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IIO: ADC: add stm32 DFSDM core support
Add driver for stm32 DFSDM pheripheral. Its converts a sigma delta stream in n bit samples through a low pass filter and an integrator. stm32-dfsdm-core driver is the core part supporting the filter instances dedicated to sigma-delta ADC or audio PDM microphone purpose. Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com> Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Arnaud Pouliquen
Mark Brown
parent
6c82f947fc
commit
bed73904e7
@ -668,6 +668,18 @@ config STM32_ADC
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This driver can also be built as a module. If so, the module
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will be called stm32-adc.
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config STM32_DFSDM_CORE
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tristate "STMicroelectronics STM32 DFSDM core"
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depends on (ARCH_STM32 && OF) || COMPILE_TEST
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select REGMAP
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select REGMAP_MMIO
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help
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Select this option to enable the driver for STMicroelectronics
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STM32 digital filter for sigma delta converter.
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This driver can also be built as a module. If so, the module
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will be called stm32-dfsdm-core.
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config STX104
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tristate "Apex Embedded Systems STX104 driver"
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depends on PC104 && X86 && ISA_BUS_API
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@ -64,6 +64,7 @@ obj-$(CONFIG_STX104) += stx104.o
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obj-$(CONFIG_SUN4I_GPADC) += sun4i-gpadc-iio.o
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obj-$(CONFIG_STM32_ADC_CORE) += stm32-adc-core.o
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obj-$(CONFIG_STM32_ADC) += stm32-adc.o
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obj-$(CONFIG_STM32_DFSDM_CORE) += stm32-dfsdm-core.o
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obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o
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obj-$(CONFIG_TI_ADC0832) += ti-adc0832.o
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obj-$(CONFIG_TI_ADC084S021) += ti-adc084s021.o
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309
drivers/iio/adc/stm32-dfsdm-core.c
Normal file
309
drivers/iio/adc/stm32-dfsdm-core.c
Normal file
@ -0,0 +1,309 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* This file is part the core part STM32 DFSDM driver
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*
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* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
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* Author(s): Arnaud Pouliquen <arnaud.pouliquen@st.com> for STMicroelectronics.
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*/
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#include <linux/clk.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include "stm32-dfsdm.h"
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struct stm32_dfsdm_dev_data {
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unsigned int num_filters;
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unsigned int num_channels;
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const struct regmap_config *regmap_cfg;
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};
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#define STM32H7_DFSDM_NUM_FILTERS 4
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#define STM32H7_DFSDM_NUM_CHANNELS 8
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static bool stm32_dfsdm_volatile_reg(struct device *dev, unsigned int reg)
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{
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if (reg < DFSDM_FILTER_BASE_ADR)
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return false;
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/*
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* Mask is done on register to avoid to list registers of all
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* filter instances.
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*/
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switch (reg & DFSDM_FILTER_REG_MASK) {
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case DFSDM_CR1(0) & DFSDM_FILTER_REG_MASK:
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case DFSDM_ISR(0) & DFSDM_FILTER_REG_MASK:
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case DFSDM_JDATAR(0) & DFSDM_FILTER_REG_MASK:
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case DFSDM_RDATAR(0) & DFSDM_FILTER_REG_MASK:
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return true;
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}
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return false;
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}
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static const struct regmap_config stm32h7_dfsdm_regmap_cfg = {
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.reg_bits = 32,
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.val_bits = 32,
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.reg_stride = sizeof(u32),
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.max_register = 0x2B8,
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.volatile_reg = stm32_dfsdm_volatile_reg,
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.fast_io = true,
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};
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static const struct stm32_dfsdm_dev_data stm32h7_dfsdm_data = {
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.num_filters = STM32H7_DFSDM_NUM_FILTERS,
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.num_channels = STM32H7_DFSDM_NUM_CHANNELS,
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.regmap_cfg = &stm32h7_dfsdm_regmap_cfg,
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};
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struct dfsdm_priv {
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struct platform_device *pdev; /* platform device */
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struct stm32_dfsdm dfsdm; /* common data exported for all instances */
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unsigned int spi_clk_out_div; /* SPI clkout divider value */
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atomic_t n_active_ch; /* number of current active channels */
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struct clk *clk; /* DFSDM clock */
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struct clk *aclk; /* audio clock */
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};
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/**
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* stm32_dfsdm_start_dfsdm - start global dfsdm interface.
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*
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* Enable interface if n_active_ch is not null.
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* @dfsdm: Handle used to retrieve dfsdm context.
