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iio: adc: aspeed: Support ast2600 adc.
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Make driver to support ast2600 adc device.
- Use shared reset controller
- Complete the vref configure function
- Add the model data for ast2600 adc

Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
Link: https://lore.kernel.org/r/20210922081520.30580-7-billy_tsai@aspeedtech.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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Billy Tsai authored and Jonathan Cameron committed Oct 19, 2021
1 parent 4c56572 commit 1b5ceb5
Showing 1 changed file with 96 additions and 5 deletions.
101 changes: 96 additions & 5 deletions drivers/iio/adc/aspeed_adc.c
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Aspeed AST2400/2500 ADC
* Aspeed AST2400/2500/2600 ADC
*
* Copyright (C) 2017 Google, Inc.
* Copyright (C) 2021 Aspeed Technology Inc.
Expand All @@ -14,6 +14,7 @@
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
#include <linux/spinlock.h>
#include <linux/types.h>
Expand Down Expand Up @@ -81,6 +82,7 @@ struct aspeed_adc_model_data {
struct aspeed_adc_data {
struct device *dev;
const struct aspeed_adc_model_data *model_data;
struct regulator *regulator;
void __iomem *base;
spinlock_t clk_lock;
struct clk_hw *clk_prescaler;
Expand Down Expand Up @@ -217,14 +219,79 @@ static void aspeed_adc_power_down(void *data)
priv_data->base + ASPEED_REG_ENGINE_CONTROL);
}

static void aspeed_adc_reg_disable(void *data)
{
struct regulator *reg = data;

regulator_disable(reg);
}

static int aspeed_adc_vref_config(struct iio_dev *indio_dev)
{
struct aspeed_adc_data *data = iio_priv(indio_dev);
int ret;
u32 adc_engine_control_reg_val;

if (data->model_data->vref_fixed_mv) {
data->vref_mv = data->model_data->vref_fixed_mv;
return 0;
}
adc_engine_control_reg_val =
readl(data->base + ASPEED_REG_ENGINE_CONTROL);
data->regulator = devm_regulator_get_optional(data->dev, "vref");
if (!IS_ERR(data->regulator)) {
ret = regulator_enable(data->regulator);
if (ret)
return ret;
ret = devm_add_action_or_reset(
data->dev, aspeed_adc_reg_disable, data->regulator);
if (ret)
return ret;
data->vref_mv = regulator_get_voltage(data->regulator);
/* Conversion from uV to mV */
data->vref_mv /= 1000;
if ((data->vref_mv >= 1550) && (data->vref_mv <= 2700))
writel(adc_engine_control_reg_val |
FIELD_PREP(
ASPEED_ADC_REF_VOLTAGE,
ASPEED_ADC_REF_VOLTAGE_EXT_HIGH),
data->base + ASPEED_REG_ENGINE_CONTROL);
else if ((data->vref_mv >= 900) && (data->vref_mv <= 1650))
writel(adc_engine_control_reg_val |
FIELD_PREP(
ASPEED_ADC_REF_VOLTAGE,
ASPEED_ADC_REF_VOLTAGE_EXT_LOW),
data->base + ASPEED_REG_ENGINE_CONTROL);
else {
dev_err(data->dev, "Regulator voltage %d not support",
data->vref_mv);
return -EOPNOTSUPP;
}
} else {
if (PTR_ERR(data->regulator) != -ENODEV)
return PTR_ERR(data->regulator);
data->vref_mv = 2500000;
of_property_read_u32(data->dev->of_node,
"aspeed,int-vref-microvolt",
&data->vref_mv);
/* Conversion from uV to mV */
data->vref_mv /= 1000;
if (data->vref_mv == 2500)
writel(adc_engine_control_reg_val |
FIELD_PREP(ASPEED_ADC_REF_VOLTAGE,
ASPEED_ADC_REF_VOLTAGE_2500mV),
data->base + ASPEED_REG_ENGINE_CONTROL);
else if (data->vref_mv == 1200)
writel(adc_engine_control_reg_val |
FIELD_PREP(ASPEED_ADC_REF_VOLTAGE,
ASPEED_ADC_REF_VOLTAGE_1200mV),
data->base + ASPEED_REG_ENGINE_CONTROL);
else {
dev_err(data->dev, "Voltage %d not support", data->vref_mv);
return -EOPNOTSUPP;
}
}

return 0;
}

Expand Down Expand Up @@ -280,7 +347,7 @@ static int aspeed_adc_probe(struct platform_device *pdev)
if (IS_ERR(data->clk_scaler))
return PTR_ERR(data->clk_scaler);

data->rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);
data->rst = devm_reset_control_get_shared(&pdev->dev, NULL);
if (IS_ERR(data->rst)) {
dev_err(&pdev->dev,
"invalid or missing reset controller device tree entry");
Expand All @@ -297,9 +364,13 @@ static int aspeed_adc_probe(struct platform_device *pdev)
if (ret)
return ret;

adc_engine_control_reg_val =
readl(data->base + ASPEED_REG_ENGINE_CONTROL);
adc_engine_control_reg_val |=
FIELD_PREP(ASPEED_ADC_OP_MODE, ASPEED_ADC_OP_MODE_NORMAL) |
ASPEED_ADC_ENGINE_ENABLE;
/* Enable engine in normal mode. */
writel(FIELD_PREP(ASPEED_ADC_OP_MODE, ASPEED_ADC_OP_MODE_NORMAL) |
ASPEED_ADC_ENGINE_ENABLE,
writel(adc_engine_control_reg_val,
data->base + ASPEED_REG_ENGINE_CONTROL);

ret = devm_add_action_or_reset(data->dev, aspeed_adc_power_down,
Expand Down Expand Up @@ -367,9 +438,29 @@ static const struct aspeed_adc_model_data ast2500_model_data = {
.num_channels = 16,
};

static const struct aspeed_adc_model_data ast2600_adc0_model_data = {
.model_name = "ast2600-adc0",
.min_sampling_rate = 10000,
.max_sampling_rate = 500000,
.wait_init_sequence = true,
.scaler_bit_width = 16,
.num_channels = 8,
};

static const struct aspeed_adc_model_data ast2600_adc1_model_data = {
.model_name = "ast2600-adc1",
.min_sampling_rate = 10000,
.max_sampling_rate = 500000,
.wait_init_sequence = true,
.scaler_bit_width = 16,
.num_channels = 8,
};

static const struct of_device_id aspeed_adc_matches[] = {
{ .compatible = "aspeed,ast2400-adc", .data = &ast2400_model_data },
{ .compatible = "aspeed,ast2500-adc", .data = &ast2500_model_data },
{ .compatible = "aspeed,ast2600-adc0", .data = &ast2600_adc0_model_data },
{ .compatible = "aspeed,ast2600-adc1", .data = &ast2600_adc1_model_data },
{},
};
MODULE_DEVICE_TABLE(of, aspeed_adc_matches);
Expand All @@ -385,5 +476,5 @@ static struct platform_driver aspeed_adc_driver = {
module_platform_driver(aspeed_adc_driver);

MODULE_AUTHOR("Rick Altherr <raltherr@google.com>");
MODULE_DESCRIPTION("Aspeed AST2400/2500 ADC Driver");
MODULE_DESCRIPTION("Aspeed AST2400/2500/2600 ADC Driver");
MODULE_LICENSE("GPL");

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