drivers/soc/imx/imx8m-blk-ctrl.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2
   3 /*
   4  * Copyright 2021 Pengutronix, Lucas Stach <[email protected]>
   5  */
   6
   7 #include <linux/bitfield.h>
   8 #include <linux/device.h>
   9 #include <linux/interconnect.h>
  10 #include <linux/module.h>
  11 #include <linux/of_device.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/pm_domain.h>
  14 #include <linux/pm_runtime.h>
  15 #include <linux/regmap.h>
  16 #include <linux/clk.h>
  17
  18 #include <dt-bindings/power/imx8mm-power.h>
  19 #include <dt-bindings/power/imx8mn-power.h>
  20 #include <dt-bindings/power/imx8mp-power.h>
  21 #include <dt-bindings/power/imx8mq-power.h>
  22
  23 #define BLK_SFT_RSTN    0x0
  24 #define BLK_CLK_EN      0x4
  25 #define BLK_MIPI_RESET_DIV      0x8 /* Mini/Nano/Plus DISPLAY_BLK_CTRL only */
  26
  27 struct imx8m_blk_ctrl_domain;
  28
  29 struct imx8m_blk_ctrl {
  30         struct device *dev;
  31         struct notifier_block power_nb;
  32         struct device *bus_power_dev;
  33         struct regmap *regmap;
  34         struct imx8m_blk_ctrl_domain *domains;
  35         struct genpd_onecell_data onecell_data;
  36 };
  37
  38 struct imx8m_blk_ctrl_domain_data {
  39         const char *name;
  40         const char * const *clk_names;
  41         const char * const *path_names;
  42         const char *gpc_name;
  43         int num_clks;
  44         int num_paths;
  45         u32 rst_mask;
  46         u32 clk_mask;
  47
  48         /*
  49          * i.MX8M Mini, Nano and Plus have a third DISPLAY_BLK_CTRL register
  50          * which is used to control the reset for the MIPI Phy.
  51          * Since it's only present in certain circumstances,
  52          * an if-statement should be used before setting and clearing this
  53          * register.
  54          */
  55         u32 mipi_phy_rst_mask;
  56 };
  57
  58 #define DOMAIN_MAX_CLKS 4
  59 #define DOMAIN_MAX_PATHS 4
  60
  61 struct imx8m_blk_ctrl_domain {
  62         struct generic_pm_domain genpd;
  63         const struct imx8m_blk_ctrl_domain_data *data;
  64         struct clk_bulk_data clks[DOMAIN_MAX_CLKS];
  65         struct icc_bulk_data paths[DOMAIN_MAX_PATHS];
  66         struct device *power_dev;
  67         struct imx8m_blk_ctrl *bc;
  68         int num_paths;
  69 };
  70
  71 struct imx8m_blk_ctrl_data {
  72         int max_reg;
  73         notifier_fn_t power_notifier_fn;
  74         const struct imx8m_blk_ctrl_domain_data *domains;
  75         int num_domains;
  76 };
  77
  78 static inline struct imx8m_blk_ctrl_domain *
  79 to_imx8m_blk_ctrl_domain(struct generic_pm_domain *genpd)
  80 {
  81         return container_of(genpd, struct imx8m_blk_ctrl_domain, genpd);
  82 }
  83
  84 static int imx8m_blk_ctrl_power_on(struct generic_pm_domain *genpd)
  85 {
  86         struct imx8m_blk_ctrl_domain *domain = to_imx8m_blk_ctrl_domain(genpd);
  87         const struct imx8m_blk_ctrl_domain_data *data = domain->data;
  88         struct imx8m_blk_ctrl *bc = domain->bc;
  89         int ret;
  90
  91         /* make sure bus domain is awake */
  92         ret = pm_runtime_get_sync(bc->bus_power_dev);
  93         if (ret < 0) {
  94                 pm_runtime_put_noidle(bc->bus_power_dev);
  95                 dev_err(bc->dev, "failed to power up bus domain\n");
  96                 return ret;
  97         }
  98
  99         /* put devices into reset */
 100         regmap_clear_bits(bc->regmap, BLK_SFT_RSTN, data->rst_mask);
 101         if (data->mipi_phy_rst_mask)
 102                 regmap_clear_bits(bc->regmap, BLK_MIPI_RESET_DIV, data->mipi_phy_rst_mask);
 103
 104         /* enable upstream and blk-ctrl clocks to allow reset to propagate */
 105         ret = clk_bulk_prepare_enable(data->num_clks, domain->clks);
 106         if (ret) {
 107                 dev_err(bc->dev, "failed to enable clocks\n");
 108                 goto bus_put;
 109         }
 110         regmap_set_bits(bc->regmap, BLK_CLK_EN, data->clk_mask);
 111
 112         /* power up upstream GPC domain */
 113         ret = pm_runtime_get_sync(domain->power_dev);
 114         if (ret < 0) {
 115                 dev_err(bc->dev, "failed to power up peripheral domain\n");
 116                 goto clk_disable;
 117         }
 118
 119         /* wait for reset to propagate */
 120         udelay(5);
 121
 122         /* release reset */
 123         regmap_set_bits(bc->regmap, BLK_SFT_RSTN, data->rst_mask);
 124         if (data->mipi_phy_rst_mask)
 125                 regmap_set_bits(bc->regmap, BLK_MIPI_RESET_DIV, data->mipi_phy_rst_mask);
 126
 127         ret = icc_bulk_set_bw(domain->num_paths, domain->paths);
 128         if (ret)
 129                 dev_err(bc->dev, "failed to set icc bw\n");
 130
 131         /* disable upstream clocks */
 132         clk_bulk_disable_unprepare(data->num_clks, domain->clks);
