iio: adc: sc27xx: add support for PMIC sc2720 and sc2721
sc2720 and sc2721 is the product of sc27xx series. Co-developed-by: Yuming Zhu <yuming.zhu1@unisoc.com> Signed-off-by: Yuming Zhu <yuming.zhu1@unisoc.com> Signed-off-by: Cixi Geng <cixi.geng1@unisoc.com> Link: https://lore.kernel.org/r/20220419142458.884933-7-gengcixi@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Cixi Geng
Jonathan Cameron
parent
aac053d03e
commit
fff4a7a890
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@ -9,11 +9,13 @@
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/regulator/consumer.h>
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#include <linux/slab.h>
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/* PMIC global registers definition */
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#define SC2731_MODULE_EN 0xc08
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#define SC27XX_MODULE_ADC_EN BIT(5)
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#define SC2721_ARM_CLK_EN 0xc0c
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#define SC2731_ARM_CLK_EN 0xc10
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#define SC27XX_CLK_ADC_EN BIT(5)
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#define SC27XX_CLK_ADC_CLK_EN BIT(6)
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@ -37,7 +39,9 @@
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/* Bits and mask definition for SC27XX_ADC_CH_CFG register */
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#define SC27XX_ADC_CHN_ID_MASK GENMASK(4, 0)
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#define SC27XX_ADC_SCALE_MASK GENMASK(10, 9)
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#define SC2721_ADC_SCALE_MASK BIT(5)
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#define SC27XX_ADC_SCALE_SHIFT 9
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#define SC2721_ADC_SCALE_SHIFT 5
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/* Bits definitions for SC27XX_ADC_INT_EN registers */
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#define SC27XX_ADC_IRQ_EN BIT(0)
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@ -67,8 +71,15 @@
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#define SC27XX_RATIO_NUMERATOR_OFFSET 16
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#define SC27XX_RATIO_DENOMINATOR_MASK GENMASK(15, 0)
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/* ADC specific channel reference voltage 3.5V */
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#define SC27XX_ADC_REFVOL_VDD35 3500000
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/* ADC default channel reference voltage is 2.8V */
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#define SC27XX_ADC_REFVOL_VDD28 2800000
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struct sc27xx_adc_data {
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struct device *dev;
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struct regulator *volref;
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struct regmap *regmap;
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/*
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* One hardware spinlock to synchronize between the multiple
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@ -95,6 +106,7 @@ struct sc27xx_adc_variant_data {
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const struct sc27xx_adc_linear_graph *sscale_cal;
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void (*init_scale)(struct sc27xx_adc_data *data);
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int (*get_ratio)(int channel, int scale);
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bool set_volref;
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};
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struct sc27xx_adc_linear_graph {
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@ -130,6 +142,16 @@ static const struct sc27xx_adc_linear_graph sc2731_small_scale_graph_calib = {
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100, 84,
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};
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static const struct sc27xx_adc_linear_graph big_scale_graph_calib = {
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4200, 856,
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3600, 733,
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};
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static const struct sc27xx_adc_linear_graph small_scale_graph_calib = {
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1000, 833,
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100, 80,
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};
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static int sc27xx_adc_get_calib_data(u32 calib_data, int calib_adc)
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{
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return ((calib_data & 0xff) + calib_adc - 128) * 4;
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@ -191,6 +213,94 @@ static int sc27xx_adc_scale_calibration(struct sc27xx_adc_data *data,
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return 0;
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}
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static int sc2720_adc_get_ratio(int channel, int scale)
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{
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switch (channel) {
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case 14:
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switch (scale) {
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case 0:
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return SC27XX_VOLT_RATIO(68, 900);
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case 1:
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return SC27XX_VOLT_RATIO(68, 1760);
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case 2:
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return SC27XX_VOLT_RATIO(68, 2327);
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case 3:
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return SC27XX_VOLT_RATIO(68, 3654);
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default:
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return SC27XX_VOLT_RATIO(1, 1);
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}
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case 16:
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switch (scale) {
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case 0:
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return SC27XX_VOLT_RATIO(48, 100);
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case 1:
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return SC27XX_VOLT_RATIO(480, 1955);
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case 2:
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return SC27XX_VOLT_RATIO(480, 2586);
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case 3:
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return SC27XX_VOLT_RATIO(48, 406);
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default:
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return SC27XX_VOLT_RATIO(1, 1);
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}
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case 21:
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case 22:
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case 23:
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switch (scale) {
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case 0:
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return SC27XX_VOLT_RATIO(3, 8);
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case 1:
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return SC27XX_VOLT_RATIO(375, 1955);
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case 2:
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return SC27XX_VOLT_RATIO(375, 2586);
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case 3:
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return SC27XX_VOLT_RATIO(300, 3248);
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default:
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return SC27XX_VOLT_RATIO(1, 1);
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}
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default:
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switch (scale) {
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case 0:
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return SC27XX_VOLT_RATIO(1, 1);
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case 1:
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return SC27XX_VOLT_RATIO(1000, 1955);
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case 2:
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return SC27XX_VOLT_RATIO(1000, 2586);
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case 3:
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return SC27XX_VOLT_RATIO(100, 406);
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default:
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return SC27XX_VOLT_RATIO(1, 1);
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}
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}
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return SC27XX_VOLT_RATIO(1, 1);
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}
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static int sc2721_adc_get_ratio(int channel, int scale)
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{
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switch (channel) {
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case 1:
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case 2:
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case 3:
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case 4:
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return scale ? SC27XX_VOLT_RATIO(400, 1025) :
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SC27XX_VOLT_RATIO(1, 1);
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case 5:
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return SC27XX_VOLT_RATIO(7, 29);
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case 7:
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case 9:
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return scale ? SC27XX_VOLT_RATIO(100, 125) :
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SC27XX_VOLT_RATIO(1, 1);
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case 14:
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return SC27XX_VOLT_RATIO(68, 900);
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case 16:
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return SC27XX_VOLT_RATIO(48, 100);
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case 19:
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return SC27XX_VOLT_RATIO(1, 3);
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default:
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return SC27XX_VOLT_RATIO(1, 1);
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}
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return SC27XX_VOLT_RATIO(1, 1);
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}
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static int sc2731_adc_get_ratio(int channel, int scale)
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{
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switch (channel) {
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@ -219,6 +329,34 @@ static int sc2731_adc_get_ratio(int channel, int scale)
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/*
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* According to the datasheet set specific value on some channel.
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*/
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static void sc2720_adc_scale_init(struct sc27xx_adc_data *data)
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{
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int i;
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for (i = 0; i < SC27XX_ADC_CHANNEL_MAX; i++) {
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switch (i) {
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case 5:
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data->channel_scale[i] = 3;
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break;
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case 7:
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case 9:
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data->channel_scale[i] = 2;
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break;
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case 13:
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data->channel_scale[i] = 1;
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break;
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case 19:
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case 30:
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case 31:
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data->channel_scale[i] = 3;
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break;
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default:
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data->channel_scale[i] = 0;
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break;
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}
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}
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}
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static void sc2731_adc_scale_init(struct sc27xx_adc_data *data)
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{
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int i;
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@ -241,7 +379,7 @@ static void sc2731_adc_scale_init(struct sc27xx_adc_data *data)
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static int sc27xx_adc_read(struct sc27xx_adc_data *data, int channel,
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int scale, int *val)
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{
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int ret;
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int ret, ret_volref;
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u32 tmp, value, status;
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ret = hwspin_lock_timeout_raw(data->hwlock, SC27XX_ADC_HWLOCK_TIMEOUT);
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@ -250,10 +388,25 @@ static int sc27xx_adc_read(struct sc27xx_adc_data *data, int channel,
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return ret;
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}
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/*
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* According to the sc2721 chip data sheet, the reference voltage of
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* specific channel 30 and channel 31 in ADC module needs to be set from
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* the default 2.8v to 3.5v.
