| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Martin Blumenstingl | 4510 | 71.84% | 19 | 34.55% |
| George Stark | 828 | 13.19% | 11 | 20.00% |
| Heiner Kallweit | 512 | 8.16% | 3 | 5.45% |
| Andy Shevchenko | 137 | 2.18% | 6 | 10.91% |
| Yixun Lan | 78 | 1.24% | 1 | 1.82% |
| Neil Armstrong | 29 | 0.46% | 2 | 3.64% |
| Uwe Kleine-König | 28 | 0.45% | 2 | 3.64% |
| Xingyu Chen | 22 | 0.35% | 1 | 1.82% |
| Remi Pommarel | 22 | 0.35% | 1 | 1.82% |
| Nuno Sá | 22 | 0.35% | 1 | 1.82% |
| Nicholas Mc Guire | 22 | 0.35% | 1 | 1.82% |
| Trevor Gamblin | 22 | 0.35% | 1 | 1.82% |
| caihuoqing | 16 | 0.25% | 1 | 1.82% |
| Gustavo A. R. Silva | 12 | 0.19% | 1 | 1.82% |
| Dan Carpenter | 8 | 0.13% | 1 | 1.82% |
| Jonathan Cameron | 6 | 0.10% | 2 | 3.64% |
| Krzysztof Kozlowski | 4 | 0.06% | 1 | 1.82% |
| Total | 6278 | 55 |
// 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/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_REG11_CMV_SEL BIT(6) #define MESON_SAR_ADC_REG11_VREF_VOLTAGE BIT(5) #define MESON_SAR_ADC_REG11_EOC BIT(1) #define MESON_SAR_ADC_REG11_VREF_SEL BIT(0) #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_VOLTAGE_AND_MUX_CHANNEL 7 #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", \ } #define MESON_SAR_ADC_MUX(_chan, _sel) { \ .type = IIO_VOLTAGE, \ .channel = _chan, \ .indexed = 1, \ .address = MESON_SAR_ADC_VOLTAGE_AND_MUX_CHANNEL, \ .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_MUX_"#_sel, \ } enum meson_sar_adc_vref_sel { VREF_CALIBATION_VOLTAGE = 0, VREF_VDDA = 1, }; 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, }; enum meson_sar_adc_channel_index { NUM_CHAN_0, NUM_CHAN_1, NUM_CHAN_2, NUM_CHAN_3, NUM_CHAN_4, NUM_CHAN_5, NUM_CHAN_6, NUM_CHAN_7, NUM_CHAN_TEMP, NUM_MUX_0_VSS, NUM_MUX_1_VDD_DIV4, NUM_MUX_2_VDD_DIV2, NUM_MUX_3_VDD_MUL3_DIV4, NUM_MUX_4_VDD, }; static enum meson_sar_adc_chan7_mux_sel chan7_mux_values[] = { CHAN7_MUX_VSS, CHAN7_MUX_VDD_DIV4, CHAN7_MUX_VDD_DIV2, CHAN7_MUX_VDD_MUL3_DIV4, CHAN7_MUX_VDD, }; static const char * const chan7_mux_names[] = { [CHAN7_MUX_VSS] = "gnd", [CHAN7_MUX_VDD_DIV4] = "0.25vdd", [CHAN7_MUX_VDD_DIV2] = "0.5vdd", [CHAN7_MUX_VDD_MUL3_DIV4] = "0.75vdd", [CHAN7_MUX_VDD] = "vdd", }; static const struct iio_chan_spec meson_sar_adc_iio_channels[] = { MESON_SAR_ADC_CHAN(NUM_CHAN_0), MESON_SAR_ADC_CHAN(NUM_CHAN_1), MESON_SAR_ADC_CHAN(NUM_CHAN_2), MESON_SAR_ADC_CHAN(NUM_CHAN_3), MESON_SAR_ADC_CHAN(NUM_CHAN_4), MESON_SAR_ADC_CHAN(NUM_CHAN_5), MESON_SAR_ADC_CHAN(NUM_CHAN_6), MESON_SAR_ADC_CHAN(NUM_CHAN_7), MESON_SAR_ADC_MUX(NUM_MUX_0_VSS, 0), MESON_SAR_ADC_MUX(NUM_MUX_1_VDD_DIV4, 1), MESON_SAR_ADC_MUX(NUM_MUX_2_VDD_DIV2, 2), MESON_SAR_ADC_MUX(NUM_MUX_3_VDD_MUL3_DIV4, 3), MESON_SAR_ADC_MUX(NUM_MUX_4_VDD, 4), }; static const struct iio_chan_spec meson_sar_adc_and_temp_iio_channels[] = { MESON_SAR_ADC_CHAN(NUM_CHAN_0), MESON_SAR_ADC_CHAN(NUM_CHAN_1), MESON_SAR_ADC_CHAN(NUM_CHAN_2), MESON_SAR_ADC_CHAN(NUM_CHAN_3), MESON_SAR_ADC_CHAN(NUM_CHAN_4), MESON_SAR_ADC_CHAN(NUM_CHAN_5), MESON_SAR_ADC_CHAN(NUM_CHAN_6), MESON_SAR_ADC_CHAN(NUM_CHAN_7), MESON_SAR_ADC_TEMP_CHAN(NUM_CHAN_TEMP), MESON_SAR_ADC_MUX(NUM_MUX_0_VSS, 