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*/
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int stm32_dfsdm_start_dfsdm(struct stm32_dfsdm *dfsdm)
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{
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struct dfsdm_priv *priv = container_of(dfsdm, struct dfsdm_priv, dfsdm);
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struct device *dev = &priv->pdev->dev;
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unsigned int clk_div = priv->spi_clk_out_div;
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int ret;
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if (atomic_inc_return(&priv->n_active_ch) == 1) {
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ret = clk_prepare_enable(priv->clk);
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if (ret < 0) {
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dev_err(dev, "Failed to start clock\n");
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goto error_ret;
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}
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if (priv->aclk) {
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ret = clk_prepare_enable(priv->aclk);
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if (ret < 0) {
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dev_err(dev, "Failed to start audio clock\n");
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goto disable_clk;
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}
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}
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/* Output the SPI CLKOUT (if clk_div == 0 clock if OFF) */
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ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0),
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DFSDM_CHCFGR1_CKOUTDIV_MASK,
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DFSDM_CHCFGR1_CKOUTDIV(clk_div));
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if (ret < 0)
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goto disable_aclk;
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/* Global enable of DFSDM interface */
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ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0),
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DFSDM_CHCFGR1_DFSDMEN_MASK,
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DFSDM_CHCFGR1_DFSDMEN(1));
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if (ret < 0)
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goto disable_aclk;
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}
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dev_dbg(dev, "%s: n_active_ch %d\n", __func__,
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atomic_read(&priv->n_active_ch));
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return 0;
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disable_aclk:
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clk_disable_unprepare(priv->aclk);
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disable_clk:
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clk_disable_unprepare(priv->clk);
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error_ret:
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atomic_dec(&priv->n_active_ch);
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return ret;
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}
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EXPORT_SYMBOL_GPL(stm32_dfsdm_start_dfsdm);
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/**
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* stm32_dfsdm_stop_dfsdm - stop global DFSDM interface.
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*
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* Disable interface if n_active_ch is null
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* @dfsdm: Handle used to retrieve dfsdm context.
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*/
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int stm32_dfsdm_stop_dfsdm(struct stm32_dfsdm *dfsdm)
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{
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struct dfsdm_priv *priv = container_of(dfsdm, struct dfsdm_priv, dfsdm);
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int ret;
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if (atomic_dec_and_test(&priv->n_active_ch)) {
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/* Global disable of DFSDM interface */
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ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0),
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DFSDM_CHCFGR1_DFSDMEN_MASK,
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DFSDM_CHCFGR1_DFSDMEN(0));
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if (ret < 0)
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return ret;
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/* Stop SPI CLKOUT */
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ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0),
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DFSDM_CHCFGR1_CKOUTDIV_MASK,
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DFSDM_CHCFGR1_CKOUTDIV(0));
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if (ret < 0)
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return ret;
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clk_disable_unprepare(priv->clk);
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if (priv->aclk)
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clk_disable_unprepare(priv->aclk);
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}
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dev_dbg(&priv->pdev->dev, "%s: n_active_ch %d\n", __func__,
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atomic_read(&priv->n_active_ch));
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return 0;
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}
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EXPORT_SYMBOL_GPL(stm32_dfsdm_stop_dfsdm);
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static int stm32_dfsdm_parse_of(struct platform_device *pdev,
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struct dfsdm_priv *priv)
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{
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struct device_node *node = pdev->dev.of_node;
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struct resource *res;
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unsigned long clk_freq;
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unsigned int spi_freq, rem;
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int ret;
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if (!node)
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return -EINVAL;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev, "Failed to get memory resource\n");
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return -ENODEV;
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}
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priv->dfsdm.phys_base = res->start;
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priv->dfsdm.base = devm_ioremap_resource(&pdev->dev, res);
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/*
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* "dfsdm" clock is mandatory for DFSDM peripheral clocking.
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* "dfsdm" or "audio" clocks can be used as source clock for
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* the SPI clock out signal and internal processing, depending
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* on use case.
