diff options
Diffstat (limited to 'drivers/iio/adc/meson_saradc.c')
| -rw-r--r-- | drivers/iio/adc/meson_saradc.c | 1355 |
1 files changed, 1355 insertions, 0 deletions
diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c new file mode 100644 index 000000000..e771299fa --- /dev/null +++ b/drivers/iio/adc/meson_saradc.c @@ -0,0 +1,1355 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Amlogic Meson Successive Approximation Register (SAR) A/D Converter + * + * Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com> + */ + +#include <linux/bitfield.h> +#include <linux/clk.h> +#include <linux/clk-provider.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/iio/iio.h> +#include <linux/module.h> +#include <linux/nvmem-consumer.h> +#include <linux/interrupt.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/regulator/consumer.h> +#include <linux/mfd/syscon.h> + +#define MESON_SAR_ADC_REG0 0x00 + #define MESON_SAR_ADC_REG0_PANEL_DETECT BIT(31) + #define MESON_SAR_ADC_REG0_BUSY_MASK GENMASK(30, 28) + #define MESON_SAR_ADC_REG0_DELTA_BUSY BIT(30) + #define MESON_SAR_ADC_REG0_AVG_BUSY BIT(29) + #define MESON_SAR_ADC_REG0_SAMPLE_BUSY BIT(28) + #define MESON_SAR_ADC_REG0_FIFO_FULL BIT(27) + #define MESON_SAR_ADC_REG0_FIFO_EMPTY BIT(26) + #define MESON_SAR_ADC_REG0_FIFO_COUNT_MASK GENMASK(25, 21) + #define MESON_SAR_ADC_REG0_ADC_BIAS_CTRL_MASK GENMASK(20, 19) + #define MESON_SAR_ADC_REG0_CURR_CHAN_ID_MASK GENMASK(18, 16) + #define MESON_SAR_ADC_REG0_ADC_TEMP_SEN_SEL BIT(15) + #define MESON_SAR_ADC_REG0_SAMPLING_STOP BIT(14) + #define MESON_SAR_ADC_REG0_CHAN_DELTA_EN_MASK GENMASK(13, 12) + #define MESON_SAR_ADC_REG0_DETECT_IRQ_POL BIT(10) + #define MESON_SAR_ADC_REG0_DETECT_IRQ_EN BIT(9) + #define MESON_SAR_ADC_REG0_FIFO_CNT_IRQ_MASK GENMASK(8, 4) + #define MESON_SAR_ADC_REG0_FIFO_IRQ_EN BIT(3) + #define MESON_SAR_ADC_REG0_SAMPLING_START BIT(2) + #define MESON_SAR_ADC_REG0_CONTINUOUS_EN BIT(1) + #define MESON_SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE BIT(0) + +#define MESON_SAR_ADC_CHAN_LIST 0x04 + #define MESON_SAR_ADC_CHAN_LIST_MAX_INDEX_MASK GENMASK(26, 24) + #define MESON_SAR_ADC_CHAN_LIST_ENTRY_MASK(_chan) \ + (GENMASK(2, 0) << ((_chan) * 3)) + +#define MESON_SAR_ADC_AVG_CNTL 0x08 + #define MESON_SAR_ADC_AVG_CNTL_AVG_MODE_SHIFT(_chan) \ + (16 + ((_chan) * 2)) + #define MESON_SAR_ADC_AVG_CNTL_AVG_MODE_MASK(_chan) \ + (GENMASK(17, 16) << ((_chan) * 2)) + #define MESON_SAR_ADC_AVG_CNTL_NUM_SAMPLES_SHIFT(_chan) \ + (0 + ((_chan) * 2)) + #define MESON_SAR_ADC_AVG_CNTL_NUM_SAMPLES_MASK(_chan) \ + (GENMASK(1, 0) << ((_chan) * 2)) + +#define MESON_SAR_ADC_REG3 0x0c + #define MESON_SAR_ADC_REG3_CNTL_USE_SC_DLY BIT(31) + #define MESON_SAR_ADC_REG3_CLK_EN BIT(30) + #define MESON_SAR_ADC_REG3_BL30_INITIALIZED BIT(28) + #define MESON_SAR_ADC_REG3_CTRL_CONT_RING_COUNTER_EN BIT(27) + #define MESON_SAR_ADC_REG3_CTRL_SAMPLING_CLOCK_PHASE BIT(26) + #define MESON_SAR_ADC_REG3_CTRL_CHAN7_MUX_SEL_MASK GENMASK(25, 23) + #define MESON_SAR_ADC_REG3_DETECT_EN BIT(22) + #define MESON_SAR_ADC_REG3_ADC_EN BIT(21) + #define MESON_SAR_ADC_REG3_PANEL_DETECT_COUNT_MASK GENMASK(20, 18) + #define MESON_SAR_ADC_REG3_PANEL_DETECT_FILTER_TB_MASK GENMASK(17, 16) + #define MESON_SAR_ADC_REG3_ADC_CLK_DIV_SHIFT 10 + #define MESON_SAR_ADC_REG3_ADC_CLK_DIV_WIDTH 6 + #define MESON_SAR_ADC_REG3_BLOCK_DLY_SEL_MASK GENMASK(9, 8) + #define MESON_SAR_ADC_REG3_BLOCK_DLY_MASK GENMASK(7, 0) + +#define MESON_SAR_ADC_DELAY 0x10 + #define MESON_SAR_ADC_DELAY_INPUT_DLY_SEL_MASK GENMASK(25, 24) + #define MESON_SAR_ADC_DELAY_BL30_BUSY BIT(15) + #define MESON_SAR_ADC_DELAY_KERNEL_BUSY BIT(14) + #define MESON_SAR_ADC_DELAY_INPUT_DLY_CNT_MASK GENMASK(23, 16) + #define MESON_SAR_ADC_DELAY_SAMPLE_DLY_SEL_MASK GENMASK(9, 8) + #define MESON_SAR_ADC_DELAY_SAMPLE_DLY_CNT_MASK GENMASK(7, 0) + +#define MESON_SAR_ADC_LAST_RD 0x14 + #define MESON_SAR_ADC_LAST_RD_LAST_CHANNEL1_MASK GENMASK(23, 16) + #define MESON_SAR_ADC_LAST_RD_LAST_CHANNEL0_MASK GENMASK(9, 0) + +#define MESON_SAR_ADC_FIFO_RD 0x18 + #define MESON_SAR_ADC_FIFO_RD_CHAN_ID_MASK GENMASK(14, 12) + #define MESON_SAR_ADC_FIFO_RD_SAMPLE_VALUE_MASK GENMASK(11, 0) + +#define MESON_SAR_ADC_AUX_SW 0x1c + #define MESON_SAR_ADC_AUX_SW_MUX_SEL_CHAN_SHIFT(_chan) \ + (8 + (((_chan) - 2) * 3)) + #define MESON_SAR_ADC_AUX_SW_VREF_P_MUX BIT(6) + #define MESON_SAR_ADC_AUX_SW_VREF_N_MUX BIT(5) + #define MESON_SAR_ADC_AUX_SW_MODE_SEL BIT(4) + #define MESON_SAR_ADC_AUX_SW_YP_DRIVE_SW BIT(3) + #define MESON_SAR_ADC_AUX_SW_XP_DRIVE_SW BIT(2) + #define MESON_SAR_ADC_AUX_SW_YM_DRIVE_SW BIT(1) + #define MESON_SAR_ADC_AUX_SW_XM_DRIVE_SW BIT(0) + +#define MESON_SAR_ADC_CHAN_10_SW 0x20 + #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_MUX_SEL_MASK GENMASK(25, 23) + #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_VREF_P_MUX BIT(22) + #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_VREF_N_MUX BIT(21) + #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_MODE_SEL BIT(20) + #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_YP_DRIVE_SW BIT(19) + #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_XP_DRIVE_SW BIT(18) + #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_YM_DRIVE_SW