drivers/soc/bcm/bcm2835-power.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Power domain driver for Broadcom BCM2835
   4  *
   5  * Copyright (C) 2018 Broadcom
   6  */
   7
   8 #include <dt-bindings/soc/bcm2835-pm.h>
   9 #include <linux/clk.h>
  10 #include <linux/delay.h>
  11 #include <linux/io.h>
  12 #include <linux/mfd/bcm2835-pm.h>
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/pm_domain.h>
  16 #include <linux/reset-controller.h>
  17 #include <linux/types.h>
  18
  19 #define PM_GNRIC                        0x00
  20 #define PM_AUDIO                        0x04
  21 #define PM_STATUS                       0x18
  22 #define PM_RSTC                         0x1c
  23 #define PM_RSTS                         0x20
  24 #define PM_WDOG                         0x24
  25 #define PM_PADS0                        0x28
  26 #define PM_PADS2                        0x2c
  27 #define PM_PADS3                        0x30
  28 #define PM_PADS4                        0x34
  29 #define PM_PADS5                        0x38
  30 #define PM_PADS6                        0x3c
  31 #define PM_CAM0                         0x44
  32 #define PM_CAM0_LDOHPEN                 BIT(2)
  33 #define PM_CAM0_LDOLPEN                 BIT(1)
  34 #define PM_CAM0_CTRLEN                  BIT(0)
  35
  36 #define PM_CAM1                         0x48
  37 #define PM_CAM1_LDOHPEN                 BIT(2)
  38 #define PM_CAM1_LDOLPEN                 BIT(1)
  39 #define PM_CAM1_CTRLEN                  BIT(0)
  40
  41 #define PM_CCP2TX                       0x4c
  42 #define PM_CCP2TX_LDOEN                 BIT(1)
  43 #define PM_CCP2TX_CTRLEN                BIT(0)
  44
  45 #define PM_DSI0                         0x50
  46 #define PM_DSI0_LDOHPEN                 BIT(2)
  47 #define PM_DSI0_LDOLPEN                 BIT(1)
  48 #define PM_DSI0_CTRLEN                  BIT(0)
  49
  50 #define PM_DSI1                         0x54
  51 #define PM_DSI1_LDOHPEN                 BIT(2)
  52 #define PM_DSI1_LDOLPEN                 BIT(1)
  53 #define PM_DSI1_CTRLEN                  BIT(0)
  54
  55 #define PM_HDMI                         0x58
  56 #define PM_HDMI_RSTDR                   BIT(19)
  57 #define PM_HDMI_LDOPD                   BIT(1)
  58 #define PM_HDMI_CTRLEN                  BIT(0)
  59
  60 #define PM_USB                          0x5c
  61 /* The power gates must be enabled with this bit before enabling the LDO in the
  62  * USB block.
  63  */
  64 #define PM_USB_CTRLEN                   BIT(0)
  65
  66 #define PM_PXLDO                        0x60
  67 #define PM_PXBG                         0x64
  68 #define PM_DFT                          0x68
  69 #define PM_SMPS                         0x6c
  70 #define PM_XOSC                         0x70
  71 #define PM_SPAREW                       0x74
  72 #define PM_SPARER                       0x78
  73 #define PM_AVS_RSTDR                    0x7c
  74 #define PM_AVS_STAT                     0x80
  75 #define PM_AVS_EVENT                    0x84
  76 #define PM_AVS_INTEN                    0x88
  77 #define PM_DUMMY                        0xfc
  78
  79 #define PM_IMAGE                        0x108
  80 #define PM_GRAFX                        0x10c
  81 #define PM_PROC                         0x110
  82 #define PM_ENAB                         BIT(12)
  83 #define PM_ISPRSTN                      BIT(8)
  84 #define PM_H264RSTN                     BIT(7)
  85 #define PM_PERIRSTN                     BIT(6)
