drivers/soc/bcm/bcm63xx/bcm63xx-power.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * BCM63xx Power Domain Controller Driver
   4  *
   5  * Copyright (C) 2020 Álvaro Fernández Rojas <noltari@gmail.com>
   6  */
   7
   8 #include <dt-bindings/soc/bcm6318-pm.h>
   9 #include <dt-bindings/soc/bcm6328-pm.h>
  10 #include <dt-bindings/soc/bcm6362-pm.h>
  11 #include <dt-bindings/soc/bcm63268-pm.h>
  12 #include <linux/io.h>
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/pm_domain.h>
  16 #include <linux/of.h>
  17 #include <linux/of_device.h>
  18
  19 struct bcm63xx_power_dev {
  20         struct generic_pm_domain genpd;
  21         struct bcm63xx_power *power;
  22         uint32_t mask;
  23 };
  24
  25 struct bcm63xx_power {
  26         void __iomem *base;
  27         spinlock_t lock;
  28         struct bcm63xx_power_dev *dev;
  29         struct genpd_onecell_data genpd_data;
  30         struct generic_pm_domain **genpd;
  31 };
  32
  33 struct bcm63xx_power_data {
  34         const char * const name;
  35         uint8_t bit;
  36         unsigned int flags;
  37 };
  38
  39 static int bcm63xx_power_get_state(struct bcm63xx_power_dev *pmd, bool *is_on)
  40 {
  41         struct bcm63xx_power *power = pmd->power;
  42
  43         if (!pmd->mask) {
  44                 *is_on = false;
  45                 return -EINVAL;
  46         }
  47
  48         *is_on = !(__raw_readl(power->base) & pmd->mask);
  49
  50         return 0;
  51 }
  52
  53 static int bcm63xx_power_set_state(struct bcm63xx_power_dev *pmd, bool on)
  54 {
  55         struct bcm63xx_power *power = pmd->power;
  56         unsigned long flags;
  57         uint32_t val;
  58
  59         if (!pmd->mask)
  60                 return -EINVAL;
  61
  62         spin_lock_irqsave(&power->lock, flags);
  63         val = __raw_readl(power->base);
  64         if (on)
  65                 val &= ~pmd->mask;
  66         else
  67                 val |= pmd->mask;
  68         __raw_writel(val, power->base);
  69         spin_unlock_irqrestore(&power->lock, flags);
  70
  71         return 0;
  72 }
  73
  74 static int bcm63xx_power_on(struct generic_pm_domain *genpd)
  75 {
  76         struct bcm63xx_power_dev *pmd = container_of(genpd,
  77                 struct bcm63xx_power_dev, genpd);
  78
  79         return bcm63xx_power_set_state(pmd, true);
  80 }
  81
  82 static int bcm63xx_power_off(struct generic_pm_domain *genpd)
  83 {
  84         struct bcm63xx_power_dev *pmd = container_of(genpd,
  85                 struct bcm63xx_power_dev, genpd);
  86
  87         return bcm63xx_power_set_state(pmd, false);
  88 }
  89
  90 static int bcm63xx_power_probe(struct platform_device *pdev)
  91 {
  92         struct device *dev = &pdev->dev;
  93         struct device_node *np = dev->of_node;
  94         struct resource *res;
  95         const struct bcm63xx_power_data *entry, *table;
  96         struct bcm63xx_power *power;
  97         unsigned int ndom;
  98         uint8_t max_bit = 0;
  99         int ret;
 100
 101         power = devm_kzalloc(dev, sizeof(*power), GFP_KERNEL);
 102         if (!power)
 103                 return -ENOMEM;
 104
 105         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 106         power->base = devm_ioremap_resource(&pdev->dev, res);
 107         if (IS_ERR(power->base))
 108                 return PTR_ERR(power->base);
 109
 110         table = of_device_get_match_data(dev);
 111         if (!table)
 112                 return -EINVAL;
 113
 114         power->genpd_data.num_domains = 0;
 115         ndom = 0;
 116         for (entry = table; entry->name; entry++) {
 117                 max_bit = max(max_bit, entry->bit);
 118                 ndom++;
 119         }
 120
 121         if (!ndom)
 122                 return -ENODEV;
 123
 124         power->genpd_data.num_domains = max_bit + 1;
 125
 126         power->dev = devm_kcalloc(dev, power->genpd_data.num_domains,
 127                                   sizeof(struct bcm63xx_power_dev),
 128                                   GFP_KERNEL);
 129         if (!power->dev)
 130                 return -ENOMEM;
 131
 132         power->genpd = devm_kcalloc(dev, power->genpd_data.num_domains,
 133                                     sizeof(struct generic_pm_domain *),
 134                                     GFP_KERNEL);
 135         if (!power->genpd)
