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nest-open-source / manifest_repos / kernel / 38bda478e46f3b6ec246861d597470685679add1 / . / drivers / iio / adc / meson_saradc.c
blob: a9fc23cc21a6d395b408b610438d7fded41ab03a [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* Amlogic Meson Successive Approximation Register (SAR) A/D Converter
*
* Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
*/
/*
* The sar adc is work in polling mode for single sampling, or work in IRQ mode
* for periodic sampling.
*/
#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>
#ifdef CONFIG_AMLOGIC_MODIFY
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include <linux/iio/kfifo_buf.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#endif
#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)
#ifdef CONFIG_AMLOGIC_MODIFY
#define MESON_SAR_ADC_CHAN_LIST_ENTRY_SHIFT(_chan) ((_chan) * 3)
#endif
#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
#ifdef CONFIG_AMLOGIC_MODIFY
#define MESON_SAR_ADC_REG3_ADC_CLK_DIV_WIDTH 6
#else
#define MESON_SAR_ADC_REG3_ADC_CLK_DIV_WIDTH 5
#endif
#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
#ifdef CONFIG_AMLOGIC_MODIFY
#define MESON_SAR_ADC_REG11_VREF_SEL BIT(0)
#define MESON_SAR_ADC_REG11_EOC BIT(1)
#define MESON_SAR_ADC_REG11_VREF_EN BIT(5)
#define MESON_SAR_ADC_REG11_CMV_SEL BIT(6)
#define MESON_SAR_ADC_REG11_TEMP_SEL BIT(21)
#define MESON_SAR_ADC_REG11_CHNL_REGS_EN BIT(30)
#define MESON_SAR_ADC_REG11_FIFO_EN BIT(31)
#endif
#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)
#ifdef CONFIG_AMLOGIC_MODIFY
/* NOTE: the registers below is introduced first on G12A platform */
#define MESON_SAR_ADC_CHNLX_BASE 0x38
#define MESON_SAR_ADC_CHNLX_SAMPLE_VALUE_SHIFT(_chan) \
((_chan) * 16)
#define MESON_SAR_ADC_CHNLX_ID_SHIFT(_chan) \
(12 + (_chan) * 16)
#define MESON_SAR_ADC_CHNLX_VALID_SHIFT(_chan) \
(15 + (_chan) * 16)
#define MESON_SAR_ADC_CHNL01 0x38
#define MESON_SAR_ADC_CHNL23 0x3c
#define MESON_SAR_ADC_CHNL45 0x40
#define MESON_SAR_ADC_CHNL67 0x44
#endif
#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
#ifdef CONFIG_AMLOGIC_MODIFY
#define MESON_SAR_ADC_PM_TIMEOUT 5000 /* ms */
#endif
/* 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 SAR_ADC_DEF_VREF 1800000 /* uV */
#ifdef CONFIG_AMLOGIC_MODIFY
#define MESON_SAR_ADC_CHAN(_chan) { \
.type = IIO_VOLTAGE, \
.indexed = 1, \
.channel = _chan, \
.address = _chan, \
.scan_index = _chan, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_AVERAGE_RAW) | \
BIT(IIO_CHAN_INFO_PROCESSED), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
.scan_type = { \
.sign = 'u', \
.storagebits = 16, \
.shift = 0, \
.endianness = IIO_CPU, \
}, \
.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), \
.datasheet_name = "TEMP_SENSOR", \
}
#else
#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", \
}
#endif
static 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 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),
};
#ifdef CONFIG_AMLOGIC_MODIFY
static const char * const chan7_vol[] = {
"gnd",
"vdd/4",
"vdd/2",
"vdd*3/4",
"vdd",
"ch7_input",
"ch7_input",
"ch7_input",
};
#endif
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,
};
#ifdef CONFIG_AMLOGIC_MODIFY
enum meson_sar_adc_vref_sel {
CALIB_VOL_AS_VREF = 0,
VDDA_AS_VREF = 1,
};
enum meson_sar_adc_sampling_mode {
SINGLE_MODE,
PERIOD_MODE,
MAX_MODE,
};
#endif
/* struct meson_sar_adc_param - describe the differences of different platform
*
* @has_bl30_integration: g12a and later SoCs don not use saradc to sample
* internal temp sensor in bl30
*
* @resolution: gxl and later: 12bit; others(gxtvbb etc): 10bit
*
* @vref_is_optional: txlx and later SoCs support VDDA or Calibration Voltage
* as vref, but others support only Calibration Voltage
*
* @disable_ring_counter: gxl and later SoCs write 1 to disable continuous ring
* counter, but others write 0
*
* @has_chnl_regs: enable period sampling mode when the SoCs contain chnl regs
*
* @vref_enable: g12a and later SoCs must write 0, others SoC write 1
*
* @cmv_select: g12a and later SoCs must write 0, others SoC write 1
*
* @adc_eoc: g12a and later SoCs must write 1
*
* @calib_enable: enable sw calibration, TXL and before SoCs must write true,
* other SoCs are optional.
