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adc: add Amlogic Meson SAR ADC driver
This patch adds the driver for the Amlogic Meson Successive Approximation Register (SAR) A/D Converter based on the Linux IIO driver thanks to the great work of Martin Blumenstingl. The driver has been adapted to U-Boot and the ADC UClass. This patch depends on the regmap "regmap: add regmap_update_bits() helper" patch and has been tested using the newly introducted "adc" CLI command in the "cmd: add ADC cli commands" patch. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
This commit is contained in:
Neil Armstrong
Tom Rini
parent
e068512ca6
commit
59beb238d5
@ -29,6 +29,16 @@ config ADC_SANDBOX
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- 16-bit resolution
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- single and multi-channel conversion mode
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config SARADC_MESON
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bool "Enable Amlogic Meson SARADC driver"
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imply REGMAP
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help
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This enables driver for Amlogic Meson SARADC.
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It provides:
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- 8 analog input channels
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- 1O or 12 bits resolution
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- Up to 1MSPS of sample rate
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config SARADC_ROCKCHIP
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bool "Enable Rockchip SARADC driver"
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help
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@ -9,3 +9,4 @@ obj-$(CONFIG_ADC) += adc-uclass.o
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obj-$(CONFIG_ADC_EXYNOS) += exynos-adc.o
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obj-$(CONFIG_ADC_SANDBOX) += sandbox.o
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obj-$(CONFIG_SARADC_ROCKCHIP) += rockchip-saradc.o
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obj-$(CONFIG_SARADC_MESON) += meson-saradc.o
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723
drivers/adc/meson-saradc.c
Normal file
723
drivers/adc/meson-saradc.c
Normal file
@ -0,0 +1,723 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
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* Copyright (C) 2018 BayLibre, SAS
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* Author: Neil Armstrong <narmstrong@baylibre.com>
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*
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* Amlogic Meson Successive Approximation Register (SAR) A/D Converter
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*/
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#include <common.h>
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#include <adc.h>
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#include <clk.h>
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#include <dm.h>
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#include <regmap.h>
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#include <errno.h>
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#include <asm/io.h>
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#include <linux/math64.h>
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#include <linux/bitfield.h>
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#define MESON_SAR_ADC_REG0 0x00
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#define MESON_SAR_ADC_REG0_PANEL_DETECT BIT(31)
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#define MESON_SAR_ADC_REG0_BUSY_MASK GENMASK(30, 28)
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#define MESON_SAR_ADC_REG0_DELTA_BUSY BIT(30)
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#define MESON_SAR_ADC_REG0_AVG_BUSY BIT(29)
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#define MESON_SAR_ADC_REG0_SAMPLE_BUSY BIT(28)
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#define MESON_SAR_ADC_REG0_FIFO_FULL BIT(27)
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#define MESON_SAR_ADC_REG0_FIFO_EMPTY BIT(26)
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#define MESON_SAR_ADC_REG0_FIFO_COUNT_MASK GENMASK(25, 21)
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#define MESON_SAR_ADC_REG0_ADC_BIAS_CTRL_MASK GENMASK(20, 19)
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#define MESON_SAR_ADC_REG0_CURR_CHAN_ID_MASK GENMASK(18, 16)
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#define MESON_SAR_ADC_REG0_ADC_TEMP_SEN_SEL BIT(15)
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#define MESON_SAR_ADC_REG0_SAMPLING_STOP BIT(14)
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#define MESON_SAR_ADC_REG0_CHAN_DELTA_EN_MASK GENMASK(13, 12)
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#define MESON_SAR_ADC_REG0_DETECT_IRQ_POL BIT(10)
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#define MESON_SAR_ADC_REG0_DETECT_IRQ_EN BIT(9)
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#define MESON_SAR_ADC_REG0_FIFO_CNT_IRQ_MASK GENMASK(8, 4)
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#define MESON_SAR_ADC_REG0_FIFO_IRQ_EN BIT(3)
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#define MESON_SAR_ADC_REG0_SAMPLING_START BIT(2)
