[v9,1/5] mfd: mxs-lradc: Add support for mxs-lradc MFD

Message ID	c18883dfacaaf40ab98cbb4938d5164a95a817d7.1478071676.git.ksenija.stanojevic@gmail.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <linux-input-owner@kernel.org> From: Ksenija Stanojevic <ksenija.stanojevic@gmail.com> To: linux-kernel@vger.kernel.org Cc: lee.jones@linaro.org, dmitry.torokhov@gmail.com, linux-input@vger.kernel.org, jic23@kernel.org, knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, marex@denx.de, linux-iio@vger.kernel.org, harald@ccbib.org, stefan.wahren@i2se.com, fabio.estevam@freescale.com, Ksenija Stanojevic <ksenija.stanojevic@gmail.com> Subject: [PATCH v9 1/5] mfd: mxs-lradc: Add support for mxs-lradc MFD Date: Wed, 2 Nov 2016 08:38:22 +0100 Message-Id: <c18883dfacaaf40ab98cbb4938d5164a95a817d7.1478071676.git.ksenija.stanojevic@gmail.com> In-Reply-To: <cover.1478071676.git.ksenija.stanojevic@gmail.com> References: <cover.1478071676.git.ksenija.stanojevic@gmail.com> In-Reply-To: <cover.1478071676.git.ksenija.stanojevic@gmail.com> References: <cover.1478071676.git.ksenija.stanojevic@gmail.com> Sender: linux-input-owner@vger.kernel.org Precedence: bulk

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index c6df644..bdd88cf 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -326,6 +326,23 @@ config MFD_MC13XXX_I2C help Select this if your MC13xxx is connected via an I2C bus. +config MFD_MXS_LRADC + tristate "Freescale i.MX23/i.MX28 LRADC" + depends on ARCH_MXS || COMPILE_TEST + select MFD_CORE + select STMP_DEVICE + help + Say yes here to build support for the Low Resolution + Analog-to-Digital Converter (LRADC) found on the i.MX23 and i.MX28 + processors. This driver provides common support for accessing the + device, additional drivers must be enabled in order to use the + functionality of the device: + mxs-lradc-adc for ADC readings + mxs-lradc-ts for touchscreen support + + This driver can also be built as a module. If so, the module will be + called mxs-lradc. + config MFD_MX25_TSADC tristate "Freescale i.MX25 integrated Touchscreen and ADC unit" select REGMAP_MMIO diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 9834e66..057ca15 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -211,3 +211,4 @@ obj-$(CONFIG_INTEL_SOC_PMIC) += intel-soc-pmic.o obj-$(CONFIG_MFD_MT6397) += mt6397-core.o obj-$(CONFIG_MFD_ALTERA_A10SR) += altera-a10sr.o +obj-$(CONFIG_MFD_MXS_LRADC) += mxs-lradc.o diff --git a/drivers/mfd/mxs-lradc.c b/drivers/mfd/mxs-lradc.c new file mode 100644 index 0000000..ffc8f2e --- /dev/null +++ b/drivers/mfd/mxs-lradc.c @@ -0,0 +1,249 @@ +/* + * Freescale MXS Low Resolution Analog-to-Digital Converter driver + * + * Copyright (c) 2012 DENX Software Engineering, GmbH. + * Copyright (c) 2016 Ksenija Stanojevic <ksenija.stanojevic@gmail.com> + * + * Authors: + * Marek Vasut <marex@denx.de> + * Ksenija Stanojevic <ksenija.stanojevic@gmail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/clk.h> +#include <linux/device.h> +#include <linux/mfd/core.h> +#include <linux/mfd/mxs-lradc.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#define MXS_LRADC_BASE 0x80050000 +#define ADC_CELL 0 +#define TSC_CELL 1 + +enum mx23_lradc_irqs { + MX23_LRADC_TS_IRQ = 0, + MX23_LRADC_CH0_IRQ, + MX23_LRADC_CH1_IRQ, + MX23_LRADC_CH2_IRQ, + MX23_LRADC_CH3_IRQ, + MX23_LRADC_CH4_IRQ, + MX23_LRADC_CH5_IRQ, + MX23_LRADC_CH6_IRQ, + MX23_LRADC_CH7_IRQ, +}; + +enum mx28_lradc_irqs { + MX28_LRADC_TS_IRQ = 0, + MX28_LRADC_TRESH0_IRQ, + MX28_LRADC_TRESH1_IRQ, + MX28_LRADC_CH0_IRQ, + MX28_LRADC_CH1_IRQ, + MX28_LRADC_CH2_IRQ, + MX28_LRADC_CH3_IRQ, + MX28_LRADC_CH4_IRQ, + MX28_LRADC_CH5_IRQ, + MX28_LRADC_CH6_IRQ, + MX28_LRADC_CH7_IRQ, + MX28_LRADC_BUTTON0_IRQ, + MX28_LRADC_BUTTON1_IRQ, +}; + +static struct resource mx23_adc_resources[] = { + DEFINE_RES_MEM(MXS_LRADC_BASE, 