drivers/power/pmic/rk8xx.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2015 Google, Inc
   4  * Written by Simon Glass <sjg@chromium.org>
   5  */
   6
   7 #include <dm.h>
   8 #include <dm/lists.h>
   9 #include <bitfield.h>
  10 #include <errno.h>
  11 #include <log.h>
  12 #include <linux/bitfield.h>
  13 #include <power/rk8xx_pmic.h>
  14 #include <power/pmic.h>
  15 #include <spi.h>
  16 #include <sysreset.h>
  17
  18 static int rk8xx_sysreset_request(struct udevice *dev, enum sysreset_t type)
  19 {
  20         struct rk8xx_priv *priv = dev_get_priv(dev->parent);
  21
  22         if (type != SYSRESET_POWER_OFF)
  23                 return -EPROTONOSUPPORT;
  24
  25         switch (priv->variant) {
  26         case RK805_ID:
  27         case RK808_ID:
  28         case RK816_ID:
  29         case RK818_ID:
  30                 pmic_clrsetbits(dev->parent, REG_DEVCTRL, 0, BIT(0));
  31                 break;
  32         case RK809_ID:
  33         case RK817_ID:
  34                 pmic_clrsetbits(dev->parent, RK817_REG_SYS_CFG3, 0,
  35                                 BIT(0));
  36                 break;
  37         case RK806_ID:
  38                 pmic_clrsetbits(dev->parent, RK806_REG_SYS_CFG3, 0,
  39                                 BIT(0));
  40                 break;
  41         default:
  42                 printf("Unknown PMIC RK%x: Cannot shutdown\n",
  43                        priv->variant);
  44                 return -EPROTONOSUPPORT;
  45         };
  46
  47         return -EINPROGRESS;
  48 }
  49
  50 static struct sysreset_ops rk8xx_sysreset_ops = {
  51         .request        = rk8xx_sysreset_request,
  52 };
  53
  54 U_BOOT_DRIVER(rk8xx_sysreset) = {
  55         .name           = "rk8xx_sysreset",
  56         .id             = UCLASS_SYSRESET,
  57         .ops            = &rk8xx_sysreset_ops,
  58 };
  59
  60 /* In the event of a plug-in and the appropriate option has been
  61  * selected, we simply shutdown instead of continue the normal boot
  62  * process. Please note the rk808 is not supported as it doesn't
  63  * have the appropriate register.
  64  */
  65 void rk8xx_off_for_plugin(struct udevice *dev)
  66 {
  67         struct rk8xx_priv *priv = dev_get_priv(dev);
  68
  69         switch (priv->variant) {
  70         case RK805_ID:
  71         case RK816_ID:
  72         case RK818_ID:
  73                 if (pmic_reg_read(dev, RK8XX_ON_SOURCE) & RK8XX_ON_PLUG_IN) {
  74                         printf("Power Off due to plug-in event\n");
  75                         pmic_clrsetbits(dev, REG_DEVCTRL, 0, BIT(0));
  76                 }
  77                 break;
  78         case RK809_ID:
  79         case RK817_ID:
  80                 if (pmic_reg_read(dev, RK817_ON_SOURCE) & RK8XX_ON_PLUG_IN) {
  81                         printf("Power Off due to plug-in event\n");
  82                         pmic_clrsetbits(dev, RK817_REG_SYS_CFG3, 0,
  83                                         BIT(0));
  84                 }
  85                 break;
  86         default:
  87                 printf("PMIC RK%x: Cannot read boot reason.\n",
  88                        priv->variant);
  89         }
  90 }
  91
  92 static struct reg_data rk806_init_reg[] = {
  93         /* RST_FUN */
  94         { RK806_REG_SYS_CFG3, GENMASK(7, 6), BIT(7)},
  95 };
  96
  97 static struct reg_data rk817_init_reg[] = {
  98 /* enable the under-voltage protection,
  99  * the under-voltage protection will shutdown the LDO3 and reset the PMIC
 100  */