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*/
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priv->clk = devm_clk_get(&pdev->dev, "dfsdm");
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if (IS_ERR(priv->clk)) {
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dev_err(&pdev->dev, "No stm32_dfsdm_clk clock found\n");
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return -EINVAL;
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}
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priv->aclk = devm_clk_get(&pdev->dev, "audio");
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if (IS_ERR(priv->aclk))
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priv->aclk = NULL;
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if (priv->aclk)
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clk_freq = clk_get_rate(priv->aclk);
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else
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clk_freq = clk_get_rate(priv->clk);
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/* SPI clock out frequency */
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ret = of_property_read_u32(pdev->dev.of_node, "spi-max-frequency",
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&spi_freq);
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if (ret < 0) {
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/* No SPI master mode */
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return 0;
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}
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priv->spi_clk_out_div = div_u64_rem(clk_freq, spi_freq, &rem) - 1;
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priv->dfsdm.spi_master_freq = spi_freq;
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if (rem) {
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dev_warn(&pdev->dev, "SPI clock not accurate\n");
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dev_warn(&pdev->dev, "%ld = %d * %d + %d\n",
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clk_freq, spi_freq, priv->spi_clk_out_div + 1, rem);
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}
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return 0;
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};
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static const struct of_device_id stm32_dfsdm_of_match[] = {
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{
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.compatible = "st,stm32h7-dfsdm",
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.data = &stm32h7_dfsdm_data,
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},
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{}
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};
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MODULE_DEVICE_TABLE(of, stm32_dfsdm_of_match);
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static int stm32_dfsdm_probe(struct platform_device *pdev)
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{
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struct dfsdm_priv *priv;
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struct device_node *pnode = pdev->dev.of_node;
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const struct of_device_id *of_id;
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const struct stm32_dfsdm_dev_data *dev_data;
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struct stm32_dfsdm *dfsdm;
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int ret;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->pdev = pdev;
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of_id = of_match_node(stm32_dfsdm_of_match, pnode);
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if (!of_id->data) {
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dev_err(&pdev->dev, "Data associated to device is missing\n");
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return -EINVAL;
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}
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dev_data = (const struct stm32_dfsdm_dev_data *)of_id->data;
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dfsdm = &priv->dfsdm;
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dfsdm->fl_list = devm_kcalloc(&pdev->dev, dev_data->num_filters,
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sizeof(*dfsdm->fl_list), GFP_KERNEL);
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if (!dfsdm->fl_list)
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return -ENOMEM;
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dfsdm->num_fls = dev_data->num_filters;
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dfsdm->ch_list = devm_kcalloc(&pdev->dev, dev_data->num_channels,
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sizeof(*dfsdm->ch_list),
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GFP_KERNEL);
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if (!dfsdm->ch_list)
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return -ENOMEM;
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dfsdm->num_chs = dev_data->num_channels;
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ret = stm32_dfsdm_parse_of(pdev, priv);
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if (ret < 0)
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return ret;
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dfsdm->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "dfsdm",
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dfsdm->base,
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&stm32h7_dfsdm_regmap_cfg);
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if (IS_ERR(dfsdm->regmap)) {
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ret = PTR_ERR(dfsdm->regmap);
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dev_err(&pdev->dev, "%s: Failed to allocate regmap: %d\n",
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__func__, ret);
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return ret;
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}
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platform_set_drvdata(pdev, dfsdm);
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return devm_of_platform_populate(&pdev->dev);
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}
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static struct platform_driver stm32_dfsdm_driver = {
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.probe = stm32_dfsdm_probe,
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.driver = {
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.name = "stm32-dfsdm",
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.of_match_table = stm32_dfsdm_of_match,
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},
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};
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module_platform_driver(stm32_dfsdm_driver);
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MODULE_AUTHOR("Arnaud Pouliquen <arnaud.pouliquen@st.com>");
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MODULE_DESCRIPTION("STMicroelectronics STM32 dfsdm driver");
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MODULE_LICENSE("GPL v2");
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310
drivers/iio/adc/stm32-dfsdm.h
Normal file
310
drivers/iio/adc/stm32-dfsdm.h
Normal file
@ -0,0 +1,310 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* This file is part of STM32 DFSDM driver
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*
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* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
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* Author(s): Arnaud Pouliquen <arnaud.pouliquen@st.com>.
