drivers/phy/phy-rockchip-usb.c

   1 /*
   2  * Rockchip usb PHY driver
   3  *
   4  * Copyright (C) 2014 Yunzhi Li <lyz@rock-chips.com>
   5  * Copyright (C) 2014 ROCKCHIP, Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/clk.h>
  18 #include <linux/clk-provider.h>
  19 #include <linux/io.h>
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/mutex.h>
  23 #include <linux/of.h>
  24 #include <linux/of_address.h>
  25 #include <linux/of_platform.h>
  26 #include <linux/phy/phy.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/regulator/consumer.h>
  29 #include <linux/reset.h>
  30 #include <linux/regmap.h>
  31 #include <linux/mfd/syscon.h>
  32
  33 static int enable_usb_uart;
  34
  35 #define HIWORD_UPDATE(val, mask) \
  36                 ((val) | (mask) << 16)
  37
  38 #define UOC_CON0_SIDDQ BIT(13)
  39
  40 struct rockchip_usb_phys {
  41         int reg;
  42         const char *pll_name;
  43 };
  44
  45 struct rockchip_usb_phy_base;
  46 struct rockchip_usb_phy_pdata {
  47         struct rockchip_usb_phys *phys;
  48         int (*init_usb_uart)(struct regmap *grf);
  49         int usb_uart_phy;
  50 };
  51
  52 struct rockchip_usb_phy_base {
  53         struct device *dev;
  54         struct regmap *reg_base;
  55         const struct rockchip_usb_phy_pdata *pdata;
  56 };
  57
  58 struct rockchip_usb_phy {
  59         struct rockchip_usb_phy_base *base;
  60         struct device_node *np;
  61         unsigned int    reg_offset;
  62         struct clk      *clk;
  63         struct clk      *clk480m;
  64         struct clk_hw   clk480m_hw;
  65         struct phy      *phy;
  66         bool            uart_enabled;
  67 };
  68
  69 static int rockchip_usb_phy_power(struct rockchip_usb_phy *phy,
  70                                            bool siddq)
  71 {
  72         u32 val = HIWORD_UPDATE(siddq ? UOC_CON0_SIDDQ : 0, UOC_CON0_SIDDQ);
  73
  74         return regmap_write(phy->base->reg_base, phy->reg_offset, val);
  75 }
  76
  77 static unsigned long rockchip_usb_phy480m_recalc_rate(struct clk_hw *hw,
  78                                                 unsigned long parent_rate)
  79 {
  80         return 480000000;
  81 }
  82
  83 static void rockchip_usb_phy480m_disable(struct clk_hw *hw)
  84 {
  85         struct rockchip_usb_phy *phy = container_of(hw,
  86                                                     struct rockchip_usb_phy,
  87                                                     clk480m_hw);
  88
  89         /* Power down usb phy analog blocks by set siddq 1 */
  90         rockchip_usb_phy_power(phy, 1);
  91 }
  92
  93 static int rockchip_usb_phy480m_enable(struct clk_hw *hw)
  94 {
  95         struct rockchip_usb_phy *phy = container_of(hw,
  96                                                     struct rockchip_usb_phy,
  97                                                     clk480m_hw);
  98
  99         /* Power up usb phy analog blocks by set siddq 0 */
 100         return rockchip_usb_phy_power(phy, 0);
 101 }
 102
 103 static int rockchip_usb_phy480m_is_enabled(struct clk_hw *hw)
 104 {
 105         struct rockchip_usb_phy *phy = container_of(hw,
 106                                                     struct rockchip_usb_phy,
 107                                                     clk480m_hw);
 108         int ret;
 109         u32 val;
 110
 111         ret = regmap_read(phy->base->reg_base, phy->reg_offset, &val);
 112         if (ret < 0)
 113                 return ret;
 114
 115         return (val & UOC_CON0_SIDDQ) ? 0 : 1;
 116 }
 117
 118 static const struct clk_ops rockchip_usb_phy480m_ops = {
 119         .enable = rockchip_usb_phy480m_enable,
