drivers/iio/adc/meson_saradc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Amlogic Meson Successive Approximation Register (SAR) A/D Converter
   4  *
   5  * Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
   6  */
   7
   8 #include <linux/bitfield.h>
   9 #include <linux/clk.h>
  10 #include <linux/clk-provider.h>
  11 #include <linux/delay.h>
  12 #include <linux/io.h>
  13 #include <linux/iio/iio.h>
  14 #include <linux/module.h>
  15 #include <linux/nvmem-consumer.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/of.h>
  18 #include <linux/of_irq.h>
  19 #include <linux/of_device.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/regmap.h>
  22 #include <linux/regulator/consumer.h>
  23 #include <linux/mfd/syscon.h>
  24
  25 #define MESON_SAR_ADC_REG0                                      0x00
  26         #define MESON_SAR_ADC_REG0_PANEL_DETECT                 BIT(31)
  27         #define MESON_SAR_ADC_REG0_BUSY_MASK                    GENMASK(30, 28)
  28         #define MESON_SAR_ADC_REG0_DELTA_BUSY                   BIT(30)
  29         #define MESON_SAR_ADC_REG0_AVG_BUSY                     BIT(29)
  30         #define MESON_SAR_ADC_REG0_SAMPLE_BUSY                  BIT(28)
  31         #define MESON_SAR_ADC_REG0_FIFO_FULL                    BIT(27)
  32         #define MESON_SAR_ADC_REG0_FIFO_EMPTY                   BIT(26)
  33         #define MESON_SAR_ADC_REG0_FIFO_COUNT_MASK              GENMASK(25, 21)
  34         #define MESON_SAR_ADC_REG0_ADC_BIAS_CTRL_MASK           GENMASK(20, 19)
  35         #define MESON_SAR_ADC_REG0_CURR_CHAN_ID_MASK            GENMASK(18, 16)
  36         #define MESON_SAR_ADC_REG0_ADC_TEMP_SEN_SEL             BIT(15)
  37         #define MESON_SAR_ADC_REG0_SAMPLING_STOP                BIT(14)
  38         #define MESON_SAR_ADC_REG0_CHAN_DELTA_EN_MASK           GENMASK(13, 12)
  39         #define MESON_SAR_ADC_REG0_DETECT_IRQ_POL               BIT(10)
  40         #define MESON_SAR_ADC_REG0_DETECT_IRQ_EN                BIT(9)
  41         #define MESON_SAR_ADC_REG0_FIFO_CNT_IRQ_MASK            GENMASK(8, 4)
  42         #define MESON_SAR_ADC_REG0_FIFO_IRQ_EN                  BIT(3)
  43         #define MESON_SAR_ADC_REG0_SAMPLING_START               BIT(2)
  44         #define MESON_SAR_ADC_REG0_CONTINUOUS_EN                BIT(1)
  45         #define MESON_SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE         BIT(0)
  46
  47 #define MESON_SAR_ADC_CHAN_LIST                                 0x04
  48         #define MESON_SAR_ADC_CHAN_LIST_MAX_INDEX_MASK          GENMASK(26, 24)
  49         #define MESON_SAR_ADC_CHAN_LIST_ENTRY_MASK(_chan)       \
  50                                         (GENMASK(2, 0) << ((_chan) * 3))
  51
  52 #define MESON_SAR_ADC_AVG_CNTL                                  0x08
  53         #define MESON_SAR_ADC_AVG_CNTL_AVG_MODE_SHIFT(_chan)    \
  54                                         (16 + ((_chan) * 2))
  55         #define MESON_SAR_ADC_AVG_CNTL_AVG_MODE_MASK(_chan)     \
  56                                         (GENMASK(17, 16) << ((_chan) * 2))
  57         #define MESON_SAR_ADC_AVG_CNTL_NUM_SAMPLES_SHIFT(_chan) \
  58                                         (0 + ((_chan) * 2))
  59         #define MESON_SAR_ADC_AVG_CNTL_NUM_SAMPLES_MASK(_chan)  \
  60                                         (GENMASK(1, 0) << ((_chan) * 2))
  61
  62 #define MESON_SAR_ADC_REG3                                      0x0c
  63         #define MESON_SAR_ADC_REG3_CNTL_USE_SC_DLY              BIT(31)
  64         #define MESON_SAR_ADC_REG3_CLK_EN                       BIT(30)
  65         #define MESON_SAR_ADC_REG3_BL30_INITIALIZED             BIT(28)
  66         #define MESON_SAR_ADC_REG3_CTRL_CONT_RING_COUNTER_EN    BIT(27)
  67         #define MESON_SAR_ADC_REG3_CTRL_SAMPLING_CLOCK_PHASE    BIT(26)
  68         #define MESON_SAR_ADC_REG3_CTRL_CHAN7_MUX_SEL_MASK      GENMASK(25, 23)
  69         #define MESON_SAR_ADC_REG3_DETECT_EN                    BIT(22)
  70         #define MESON_SAR_ADC_REG3_ADC_EN                       BIT(21)
  71         #define MESON_SAR_ADC_REG3_PANEL_DETECT_COUNT_MASK      GENMASK(20, 18)
  72         #define MESON_SAR_ADC_REG3_PANEL_DETECT_FILTER_TB_MASK  GENMASK(17, 16)
  73         #define MESON_SAR_ADC_REG3_ADC_CLK_DIV_SHIFT            10
  74         #define MESON_SAR_ADC_REG3_ADC_CLK_DIV_WIDTH            5
  75         #define MESON_SAR_ADC_REG3_BLOCK_DLY_SEL_MASK           GENMASK(9, 8)
  76         #define MESON_SAR_ADC_REG3_BLOCK_DLY_MASK               GENMASK(7, 0)
  77
  78 #define MESON_SAR_ADC_DELAY                                     0x10
  79         #define MESON_SAR_ADC_DELAY_INPUT_DLY_SEL_MASK          GENMASK(25, 24)
  80         #define MESON_SAR_ADC_DELAY_BL30_BUSY                   BIT(15)
  81         #define MESON_SAR_ADC_DELAY_KERNEL_BUSY                 BIT(14)
  82         #define MESON_SAR_ADC_DELAY_INPUT_DLY_CNT_MASK          GENMASK(23, 16)
  83         #define MESON_SAR_ADC_DELAY_SAMPLE_DLY_SEL_MASK         GENMASK(9, 8)
  84         #define MESON_SAR_ADC_DELAY_SAMPLE_DLY_CNT_MASK         GENMASK(7, 0)
  85
  86 #define MESON_SAR_ADC_LAST_RD                                   0x14
  87         #define MESON_SAR_ADC_LAST_RD_LAST_CHANNEL1_MASK        GENMASK(23, 16)
  88         #define MESON_SAR_ADC_LAST_RD_LAST_CHANNEL0_MASK        GENMASK(9, 0)
  89
  90 #define MESON_SAR_ADC_FIFO_RD                                   0x18
  91         #define MESON_SAR_ADC_FIFO_RD_CHAN_ID_MASK              GENMASK(14, 12)
  92         #define MESON_SAR_ADC_FIFO_RD_SAMPLE_VALUE_MASK         GENMASK(11, 0)
  93
  94 #define MESON_SAR_ADC_AUX_SW                                    0x1c
  95         #define MESON_SAR_ADC_AUX_SW_MUX_SEL_CHAN_SHIFT(_chan)  \
  96                                         (8 + (((_chan) - 2) * 3))
  97         #define MESON_SAR_ADC_AUX_SW_VREF_P_MUX                 BIT(6)
  98         #define MESON_SAR_ADC_AUX_SW_VREF_N_MUX                 BIT(5)
  99         #define MESON_SAR_ADC_AUX_SW_MODE_SEL                   BIT(4)
 100         #define MESON_SAR_ADC_AUX_SW_YP_DRIVE_SW                BIT(3)
 101         #define MESON_SAR_ADC_AUX_SW_XP_DRIVE_SW                BIT(2)
 102         #define MESON_SAR_ADC_AUX_SW_YM_DRIVE_SW                BIT(1)
 103         #define MESON_SAR_ADC_AUX_SW_XM_DRIVE_SW                BIT(0)
 104
 105 #define MESON_SAR_ADC_CHAN_10_SW                                0x20
 106         #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_MUX_SEL_MASK     GENMASK(25, 23)
 107         #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_VREF_P_MUX       BIT(22)
 108         #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_VREF_N_MUX       BIT(21)
 109         #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_MODE_SEL         BIT(20)
 110         #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_YP_DRIVE_SW      BIT(19)
 111         #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_XP_DRIVE_SW      BIT(18)
 112         #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_YM_DRIVE_SW      BIT(17)
 113         #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_XM_DRIVE_SW      BIT(16)
 114         #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_MUX_SEL_MASK     GENMASK(9, 7)
