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Commit fff4a7a8 authored by Cixi Geng's avatar Cixi Geng Committed by Jonathan Cameron
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iio: adc: sc27xx: add support for PMIC sc2720 and sc2721 

sc2720 and sc2721 is the product of sc27xx series.
Co-developed-by: default avatarYuming Zhu <yuming.zhu1@unisoc.com>
Signed-off-by: default avatarYuming Zhu <yuming.zhu1@unisoc.com>
Signed-off-by: default avatarCixi Geng <cixi.geng1@unisoc.com>
Link: https://lore.kernel.org/r/20220419142458.884933-7-gengcixi@gmail.comSigned-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent aac053d0
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Showing with 201 additions and 2 deletions
drivers/iio/adc/sc27xx_adc.c
View file @ fff4a7a8
......@@ -9,11 +9,13 @@
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
/* PMIC global registers definition */
#define SC2731_MODULE_EN 0xc08
#define SC27XX_MODULE_ADC_EN BIT(5)
#define SC2721_ARM_CLK_EN 0xc0c
#define SC2731_ARM_CLK_EN 0xc10
#define SC27XX_CLK_ADC_EN BIT(5)
#define SC27XX_CLK_ADC_CLK_EN BIT(6)
......@@ -37,7 +39,9 @@
/* Bits and mask definition for SC27XX_ADC_CH_CFG register */
#define SC27XX_ADC_CHN_ID_MASK GENMASK(4, 0)
#define SC27XX_ADC_SCALE_MASK GENMASK(10, 9)
#define SC2721_ADC_SCALE_MASK BIT(5)
#define SC27XX_ADC_SCALE_SHIFT 9
#define SC2721_ADC_SCALE_SHIFT 5
/* Bits definitions for SC27XX_ADC_INT_EN registers */
#define SC27XX_ADC_IRQ_EN BIT(0)
......@@ -67,8 +71,15 @@
#define SC27XX_RATIO_NUMERATOR_OFFSET 16
#define SC27XX_RATIO_DENOMINATOR_MASK GENMASK(15, 0)
/* ADC specific channel reference voltage 3.5V */
#define SC27XX_ADC_REFVOL_VDD35 3500000
/* ADC default channel reference voltage is 2.8V */
#define SC27XX_ADC_REFVOL_VDD28 2800000
struct sc27xx_adc_data {
struct device *dev;
struct regulator *volref;
struct regmap *regmap;
/*
* One hardware spinlock to synchronize between the multiple
......@@ -95,6 +106,7 @@ struct sc27xx_adc_variant_data {
const struct sc27xx_adc_linear_graph *sscale_cal;
void (*init_scale)(struct sc27xx_adc_data *data);
int (*get_ratio)(int channel, int scale);
bool set_volref;
};
struct sc27xx_adc_linear_graph {
......@@ -130,6 +142,16 @@ static const struct sc27xx_adc_linear_graph sc2731_small_scale_graph_calib = {
100, 84,
};
static const struct sc27xx_adc_linear_graph big_scale_graph_calib = {
4200, 856,
3600, 733,
};
static const struct sc27xx_adc_linear_graph small_scale_graph_calib = {
1000, 833,
100, 80,
};
static int sc27xx_adc_get_calib_data(u32 calib_data, int calib_adc)
{
return ((calib_data & 0xff) + calib_adc - 128) * 4;
......@@ -191,6 +213,94 @@ static int sc27xx_adc_scale_calibration(struct sc27xx_adc_data *data,
return 0;
}
static int sc2720_adc_get_ratio(int channel, int scale)
{
switch (channel) {
case 14:
switch (scale) {
case 0:
return SC27XX_VOLT_RATIO(68, 900);
case 1:
return SC27XX_VOLT_RATIO(68, 1760);
case 2:
return SC27XX_VOLT_RATIO(68, 2327);
case 3:
return SC27XX_VOLT_RATIO(68, 3654);
default:
return SC27XX_VOLT_RATIO(1, 1);
}
case 16:
switch (scale) {
case 0:
return SC27XX_VOLT_RATIO(48, 100);
case 1:
return SC27XX_VOLT_RATIO(480, 1955);
case 2:
return SC27XX_VOLT_RATIO(480, 2586);
case 3:
return SC27XX_VOLT_RATIO(48, 406);
default:
return SC27XX_VOLT_RATIO(1, 1);
}
case 21:
case 22:
case 23:
switch (scale) {
case 0:
return SC27XX_VOLT_RATIO(3, 8);
case 1:
return SC27XX_VOLT_RATIO(375, 1955);
case 2:
return SC27XX_VOLT_RATIO(375, 2586);
case 3:
return SC27XX_VOLT_RATIO(300, 3248);
default:
return SC27XX_VOLT_RATIO(1, 1);
}
default:
switch (scale) {
case 0:
return SC27XX_VOLT_RATIO(1, 1);
case 1:
return SC27XX_VOLT_RATIO(1000, 1955);
case 2:
return SC27XX_VOLT_RATIO(1000, 2586);
case 3:
return SC27XX_VOLT_RATIO(100, 406);
default:
return SC27XX_VOLT_RATIO(1, 1);
}
}
return SC27XX_VOLT_RATIO(1, 1);
}
static int sc2721_adc_get_ratio(int channel, int scale)
{
switch (channel) {
case 1:
case 2:
case 3:
case 4:
return scale ? SC27XX_VOLT_RATIO(400, 1025) :
SC27XX_VOLT_RATIO(1, 1);
case 5:
return SC27XX_VOLT_RATIO(7, 29);
case 7:
case 9:
return scale ? SC27XX_VOLT_RATIO(100, 125) :
SC27XX_VOLT_RATIO(1, 1);
case 14:
return SC27XX_VOLT_RATIO(68, 900);
case 16:
return SC27XX_VOLT_RATIO(48, 100);
case 19:
return SC27XX_VOLT_RATIO(1, 3);
default:
return SC27XX_VOLT_RATIO(1, 1);
}
return SC27XX_VOLT_RATIO(1, 1);
}
static int sc2731_adc_get_ratio(int channel, int scale)
{
switch (channel) {
......@@ -219,6 +329,34 @@ static int sc2731_adc_get_ratio(int channel, int scale)
/*
* According to the datasheet set specific value on some channel.
*/
static void sc2720_adc_scale_init(struct sc27xx_adc_data *data)
{
int i;
for (i = 0; i < SC27XX_ADC_CHANNEL_MAX; i++) {
switch (i) {
case 5:
data->channel_scale[i] = 3;
break;
case 7:
case 9:
data->channel_scale[i] = 2;
break;
case 13:
data->channel_scale[i] = 1;
break;
case 19:
case 30:
case 31:
data->channel_scale[i] = 3;
break;
default:
data->channel_scale[i] = 0;
break;
}
}
}
static void sc2731_adc_scale_init(struct sc27xx_adc_data *data)
{
int i;
......@@ -241,7 +379,7 @@ static void sc2731_adc_scale_init(struct sc27xx_adc_data *data)
static int sc27xx_adc_read(struct sc27xx_adc_data *data, int channel,
int scale, int *val)
{
int ret;
int ret, ret_volref;
u32 tmp, value, status;
ret = hwspin_lock_timeout_raw(data->hwlock, SC27XX_ADC_HWLOCK_TIMEOUT);
......@@ -250,10 +388,25 @@ static int sc27xx_adc_read(struct sc27xx_adc_data *data, int channel,
return ret;
}
/*
* According to the sc2721 chip data sheet, the reference voltage of
* specific channel 30 and channel 31 in ADC module needs to be set from
* the default 2.8v to 3.5v.
