drivers/phy/phy-ti-pipe3.c

   1 /*
   2  * phy-ti-pipe3 - PIPE3 PHY driver.
   3  *
   4  * Copyright (C) 2013 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: Kishon Vijay Abraham I <kishon@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  */
  18
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/slab.h>
  22 #include <linux/phy/phy.h>
  23 #include <linux/of.h>
  24 #include <linux/clk.h>
  25 #include <linux/err.h>
  26 #include <linux/io.h>
  27 #include <linux/pm_runtime.h>
  28 #include <linux/delay.h>
  29 #include <linux/phy/omap_control_phy.h>
  30 #include <linux/of_platform.h>
  31
  32 #define PLL_STATUS              0x00000004
  33 #define PLL_GO                  0x00000008
  34 #define PLL_CONFIGURATION1      0x0000000C
  35 #define PLL_CONFIGURATION2      0x00000010
  36 #define PLL_CONFIGURATION3      0x00000014
  37 #define PLL_CONFIGURATION4      0x00000020
  38
  39 #define PLL_REGM_MASK           0x001FFE00
  40 #define PLL_REGM_SHIFT          0x9
  41 #define PLL_REGM_F_MASK         0x0003FFFF
  42 #define PLL_REGM_F_SHIFT        0x0
  43 #define PLL_REGN_MASK           0x000001FE
  44 #define PLL_REGN_SHIFT          0x1
  45 #define PLL_SELFREQDCO_MASK     0x0000000E
  46 #define PLL_SELFREQDCO_SHIFT    0x1
  47 #define PLL_SD_MASK             0x0003FC00
  48 #define PLL_SD_SHIFT            10
  49 #define SET_PLL_GO              0x1
  50 #define PLL_LDOPWDN             BIT(15)
  51 #define PLL_TICOPWDN            BIT(16)
  52 #define PLL_LOCK                0x2
  53 #define PLL_IDLE                0x1
  54
  55 /*
  56  * This is an Empirical value that works, need to confirm the actual
  57  * value required for the PIPE3PHY_PLL_CONFIGURATION2.PLL_IDLE status
  58  * to be correctly reflected in the PIPE3PHY_PLL_STATUS register.
  59  */
  60 #define PLL_IDLE_TIME   100     /* in milliseconds */
  61 #define PLL_LOCK_TIME   100     /* in milliseconds */
  62
  63 struct pipe3_dpll_params {
  64         u16     m;
  65         u8      n;
  66         u8      freq:3;
  67         u8      sd;
  68         u32     mf;
  69 };
  70
  71 struct pipe3_dpll_map {
  72         unsigned long rate;
  73         struct pipe3_dpll_params params;
  74 };
  75
  76 struct ti_pipe3 {
  77         void __iomem            *pll_ctrl_base;
  78         struct device           *dev;
  79         struct device           *control_dev;
  80         struct clk              *wkupclk;
  81         struct clk              *sys_clk;
  82         struct clk              *refclk;
  83         struct clk              *div_clk;
  84         struct pipe3_dpll_map   *dpll_map;
  85         u8                      id;
  86 };
  87
  88 static struct pipe3_dpll_map dpll_map_usb[] = {
  89         {12000000, {1250, 5, 4, 20, 0} },       /* 12 MHz */
  90         {16800000, {3125, 20, 4, 20, 0} },      /* 16.8 MHz */
  91         {19200000, {1172, 8, 4, 20, 65537} },   /* 19.2 MHz */
  92         {20000000, {1000, 7, 4, 10, 0} },       /* 20 MHz */
  93         {26000000, {1250, 12, 4, 20, 0} },      /* 26 MHz */
  94         {38400000, {3125, 47, 4, 20, 92843} },  /* 38.4 MHz */
  95         { },                                    /* Terminator */
  96 };
  97
  98 static struct pipe3_dpll_map dpll_map_sata[] = {
  99         {12000000, {1000, 7, 4, 6, 0} },        /* 12 MHz */
 100         {16800000, {714, 7, 4, 6, 0} },         /* 16.8 MHz */
 101         {19200000, {625, 7, 4, 6, 0} },         /* 19.2 MHz */
 102         {20000000, {600, 7, 4, 6, 0} },         /* 20 MHz */
 103         {26000000, {461, 7, 4, 6, 0} },         /* 26 MHz */
 104         {38400000, {312, 7, 4, 6, 0} },         /* 38.4 MHz */
 105         { },                                    /* Terminator */
 106 };
 107
 108 static inline u32 ti_pipe3_readl(void __iomem *addr, unsigned offset)
 109 {