 115         #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_VREF_P_MUX       BIT(6)
 116         #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_VREF_N_MUX       BIT(5)
 117         #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_MODE_SEL         BIT(4)
 118         #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_YP_DRIVE_SW      BIT(3)
 119         #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_XP_DRIVE_SW      BIT(2)
 120         #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_YM_DRIVE_SW      BIT(1)
 121         #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_XM_DRIVE_SW      BIT(0)
 122
 123 #define MESON_SAR_ADC_DETECT_IDLE_SW                            0x24
 124         #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_SW_EN       BIT(26)
 125         #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_MUX_MASK    GENMASK(25, 23)
 126         #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_VREF_P_MUX  BIT(22)
 127         #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_VREF_N_MUX  BIT(21)
 128         #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_MODE_SEL    BIT(20)
 129         #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_YP_DRIVE_SW BIT(19)
 130         #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_XP_DRIVE_SW BIT(18)
 131         #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_YM_DRIVE_SW BIT(17)
 132         #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_XM_DRIVE_SW BIT(16)
 133         #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_MUX_SEL_MASK  GENMASK(9, 7)
 134         #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_VREF_P_MUX    BIT(6)
 135         #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_VREF_N_MUX    BIT(5)
 136         #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_MODE_SEL      BIT(4)
 137         #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_YP_DRIVE_SW   BIT(3)
 138         #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_XP_DRIVE_SW   BIT(2)
 139         #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_YM_DRIVE_SW   BIT(1)
 140         #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_XM_DRIVE_SW   BIT(0)
 141
 142 #define MESON_SAR_ADC_DELTA_10                                  0x28
 143         #define MESON_SAR_ADC_DELTA_10_TEMP_SEL                 BIT(27)
 144         #define MESON_SAR_ADC_DELTA_10_TS_REVE1                 BIT(26)
 145         #define MESON_SAR_ADC_DELTA_10_CHAN1_DELTA_VALUE_MASK   GENMASK(25, 16)
 146         #define MESON_SAR_ADC_DELTA_10_TS_REVE0                 BIT(15)
 147         #define MESON_SAR_ADC_DELTA_10_TS_C_MASK                GENMASK(14, 11)
 148         #define MESON_SAR_ADC_DELTA_10_TS_VBG_EN                BIT(10)
 149         #define MESON_SAR_ADC_DELTA_10_CHAN0_DELTA_VALUE_MASK   GENMASK(9, 0)
 150
 151 /*
 152  * NOTE: registers from here are undocumented (the vendor Linux kernel driver
 153  * and u-boot source served as reference). These only seem to be relevant on
 154  * GXBB and newer.
 155  */
 156 #define MESON_SAR_ADC_REG11                                     0x2c
 157         #define MESON_SAR_ADC_REG11_BANDGAP_EN                  BIT(13)
 158
 159 #define MESON_SAR_ADC_REG13                                     0x34
 160         #define MESON_SAR_ADC_REG13_12BIT_CALIBRATION_MASK      GENMASK(13, 8)
 161
 162 #define MESON_SAR_ADC_MAX_FIFO_SIZE                             32
 163 #define MESON_SAR_ADC_TIMEOUT                                   100 /* ms */
 164 #define MESON_SAR_ADC_VOLTAGE_AND_TEMP_CHANNEL                  6
 165 #define MESON_SAR_ADC_TEMP_OFFSET                               27
 166
 167 /* temperature sensor calibration information in eFuse */
 168 #define MESON_SAR_ADC_EFUSE_BYTES                               4
 169 #define MESON_SAR_ADC_EFUSE_BYTE3_UPPER_ADC_VAL                 GENMASK(6, 0)
 170 #define MESON_SAR_ADC_EFUSE_BYTE3_IS_CALIBRATED                 BIT(7)
 171
 172 #define MESON_HHI_DPLL_TOP_0                                    0x318
 173 #define MESON_HHI_DPLL_TOP_0_TSC_BIT4                           BIT(9)
 174
 175 /* for use with IIO_VAL_INT_PLUS_MICRO */
 176 #define MILLION                                                 1000000
 177
 178 #define MESON_SAR_ADC_CHAN(_chan) {                                     \
 179         .type = IIO_VOLTAGE,                                            \
 180         .indexed = 1,                                                   \
 181         .channel = _chan,                                               \
 182         .address = _chan,                                               \
 183         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |                  \
 184                                 BIT(IIO_CHAN_INFO_AVERAGE_RAW),         \
 185         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),           \
 186         .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_CALIBBIAS) |       \
 187                                 BIT(IIO_CHAN_INFO_CALIBSCALE),          \
 188         .datasheet_name = "SAR_ADC_CH"#_chan,                           \
 189 }
 190
 191 #define MESON_SAR_ADC_TEMP_CHAN(_chan) {                                \
 192         .type = IIO_TEMP,                                               \
 193         .channel = _chan,                                               \
 194         .address = MESON_SAR_ADC_VOLTAGE_AND_TEMP_CHANNEL,              \
 195         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |                  \
 196                                 BIT(IIO_CHAN_INFO_AVERAGE_RAW),         \
 197         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |         \
 198                                         BIT(IIO_CHAN_INFO_SCALE),       \
 199         .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_CALIBBIAS) |       \
 200                                 BIT(IIO_CHAN_INFO_CALIBSCALE),          \
 201         .datasheet_name = "TEMP_SENSOR",                                \
 202 }
 203
 204 static const struct iio_chan_spec meson_sar_adc_iio_channels[] = {
 205         MESON_SAR_ADC_CHAN(0),
 206         MESON_SAR_ADC_CHAN(1),
 207         MESON_SAR_ADC_CHAN(2),
 208         MESON_SAR_ADC_CHAN(3),
 209         MESON_SAR_ADC_CHAN(4),
 210         MESON_SAR_ADC_CHAN(5),
 211         MESON_SAR_ADC_CHAN(6),
 212         MESON_SAR_ADC_CHAN(7),
 213         IIO_CHAN_SOFT_TIMESTAMP(8),
 214 };
 215
 216 static const struct iio_chan_spec meson_sar_adc_and_temp_iio_channels[] = {
 217         MESON_SAR_ADC_CHAN(0),
 218         MESON_SAR_ADC_CHAN(1),
 219         MESON_SAR_ADC_CHAN(2),
 220         MESON_SAR_ADC_CHAN(3),
 221         MESON_SAR_ADC_CHAN(4),
 222         MESON_SAR_ADC_CHAN(5),
 223         MESON_SAR_ADC_CHAN(6),
 224         MESON_SAR_ADC_CHAN(7),
 225         MESON_SAR_ADC_TEMP_CHAN(8),
 226         IIO_CHAN_SOFT_TIMESTAMP(9),
 227 };
 228
 229 enum meson_sar_adc_avg_mode {
 230         NO_AVERAGING = 0x0,
 231         MEAN_AVERAGING = 0x1,
 232         MEDIAN_AVERAGING = 0x2,
 233 };
 234
 235 enum meson_sar_adc_num_samples {
 236         ONE_SAMPLE = 0x0,
 237         TWO_SAMPLES = 0x1,
 238         FOUR_SAMPLES = 0x2,
