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 <log.h>
   9 #include <malloc.h>
  10 #include <power-domain-uclass.h>
  11 #include <asm/io.h>
  12 #include <asm/arch/power-domain.h>
  13 #include <dm/device-internal.h>
  14 #include <dm/device.h>
  15 #include <dm/uclass-internal.h>
  16 #include <asm/arch/sci/sci.h>
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 struct imx8_power_domain_priv {
  21         bool state_on;
  22 };
  23
  24 static bool check_device_power_off(struct udevice *dev,
  25                                    const char *permanent_on_devices[],
  26                                    int size)
  27 {
  28         int i;
  29
  30         for (i = 0; i < size; i++) {
  31                 if (!strcmp(dev->name, permanent_on_devices[i]))
  32                         return false;
  33         }
  34
  35         return true;
  36 }
  37
  38 void imx8_power_off_pd_devices(const char *permanent_on_devices[], int size)
  39 {
  40         struct udevice *dev;
  41         struct power_domain pd;
  42
  43         for (uclass_find_first_device(UCLASS_POWER_DOMAIN, &dev); dev;
  44              uclass_find_next_device(&dev)) {
  45                 if (!device_active(dev))
  46                         continue;
  47                 /*
  48                  * Power off active pd devices except the permanent
  49                  * power on devices
  50                  */
  51                 if (check_device_power_off(dev, permanent_on_devices, size)) {
  52                         pd.dev = dev;
  53                         power_domain_off(&pd);
  54                 }
  55         }
  56 }
  57
  58 int imx8_power_domain_lookup_name(const char *name,
  59                                   struct power_domain *power_domain)
  60 {
  61         struct udevice *dev;
  62         struct power_domain_ops *ops;
  63         int ret;
  64
  65         debug("%s(power_domain=%p name=%s)\n", __func__, power_domain, name);
  66
  67         ret = uclass_get_device_by_name(UCLASS_POWER_DOMAIN, name, &dev);
  68         if (ret) {
  69                 printf("%s fail: %s, ret = %d\n", __func__, name, ret);
  70                 return ret;
  71         }
  72
  73         ops = (struct power_domain_ops *)dev->driver->ops;
  74         power_domain->dev = dev;
  75         ret = ops->request(power_domain);
  76         if (ret) {
  77                 debug("ops->request() failed: %d\n", ret);
  78                 return ret;
  79         }
  80
  81         debug("%s ok: %s\n", __func__, dev->name);
  82
  83         return 0;
  84 }
  85
  86 static int imx8_power_domain_request(struct power_domain *power_domain)
  87 {
  88         debug("%s(power_domain=%p)\n", __func__, power_domain);
  89
  90         return 0;
  91 }
  92
  93 static int imx8_power_domain_free(struct power_domain *power_domain)
  94 {
  95         debug("%s(power_domain=%p)\n", __func__, power_domain);
  96
  97         return 0;
  98 }
  99
 100 static int imx8_power_domain_on(struct power_domain *power_domain)
 101 {
 102         struct udevice *dev = power_domain->dev;
 103         struct imx8_power_domain_platdata *pdata;
 104         struct imx8_power_domain_priv *ppriv;
 105         sc_err_t ret;
 106         int err;
 107
 108         struct power_domain parent_domain;
 109         struct udevice *parent = dev_get_parent(dev);
 110
 111         /* Need to power on parent node first */
 112         if (device_get_uclass_id(parent) == UCLASS_POWER_DOMAIN) {
 113                 parent_domain.dev = parent;
 114                 err = imx8_power_domain_on(&parent_domain);
 115                 if (err)
 116                         return err;
 117         }
 118
 119         pdata = (struct imx8_power_domain_platdata *)dev_get_platdata(dev);
 120         ppriv = (struct imx8_power_domain_priv *)dev_get_priv(dev);
 121
 122         debug("%s(power_domain=%s) resource_id %d\n", __func__, dev->name,
 123               pdata->resource_id);
 124
 125         /* Already powered on */
 126         if (ppriv->state_on)
 127                 return 0;
 128
 129         if (pdata->resource_id != SC_R_NONE) {
 130                 if (!sc_rm_is_resource_owned(-1, pdata->resource_id))
 131                         printf("%s [%d] not owned by curr partition\n", dev->name, pdata->resource_id);
 132
 133                 ret = sc_pm_set_resource_power_mode(-1, pdata->resource_id,
 134                                                     SC_PM_PW_MODE_ON);
 135                 if (ret) {
 136                         printf("Error: %s Power up failed! (error = %d)\n",
 137                                dev->name, ret);
 138                         return -EIO;
 139                 }
 140         }
 141
 142         ppriv->state_on = true;
