Ivan T. Ivanov | 3511699 | 2015-07-08 17:57:40 +0300 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2015, Linaro Limited |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 and |
| 6 | * only version 2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/clk.h> |
| 15 | #include <linux/delay.h> |
| 16 | #include <linux/device.h> |
| 17 | #include <linux/err.h> |
| 18 | #include <linux/extcon.h> |
| 19 | #include <linux/gpio/consumer.h> |
| 20 | #include <linux/io.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/of.h> |
| 23 | #include <linux/platform_device.h> |
| 24 | #include <linux/reboot.h> |
| 25 | #include <linux/regulator/consumer.h> |
| 26 | #include <linux/reset.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/usb.h> |
| 29 | #include <linux/usb/ulpi.h> |
| 30 | |
| 31 | #define HSPHY_AHBBURST 0x0090 |
| 32 | #define HSPHY_AHBMODE 0x0098 |
| 33 | #define HSPHY_GENCONFIG 0x009c |
| 34 | #define HSPHY_GENCONFIG_2 0x00a0 |
| 35 | |
| 36 | #define HSPHY_USBCMD 0x0140 |
| 37 | #define HSPHY_ULPI_VIEWPORT 0x0170 |
| 38 | #define HSPHY_CTRL 0x0240 |
| 39 | |
| 40 | #define HSPHY_TXFIFO_IDLE_FORCE_DIS BIT(4) |
| 41 | #define HSPHY_SESS_VLD_CTRL_EN BIT(7) |
| 42 | #define HSPHY_POR_ASSERT BIT(0) |
| 43 | #define HSPHY_RETEN BIT(1) |
| 44 | |
| 45 | #define HSPHY_SESS_VLD_CTRL BIT(25) |
| 46 | |
| 47 | #define ULPI_PWR_CLK_MNG_REG 0x88 |
| 48 | #define ULPI_PWR_OTG_COMP_DISABLE BIT(0) |
| 49 | |
| 50 | #define ULPI_MISC_A 0x96 |
| 51 | #define ULPI_MISC_A_VBUSVLDEXTSEL BIT(1) |
| 52 | #define ULPI_MISC_A_VBUSVLDEXT BIT(0) |
| 53 | |
| 54 | #define HSPHY_3P3_MIN 3050000 /* uV */ |
| 55 | #define HSPHY_3P3_MAX 3300000 /* uV */ |
| 56 | |
| 57 | #define HSPHY_1P8_MIN 1800000 /* uV */ |
| 58 | #define HSPHY_1P8_MAX 1800000 /* uV */ |
| 59 | |
| 60 | #define HSPHY_VDD_MIN 5 |
| 61 | #define HSPHY_VDD_MAX 7 |
| 62 | |
| 63 | struct phy_8x16 { |
| 64 | struct usb_phy phy; |
| 65 | void __iomem *regs; |
| 66 | struct clk *core_clk; |
| 67 | struct clk *iface_clk; |
| 68 | struct regulator *v3p3; |
| 69 | struct regulator *v1p8; |
| 70 | struct regulator *vdd; |
| 71 | |
| 72 | struct reset_control *phy_reset; |
| 73 | |
Ivan T. Ivanov | 7ed855e | 2015-09-07 14:24:36 +0300 | [diff] [blame^] | 74 | struct extcon_dev *vbus_edev; |
Ivan T. Ivanov | 3511699 | 2015-07-08 17:57:40 +0300 | [diff] [blame] | 75 | struct notifier_block vbus_notify; |
| 76 | |
| 77 | struct gpio_desc *switch_gpio; |
| 78 | struct notifier_block reboot_notify; |
| 79 | }; |
| 80 | |
| 81 | static int phy_8x16_regulators_enable(struct phy_8x16 *qphy) |
| 82 | { |
| 83 | int ret; |
| 84 | |
| 85 | ret = regulator_set_voltage(qphy->vdd, HSPHY_VDD_MIN, HSPHY_VDD_MAX); |
| 86 | if (ret) |
| 87 | return ret; |
| 88 | |
| 89 | ret = regulator_enable(qphy->vdd); |
| 90 | if (ret) |
| 91 | return ret; |
| 92 | |
| 93 | ret = regulator_set_voltage(qphy->v3p3, HSPHY_3P3_MIN, HSPHY_3P3_MAX); |
| 94 | if (ret) |
| 95 | goto off_vdd; |
| 96 | |
| 97 | ret = regulator_enable(qphy->v3p3); |
| 98 | if (ret) |