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#define MESON_SAR_ADC_REG0_CONTINUOUS_EN BIT(1)
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#define MESON_SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE BIT(0)
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#define MESON_SAR_ADC_CHAN_LIST 0x04
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#define MESON_SAR_ADC_CHAN_LIST_MAX_INDEX_MASK GENMASK(26, 24)
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#define MESON_SAR_ADC_CHAN_LIST_ENTRY_MASK(_chan) \
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(GENMASK(2, 0) << ((_chan) * 3))
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#define MESON_SAR_ADC_AVG_CNTL 0x08
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#define MESON_SAR_ADC_AVG_CNTL_AVG_MODE_SHIFT(_chan) \
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(16 + ((_chan) * 2))
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#define MESON_SAR_ADC_AVG_CNTL_AVG_MODE_MASK(_chan) \
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(GENMASK(17, 16) << ((_chan) * 2))
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#define MESON_SAR_ADC_AVG_CNTL_NUM_SAMPLES_SHIFT(_chan) \
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(0 + ((_chan) * 2))
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#define MESON_SAR_ADC_AVG_CNTL_NUM_SAMPLES_MASK(_chan) \
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(GENMASK(1, 0) << ((_chan) * 2))
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#define MESON_SAR_ADC_REG3 0x0c
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#define MESON_SAR_ADC_REG3_CNTL_USE_SC_DLY BIT(31)
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#define MESON_SAR_ADC_REG3_CLK_EN BIT(30)
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#define MESON_SAR_ADC_REG3_BL30_INITIALIZED BIT(28)
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#define MESON_SAR_ADC_REG3_CTRL_CONT_RING_COUNTER_EN BIT(27)
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#define MESON_SAR_ADC_REG3_CTRL_SAMPLING_CLOCK_PHASE BIT(26)
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#define MESON_SAR_ADC_REG3_CTRL_CHAN7_MUX_SEL_MASK GENMASK(25, 23)
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#define MESON_SAR_ADC_REG3_DETECT_EN BIT(22)
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#define MESON_SAR_ADC_REG3_ADC_EN BIT(21)
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#define MESON_SAR_ADC_REG3_PANEL_DETECT_COUNT_MASK GENMASK(20, 18)
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#define MESON_SAR_ADC_REG3_PANEL_DETECT_FILTER_TB_MASK GENMASK(17, 16)
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#define MESON_SAR_ADC_REG3_ADC_CLK_DIV_SHIFT 10
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#define MESON_SAR_ADC_REG3_ADC_CLK_DIV_WIDTH 5
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#define MESON_SAR_ADC_REG3_BLOCK_DLY_SEL_MASK GENMASK(9, 8)
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#define MESON_SAR_ADC_REG3_BLOCK_DLY_MASK GENMASK(7, 0)
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#define MESON_SAR_ADC_DELAY 0x10
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#define MESON_SAR_ADC_DELAY_INPUT_DLY_SEL_MASK GENMASK(25, 24)
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#define MESON_SAR_ADC_DELAY_BL30_BUSY BIT(15)
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#define MESON_SAR_ADC_DELAY_KERNEL_BUSY BIT(14)
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#define MESON_SAR_ADC_DELAY_INPUT_DLY_CNT_MASK GENMASK(23, 16)
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#define MESON_SAR_ADC_DELAY_SAMPLE_DLY_SEL_MASK GENMASK(9, 8)
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#define MESON_SAR_ADC_DELAY_SAMPLE_DLY_CNT_MASK GENMASK(7, 0)
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#define MESON_SAR_ADC_LAST_RD 0x14
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#define MESON_SAR_ADC_LAST_RD_LAST_CHANNEL1_MASK GENMASK(23, 16)
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#define MESON_SAR_ADC_LAST_RD_LAST_CHANNEL0_MASK GENMASK(9, 0)
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#define MESON_SAR_ADC_FIFO_RD 0x18
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#define MESON_SAR_ADC_FIFO_RD_CHAN_ID_MASK GENMASK(14, 12)
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#define MESON_SAR_ADC_FIFO_RD_SAMPLE_VALUE_MASK GENMASK(11, 0)
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#define MESON_SAR_ADC_AUX_SW 0x1c
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#define MESON_SAR_ADC_AUX_SW_MUX_SEL_CHAN_SHIFT(_chan) \
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(8 + (((_chan) - 2) * 3))
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#define MESON_SAR_ADC_AUX_SW_VREF_P_MUX BIT(6)
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#define MESON_SAR_ADC_AUX_SW_VREF_N_MUX BIT(5)
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#define MESON_SAR_ADC_AUX_SW_MODE_SEL BIT(4)
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#define MESON_SAR_ADC_AUX_SW_YP_DRIVE_SW BIT(3)
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#define MESON_SAR_ADC_AUX_SW_XP_DRIVE_SW BIT(2)
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#define MESON_SAR_ADC_AUX_SW_YM_DRIVE_SW BIT(1)
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#define MESON_SAR_ADC_AUX_SW_XM_DRIVE_SW BIT(0)
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#define MESON_SAR_ADC_CHAN_10_SW 0x20