 239         EIGHT_SAMPLES = 0x3,
 240 };
 241
 242 enum meson_sar_adc_chan7_mux_sel {
 243         CHAN7_MUX_VSS = 0x0,
 244         CHAN7_MUX_VDD_DIV4 = 0x1,
 245         CHAN7_MUX_VDD_DIV2 = 0x2,
 246         CHAN7_MUX_VDD_MUL3_DIV4 = 0x3,
 247         CHAN7_MUX_VDD = 0x4,
 248         CHAN7_MUX_CH7_INPUT = 0x7,
 249 };
 250
 251 struct meson_sar_adc_param {
 252         bool                                    has_bl30_integration;
 253         unsigned long                           clock_rate;
 254         u32                                     bandgap_reg;
 255         unsigned int                            resolution;
 256         const struct regmap_config              *regmap_config;
 257         u8                                      temperature_trimming_bits;
 258         unsigned int                            temperature_multiplier;
 259         unsigned int                            temperature_divider;
 260 };
 261
 262 struct meson_sar_adc_data {
 263         const struct meson_sar_adc_param        *param;
 264         const char                              *name;
 265 };
 266
 267 struct meson_sar_adc_priv {
 268         struct regmap                           *regmap;
 269         struct regulator                        *vref;
 270         const struct meson_sar_adc_param        *param;
 271         struct clk                              *clkin;
 272         struct clk                              *core_clk;
 273         struct clk                              *adc_sel_clk;
 274         struct clk                              *adc_clk;
 275         struct clk_gate                         clk_gate;
 276         struct clk                              *adc_div_clk;
 277         struct clk_divider                      clk_div;
 278         struct completion                       done;
 279         int                                     calibbias;
 280         int                                     calibscale;
 281         struct regmap                           *tsc_regmap;
 282         bool                                    temperature_sensor_calibrated;
 283         u8                                      temperature_sensor_coefficient;
 284         u16                                     temperature_sensor_adc_val;
 285 };
 286
 287 static const struct regmap_config meson_sar_adc_regmap_config_gxbb = {
 288         .reg_bits = 8,
 289         .val_bits = 32,
 290         .reg_stride = 4,
 291         .max_register = MESON_SAR_ADC_REG13,
 292 };
 293
 294 static const struct regmap_config meson_sar_adc_regmap_config_meson8 = {
 295         .reg_bits = 8,
 296         .val_bits = 32,
 297         .reg_stride = 4,
 298         .max_register = MESON_SAR_ADC_DELTA_10,
 299 };
 300
 301 static unsigned int meson_sar_adc_get_fifo_count(struct iio_dev *indio_dev)
 302 {
 303         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 304         u32 regval;
 305
 306         regmap_read(priv->regmap, MESON_SAR_ADC_REG0, &regval);
 307
 308         return FIELD_GET(MESON_SAR_ADC_REG0_FIFO_COUNT_MASK, regval);
 309 }
 310
 311 static int meson_sar_adc_calib_val(struct iio_dev *indio_dev, int val)
 312 {
 313         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 314         int tmp;
 315
 316         /* use val_calib = scale * val_raw + offset calibration function */
 317         tmp = div_s64((s64)val * priv->calibscale, MILLION) + priv->calibbias;
 318
 319         return clamp(tmp, 0, (1 << priv->param->resolution) - 1);
 320 }
 321
 322 static int meson_sar_adc_wait_busy_clear(struct iio_dev *indio_dev)
 323 {
 324         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 325         int regval, timeout = 10000;
 326
 327         /*
 328          * NOTE: we need a small delay before reading the status, otherwise
 329          * the sample engine may not have started internally (which would
 330          * seem to us that sampling is already finished).
 331          */
 332         do {
 333                 udelay(1);
 334                 regmap_read(priv->regmap, MESON_SAR_ADC_REG0, &regval);
 335         } while (FIELD_GET(MESON_SAR_ADC_REG0_BUSY_MASK, regval) && timeout--);
 336
 337         if (timeout < 0)
 338                 return -ETIMEDOUT;
 339
 340         return 0;
 341 }
 342
 343 static int meson_sar_adc_read_raw_sample(struct iio_dev *indio_dev,
 344                                          const struct iio_chan_spec *chan,
 345                                          int *val)
 346 {
 347         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 348         int regval, fifo_chan, fifo_val, count;
 349
 350         if (!wait_for_completion_timeout(&priv->done,
 351                                 msecs_to_jiffies(MESON_SAR_ADC_TIMEOUT)))
 352                 return -ETIMEDOUT;
 353
 354         count = meson_sar_adc_get_fifo_count(indio_dev);
 355         if (count != 1) {
 356                 dev_err(&indio_dev->dev,
 357                         "ADC FIFO has %d element(s) instead of one\n", count);
 358                 return -EINVAL;
 359         }
 360
 361         regmap_read(priv->regmap, MESON_SAR_ADC_FIFO_RD, &regval);
 362         fifo_chan = FIELD_GET(MESON_SAR_ADC_FIFO_RD_CHAN_ID_MASK, regval);
 363         if (fifo_chan != chan->address) {
 364                 dev_err(&indio_dev->dev,
 365                         "ADC FIFO entry belongs to channel %d instead of %lu\n",
 366                         fifo_chan, chan->address);
 367                 return -EINVAL;
 368         }
 369
 370         fifo_val = FIELD_GET(MESON_SAR_ADC_FIFO_RD_SAMPLE_VALUE_MASK, regval);
 371         fifo_val &= GENMASK(priv->param->resolution - 1, 0);
 372         *val = meson_sar_adc_calib_val(indio_dev, fifo_val);
 373
 374         return 0;
 375 }
 376
 377 static void meson_sar_adc_set_averaging(struct iio_dev *indio_dev,
 378                                         const struct iio_chan_spec *chan,
 379                                         enum meson_sar_adc_avg_mode mode,
 380                                         enum meson_sar_adc_num_samples samples)
 381 {
 382         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 383         int val, address = chan->address;
 384
 385         val = samples << MESON_SAR_ADC_AVG_CNTL_NUM_SAMPLES_SHIFT(address);
 386         regmap_update_bits(priv->regmap, MESON_SAR_ADC_AVG_CNTL,
 387                            MESON_SAR_ADC_AVG_CNTL_NUM_SAMPLES_MASK(address),
 388                            val);
 389
 390         val = mode << MESON_SAR_ADC_AVG_CNTL_AVG_MODE_SHIFT(address);
 391         regmap_update_bits(priv->regmap, MESON_SAR_ADC_AVG_CNTL,
 392                            MESON_SAR_ADC_AVG_CNTL_AVG_MODE_MASK(address), val);
 393 }
 394
 395 static void meson_sar_adc_enable_channel(struct iio_dev *indio_dev,
 396                                         const struct iio_chan_spec *chan)
 397 {
 398         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 399         u32 regval;
 400
 401         /*
 402          * the SAR ADC engine allows sampling multiple channels at the same
 403          * time. to keep it simple we're only working with one *internal*
 404          * channel, which starts counting at index 0 (which means: count = 1).