BIT(17) + #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_XM_DRIVE_SW BIT(16) + #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_MUX_SEL_MASK GENMASK(9, 7) + #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_VREF_P_MUX BIT(6) + #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_VREF_N_MUX BIT(5) + #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_MODE_SEL BIT(4) + #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_YP_DRIVE_SW BIT(3) + #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_XP_DRIVE_SW BIT(2) + #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_YM_DRIVE_SW BIT(1) + #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_XM_DRIVE_SW BIT(0) + +#define MESON_SAR_ADC_DETECT_IDLE_SW 0x24 + #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_SW_EN BIT(26) + #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_MUX_MASK GENMASK(25, 23) + #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_VREF_P_MUX BIT(22) + #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_VREF_N_MUX BIT(21) + #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_MODE_SEL BIT(20) + #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_YP_DRIVE_SW BIT(19) + #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_XP_DRIVE_SW BIT(18) + #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_YM_DRIVE_SW BIT(17) + #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_XM_DRIVE_SW BIT(16) + #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_MUX_SEL_MASK GENMASK(9, 7) + #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_VREF_P_MUX BIT(6) + #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_VREF_N_MUX BIT(5) + #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_MODE_SEL BIT(4) + #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_YP_DRIVE_SW BIT(3) + #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_XP_DRIVE_SW BIT(2) + #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_YM_DRIVE_SW BIT(1) + #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_XM_DRIVE_SW BIT(0) + +#define MESON_SAR_ADC_DELTA_10 0x28 + #define MESON_SAR_ADC_DELTA_10_TEMP_SEL BIT(27) + #define MESON_SAR_ADC_DELTA_10_TS_REVE1 BIT(26) + #define MESON_SAR_ADC_DELTA_10_CHAN1_DELTA_VALUE_MASK GENMASK(25, 16) + #define MESON_SAR_ADC_DELTA_10_TS_REVE0 BIT(15) + #define MESON_SAR_ADC_DELTA_10_TS_C_MASK GENMASK(14, 11) + #define MESON_SAR_ADC_DELTA_10_TS_VBG_EN BIT(10) + #define MESON_SAR_ADC_DELTA_10_CHAN0_DELTA_VALUE_MASK GENMASK(9, 0) + +/* + * NOTE: registers from here are undocumented (the vendor Linux kernel driver + * and u-boot source served as reference). These only seem to be relevant on + * GXBB and newer. + */ +#define MESON_SAR_ADC_REG11 0x2c + #define MESON_SAR_ADC_REG11_BANDGAP_EN BIT(13) + +#define MESON_SAR_ADC_REG13 0x34 + #define MESON_SAR_ADC_REG13_12BIT_CALIBRATION_MASK GENMASK(13, 8) + +#define MESON_SAR_ADC_MAX_FIFO_SIZE 32 +#define MESON_SAR_ADC_TIMEOUT 100 /* ms */ +#define MESON_SAR_ADC_VOLTAGE_AND_TEMP_CHANNEL 6 +#define MESON_SAR_ADC_TEMP_OFFSET 27 + +/* temperature sensor calibration information in eFuse */ +#define MESON_SAR_ADC_EFUSE_BYTES 4 +#define MESON_SAR_ADC_EFUSE_BYTE3_UPPER_ADC_VAL GENMASK(6, 0) +#define MESON_SAR_ADC_EFUSE_BYTE3_IS_CALIBRATED BIT(7) + +#define MESON_HHI_DPLL_TOP_0 0x318 +#define MESON_HHI_DPLL_TOP_0_TSC_BIT4 BIT(9) + +/* for use with IIO_VAL_INT_PLUS_MICRO */ +#define MILLION 1000000 + +#define MESON_SAR_ADC_CHAN(_chan) { \ + .type = IIO_VOLTAGE, \ + .indexed = 1, \ + .channel = _chan, \ + .address = _chan, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_AVERAGE_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_CALIBBIAS) | \ + BIT(IIO_CHAN_INFO_CALIBSCALE), \ + .datasheet_name = "SAR_ADC_CH"#_chan, \ +} + +#define MESON_SAR_ADC_TEMP_CHAN(_chan) { \ + .type = IIO_TEMP, \ + .channel = _chan, \ + .address = MESON_SAR_ADC_VOLTAGE_AND_TEMP_CHANNEL, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_AVERAGE_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | \ + BIT(IIO_CHAN_INFO_SCALE), \ + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_CALIBBIAS) | \ + BIT(IIO_CHAN_INFO_CALIBSCALE), \ + .datasheet_name = "TEMP_SENSOR", \ +} + +static const struct iio_chan_spec meson_sar_adc_iio_channels[] = { + MESON_SAR_ADC_CHAN(0), + MESON_SAR_ADC_CHAN(1), + MESON_SAR_ADC_CHAN(2), + MESON_SAR_ADC_CHAN(3), + MESON_SAR_ADC_CHAN(4), + MESON_SAR_ADC_CHAN(5), + MESON_SAR_ADC_CHAN(6), + MESON_SAR_ADC_CHAN(7), + IIO_CHAN_SOFT_TIMESTAMP(8), +}; + +static const struct iio_chan_spec meson_sar_adc_and_temp_iio_channels[] = { + MESON_SAR_ADC_CHAN(0), + MESON_SAR_ADC_CHAN(1), + MESON_SAR_ADC_CHAN(2), + MESON_SAR_ADC_CHAN(3), + MESON_SAR_ADC_CHAN(4), + MESON_SAR_ADC_CHAN(5), + MESON_SAR_ADC_CHAN(6), + MESON_SAR_ADC_CHAN(7), + MESON_SAR_ADC_TEMP_CHAN(8), + IIO_CHAN_SOFT_TIMESTAMP(9), +}; + +enum meson_sar_adc_avg_mode { + NO_AVERAGING = 0x0, + MEAN_AVERAGING = 0x1, + MEDIAN_AVERAGING = 0x2, +}; + +enum meson_sar_adc_num_samples { + ONE_SAMPLE = 0x0, + TWO_SAMPLES = 0x1, + FOUR_SAMPLES = 0x2, + EIGHT_SAMPLES = 0x3, +}; + +enum meson_sar_adc_chan7_mux_sel { + CHAN7_MUX_VSS = 0x0, + CHAN7_MUX_VDD_DIV4 = 0x1, + CHAN7_MUX_VDD_DIV2 = 0x2, + CHAN7_MUX_VDD_MUL3_DIV4 = 0x3, + CHAN7_MUX_VDD = 0x4, + CHAN7_MUX_CH7_INPUT = 0x7, +}; + +struct meson_sar_adc_param { + bool has_bl30_integration; + unsigned long clock_rate; + u32 bandgap_reg; + unsigned int resolution; + const struct regmap_config *regmap_config; + u8 temperature_trimming_bits; + unsigned int temperature_multiplier; + unsigned int temperature_divider; +}; + +struct meson_sar_adc_data { + const struct meson_sar_adc_param *param; + const char *name; +}; + +struct meson_sar_adc_priv { + struct regmap *regmap; + struct regulator *vref; + const struct meson_sar_adc_param *param; + struct clk *clkin; + struct clk *core_clk; + struct clk *adc_sel_clk; + struct clk *adc_clk; + struct clk_gate clk_gate; + struct clk *adc_div_clk; + struct clk_divider clk_div; + struct completion done; + int calibbias; + int calibscale; + struct regmap *tsc_regmap; + bool temperature_sensor_calibrated; + u8 temperature_sensor_coefficient; + u16 temperature_sensor_adc_val; +}; + +static const struct regmap_config meson_sar_adc_regmap_config_gxbb = { + .reg_bits = 8, + .val_bits = 32, + .reg_stride = 4, + .max_register = MESON_SAR_ADC_REG13, +}; + +static const struct regmap_config meson_sar_adc_regmap_config_meson8 = { + .reg_bits = 8, + .val_bits = 32, + .reg_stride = 4, + .max_register = MESON_SAR_ADC_DELTA_10, +}; + +static unsigned int meson_sar_adc_get_fifo_count(struct iio_dev *indio_dev) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + u32 regval; + + regmap_read(priv->regmap, MESON_SAR_ADC_REG0, ®val); + + return FIELD_GET(MESON_SAR_ADC_REG0_FIFO_COUNT_MASK, regval); +} + +static int meson_sar_adc_calib_val(struct iio_dev *indio_dev, int val) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + int tmp; + + /* use val_calib = scale * val_raw + offset calibration function */ + tmp = div_s64((s64)val * priv->calibscale, MILLION) + priv->calibbias; + + return clamp(tmp, 0, (1 << priv->param->resolution) - 1); +} + +static int meson_sar_adc_wait_busy_clear(struct iio_dev *indio_dev) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + int regval, timeout = 10000; + + /* + * NOTE: we need a small delay before reading the status, otherwise + * the sample engine may not have started internally (which would + * seem to us that sampling is already finished). + */ + do { + udelay(1); + regmap_read(priv->regmap, MESON_SAR_ADC_REG0, ®val); + } while (FIELD_GET(MESON_SAR_ADC_REG0_BUSY_MASK, regval) && timeout--); + + if (timeout < 0) + return -ETIMEDOUT; + + return 0; +} + +static int meson_sar_adc_read_raw_sample(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + int *val) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + int regval, fifo_chan, fifo_val, count; + + if(!wait_for_completion_timeout(&priv->done, + msecs_to_jiffies(MESON_SAR_ADC_TIMEOUT))) + return -ETIMEDOUT; + + count = meson_sar_adc_get_fifo_count(indio_dev); + if (count != 1) { + dev_err(&indio_dev->dev, + "ADC FIFO has %d element(s) instead of one\n", count); + return -EINVAL; + } + + regmap_read(priv->regmap, MESON_SAR_ADC_FIFO_RD, ®val); + fifo_chan = FIELD_GET(MESON_SAR_ADC_FIFO_RD_CHAN_ID_MASK, regval); + if (fifo_chan != chan->address) { + dev_err(&indio_dev->dev, + "ADC FIFO entry belongs to channel %d instead of %lu\n", + fifo_chan, chan->address); + return -EINVAL; + } + + fifo_val = FIELD_GET(MESON_SAR_ADC_FIFO_RD_SAMPLE_VALUE_MASK, regval); + fifo_val &= GENMASK(priv->param->resolution - 1, 0); + *val = meson_sar_adc_calib_val(indio_dev, fifo_val); + + return 0; +} + +static void meson_sar_adc_set_averaging(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum meson_sar_adc_avg_mode mode, + enum meson_sar_adc_num_samples samples) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + int val, address = chan->address; + + val = samples << MESON_SAR_ADC_AVG_CNTL_NUM_SAMPLES_SHIFT(address); + regmap_update_bits(priv->regmap, MESON_SAR_ADC_AVG_CNTL, + MESON_SAR_ADC_AVG_CNTL_NUM_SAMPLES_MASK(address), + val); + + val = mode << MESON_SAR_ADC_AVG_CNTL_AVG_MODE_SHIFT(address); + regmap_update_bits(priv->regmap, MESON_SAR_ADC_AVG_CNTL, + MESON_SAR_ADC_AVG_CNTL_AVG_MODE_MASK(address), val); +} + +static void meson_sar_adc_enable_channel(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + u32 regval; + + /* + * the SAR ADC engine allows sampling multiple channels at the same + * time. to keep it simple we're only working with one *internal* + * channel, which starts counting at index 0 (which means: count = 1). + */ + regval = FIELD_PREP(MESON_SAR_ADC_CHAN_LIST_MAX_INDEX_MASK, 0); + regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_LIST, + MESON_SAR_ADC_CHAN_LIST_MAX_INDEX_MASK, regval); + + /* map channel index 0 to the channel which we want to read */ + regval = FIELD_PREP(MESON_SAR_ADC_CHAN_LIST_ENTRY_MASK(0), + chan->address); + regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_LIST, + MESON_SAR_ADC_CHAN_LIST_ENTRY_MASK(0), regval); + + regval = FIELD_PREP(MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_MUX_MASK, + chan->address); + regmap_update_bits(priv->regmap, MESON_SAR_ADC_DETECT_IDLE_SW, + MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_MUX_MASK, + regval); + + regval = FIELD_PREP(MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_MUX_SEL_MASK, + chan->address); + regmap_update_bits(priv->regmap, MESON_SAR_ADC_DETECT_IDLE_SW, + MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_MUX_SEL_MASK, + regval); + + if (chan->address == MESON_SAR_ADC_VOLTAGE_AND_TEMP_CHANNEL) { + if (chan->type == IIO_TEMP) + regval = MESON_SAR_ADC_DELTA_10_TEMP_SEL; + else + regval = 0; + + regmap_update_bits(priv->regmap, + MESON_SAR_ADC_DELTA_10, + MESON_SAR_ADC_DELTA_10_TEMP_SEL, regval); + } +} + +static void meson_sar_adc_set_chan7_mux(struct iio_dev *indio_dev, + enum meson_sar_adc_chan7_mux_sel sel) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + u32 regval; + + regval = FIELD_PREP(MESON_SAR_ADC_REG3_CTRL_CHAN7_MUX_SEL_MASK, sel); + regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3, + MESON_SAR_ADC_REG3_CTRL_CHAN7_MUX_SEL_MASK, regval); + + usleep_range(10, 20); +} + +static void meson_sar_adc_start_sample_engine(struct iio_dev *indio_dev) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + + reinit_completion(&priv->done); + + regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0, + MESON_SAR_ADC_REG0_FIFO_IRQ_EN, + MESON_SAR_ADC_REG0_FIFO_IRQ_EN); + + regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0, + MESON_SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE, + MESON_SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE); + + regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0, + MESON_SAR_ADC_REG0_SAMPLING_START, + MESON_SAR_ADC_REG0_SAMPLING_START); +} + +static void meson_sar_adc_stop_sample_engine(struct iio_dev *indio_dev) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + + regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0, + MESON_SAR_ADC_REG0_FIFO_IRQ_EN, 0); + + regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0, + MESON_SAR_ADC_REG0_SAMPLING_STOP, + MESON_SAR_ADC_REG0_SAMPLING_STOP); + + /* wait until all modules are stopped */ + meson_sar_adc_wait_busy_clear(indio_dev); + + regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0, + MESON_SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE, 0); +} + +static int meson_sar_adc_lock(struct iio_dev *indio_dev) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + int val, timeout = 10000; + + mutex_lock(&indio_dev->mlock); + + if (priv->param->has_bl30_integration) { + /* prevent BL30 from using the SAR ADC while we are using it */ + regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY, + MESON_SAR_ADC_DELAY_KERNEL_BUSY, + MESON_SAR_ADC_DELAY_KERNEL_BUSY); + + /* + * wait until BL30 releases it's lock (so we can use the SAR + * ADC) + */ + do { + udelay(1); + regmap_read(priv->regmap, MESON_SAR_ADC_DELAY, &val); + } while (val & MESON_SAR_ADC_DELAY_BL30_BUSY && timeout--); + + if (timeout < 0) { + mutex_unlock(&indio_dev->mlock); + return -ETIMEDOUT; + } + } + + return 0; +} + +static void meson_sar_adc_unlock(struct iio_dev *indio_dev) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + + if (priv->param->has_bl30_integration) + /* allow BL30 to use the SAR ADC again */ + regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY, + MESON_SAR_ADC_DELAY_KERNEL_BUSY, 0); + + mutex_unlock(&indio_dev->mlock); +} + +static void meson_sar_adc_clear_fifo(struct iio_dev *indio_dev) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + unsigned int count, tmp; + + for (count = 0; count < MESON_SAR_ADC_MAX_FIFO_SIZE; count++) { + if (!meson_sar_adc_get_fifo_count(indio_dev)) + break; + + regmap_read(priv->regmap, MESON_SAR_ADC_FIFO_RD, &tmp); + } +} + +static int meson_sar_adc_get_sample(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum meson_sar_adc_avg_mode avg_mode, + enum meson_sar_adc_num_samples avg_samples, + int *val) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + int ret; + + if (chan->type == IIO_TEMP && !priv->temperature_sensor_calibrated) + return -ENOTSUPP; + + ret = meson_sar_adc_lock(indio_dev); + if (ret) + return ret; + + /* clear the FIFO to make sure we're not reading old values */ + meson_sar_adc_clear_fifo(indio_dev); + + meson_sar_adc_set_averaging(indio_dev, chan, avg_mode, avg_samples); + + meson_sar_adc_enable_channel(indio_dev, chan); + + meson_sar_adc_start_sample_engine(indio_dev); + ret = meson_sar_adc_read_raw_sample(indio_dev, chan, val); + meson_sar_adc_stop_sample_engine(indio_dev); + + meson_sar_adc_unlock(indio_dev); + + if (ret) { + dev_warn(indio_dev->dev.parent, + "failed to read sample for channel %lu: %d\n", + chan->address, ret); + return ret; + } + + return IIO_VAL_INT; +} + +static int meson_sar_adc_iio_info_read_raw(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + int *val, int *val2, long mask) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + return meson_sar_adc_get_sample(indio_dev, chan, NO_AVERAGING, + ONE_SAMPLE, val); + break; + + case IIO_CHAN_INFO_AVERAGE_RAW: + return meson_sar_adc_get_sample(indio_dev, chan, + MEAN_AVERAGING, EIGHT_SAMPLES, + val); + break; + + case IIO_CHAN_INFO_SCALE: + if (chan->type == IIO_VOLTAGE) { + ret = regulator_get_voltage(priv->vref); + if (ret < 0) { + dev_err(indio_dev->dev.parent, + "failed