 120         .disable = rockchip_usb_phy480m_disable,
 121         .is_enabled = rockchip_usb_phy480m_is_enabled,
 122         .recalc_rate = rockchip_usb_phy480m_recalc_rate,
 123 };
 124
 125 static int rockchip_usb_phy_power_off(struct phy *_phy)
 126 {
 127         struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);
 128
 129         if (phy->uart_enabled)
 130                 return -EBUSY;
 131
 132         clk_disable_unprepare(phy->clk480m);
 133
 134         return 0;
 135 }
 136
 137 static int rockchip_usb_phy_power_on(struct phy *_phy)
 138 {
 139         struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);
 140
 141         if (phy->uart_enabled)
 142                 return -EBUSY;
 143
 144         return clk_prepare_enable(phy->clk480m);
 145 }
 146
 147 static const struct phy_ops ops = {
 148         .power_on       = rockchip_usb_phy_power_on,
 149         .power_off      = rockchip_usb_phy_power_off,
 150         .owner          = THIS_MODULE,
 151 };
 152
 153 static void rockchip_usb_phy_action(void *data)
 154 {
 155         struct rockchip_usb_phy *rk_phy = data;
 156
 157         if (!rk_phy->uart_enabled) {
 158                 of_clk_del_provider(rk_phy->np);
 159                 clk_unregister(rk_phy->clk480m);
 160         }
 161
 162         if (rk_phy->clk)
 163                 clk_put(rk_phy->clk);
 164 }
 165
 166 static int rockchip_usb_phy_init(struct rockchip_usb_phy_base *base,
 167                                  struct device_node *child)
 168 {
 169         struct rockchip_usb_phy *rk_phy;
 170         unsigned int reg_offset;
 171         const char *clk_name;
 172         struct clk_init_data init;
 173         int err, i;
 174
 175         rk_phy = devm_kzalloc(base->dev, sizeof(*rk_phy), GFP_KERNEL);
 176         if (!rk_phy)
 177                 return -ENOMEM;
 178
 179         rk_phy->base = base;
 180         rk_phy->np = child;
 181
 182         if (of_property_read_u32(child, "reg", &reg_offset)) {
 183                 dev_err(base->dev, "missing reg property in node %s\n",
 184                         child->name);
 185                 return -EINVAL;
 186         }
 187
 188         rk_phy->reg_offset = reg_offset;
 189
 190         rk_phy->clk = of_clk_get_by_name(child, "phyclk");
 191         if (IS_ERR(rk_phy->clk))
 192                 rk_phy->clk = NULL;
 193
 194         i = 0;
 195         init.name = NULL;
 196         while (base->pdata->phys[i].reg) {
 197                 if (base->pdata->phys[i].reg == reg_offset) {
 198                         init.name = base->pdata->phys[i].pll_name;
 199                         break;
 200                 }
 201                 i++;
 202         }
 203
 204         if (!init.name) {
 205                 dev_err(base->dev, "phy data not found\n");
 206                 return -EINVAL;
 207         }
 208
 209         if (enable_usb_uart && base->pdata->usb_uart_phy == i) {
 210                 dev_dbg(base->dev, "phy%d used as uart output\n", i);
 211                 rk_phy->uart_enabled = true;
 212         } else {
 213                 if (rk_phy->clk) {
 214                         clk_name = __clk_get_name(rk_phy->clk);
 215                         init.flags = 0;
 216                         init.parent_names = &clk_name;
 217                         init.num_parents = 1;
 218                 } else {
 219                         init.flags = 0;
 220                         init.parent_names = NULL;
 221                         init.num_parents = 0;
 222                 }
 223
 224                 init.ops = &rockchip_usb_phy480m_ops;
 225                 rk_phy->clk480m_hw.init = &init;
 226
