![Fabrice Gasnier](/assets/img/avatar_default.png)
stm32 adc supports several resolution. Add 'assigned-resolution-bits' dt optional property to set it. Default to maximum resolution in case it isn't set. Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
1152 lines
29 KiB
C
1152 lines
29 KiB
C
/*
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* This file is part of STM32 ADC driver
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*
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* Copyright (C) 2016, STMicroelectronics - All Rights Reserved
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* Author: Fabrice Gasnier <fabrice.gasnier@st.com>.
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*
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* License type: GPLv2
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/dma-mapping.h>
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#include <linux/dmaengine.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/timer/stm32-timer-trigger.h>
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#include <linux/iio/trigger.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include "stm32-adc-core.h"
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/* STM32F4 - Registers for each ADC instance */
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#define STM32F4_ADC_SR 0x00
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#define STM32F4_ADC_CR1 0x04
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#define STM32F4_ADC_CR2 0x08
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#define STM32F4_ADC_SMPR1 0x0C
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#define STM32F4_ADC_SMPR2 0x10
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#define STM32F4_ADC_HTR 0x24
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#define STM32F4_ADC_LTR 0x28
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#define STM32F4_ADC_SQR1 0x2C
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#define STM32F4_ADC_SQR2 0x30
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#define STM32F4_ADC_SQR3 0x34
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#define STM32F4_ADC_JSQR 0x38
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#define STM32F4_ADC_JDR1 0x3C
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#define STM32F4_ADC_JDR2 0x40
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#define STM32F4_ADC_JDR3 0x44
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#define STM32F4_ADC_JDR4 0x48
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#define STM32F4_ADC_DR 0x4C
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/* STM32F4_ADC_SR - bit fields */
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#define STM32F4_STRT BIT(4)
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#define STM32F4_EOC BIT(1)
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/* STM32F4_ADC_CR1 - bit fields */
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#define STM32F4_RES_SHIFT 24
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#define STM32F4_RES_MASK GENMASK(25, 24)
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#define STM32F4_SCAN BIT(8)
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#define STM32F4_EOCIE BIT(5)
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/* STM32F4_ADC_CR2 - bit fields */
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#define STM32F4_SWSTART BIT(30)
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#define STM32F4_EXTEN_SHIFT 28
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#define STM32F4_EXTEN_MASK GENMASK(29, 28)
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#define STM32F4_EXTSEL_SHIFT 24
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#define STM32F4_EXTSEL_MASK GENMASK(27, 24)
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#define STM32F4_EOCS BIT(10)
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#define STM32F4_DDS BIT(9)
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#define STM32F4_DMA BIT(8)
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#define STM32F4_ADON BIT(0)
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#define STM32_ADC_MAX_SQ 16 /* SQ1..SQ16 */
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#define STM32_ADC_TIMEOUT_US 100000
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#define STM32_ADC_TIMEOUT (msecs_to_jiffies(STM32_ADC_TIMEOUT_US / 1000))
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#define STM32_DMA_BUFFER_SIZE PAGE_SIZE
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/* External trigger enable */
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enum stm32_adc_exten {
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STM32_EXTEN_SWTRIG,
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STM32_EXTEN_HWTRIG_RISING_EDGE,
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STM32_EXTEN_HWTRIG_FALLING_EDGE,
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STM32_EXTEN_HWTRIG_BOTH_EDGES,
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};
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/* extsel - trigger mux selection value */
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enum stm32_adc_extsel {
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STM32_EXT0,
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STM32_EXT1,
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STM32_EXT2,
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STM32_EXT3,
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STM32_EXT4,
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STM32_EXT5,
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STM32_EXT6,
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STM32_EXT7,
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STM32_EXT8,
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STM32_EXT9,
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STM32_EXT10,
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STM32_EXT11,
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STM32_EXT12,
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STM32_EXT13,
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STM32_EXT14,
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STM32_EXT15,
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};
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/**
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* struct stm32_adc_trig_info - ADC trigger info
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* @name: name of the trigger, corresponding to its source
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* @extsel: trigger selection
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*/
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struct stm32_adc_trig_info {
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const char *name;
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enum stm32_adc_extsel extsel;
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};
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/**
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* stm32_adc_regs - stm32 ADC misc registers & bitfield desc
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* @reg: register offset
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* @mask: bitfield mask
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* @shift: left shift
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*/
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struct stm32_adc_regs {
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int reg;
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int mask;
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int shift;
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};
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/**
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* struct stm32_adc - private data of each ADC IIO instance
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* @common: reference to ADC block common data
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* @offset: ADC instance register offset in ADC block
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* @completion: end of single conversion completion
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* @buffer: data buffer
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* @clk: clock for this adc instance
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* @irq: interrupt for this adc instance
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* @lock: spinlock
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* @bufi: data buffer index
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* @num_conv: expected number of scan conversions
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* @res: data resolution (e.g. RES bitfield value)
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* @trigger_polarity: external trigger polarity (e.g. exten)