 101         { RK817_BUCK4_CMIN, 0x60, 0x60},
 102 };
 103
 104 static const struct pmic_child_info pmic_children_info[] = {
 105         { .prefix = "DCDC_REG", .driver = "rk8xx_buck"},
 106         { .prefix = "dcdc-reg", .driver = "rk8xx_buck"},
 107         { .prefix = "LDO_REG", .driver = "rk8xx_ldo"},
 108         { .prefix = "nldo-reg", .driver = "rk8xx_nldo"},
 109         { .prefix = "pldo-reg", .driver = "rk8xx_pldo"},
 110         { .prefix = "SWITCH_REG", .driver = "rk8xx_switch"},
 111         { },
 112 };
 113
 114 static int rk8xx_reg_count(struct udevice *dev)
 115 {
 116         return RK808_NUM_OF_REGS;
 117 }
 118
 119 #if CONFIG_IS_ENABLED(SPI) && CONFIG_IS_ENABLED(DM_SPI)
 120 struct rk806_cmd {
 121         uint8_t len: 4; /* Payload size in bytes - 1 */
 122         uint8_t reserved: 2;
 123         uint8_t crc_en: 1;
 124         uint8_t op: 1; /* READ=0; WRITE=1; */
 125         uint8_t reg_l;
 126 #define REG_L_MASK      GENMASK(7, 0)
 127         uint8_t reg_h;
 128 #define REG_H_MASK      GENMASK(15, 8)
 129 };
 130 #endif
 131
 132 static int rk8xx_write(struct udevice *dev, uint reg, const uint8_t *buff,
 133                           int len)
 134 {
 135         int ret;
 136
 137 #if CONFIG_IS_ENABLED(SPI) && CONFIG_IS_ENABLED(DM_SPI)
 138         if (device_get_uclass_id(dev->parent) == UCLASS_SPI) {
 139                 struct spi_slave *spi = dev_get_parent_priv(dev);
 140                 struct rk806_cmd cmd = {
 141                         .op = 1,
 142                         .len = len - 1,
 143                         .reg_l = FIELD_GET(REG_L_MASK, reg),
 144                         .reg_h = FIELD_GET(REG_H_MASK, reg),
 145                 };
 146
 147                 ret = dm_spi_claim_bus(dev);
 148                 if (ret) {
 149                         debug("Couldn't claim bus for device: %p!\n", dev);
 150                         return ret;
 151                 }
 152
 153                 ret = spi_write_then_read(spi, (u8 *)&cmd, sizeof(cmd), buff, NULL, len);
 154                 if (ret)
 155                         debug("write error to device: %p register: %#x!\n",
 156                               dev, reg);
 157
 158                 dm_spi_release_bus(dev);
 159
 160                 return ret;
 161         }
 162 #endif
 163
 164         ret = dm_i2c_write(dev, reg, buff, len);
 165         if (ret) {
 166                 debug("write error to device: %p register: %#x!\n", dev, reg);
 167                 return ret;
 168         }
 169
 170         return 0;
 171 }
 172
 173 static int rk8xx_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
 174 {
 175         int ret;
 176
 177 #if CONFIG_IS_ENABLED(SPI) && CONFIG_IS_ENABLED(DM_SPI)
 178         if (device_get_uclass_id(dev->parent) == UCLASS_SPI) {
 179                 struct spi_slave *spi = dev_get_parent_priv(dev);
 180                 struct rk806_cmd cmd = {
 181                         .op = 0,
 182                         .len = len - 1,
 183                         .reg_l = FIELD_GET(REG_L_MASK, reg),
 184                         .reg_h = FIELD_GET(REG_H_MASK, reg),
 185                 };
 186
 187                 ret = dm_spi_claim_bus(dev);
 188                 if (ret) {
 189                         debug("Couldn't claim bus for device: %p!\n", dev);
 190                         return ret;
 191                 }
 192
 193                 ret = spi_write_then_read(spi, (u8 *)&cmd, sizeof(cmd), NULL, buff, len);
 194                 if (ret)
 195                         debug("read error to device: %p register: %#x!\n",