 110         return __raw_readl(addr + offset);
 111 }
 112
 113 static inline void ti_pipe3_writel(void __iomem *addr, unsigned offset,
 114         u32 data)
 115 {
 116         __raw_writel(data, addr + offset);
 117 }
 118
 119 static struct pipe3_dpll_params *ti_pipe3_get_dpll_params(struct ti_pipe3 *phy)
 120 {
 121         unsigned long rate;
 122         struct pipe3_dpll_map *dpll_map = phy->dpll_map;
 123
 124         rate = clk_get_rate(phy->sys_clk);
 125
 126         for (; dpll_map->rate; dpll_map++) {
 127                 if (rate == dpll_map->rate)
 128                         return &dpll_map->params;
 129         }
 130
 131         dev_err(phy->dev, "No DPLL configuration for %lu Hz SYS CLK\n", rate);
 132
 133         return NULL;
 134 }
 135
 136 static int ti_pipe3_power_off(struct phy *x)
 137 {
 138         struct ti_pipe3 *phy = phy_get_drvdata(x);
 139
 140         omap_control_phy_power(phy->control_dev, 0);
 141
 142         return 0;
 143 }
 144
 145 static int ti_pipe3_power_on(struct phy *x)
 146 {
 147         struct ti_pipe3 *phy = phy_get_drvdata(x);
 148
 149         omap_control_phy_power(phy->control_dev, 1);
 150
 151         return 0;
 152 }
 153
 154 static int ti_pipe3_dpll_wait_lock(struct ti_pipe3 *phy)
 155 {
 156         u32             val;
 157         unsigned long   timeout;
 158
 159         timeout = jiffies + msecs_to_jiffies(PLL_LOCK_TIME);
 160         do {
 161                 cpu_relax();
 162                 val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_STATUS);
 163                 if (val & PLL_LOCK)
 164                         break;
 165         } while (!time_after(jiffies, timeout));
 166
 167         if (!(val & PLL_LOCK)) {
 168                 dev_err(phy->dev, "DPLL failed to lock\n");
 169                 return -EBUSY;
 170         }
 171
 172         return 0;
 173 }
 174
 175 static int ti_pipe3_dpll_program(struct ti_pipe3 *phy)
 176 {
 177         u32                     val;
 178         struct pipe3_dpll_params *dpll_params;
 179
 180         dpll_params = ti_pipe3_get_dpll_params(phy);
 181         if (!dpll_params)
 182                 return -EINVAL;
 183
 184         val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION1);
 185         val &= ~PLL_REGN_MASK;
 186         val |= dpll_params->n << PLL_REGN_SHIFT;
 187         ti_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION1, val);
 188
 189         val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION2);
 190         val &= ~PLL_SELFREQDCO_MASK;
 191         val |= dpll_params->freq << PLL_SELFREQDCO_SHIFT;
 192         ti_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION2, val);
 193
 194         val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION1);
 195         val &= ~PLL_REGM_MASK;
 196         val |= dpll_params->m << PLL_REGM_SHIFT;
 197         ti_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION1, val);
 198
 199         val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION4);
 200         val &= ~PLL_REGM_F_MASK;
 201         val |= dpll_params->mf << PLL_REGM_F_SHIFT;
 202         ti_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION4, val);
 203
 204         val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION3);
 205         val &= ~PLL_SD_MASK;
 206         val |= dpll_params->sd << PLL_SD_SHIFT;
 207         ti_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION3, val);
 208
 209         ti_pipe3_writel(phy->pll_ctrl_base, PLL_GO, SET_PLL_GO);
 210
 211         return ti_pipe3_dpll_wait_lock(phy);
 212 }
 213
 214 static int ti_pipe3_init(struct phy *x)
 215 {
 216         struct ti_pipe3 *phy = phy_get_drvdata(x);
 217         u32 val;
 218         int ret = 0;
 219
 220         if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie")) {
