drivers/hwmon/aspeed-pwm-tacho.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (c) 2016 Google, Inc
   4  */
   5
   6 #include <linux/clk.h>
   7 #include <linux/delay.h>
   8 #include <linux/errno.h>
   9 #include <linux/gpio/consumer.h>
  10 #include <linux/hwmon.h>
  11 #include <linux/hwmon-sysfs.h>
  12 #include <linux/io.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/of_device.h>
  16 #include <linux/of_platform.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/regmap.h>
  19 #include <linux/reset.h>
  20 #include <linux/sysfs.h>
  21 #include <linux/thermal.h>
  22
  23 /* ASPEED PWM & FAN Tach Register Definition */
  24 #define ASPEED_PTCR_CTRL                0x00
  25 #define ASPEED_PTCR_CLK_CTRL            0x04
  26 #define ASPEED_PTCR_DUTY0_CTRL          0x08
  27 #define ASPEED_PTCR_DUTY1_CTRL          0x0c
  28 #define ASPEED_PTCR_TYPEM_CTRL          0x10
  29 #define ASPEED_PTCR_TYPEM_CTRL1         0x14
  30 #define ASPEED_PTCR_TYPEN_CTRL          0x18
  31 #define ASPEED_PTCR_TYPEN_CTRL1         0x1c
  32 #define ASPEED_PTCR_TACH_SOURCE         0x20
  33 #define ASPEED_PTCR_TRIGGER             0x28
  34 #define ASPEED_PTCR_RESULT              0x2c
  35 #define ASPEED_PTCR_INTR_CTRL           0x30
  36 #define ASPEED_PTCR_INTR_STS            0x34
  37 #define ASPEED_PTCR_TYPEM_LIMIT         0x38
  38 #define ASPEED_PTCR_TYPEN_LIMIT         0x3C
  39 #define ASPEED_PTCR_CTRL_EXT            0x40
  40 #define ASPEED_PTCR_CLK_CTRL_EXT        0x44
  41 #define ASPEED_PTCR_DUTY2_CTRL          0x48
  42 #define ASPEED_PTCR_DUTY3_CTRL          0x4c
  43 #define ASPEED_PTCR_TYPEO_CTRL          0x50
  44 #define ASPEED_PTCR_TYPEO_CTRL1         0x54
  45 #define ASPEED_PTCR_TACH_SOURCE_EXT     0x60
  46 #define ASPEED_PTCR_TYPEO_LIMIT         0x78
  47
  48 /* ASPEED_PTCR_CTRL : 0x00 - General Control Register */
  49 #define ASPEED_PTCR_CTRL_SET_PWMD_TYPE_PART1    15
  50 #define ASPEED_PTCR_CTRL_SET_PWMD_TYPE_PART2    6
  51 #define ASPEED_PTCR_CTRL_SET_PWMD_TYPE_MASK     (BIT(7) | BIT(15))
  52
  53 #define ASPEED_PTCR_CTRL_SET_PWMC_TYPE_PART1    14
  54 #define ASPEED_PTCR_CTRL_SET_PWMC_TYPE_PART2    5
  55 #define ASPEED_PTCR_CTRL_SET_PWMC_TYPE_MASK     (BIT(6) | BIT(14))
  56
  57 #define ASPEED_PTCR_CTRL_SET_PWMB_TYPE_PART1    13
  58 #define ASPEED_PTCR_CTRL_SET_PWMB_TYPE_PART2    4
  59 #define ASPEED_PTCR_CTRL_SET_PWMB_TYPE_MASK     (BIT(5) | BIT(13))
  60
  61 #define ASPEED_PTCR_CTRL_SET_PWMA_TYPE_PART1    12
  62 #define ASPEED_PTCR_CTRL_SET_PWMA_TYPE_PART2    3
  63 #define ASPEED_PTCR_CTRL_SET_PWMA_TYPE_MASK     (BIT(4) | BIT(12))
  64
  65 #define ASPEED_PTCR_CTRL_FAN_NUM_EN(x)  BIT(16 + (x))
  66
  67 #define ASPEED_PTCR_CTRL_PWMD_EN        BIT(11)
  68 #define ASPEED_PTCR_CTRL_PWMC_EN        BIT(10)
  69 #define ASPEED_PTCR_CTRL_PWMB_EN        BIT(9)
  70 #define ASPEED_PTCR_CTRL_PWMA_EN        BIT(8)
  71
  72 #define ASPEED_PTCR_CTRL_CLK_SRC        BIT(1)
  73 #define ASPEED_PTCR_CTRL_CLK_EN         BIT(0)
  74
  75 /* ASPEED_PTCR_CLK_CTRL : 0x04 - Clock Control Register */
  76 /* TYPE N */
  77 #define ASPEED_PTCR_CLK_CTRL_TYPEN_MASK         GENMASK(31, 16)
  78 #define ASPEED_PTCR_CLK_CTRL_TYPEN_UNIT         24
  79 #define ASPEED_PTCR_CLK_CTRL_TYPEN_H            20
  80 #define ASPEED_PTCR_CLK_CTRL_TYPEN_L            16
  81 /* TYPE M */
  82 #define ASPEED_PTCR_CLK_CTRL_TYPEM_MASK         GENMASK(15, 0)
  83 #define ASPEED_PTCR_CLK_CTRL_TYPEM_UNIT         8
  84 #define ASPEED_PTCR_CLK_CTRL_TYPEM_H            4
  85 #define ASPEED_PTCR_CLK_CTRL_TYPEM_L            0
  86
  87 /*
  88  * ASPEED_PTCR_DUTY_CTRL/1/2/3 : 0x08/0x0C/0x48/0x4C - PWM-FAN duty control
  89  * 0/1/2/3 register
  90  */
  91 #define DUTY_CTRL_PWM2_FALL_POINT       24
  92 #define DUTY_CTRL_PWM2_RISE_POINT       16
  93 #define DUTY_CTRL_PWM2_RISE_FALL_MASK   GENMASK(31, 16)
  94 #define DUTY_CTRL_PWM1_FALL_POINT       8
  95 #define DUTY_CTRL_PWM1_RISE_POINT       0
  96 #define DUTY_CTRL_PWM1_RISE_FALL_MASK   GENMASK(15, 0)
  97
  98 /* ASPEED_PTCR_TYPEM_CTRL : 0x10/0x18/0x50 - Type M/N/O Ctrl 0 Register */
  99 #define TYPE_CTRL_FAN_MASK              (GENMASK(5, 1) | GENMASK(31, 16))
 100 #define TYPE_CTRL_FAN1_MASK             GENMASK(31, 0)
 101 #define TYPE_CTRL_FAN_PERIOD            16
 102 #define TYPE_CTRL_FAN_MODE              4
 103 #define TYPE_CTRL_FAN_DIVISION          1
 104 #define TYPE_CTRL_FAN_TYPE_EN           1
 105
 106 /* ASPEED_PTCR_TACH_SOURCE : 0x20/0x60 - Tach Source Register */
 107 /* bit [0,1] at 0x20, bit [2] at 0x60 */
 108 #define TACH_PWM_SOURCE_BIT01(x)        ((x) * 2)
 109 #define TACH_PWM_SOURCE_BIT2(x)         ((x) * 2)
 110 #define TACH_PWM_SOURCE_MASK_BIT01(x)   (0x3 << ((x) * 2))
 111 #define TACH_PWM_SOURCE_MASK_BIT2(x)    BIT((x) * 2)
 112
 113 /* ASPEED_PTCR_RESULT : 0x2c - Result Register */
 114 #define RESULT_STATUS_MASK              BIT(31)
