drivers/soc/imx/gpc.c

   1 /*
   2  * Copyright 2015-2017 Pengutronix, Lucas Stach <kernel@pengutronix.de>
   3  * Copyright 2011-2013 Freescale Semiconductor, Inc.
   4  *
   5  * The code contained herein is licensed under the GNU General Public
   6  * License. You may obtain a copy of the GNU General Public License
   7  * Version 2 or later at the following locations:
   8  *
   9  * http://www.opensource.org/licenses/gpl-license.html
  10  * http://www.gnu.org/copyleft/gpl.html
  11  */
  12
  13 #include <linux/clk.h>
  14 #include <linux/delay.h>
  15 #include <linux/io.h>
  16 #include <linux/of_device.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/pm_domain.h>
  19 #include <linux/regmap.h>
  20 #include <linux/regulator/consumer.h>
  21
  22 #define GPC_CNTR                0x000
  23
  24 #define GPC_PGC_CTRL_OFFS       0x0
  25 #define GPC_PGC_PUPSCR_OFFS     0x4
  26 #define GPC_PGC_PDNSCR_OFFS     0x8
  27 #define GPC_PGC_SW2ISO_SHIFT    0x8
  28 #define GPC_PGC_SW_SHIFT        0x0
  29
  30 #define GPC_PGC_GPU_PDN         0x260
  31 #define GPC_PGC_GPU_PUPSCR      0x264
  32 #define GPC_PGC_GPU_PDNSCR      0x268
  33
  34 #define GPU_VPU_PUP_REQ         BIT(1)
  35 #define GPU_VPU_PDN_REQ         BIT(0)
  36
  37 #define GPC_CLK_MAX             6
  38
  39 #define PGC_DOMAIN_FLAG_NO_PD           BIT(0)
  40
  41 struct imx_pm_domain {
  42         struct generic_pm_domain base;
  43         struct regmap *regmap;
  44         struct regulator *supply;
  45         struct clk *clk[GPC_CLK_MAX];
  46         int num_clks;
  47         unsigned int reg_offs;
  48         signed char cntr_pdn_bit;
  49         unsigned int ipg_rate_mhz;
  50         unsigned int flags;
  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         if (pd->flags & PGC_DOMAIN_FLAG_NO_PD)
  66                 return -EBUSY;
  67
  68         /* Read ISO and ISO2SW power down delays */
  69         regmap_read(pd->regmap, pd->reg_offs + GPC_PGC_PUPSCR_OFFS, &val);
  70         iso = val & 0x3f;
  71         iso2sw = (val >> 8) & 0x3f;
  72
  73         /* Gate off domain when powered down */
  74         regmap_update_bits(pd->regmap, pd->reg_offs + GPC_PGC_CTRL_OFFS,
  75                            0x1, 0x1);
  76
  77         /* Request GPC to power down domain */
  78         val = BIT(pd->cntr_pdn_bit);
  79         regmap_update_bits(pd->regmap, GPC_CNTR, val, val);
  80
  81         /* Wait ISO + ISO2SW IPG clock cycles */
  82         udelay(DIV_ROUND_UP(iso + iso2sw, pd->ipg_rate_mhz));
  83
  84         if (pd->supply)
  85                 regulator_disable(pd->supply);
  86
  87         return 0;
  88 }
  89
  90 static int imx6_pm_domain_power_on(struct generic_pm_domain *genpd)
  91 {
  92         struct imx_pm_domain *pd = to_imx_pm_domain(genpd);
  93         int i, ret, sw, sw2iso;
  94         u32 val;
  95
  96         if (pd->supply) {
  97                 ret = regulator_enable(pd->supply);
  98                 if (ret) {
  99                         pr_err("%s: failed to enable regulator: %d\n",
 100                                __func__, ret);
 101                         return ret;
 102                 }
 103         }
 104
 105         /* Enable reset clocks for all devices in the domain */
 106         for (i = 0; i < pd->num_clks; i++)
 107                 clk_prepare_enable(pd->clk[i]);
 108
 109         /* Gate off domain when powered down */
 110         regmap_update_bits(pd->regmap, pd->reg_offs + GPC_PGC_CTRL_OFFS,
 111                            0x1, 0x1);
 112
 113         /* Read ISO and ISO2SW power up delays */
 114         regmap_read(pd->regmap, pd->reg_offs + GPC_PGC_PUPSCR_OFFS, &val);
 115         sw = val & 0x3f;
 116         sw2iso = (val >> 8) & 0x3f;
 117
 118         /* Request GPC to power up domain */
 119         val = BIT(pd->cntr_pdn_bit + 1);
 120         regmap_update_bits(pd->regmap, GPC_CNTR, val, val);
 121
 122         /* Wait ISO + ISO2SW IPG clock cycles */
 123         udelay(DIV_ROUND_UP(sw + sw2iso, pd->ipg_rate_mhz));
 124
 125         /* Disable reset clocks for all devices in the domain */
 126         for (i = 0; i < pd->num_clks; i++)
 127                 clk_disable_unprepare(pd->clk[i]);
 128
 129         return 0;
 130 }
 131
 132 static int imx_pgc_get_clocks(struct device *dev, struct imx_pm_domain *domain)