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* @dma_chan: dma channel
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* @rx_buf: dma rx buffer cpu address
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* @rx_dma_buf: dma rx buffer bus address
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* @rx_buf_sz: dma rx buffer size
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*/
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struct stm32_adc {
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struct stm32_adc_common *common;
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u32 offset;
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struct completion completion;
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u16 buffer[STM32_ADC_MAX_SQ];
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struct clk *clk;
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int irq;
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spinlock_t lock; /* interrupt lock */
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unsigned int bufi;
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unsigned int num_conv;
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u32 res;
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u32 trigger_polarity;
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struct dma_chan *dma_chan;
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u8 *rx_buf;
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dma_addr_t rx_dma_buf;
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unsigned int rx_buf_sz;
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};
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/**
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* struct stm32_adc_chan_spec - specification of stm32 adc channel
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* @type: IIO channel type
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* @channel: channel number (single ended)
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* @name: channel name (single ended)
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*/
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struct stm32_adc_chan_spec {
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enum iio_chan_type type;
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int channel;
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const char *name;
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};
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/* Input definitions common for all STM32F4 instances */
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static const struct stm32_adc_chan_spec stm32f4_adc123_channels[] = {
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{ IIO_VOLTAGE, 0, "in0" },
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{ IIO_VOLTAGE, 1, "in1" },
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{ IIO_VOLTAGE, 2, "in2" },
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{ IIO_VOLTAGE, 3, "in3" },
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{ IIO_VOLTAGE, 4, "in4" },
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{ IIO_VOLTAGE, 5, "in5" },
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{ IIO_VOLTAGE, 6, "in6" },
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{ IIO_VOLTAGE, 7, "in7" },
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{ IIO_VOLTAGE, 8, "in8" },
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{ IIO_VOLTAGE, 9, "in9" },
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{ IIO_VOLTAGE, 10, "in10" },
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{ IIO_VOLTAGE, 11, "in11" },
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{ IIO_VOLTAGE, 12, "in12" },
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{ IIO_VOLTAGE, 13, "in13" },
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{ IIO_VOLTAGE, 14, "in14" },
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{ IIO_VOLTAGE, 15, "in15" },
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};
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static const unsigned int stm32f4_adc_resolutions[] = {
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/* sorted values so the index matches RES[1:0] in STM32F4_ADC_CR1 */
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12, 10, 8, 6,
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};
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/**
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* stm32f4_sq - describe regular sequence registers
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* - L: sequence len (register & bit field)
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* - SQ1..SQ16: sequence entries (register & bit field)
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*/
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static const struct stm32_adc_regs stm32f4_sq[STM32_ADC_MAX_SQ + 1] = {
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/* L: len bit field description to be kept as first element */
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{ STM32F4_ADC_SQR1, GENMASK(23, 20), 20 },
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/* SQ1..SQ16 registers & bit fields (reg, mask, shift) */
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{ STM32F4_ADC_SQR3, GENMASK(4, 0), 0 },
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{ STM32F4_ADC_SQR3, GENMASK(9, 5), 5 },
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{ STM32F4_ADC_SQR3, GENMASK(14, 10), 10 },
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{ STM32F4_ADC_SQR3, GENMASK(19, 15), 15 },
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{ STM32F4_ADC_SQR3, GENMASK(24, 20), 20 },
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{ STM32F4_ADC_SQR3, GENMASK(29, 25), 25 },
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{ STM32F4_ADC_SQR2, GENMASK(4, 0), 0 },
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{ STM32F4_ADC_SQR2, GENMASK(9, 5), 5 },
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{ STM32F4_ADC_SQR2, GENMASK(14, 10), 10 },
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{ STM32F4_ADC_SQR2, GENMASK(19, 15), 15 },
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{ STM32F4_ADC_SQR2, GENMASK(24, 20), 20 },
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{ STM32F4_ADC_SQR2, GENMASK(29, 25), 25 },
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{ STM32F4_ADC_SQR1, GENMASK(4, 0), 0 },
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{ STM32F4_ADC_SQR1, GENMASK(9, 5), 5 },
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{ STM32F4_ADC_SQR1, GENMASK(14, 10), 10 },
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{ STM32F4_ADC_SQR1, GENMASK(19, 15), 15 },
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};
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/* STM32F4 external trigger sources for all instances */
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static struct stm32_adc_trig_info stm32f4_adc_trigs[] = {
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{ TIM1_CH1, STM32_EXT0 },
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{ TIM1_CH2, STM32_EXT1 },
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{ TIM1_CH3, STM32_EXT2 },
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{ TIM2_CH2, STM32_EXT3 },
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{ TIM2_CH3, STM32_EXT4 },
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{ TIM2_CH4, STM32_EXT5 },
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{ TIM2_TRGO, STM32_EXT6 },
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{ TIM3_CH1, STM32_EXT7 },
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{ TIM3_TRGO, STM32_EXT8 },
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{ TIM4_CH4, STM32_EXT9 },
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{ TIM5_CH1, STM32_EXT10 },
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{ TIM5_CH2, STM32_EXT11 },
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{ TIM5_CH3, STM32_EXT12 },
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{ TIM8_CH1, STM32_EXT13 },
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{ TIM8_TRGO, STM32_EXT14 },
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{}, /* sentinel */
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};
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/**
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* STM32 ADC registers access routines
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* @adc: stm32 adc instance
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* @reg: reg offset in adc instance
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*
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* Note: All instances share same base, with 0x0, 0x100 or 0x200 offset resp.
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* for adc1, adc2 and adc3.