 115 #define RESULT_VALUE_MASK               0xfffff
 116
 117 /* ASPEED_PTCR_CTRL_EXT : 0x40 - General Control Extension #1 Register */
 118 #define ASPEED_PTCR_CTRL_SET_PWMH_TYPE_PART1    15
 119 #define ASPEED_PTCR_CTRL_SET_PWMH_TYPE_PART2    6
 120 #define ASPEED_PTCR_CTRL_SET_PWMH_TYPE_MASK     (BIT(7) | BIT(15))
 121
 122 #define ASPEED_PTCR_CTRL_SET_PWMG_TYPE_PART1    14
 123 #define ASPEED_PTCR_CTRL_SET_PWMG_TYPE_PART2    5
 124 #define ASPEED_PTCR_CTRL_SET_PWMG_TYPE_MASK     (BIT(6) | BIT(14))
 125
 126 #define ASPEED_PTCR_CTRL_SET_PWMF_TYPE_PART1    13
 127 #define ASPEED_PTCR_CTRL_SET_PWMF_TYPE_PART2    4
 128 #define ASPEED_PTCR_CTRL_SET_PWMF_TYPE_MASK     (BIT(5) | BIT(13))
 129
 130 #define ASPEED_PTCR_CTRL_SET_PWME_TYPE_PART1    12
 131 #define ASPEED_PTCR_CTRL_SET_PWME_TYPE_PART2    3
 132 #define ASPEED_PTCR_CTRL_SET_PWME_TYPE_MASK     (BIT(4) | BIT(12))
 133
 134 #define ASPEED_PTCR_CTRL_PWMH_EN        BIT(11)
 135 #define ASPEED_PTCR_CTRL_PWMG_EN        BIT(10)
 136 #define ASPEED_PTCR_CTRL_PWMF_EN        BIT(9)
 137 #define ASPEED_PTCR_CTRL_PWME_EN        BIT(8)
 138
 139 /* ASPEED_PTCR_CLK_EXT_CTRL : 0x44 - Clock Control Extension #1 Register */
 140 /* TYPE O */
 141 #define ASPEED_PTCR_CLK_CTRL_TYPEO_MASK         GENMASK(15, 0)
 142 #define ASPEED_PTCR_CLK_CTRL_TYPEO_UNIT         8
 143 #define ASPEED_PTCR_CLK_CTRL_TYPEO_H            4
 144 #define ASPEED_PTCR_CLK_CTRL_TYPEO_L            0
 145
 146 #define PWM_MAX 255
 147
 148 #define BOTH_EDGES 0x02 /* 10b */
 149
 150 #define M_PWM_DIV_H 0x00
 151 #define M_PWM_DIV_L 0x05
 152 #define M_PWM_PERIOD 0x5F
 153 #define M_TACH_CLK_DIV 0x00
 154 /*
 155  * 5:4 Type N fan tach mode selection bit:
 156  * 00: falling
 157  * 01: rising
 158  * 10: both
 159  * 11: reserved.
 160  */
 161 #define M_TACH_MODE 0x02 /* 10b */
 162 #define M_TACH_UNIT 0x0420
 163 #define INIT_FAN_CTRL 0xFF
 164
 165 /* How long we sleep in us while waiting for an RPM result. */
 166 #define ASPEED_RPM_STATUS_SLEEP_USEC    500
 167
 168 #define MAX_CDEV_NAME_LEN 16
 169
 170 struct aspeed_cooling_device {
 171         char name[16];
 172         struct aspeed_pwm_tacho_data *priv;
 173         struct thermal_cooling_device *tcdev;
 174         int pwm_port;
 175         u8 *cooling_levels;
 176         u8 max_state;
 177         u8 cur_state;
 178 };
 179
 180 struct aspeed_pwm_tacho_data {
 181         struct regmap *regmap;
 182         struct reset_control *rst;
 183         unsigned long clk_freq;
 184         bool pwm_present[8];
 185         bool fan_tach_present[16];
 186         u8 type_pwm_clock_unit[3];
 187         u8 type_pwm_clock_division_h[3];
 188         u8 type_pwm_clock_division_l[3];
 189         u8 type_fan_tach_clock_division[3];
 190         u8 type_fan_tach_mode[3];
 191         u16 type_fan_tach_unit[3];
 192         u8 pwm_port_type[8];
 193         u8 pwm_port_fan_ctrl[8];
 194         u8 fan_tach_ch_source[16];
 195         struct aspeed_cooling_device *cdev[8];
 196         const struct attribute_group *groups[3];
 197 };
 198
 199 enum type { TYPEM, TYPEN, TYPEO };
 200
 201 struct type_params {
 202         u32 l_value;
 203         u32 h_value;
 204         u32 unit_value;
 205         u32 clk_ctrl_mask;
 206         u32 clk_ctrl_reg;
 207         u32 ctrl_reg;
 208         u32 ctrl_reg1;
 209 };
 210
 211 static const struct type_params type_params[] = {
 212         [TYPEM] = {
 213                 .l_value = ASPEED_PTCR_CLK_CTRL_TYPEM_L,
 214                 .h_value = ASPEED_PTCR_CLK_CTRL_TYPEM_H,
 215                 .unit_value = ASPEED_PTCR_CLK_CTRL_TYPEM_UNIT,
 216                 .clk_ctrl_mask = ASPEED_PTCR_CLK_CTRL_TYPEM_MASK,
 217                 .clk_ctrl_reg = ASPEED_PTCR_CLK_CTRL,
 218                 .ctrl_reg = ASPEED_PTCR_TYPEM_CTRL,
 219                 .ctrl_reg1 = ASPEED_PTCR_TYPEM_CTRL1,
 220         },
 221         [TYPEN] = {
 222                 .l_value = ASPEED_PTCR_CLK_CTRL_TYPEN_L,
 223                 .h_value = ASPEED_PTCR_CLK_CTRL_TYPEN_H,
 224                 .unit_value = ASPEED_PTCR_CLK_CTRL_TYPEN_UNIT,
 225                 .clk_ctrl_mask = ASPEED_PTCR_CLK_CTRL_TYPEN_MASK,
 226                 .clk_ctrl_reg = ASPEED_PTCR_CLK_CTRL,
 227                 .ctrl_reg = ASPEED_PTCR_TYPEN_CTRL,
 228                 .ctrl_reg1 = ASPEED_PTCR_TYPEN_CTRL1,
 229         },
 230         [TYPEO] = {
 231                 .l_value = ASPEED_PTCR_CLK_CTRL_TYPEO_L,
 232                 .h_value = ASPEED_PTCR_CLK_CTRL_TYPEO_H,
 233                 .unit_value = ASPEED_PTCR_CLK_CTRL_TYPEO_UNIT,
 234                 .clk_ctrl_mask = ASPEED_PTCR_CLK_CTRL_TYPEO_MASK,
 235                 .clk_ctrl_reg = ASPEED_PTCR_CLK_CTRL_EXT,
 236                 .ctrl_reg = ASPEED_PTCR_TYPEO_CTRL,
 237                 .ctrl_reg1 = ASPEED_PTCR_TYPEO_CTRL1,
 238         }
 239 };
 240
 241 enum pwm_port { PWMA, PWMB, PWMC, PWMD, PWME, PWMF, PWMG, PWMH };
 242
