drivers/power/domain/imx8-power-domain-legacy.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright 2017 NXP
   4  */
   5
   6 #include <common.h>
   7 #include <dm.h>
   8 #include <malloc.h>
   9 #include <power-domain-uclass.h>
  10 #include <asm/io.h>
  11 #include <asm/arch/power-domain.h>
  12 #include <dm/device-internal.h>
  13 #include <dm/device.h>
  14 #include <dm/uclass-internal.h>
  15 #include <asm/arch/sci/sci.h>
  16
  17 DECLARE_GLOBAL_DATA_PTR;
  18
  19 struct imx8_power_domain_priv {
  20         bool state_on;
  21 };
  22
  23 static bool check_device_power_off(struct udevice *dev,
  24                                    const char *permanent_on_devices[],
  25                                    int size)
  26 {
  27         int i;
  28
  29         for (i = 0; i < size; i++) {
  30                 if (!strcmp(dev->name, permanent_on_devices[i]))
  31                         return false;
  32         }
  33
  34         return true;
  35 }
  36
  37 void imx8_power_off_pd_devices(const char *permanent_on_devices[], int size)
  38 {
  39         struct udevice *dev;
  40         struct power_domain pd;
  41
  42         for (uclass_find_first_device(UCLASS_POWER_DOMAIN, &dev); dev;
  43              uclass_find_next_device(&dev)) {
  44                 if (!device_active(dev))
  45                         continue;
  46                 /*
  47                  * Power off active pd devices except the permanent
  48                  * power on devices
  49                  */
  50                 if (check_device_power_off(dev, permanent_on_devices, size)) {
  51                         pd.dev = dev;
  52                         power_domain_off(&pd);
  53                 }
  54         }
  55 }
  56
  57 int imx8_power_domain_lookup_name(const char *name,
  58                                   struct power_domain *power_domain)
  59 {
  60         struct udevice *dev;
  61         struct power_domain_ops *ops;
  62         int ret;
  63
  64         debug("%s(power_domain=%p name=%s)\n", __func__, power_domain, name);
  65
  66         ret = uclass_get_device_by_name(UCLASS_POWER_DOMAIN, name, &dev);
  67         if (ret) {
  68                 printf("%s fail: %s, ret = %d\n", __func__, name, ret);
  69                 return ret;
  70         }
  71
  72         ops = (struct power_domain_ops *)dev->driver->ops;
  73         power_domain->dev = dev;
  74         ret = ops->request(power_domain);
  75         if (ret) {
  76                 debug("ops->request() failed: %d\n", ret);
  77                 return ret;
  78         }
  79
  80         debug("%s ok: %s\n", __func__, dev->name);
  81
  82         return 0;
  83 }
  84
  85 static int imx8_power_domain_request(struct power_domain *power_domain)
  86 {
  87         debug("%s(power_domain=%p)\n", __func__, power_domain);
  88
  89         return 0;
  90 }
  91
  92 static int imx8_power_domain_free(struct power_domain *power_domain)
  93 {
  94         debug("%s(power_domain=%p)\n", __func__, power_domain);
  95
  96         return 0;
  97 }
  98
  99 static int imx8_power_domain_on(struct power_domain *power_domain)
 100 {
 101         struct udevice *dev = power_domain->dev;
 102         struct imx8_power_domain_platdata *pdata;
 103         struct imx8_power_domain_priv *ppriv;
 104         sc_err_t ret;
 105         int err;
 106
 107         struct power_domain parent_domain;
 108         struct udevice *parent = dev_get_parent(dev);
 109
 110         /* Need to power on parent node first */
 111         if (device_get_uclass_id(parent) == UCLASS_POWER_DOMAIN) {
 112                 parent_domain.dev = parent;
 113                 err = imx8_power_domain_on(&parent_domain);
 114                 if (err)
 115                         return err;
 116         }
 117
 118         pdata = (struct imx8_power_domain_platdata *)dev_get_platdata(dev);
 119         ppriv = (struct imx8_power_domain_priv *)dev_get_priv(dev);
 120
 121         debug("%s(power_domain=%s) resource_id %d\n", __func__, dev->name,
 122               pdata->resource_id);
 123
 124         /* Already powered on */
 125         if (ppriv->state_on)
 126                 return 0;
 127
 128         if (pdata->resource_id != SC_R_NONE) {
 129                 if (!sc_rm_is_resource_owned(-1, pdata->resource_id))
 130                         printf("%s [%d] not owned by curr partition\n", dev->name, pdata->resource_id);
 131
 132                 ret = sc_pm_set_resource_power_mode(-1, pdata->resource_id,
 133                                                     SC_PM_PW_MODE_ON);
 134                 if (ret) {
 135                         printf("Error: %s Power up failed! (error = %d)\n",
 136                                dev->name, ret);
 137                         return -EIO;
 138                 }
