drivers/power/regulator/sandbox.c

   1 /*
   2  *  Copyright (C) 2015 Samsung Electronics
   3  *  Przemyslaw Marczak  <p.marczak@samsung.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <fdtdec.h>
  10 #include <errno.h>
  11 #include <dm.h>
  12 #include <i2c.h>
  13 #include <power/pmic.h>
  14 #include <power/regulator.h>
  15 #include <power/sandbox_pmic.h>
  16
  17 DECLARE_GLOBAL_DATA_PTR;
  18
  19 #define MODE(_id, _val, _name) [_id] = {  \
  20         .id = _id,                \
  21         .register_value = _val,   \
  22         .name = _name,            \
  23 }
  24
  25 #define RANGE(_min, _max, _step) { \
  26         .min = _min,               \
  27         .max = _max,               \
  28         .step = _step,             \
  29 }
  30
  31 /*
  32  * struct output_range - helper structure type to define the range of output
  33  * operating values (current/voltage), limited by the PMIC IC design.
  34  *
  35  * @min  - minimum value
  36  * @max  - maximum value
  37  * @step - step value
  38 */
  39 struct output_range {
  40         int min;
  41         int max;
  42         int step;
  43 };
  44
  45 /* BUCK: 1,2 - voltage range */
  46 static struct output_range buck_voltage_range[] = {
  47         RANGE(OUT_BUCK1_UV_MIN, OUT_BUCK1_UV_MAX, OUT_BUCK1_UV_STEP),
  48         RANGE(OUT_BUCK2_UV_MIN, OUT_BUCK2_UV_MAX, OUT_BUCK2_UV_STEP),
  49 };
  50
  51 /* BUCK: 1 - current range */
  52 static struct output_range buck_current_range[] = {
  53         RANGE(OUT_BUCK1_UA_MIN, OUT_BUCK1_UA_MAX, OUT_BUCK1_UA_STEP),
  54 };
  55
  56 /* BUCK operating modes */
  57 static struct dm_regulator_mode sandbox_buck_modes[] = {
  58         MODE(BUCK_OM_OFF, OM2REG(BUCK_OM_OFF), "OFF"),
  59         MODE(BUCK_OM_ON, OM2REG(BUCK_OM_ON), "ON"),
  60         MODE(BUCK_OM_PWM, OM2REG(BUCK_OM_PWM), "PWM"),
  61 };
  62
  63 /* LDO: 1,2 - voltage range */
  64 static struct output_range ldo_voltage_range[] = {
  65         RANGE(OUT_LDO1_UV_MIN, OUT_LDO1_UV_MAX, OUT_LDO1_UV_STEP),
  66         RANGE(OUT_LDO2_UV_MIN, OUT_LDO2_UV_MAX, OUT_LDO2_UV_STEP),
  67 };
  68
  69 /* LDO: 1 - current range */
  70 static struct output_range ldo_current_range[] = {
  71         RANGE(OUT_LDO1_UA_MIN, OUT_LDO1_UA_MAX, OUT_LDO1_UA_STEP),
  72 };
  73
  74 /* LDO operating modes */
  75 static struct dm_regulator_mode sandbox_ldo_modes[] = {
  76         MODE(LDO_OM_OFF, OM2REG(LDO_OM_OFF), "OFF"),
  77         MODE(LDO_OM_ON, OM2REG(LDO_OM_ON), "ON"),
  78         MODE(LDO_OM_SLEEP, OM2REG(LDO_OM_SLEEP), "SLEEP"),
  79         MODE(LDO_OM_STANDBY, OM2REG(LDO_OM_STANDBY), "STANDBY"),
  80 };
  81
  82 int out_get_value(struct udevice *dev, int output_count, int reg_type,
  83                   struct output_range *range)
  84 {
  85         uint8_t reg_val;
  86         uint reg;
  87         int ret;
  88
  89         if (dev->driver_data > output_count) {
  90                 pr_err("Unknown regulator number: %lu for PMIC %s!",
  91                       dev->driver_data, dev->name);
  92                 return -EINVAL;
  93         }
  94
  95         reg = (dev->driver_data - 1) * OUT_REG_COUNT + reg_type;
  96         ret = pmic_read(dev->parent, reg, &reg_val, 1);
  97         if (ret) {
  98                 pr_err("PMIC read failed: %d\n",  ret);
  99                 return ret;
 100         }
 101
 102         ret =  REG2VAL(range[dev->driver_data - 1].min,
 103                        range[dev->driver_data - 1].step,
 104                        reg_val);
 105
 106         return ret;
 107 }
 108
 109 static int out_set_value(struct udevice *dev, int output_count, int reg_type,
 110                          struct output_range *range, int value)
 111 {
 112         uint8_t reg_val;
 113         uint reg;
 114         int ret;
 115         int max_value;
 116
 117         if (dev->driver_data > output_count) {