 243 struct pwm_port_params {
 244         u32 pwm_en;
 245         u32 ctrl_reg;
 246         u32 type_part1;
 247         u32 type_part2;
 248         u32 type_mask;
 249         u32 duty_ctrl_rise_point;
 250         u32 duty_ctrl_fall_point;
 251         u32 duty_ctrl_reg;
 252         u32 duty_ctrl_rise_fall_mask;
 253 };
 254
 255 static const struct pwm_port_params pwm_port_params[] = {
 256         [PWMA] = {
 257                 .pwm_en = ASPEED_PTCR_CTRL_PWMA_EN,
 258                 .ctrl_reg = ASPEED_PTCR_CTRL,
 259                 .type_part1 = ASPEED_PTCR_CTRL_SET_PWMA_TYPE_PART1,
 260                 .type_part2 = ASPEED_PTCR_CTRL_SET_PWMA_TYPE_PART2,
 261                 .type_mask = ASPEED_PTCR_CTRL_SET_PWMA_TYPE_MASK,
 262                 .duty_ctrl_rise_point = DUTY_CTRL_PWM1_RISE_POINT,
 263                 .duty_ctrl_fall_point = DUTY_CTRL_PWM1_FALL_POINT,
 264                 .duty_ctrl_reg = ASPEED_PTCR_DUTY0_CTRL,
 265                 .duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM1_RISE_FALL_MASK,
 266         },
 267         [PWMB] = {
 268                 .pwm_en = ASPEED_PTCR_CTRL_PWMB_EN,
 269                 .ctrl_reg = ASPEED_PTCR_CTRL,
 270                 .type_part1 = ASPEED_PTCR_CTRL_SET_PWMB_TYPE_PART1,
 271                 .type_part2 = ASPEED_PTCR_CTRL_SET_PWMB_TYPE_PART2,
 272                 .type_mask = ASPEED_PTCR_CTRL_SET_PWMB_TYPE_MASK,
 273                 .duty_ctrl_rise_point = DUTY_CTRL_PWM2_RISE_POINT,
 274                 .duty_ctrl_fall_point = DUTY_CTRL_PWM2_FALL_POINT,
 275                 .duty_ctrl_reg = ASPEED_PTCR_DUTY0_CTRL,
 276                 .duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM2_RISE_FALL_MASK,
 277         },
 278         [PWMC] = {
 279                 .pwm_en = ASPEED_PTCR_CTRL_PWMC_EN,
 280                 .ctrl_reg = ASPEED_PTCR_CTRL,
 281                 .type_part1 = ASPEED_PTCR_CTRL_SET_PWMC_TYPE_PART1,
 282                 .type_part2 = ASPEED_PTCR_CTRL_SET_PWMC_TYPE_PART2,
 283                 .type_mask = ASPEED_PTCR_CTRL_SET_PWMC_TYPE_MASK,
 284                 .duty_ctrl_rise_point = DUTY_CTRL_PWM1_RISE_POINT,
 285                 .duty_ctrl_fall_point = DUTY_CTRL_PWM1_FALL_POINT,
 286                 .duty_ctrl_reg = ASPEED_PTCR_DUTY1_CTRL,
 287                 .duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM1_RISE_FALL_MASK,
 288         },
 289         [PWMD] = {
 290                 .pwm_en = ASPEED_PTCR_CTRL_PWMD_EN,
 291                 .ctrl_reg = ASPEED_PTCR_CTRL,
 292                 .type_part1 = ASPEED_PTCR_CTRL_SET_PWMD_TYPE_PART1,
 293                 .type_part2 = ASPEED_PTCR_CTRL_SET_PWMD_TYPE_PART2,
 294                 .type_mask = ASPEED_PTCR_CTRL_SET_PWMD_TYPE_MASK,
 295                 .duty_ctrl_rise_point = DUTY_CTRL_PWM2_RISE_POINT,
 296                 .duty_ctrl_fall_point = DUTY_CTRL_PWM2_FALL_POINT,
 297                 .duty_ctrl_reg = ASPEED_PTCR_DUTY1_CTRL,
 298                 .duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM2_RISE_FALL_MASK,
 299         },
 300         [PWME] = {
 301                 .pwm_en = ASPEED_PTCR_CTRL_PWME_EN,
 302                 .ctrl_reg = ASPEED_PTCR_CTRL_EXT,
 303                 .type_part1 = ASPEED_PTCR_CTRL_SET_PWME_TYPE_PART1,
 304                 .type_part2 = ASPEED_PTCR_CTRL_SET_PWME_TYPE_PART2,
 305                 .type_mask = ASPEED_PTCR_CTRL_SET_PWME_TYPE_MASK,
 306                 .duty_ctrl_rise_point = DUTY_CTRL_PWM1_RISE_POINT,
 307                 .duty_ctrl_fall_point = DUTY_CTRL_PWM1_FALL_POINT,
 308                 .duty_ctrl_reg = ASPEED_PTCR_DUTY2_CTRL,
 309                 .duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM1_RISE_FALL_MASK,
 310         },
 311         [PWMF] = {
 312                 .pwm_en = ASPEED_PTCR_CTRL_PWMF_EN,
 313                 .ctrl_reg = ASPEED_PTCR_CTRL_EXT,
 314                 .type_part1 = ASPEED_PTCR_CTRL_SET_PWMF_TYPE_PART1,
 315                 .type_part2 = ASPEED_PTCR_CTRL_SET_PWMF_TYPE_PART2,
 316                 .type_mask = ASPEED_PTCR_CTRL_SET_PWMF_TYPE_MASK,
 317                 .duty_ctrl_rise_point = DUTY_CTRL_PWM2_RISE_POINT,
 318                 .duty_ctrl_fall_point = DUTY_CTRL_PWM2_FALL_POINT,
 319                 .duty_ctrl_reg = ASPEED_PTCR_DUTY2_CTRL,
 320                 .duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM2_RISE_FALL_MASK,
 321         },
 322         [PWMG] = {
 323                 .pwm_en = ASPEED_PTCR_CTRL_PWMG_EN,
 324                 .ctrl_reg = ASPEED_PTCR_CTRL_EXT,
 325                 .type_part1 = ASPEED_PTCR_CTRL_SET_PWMG_TYPE_PART1,
 326                 .type_part2 = ASPEED_PTCR_CTRL_SET_PWMG_TYPE_PART2,
 327                 .type_mask = ASPEED_PTCR_CTRL_SET_PWMG_TYPE_MASK,
 328                 .duty_ctrl_rise_point = DUTY_CTRL_PWM1_RISE_POINT,
 329                 .duty_ctrl_fall_point = DUTY_CTRL_PWM1_FALL_POINT,