 227                 rk_phy->clk480m = clk_register(base->dev, &rk_phy->clk480m_hw);
 228                 if (IS_ERR(rk_phy->clk480m)) {
 229                         err = PTR_ERR(rk_phy->clk480m);
 230                         goto err_clk;
 231                 }
 232
 233                 err = of_clk_add_provider(child, of_clk_src_simple_get,
 234                                         rk_phy->clk480m);
 235                 if (err < 0)
 236                         goto err_clk_prov;
 237         }
 238
 239         err = devm_add_action(base->dev, rockchip_usb_phy_action, rk_phy);
 240         if (err)
 241                 goto err_devm_action;
 242
 243         rk_phy->phy = devm_phy_create(base->dev, child, &ops);
 244         if (IS_ERR(rk_phy->phy)) {
 245                 dev_err(base->dev, "failed to create PHY\n");
 246                 return PTR_ERR(rk_phy->phy);
 247         }
 248         phy_set_drvdata(rk_phy->phy, rk_phy);
 249
 250         /*
 251          * When acting as uart-pipe, just keep clock on otherwise
 252          * only power up usb phy when it use, so disable it when init
 253          */
 254         if (rk_phy->uart_enabled)
 255                 return clk_prepare_enable(rk_phy->clk);
 256         else
 257                 return rockchip_usb_phy_power(rk_phy, 1);
 258
 259 err_devm_action:
 260         if (!rk_phy->uart_enabled)
 261                 of_clk_del_provider(child);
 262 err_clk_prov:
 263         if (!rk_phy->uart_enabled)
 264                 clk_unregister(rk_phy->clk480m);
 265 err_clk:
 266         if (rk_phy->clk)
 267                 clk_put(rk_phy->clk);
 268         return err;
 269 }
 270
 271 static const struct rockchip_usb_phy_pdata rk3066a_pdata = {
 272         .phys = (struct rockchip_usb_phys[]){
 273                 { .reg = 0x17c, .pll_name = "sclk_otgphy0_480m" },
 274                 { .reg = 0x188, .pll_name = "sclk_otgphy1_480m" },
 275                 { /* sentinel */ }
 276         },
 277 };
 278
 279 static const struct rockchip_usb_phy_pdata rk3188_pdata = {
 280         .phys = (struct rockchip_usb_phys[]){
 281                 { .reg = 0x10c, .pll_name = "sclk_otgphy0_480m" },
 282                 { .reg = 0x11c, .pll_name = "sclk_otgphy1_480m" },
 283                 { /* sentinel */ }
 284         },
 285 };
 286
 287 #define RK3288_UOC0_CON0                                0x320
 288 #define RK3288_UOC0_CON0_COMMON_ON_N                    BIT(0)
 289 #define RK3288_UOC0_CON0_DISABLE                        BIT(4)
 290
 291 #define RK3288_UOC0_CON2                                0x328
 292 #define RK3288_UOC0_CON2_SOFT_CON_SEL                   BIT(2)
 293
 294 #define RK3288_UOC0_CON3                                0x32c
 295 #define RK3288_UOC0_CON3_UTMI_SUSPENDN                  BIT(0)
 296 #define RK3288_UOC0_CON3_UTMI_OPMODE_NODRIVING          (1 << 1)
 297 #define RK3288_UOC0_CON3_UTMI_OPMODE_MASK               (3 << 1)
 298 #define RK3288_UOC0_CON3_UTMI_XCVRSEELCT_FSTRANSC       (1 << 3)
 299 #define RK3288_UOC0_CON3_UTMI_XCVRSEELCT_MASK           (3 << 3)
 300 #define RK3288_UOC0_CON3_UTMI_TERMSEL_FULLSPEED         BIT(5)
 301 #define RK3288_UOC0_CON3_BYPASSDMEN                     BIT(6)
 302 #define RK3288_UOC0_CON3_BYPASSSEL                      BIT(7)
 303
 304 /*
 305  * Enable the bypass of uart2 data through the otg usb phy.
 306  * Original description in the TRM.
 307  * 1. Disable the OTG block by setting OTGDISABLE0 to 1’b1.
 308  * 2. Disable the pull-up resistance on the D+ line by setting
 309  *    OPMODE0[1:0] to 2’b01.
 310  * 3. To ensure that the XO, Bias, and PLL blocks are powered down in Suspend
 311  *    mode, set COMMONONN to 1’b1.