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#define MESON_SAR_ADC_CHAN_10_SW_CHAN1_MUX_SEL_MASK GENMASK(25, 23)
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#define MESON_SAR_ADC_CHAN_10_SW_CHAN1_VREF_P_MUX BIT(22)
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#define MESON_SAR_ADC_CHAN_10_SW_CHAN1_VREF_N_MUX BIT(21)
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#define MESON_SAR_ADC_CHAN_10_SW_CHAN1_MODE_SEL BIT(20)
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#define MESON_SAR_ADC_CHAN_10_SW_CHAN1_YP_DRIVE_SW BIT(19)
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#define MESON_SAR_ADC_CHAN_10_SW_CHAN1_XP_DRIVE_SW BIT(18)
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#define MESON_SAR_ADC_CHAN_10_SW_CHAN1_YM_DRIVE_SW BIT(17)
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#define MESON_SAR_ADC_CHAN_10_SW_CHAN1_XM_DRIVE_SW BIT(16)
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#define MESON_SAR_ADC_CHAN_10_SW_CHAN0_MUX_SEL_MASK GENMASK(9, 7)
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#define MESON_SAR_ADC_CHAN_10_SW_CHAN0_VREF_P_MUX BIT(6)
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#define MESON_SAR_ADC_CHAN_10_SW_CHAN0_VREF_N_MUX BIT(5)
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#define MESON_SAR_ADC_CHAN_10_SW_CHAN0_MODE_SEL BIT(4)
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#define MESON_SAR_ADC_CHAN_10_SW_CHAN0_YP_DRIVE_SW BIT(3)
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#define MESON_SAR_ADC_CHAN_10_SW_CHAN0_XP_DRIVE_SW BIT(2)
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#define MESON_SAR_ADC_CHAN_10_SW_CHAN0_YM_DRIVE_SW BIT(1)
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#define MESON_SAR_ADC_CHAN_10_SW_CHAN0_XM_DRIVE_SW BIT(0)
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#define MESON_SAR_ADC_DETECT_IDLE_SW 0x24
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#define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_SW_EN BIT(26)
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#define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_MUX_MASK GENMASK(25, 23)
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#define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_VREF_P_MUX BIT(22)
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#define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_VREF_N_MUX BIT(21)
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#define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_MODE_SEL BIT(20)
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#define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_YP_DRIVE_SW BIT(19)
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#define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_XP_DRIVE_SW BIT(18)
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#define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_YM_DRIVE_SW BIT(17)
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#define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_XM_DRIVE_SW BIT(16)
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#define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_MUX_SEL_MASK GENMASK(9, 7)
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#define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_VREF_P_MUX BIT(6)
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#define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_VREF_N_MUX BIT(5)
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#define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_MODE_SEL BIT(4)
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#define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_YP_DRIVE_SW BIT(3)
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#define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_XP_DRIVE_SW BIT(2)
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#define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_YM_DRIVE_SW BIT(1)
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#define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_XM_DRIVE_SW BIT(0)
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#define MESON_SAR_ADC_DELTA_10 0x28
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#define MESON_SAR_ADC_DELTA_10_TEMP_SEL BIT(27)
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#define MESON_SAR_ADC_DELTA_10_TS_REVE1 BIT(26)
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#define MESON_SAR_ADC_DELTA_10_CHAN1_DELTA_VALUE_MASK GENMASK(25, 16)
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#define MESON_SAR_ADC_DELTA_10_TS_REVE0 BIT(15)
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#define MESON_SAR_ADC_DELTA_10_TS_C_SHIFT 11
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#define MESON_SAR_ADC_DELTA_10_TS_C_MASK GENMASK(14, 11)
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#define MESON_SAR_ADC_DELTA_10_TS_VBG_EN BIT(10)
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#define MESON_SAR_ADC_DELTA_10_CHAN0_DELTA_VALUE_MASK GENMASK(9, 0)
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/*
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* NOTE: registers from here are undocumented (the vendor Linux kernel driver
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* and u-boot source served as reference). These only seem to be relevant on
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* GXBB and newer.
