mfd: mxs-lradc: Add support for mxs-lradc
Add core files for low resolution analog-to-digital converter (mxs-lradc) MFD driver. Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com> Reviewed-by: Marek Vasut <marex@denx.de> Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Ksenija Stanojevic
Lee Jones
parent
c1ae3cfa0e
commit
ead25133e9
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@ -344,6 +344,23 @@ config MFD_MC13XXX_I2C
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help
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Select this if your MC13xxx is connected via an I2C bus.
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config MFD_MXS_LRADC
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tristate "Freescale i.MX23/i.MX28 LRADC"
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depends on ARCH_MXS || COMPILE_TEST
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select MFD_CORE
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select STMP_DEVICE
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help
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Say yes here to build support for the Low Resolution
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Analog-to-Digital Converter (LRADC) found on the i.MX23 and i.MX28
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processors. This driver provides common support for accessing the
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device, additional drivers must be enabled in order to use the
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functionality of the device:
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mxs-lradc-adc for ADC readings
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mxs-lradc-ts for touchscreen support
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This driver can also be built as a module. If so, the module will be
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called mxs-lradc.
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config MFD_MX25_TSADC
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tristate "Freescale i.MX25 integrated Touchscreen and ADC unit"
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select REGMAP_MMIO
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@ -215,3 +215,4 @@ obj-$(CONFIG_MFD_ALTERA_A10SR) += altera-a10sr.o
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obj-$(CONFIG_MFD_SUN4I_GPADC) += sun4i-gpadc.o
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obj-$(CONFIG_MFD_STM32_TIMERS) += stm32-timers.o
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obj-$(CONFIG_MFD_MXS_LRADC) += mxs-lradc.o
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@ -0,0 +1,267 @@
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/*
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* Freescale MXS Low Resolution Analog-to-Digital Converter driver
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*
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* Copyright (c) 2012 DENX Software Engineering, GmbH.
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* Copyright (c) 2017 Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
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*
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* Authors:
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* Marek Vasut <marex@denx.de>
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* Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/clk.h>
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#include <linux/device.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/mxs-lradc.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#define ADC_CELL 0
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#define TSC_CELL 1
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#define RES_MEM 0
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enum mx23_lradc_irqs {
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MX23_LRADC_TS_IRQ = 0,
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MX23_LRADC_CH0_IRQ,
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MX23_LRADC_CH1_IRQ,
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MX23_LRADC_CH2_IRQ,
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MX23_LRADC_CH3_IRQ,
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MX23_LRADC_CH4_IRQ,
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MX23_LRADC_CH5_IRQ,
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MX23_LRADC_CH6_IRQ,
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MX23_LRADC_CH7_IRQ,
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};
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enum mx28_lradc_irqs {
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MX28_LRADC_TS_IRQ = 0,
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MX28_LRADC_TRESH0_IRQ,
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MX28_LRADC_TRESH1_IRQ,
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MX28_LRADC_CH0_IRQ,
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MX28_LRADC_CH1_IRQ,
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MX28_LRADC_CH2_IRQ,
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MX28_LRADC_CH3_IRQ,
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MX28_LRADC_CH4_IRQ,
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MX28_LRADC_CH5_IRQ,
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MX28_LRADC_CH6_IRQ,
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MX28_LRADC_CH7_IRQ,
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MX28_LRADC_BUTTON0_IRQ,
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MX28_LRADC_BUTTON1_IRQ,
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};
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static struct resource mx23_adc_resources[] = {
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DEFINE_RES_MEM(0x0, 0x0),
