| // 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/mutex.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 5 |
| #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; |
| /* lock to protect against multiple access to the device */ |
| struct mutex lock; |
| 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 val; |
| |
| /* |
| * 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). |
| */ |
| udelay(1); |
| return regmap_read_poll_timeout_atomic(priv->regmap, MESON_SAR_ADC_REG0, val, |
| !FIELD_GET(MESON_SAR_ADC_REG0_BUSY_MASK, val), |
| 1, 10000); |
| } |
| |
| 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); |
| struct device *dev = indio_dev->dev.parent; |
| 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(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(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, ret; |
| |
| mutex_lock(&priv->lock); |
| |
| 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); |
| |
| udelay(1); |
| |
| /* |
| * wait until BL30 releases it's lock (so we can use the SAR |
| * ADC) |
| */ |
| ret = regmap_read_poll_timeout_atomic(priv->regmap, MESON_SAR_ADC_DELAY, val, |
| !(val & MESON_SAR_ADC_DELAY_BL30_BUSY), |
| 1, 10000); |
| if (ret) { |
| mutex_unlock(&priv->lock); |
| return ret; |
| } |
| } |
| |
| 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(&priv->lock); |
| } |
| |
| 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); |
| struct device *dev = indio_dev->dev.parent; |
| 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(dev, "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); |
| struct device *dev = indio_dev->dev.parent; |
| int ret; |
| |
| switch (mask) { |
| case IIO_CHAN_INFO_RAW: |
| return meson_sar_adc_get_sample(indio_dev, chan, NO_AVERAGING, |
| ONE_SAMPLE, val); |
| |
| case IIO_CHAN_INFO_AVERAGE_RAW: |
| return meson_sar_adc_get_sample(indio_dev, chan, |
| MEAN_AVERAGING, EIGHT_SAMPLES, |
| val); |
| |
| case IIO_CHAN_INFO_SCALE: |
| if (chan->type == IIO_VOLTAGE) { |
| ret = regulator_get_voltage(priv->vref); |
| if (ret < 0) { |
| dev_err(dev, "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 device *dev = indio_dev->dev.parent; |
| struct clk_init_data init; |
| const char *clk_parents[1]; |
| |
| init.name = devm_kasprintf(dev, GFP_KERNEL, "%s#adc_div", dev_name(dev)); |
| 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(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(dev, GFP_KERNEL, "%s#adc_en", dev_name(dev)); |
| 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(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 device *dev = indio_dev->dev.parent; |
| struct nvmem_cell *temperature_calib; |
| size_t read_len; |
| int ret; |
| |
| temperature_calib = devm_nvmem_cell_get(dev, "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(dev, ret, "failed to get temperature_calib cell\n"); |
| } |
| |
| priv->tsc_regmap = syscon_regmap_lookup_by_phandle(dev->of_node, "amlogic,hhi-sysctrl"); |
| if (IS_ERR(priv->tsc_regmap)) |
| return dev_err_probe(dev, PTR_ERR(priv->tsc_regmap), |
| "failed to get amlogic,hhi-sysctrl regmap\n"); |
| |
| read_len = MESON_SAR_ADC_EFUSE_BYTES; |
| buf = nvmem_cell_read(temperature_calib, &read_len); |
| if (IS_ERR(buf)) |
| return dev_err_probe(dev, PTR_ERR(buf), "failed to read temperature_calib cell\n"); |
| if (read_len != MESON_SAR_ADC_EFUSE_BYTES) { |
| kfree(buf); |
| return dev_err_probe(dev, -EINVAL, "invalid read size of temperature_calib cell\n"); |
| } |
| |
| 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); |
| struct device *dev = indio_dev->dev.parent; |
| 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) |
| return dev_err_probe(dev, ret, "failed to set adc parent to clkin\n"); |
| |
| ret = clk_set_rate(priv->adc_clk, priv->param->clock_rate); |
| if (ret) |
| return dev_err_probe(dev, ret, "failed to set adc clock rate\n"); |
| |
| 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); |
| struct device *dev = indio_dev->dev.parent; |
| 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(dev, "failed to enable vref regulator\n"); |
| goto err_vref; |
| } |
| |
| ret = clk_prepare_enable(priv->core_clk); |
| if (ret) { |
| dev_err(dev, "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(dev, "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_param meson_sar_adc_g12a_param = { |
| .has_bl30_integration = false, |
| .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_g12a_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 device *dev = &pdev->dev; |
| struct iio_dev *indio_dev; |
| void __iomem *base; |
| int irq, ret; |
| |
| indio_dev = devm_iio_device_alloc(dev, sizeof(*priv)); |
| if (!indio_dev) |
| return dev_err_probe(dev, -ENOMEM, "failed allocating iio device\n"); |
| |
| priv = iio_priv(indio_dev); |
| init_completion(&priv->done); |
| |
| match_data = of_device_get_match_data(dev); |
| if (!match_data) |
| return dev_err_probe(dev, -ENODEV, "failed to get match data\n"); |
| |
| 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(dev, base, priv->param->regmap_config); |
| if (IS_ERR(priv->regmap)) |
| return PTR_ERR(priv->regmap); |
| |
| irq = irq_of_parse_and_map(dev->of_node, 0); |
| if (!irq) |
| return -EINVAL; |
| |
| ret = devm_request_irq(dev, irq, meson_sar_adc_irq, IRQF_SHARED, dev_name(dev), indio_dev); |
| if (ret) |
| return ret; |
| |
| priv->clkin = devm_clk_get(dev, "clkin"); |
| if (IS_ERR(priv->clkin)) |
| return dev_err_probe(dev, PTR_ERR(priv->clkin), "failed to get clkin\n"); |
| |
| priv->core_clk = devm_clk_get(dev, "core"); |
| if (IS_ERR(priv->core_clk)) |
| return dev_err_probe(dev, PTR_ERR(priv->core_clk), "failed to get core clk\n"); |
| |
| priv->adc_clk = devm_clk_get_optional(dev, "adc_clk"); |
| if (IS_ERR(priv->adc_clk)) |
| return dev_err_probe(dev, PTR_ERR(priv->adc_clk), "failed to get adc clk\n"); |
| |
| priv->adc_sel_clk = devm_clk_get_optional(dev, "adc_sel"); |
| if (IS_ERR(priv->adc_sel_clk)) |
| return dev_err_probe(dev, PTR_ERR(priv->adc_sel_clk), "failed to get adc_sel clk\n"); |
| |
| /* 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(dev, "vref"); |
| if (IS_ERR(priv->vref)) |
| return dev_err_probe(dev, PTR_ERR(priv->vref), "failed to get vref regulator\n"); |
| |
| 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; |
| |
| mutex_init(&priv->lock); |
| |
| ret = meson_sar_adc_hw_enable(indio_dev); |
| if (ret) |
| goto err; |
| |
| ret = meson_sar_adc_calib(indio_dev); |
| if (ret) |
| dev_warn(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 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 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 DEFINE_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 = pm_sleep_ptr(&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"); |