developer | 2cdaeb1 | 2022-10-04 20:25:05 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * Copyright (c) 2020 Collabora Ltd. |
| 4 | */ |
| 5 | #include <linux/clk.h> |
| 6 | #include <linux/clk-provider.h> |
| 7 | #include <linux/init.h> |
| 8 | #include <linux/io.h> |
| 9 | #include <linux/iopoll.h> |
| 10 | #include <linux/mfd/syscon.h> |
| 11 | #include <linux/of_clk.h> |
| 12 | #include <linux/of_device.h> |
| 13 | #include <linux/platform_device.h> |
| 14 | #include <linux/pm_domain.h> |
| 15 | #include <linux/regmap.h> |
| 16 | #include <linux/soc/mediatek/infracfg.h> |
| 17 | #include <linux/regulator/consumer.h> |
| 18 | |
| 19 | #include "mt7988-pm-domains.h" |
| 20 | |
| 21 | #define MTK_POLL_DELAY_US 30 |
| 22 | #define MTK_POLL_TIMEOUT USEC_PER_SEC |
| 23 | |
| 24 | struct scpsys_domain { |
| 25 | struct generic_pm_domain genpd; |
| 26 | const struct scpsys_domain_data *data; |
| 27 | struct scpsys *scpsys; |
| 28 | int num_clks; |
| 29 | struct clk_bulk_data *clks; |
| 30 | int num_subsys_clks; |
| 31 | struct clk_bulk_data *subsys_clks; |
| 32 | struct regmap *infracfg; |
| 33 | struct regulator *supply; |
| 34 | }; |
| 35 | |
| 36 | struct scpsys { |
| 37 | struct device *dev; |
| 38 | struct regmap *base; |
| 39 | const struct scpsys_soc_data *soc_data; |
| 40 | struct genpd_onecell_data pd_data; |
| 41 | struct generic_pm_domain *domains[]; |
| 42 | }; |
| 43 | |
| 44 | static inline int mtk_regmap_set_bits(struct regmap *map, unsigned int reg, |
| 45 | unsigned int bits) |
| 46 | { |
| 47 | return regmap_update_bits_base(map, reg, bits, bits, NULL, false, |
| 48 | false); |
| 49 | } |
| 50 | |
| 51 | static inline int mtk_regmap_clear_bits(struct regmap *map, unsigned int reg, |
| 52 | unsigned int bits) |
| 53 | { |
| 54 | return regmap_update_bits_base(map, reg, bits, 0, NULL, false, false); |
| 55 | } |
| 56 | |
| 57 | #define to_scpsys_domain(gpd) container_of(gpd, struct scpsys_domain, genpd) |
| 58 | |
| 59 | static bool scpsys_domain_is_on(struct scpsys_domain *pd) |
| 60 | { |
| 61 | struct scpsys *scpsys = pd->scpsys; |
| 62 | u32 status = 0, status2 = 0; |
| 63 | |
| 64 | regmap_read(scpsys->base, pd->data->pwr_sta_offs, &status); |
| 65 | status &= pd->data->sta_mask; |
| 66 | |
| 67 | regmap_read(scpsys->base, pd->data->pwr_sta_2nd_offs, &status2); |
| 68 | status2 &= pd->data->sta_2nd_mask; |
| 69 | |
| 70 | /* A domain is on when both status bits are set. */ |
| 71 | return status && status2; |
| 72 | } |
| 73 | |
| 74 | static int scpsys_sram_enable(struct scpsys_domain *pd) |
| 75 | { |
| 76 | u32 pdn_ack = pd->data->sram_pdn_ack_bit; |
| 77 | u32 pdn_2nd_ack = pd->data->sram_2nd_pdn_ack_bit; |
| 78 | struct scpsys *scpsys = pd->scpsys; |
| 79 | unsigned int tmp = 0; |
| 80 | int ret; |
| 81 | |
| 82 | if (pd->data->sram_pdn_bit) { |
| 83 | mtk_regmap_clear_bits(scpsys->base, pd->data->sram_ctrl_offs, |
| 84 | pd->data->sram_pdn_bit); |
| 85 | |