 221                 omap_control_pcie_pcs(phy->control_dev, phy->id, 0xF1);
 222                 return 0;
 223         }
 224
 225         /* Bring it out of IDLE if it is IDLE */
 226         val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION2);
 227         if (val & PLL_IDLE) {
 228                 val &= ~PLL_IDLE;
 229                 ti_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION2, val);
 230                 ret = ti_pipe3_dpll_wait_lock(phy);
 231         }
 232
 233         /* Program the DPLL only if not locked */
 234         val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_STATUS);
 235         if (!(val & PLL_LOCK))
 236                 if (ti_pipe3_dpll_program(phy))
 237                         return -EINVAL;
 238
 239         return ret;
 240 }
 241
 242 static int ti_pipe3_exit(struct phy *x)
 243 {
 244         struct ti_pipe3 *phy = phy_get_drvdata(x);
 245         u32 val;
 246         unsigned long timeout;
 247
 248         /* SATA DPLL can't be powered down due to Errata i783 and PCIe
 249          * does not have internal DPLL
 250          */
 251         if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-sata") ||
 252             of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie"))
 253                 return 0;
 254
 255         /* Put DPLL in IDLE mode */
 256         val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION2);
 257         val |= PLL_IDLE;
 258         ti_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION2, val);
 259
 260         /* wait for LDO and Oscillator to power down */
 261         timeout = jiffies + msecs_to_jiffies(PLL_IDLE_TIME);
 262         do {
 263                 cpu_relax();
 264                 val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_STATUS);
 265                 if ((val & PLL_TICOPWDN) && (val & PLL_LDOPWDN))
 266                         break;
 267         } while (!time_after(jiffies, timeout));
 268
 269         if (!(val & PLL_TICOPWDN) || !(val & PLL_LDOPWDN)) {
 270                 dev_err(phy->dev, "Failed to power down: PLL_STATUS 0x%x\n",
 271                         val);
 272                 return -EBUSY;
 273         }
 274
 275         return 0;
 276 }
 277 static struct phy_ops ops = {
 278         .init           = ti_pipe3_init,
 279         .exit           = ti_pipe3_exit,
 280         .power_on       = ti_pipe3_power_on,
 281         .power_off      = ti_pipe3_power_off,
 282         .owner          = THIS_MODULE,
 283 };
 284
 285 #ifdef CONFIG_OF
 286 static const struct of_device_id ti_pipe3_id_table[];
 287 #endif
 288
 289 static int ti_pipe3_probe(struct platform_device *pdev)
 290 {
 291         struct ti_pipe3 *phy;
 292         struct phy *generic_phy;
 293         struct phy_provider *phy_provider;
 294         struct resource *res;
 295         struct device_node *node = pdev->dev.of_node;
 296         struct device_node *control_node;
 297         struct platform_device *control_pdev;
 298         const struct of_device_id *match;
 299         struct clk *clk;
 300
 301         phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
 302         if (!phy)
 303                 return -ENOMEM;
 304
 305         phy->dev                = &pdev->dev;
 306
 307         if (!of_device_is_compatible(node, "ti,phy-pipe3-pcie")) {
 308                 match = of_match_device(of_match_ptr(ti_pipe3_id_table),
 309                                         &pdev->dev);
 310                 if (!match)
 311                         return -EINVAL;
 312
 313                 phy->dpll_map = (struct pipe3_dpll_map *)match->data;
 314                 if (!phy->dpll_map) {
 315                         dev_err(&pdev->dev, "no DPLL data\n");
 316                         return -EINVAL;
 317                 }
 318