 405          */
 406         regval = FIELD_PREP(MESON_SAR_ADC_CHAN_LIST_MAX_INDEX_MASK, 0);
 407         regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_LIST,
 408                            MESON_SAR_ADC_CHAN_LIST_MAX_INDEX_MASK, regval);
 409
 410         /* map channel index 0 to the channel which we want to read */
 411         regval = FIELD_PREP(MESON_SAR_ADC_CHAN_LIST_ENTRY_MASK(0),
 412                             chan->address);
 413         regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_LIST,
 414                            MESON_SAR_ADC_CHAN_LIST_ENTRY_MASK(0), regval);
 415
 416         regval = FIELD_PREP(MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_MUX_MASK,
 417                             chan->address);
 418         regmap_update_bits(priv->regmap, MESON_SAR_ADC_DETECT_IDLE_SW,
 419                            MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_MUX_MASK,
 420                            regval);
 421
 422         regval = FIELD_PREP(MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_MUX_SEL_MASK,
 423                             chan->address);
 424         regmap_update_bits(priv->regmap, MESON_SAR_ADC_DETECT_IDLE_SW,
 425                            MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_MUX_SEL_MASK,
 426                            regval);
 427
 428         if (chan->address == MESON_SAR_ADC_VOLTAGE_AND_TEMP_CHANNEL) {
 429                 if (chan->type == IIO_TEMP)
 430                         regval = MESON_SAR_ADC_DELTA_10_TEMP_SEL;
 431                 else
 432                         regval = 0;
 433
 434                 regmap_update_bits(priv->regmap,
 435                                    MESON_SAR_ADC_DELTA_10,
 436                                    MESON_SAR_ADC_DELTA_10_TEMP_SEL, regval);
 437         }
 438 }
 439
 440 static void meson_sar_adc_set_chan7_mux(struct iio_dev *indio_dev,
 441                                         enum meson_sar_adc_chan7_mux_sel sel)
 442 {
 443         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 444         u32 regval;
 445
 446         regval = FIELD_PREP(MESON_SAR_ADC_REG3_CTRL_CHAN7_MUX_SEL_MASK, sel);
 447         regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3,
 448                            MESON_SAR_ADC_REG3_CTRL_CHAN7_MUX_SEL_MASK, regval);
 449
 450         usleep_range(10, 20);
 451 }
 452
 453 static void meson_sar_adc_start_sample_engine(struct iio_dev *indio_dev)
 454 {
 455         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 456
 457         reinit_completion(&priv->done);
 458
 459         regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
 460                            MESON_SAR_ADC_REG0_FIFO_IRQ_EN,
 461                            MESON_SAR_ADC_REG0_FIFO_IRQ_EN);
 462
 463         regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
 464                            MESON_SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE,
 465                            MESON_SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE);
 466
 467         regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
 468                            MESON_SAR_ADC_REG0_SAMPLING_START,
 469                            MESON_SAR_ADC_REG0_SAMPLING_START);
 470 }
 471
 472 static void meson_sar_adc_stop_sample_engine(struct iio_dev *indio_dev)
 473 {
 474         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 475
 476         regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
 477                            MESON_SAR_ADC_REG0_FIFO_IRQ_EN, 0);
 478
 479         regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
 480                            MESON_SAR_ADC_REG0_SAMPLING_STOP,
 481                            MESON_SAR_ADC_REG0_SAMPLING_STOP);
 482
 483         /* wait until all modules are stopped */
 484         meson_sar_adc_wait_busy_clear(indio_dev);
 485
 486         regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
 487                            MESON_SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE, 0);
 488 }
 489
 490 static int meson_sar_adc_lock(struct iio_dev *indio_dev)
 491 {
 492         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 493         int val, timeout = 10000;
 494
 495         mutex_lock(&indio_dev->mlock);
 496
 497         if (priv->param->has_bl30_integration) {
 498                 /* prevent BL30 from using the SAR ADC while we are using it */
 499                 regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY,
 500                                    MESON_SAR_ADC_DELAY_KERNEL_BUSY,
 501                                    MESON_SAR_ADC_DELAY_KERNEL_BUSY);
 502
 503                 /*
 504                  * wait until BL30 releases it's lock (so we can use the SAR
 505                  * ADC)
 506                  */
 507                 do {
 508                         udelay(1);
 509                         regmap_read(priv->regmap, MESON_SAR_ADC_DELAY, &val);
 510                 } while (val & MESON_SAR_ADC_DELAY_BL30_BUSY && timeout--);
 511
 512                 if (timeout < 0) {
 513                         mutex_unlock(&indio_dev->mlock);
 514                         return -ETIMEDOUT;
 515                 }
 516         }
 517
 518         return 0;
 519 }
 520
 521 static void meson_sar_adc_unlock(struct iio_dev *indio_dev)
 522 {
 523         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 524
 525         if (priv->param->has_bl30_integration)
 526                 /* allow BL30 to use the SAR ADC again */
 527                 regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY,
 528                                    MESON_SAR_ADC_DELAY_KERNEL_BUSY, 0);
 529
 530         mutex_unlock(&indio_dev->mlock);
 531 }
 532
 533 static void meson_sar_adc_clear_fifo(struct iio_dev *indio_dev)
 534 {
 535         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 536         unsigned int count, tmp;
 537
 538         for (count = 0; count < MESON_SAR_ADC_MAX_FIFO_SIZE; count++) {
 539                 if (!meson_sar_adc_get_fifo_count(indio_dev))
 540                         break;
 541
 542                 regmap_read(priv->regmap, MESON_SAR_ADC_FIFO_RD, &tmp);
 543         }
 544 }
 545
 546 static int meson_sar_adc_get_sample(struct iio_dev *indio_dev,
 547                                     const struct iio_chan_spec *chan,
 548                                     enum meson_sar_adc_avg_mode avg_mode,
 549                                     enum meson_sar_adc_num_samples avg_samples,
 550                                     int *val)
 551 {
 552         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 553         int ret;
 554
 555         if (chan->type == IIO_TEMP && !priv->temperature_sensor_calibrated)
 556                 return -ENOTSUPP;
 557
 558         ret = meson_sar_adc_lock(indio_dev);
 559         if (ret)
 560                 return ret;
 561
 562         /* clear the FIFO to make sure we're not reading old values */
 563         meson_sar_adc_clear_fifo(indio_dev);
 564
 565         meson_sar_adc_set_averaging(indio_dev, chan, avg_mode, avg_samples);
 566
 567         meson_sar_adc_enable_channel(indio_dev, chan);
 568
 569         meson_sar_adc_start_sample_engine(indio_dev);
 570         ret = meson_sar_adc_read_raw_sample(indio_dev, chan, val);
 571         meson_sar_adc_stop_sample_engine(indio_dev);
 572
 573         meson_sar_adc_unlock(indio_dev);
 574
 575         if (ret) {
 576                 dev_warn(indio_dev->dev.parent,
 577                          "failed to read sample for channel %lu: %d\n",
 578                          chan->address, ret);
 579                 return ret;
 580         }
 581
 582         return IIO_VAL_INT;
 583 }
 584
 585 static int meson_sar_adc_iio_info_read_raw(struct iio_dev *indio_dev,
 586                                            const struct iio_chan_spec *chan,
 587                                            int *val, int *val2, long mask)
 588 {
 589         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 590         int ret;
 591
 592         switch (mask) {
 593         case IIO_CHAN_INFO_RAW:
 594                 return meson_sar_adc_get_sample(indio_dev, chan, NO_AVERAGING,
 595                                                 ONE_SAMPLE, val);
 596
 597         case IIO_CHAN_INFO_AVERAGE_RAW:
 598                 return meson_sar_adc_get_sample(indio_dev, chan,
 599                                                 MEAN_AVERAGING, EIGHT_SAMPLES,
 600                                                 val);
 601
 602         case IIO_CHAN_INFO_SCALE:
 603                 if (chan->type == IIO_VOLTAGE) {
 604                         ret = regulator_get_voltage(priv->vref);
 605                         if (ret < 0) {
 606                                 dev_err(indio_dev->dev.parent,
 607                                         "failed to get vref voltage: %d\n",
 608                                         ret);
 609                                 return ret;
 610                         }
 611
 612                         *val = ret / 1000;
 613                         *val2 = priv->param->resolution;
 614                         return IIO_VAL_FRACTIONAL_LOG2;
 615                 } else if (chan->type == IIO_TEMP) {
 616                         /* SoC specific multiplier and divider */
 617                         *val = priv->param->temperature_multiplier;
 618                         *val2 = priv->param->temperature_divider;
 619
 620                         /* celsius to millicelsius */
 621                         *val *= 1000;
 622
 623                         return IIO_VAL_FRACTIONAL;
 624                 } else {
 625                         return -EINVAL;
 626                 }
 627
 628         case IIO_CHAN_INFO_CALIBBIAS:
 629                 *val = priv->calibbias;
 630                 return IIO_VAL_INT;
 631
 632         case IIO_CHAN_INFO_CALIBSCALE:
 633                 *val = priv->calibscale / MILLION;
 634                 *val2 = priv->calibscale % MILLION;
 635                 return IIO_VAL_INT_PLUS_MICRO;
 636
 637         case IIO_CHAN_INFO_OFFSET:
 638                 *val = DIV_ROUND_CLOSEST(MESON_SAR_ADC_TEMP_OFFSET *
 639                                          priv->param->temperature_divider,
 640                                          priv->param->temperature_multiplier);
 641                 *val -= priv->temperature_sensor_adc_val;
 642                 return IIO_VAL_INT;
 643
 644         default:
 645                 return -EINVAL;
 646         }
 647 }
 648
 649 static int meson_sar_adc_clk_init(struct iio_dev *indio_dev,
 650                                   void __iomem *base)
 651 {
 652         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 653         struct clk_init_data init;
 654         const char *clk_parents[1];
 655
 656         init.name = devm_kasprintf(&indio_dev->dev, GFP_KERNEL, "%s#adc_div",
 657                                    dev_name(indio_dev->dev.parent));
 658         if (!init.name)
 659                 return -ENOMEM;
 660
 661         init.flags = 0;
 662         init.ops = &clk_divider_ops;
 663         clk_parents[0] = __clk_get_name(priv->clkin);
 664         init.parent_names = clk_parents;
 665         init.num_parents = 1;
 666
 667         priv->clk_div.reg = base + MESON_SAR_ADC_REG3;
 668         priv->clk_div.shift = MESON_SAR_ADC_REG3_ADC_CLK_DIV_SHIFT;
 669         priv->clk_div.width = MESON_SAR_ADC_REG3_ADC_CLK_DIV_WIDTH;
 670         priv->clk_div.hw.init = &init;
 671         priv->clk_div.flags = 0;
 672
 673         priv->adc_div_clk = devm_clk_register(&indio_dev->dev,
 674                                               &priv->clk_div.hw);
 675         if (WARN_ON(IS_ERR(priv->adc_div_clk)))
 676                 return PTR_ERR(priv->adc_div_clk);
 677
 678         init.name = devm_kasprintf(&indio_dev->dev, GFP_KERNEL, "%s#adc_en",
 679                                    dev_name(indio_dev->dev.parent));
 680         if (!init.name)
 681                 return -ENOMEM;
 682
 683         init.flags = CLK_SET_RATE_PARENT;
 684         init.ops = &clk_gate_ops;
 685         clk_parents[0] = __clk_get_name(priv->adc_div_clk);
 686         init.parent_names = clk_parents;
 687         init.num_parents = 1;
 688
 689         priv->clk_gate.reg = base + MESON_SAR_ADC_REG3;
 690         priv->clk_gate.bit_idx = __ffs(MESON_SAR_ADC_REG3_CLK_EN);
 691         priv->clk_gate.hw.init = &init;
 692
 693         priv->adc_clk = devm_clk_register(&indio_dev->dev, &priv->clk_gate.hw);
 694         if (WARN_ON(IS_ERR(priv->adc_clk)))
 695                 return PTR_ERR(priv->adc_clk);
 696
 697         return 0;
 698 }
 699
 700 static int meson_sar_adc_temp_sensor_init(struct iio_dev *indio_dev)
 701 {
 702         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 703         u8 *buf, trimming_bits, trimming_mask, upper_adc_val;
 704         struct nvmem_cell *temperature_calib;
 705         size_t read_len;
 706         int ret;
 707
 708         temperature_calib = devm_nvmem_cell_get(indio_dev->dev.parent,
 709                                                 "temperature_calib");
 710         if (IS_ERR(temperature_calib)) {
 711                 ret = PTR_ERR(temperature_calib);
 712
 713                 /*
 714                  * leave the temperature sensor disabled if no calibration data
 715                  * was passed via nvmem-cells.
 716                  */
 717                 if (ret == -ENODEV)
 718                         return 0;
 719
 720                 return dev_err_probe(indio_dev->dev.parent, ret,
 721                                      "failed to get temperature_calib cell\n");
 722         }
 723
 724         priv->tsc_regmap =
 725                 syscon_regmap_lookup_by_phandle(indio_dev->dev.parent->of_node,
 726                                                 "amlogic,hhi-sysctrl");
 727         if (IS_ERR(priv->tsc_regmap)) {
 728                 dev_err(indio_dev->dev.parent,
 729                         "failed to get amlogic,hhi-sysctrl regmap\n");
 730                 return PTR_ERR(priv->tsc_regmap);
 731         }
 732
 733         read_len = MESON_SAR_ADC_EFUSE_BYTES;
 734         buf = nvmem_cell_read(temperature_calib, &read_len);
 735         if (IS_ERR(buf)) {
 736                 dev_err(indio_dev->dev.parent,
 737                         "failed to read temperature_calib cell\n");
 738                 return PTR_ERR(buf);
 739         } else if (read_len != MESON_SAR_ADC_EFUSE_BYTES) {
 740                 kfree(buf);
 741                 dev_err(indio_dev->dev.parent,
 742                         "invalid read size of temperature_calib cell\n");
 743                 return -EINVAL;
 744         }
 745
 746         trimming_bits = priv->param->temperature_trimming_bits;
 747         trimming_mask = BIT(trimming_bits) - 1;
 748
 749         priv->temperature_sensor_calibrated =
 750                 buf[3] & MESON_SAR_ADC_EFUSE_BYTE3_IS_CALIBRATED;
 751         priv->temperature_sensor_coefficient = buf[2] & trimming_mask;
 752
 753         upper_adc_val = FIELD_GET(MESON_SAR_ADC_EFUSE_BYTE3_UPPER_ADC_VAL,
 754                                   buf[3]);
 755
 756         priv->temperature_sensor_adc_val = buf[2];
 757         priv->temperature_sensor_adc_val |= upper_adc_val << BITS_PER_BYTE;
 758         priv->temperature_sensor_adc_val >>= trimming_bits;
 759
 760         kfree(buf);
 761
 762         return 0;
 763 }
 764
 765 static int meson_sar_adc_init(struct iio_dev *indio_dev)
 766 {
 767         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 768         int regval, i, ret;
 769
 770         /*
 771          * make sure we start at CH7 input since the other muxes are only used
 772          * for internal calibration.
 773          */
 774         meson_sar_adc_set_chan7_mux(indio_dev, CHAN7_MUX_CH7_INPUT);
 775
 776         if (priv->param->has_bl30_integration) {
 777                 /*
 778                  * leave sampling delay and the input clocks as configured by
 779                  * BL30 to make sure BL30 gets the values it expects when
 780                  * reading the temperature sensor.
 781                  */
 782                 regmap_read(priv->regmap, MESON_SAR_ADC_REG3, &regval);
 783                 if (regval & MESON_SAR_ADC_REG3_BL30_INITIALIZED)
 784                         return 0;
 785         }
 786
 787         meson_sar_adc_stop_sample_engine(indio_dev);
 788
 789         /*
 790          * disable this bit as seems to be only relevant for Meson6 (based
 791          * on the vendor driver), which we don't support at the moment.