| 86 | /* Either wait until SRAM_PDN_ACK all 1 or 0 */ |
| 87 | ret = regmap_read_poll_timeout(scpsys->base, |
| 88 | pd->data->sram_ctrl_offs, tmp, |
| 89 | (tmp & pdn_ack) == 0, |
| 90 | MTK_POLL_DELAY_US, |
| 91 | MTK_POLL_TIMEOUT); |
| 92 | if (ret < 0) |
| 93 | return ret; |
| 94 | } |
| 95 | if (pd->data->sram_2nd_pdn_bit) { |
| 96 | /* sram pdn 2nd for special mtcmos */ |
| 97 | mtk_regmap_clear_bits(scpsys->base, |
| 98 | pd->data->sram_2nd_ctrl_offs, |
| 99 | pd->data->sram_2nd_pdn_bit); |
| 100 | |
| 101 | ret = regmap_read_poll_timeout(scpsys->base, |
| 102 | pd->data->sram_2nd_ctrl_offs, |
| 103 | tmp, (tmp & pdn_2nd_ack) == 0, |
| 104 | MTK_POLL_DELAY_US, |
| 105 | MTK_POLL_TIMEOUT); |
| 106 | if (ret < 0) |
| 107 | return ret; |
| 108 | } |
| 109 | if (pd->data->sram_clk_iso_bit) { |
| 110 | mtk_regmap_clear_bits(scpsys->base, pd->data->sram_ctrl_offs, |
| 111 | pd->data->sram_clk_iso_bit); |
| 112 | } |
| 113 | if (pd->data->sram_clk_dis_bit) { |
| 114 | mtk_regmap_clear_bits(scpsys->base, pd->data->sram_ctrl_offs, |
| 115 | pd->data->sram_clk_dis_bit); |
| 116 | } |
| 117 | if (pd->data->sram_2nd_clk_iso_bit) { |
| 118 | mtk_regmap_clear_bits(scpsys->base, |
| 119 | pd->data->sram_2nd_ctrl_offs, |
| 120 | pd->data->sram_2nd_clk_iso_bit); |
| 121 | } |
| 122 | if (pd->data->sram_2nd_clk_dis_bit) { |
| 123 | mtk_regmap_clear_bits(scpsys->base, |
| 124 | pd->data->sram_2nd_ctrl_offs, |
| 125 | pd->data->sram_2nd_clk_dis_bit); |
| 126 | } |
| 127 | |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | static int scpsys_sram_disable(struct scpsys_domain *pd) |
| 132 | { |
| 133 | u32 pdn_ack = pd->data->sram_pdn_ack_bit; |
| 134 | u32 pdn_2nd_ack = pd->data->sram_2nd_pdn_ack_bit; |
| 135 | struct scpsys *scpsys = pd->scpsys; |
| 136 | unsigned int tmp = 0; |
| 137 | int ret; |
| 138 | |
| 139 | if (pd->data->sram_2nd_clk_dis_bit) { |
| 140 | mtk_regmap_set_bits(scpsys->base, pd->data->sram_2nd_ctrl_offs, |
| 141 | pd->data->sram_2nd_clk_dis_bit); |
| 142 | } |
| 143 | if (pd->data->sram_clk_iso_bit) { |
| 144 | mtk_regmap_set_bits(scpsys->base, pd->data->sram_ctrl_offs, |
| 145 | pd->data->sram_clk_iso_bit); |
| 146 | udelay(1); |
| 147 | } |
| 148 | if (pd->data->sram_pdn_bit) { |
| 149 | mtk_regmap_set_bits(scpsys->base, pd->data->sram_ctrl_offs, |
| 150 | pd->data->sram_pdn_bit); |
| 151 | } |
| 152 | |
| 153 | if (pd->data->sram_2nd_clk_iso_bit) { |
| 154 | mtk_regmap_set_bits(scpsys->base, pd->data->sram_2nd_ctrl_offs, |
| 155 | pd->data->sram_2nd_clk_iso_bit); |
| 156 | udelay(1); |
| 157 | } |
| 158 | if (pd->data->sram_2nd_pdn_bit) { |
| 159 | mtk_regmap_set_bits(scpsys->base, pd->data->sram_2nd_ctrl_offs, |
| 160 | pd->data->sram_2nd_pdn_bit); |
| 161 | } |
| 162 | |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | static int scpsys_regulator_get(struct generic_pm_domain *genpd) |
| 167 | { |
| 168 | struct scpsys_domain *pd = |
| 169 | container_of(genpd, struct scpsys_domain, genpd); |