 330                 .duty_ctrl_reg = ASPEED_PTCR_DUTY3_CTRL,
 331                 .duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM1_RISE_FALL_MASK,
 332         },
 333         [PWMH] = {
 334                 .pwm_en = ASPEED_PTCR_CTRL_PWMH_EN,
 335                 .ctrl_reg = ASPEED_PTCR_CTRL_EXT,
 336                 .type_part1 = ASPEED_PTCR_CTRL_SET_PWMH_TYPE_PART1,
 337                 .type_part2 = ASPEED_PTCR_CTRL_SET_PWMH_TYPE_PART2,
 338                 .type_mask = ASPEED_PTCR_CTRL_SET_PWMH_TYPE_MASK,
 339                 .duty_ctrl_rise_point = DUTY_CTRL_PWM2_RISE_POINT,
 340                 .duty_ctrl_fall_point = DUTY_CTRL_PWM2_FALL_POINT,
 341                 .duty_ctrl_reg = ASPEED_PTCR_DUTY3_CTRL,
 342                 .duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM2_RISE_FALL_MASK,
 343         }
 344 };
 345
 346 static int regmap_aspeed_pwm_tacho_reg_write(void *context, unsigned int reg,
 347                                              unsigned int val)
 348 {
 349         void __iomem *regs = (void __iomem *)context;
 350
 351         writel(val, regs + reg);
 352         return 0;
 353 }
 354
 355 static int regmap_aspeed_pwm_tacho_reg_read(void *context, unsigned int reg,
 356                                             unsigned int *val)
 357 {
 358         void __iomem *regs = (void __iomem *)context;
 359
 360         *val = readl(regs + reg);
 361         return 0;
 362 }
 363
 364 static const struct regmap_config aspeed_pwm_tacho_regmap_config = {
 365         .reg_bits = 32,
 366         .val_bits = 32,
 367         .reg_stride = 4,
 368         .max_register = ASPEED_PTCR_TYPEO_LIMIT,
 369         .reg_write = regmap_aspeed_pwm_tacho_reg_write,
 370         .reg_read = regmap_aspeed_pwm_tacho_reg_read,
 371         .fast_io = true,
 372 };
 373
 374 static void aspeed_set_clock_enable(struct regmap *regmap, bool val)
 375 {
 376         regmap_update_bits(regmap, ASPEED_PTCR_CTRL,
 377                            ASPEED_PTCR_CTRL_CLK_EN,
 378                            val ? ASPEED_PTCR_CTRL_CLK_EN : 0);
 379 }
 380
 381 static void aspeed_set_clock_source(struct regmap *regmap, int val)
 382 {
 383         regmap_update_bits(regmap, ASPEED_PTCR_CTRL,
 384                            ASPEED_PTCR_CTRL_CLK_SRC,
 385                            val ? ASPEED_PTCR_CTRL_CLK_SRC : 0);
 386 }
 387
 388 static void aspeed_set_pwm_clock_values(struct regmap *regmap, u8 type,
 389                                         u8 div_high, u8 div_low, u8 unit)
 390 {
 391         u32 reg_value = ((div_high << type_params[type].h_value) |
 392                          (div_low << type_params[type].l_value) |
 393                          (unit << type_params[type].unit_value));
 394
 395         regmap_update_bits(regmap, type_params[type].clk_ctrl_reg,
 396                            type_params[type].clk_ctrl_mask, reg_value);
 397 }
 398
 399 static void aspeed_set_pwm_port_enable(struct regmap *regmap, u8 pwm_port,
 400                                        bool enable)
 401 {
 402         regmap_update_bits(regmap, pwm_port_params[pwm_port].ctrl_reg,
 403                            pwm_port_params[pwm_port].pwm_en,
 404                            enable ? pwm_port_params[pwm_port].pwm_en : 0);
 405 }
 406
 407 static void aspeed_set_pwm_port_type(struct regmap *regmap,
 408                                      u8 pwm_port, u8 type)
 409 {
 410         u32 reg_value = (type & 0x1) << pwm_port_params[pwm_port].type_part1;
 411
 412         reg_value |= (type & 0x2) << pwm_port_params[pwm_port].type_part2;
 413
 414         regmap_update_bits(regmap, pwm_port_params[pwm_port].ctrl_reg,
 415                            pwm_port_params[pwm_port].type_mask, reg_value);
 416 }
 417
 418 static void aspeed_set_pwm_port_duty_rising_falling(struct regmap *regmap,
 419                                                     u8 pwm_port, u8 rising,
 420                                                     u8 falling)
 421 {
 422         u32 reg_value = (rising <<
 423                          pwm_port_params[pwm_port].duty_ctrl_rise_point);
 424         reg_value |= (falling <<
 425                       pwm_port_params[pwm_port].duty_ctrl_fall_point);
 426
 427         regmap_update_bits(regmap, pwm_port_params[pwm_port].duty_ctrl_reg,
 428                            pwm_port_params[pwm_port].duty_ctrl_rise_fall_mask,
 429                            reg_value);
 430 }
 431
 432 static void aspeed_set_tacho_type_enable(struct regmap *regmap, u8 type,
 433                                          bool enable)
 434 {
 435         regmap_update_bits(regmap, type_params[type].ctrl_reg,
 436                            TYPE_CTRL_FAN_TYPE_EN,
 437                            enable ? TYPE_CTRL_FAN_TYPE_EN : 0);
 438 }
 439
 440 static void aspeed_set_tacho_type_values(struct regmap *regmap, u8 type,