 133
 134         return 0;
 135
 136 clk_disable:
 137         clk_bulk_disable_unprepare(data->num_clks, domain->clks);
 138 bus_put:
 139         pm_runtime_put(bc->bus_power_dev);
 140
 141         return ret;
 142 }
 143
 144 static int imx8m_blk_ctrl_power_off(struct generic_pm_domain *genpd)
 145 {
 146         struct imx8m_blk_ctrl_domain *domain = to_imx8m_blk_ctrl_domain(genpd);
 147         const struct imx8m_blk_ctrl_domain_data *data = domain->data;
 148         struct imx8m_blk_ctrl *bc = domain->bc;
 149
 150         /* put devices into reset and disable clocks */
 151         if (data->mipi_phy_rst_mask)
 152                 regmap_clear_bits(bc->regmap, BLK_MIPI_RESET_DIV, data->mipi_phy_rst_mask);
 153
 154         regmap_clear_bits(bc->regmap, BLK_SFT_RSTN, data->rst_mask);
 155         regmap_clear_bits(bc->regmap, BLK_CLK_EN, data->clk_mask);
 156
 157         /* power down upstream GPC domain */
 158         pm_runtime_put(domain->power_dev);
 159
 160         /* allow bus domain to suspend */
 161         pm_runtime_put(bc->bus_power_dev);
 162
 163         return 0;
 164 }
 165
 166 static struct lock_class_key blk_ctrl_genpd_lock_class;
 167
 168 static int imx8m_blk_ctrl_probe(struct platform_device *pdev)
 169 {
 170         const struct imx8m_blk_ctrl_data *bc_data;
 171         struct device *dev = &pdev->dev;
 172         struct imx8m_blk_ctrl *bc;
 173         void __iomem *base;
 174         int i, ret;
 175
 176         struct regmap_config regmap_config = {
 177                 .reg_bits       = 32,
 178                 .val_bits       = 32,
 179                 .reg_stride     = 4,
 180         };
 181
 182         bc = devm_kzalloc(dev, sizeof(*bc), GFP_KERNEL);
 183         if (!bc)
 184                 return -ENOMEM;
 185
 186         bc->dev = dev;
 187
 188         bc_data = of_device_get_match_data(dev);
 189
 190         base = devm_platform_ioremap_resource(pdev, 0);
 191         if (IS_ERR(base))
 192                 return PTR_ERR(base);
 193
 194         regmap_config.max_register = bc_data->max_reg;
 195         bc->regmap = devm_regmap_init_mmio(dev, base, &regmap_config);
 196         if (IS_ERR(bc->regmap))
 197                 return dev_err_probe(dev, PTR_ERR(bc->regmap),
 198                                      "failed to init regmap\n");
 199
 200         bc->domains = devm_kcalloc(dev, bc_data->num_domains,
 201                                    sizeof(struct imx8m_blk_ctrl_domain),
 202                                    GFP_KERNEL);
 203         if (!bc->domains)
 204                 return -ENOMEM;
 205
 206         bc->onecell_data.num_domains = bc_data->num_domains;
 207         bc->onecell_data.domains =
 208                 devm_kcalloc(dev, bc_data->num_domains,
 209                              sizeof(struct generic_pm_domain *), GFP_KERNEL);
 210         if (!bc->onecell_data.domains)
 211                 return -ENOMEM;
 212
 213         bc->bus_power_dev = dev_pm_domain_attach_by_name(dev, "bus");
 214         if (IS_ERR(bc->bus_power_dev)) {
 215                 if (PTR_ERR(bc->bus_power_dev) == -ENODEV)
 216                         return dev_err_probe(dev, -EPROBE_DEFER,
 217                                              "failed to attach power domain \"bus\"\n");
 218                 else
 219                         return dev_err_probe(dev, PTR_ERR(bc->bus_power_dev),
 220                                              "failed to attach power domain \"bus\"\n");
 221         }
 222
 223         for (i = 0; i < bc_data->num_domains; i++) {
 224                 const struct imx8m_blk_ctrl_domain_data *data = &bc_data->domains[i];
 225                 struct imx8m_blk_ctrl_domain *domain = &bc->domains[i];
 226                 int j;
 227
 228                 domain->data = data;
 229                 domain->num_paths = data->num_paths;
 230
 231                 for (j = 0; j < data->num_clks; j++)
 232                         domain->clks[j].id = data->clk_names[j];
 233
 234                 for (j = 0; j < data->num_paths; j++) {
 235                         domain->paths[j].name = data->path_names[j];
 236                         /* Fake value for now, just let ICC could configure NoC mode/priority */
 237                         domain->paths[j].avg_bw = 1;
 238                         domain->paths[j].peak_bw = 1;
 239                 }
 240
 241                 ret = devm_of_icc_bulk_get(dev, data->num_paths, domain->paths);
 242                 if (ret) {
 243                         if (ret != -EPROBE_DEFER) {
 244                                 dev_warn_once(dev, "Could not get interconnect paths, NoC will stay unconfigured!\n");
 245                                 domain->num_paths = 0;
 246                         } else {
 247                                 dev_err_probe(dev, ret, "failed to get noc entries\n");
 248                                 goto cleanup_pds;