 143         debug("%s is powered on\n", dev->name);
 144
 145         return 0;
 146 }
 147
 148 static int imx8_power_domain_off_node(struct power_domain *power_domain)
 149 {
 150         struct udevice *dev = power_domain->dev;
 151         struct udevice *child;
 152         struct imx8_power_domain_priv *ppriv;
 153         struct imx8_power_domain_priv *child_ppriv;
 154         struct imx8_power_domain_platdata *pdata;
 155         sc_err_t ret;
 156
 157         ppriv = dev_get_priv(dev);
 158         pdata = dev_get_platdata(dev);
 159
 160         debug("%s, %s, state_on %d\n", __func__, dev->name, ppriv->state_on);
 161
 162         /* Already powered off */
 163         if (!ppriv->state_on)
 164                 return 0;
 165
 166         /* Check if all subnodes are off */
 167         for (device_find_first_child(dev, &child);
 168                 child;
 169                 device_find_next_child(&child)) {
 170                 if (device_active(child)) {
 171                         child_ppriv =
 172                         (struct imx8_power_domain_priv *)dev_get_priv(child);
 173                         if (child_ppriv->state_on)
 174                                 return -EPERM;
 175                 }
 176         }
 177
 178         if (pdata->resource_id != SC_R_NONE) {
 179                 ret = sc_pm_set_resource_power_mode(-1, pdata->resource_id,
 180                                                     SC_PM_PW_MODE_OFF);
 181                 if (ret) {
 182                         if (!sc_rm_is_resource_owned(-1, pdata->resource_id)) {
 183                                 printf("%s not owned by curr partition %d\n", dev->name, pdata->resource_id);
 184                                 return 0;
 185                         }
 186                         printf("Error: %s Power off failed! (error = %d)\n",
 187                                dev->name, ret);
 188                         return -EIO;
 189                 }
 190         }
 191
 192         ppriv->state_on = false;
 193         debug("%s is powered off\n", dev->name);
 194
 195         return 0;
 196 }
 197
 198 static int imx8_power_domain_off_parentnodes(struct power_domain *power_domain)
 199 {
 200         struct udevice *dev = power_domain->dev;
 201         struct udevice *parent = dev_get_parent(dev);
 202         struct udevice *child;
 203         struct imx8_power_domain_priv *ppriv;
 204         struct imx8_power_domain_priv *child_ppriv;
 205         struct imx8_power_domain_platdata *pdata;
 206         sc_err_t ret;
 207         struct power_domain parent_pd;
 208
 209         if (device_get_uclass_id(parent) == UCLASS_POWER_DOMAIN) {
 210                 pdata =
 211                 (struct imx8_power_domain_platdata *)dev_get_platdata(parent);
 212                 ppriv = (struct imx8_power_domain_priv *)dev_get_priv(parent);
 213
 214                 debug("%s, %s, state_on %d\n", __func__, parent->name,
 215                       ppriv->state_on);
 216
 217                 /* Already powered off */
 218                 if (!ppriv->state_on)
 219                         return 0;
 220
 221                 /*
 222                  * Check if all sibling nodes are off. If yes,
 223                  * power off parent
 224                  */
 225                 for (device_find_first_child(parent, &child); child;
 226                      device_find_next_child(&child)) {
 227                         if (device_active(child)) {
 228                                 child_ppriv = (struct imx8_power_domain_priv *)
 229                                                 dev_get_priv(child);
 230                                 /* Find a power on sibling */
 231                                 if (child_ppriv->state_on) {
 232                                         debug("sibling %s, state_on %d\n",
 233                                               child->name,
 234                                               child_ppriv->state_on);
 235                                         return 0;
 236                                 }
 237                         }
 238                 }
 239
 240                 /* power off parent */
 241                 if (pdata->resource_id != SC_R_NONE) {
 242                         ret = sc_pm_set_resource_power_mode(-1,
 243                                                             pdata->resource_id,
 244                                                             SC_PM_PW_MODE_OFF);
 245                         if (ret) {
 246                                 printf("%s Power off failed! (error = %d)\n",
 247                                        parent->name, ret);
 248                                 return -EIO;
 249                         }
 250                 }
 251
