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