 249                         }
 250                 }
 251
 252                 ret = devm_clk_bulk_get(dev, data->num_clks, domain->clks);
 253                 if (ret) {
 254                         dev_err_probe(dev, ret, "failed to get clock\n");
 255                         goto cleanup_pds;
 256                 }
 257
 258                 domain->power_dev =
 259                         dev_pm_domain_attach_by_name(dev, data->gpc_name);
 260                 if (IS_ERR(domain->power_dev)) {
 261                         dev_err_probe(dev, PTR_ERR(domain->power_dev),
 262                                       "failed to attach power domain \"%s\"\n",
 263                                       data->gpc_name);
 264                         ret = PTR_ERR(domain->power_dev);
 265                         goto cleanup_pds;
 266                 }
 267
 268                 domain->genpd.name = data->name;
 269                 domain->genpd.power_on = imx8m_blk_ctrl_power_on;
 270                 domain->genpd.power_off = imx8m_blk_ctrl_power_off;
 271                 domain->bc = bc;
 272
 273                 ret = pm_genpd_init(&domain->genpd, NULL, true);
 274                 if (ret) {
 275                         dev_err_probe(dev, ret,
 276                                       "failed to init power domain \"%s\"\n",
 277                                       data->gpc_name);
 278                         dev_pm_domain_detach(domain->power_dev, true);
 279                         goto cleanup_pds;
 280                 }
 281
 282                 /*
 283                  * We use runtime PM to trigger power on/off of the upstream GPC
 284                  * domain, as a strict hierarchical parent/child power domain
 285                  * setup doesn't allow us to meet the sequencing requirements.
 286                  * This means we have nested locking of genpd locks, without the
 287                  * nesting being visible at the genpd level, so we need a
 288                  * separate lock class to make lockdep aware of the fact that
 289                  * this are separate domain locks that can be nested without a
 290                  * self-deadlock.
 291                  */
 292                 lockdep_set_class(&domain->genpd.mlock,
 293                                   &blk_ctrl_genpd_lock_class);
 294
 295                 bc->onecell_data.domains[i] = &domain->genpd;
 296         }
 297
 298         ret = of_genpd_add_provider_onecell(dev->of_node, &bc->onecell_data);
 299         if (ret) {
 300                 dev_err_probe(dev, ret, "failed to add power domain provider\n");
 301                 goto cleanup_pds;
 302         }
 303
 304         bc->power_nb.notifier_call = bc_data->power_notifier_fn;
 305         ret = dev_pm_genpd_add_notifier(bc->bus_power_dev, &bc->power_nb);
 306         if (ret) {
 307                 dev_err_probe(dev, ret, "failed to add power notifier\n");
 308                 goto cleanup_provider;
 309         }
 310
 311         dev_set_drvdata(dev, bc);
 312
 313         ret = devm_of_platform_populate(dev);
 314         if (ret)
 315                 goto cleanup_provider;
 316
 317         return 0;
 318
 319 cleanup_provider:
 320         of_genpd_del_provider(dev->of_node);
 321 cleanup_pds:
 322         for (i--; i >= 0; i--) {
 323                 pm_genpd_remove(&bc->domains[i].genpd);
 324                 dev_pm_domain_detach(bc->domains[i].power_dev, true);
 325         }
 326
 327         dev_pm_domain_detach(bc->bus_power_dev, true);
 328
 329         return ret;
 330 }
 331
 332 static int imx8m_blk_ctrl_remove(struct platform_device *pdev)
 333 {
 334         struct imx8m_blk_ctrl *bc = dev_get_drvdata(&pdev->dev);
 335         int i;
 336
 337         of_genpd_del_provider(pdev->dev.of_node);
 338
 339         for (i = 0; bc->onecell_data.num_domains; i++) {
 340                 struct imx8m_blk_ctrl_domain *domain = &bc->domains[i];
 341
 342                 pm_genpd_remove(&domain->genpd);
 343                 dev_pm_domain_detach(domain->power_dev, true);
 344         }
 345
 346         dev_pm_genpd_remove_notifier(bc->bus_power_dev);
 347
 348         dev_pm_domain_detach(bc->bus_power_dev, true);
 349
 350         return 0;
 351 }
 352
 353 #ifdef CONFIG_PM_SLEEP
 354 static int imx8m_blk_ctrl_suspend(struct device *dev)
 355 {
 356         struct imx8m_blk_ctrl *bc = dev_get_drvdata(dev);
 357         int ret, i;
 358
 359         /*
 360          * This may look strange, but is done so the generic PM_SLEEP code
 361          * can power down our domains and more importantly power them up again
 362          * after resume, without tripping over our usage of runtime PM to
 363          * control the upstream GPC domains. Things happen in the right order
 364          * in the system suspend/resume paths due to the device parent/child
 365          * hierarchy.