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*/
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static u32 stm32_adc_readl(struct stm32_adc *adc, u32 reg)
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{
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return readl_relaxed(adc->common->base + adc->offset + reg);
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}
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static u16 stm32_adc_readw(struct stm32_adc *adc, u32 reg)
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{
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return readw_relaxed(adc->common->base + adc->offset + reg);
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}
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static void stm32_adc_writel(struct stm32_adc *adc, u32 reg, u32 val)
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{
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writel_relaxed(val, adc->common->base + adc->offset + reg);
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}
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static void stm32_adc_set_bits(struct stm32_adc *adc, u32 reg, u32 bits)
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{
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unsigned long flags;
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spin_lock_irqsave(&adc->lock, flags);
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stm32_adc_writel(adc, reg, stm32_adc_readl(adc, reg) | bits);
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spin_unlock_irqrestore(&adc->lock, flags);
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}
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static void stm32_adc_clr_bits(struct stm32_adc *adc, u32 reg, u32 bits)
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{
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unsigned long flags;
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spin_lock_irqsave(&adc->lock, flags);
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stm32_adc_writel(adc, reg, stm32_adc_readl(adc, reg) & ~bits);
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spin_unlock_irqrestore(&adc->lock, flags);
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}
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/**
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* stm32_adc_conv_irq_enable() - Enable end of conversion interrupt
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* @adc: stm32 adc instance
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*/
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static void stm32_adc_conv_irq_enable(struct stm32_adc *adc)
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{
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stm32_adc_set_bits(adc, STM32F4_ADC_CR1, STM32F4_EOCIE);
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};
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/**
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* stm32_adc_conv_irq_disable() - Disable end of conversion interrupt
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* @adc: stm32 adc instance
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*/
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static void stm32_adc_conv_irq_disable(struct stm32_adc *adc)
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{
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stm32_adc_clr_bits(adc, STM32F4_ADC_CR1, STM32F4_EOCIE);
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}
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static void stm32_adc_set_res(struct stm32_adc *adc)
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{
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u32 val = stm32_adc_readl(adc, STM32F4_ADC_CR1);
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val = (val & ~STM32F4_RES_MASK) | (adc->res << STM32F4_RES_SHIFT);
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stm32_adc_writel(adc, STM32F4_ADC_CR1, val);
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}
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/**
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* stm32_adc_start_conv() - Start conversions for regular channels.
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* @adc: stm32 adc instance
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* @dma: use dma to transfer conversion result
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*
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* Start conversions for regular channels.
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* Also take care of normal or DMA mode. Circular DMA may be used for regular
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* conversions, in IIO buffer modes. Otherwise, use ADC interrupt with direct
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* DR read instead (e.g. read_raw, or triggered buffer mode without DMA).
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*/
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static void stm32_adc_start_conv(struct stm32_adc *adc, bool dma)
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{
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stm32_adc_set_bits(adc, STM32F4_ADC_CR1, STM32F4_SCAN);
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if (dma)
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stm32_adc_set_bits(adc, STM32F4_ADC_CR2,
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STM32F4_DMA | STM32F4_DDS);
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stm32_adc_set_bits(adc, STM32F4_ADC_CR2, STM32F4_EOCS | STM32F4_ADON);
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/* Wait for Power-up time (tSTAB from datasheet) */
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usleep_range(2, 3);
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/* Software start ? (e.g. trigger detection disabled ?) */
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if (!(stm32_adc_readl(adc, STM32F4_ADC_CR2) & STM32F4_EXTEN_MASK))
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stm32_adc_set_bits(adc, STM32F4_ADC_CR2, STM32F4_SWSTART);
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}
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static void stm32_adc_stop_conv(struct stm32_adc *adc)
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{
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stm32_adc_clr_bits(adc, STM32F4_ADC_CR2, STM32F4_EXTEN_MASK);
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stm32_adc_clr_bits(adc, STM32F4_ADC_SR, STM32F4_STRT);
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stm32_adc_clr_bits(adc, STM32F4_ADC_CR1, STM32F4_SCAN);
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stm32_adc_clr_bits(adc, STM32F4_ADC_CR2,
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STM32F4_ADON | STM32F4_DMA | STM32F4_DDS);
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}
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/**
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* stm32_adc_conf_scan_seq() - Build regular channels scan sequence
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* @indio_dev: IIO device
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* @scan_mask: channels to be converted
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*
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* Conversion sequence :
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* Configure ADC scan sequence based on selected channels in scan_mask.
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* Add channels to SQR registers, from scan_mask LSB to MSB, then
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* program sequence len.
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*/
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static int stm32_adc_conf_scan_seq(struct iio_dev *indio_dev,
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const unsigned long *scan_mask)
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{
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struct stm32_adc *adc = iio_priv(indio_dev);
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const struct iio_chan_spec *chan;
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u32 val, bit;
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int i = 0;
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for_each_set_bit(bit, scan_mask, indio_dev->masklength) {
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chan = indio_dev->channels + bit;
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/*
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* Assign one channel per SQ entry in regular
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* sequence, starting with SQ1.
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*/
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i++;
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if (i > STM32_ADC_MAX_SQ)
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return -EINVAL;
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dev_dbg(&indio_dev->dev, "%s chan %d to SQ%d\n",
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__func__, chan->channel, i);
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val = stm32_adc_readl(adc, stm32f4_sq[i].reg);
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val &= ~stm32f4_sq[i].mask;
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val |= chan->channel << stm32f4_sq[i].shift;
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stm32_adc_writel(adc, stm32f4_sq[i].reg, val);
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}
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if (!i)
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return -EINVAL;
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/* Sequence len */
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val = stm32_adc_readl(adc, stm32f4_sq[0].reg);
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val &= ~stm32f4_sq[0].mask;
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val |= ((i - 1) << stm32f4_sq[0].shift);
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stm32_adc_writel(adc, stm32f4_sq[0].reg, val);
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return 0;
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}
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/**
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* stm32_adc_get_trig_extsel() - Get external trigger selection
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* @trig: trigger
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*
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* Returns trigger extsel value, if trig matches, -EINVAL otherwise.