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*/
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#ifndef MDF_STM32_DFSDM__H
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#define MDF_STM32_DFSDM__H
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#include <linux/bitfield.h>
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/*
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* STM32 DFSDM - global register map
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* ________________________________________________________
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* | Offset | Registers block |
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* --------------------------------------------------------
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* | 0x000 | CHANNEL 0 + COMMON CHANNEL FIELDS |
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* --------------------------------------------------------
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* | 0x020 | CHANNEL 1 |
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* --------------------------------------------------------
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* | ... | ..... |
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* --------------------------------------------------------
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* | 0x0E0 | CHANNEL 7 |
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* --------------------------------------------------------
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* | 0x100 | FILTER 0 + COMMON FILTER FIELDs |
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* --------------------------------------------------------
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* | 0x200 | FILTER 1 |
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* --------------------------------------------------------
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* | 0x300 | FILTER 2 |
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* --------------------------------------------------------
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* | 0x400 | FILTER 3 |
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* --------------------------------------------------------
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*/
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/*
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* Channels register definitions
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*/
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#define DFSDM_CHCFGR1(y) ((y) * 0x20 + 0x00)
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#define DFSDM_CHCFGR2(y) ((y) * 0x20 + 0x04)
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#define DFSDM_AWSCDR(y) ((y) * 0x20 + 0x08)
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#define DFSDM_CHWDATR(y) ((y) * 0x20 + 0x0C)
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#define DFSDM_CHDATINR(y) ((y) * 0x20 + 0x10)
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/* CHCFGR1: Channel configuration register 1 */
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#define DFSDM_CHCFGR1_SITP_MASK GENMASK(1, 0)
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#define DFSDM_CHCFGR1_SITP(v) FIELD_PREP(DFSDM_CHCFGR1_SITP_MASK, v)
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#define DFSDM_CHCFGR1_SPICKSEL_MASK GENMASK(3, 2)