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*/
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#define MESON_SAR_ADC_REG11 0x2c
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#define MESON_SAR_ADC_REG11_BANDGAP_EN BIT(13)
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#define MESON_SAR_ADC_REG13 0x34
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#define MESON_SAR_ADC_REG13_12BIT_CALIBRATION_MASK GENMASK(13, 8)
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#define MESON_SAR_ADC_MAX_FIFO_SIZE 32
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#define MESON_SAR_ADC_TIMEOUT 100 /* ms */
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#define NUM_CHANNELS 8
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#define MILLION 1000000
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struct meson_saradc_data {
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int num_bits;
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};
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struct meson_saradc_priv {
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const struct meson_saradc_data *data;
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struct regmap *regmap;
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struct clk core_clk;
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struct clk adc_clk;
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bool initialized;
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int active_channel;
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int calibbias;
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int calibscale;
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};
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static unsigned int
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meson_saradc_get_fifo_count(struct meson_saradc_priv *priv)
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{
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u32 regval;
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regmap_read(priv->regmap, MESON_SAR_ADC_REG0, ®val);
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return FIELD_GET(MESON_SAR_ADC_REG0_FIFO_COUNT_MASK, regval);
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}
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static int meson_saradc_lock(struct meson_saradc_priv *priv)
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{
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uint val, timeout = 10000;
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/* prevent BL30 from using the SAR ADC while we are using it */
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regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY,
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MESON_SAR_ADC_DELAY_KERNEL_BUSY,
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MESON_SAR_ADC_DELAY_KERNEL_BUSY);
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/*
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* wait until BL30 releases it's lock (so we can use the SAR ADC)
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*/
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do {
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udelay(1);
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regmap_read(priv->regmap, MESON_SAR_ADC_DELAY, &val);
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} while (val & MESON_SAR_ADC_DELAY_BL30_BUSY && timeout--);
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if (timeout < 0) {
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printf("Timeout while waiting for BL30 unlock\n");
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return -ETIMEDOUT;
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}
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return 0;
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}
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static void meson_saradc_unlock(struct meson_saradc_priv *priv)
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{
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/* allow BL30 to use the SAR ADC again */
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regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY,
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MESON_SAR_ADC_DELAY_KERNEL_BUSY, 0);
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}
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static void meson_saradc_clear_fifo(struct meson_saradc_priv *priv)
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{
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unsigned int count, tmp;
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for (count = 0; count < MESON_SAR_ADC_MAX_FIFO_SIZE; count++) {
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if (!meson_saradc_get_fifo_count(priv))
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break;
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regmap_read(priv->regmap, MESON_SAR_ADC_FIFO_RD, &tmp);
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}
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}
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static int meson_saradc_calib_val(struct meson_saradc_priv *priv, int val)
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{
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int tmp;
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/* use val_calib = scale * val_raw + offset calibration function */
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tmp = div_s64((s64)val * priv->calibscale, MILLION) + priv->calibbias;