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*/
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static int stm32_adc_get_trig_extsel(struct iio_trigger *trig)
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{
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int i;
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/* lookup triggers registered by stm32 timer trigger driver */
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for (i = 0; stm32f4_adc_trigs[i].name; i++) {
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/**
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* Checking both stm32 timer trigger type and trig name
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* should be safe against arbitrary trigger names.
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*/
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if (is_stm32_timer_trigger(trig) &&
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!strcmp(stm32f4_adc_trigs[i].name, trig->name)) {
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return stm32f4_adc_trigs[i].extsel;
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}
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}
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return -EINVAL;
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}
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/**
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* stm32_adc_set_trig() - Set a regular trigger
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* @indio_dev: IIO device
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* @trig: IIO trigger
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*
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|
* Set trigger source/polarity (e.g. SW, or HW with polarity) :
|
|
* - if HW trigger disabled (e.g. trig == NULL, conversion launched by sw)
|
|
* - if HW trigger enabled, set source & polarity
|
|
*/
|
|
static int stm32_adc_set_trig(struct iio_dev *indio_dev,
|
|
struct iio_trigger *trig)
|
|
{
|
|
struct stm32_adc *adc = iio_priv(indio_dev);
|
|
u32 val, extsel = 0, exten = STM32_EXTEN_SWTRIG;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
if (trig) {
|
|
ret = stm32_adc_get_trig_extsel(trig);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* set trigger source and polarity (default to rising edge) */
|
|
extsel = ret;
|
|
exten = adc->trigger_polarity + STM32_EXTEN_HWTRIG_RISING_EDGE;
|
|
}
|
|
|
|
spin_lock_irqsave(&adc->lock, flags);
|
|
val = stm32_adc_readl(adc, STM32F4_ADC_CR2);
|
|
val &= ~(STM32F4_EXTEN_MASK | STM32F4_EXTSEL_MASK);
|
|
val |= exten << STM32F4_EXTEN_SHIFT;
|
|
val |= extsel << STM32F4_EXTSEL_SHIFT;
|
|
stm32_adc_writel(adc, STM32F4_ADC_CR2, val);
|
|
spin_unlock_irqrestore(&adc->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_adc_set_trig_pol(struct iio_dev *indio_dev,
|
|
const struct iio_chan_spec *chan,
|
|
unsigned int type)
|
|
{
|
|
struct stm32_adc *adc = iio_priv(indio_dev);
|
|
|
|
adc->trigger_polarity = type;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_adc_get_trig_pol(struct iio_dev *indio_dev,
|
|
const struct iio_chan_spec *chan)
|
|
{
|
|
struct stm32_adc *adc = iio_priv(indio_dev);
|
|
|
|
return adc->trigger_polarity;
|
|
}
|
|
|
|
static const char * const stm32_trig_pol_items[] = {
|
|
"rising-edge", "falling-edge", "both-edges",
|
|
};
|
|
|
|
static const struct iio_enum stm32_adc_trig_pol = {
|
|
.items = stm32_trig_pol_items,
|
|
.num_items = ARRAY_SIZE(stm32_trig_pol_items),
|
|
.get = stm32_adc_get_trig_pol,
|
|
.set = stm32_adc_set_trig_pol,
|
|
};
|
|
|
|
/**
|
|
* stm32_adc_single_conv() - Performs a single conversion
|
|
* @indio_dev: IIO device
|
|
* @chan: IIO channel
|
|
* @res: conversion result
|
|
*
|
|
* The function performs a single conversion on a given channel:
|
|
* - Program sequencer with one channel (e.g. in SQ1 with len = 1)
|
|
* - Use SW trigger
|
|
* - Start conversion, then wait for interrupt completion.
