drivers/soc/imx/gpc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2015-2017 Pengutronix, Lucas Stach <kernel@pengutronix.de>
   4  * Copyright 2011-2013 Freescale Semiconductor, Inc.
   5  */
   6
   7 #include <linux/clk.h>
   8 #include <linux/delay.h>
   9 #include <linux/io.h>
  10 #include <linux/of_device.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/pm_domain.h>
  13 #include <linux/regmap.h>
  14 #include <linux/regulator/consumer.h>
  15
  16 #define GPC_CNTR                0x000
  17
  18 #define GPC_PGC_CTRL_OFFS       0x0
  19 #define GPC_PGC_PUPSCR_OFFS     0x4
  20 #define GPC_PGC_PDNSCR_OFFS     0x8
  21 #define GPC_PGC_SW2ISO_SHIFT    0x8
  22 #define GPC_PGC_SW_SHIFT        0x0
  23
  24 #define GPC_PGC_PCI_PDN         0x200
  25 #define GPC_PGC_PCI_SR          0x20c
  26
  27 #define GPC_PGC_GPU_PDN         0x260
  28 #define GPC_PGC_GPU_PUPSCR      0x264
  29 #define GPC_PGC_GPU_PDNSCR      0x268
  30 #define GPC_PGC_GPU_SR          0x26c
  31
  32 #define GPC_PGC_DISP_PDN        0x240
  33 #define GPC_PGC_DISP_SR         0x24c
  34
  35 #define GPU_VPU_PUP_REQ         BIT(1)
  36 #define GPU_VPU_PDN_REQ         BIT(0)
  37
  38 #define GPC_CLK_MAX             7
  39
  40 #define PGC_DOMAIN_FLAG_NO_PD           BIT(0)
  41
  42 struct imx_pm_domain {
  43         struct generic_pm_domain base;
  44         struct regmap *regmap;
  45         struct regulator *supply;
  46         struct clk *clk[GPC_CLK_MAX];
  47         int num_clks;
  48         unsigned int reg_offs;
  49         signed char cntr_pdn_bit;
  50         unsigned int ipg_rate_mhz;
  51 };
  52
  53 static inline struct imx_pm_domain *
  54 to_imx_pm_domain(struct generic_pm_domain *genpd)
  55 {
  56         return container_of(genpd, struct imx_pm_domain, base);
  57 }
  58
  59 static int imx6_pm_domain_power_off(struct generic_pm_domain *genpd)
  60 {
  61         struct imx_pm_domain *pd = to_imx_pm_domain(genpd);
  62         int iso, iso2sw;
  63         u32 val;
  64
  65         /* Read ISO and ISO2SW power down delays */
  66         regmap_read(pd->regmap, pd->reg_offs + GPC_PGC_PDNSCR_OFFS, &val);
  67         iso = val & 0x3f;
  68         iso2sw = (val >> 8) & 0x3f;
  69
  70         /* Gate off domain when powered down */
  71         regmap_update_bits(pd->regmap, pd->reg_offs + GPC_PGC_CTRL_OFFS,
  72                            0x1, 0x1);
  73
  74         /* Request GPC to power down domain */
  75         val = BIT(pd->cntr_pdn_bit);
  76         regmap_update_bits(pd->regmap, GPC_CNTR, val, val);
  77
  78         /* Wait ISO + ISO2SW IPG clock cycles */
  79         udelay(DIV_ROUND_UP(iso + iso2sw, pd->ipg_rate_mhz));
  80
  81         if (pd->supply)
  82                 regulator_disable(pd->supply);
  83
  84         return 0;
  85 }
  86
  87 static int imx6_pm_domain_power_on(struct generic_pm_domain *genpd)
  88 {
  89         struct imx_pm_domain *pd = to_imx_pm_domain(genpd);
  90         int i, ret;
  91         u32 val, req;
  92
  93         if (pd->supply) {
  94                 ret = regulator_enable(pd->supply);
  95                 if (ret) {
  96                         pr_err("%s: failed to enable regulator: %d\n",
  97                                __func__, ret);
  98                         return ret;
  99                 }
 100         }
 101
 102         /* Enable reset clocks for all devices in the domain */
 103         for (i = 0; i < pd->num_clks; i++)
 104                 clk_prepare_enable(pd->clk[i]);
 105
 106         /* Gate off domain when powered down */
 107         regmap_update_bits(pd->regmap, pd->reg_offs + GPC_PGC_CTRL_OFFS,
 108                            0x1, 0x1);
 109
 110         /* Request GPC to power up domain */
 111         req = BIT(pd->cntr_pdn_bit + 1);
 112         regmap_update_bits(pd->regmap, GPC_CNTR, req, req);
 113
 114         /* Wait for the PGC to handle the request */
 115         ret = regmap_read_poll_timeout(pd->regmap, GPC_CNTR, val, !(val & req),