 133 {
 134         int i, ret;
 135
 136         for (i = 0; ; i++) {
 137                 struct clk *clk = of_clk_get(dev->of_node, i);
 138                 if (IS_ERR(clk))
 139                         break;
 140                 if (i >= GPC_CLK_MAX) {
 141                         dev_err(dev, "more than %d clocks\n", GPC_CLK_MAX);
 142                         ret = -EINVAL;
 143                         goto clk_err;
 144                 }
 145                 domain->clk[i] = clk;
 146         }
 147         domain->num_clks = i;
 148
 149         return 0;
 150
 151 clk_err:
 152         while (i--)
 153                 clk_put(domain->clk[i]);
 154
 155         return ret;
 156 }
 157
 158 static void imx_pgc_put_clocks(struct imx_pm_domain *domain)
 159 {
 160         int i;
 161
 162         for (i = domain->num_clks - 1; i >= 0; i--)
 163                 clk_put(domain->clk[i]);
 164 }
 165
 166 static int imx_pgc_parse_dt(struct device *dev, struct imx_pm_domain *domain)
 167 {
 168         /* try to get the domain supply regulator */
 169         domain->supply = devm_regulator_get_optional(dev, "power");
 170         if (IS_ERR(domain->supply)) {
 171                 if (PTR_ERR(domain->supply) == -ENODEV)
 172                         domain->supply = NULL;
 173                 else
 174                         return PTR_ERR(domain->supply);
 175         }
 176
 177         /* try to get all clocks needed for reset propagation */
 178         return imx_pgc_get_clocks(dev, domain);
 179 }
 180
 181 static int imx_pgc_power_domain_probe(struct platform_device *pdev)
 182 {
 183         struct imx_pm_domain *domain = pdev->dev.platform_data;
 184         struct device *dev = &pdev->dev;
 185         int ret;
 186
 187         /* if this PD is associated with a DT node try to parse it */
 188         if (dev->of_node) {
 189                 ret = imx_pgc_parse_dt(dev, domain);
 190                 if (ret)
 191                         return ret;
 192         }
 193
 194         /* initially power on the domain */
 195         if (domain->base.power_on)
 196                 domain->base.power_on(&domain->base);
 197
 198         if (IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS)) {
 199                 pm_genpd_init(&domain->base, NULL, false);
 200                 ret = of_genpd_add_provider_simple(dev->of_node, &domain->base);
 201                 if (ret)
 202                         goto genpd_err;
 203         }
 204
 205         device_link_add(dev, dev->parent, DL_FLAG_AUTOREMOVE);
 206
 207         return 0;
 208
 209 genpd_err:
 210         pm_genpd_remove(&domain->base);
 211         imx_pgc_put_clocks(domain);
 212
 213         return ret;
 214 }
 215
 216 static int imx_pgc_power_domain_remove(struct platform_device *pdev)
 217 {
 218         struct imx_pm_domain *domain = pdev->dev.platform_data;
 219
 220         if (IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS)) {
 221                 of_genpd_del_provider(pdev->dev.of_node);
 222                 pm_genpd_remove(&domain->base);
 223                 imx_pgc_put_clocks(domain);
 224         }
 225
 226         return 0;
 227 }
 228
 229 static const struct platform_device_id imx_pgc_power_domain_id[] = {
 230         { "imx-pgc-power-domain"},
 231         { },
 232 };
 233
 234 static struct platform_driver imx_pgc_power_domain_driver = {
 235         .driver = {
 236                 .name = "imx-pgc-pd",
 237         },
 238         .probe = imx_pgc_power_domain_probe,
 239         .remove = imx_pgc_power_domain_remove,
 240         .id_table = imx_pgc_power_domain_id,
 241 };
 242 builtin_platform_driver(imx_pgc_power_domain_driver)
 243
 244 #define GPC_PGC_DOMAIN_ARM      0
 245 #define GPC_PGC_DOMAIN_PU       1
 246 #define GPC_PGC_DOMAIN_DISPLAY  2
 247
 248 static struct genpd_power_state imx6_pm_domain_pu_state = {
 249         .power_off_latency_ns = 25000,
 250         .power_on_latency_ns = 2000000,
 251 };
 252
 253 static struct imx_pm_domain imx_gpc_domains[] = {
 254         {
 255                 .base = {
 256                         .name = "ARM",
 257                 },
 258         }, {
 259                 .base = {
 260                         .name = "PU",
 261                         .power_off = imx6_pm_domain_power_off,
 262                         .power_on = imx6_pm_domain_power_on,