  86 #define PM_V3DRSTN                      BIT(6)
  87 #define PM_ISFUNC                       BIT(5)
  88 #define PM_MRDONE                       BIT(4)
  89 #define PM_MEMREP                       BIT(3)
  90 #define PM_ISPOW                        BIT(2)
  91 #define PM_POWOK                        BIT(1)
  92 #define PM_POWUP                        BIT(0)
  93 #define PM_INRUSH_SHIFT                 13
  94 #define PM_INRUSH_3_5_MA                0
  95 #define PM_INRUSH_5_MA                  1
  96 #define PM_INRUSH_10_MA                 2
  97 #define PM_INRUSH_20_MA                 3
  98 #define PM_INRUSH_MASK                  (3 << PM_INRUSH_SHIFT)
  99
 100 #define PM_PASSWORD                     0x5a000000
 101
 102 #define PM_WDOG_TIME_SET                0x000fffff
 103 #define PM_RSTC_WRCFG_CLR               0xffffffcf
 104 #define PM_RSTS_HADWRH_SET              0x00000040
 105 #define PM_RSTC_WRCFG_SET               0x00000030
 106 #define PM_RSTC_WRCFG_FULL_RESET        0x00000020
 107 #define PM_RSTC_RESET                   0x00000102
 108
 109 #define PM_READ(reg) readl(power->base + (reg))
 110 #define PM_WRITE(reg, val) writel(PM_PASSWORD | (val), power->base + (reg))
 111
 112 #define ASB_BRDG_VERSION                0x00
 113 #define ASB_CPR_CTRL                    0x04
 114
 115 #define ASB_V3D_S_CTRL                  0x08
 116 #define ASB_V3D_M_CTRL                  0x0c
 117 #define ASB_ISP_S_CTRL                  0x10
 118 #define ASB_ISP_M_CTRL                  0x14
 119 #define ASB_H264_S_CTRL                 0x18
 120 #define ASB_H264_M_CTRL                 0x1c
 121
 122 #define ASB_REQ_STOP                    BIT(0)
 123 #define ASB_ACK                         BIT(1)
 124 #define ASB_EMPTY                       BIT(2)
 125 #define ASB_FULL                        BIT(3)
 126
 127 #define ASB_AXI_BRDG_ID                 0x20
 128
 129 #define BCM2835_BRDG_ID                 0x62726467
 130
 131 struct bcm2835_power_domain {
 132         struct generic_pm_domain base;
 133         struct bcm2835_power *power;
 134         u32 domain;
 135         struct clk *clk;
 136 };
 137
 138 struct bcm2835_power {
 139         struct device           *dev;
 140         /* PM registers. */
 141         void __iomem            *base;
 142         /* AXI Async bridge registers. */
 143         void __iomem            *asb;
 144         /* RPiVid bridge registers. */
 145         void __iomem            *rpivid_asb;
 146
 147         struct genpd_onecell_data pd_xlate;
 148         struct bcm2835_power_domain domains[BCM2835_POWER_DOMAIN_COUNT];
 149         struct reset_controller_dev reset;
 150 };
 151
 152 static int bcm2835_asb_control(struct bcm2835_power *power, u32 reg, bool enable)
 153 {
 154         void __iomem *base = power->asb;
 155         u64 start;
 156         u32 val;
 157
 158         switch (reg) {
 159         case 0:
 160                 return 0;
 161         case ASB_V3D_S_CTRL:
 162         case ASB_V3D_M_CTRL:
 163                 if (power->rpivid_asb)
 164                         base = power->rpivid_asb;
 165                 break;
 166         }
 167
 168         start = ktime_get_ns();
 169
 170         /* Enable the module's async AXI bridges. */
 171         if (enable) {
 172                 val = readl(base + reg) & ~ASB_REQ_STOP;
 173         } else {
 174                 val = readl(base + reg) | ASB_REQ_STOP;
 175         }
 176         writel(PM_PASSWORD | val, base + reg);
 177
 178         while (readl(base + reg) & ASB_ACK) {