| 170 | struct device_node *node; |
| 171 | struct device_node *root; |
| 172 | |
| 173 | if (MTK_SCPD_CAPS(pd, MTK_SCPD_DOMAIN_SUPPLY) && !pd->supply) { |
| 174 | root = pd->scpsys->dev->of_node; |
| 175 | node = of_find_node_by_name(root, genpd->name); |
| 176 | if (node) { |
| 177 | pd->scpsys->dev->of_node = node; |
| 178 | pd->supply = |
| 179 | devm_regulator_get(pd->scpsys->dev, "domain"); |
| 180 | pd->scpsys->dev->of_node = root; |
| 181 | if (IS_ERR(pd->supply)) |
| 182 | return -EINVAL; |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | static int scpsys_regulator_enable(struct generic_pm_domain *genpd) |
| 190 | { |
| 191 | struct scpsys_domain *pd = |
| 192 | container_of(genpd, struct scpsys_domain, genpd); |
| 193 | int ret = scpsys_regulator_get(genpd); |
| 194 | |
| 195 | if (ret) |
| 196 | return ret; |
| 197 | |
| 198 | return pd->supply ? regulator_enable(pd->supply) : 0; |
| 199 | } |
| 200 | |
| 201 | static int scpsys_regulator_disable(struct generic_pm_domain *genpd) |
| 202 | { |
| 203 | struct scpsys_domain *pd = |
| 204 | container_of(genpd, struct scpsys_domain, genpd); |
| 205 | |
| 206 | return pd->supply ? regulator_disable(pd->supply) : 0; |
| 207 | } |
| 208 | |
| 209 | static int scpsys_power_on(struct generic_pm_domain *genpd) |
| 210 | { |
| 211 | struct scpsys_domain *pd = |
| 212 | container_of(genpd, struct scpsys_domain, genpd); |
| 213 | struct scpsys *scpsys = pd->scpsys; |
| 214 | bool tmp; |
| 215 | int ret; |
| 216 | |
| 217 | ret = scpsys_regulator_enable(genpd); |
| 218 | if (ret) |
| 219 | return ret; |
| 220 | |
| 221 | ret = clk_bulk_prepare_enable(pd->num_clks, pd->clks); |
| 222 | if (ret) |
| 223 | goto err_pwr_ack; |
| 224 | |
| 225 | /* subsys power on */ |
| 226 | mtk_regmap_set_bits(scpsys->base, pd->data->pwr_on_offs, |
| 227 | pd->data->pwr_on_bit); |
| 228 | mtk_regmap_set_bits(scpsys->base, pd->data->pwr_on_2nd_offs, |
| 229 | pd->data->pwr_on_2nd_bit); |
| 230 | |
| 231 | /* wait until PWR_ACK = 1 */ |
| 232 | ret = readx_poll_timeout(scpsys_domain_is_on, pd, tmp, tmp, |
| 233 | MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT); |
| 234 | if (ret < 0) |
| 235 | goto err_pwr_ack; |
| 236 | udelay(30); |
| 237 | |
| 238 | if (pd->data->pwr_clamp_bit) { |
| 239 | mtk_regmap_clear_bits(scpsys->base, pd->data->pwr_on_offs, |
| 240 | pd->data->pwr_clamp_bit); |
| 241 | udelay(30); |
| 242 | } |
| 243 | |
| 244 | if (pd->data->pwr_rst_bit) |
| 245 | mtk_regmap_set_bits(scpsys->base, pd->data->pwr_on_offs, |
| 246 | pd->data->pwr_rst_bit); |
| 247 | |
| 248 | ret = clk_bulk_prepare_enable(pd->num_subsys_clks, pd->subsys_clks); |
| 249 | if (ret) |
| 250 | goto err_disable_subsys_clks; |
| 251 | |
| 252 | ret = scpsys_sram_enable(pd); |
| 253 | if (ret < 0) |
| 254 | goto err_disable_sram; |
| 255 | |
| 256 | return 0; |
| 257 | |
| 258 | err_disable_sram: |
| 259 | scpsys_sram_disable(pd); |
| 260 | err_disable_subsys_clks: |