 263                         .states = &imx6_pm_domain_pu_state,
 264                         .state_count = 1,
 265                 },
 266                 .reg_offs = 0x260,
 267                 .cntr_pdn_bit = 0,
 268         }, {
 269                 .base = {
 270                         .name = "DISPLAY",
 271                         .power_off = imx6_pm_domain_power_off,
 272                         .power_on = imx6_pm_domain_power_on,
 273                 },
 274                 .reg_offs = 0x240,
 275                 .cntr_pdn_bit = 4,
 276         }
 277 };
 278
 279 struct imx_gpc_dt_data {
 280         int num_domains;
 281         bool err009619_present;
 282 };
 283
 284 static const struct imx_gpc_dt_data imx6q_dt_data = {
 285         .num_domains = 2,
 286         .err009619_present = false,
 287 };
 288
 289 static const struct imx_gpc_dt_data imx6qp_dt_data = {
 290         .num_domains = 2,
 291         .err009619_present = true,
 292 };
 293
 294 static const struct imx_gpc_dt_data imx6sl_dt_data = {
 295         .num_domains = 3,
 296         .err009619_present = false,
 297 };
 298
 299 static const struct of_device_id imx_gpc_dt_ids[] = {
 300         { .compatible = "fsl,imx6q-gpc", .data = &imx6q_dt_data },
 301         { .compatible = "fsl,imx6qp-gpc", .data = &imx6qp_dt_data },
 302         { .compatible = "fsl,imx6sl-gpc", .data = &imx6sl_dt_data },
 303         { }
 304 };
 305
 306 static const struct regmap_config imx_gpc_regmap_config = {
 307         .reg_bits = 32,
 308         .val_bits = 32,
 309         .reg_stride = 4,
 310         .max_register = 0x2ac,
 311 };
 312
 313 static struct generic_pm_domain *imx_gpc_onecell_domains[] = {
 314         &imx_gpc_domains[0].base,
 315         &imx_gpc_domains[1].base,
 316 };
 317
 318 static struct genpd_onecell_data imx_gpc_onecell_data = {
 319         .domains = imx_gpc_onecell_domains,
 320         .num_domains = 2,
 321 };
 322
 323 static int imx_gpc_old_dt_init(struct device *dev, struct regmap *regmap,
 324                                unsigned int num_domains)
 325 {
 326         struct imx_pm_domain *domain;
 327         int i, ret;
 328
 329         for (i = 0; i < num_domains; i++) {
 330                 domain = &imx_gpc_domains[i];
 331                 domain->regmap = regmap;
 332                 domain->ipg_rate_mhz = 66;
 333
 334                 if (i == 1) {
 335                         domain->supply = devm_regulator_get(dev, "pu");
 336                         if (IS_ERR(domain->supply))
 337                                 return PTR_ERR(domain->supply);;
 338
 339                         ret = imx_pgc_get_clocks(dev, domain);
 340                         if (ret)
 341                                 goto clk_err;
 342
 343                         domain->base.power_on(&domain->base);
 344                 }
 345         }
 346
 347         for (i = 0; i < num_domains; i++)
 348                 pm_genpd_init(&imx_gpc_domains[i].base, NULL, false);
 349
 350         if (IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS)) {
 351                 ret = of_genpd_add_provider_onecell(dev->of_node,
 352                                                     &imx_gpc_onecell_data);
 353                 if (ret)
 354                         goto genpd_err;
 355         }
 356
 357         return 0;
 358
 359 genpd_err:
 360         for (i = 0; i < num_domains; i++)
 361                 pm_genpd_remove(&imx_gpc_domains[i].base);
 362         imx_pgc_put_clocks(&imx_gpc_domains[GPC_PGC_DOMAIN_PU]);
 363 clk_err:
 364         return ret;
 365 }
 366
 367 static int imx_gpc_probe(struct platform_device *pdev)
 368 {
 369         const struct of_device_id *of_id =
 370                         of_match_device(imx_gpc_dt_ids, &pdev->dev);
 371         const struct imx_gpc_dt_data *of_id_data = of_id->data;
 372         struct device_node *pgc_node;
 373         struct regmap *regmap;
 374         struct resource *res;
 375         void __iomem *base;
 376         int ret;
 377
 378         pgc_node = of_get_child_by_name(pdev->dev.of_node, "pgc");
 379
 380         /* bail out if DT too old and doesn't provide the necessary info */
 381         if (!of_property_read_bool(pdev->dev.of_node, "#power-domain-cells") &&
 382             !pgc_node)
 383                 return 0;