| 99 | goto off_vdd; |
| 100 | |
| 101 | ret = regulator_set_voltage(qphy->v1p8, HSPHY_1P8_MIN, HSPHY_1P8_MAX); |
| 102 | if (ret) |
| 103 | goto off_3p3; |
| 104 | |
| 105 | ret = regulator_enable(qphy->v1p8); |
| 106 | if (ret) |
| 107 | goto off_3p3; |
| 108 | |
| 109 | return 0; |
| 110 | |
| 111 | off_3p3: |
| 112 | regulator_disable(qphy->v3p3); |
| 113 | off_vdd: |
| 114 | regulator_disable(qphy->vdd); |
| 115 | |
| 116 | return ret; |
| 117 | } |
| 118 | |
| 119 | static void phy_8x16_regulators_disable(struct phy_8x16 *qphy) |
| 120 | { |
| 121 | regulator_disable(qphy->v1p8); |
| 122 | regulator_disable(qphy->v3p3); |
| 123 | regulator_disable(qphy->vdd); |
| 124 | } |
| 125 | |
| 126 | static int phy_8x16_notify_connect(struct usb_phy *phy, |
| 127 | enum usb_device_speed speed) |
| 128 | { |
| 129 | struct phy_8x16 *qphy = container_of(phy, struct phy_8x16, phy); |
| 130 | u32 val; |
| 131 | |
| 132 | val = ULPI_MISC_A_VBUSVLDEXTSEL | ULPI_MISC_A_VBUSVLDEXT; |
| 133 | usb_phy_io_write(&qphy->phy, val, ULPI_SET(ULPI_MISC_A)); |
| 134 | |
| 135 | val = readl(qphy->regs + HSPHY_USBCMD); |
| 136 | val |= HSPHY_SESS_VLD_CTRL; |
| 137 | writel(val, qphy->regs + HSPHY_USBCMD); |
| 138 | |
| 139 | return 0; |
| 140 | } |
| 141 | |
| 142 | static int phy_8x16_notify_disconnect(struct usb_phy *phy, |
| 143 | enum usb_device_speed speed) |
| 144 | { |
| 145 | struct phy_8x16 *qphy = container_of(phy, struct phy_8x16, phy); |
| 146 | u32 val; |
| 147 | |
| 148 | val = ULPI_MISC_A_VBUSVLDEXT | ULPI_MISC_A_VBUSVLDEXTSEL; |
| 149 | usb_phy_io_write(&qphy->phy, val, ULPI_CLR(ULPI_MISC_A)); |
| 150 | |
| 151 | val = readl(qphy->regs + HSPHY_USBCMD); |
| 152 | val &= ~HSPHY_SESS_VLD_CTRL; |
| 153 | writel(val, qphy->regs + HSPHY_USBCMD); |
| 154 | |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | static int phy_8x16_vbus_on(struct phy_8x16 *qphy) |
| 159 | { |
| 160 | phy_8x16_notify_connect(&qphy->phy, USB_SPEED_UNKNOWN); |
| 161 | |
| 162 | /* Switch D+/D- lines to Device connector */ |
| 163 | gpiod_set_value_cansleep(qphy->switch_gpio, 0); |
| 164 | |
| 165 | return 0; |
| 166 | } |
| 167 | |
| 168 | static int phy_8x16_vbus_off(struct phy_8x16 *qphy) |
| 169 | { |
| 170 | phy_8x16_notify_disconnect(&qphy->phy, USB_SPEED_UNKNOWN); |
| 171 | |
| 172 | /* Switch D+/D- lines to USB HUB */ |
| 173 | gpiod_set_value_cansleep(qphy->switch_gpio, 1); |
| 174 | |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | static int phy_8x16_vbus_notify(struct notifier_block *nb, unsigned long event, |
| 179 | void *ptr) |
| 180 | { |
| 181 | struct phy_8x16 *qphy = container_of(nb, struct phy_8x16, vbus_notify); |
| 182 | |
| 183 | if (event) |
| 184 | phy_8x16_vbus_on(qphy); |
| 185 | else |
| 186 | phy_8x16_vbus_off(qphy); |
| 187 | |
| 188 | return NOTIFY_DONE; |
| 189 | } |
| 190 | |
| 191 | static int phy_8x16_init(struct usb_phy *phy) |
| 192 | { |
| 193 | struct phy_8x16 *qphy = container_of(phy, struct phy_8x16, phy); |
| 194 | u32 val, init[] = {0x44, 0x6B, 0x24, 0x13}; |