 136                 return -ENOMEM;
 137
 138         power->genpd_data.domains = power->genpd;
 139
 140         ndom = 0;
 141         for (entry = table; entry->name; entry++) {
 142                 struct bcm63xx_power_dev *pmd = &power->dev[ndom];
 143                 bool is_on;
 144
 145                 pmd->power = power;
 146                 pmd->mask = BIT(entry->bit);
 147                 pmd->genpd.name = entry->name;
 148                 pmd->genpd.flags = entry->flags;
 149
 150                 ret = bcm63xx_power_get_state(pmd, &is_on);
 151                 if (ret)
 152                         dev_warn(dev, "unable to get current state for %s\n",
 153                                  pmd->genpd.name);
 154
 155                 pmd->genpd.power_on = bcm63xx_power_on;
 156                 pmd->genpd.power_off = bcm63xx_power_off;
 157
 158                 pm_genpd_init(&pmd->genpd, NULL, !is_on);
 159                 power->genpd[entry->bit] = &pmd->genpd;
 160
 161                 ndom++;
 162         }
 163
 164         spin_lock_init(&power->lock);
 165
 166         ret = of_genpd_add_provider_onecell(np, &power->genpd_data);
 167         if (ret) {
 168                 dev_err(dev, "failed to register genpd driver: %d\n", ret);
 169                 return ret;
 170         }
 171
 172         dev_info(dev, "registered %u power domains\n", ndom);
 173
 174         return 0;
 175 }
 176
 177 static const struct bcm63xx_power_data bcm6318_power_domains[] = {
 178         {
 179                 .name = "pcie",
 180                 .bit = BCM6318_POWER_DOMAIN_PCIE,
 181         }, {
 182                 .name = "usb",
 183                 .bit = BCM6318_POWER_DOMAIN_USB,
 184         }, {
 185                 .name = "ephy0",
 186                 .bit = BCM6318_POWER_DOMAIN_EPHY0,
 187         }, {
 188                 .name = "ephy1",
 189                 .bit = BCM6318_POWER_DOMAIN_EPHY1,
 190         }, {
 191                 .name = "ephy2",
 192                 .bit = BCM6318_POWER_DOMAIN_EPHY2,
 193         }, {
 194                 .name = "ephy3",
 195                 .bit = BCM6318_POWER_DOMAIN_EPHY3,
 196         }, {
 197                 .name = "ldo2p5",
 198                 .bit = BCM6318_POWER_DOMAIN_LDO2P5,
 199                 .flags = GENPD_FLAG_ALWAYS_ON,
 200         }, {
 201                 .name = "ldo2p9",
 202                 .bit = BCM6318_POWER_DOMAIN_LDO2P9,
 203                 .flags = GENPD_FLAG_ALWAYS_ON,
 204         }, {
 205                 .name = "sw1p0",
 206                 .bit = BCM6318_POWER_DOMAIN_SW1P0,
 207                 .flags = GENPD_FLAG_ALWAYS_ON,
 208         }, {
 209                 .name = "pad",
 210                 .bit = BCM6318_POWER_DOMAIN_PAD,
 211                 .flags = GENPD_FLAG_ALWAYS_ON,
 212         }, {
 213                 /* sentinel */
 214         },
 215 };
 216
 217 static const struct bcm63xx_power_data bcm6328_power_domains[] = {
 218         {
 219                 .name = "adsl2-mips",
 220                 .bit = BCM6328_POWER_DOMAIN_ADSL2_MIPS,
 221         }, {
 222                 .name = "adsl2-phy",
 223                 .bit = BCM6328_POWER_DOMAIN_ADSL2_PHY,
 224         }, {
 225                 .name = "adsl2-afe",
 226                 .bit = BCM6328_POWER_DOMAIN_ADSL2_AFE,
 227         }, {
 228                 .name = "sar",
 229                 .bit = BCM6328_POWER_DOMAIN_SAR,
 230         }, {
 231                 .name = "pcm",
 232                 .bit = BCM6328_POWER_DOMAIN_PCM,
 233         }, {
 234                 .name = "usbd",
 235                 .bit = BCM6328_POWER_DOMAIN_USBD,
 236         }, {
 237                 .name = "usbh",
 238                 .bit = BCM6328_POWER_DOMAIN_USBH,
 239         }, {
 240                 .name = "pcie",
 241                 .bit = BCM6328_POWER_DOMAIN_PCIE,
 242         }, {
 243                 .name = "robosw",
 244                 .bit = BCM6328_POWER_DOMAIN_ROBOSW,
 245         }, {
 246                 .name = "ephy",
 247                 .bit = BCM6328_POWER_DOMAIN_EPHY,
 248         }, {
 249                 /* sentinel */
 250         },
 251 };
 252
 253 static const struct bcm63xx_power_data bcm6362_power_domains[] = {
 254         {
 255                 .name = "sar",
 256                 .bit = BCM6362_POWER_DOMAIN_SAR,
 257         }, {
 258                 .name = "ipsec",
 259                 .bit = BCM6362_POWER_DOMAIN_IPSEC,