*/
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;
#ifdef CONFIG_AMLOGIC_MODIFY
bool vref_is_optional;
bool disable_ring_counter;
bool has_chnl_regs;
bool vref_enable;
bool cmv_select;
bool adc_eoc;
bool calib_enable;
#endif
};
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;
#ifndef CONFIG_AMLOGIC_MODIFY
struct completion done;
#endif
int calibbias;
int calibscale;
struct regmap *tsc_regmap;
bool temperature_sensor_calibrated;
u8 temperature_sensor_coefficient;
u16 temperature_sensor_adc_val;
#ifdef CONFIG_AMLOGIC_MODIFY
int delay_per_tick;
int ticks_per_period;
int active_channel_cnt;
u8 *datum_buf;
u8 chan7_mux_sel;
#endif
};
#ifdef CONFIG_AMLOGIC_MODIFY
static const struct regmap_config meson_sar_adc_regmap_config_g12a = {
.reg_bits = 8,
.val_bits = 32,
.reg_stride = 4,
.max_register = MESON_SAR_ADC_CHNL67,
};
#endif
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,
};
#ifdef CONFIG_AMLOGIC_MODIFY
static bool meson_sar_adc_pm_runtime_supported(struct iio_dev *indio_dev)
{
struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
/* if the saradc is shared with bl30 it should't enable pm runtime */
if (priv->param->has_bl30_integration)
return false;
return true;
}
#endif
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, &regval);
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, &regval);
} 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;
#ifndef CONFIG_AMLOGIC_MODIFY
if(!wait_for_completion_timeout(&priv->done,
msecs_to_jiffies(MESON_SAR_ADC_TIMEOUT)))
return -ETIMEDOUT;
#else
if (meson_sar_adc_wait_busy_clear(indio_dev))
return -ETIMEDOUT;
#endif
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, &regval);
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);
#ifdef CONFIG_AMLOGIC_MODIFY
if (priv->param->calib_enable)
/* to fix the sample value by software */
*val = meson_sar_adc_calib_val(indio_dev, fifo_val);
else
*val = fifo_val;
#else
/* to fix the sample value by software */
*val = meson_sar_adc_calib_val(indio_dev, fifo_val);
#endif
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);
}
#ifdef CONFIG_AMLOGIC_MODIFY
static void meson_sar_adc_enable_channel(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
unsigned char idx)
{
struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
u32 regval;
regval = FIELD_PREP(MESON_SAR_ADC_CHAN_LIST_MAX_INDEX_MASK, idx);
regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_LIST,
MESON_SAR_ADC_CHAN_LIST_MAX_INDEX_MASK, regval);
regval = chan->channel << MESON_SAR_ADC_CHAN_LIST_ENTRY_SHIFT(idx);
regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_LIST,
MESON_SAR_ADC_CHAN_LIST_ENTRY_MASK(idx), 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
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);
}
}
#endif
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);
#ifdef CONFIG_AMLOGIC_MODIFY
priv->chan7_mux_sel = sel;
#endif
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);
#ifndef CONFIG_AMLOGIC_MODIFY
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);
#endif
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);
#ifndef CONFIG_AMLOGIC_MODIFY
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
MESON_SAR_ADC_REG0_FIFO_IRQ_EN, 0);
#endif
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);
#ifdef CONFIG_AMLOGIC_MODIFY
if (priv->param->has_bl30_integration) {
again:
/* 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;
}
/* 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);
isb();
dsb(sy);
udelay(5);
regmap_read(priv->regmap, MESON_SAR_ADC_DELAY, &val);
if (val & MESON_SAR_ADC_DELAY_BL30_BUSY)
goto again;
}
#else
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;
}
}
#endif
return 0;
}
static void meson_sar_adc_unlock(struct iio_dev *indio_dev)
{
struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
#ifdef CONFIG_AMLOGIC_MODIFY
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);
isb();
dsb(sy);
udelay(5);
}
#else
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);
#endif
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);
}
}
#ifdef CONFIG_AMLOGIC_MODIFY
static int
meson_sar_adc_read_raw_sample_from_chnl(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
int *val)
{
struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
unsigned int regval;
int grp_off;
int chan_off;
int fifo_chan;
int fifo_val;
bool is_valid;
grp_off = (chan->channel / 2) << 2;