 116                                        1, 50);
 117         if (ret)
 118                 pr_err("powerup request on domain %s timed out\n", genpd->name);
 119
 120         /* Wait for reset to propagate through peripherals */
 121         usleep_range(5, 10);
 122
 123         /* Disable reset clocks for all devices in the domain */
 124         for (i = 0; i < pd->num_clks; i++)
 125                 clk_disable_unprepare(pd->clk[i]);
 126
 127         return 0;
 128 }
 129
 130 static int imx_pgc_get_clocks(struct device *dev, struct imx_pm_domain *domain)
 131 {
 132         int i, ret;
 133
 134         for (i = 0; ; i++) {
 135                 struct clk *clk = of_clk_get(dev->of_node, i);
 136                 if (IS_ERR(clk))
 137                         break;
 138                 if (i >= GPC_CLK_MAX) {
 139                         dev_err(dev, "more than %d clocks\n", GPC_CLK_MAX);
 140                         ret = -EINVAL;
 141                         goto clk_err;
 142                 }
 143                 domain->clk[i] = clk;
 144         }
 145         domain->num_clks = i;
 146
 147         return 0;
 148
 149 clk_err:
 150         while (i--)
 151                 clk_put(domain->clk[i]);
 152
 153         return ret;
 154 }
 155
 156 static void imx_pgc_put_clocks(struct imx_pm_domain *domain)
 157 {
 158         int i;
 159
 160         for (i = domain->num_clks - 1; i >= 0; i--)
 161                 clk_put(domain->clk[i]);
 162 }
 163
 164 static int imx_pgc_parse_dt(struct device *dev, struct imx_pm_domain *domain)
 165 {
 166         /* try to get the domain supply regulator */
 167         domain->supply = devm_regulator_get_optional(dev, "power");
 168         if (IS_ERR(domain->supply)) {
 169                 if (PTR_ERR(domain->supply) == -ENODEV)
 170                         domain->supply = NULL;
 171                 else
 172                         return PTR_ERR(domain->supply);
 173         }
 174
 175         /* try to get all clocks needed for reset propagation */
 176         return imx_pgc_get_clocks(dev, domain);
 177 }
 178
 179 static int imx_pgc_power_domain_probe(struct platform_device *pdev)
 180 {
 181         struct imx_pm_domain *domain = pdev->dev.platform_data;
 182         struct device *dev = &pdev->dev;
 183         int ret;
 184
 185         /* if this PD is associated with a DT node try to parse it */
 186         if (dev->of_node) {
 187                 ret = imx_pgc_parse_dt(dev, domain);
 188                 if (ret)
 189                         return ret;
 190         }
 191
 192         /* initially power on the domain */
 193         if (domain->base.power_on)
 194                 domain->base.power_on(&domain->base);
 195
 196         if (IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS)) {
 197                 pm_genpd_init(&domain->base, NULL, false);
 198                 ret = of_genpd_add_provider_simple(dev->of_node, &domain->base);
 199                 if (ret)
 200                         goto genpd_err;
 201         }
 202
 203         device_link_add(dev, dev->parent, DL_FLAG_AUTOREMOVE_CONSUMER);
 204
 205         return 0;
 206
 207 genpd_err:
 208         pm_genpd_remove(&domain->base);
 209         imx_pgc_put_clocks(domain);
 210
 211         return ret;
 212 }
 213
 214 static int imx_pgc_power_domain_remove(struct platform_device *pdev)
 215 {
 216         struct imx_pm_domain *domain = pdev->dev.platform_data;
 217
 218         if (IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS)) {
 219                 of_genpd_del_provider(pdev->dev.of_node);
 220                 pm_genpd_remove(&domain->base);
 221                 imx_pgc_put_clocks(domain);
 222         }
 223
 224         return 0;
 225 }
 226
 227 static const struct platform_device_id imx_pgc_power_domain_id[] = {
 228         { "imx-pgc-power-domain"},
 229         { },
 230 };
 231
 232 static struct platform_driver imx_pgc_power_domain_driver = {