 792          */
 793         regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
 794                            MESON_SAR_ADC_REG0_ADC_TEMP_SEN_SEL, 0);
 795
 796         /* disable all channels by default */
 797         regmap_write(priv->regmap, MESON_SAR_ADC_CHAN_LIST, 0x0);
 798
 799         regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3,
 800                            MESON_SAR_ADC_REG3_CTRL_SAMPLING_CLOCK_PHASE, 0);
 801         regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3,
 802                            MESON_SAR_ADC_REG3_CNTL_USE_SC_DLY,
 803                            MESON_SAR_ADC_REG3_CNTL_USE_SC_DLY);
 804
 805         /* delay between two samples = (10+1) * 1uS */
 806         regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY,
 807                            MESON_SAR_ADC_DELAY_INPUT_DLY_CNT_MASK,
 808                            FIELD_PREP(MESON_SAR_ADC_DELAY_SAMPLE_DLY_CNT_MASK,
 809                                       10));
 810         regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY,
 811                            MESON_SAR_ADC_DELAY_SAMPLE_DLY_SEL_MASK,
 812                            FIELD_PREP(MESON_SAR_ADC_DELAY_SAMPLE_DLY_SEL_MASK,
 813                                       0));
 814
 815         /* delay between two samples = (10+1) * 1uS */
 816         regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY,
 817                            MESON_SAR_ADC_DELAY_INPUT_DLY_CNT_MASK,
 818                            FIELD_PREP(MESON_SAR_ADC_DELAY_INPUT_DLY_CNT_MASK,
 819                                       10));
 820         regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY,
 821                            MESON_SAR_ADC_DELAY_INPUT_DLY_SEL_MASK,
 822                            FIELD_PREP(MESON_SAR_ADC_DELAY_INPUT_DLY_SEL_MASK,
 823                                       1));
 824
 825         /*
 826          * set up the input channel muxes in MESON_SAR_ADC_CHAN_10_SW
 827          * (0 = SAR_ADC_CH0, 1 = SAR_ADC_CH1)
 828          */
 829         regval = FIELD_PREP(MESON_SAR_ADC_CHAN_10_SW_CHAN0_MUX_SEL_MASK, 0);
 830         regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_10_SW,
 831                            MESON_SAR_ADC_CHAN_10_SW_CHAN0_MUX_SEL_MASK,
 832                            regval);
 833         regval = FIELD_PREP(MESON_SAR_ADC_CHAN_10_SW_CHAN1_MUX_SEL_MASK, 1);
 834         regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_10_SW,
 835                            MESON_SAR_ADC_CHAN_10_SW_CHAN1_MUX_SEL_MASK,
 836                            regval);
 837
 838         /*
 839          * set up the input channel muxes in MESON_SAR_ADC_AUX_SW
 840          * (2 = SAR_ADC_CH2, 3 = SAR_ADC_CH3, ...) and enable
 841          * MESON_SAR_ADC_AUX_SW_YP_DRIVE_SW and
 842          * MESON_SAR_ADC_AUX_SW_XP_DRIVE_SW like the vendor driver.
 843          */
 844         regval = 0;
 845         for (i = 2; i <= 7; i++)
 846                 regval |= i << MESON_SAR_ADC_AUX_SW_MUX_SEL_CHAN_SHIFT(i);
 847         regval |= MESON_SAR_ADC_AUX_SW_YP_DRIVE_SW;
 848         regval |= MESON_SAR_ADC_AUX_SW_XP_DRIVE_SW;
 849         regmap_write(priv->regmap, MESON_SAR_ADC_AUX_SW, regval);
 850
 851         if (priv->temperature_sensor_calibrated) {
 852                 regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELTA_10,
 853                                    MESON_SAR_ADC_DELTA_10_TS_REVE1,
 854                                    MESON_SAR_ADC_DELTA_10_TS_REVE1);
 855                 regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELTA_10,
 856                                    MESON_SAR_ADC_DELTA_10_TS_REVE0,
 857                                    MESON_SAR_ADC_DELTA_10_TS_REVE0);
 858
 859                 /*
 860                  * set bits [3:0] of the TSC (temperature sensor coefficient)
 861                  * to get the correct values when reading the temperature.
 862                  */
 863                 regval = FIELD_PREP(MESON_SAR_ADC_DELTA_10_TS_C_MASK,
 864                                     priv->temperature_sensor_coefficient);
 865                 regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELTA_10,
 866                                    MESON_SAR_ADC_DELTA_10_TS_C_MASK, regval);
 867
 868                 if (priv->param->temperature_trimming_bits == 5) {
 869                         if (priv->temperature_sensor_coefficient & BIT(4))
 870                                 regval = MESON_HHI_DPLL_TOP_0_TSC_BIT4;
 871                         else
 872                                 regval = 0;
 873
 874                         /*
 875                          * bit [4] (the 5th bit when starting to count at 1)
 876                          * of the TSC is located in the HHI register area.
 877                          */
 878                         regmap_update_bits(priv->tsc_regmap,
 879                                            MESON_HHI_DPLL_TOP_0,
 880                                            MESON_HHI_DPLL_TOP_0_TSC_BIT4,
 881                                            regval);
 882                 }
 883         } else {
 884                 regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELTA_10,
 885                                    MESON_SAR_ADC_DELTA_10_TS_REVE1, 0);
 886                 regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELTA_10,
 887                                    MESON_SAR_ADC_DELTA_10_TS_REVE0, 0);
 888         }
 889
 890         ret = clk_set_parent(priv->adc_sel_clk, priv->clkin);
 891         if (ret) {
 892                 dev_err(indio_dev->dev.parent,
 893                         "failed to set adc parent to clkin\n");
 894                 return ret;
 895         }
 896
 897         ret = clk_set_rate(priv->adc_clk, priv->param->clock_rate);
 898         if (ret) {
 899                 dev_err(indio_dev->dev.parent,
 900                         "failed to set adc clock rate\n");
 901                 return ret;
 902         }
 903
 904         return 0;
 905 }
 906
 907 static void meson_sar_adc_set_bandgap(struct iio_dev *indio_dev, bool on_off)
 908 {
 909         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 910         const struct meson_sar_adc_param *param = priv->param;
 911         u32 enable_mask;
 912
 913         if (param->bandgap_reg == MESON_SAR_ADC_REG11)
 914                 enable_mask = MESON_SAR_ADC_REG11_BANDGAP_EN;
 915         else
 916                 enable_mask = MESON_SAR_ADC_DELTA_10_TS_VBG_EN;
 917
 918         regmap_update_bits(priv->regmap, param->bandgap_reg, enable_mask,
 919                            on_off ? enable_mask : 0);
 920 }
 921
 922 static int meson_sar_adc_hw_enable(struct iio_dev *indio_dev)
 923 {
 924         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 925         int ret;
 926         u32 regval;
 927
 928         ret = meson_sar_adc_lock(indio_dev);
 929         if (ret)
 930                 goto err_lock;
 931
 932         ret = regulator_enable(priv->vref);
 933         if (ret < 0) {
 934                 dev_err(indio_dev->dev.parent,
 935                         "failed to enable vref regulator\n");
 936                 goto err_vref;
 937         }
 938
 939         ret = clk_prepare_enable(priv->core_clk);
 940         if (ret) {
 941                 dev_err(indio_dev->dev.parent, "failed to enable core clk\n");
 942                 goto err_core_clk;
 943         }
 944
 945         regval = FIELD_PREP(MESON_SAR_ADC_REG0_FIFO_CNT_IRQ_MASK, 1);
 946         regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
 947                            MESON_SAR_ADC_REG0_FIFO_CNT_IRQ_MASK, regval);