| 261 | clk_bulk_disable_unprepare(pd->num_subsys_clks, pd->subsys_clks); |
| 262 | err_pwr_ack: |
| 263 | clk_bulk_disable_unprepare(pd->num_clks, pd->clks); |
| 264 | err_reg: |
| 265 | scpsys_regulator_disable(genpd); |
| 266 | return ret; |
| 267 | } |
| 268 | |
| 269 | static int scpsys_power_off(struct generic_pm_domain *genpd) |
| 270 | { |
| 271 | struct scpsys_domain *pd = |
| 272 | container_of(genpd, struct scpsys_domain, genpd); |
| 273 | struct scpsys *scpsys = pd->scpsys; |
| 274 | bool tmp; |
| 275 | int ret; |
| 276 | |
| 277 | ret = scpsys_sram_disable(pd); |
| 278 | if (ret < 0) |
| 279 | return ret; |
| 280 | |
| 281 | clk_bulk_disable_unprepare(pd->num_subsys_clks, pd->subsys_clks); |
| 282 | |
| 283 | if (pd->data->pwr_clamp_bit) { |
| 284 | mtk_regmap_set_bits(scpsys->base, pd->data->pwr_on_offs, |
| 285 | pd->data->pwr_clamp_bit); |
| 286 | udelay(30); |
| 287 | } |
| 288 | if (pd->data->pwr_rst_bit) |
| 289 | mtk_regmap_clear_bits(scpsys->base, pd->data->pwr_on_offs, |
| 290 | pd->data->pwr_rst_bit); |
| 291 | |
| 292 | mtk_regmap_clear_bits(scpsys->base, pd->data->pwr_on_offs, |
| 293 | pd->data->pwr_on_bit); |
| 294 | mtk_regmap_clear_bits(scpsys->base, pd->data->pwr_on_2nd_offs, |
| 295 | pd->data->pwr_on_2nd_bit); |
| 296 | |
| 297 | clk_bulk_disable_unprepare(pd->num_clks, pd->clks); |
| 298 | scpsys_regulator_disable(genpd); |
| 299 | |
| 300 | return 0; |
| 301 | } |
| 302 | |
| 303 | static struct generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, |
| 304 | struct device_node *node) |
| 305 | { |
| 306 | const struct scpsys_domain_data *domain_data; |
| 307 | struct scpsys_domain *pd; |
| 308 | struct property *prop; |
| 309 | const char *clk_name; |
| 310 | int i, ret, num_clks; |
| 311 | struct clk *clk; |
| 312 | struct device_node *smi_node; |
| 313 | struct device_node *larb_node; |
| 314 | int clk_ind = 0; |
| 315 | u32 id; |
| 316 | |
| 317 | ret = of_property_read_u32(node, "reg", &id); |
| 318 | if (ret) { |
| 319 | dev_err(scpsys->dev, |
| 320 | "%pOF: failed to retrieve domain id from reg: %d\n", |
| 321 | node, ret); |
| 322 | return ERR_PTR(-EINVAL); |
| 323 | } |
| 324 | |
| 325 | if (id >= scpsys->soc_data->num_domains) { |
| 326 | dev_err(scpsys->dev, "%pOF: invalid domain id %d\n", node, id); |
| 327 | return ERR_PTR(-EINVAL); |
| 328 | } |
| 329 | |
| 330 | domain_data = &scpsys->soc_data->domains_data[id]; |
| 331 | if (domain_data->sta_mask == 0) { |
| 332 | dev_err(scpsys->dev, "%pOF: undefined domain id %d\n", node, |
| 333 | id); |
| 334 | return ERR_PTR(-EINVAL); |
| 335 | } |
| 336 | |
| 337 | pd = devm_kzalloc(scpsys->dev, sizeof(*pd), GFP_KERNEL); |
| 338 | if (!pd) |
| 339 | return ERR_PTR(-ENOMEM); |
| 340 | |
| 341 | pd->data = domain_data; |
| 342 | pd->scpsys = scpsys; |
| 343 | |
| 344 | num_clks = of_clk_get_parent_count(node); |
| 345 | if (num_clks > 0) { |
| 346 | /* Calculate number of subsys_clks */ |