 233         .driver = {
 234                 .name = "imx-pgc-pd",
 235         },
 236         .probe = imx_pgc_power_domain_probe,
 237         .remove = imx_pgc_power_domain_remove,
 238         .id_table = imx_pgc_power_domain_id,
 239 };
 240 builtin_platform_driver(imx_pgc_power_domain_driver)
 241
 242 #define GPC_PGC_DOMAIN_ARM      0
 243 #define GPC_PGC_DOMAIN_PU       1
 244 #define GPC_PGC_DOMAIN_DISPLAY  2
 245 #define GPC_PGC_DOMAIN_PCI      3
 246
 247 static struct genpd_power_state imx6_pm_domain_pu_state = {
 248         .power_off_latency_ns = 25000,
 249         .power_on_latency_ns = 2000000,
 250 };
 251
 252 static struct imx_pm_domain imx_gpc_domains[] = {
 253         [GPC_PGC_DOMAIN_ARM] = {
 254                 .base = {
 255                         .name = "ARM",
 256                         .flags = GENPD_FLAG_ALWAYS_ON,
 257                 },
 258         },
 259         [GPC_PGC_DOMAIN_PU] = {
 260                 .base = {
 261                         .name = "PU",
 262                         .power_off = imx6_pm_domain_power_off,
 263                         .power_on = imx6_pm_domain_power_on,
 264                         .states = &imx6_pm_domain_pu_state,
 265                         .state_count = 1,
 266                 },
 267                 .reg_offs = 0x260,
 268                 .cntr_pdn_bit = 0,
 269         },
 270         [GPC_PGC_DOMAIN_DISPLAY] = {
 271                 .base = {
 272                         .name = "DISPLAY",
 273                         .power_off = imx6_pm_domain_power_off,
 274                         .power_on = imx6_pm_domain_power_on,
 275                 },
 276                 .reg_offs = 0x240,
 277                 .cntr_pdn_bit = 4,
 278         },
 279         [GPC_PGC_DOMAIN_PCI] = {
 280                 .base = {
 281                         .name = "PCI",
 282                         .power_off = imx6_pm_domain_power_off,
 283                         .power_on = imx6_pm_domain_power_on,
 284                 },
 285                 .reg_offs = 0x200,
 286                 .cntr_pdn_bit = 6,
 287         },
 288 };
 289
 290 struct imx_gpc_dt_data {
 291         int num_domains;
 292         bool err009619_present;
 293         bool err006287_present;
 294 };
 295
 296 static const struct imx_gpc_dt_data imx6q_dt_data = {
 297         .num_domains = 2,
 298         .err009619_present = false,
 299         .err006287_present = false,
 300 };
 301
 302 static const struct imx_gpc_dt_data imx6qp_dt_data = {
 303         .num_domains = 2,
 304         .err009619_present = true,
 305         .err006287_present = false,
 306 };
 307
 308 static const struct imx_gpc_dt_data imx6sl_dt_data = {
 309         .num_domains = 3,
 310         .err009619_present = false,
 311         .err006287_present = true,
 312 };
 313
 314 static const struct imx_gpc_dt_data imx6sx_dt_data = {
 315         .num_domains = 4,
 316         .err009619_present = false,
 317         .err006287_present = false,
 318 };
 319
 320 static const struct of_device_id imx_gpc_dt_ids[] = {
 321         { .compatible = "fsl,imx6q-gpc", .data = &imx6q_dt_data },
 322         { .compatible = "fsl,imx6qp-gpc", .data = &imx6qp_dt_data },
 323         { .compatible = "fsl,imx6sl-gpc", .data = &imx6sl_dt_data },
 324         { .compatible = "fsl,imx6sx-gpc", .data = &imx6sx_dt_data },
 325         { }
 326 };
 327
 328 static const struct regmap_range yes_ranges[] = {
 329         regmap_reg_range(GPC_CNTR, GPC_CNTR),
 330         regmap_reg_range(GPC_PGC_PCI_PDN, GPC_PGC_PCI_SR),
 331         regmap_reg_range(GPC_PGC_GPU_PDN, GPC_PGC_GPU_SR),
 332         regmap_reg_range(GPC_PGC_DISP_PDN, GPC_PGC_DISP_SR),
 333 };
 334
 335 static const struct regmap_access_table access_table = {
 336         .yes_ranges     = yes_ranges,
 337         .n_yes_ranges   = ARRAY_SIZE(yes_ranges),
 338 };
 339
 340 static const struct regmap_config imx_gpc_regmap_config = {