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*/
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if ((data->var_data->set_volref) && (channel == 30 || channel == 31)) {
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ret = regulator_set_voltage(data->volref,
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SC27XX_ADC_REFVOL_VDD35,
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SC27XX_ADC_REFVOL_VDD35);
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if (ret) {
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dev_err(data->dev, "failed to set the volref 3.5v\n");
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goto unlock_adc;
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}
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}
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ret = regmap_update_bits(data->regmap, data->base + SC27XX_ADC_CTL,
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SC27XX_ADC_EN, SC27XX_ADC_EN);
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if (ret)
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goto unlock_adc;
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goto regulator_restore;
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ret = regmap_update_bits(data->regmap, data->base + SC27XX_ADC_INT_CLR,
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SC27XX_ADC_IRQ_CLR, SC27XX_ADC_IRQ_CLR);
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@ -303,6 +456,17 @@ static int sc27xx_adc_read(struct sc27xx_adc_data *data, int channel,
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disable_adc:
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regmap_update_bits(data->regmap, data->base + SC27XX_ADC_CTL,
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SC27XX_ADC_EN, 0);
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regulator_restore:
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if ((data->var_data->set_volref) && (channel == 30 || channel == 31)) {
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ret_volref = regulator_set_voltage(data->volref,
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SC27XX_ADC_REFVOL_VDD28,
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SC27XX_ADC_REFVOL_VDD28);
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if (ret_volref) {
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dev_err(data->dev, "failed to set the volref 2.8v,ret_volref = 0x%x\n",
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ret_volref);
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ret = ret || ret_volref;
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}
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}
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unlock_adc:
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hwspin_unlock_raw(data->hwlock);
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@ -551,6 +715,31 @@ static const struct sc27xx_adc_variant_data sc2731_data = {
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.sscale_cal = &sc2731_small_scale_graph_calib,
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.init_scale = sc2731_adc_scale_init,
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.get_ratio = sc2731_adc_get_ratio,
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.set_volref = false,
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};
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static const struct sc27xx_adc_variant_data sc2721_data = {
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.module_en = SC2731_MODULE_EN,
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.clk_en = SC2721_ARM_CLK_EN,
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.scale_shift = SC2721_ADC_SCALE_SHIFT,
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.scale_mask = SC2721_ADC_SCALE_MASK,
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.bscale_cal = &sc2731_big_scale_graph_calib,
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.sscale_cal = &sc2731_small_scale_graph_calib,
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.init_scale = sc2731_adc_scale_init,
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.get_ratio = sc2721_adc_get_ratio,
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.set_volref = true,
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};
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static const struct sc27xx_adc_variant_data sc2720_data = {
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.module_en = SC2731_MODULE_EN,
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.clk_en = SC2721_ARM_CLK_EN,
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.scale_shift = SC27XX_ADC_SCALE_SHIFT,
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.scale_mask = SC27XX_ADC_SCALE_MASK,
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.bscale_cal = &big_scale_graph_calib,
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.sscale_cal = &small_scale_graph_calib,
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.init_scale = sc2720_adc_scale_init,
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.get_ratio = sc2720_adc_get_ratio,
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.set_volref = false,
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};
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static int sc27xx_adc_probe(struct platform_device *pdev)
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@ -603,6 +792,14 @@ static int sc27xx_adc_probe(struct platform_device *pdev)
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}
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sc27xx_data->dev = dev;
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if (pdata->set_volref) {
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sc27xx_data->volref = devm_regulator_get(dev, "vref");
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if (IS_ERR(sc27xx_data->volref)) {
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ret = PTR_ERR(sc27xx_data->volref);
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return dev_err_probe(dev, ret, "failed to get ADC volref\n");
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}
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}
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sc27xx_data->var_data = pdata;
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sc27xx_data->var_data->init_scale(sc27xx_data);
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@ -632,6 +829,8 @@ static int sc27xx_adc_probe(struct platform_device *pdev)
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static const struct of_device_id sc27xx_adc_of_match[] = {
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{ .compatible = "sprd,sc2731-adc", .data = &sc2731_data},
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{ .compatible = "sprd,sc2721-adc", .data = &sc2721_data},
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{ .compatible = "sprd,sc2720-adc", .data = &sc2720_data},
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{ }
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};
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MODULE_DEVICE_TABLE(of, sc27xx_adc_of_match);
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