 366          */
 367         ret = pm_runtime_get_sync(bc->bus_power_dev);
 368         if (ret < 0) {
 369                 pm_runtime_put_noidle(bc->bus_power_dev);
 370                 return ret;
 371         }
 372
 373         for (i = 0; i < bc->onecell_data.num_domains; i++) {
 374                 struct imx8m_blk_ctrl_domain *domain = &bc->domains[i];
 375
 376                 ret = pm_runtime_get_sync(domain->power_dev);
 377                 if (ret < 0) {
 378                         pm_runtime_put_noidle(domain->power_dev);
 379                         goto out_fail;
 380                 }
 381         }
 382
 383         return 0;
 384
 385 out_fail:
 386         for (i--; i >= 0; i--)
 387                 pm_runtime_put(bc->domains[i].power_dev);
 388
 389         pm_runtime_put(bc->bus_power_dev);
 390
 391         return ret;
 392 }
 393
 394 static int imx8m_blk_ctrl_resume(struct device *dev)
 395 {
 396         struct imx8m_blk_ctrl *bc = dev_get_drvdata(dev);
 397         int i;
 398
 399         for (i = 0; i < bc->onecell_data.num_domains; i++)
 400                 pm_runtime_put(bc->domains[i].power_dev);
 401
 402         pm_runtime_put(bc->bus_power_dev);
 403
 404         return 0;
 405 }
 406 #endif
 407
 408 static const struct dev_pm_ops imx8m_blk_ctrl_pm_ops = {
 409         SET_SYSTEM_SLEEP_PM_OPS(imx8m_blk_ctrl_suspend, imx8m_blk_ctrl_resume)
 410 };
 411
 412 static int imx8mm_vpu_power_notifier(struct notifier_block *nb,
 413                                      unsigned long action, void *data)
 414 {
 415         struct imx8m_blk_ctrl *bc = container_of(nb, struct imx8m_blk_ctrl,
 416                                                  power_nb);
 417
 418         if (action != GENPD_NOTIFY_ON && action != GENPD_NOTIFY_PRE_OFF)
 419                 return NOTIFY_OK;
 420
 421         /*
 422          * The ADB in the VPUMIX domain has no separate reset and clock
 423          * enable bits, but is ungated together with the VPU clocks. To
 424          * allow the handshake with the GPC to progress we put the VPUs
 425          * in reset and ungate the clocks.
 426          */
 427         regmap_clear_bits(bc->regmap, BLK_SFT_RSTN, BIT(0) | BIT(1) | BIT(2));
 428         regmap_set_bits(bc->regmap, BLK_CLK_EN, BIT(0) | BIT(1) | BIT(2));
 429
 430         if (action == GENPD_NOTIFY_ON) {
 431                 /*
 432                  * On power up we have no software backchannel to the GPC to
 433                  * wait for the ADB handshake to happen, so we just delay for a
 434                  * bit. On power down the GPC driver waits for the handshake.
 435                  */
 436                 udelay(5);
 437
 438                 /* set "fuse" bits to enable the VPUs */
 439                 regmap_set_bits(bc->regmap, 0x8, 0xffffffff);
 440                 regmap_set_bits(bc->regmap, 0xc, 0xffffffff);
 441                 regmap_set_bits(bc->regmap, 0x10, 0xffffffff);
 442                 regmap_set_bits(bc->regmap, 0x14, 0xffffffff);
 443         }
 444
 445         return NOTIFY_OK;
 446 }
 447
 448 static const struct imx8m_blk_ctrl_domain_data imx8mm_vpu_blk_ctl_domain_data[] = {
 449         [IMX8MM_VPUBLK_PD_G1] = {
 450                 .name = "vpublk-g1",
 451                 .clk_names = (const char *[]){ "g1", },
 452                 .num_clks = 1,
 453                 .gpc_name = "g1",
 454                 .rst_mask = BIT(1),
 455                 .clk_mask = BIT(1),
 456         },
 457         [IMX8MM_VPUBLK_PD_G2] = {
 458                 .name = "vpublk-g2",
 459                 .clk_names = (const char *[]){ "g2", },
 460                 .num_clks = 1,
 461                 .gpc_name = "g2",
 462                 .rst_mask = BIT(0),
 463                 .clk_mask = BIT(0),
 464         },
 465         [IMX8MM_VPUBLK_PD_H1] = {
 466                 .name = "vpublk-h1",
 467                 .clk_names = (const char *[]){ "h1", },
 468                 .num_clks = 1,
 469                 .gpc_name = "h1",
 470                 .rst_mask = BIT(2),
 471                 .clk_mask = BIT(2),
 472         },
 473 };
 474
 475 static const struct imx8m_blk_ctrl_data imx8mm_vpu_blk_ctl_dev_data = {
 476         .max_reg = 0x18,
 477         .power_notifier_fn = imx8mm_vpu_power_notifier,
 478         .domains = imx8mm_vpu_blk_ctl_domain_data,
 479         .num_domains = ARRAY_SIZE(imx8mm_vpu_blk_ctl_domain_data),
 480 };
 481
 482 static const struct imx8m_blk_ctrl_domain_data imx8mp_vpu_blk_ctl_domain_data[] = {
 483         [IMX8MP_VPUBLK_PD_G1] = {
 484                 .name = "vpublk-g1",
 485                 .clk_names = (const char *[]){ "g1", },
 486                 .num_clks = 1,
 487                 .gpc_name = "g1",
 488                 .rst_mask = BIT(1),
 489                 .clk_mask = BIT(1),
 490                 .path_names = (const char *[]){"g1"},
 491                 .num_paths = 1,
 492         },
 493         [IMX8MP_VPUBLK_PD_G2] = {
 494                 .name = "vpublk-g2",