0), MESON_SAR_ADC_MUX(NUM_MUX_1_VDD_DIV4, 1), MESON_SAR_ADC_MUX(NUM_MUX_2_VDD_DIV2, 2), MESON_SAR_ADC_MUX(NUM_MUX_3_VDD_MUL3_DIV4, 3), MESON_SAR_ADC_MUX(NUM_MUX_4_VDD, 4), }; 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; u8 disable_ring_counter; bool has_reg11; bool has_vref_select; u8 vref_select; u8 cmv_select; u8 adc_eoc; enum meson_sar_adc_vref_sel vref_volatge; }; 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; enum meson_sar_adc_chan7_mux_sel chan7_mux_sel; }; 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 const struct iio_chan_spec * find_channel_by_num(struct iio_dev *indio_dev, int num) { int i; for (i = 0; i < indio_dev->num_channels; i++) if (indio_dev->channels[i].channel == num) return &indio_dev->channels[i]; return NULL; } 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 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); priv->chan7_mux_sel = sel; } 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); } else if (chan->address == MESON_SAR_ADC_VOLTAGE_AND_MUX_CHANNEL) { enum meson_sar_adc_chan7_mux_sel sel; if (chan->channel == NUM_CHAN_7) sel = CHAN7_MUX_CH7_INPUT; else sel = chan7_mux_values[chan->channel - NUM_MUX_0_VSS]; if (sel != priv->chan7_mux_sel) meson_sar_adc_set_chan7_mux(indio_dev, sel); } } 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_set_bits(priv->regmap, MESON_SAR_ADC_REG0, MESON_SAR_ADC_REG0_FIFO_IRQ_EN); regmap_set_bits(priv->regmap, MESON_SAR_ADC_REG0, MESON_SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE); regmap_set_bits(priv->regmap, MESON_SAR_ADC_REG0, 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_clear_bits(priv->regmap, MESON_SAR_ADC_REG0, MESON_SAR_ADC_REG0_FIFO_IRQ_EN); regmap_set_bits(priv->regmap, MESON_SAR_ADC_REG0, MESON_SAR_ADC_REG0_SAMPLING_STOP); /* wait until all modules are stopped */ meson_sar_adc_wait_busy_clear(indio_dev); regmap_clear_bits(priv->regmap, MESON_SAR_ADC_REG0, MESON_SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE); } 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_set_bits(priv->regmap, MESON_SAR_ADC_DELAY, 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_clear_bits(priv->regmap, MESON_SAR_ADC_DELAY, MESON_SAR_ADC_DELAY_KERNEL_BUSY); 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_clear_bits(priv->regmap, MESON_SAR_ADC_REG0, MESON_SAR_ADC_REG0_ADC_TEMP_SEN_SEL); /* disable all channels by default */ regmap_write(priv->regmap, MESON_SAR_ADC_CHAN_LIST, 0x0); regmap_clear_bits(priv->regmap, MESON_SAR_ADC_REG3, MESON_SAR_ADC_REG3_CTRL_SAMPLING_CLOCK_PHASE); regmap_set_bits(priv->regmap, MESON_SAR_ADC_REG3, 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); regmap_set_bits(priv->regmap, MESON_SAR_ADC_CHAN_10_SW, MESON_SAR_ADC_CHAN_10_SW_CHAN0_XP_DRIVE_SW); regmap_set_bits(priv->regmap, MESON_SAR_ADC_CHAN_10_SW, MESON_SAR_ADC_CHAN_10_SW_CHAN0_YP_DRIVE_SW); regmap_set_bits(priv->regmap, MESON_SAR_ADC_CHAN_10_SW, MESON_SAR_ADC_CHAN_10_SW_CHAN1_XP_DRIVE_SW); regmap_set_bits(priv->regmap, MESON_SAR_ADC_CHAN_10_SW, MESON_SAR_ADC_CHAN_10_SW_CHAN1_YP_DRIVE_SW); /* * 