 118                 pr_err("Unknown regulator number: %lu for PMIC %s!",
 119                       dev->driver_data, dev->name);
 120                 return -EINVAL;
 121         }
 122
 123         max_value = range[dev->driver_data - 1].max;
 124         if (value > max_value) {
 125                 pr_err("Wrong value for %s: %lu. Max is: %d.",
 126                       dev->name, dev->driver_data, max_value);
 127                 return -EINVAL;
 128         }
 129
 130         reg_val = VAL2REG(range[dev->driver_data - 1].min,
 131                           range[dev->driver_data - 1].step,
 132                           value);
 133
 134         reg = (dev->driver_data - 1) * OUT_REG_COUNT + reg_type;
 135         ret = pmic_write(dev->parent, reg, &reg_val, 1);
 136         if (ret) {
 137                 pr_err("PMIC write failed: %d\n",  ret);
 138                 return ret;
 139         }
 140
 141         return 0;
 142 }
 143
 144 static int out_get_mode(struct udevice *dev)
 145 {
 146         struct dm_regulator_uclass_platdata *uc_pdata;
 147         uint8_t reg_val;
 148         uint reg;
 149         int ret;
 150         int i;
 151
 152         uc_pdata = dev_get_uclass_platdata(dev);
 153
 154         reg = (dev->driver_data - 1) * OUT_REG_COUNT + OUT_REG_OM;
 155         ret = pmic_read(dev->parent, reg, &reg_val, 1);
 156         if (ret) {
 157                 pr_err("PMIC read failed: %d\n",  ret);
 158                 return ret;
 159         }
 160
 161         for (i = 0; i < uc_pdata->mode_count; i++) {
 162                 if (reg_val == uc_pdata->mode[i].register_value)
 163                         return uc_pdata->mode[i].id;
 164         }
 165
 166         pr_err("Unknown operation mode for %s!", dev->name);
 167         return -EINVAL;
 168 }
 169
 170 static int out_set_mode(struct udevice *dev, int mode)
 171 {
 172         struct dm_regulator_uclass_platdata *uc_pdata;
 173         int reg_val = -1;
 174         uint reg;
 175         int ret;
 176         int i;
 177
 178         uc_pdata = dev_get_uclass_platdata(dev);
 179
 180         if (mode >= uc_pdata->mode_count)
 181                 return -EINVAL;
 182
 183         for (i = 0; i < uc_pdata->mode_count; i++) {
 184                 if (mode == uc_pdata->mode[i].id) {
 185                         reg_val = uc_pdata->mode[i].register_value;
 186                         break;
 187                 }
 188         }
 189
 190         if (reg_val == -1) {
 191                 pr_err("Unknown operation mode for %s!", dev->name);
 192                 return -EINVAL;
 193         }
 194
 195         reg = (dev->driver_data - 1) * OUT_REG_COUNT + OUT_REG_OM;
 196         ret = pmic_write(dev->parent, reg, (uint8_t *)&reg_val, 1);
 197         if (ret) {
 198                 pr_err("PMIC write failed: %d\n",  ret);
 199                 return ret;
 200         }
 201
 202         return 0;
 203 }
 204
 205 static int buck_get_voltage(struct udevice *dev)
 206 {
 207         return out_get_value(dev, SANDBOX_BUCK_COUNT, OUT_REG_UV,
 208                               buck_voltage_range);
 209 }
 210
 211 static int buck_set_voltage(struct udevice *dev, int uV)
 212 {
 213         return out_set_value(dev, SANDBOX_BUCK_COUNT, OUT_REG_UV,
 214                               buck_voltage_range, uV);
 215 }
 216
 217 static int buck_get_current(struct udevice *dev)
 218 {
 219         /* BUCK2 - unsupported */
 220         if (dev->driver_data == 2)
 221                 return -ENOSYS;
 222
 223         return out_get_value(dev, SANDBOX_BUCK_COUNT, OUT_REG_UA,
 224                               buck_current_range);
 225 }
 226
 227 static int buck_set_current(struct udevice *dev, int uA)
 228 {
 229         /* BUCK2 - unsupported */
 230         if (dev->driver_data == 2)
 231                 return -ENOSYS;
 232
 233         return out_set_value(dev, SANDBOX_BUCK_COUNT, OUT_REG_UA,