to get vref voltage: %d\n", + ret); + return ret; + } + + *val = ret / 1000; + *val2 = priv->param->resolution; + return IIO_VAL_FRACTIONAL_LOG2; + } else if (chan->type == IIO_TEMP) { + /* SoC specific multiplier and divider */ + *val = priv->param->temperature_multiplier; + *val2 = priv->param->temperature_divider; + + /* celsius to millicelsius */ + *val *= 1000; + + return IIO_VAL_FRACTIONAL; + } else { + return -EINVAL; + } + + case IIO_CHAN_INFO_CALIBBIAS: + *val = priv->calibbias; + return IIO_VAL_INT; + + case IIO_CHAN_INFO_CALIBSCALE: + *val = priv->calibscale / MILLION; + *val2 = priv->calibscale % MILLION; + return IIO_VAL_INT_PLUS_MICRO; + + case IIO_CHAN_INFO_OFFSET: + *val = DIV_ROUND_CLOSEST(MESON_SAR_ADC_TEMP_OFFSET * + priv->param->temperature_divider, + priv->param->temperature_multiplier); + *val -= priv->temperature_sensor_adc_val; + return IIO_VAL_INT; + + default: + return -EINVAL; + } +} + +static int meson_sar_adc_clk_init(struct iio_dev *indio_dev, + void __iomem *base) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + struct clk_init_data init; + const char *clk_parents[1]; + + init.name = devm_kasprintf(&indio_dev->dev, GFP_KERNEL, "%s#adc_div", + dev_name(indio_dev->dev.parent)); + if (!init.name) + return -ENOMEM; + + init.flags = 0; + init.ops = &clk_divider_ops; + clk_parents[0] = __clk_get_name(priv->clkin); + init.parent_names = clk_parents; + init.num_parents = 1; + + priv->clk_div.reg = base + MESON_SAR_ADC_REG3; + priv->clk_div.shift = MESON_SAR_ADC_REG3_ADC_CLK_DIV_SHIFT; + priv->clk_div.width = MESON_SAR_ADC_REG3_ADC_CLK_DIV_WIDTH; + priv->clk_div.hw.init = &init; + priv->clk_div.flags = 0; + + priv->adc_div_clk = devm_clk_register(&indio_dev->dev, + &priv->clk_div.hw); + if (WARN_ON(IS_ERR(priv->adc_div_clk))) + return PTR_ERR(priv->adc_div_clk); + + init.name = devm_kasprintf(&indio_dev->dev, GFP_KERNEL, "%s#adc_en", + dev_name(indio_dev->dev.parent)); + if (!init.name) + return -ENOMEM; + + init.flags = CLK_SET_RATE_PARENT; + init.ops = &clk_gate_ops; + clk_parents[0] = __clk_get_name(priv->adc_div_clk); + init.parent_names = clk_parents; + init.num_parents = 1; + + priv->clk_gate.reg = base + MESON_SAR_ADC_REG3; + priv->clk_gate.bit_idx = __ffs(MESON_SAR_ADC_REG3_CLK_EN); + priv->clk_gate.hw.init = &init; + + priv->adc_clk = devm_clk_register(&indio_dev->dev, &priv->clk_gate.hw); + if (WARN_ON(IS_ERR(priv->adc_clk))) + return PTR_ERR(priv->adc_clk); + + return 0; +} + +static int meson_sar_adc_temp_sensor_init(struct iio_dev *indio_dev) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + u8 *buf, trimming_bits, trimming_mask, upper_adc_val; + struct nvmem_cell *temperature_calib; + size_t read_len; + int ret; + + temperature_calib = devm_nvmem_cell_get(indio_dev->dev.parent, + "temperature_calib"); + if (IS_ERR(temperature_calib)) { + ret = PTR_ERR(temperature_calib); + + /* + * leave the temperature sensor disabled if no calibration data + * was passed via nvmem-cells. + */ + if (ret == -ENODEV) + return 0; + + return dev_err_probe(indio_dev->dev.parent, ret, + "failed to get temperature_calib cell\n"); + } + + priv->tsc_regmap = + syscon_regmap_lookup_by_phandle(indio_dev->dev.parent->of_node, + "amlogic,hhi-sysctrl"); + if (IS_ERR(priv->tsc_regmap)) { + dev_err(indio_dev->dev.parent, + "failed to get amlogic,hhi-sysctrl regmap\n"); + return PTR_ERR(priv->tsc_regmap); + } + + read_len = MESON_SAR_ADC_EFUSE_BYTES; + buf = nvmem_cell_read(temperature_calib, &read_len); + if (IS_ERR(buf)) { + dev_err(indio_dev->dev.parent, + "failed to read temperature_calib cell\n"); + return PTR_ERR(buf); + } else if (read_len != MESON_SAR_ADC_EFUSE_BYTES) { + kfree(buf); + dev_err(indio_dev->dev.parent, + "invalid read size of temperature_calib cell\n"); + return -EINVAL; + } + + trimming_bits = priv->param->temperature_trimming_bits; + trimming_mask = BIT(trimming_bits) - 1; + + priv->temperature_sensor_calibrated = + buf[3] & MESON_SAR_ADC_EFUSE_BYTE3_IS_CALIBRATED; + priv->temperature_sensor_coefficient = buf[2] & trimming_mask; + + upper_adc_val = FIELD_GET(MESON_SAR_ADC_EFUSE_BYTE3_UPPER_ADC_VAL, + buf[3]); + + priv->temperature_sensor_adc_val = buf[2]; + priv->temperature_sensor_adc_val |= upper_adc_val << BITS_PER_BYTE; + priv->temperature_sensor_adc_val >>= trimming_bits; + + kfree(buf); + + return 0; +} + +static int meson_sar_adc_init(struct iio_dev *indio_dev) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + int regval, i, ret; + + /* + * make sure we start at CH7 input since the other muxes are only used + * for internal calibration. + */ + meson_sar_adc_set_chan7_mux(indio_dev, CHAN7_MUX_CH7_INPUT); + + if (priv->param->has_bl30_integration) { + /* + * leave sampling delay and the input clocks as configured by + * BL30 to make sure BL30 gets the values it expects when + * reading the temperature sensor. + */ + regmap_read(priv->regmap, MESON_SAR_ADC_REG3, ®val); + if (regval & MESON_SAR_ADC_REG3_BL30_INITIALIZED) + return 0; + } + + meson_sar_adc_stop_sample_engine(indio_dev); + + /* + * disable this bit as seems to be only relevant for Meson6 (based + * on the vendor driver), which we don't support at the moment. + */ + regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0, + MESON_SAR_ADC_REG0_ADC_TEMP_SEN_SEL, 0); + + /* disable all channels by default */ + regmap_write(priv->regmap, MESON_SAR_ADC_CHAN_LIST, 0x0); + + regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3, + MESON_SAR_ADC_REG3_CTRL_SAMPLING_CLOCK_PHASE, 0); + regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3, + MESON_SAR_ADC_REG3_CNTL_USE_SC_DLY, + MESON_SAR_ADC_REG3_CNTL_USE_SC_DLY); + + /* delay between two samples = (10+1) * 1uS */ + regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY, + MESON_SAR_ADC_DELAY_INPUT_DLY_CNT_MASK, + FIELD_PREP(MESON_SAR_ADC_DELAY_SAMPLE_DLY_CNT_MASK, + 10)); + regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY, + MESON_SAR_ADC_DELAY_SAMPLE_DLY_SEL_MASK, + FIELD_PREP(MESON_SAR_ADC_DELAY_SAMPLE_DLY_SEL_MASK, + 0)); + + /* delay between two samples = (10+1) * 1uS */ + regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY, + MESON_SAR_ADC_DELAY_INPUT_DLY_CNT_MASK, + FIELD_PREP(MESON_SAR_ADC_DELAY_INPUT_DLY_CNT_MASK, + 10)); + regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY, + MESON_SAR_ADC_DELAY_INPUT_DLY_SEL_MASK, + FIELD_PREP(MESON_SAR_ADC_DELAY_INPUT_DLY_SEL_MASK, + 1)); + + /* + * set up the input channel muxes in MESON_SAR_ADC_CHAN_10_SW + * (0 = SAR_ADC_CH0, 1 = SAR_ADC_CH1) + */ + regval = FIELD_PREP(MESON_SAR_ADC_CHAN_10_SW_CHAN0_MUX_SEL_MASK, 0); + regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_10_SW, + MESON_SAR_ADC_CHAN_10_SW_CHAN0_MUX_SEL_MASK, + regval); + regval = FIELD_PREP(MESON_SAR_ADC_CHAN_10_SW_CHAN1_MUX_SEL_MASK, 1); + regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_10_SW, + MESON_SAR_ADC_CHAN_10_SW_CHAN1_MUX_SEL_MASK, + regval); + + /* + * set up the input channel muxes in MESON_SAR_ADC_AUX_SW + * (2 = SAR_ADC_CH2, 3 = SAR_ADC_CH3, ...) and enable + * MESON_SAR_ADC_AUX_SW_YP_DRIVE_SW and + * MESON_SAR_ADC_AUX_SW_XP_DRIVE_SW like the vendor driver. + */ + regval = 0; + for (i = 2; i <= 7; i++) + regval |= i << MESON_SAR_ADC_AUX_SW_MUX_SEL_CHAN_SHIFT(i); + regval |= MESON_SAR_ADC_AUX_SW_YP_DRIVE_SW; + regval |= MESON_SAR_ADC_AUX_SW_XP_DRIVE_SW; + regmap_write(priv->regmap, MESON_SAR_ADC_AUX_SW, regval); + + if (priv->temperature_sensor_calibrated) { + regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELTA_10, + MESON_SAR_ADC_DELTA_10_TS_REVE1, + MESON_SAR_ADC_DELTA_10_TS_REVE1); + regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELTA_10, + MESON_SAR_ADC_DELTA_10_TS_REVE0, + MESON_SAR_ADC_DELTA_10_TS_REVE0); + + /* + * set bits [3:0] of the TSC (temperature sensor coefficient) + * to get the correct values when reading the temperature. + */ + regval = FIELD_PREP(MESON_SAR_ADC_DELTA_10_TS_C_MASK, + priv->temperature_sensor_coefficient); + regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELTA_10, + MESON_SAR_ADC_DELTA_10_TS_C_MASK, regval); + + if (priv->param->temperature_trimming_bits == 5) { + if (priv->temperature_sensor_coefficient & BIT(4)) + regval = MESON_HHI_DPLL_TOP_0_TSC_BIT4; + else + regval = 0; + + /* + * bit [4] (the 5th bit when starting to count at 1) + * of the TSC is located in the HHI register area. + */ + regmap_update_bits(priv->tsc_regmap, + MESON_HHI_DPLL_TOP_0, + MESON_HHI_DPLL_TOP_0_TSC_BIT4, + regval); + } + } else { + regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELTA_10, + MESON_SAR_ADC_DELTA_10_TS_REVE1, 0); + regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELTA_10, + MESON_SAR_ADC_DELTA_10_TS_REVE0, 0); + } + + ret = clk_set_parent(priv->adc_sel_clk, priv->clkin); + if (ret) { + dev_err(indio_dev->dev.parent, + "failed to set adc parent to clkin\n"); + return ret; + } + + ret = clk_set_rate(priv->adc_clk, priv->param->clock_rate); + if (ret) { + dev_err(indio_dev->dev.parent, + "failed to set adc clock rate\n"); + return ret; + } + + return 0; +} + +static void meson_sar_adc_set_bandgap(struct iio_dev *indio_dev, bool on_off) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + const struct meson_sar_adc_param *param = priv->param; + u32 enable_mask; + + if (param->bandgap_reg == MESON_SAR_ADC_REG11) + enable_mask = MESON_SAR_ADC_REG11_BANDGAP_EN; + else + enable_mask = MESON_SAR_ADC_DELTA_10_TS_VBG_EN; + + regmap_update_bits(priv->regmap, param->bandgap_reg, enable_mask, + on_off ? enable_mask : 0); +} + +static int meson_sar_adc_hw_enable(struct iio_dev *indio_dev) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + int ret; + u32 regval; + + ret = meson_sar_adc_lock(indio_dev); + if (ret) + goto err_lock; + + ret = regulator_enable(priv->vref); + if (ret < 0) { + dev_err(indio_dev->dev.parent, + "failed to enable vref regulator\n"); + goto err_vref; + } + + ret = clk_prepare_enable(priv->core_clk); + if (ret) { + dev_err(indio_dev->dev.parent, "failed to enable core clk\n"); + goto err_core_clk; + } + + regval = FIELD_PREP(MESON_SAR_ADC_REG0_FIFO_CNT_IRQ_MASK, 1); + regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0, + MESON_SAR_ADC_REG0_FIFO_CNT_IRQ_MASK, regval); + + meson_sar_adc_set_bandgap(indio_dev, true); + + regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3, + MESON_SAR_ADC_REG3_ADC_EN, + MESON_SAR_ADC_REG3_ADC_EN); + + udelay(5); + + ret = clk_prepare_enable(priv->adc_clk); + if (ret) { + dev_err(indio_dev->dev.parent, "failed to enable adc clk\n"); + goto err_adc_clk; + } + + meson_sar_adc_unlock(indio_dev); + + return 0; + +err_adc_clk: + regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3, + MESON_SAR_ADC_REG3_ADC_EN, 0); + meson_sar_adc_set_bandgap(indio_dev, false); + clk_disable_unprepare(priv->core_clk); +err_core_clk: + regulator_disable(priv->vref); +err_vref: + meson_sar_adc_unlock(indio_dev); +err_lock: + return ret; +} + +static int meson_sar_adc_hw_disable(struct iio_dev *indio_dev) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + int ret; + + ret = meson_sar_adc_lock(indio_dev); + if (ret) + return ret; + + clk_disable_unprepare(priv->adc_clk); + + regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3, + MESON_SAR_ADC_REG3_ADC_EN, 0); + + meson_sar_adc_set_bandgap(indio_dev, false); + + clk_disable_unprepare(priv->core_clk); + + regulator_disable(priv->vref); + + meson_sar_adc_unlock(indio_dev); + + return 0; +} + +static irqreturn_t meson_sar_adc_irq(int irq, void *data) +{ + struct iio_dev *indio_dev = data; + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + unsigned int cnt, threshold; + u32 regval; + + regmap_read(priv->regmap, MESON_SAR_ADC_REG0, ®val); + cnt = FIELD_GET(MESON_SAR_ADC_REG0_FIFO_COUNT_MASK, regval); + threshold = FIELD_GET(MESON_SAR_ADC_REG0_FIFO_CNT_IRQ_MASK, regval); + + if (cnt < threshold) + return IRQ_NONE; + + complete(&priv->done); + + return IRQ_HANDLED; +} + +static int meson_sar_adc_calib(struct iio_dev *indio_dev) +{ + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + int ret, nominal0, nominal1, value0, value1; + + /* use points 25% and 75% for calibration */ + nominal0 = (1 << priv->param->resolution) / 4; + nominal1 = (1 << priv->param->resolution) * 3 / 4; + + meson_sar_adc_set_chan7_mux(indio_dev, CHAN7_MUX_VDD_DIV4); + usleep_range(10, 20); + ret = meson_sar_adc_get_sample(indio_dev, + &indio_dev->channels[7], + MEAN_AVERAGING, EIGHT_SAMPLES, &value0); + if (ret < 0) + goto out; + + meson_sar_adc_set_chan7_mux(indio_dev, CHAN7_MUX_VDD_MUL3_DIV4); + usleep_range(10, 20); + ret = meson_sar_adc_get_sample(indio_dev, + &indio_dev->channels[7], + MEAN_AVERAGING, EIGHT_SAMPLES, &value1); + if (ret < 0) + goto out; + + if (value1 <= value0) { + ret = -EINVAL; + goto out; + } + + priv->calibscale = div_s64((nominal1 - nominal0) * (s64)MILLION, + value1 - value0); + priv->calibbias = nominal0 - div_s64((s64)value0 * priv->calibscale, + MILLION); + ret = 0; +out: + meson_sar_adc_set_chan7_mux(indio_dev, CHAN7_MUX_CH7_INPUT); + + return ret; +} + +static const struct iio_info meson_sar_adc_iio_info = { + .read_raw = meson_sar_adc_iio_info_read_raw, +}; + +static const struct meson_sar_adc_param meson_sar_adc_meson8_param = { + .has_bl30_integration = false, + .clock_rate = 1150000, + .bandgap_reg = MESON_SAR_ADC_DELTA_10, + .regmap_config = &meson_sar_adc_regmap_config_meson8, + .resolution = 10, + .temperature_trimming_bits = 4, + .temperature_multiplier = 18 * 10000, + .temperature_divider = 1024 * 10 * 85, +}; + +static const struct meson_sar_adc_param meson_sar_adc_meson8b_param = { + .has_bl30_integration = false, + .clock_rate = 1150000, + .bandgap_reg = MESON_SAR_ADC_DELTA_10, + .regmap_config = &meson_sar_adc_regmap_config_meson8, + .resolution = 10, + .temperature_trimming_bits = 5, + .temperature_multiplier = 10, + .temperature_divider = 32, +}; + +static const struct meson_sar_adc_param meson_sar_adc_gxbb_param = { + .has_bl30_integration = true, + .clock_rate = 1200000, + .bandgap_reg = MESON_SAR_ADC_REG11, + .regmap_config = &meson_sar_adc_regmap_config_gxbb, + .resolution = 10, +}; + +static const struct meson_sar_adc_param meson_sar_adc_gxl_param = { + .has_bl30_integration = true, + .clock_rate = 1200000, + .bandgap_reg = MESON_SAR_ADC_REG11, + .regmap_config = &meson_sar_adc_regmap_config_gxbb, + .resolution = 12, +}; + +static const struct meson_sar_adc_data meson_sar_adc_meson8_data = { + .param = &meson_sar_adc_meson8_param, + .name = "meson-meson8-saradc", +}; + +static const struct meson_sar_adc_data meson_sar_adc_meson8b_data = { + .param = &meson_sar_adc_meson8b_param, + .name = "meson-meson8b-saradc", +}; + +static const struct meson_sar_adc_data meson_sar_adc_meson8m2_data = { + .param = &meson_sar_adc_meson8b_param, + .name = "meson-meson8m2-saradc", +}; + +static const struct meson_sar_adc_data meson_sar_adc_gxbb_data = { + .param = &meson_sar_adc_gxbb_param, + .name = "meson-gxbb-saradc", +}; + +static const struct meson_sar_adc_data meson_sar_adc_gxl_data = { + .param = &meson_sar_adc_gxl_param, + .name = "meson-gxl-saradc", +}; + +static const struct meson_sar_adc_data meson_sar_adc_gxm_data = { + .param = &meson_sar_adc_gxl_param, + .name = "meson-gxm-saradc", +}; + +static const struct meson_sar_adc_data meson_sar_adc_axg_data = { + .param = &meson_sar_adc_gxl_param, + .name = "meson-axg-saradc", +}; + +static const struct meson_sar_adc_data meson_sar_adc_g12a_data = { + .param = &meson_sar_adc_gxl_param, + .name = "meson-g12a-saradc", +}; + +static const struct of_device_id