chan_off = chan->channel % 2;
regmap_read(priv->regmap,
MESON_SAR_ADC_CHNLX_BASE + grp_off, &regval);
is_valid = (regval >> MESON_SAR_ADC_CHNLX_VALID_SHIFT(chan_off)) & 0x1;
if (!is_valid) {
dev_err(&indio_dev->dev,
"ADC chnl reg have no valid sampling data\n");
return -EINVAL;
}
fifo_chan = (regval >> MESON_SAR_ADC_CHNLX_ID_SHIFT(chan_off)) & 0x7;
if (fifo_chan != chan->channel) {
dev_err(&indio_dev->dev,
"ADC Dout entry belongs to channel %d instead of %d\n",
fifo_chan, chan->channel);
return -EINVAL;
}
fifo_val = regval >> MESON_SAR_ADC_CHNLX_SAMPLE_VALUE_SHIFT(chan_off);
fifo_val &= GENMASK(priv->param->resolution - 1, 0);
#ifdef CONFIG_AMLOGIC_MODIFY
if (priv->param->calib_enable)
/* to fix the sample value by software */
*val = meson_sar_adc_calib_val(indio_dev, fifo_val);
else
*val = fifo_val;
#else
/* to fix the sample value by software */
*val = meson_sar_adc_calib_val(indio_dev, fifo_val);
#endif
return 0;
}
#endif
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;
#ifdef CONFIG_AMLOGIC_MODIFY
if (iio_buffer_enabled(indio_dev)) {
ret = meson_sar_adc_read_raw_sample_from_chnl(indio_dev,
chan,
val);
meson_sar_adc_unlock(indio_dev);
return (ret == 0) ? IIO_VAL_INT : ret;
}
if (meson_sar_adc_pm_runtime_supported(indio_dev)) {
ret = pm_runtime_get_sync(indio_dev->dev.parent);
if (ret < 0) {
meson_sar_adc_unlock(indio_dev);
return ret;
}
}
#endif
/* 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);
#ifdef CONFIG_AMLOGIC_MODIFY
meson_sar_adc_enable_channel(indio_dev, chan, 0);
#else
meson_sar_adc_enable_channel(indio_dev, chan);
#endif
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);
#ifdef CONFIG_AMLOGIC_MODIFY
if (meson_sar_adc_pm_runtime_supported(indio_dev)) {
pm_runtime_mark_last_busy(indio_dev->dev.parent);
pm_runtime_put_autosuspend(indio_dev->dev.parent);
}
#endif
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;
#ifdef CONFIG_AMLOGIC_MODIFY
case IIO_CHAN_INFO_PROCESSED:
ret = meson_sar_adc_get_sample(indio_dev, chan,
MEAN_AVERAGING, EIGHT_SAMPLES,
val);
if (ret < 0)
return ret;
/* return the 10-bit sampling value */
if (priv->param->resolution == 12)
*val = *val >> 2;
return IIO_VAL_INT;
#endif
case IIO_CHAN_INFO_SCALE:
if (chan->type == IIO_VOLTAGE) {
ret = regulator_get_voltage(priv->vref);
if (ret < 0) {
/* use the default vref voltage */
ret = SAR_ADC_DEF_VREF;
}
*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:
#ifdef CONFIG_AMLOGIC_MODIFY
if (!priv->param->calib_enable)
return -EINVAL;
#endif
*val = priv->calibbias;
return IIO_VAL_INT;
case IIO_CHAN_INFO_CALIBSCALE:
#ifdef CONFIG_AMLOGIC_MODIFY
if (!priv->param->calib_enable)
return -EINVAL;
#endif
*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,
"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;
if (ret != -EPROBE_DEFER)
dev_err(indio_dev->dev.parent,
"failed to get temperature_calib cell\n");
return ret;
}
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;
}
#ifdef CONFIG_AMLOGIC_MODIFY
static int meson_sar_adc_uninit(struct iio_dev *indio_dev)
{
struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
clk_disable_unprepare(priv->core_clk);
return 0;
}
#endif
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;
#ifdef CONFIG_AMLOGIC_MODIFY
ret = clk_prepare_enable(priv->core_clk);
if (ret) {
dev_err(indio_dev->dev.parent, "failed to enable core clk\n");
return ret;
}
#else
/*
* 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);
#endif
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, &regval);
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);
#ifdef CONFIG_AMLOGIC_MODIFY
regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_10_SW,
MESON_SAR_ADC_CHAN_10_SW_CHAN0_XP_DRIVE_SW,
MESON_SAR_ADC_CHAN_10_SW_CHAN0_XP_DRIVE_SW);
regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_10_SW,
MESON_SAR_ADC_CHAN_10_SW_CHAN0_YP_DRIVE_SW,
MESON_SAR_ADC_CHAN_10_SW_CHAN0_YP_DRIVE_SW);
regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_10_SW,
MESON_SAR_ADC_CHAN_10_SW_CHAN1_XP_DRIVE_SW,
MESON_SAR_ADC_CHAN_10_SW_CHAN1_XP_DRIVE_SW);
regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_10_SW,
MESON_SAR_ADC_CHAN_10_SW_CHAN1_YP_DRIVE_SW,
MESON_SAR_ADC_CHAN_10_SW_CHAN1_YP_DRIVE_SW);
#endif
/*
* 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);
}
#ifdef CONFIG_AMLOGIC_MODIFY
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);
/* disable internal ring counter */
