm_of_phy_provider_register(ddata->dev, |
| 671 | of_phy_simple_xlate); |
Tony Lindgren | 764257d | 2020-12-30 12:21:05 +0200 | [diff] [blame] | 672 | if (IS_ERR(phy_provider)) { |
| 673 | error = PTR_ERR(phy_provider); |
| 674 | goto out_reg_disable; |
| 675 | } |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 676 | |
| 677 | error = cpcap_usb_init_optional_pins(ddata); |
| 678 | if (error) |
Tony Lindgren | 764257d | 2020-12-30 12:21:05 +0200 | [diff] [blame] | 679 | goto out_reg_disable; |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 680 | |
| 681 | cpcap_usb_init_optional_gpios(ddata); |
| 682 | |
| 683 | error = cpcap_usb_init_iio(ddata); |
| 684 | if (error) |
Tony Lindgren | 764257d | 2020-12-30 12:21:05 +0200 | [diff] [blame] | 685 | goto out_reg_disable; |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 686 | |
| 687 | error = cpcap_usb_init_interrupts(pdev, ddata); |
| 688 | if (error) |
Tony Lindgren | 764257d | 2020-12-30 12:21:05 +0200 | [diff] [blame] | 689 | goto out_reg_disable; |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 690 | |
| 691 | usb_add_phy_dev(&ddata->phy); |
| 692 | atomic_set(&ddata->active, 1); |
| 693 | schedule_delayed_work(&ddata->detect_work, msecs_to_jiffies(1)); |
| 694 | |
| 695 | return 0; |
Tony Lindgren | 764257d | 2020-12-30 12:21:05 +0200 | [diff] [blame] | 696 | |
| 697 | out_reg_disable: |
| 698 | regulator_disable(ddata->vusb); |
| 699 | |
| 700 | return error; |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 701 | } |
| 702 | |
| 703 | static int cpcap_usb_phy_remove(struct platform_device *pdev) |
| 704 | { |
| 705 | struct cpcap_phy_ddata *ddata = platform_get_drvdata(pdev); |
| 706 | int error; |
| 707 | |
| 708 | atomic_set(&ddata->active, 0); |
| 709 | error = cpcap_usb_set_uart_mode(ddata); |
| 710 | if (error) |
| 711 | dev_err(ddata->dev, "could not set UART mode\n"); |
| 712 | |
Tony Lindgren | 4acb020 | 2019-12-20 16:21:40 +0530 | [diff] [blame] | 713 | cpcap_usb_try_musb_mailbox(ddata, MUSB_VBUS_OFF); |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 714 | |
| 715 | usb_remove_phy(&ddata->phy); |
| 716 | cancel_delayed_work_sync(&ddata->detect_work); |
Tony Lindgren | 6d6ce40f | 2017-05-22 17:37:23 -0700 | [diff] [blame] | 717 | regulator_disable(ddata->vusb); |
| 718 | |
| 719 | return 0; |
| 720 | } |
| 721 | |
| 722 | static struct platform_driver cpcap_usb_phy_driver = { |
| 723 | .probe = cpcap_usb_phy_probe, |
| 724 | .remove = cpcap_usb_phy_remove, |
| 725 | .driver = { |
| 726 | .name = "cpcap-usb-phy", |
| 727 | .of_match_table = of_match_ptr(cpcap_usb_phy_id_table), |
| 728 | }, |
| 729 | }; |
| 730 | |
| 731 | module_platform_driver(cpcap_usb_phy_driver); |
| 732 | |
| 733 | MODULE_ALIAS("platform:cpcap_usb"); |
| 734 | MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>"); |
| 735 | MODULE_DESCRIPTION("CPCAP usb phy driver"); |
| 736 | MODULE_LICENSE("GPL v2"); |