|
|
*/
|
|
static int stm32_adc_single_conv(struct iio_dev *indio_dev,
|
|
const struct iio_chan_spec *chan,
|
|
int *res)
|
|
{
|
|
struct stm32_adc *adc = iio_priv(indio_dev);
|
|
long timeout;
|
|
u32 val;
|
|
int ret;
|
|
|
|
reinit_completion(&adc->completion);
|
|
|
|
adc->bufi = 0;
|
|
|
|
/* Program chan number in regular sequence (SQ1) */
|
|
val = stm32_adc_readl(adc, stm32f4_sq[1].reg);
|
|
val &= ~stm32f4_sq[1].mask;
|
|
val |= chan->channel << stm32f4_sq[1].shift;
|
|
stm32_adc_writel(adc, stm32f4_sq[1].reg, val);
|
|
|
|
/* Set regular sequence len (0 for 1 conversion) */
|
|
stm32_adc_clr_bits(adc, stm32f4_sq[0].reg, stm32f4_sq[0].mask);
|
|
|
|
/* Trigger detection disabled (conversion can be launched in SW) */
|
|
stm32_adc_clr_bits(adc, STM32F4_ADC_CR2, STM32F4_EXTEN_MASK);
|
|
|
|
stm32_adc_conv_irq_enable(adc);
|
|
|
|
stm32_adc_start_conv(adc, false);
|
|
|
|
timeout = wait_for_completion_interruptible_timeout(
|
|
&adc->completion, STM32_ADC_TIMEOUT);
|
|
if (timeout == 0) {
|
|
ret = -ETIMEDOUT;
|
|
} else if (timeout < 0) {
|
|
ret = timeout;
|
|
} else {
|
|
*res = adc->buffer[0];
|
|
ret = IIO_VAL_INT;
|
|
}
|
|
|
|
stm32_adc_stop_conv(adc);
|
|
|
|
stm32_adc_conv_irq_disable(adc);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int stm32_adc_read_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int *val, int *val2, long mask)
|
|
{
|
|
struct stm32_adc *adc = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
ret = iio_device_claim_direct_mode(indio_dev);
|
|
if (ret)
|
|
return ret;
|
|
if (chan->type == IIO_VOLTAGE)
|
|
ret = stm32_adc_single_conv(indio_dev, chan, val);
|
|
else
|
|
ret = -EINVAL;
|
|
iio_device_release_direct_mode(indio_dev);
|
|
return ret;
|
|
|
|
case IIO_CHAN_INFO_SCALE:
|
|
*val = adc->common->vref_mv;
|
|
*val2 = chan->scan_type.realbits;
|
|
return IIO_VAL_FRACTIONAL_LOG2;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static irqreturn_t stm32_adc_isr(int irq, void *data)
|
|
{
|
|
struct stm32_adc *adc = data;
|
|
struct iio_dev *indio_dev = iio_priv_to_dev(adc);
|
|
u32 status = stm32_adc_readl(adc, STM32F4_ADC_SR);
|
|
|
|
if (status & STM32F4_EOC) {
|
|
/* Reading DR also clears EOC status flag */
|
|
adc->buffer[adc->bufi] = stm32_adc_readw(adc, STM32F4_ADC_DR);
|
|
if (iio_buffer_enabled(indio_dev)) {
|
|
adc->bufi++;
|
|
if (adc->bufi >= adc->num_conv) {
|
|
stm32_adc_conv_irq_disable(adc);
|
|
iio_trigger_poll(indio_dev->trig);
|
|
}
|
|
} else {
|
|
complete(&adc->completion);
|
|
}
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
/**
|
|
* stm32_adc_validate_trigger() - validate trigger for stm32 adc
|
|
* @indio_dev: IIO device
|
|
* @trig: new trigger
|
|
*
|
|
* Returns: 0 if trig matches one of the triggers registered by stm32 adc
|
|
* driver, -EINVAL otherwise.
|
|
*/
|
|
static int stm32_adc_validate_trigger(struct iio_dev *indio_dev,
|
|
struct iio_trigger *trig)
|
|
{
|
|
return stm32_adc_get_trig_extsel(trig) < 0 ? -EINVAL : 0;
|
|
}
|
|
|
|
static int stm32_adc_set_watermark(struct iio_dev *indio_dev, unsigned int val)
|
|
{
|
|
struct stm32_adc *adc = iio_priv(indio_dev);
|
|
unsigned int watermark = STM32_DMA_BUFFER_SIZE / 2;
|
|
|
|
/*
|
|
* dma cyclic transfers are used, buffer is split into two periods.
|
|
* There should be :
|
|
* - always one buffer (period) dma is working on
|
|
* - one buffer (period) driver can push with iio_trigger_poll().
|
|
*/
|
|
watermark = min(watermark, val * (unsigned)(sizeof(u16)));
|
|
adc->rx_buf_sz = watermark * 2;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_adc_update_scan_mode(struct iio_dev *indio_dev,
|
|
const unsigned long *scan_mask)
|
|
{
|
|
struct stm32_adc *adc = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
adc->num_conv = bitmap_weight(scan_mask, indio_dev->masklength);
|
|
|
|
ret = stm32_adc_conf_scan_seq(indio_dev, scan_mask);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_adc_of_xlate(struct iio_dev *indio_dev,
|
|
const struct of_phandle_args *iiospec)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < indio_dev->num_channels; i++)
|
|
if (indio_dev->channels[i].channel == iiospec->args[0])
|
|
return i;
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* stm32_adc_debugfs_reg_access - read or write register value
|
|
*
|
|
* To read a value from an ADC register:
|
|
* echo [ADC reg offset] > direct_reg_access