| 195 | u32 addr = ULPI_EXT_VENDOR_SPECIFIC; |
| 196 | int idx, state; |
| 197 | |
| 198 | for (idx = 0; idx < ARRAY_SIZE(init); idx++) |
| 199 | usb_phy_io_write(phy, init[idx], addr + idx); |
| 200 | |
| 201 | reset_control_reset(qphy->phy_reset); |
| 202 | |
| 203 | /* Assert USB HSPHY_POR */ |
| 204 | val = readl(qphy->regs + HSPHY_CTRL); |
| 205 | val |= HSPHY_POR_ASSERT; |
| 206 | writel(val, qphy->regs + HSPHY_CTRL); |
| 207 | |
| 208 | /* |
| 209 | * wait for minimum 10 microseconds as suggested in HPG. |
| 210 | * Use a slightly larger value since the exact value didn't |
| 211 | * work 100% of the time. |
| 212 | */ |
| 213 | usleep_range(12, 15); |
| 214 | |
| 215 | /* Deassert USB HSPHY_POR */ |
| 216 | val = readl(qphy->regs + HSPHY_CTRL); |
| 217 | val &= ~HSPHY_POR_ASSERT; |
| 218 | writel(val, qphy->regs + HSPHY_CTRL); |
| 219 | |
| 220 | usleep_range(10, 15); |
| 221 | |
| 222 | writel(0x00, qphy->regs + HSPHY_AHBBURST); |
| 223 | writel(0x08, qphy->regs + HSPHY_AHBMODE); |
| 224 | |
| 225 | /* workaround for rx buffer collision issue */ |
| 226 | val = readl(qphy->regs + HSPHY_GENCONFIG); |
| 227 | val &= ~HSPHY_TXFIFO_IDLE_FORCE_DIS; |
| 228 | writel(val, qphy->regs + HSPHY_GENCONFIG); |
| 229 | |
| 230 | val = readl(qphy->regs + HSPHY_GENCONFIG_2); |
| 231 | val |= HSPHY_SESS_VLD_CTRL_EN; |
| 232 | writel(val, qphy->regs + HSPHY_GENCONFIG_2); |
| 233 | |
| 234 | val = ULPI_PWR_OTG_COMP_DISABLE; |
| 235 | usb_phy_io_write(phy, val, ULPI_SET(ULPI_PWR_CLK_MNG_REG)); |
| 236 | |
Ivan T. Ivanov | 7ed855e | 2015-09-07 14:24:36 +0300 | [diff] [blame^] | 237 | state = extcon_get_cable_state_(qphy->vbus_edev, EXTCON_USB); |
Ivan T. Ivanov | 3511699 | 2015-07-08 17:57:40 +0300 | [diff] [blame] | 238 | if (state) |
| 239 | phy_8x16_vbus_on(qphy); |
| 240 | else |
| 241 | phy_8x16_vbus_off(qphy); |
| 242 | |
| 243 | val = usb_phy_io_read(&qphy->phy, ULPI_FUNC_CTRL); |
| 244 | val &= ~ULPI_FUNC_CTRL_OPMODE_MASK; |
| 245 | val |= ULPI_FUNC_CTRL_OPMODE_NORMAL; |
| 246 | usb_phy_io_write(&qphy->phy, val, ULPI_FUNC_CTRL); |
| 247 | |
| 248 | return 0; |
| 249 | } |
| 250 | |
| 251 | static void phy_8x16_shutdown(struct usb_phy *phy) |
| 252 | { |
| 253 | u32 val; |
| 254 | |
| 255 | /* Put the controller in non-driving mode */ |
| 256 | val = usb_phy_io_read(phy, ULPI_FUNC_CTRL); |
| 257 | val &= ~ULPI_FUNC_CTRL_OPMODE_MASK; |
| 258 | val |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING; |
| 259 | usb_phy_io_write(phy, val, ULPI_FUNC_CTRL); |
| 260 | } |
| 261 | |
| 262 | static int phy_8x16_read_devicetree(struct phy_8x16 *qphy) |
| 263 | { |
| 264 | struct regulator_bulk_data regs[3]; |
| 265 | struct device *dev = qphy->phy.dev; |
| 266 | int ret; |
| 267 | |
| 268 | qphy->core_clk = devm_clk_get(dev, "core"); |
| 269 | if (IS_ERR(qphy->core_clk)) |
| 270 | return PTR_ERR(qphy->core_clk); |
| 271 | |
| 272 | qphy->iface_clk = devm_clk_get(dev, "iface"); |
| 273 | if (IS_ERR(qphy->iface_clk)) |
| 274 | return PTR_ERR(qphy->iface_clk); |
| 275 | |