 179                 cpu_relax();
 180                 if (ktime_get_ns() - start >= 1000)
 181                         return -ETIMEDOUT;
 182         }
 183
 184         return 0;
 185 }
 186
 187 static int bcm2835_asb_enable(struct bcm2835_power *power, u32 reg)
 188 {
 189         return bcm2835_asb_control(power, reg, true);
 190 }
 191
 192 static int bcm2835_asb_disable(struct bcm2835_power *power, u32 reg)
 193 {
 194         return bcm2835_asb_control(power, reg, false);
 195 }
 196
 197 static int bcm2835_power_power_off(struct bcm2835_power_domain *pd, u32 pm_reg)
 198 {
 199         struct bcm2835_power *power = pd->power;
 200
 201         /* We don't run this on BCM2711 */
 202         if (power->rpivid_asb)
 203                 return 0;
 204
 205         /* Enable functional isolation */
 206         PM_WRITE(pm_reg, PM_READ(pm_reg) & ~PM_ISFUNC);
 207
 208         /* Enable electrical isolation */
 209         PM_WRITE(pm_reg, PM_READ(pm_reg) & ~PM_ISPOW);
 210
 211         /* Open the power switches. */
 212         PM_WRITE(pm_reg, PM_READ(pm_reg) & ~PM_POWUP);
 213
 214         return 0;
 215 }
 216
 217 static int bcm2835_power_power_on(struct bcm2835_power_domain *pd, u32 pm_reg)
 218 {
 219         struct bcm2835_power *power = pd->power;
 220         struct device *dev = power->dev;
 221         u64 start;
 222         int ret;
 223         int inrush;
 224         bool powok;
 225
 226         /* We don't run this on BCM2711 */
 227         if (power->rpivid_asb)
 228                 return 0;
 229
 230         /* If it was already powered on by the fw, leave it that way. */
 231         if (PM_READ(pm_reg) & PM_POWUP)
 232                 return 0;
 233
 234         /* Enable power.  Allowing too much current at once may result
 235          * in POWOK never getting set, so start low and ramp it up as
 236          * necessary to succeed.
 237          */
 238         powok = false;
 239         for (inrush = PM_INRUSH_3_5_MA; inrush <= PM_INRUSH_20_MA; inrush++) {
 240                 PM_WRITE(pm_reg,
 241                          (PM_READ(pm_reg) & ~PM_INRUSH_MASK) |
 242                          (inrush << PM_INRUSH_SHIFT) |
 243                          PM_POWUP);
 244
 245                 start = ktime_get_ns();
 246                 while (!(powok = !!(PM_READ(pm_reg) & PM_POWOK))) {
 247                         cpu_relax();
 248                         if (ktime_get_ns() - start >= 3000)
 249                                 break;
 250                 }
 251         }
 252         if (!powok) {
 253                 dev_err(dev, "Timeout waiting for %s power OK\n",
 254                         pd->base.name);
 255                 ret = -ETIMEDOUT;
 256                 goto err_disable_powup;
 257         }
 258
 259         /* Disable electrical isolation */
 260         PM_WRITE(pm_reg, PM_READ(pm_reg) | PM_ISPOW);
 261
 262         /* Repair memory */
 263         PM_WRITE(pm_reg, PM_READ(pm_reg) | PM_MEMREP);
 264         start = ktime_get_ns();
 265         while (!(PM_READ(pm_reg) & PM_MRDONE)) {
 266                 cpu_relax();
 267                 if (ktime_get_ns() - start >= 1000) {
 268                         dev_err(dev, "Timeout waiting for %s memory repair\n",
 269                                 pd->base.name);
 270                         ret = -ETIMEDOUT;
 271                         goto err_disable_ispow;
 272                 }
 273         }
 274
 275         /* Disable functional isolation */