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DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH0_IRQ, "mxs-lradc-channel0"),
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DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH1_IRQ, "mxs-lradc-channel1"),
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DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH2_IRQ, "mxs-lradc-channel2"),
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DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH3_IRQ, "mxs-lradc-channel3"),
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DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH4_IRQ, "mxs-lradc-channel4"),
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DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH5_IRQ, "mxs-lradc-channel5"),
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};
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static struct resource mx23_touchscreen_resources[] = {
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DEFINE_RES_MEM(0x0, 0x0),
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DEFINE_RES_IRQ_NAMED(MX23_LRADC_TS_IRQ, "mxs-lradc-touchscreen"),
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DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH6_IRQ, "mxs-lradc-channel6"),
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DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH7_IRQ, "mxs-lradc-channel7"),
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};
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static struct resource mx28_adc_resources[] = {
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DEFINE_RES_MEM(0x0, 0x0),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH0_IRQ, "mxs-lradc-thresh0"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH1_IRQ, "mxs-lradc-thresh1"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH0_IRQ, "mxs-lradc-channel0"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH1_IRQ, "mxs-lradc-channel1"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH2_IRQ, "mxs-lradc-channel2"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH3_IRQ, "mxs-lradc-channel3"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH4_IRQ, "mxs-lradc-channel4"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH5_IRQ, "mxs-lradc-channel5"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON0_IRQ, "mxs-lradc-button0"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON1_IRQ, "mxs-lradc-button1"),
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};
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static struct resource mx28_touchscreen_resources[] = {
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DEFINE_RES_MEM(0x0, 0x0),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_TS_IRQ, "mxs-lradc-touchscreen"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH6_IRQ, "mxs-lradc-channel6"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH7_IRQ, "mxs-lradc-channel7"),
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};
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static struct mfd_cell mx23_cells[] = {
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{
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.name = "mxs-lradc-adc",
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.resources = mx23_adc_resources,
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.num_resources = ARRAY_SIZE(mx23_adc_resources),
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},
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{
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.name = "mxs-lradc-ts",
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.resources = mx23_touchscreen_resources,
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.num_resources = ARRAY_SIZE(mx23_touchscreen_resources),
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},
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};
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static struct mfd_cell mx28_cells[] = {
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{
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.name = "mxs-lradc-adc",
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.resources = mx28_adc_resources,
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.num_resources = ARRAY_SIZE(mx28_adc_resources),
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},
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{
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.name = "mxs-lradc-ts",
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.resources = mx28_touchscreen_resources,
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.num_resources = ARRAY_SIZE(mx28_touchscreen_resources),
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}
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};
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static const struct of_device_id mxs_lradc_dt_ids[] = {
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{ .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, },
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{ .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids);
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static int mxs_lradc_probe(struct platform_device *pdev)
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{
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const struct of_device_id *of_id;
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struct device *dev = &pdev->dev;
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struct device_node *node = dev->of_node;
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struct mxs_lradc *lradc;
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struct mfd_cell *cells = NULL;
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struct resource *res;
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int ret = 0;