 948
 949         meson_sar_adc_set_bandgap(indio_dev, true);
 950
 951         regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3,
 952                            MESON_SAR_ADC_REG3_ADC_EN,
 953                            MESON_SAR_ADC_REG3_ADC_EN);
 954
 955         udelay(5);
 956
 957         ret = clk_prepare_enable(priv->adc_clk);
 958         if (ret) {
 959                 dev_err(indio_dev->dev.parent, "failed to enable adc clk\n");
 960                 goto err_adc_clk;
 961         }
 962
 963         meson_sar_adc_unlock(indio_dev);
 964
 965         return 0;
 966
 967 err_adc_clk:
 968         regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3,
 969                            MESON_SAR_ADC_REG3_ADC_EN, 0);
 970         meson_sar_adc_set_bandgap(indio_dev, false);
 971         clk_disable_unprepare(priv->core_clk);
 972 err_core_clk:
 973         regulator_disable(priv->vref);
 974 err_vref:
 975         meson_sar_adc_unlock(indio_dev);
 976 err_lock:
 977         return ret;
 978 }
 979
 980 static int meson_sar_adc_hw_disable(struct iio_dev *indio_dev)
 981 {
 982         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 983         int ret;
 984
 985         ret = meson_sar_adc_lock(indio_dev);
 986         if (ret)
 987                 return ret;
 988
 989         clk_disable_unprepare(priv->adc_clk);
 990
 991         regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3,
 992                            MESON_SAR_ADC_REG3_ADC_EN, 0);
 993
 994         meson_sar_adc_set_bandgap(indio_dev, false);
 995
 996         clk_disable_unprepare(priv->core_clk);
 997
 998         regulator_disable(priv->vref);
 999
1000         meson_sar_adc_unlock(indio_dev);
1001
1002         return 0;
1003 }
1004
1005 static irqreturn_t meson_sar_adc_irq(int irq, void *data)
1006 {
1007         struct iio_dev *indio_dev = data;
1008         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
1009         unsigned int cnt, threshold;
1010         u32 regval;
1011
1012         regmap_read(priv->regmap, MESON_SAR_ADC_REG0, &regval);
1013         cnt = FIELD_GET(MESON_SAR_ADC_REG0_FIFO_COUNT_MASK, regval);
1014         threshold = FIELD_GET(MESON_SAR_ADC_REG0_FIFO_CNT_IRQ_MASK, regval);
1015
1016         if (cnt < threshold)
1017                 return IRQ_NONE;
1018
1019         complete(&priv->done);
1020
1021         return IRQ_HANDLED;
1022 }
1023
1024 static int meson_sar_adc_calib(struct iio_dev *indio_dev)
1025 {
1026         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
1027         int ret, nominal0, nominal1, value0, value1;
1028
1029         /* use points 25% and 75% for calibration */
1030         nominal0 = (1 << priv->param->resolution) / 4;
1031         nominal1 = (1 << priv->param->resolution) * 3 / 4;
1032
1033         meson_sar_adc_set_chan7_mux(indio_dev, CHAN7_MUX_VDD_DIV4);
1034         usleep_range(10, 20);
1035         ret = meson_sar_adc_get_sample(indio_dev,
1036                                        &indio_dev->channels[7],
1037                                        MEAN_AVERAGING, EIGHT_SAMPLES, &value0);
1038         if (ret < 0)
1039                 goto out;
1040
1041         meson_sar_adc_set_chan7_mux(indio_dev, CHAN7_MUX_VDD_MUL3_DIV4);
1042         usleep_range(10, 20);
1043         ret = meson_sar_adc_get_sample(indio_dev,
1044                                        &indio_dev->channels[7],
1045                                        MEAN_AVERAGING, EIGHT_SAMPLES, &value1);
1046         if (ret < 0)
1047                 goto out;
1048
1049         if (value1 <= value0) {
1050                 ret = -EINVAL;
1051                 goto out;
1052         }
1053
1054         priv->calibscale = div_s64((nominal1 - nominal0) * (s64)MILLION,
1055                                    value1 - value0);
1056         priv->calibbias = nominal0 - div_s64((s64)value0 * priv->calibscale,
1057                                              MILLION);
1058         ret = 0;
1059 out:
1060         meson_sar_adc_set_chan7_mux(indio_dev, CHAN7_MUX_CH7_INPUT);
1061
1062         return ret;
1063 }
1064
1065 static const struct iio_info meson_sar_adc_iio_info = {
1066         .read_raw = meson_sar_adc_iio_info_read_raw,
1067 };
1068
1069 static const struct meson_sar_adc_param meson_sar_adc_meson8_param = {
1070         .has_bl30_integration = false,
1071         .clock_rate = 1150000,
1072         .bandgap_reg = MESON_SAR_ADC_DELTA_10,
1073         .regmap_config = &meson_sar_adc_regmap_config_meson8,
1074         .resolution = 10,
1075         .temperature_trimming_bits = 4,
1076         .temperature_multiplier = 18 * 10000,
1077         .temperature_divider = 1024 * 10 * 85,
1078 };
1079
1080 static const struct meson_sar_adc_param meson_sar_adc_meson8b_param = {
1081         .has_bl30_integration = false,
1082         .clock_rate = 1150000,
1083         .bandgap_reg = MESON_SAR_ADC_DELTA_10,
1084         .regmap_config = &meson_sar_adc_regmap_config_meson8,
1085         .resolution = 10,
1086         .temperature_trimming_bits = 5,
1087         .temperature_multiplier = 10,
1088         .temperature_divider = 32,
1089 };
1090
1091 static const struct meson_sar_adc_param meson_sar_adc_gxbb_param = {
1092         .has_bl30_integration = true,
1093         .clock_rate = 1200000,
1094         .bandgap_reg = MESON_SAR_ADC_REG11,
1095         .regmap_config = &meson_sar_adc_regmap_config_gxbb,
1096         .resolution = 10,
1097 };
1098
1099 static const struct meson_sar_adc_param meson_sar_adc_gxl_param = {
1100         .has_bl30_integration = true,
1101         .clock_rate = 1200000,
1102         .bandgap_reg = MESON_SAR_ADC_REG11,
1103         .regmap_config = &meson_sar_adc_regmap_config_gxbb,
1104         .resolution = 12,
1105 };
1106
1107 static const struct meson_sar_adc_param meson_sar_adc_g12a_param = {
1108         .has_bl30_integration = false,
1109         .clock_rate = 1200000,
1110         .bandgap_reg = MESON_SAR_ADC_REG11,
1111         .regmap_config = &meson_sar_adc_regmap_config_gxbb,
1112         .resolution = 12,
1113 };
1114
1115 static const struct meson_sar_adc_data meson_sar_adc_meson8_data = {
1116         .param = &meson_sar_adc_meson8_param,
1117         .name = "meson-meson8-saradc",
1118 };
1119
1120 static const struct meson_sar_adc_data meson_sar_adc_meson8b_data = {
1121         .param = &meson_sar_adc_meson8b_param,
1122         .name = "meson-meson8b-saradc",
1123 };
1124
1125 static const struct meson_sar_adc_data meson_sar_adc_meson8m2_data = {
1126         .param = &meson_sar_adc_meson8b_param,
1127         .name = "meson-meson8m2-saradc",
1128 };
1129
1130 static const struct meson_sar_adc_data meson_sar_adc_gxbb_data = {
1131         .param = &meson_sar_adc_gxbb_param,
1132         .name = "meson-gxbb-saradc",
1133 };
1134
1135 static const struct meson_sar_adc_data meson_sar_adc_gxl_data = {
1136         .param = &meson_sar_adc_gxl_param,
1137         .name = "meson-gxl-saradc",
1138 };
1139
1140 static const struct meson_sar_adc_data meson_sar_adc_gxm_data = {
1141         .param = &meson_sar_adc_gxl_param,
1142         .name = "meson-gxm-saradc",
1143 };
1144
1145 static const struct meson_sar_adc_data meson_sar_adc_axg_data = {
1146         .param = &meson_sar_adc_gxl_param,
1147         .name = "meson-axg-saradc",
1148 };
1149
1150 static const struct meson_sar_adc_data meson_sar_adc_g12a_data = {
1151         .param = &meson_sar_adc_g12a_param,
1152         .name = "meson-g12a-saradc",
1153 };
1154
1155 static const struct of_device_id meson_sar_adc_of_match[] = {
1156         {
1157                 .compatible = "amlogic,meson8-saradc",
