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