 276         PM_WRITE(pm_reg, PM_READ(pm_reg) | PM_ISFUNC);
 277
 278         return 0;
 279
 280 err_disable_ispow:
 281         PM_WRITE(pm_reg, PM_READ(pm_reg) & ~PM_ISPOW);
 282 err_disable_powup:
 283         PM_WRITE(pm_reg, PM_READ(pm_reg) & ~(PM_POWUP | PM_INRUSH_MASK));
 284         return ret;
 285 }
 286
 287 static int bcm2835_asb_power_on(struct bcm2835_power_domain *pd,
 288                                 u32 pm_reg,
 289                                 u32 asb_m_reg,
 290                                 u32 asb_s_reg,
 291                                 u32 reset_flags)
 292 {
 293         struct bcm2835_power *power = pd->power;
 294         int ret;
 295
 296         ret = clk_prepare_enable(pd->clk);
 297         if (ret) {
 298                 dev_err(power->dev, "Failed to enable clock for %s\n",
 299                         pd->base.name);
 300                 return ret;
 301         }
 302
 303         /* Wait 32 clocks for reset to propagate, 1 us will be enough */
 304         udelay(1);
 305
 306         clk_disable_unprepare(pd->clk);
 307
 308         /* Deassert the resets. */
 309         PM_WRITE(pm_reg, PM_READ(pm_reg) | reset_flags);
 310
 311         ret = clk_prepare_enable(pd->clk);
 312         if (ret) {
 313                 dev_err(power->dev, "Failed to enable clock for %s\n",
 314                         pd->base.name);
 315                 goto err_enable_resets;
 316         }
 317
 318         ret = bcm2835_asb_enable(power, asb_m_reg);
 319         if (ret) {
 320                 dev_err(power->dev, "Failed to enable ASB master for %s\n",
 321                         pd->base.name);
 322                 goto err_disable_clk;
 323         }
 324         ret = bcm2835_asb_enable(power, asb_s_reg);
 325         if (ret) {
 326                 dev_err(power->dev, "Failed to enable ASB slave for %s\n",
 327                         pd->base.name);
 328                 goto err_disable_asb_master;
 329         }
 330
 331         return 0;
 332
 333 err_disable_asb_master:
 334         bcm2835_asb_disable(power, asb_m_reg);
 335 err_disable_clk:
 336         clk_disable_unprepare(pd->clk);
 337 err_enable_resets:
 338         PM_WRITE(pm_reg, PM_READ(pm_reg) & ~reset_flags);
 339         return ret;
 340 }
 341
 342 static int bcm2835_asb_power_off(struct bcm2835_power_domain *pd,
 343                                  u32 pm_reg,
 344                                  u32 asb_m_reg,
 345                                  u32 asb_s_reg,
 346                                  u32 reset_flags)
 347 {
 348         struct bcm2835_power *power = pd->power;
 349         int ret;
 350
 351         ret = bcm2835_asb_disable(power, asb_s_reg);
 352         if (ret) {
 353                 dev_warn(power->dev, "Failed to disable ASB slave for %s\n",
 354                          pd->base.name);
 355                 return ret;
 356         }
 357         ret = bcm2835_asb_disable(power, asb_m_reg);
 358         if (ret) {
 359                 dev_warn(power->dev, "Failed to disable ASB master for %s\n",
 360                          pd->base.name);
 361                 bcm2835_asb_enable(power, asb_s_reg);
 362                 return ret;
 363         }
 364
 365         clk_disable_unprepare(pd->clk);
 366
 367         /* Assert the resets. */
 368         PM_WRITE(pm_reg, PM_READ(pm_reg) & ~reset_flags);
 369
 370         return 0;
 371 }
 372
 373 static int bcm2835_power_pd_power_on(struct generic_pm_domain *domain)
 374 {