| 347 | of_property_for_each_string(node, "clock-names", prop, |
| 348 | clk_name) { |
| 349 | char *subsys; |
| 350 | |
| 351 | subsys = strchr(clk_name, '-'); |
| 352 | if (subsys) |
| 353 | pd->num_subsys_clks++; |
| 354 | else |
| 355 | pd->num_clks++; |
| 356 | } |
| 357 | |
| 358 | pd->clks = devm_kcalloc(scpsys->dev, pd->num_clks, |
| 359 | sizeof(*pd->clks), GFP_KERNEL); |
| 360 | if (!pd->clks) |
| 361 | return ERR_PTR(-ENOMEM); |
| 362 | |
| 363 | pd->subsys_clks = |
| 364 | devm_kcalloc(scpsys->dev, pd->num_subsys_clks, |
| 365 | sizeof(*pd->subsys_clks), GFP_KERNEL); |
| 366 | if (!pd->subsys_clks) |
| 367 | return ERR_PTR(-ENOMEM); |
| 368 | } |
| 369 | |
| 370 | for (i = 0; i < pd->num_clks; i++) { |
| 371 | clk = of_clk_get(node, i); |
| 372 | if (IS_ERR(clk)) { |
| 373 | ret = PTR_ERR(clk); |
| 374 | dev_err(scpsys->dev, |
| 375 | "%pOF: failed to get clk at index %d: %d\n", |
| 376 | node, i, ret); |
| 377 | goto err_put_clocks; |
| 378 | } |
| 379 | |
| 380 | pd->clks[clk_ind++].clk = clk; |
| 381 | } |
| 382 | |
| 383 | for (i = 0; i < pd->num_subsys_clks; i++) { |
| 384 | clk = of_clk_get(node, i + clk_ind); |
| 385 | if (IS_ERR(clk)) { |
| 386 | ret = PTR_ERR(clk); |
| 387 | dev_err(scpsys->dev, |
| 388 | "%pOF: failed to get clk at index %d: %d\n", |
| 389 | node, i + clk_ind, ret); |
| 390 | goto err_put_subsys_clocks; |
| 391 | } |
| 392 | |
| 393 | pd->subsys_clks[i].clk = clk; |
| 394 | } |
| 395 | |
| 396 | /* |
| 397 | * Initially turn on all domains to make the domains usable |
| 398 | * with !CONFIG_PM and to get the hardware in sync with the |
| 399 | * software. The unused domains will be switched off during |
| 400 | * late_init time. |
| 401 | */ |
| 402 | if (MTK_SCPD_CAPS(pd, MTK_SCPD_KEEP_DEFAULT_OFF)) { |
| 403 | if (scpsys_domain_is_on(pd)) |
| 404 | dev_warn( |
| 405 | scpsys->dev, |
| 406 | "%pOF: A default off power domain has been ON\n", |
| 407 | node); |
| 408 | } else { |
| 409 | ret = scpsys_power_on(&pd->genpd); |
| 410 | if (ret < 0) { |
| 411 | dev_err(scpsys->dev, |
| 412 | "%pOF: failed to power on domain: %d\n", node, |
| 413 | ret); |
| 414 | goto err_put_subsys_clocks; |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | if (scpsys->domains[id]) { |
| 419 | ret = -EINVAL; |
| 420 | dev_err(scpsys->dev, |
| 421 | "power domain with id %d already exists, check your device-tree\n", |
| 422 | id); |
| 423 | goto err_put_subsys_clocks; |
| 424 | } |
| 425 | |
| 426 | pd->genpd.name = node->name; |
| 427 | pd->genpd.power_off = scpsys_power_off; |
| 428 | pd->genpd.power_on = scpsys_power_on; |
| 429 | |
| 430 | if (MTK_SCPD_CAPS(pd, MTK_SCPD_ACTIVE_WAKEUP)) |
| 431 | pd->genpd.flags |= GENPD_FLAG_ACTIVE_WAKEUP; |
| 432 | |
| 433 | if (MTK_SCPD_CAPS(pd, MTK_SCPD_KEEP_DEFAULT_OFF)) |
| 434 | pm_genpd_init(&pd->genpd, NULL, true); |
| 435 | else |
| 436 | pm_genpd_init(&pd->genpd, NULL, false); |
| 437 | |
| 438 | scpsys->domains[id] = &pd->genpd; |
| 439 | |