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_set_bits(priv->regmap, MESON_SAR_ADC_DELTA_10, MESON_SAR_ADC_DELTA_10_TS_REVE1); regmap_set_bits(priv->regmap, MESON_SAR_ADC_DELTA_10, 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_clear_bits(priv->regmap, MESON_SAR_ADC_DELTA_10, MESON_SAR_ADC_DELTA_10_TS_REVE1); regmap_clear_bits(priv->regmap, MESON_SAR_ADC_DELTA_10, MESON_SAR_ADC_DELTA_10_TS_REVE0); } regval = FIELD_PREP(MESON_SAR_ADC_REG3_CTRL_CONT_RING_COUNTER_EN, priv->param->disable_ring_counter); regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3, MESON_SAR_ADC_REG3_CTRL_CONT_RING_COUNTER_EN, regval); if (priv->param->has_reg11) { regval = FIELD_PREP(MESON_SAR_ADC_REG11_EOC, priv->param->adc_eoc); regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG11, MESON_SAR_ADC_REG11_EOC, regval); if (priv->param->has_vref_select) { regval = FIELD_PREP(MESON_SAR_ADC_REG11_VREF_SEL, priv->param->vref_select); regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG11, MESON_SAR_ADC_REG11_VREF_SEL, regval); } regval = FIELD_PREP(MESON_SAR_ADC_REG11_VREF_VOLTAGE, priv->param->vref_volatge); regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG11, MESON_SAR_ADC_REG11_VREF_VOLTAGE, regval); regval = FIELD_PREP(MESON_SAR_ADC_REG11_CMV_SEL, priv->param->cmv_select); regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG11, MESON_SAR_ADC_REG11_CMV_SEL, regval); } 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) { dev_err(dev, "failed to lock adc\n"); goto err_lock; } ret = regulator_enable(priv->vref); if (ret < 0) { dev_err(dev, "failed to enable vref regulator\n"); goto err_vref; } 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_set_bits(priv->regmap, MESON_SAR_ADC_REG3, 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_clear_bits(priv->regmap, MESON_SAR_ADC_REG3, MESON_SAR_ADC_REG3_ADC_EN); meson_sar_adc_set_bandgap(indio_dev, false); regulator_disable(priv->vref); err_vref: meson_sar_adc_unlock(indio_dev); err_lock: return ret; } static void meson_sar_adc_hw_disable(struct iio_dev *indio_dev) { struct meson_sar_adc_priv *priv = iio_priv(indio_dev); int ret; /* * If taking the lock fails we have to assume that BL30 is broken. The * best we can do then is to release the resources anyhow. */ ret = meson_sar_adc_lock(indio_dev); if (ret) dev_err(indio_dev->dev.parent, "Failed to lock ADC (%pE)\n", ERR_PTR(ret)); clk_disable_unprepare(priv->adc_clk); regmap_clear_bits(priv->regmap, MESON_SAR_ADC_REG3, MESON_SAR_ADC_REG3_ADC_EN); meson_sar_adc_set_bandgap(indio_dev, false); regulator_disable(priv->vref); if (!ret) meson_sar_adc_unlock(indio_dev); } 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, find_channel_by_num(indio_dev, NUM_MUX_1_VDD_DIV4), 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, find_channel_by_num(indio_dev, NUM_MUX_3_VDD_MUL3_DIV4), 