 196                               dev, reg);
 197
 198                 dm_spi_release_bus(dev);
 199
 200                 return ret;
 201         }
 202 #endif
 203
 204         ret = dm_i2c_read(dev, reg, buff, len);
 205         if (ret) {
 206                 debug("read error from device: %p register: %#x!\n", dev, reg);
 207                 return ret;
 208         }
 209
 210         return 0;
 211 }
 212
 213 #if CONFIG_IS_ENABLED(PMIC_CHILDREN)
 214 static int rk8xx_bind(struct udevice *dev)
 215 {
 216         ofnode regulators_node;
 217         int children, ret;
 218
 219         regulators_node = dev_read_subnode(dev, "regulators");
 220         if (!ofnode_valid(regulators_node)) {
 221                 debug("%s: %s regulators subnode not found!\n", __func__,
 222                       dev->name);
 223                 return -ENXIO;
 224         }
 225
 226         debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
 227
 228         if (CONFIG_IS_ENABLED(SYSRESET)) {
 229                 ret = device_bind_driver_to_node(dev, "rk8xx_sysreset",
 230                                                  "rk8xx_sysreset",
 231                                                  dev_ofnode(dev), NULL);
 232                 if (ret)
 233                         return ret;
 234         }
 235
 236         children = pmic_bind_children(dev, regulators_node, pmic_children_info);
 237         if (!children)
 238                 debug("%s: %s - no child found\n", __func__, dev->name);
 239
 240         if (IS_ENABLED(CONFIG_SPL_BUILD) &&
 241             IS_ENABLED(CONFIG_ROCKCHIP_RK8XX_DISABLE_BOOT_ON_POWERON))
 242                 dev_or_flags(dev, DM_FLAG_PROBE_AFTER_BIND);
 243
 244         /* Always return success for this device */
 245         return 0;
 246 }
 247 #endif
 248
 249 static int rk8xx_probe(struct udevice *dev)
 250 {
 251         struct rk8xx_priv *priv = dev_get_priv(dev);
 252         struct reg_data *init_data = NULL;
 253         int init_data_num = 0;
 254         int ret = 0, i, show_variant;
 255         u8 msb, lsb, id_msb, id_lsb;
 256         u8 on_source = 0, off_source = 0;
 257         u8 power_en0, power_en1, power_en2, power_en3;
 258         u8 value;
 259
 260         /* read Chip variant */
 261         if (device_is_compatible(dev, "rockchip,rk817") ||
 262             device_is_compatible(dev, "rockchip,rk809")) {
 263                 id_msb = RK817_ID_MSB;
 264                 id_lsb = RK817_ID_LSB;
 265         } else if (device_is_compatible(dev, "rockchip,rk806")) {
 266                 id_msb = RK806_ID_MSB;
 267                 id_lsb = RK806_ID_LSB;
 268         } else {
 269                 id_msb = ID_MSB;
 270                 id_lsb = ID_LSB;
 271         }
 272
 273         ret = rk8xx_read(dev, id_msb, &msb, 1);
 274         if (ret)
 275                 return ret;
 276         ret = rk8xx_read(dev, id_lsb, &lsb, 1);
 277         if (ret)
 278                 return ret;
 279
 280         priv->variant = ((msb << 8) | lsb) & RK8XX_ID_MSK;
 281         show_variant = bitfield_extract_by_mask(priv->variant, RK8XX_ID_MSK);
 282         switch (priv->variant) {
 283         case RK808_ID:
 284                 /* RK808 ID is 0x0000, so fix show_variant for that PMIC */
 285                 show_variant = 0x808;
 286                 break;
 287         case RK805_ID:
 288         case RK816_ID:
 289         case RK818_ID:
 290                 on_source = RK8XX_ON_SOURCE;
 291                 off_source = RK8XX_OFF_SOURCE;