meson_sar_adc_of_match[] = { + { + .compatible = "amlogic,meson8-saradc", + .data = &meson_sar_adc_meson8_data, + }, { + .compatible = "amlogic,meson8b-saradc", + .data = &meson_sar_adc_meson8b_data, + }, { + .compatible = "amlogic,meson8m2-saradc", + .data = &meson_sar_adc_meson8m2_data, + }, { + .compatible = "amlogic,meson-gxbb-saradc", + .data = &meson_sar_adc_gxbb_data, + }, { + .compatible = "amlogic,meson-gxl-saradc", + .data = &meson_sar_adc_gxl_data, + }, { + .compatible = "amlogic,meson-gxm-saradc", + .data = &meson_sar_adc_gxm_data, + }, { + .compatible = "amlogic,meson-axg-saradc", + .data = &meson_sar_adc_axg_data, + }, { + .compatible = "amlogic,meson-g12a-saradc", + .data = &meson_sar_adc_g12a_data, + }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, meson_sar_adc_of_match); + +static int meson_sar_adc_probe(struct platform_device *pdev) +{ + const struct meson_sar_adc_data *match_data; + struct meson_sar_adc_priv *priv; + struct iio_dev *indio_dev; + void __iomem *base; + int irq, ret; + + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*priv)); + if (!indio_dev) { + dev_err(&pdev->dev, "failed allocating iio device\n"); + return -ENOMEM; + } + + priv = iio_priv(indio_dev); + init_completion(&priv->done); + + match_data = of_device_get_match_data(&pdev->dev); + if (!match_data) { + dev_err(&pdev->dev, "failed to get match data\n"); + return -ENODEV; + } + + priv->param = match_data->param; + + indio_dev->name = match_data->name; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->info = &meson_sar_adc_iio_info; + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + priv->regmap = devm_regmap_init_mmio(&pdev->dev, base, + priv->param->regmap_config); + if (IS_ERR(priv->regmap)) + return PTR_ERR(priv->regmap); + + irq = irq_of_parse_and_map(pdev->dev.of_node, 0); + if (!irq) + return -EINVAL; + + ret = devm_request_irq(&pdev->dev, irq, meson_sar_adc_irq, IRQF_SHARED, + dev_name(&pdev->dev), indio_dev); + if (ret) + return ret; + + priv->clkin = devm_clk_get(&pdev->dev, "clkin"); + if (IS_ERR(priv->clkin)) { + dev_err(&pdev->dev, "failed to get clkin\n"); + return PTR_ERR(priv->clkin); + } + + priv->core_clk = devm_clk_get(&pdev->dev, "core"); + if (IS_ERR(priv->core_clk)) { + dev_err(&pdev->dev, "failed to get core clk\n"); + return PTR_ERR(priv->core_clk); + } + + priv->adc_clk = devm_clk_get(&pdev->dev, "adc_clk"); + if (IS_ERR(priv->adc_clk)) { + if (PTR_ERR(priv->adc_clk) == -ENOENT) { + priv->adc_clk = NULL; + } else { + dev_err(&pdev->dev, "failed to get adc clk\n"); + return PTR_ERR(priv->adc_clk); + } + } + + priv->adc_sel_clk = devm_clk_get(&pdev->dev, "adc_sel"); + if (IS_ERR(priv->adc_sel_clk)) { + if (PTR_ERR(priv->adc_sel_clk) == -ENOENT) { + priv->adc_sel_clk = NULL; + } else { + dev_err(&pdev->dev, "failed to get adc_sel clk\n"); + return PTR_ERR(priv->adc_sel_clk); + } + } + + /* on pre-GXBB SoCs the SAR ADC itself provides the ADC clock: */ + if (!priv->adc_clk) { + ret = meson_sar_adc_clk_init(indio_dev, base); + if (ret) + return ret; + } + + priv->vref = devm_regulator_get(&pdev->dev, "vref"); + if (IS_ERR(priv->vref)) { + dev_err(&pdev->dev, "failed to get vref regulator\n"); + return PTR_ERR(priv->vref); + } + + priv->calibscale = MILLION; + + if (priv->param->temperature_trimming_bits) { + ret = meson_sar_adc_temp_sensor_init(indio_dev); + if (ret) + return ret; + } + + if (priv->temperature_sensor_calibrated) { + indio_dev->channels = meson_sar_adc_and_temp_iio_channels; + indio_dev->num_channels = + ARRAY_SIZE(meson_sar_adc_and_temp_iio_channels); + } else { + indio_dev->channels = meson_sar_adc_iio_channels; + indio_dev->num_channels = + ARRAY_SIZE(meson_sar_adc_iio_channels); + } + + ret = meson_sar_adc_init(indio_dev); + if (ret) + goto err; + + ret = meson_sar_adc_hw_enable(indio_dev); + if (ret) + goto err; + + ret = meson_sar_adc_calib(indio_dev); + if (ret) + dev_warn(&pdev->dev, "calibration failed\n"); + + platform_set_drvdata(pdev, indio_dev); + + ret = iio_device_register(indio_dev); + if (ret) + goto err_hw; + + return 0; + +err_hw: + meson_sar_adc_hw_disable(indio_dev); +err: + return ret; +} + +static int meson_sar_adc_remove(struct platform_device *pdev) +{ + struct iio_dev *indio_dev = platform_get_drvdata(pdev); + + iio_device_unregister(indio_dev); + + return meson_sar_adc_hw_disable(indio_dev); +} + +static int __maybe_unused meson_sar_adc_suspend(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + + return meson_sar_adc_hw_disable(indio_dev); +} + +static int __maybe_unused meson_sar_adc_resume(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + + return meson_sar_adc_hw_enable(indio_dev); +} + +static SIMPLE_DEV_PM_OPS(meson_sar_adc_pm_ops, + meson_sar_adc_suspend, meson_sar_adc_resume); + +static struct platform_driver meson_sar_adc_driver = { + .probe = meson_sar_adc_probe, + .remove = meson_sar_adc_remove, + .driver = { + .name = "meson-saradc", + .of_match_table = meson_sar_adc_of_match, + .pm = &meson_sar_adc_pm_ops, + }, +}; + +module_platform_driver(meson_sar_adc_driver); + +MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>"); +MODULE_DESCRIPTION("Amlogic Meson SAR ADC driver"); +MODULE_LICENSE("GPL v2"); |