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return clamp(tmp, 0, (1 << priv->data->num_bits) - 1);
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}
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static int meson_saradc_wait_busy_clear(struct meson_saradc_priv *priv)
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{
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uint regval, timeout = 10000;
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/*
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* NOTE: we need a small delay before reading the status, otherwise
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* the sample engine may not have started internally (which would
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* seem to us that sampling is already finished).
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*/
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do {
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udelay(1);
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regmap_read(priv->regmap, MESON_SAR_ADC_REG0, ®val);
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} while (FIELD_GET(MESON_SAR_ADC_REG0_BUSY_MASK, regval) && timeout--);
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if (timeout < 0)
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return -ETIMEDOUT;
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return 0;
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}
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static int meson_saradc_read_raw_sample(struct meson_saradc_priv *priv,
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unsigned int channel, uint *val)
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{
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uint regval, fifo_chan, fifo_val, count;
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int ret;
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ret = meson_saradc_wait_busy_clear(priv);
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if (ret)
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return ret;
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count = meson_saradc_get_fifo_count(priv);
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if (count != 1) {
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printf("ADC FIFO has %d element(s) instead of one\n", count);
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return -EINVAL;
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}
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regmap_read(priv->regmap, MESON_SAR_ADC_FIFO_RD, ®val);
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fifo_chan = FIELD_GET(MESON_SAR_ADC_FIFO_RD_CHAN_ID_MASK, regval);
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if (fifo_chan != channel) {
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printf("ADC FIFO entry belongs to channel %d instead of %d\n",
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fifo_chan, channel);
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return -EINVAL;
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}
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fifo_val = FIELD_GET(MESON_SAR_ADC_FIFO_RD_SAMPLE_VALUE_MASK, regval);
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fifo_val &= GENMASK(priv->data->num_bits - 1, 0);
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*val = meson_saradc_calib_val(priv, fifo_val);
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return 0;
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}
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static void meson_saradc_start_sample_engine(struct meson_saradc_priv *priv)
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{
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regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
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MESON_SAR_ADC_REG0_FIFO_IRQ_EN,
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MESON_SAR_ADC_REG0_FIFO_IRQ_EN);
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regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
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MESON_SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE,
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MESON_SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE);
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regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
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MESON_SAR_ADC_REG0_SAMPLING_START,
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MESON_SAR_ADC_REG0_SAMPLING_START);
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}
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static void meson_saradc_stop_sample_engine(struct meson_saradc_priv *priv)
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{
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
|
||||
MESON_SAR_ADC_REG0_FIFO_IRQ_EN, 0);
|
||||
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
|
||||
MESON_SAR_ADC_REG0_SAMPLING_STOP,
|
||||
MESON_SAR_ADC_REG0_SAMPLING_STOP);
|
||||
|
||||
/* wait until all modules are stopped */
|
||||
meson_saradc_wait_busy_clear(priv);
|
||||
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
|
||||
MESON_SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE, 0);
|
||||
}
|
||||
|
||||
enum meson_saradc_avg_mode {
|
||||
NO_AVERAGING = 0x0,
|
||||
MEAN_AVERAGING = 0x1,
|
||||
MEDIAN_AVERAGING = 0x2,
|
||||
};
|
||||
|
||||
enum meson_saradc_num_samples {
|
||||
ONE_SAMPLE = 0x0,
|
||||
TWO_SAMPLES = 0x1,
|
||||
FOUR_SAMPLES = 0x2,
|
||||
EIGHT_SAMPLES = 0x3,
|
||||