 252                 ppriv->state_on = false;
 253                 debug("%s is powered off\n", parent->name);
 254
 255                 parent_pd.dev = parent;
 256                 imx8_power_domain_off_parentnodes(&parent_pd);
 257         }
 258
 259         return 0;
 260 }
 261
 262 static int imx8_power_domain_off(struct power_domain *power_domain)
 263 {
 264         int ret;
 265
 266         debug("%s(power_domain=%p)\n", __func__, power_domain);
 267
 268         /* Turn off the node */
 269         ret = imx8_power_domain_off_node(power_domain);
 270         if (ret) {
 271                 debug("Can't power off the node of dev %s, ret = %d\n",
 272                       power_domain->dev->name, ret);
 273                 return ret;
 274         }
 275
 276         /* Turn off parent nodes, if sibling nodes are all off */
 277         ret = imx8_power_domain_off_parentnodes(power_domain);
 278         if (ret) {
 279                 printf("Failed to power off parent nodes of dev %s, ret = %d\n",
 280                        power_domain->dev->name, ret);
 281                 return ret;
 282         }
 283
 284         return 0;
 285 }
 286
 287 static int imx8_power_domain_of_xlate(struct power_domain *power_domain,
 288                                       struct ofnode_phandle_args *args)
 289 {
 290         debug("%s(power_domain=%p)\n", __func__, power_domain);
 291
 292         /* Do nothing to the xlate, since we don't have args used */
 293
 294         return 0;
 295 }
 296
 297 static int imx8_power_domain_bind(struct udevice *dev)
 298 {
 299         int offset;
 300         const char *name;
 301         int ret = 0;
 302
 303         debug("%s(dev=%p)\n", __func__, dev);
 304
 305         offset = dev_of_offset(dev);
 306         for (offset = fdt_first_subnode(gd->fdt_blob, offset); offset > 0;
 307              offset = fdt_next_subnode(gd->fdt_blob, offset)) {
 308                 /* Bind the subnode to this driver */
 309                 name = fdt_get_name(gd->fdt_blob, offset, NULL);
 310
 311                 ret = device_bind_with_driver_data(dev, dev->driver, name,
 312                                                    dev->driver_data,
 313                                                    offset_to_ofnode(offset),
 314                                                    NULL);
 315
 316                 if (ret == -ENODEV)
 317                         printf("Driver '%s' refuses to bind\n",
 318                                dev->driver->name);
 319
 320                 if (ret)
 321                         printf("Error binding driver '%s': %d\n",
 322                                dev->driver->name, ret);
 323         }
 324
 325         return 0;
 326 }
 327
 328 static int imx8_power_domain_probe(struct udevice *dev)
 329 {
 330         struct imx8_power_domain_priv *ppriv;
 331
 332         debug("%s(dev=%s)\n", __func__, dev->name);
 333
 334         ppriv = (struct imx8_power_domain_priv *)dev_get_priv(dev);
 335
 336         /* Set default to power off */
 337         if (ppriv)
 338                 ppriv->state_on = false;
 339
 340         return 0;
 341 }
 342
 343 static int imx8_power_domain_ofdata_to_platdata(struct udevice *dev)
 344 {
 345         int reg;
 346         struct imx8_power_domain_platdata *pdata = dev_get_platdata(dev);
 347
 348         reg = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "reg", -1);
 349         if (reg == -1) {
 350                 debug("%s: Invalid resource id %d\n", __func__, reg);
 351                 return -EINVAL;
 352         }
 353         pdata->resource_id = (sc_rsrc_t)reg;
 354
 355         debug("%s resource_id %d\n", __func__, pdata->resource_id);
 356
 357         return 0;
 358 }
 359
 360 static const struct udevice_id imx8_power_domain_ids[] = {
 361         { .compatible = "nxp,imx8-pd" },
 362         { }
 363 };
 364
 365 struct power_domain_ops imx8_power_domain_ops = {
 366         .request = imx8_power_domain_request,
 367         .rfree = imx8_power_domain_free,
 368         .on = imx8_power_domain_on,
 369         .off = imx8_power_domain_off,
 370         .of_xlate = imx8_power_domain_of_xlate,
 371 };
 372
 373 U_BOOT_DRIVER(imx8_power_domain) = {
 374         .name = "imx8_power_domain",
 375         .id = UCLASS_POWER_DOMAIN,
 376         .of_match = imx8_power_domain_ids,
 377         .bind = imx8_power_domain_bind,
 378         .probe = imx8_power_domain_probe,
 379         .ofdata_to_platdata = imx8_power_domain_ofdata_to_platdata,
 380         .platdata_auto_alloc_size = sizeof(struct imx8_power_domain_platdata),
 381         .priv_auto_alloc_size = sizeof(struct imx8_power_domain_priv),
 382         .ops = &imx8_power_domain_ops,
 383         .flags  = DM_FLAG_DEFAULT_PD_CTRL_OFF,
 384 };