| 440 | return scpsys->pd_data.domains[id]; |
| 441 | |
| 442 | err_put_subsys_clocks: |
| 443 | clk_bulk_put(pd->num_subsys_clks, pd->subsys_clks); |
| 444 | err_put_clocks: |
| 445 | clk_bulk_put(pd->num_clks, pd->clks); |
| 446 | return ERR_PTR(ret); |
| 447 | } |
| 448 | |
| 449 | static int scpsys_add_subdomain(struct scpsys *scpsys, |
| 450 | struct device_node *parent) |
| 451 | { |
| 452 | struct generic_pm_domain *child_pd, *parent_pd; |
| 453 | struct device_node *child; |
| 454 | int ret; |
| 455 | |
| 456 | for_each_child_of_node(parent, child) { |
| 457 | u32 id; |
| 458 | |
| 459 | ret = of_property_read_u32(parent, "reg", &id); |
| 460 | if (ret) { |
| 461 | dev_err(scpsys->dev, |
| 462 | "%pOF: failed to get parent domain id\n", |
| 463 | child); |
| 464 | goto err_put_node; |
| 465 | } |
| 466 | |
| 467 | if (!scpsys->pd_data.domains[id]) { |
| 468 | ret = -EINVAL; |
| 469 | dev_err(scpsys->dev, |
| 470 | "power domain with id %d does not exist\n", id); |
| 471 | goto err_put_node; |
| 472 | } |
| 473 | |
| 474 | parent_pd = scpsys->pd_data.domains[id]; |
| 475 | |
| 476 | child_pd = scpsys_add_one_domain(scpsys, child); |
| 477 | if (IS_ERR(child_pd)) { |
| 478 | ret = PTR_ERR(child_pd); |
| 479 | dev_err(scpsys->dev, |
| 480 | "%pOF: failed to get child domain id\n", child); |
| 481 | goto err_put_node; |
| 482 | } |
| 483 | |
| 484 | ret = pm_genpd_add_subdomain(parent_pd, child_pd); |
| 485 | if (ret) { |
| 486 | dev_err(scpsys->dev, |
| 487 | "failed to add %s subdomain to parent %s\n", |
| 488 | child_pd->name, parent_pd->name); |
| 489 | goto err_put_node; |
| 490 | } else { |
| 491 | dev_dbg(scpsys->dev, "%s add subdomain: %s\n", |
| 492 | parent_pd->name, child_pd->name); |
| 493 | } |
| 494 | |
| 495 | /* recursive call to add all subdomains */ |
| 496 | ret = scpsys_add_subdomain(scpsys, child); |
| 497 | if (ret) |
| 498 | goto err_put_node; |
| 499 | } |
| 500 | |
| 501 | return 0; |
| 502 | |
| 503 | err_put_node: |
| 504 | of_node_put(child); |
| 505 | return ret; |
| 506 | } |
| 507 | |
| 508 | static void scpsys_remove_one_domain(struct scpsys_domain *pd) |
| 509 | { |
| 510 | int ret; |
| 511 | |
| 512 | if (scpsys_domain_is_on(pd)) |
| 513 | scpsys_power_off(&pd->genpd); |
| 514 | |
| 515 | /* |
| 516 | * We're in the error cleanup already, so we only complain, |
| 517 | * but won't emit another error on top of the original one. |
| 518 | */ |
| 519 | ret = pm_genpd_remove(&pd->genpd); |
| 520 | if (ret < 0) |
| 521 | dev_err(pd->scpsys->dev, |
| 522 | "failed to remove domain '%s' : %d - state may be inconsistent\n", |
| 523 | pd->genpd.name, ret); |
| 524 | |
| 525 | clk_bulk_put(pd->num_clks, pd->clks); |
| 526 | clk_bulk_put(pd->num_subsys_clks, pd->subsys_clks); |
| 527 | } |
| 528 | |
| 529 | static void scpsys_domain_cleanup(struct scpsys *scpsys) |
| 530 | { |
| 531 | struct generic_pm_domain *genpd; |
| 532 | struct scpsys_domain *pd; |
| 533 | int i; |
| 534 | |