 375         struct bcm2835_power_domain *pd =
 376                 container_of(domain, struct bcm2835_power_domain, base);
 377         struct bcm2835_power *power = pd->power;
 378
 379         switch (pd->domain) {
 380         case BCM2835_POWER_DOMAIN_GRAFX:
 381                 return bcm2835_power_power_on(pd, PM_GRAFX);
 382
 383         case BCM2835_POWER_DOMAIN_GRAFX_V3D:
 384                 return bcm2835_asb_power_on(pd, PM_GRAFX,
 385                                             ASB_V3D_M_CTRL, ASB_V3D_S_CTRL,
 386                                             PM_V3DRSTN);
 387
 388         case BCM2835_POWER_DOMAIN_IMAGE:
 389                 return bcm2835_power_power_on(pd, PM_IMAGE);
 390
 391         case BCM2835_POWER_DOMAIN_IMAGE_PERI:
 392                 return bcm2835_asb_power_on(pd, PM_IMAGE,
 393                                             0, 0,
 394                                             PM_PERIRSTN);
 395
 396         case BCM2835_POWER_DOMAIN_IMAGE_ISP:
 397                 return bcm2835_asb_power_on(pd, PM_IMAGE,
 398                                             ASB_ISP_M_CTRL, ASB_ISP_S_CTRL,
 399                                             PM_ISPRSTN);
 400
 401         case BCM2835_POWER_DOMAIN_IMAGE_H264:
 402                 return bcm2835_asb_power_on(pd, PM_IMAGE,
 403                                             ASB_H264_M_CTRL, ASB_H264_S_CTRL,
 404                                             PM_H264RSTN);
 405
 406         case BCM2835_POWER_DOMAIN_USB:
 407                 PM_WRITE(PM_USB, PM_USB_CTRLEN);
 408                 return 0;
 409
 410         case BCM2835_POWER_DOMAIN_DSI0:
 411                 PM_WRITE(PM_DSI0, PM_DSI0_CTRLEN);
 412                 PM_WRITE(PM_DSI0, PM_DSI0_CTRLEN | PM_DSI0_LDOHPEN);
 413                 return 0;
 414
 415         case BCM2835_POWER_DOMAIN_DSI1:
 416                 PM_WRITE(PM_DSI1, PM_DSI1_CTRLEN);
 417                 PM_WRITE(PM_DSI1, PM_DSI1_CTRLEN | PM_DSI1_LDOHPEN);
 418                 return 0;
 419
 420         case BCM2835_POWER_DOMAIN_CCP2TX:
 421                 PM_WRITE(PM_CCP2TX, PM_CCP2TX_CTRLEN);
 422                 PM_WRITE(PM_CCP2TX, PM_CCP2TX_CTRLEN | PM_CCP2TX_LDOEN);
 423                 return 0;
 424
 425         case BCM2835_POWER_DOMAIN_HDMI:
 426                 PM_WRITE(PM_HDMI, PM_READ(PM_HDMI) | PM_HDMI_RSTDR);
 427                 PM_WRITE(PM_HDMI, PM_READ(PM_HDMI) | PM_HDMI_CTRLEN);
 428                 PM_WRITE(PM_HDMI, PM_READ(PM_HDMI) & ~PM_HDMI_LDOPD);
 429                 usleep_range(100, 200);
 430                 PM_WRITE(PM_HDMI, PM_READ(PM_HDMI) & ~PM_HDMI_RSTDR);
 431                 return 0;
 432
 433         default:
 434                 dev_err(power->dev, "Invalid domain %d\n", pd->domain);
 435                 return -EINVAL;
 436         }
 437 }
 438
 439 static int bcm2835_power_pd_power_off(struct generic_pm_domain *domain)
 440 {
 441         struct bcm2835_power_domain *pd =
 442                 container_of(domain, struct bcm2835_power_domain, base);
 443         struct bcm2835_power *power = pd->power;
 444
 445         switch (pd->domain) {
 446         case BCM2835_POWER_DOMAIN_GRAFX:
 447                 return bcm2835_power_power_off(pd, PM_GRAFX);
 448
 449         case BCM2835_POWER_DOMAIN_GRAFX_V3D:
 450                 return bcm2835_asb_power_off(pd, PM_GRAFX,
 451                                              ASB_V3D_M_CTRL, ASB_V3D_S_CTRL,
 452                                              PM_V3DRSTN);