 292                 break;
 293         case RK809_ID:
 294         case RK817_ID:
 295                 on_source = RK817_ON_SOURCE;
 296                 off_source = RK817_OFF_SOURCE;
 297                 init_data = rk817_init_reg;
 298                 init_data_num = ARRAY_SIZE(rk817_init_reg);
 299                 power_en0 = pmic_reg_read(dev, RK817_POWER_EN0);
 300                 power_en1 = pmic_reg_read(dev, RK817_POWER_EN1);
 301                 power_en2 = pmic_reg_read(dev, RK817_POWER_EN2);
 302                 power_en3 = pmic_reg_read(dev, RK817_POWER_EN3);
 303
 304                 value = (power_en0 & 0x0f) | ((power_en1 & 0x0f) << 4);
 305                 pmic_reg_write(dev, RK817_POWER_EN_SAVE0, value);
 306                 value = (power_en2 & 0x0f) | ((power_en3 & 0x0f) << 4);
 307                 pmic_reg_write(dev, RK817_POWER_EN_SAVE1, value);
 308                 break;
 309         case RK806_ID:
 310                 on_source = RK806_ON_SOURCE;
 311                 off_source = RK806_OFF_SOURCE;
 312                 init_data = rk806_init_reg;
 313                 init_data_num = ARRAY_SIZE(rk806_init_reg);
 314                 break;
 315         default:
 316                 printf("Unknown PMIC: RK%x!!\n", show_variant);
 317                 return -EINVAL;
 318         }
 319
 320         for (i = 0; i < init_data_num; i++) {
 321                 ret = pmic_clrsetbits(dev,
 322                                       init_data[i].reg,
 323                                       init_data[i].mask,
 324                                       init_data[i].val);
 325                 if (ret < 0) {
 326                         printf("%s: i2c set reg 0x%x failed, ret=%d\n",
 327                                __func__, init_data[i].reg, ret);
 328                 }
 329
 330                 debug("%s: reg[0x%x] = 0x%x\n", __func__, init_data[i].reg,
 331                       pmic_reg_read(dev, init_data[i].reg));
 332         }
 333
 334         if (!IS_ENABLED(CONFIG_SPL_BUILD)) {
 335                 printf("PMIC:  RK%x ", show_variant);
 336                 if (on_source && off_source)
 337                         printf("(on=0x%02x, off=0x%02x)",
 338                                pmic_reg_read(dev, on_source),
 339                                pmic_reg_read(dev, off_source));
 340                 printf("\n");
 341         }
 342
 343         if (IS_ENABLED(CONFIG_ROCKCHIP_RK8XX_DISABLE_BOOT_ON_POWERON))
 344                 rk8xx_off_for_plugin(dev);
 345
 346         return 0;
 347 }
 348
 349 static struct dm_pmic_ops rk8xx_ops = {
 350         .reg_count = rk8xx_reg_count,
 351         .read = rk8xx_read,
 352         .write = rk8xx_write,
 353 };
 354
 355 static const struct udevice_id rk8xx_ids[] = {
 356         { .compatible = "rockchip,rk805" },
 357         { .compatible = "rockchip,rk806" },
 358         { .compatible = "rockchip,rk808" },
 359         { .compatible = "rockchip,rk809" },
 360         { .compatible = "rockchip,rk816" },
 361         { .compatible = "rockchip,rk817" },
 362         { .compatible = "rockchip,rk818" },
 363         { }
 364 };
 365
 366 U_BOOT_DRIVER(rockchip_rk805) = {
 367         .name = "rockchip_rk805",
 368         .id = UCLASS_PMIC,
 369         .of_match = rk8xx_ids,
 370 #if CONFIG_IS_ENABLED(PMIC_CHILDREN)
 371         .bind = rk8xx_bind,
 372 #endif
 373         .priv_auto        = sizeof(struct rk8xx_priv),
 374         .probe = rk8xx_probe,
 375         .ops = &rk8xx_ops,
 376 };
 377
 378 DM_DRIVER_ALIAS(rockchip_rk805, rockchip_rk808)