1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2016-2017, NVIDIA CORPORATION. All rights reserved 4 */ 5 6 #include <linux/of.h> 7 #include <linux/platform_device.h> 8 #include <linux/pm_domain.h> 9 #include <linux/slab.h> 10 11 #include <soc/tegra/bpmp.h> 12 #include <soc/tegra/bpmp-abi.h> 13 14 struct tegra_powergate_info { 15 unsigned int id; 16 char *name; 17 }; 18 19 struct tegra_powergate { 20 struct generic_pm_domain genpd; 21 struct tegra_bpmp *bpmp; 22 unsigned int id; 23 }; 24 25 static inline struct tegra_powergate * 26 to_tegra_powergate(struct generic_pm_domain *genpd) 27 { 28 return container_of(genpd, struct tegra_powergate, genpd); 29 } 30 31 static int tegra_bpmp_powergate_set_state(struct tegra_bpmp *bpmp, 32 unsigned int id, u32 state) 33 { 34 struct mrq_pg_request request; 35 struct tegra_bpmp_message msg; 36 int err; 37 38 memset(&request, 0, sizeof(request)); 39 request.cmd = CMD_PG_SET_STATE; 40 request.id = id; 41 request.set_state.state = state; 42 43 memset(&msg, 0, sizeof(msg)); 44 msg.mrq = MRQ_PG; 45 msg.tx.data = &request; 46 msg.tx.size = sizeof(request); 47 48 err = tegra_bpmp_transfer(bpmp, &msg); 49 if (err < 0) 50 return err; 51 else if (msg.rx.ret < 0) 52 return -EINVAL; 53 54 return 0; 55 } 56 57 static int tegra_bpmp_powergate_get_state(struct tegra_bpmp *bpmp, 58 unsigned int id) 59 { 60 struct mrq_pg_response response; 61 struct mrq_pg_request request; 62 struct tegra_bpmp_message msg; 63 int err; 64 65 memset(&request, 0, sizeof(request)); 66 request.cmd = CMD_PG_GET_STATE; 67 request.id = id; 68 69 memset(&response, 0, sizeof(response)); 70 71 memset(&msg, 0, sizeof(msg)); 72 msg.mrq = MRQ_PG; 73 msg.tx.data = &request; 74 msg.tx.size = sizeof(request); 75 msg.rx.data = &response; 76 msg.rx.size = sizeof(response); 77 78 err = tegra_bpmp_transfer(bpmp, &msg); 79 if (err < 0) 80 return PG_STATE_OFF; 81 else if (msg.rx.ret < 0) 82 return -EINVAL; 83 84 return response.get_state.state; 85 } 86 87 static int tegra_bpmp_powergate_get_max_id(struct tegra_bpmp *bpmp) 88 { 89 struct mrq_pg_response response; 90 struct mrq_pg_request request; 91 struct tegra_bpmp_message msg; 92 int err; 93 94 memset(&request, 0, sizeof(request)); 95 request.cmd = CMD_PG_GET_MAX_ID; 96 97 memset(&response, 0, sizeof(response)); 98 99 memset(&msg, 0, sizeof(msg)); 100 msg.mrq = MRQ_PG; 101 msg.tx.data = &request; 102 msg.tx.size = sizeof(request); 103 msg.rx.data = &response; 104 msg.rx.size = sizeof(response); 105 106 err = tegra_bpmp_transfer(bpmp, &msg); 107 if (err < 0) 108 return err; 109 else if (msg.rx.ret < 0) 110 return -EINVAL; 111 112 return response.get_max_id.max_id; 113 } 114 115 static char *tegra_bpmp_powergate_get_name(struct tegra_bpmp *bpmp, 116 unsigned int id) 117 { 118 struct mrq_pg_response response; 119 struct mrq_pg_request request; 120 struct tegra_bpmp_message msg; 121 int err; 122 123 memset(&request, 0, sizeof(request)); 124 request.cmd = CMD_PG_GET_NAME; 125 request.id = id; 126 127 memset(&response, 0, sizeof(response)); 128 