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 int read_label(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, char *label) { if (chan->type == IIO_TEMP) return sprintf(label, "temp-sensor\n"); if (chan->type == IIO_VOLTAGE && chan->channel >= NUM_MUX_0_VSS) return sprintf(label, "%s\n", chan7_mux_names[chan->channel - NUM_MUX_0_VSS]); if (chan->type == IIO_VOLTAGE) return sprintf(label, "channel-%d\n", chan->channel); return 0; } static const struct iio_info meson_sar_adc_iio_info = { .read_raw = meson_sar_adc_iio_info_read_raw, .read_label = read_label, }; 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, .has_reg11 = true, .vref_volatge = 1, .cmv_select = 1, }; 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, .disable_ring_counter = 1, .has_reg11 = true, .vref_volatge = 1, .cmv_select = 1, }; static const struct meson_sar_adc_param meson_sar_adc_axg_param = { .has_bl30_integration = true, .clock_rate = 1200000, .bandgap_reg = MESON_SAR_ADC_REG11, .regmap_config = &meson_sar_adc_regmap_config_gxbb, .resolution = 12, .disable_ring_counter = 1, .has_reg11 = true, .vref_volatge = 1, .has_vref_select = true, .vref_select = VREF_VDDA, .cmv_select = 1, }; 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, .disable_ring_counter = 1, .has_reg11 = true, .adc_eoc = 1, .has_vref_select = true, .vref_select = VREF_VDDA, }; 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_axg_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 dev_err_probe(dev, PTR_ERR(priv->regmap), "failed to init regmap\n"); irq = irq_of_parse_and_map(dev->of_node, 0); if (!irq) return dev_err_probe(dev, -EINVAL, "failed to get irq\n"); ret = devm_request_irq(dev, irq, meson_sar_adc_irq, IRQF_SHARED, dev_name(dev), indio_dev); if (ret) return dev_err_probe(dev, ret, "failed to request irq\n"); 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_enabled(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 dev_err_probe(dev, ret, "failed to init internal clk\n"); } 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) { dev_err_probe(dev, ret, "failed to register iio device\n"); goto err_hw; } return 0; err_hw: meson_sar_adc_hw_disable(indio_dev); err: return ret; } static void meson_sar_adc_remove(struct platform_device *pdev) { struct iio_dev *indio_dev = platform_get_drvdata(pdev); iio_device_unregister(indio_dev); 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); struct meson_sar_adc_priv *priv = iio_priv(indio_dev); meson_sar_adc_hw_disable(indio_dev); clk_disable_unprepare(priv->core_clk); return 0; } static int meson_sar_adc_resume(struct device *dev) { struct iio_dev *indio_dev = dev_get_drvdata(dev); struct meson_sar_adc_priv *priv = iio_priv(indio_dev); int ret; ret = clk_prepare_enable(priv->core_clk); if (ret) { dev_err(dev, "failed to enable core clk\n"); return ret; } 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_new = 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");
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