 234                               buck_current_range, uA);
 235 }
 236
 237 static int buck_get_enable(struct udevice *dev)
 238 {
 239         if (out_get_mode(dev) == BUCK_OM_OFF)
 240                 return false;
 241
 242         return true;
 243 }
 244
 245 static int buck_set_enable(struct udevice *dev, bool enable)
 246 {
 247         return out_set_mode(dev, enable ? BUCK_OM_ON : BUCK_OM_OFF);
 248 }
 249
 250 static int sandbox_buck_probe(struct udevice *dev)
 251 {
 252         struct dm_regulator_uclass_platdata *uc_pdata;
 253
 254         uc_pdata = dev_get_uclass_platdata(dev);
 255
 256         uc_pdata->type = REGULATOR_TYPE_BUCK;
 257         uc_pdata->mode = sandbox_buck_modes;
 258         uc_pdata->mode_count = ARRAY_SIZE(sandbox_buck_modes);
 259
 260         return 0;
 261 }
 262
 263 static const struct dm_regulator_ops sandbox_buck_ops = {
 264         .get_value   = buck_get_voltage,
 265         .set_value   = buck_set_voltage,
 266         .get_current = buck_get_current,
 267         .set_current = buck_set_current,
 268         .get_enable  = buck_get_enable,
 269         .set_enable  = buck_set_enable,
 270         .get_mode    = out_get_mode,
 271         .set_mode    = out_set_mode,
 272 };
 273
 274 U_BOOT_DRIVER(sandbox_buck) = {
 275         .name = SANDBOX_BUCK_DRIVER,
 276         .id = UCLASS_REGULATOR,
 277         .ops = &sandbox_buck_ops,
 278         .probe = sandbox_buck_probe,
 279 };
 280
 281 static int ldo_get_voltage(struct udevice *dev)
 282 {
 283         return out_get_value(dev, SANDBOX_LDO_COUNT, OUT_REG_UV,
 284                              ldo_voltage_range);
 285 }
 286
 287 static int ldo_set_voltage(struct udevice *dev, int uV)
 288 {
 289         return out_set_value(dev, SANDBOX_LDO_COUNT, OUT_REG_UV,
 290                              ldo_voltage_range, uV);
 291 }
 292
 293 static int ldo_get_current(struct udevice *dev)
 294 {
 295         /* LDO2 - unsupported */
 296         if (dev->driver_data == 2)
 297                 return -ENOSYS;
 298
 299         return out_get_value(dev, SANDBOX_LDO_COUNT, OUT_REG_UA,
 300                              ldo_current_range);
 301 }
 302
 303 static int ldo_set_current(struct udevice *dev, int uA)
 304 {
 305         /* LDO2 - unsupported */
 306         if (dev->driver_data == 2)
 307                 return -ENOSYS;
 308
 309         return out_set_value(dev, SANDBOX_LDO_COUNT, OUT_REG_UA,
 310                              ldo_current_range, uA);
 311 }
 312
 313 static int ldo_get_enable(struct udevice *dev)
 314 {
 315         if (out_get_mode(dev) == LDO_OM_OFF)
 316                 return false;
 317
 318         return true;
 319 }
 320
 321 static int ldo_set_enable(struct udevice *dev, bool enable)
 322 {
 323         return out_set_mode(dev, enable ? LDO_OM_ON : LDO_OM_OFF);
 324 }
 325
 326 static int sandbox_ldo_probe(struct udevice *dev)
 327 {
 328         struct dm_regulator_uclass_platdata *uc_pdata;
 329
 330         uc_pdata = dev_get_uclass_platdata(dev);
 331
 332         uc_pdata->type = REGULATOR_TYPE_LDO;
 333         uc_pdata->mode = sandbox_ldo_modes;
 334         uc_pdata->mode_count = ARRAY_SIZE(sandbox_ldo_modes);
 335
 336         return 0;
 337 }
 338
 339 static const struct dm_regulator_ops sandbox_ldo_ops = {
 340         .get_value   = ldo_get_voltage,
 341         .set_value   = ldo_set_voltage,
 342         .get_current = ldo_get_current,
 343         .set_current = ldo_set_current,
 344         .get_enable  = ldo_get_enable,
 345         .set_enable  = ldo_set_enable,
 346         .get_mode    = out_get_mode,
 347         .set_mode    = out_set_mode,
 348 };
 349
 350 U_BOOT_DRIVER(sandbox_ldo) = {
 351         .name = SANDBOX_LDO_DRIVER,
 352         .id = UCLASS_REGULATOR,
 353         .ops = &sandbox_ldo_ops,
 354         .probe = sandbox_ldo_probe,
 355 };