 441                                          u8 mode, u16 unit, u8 division)
 442 {
 443         u32 reg_value = ((mode << TYPE_CTRL_FAN_MODE) |
 444                          (unit << TYPE_CTRL_FAN_PERIOD) |
 445                          (division << TYPE_CTRL_FAN_DIVISION));
 446
 447         regmap_update_bits(regmap, type_params[type].ctrl_reg,
 448                            TYPE_CTRL_FAN_MASK, reg_value);
 449         regmap_update_bits(regmap, type_params[type].ctrl_reg1,
 450                            TYPE_CTRL_FAN1_MASK, unit << 16);
 451 }
 452
 453 static void aspeed_set_fan_tach_ch_enable(struct regmap *regmap, u8 fan_tach_ch,
 454                                           bool enable)
 455 {
 456         regmap_update_bits(regmap, ASPEED_PTCR_CTRL,
 457                            ASPEED_PTCR_CTRL_FAN_NUM_EN(fan_tach_ch),
 458                            enable ?
 459                            ASPEED_PTCR_CTRL_FAN_NUM_EN(fan_tach_ch) : 0);
 460 }
 461
 462 static void aspeed_set_fan_tach_ch_source(struct regmap *regmap, u8 fan_tach_ch,
 463                                           u8 fan_tach_ch_source)
 464 {
 465         u32 reg_value1 = ((fan_tach_ch_source & 0x3) <<
 466                           TACH_PWM_SOURCE_BIT01(fan_tach_ch));
 467         u32 reg_value2 = (((fan_tach_ch_source & 0x4) >> 2) <<
 468                           TACH_PWM_SOURCE_BIT2(fan_tach_ch));
 469
 470         regmap_update_bits(regmap, ASPEED_PTCR_TACH_SOURCE,
 471                            TACH_PWM_SOURCE_MASK_BIT01(fan_tach_ch),
 472                            reg_value1);
 473
 474         regmap_update_bits(regmap, ASPEED_PTCR_TACH_SOURCE_EXT,
 475                            TACH_PWM_SOURCE_MASK_BIT2(fan_tach_ch),
 476                            reg_value2);
 477 }
 478
 479 static void aspeed_set_pwm_port_fan_ctrl(struct aspeed_pwm_tacho_data *priv,
 480                                          u8 index, u8 fan_ctrl)
 481 {
 482         u16 period, dc_time_on;
 483
 484         period = priv->type_pwm_clock_unit[priv->pwm_port_type[index]];
 485         period += 1;
 486         dc_time_on = (fan_ctrl * period) / PWM_MAX;
 487
 488         if (dc_time_on == 0) {
 489                 aspeed_set_pwm_port_enable(priv->regmap, index, false);
 490         } else {
 491                 if (dc_time_on == period)
 492                         dc_time_on = 0;
 493
 494                 aspeed_set_pwm_port_duty_rising_falling(priv->regmap, index, 0,
 495                                                         dc_time_on);
 496                 aspeed_set_pwm_port_enable(priv->regmap, index, true);
 497         }
 498 }
 499
 500 static u32 aspeed_get_fan_tach_ch_measure_period(struct aspeed_pwm_tacho_data
 501                                                  *priv, u8 type)
 502 {
 503         u32 clk;
 504         u16 tacho_unit;
 505         u8 clk_unit, div_h, div_l, tacho_div;
 506
 507         clk = priv->clk_freq;
 508         clk_unit = priv->type_pwm_clock_unit[type];
 509         div_h = priv->type_pwm_clock_division_h[type];
 510         div_h = 0x1 << div_h;
 511         div_l = priv->type_pwm_clock_division_l[type];
 512         if (div_l == 0)
 513                 div_l = 1;
 514         else
 515                 div_l = div_l * 2;
 516
 517         tacho_unit = priv->type_fan_tach_unit[type];
 518         tacho_div = priv->type_fan_tach_clock_division[type];
 519
 520         tacho_div = 0x4 << (tacho_div * 2);
 521         return clk / (clk_unit * div_h * div_l * tacho_div * tacho_unit);
 522 }
 523
 524 static int aspeed_get_fan_tach_ch_rpm(struct aspeed_pwm_tacho_data *priv,
 525                                       u8 fan_tach_ch)
 526 {
 527         u32 raw_data, tach_div, clk_source, msec, usec, val;
 528         u8 fan_tach_ch_source, type, mode, both;
 529         int ret;
 530
 531         regmap_write(priv->regmap, ASPEED_PTCR_TRIGGER, 0);
 532         regmap_write(priv->regmap, ASPEED_PTCR_TRIGGER, 0x1 << fan_tach_ch);
 533
 534         fan_tach_ch_source = priv->fan_tach_ch_source[fan_tach_ch];
 535         type = priv->pwm_port_type[fan_tach_ch_source];
 536
 537         msec = (1000 / aspeed_get_fan_tach_ch_measure_period(priv, type));
 538         usec = msec * 1000;
 539
 540         ret = regmap_read_poll_timeout(
 541                 priv->regmap,
 542                 ASPEED_PTCR_RESULT,
 543                 val,
 544                 (val & RESULT_STATUS_MASK),
 545                 ASPEED_RPM_STATUS_SLEEP_USEC,
 546                 usec);
 547
 548         /* return -ETIMEDOUT if we didn't get an answer. */
 549         if (ret)
 550                 return ret;
 551
 552         raw_data = val & RESULT_VALUE_MASK;
 553         tach_div = priv->type_fan_tach_clock_division[type];
 554         /*
 555          * We need the mode to determine if the raw_data is double (from
 556          * counting both edges).