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#define DFSDM_CHCFGR1_SPICKSEL(v) FIELD_PREP(DFSDM_CHCFGR1_SPICKSEL_MASK, v)
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#define DFSDM_CHCFGR1_SCDEN_MASK BIT(5)
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#define DFSDM_CHCFGR1_SCDEN(v) FIELD_PREP(DFSDM_CHCFGR1_SCDEN_MASK, v)
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#define DFSDM_CHCFGR1_CKABEN_MASK BIT(6)
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#define DFSDM_CHCFGR1_CKABEN(v) FIELD_PREP(DFSDM_CHCFGR1_CKABEN_MASK, v)
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#define DFSDM_CHCFGR1_CHEN_MASK BIT(7)
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#define DFSDM_CHCFGR1_CHEN(v) FIELD_PREP(DFSDM_CHCFGR1_CHEN_MASK, v)
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#define DFSDM_CHCFGR1_CHINSEL_MASK BIT(8)
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#define DFSDM_CHCFGR1_CHINSEL(v) FIELD_PREP(DFSDM_CHCFGR1_CHINSEL_MASK, v)
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#define DFSDM_CHCFGR1_DATMPX_MASK GENMASK(13, 12)
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#define DFSDM_CHCFGR1_DATMPX(v) FIELD_PREP(DFSDM_CHCFGR1_DATMPX_MASK, v)
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#define DFSDM_CHCFGR1_DATPACK_MASK GENMASK(15, 14)
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#define DFSDM_CHCFGR1_DATPACK(v) FIELD_PREP(DFSDM_CHCFGR1_DATPACK_MASK, v)
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#define DFSDM_CHCFGR1_CKOUTDIV_MASK GENMASK(23, 16)
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#define DFSDM_CHCFGR1_CKOUTDIV(v) FIELD_PREP(DFSDM_CHCFGR1_CKOUTDIV_MASK, v)
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#define DFSDM_CHCFGR1_CKOUTSRC_MASK BIT(30)
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#define DFSDM_CHCFGR1_CKOUTSRC(v) FIELD_PREP(DFSDM_CHCFGR1_CKOUTSRC_MASK, v)
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#define DFSDM_CHCFGR1_DFSDMEN_MASK BIT(31)
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#define DFSDM_CHCFGR1_DFSDMEN(v) FIELD_PREP(DFSDM_CHCFGR1_DFSDMEN_MASK, v)
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||||
|
||||
/* CHCFGR2: Channel configuration register 2 */
|
||||
#define DFSDM_CHCFGR2_DTRBS_MASK GENMASK(7, 3)
|
||||
#define DFSDM_CHCFGR2_DTRBS(v) FIELD_PREP(DFSDM_CHCFGR2_DTRBS_MASK, v)
|
||||
#define DFSDM_CHCFGR2_OFFSET_MASK GENMASK(31, 8)
|
||||
#define DFSDM_CHCFGR2_OFFSET(v) FIELD_PREP(DFSDM_CHCFGR2_OFFSET_MASK, v)
|
||||
|
||||
/* AWSCDR: Channel analog watchdog and short circuit detector */
|
||||
#define DFSDM_AWSCDR_SCDT_MASK GENMASK(7, 0)
|
||||
#define DFSDM_AWSCDR_SCDT(v) FIELD_PREP(DFSDM_AWSCDR_SCDT_MASK, v)
|
||||
#define DFSDM_AWSCDR_BKSCD_MASK GENMASK(15, 12)
|
||||
#define DFSDM_AWSCDR_BKSCD(v) FIELD_PREP(DFSDM_AWSCDR_BKSCD_MASK, v)
|
||||
#define DFSDM_AWSCDR_AWFOSR_MASK GENMASK(20, 16)
|
||||
#define DFSDM_AWSCDR_AWFOSR(v) FIELD_PREP(DFSDM_AWSCDR_AWFOSR_MASK, v)
|
||||
#define DFSDM_AWSCDR_AWFORD_MASK GENMASK(23, 22)
|
||||
#define DFSDM_AWSCDR_AWFORD(v) FIELD_PREP(DFSDM_AWSCDR_AWFORD_MASK, v)
|
||||
|
||||
/*
|
||||
* Filters register definitions
|
||||
*/
|
||||
#define DFSDM_FILTER_BASE_ADR 0x100
|
||||
#define DFSDM_FILTER_REG_MASK 0x7F
|
||||
#define DFSDM_FILTER_X_BASE_ADR(x) ((x) * 0x80 + DFSDM_FILTER_BASE_ADR)
|
||||
|
||||
#define DFSDM_CR1(x) (DFSDM_FILTER_X_BASE_ADR(x) + 0x00)
|
||||
#define DFSDM_CR2(x) (DFSDM_FILTER_X_BASE_ADR(x) + 0x04)