 453
 454         case BCM2835_POWER_DOMAIN_IMAGE:
 455                 return bcm2835_power_power_off(pd, PM_IMAGE);
 456
 457         case BCM2835_POWER_DOMAIN_IMAGE_PERI:
 458                 return bcm2835_asb_power_off(pd, PM_IMAGE,
 459                                              0, 0,
 460                                              PM_PERIRSTN);
 461
 462         case BCM2835_POWER_DOMAIN_IMAGE_ISP:
 463                 return bcm2835_asb_power_off(pd, PM_IMAGE,
 464                                              ASB_ISP_M_CTRL, ASB_ISP_S_CTRL,
 465                                              PM_ISPRSTN);
 466
 467         case BCM2835_POWER_DOMAIN_IMAGE_H264:
 468                 return bcm2835_asb_power_off(pd, PM_IMAGE,
 469                                              ASB_H264_M_CTRL, ASB_H264_S_CTRL,
 470                                              PM_H264RSTN);
 471
 472         case BCM2835_POWER_DOMAIN_USB:
 473                 PM_WRITE(PM_USB, 0);
 474                 return 0;
 475
 476         case BCM2835_POWER_DOMAIN_DSI0:
 477                 PM_WRITE(PM_DSI0, PM_DSI0_CTRLEN);
 478                 PM_WRITE(PM_DSI0, 0);
 479                 return 0;
 480
 481         case BCM2835_POWER_DOMAIN_DSI1:
 482                 PM_WRITE(PM_DSI1, PM_DSI1_CTRLEN);
 483                 PM_WRITE(PM_DSI1, 0);
 484                 return 0;
 485
 486         case BCM2835_POWER_DOMAIN_CCP2TX:
 487                 PM_WRITE(PM_CCP2TX, PM_CCP2TX_CTRLEN);
 488                 PM_WRITE(PM_CCP2TX, 0);
 489                 return 0;
 490
 491         case BCM2835_POWER_DOMAIN_HDMI:
 492                 PM_WRITE(PM_HDMI, PM_READ(PM_HDMI) | PM_HDMI_LDOPD);
 493                 PM_WRITE(PM_HDMI, PM_READ(PM_HDMI) & ~PM_HDMI_CTRLEN);
 494                 return 0;
 495
 496         default:
 497                 dev_err(power->dev, "Invalid domain %d\n", pd->domain);
 498                 return -EINVAL;
 499         }
 500 }
 501
 502 static int
 503 bcm2835_init_power_domain(struct bcm2835_power *power,
 504                           int pd_xlate_index, const char *name)
 505 {
 506         struct device *dev = power->dev;
 507         struct bcm2835_power_domain *dom = &power->domains[pd_xlate_index];
 508
 509         dom->clk = devm_clk_get(dev->parent, name);
 510         if (IS_ERR(dom->clk)) {
 511                 int ret = PTR_ERR(dom->clk);
 512
 513                 if (ret == -EPROBE_DEFER)
 514                         return ret;
 515
 516                 /* Some domains don't have a clk, so make sure that we
 517                  * don't deref an error pointer later.
 518                  */
 519                 dom->clk = NULL;
 520         }
 521
 522         dom->base.name = name;
 523         dom->base.power_on = bcm2835_power_pd_power_on;
 524         dom->base.power_off = bcm2835_power_pd_power_off;
 525
 526         dom->domain = pd_xlate_index;
 527         dom->power = power;
 528
 529         /* XXX: on/off at boot? */
 530         pm_genpd_init(&dom->base, NULL, true);
 531
 532         power->pd_xlate.domains[pd_xlate_index] = &dom->base;
 533
 534         return 0;
 535 }
 536
 537 /** bcm2835_reset_reset - Resets a block that has a reset line in the
 538  * PM block.
 539  *
 540  * The consumer of the reset controller must have the power domain up
 541  * -- there's no reset ability with the power domain down.  To reset
 542  * the sub-block, we just disable its access to memory through the
 543  * ASB, reset, and re-enable.
