diff options
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/iio/adc/aspeed_adc.c | 99 |
1 files changed, 12 insertions, 87 deletions
diff --git a/drivers/iio/adc/aspeed_adc.c b/drivers/iio/adc/aspeed_adc.c index c2d5f899430d..19efaa41bc34 100644 --- a/drivers/iio/adc/aspeed_adc.c +++ b/drivers/iio/adc/aspeed_adc.c @@ -1,12 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0-only /* - * Aspeed AST2400/2500/2600 ADC + * Aspeed AST2400/2500 ADC * * Copyright (C) 2017 Google, Inc. - * Copyright (C) ASPEED Technology Inc. - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, - * version 2, as published by the Free Software Foundation. - * */ #include <linux/clk.h> @@ -34,14 +30,6 @@ #define ASPEED_REG_CLOCK_CONTROL 0x0C #define ASPEED_REG_MAX 0xC0 -/* ast2600 */ -#define REF_VLOTAGE_2500mV 0 -#define REF_VLOTAGE_1200mV GENMASK(6, 6) -#define REF_VLOTAGE_1550mV GENMASK(7, 7) -#define REF_VLOTAGE_900mV GENMASK(7, 6) - -#define ASPEED_AUTOPENSATING BIT(5) - #define ASPEED_OPERATION_MODE_POWER_DOWN (0x0 << 1) #define ASPEED_OPERATION_MODE_STANDBY (0x1 << 1) #define ASPEED_OPERATION_MODE_NORMAL (0x7 << 1) @@ -57,10 +45,8 @@ struct aspeed_adc_model_data { const char *model_name; unsigned int min_sampling_rate; // Hz unsigned int max_sampling_rate; // Hz - u32 vref_voltage; // mV + unsigned int vref_voltage; // mV bool wait_init_sequence; - struct iio_chan_spec const *channels; - int num_channels; }; struct aspeed_adc_data { @@ -70,7 +56,6 @@ struct aspeed_adc_data { struct clk_hw *clk_prescaler; struct clk_hw *clk_scaler; struct reset_control *rst; - int cv; }; #define ASPEED_CHAN(_idx, _data_reg_addr) { \ @@ -102,17 +87,6 @@ static const struct iio_chan_spec aspeed_adc_iio_channels[] = { ASPEED_CHAN(15, 0x2E), }; -static const struct iio_chan_spec ast2600_adc_iio_channels[] = { - ASPEED_CHAN(0, 0x10), - ASPEED_CHAN(1, 0x12), - ASPEED_CHAN(2, 0x14), - ASPEED_CHAN(3, 0x16), - ASPEED_CHAN(4, 0x18), - ASPEED_CHAN(5, 0x1A), - ASPEED_CHAN(6, 0x1C), - ASPEED_CHAN(7, 0x1E), -}; - static int aspeed_adc_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) @@ -200,10 +174,7 @@ static int aspeed_adc_probe(struct platform_device *pdev) struct aspeed_adc_data *data; const struct aspeed_adc_model_data *model_data; const char *clk_parent_name; - char prescaler_clk_name[32]; - char scaler_clk_name[32]; int ret; - u32 eng_ctrl = 0; u32 adc_engine_control_reg_val; indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*data)); @@ -221,21 +192,19 @@ static int aspeed_adc_probe(struct platform_device *pdev) spin_lock_init(&data->clk_lock); clk_parent_name = of_clk_get_parent_name(pdev->dev.of_node, 0); - snprintf(prescaler_clk_name, sizeof(prescaler_clk_name), "prescaler-%s", pdev->name); data->clk_prescaler = clk_hw_register_divider( - &pdev->dev, prescaler_clk_name, clk_parent_name, 0, + &pdev->dev, "prescaler", clk_parent_name, 0, data->base + ASPEED_REG_CLOCK_CONTROL, 17, 15, 0, &data->clk_lock); if (IS_ERR(data->clk_prescaler)) return PTR_ERR(data->clk_prescaler); - snprintf(scaler_clk_name, sizeof(scaler_clk_name), "scaler-%s", pdev->name); /* * Register ADC clock scaler downstream from the prescaler. Allow rate * setting to adjust the prescaler as well. */ data->clk_scaler = clk_hw_register_divider( - &pdev->dev, scaler_clk_name, prescaler_clk_name, + &pdev->dev, "scaler", "prescaler", CLK_SET_RATE_PARENT, data->base + ASPEED_REG_CLOCK_CONTROL, 0, 10, 0, &data->clk_lock); @@ -244,7 +213,7 @@ static int aspeed_adc_probe(struct platform_device *pdev) goto scaler_error; } - data->rst = devm_reset_control_get_shared(&pdev->dev, NULL); + data->rst = devm_reset_control_get_exclusive(&pdev->dev, NULL); if (IS_ERR(data->rst)) { dev_err(&pdev->dev, "invalid or missing reset controller device tree entry"); @@ -254,26 +223,11 @@ static int aspeed_adc_probe(struct platform_device *pdev) reset_control_deassert(data->rst); model_data = of_device_get_match_data(&pdev->dev); - if (!of_property_read_u32(pdev->dev.of_node, "ref_voltage", (u32 *)&model_data->vref_voltage)) { - if (model_data->vref_voltage == 2500) - eng_ctrl = REF_VLOTAGE_2500mV; - else if (model_data->vref_voltage == 1200) - eng_ctrl = REF_VLOTAGE_1200mV; - else if ((model_data->vref_voltage >= 1550) && (model_data->vref_voltage <= 2700)) - eng_ctrl = REF_VLOTAGE_1550mV; - else if ((model_data->vref_voltage >= 900) && (model_data->vref_voltage <= 1650)) - eng_ctrl = REF_VLOTAGE_900mV; - else { - printk("error ref voltage %d \n", model_data->vref_voltage); - eng_ctrl = 0; - } - } else - eng_ctrl = 0; if (model_data->wait_init_sequence) { /* Enable engine in normal mode. */ - eng_ctrl |= ASPEED_OPERATION_MODE_NORMAL | ASPEED_ENGINE_ENABLE; - writel(eng_ctrl, data->base + ASPEED_REG_ENGINE_CONTROL); + writel(ASPEED_OPERATION_MODE_NORMAL | ASPEED_ENGINE_ENABLE, + data->base + ASPEED_REG_ENGINE_CONTROL); /* Wait for initial sequence complete. */ ret = readl_poll_timeout(data->base + ASPEED_REG_ENGINE_CONTROL, @@ -286,26 +240,12 @@ static int aspeed_adc_probe(struct platform_device *pdev) goto poll_timeout_error; } - /* do compensating calculation use ch 0 */ - writel(eng_ctrl | ASPEED_OPERATION_MODE_NORMAL | - ASPEED_ENGINE_ENABLE | ASPEED_AUTOPENSATING, data->base + ASPEED_REG_ENGINE_CONTROL); - - writel(eng_ctrl | ASPEED_OPERATION_MODE_NORMAL | BIT(16) | - ASPEED_ENGINE_ENABLE | ASPEED_AUTOPENSATING, data->base + ASPEED_REG_ENGINE_CONTROL); - mdelay(1); - - data->cv = 0x200 - (readl(data->base + 0x10) & GENMASK(9, 0)); - - writel(eng_ctrl | ASPEED_OPERATION_MODE_NORMAL | - ASPEED_ENGINE_ENABLE | ASPEED_AUTOPENSATING, data->base + ASPEED_REG_ENGINE_CONTROL); - printk(KERN_INFO "aspeed_adc: cv %d \n", data->cv); - /* Start all channels in normal mode. */ ret = clk_prepare_enable(data->clk_scaler->clk); if (ret) goto clk_enable_error; - adc_engine_control_reg_val = eng_ctrl | GENMASK(31, 16) | + adc_engine_control_reg_val = GENMASK(31, 16) | ASPEED_OPERATION_MODE_NORMAL | ASPEED_ENGINE_ENABLE; writel(adc_engine_control_reg_val, data->base + ASPEED_REG_ENGINE_CONTROL); @@ -314,8 +254,8 @@ static int aspeed_adc_probe(struct platform_device *pdev) indio_dev->name = model_data->model_name; indio_dev->info = &aspeed_adc_iio_info; indio_dev->modes = INDIO_DIRECT_MODE; - indio_dev->channels = model_data->channels; - indio_dev->num_channels = model_data->num_channels; + indio_dev->channels = aspeed_adc_iio_channels; + indio_dev->num_channels = ARRAY_SIZE(aspeed_adc_iio_channels); ret = iio_device_register(indio_dev); if (ret) @@ -358,8 +298,6 @@ static const struct aspeed_adc_model_data ast2400_model_data = { .vref_voltage = 2500, // mV .min_sampling_rate = 10000, .max_sampling_rate = 500000, - .channels = aspeed_adc_iio_channels, - .num_channels = 16, }; static const struct aspeed_adc_model_data ast2500_model_data = { @@ -368,24 +306,11 @@ static const struct aspeed_adc_model_data ast2500_model_data = { .min_sampling_rate = 1, .max_sampling_rate = 1000000, .wait_init_sequence = true, - .channels = aspeed_adc_iio_channels, - .num_channels = 16, -}; - -static const struct aspeed_adc_model_data ast2600_model_data = { - .model_name = "ast2500-adc", - .vref_voltage = 1800, /* mV --> can be 1.2v or 2.5 or ext 1.55~2.7v, 0.9v ~1.65v */ - .min_sampling_rate = 1, - .max_sampling_rate = 1000000, - .wait_init_sequence = true, - .channels = ast2600_adc_iio_channels, - .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-adc", .data = &ast2600_model_data }, {}, }; MODULE_DEVICE_TABLE(of, aspeed_adc_matches); @@ -402,5 +327,5 @@ static struct platform_driver aspeed_adc_driver = { module_platform_driver(aspeed_adc_driver); MODULE_AUTHOR("Rick Altherr <raltherr@google.com>"); -MODULE_DESCRIPTION("Aspeed AST2400/2500/2600 ADC Driver"); +MODULE_DESCRIPTION("Aspeed AST2400/2500 ADC Driver"); MODULE_LICENSE("GPL"); |