|
|
* cat direct_reg_access
|
|
*
|
|
* To write a value in a ADC register:
|
|
* echo [ADC_reg_offset] [value] > direct_reg_access
|
|
*/
|
|
static int stm32_adc_debugfs_reg_access(struct iio_dev *indio_dev,
|
|
unsigned reg, unsigned writeval,
|
|
unsigned *readval)
|
|
{
|
|
struct stm32_adc *adc = iio_priv(indio_dev);
|
|
|
|
if (!readval)
|
|
stm32_adc_writel(adc, reg, writeval);
|
|
else
|
|
*readval = stm32_adc_readl(adc, reg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct iio_info stm32_adc_iio_info = {
|
|
.read_raw = stm32_adc_read_raw,
|
|
.validate_trigger = stm32_adc_validate_trigger,
|
|
.hwfifo_set_watermark = stm32_adc_set_watermark,
|
|
.update_scan_mode = stm32_adc_update_scan_mode,
|
|
.debugfs_reg_access = stm32_adc_debugfs_reg_access,
|
|
.of_xlate = stm32_adc_of_xlate,
|
|
.driver_module = THIS_MODULE,
|
|
};
|
|
|
|
static unsigned int stm32_adc_dma_residue(struct stm32_adc *adc)
|
|
{
|
|
struct dma_tx_state state;
|
|
enum dma_status status;
|
|
|
|
status = dmaengine_tx_status(adc->dma_chan,
|
|
adc->dma_chan->cookie,
|
|
&state);
|
|
if (status == DMA_IN_PROGRESS) {
|
|
/* Residue is size in bytes from end of buffer */
|
|
unsigned int i = adc->rx_buf_sz - state.residue;
|
|
unsigned int size;
|
|
|
|
/* Return available bytes */
|
|
if (i >= adc->bufi)
|
|
size = i - adc->bufi;
|
|
else
|
|
size = adc->rx_buf_sz + i - adc->bufi;
|
|
|
|
return size;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void stm32_adc_dma_buffer_done(void *data)
|
|
{
|
|
struct iio_dev *indio_dev = data;
|
|
|
|
iio_trigger_poll_chained(indio_dev->trig);
|
|
}
|
|
|
|
static int stm32_adc_dma_start(struct iio_dev *indio_dev)
|
|
{
|
|
struct stm32_adc *adc = iio_priv(indio_dev);
|
|
struct dma_async_tx_descriptor *desc;
|
|
dma_cookie_t cookie;
|
|
int ret;
|
|
|
|
if (!adc->dma_chan)
|
|
return 0;
|
|
|
|
dev_dbg(&indio_dev->dev, "%s size=%d watermark=%d\n", __func__,
|
|
adc->rx_buf_sz, adc->rx_buf_sz / 2);
|
|
|
|
/* Prepare a DMA cyclic transaction */
|
|
desc = dmaengine_prep_dma_cyclic(adc->dma_chan,
|
|
adc->rx_dma_buf,
|
|
adc->rx_buf_sz, adc->rx_buf_sz / 2,
|
|
DMA_DEV_TO_MEM,
|
|
DMA_PREP_INTERRUPT);
|
|
if (!desc)
|
|
return -EBUSY;
|
|
|
|
desc->callback = stm32_adc_dma_buffer_done;
|
|
desc->callback_param = indio_dev;
|
|
|
|
cookie = dmaengine_submit(desc);
|
|
ret = dma_submit_error(cookie);
|
|
if (ret) {
|
|
dmaengine_terminate_all(adc->dma_chan);
|
|
return ret;
|
|
}
|
|
|
|
/* Issue pending DMA requests */
|
|
dma_async_issue_pending(adc->dma_chan);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_adc_buffer_postenable(struct iio_dev *indio_dev)
|
|
{
|
|
struct stm32_adc *adc = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
ret = stm32_adc_set_trig(indio_dev, indio_dev->trig);
|
|
if (ret) {
|
|
dev_err(&indio_dev->dev, "Can't set trigger\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = stm32_adc_dma_start(indio_dev);
|
|
if (ret) {
|
|
dev_err(&indio_dev->dev, "Can't start dma\n");
|
|
goto err_clr_trig;
|
|
}
|
|
|
|
ret = iio_triggered_buffer_postenable(indio_dev);
|
|
if (ret < 0)
|
|
goto err_stop_dma;
|
|
|
|
/* Reset adc buffer index */
|
|
adc->bufi = 0;
|
|
|
|
if (!adc->dma_chan)
|
|
stm32_adc_conv_irq_enable(adc);
|
|
|
|
stm32_adc_start_conv(adc, !!adc->dma_chan);
|
|
|
|
return 0;
|
|
|
|
err_stop_dma:
|
|
if (adc->dma_chan)
|
|
dmaengine_terminate_all(adc->dma_chan);
|
|
err_clr_trig:
|
|
stm32_adc_set_trig(indio_dev, NULL);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int stm32_adc_buffer_predisable(struct iio_dev *indio_dev)
|
|
{
|
|
struct stm32_adc *adc = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
stm32_adc_stop_conv(adc);
|
|
if (!adc->dma_chan)
|
|
stm32_adc_conv_irq_disable(adc);
|
|
|
|
ret = iio_triggered_buffer_predisable(indio_dev);
|
|
if (ret < 0)
|
|
dev_err(&indio_dev->dev, "predisable failed\n");
|
|
|
|
if (adc->dma_chan)
|
|
dmaengine_terminate_all(adc->dma_chan);
|
|
|
|
if (stm32_adc_set_trig(indio_dev, NULL))
|
|
dev_err(&indio_dev->dev, "Can't clear trigger\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct iio_buffer_setup_ops stm32_adc_buffer_setup_ops = {
|
|
.postenable = &stm32_adc_buffer_postenable,
|
|
.predisable = &stm32_adc_buffer_predisable,
|
|
};
|
|
|
|
static irqreturn_t stm32_adc_trigger_handler(int irq, void *p)
|
|
{
|
|