 495                 .clk_names = (const char *[]){ "g2", },
 496                 .num_clks = 1,
 497                 .gpc_name = "g2",
 498                 .rst_mask = BIT(0),
 499                 .clk_mask = BIT(0),
 500                 .path_names = (const char *[]){"g2"},
 501                 .num_paths = 1,
 502         },
 503         [IMX8MP_VPUBLK_PD_VC8000E] = {
 504                 .name = "vpublk-vc8000e",
 505                 .clk_names = (const char *[]){ "vc8000e", },
 506                 .num_clks = 1,
 507                 .gpc_name = "vc8000e",
 508                 .rst_mask = BIT(2),
 509                 .clk_mask = BIT(2),
 510                 .path_names = (const char *[]){"vc8000e"},
 511                 .num_paths = 1,
 512         },
 513 };
 514
 515 static const struct imx8m_blk_ctrl_data imx8mp_vpu_blk_ctl_dev_data = {
 516         .max_reg = 0x18,
 517         .power_notifier_fn = imx8mm_vpu_power_notifier,
 518         .domains = imx8mp_vpu_blk_ctl_domain_data,
 519         .num_domains = ARRAY_SIZE(imx8mp_vpu_blk_ctl_domain_data),
 520 };
 521
 522 static int imx8mm_disp_power_notifier(struct notifier_block *nb,
 523                                       unsigned long action, void *data)
 524 {
 525         struct imx8m_blk_ctrl *bc = container_of(nb, struct imx8m_blk_ctrl,
 526                                                  power_nb);
 527
 528         if (action != GENPD_NOTIFY_ON && action != GENPD_NOTIFY_PRE_OFF)
 529                 return NOTIFY_OK;
 530
 531         /* Enable bus clock and deassert bus reset */
 532         regmap_set_bits(bc->regmap, BLK_CLK_EN, BIT(12));
 533         regmap_set_bits(bc->regmap, BLK_SFT_RSTN, BIT(6));
 534
 535         /*
 536          * On power up we have no software backchannel to the GPC to
 537          * wait for the ADB handshake to happen, so we just delay for a
 538          * bit. On power down the GPC driver waits for the handshake.
 539          */
 540         if (action == GENPD_NOTIFY_ON)
 541                 udelay(5);
 542
 543
 544         return NOTIFY_OK;
 545 }
 546
 547 static const struct imx8m_blk_ctrl_domain_data imx8mm_disp_blk_ctl_domain_data[] = {
 548         [IMX8MM_DISPBLK_PD_CSI_BRIDGE] = {
 549                 .name = "dispblk-csi-bridge",
 550                 .clk_names = (const char *[]){ "csi-bridge-axi", "csi-bridge-apb",
 551                                                "csi-bridge-core", },
 552                 .num_clks = 3,
 553                 .gpc_name = "csi-bridge",
 554                 .rst_mask = BIT(0) | BIT(1) | BIT(2),
 555                 .clk_mask = BIT(0) | BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(5),
 556         },
 557         [IMX8MM_DISPBLK_PD_LCDIF] = {
 558                 .name = "dispblk-lcdif",
 559                 .clk_names = (const char *[]){ "lcdif-axi", "lcdif-apb", "lcdif-pix", },
 560                 .num_clks = 3,
 561                 .gpc_name = "lcdif",
 562                 .clk_mask = BIT(6) | BIT(7),
 563         },
 564         [IMX8MM_DISPBLK_PD_MIPI_DSI] = {
 565                 .name = "dispblk-mipi-dsi",
 566                 .clk_names = (const char *[]){ "dsi-pclk", "dsi-ref", },
 567                 .num_clks = 2,
 568                 .gpc_name = "mipi-dsi",
 569                 .rst_mask = BIT(5),
 570                 .clk_mask = BIT(8) | BIT(9),
 571                 .mipi_phy_rst_mask = BIT(17),
 572         },
 573         [IMX8MM_DISPBLK_PD_MIPI_CSI] = {
 574                 .name = "dispblk-mipi-csi",
 575                 .clk_names = (const char *[]){ "csi-aclk", "csi-pclk" },
 576                 .num_clks = 2,
 577                 .gpc_name = "mipi-csi",
 578                 .rst_mask = BIT(3) | BIT(4),
 579                 .clk_mask = BIT(10) | BIT(11),
 580                 .mipi_phy_rst_mask = BIT(16),
 581         },
 582 };
 583
 584 static const struct imx8m_blk_ctrl_data imx8mm_disp_blk_ctl_dev_data = {
 585         .max_reg = 0x2c,
 586         .power_notifier_fn = imx8mm_disp_power_notifier,
 587         .domains = imx8mm_disp_blk_ctl_domain_data,
 588         .num_domains = ARRAY_SIZE(imx8mm_disp_blk_ctl_domain_data),
 589 };
 590
 591
 592 static int imx8mn_disp_power_notifier(struct notifier_block *nb,
 593                                       unsigned long action, void *data)
 594 {
 595         struct imx8m_blk_ctrl *bc = container_of(nb, struct imx8m_blk_ctrl,
 596                                                  power_nb);
 597
 598         if (action != GENPD_NOTIFY_ON && action != GENPD_NOTIFY_PRE_OFF)
 599                 return NOTIFY_OK;
 600
 601         /* Enable bus clock and deassert bus reset */
 602         regmap_set_bits(bc->regmap, BLK_CLK_EN, BIT(8));
 603         regmap_set_bits(bc->regmap, BLK_SFT_RSTN, BIT(8));
 604
 605         /*
 606          * On power up we have no software backchannel to the GPC to
 607          * wait for the ADB handshake to happen, so we just delay for a
 608          * bit. On power down the GPC driver waits for the handshake.