};
|
||||
|
||||
static void meson_saradc_set_averaging(struct meson_saradc_priv *priv,
|
||||
unsigned int channel,
|
||||
enum meson_saradc_avg_mode mode,
|
||||
enum meson_saradc_num_samples samples)
|
||||
{
|
||||
int val;
|
||||
|
||||
val = samples << MESON_SAR_ADC_AVG_CNTL_NUM_SAMPLES_SHIFT(channel);
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_AVG_CNTL,
|
||||
MESON_SAR_ADC_AVG_CNTL_NUM_SAMPLES_MASK(channel),
|
||||
val);
|
||||
|
||||
val = mode << MESON_SAR_ADC_AVG_CNTL_AVG_MODE_SHIFT(channel);
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_AVG_CNTL,
|
||||
MESON_SAR_ADC_AVG_CNTL_AVG_MODE_MASK(channel), val);
|
||||
}
|
||||
|
||||
static void meson_saradc_enable_channel(struct meson_saradc_priv *priv,
|
||||
unsigned int channel)
|
||||
{
|
||||
uint regval;
|
||||
|
||||
/*
|
||||
* the SAR ADC engine allows sampling multiple channels at the same
|
||||
* time. to keep it simple we're only working with one *internal*
|
||||
* channel, which starts counting at index 0 (which means: count = 1).
|
||||
*/
|
||||
regval = FIELD_PREP(MESON_SAR_ADC_CHAN_LIST_MAX_INDEX_MASK, 0);
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_LIST,
|
||||
MESON_SAR_ADC_CHAN_LIST_MAX_INDEX_MASK, regval);
|
||||
|
||||
/* map channel index 0 to the channel which we want to read */
|
||||
regval = FIELD_PREP(MESON_SAR_ADC_CHAN_LIST_ENTRY_MASK(0), channel);
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_LIST,
|
||||
MESON_SAR_ADC_CHAN_LIST_ENTRY_MASK(0), regval);
|
||||
|
||||
regval = FIELD_PREP(MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_MUX_MASK,
|
||||
channel);
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_DETECT_IDLE_SW,
|
||||
MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_MUX_MASK,
|
||||
regval);
|
||||
|
||||
regval = FIELD_PREP(MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_MUX_SEL_MASK,
|
||||
channel);
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_DETECT_IDLE_SW,
|
||||
MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_MUX_SEL_MASK,
|
||||
regval);
|
||||
|
||||
if (channel == 6)
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELTA_10,
|
||||
MESON_SAR_ADC_DELTA_10_TEMP_SEL, 0);
|
||||
}
|
||||
|
||||
static int meson_saradc_get_sample(struct meson_saradc_priv *priv,
|
||||
int chan, uint *val)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = meson_saradc_lock(priv);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* clear the FIFO to make sure we're not reading old values */
|
||||
meson_saradc_clear_fifo(priv);
|
||||
|
||||
meson_saradc_set_averaging(priv, chan, MEAN_AVERAGING, EIGHT_SAMPLES);
|
||||
|
||||
meson_saradc_enable_channel(priv, chan);
|
||||
|
||||
meson_saradc_start_sample_engine(priv);
|
||||
ret = meson_saradc_read_raw_sample(priv, chan, val);
|
||||
meson_saradc_stop_sample_engine(priv);
|
||||
|
||||
meson_saradc_unlock(priv);
|
||||
|
||||
if (ret) {
|
||||
printf("failed to read sample for channel %d: %d\n",
|
||||
chan, ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int meson_saradc_channel_data(struct udevice *dev, int channel,
|
||||
unsigned int *data)
|
||||
{
|
||||
struct meson_saradc_priv *priv = dev_get_priv(dev);
|
||||
|
||||
if (channel != priv->active_channel) {
|
||||
pr_err("Requested channel is not active!");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return meson_saradc_get_sample(priv, channel, data);
|
||||
}
|
||||
|
||||
enum meson_saradc_chan7_mux_sel {
|
||||
CHAN7_MUX_VSS = 0x0,
|
||||
CHAN7_MUX_VDD_DIV4 = 0x1,
|
||||
CHAN7_MUX_VDD_DIV2 = 0x2,
|
||||
CHAN7_MUX_VDD_MUL3_DIV4 = 0x3,
|
||||
CHAN7_MUX_VDD = 0x4,
|
||||
CHAN7_MUX_CH7_INPUT = 0x7,
|
||||
};
|
||||
|
||||
static void meson_saradc_set_chan7_mux(struct meson_saradc_priv *priv,
|
||||
enum meson_saradc_chan7_mux_sel sel)
|
||||
{
|
||||
u32 regval;
|
||||
|
||||
regval = FIELD_PREP(MESON_SAR_ADC_REG3_CTRL_CHAN7_MUX_SEL_MASK, sel);
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3,
|
||||
MESON_SAR_ADC_REG3_CTRL_CHAN7_MUX_SEL_MASK, regval);
|
||||
|
||||
udelay(20);
|
||||
}
|
||||
|
||||
static int meson_saradc_calib(struct meson_saradc_priv *priv)
|
||||
{
|
||||
uint nominal0, nominal1, value0, value1;
|
||||
int ret;
|
||||
|
||||
/* use points 25% and 75% for calibration */
|
||||
nominal0 = (1 << priv->data->num_bits) / 4;
|
||||
nominal1 = (1 << priv->data->num_bits) * 3 / 4;
|
||||
|
||||
meson_saradc_set_chan7_mux(priv, CHAN7_MUX_VDD_DIV4);
|
||||
udelay(20);
|
||||
ret = meson_saradc_get_sample(priv, 7, &value0);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
|
||||
meson_saradc_set_chan7_mux(priv, CHAN7_MUX_VDD_MUL3_DIV4);
|
||||
udelay(20);
|
||||
ret = meson_saradc_get_sample(priv, 7, &value1);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
|
||||
if (value1 <= value0) {
|
||||
ret = -EINVAL;
|
||||
goto out;
|
||||
}
|
||||
|
||||
priv->calibscale = div_s64((nominal1 - nominal0) * (s64)MILLION,
|
||||
value1 - value0);
|
||||
priv->calibbias = nominal0 - div_s64((s64)value0 * priv->calibscale,
|
||||
MILLION);
|
||||
ret = 0;
|
||||
out:
|
||||
meson_saradc_set_chan7_mux(priv, CHAN7_MUX_CH7_INPUT);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int meson_saradc_init(struct meson_saradc_priv *priv)
|
||||
{
|
||||
uint regval;
|
||||
int ret, i;
|
||||
|
||||
priv->calibscale = MILLION;
|
||||
|
||||
/*
|
||||
* make sure we start at CH7 input since the other muxes are only used
|
||||
* for internal calibration.
|
||||
*/
|
||||
meson_saradc_set_chan7_mux(priv, CHAN7_MUX_CH7_INPUT);
|
||||
|
||||
/*
|
||||
* leave sampling delay and the input clocks as configured by
|
||||
* BL30 to make sure BL30 gets the values it expects when
|
||||
* reading the temperature sensor.