|
||||
#define DFSDM_ISR(x) (DFSDM_FILTER_X_BASE_ADR(x) + 0x08)
|
||||
#define DFSDM_ICR(x) (DFSDM_FILTER_X_BASE_ADR(x) + 0x0C)
|
||||
#define DFSDM_JCHGR(x) (DFSDM_FILTER_X_BASE_ADR(x) + 0x10)
|
||||
#define DFSDM_FCR(x) (DFSDM_FILTER_X_BASE_ADR(x) + 0x14)
|
||||
#define DFSDM_JDATAR(x) (DFSDM_FILTER_X_BASE_ADR(x) + 0x18)
|
||||
#define DFSDM_RDATAR(x) (DFSDM_FILTER_X_BASE_ADR(x) + 0x1C)
|
||||
#define DFSDM_AWHTR(x) (DFSDM_FILTER_X_BASE_ADR(x) + 0x20)
|
||||
#define DFSDM_AWLTR(x) (DFSDM_FILTER_X_BASE_ADR(x) + 0x24)
|
||||
#define DFSDM_AWSR(x) (DFSDM_FILTER_X_BASE_ADR(x) + 0x28)
|
||||
#define DFSDM_AWCFR(x) (DFSDM_FILTER_X_BASE_ADR(x) + 0x2C)
|
||||
#define DFSDM_EXMAX(x) (DFSDM_FILTER_X_BASE_ADR(x) + 0x30)
|
||||
#define DFSDM_EXMIN(x) (DFSDM_FILTER_X_BASE_ADR(x) + 0x34)
|
||||
#define DFSDM_CNVTIMR(x) (DFSDM_FILTER_X_BASE_ADR(x) + 0x38)
|
||||
|
||||
/* CR1 Control register 1 */
|
||||
#define DFSDM_CR1_DFEN_MASK BIT(0)
|
||||
#define DFSDM_CR1_DFEN(v) FIELD_PREP(DFSDM_CR1_DFEN_MASK, v)
|
||||
#define DFSDM_CR1_JSWSTART_MASK BIT(1)
|
||||
#define DFSDM_CR1_JSWSTART(v) FIELD_PREP(DFSDM_CR1_JSWSTART_MASK, v)
|
||||
#define DFSDM_CR1_JSYNC_MASK BIT(3)
|
||||
#define DFSDM_CR1_JSYNC(v) FIELD_PREP(DFSDM_CR1_JSYNC_MASK, v)
|
||||
#define DFSDM_CR1_JSCAN_MASK BIT(4)
|
||||
#define DFSDM_CR1_JSCAN(v) FIELD_PREP(DFSDM_CR1_JSCAN_MASK, v)
|
||||
#define DFSDM_CR1_JDMAEN_MASK BIT(5)
|
||||
#define DFSDM_CR1_JDMAEN(v) FIELD_PREP(DFSDM_CR1_JDMAEN_MASK, v)
|
||||
#define DFSDM_CR1_JEXTSEL_MASK GENMASK(12, 8)
|
||||
#define DFSDM_CR1_JEXTSEL(v) FIELD_PREP(DFSDM_CR1_JEXTSEL_MASK, v)
|
||||
#define DFSDM_CR1_JEXTEN_MASK GENMASK(14, 13)
|
||||
#define DFSDM_CR1_JEXTEN(v) FIELD_PREP(DFSDM_CR1_JEXTEN_MASK, v)
|
||||
#define DFSDM_CR1_RSWSTART_MASK BIT(17)
|
||||
#define DFSDM_CR1_RSWSTART(v) FIELD_PREP(DFSDM_CR1_RSWSTART_MASK, v)
|
||||
#define DFSDM_CR1_RCONT_MASK BIT(18)
|
||||
#define DFSDM_CR1_RCONT(v) FIELD_PREP(DFSDM_CR1_RCONT_MASK, v)
|
||||
#define DFSDM_CR1_RSYNC_MASK BIT(19)
|
||||
#define DFSDM_CR1_RSYNC(v) FIELD_PREP(DFSDM_CR1_RSYNC_MASK, v)
|
||||
#define DFSDM_CR1_RDMAEN_MASK BIT(21)
|
||||
#define DFSDM_CR1_RDMAEN(v) FIELD_PREP(DFSDM_CR1_RDMAEN_MASK, v)
|
||||
#define DFSDM_CR1_RCH_MASK GENMASK(26, 24)
|
||||
#define DFSDM_CR1_RCH(v) FIELD_PREP(DFSDM_CR1_RCH_MASK, v)
|
||||
#define DFSDM_CR1_FAST_MASK BIT(29)
|
||||
#define DFSDM_CR1_FAST(v) FIELD_PREP(DFSDM_CR1_FAST_MASK, v)
|
||||
#define DFSDM_CR1_AWFSEL_MASK BIT(30)
|
||||
#define DFSDM_CR1_AWFSEL(v) FIELD_PREP(DFSDM_CR1_AWFSEL_MASK, v)
|
||||
|
||||
/* CR2: Control register 2 */
|
||||
#define DFSDM_CR2_IE_MASK GENMASK(6, 0)
|
||||
#define DFSDM_CR2_IE(v) FIELD_PREP(DFSDM_CR2_IE_MASK, v)
|
||||
#define DFSDM_CR2_JEOCIE_MASK BIT(0)
|
||||
#define DFSDM_CR2_JEOCIE(v) FIELD_PREP(DFSDM_CR2_JEOCIE_MASK, v)
|
||||
#define DFSDM_CR2_REOCIE_MASK BIT(1)
|
||||
#define DFSDM_CR2_REOCIE(v) FIELD_PREP(DFSDM_CR2_REOCIE_MASK, v)
|
||||
#define DFSDM_CR2_JOVRIE_MASK BIT(2)
|
||||
#define DFSDM_CR2_JOVRIE(v) FIELD_PREP(DFSDM_CR2_JOVRIE_MASK, v)
|
||||
#define DFSDM_CR2_ROVRIE_MASK BIT(3)
|
||||
#define DFSDM_CR2_ROVRIE(v) FIELD_PREP(DFSDM_CR2_ROVRIE_MASK, v)
|
||||
#define DFSDM_CR2_AWDIE_MASK BIT(4)
|
||||
#define DFSDM_CR2_AWDIE(v) FIELD_PREP(DFSDM_CR2_AWDIE_MASK, v)
|
||||
#define DFSDM_CR2_SCDIE_MASK BIT(5)
|
||||
#define DFSDM_CR2_SCDIE(v) FIELD_PREP(DFSDM_CR2_SCDIE_MASK, v)
|
||||
#define DFSDM_CR2_CKABIE_MASK BIT(6)
|
||||