 609          */
 610         if (action == GENPD_NOTIFY_ON)
 611                 udelay(5);
 612
 613
 614         return NOTIFY_OK;
 615 }
 616
 617 static const struct imx8m_blk_ctrl_domain_data imx8mn_disp_blk_ctl_domain_data[] = {
 618         [IMX8MN_DISPBLK_PD_MIPI_DSI] = {
 619                 .name = "dispblk-mipi-dsi",
 620                 .clk_names = (const char *[]){ "dsi-pclk", "dsi-ref", },
 621                 .num_clks = 2,
 622                 .gpc_name = "mipi-dsi",
 623                 .rst_mask = BIT(0) | BIT(1),
 624                 .clk_mask = BIT(0) | BIT(1),
 625                 .mipi_phy_rst_mask = BIT(17),
 626         },
 627         [IMX8MN_DISPBLK_PD_MIPI_CSI] = {
 628                 .name = "dispblk-mipi-csi",
 629                 .clk_names = (const char *[]){ "csi-aclk", "csi-pclk" },
 630                 .num_clks = 2,
 631                 .gpc_name = "mipi-csi",
 632                 .rst_mask = BIT(2) | BIT(3),
 633                 .clk_mask = BIT(2) | BIT(3),
 634                 .mipi_phy_rst_mask = BIT(16),
 635         },
 636         [IMX8MN_DISPBLK_PD_LCDIF] = {
 637                 .name = "dispblk-lcdif",
 638                 .clk_names = (const char *[]){ "lcdif-axi", "lcdif-apb", "lcdif-pix", },
 639                 .num_clks = 3,
 640                 .gpc_name = "lcdif",
 641                 .rst_mask = BIT(4) | BIT(5),
 642                 .clk_mask = BIT(4) | BIT(5),
 643         },
 644         [IMX8MN_DISPBLK_PD_ISI] = {
 645                 .name = "dispblk-isi",
 646                 .clk_names = (const char *[]){ "disp_axi", "disp_apb", "disp_axi_root",
 647                                                 "disp_apb_root"},
 648                 .num_clks = 4,
 649                 .gpc_name = "isi",
 650                 .rst_mask = BIT(6) | BIT(7),
 651                 .clk_mask = BIT(6) | BIT(7),
 652         },
 653 };
 654
 655 static const struct imx8m_blk_ctrl_data imx8mn_disp_blk_ctl_dev_data = {
 656         .max_reg = 0x84,
 657         .power_notifier_fn = imx8mn_disp_power_notifier,
 658         .domains = imx8mn_disp_blk_ctl_domain_data,
 659         .num_domains = ARRAY_SIZE(imx8mn_disp_blk_ctl_domain_data),
 660 };
 661
 662 #define LCDIF_ARCACHE_CTRL      0x4c
 663 #define  LCDIF_1_RD_HURRY       GENMASK(15, 13)
 664 #define  LCDIF_0_RD_HURRY       GENMASK(12, 10)
 665
 666 static int imx8mp_media_power_notifier(struct notifier_block *nb,
 667                                 unsigned long action, void *data)
 668 {
 669         struct imx8m_blk_ctrl *bc = container_of(nb, struct imx8m_blk_ctrl,
 670                                                  power_nb);
 671
 672         if (action != GENPD_NOTIFY_ON && action != GENPD_NOTIFY_PRE_OFF)
 673                 return NOTIFY_OK;
 674
 675         /* Enable bus clock and deassert bus reset */
 676         regmap_set_bits(bc->regmap, BLK_CLK_EN, BIT(8));
 677         regmap_set_bits(bc->regmap, BLK_SFT_RSTN, BIT(8));
 678
 679         if (action == GENPD_NOTIFY_ON) {
 680                 /*
 681                  * On power up we have no software backchannel to the GPC to
 682                  * wait for the ADB handshake to happen, so we just delay for a
 683                  * bit. On power down the GPC driver waits for the handshake.
 684                  */
 685                 udelay(5);
 686
 687                 /*
 688                  * Set panic read hurry level for both LCDIF interfaces to
 689                  * maximum priority to minimize chances of display FIFO
 690                  * underflow.