| 535 | for (i = scpsys->pd_data.num_domains - 1; i >= 0; i--) { |
| 536 | genpd = scpsys->pd_data.domains[i]; |
| 537 | if (genpd) { |
| 538 | pd = to_scpsys_domain(genpd); |
| 539 | scpsys_remove_one_domain(pd); |
| 540 | } |
| 541 | } |
| 542 | } |
| 543 | |
| 544 | static const struct of_device_id scpsys_of_match[] = { |
| 545 | { |
| 546 | .compatible = "mediatek,mt7988-power-controller", |
| 547 | .data = &mt7988_scpsys_data, |
| 548 | }, |
| 549 | {} |
| 550 | }; |
| 551 | |
| 552 | static int scpsys_probe(struct platform_device *pdev) |
| 553 | { |
| 554 | struct device *dev = &pdev->dev; |
| 555 | struct device_node *np = dev->of_node; |
| 556 | const struct scpsys_soc_data *soc; |
| 557 | struct device_node *node; |
| 558 | struct scpsys *scpsys; |
| 559 | struct resource *res; |
| 560 | int ret; |
| 561 | |
| 562 | soc = of_device_get_match_data(&pdev->dev); |
| 563 | if (!soc) { |
| 564 | dev_err(&pdev->dev, "no power controller data\n"); |
| 565 | return -EINVAL; |
| 566 | } |
| 567 | |
| 568 | scpsys = devm_kzalloc(dev, |
| 569 | struct_size(scpsys, domains, soc->num_domains), |
| 570 | GFP_KERNEL); |
| 571 | if (!scpsys) |
| 572 | return -ENOMEM; |
| 573 | |
| 574 | scpsys->dev = dev; |
| 575 | scpsys->soc_data = soc; |
| 576 | |
| 577 | scpsys->pd_data.domains = scpsys->domains; |
| 578 | scpsys->pd_data.num_domains = soc->num_domains; |
| 579 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 580 | scpsys->base = syscon_node_to_regmap(np); |
| 581 | if (IS_ERR(scpsys->base)) { |
| 582 | dev_err(dev, "no regmap available\n"); |
| 583 | return PTR_ERR(scpsys->base); |
| 584 | } |
| 585 | |
| 586 | ret = -ENODEV; |
| 587 | for_each_available_child_of_node(np, node) { |
| 588 | struct generic_pm_domain *domain; |
| 589 | |
| 590 | domain = scpsys_add_one_domain(scpsys, node); |
| 591 | if (IS_ERR(domain)) { |
| 592 | ret = PTR_ERR(domain); |
| 593 | of_node_put(node); |
| 594 | goto err_cleanup_domains; |
| 595 | } |
| 596 | |
| 597 | ret = scpsys_add_subdomain(scpsys, node); |
| 598 | if (ret) { |
| 599 | of_node_put(node); |
| 600 | goto err_cleanup_domains; |
| 601 | } |
| 602 | } |
| 603 | |
| 604 | if (ret) { |
| 605 | dev_dbg(dev, "no power domains present\n"); |
| 606 | return ret; |
| 607 | } |
| 608 | |
| 609 | ret = of_genpd_add_provider_onecell(np, &scpsys->pd_data); |
| 610 | if (ret) { |
| 611 | dev_err(dev, "failed to add provider: %d\n", ret); |
| 612 | goto err_cleanup_domains; |
| 613 | } |
| 614 | |
| 615 | return 0; |
| 616 | |
| 617 | err_cleanup_domains: |
| 618 | scpsys_domain_cleanup(scpsys); |
| 619 | return ret; |
| 620 | } |
| 621 | |
| 622 | static struct platform_driver scpsys_pm_domain_driver = { |
| 623 | .probe = scpsys_probe, |
| 624 | .driver = { |
| 625 | .name = "mtk-power-controller", |
| 626 | .suppress_bind_attrs = true, |
| 627 | .of_match_table = scpsys_of_match, |
| 628 | }, |
| 629 | }; |
| 630 | builtin_platform_driver(scpsys_pm_domain_driver); |