| 276 | regs[0].supply = "v3p3"; |
| 277 | regs[1].supply = "v1p8"; |
| 278 | regs[2].supply = "vddcx"; |
| 279 | |
| 280 | ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(regs), regs); |
| 281 | if (ret) |
| 282 | return ret; |
| 283 | |
| 284 | qphy->v3p3 = regs[0].consumer; |
| 285 | qphy->v1p8 = regs[1].consumer; |
| 286 | qphy->vdd = regs[2].consumer; |
| 287 | |
| 288 | qphy->phy_reset = devm_reset_control_get(dev, "phy"); |
| 289 | if (IS_ERR(qphy->phy_reset)) |
| 290 | return PTR_ERR(qphy->phy_reset); |
| 291 | |
| 292 | qphy->switch_gpio = devm_gpiod_get_optional(dev, "switch", |
| 293 | GPIOD_OUT_LOW); |
| 294 | if (IS_ERR(qphy->switch_gpio)) |
| 295 | return PTR_ERR(qphy->switch_gpio); |
| 296 | |
| 297 | return 0; |
| 298 | } |
| 299 | |
| 300 | static int phy_8x16_reboot_notify(struct notifier_block *this, |
| 301 | unsigned long code, void *unused) |
| 302 | { |
| 303 | struct phy_8x16 *qphy; |
| 304 | |
| 305 | qphy = container_of(this, struct phy_8x16, reboot_notify); |
| 306 | |
| 307 | /* |
| 308 | * Ensure that D+/D- lines are routed to uB connector, so |
| 309 | * we could load bootloader/kernel at next reboot_notify |
| 310 | */ |
| 311 | gpiod_set_value_cansleep(qphy->switch_gpio, 0); |
| 312 | return NOTIFY_DONE; |
| 313 | } |
| 314 | |
| 315 | static int phy_8x16_probe(struct platform_device *pdev) |
| 316 | { |
Ivan T. Ivanov | 3511699 | 2015-07-08 17:57:40 +0300 | [diff] [blame] | 317 | struct phy_8x16 *qphy; |
| 318 | struct resource *res; |
| 319 | struct usb_phy *phy; |
| 320 | int ret; |
| 321 | |
| 322 | qphy = devm_kzalloc(&pdev->dev, sizeof(*qphy), GFP_KERNEL); |
| 323 | if (!qphy) |
| 324 | return -ENOMEM; |
| 325 | |
| 326 | platform_set_drvdata(pdev, qphy); |
| 327 | |
| 328 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 329 | if (!res) |
| 330 | return -EINVAL; |
| 331 | |
| 332 | qphy->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res)); |
| 333 | if (!qphy->regs) |
| 334 | return -ENOMEM; |
| 335 | |
| 336 | phy = &qphy->phy; |
| 337 | phy->dev = &pdev->dev; |
| 338 | phy->label = dev_name(&pdev->dev); |
| 339 | phy->init = phy_8x16_init; |
| 340 | phy->shutdown = phy_8x16_shutdown; |
| 341 | phy->notify_connect = phy_8x16_notify_connect; |
| 342 | phy->notify_disconnect = phy_8x16_notify_disconnect; |
| 343 | phy->io_priv = qphy->regs + HSPHY_ULPI_VIEWPORT; |
| 344 | phy->io_ops = &ulpi_viewport_access_ops; |
| 345 | phy->type = USB_PHY_TYPE_USB2; |
| 346 | |
| 347 | ret = phy_8x16_read_devicetree(qphy); |
| 348 | if (ret < 0) |
| 349 | return ret; |
| 350 | |
Ivan T. Ivanov | 7ed855e | 2015-09-07 14:24:36 +0300 | [diff] [blame^] | 351 | qphy->vbus_edev = extcon_get_edev_by_phandle(phy->dev, 0); |
| 352 | if (IS_ERR(qphy->vbus_edev)) |
| 353 | return PTR_ERR(qphy->vbus_edev); |
Ivan T. Ivanov | 3511699 | 2015-07-08 17:57:40 +0300 | [diff] [blame] | 354 | |
| 355 | ret = clk_set_rate(qphy->core_clk, INT_MAX); |
| 356 | if (ret < 0) |
| 357 | dev_dbg(phy->dev, "Can't boost core clock\n"); |
| 358 | |