1158                 .data = &meson_sar_adc_meson8_data,
1159         }, {
1160                 .compatible = "amlogic,meson8b-saradc",
1161                 .data = &meson_sar_adc_meson8b_data,
1162         }, {
1163                 .compatible = "amlogic,meson8m2-saradc",
1164                 .data = &meson_sar_adc_meson8m2_data,
1165         }, {
1166                 .compatible = "amlogic,meson-gxbb-saradc",
1167                 .data = &meson_sar_adc_gxbb_data,
1168         }, {
1169                 .compatible = "amlogic,meson-gxl-saradc",
1170                 .data = &meson_sar_adc_gxl_data,
1171         }, {
1172                 .compatible = "amlogic,meson-gxm-saradc",
1173                 .data = &meson_sar_adc_gxm_data,
1174         }, {
1175                 .compatible = "amlogic,meson-axg-saradc",
1176                 .data = &meson_sar_adc_axg_data,
1177         }, {
1178                 .compatible = "amlogic,meson-g12a-saradc",
1179                 .data = &meson_sar_adc_g12a_data,
1180         },
1181         { /* sentinel */ }
1182 };
1183 MODULE_DEVICE_TABLE(of, meson_sar_adc_of_match);
1184
1185 static int meson_sar_adc_probe(struct platform_device *pdev)
1186 {
1187         const struct meson_sar_adc_data *match_data;
1188         struct meson_sar_adc_priv *priv;
1189         struct iio_dev *indio_dev;
1190         void __iomem *base;
1191         int irq, ret;
1192
1193         indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*priv));
1194         if (!indio_dev) {
1195                 dev_err(&pdev->dev, "failed allocating iio device\n");
1196                 return -ENOMEM;
1197         }
1198
1199         priv = iio_priv(indio_dev);
1200         init_completion(&priv->done);
1201
1202         match_data = of_device_get_match_data(&pdev->dev);
1203         if (!match_data) {
1204                 dev_err(&pdev->dev, "failed to get match data\n");
1205                 return -ENODEV;
1206         }
1207
1208         priv->param = match_data->param;
1209
1210         indio_dev->name = match_data->name;
1211         indio_dev->modes = INDIO_DIRECT_MODE;
1212         indio_dev->info = &meson_sar_adc_iio_info;
1213
1214         base = devm_platform_ioremap_resource(pdev, 0);
1215         if (IS_ERR(base))
1216                 return PTR_ERR(base);
1217
1218         priv->regmap = devm_regmap_init_mmio(&pdev->dev, base,
1219                                              priv->param->regmap_config);
1220         if (IS_ERR(priv->regmap))
1221                 return PTR_ERR(priv->regmap);
1222
1223         irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
1224         if (!irq)
1225                 return -EINVAL;
1226
1227         ret = devm_request_irq(&pdev->dev, irq, meson_sar_adc_irq, IRQF_SHARED,
1228                                dev_name(&pdev->dev), indio_dev);
1229         if (ret)
1230                 return ret;
1231
1232         priv->clkin = devm_clk_get(&pdev->dev, "clkin");
1233         if (IS_ERR(priv->clkin))
1234                 return dev_err_probe(&pdev->dev, PTR_ERR(priv->clkin),
1235                                      "failed to get clkin\n");
1236
1237         priv->core_clk = devm_clk_get(&pdev->dev, "core");
1238         if (IS_ERR(priv->core_clk))
1239                 return dev_err_probe(&pdev->dev, PTR_ERR(priv->core_clk),
1240                                      "failed to get core clk\n");
1241
1242         priv->adc_clk = devm_clk_get(&pdev->dev, "adc_clk");
1243         if (IS_ERR(priv->adc_clk)) {
1244                 if (PTR_ERR(priv->adc_clk) == -ENOENT)
1245                         priv->adc_clk = NULL;
1246                 else
1247                         return dev_err_probe(&pdev->dev, PTR_ERR(priv->adc_clk),
1248                                              "failed to get adc clk\n");
1249         }
1250
1251         priv->adc_sel_clk = devm_clk_get(&pdev->dev, "adc_sel");
1252         if (IS_ERR(priv->adc_sel_clk)) {
1253                 if (PTR_ERR(priv->adc_sel_clk) == -ENOENT)
1254                         priv->adc_sel_clk = NULL;
1255                 else
1256                         return dev_err_probe(&pdev->dev, PTR_ERR(priv->adc_sel_clk),
1257                                              "failed to get adc_sel clk\n");
1258         }
1259
1260         /* on pre-GXBB SoCs the SAR ADC itself provides the ADC clock: */
1261         if (!priv->adc_clk) {
1262                 ret = meson_sar_adc_clk_init(indio_dev, base);
1263                 if (ret)
1264                         return ret;
1265         }
1266
1267         priv->vref = devm_regulator_get(&pdev->dev, "vref");
1268         if (IS_ERR(priv->vref))
1269                 return dev_err_probe(&pdev->dev, PTR_ERR(priv->vref),
1270                                      "failed to get vref regulator\n");
1271
1272         priv->calibscale = MILLION;
1273
1274         if (priv->param->temperature_trimming_bits) {
1275                 ret = meson_sar_adc_temp_sensor_init(indio_dev);
1276                 if (ret)
1277                         return ret;
1278         }
1279
1280         if (priv->temperature_sensor_calibrated) {
1281                 indio_dev->channels = meson_sar_adc_and_temp_iio_channels;
1282                 indio_dev->num_channels =
1283                         ARRAY_SIZE(meson_sar_adc_and_temp_iio_channels);
1284         } else {
1285                 indio_dev->channels = meson_sar_adc_iio_channels;
1286                 indio_dev->num_channels =
1287                         ARRAY_SIZE(meson_sar_adc_iio_channels);
1288         }
1289
1290         ret = meson_sar_adc_init(indio_dev);
1291         if (ret)
1292                 goto err;
1293
1294         ret = meson_sar_adc_hw_enable(indio_dev);
1295         if (ret)
1296                 goto err;
1297
1298         ret = meson_sar_adc_calib(indio_dev);
1299         if (ret)
1300                 dev_warn(&pdev->dev, "calibration failed\n");
1301
1302         platform_set_drvdata(pdev, indio_dev);
1303
1304         ret = iio_device_register(indio_dev);
1305         if (ret)
1306                 goto err_hw;
1307
1308         return 0;
1309
1310 err_hw:
1311         meson_sar_adc_hw_disable(indio_dev);
1312 err:
1313         return ret;
1314 }
1315
1316 static int meson_sar_adc_remove(struct platform_device *pdev)
1317 {
1318         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
1319
1320         iio_device_unregister(indio_dev);
1321
1322         return meson_sar_adc_hw_disable(indio_dev);
1323 }
1324
1325 static int __maybe_unused meson_sar_adc_suspend(struct device *dev)
1326 {
1327         struct iio_dev *indio_dev = dev_get_drvdata(dev);
1328
1329         return meson_sar_adc_hw_disable(indio_dev);
1330 }
1331
1332 static int __maybe_unused meson_sar_adc_resume(struct device *dev)
1333 {
1334         struct iio_dev *indio_dev = dev_get_drvdata(dev);
1335
1336         return meson_sar_adc_hw_enable(indio_dev);
1337 }
1338
1339 static SIMPLE_DEV_PM_OPS(meson_sar_adc_pm_ops,
1340                          meson_sar_adc_suspend, meson_sar_adc_resume);
1341
1342 static struct platform_driver meson_sar_adc_driver = {
1343         .probe          = meson_sar_adc_probe,
1344         .remove         = meson_sar_adc_remove,
1345         .driver         = {
1346                 .name   = "meson-saradc",
1347                 .of_match_table = meson_sar_adc_of_match,
1348                 .pm = &meson_sar_adc_pm_ops,
1349         },
1350 };
1351
1352 module_platform_driver(meson_sar_adc_driver);
1353
1354 MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
1355 MODULE_DESCRIPTION("Amlogic Meson SAR ADC driver");
1356 MODULE_LICENSE("GPL v2");