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);
/* to select the VDDA if the vref is optional */
regval = FIELD_PREP(MESON_SAR_ADC_REG11_VREF_SEL, VDDA_AS_VREF);
if (priv->param->vref_is_optional) {
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG11,
MESON_SAR_ADC_REG11_VREF_SEL, regval);
}
/* after g12a, select channel 6 input to external input */
if (priv->param->has_chnl_regs) {
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG11,
MESON_SAR_ADC_REG11_TEMP_SEL, 0);
}
#endif
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);
}
#ifdef CONFIG_AMLOGIC_MODIFY
static int meson_sar_adc_hw_enable_unlock(struct iio_dev *indio_dev)
{
struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
int ret;
ret = regulator_enable(priv->vref);
if (ret < 0) {
dev_err(indio_dev->dev.parent,
"failed to enable vref regulator\n");
goto err_vref;
}
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG11,
MESON_SAR_ADC_REG11_VREF_EN,
FIELD_PREP(MESON_SAR_ADC_REG11_VREF_EN,
priv->param->vref_enable));
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG11,
MESON_SAR_ADC_REG11_CMV_SEL,
FIELD_PREP(MESON_SAR_ADC_REG11_CMV_SEL,
priv->param->cmv_select));
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;
}
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);
regulator_disable(priv->vref);
err_vref:
return ret;
}
static int meson_sar_adc_hw_enable(struct iio_dev *indio_dev)
{
int ret;
ret = meson_sar_adc_lock(indio_dev);
if (ret)
return ret;
ret = meson_sar_adc_hw_enable_unlock(indio_dev);
meson_sar_adc_unlock(indio_dev);
return ret;
}
static int meson_sar_adc_hw_disable_unlock(struct iio_dev *indio_dev)
{
struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
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);
regulator_disable(priv->vref);
return 0;
}
static int meson_sar_adc_hw_disable(struct iio_dev *indio_dev)
{
int ret;
ret = meson_sar_adc_lock(indio_dev);
if (ret)
return ret;
meson_sar_adc_hw_disable_unlock(indio_dev);
meson_sar_adc_unlock(indio_dev);
return 0;
}
#else
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;
}
#endif
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, &regval);
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;
#ifndef CONFIG_AMLOGIC_MODIFY
complete(&priv->done);
return IRQ_HANDLED;
#else
return IRQ_WAKE_THREAD;
#endif
}
#ifdef CONFIG_AMLOGIC_MODIFY
static irqreturn_t meson_sar_adc_worker(int irq, void *data)
{
struct iio_dev *indio_dev = data;
struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
u16 fifo_cnt;
u16 fifo_val;
u32 regval;
u32 i = 0;
u32 j = 0;
fifo_cnt = meson_sar_adc_get_fifo_count(indio_dev);
for (j = 0; j < fifo_cnt; j = j + i) {
for (i = 0; i < priv->active_channel_cnt; i++) {
regmap_read(priv->regmap,
MESON_SAR_ADC_FIFO_RD, &regval);
fifo_val =
FIELD_GET(MESON_SAR_ADC_FIFO_RD_SAMPLE_VALUE_MASK,
regval);
fifo_val &= GENMASK(priv->param->resolution - 1, 0);
priv->datum_buf[i << 1] = fifo_val & 0xff;
priv->datum_buf[(i << 1) + 1] = (fifo_val >> 8) & 0xff;
}
iio_push_to_buffers_with_timestamp(indio_dev, priv->datum_buf,
iio_get_time_ns(indio_dev));
}
meson_sar_adc_clear_fifo(indio_dev);
return IRQ_HANDLED;
}
#endif
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;
}
#ifdef CONFIG_AMLOGIC_MODIFY
static int meson_sar_adc_sample_mode_set(struct iio_dev *indio_dev,
enum meson_sar_adc_sampling_mode mode)
{
struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
if (mode != SINGLE_MODE && mode != PERIOD_MODE)
return -EINVAL;
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
MESON_SAR_ADC_REG0_SAMPLING_STOP,
(mode == SINGLE_MODE) ?
MESON_SAR_ADC_REG0_SAMPLING_STOP : 0);
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
MESON_SAR_ADC_REG0_CONTINUOUS_EN,
(mode == PERIOD_MODE) ?
MESON_SAR_ADC_REG0_CONTINUOUS_EN : 0);
return 0;
}
static void meson_sar_adc_chan_spec_update(struct iio_dev *indio_dev)
{
struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
struct iio_chan_spec *chan;
int i;
for (i = 0; i < indio_dev->num_channels; i++) {
chan = (struct iio_chan_spec *)indio_dev->channels + i;
if (chan->channel < 0)
continue;
chan->scan_type.realbits = priv->param->resolution;
}
}
static int meson_sar_adc_update_scan_mode(struct iio_dev *indio_dev,
const unsigned long *scan_mask)
{
struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
kfree(priv->datum_buf);
priv->datum_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