 312  * 4. Place the USB PHY in Suspend mode by setting SUSPENDM0 to 1’b0.
 313  * 5. Set BYPASSSEL0 to 1’b1.
 314  * 6. To transmit data, controls BYPASSDMEN0, and BYPASSDMDATA0.
 315  * To receive data, monitor FSVPLUS0.
 316  *
 317  * The actual code in the vendor kernel does some things differently.
 318  */
 319 static int __init rk3288_init_usb_uart(struct regmap *grf)
 320 {
 321         u32 val;
 322         int ret;
 323
 324         /*
 325          * COMMON_ON and DISABLE settings are described in the TRM,
 326          * but were not present in the original code.
 327          * Also disable the analog phy components to save power.
 328          */
 329         val = HIWORD_UPDATE(RK3288_UOC0_CON0_COMMON_ON_N
 330                                 | RK3288_UOC0_CON0_DISABLE
 331                                 | UOC_CON0_SIDDQ,
 332                             RK3288_UOC0_CON0_COMMON_ON_N
 333                                 | RK3288_UOC0_CON0_DISABLE
 334                                 | UOC_CON0_SIDDQ);
 335         ret = regmap_write(grf, RK3288_UOC0_CON0, val);
 336         if (ret)
 337                 return ret;
 338
 339         val = HIWORD_UPDATE(RK3288_UOC0_CON2_SOFT_CON_SEL,
 340                             RK3288_UOC0_CON2_SOFT_CON_SEL);
 341         ret = regmap_write(grf, RK3288_UOC0_CON2, val);
 342         if (ret)
 343                 return ret;
 344
 345         val = HIWORD_UPDATE(RK3288_UOC0_CON3_UTMI_OPMODE_NODRIVING
 346                                 | RK3288_UOC0_CON3_UTMI_XCVRSEELCT_FSTRANSC
 347                                 | RK3288_UOC0_CON3_UTMI_TERMSEL_FULLSPEED,
 348                             RK3288_UOC0_CON3_UTMI_SUSPENDN
 349                                 | RK3288_UOC0_CON3_UTMI_OPMODE_MASK
 350                                 | RK3288_UOC0_CON3_UTMI_XCVRSEELCT_MASK
 351                                 | RK3288_UOC0_CON3_UTMI_TERMSEL_FULLSPEED);
 352         ret = regmap_write(grf, RK3288_UOC0_CON3, val);
 353         if (ret)
 354                 return ret;
 355
 356         val = HIWORD_UPDATE(RK3288_UOC0_CON3_BYPASSSEL
 357                                 | RK3288_UOC0_CON3_BYPASSDMEN,
 358                             RK3288_UOC0_CON3_BYPASSSEL
 359                                 | RK3288_UOC0_CON3_BYPASSDMEN);
 360         ret = regmap_write(grf, RK3288_UOC0_CON3, val);
 361         if (ret)
 362                 return ret;
 363
 364         return 0;
 365 }
 366
 367 static const struct rockchip_usb_phy_pdata rk3288_pdata = {
 368         .phys = (struct rockchip_usb_phys[]){
 369                 { .reg = 0x320, .pll_name = "sclk_otgphy0_480m" },
 370                 { .reg = 0x334, .pll_name = "sclk_otgphy1_480m" },
 371                 { .reg = 0x348, .pll_name = "sclk_otgphy2_480m" },
 372                 { /* sentinel */ }
 373         },
 374         .init_usb_uart = rk3288_init_usb_uart,
 375         .usb_uart_phy = 0,
 376 };
 377
 378 static int rockchip_usb_phy_probe(struct platform_device *pdev)
 379 {
 380         struct device *dev = &pdev->dev;
 381         struct rockchip_usb_phy_base *phy_base;
 382         struct phy_provider *phy_provider;
 383         const struct of_device_id *match;
 384         struct device_node *child;
 385         int err;
 386
 387         phy_base = devm_kzalloc(dev, sizeof(*phy_base), GFP_KERNEL);
 388         if (!phy_base)
 389                 return -ENOMEM;
 390
 391         match = of_match_device(dev->driver->of_match_table, dev);
 392         if (!match || !match->data) {
 393                 dev_err(dev, "missing phy data\n");