|
||||
*/
|
||||
regmap_read(priv->regmap, MESON_SAR_ADC_REG3, ®val);
|
||||
if (regval & MESON_SAR_ADC_REG3_BL30_INITIALIZED)
|
||||
return 0;
|
||||
|
||||
meson_saradc_stop_sample_engine(priv);
|
||||
|
||||
/* update the channel 6 MUX to select the temperature sensor */
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
|
||||
MESON_SAR_ADC_REG0_ADC_TEMP_SEN_SEL,
|
||||
MESON_SAR_ADC_REG0_ADC_TEMP_SEN_SEL);
|
||||
|
||||
/* disable all channels by default */
|
||||
regmap_write(priv->regmap, MESON_SAR_ADC_CHAN_LIST, 0x0);
|
||||
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3,
|
||||
MESON_SAR_ADC_REG3_CTRL_SAMPLING_CLOCK_PHASE, 0);
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3,
|
||||
MESON_SAR_ADC_REG3_CNTL_USE_SC_DLY,
|
||||
MESON_SAR_ADC_REG3_CNTL_USE_SC_DLY);
|
||||
|
||||
/* delay between two samples = (10+1) * 1uS */
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY,
|
||||
MESON_SAR_ADC_DELAY_INPUT_DLY_CNT_MASK,
|
||||
FIELD_PREP(MESON_SAR_ADC_DELAY_SAMPLE_DLY_CNT_MASK,
|
||||
10));
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY,
|
||||
MESON_SAR_ADC_DELAY_SAMPLE_DLY_SEL_MASK,
|
||||
FIELD_PREP(MESON_SAR_ADC_DELAY_SAMPLE_DLY_SEL_MASK,
|
||||
0));
|
||||
|
||||
/* delay between two samples = (10+1) * 1uS */
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY,
|
||||
MESON_SAR_ADC_DELAY_INPUT_DLY_CNT_MASK,
|
||||
FIELD_PREP(MESON_SAR_ADC_DELAY_INPUT_DLY_CNT_MASK,
|
||||
10));
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY,
|
||||
MESON_SAR_ADC_DELAY_INPUT_DLY_SEL_MASK,
|
||||
FIELD_PREP(MESON_SAR_ADC_DELAY_INPUT_DLY_SEL_MASK,
|
||||
1));
|
||||
|
||||
/*
|
||||
* set up the input channel muxes in MESON_SAR_ADC_CHAN_10_SW
|
||||
* (0 = SAR_ADC_CH0, 1 = SAR_ADC_CH1)
|
||||
*/
|
||||
regval = FIELD_PREP(MESON_SAR_ADC_CHAN_10_SW_CHAN0_MUX_SEL_MASK, 0);
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_10_SW,
|
||||
MESON_SAR_ADC_CHAN_10_SW_CHAN0_MUX_SEL_MASK,
|
||||
regval);
|
||||
regval = FIELD_PREP(MESON_SAR_ADC_CHAN_10_SW_CHAN1_MUX_SEL_MASK, 1);
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_10_SW,
|
||||
MESON_SAR_ADC_CHAN_10_SW_CHAN1_MUX_SEL_MASK,
|
||||
regval);
|
||||
|
||||
/*
|
||||
* set up the input channel muxes in MESON_SAR_ADC_AUX_SW
|
||||
* (2 = SAR_ADC_CH2, 3 = SAR_ADC_CH3, ...) and enable
|
||||
* MESON_SAR_ADC_AUX_SW_YP_DRIVE_SW and
|
||||
* MESON_SAR_ADC_AUX_SW_XP_DRIVE_SW like the vendor driver.
