Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933850AbdCUUsv (ORCPT ); Tue, 21 Mar 2017 16:48:51 -0400 Received: from mail-pg0-f44.google.com ([74.125.83.44]:33587 "EHLO mail-pg0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932478AbdCUUsf (ORCPT ); Tue, 21 Mar 2017 16:48:35 -0400 From: Rick Altherr To: openbmc@lists.ozlabs.org, linux-kernel@vger.kernel.org Cc: Martin Blumenstingl , William Breathitt Gray , Andreas Klinger , Rob Herring , linux-iio@vger.kernel.org, Hartmut Knaack , Quentin Schulz , Geert Uytterhoeven , Marek Vasut , Matt Ranostay , Lars-Peter Clausen , Crestez Dan Leonard , Akinobu Mita , Fabrice Gasnier , Jonathan Cameron , Peter Meerwald-Stadler , Maxime Ripard , Jacopo Mondi Subject: [PATCH v2 2/2] iio: Aspeed AST2400/AST2500 ADC Date: Tue, 21 Mar 2017 13:48:28 -0700 Message-Id: <20170321204828.31303-2-raltherr@google.com> X-Mailer: git-send-email 2.12.1.500.gab5fba24ee-goog In-Reply-To: <20170321204828.31303-1-raltherr@google.com> References: <20170321204828.31303-1-raltherr@google.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9657 Lines: 331 Aspeed AST2400/AST2500 BMC SoCs include a 16 channel, 10-bit ADC. Low and high threshold interrupts are supported by the hardware but are not currently implemented. Signed-off-by: Rick Altherr --- Changes in v2: - Rewritten as an IIO device - Renamed register macros to describe the register's purpose - Replaced awkward reading of 16-bit data registers with readw() - Added Kconfig dependency on COMPILE_TEST drivers/iio/adc/Kconfig | 10 ++ drivers/iio/adc/Makefile | 1 + drivers/iio/adc/aspeed_adc.c | 271 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 282 insertions(+) create mode 100644 drivers/iio/adc/aspeed_adc.c diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 2268a6fb9865..9672d799a3fb 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -130,6 +130,16 @@ config AD799X To compile this driver as a module, choose M here: the module will be called ad799x. +config ASPEED_ADC + tristate "Aspeed AST2400/AST2500 ADC" + depends on ARCH_ASPEED || COMPILE_TEST + help + If you say yes here you get support for the Aspeed AST2400/AST2500 + ADC. + + To compile this driver as a module, choose M here: the module will be + called aspeed_adc. + config AT91_ADC tristate "Atmel AT91 ADC" depends on ARCH_AT91 diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index 73dbe399f894..306f10ffca74 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -14,6 +14,7 @@ obj-$(CONFIG_AD7791) += ad7791.o obj-$(CONFIG_AD7793) += ad7793.o obj-$(CONFIG_AD7887) += ad7887.o obj-$(CONFIG_AD799X) += ad799x.o +obj-$(CONFIG_ASPEED_ADC) += aspeed_adc.o obj-$(CONFIG_AT91_ADC) += at91_adc.o obj-$(CONFIG_AT91_SAMA5D2_ADC) += at91-sama5d2_adc.o obj-$(CONFIG_AXP288_ADC) += axp288_adc.o diff --git a/drivers/iio/adc/aspeed_adc.c b/drivers/iio/adc/aspeed_adc.c new file mode 100644 index 000000000000..9220909aefd4 --- /dev/null +++ b/drivers/iio/adc/aspeed_adc.c @@ -0,0 +1,271 @@ +/* + * Aspeed AST2400/2500 ADC + * + * Copyright (C) 2017 Google, 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#define ASPEED_ADC_NUM_CHANNELS 16 +#define