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u32 ts_wires = 0;
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lradc = devm_kzalloc(&pdev->dev, sizeof(*lradc), GFP_KERNEL);
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if (!lradc)
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return -ENOMEM;
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of_id = of_match_device(mxs_lradc_dt_ids, &pdev->dev);
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if (!of_id)
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return -EINVAL;
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lradc->soc = (enum mxs_lradc_id)of_id->data;
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lradc->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(lradc->clk)) {
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dev_err(dev, "Failed to get the delay unit clock\n");
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return PTR_ERR(lradc->clk);
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}
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ret = clk_prepare_enable(lradc->clk);
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if (ret) {
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dev_err(dev, "Failed to enable the delay unit clock\n");
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return ret;
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}
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ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires",
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&ts_wires);
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if (!ret) {
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lradc->buffer_vchans = BUFFER_VCHANS_LIMITED;
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switch (ts_wires) {
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case 4:
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lradc->touchscreen_wire = MXS_LRADC_TOUCHSCREEN_4WIRE;
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break;
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case 5:
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if (lradc->soc == IMX28_LRADC) {
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lradc->touchscreen_wire =
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MXS_LRADC_TOUCHSCREEN_5WIRE;
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break;
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}
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/* fall through to an error message for i.MX23 */
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default:
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dev_err(&pdev->dev,
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"Unsupported number of touchscreen wires (%d)\n"
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, ts_wires);
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ret = -EINVAL;
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goto err_clk;
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}
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} else {
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lradc->buffer_vchans = BUFFER_VCHANS_ALL;
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}
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platform_set_drvdata(pdev, lradc);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENOMEM;
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switch (lradc->soc) {
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case IMX23_LRADC:
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mx23_adc_resources[RES_MEM] = *res;
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mx23_touchscreen_resources[RES_MEM] = *res;
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cells = mx23_cells;
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break;
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case IMX28_LRADC:
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mx28_adc_resources[RES_MEM] = *res;
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mx28_touchscreen_resources[RES_MEM] = *res;
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cells = mx28_cells;
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break;
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default:
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dev_err(dev, "Unsupported SoC\n");
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ret = -ENODEV;
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goto err_clk;
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}
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ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
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&cells[ADC_CELL], 1, NULL, 0, NULL);
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if (ret) {
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dev_err(&pdev->dev, "Failed to add the ADC subdevice\n");
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goto err_clk;
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}
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if (!lradc->touchscreen_wire)
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return 0;
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ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
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&cells[TSC_CELL], 1, NULL, 0, NULL);
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if (ret) {
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dev_err(&pdev->dev,
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"Failed to add the touchscreen subdevice\n");
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goto err_clk;
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}
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return 0;
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err_clk:
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clk_disable_unprepare(lradc->clk);
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return ret;
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}
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static int mxs_lradc_remove(struct platform_device *pdev)
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{
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struct mxs_lradc *lradc = platform_get_drvdata(pdev);
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clk_disable_unprepare(lradc->clk);
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return 0;
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}
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static struct platform_driver mxs_lradc_driver = {
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.driver = {
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.name = "mxs-lradc",
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.of_match_table = mxs_lradc_dt_ids,
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},
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.probe = mxs_lradc_probe,
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.remove = mxs_lradc_remove,
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};
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module_platform_driver(mxs_lradc_driver);
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MODULE_AUTHOR("Ksenija Stanojevic <ksenija.stanojevic@gmail.com>");
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MODULE_DESCRIPTION("Freescale i.MX23/i.MX28 LRADC driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:mxs-lradc");
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@ -0,0 +1,187 @@
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/*
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* Freescale MXS Low Resolution Analog-to-Digital Converter driver
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*
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* Copyright (c) 2012 DENX Software Engineering, GmbH.
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* Copyright (c) 2016 Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
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*
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* Author: Marek Vasut <marex@denx.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __MFD_MXS_LRADC_H
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#define __MFD_MXS_LRADC_H
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#include <linux/bitops.h>
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#include <linux/io.h>
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#include <linux/stmp_device.h>
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#define LRADC_MAX_DELAY_CHANS 4
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#define LRADC_MAX_MAPPED_CHANS 8
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#define LRADC_MAX_TOTAL_CHANS 16
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#define LRADC_DELAY_TIMER_HZ 2000
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#define LRADC_CTRL0 0x00
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# define LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE BIT(23)
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# define LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE BIT(22)
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# define LRADC_CTRL0_MX28_YNNSW /* YM */ BIT(21)
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# define LRADC_CTRL0_MX28_YPNSW /* YP */ BIT(20)
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# define LRADC_CTRL0_MX28_YPPSW /* YP */ BIT(19)
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# define LRADC_CTRL0_MX28_XNNSW /* XM */ BIT(18)
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# define LRADC_CTRL0_MX28_XNPSW /* XM */ BIT(17)
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# define LRADC_CTRL0_MX28_XPPSW /* XP */ BIT(16)
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# define LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE BIT(20)
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# define LRADC_CTRL0_MX23_YM BIT(19)
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# define LRADC_CTRL0_MX23_XM BIT(18)
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# define LRADC_CTRL0_MX23_YP BIT(17)
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# define LRADC_CTRL0_MX23_XP BIT(16)
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# define LRADC_CTRL0_MX28_PLATE_MASK \
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(LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE | \
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LRADC_CTRL0_MX28_YNNSW | LRADC_CTRL0_MX28_YPNSW | \
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LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW | \
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LRADC_CTRL0_MX28_XNPSW | LRADC_CTRL0_MX28_XPPSW)
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# define LRADC_CTRL0_MX23_PLATE_MASK \
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(LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE | \
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LRADC_CTRL0_MX23_YM | LRADC_CTRL0_MX23_XM | \
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LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XP)
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#define LRADC_CTRL1 0x10
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#define LRADC_CTRL1_TOUCH_DETECT_IRQ_EN BIT(24)
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#define LRADC_CTRL1_LRADC_IRQ_EN(n) (1 << ((n) + 16))
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#define LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK (0x1fff << 16)
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#define LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK (0x01ff << 16)