 139         }
 140
 141         ppriv->state_on = true;
 142         debug("%s is powered on\n", dev->name);
 143
 144         return 0;
 145 }
 146
 147 static int imx8_power_domain_off_node(struct power_domain *power_domain)
 148 {
 149         struct udevice *dev = power_domain->dev;
 150         struct udevice *child;
 151         struct imx8_power_domain_priv *ppriv;
 152         struct imx8_power_domain_priv *child_ppriv;
 153         struct imx8_power_domain_platdata *pdata;
 154         sc_err_t ret;
 155
 156         ppriv = dev_get_priv(dev);
 157         pdata = dev_get_platdata(dev);
 158
 159         debug("%s, %s, state_on %d\n", __func__, dev->name, ppriv->state_on);
 160
 161         /* Already powered off */
 162         if (!ppriv->state_on)
 163                 return 0;
 164
 165         /* Check if all subnodes are off */
 166         for (device_find_first_child(dev, &child);
 167                 child;
 168                 device_find_next_child(&child)) {
 169                 if (device_active(child)) {
 170                         child_ppriv =
 171                         (struct imx8_power_domain_priv *)dev_get_priv(child);
 172                         if (child_ppriv->state_on)
 173                                 return -EPERM;
 174                 }
 175         }
 176
 177         if (pdata->resource_id != SC_R_NONE) {
 178                 ret = sc_pm_set_resource_power_mode(-1, pdata->resource_id,
 179                                                     SC_PM_PW_MODE_OFF);
 180                 if (ret) {
 181                         if (!sc_rm_is_resource_owned(-1, pdata->resource_id)) {
 182                                 printf("%s not owned by curr partition %d\n", dev->name, pdata->resource_id);
 183                                 return 0;
 184                         }
 185                         printf("Error: %s Power off failed! (error = %d)\n",
 186                                dev->name, ret);
 187                         return -EIO;
 188                 }
 189         }
 190
 191         ppriv->state_on = false;
 192         debug("%s is powered off\n", dev->name);
 193
 194         return 0;
 195 }
 196
 197 static int imx8_power_domain_off_parentnodes(struct power_domain *power_domain)
 198 {
 199         struct udevice *dev = power_domain->dev;
 200         struct udevice *parent = dev_get_parent(dev);
 201         struct udevice *child;
 202         struct imx8_power_domain_priv *ppriv;
 203         struct imx8_power_domain_priv *child_ppriv;
 204         struct imx8_power_domain_platdata *pdata;
 205         sc_err_t ret;
 206         struct power_domain parent_pd;
 207
 208         if (device_get_uclass_id(parent) == UCLASS_POWER_DOMAIN) {
 209                 pdata =
 210                 (struct imx8_power_domain_platdata *)dev_get_platdata(parent);
 211                 ppriv = (struct imx8_power_domain_priv *)dev_get_priv(parent);
 212
 213                 debug("%s, %s, state_on %d\n", __func__, parent->name,
 214                       ppriv->state_on);
 215
 216                 /* Already powered off */
 217                 if (!ppriv->state_on)
 218                         return 0;
 219
 220                 /*
 221                  * Check if all sibling nodes are off. If yes,
 222                  * power off parent
 223                  */
 224                 for (device_find_first_child(parent, &child); child;
 225                      device_find_next_child(&child)) {
 226                         if (device_active(child)) {
 227                                 child_ppriv = (struct imx8_power_domain_priv *)
 228                                                 dev_get_priv(child);
 229                                 /* Find a power on sibling */
 230                                 if (child_ppriv->state_on) {
 231                                         debug("sibling %s, state_on %d\n",
 232                                               child->name,
 233                                               child_ppriv->state_on);
 234                                         return 0;
 235                                 }
 236                         }
 237                 }
 238
 239                 /* power off parent */
 240                 if (pdata->resource_id != SC_R_NONE) {
 241                         ret = sc_pm_set_resource_power_mode(-1,
 242                                                             pdata->resource_id,
 243                                                             SC_PM_PW_MODE_OFF);
 244                         if (ret) {
 245                                 printf("%s Power off failed! (error = %d)\n",
 246                                        parent->name, ret);
 247                                 return -EIO;
 248                         }