 341         .reg_bits = 32,
 342         .val_bits = 32,
 343         .reg_stride = 4,
 344         .rd_table = &access_table,
 345         .wr_table = &access_table,
 346         .max_register = 0x2ac,
 347         .fast_io = true,
 348 };
 349
 350 static struct generic_pm_domain *imx_gpc_onecell_domains[] = {
 351         &imx_gpc_domains[GPC_PGC_DOMAIN_ARM].base,
 352         &imx_gpc_domains[GPC_PGC_DOMAIN_PU].base,
 353 };
 354
 355 static struct genpd_onecell_data imx_gpc_onecell_data = {
 356         .domains = imx_gpc_onecell_domains,
 357         .num_domains = 2,
 358 };
 359
 360 static int imx_gpc_old_dt_init(struct device *dev, struct regmap *regmap,
 361                                unsigned int num_domains)
 362 {
 363         struct imx_pm_domain *domain;
 364         int i, ret;
 365
 366         for (i = 0; i < num_domains; i++) {
 367                 domain = &imx_gpc_domains[i];
 368                 domain->regmap = regmap;
 369                 domain->ipg_rate_mhz = 66;
 370
 371                 if (i == 1) {
 372                         domain->supply = devm_regulator_get(dev, "pu");
 373                         if (IS_ERR(domain->supply))
 374                                 return PTR_ERR(domain->supply);
 375
 376                         ret = imx_pgc_get_clocks(dev, domain);
 377                         if (ret)
 378                                 goto clk_err;
 379
 380                         domain->base.power_on(&domain->base);
 381                 }
 382         }
 383
 384         for (i = 0; i < num_domains; i++)
 385                 pm_genpd_init(&imx_gpc_domains[i].base, NULL, false);
 386
 387         if (IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS)) {
 388                 ret = of_genpd_add_provider_onecell(dev->of_node,
 389                                                     &imx_gpc_onecell_data);
 390                 if (ret)
 391                         goto genpd_err;
 392         }
 393
 394         return 0;
 395
 396 genpd_err:
 397         for (i = 0; i < num_domains; i++)
 398                 pm_genpd_remove(&imx_gpc_domains[i].base);
 399         imx_pgc_put_clocks(&imx_gpc_domains[GPC_PGC_DOMAIN_PU]);
 400 clk_err:
 401         return ret;
 402 }
 403
 404 static int imx_gpc_probe(struct platform_device *pdev)
 405 {
 406         const struct of_device_id *of_id =
 407                         of_match_device(imx_gpc_dt_ids, &pdev->dev);
 408         const struct imx_gpc_dt_data *of_id_data = of_id->data;
 409         struct device_node *pgc_node;
 410         struct regmap *regmap;
 411         void __iomem *base;
 412         int ret;
 413
 414         pgc_node = of_get_child_by_name(pdev->dev.of_node, "pgc");
 415
 416         /* bail out if DT too old and doesn't provide the necessary info */
 417         if (!of_property_read_bool(pdev->dev.of_node, "#power-domain-cells") &&
 418             !pgc_node)
 419                 return 0;
 420
 421         base = devm_platform_ioremap_resource(pdev, 0);
 422         if (IS_ERR(base))
 423                 return PTR_ERR(base);
 424
 425         regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
 426                                            &imx_gpc_regmap_config);
 427         if (IS_ERR(regmap)) {
 428                 ret = PTR_ERR(regmap);
 429                 dev_err(&pdev->dev, "failed to init regmap: %d\n",
 430                         ret);
 431                 return ret;
 432         }
 433
 434         /*
 435          * Disable PU power down by runtime PM if ERR009619 is present.
 436          *
 437          * The PRE clock will be paused for several cycles when turning on the
 438          * PU domain LDO from power down state. If PRE is in use at that time,
 439          * the IPU/PRG cannot get the correct display data from the PRE.
 440          *
 441          * This is not a concern when the whole system enters suspend state, so
 442          * it's safe to power down PU in this case.