|
||||
*/
|
||||
regval = 0;
|
||||
for (i = 2; i <= 7; i++)
|
||||
regval |= i << MESON_SAR_ADC_AUX_SW_MUX_SEL_CHAN_SHIFT(i);
|
||||
regval |= MESON_SAR_ADC_AUX_SW_YP_DRIVE_SW;
|
||||
regval |= MESON_SAR_ADC_AUX_SW_XP_DRIVE_SW;
|
||||
regmap_write(priv->regmap, MESON_SAR_ADC_AUX_SW, regval);
|
||||
|
||||
ret = meson_saradc_lock(priv);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
#if CONFIG_IS_ENABLED(CLK)
|
||||
ret = clk_enable(&priv->core_clk);
|
||||
if (ret)
|
||||
return ret;
|
||||
#endif
|
||||
|
||||
regval = FIELD_PREP(MESON_SAR_ADC_REG0_FIFO_CNT_IRQ_MASK, 1);
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
|
||||
MESON_SAR_ADC_REG0_FIFO_CNT_IRQ_MASK, regval);
|
||||
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG11,
|
||||
MESON_SAR_ADC_REG11_BANDGAP_EN,
|
||||
MESON_SAR_ADC_REG11_BANDGAP_EN);
|
||||
|
||||
regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3,
|
||||
MESON_SAR_ADC_REG3_ADC_EN,
|
||||
MESON_SAR_ADC_REG3_ADC_EN);
|
||||
|
||||
udelay(5);
|
||||
|
||||
#if CONFIG_IS_ENABLED(CLK)
|
||||
ret = clk_enable(&priv->adc_clk);
|
||||
if (ret)
|
||||
return ret;
|
||||
#endif
|
||||
|
||||
meson_saradc_unlock(priv);
|
||||
|
||||
ret = meson_saradc_calib(priv);
|
||||
if (ret) {
|
||||
printf("calibration failed\n");
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int meson_saradc_start_channel(struct udevice *dev, int channel)
|
||||
{
|
||||
struct meson_saradc_priv *priv = dev_get_priv(dev);
|
||||
|
||||
if (channel < 0 || channel >= NUM_CHANNELS) {
|
||||
printf("Requested channel is invalid!");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (!priv->initialized) {
|
||||
int ret;
|
||||
|
||||
ret = meson_saradc_init(priv);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
priv->initialized = true;
|
||||
}
|
||||
|
||||
priv->active_channel = channel;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int meson_saradc_stop(struct udevice *dev)
|
||||
{
|
||||
struct meson_saradc_priv *priv = dev_get_priv(dev);
|
||||
|
||||
priv->active_channel = -1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int meson_saradc_probe(struct udevice *dev)
|
||||
{
|
||||
struct meson_saradc_priv *priv = dev_get_priv(dev);
|
||||
int ret;
|
||||
|
||||
ret = regmap_init_mem(dev, &priv->regmap);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
#if CONFIG_IS_ENABLED(CLK)
|
||||
ret = clk_get_by_name(dev, "core", &priv->core_clk);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = clk_get_by_name(dev, "adc_clk", &priv->adc_clk);
|
||||
if (ret)
|
||||
return ret;
|
||||
#endif
|
||||
|
||||
priv->active_channel = -1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int meson_saradc_ofdata_to_platdata(struct udevice *dev)
|
||||
{
|
||||
struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
|
||||
struct meson_saradc_priv *priv = dev_get_priv(dev);
|
||||
|
||||
priv->data = (struct meson_saradc_data *)dev_get_driver_data(dev);
|
||||
|
||||
uc_pdata->data_mask = GENMASK(priv->data->num_bits - 1, 0);
|
||||
uc_pdata->data_format = ADC_DATA_FORMAT_BIN;
|
||||
uc_pdata->data_timeout_us = MESON_SAR_ADC_TIMEOUT * 1000;
|
||||
uc_pdata->channel_mask = GENMASK(NUM_CHANNELS - 1, 0);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct adc_ops meson_saradc_ops = {
|
||||
.start_channel = meson_saradc_start_channel,
|
||||
.channel_data = meson_saradc_channel_data,
|
||||
.stop = meson_saradc_stop,
|
||||
};
|
||||
|
||||
static const struct meson_saradc_data gxbb_saradc_data = {
|
||||
.num_bits = 10,
|
||||
};
|
||||
|
||||
static const struct meson_saradc_data gxl_saradc_data = {
|
||||
.num_bits = 12,
|
||||
};
|
||||
|
||||
static const struct udevice_id meson_saradc_ids[] = {
|
||||
{ .compatible = "amlogic,meson-gxbb-saradc",
|
||||
.data = (ulong)&gxbb_saradc_data },
|
||||
{ .compatible = "amlogic,meson-gxl-saradc",
|
||||
.data = (ulong)&gxl_saradc_data },
|
||||
{ .compatible = "amlogic,meson-gxm-saradc",
|
||||
.data = (ulong)&gxl_saradc_data },
|
||||
{ }
|
||||
};
|
||||
|
||||
U_BOOT_DRIVER(meson_saradc) = {
|
||||
.name = "meson_saradc",
|
||||
.id = UCLASS_ADC,
|
||||
.of_match = meson_saradc_ids,
|
||||
.ops = &meson_saradc_ops,
|
||||
.probe = meson_saradc_probe,
|
||||
.ofdata_to_platdata = meson_saradc_ofdata_to_platdata,
|
||||
.priv_auto_alloc_size = sizeof(struct meson_saradc_priv),
|
||||
};
|
||||
Loading…
Reference in New Issue
Block a user