 557          */
 558         mode = priv->type_fan_tach_mode[type];
 559         both = (mode & BOTH_EDGES) ? 1 : 0;
 560
 561         tach_div = (0x4 << both) << (tach_div * 2);
 562         clk_source = priv->clk_freq;
 563
 564         if (raw_data == 0)
 565                 return 0;
 566
 567         return (clk_source * 60) / (2 * raw_data * tach_div);
 568 }
 569
 570 static ssize_t pwm_store(struct device *dev, struct device_attribute *attr,
 571                          const char *buf, size_t count)
 572 {
 573         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 574         int index = sensor_attr->index;
 575         int ret;
 576         struct aspeed_pwm_tacho_data *priv = dev_get_drvdata(dev);
 577         long fan_ctrl;
 578
 579         ret = kstrtol(buf, 10, &fan_ctrl);
 580         if (ret != 0)
 581                 return ret;
 582
 583         if (fan_ctrl < 0 || fan_ctrl > PWM_MAX)
 584                 return -EINVAL;
 585
 586         if (priv->pwm_port_fan_ctrl[index] == fan_ctrl)
 587                 return count;
 588
 589         priv->pwm_port_fan_ctrl[index] = fan_ctrl;
 590         aspeed_set_pwm_port_fan_ctrl(priv, index, fan_ctrl);
 591
 592         return count;
 593 }
 594
 595 static ssize_t pwm_show(struct device *dev, struct device_attribute *attr,
 596                         char *buf)
 597 {
 598         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 599         int index = sensor_attr->index;
 600         struct aspeed_pwm_tacho_data *priv = dev_get_drvdata(dev);
 601
 602         return sprintf(buf, "%u\n", priv->pwm_port_fan_ctrl[index]);
 603 }
 604
 605 static ssize_t rpm_show(struct device *dev, struct device_attribute *attr,
 606                         char *buf)
 607 {
 608         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 609         int index = sensor_attr->index;
 610         int rpm;
 611         struct aspeed_pwm_tacho_data *priv = dev_get_drvdata(dev);
 612
 613         rpm = aspeed_get_fan_tach_ch_rpm(priv, index);
 614         if (rpm < 0)
 615                 return rpm;
 616
 617         return sprintf(buf, "%d\n", rpm);
 618 }
 619
 620 static umode_t pwm_is_visible(struct kobject *kobj,
 621                               struct attribute *a, int index)
 622 {
 623         struct device *dev = kobj_to_dev(kobj);
 624         struct aspeed_pwm_tacho_data *priv = dev_get_drvdata(dev);
 625
 626         if (!priv->pwm_present[index])
 627                 return 0;
 628         return a->mode;
 629 }
 630
 631 static umode_t fan_dev_is_visible(struct kobject *kobj,
 632                                   struct attribute *a, int index)
 633 {
 634         struct device *dev = kobj_to_dev(kobj);
 635         struct aspeed_pwm_tacho_data *priv = dev_get_drvdata(dev);
 636
 637         if (!priv->fan_tach_present[index])
 638                 return 0;
 639         return a->mode;
 640 }
 641
 642 static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0);
 643 static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1);
 644 static SENSOR_DEVICE_ATTR_RW(pwm3, pwm, 2);
 645 static SENSOR_DEVICE_ATTR_RW(pwm4, pwm, 3);
 646 static SENSOR_DEVICE_ATTR_RW(pwm5, pwm, 4);
 647 static SENSOR_DEVICE_ATTR_RW(pwm6, pwm, 5);
 648 static SENSOR_DEVICE_ATTR_RW(pwm7, pwm, 6);
 649 static SENSOR_DEVICE_ATTR_RW(pwm8, pwm, 7);
 650 static struct attribute *pwm_dev_attrs[] = {
 651         &sensor_dev_attr_pwm1.dev_attr.attr,
 652         &sensor_dev_attr_pwm2.dev_attr.attr,
 653         &sensor_dev_attr_pwm3.dev_attr.attr,
 654         &sensor_dev_attr_pwm4.dev_attr.attr,
 655         &sensor_dev_attr_pwm5.dev_attr.attr,
 656         &sensor_dev_attr_pwm6.dev_attr.attr,
 657         &sensor_dev_attr_pwm7.dev_attr.attr,
 658         &sensor_dev_attr_pwm8.dev_attr.attr,
 659         NULL,
 660 };
 661
 662 static const struct attribute_group pwm_dev_group = {
 663         .attrs = pwm_dev_attrs,
 664         .is_visible = pwm_is_visible,
 665 };
 666
 667 static SENSOR_DEVICE_ATTR_RO(fan1_input, rpm, 0);
 668 static SENSOR_DEVICE_ATTR_RO(fan2_input, rpm, 1);
 669 static SENSOR_DEVICE_ATTR_RO(fan3_input, rpm, 2);
 670 static SENSOR_DEVICE_ATTR_RO(fan4_input, rpm, 3);
 671 static SENSOR_DEVICE_ATTR_RO(fan5_input, rpm, 4);
 672 static SENSOR_DEVICE_ATTR_RO(fan6_input, rpm, 5);
 673 static SENSOR_DEVICE_ATTR_RO(fan7_input, rpm, 6);
 674 static SENSOR_DEVICE_ATTR_RO(fan8_input, rpm, 7);
 675 static SENSOR_DEVICE_ATTR_RO(fan9_input, rpm, 8);
 676 static SENSOR_DEVICE_ATTR_RO(fan10_input, rpm, 9);
 677 static SENSOR_DEVICE_ATTR_RO(fan11_input, rpm, 10);
 678 static SENSOR_DEVICE_ATTR_RO(fan12_input, rpm, 11);
 679 static SENSOR_DEVICE_ATTR_RO(fan13_input, rpm, 12);
 680 static SENSOR_DEVICE_ATTR_RO(fan14_input, rpm, 13);
 681 static SENSOR_DEVICE_ATTR_RO(fan15_input, rpm, 14);
 682 static SENSOR_DEVICE_ATTR_RO(fan16_input, rpm, 15);
 683 static struct attribute *fan_dev_attrs[] = {
 684         &sensor_dev_attr_fan1_input.dev_attr.attr,
 685         &sensor_dev_attr_fan2_input.dev_attr.attr,
 686         &sensor_dev_attr_fan3_input.dev_attr.attr,
 687         &sensor_dev_attr_fan4_input.dev_attr.attr,
 688         &sensor_dev_attr_fan5_input.dev_attr.attr,
 689         &sensor_dev_attr_fan6_input.dev_attr.attr,
 690         &sensor_dev_attr_fan7_input.dev_attr.attr,
 691         &sensor_dev_attr_fan8_input.dev_attr.attr,
 692         &sensor_dev_attr_fan9_input.dev_attr.attr,
 693         &sensor_dev_attr_fan10_input.dev_attr.attr,