if (!priv->datum_buf)
return -ENOMEM;
return 0;
}
static int
meson_sar_adc_iio_buffer_setup(struct iio_dev *indio_dev,
irqreturn_t (*pollfunc_bh)(int irq, void *p),
irqreturn_t (*pollfunc_th)(int irq, void *p),
int irq, unsigned long flags,
const struct iio_buffer_setup_ops *setup_ops)
{
struct iio_buffer *buffer;
int ret;
buffer = iio_kfifo_allocate();
if (!buffer)
return -ENOMEM;
iio_device_attach_buffer(indio_dev, buffer);
ret = devm_request_threaded_irq(indio_dev->dev.parent, irq,
pollfunc_th,
pollfunc_bh,
flags,
indio_dev->name,
indio_dev);
if (ret)
goto error_kfifo_free;
indio_dev->setup_ops = setup_ops;
indio_dev->modes |= INDIO_BUFFER_SOFTWARE;
return 0;
error_kfifo_free:
iio_kfifo_free(indio_dev->buffer);
return ret;
}
static int meson_sar_adc_iio_buffer_cleanup(struct iio_dev *indio_dev)
{
iio_kfifo_free(indio_dev->buffer);
return 0;
}
static int meson_sar_adc_buffer_postenable(struct iio_dev *indio_dev)
{
struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
const struct iio_chan_spec *chan;
unsigned char idx = 0;
unsigned char bit;
if (meson_sar_adc_pm_runtime_supported(indio_dev)) {
pm_runtime_dont_use_autosuspend(indio_dev->dev.parent);
if (pm_runtime_get_sync(indio_dev->dev.parent) < 0)
return -EINVAL;
}
meson_sar_adc_sample_mode_set(indio_dev, PERIOD_MODE);
/* set sampling period time */
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3,
MESON_SAR_ADC_DELAY_SAMPLE_DLY_SEL_MASK,
FIELD_PREP(MESON_SAR_ADC_DELAY_SAMPLE_DLY_SEL_MASK,
priv->delay_per_tick));
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3,
MESON_SAR_ADC_REG3_BLOCK_DLY_MASK,
FIELD_PREP(MESON_SAR_ADC_REG3_BLOCK_DLY_MASK,
priv->ticks_per_period));
meson_sar_adc_clear_fifo(indio_dev);
for_each_set_bit(bit, indio_dev->active_scan_mask,
indio_dev->num_channels) {
chan = indio_dev->channels + bit;
if (chan->channel < 0)
continue;
meson_sar_adc_enable_channel(indio_dev, chan, idx);
idx++;
}
if (!idx)
return -EINVAL;
priv->active_channel_cnt = idx;
/*
* generate interrupt when fifo contains N samples, and the N
* is required to align base on the number of active scan channel
*/
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
MESON_SAR_ADC_REG0_FIFO_CNT_IRQ_MASK,
FIELD_PREP(MESON_SAR_ADC_REG0_FIFO_CNT_IRQ_MASK,
16 - (16 % idx)));
/* enable irq */
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
MESON_SAR_ADC_REG0_FIFO_IRQ_EN,
MESON_SAR_ADC_REG0_FIFO_IRQ_EN);
/*
* enable chnl regs which save the sampling value for
* individual channel
*/
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG11,
MESON_SAR_ADC_REG11_CHNL_REGS_EN,
MESON_SAR_ADC_REG11_CHNL_REGS_EN);
meson_sar_adc_start_sample_engine(indio_dev);
return 0;
}
static int meson_sar_adc_buffer_predisable(struct iio_dev *indio_dev)
{
struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
meson_sar_adc_stop_sample_engine(indio_dev);
meson_sar_adc_sample_mode_set(indio_dev, SINGLE_MODE);
/* disable irq */
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
MESON_SAR_ADC_REG0_FIFO_IRQ_EN, 0);
/* disable chnl regs */
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG11,
MESON_SAR_ADC_REG11_CHNL_REGS_EN, 0);
if (meson_sar_adc_pm_runtime_supported(indio_dev)) {
pm_runtime_use_autosuspend(indio_dev->dev.parent);
pm_runtime_put_sync(indio_dev->dev.parent);
}
return 0;
}
static const struct iio_buffer_setup_ops meson_buffer_setup_ops = {
.postenable = meson_sar_adc_buffer_postenable,
.predisable = meson_sar_adc_buffer_predisable,
};
static ssize_t chan7_mux_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
int len = 0;
int i;
len = sprintf(buf, "current: [%d]%s\n\n",
priv->chan7_mux_sel, chan7_vol[priv->chan7_mux_sel]);
for (i = 0; i < ARRAY_SIZE(chan7_vol); i++)
len += sprintf(buf + len, "%d: %s\n", i, chan7_vol[i]);
return len;
}
static ssize_t chan7_mux_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
int val;
if (kstrtoint(buf, 0, &val) != 0)
return -EINVAL;
if (val >= ARRAY_SIZE(chan7_vol))
return -EINVAL;
if (meson_sar_adc_pm_runtime_supported(indio_dev)) {
if (pm_runtime_get_sync(indio_dev->dev.parent) < 0)
return -EINVAL;
}
meson_sar_adc_set_chan7_mux(indio_dev, val);
if (meson_sar_adc_pm_runtime_supported(indio_dev)) {
pm_runtime_mark_last_busy(indio_dev->dev.parent);
pm_runtime_put_autosuspend(indio_dev->dev.parent);
}
return count;
}
static IIO_DEVICE_ATTR(chan7_mux, 0644,
chan7_mux_show, chan7_mux_store, -1);