 394                 return -EINVAL;
 395         }
 396
 397         phy_base->pdata = match->data;
 398
 399         phy_base->dev = dev;
 400         phy_base->reg_base = syscon_regmap_lookup_by_phandle(dev->of_node,
 401                                                              "rockchip,grf");
 402         if (IS_ERR(phy_base->reg_base)) {
 403                 dev_err(&pdev->dev, "Missing rockchip,grf property\n");
 404                 return PTR_ERR(phy_base->reg_base);
 405         }
 406
 407         for_each_available_child_of_node(dev->of_node, child) {
 408                 err = rockchip_usb_phy_init(phy_base, child);
 409                 if (err) {
 410                         of_node_put(child);
 411                         return err;
 412                 }
 413         }
 414
 415         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 416         return PTR_ERR_OR_ZERO(phy_provider);
 417 }
 418
 419 static const struct of_device_id rockchip_usb_phy_dt_ids[] = {
 420         { .compatible = "rockchip,rk3066a-usb-phy", .data = &rk3066a_pdata },
 421         { .compatible = "rockchip,rk3188-usb-phy", .data = &rk3188_pdata },
 422         { .compatible = "rockchip,rk3288-usb-phy", .data = &rk3288_pdata },
 423         {}
 424 };
 425
 426 MODULE_DEVICE_TABLE(of, rockchip_usb_phy_dt_ids);
 427
 428 static struct platform_driver rockchip_usb_driver = {
 429         .probe          = rockchip_usb_phy_probe,
 430         .driver         = {
 431                 .name   = "rockchip-usb-phy",
 432                 .of_match_table = rockchip_usb_phy_dt_ids,
 433         },
 434 };
 435
 436 module_platform_driver(rockchip_usb_driver);
 437
 438 #ifndef MODULE
 439 static int __init rockchip_init_usb_uart(void)
 440 {
 441         const struct of_device_id *match;
 442         const struct rockchip_usb_phy_pdata *data;
 443         struct device_node *np;
 444         struct regmap *grf;
 445         int ret;
 446
 447         if (!enable_usb_uart)
 448                 return 0;
 449
 450         np = of_find_matching_node_and_match(NULL, rockchip_usb_phy_dt_ids,
 451                                              &match);
 452         if (!np) {
 453                 pr_err("%s: failed to find usbphy node\n", __func__);
 454                 return -ENOTSUPP;
 455         }
 456
 457         pr_debug("%s: using settings for %s\n", __func__, match->compatible);
 458         data = match->data;
 459
 460         if (!data->init_usb_uart) {
 461                 pr_err("%s: usb-uart not available on %s\n",
 462                        __func__, match->compatible);
 463                 return -ENOTSUPP;
 464         }
 465
 466         grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
 467         if (IS_ERR(grf)) {
 468                 pr_err("%s: Missing rockchip,grf property, %lu\n",
 469                        __func__, PTR_ERR(grf));
 470                 return PTR_ERR(grf);
 471         }
 472
 473         ret = data->init_usb_uart(grf);
 474         if (ret) {
 475                 pr_err("%s: could not init usb_uart, %d\n", __func__, ret);
 476                 enable_usb_uart = 0;
 477                 return ret;
 478         }
 479
 480         return 0;
 481 }
 482 early_initcall(rockchip_init_usb_uart);
 483
 484 static int __init rockchip_usb_uart(char *buf)
 485 {
 486         enable_usb_uart = true;
 487         return 0;
 488 }
 489 early_param("rockchip.usb_uart", rockchip_usb_uart);
 490 #endif
 491
 492 MODULE_AUTHOR("Yunzhi Li <lyz@rock-chips.com>");
 493 MODULE_DESCRIPTION("Rockchip USB 2.0 PHY driver");
 494 MODULE_LICENSE("GPL v2");