 319                 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 320                                                    "pll_ctrl");
 321                 phy->pll_ctrl_base = devm_ioremap_resource(&pdev->dev, res);
 322                 if (IS_ERR(phy->pll_ctrl_base))
 323                         return PTR_ERR(phy->pll_ctrl_base);
 324
 325                 phy->sys_clk = devm_clk_get(phy->dev, "sysclk");
 326                 if (IS_ERR(phy->sys_clk)) {
 327                         dev_err(&pdev->dev, "unable to get sysclk\n");
 328                         return -EINVAL;
 329                 }
 330         }
 331
 332         if (!of_device_is_compatible(node, "ti,phy-pipe3-sata")) {
 333                 phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
 334                 if (IS_ERR(phy->wkupclk)) {
 335                         dev_err(&pdev->dev, "unable to get wkupclk\n");
 336                         return PTR_ERR(phy->wkupclk);
 337                 }
 338
 339                 phy->refclk = devm_clk_get(phy->dev, "refclk");
 340                 if (IS_ERR(phy->refclk)) {
 341                         dev_err(&pdev->dev, "unable to get refclk\n");
 342                         return PTR_ERR(phy->refclk);
 343                 }
 344         } else {
 345                 phy->wkupclk = ERR_PTR(-ENODEV);
 346                 phy->refclk = ERR_PTR(-ENODEV);
 347         }
 348
 349         if (of_device_is_compatible(node, "ti,phy-pipe3-pcie")) {
 350                 if (of_property_read_u8(node, "id", &phy->id) < 0)
 351                         phy->id = 1;
 352
 353                 clk = devm_clk_get(phy->dev, "dpll_ref");
 354                 if (IS_ERR(clk)) {
 355                         dev_err(&pdev->dev, "unable to get dpll ref clk\n");
 356                         return PTR_ERR(clk);
 357                 }
 358                 clk_set_rate(clk, 1500000000);
 359
 360                 clk = devm_clk_get(phy->dev, "dpll_ref_m2");
 361                 if (IS_ERR(clk)) {
 362                         dev_err(&pdev->dev, "unable to get dpll ref m2 clk\n");
 363                         return PTR_ERR(clk);
 364                 }
 365                 clk_set_rate(clk, 100000000);
 366
 367                 clk = devm_clk_get(phy->dev, "phy-div");
 368                 if (IS_ERR(clk)) {
 369                         dev_err(&pdev->dev, "unable to get phy-div clk\n");
 370                         return PTR_ERR(clk);
 371                 }
 372                 clk_set_rate(clk, 100000000);
 373
 374                 phy->div_clk = devm_clk_get(phy->dev, "div-clk");
 375                 if (IS_ERR(phy->div_clk)) {
 376                         dev_err(&pdev->dev, "unable to get div-clk\n");
 377                         return PTR_ERR(phy->div_clk);
 378                 }
 379         } else {
 380                 phy->div_clk = ERR_PTR(-ENODEV);
 381         }
 382
 383         control_node = of_parse_phandle(node, "ctrl-module", 0);
 384         if (!control_node) {
 385                 dev_err(&pdev->dev, "Failed to get control device phandle\n");
 386                 return -EINVAL;
 387         }
 388
 389         control_pdev = of_find_device_by_node(control_node);
 390         if (!control_pdev) {
 391                 dev_err(&pdev->dev, "Failed to get control device\n");
 392                 return -EINVAL;
 393         }
 394
 395         phy->control_dev = &control_pdev->dev;
 396
 397         omap_control_phy_power(phy->control_dev, 0);
 398
 399         platform_set_drvdata(pdev, phy);
 400         pm_runtime_enable(phy->dev);
 401
 402         generic_phy = devm_phy_create(phy->dev, NULL, &ops);
 403         if (IS_ERR(generic_phy))
 404                 return PTR_ERR(generic_phy);
 405
 406         phy_set_drvdata(generic_phy, phy);
 407         phy_provider = devm_of_phy_provider_register(phy->dev,