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#define LRADC_CTRL1_LRADC_IRQ_EN_OFFSET 16
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#define LRADC_CTRL1_TOUCH_DETECT_IRQ BIT(8)
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#define LRADC_CTRL1_LRADC_IRQ(n) BIT(n)
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#define LRADC_CTRL1_MX28_LRADC_IRQ_MASK 0x1fff
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#define LRADC_CTRL1_MX23_LRADC_IRQ_MASK 0x01ff
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#define LRADC_CTRL1_LRADC_IRQ_OFFSET 0
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#define LRADC_CTRL2 0x20
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#define LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET 24
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#define LRADC_CTRL2_TEMPSENSE_PWD BIT(15)
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#define LRADC_STATUS 0x40
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#define LRADC_STATUS_TOUCH_DETECT_RAW BIT(0)
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#define LRADC_CH(n) (0x50 + (0x10 * (n)))
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#define LRADC_CH_ACCUMULATE BIT(29)
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#define LRADC_CH_NUM_SAMPLES_MASK (0x1f << 24)
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#define LRADC_CH_NUM_SAMPLES_OFFSET 24
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#define LRADC_CH_NUM_SAMPLES(x) \
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((x) << LRADC_CH_NUM_SAMPLES_OFFSET)
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#define LRADC_CH_VALUE_MASK 0x3ffff
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#define LRADC_CH_VALUE_OFFSET 0
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#define LRADC_DELAY(n) (0xd0 + (0x10 * (n)))
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#define LRADC_DELAY_TRIGGER_LRADCS_MASK (0xffUL << 24)
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#define LRADC_DELAY_TRIGGER_LRADCS_OFFSET 24
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#define LRADC_DELAY_TRIGGER(x) \
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(((x) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) & \
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LRADC_DELAY_TRIGGER_LRADCS_MASK)
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#define LRADC_DELAY_KICK BIT(20)
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#define LRADC_DELAY_TRIGGER_DELAYS_MASK (0xf << 16)
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#define LRADC_DELAY_TRIGGER_DELAYS_OFFSET 16
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||||
#define LRADC_DELAY_TRIGGER_DELAYS(x) \
|
||||
(((x) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) & \
|
||||
LRADC_DELAY_TRIGGER_DELAYS_MASK)
|
||||
#define LRADC_DELAY_LOOP_COUNT_MASK (0x1f << 11)
|
||||
#define LRADC_DELAY_LOOP_COUNT_OFFSET 11
|
||||
#define LRADC_DELAY_LOOP(x) \
|
||||
(((x) << LRADC_DELAY_LOOP_COUNT_OFFSET) & \
|
||||
LRADC_DELAY_LOOP_COUNT_MASK)
|
||||
#define LRADC_DELAY_DELAY_MASK 0x7ff
|
||||
#define LRADC_DELAY_DELAY_OFFSET 0
|
||||
#define LRADC_DELAY_DELAY(x) \
|
||||
(((x) << LRADC_DELAY_DELAY_OFFSET) & \
|
||||
LRADC_DELAY_DELAY_MASK)
|
||||
|
||||
#define LRADC_CTRL4 0x140
|
||||
#define LRADC_CTRL4_LRADCSELECT_MASK(n) (0xf << ((n) * 4))
|
||||
#define LRADC_CTRL4_LRADCSELECT_OFFSET(n) ((n) * 4)
|
||||
#define LRADC_CTRL4_LRADCSELECT(n, x) \
|
||||
(((x) << LRADC_CTRL4_LRADCSELECT_OFFSET(n)) & \
|
||||
LRADC_CTRL4_LRADCSELECT_MASK(n))
|
||||
|
||||
#define LRADC_RESOLUTION 12
|
||||
#define LRADC_SINGLE_SAMPLE_MASK ((1 << LRADC_RESOLUTION) - 1)
|
||||
|
||||
#define BUFFER_VCHANS_LIMITED 0x3f
|
||||
#define BUFFER_VCHANS_ALL 0xff
|
||||
|
||||
/*
|
||||
* Certain LRADC channels are shared between touchscreen
|
||||
* and/or touch-buttons and generic LRADC block. Therefore when using
|
||||
* either of these, these channels are not available for the regular
|
||||
* sampling. The shared channels are as follows:
|
||||
*
|
||||
* CH0 -- Touch button #0
|
||||
* CH1 -- Touch button #1
|
||||
* CH2 -- Touch screen XPUL
|
||||
* CH3 -- Touch screen YPLL
|
||||
* CH4 -- Touch screen XNUL
|
||||
* CH5 -- Touch screen YNLR
|
||||
* CH6 -- Touch screen WIPER (5-wire only)
|
||||
*
|
||||
* The bit fields below represents which parts of the LRADC block are
|
||||
* switched into special mode of operation. These channels can not
|
||||
* be sampled as regular LRADC channels. The driver will refuse any
|
||||
* attempt to sample these channels.
|
||||
*/
|
||||
#define CHAN_MASK_TOUCHBUTTON (BIT(1) | BIT(0))
|
||||
#define CHAN_MASK_TOUCHSCREEN_4WIRE (0xf << 2)
|
||||
#define CHAN_MASK_TOUCHSCREEN_5WIRE (0x1f << 2)
|
||||
|
||||
enum mxs_lradc_id {
|
||||
IMX23_LRADC,
|
||||
IMX28_LRADC,
|
||||
};
|
||||
|
||||
enum mxs_lradc_ts_wires {
|
||||
MXS_LRADC_TOUCHSCREEN_NONE = 0,
|
||||
MXS_LRADC_TOUCHSCREEN_4WIRE,
|
||||
MXS_LRADC_TOUCHSCREEN_5WIRE,
|
||||
};
|
||||
|
||||
/**
|
||||
* struct mxs_lradc
|
||||
* @soc: soc type (IMX23 or IMX28)
|
||||
* @clk: 2 kHz clock for delay units
|
||||
* @buffer_vchans: channels that can be used during buffered capture
|
||||
* @touchscreen_wire: touchscreen type (4-wire or 5-wire)
|
||||
* @use_touchbutton: button state (on or off)
|
||||
*/
|
||||
struct mxs_lradc {
|
||||
enum mxs_lradc_id soc;
|
||||
struct clk *clk;
|
||||
u8 buffer_vchans;
|
||||
|
||||
enum mxs_lradc_ts_wires touchscreen_wire;
|
||||
bool use_touchbutton;
|
||||
};
|
||||
|
||||
static inline u32 mxs_lradc_irq_mask(struct mxs_lradc *lradc)
|
||||
{
|
||||
switch (lradc->soc) {
|
||||
case IMX23_LRADC:
|
||||
return LRADC_CTRL1_MX23_LRADC_IRQ_MASK;
|
||||
case IMX28_LRADC:
|
||||
return LRADC_CTRL1_MX28_LRADC_IRQ_MASK;
|
||||
default:
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
#endif /* __MXS_LRADC_H */
|
||||
Loading…
Reference in New Issue