129 memset(&msg, 0, sizeof(msg)); 130 msg.mrq = MRQ_PG; 131 msg.tx.data = &request; 132 msg.tx.size = sizeof(request); 133 msg.rx.data = &response; 134 msg.rx.size = sizeof(response); 135 136 err = tegra_bpmp_transfer(bpmp, &msg); 137 if (err < 0 || msg.rx.ret < 0) 138 return NULL; 139 140 return kstrdup(response.get_name.name, GFP_KERNEL); 141 } 142 143 static inline bool tegra_bpmp_powergate_is_powered(struct tegra_bpmp *bpmp, 144 unsigned int id) 145 { 146 return tegra_bpmp_powergate_get_state(bpmp, id) != PG_STATE_OFF; 147 } 148 149 static int tegra_powergate_power_on(struct generic_pm_domain *domain) 150 { 151 struct tegra_powergate *powergate = to_tegra_powergate(domain); 152 struct tegra_bpmp *bpmp = powergate->bpmp; 153 154 return tegra_bpmp_powergate_set_state(bpmp, powergate->id, 155 PG_STATE_ON); 156 } 157 158 static int tegra_powergate_power_off(struct generic_pm_domain *domain) 159 { 160 struct tegra_powergate *powergate = to_tegra_powergate(domain); 161 struct tegra_bpmp *bpmp = powergate->bpmp; 162 163 return tegra_bpmp_powergate_set_state(bpmp, powergate->id, 164 PG_STATE_OFF); 165 } 166 167 static struct tegra_powergate * 168 tegra_powergate_add(struct tegra_bpmp *bpmp, 169 const struct tegra_powergate_info *info) 170 { 171 struct tegra_powergate *powergate; 172 bool off; 173 int err; 174 175 off = !tegra_bpmp_powergate_is_powered(bpmp, info->id); 176 177 powergate = devm_kzalloc(bpmp->dev, sizeof(*powergate), GFP_KERNEL); 178 if (!powergate) 179 return ERR_PTR(-ENOMEM); 180 181 powergate->id = info->id; 182 powergate->bpmp = bpmp; 183 184 powergate->genpd.name = kstrdup(info->name, GFP_KERNEL); 185 powergate->genpd.power_on = tegra_powergate_power_on; 186 powergate->genpd.power_off = tegra_powergate_power_off; 187 188 err = pm_genpd_init(&powergate->genpd, NULL, off); 189 if (err < 0) { 190 kfree(powergate->genpd.name); 191 return ERR_PTR(err); 192 } 193 194 return powergate; 195 } 196 197 static void tegra_powergate_remove(struct tegra_powergate *powergate) 198 { 199 struct generic_pm_domain *genpd = &powergate->genpd; 200 struct tegra_bpmp *bpmp = powergate->bpmp; 201 int err; 202 203 err = pm_genpd_remove(genpd); 204 if (err < 0) 205 dev_err(bpmp->dev, "failed to remove power domain %s: %d\n", 206 genpd->name, err); 207 208 kfree(genpd->name); 209 } 210 211 static int 212 tegra_bpmp_probe_powergates(struct tegra_bpmp *bpmp, 213 struct tegra_powergate_info **powergatesp) 214 { 215 struct tegra_powergate_info *powergates; 216 unsigned int max_id, id, count = 0; 217 unsigned int num_holes = 0; 218 int err; 219 220 err = tegra_bpmp_powergate_get_max_id(bpmp); 221 if (err < 0) 222 return err; 223 224 max_id = err; 225 226 dev_dbg(bpmp->dev, "maximum powergate ID: %u\n", max_id); 227 228 powergates = kcalloc(max_id + 1, sizeof(*powergates), GFP_KERNEL); 229 if (!powergates) 230 return -ENOMEM; 231 232 for (id = 0; id <= max_id; id++) { 233 struct tegra_powergate_info *info = &powergates[count]; 234 235 info->name = tegra_bpmp_powergate_get_name(bpmp, id); 236 if (!info->name || info->name[0] == '\0') { 237 num_holes++; 238 continue; 239 } 240 241 info->id = id; 242 count++; 243 } 244 245 dev_dbg(bpmp->dev, "holes: %u\n", num_holes); 246 247 *powergatesp = powergates; 248 249 return count; 250 } 251 252 static int tegra_bpmp_add_powergates(struct tegra_bpmp *bpmp, 253 struct tegra_powergate_info *powergates, 254 unsigned int count) 255 { 256 struct genpd_onecell_data *genpd = &bpmp->genpd; 257 struct generic_pm_domain **domains; 258 struct tegra_powergate *powergate; 259 unsigned int i; 260 int err; 261 262 domains = kcalloc(count, sizeof(*domains), GFP_KERNEL); 263 if (!domains) 264 return -ENOMEM; 265 266 for (i = 0; i < count; i++) { 267 powergate = tegra_powergate_add(bpmp, &powergates[i]); 268 if (IS_ERR(powergate)) { 269 err = PTR_ERR(powergate); 270 goto remove; 271 } 272 273 dev_dbg(bpmp->dev, "added power domain %s\n", 274 powergate->genpd.name); 275 domains[i] = &powergate->genpd; 276 } 277 278 genpd->num_domains = count; 279 genpd->domains = domains; 280 281 return 0; 282 283 remove: 284 while (i--) { 285 powergate = to_tegra_powergate(domains[i]); 286 tegra_powergate_remove(powergate); 287 } 288 289 kfree(domains); 290 return err; 291 } 292 293 static void tegra_bpmp_remove_powergates(struct tegra_bpmp *bpmp) 294 { 295 struct genpd_onecell_data *genpd = &bpmp->genpd; 296 unsigned int i = genpd->num_domains; 297 struct tegra_powergate *powergate; 298 299 while (i--) { 300 dev_dbg(bpmp->dev, "removing power domain %s\n", 301 genpd->domains[i]->name); 302 powergate = to_tegra_powergate(genpd->domains[i]); 303 tegra_powergate_remove(powergate); 304 } 305 } 306 307 static struct generic_pm_domain * 308 tegra_powergate_xlate(struct of_phandle_args *spec, void *data) 309 { 310 struct generic_pm_domain *domain = ERR_PTR(-ENOENT); 311 struct genpd_onecell_data *genpd = data; 312 unsigned int i; 313 314 for (i = 0; i < genpd->num_domains; i++) { 315 struct tegra_powergate *powergate; 316 317 powergate = to_tegra_powergate(genpd->domains[i]); 318 if (powergate->id == spec->args[0]) { 319 domain = &powergate->genpd; 320 break; 321 } 322 } 323 324 return domain; 325 } 326 327 int tegra_bpmp_init_powergates(struct tegra_bpmp *bpmp) 328 { 329 struct device_node *np = bpmp->dev->of_node; 330 struct tegra_powergate_info *powergates; 331 struct device *dev = bpmp->dev; 332 unsigned int count, i; 333 int err; 334 335 err = tegra_bpmp_probe_powergates(bpmp, &powergates); 336 if (err < 0) 337 return err; 338 339 count = err; 340 341 dev_dbg(dev, "%u power domains probed\n", count); 342 343 err = tegra_bpmp_add_powergates(bpmp, powergates, count); 344 if (err < 0) 345 goto free; 346 347 bpmp->genpd.xlate = tegra_powergate_xlate; 348 349 err = of_genpd_add_provider_onecell(np, &bpmp->genpd); 350 if (err < 0) { 351 dev_err(dev, "failed to add power domain provider: %d\n", err); 352 tegra_bpmp_remove_powergates(bpmp); 353 } 354 355 free: 356 for (i = 0; i < count; i++) 357 kfree(powergates[i].name); 358 359 kfree(powergates); 360 return err; 361 } 362