 408                         of_phy_simple_xlate);
 409         if (IS_ERR(phy_provider))
 410                 return PTR_ERR(phy_provider);
 411
 412         pm_runtime_get(&pdev->dev);
 413
 414         return 0;
 415 }
 416
 417 static int ti_pipe3_remove(struct platform_device *pdev)
 418 {
 419         if (!pm_runtime_suspended(&pdev->dev))
 420                 pm_runtime_put(&pdev->dev);
 421         pm_runtime_disable(&pdev->dev);
 422
 423         return 0;
 424 }
 425
 426 #ifdef CONFIG_PM
 427
 428 static int ti_pipe3_runtime_suspend(struct device *dev)
 429 {
 430         struct ti_pipe3 *phy = dev_get_drvdata(dev);
 431
 432         if (!IS_ERR(phy->wkupclk))
 433                 clk_disable_unprepare(phy->wkupclk);
 434         if (!IS_ERR(phy->refclk))
 435                 clk_disable_unprepare(phy->refclk);
 436         if (!IS_ERR(phy->div_clk))
 437                 clk_disable_unprepare(phy->div_clk);
 438
 439         return 0;
 440 }
 441
 442 static int ti_pipe3_runtime_resume(struct device *dev)
 443 {
 444         u32 ret = 0;
 445         struct ti_pipe3 *phy = dev_get_drvdata(dev);
 446
 447         if (!IS_ERR(phy->refclk)) {
 448                 ret = clk_prepare_enable(phy->refclk);
 449                 if (ret) {
 450                         dev_err(phy->dev, "Failed to enable refclk %d\n", ret);
 451                         goto err1;
 452                 }
 453         }
 454
 455         if (!IS_ERR(phy->wkupclk)) {
 456                 ret = clk_prepare_enable(phy->wkupclk);
 457                 if (ret) {
 458                         dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
 459                         goto err2;
 460                 }
 461         }
 462
 463         if (!IS_ERR(phy->div_clk)) {
 464                 ret = clk_prepare_enable(phy->div_clk);
 465                 if (ret) {
 466                         dev_err(phy->dev, "Failed to enable div_clk %d\n", ret);
 467                         goto err3;
 468                 }
 469         }
 470         return 0;
 471
 472 err3:
 473         if (!IS_ERR(phy->wkupclk))
 474                 clk_disable_unprepare(phy->wkupclk);
 475
 476 err2:
 477         if (!IS_ERR(phy->refclk))
 478                 clk_disable_unprepare(phy->refclk);
 479
 480 err1:
 481         return ret;
 482 }
 483
 484 static const struct dev_pm_ops ti_pipe3_pm_ops = {
 485         SET_RUNTIME_PM_OPS(ti_pipe3_runtime_suspend,
 486                            ti_pipe3_runtime_resume, NULL)
 487 };
 488
 489 #define DEV_PM_OPS     (&ti_pipe3_pm_ops)
 490 #else
 491 #define DEV_PM_OPS     NULL
 492 #endif
 493
 494 #ifdef CONFIG_OF
 495 static const struct of_device_id ti_pipe3_id_table[] = {
 496         {
 497                 .compatible = "ti,phy-usb3",
 498                 .data = dpll_map_usb,
 499         },
 500         {
 501                 .compatible = "ti,omap-usb3",
 502                 .data = dpll_map_usb,
 503         },
 504         {
 505                 .compatible = "ti,phy-pipe3-sata",
 506                 .data = dpll_map_sata,
 507         },
 508         {
 509                 .compatible = "ti,phy-pipe3-pcie",
 510         },
 511         {}
 512 };
 513 MODULE_DEVICE_TABLE(of, ti_pipe3_id_table);
 514 #endif
 515
 516 static struct platform_driver ti_pipe3_driver = {
 517         .probe          = ti_pipe3_probe,
 518         .remove         = ti_pipe3_remove,
 519         .driver         = {
 520                 .name   = "ti-pipe3",
 521                 .pm     = DEV_PM_OPS,
 522                 .of_match_table = of_match_ptr(ti_pipe3_id_table),
 523         },
 524 };
 525
 526 module_platform_driver(ti_pipe3_driver);
 527
 528 MODULE_ALIAS("platform: ti_pipe3");
 529 MODULE_AUTHOR("Texas Instruments Inc.");
 530 MODULE_DESCRIPTION("TI PIPE3 phy driver");
 531 MODULE_LICENSE("GPL v2");