static struct attribute *meson_sar_adc_attrs[] = {
&iio_dev_attr_chan7_mux.dev_attr.attr,
NULL, /*need to terminate the list of attributes by NULL*/
};
static const struct attribute_group meson_sar_adc_attr_group = {
.attrs = meson_sar_adc_attrs,
};
#endif
static const struct iio_info meson_sar_adc_iio_info = {
.read_raw = meson_sar_adc_iio_info_read_raw,
#ifdef CONFIG_AMLOGIC_MODIFY
.update_scan_mode = meson_sar_adc_update_scan_mode,
.attrs = &meson_sar_adc_attr_group,
#endif
};
#ifndef CONFIG_AMLOGIC_REMOVE_OLD
#ifdef CONFIG_AMLOGIC_MODIFY
static
const struct meson_sar_adc_param meson_sar_adc_meson8_param __initconst = {
#else
static const struct meson_sar_adc_param meson_sar_adc_meson8_param = {
#endif
.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,
#ifdef CONFIG_AMLOGIC_MODIFY
.calib_enable = true,
#endif
};
#ifdef CONFIG_AMLOGIC_MODIFY
static
const struct meson_sar_adc_param meson_sar_adc_meson8b_param __initconst = {
#else
static const struct meson_sar_adc_param meson_sar_adc_meson8b_param = {
#endif
.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,
#ifdef CONFIG_AMLOGIC_MODIFY
.calib_enable = true,
#endif
};
#ifdef CONFIG_AMLOGIC_MODIFY
static const struct meson_sar_adc_param meson_sar_adc_gxbb_param __initconst = {
#else
static const struct meson_sar_adc_param meson_sar_adc_gxbb_param = {
#endif
.has_bl30_integration = true,
.clock_rate = 1200000,
.bandgap_reg = MESON_SAR_ADC_REG11,
.regmap_config = &meson_sar_adc_regmap_config_gxbb,
.resolution = 10,
#ifdef CONFIG_AMLOGIC_MODIFY
.vref_enable = 1,
.cmv_select = 1,
.calib_enable = true,
#endif
};
#ifdef CONFIG_AMLOGIC_MODIFY
static const struct meson_sar_adc_param meson_sar_adc_gxl_param __initconst = {
#else
static const struct meson_sar_adc_param meson_sar_adc_gxl_param = {
#endif
.has_bl30_integration = true,
.clock_rate = 1200000,
.bandgap_reg = MESON_SAR_ADC_REG11,
.regmap_config = &meson_sar_adc_regmap_config_gxbb,
.resolution = 12,
#ifdef CONFIG_AMLOGIC_MODIFY
.disable_ring_counter = 1,
.vref_enable = 1,
.cmv_select = 1,
.calib_enable = true,
#endif
};
#endif
#ifdef CONFIG_AMLOGIC_MODIFY
#ifndef CONFIG_AMLOGIC_REMOVE_OLD
static const struct meson_sar_adc_param meson_sar_adc_txlx_param __initconst = {
.has_bl30_integration = true,
.clock_rate = 1200000,
.bandgap_reg = MESON_SAR_ADC_REG11,
.regmap_config = &meson_sar_adc_regmap_config_gxbb,
.resolution = 12,
.vref_is_optional = true,
.disable_ring_counter = 1,
.vref_enable = 1,
.cmv_select = 1,
};
#endif
static const struct meson_sar_adc_param meson_sar_adc_g12a_param __initconst = {
.has_bl30_integration = false,
.clock_rate = 1200000,
.bandgap_reg = MESON_SAR_ADC_REG11,
.regmap_config = &meson_sar_adc_regmap_config_g12a,
.resolution = 12,
.vref_is_optional = true,
.disable_ring_counter = 1,
.has_chnl_regs = true,
.vref_enable = 0,
.cmv_select = 0,
.adc_eoc = 1,
};
#endif
#ifndef CONFIG_AMLOGIC_REMOVE_OLD
#ifdef CONFIG_AMLOGIC_MODIFY
static const struct meson_sar_adc_data meson_sar_adc_meson8_data __initconst = {
#else
static const struct meson_sar_adc_data meson_sar_adc_meson8_data = {
#endif
.param = &meson_sar_adc_meson8_param,
.name = "meson-meson8-saradc",
};
#ifdef CONFIG_AMLOGIC_MODIFY
static
const struct meson_sar_adc_data meson_sar_adc_meson8b_data __initconst = {
#else
static const struct meson_sar_adc_data meson_sar_adc_meson8b_data = {
#endif
.param = &meson_sar_adc_meson8b_param,
.name = "meson-meson8b-saradc",
};
#ifdef CONFIG_AMLOGIC_MODIFY
static
const struct meson_sar_adc_data meson_sar_adc_meson8m2_data __initconst = {
#else
static const struct meson_sar_adc_data meson_sar_adc_meson8m2_data = {
#endif
.param = &meson_sar_adc_meson8b_param,
.name = "meson-meson8m2-saradc",
};
#ifdef CONFIG_AMLOGIC_MODIFY
static const struct meson_sar_adc_data meson_sar_adc_gxbb_data __initconst = {
#else
static const struct meson_sar_adc_data meson_sar_adc_gxbb_data = {
#endif
.param = &meson_sar_adc_gxbb_param,
.name = "meson-gxbb-saradc",
};
#ifdef CONFIG_AMLOGIC_MODIFY
static const struct meson_sar_adc_data meson_sar_adc_gxl_data __initconst = {
#else
static const struct meson_sar_adc_data meson_sar_adc_gxl_data = {
#endif
.param = &meson_sar_adc_gxl_param,
.name = "meson-gxl-saradc",
};
#ifdef CONFIG_AMLOGIC_MODIFY
static const struct meson_sar_adc_data meson_sar_adc_gxm_data __initconst = {
#else
static const struct meson_sar_adc_data meson_sar_adc_gxm_data = {
#endif