struct iio_poll_func *pf = p;
|
|
struct iio_dev *indio_dev = pf->indio_dev;
|
|
struct stm32_adc *adc = iio_priv(indio_dev);
|
|
|
|
dev_dbg(&indio_dev->dev, "%s bufi=%d\n", __func__, adc->bufi);
|
|
|
|
if (!adc->dma_chan) {
|
|
/* reset buffer index */
|
|
adc->bufi = 0;
|
|
iio_push_to_buffers_with_timestamp(indio_dev, adc->buffer,
|
|
pf->timestamp);
|
|
} else {
|
|
int residue = stm32_adc_dma_residue(adc);
|
|
|
|
while (residue >= indio_dev->scan_bytes) {
|
|
u16 *buffer = (u16 *)&adc->rx_buf[adc->bufi];
|
|
|
|
iio_push_to_buffers_with_timestamp(indio_dev, buffer,
|
|
pf->timestamp);
|
|
residue -= indio_dev->scan_bytes;
|
|
adc->bufi += indio_dev->scan_bytes;
|
|
if (adc->bufi >= adc->rx_buf_sz)
|
|
adc->bufi = 0;
|
|
}
|
|
}
|
|
|
|
iio_trigger_notify_done(indio_dev->trig);
|
|
|
|
/* re-enable eoc irq */
|
|
if (!adc->dma_chan)
|
|
stm32_adc_conv_irq_enable(adc);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static const struct iio_chan_spec_ext_info stm32_adc_ext_info[] = {
|
|
IIO_ENUM("trigger_polarity", IIO_SHARED_BY_ALL, &stm32_adc_trig_pol),
|
|
{
|
|
.name = "trigger_polarity_available",
|
|
.shared = IIO_SHARED_BY_ALL,
|
|
.read = iio_enum_available_read,
|
|
.private = (uintptr_t)&stm32_adc_trig_pol,
|
|
},
|
|
{},
|
|
};
|
|
|
|
static int stm32_adc_of_get_resolution(struct iio_dev *indio_dev)
|
|
{
|
|
struct device_node *node = indio_dev->dev.of_node;
|
|
struct stm32_adc *adc = iio_priv(indio_dev);
|
|
unsigned int i;
|
|
u32 res;
|
|
|
|
if (of_property_read_u32(node, "assigned-resolution-bits", &res))
|
|
res = stm32f4_adc_resolutions[0];
|
|
|
|
for (i = 0; i < ARRAY_SIZE(stm32f4_adc_resolutions); i++)
|
|
if (res == stm32f4_adc_resolutions[i])
|
|
break;
|
|
if (i >= ARRAY_SIZE(stm32f4_adc_resolutions)) {
|
|
dev_err(&indio_dev->dev, "Bad resolution: %u bits\n", res);
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev_dbg(&indio_dev->dev, "Using %u bits resolution\n", res);
|
|
adc->res = i;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void stm32_adc_chan_init_one(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec *chan,
|
|
const struct stm32_adc_chan_spec *channel,
|
|
int scan_index)
|
|
{
|
|
struct stm32_adc *adc = iio_priv(indio_dev);
|
|
|
|
chan->type = channel->type;
|
|
chan->channel = channel->channel;
|
|
chan->datasheet_name = channel->name;
|
|
chan->scan_index = scan_index;
|
|
chan->indexed = 1;
|
|
chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
|
|
chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE);
|
|
chan->scan_type.sign = 'u';
|
|
chan->scan_type.realbits = stm32f4_adc_resolutions[adc->res];
|
|
chan->scan_type.storagebits = 16;
|
|
chan->ext_info = stm32_adc_ext_info;
|
|
}
|
|
|
|
static int stm32_adc_chan_of_init(struct iio_dev *indio_dev)
|
|
{
|
|
struct device_node *node = indio_dev->dev.of_node;
|
|
struct property *prop;
|
|
const __be32 *cur;
|
|
struct iio_chan_spec *channels;
|
|
int scan_index = 0, num_channels;
|
|
u32 val;
|
|
|
|
num_channels = of_property_count_u32_elems(node, "st,adc-channels");
|
|
if (num_channels < 0 ||
|
|
num_channels >= ARRAY_SIZE(stm32f4_adc123_channels)) {
|
|
dev_err(&indio_dev->dev, "Bad st,adc-channels?\n");
|
|
return num_channels < 0 ? num_channels : -EINVAL;
|
|
}
|
|
|
|
channels = devm_kcalloc(&indio_dev->dev, num_channels,
|
|
sizeof(struct iio_chan_spec), GFP_KERNEL);
|
|
if (!channels)
|
|
return -ENOMEM;
|
|
|
|
of_property_for_each_u32(node, "st,adc-channels", prop, cur, val) {
|
|
if (val >= ARRAY_SIZE(stm32f4_adc123_channels)) {
|
|
dev_err(&indio_dev->dev, "Invalid channel %d\n", val);
|
|
return -EINVAL;
|
|
}
|
|
stm32_adc_chan_init_one(indio_dev, &channels[scan_index],
|
|
&stm32f4_adc123_channels[val],
|
|
scan_index);
|
|
scan_index++;
|
|
}
|
|
|
|
indio_dev->num_channels = scan_index;
|
|
indio_dev->channels = channels;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_adc_dma_request(struct iio_dev *indio_dev)
|
|
{
|
|
struct stm32_adc *adc = iio_priv(indio_dev);
|
|
struct dma_slave_config config;
|
|
int ret;
|
|
|
|
adc->dma_chan = dma_request_slave_channel(&indio_dev->dev, "rx");
|
|
if (!adc->dma_chan)
|
|
return 0;
|
|
|
|
adc->rx_buf = dma_alloc_coherent(adc->dma_chan->device->dev,
|
|
STM32_DMA_BUFFER_SIZE,
|
|
&adc->rx_dma_buf, GFP_KERNEL);
|
|
if (!adc->rx_buf) {
|
|
ret = -ENOMEM;
|
|
goto err_release;
|
|
}
|
|
|
|