ASPEED_ADC_REF_VOLTAGE 2500 /* millivolts */ +#define ASPEED_ADC_RESOLUTION_BITS 10 +#define ASPEED_ADC_MIN_SAMP_RATE 10000 +#define ASPEED_ADC_MAX_SAMP_RATE 500000 +#define ASPEED_ADC_CLOCKS_PER_SAMPLE 12 + +#define ASPEED_ADC_REG_ENGINE_CONTROL 0x00 +#define ASPEED_ADC_REG_INTERRUPT_CONTROL 0x04 +#define ASPEED_ADC_REG_VGA_DETECT_CONTROL 0x08 +#define ASPEED_ADC_REG_CLOCK_CONTROL 0x0C +#define ASPEED_ADC_REG_MAX 0xC0 + +#define ASPEED_ADC_OPERATION_MODE_POWER_DOWN (0x0 << 1) +#define ASPEED_ADC_OPERATION_MODE_STANDBY (0x1 << 1) +#define ASPEED_ADC_OPERATION_MODE_NORMAL (0x7 << 1) + +#define ASPEED_ADC_ENGINE_ENABLE BIT(0) + +struct aspeed_adc_data { + struct device *dev; + void __iomem *base; + + spinlock_t clk_lock; + struct clk_hw *clk_prescaler; + struct clk_hw *clk_scaler; +}; + +#define ASPEED_ADC_CHAN(_idx, _addr) { \ + .type = IIO_VOLTAGE, \ + .indexed = 1, \ + .channel = (_idx), \ + .address = (_addr), \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ +} + +static const struct iio_chan_spec aspeed_adc_iio_channels[] = { + ASPEED_ADC_CHAN(0, 0x10), + ASPEED_ADC_CHAN(1, 0x12), + ASPEED_ADC_CHAN(2, 0x14), + ASPEED_ADC_CHAN(3, 0x16), + ASPEED_ADC_CHAN(4, 0x18), + ASPEED_ADC_CHAN(5, 0x1A), + ASPEED_ADC_CHAN(6, 0x1C), + ASPEED_ADC_CHAN(7, 0x1E), + ASPEED_ADC_CHAN(8, 0x20), + ASPEED_ADC_CHAN(9, 0x22), + ASPEED_ADC_CHAN(10, 0x24), + ASPEED_ADC_CHAN(11, 0x26), + ASPEED_ADC_CHAN(12, 0x28), + ASPEED_ADC_CHAN(13, 0x2A), + ASPEED_ADC_CHAN(14, 0x2C), + ASPEED_ADC_CHAN(15, 0x2E), +}; + +static int aspeed_adc_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct aspeed_adc_data *data = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_RAW: + *val = readw(data->base + chan->address); + return IIO_VAL_INT; + + case IIO_CHAN_INFO_SCALE: + *val = 2500; // mV + *val2 = 10; + return IIO_VAL_FRACTIONAL_LOG2; + + case IIO_CHAN_INFO_SAMP_FREQ: + *val = clk_get_rate(data->clk_scaler->clk) / + ASPEED_ADC_CLOCKS_PER_SAMPLE; + return IIO_VAL_INT; + + default: + return -EINVAL; + } +} + +static int aspeed_adc_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct aspeed_adc_data *data = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_SAMP_FREQ: + if (val < ASPEED_ADC_MIN_SAMP_RATE || + val > ASPEED_ADC_MAX_SAMP_RATE) + return -EINVAL; + + clk_set_rate(data->clk_scaler->clk, + val * ASPEED_ADC_CLOCKS_PER_SAMPLE); + return 0; + + default: + return -EINVAL; + } +} + +static int aspeed_adc_reg_access(struct iio_dev *indio_dev, + unsigned int reg, unsigned int writeval, + unsigned int *readval) +{ + struct aspeed_adc_data *data = iio_priv(indio_dev); + + if (!readval || reg % 4 || reg > ASPEED_ADC_REG_MAX) + return -EINVAL; + + *readval = readl(data->base + reg); + return 0; +} + +static const struct iio_info aspeed_adc_iio_info = { + .driver_module = THIS_MODULE, + .read_raw = &aspeed_adc_read_raw, + .write_raw = &aspeed_adc_write_raw, + .debugfs_reg_access = &aspeed_adc_reg_access, +}; + +static int aspeed_adc_probe(struct platform_device *pdev) +{ + struct iio_dev *indio_dev; + struct aspeed_adc_data *data; + struct resource *res; + const char *clk_parent_name; + int ret; + u32 