 691                  */
 692                 regmap_set_bits(bc->regmap, LCDIF_ARCACHE_CTRL,
 693                                 FIELD_PREP(LCDIF_1_RD_HURRY, 7) |
 694                                 FIELD_PREP(LCDIF_0_RD_HURRY, 7));
 695         }
 696
 697         return NOTIFY_OK;
 698 }
 699
 700 /*
 701  * From i.MX 8M Plus Applications Processor Reference Manual, Rev. 1,
 702  * section 13.2.2, 13.2.3
 703  * isp-ahb and dwe are not in Figure 13-5. Media BLK_CTRL Clocks
 704  */
 705 static const struct imx8m_blk_ctrl_domain_data imx8mp_media_blk_ctl_domain_data[] = {
 706         [IMX8MP_MEDIABLK_PD_MIPI_DSI_1] = {
 707                 .name = "mediablk-mipi-dsi-1",
 708                 .clk_names = (const char *[]){ "apb", "phy", },
 709                 .num_clks = 2,
 710                 .gpc_name = "mipi-dsi1",
 711                 .rst_mask = BIT(0) | BIT(1),
 712                 .clk_mask = BIT(0) | BIT(1),
 713                 .mipi_phy_rst_mask = BIT(17),
 714         },
 715         [IMX8MP_MEDIABLK_PD_MIPI_CSI2_1] = {
 716                 .name = "mediablk-mipi-csi2-1",
 717                 .clk_names = (const char *[]){ "apb", "cam1" },
 718                 .num_clks = 2,
 719                 .gpc_name = "mipi-csi1",
 720                 .rst_mask = BIT(2) | BIT(3),
 721                 .clk_mask = BIT(2) | BIT(3),
 722                 .mipi_phy_rst_mask = BIT(16),
 723         },
 724         [IMX8MP_MEDIABLK_PD_LCDIF_1] = {
 725                 .name = "mediablk-lcdif-1",
 726                 .clk_names = (const char *[]){ "disp1", "apb", "axi", },
 727                 .num_clks = 3,
 728                 .gpc_name = "lcdif1",
 729                 .rst_mask = BIT(4) | BIT(5) | BIT(23),
 730                 .clk_mask = BIT(4) | BIT(5) | BIT(23),
 731                 .path_names = (const char *[]){"lcdif-rd", "lcdif-wr"},
 732                 .num_paths = 2,
 733         },
 734         [IMX8MP_MEDIABLK_PD_ISI] = {
 735                 .name = "mediablk-isi",
 736                 .clk_names = (const char *[]){ "axi", "apb" },
 737                 .num_clks = 2,
 738                 .gpc_name = "isi",
 739                 .rst_mask = BIT(6) | BIT(7),
 740                 .clk_mask = BIT(6) | BIT(7),
 741                 .path_names = (const char *[]){"isi0", "isi1", "isi2"},
 742                 .num_paths = 3,
 743         },
 744         [IMX8MP_MEDIABLK_PD_MIPI_CSI2_2] = {
 745                 .name = "mediablk-mipi-csi2-2",
 746                 .clk_names = (const char *[]){ "apb", "cam2" },
 747                 .num_clks = 2,
 748                 .gpc_name = "mipi-csi2",
 749                 .rst_mask = BIT(9) | BIT(10),
 750                 .clk_mask = BIT(9) | BIT(10),
 751                 .mipi_phy_rst_mask = BIT(30),
 752         },
 753         [IMX8MP_MEDIABLK_PD_LCDIF_2] = {
 754                 .name = "mediablk-lcdif-2",
 755                 .clk_names = (const char *[]){ "disp2", "apb", "axi", },
 756                 .num_clks = 3,
 757                 .gpc_name = "lcdif2",
 758                 .rst_mask = BIT(11) | BIT(12) | BIT(24),
 759                 .clk_mask = BIT(11) | BIT(12) | BIT(24),
 760                 .path_names = (const char *[]){"lcdif-rd", "lcdif-wr"},
 761                 .num_paths = 2,
 762         },
 763         [IMX8MP_MEDIABLK_PD_ISP] = {
 764                 .name = "mediablk-isp",
 765                 .clk_names = (const char *[]){ "isp", "axi", "apb" },
 766                 .num_clks = 3,
 767                 .gpc_name = "isp",
 768                 .rst_mask = BIT(16) | BIT(17) | BIT(18),
 769                 .clk_mask = BIT(16) | BIT(17) | BIT(18),
 770                 .path_names = (const char *[]){"isp0", "isp1"},
 771                 .num_paths = 2,
 772         },
 773         [IMX8MP_MEDIABLK_PD_DWE] = {
 774                 .name = "mediablk-dwe",
 775                 .clk_names = (const char *[]){ "axi", "apb" },
 776                 .num_clks = 2,
 777                 .gpc_name = "dwe",
 778                 .rst_mask = BIT(19) | BIT(20) | BIT(21),
 779                 .clk_mask = BIT(19) | BIT(20) | BIT(21),
 780                 .path_names = (const char *[]){"dwe"},
 781                 .num_paths = 1,
 782         },
 783         [IMX8MP_MEDIABLK_PD_MIPI_DSI_2] = {
 784                 .name = "mediablk-mipi-dsi-2",
 785                 .clk_names = (const char *[]){ "phy", },
 786                 .num_clks = 1,
 787                 .gpc_name = "mipi-dsi2",
 788                 .rst_mask = BIT(22),
 789                 .clk_mask = BIT(22),
 790                 .mipi_phy_rst_mask = BIT(29),
 791         },
 792 };
 793
 794 static const struct imx8m_blk_ctrl_data imx8mp_media_blk_ctl_dev_data = {
 795         .max_reg = 0x138,
 796         .power_notifier_fn = imx8mp_media_power_notifier,
 797         .domains = imx8mp_media_blk_ctl_domain_data,
 798         .num_domains = ARRAY_SIZE(imx8mp_media_blk_ctl_domain_data),
 799 };
 800
 801 static int imx8mq_vpu_power_notifier(struct notifier_block *nb,
 802                                      unsigned long action, void *data)
 803 {
 804         struct imx8m_blk_ctrl *bc = container_of(nb, struct imx8m_blk_ctrl,
 805                                                  power_nb);
 806
 807         if (action != GENPD_NOTIFY_ON && action != GENPD_NOTIFY_PRE_OFF)
 808                 return NOTIFY_OK;
 809
 810         /*
 811          * The ADB in the VPUMIX domain has no separate reset and clock
 812          * enable bits, but is ungated and reset together with the VPUs. The
 813          * reset and clock enable inputs to the ADB is a logical OR of the
 814          * VPU bits. In order to set the G2 fuse bits, the G2 clock must
 815          * also be enabled.