 260         }, {
 261                 .name = "mips",
 262                 .bit = BCM6362_POWER_DOMAIN_MIPS,
 263                 .flags = GENPD_FLAG_ALWAYS_ON,
 264         }, {
 265                 .name = "dect",
 266                 .bit = BCM6362_POWER_DOMAIN_DECT,
 267         }, {
 268                 .name = "usbh",
 269                 .bit = BCM6362_POWER_DOMAIN_USBH,
 270         }, {
 271                 .name = "usbd",
 272                 .bit = BCM6362_POWER_DOMAIN_USBD,
 273         }, {
 274                 .name = "robosw",
 275                 .bit = BCM6362_POWER_DOMAIN_ROBOSW,
 276         }, {
 277                 .name = "pcm",
 278                 .bit = BCM6362_POWER_DOMAIN_PCM,
 279         }, {
 280                 .name = "periph",
 281                 .bit = BCM6362_POWER_DOMAIN_PERIPH,
 282                 .flags = GENPD_FLAG_ALWAYS_ON,
 283         }, {
 284                 .name = "adsl-phy",
 285                 .bit = BCM6362_POWER_DOMAIN_ADSL_PHY,
 286         }, {
 287                 .name = "gmii-pads",
 288                 .bit = BCM6362_POWER_DOMAIN_GMII_PADS,
 289         }, {
 290                 .name = "fap",
 291                 .bit = BCM6362_POWER_DOMAIN_FAP,
 292         }, {
 293                 .name = "pcie",
 294                 .bit = BCM6362_POWER_DOMAIN_PCIE,
 295         }, {
 296                 .name = "wlan-pads",
 297                 .bit = BCM6362_POWER_DOMAIN_WLAN_PADS,
 298         }, {
 299                 /* sentinel */
 300         },
 301 };
 302
 303 static const struct bcm63xx_power_data bcm63268_power_domains[] = {
 304         {
 305                 .name = "sar",
 306                 .bit = BCM63268_POWER_DOMAIN_SAR,
 307         }, {
 308                 .name = "ipsec",
 309                 .bit = BCM63268_POWER_DOMAIN_IPSEC,
 310         }, {
 311                 .name = "mips",
 312                 .bit = BCM63268_POWER_DOMAIN_MIPS,
 313                 .flags = GENPD_FLAG_ALWAYS_ON,
 314         }, {
 315                 .name = "dect",
 316                 .bit = BCM63268_POWER_DOMAIN_DECT,
 317         }, {
 318                 .name = "usbh",
 319                 .bit = BCM63268_POWER_DOMAIN_USBH,
 320         }, {
 321                 .name = "usbd",
 322                 .bit = BCM63268_POWER_DOMAIN_USBD,
 323         }, {
 324                 .name = "robosw",
 325                 .bit = BCM63268_POWER_DOMAIN_ROBOSW,
 326         }, {
 327                 .name = "pcm",
 328                 .bit = BCM63268_POWER_DOMAIN_PCM,
 329         }, {
 330                 .name = "periph",
 331                 .bit = BCM63268_POWER_DOMAIN_PERIPH,
 332                 .flags = GENPD_FLAG_ALWAYS_ON,
 333         }, {
 334                 .name = "vdsl-phy",
 335                 .bit = BCM63268_POWER_DOMAIN_VDSL_PHY,
 336         }, {
 337                 .name = "vdsl-mips",
 338                 .bit = BCM63268_POWER_DOMAIN_VDSL_MIPS,
 339         }, {
 340                 .name = "fap",
 341                 .bit = BCM63268_POWER_DOMAIN_FAP,
 342         }, {
 343                 .name = "pcie",
 344                 .bit = BCM63268_POWER_DOMAIN_PCIE,
 345         }, {
 346                 .name = "wlan-pads",
 347                 .bit = BCM63268_POWER_DOMAIN_WLAN_PADS,
 348         }, {
 349                 /* sentinel */
 350         },
 351 };
 352
 353 static const struct of_device_id bcm63xx_power_of_match[] = {
 354         {
 355                 .compatible = "brcm,bcm6318-power-controller",
 356                 .data = &bcm6318_power_domains,
 357         }, {
 358                 .compatible = "brcm,bcm6328-power-controller",
 359                 .data = &bcm6328_power_domains,
 360         }, {
 361                 .compatible = "brcm,bcm6362-power-controller",
 362                 .data = &bcm6362_power_domains,
 363         }, {
 364                 .compatible = "brcm,bcm63268-power-controller",
 365                 .data = &bcm63268_power_domains,
 366         }, {
 367                 /* sentinel */
 368         }
 369 };
 370
 371 static struct platform_driver bcm63xx_power_driver = {
 372         .driver = {
 373                 .name = "bcm63xx-power-controller",
 374                 .of_match_table = bcm63xx_power_of_match,
 375         },
 376         .probe  = bcm63xx_power_probe,
 377 };
 378 builtin_platform_driver(bcm63xx_power_driver);