 694         &sensor_dev_attr_fan11_input.dev_attr.attr,
 695         &sensor_dev_attr_fan12_input.dev_attr.attr,
 696         &sensor_dev_attr_fan13_input.dev_attr.attr,
 697         &sensor_dev_attr_fan14_input.dev_attr.attr,
 698         &sensor_dev_attr_fan15_input.dev_attr.attr,
 699         &sensor_dev_attr_fan16_input.dev_attr.attr,
 700         NULL
 701 };
 702
 703 static const struct attribute_group fan_dev_group = {
 704         .attrs = fan_dev_attrs,
 705         .is_visible = fan_dev_is_visible,
 706 };
 707
 708 /*
 709  * The clock type is type M :
 710  * The PWM frequency = 24MHz / (type M clock division L bit *
 711  * type M clock division H bit * (type M PWM period bit + 1))
 712  */
 713 static void aspeed_create_type(struct aspeed_pwm_tacho_data *priv)
 714 {
 715         priv->type_pwm_clock_division_h[TYPEM] = M_PWM_DIV_H;
 716         priv->type_pwm_clock_division_l[TYPEM] = M_PWM_DIV_L;
 717         priv->type_pwm_clock_unit[TYPEM] = M_PWM_PERIOD;
 718         aspeed_set_pwm_clock_values(priv->regmap, TYPEM, M_PWM_DIV_H,
 719                                     M_PWM_DIV_L, M_PWM_PERIOD);
 720         aspeed_set_tacho_type_enable(priv->regmap, TYPEM, true);
 721         priv->type_fan_tach_clock_division[TYPEM] = M_TACH_CLK_DIV;
 722         priv->type_fan_tach_unit[TYPEM] = M_TACH_UNIT;
 723         priv->type_fan_tach_mode[TYPEM] = M_TACH_MODE;
 724         aspeed_set_tacho_type_values(priv->regmap, TYPEM, M_TACH_MODE,
 725                                      M_TACH_UNIT, M_TACH_CLK_DIV);
 726 }
 727
 728 static void aspeed_create_pwm_port(struct aspeed_pwm_tacho_data *priv,
 729                                    u8 pwm_port)
 730 {
 731         aspeed_set_pwm_port_enable(priv->regmap, pwm_port, true);
 732         priv->pwm_present[pwm_port] = true;
 733
 734         priv->pwm_port_type[pwm_port] = TYPEM;
 735         aspeed_set_pwm_port_type(priv->regmap, pwm_port, TYPEM);
 736
 737         priv->pwm_port_fan_ctrl[pwm_port] = INIT_FAN_CTRL;
 738         aspeed_set_pwm_port_fan_ctrl(priv, pwm_port, INIT_FAN_CTRL);
 739 }
 740
 741 static void aspeed_create_fan_tach_channel(struct aspeed_pwm_tacho_data *priv,
 742                                            u8 *fan_tach_ch,
 743                                            int count,
 744                                            u8 pwm_source)
 745 {
 746         u8 val, index;
 747
 748         for (val = 0; val < count; val++) {
 749                 index = fan_tach_ch[val];
 750                 aspeed_set_fan_tach_ch_enable(priv->regmap, index, true);
 751                 priv->fan_tach_present[index] = true;
 752                 priv->fan_tach_ch_source[index] = pwm_source;
 753                 aspeed_set_fan_tach_ch_source(priv->regmap, index, pwm_source);
 754         }
 755 }
 756
 757 static int
 758 aspeed_pwm_cz_get_max_state(struct thermal_cooling_device *tcdev,
 759                             unsigned long *state)
 760 {
 761         struct aspeed_cooling_device *cdev = tcdev->devdata;
 762
 763         *state = cdev->max_state;
 764
 765         return 0;
 766 }
 767
 768 static int
 769 aspeed_pwm_cz_get_cur_state(struct thermal_cooling_device *tcdev,
 770                             unsigned long *state)
 771 {
 772         struct aspeed_cooling_device *cdev = tcdev->devdata;
 773
 774         *state = cdev->cur_state;
 775
 776         return 0;
 777 }
 778
 779 static int
 780 aspeed_pwm_cz_set_cur_state(struct thermal_cooling_device *tcdev,
 781                             unsigned long state)
 782 {
 783         struct aspeed_cooling_device *cdev = tcdev->devdata;
 784
 785         if (state > cdev->max_state)
 786                 return -EINVAL;
 787
 788         cdev->cur_state = state;
 789         cdev->priv->pwm_port_fan_ctrl[cdev->pwm_port] =
 790                                         cdev->cooling_levels[cdev->cur_state];
 791         aspeed_set_pwm_port_fan_ctrl(cdev->priv, cdev->pwm_port,
 792                                      cdev->cooling_levels[cdev->cur_state]);
 793
 794         return 0;
 795 }
 796
 797 static const struct thermal_cooling_device_ops aspeed_pwm_cool_ops = {
 798         .get_max_state = aspeed_pwm_cz_get_max_state,
 799         .get_cur_state = aspeed_pwm_cz_get_cur_state,
 800         .set_cur_state = aspeed_pwm_cz_set_cur_state,
 801 };
 802
 803 static int aspeed_create_pwm_cooling(struct device *dev,
 804                                      struct device_node *child,
 805                                      struct aspeed_pwm_tacho_data *priv,
 806                                      u32 pwm_port, u8 num_levels)
 807 {
 808         int ret;
 809         struct aspeed_cooling_device *cdev;
 810
 811         cdev = devm_kzalloc(dev, sizeof(*cdev), GFP_KERNEL);
 812
 813         if (!cdev)
 814                 return -ENOMEM;
 815
 816         cdev->cooling_levels = devm_kzalloc(dev, num_levels, GFP_KERNEL);
 817         if (!cdev->cooling_levels)
 818                 return -ENOMEM;
 819
 820         cdev->max_state = num_levels - 1;
 821         ret = of_property_read_u8_array(child, "cooling-levels",
 822                                         cdev->cooling_levels,
 823                                         num_levels);
 824         if (ret) {
 825                 dev_err(dev, "Property 'cooling-levels' cannot be read.\n");
 826                 return ret;
 827         }
 828         snprintf(cdev->name, MAX_CDEV_NAME_LEN, "%pOFn%d", child, pwm_port);