 544  */
 545 static int bcm2835_reset_reset(struct reset_controller_dev *rcdev,
 546                                unsigned long id)
 547 {
 548         struct bcm2835_power *power = container_of(rcdev, struct bcm2835_power,
 549                                                    reset);
 550         struct bcm2835_power_domain *pd;
 551         int ret;
 552
 553         switch (id) {
 554         case BCM2835_RESET_V3D:
 555                 pd = &power->domains[BCM2835_POWER_DOMAIN_GRAFX_V3D];
 556                 break;
 557         case BCM2835_RESET_H264:
 558                 pd = &power->domains[BCM2835_POWER_DOMAIN_IMAGE_H264];
 559                 break;
 560         case BCM2835_RESET_ISP:
 561                 pd = &power->domains[BCM2835_POWER_DOMAIN_IMAGE_ISP];
 562                 break;
 563         default:
 564                 dev_err(power->dev, "Bad reset id %ld\n", id);
 565                 return -EINVAL;
 566         }
 567
 568         ret = bcm2835_power_pd_power_off(&pd->base);
 569         if (ret)
 570                 return ret;
 571
 572         return bcm2835_power_pd_power_on(&pd->base);
 573 }
 574
 575 static int bcm2835_reset_status(struct reset_controller_dev *rcdev,
 576                                 unsigned long id)
 577 {
 578         struct bcm2835_power *power = container_of(rcdev, struct bcm2835_power,
 579                                                    reset);
 580
 581         switch (id) {
 582         case BCM2835_RESET_V3D:
 583                 return !PM_READ(PM_GRAFX & PM_V3DRSTN);
 584         case BCM2835_RESET_H264:
 585                 return !PM_READ(PM_IMAGE & PM_H264RSTN);
 586         case BCM2835_RESET_ISP:
 587                 return !PM_READ(PM_IMAGE & PM_ISPRSTN);
 588         default:
 589                 return -EINVAL;
 590         }
 591 }
 592
 593 static const struct reset_control_ops bcm2835_reset_ops = {
 594         .reset = bcm2835_reset_reset,
 595         .status = bcm2835_reset_status,
 596 };
 597
 598 static const char *const power_domain_names[] = {
 599         [BCM2835_POWER_DOMAIN_GRAFX] = "grafx",
 600         [BCM2835_POWER_DOMAIN_GRAFX_V3D] = "v3d",
 601
 602         [BCM2835_POWER_DOMAIN_IMAGE] = "image",
 603         [BCM2835_POWER_DOMAIN_IMAGE_PERI] = "peri_image",
 604         [BCM2835_POWER_DOMAIN_IMAGE_H264] = "h264",
 605         [BCM2835_POWER_DOMAIN_IMAGE_ISP] = "isp",
 606
 607         [BCM2835_POWER_DOMAIN_USB] = "usb",
 608         [BCM2835_POWER_DOMAIN_DSI0] = "dsi0",
 609         [BCM2835_POWER_DOMAIN_DSI1] = "dsi1",
 610         [BCM2835_POWER_DOMAIN_CAM0] = "cam0",
 611         [BCM2835_POWER_DOMAIN_CAM1] = "cam1",
 612         [BCM2835_POWER_DOMAIN_CCP2TX] = "ccp2tx",
 613         [BCM2835_POWER_DOMAIN_HDMI] = "hdmi",
 614 };
 615
 616 static int bcm2835_power_probe(struct platform_device *pdev)
 617 {
 618         struct bcm2835_pm *pm = dev_get_drvdata(pdev->dev.parent);
 619         struct device *dev = &pdev->dev;
 620         struct bcm2835_power *power;
 621         static const struct {
 622                 int parent, child;
 623         } domain_deps[] = {
 624                 { BCM2835_POWER_DOMAIN_GRAFX, BCM2835_POWER_DOMAIN_GRAFX_V3D },
 625                 { BCM2835_POWER_DOMAIN_IMAGE, BCM2835_POWER_DOMAIN_IMAGE_PERI },
 626                 { BCM2835_POWER_DOMAIN_IMAGE, BCM2835_POWER_DOMAIN_IMAGE_H264 },
 627                 { BCM2835_POWER_DOMAIN_IMAGE, BCM2835_POWER_DOMAIN_IMAGE_ISP },