.param = &meson_sar_adc_gxl_param,
.name = "meson-gxm-saradc",
};
#ifdef CONFIG_AMLOGIC_MODIFY
static const struct meson_sar_adc_data meson_sar_adc_axg_data __initconst = {
.param = &meson_sar_adc_txlx_param,
#else
static const struct meson_sar_adc_data meson_sar_adc_axg_data = {
.param = &meson_sar_adc_gxl_param,
#endif
.name = "meson-axg-saradc",
};
#endif
#ifdef CONFIG_AMLOGIC_MODIFY
static const struct meson_sar_adc_data meson_sar_adc_g12a_data __initconst = {
.param = &meson_sar_adc_g12a_param,
#else
static const struct meson_sar_adc_data meson_sar_adc_g12a_data = {
.param = &meson_sar_adc_gxl_param,
#endif
.name = "meson-g12a-saradc",
};
#ifdef CONFIG_AMLOGIC_MODIFY
#ifndef CONFIG_AMLOGIC_REMOVE_OLD
static const struct meson_sar_adc_data meson_sar_adc_txlx_data __initconst = {
.param = &meson_sar_adc_txlx_param,
.name = "meson-txlx-saradc",
};
#endif
#endif
static const struct of_device_id meson_sar_adc_of_match[] = {
#ifndef CONFIG_AMLOGIC_REMOVE_OLD
{
.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,
},
#endif
{
.compatible = "amlogic,meson-g12a-saradc",
.data = &meson_sar_adc_g12a_data,
},
#ifdef CONFIG_AMLOGIC_MODIFY
#ifndef CONFIG_AMLOGIC_REMOVE_OLD
{
.compatible = "amlogic,meson-txlx-saradc",
.data = &meson_sar_adc_txlx_data,
},
#endif
#endif
{},
};
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;
struct resource *res;
void __iomem *base;
int irq, ret;
#ifdef CONFIG_AMLOGIC_MODIFY
struct meson_sar_adc_param *match_param;
struct iio_chan_spec *chan;
int i;
#endif
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);
#ifndef CONFIG_AMLOGIC_MODIFY
init_completion(&priv->done);
#endif
match_data = of_device_get_match_data(&pdev->dev);
if (!match_data) {
dev_err(&pdev->dev, "failed to get match data\n");
return -ENODEV;
}
#ifdef CONFIG_AMLOGIC_MODIFY
match_param = devm_kzalloc(&pdev->dev, sizeof(*match_param),
GFP_KERNEL);
if (!match_param)
return -ENOMEM;
memcpy(match_param, match_data->param, sizeof(*match_param));
priv->param = match_param;
#else
priv->param = match_data->param;
#endif
indio_dev->name = match_data->name;
indio_dev->dev.parent = &pdev->dev;
indio_dev->dev.of_node = pdev->dev.of_node;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &meson_sar_adc_iio_info;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
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;
#ifndef CONFIG_AMLOGIC_MODIFY
ret = devm_request_irq(&pdev->dev, irq, meson_sar_adc_irq, IRQF_SHARED,
dev_name(&pdev->dev), indio_dev);
if (ret)
return ret;
#endif
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);
}
#ifdef CONFIG_AMLOGIC_MODIFY
ret = of_property_read_bool(pdev->dev.of_node,
"amlogic,enable-continuous-sampling");
if (priv->param->has_chnl_regs && ret) {
meson_sar_adc_chan_spec_update(indio_dev);
ret = of_property_read_u32(pdev->dev.of_node,
"amlogic,delay-per-tick",
&priv->delay_per_tick);
if (ret) {
dev_info(&pdev->dev,
"set delay per tick to <1ms> by default.");
/* 1ms per tick */
priv->delay_per_tick = 3;
}
ret = of_property_read_u32(pdev->dev.of_node,
"amlogic,ticks-per-period",
&priv->ticks_per_period);
if (ret) {
dev_info(&pdev->dev,
"set ticks per period to <1> by default.");
/* 1 ticks per sampling period */
priv->ticks_per_period = 1;
}
ret = meson_sar_adc_iio_buffer_setup(indio_dev,
&meson_sar_adc_worker,
&meson_sar_adc_irq,
irq,
IRQF_SHARED | IRQF_ONESHOT,
&meson_buffer_setup_ops);
if (ret)
return ret;
}
#endif
#ifdef CONFIG_AMLOGIC_MODIFY
platform_set_drvdata(pdev, indio_dev);
if (meson_sar_adc_pm_runtime_supported(indio_dev)) {
pm_runtime_enable(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev,
MESON_SAR_ADC_PM_TIMEOUT);
pm_runtime_use_autosuspend(&pdev->dev);
ret = pm_runtime_get_sync(&pdev->dev);
if (ret < 0)
goto err;
} else {
ret = meson_sar_adc_init(indio_dev);
if (ret)
goto err;
ret = meson_sar_adc_hw_enable(indio_dev);
if (ret)
goto err;
}
#else
ret = meson_sar_adc_init(indio_dev);
if (ret)
goto err;
ret = meson_sar_adc_hw_enable(indio_dev);
if (ret)
goto err;
#endif
#ifdef CONFIG_AMLOGIC_MODIFY
if (priv->param->calib_enable) {
for (i = 0; i < indio_dev->num_channels; i++) {
chan = (struct iio_chan_spec *)indio_dev->channels + i;
if (chan->channel < 0)
continue;
chan->info_mask_shared_by_all =
BIT(IIO_CHAN_INFO_CALIBBIAS) |
BIT(IIO_CHAN_INFO_CALIBSCALE);
}
ret = meson_sar_adc_calib(indio_dev);
if (ret)
dev_warn(&pdev->dev, "calibration failed\n");
}
#else