 384
 385         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 386         base = devm_ioremap_resource(&pdev->dev, res);
 387         if (IS_ERR(base))
 388                 return PTR_ERR(base);
 389
 390         regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
 391                                            &imx_gpc_regmap_config);
 392         if (IS_ERR(regmap)) {
 393                 ret = PTR_ERR(regmap);
 394                 dev_err(&pdev->dev, "failed to init regmap: %d\n",
 395                         ret);
 396                 return ret;
 397         }
 398
 399         /* Disable PU power down in normal operation if ERR009619 is present */
 400         if (of_id_data->err009619_present)
 401                 imx_gpc_domains[GPC_PGC_DOMAIN_PU].flags |=
 402                                 PGC_DOMAIN_FLAG_NO_PD;
 403
 404         if (!pgc_node) {
 405                 ret = imx_gpc_old_dt_init(&pdev->dev, regmap,
 406                                           of_id_data->num_domains);
 407                 if (ret)
 408                         return ret;
 409         } else {
 410                 struct imx_pm_domain *domain;
 411                 struct platform_device *pd_pdev;
 412                 struct device_node *np;
 413                 struct clk *ipg_clk;
 414                 unsigned int ipg_rate_mhz;
 415                 int domain_index;
 416
 417                 ipg_clk = devm_clk_get(&pdev->dev, "ipg");
 418                 if (IS_ERR(ipg_clk))
 419                         return PTR_ERR(ipg_clk);
 420                 ipg_rate_mhz = clk_get_rate(ipg_clk) / 1000000;
 421
 422                 for_each_child_of_node(pgc_node, np) {
 423                         ret = of_property_read_u32(np, "reg", &domain_index);
 424                         if (ret) {
 425                                 of_node_put(np);
 426                                 return ret;
 427                         }
 428                         if (domain_index >= of_id_data->num_domains)
 429                                 continue;
 430
 431                         domain = &imx_gpc_domains[domain_index];
 432                         domain->regmap = regmap;
 433                         domain->ipg_rate_mhz = ipg_rate_mhz;
 434
 435                         pd_pdev = platform_device_alloc("imx-pgc-power-domain",
 436                                                         domain_index);
 437                         if (!pd_pdev) {
 438                                 of_node_put(np);
 439                                 return -ENOMEM;
 440                         }
 441                         pd_pdev->dev.platform_data = domain;
 442                         pd_pdev->dev.parent = &pdev->dev;
 443                         pd_pdev->dev.of_node = np;
 444
 445                         ret = platform_device_add(pd_pdev);
 446                         if (ret) {
 447                                 platform_device_put(pd_pdev);
 448                                 of_node_put(np);
 449                                 return ret;
 450                         }
 451                 }
 452         }
 453
 454         return 0;
 455 }
 456
 457 static int imx_gpc_remove(struct platform_device *pdev)
 458 {
 459         int ret;
 460
 461         /*
 462          * If the old DT binding is used the toplevel driver needs to
 463          * de-register the power domains
 464          */
 465         if (!of_get_child_by_name(pdev->dev.of_node, "pgc")) {
 466                 of_genpd_del_provider(pdev->dev.of_node);
 467
 468                 ret = pm_genpd_remove(&imx_gpc_domains[GPC_PGC_DOMAIN_PU].base);
 469                 if (ret)
 470                         return ret;
 471                 imx_pgc_put_clocks(&imx_gpc_domains[GPC_PGC_DOMAIN_PU]);
 472
 473                 ret = pm_genpd_remove(&imx_gpc_domains[GPC_PGC_DOMAIN_ARM].base);
 474                 if (ret)
 475                         return ret;
 476         }
 477
 478         return 0;
 479 }
 480
 481 static struct platform_driver imx_gpc_driver = {
 482         .driver = {
 483                 .name = "imx-gpc",
 484                 .of_match_table = imx_gpc_dt_ids,
 485         },
 486         .probe = imx_gpc_probe,
 487         .remove = imx_gpc_remove,
 488 };
 489 builtin_platform_driver(imx_gpc_driver)