 628                 { BCM2835_POWER_DOMAIN_IMAGE_PERI, BCM2835_POWER_DOMAIN_USB },
 629                 { BCM2835_POWER_DOMAIN_IMAGE_PERI, BCM2835_POWER_DOMAIN_CAM0 },
 630                 { BCM2835_POWER_DOMAIN_IMAGE_PERI, BCM2835_POWER_DOMAIN_CAM1 },
 631         };
 632         int ret = 0, i;
 633         u32 id;
 634
 635         power = devm_kzalloc(dev, sizeof(*power), GFP_KERNEL);
 636         if (!power)
 637                 return -ENOMEM;
 638         platform_set_drvdata(pdev, power);
 639
 640         power->dev = dev;
 641         power->base = pm->base;
 642         power->asb = pm->asb;
 643         power->rpivid_asb = pm->rpivid_asb;
 644
 645         id = readl(power->asb + ASB_AXI_BRDG_ID);
 646         if (id != BCM2835_BRDG_ID /* "BRDG" */) {
 647                 dev_err(dev, "ASB register ID returned 0x%08x\n", id);
 648                 return -ENODEV;
 649         }
 650
 651         if (power->rpivid_asb) {
 652                 id = readl(power->rpivid_asb + ASB_AXI_BRDG_ID);
 653                 if (id != BCM2835_BRDG_ID /* "BRDG" */) {
 654                         dev_err(dev, "RPiVid ASB register ID returned 0x%08x\n",
 655                                      id);
 656                         return -ENODEV;
 657                 }
 658         }
 659
 660         power->pd_xlate.domains = devm_kcalloc(dev,
 661                                                ARRAY_SIZE(power_domain_names),
 662                                                sizeof(*power->pd_xlate.domains),
 663                                                GFP_KERNEL);
 664         if (!power->pd_xlate.domains)
 665                 return -ENOMEM;
 666
 667         power->pd_xlate.num_domains = ARRAY_SIZE(power_domain_names);
 668
 669         for (i = 0; i < ARRAY_SIZE(power_domain_names); i++) {
 670                 ret = bcm2835_init_power_domain(power, i, power_domain_names[i]);
 671                 if (ret)
 672                         goto fail;
 673         }
 674
 675         for (i = 0; i < ARRAY_SIZE(domain_deps); i++) {
 676                 pm_genpd_add_subdomain(&power->domains[domain_deps[i].parent].base,
 677                                        &power->domains[domain_deps[i].child].base);
 678         }
 679
 680         power->reset.owner = THIS_MODULE;
 681         power->reset.nr_resets = BCM2835_RESET_COUNT;
 682         power->reset.ops = &bcm2835_reset_ops;
 683         power->reset.of_node = dev->parent->of_node;
 684
 685         ret = devm_reset_controller_register(dev, &power->reset);
 686         if (ret)
 687                 goto fail;
 688
 689         of_genpd_add_provider_onecell(dev->parent->of_node, &power->pd_xlate);
 690
 691         dev_info(dev, "Broadcom BCM2835 power domains driver");
 692         return 0;
 693
 694 fail:
 695         for (i = 0; i < ARRAY_SIZE(power_domain_names); i++) {
 696                 struct generic_pm_domain *dom = &power->domains[i].base;
 697
 698                 if (dom->name)
 699                         pm_genpd_remove(dom);
 700         }
 701         return ret;
 702 }
 703
 704 static struct platform_driver bcm2835_power_driver = {
 705         .probe          = bcm2835_power_probe,
 706         .driver = {
 707                 .name = "bcm2835-power",
 708         },
 709 };
 710 module_platform_driver(bcm2835_power_driver);
 711
 712 MODULE_AUTHOR("Eric Anholt <[email protected]>");
 713 MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM power domains and reset");