| 359 | ret = clk_prepare_enable(qphy->core_clk); |
| 360 | if (ret < 0) |
| 361 | return ret; |
| 362 | |
| 363 | ret = clk_prepare_enable(qphy->iface_clk); |
| 364 | if (ret < 0) |
| 365 | goto off_core; |
| 366 | |
| 367 | ret = phy_8x16_regulators_enable(qphy); |
| 368 | if (0 && ret) |
| 369 | goto off_clks; |
| 370 | |
| 371 | qphy->vbus_notify.notifier_call = phy_8x16_vbus_notify; |
Ivan T. Ivanov | 7ed855e | 2015-09-07 14:24:36 +0300 | [diff] [blame^] | 372 | ret = extcon_register_notifier(qphy->vbus_edev, EXTCON_USB, |
| 373 | &qphy->vbus_notify); |
Ivan T. Ivanov | 3511699 | 2015-07-08 17:57:40 +0300 | [diff] [blame] | 374 | if (ret < 0) |
| 375 | goto off_power; |
| 376 | |
| 377 | ret = usb_add_phy_dev(&qphy->phy); |
| 378 | if (ret) |
| 379 | goto off_extcon; |
| 380 | |
| 381 | qphy->reboot_notify.notifier_call = phy_8x16_reboot_notify; |
| 382 | register_reboot_notifier(&qphy->reboot_notify); |
| 383 | |
| 384 | return 0; |
| 385 | |
| 386 | off_extcon: |
Ivan T. Ivanov | 7ed855e | 2015-09-07 14:24:36 +0300 | [diff] [blame^] | 387 | extcon_unregister_notifier(qphy->vbus_edev, EXTCON_USB, |
| 388 | &qphy->vbus_notify); |
Ivan T. Ivanov | 3511699 | 2015-07-08 17:57:40 +0300 | [diff] [blame] | 389 | off_power: |
| 390 | phy_8x16_regulators_disable(qphy); |
| 391 | off_clks: |
| 392 | clk_disable_unprepare(qphy->iface_clk); |
| 393 | off_core: |
| 394 | clk_disable_unprepare(qphy->core_clk); |
| 395 | return ret; |
| 396 | } |
| 397 | |
| 398 | static int phy_8x16_remove(struct platform_device *pdev) |
| 399 | { |
| 400 | struct phy_8x16 *qphy = platform_get_drvdata(pdev); |
| 401 | |
| 402 | unregister_reboot_notifier(&qphy->reboot_notify); |
Ivan T. Ivanov | 7ed855e | 2015-09-07 14:24:36 +0300 | [diff] [blame^] | 403 | extcon_unregister_notifier(qphy->vbus_edev, EXTCON_USB, |
| 404 | &qphy->vbus_notify); |
Ivan T. Ivanov | 3511699 | 2015-07-08 17:57:40 +0300 | [diff] [blame] | 405 | |
| 406 | /* |
| 407 | * Ensure that D+/D- lines are routed to uB connector, so |
| 408 | * we could load bootloader/kernel at next reboot_notify |
| 409 | */ |
| 410 | gpiod_set_value_cansleep(qphy->switch_gpio, 0); |
| 411 | |
| 412 | usb_remove_phy(&qphy->phy); |
| 413 | |
| 414 | clk_disable_unprepare(qphy->iface_clk); |
| 415 | clk_disable_unprepare(qphy->core_clk); |
| 416 | phy_8x16_regulators_disable(qphy); |
| 417 | return 0; |
| 418 | } |
| 419 | |
| 420 | static const struct of_device_id phy_8x16_dt_match[] = { |
| 421 | { .compatible = "qcom,usb-8x16-phy" }, |
| 422 | { } |
| 423 | }; |
| 424 | MODULE_DEVICE_TABLE(of, phy_8x16_dt_match); |
| 425 | |
| 426 | static struct platform_driver phy_8x16_driver = { |
| 427 | .probe = phy_8x16_probe, |
| 428 | .remove = phy_8x16_remove, |
| 429 | .driver = { |
| 430 | .name = "phy-qcom-8x16-usb", |
| 431 | .of_match_table = phy_8x16_dt_match, |
| 432 | }, |
| 433 | }; |
| 434 | module_platform_driver(phy_8x16_driver); |
| 435 | |
| 436 | MODULE_LICENSE("GPL v2"); |
| 437 | MODULE_DESCRIPTION("Qualcomm APQ8016/MSM8916 chipsets USB transceiver driver"); |