adc_engine_control_reg_val; + + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*data)); + if (!indio_dev) { + dev_err(&pdev->dev, "Failed allocating iio device\n"); + return -ENOMEM; + } + + data = iio_priv(indio_dev); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + data->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(data->base)) { + dev_err(&pdev->dev, "Failed allocating device resources\n"); + ret = PTR_ERR(data->base); + goto resource_error; + } + + /* Register ADC clock prescaler with source specified by device tree. */ + spin_lock_init(&data->clk_lock); + clk_parent_name = of_clk_get_parent_name(pdev->dev.of_node, 0); + + data->clk_prescaler = clk_hw_register_divider( + &pdev->dev, "prescaler", clk_parent_name, 0, + data->base + ASPEED_ADC_REG_CLOCK_CONTROL, + 17, 15, 0, &data->clk_lock); + if (IS_ERR(data->clk_prescaler)) { + dev_err(&pdev->dev, "Failed allocating prescaler clock\n"); + ret = PTR_ERR(data->clk_prescaler); + goto prescaler_error; + } + + /* + * 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", "prescaler", + CLK_SET_RATE_PARENT, + data->base + ASPEED_ADC_REG_CLOCK_CONTROL, + 0, 10, 0, &data->clk_lock); + if (IS_ERR(data->clk_scaler)) { + dev_err(&pdev->dev, "Failed allocating scaler clock\n"); + ret = PTR_ERR(data->clk_scaler); + goto scaler_error; + } + + /* Start all channels in normal mode. */ + clk_prepare_enable(data->clk_scaler->clk); + adc_engine_control_reg_val = GENMASK(31, 16) | + ASPEED_ADC_OPERATION_MODE_NORMAL | ASPEED_ADC_ENGINE_ENABLE; + writel(adc_engine_control_reg_val, + data->base + ASPEED_ADC_REG_ENGINE_CONTROL); + + indio_dev->name = dev_name(&pdev->dev); + indio_dev->dev.parent = &pdev->dev; + indio_dev->info = &aspeed_adc_iio_info; + indio_dev->modes = INDIO_DIRECT_MODE; + 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) { + dev_err(&pdev->dev, "Could't register the device.\n"); + goto iio_register_error; + } + + return 0; + +iio_register_error: + writel(0x0, data->base + ASPEED_ADC_REG_ENGINE_CONTROL); + clk_disable_unprepare(data->clk_scaler->clk); + clk_hw_unregister_divider(data->clk_scaler); + +scaler_error: + clk_hw_unregister_divider(data->clk_prescaler); + +prescaler_error: +resource_error: + return ret; +} + +static int aspeed_adc_remove(struct platform_device *pdev) +{ + struct iio_dev *indio_dev = platform_get_drvdata(pdev); + struct aspeed_adc_data *data = iio_priv(indio_dev); + + iio_device_unregister(indio_dev); + clk_disable_unprepare(data->clk_scaler->clk); + clk_hw_unregister_divider(data->clk_scaler); + clk_hw_unregister_divider(data->clk_prescaler); + + return 0; +} + +const struct of_device_id aspeed_adc_matches[] = { + { .compatible = "aspeed,ast2400-adc" }, + { .compatible = "aspeed,ast2500-adc" }, +}; +MODULE_DEVICE_TABLE(of, aspeed_adc_matches); + +static struct platform_driver aspeed_adc_driver = { + .probe = aspeed_adc_probe, + .remove = aspeed_adc_remove, + .driver = { + .name = KBUILD_MODNAME, + .of_match_table = aspeed_adc_matches, + } +}; + +module_platform_driver(aspeed_adc_driver); + +MODULE_AUTHOR("Rick Altherr "); +MODULE_DESCRIPTION("Aspeed AST2400/2500 ADC Driver"); +MODULE_LICENSE("GPL"); -- 2.12.1.500.gab5fba24ee-goog