/* Configure DMA channel to read data register */
|
|
memset(&config, 0, sizeof(config));
|
|
config.src_addr = (dma_addr_t)adc->common->phys_base;
|
|
config.src_addr += adc->offset + STM32F4_ADC_DR;
|
|
config.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
|
|
|
|
ret = dmaengine_slave_config(adc->dma_chan, &config);
|
|
if (ret)
|
|
goto err_free;
|
|
|
|
return 0;
|
|
|
|
err_free:
|
|
dma_free_coherent(adc->dma_chan->device->dev, STM32_DMA_BUFFER_SIZE,
|
|
adc->rx_buf, adc->rx_dma_buf);
|
|
err_release:
|
|
dma_release_channel(adc->dma_chan);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int stm32_adc_probe(struct platform_device *pdev)
|
|
{
|
|
struct iio_dev *indio_dev;
|
|
struct stm32_adc *adc;
|
|
int ret;
|
|
|
|
if (!pdev->dev.of_node)
|
|
return -ENODEV;
|
|
|
|
indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
|
|
adc = iio_priv(indio_dev);
|
|
adc->common = dev_get_drvdata(pdev->dev.parent);
|
|
spin_lock_init(&adc->lock);
|
|
init_completion(&adc->completion);
|
|
|
|
indio_dev->name = dev_name(&pdev->dev);
|
|
indio_dev->dev.parent = &pdev->dev;
|
|
indio_dev->dev.of_node = pdev->dev.of_node;
|
|
indio_dev->info = &stm32_adc_iio_info;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
platform_set_drvdata(pdev, adc);
|
|
|
|
ret = of_property_read_u32(pdev->dev.of_node, "reg", &adc->offset);
|
|
if (ret != 0) {
|
|
dev_err(&pdev->dev, "missing reg property\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
adc->irq = platform_get_irq(pdev, 0);
|
|
if (adc->irq < 0) {
|
|
dev_err(&pdev->dev, "failed to get irq\n");
|
|
return adc->irq;
|
|
}
|
|
|
|
ret = devm_request_irq(&pdev->dev, adc->irq, stm32_adc_isr,
|
|
0, pdev->name, adc);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to request IRQ\n");
|
|
return ret;
|
|
}
|
|
|
|
adc->clk = devm_clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(adc->clk)) {
|
|
dev_err(&pdev->dev, "Can't get clock\n");
|
|
return PTR_ERR(adc->clk);
|
|
}
|
|
|
|
ret = clk_prepare_enable(adc->clk);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "clk enable failed\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = stm32_adc_of_get_resolution(indio_dev);
|
|
if (ret < 0)
|
|
goto err_clk_disable;
|
|
stm32_adc_set_res(adc);
|
|
|
|
ret = stm32_adc_chan_of_init(indio_dev);
|
|
if (ret < 0)
|
|
goto err_clk_disable;
|
|
|
|
ret = stm32_adc_dma_request(indio_dev);
|
|
if (ret < 0)
|
|
goto err_clk_disable;
|
|
|
|
ret = iio_triggered_buffer_setup(indio_dev,
|
|
&iio_pollfunc_store_time,
|
|
&stm32_adc_trigger_handler,
|
|
&stm32_adc_buffer_setup_ops);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "buffer setup failed\n");
|
|
goto err_dma_disable;
|
|
}
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "iio dev register failed\n");
|
|
goto err_buffer_cleanup;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_buffer_cleanup:
|
|
iio_triggered_buffer_cleanup(indio_dev);
|
|
|
|
err_dma_disable:
|
|
if (adc->dma_chan) {
|
|
dma_free_coherent(adc->dma_chan->device->dev,
|
|
STM32_DMA_BUFFER_SIZE,
|
|
adc->rx_buf, adc->rx_dma_buf);
|
|
dma_release_channel(adc->dma_chan);
|
|
}
|
|
err_clk_disable:
|
|
clk_disable_unprepare(adc->clk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int stm32_adc_remove(struct platform_device *pdev)
|
|
{
|
|
struct stm32_adc *adc = platform_get_drvdata(pdev);
|
|
struct iio_dev *indio_dev = iio_priv_to_dev(adc);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
iio_triggered_buffer_cleanup(indio_dev);
|
|
if (adc->dma_chan) {
|
|
dma_free_coherent(adc->dma_chan->device->dev,
|
|
STM32_DMA_BUFFER_SIZE,
|
|
adc->rx_buf, adc->rx_dma_buf);
|
|
dma_release_channel(adc->dma_chan);
|
|
}
|
|
clk_disable_unprepare(adc->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id stm32_adc_of_match[] = {
|
|
{ .compatible = "st,stm32f4-adc" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, stm32_adc_of_match);
|
|
|
|
static struct platform_driver stm32_adc_driver = {
|
|
.probe = stm32_adc_probe,
|
|
.remove = stm32_adc_remove,
|
|
.driver = {
|
|
.name = "stm32-adc",
|
|
.of_match_table = stm32_adc_of_match,
|
|
},
|
|
};
|
|
module_platform_driver(stm32_adc_driver);
|
|
|
|
MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>");
|
|
MODULE_DESCRIPTION("STMicroelectronics STM32 ADC IIO driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:stm32-adc");
|