ret = meson_sar_adc_calib(indio_dev);
if (ret)
dev_warn(&pdev->dev, "calibration failed\n");
platform_set_drvdata(pdev, indio_dev);
#endif
ret = iio_device_register(indio_dev);
if (ret)
goto err_hw;
#ifdef CONFIG_AMLOGIC_MODIFY
if (meson_sar_adc_pm_runtime_supported(indio_dev)) {
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_put_autosuspend(&pdev->dev);
}
#endif
return 0;
err_hw:
meson_sar_adc_hw_disable(indio_dev);
err:
#ifdef CONFIG_AMLOGIC_MODIFY
if (iio_buffer_enabled(indio_dev))
meson_sar_adc_iio_buffer_cleanup(indio_dev);
pm_runtime_put_noidle(&pdev->dev);
pm_runtime_disable(&pdev->dev);
#endif
return ret;
}
static int meson_sar_adc_remove(struct platform_device *pdev)
{
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
#ifdef CONFIG_AMLOGIC_MODIFY
struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
if (meson_sar_adc_pm_runtime_supported(indio_dev)) {
pm_runtime_dont_use_autosuspend(&pdev->dev);
pm_runtime_disable(&pdev->dev);
}
#endif
iio_device_unregister(indio_dev);
#ifdef CONFIG_AMLOGIC_MODIFY
if (iio_buffer_enabled(indio_dev)) {
meson_sar_adc_iio_buffer_cleanup(indio_dev);
kfree(priv->datum_buf);
}
meson_sar_adc_hw_disable(indio_dev);
return meson_sar_adc_uninit(indio_dev);
#else
return meson_sar_adc_hw_disable(indio_dev);
#endif
}
static int __maybe_unused meson_sar_adc_suspend(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
#ifdef CONFIG_AMLOGIC_MODIFY
struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
if (iio_buffer_enabled(indio_dev))
meson_sar_adc_buffer_predisable(indio_dev);
if (meson_sar_adc_pm_runtime_supported(indio_dev)) {
pm_runtime_force_suspend(indio_dev->dev.parent);
clk_prepare_enable(priv->core_clk);
return 0;
} else {
return meson_sar_adc_hw_disable(indio_dev);
}
#else
return meson_sar_adc_hw_disable(indio_dev);
#endif
}
static int __maybe_unused meson_sar_adc_resume(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
#ifdef CONFIG_AMLOGIC_MODIFY
struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
int ret;
if (meson_sar_adc_pm_runtime_supported(indio_dev)) {
clk_disable_unprepare(priv->core_clk);
pm_runtime_force_resume(indio_dev->dev.parent);
} else {
ret = meson_sar_adc_hw_enable(indio_dev);
if (ret)
return ret;
}
if (iio_buffer_enabled(indio_dev))
return meson_sar_adc_buffer_postenable(indio_dev);
return 0;
#else
return meson_sar_adc_hw_enable(indio_dev);
#endif
}
#ifndef CONFIG_AMLOGIC_MODIFY
static SIMPLE_DEV_PM_OPS(meson_sar_adc_pm_ops,
meson_sar_adc_suspend, meson_sar_adc_resume);
#else
static int __maybe_unused meson_sar_adc_runtime_suspend(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
meson_sar_adc_hw_disable_unlock(indio_dev);
return meson_sar_adc_uninit(indio_dev);
}
static int __maybe_unused meson_sar_adc_runtime_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 = meson_sar_adc_init(indio_dev);
if (ret)
return ret;
ret = meson_sar_adc_hw_enable_unlock(indio_dev);
if (ret)
return ret;
meson_sar_adc_set_chan7_mux(indio_dev, priv->chan7_mux_sel);
return 0;
}
static const struct dev_pm_ops meson_sar_adc_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(meson_sar_adc_suspend, meson_sar_adc_resume)
SET_RUNTIME_PM_OPS(meson_sar_adc_runtime_suspend,
meson_sar_adc_runtime_resume, NULL)
};
#endif
#ifdef CONFIG_AMLOGIC_MODIFY
static void meson_sar_adc_shutdown(struct platform_device *pdev)
{
meson_sar_adc_suspend(&pdev->dev);
}
#endif
static struct platform_driver meson_sar_adc_driver = {
.probe = meson_sar_adc_probe,
.remove = meson_sar_adc_remove,
#ifdef CONFIG_AMLOGIC_MODIFY
.shutdown = meson_sar_adc_shutdown,
#endif
.driver = {
.name = "meson-saradc",
.of_match_table = meson_sar_adc_of_match,
.pm = &meson_sar_adc_pm_ops,
},
};
/*
* Because the kernel supports device link feature, it will cause
* the consumer driver(saradc) probe to be deferred if the supplier
* driver(regulator) is not ready. In general, module_platform_driver_probe
* is used to non-hotplug driver, it causes the drv->probe will be set to NULL,
* even the driver is unregistered.
*
* If the saradc driver is registered before the regulator driver,
* although the deferred mechanism will find the saradc driver again after
* regulator driver is registered at late_initcall stage, the saradc's
* drv->probe is NULL, nothing will be called for saradc driver. So the saradc
* driver registration failed.
*/
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");