 443          */
 444         if (of_id_data->err009619_present)
 445                 imx_gpc_domains[GPC_PGC_DOMAIN_PU].base.flags |=
 446                                 GENPD_FLAG_RPM_ALWAYS_ON;
 447
 448         /* Keep DISP always on if ERR006287 is present */
 449         if (of_id_data->err006287_present)
 450                 imx_gpc_domains[GPC_PGC_DOMAIN_DISPLAY].base.flags |=
 451                                 GENPD_FLAG_ALWAYS_ON;
 452
 453         if (!pgc_node) {
 454                 ret = imx_gpc_old_dt_init(&pdev->dev, regmap,
 455                                           of_id_data->num_domains);
 456                 if (ret)
 457                         return ret;
 458         } else {
 459                 struct imx_pm_domain *domain;
 460                 struct platform_device *pd_pdev;
 461                 struct device_node *np;
 462                 struct clk *ipg_clk;
 463                 unsigned int ipg_rate_mhz;
 464                 int domain_index;
 465
 466                 ipg_clk = devm_clk_get(&pdev->dev, "ipg");
 467                 if (IS_ERR(ipg_clk))
 468                         return PTR_ERR(ipg_clk);
 469                 ipg_rate_mhz = clk_get_rate(ipg_clk) / 1000000;
 470
 471                 for_each_child_of_node(pgc_node, np) {
 472                         ret = of_property_read_u32(np, "reg", &domain_index);
 473                         if (ret) {
 474                                 of_node_put(np);
 475                                 return ret;
 476                         }
 477                         if (domain_index >= of_id_data->num_domains)
 478                                 continue;
 479
 480                         pd_pdev = platform_device_alloc("imx-pgc-power-domain",
 481                                                         domain_index);
 482                         if (!pd_pdev) {
 483                                 of_node_put(np);
 484                                 return -ENOMEM;
 485                         }
 486
 487                         ret = platform_device_add_data(pd_pdev,
 488                                                        &imx_gpc_domains[domain_index],
 489                                                        sizeof(imx_gpc_domains[domain_index]));
 490                         if (ret) {
 491                                 platform_device_put(pd_pdev);
 492                                 of_node_put(np);
 493                                 return ret;
 494                         }
 495                         domain = pd_pdev->dev.platform_data;
 496                         domain->regmap = regmap;
 497                         domain->ipg_rate_mhz = ipg_rate_mhz;
 498
 499                         pd_pdev->dev.parent = &pdev->dev;
 500                         pd_pdev->dev.of_node = np;
 501
 502                         ret = platform_device_add(pd_pdev);
 503                         if (ret) {
 504                                 platform_device_put(pd_pdev);
 505                                 of_node_put(np);
 506                                 return ret;
 507                         }
 508                 }
 509         }
 510
 511         return 0;
 512 }
 513
 514 static int imx_gpc_remove(struct platform_device *pdev)
 515 {
 516         struct device_node *pgc_node;
 517         int ret;
 518
 519         pgc_node = of_get_child_by_name(pdev->dev.of_node, "pgc");
 520
 521         /* bail out if DT too old and doesn't provide the necessary info */
 522         if (!of_property_read_bool(pdev->dev.of_node, "#power-domain-cells") &&
 523             !pgc_node)
 524                 return 0;
 525
 526         /*
 527          * If the old DT binding is used the toplevel driver needs to
 528          * de-register the power domains
 529          */
 530         if (!pgc_node) {
 531                 of_genpd_del_provider(pdev->dev.of_node);
 532
 533                 ret = pm_genpd_remove(&imx_gpc_domains[GPC_PGC_DOMAIN_PU].base);
 534                 if (ret)
 535                         return ret;
 536                 imx_pgc_put_clocks(&imx_gpc_domains[GPC_PGC_DOMAIN_PU]);
 537
 538                 ret = pm_genpd_remove(&imx_gpc_domains[GPC_PGC_DOMAIN_ARM].base);
 539                 if (ret)
 540                         return ret;
 541         }
 542
 543         return 0;
 544 }
 545
 546 static struct platform_driver imx_gpc_driver = {
 547         .driver = {
 548                 .name = "imx-gpc",
 549                 .of_match_table = imx_gpc_dt_ids,
 550         },
 551         .probe = imx_gpc_probe,
 552         .remove = imx_gpc_remove,
 553 };
 554 builtin_platform_driver(imx_gpc_driver)