 249                 }
 250
 251                 ppriv->state_on = false;
 252                 debug("%s is powered off\n", parent->name);
 253
 254                 parent_pd.dev = parent;
 255                 imx8_power_domain_off_parentnodes(&parent_pd);
 256         }
 257
 258         return 0;
 259 }
 260
 261 static int imx8_power_domain_off(struct power_domain *power_domain)
 262 {
 263         int ret;
 264
 265         debug("%s(power_domain=%p)\n", __func__, power_domain);
 266
 267         /* Turn off the node */
 268         ret = imx8_power_domain_off_node(power_domain);
 269         if (ret) {
 270                 debug("Can't power off the node of dev %s, ret = %d\n",
 271                       power_domain->dev->name, ret);
 272                 return ret;
 273         }
 274
 275         /* Turn off parent nodes, if sibling nodes are all off */
 276         ret = imx8_power_domain_off_parentnodes(power_domain);
 277         if (ret) {
 278                 printf("Failed to power off parent nodes of dev %s, ret = %d\n",
 279                        power_domain->dev->name, ret);
 280                 return ret;
 281         }
 282
 283         return 0;
 284 }
 285
 286 static int imx8_power_domain_of_xlate(struct power_domain *power_domain,
 287                                       struct ofnode_phandle_args *args)
 288 {
 289         debug("%s(power_domain=%p)\n", __func__, power_domain);
 290
 291         /* Do nothing to the xlate, since we don't have args used */
 292
 293         return 0;
 294 }
 295
 296 static int imx8_power_domain_bind(struct udevice *dev)
 297 {
 298         int offset;
 299         const char *name;
 300         int ret = 0;
 301
 302         debug("%s(dev=%p)\n", __func__, dev);
 303
 304         offset = dev_of_offset(dev);
 305         for (offset = fdt_first_subnode(gd->fdt_blob, offset); offset > 0;
 306              offset = fdt_next_subnode(gd->fdt_blob, offset)) {
 307                 /* Bind the subnode to this driver */
 308                 name = fdt_get_name(gd->fdt_blob, offset, NULL);
 309
 310                 ret = device_bind_with_driver_data(dev, dev->driver, name,
 311                                                    dev->driver_data,
 312                                                    offset_to_ofnode(offset),
 313                                                    NULL);
 314
 315                 if (ret == -ENODEV)
 316                         printf("Driver '%s' refuses to bind\n",
 317                                dev->driver->name);
 318
 319                 if (ret)
 320                         printf("Error binding driver '%s': %d\n",
 321                                dev->driver->name, ret);
 322         }
 323
 324         return 0;
 325 }
 326
 327 static int imx8_power_domain_probe(struct udevice *dev)
 328 {
 329         struct imx8_power_domain_priv *ppriv;
 330
 331         debug("%s(dev=%s)\n", __func__, dev->name);
 332
 333         ppriv = (struct imx8_power_domain_priv *)dev_get_priv(dev);
 334
 335         /* Set default to power off */
 336         if (ppriv)
 337                 ppriv->state_on = false;
 338
 339         return 0;
 340 }
 341
 342 static int imx8_power_domain_ofdata_to_platdata(struct udevice *dev)
 343 {
 344         int reg;
 345         struct imx8_power_domain_platdata *pdata = dev_get_platdata(dev);
 346
 347         reg = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "reg", -1);
 348         if (reg == -1) {
 349                 debug("%s: Invalid resource id %d\n", __func__, reg);
 350                 return -EINVAL;
 351         }
 352         pdata->resource_id = (sc_rsrc_t)reg;
 353
 354         debug("%s resource_id %d\n", __func__, pdata->resource_id);
 355
 356         return 0;
 357 }
 358
 359 static const struct udevice_id imx8_power_domain_ids[] = {
 360         { .compatible = "nxp,imx8-pd" },
 361         { }
 362 };
 363
 364 struct power_domain_ops imx8_power_domain_ops = {
 365         .request = imx8_power_domain_request,
 366         .rfree = imx8_power_domain_free,
 367         .on = imx8_power_domain_on,
 368         .off = imx8_power_domain_off,
 369         .of_xlate = imx8_power_domain_of_xlate,
 370 };
 371
 372 U_BOOT_DRIVER(imx8_power_domain) = {
 373         .name = "imx8_power_domain",
 374         .id = UCLASS_POWER_DOMAIN,
 375         .of_match = imx8_power_domain_ids,
 376         .bind = imx8_power_domain_bind,
 377         .probe = imx8_power_domain_probe,
 378         .ofdata_to_platdata = imx8_power_domain_ofdata_to_platdata,
 379         .platdata_auto_alloc_size = sizeof(struct imx8_power_domain_platdata),
 380         .priv_auto_alloc_size = sizeof(struct imx8_power_domain_priv),
 381         .ops = &imx8_power_domain_ops,
 382         .flags  = DM_FLAG_DEFAULT_PD_CTRL_OFF,
 383 };