#define DFSDM_CR2_CKABIE(v) FIELD_PREP(DFSDM_CR2_CKABIE_MASK, v)
|
||||
#define DFSDM_CR2_EXCH_MASK GENMASK(15, 8)
|
||||
#define DFSDM_CR2_EXCH(v) FIELD_PREP(DFSDM_CR2_EXCH_MASK, v)
|
||||
#define DFSDM_CR2_AWDCH_MASK GENMASK(23, 16)
|
||||
#define DFSDM_CR2_AWDCH(v) FIELD_PREP(DFSDM_CR2_AWDCH_MASK, v)
|
||||
|
||||
/* ISR: Interrupt status register */
|
||||
#define DFSDM_ISR_JEOCF_MASK BIT(0)
|
||||
#define DFSDM_ISR_JEOCF(v) FIELD_PREP(DFSDM_ISR_JEOCF_MASK, v)
|
||||
#define DFSDM_ISR_REOCF_MASK BIT(1)
|
||||
#define DFSDM_ISR_REOCF(v) FIELD_PREP(DFSDM_ISR_REOCF_MASK, v)
|
||||
#define DFSDM_ISR_JOVRF_MASK BIT(2)
|
||||
#define DFSDM_ISR_JOVRF(v) FIELD_PREP(DFSDM_ISR_JOVRF_MASK, v)
|
||||
#define DFSDM_ISR_ROVRF_MASK BIT(3)
|
||||
#define DFSDM_ISR_ROVRF(v) FIELD_PREP(DFSDM_ISR_ROVRF_MASK, v)
|
||||
#define DFSDM_ISR_AWDF_MASK BIT(4)
|
||||
#define DFSDM_ISR_AWDF(v) FIELD_PREP(DFSDM_ISR_AWDF_MASK, v)
|
||||
#define DFSDM_ISR_JCIP_MASK BIT(13)
|
||||
#define DFSDM_ISR_JCIP(v) FIELD_PREP(DFSDM_ISR_JCIP_MASK, v)
|
||||
#define DFSDM_ISR_RCIP_MASK BIT(14)
|
||||
#define DFSDM_ISR_RCIP(v) FIELD_PREP(DFSDM_ISR_RCIP, v)
|
||||
#define DFSDM_ISR_CKABF_MASK GENMASK(23, 16)
|
||||
#define DFSDM_ISR_CKABF(v) FIELD_PREP(DFSDM_ISR_CKABF_MASK, v)
|
||||
#define DFSDM_ISR_SCDF_MASK GENMASK(31, 24)
|
||||
#define DFSDM_ISR_SCDF(v) FIELD_PREP(DFSDM_ISR_SCDF_MASK, v)
|
||||
|
||||
/* ICR: Interrupt flag clear register */
|
||||
#define DFSDM_ICR_CLRJOVRF_MASK BIT(2)
|
||||
#define DFSDM_ICR_CLRJOVRF(v) FIELD_PREP(DFSDM_ICR_CLRJOVRF_MASK, v)
|
||||
#define DFSDM_ICR_CLRROVRF_MASK BIT(3)
|
||||
#define DFSDM_ICR_CLRROVRF(v) FIELD_PREP(DFSDM_ICR_CLRROVRF_MASK, v)
|
||||
#define DFSDM_ICR_CLRCKABF_MASK GENMASK(23, 16)
|
||||
#define DFSDM_ICR_CLRCKABF(v) FIELD_PREP(DFSDM_ICR_CLRCKABF_MASK, v)
|
||||
#define DFSDM_ICR_CLRCKABF_CH_MASK(y) BIT(16 + (y))
|
||||
#define DFSDM_ICR_CLRCKABF_CH(v, y) \
|
||||
(((v) << (16 + (y))) & DFSDM_ICR_CLRCKABF_CH_MASK(y))
|
||||
#define DFSDM_ICR_CLRSCDF_MASK GENMASK(31, 24)
|
||||
#define DFSDM_ICR_CLRSCDF(v) FIELD_PREP(DFSDM_ICR_CLRSCDF_MASK, v)
|
||||
#define DFSDM_ICR_CLRSCDF_CH_MASK(y) BIT(24 + (y))
|
||||
#define DFSDM_ICR_CLRSCDF_CH(v, y) \
|
||||
(((v) << (24 + (y))) & DFSDM_ICR_CLRSCDF_MASK(y))
|
||||
|
||||
/* FCR: Filter control register */
|
||||
#define DFSDM_FCR_IOSR_MASK GENMASK(7, 0)
|
||||
#define DFSDM_FCR_IOSR(v) FIELD_PREP(DFSDM_FCR_IOSR_MASK, v)
|
||||
#define DFSDM_FCR_FOSR_MASK GENMASK(25, 16)
|
||||
#define DFSDM_FCR_FOSR(v) FIELD_PREP(DFSDM_FCR_FOSR_MASK, v)
|
||||
#define DFSDM_FCR_FORD_MASK GENMASK(31, 29)
|
||||
#define DFSDM_FCR_FORD(v) FIELD_PREP(DFSDM_FCR_FORD_MASK, v)
|
||||
|
||||
/* RDATAR: Filter data register for regular channel */
|
||||
#define DFSDM_DATAR_CH_MASK GENMASK(2, 0)
|
||||
#define DFSDM_DATAR_DATA_OFFSET 8
|
||||
#define DFSDM_DATAR_DATA_MASK GENMASK(31, DFSDM_DATAR_DATA_OFFSET)
|
||||
|
||||
/* AWLTR: Filter analog watchdog low threshold register */
|
||||
#define DFSDM_AWLTR_BKAWL_MASK GENMASK(3, 0)
|
||||
#define DFSDM_AWLTR_BKAWL(v) FIELD_PREP(DFSDM_AWLTR_BKAWL_MASK, v)
|
||||
#define DFSDM_AWLTR_AWLT_MASK GENMASK(31, 8)
|
||||
#define DFSDM_AWLTR_AWLT(v) FIELD_PREP(DFSDM_AWLTR_AWLT_MASK, v)
|
||||
|
||||
/* AWHTR: Filter analog watchdog low threshold register */
|
||||
#define DFSDM_AWHTR_BKAWH_MASK GENMASK(3, 0)
|
||||
#define DFSDM_AWHTR_BKAWH(v) FIELD_PREP(DFSDM_AWHTR_BKAWH_MASK, v)
|
||||
#define DFSDM_AWHTR_AWHT_MASK GENMASK(31, 8)
|
||||