*/
if ((data->var_data->set_volref) && (channel == 30 || channel == 31)) {
ret = regulator_set_voltage(data->volref,
SC27XX_ADC_REFVOL_VDD35,
SC27XX_ADC_REFVOL_VDD35);
if (ret) {
dev_err(data->dev, "failed to set the volref 3.5v\n");
goto unlock_adc;
}
}
ret = regmap_update_bits(data->regmap, data->base + SC27XX_ADC_CTL,
SC27XX_ADC_EN, SC27XX_ADC_EN);
if (ret)
goto unlock_adc;
goto regulator_restore;
ret = regmap_update_bits(data->regmap, data->base + SC27XX_ADC_INT_CLR,
SC27XX_ADC_IRQ_CLR, SC27XX_ADC_IRQ_CLR);
......@@ -303,6 +456,17 @@ static int sc27xx_adc_read(struct sc27xx_adc_data *data, int channel,
disable_adc:
regmap_update_bits(data->regmap, data->base + SC27XX_ADC_CTL,
SC27XX_ADC_EN, 0);
regulator_restore:
if ((data->var_data->set_volref) && (channel == 30 || channel == 31)) {
ret_volref = regulator_set_voltage(data->volref,
SC27XX_ADC_REFVOL_VDD28,
SC27XX_ADC_REFVOL_VDD28);
if (ret_volref) {
dev_err(data->dev, "failed to set the volref 2.8v,ret_volref = 0x%x\n",
ret_volref);
ret = ret || ret_volref;
}
}
unlock_adc:
hwspin_unlock_raw(data->hwlock);
......@@ -551,6 +715,31 @@ static const struct sc27xx_adc_variant_data sc2731_data = {
.sscale_cal = &sc2731_small_scale_graph_calib,
.init_scale = sc2731_adc_scale_init,
.get_ratio = sc2731_adc_get_ratio,
.set_volref = false,
};
static const struct sc27xx_adc_variant_data sc2721_data = {
.module_en = SC2731_MODULE_EN,
.clk_en = SC2721_ARM_CLK_EN,
.scale_shift = SC2721_ADC_SCALE_SHIFT,
.scale_mask = SC2721_ADC_SCALE_MASK,
.bscale_cal = &sc2731_big_scale_graph_calib,
.sscale_cal = &sc2731_small_scale_graph_calib,
.init_scale = sc2731_adc_scale_init,
.get_ratio = sc2721_adc_get_ratio,
.set_volref = true,
};
static const struct sc27xx_adc_variant_data sc2720_data = {
.module_en = SC2731_MODULE_EN,
.clk_en = SC2721_ARM_CLK_EN,
.scale_shift = SC27XX_ADC_SCALE_SHIFT,
.scale_mask = SC27XX_ADC_SCALE_MASK,
.bscale_cal = &big_scale_graph_calib,
.sscale_cal = &small_scale_graph_calib,
.init_scale = sc2720_adc_scale_init,
.get_ratio = sc2720_adc_get_ratio,
.set_volref = false,
};
static int sc27xx_adc_probe(struct platform_device *pdev)
......@@ -603,6 +792,14 @@ static int sc27xx_adc_probe(struct platform_device *pdev)
}
sc27xx_data->dev = dev;
if (pdata->set_volref) {
sc27xx_data->volref = devm_regulator_get(dev, "vref");
if (IS_ERR(sc27xx_data->volref)) {
ret = PTR_ERR(sc27xx_data->volref);
return dev_err_probe(dev, ret, "failed to get ADC volref\n");
}
}
sc27xx_data->var_data = pdata;
sc27xx_data->var_data->init_scale(sc27xx_data);
......@@ -632,6 +829,8 @@ static int sc27xx_adc_probe(struct platform_device *pdev)
static const struct of_device_id sc27xx_adc_of_match[] = {
{ .compatible = "sprd,sc2731-adc", .data = &sc2731_data},
{ .compatible = "sprd,sc2721-adc", .data = &sc2721_data},
{ .compatible = "sprd,sc2720-adc", .data = &sc2720_data},
{ }
};
MODULE_DEVICE_TABLE(of, sc27xx_adc_of_match);
......
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