 816          */
 817         regmap_set_bits(bc->regmap, BLK_SFT_RSTN, BIT(0) | BIT(1));
 818         regmap_set_bits(bc->regmap, BLK_CLK_EN, BIT(0) | BIT(1));
 819
 820         if (action == GENPD_NOTIFY_ON) {
 821                 /*
 822                  * On power up we have no software backchannel to the GPC to
 823                  * wait for the ADB handshake to happen, so we just delay for a
 824                  * bit. On power down the GPC driver waits for the handshake.
 825                  */
 826                 udelay(5);
 827
 828                 /* set "fuse" bits to enable the VPUs */
 829                 regmap_set_bits(bc->regmap, 0x8, 0xffffffff);
 830                 regmap_set_bits(bc->regmap, 0xc, 0xffffffff);
 831                 regmap_set_bits(bc->regmap, 0x10, 0xffffffff);
 832         }
 833
 834         return NOTIFY_OK;
 835 }
 836
 837 static const struct imx8m_blk_ctrl_domain_data imx8mq_vpu_blk_ctl_domain_data[] = {
 838         [IMX8MQ_VPUBLK_PD_G1] = {
 839                 .name = "vpublk-g1",
 840                 .clk_names = (const char *[]){ "g1", },
 841                 .num_clks = 1,
 842                 .gpc_name = "g1",
 843                 .rst_mask = BIT(1),
 844                 .clk_mask = BIT(1),
 845         },
 846         [IMX8MQ_VPUBLK_PD_G2] = {
 847                 .name = "vpublk-g2",
 848                 .clk_names = (const char *[]){ "g2", },
 849                 .num_clks = 1,
 850                 .gpc_name = "g2",
 851                 .rst_mask = BIT(0),
 852                 .clk_mask = BIT(0),
 853         },
 854 };
 855
 856 static const struct imx8m_blk_ctrl_data imx8mq_vpu_blk_ctl_dev_data = {
 857         .max_reg = 0x14,
 858         .power_notifier_fn = imx8mq_vpu_power_notifier,
 859         .domains = imx8mq_vpu_blk_ctl_domain_data,
 860         .num_domains = ARRAY_SIZE(imx8mq_vpu_blk_ctl_domain_data),
 861 };
 862
 863 static const struct of_device_id imx8m_blk_ctrl_of_match[] = {
 864         {
 865                 .compatible = "fsl,imx8mm-vpu-blk-ctrl",
 866                 .data = &imx8mm_vpu_blk_ctl_dev_data
 867         }, {
 868                 .compatible = "fsl,imx8mm-disp-blk-ctrl",
 869                 .data = &imx8mm_disp_blk_ctl_dev_data
 870         }, {
 871                 .compatible = "fsl,imx8mn-disp-blk-ctrl",
 872                 .data = &imx8mn_disp_blk_ctl_dev_data
 873         }, {
 874                 .compatible = "fsl,imx8mp-media-blk-ctrl",
 875                 .data = &imx8mp_media_blk_ctl_dev_data
 876         }, {
 877                 .compatible = "fsl,imx8mq-vpu-blk-ctrl",
 878                 .data = &imx8mq_vpu_blk_ctl_dev_data
 879         }, {
 880                 .compatible = "fsl,imx8mp-vpu-blk-ctrl",
 881                 .data = &imx8mp_vpu_blk_ctl_dev_data
 882         }, {
 883                 /* Sentinel */
 884         }
 885 };
 886 MODULE_DEVICE_TABLE(of, imx8m_blk_ctrl_of_match);
 887
 888 static struct platform_driver imx8m_blk_ctrl_driver = {
 889         .probe = imx8m_blk_ctrl_probe,
 890         .remove = imx8m_blk_ctrl_remove,
 891         .driver = {
 892                 .name = "imx8m-blk-ctrl",
 893                 .pm = &imx8m_blk_ctrl_pm_ops,
 894                 .of_match_table = imx8m_blk_ctrl_of_match,
 895         },
 896 };
 897 module_platform_driver(imx8m_blk_ctrl_driver);
 898 MODULE_LICENSE("GPL");