#define DFSDM_AWHTR_AWHT(v) FIELD_PREP(DFSDM_AWHTR_AWHT_MASK, v)
|
||||
|
||||
/* AWSR: Filter watchdog status register */
|
||||
#define DFSDM_AWSR_AWLTF_MASK GENMASK(7, 0)
|
||||
#define DFSDM_AWSR_AWLTF(v) FIELD_PREP(DFSDM_AWSR_AWLTF_MASK, v)
|
||||
#define DFSDM_AWSR_AWHTF_MASK GENMASK(15, 8)
|
||||
#define DFSDM_AWSR_AWHTF(v) FIELD_PREP(DFSDM_AWSR_AWHTF_MASK, v)
|
||||
|
||||
/* AWCFR: Filter watchdog status register */
|
||||
#define DFSDM_AWCFR_AWLTF_MASK GENMASK(7, 0)
|
||||
#define DFSDM_AWCFR_AWLTF(v) FIELD_PREP(DFSDM_AWCFR_AWLTF_MASK, v)
|
||||
#define DFSDM_AWCFR_AWHTF_MASK GENMASK(15, 8)
|
||||
#define DFSDM_AWCFR_AWHTF(v) FIELD_PREP(DFSDM_AWCFR_AWHTF_MASK, v)
|
||||
|
||||
/* DFSDM filter order */
|
||||
enum stm32_dfsdm_sinc_order {
|
||||
DFSDM_FASTSINC_ORDER, /* FastSinc filter type */
|
||||
DFSDM_SINC1_ORDER, /* Sinc 1 filter type */
|
||||
DFSDM_SINC2_ORDER, /* Sinc 2 filter type */
|
||||
DFSDM_SINC3_ORDER, /* Sinc 3 filter type */
|
||||
DFSDM_SINC4_ORDER, /* Sinc 4 filter type (N.A. for watchdog) */
|
||||
DFSDM_SINC5_ORDER, /* Sinc 5 filter type (N.A. for watchdog) */
|
||||
DFSDM_NB_SINC_ORDER,
|
||||
};
|
||||
|
||||
/**
|
||||
* struct stm32_dfsdm_filter - structure relative to stm32 FDSDM filter
|
||||
* @iosr: integrator oversampling
|
||||
* @fosr: filter oversampling
|
||||
* @ford: filter order
|
||||
* @res: output sample resolution
|
||||
* @sync_mode: filter synchronized with filter 0
|
||||
* @fast: filter fast mode
|
||||
*/
|
||||
struct stm32_dfsdm_filter {
|
||||
unsigned int iosr;
|
||||
unsigned int fosr;
|
||||
enum stm32_dfsdm_sinc_order ford;
|
||||
u64 res;
|
||||
unsigned int sync_mode;
|
||||
unsigned int fast;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct stm32_dfsdm_channel - structure relative to stm32 FDSDM channel
|
||||
* @id: id of the channel
|
||||
* @type: interface type linked to stm32_dfsdm_chan_type
|
||||
* @src: interface type linked to stm32_dfsdm_chan_src
|
||||
* @alt_si: alternative serial input interface
|
||||
*/
|
||||
struct stm32_dfsdm_channel {
|
||||
unsigned int id;
|
||||
unsigned int type;
|
||||
unsigned int src;
|
||||
unsigned int alt_si;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct stm32_dfsdm - stm32 FDSDM driver common data (for all instances)
|
||||
* @base: control registers base cpu addr
|
||||
* @phys_base: DFSDM IP register physical address
|
||||
* @regmap: regmap for register read/write
|
||||
* @fl_list: filter resources list
|
||||
* @num_fls: number of filter resources available
|
||||
* @ch_list: channel resources list
|
||||
* @num_chs: number of channel resources available
|
||||
* @spi_master_freq: SPI clock out frequency
|
||||
*/
|
||||
struct stm32_dfsdm {
|
||||
void __iomem *base;
|
||||
phys_addr_t phys_base;
|
||||
struct regmap *regmap;
|
||||
struct stm32_dfsdm_filter *fl_list;
|
||||
unsigned int num_fls;
|
||||
struct stm32_dfsdm_channel *ch_list;
|
||||
unsigned int num_chs;
|
||||
unsigned int spi_master_freq;
|
||||
};
|
||||
|
||||
/* DFSDM channel serial spi clock source */
|
||||
enum stm32_dfsdm_spi_clk_src {
|
||||
DFSDM_CHANNEL_SPI_CLOCK_EXTERNAL,
|
||||
DFSDM_CHANNEL_SPI_CLOCK_INTERNAL,
|
||||
DFSDM_CHANNEL_SPI_CLOCK_INTERNAL_DIV2_FALLING,
|
||||
DFSDM_CHANNEL_SPI_CLOCK_INTERNAL_DIV2_RISING
|
||||
};
|
||||
|
||||
int stm32_dfsdm_start_dfsdm(struct stm32_dfsdm *dfsdm);
|
||||
int stm32_dfsdm_stop_dfsdm(struct stm32_dfsdm *dfsdm);
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user