 829
 830         cdev->tcdev = devm_thermal_of_cooling_device_register(dev, child,
 831                                         cdev->name, cdev, &aspeed_pwm_cool_ops);
 832         if (IS_ERR(cdev->tcdev))
 833                 return PTR_ERR(cdev->tcdev);
 834
 835         cdev->priv = priv;
 836         cdev->pwm_port = pwm_port;
 837
 838         priv->cdev[pwm_port] = cdev;
 839
 840         return 0;
 841 }
 842
 843 static int aspeed_create_fan(struct device *dev,
 844                              struct device_node *child,
 845                              struct aspeed_pwm_tacho_data *priv)
 846 {
 847         u8 *fan_tach_ch;
 848         u32 pwm_port;
 849         int ret, count;
 850
 851         ret = of_property_read_u32(child, "reg", &pwm_port);
 852         if (ret)
 853                 return ret;
 854         if (pwm_port >= ARRAY_SIZE(pwm_port_params))
 855                 return -EINVAL;
 856         aspeed_create_pwm_port(priv, (u8)pwm_port);
 857
 858         ret = of_property_count_u8_elems(child, "cooling-levels");
 859
 860         if (ret > 0) {
 861                 ret = aspeed_create_pwm_cooling(dev, child, priv, pwm_port,
 862                                                 ret);
 863                 if (ret)
 864                         return ret;
 865         }
 866
 867         count = of_property_count_u8_elems(child, "aspeed,fan-tach-ch");
 868         if (count < 1)
 869                 return -EINVAL;
 870         fan_tach_ch = devm_kcalloc(dev, count, sizeof(*fan_tach_ch),
 871                                    GFP_KERNEL);
 872         if (!fan_tach_ch)
 873                 return -ENOMEM;
 874         ret = of_property_read_u8_array(child, "aspeed,fan-tach-ch",
 875                                         fan_tach_ch, count);
 876         if (ret)
 877                 return ret;
 878         aspeed_create_fan_tach_channel(priv, fan_tach_ch, count, pwm_port);
 879
 880         return 0;
 881 }
 882
 883 static void aspeed_pwm_tacho_remove(void *data)
 884 {
 885         struct aspeed_pwm_tacho_data *priv = data;
 886
 887         reset_control_assert(priv->rst);
 888 }
 889
 890 static int aspeed_pwm_tacho_probe(struct platform_device *pdev)
 891 {
 892         struct device *dev = &pdev->dev;
 893         struct device_node *np, *child;
 894         struct aspeed_pwm_tacho_data *priv;
 895         void __iomem *regs;
 896         struct device *hwmon;
 897         struct clk *clk;
 898         int ret;
 899
 900         np = dev->of_node;
 901         regs = devm_platform_ioremap_resource(pdev, 0);
 902         if (IS_ERR(regs))
 903                 return PTR_ERR(regs);
 904         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 905         if (!priv)
 906                 return -ENOMEM;
 907         priv->regmap = devm_regmap_init(dev, NULL, (__force void *)regs,
 908                         &aspeed_pwm_tacho_regmap_config);
 909         if (IS_ERR(priv->regmap))
 910                 return PTR_ERR(priv->regmap);
 911
 912         priv->rst = devm_reset_control_get_exclusive(dev, NULL);
 913         if (IS_ERR(priv->rst)) {
 914                 dev_err(dev,
 915                         "missing or invalid reset controller device tree entry");
 916                 return PTR_ERR(priv->rst);
 917         }
 918         reset_control_deassert(priv->rst);
 919
 920         ret = devm_add_action_or_reset(dev, aspeed_pwm_tacho_remove, priv);
 921         if (ret)
 922                 return ret;
 923
 924         regmap_write(priv->regmap, ASPEED_PTCR_TACH_SOURCE, 0);
 925         regmap_write(priv->regmap, ASPEED_PTCR_TACH_SOURCE_EXT, 0);
 926
 927         clk = devm_clk_get(dev, NULL);
 928         if (IS_ERR(clk))
 929                 return -ENODEV;
 930         priv->clk_freq = clk_get_rate(clk);
 931         aspeed_set_clock_enable(priv->regmap, true);
 932         aspeed_set_clock_source(priv->regmap, 0);
 933
 934         aspeed_create_type(priv);
 935
 936         for_each_child_of_node(np, child) {
 937                 ret = aspeed_create_fan(dev, child, priv);
 938                 if (ret) {
 939                         of_node_put(child);
 940                         return ret;
 941                 }
 942         }
 943
 944         priv->groups[0] = &pwm_dev_group;
 945         priv->groups[1] = &fan_dev_group;
 946         priv->groups[2] = NULL;
 947         hwmon = devm_hwmon_device_register_with_groups(dev,
 948                                                        "aspeed_pwm_tacho",
 949                                                        priv, priv->groups);
 950         return PTR_ERR_OR_ZERO(hwmon);
 951 }
 952
 953 static const struct of_device_id of_pwm_tacho_match_table[] = {
 954         { .compatible = "aspeed,ast2400-pwm-tacho", },
 955         { .compatible = "aspeed,ast2500-pwm-tacho", },
 956         {},
 957 };
 958 MODULE_DEVICE_TABLE(of, of_pwm_tacho_match_table);
 959
 960 static struct platform_driver aspeed_pwm_tacho_driver = {
 961         .probe          = aspeed_pwm_tacho_probe,
 962         .driver         = {
 963                 .name   = "aspeed_pwm_tacho",
 964                 .of_match_table = of_pwm_tacho_match_table,
 965         },
 966 };
 967
 968 module_platform_driver(aspeed_pwm_tacho_driver);
 969
 970 MODULE_AUTHOR("Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>");
 971 MODULE_DESCRIPTION("ASPEED PWM and Fan Tacho device driver");
 972 MODULE_LICENSE("GPL");