0x1fff), + DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH0_IRQ, "mxs-lradc-channel0"), + DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH1_IRQ, "mxs-lradc-channel1"), + DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH2_IRQ, "mxs-lradc-channel2"), + DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH3_IRQ, "mxs-lradc-channel3"), + DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH4_IRQ, "mxs-lradc-channel4"), + DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH5_IRQ, "mxs-lradc-channel5"), +}; + +static struct resource mx23_touchscreen_resources[] = { + DEFINE_RES_MEM(MXS_LRADC_BASE, 0x1fff), + DEFINE_RES_IRQ_NAMED(MX23_LRADC_TS_IRQ, "mxs-lradc-touchscreen"), + DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH6_IRQ, "mxs-lradc-channel6"), + DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH7_IRQ, "mxs-lradc-channel7"), +}; + +static struct resource mx28_adc_resources[] = { + DEFINE_RES_MEM(MXS_LRADC_BASE, 0x1fff), + DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH0_IRQ, "mxs-lradc-thresh0"), + DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH1_IRQ, "mxs-lradc-thresh1"), + DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH0_IRQ, "mxs-lradc-channel0"), + DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH1_IRQ, "mxs-lradc-channel1"), + DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH2_IRQ, "mxs-lradc-channel2"), + DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH3_IRQ, "mxs-lradc-channel3"), + DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH4_IRQ, "mxs-lradc-channel4"), + DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH5_IRQ, "mxs-lradc-channel5"), + DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON0_IRQ, "mxs-lradc-button0"), + DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON1_IRQ, "mxs-lradc-button1"), +}; + +static struct resource mx28_touchscreen_resources[] = { + DEFINE_RES_MEM(MXS_LRADC_BASE, 0x1fff), + DEFINE_RES_IRQ_NAMED(MX28_LRADC_TS_IRQ, "mxs-lradc-touchscreen"), + DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH6_IRQ, "mxs-lradc-channel6"), + DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH7_IRQ, "mxs-lradc-channel7"), +}; + +static struct mfd_cell mxs_cells[] = { + { + .name = "mxs-lradc-adc", + }, + { + .name = "mxs-lradc-ts", + }, +}; + +static const struct of_device_id mxs_lradc_dt_ids[] = { + { .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, }, + { .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids); + +static int mxs_lradc_probe(struct platform_device *pdev) +{ + const struct of_device_id *of_id; + struct device *dev = &pdev->dev; + struct device_node *node = dev->of_node; + struct mxs_lradc *lradc; + struct mfd_cell *cells = mxs_cells; + int ret = 0; + u32 ts_wires = 0; + + lradc = devm_kzalloc(&pdev->dev, sizeof(*lradc), GFP_KERNEL); + if (!lradc) + return -ENOMEM; + + of_id = of_match_device(mxs_lradc_dt_ids, &pdev->dev); + lradc->soc = (enum mxs_lradc_id)of_id->data; + + lradc->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(lradc->clk)) { + dev_err(dev, "Failed to get the delay unit clock\n"); + return PTR_ERR(lradc->clk); + } + + ret = clk_prepare_enable(lradc->clk); + if (ret) { + dev_err(dev, "Failed to enable the delay unit clock\n"); + return ret; + } + + ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires", + &ts_wires); + + if (!ret) { + lradc->buffer_vchans = BUFFER_VCHANS_LIMITED; + + switch (ts_wires) { + case 4: + lradc->touchscreen_wire = MXS_LRADC_TOUCHSCREEN_4WIRE; + break; + case 5: + if (lradc->soc == IMX28_LRADC) { + lradc->touchscreen_wire = + MXS_LRADC_TOUCHSCREEN_5WIRE; + break; + } + /* fall through to an error message for i.MX23 */ + default: + dev_err(&pdev->dev, + "Unsupported number of touchscreen wires (%d)\n" + , ts_wires); + ret = -EINVAL; + goto err_clk; + } + } else { + lradc->buffer_vchans = BUFFER_VCHANS_ALL; + } + + platform_set_drvdata(pdev, lradc); + + switch (lradc->soc) { + case IMX23_LRADC: + cells[ADC_CELL].resources = mx23_adc_resources; + cells[ADC_CELL].num_resources = ARRAY_SIZE(mx23_adc_resources); + cells[TSC_CELL].resources = mx23_touchscreen_resources; + cells[TSC_CELL].num_resources = + ARRAY_SIZE(mx23_touchscreen_resources); + break; + case IMX28_LRADC: + cells[ADC_CELL].resources = mx28_adc_resources; + cells[ADC_CELL].num_resources = ARRAY_SIZE(mx28_adc_resources); + cells[TSC_CELL].resources = mx28_touchscreen_resources; + cells[TSC_CELL].num_resources = + ARRAY_SIZE(mx28_touchscreen_resources); + break; + default: + dev_err(dev, "Unsupported SoC\n"); + ret = -ENODEV; + goto err_clk; + } + + cells[ADC_CELL].platform_data = lradc; + cells[ADC_CELL].pdata_size = sizeof(*lradc); + + ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE, + &cells[ADC_CELL], 1, NULL, 0, NULL); + if (ret) { + dev_err(&pdev->dev, "Failed to add the ADC subdevice\n"); + goto err_clk; + } + + cells[TSC_CELL].platform_data = lradc; + cells[TSC_CELL].pdata_size = sizeof(*lradc); + + ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE, + &cells[TSC_CELL], 1, NULL, 0, NULL); + if (ret) { + dev_err(&pdev->dev, + "Failed to add the touchscreen subdevice\n"); + goto err_clk; + } + + return 0; + +err_clk: + clk_disable_unprepare(lradc->clk); + + return ret; +} + +static int mxs_lradc_remove(struct platform_device *pdev) +{ + struct mxs_lradc *lradc = platform_get_drvdata(pdev); + + clk_disable_unprepare(lradc->clk); + + return 0; +} + +static struct platform_driver mxs_lradc_driver = { + .driver = { + .name = "mxs-lradc", + .of_match_table = mxs_lradc_dt_ids, + }, + .probe = mxs_lradc_probe, + .remove = mxs_lradc_remove, +}; +module_platform_driver(mxs_lradc_driver); + +MODULE_AUTHOR("Ksenija Stanojevic <ksenija.stanojevic@gmail.com>"); +MODULE_DESCRIPTION("Freescale i.MX23/i.MX28 LRADC driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:mxs-lradc"); diff --git a/include/linux/mfd/mxs-lradc.h b/include/linux/mfd/mxs-lradc.h new file mode 100644 index 0000000..64140681 --- /dev/null +++ b/include/linux/mfd/mxs-lradc.h @@ -0,0 +1,203 @@ +/* + * Freescale MXS Low Resolution Analog-to-Digital Converter driver + * + * Copyright (c) 2012 DENX Software Engineering, GmbH. + * Copyright (c) 2016 Ksenija Stanojevic <ksenija.stanojevic@gmail.com> + * + * Author: Marek Vasut <marex@denx.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef __MFD_MXS_LRADC_H +#define __MFD_MXS_LRADC_H + +#include <linux/bitops.h> +#include <linux/io.h> +#include <linux/stmp_device.h> + +#define LRADC_MAX_DELAY_CHANS 4 +#define LRADC_MAX_MAPPED_CHANS 8 +#define LRADC_MAX_TOTAL_CHANS 16 + +#define LRADC_DELAY_TIMER_HZ 2000 + +#define LRADC_CTRL0 0x00 +# define LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE BIT(23) +# define LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE BIT(22) +# define LRADC_CTRL0_MX28_YNNSW /* YM */ BIT(21) +# define LRADC_CTRL0_MX28_YPNSW /* YP */ BIT(20) +# define LRADC_CTRL0_MX28_YPPSW /* YP */ BIT(19) +# define LRADC_CTRL0_MX28_XNNSW /* XM */ BIT(18) +# define LRADC_CTRL0_MX28_XNPSW /* XM */ BIT(17) +# define LRADC_CTRL0_MX28_XPPSW /* XP */ BIT(16) + +# define LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE BIT(20) +# define LRADC_CTRL0_MX23_YM BIT(19) +# define LRADC_CTRL0_MX23_XM BIT(18) +# define LRADC_CTRL0_MX23_YP BIT(17) +# define LRADC_CTRL0_MX23_XP BIT(16) + +# define LRADC_CTRL0_MX28_PLATE_MASK \ + (LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE | \ + LRADC_CTRL0_MX28_YNNSW | LRADC_CTRL0_MX28_YPNSW | \ + LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW | \ + LRADC_CTRL0_MX28_XNPSW | LRADC_CTRL0_MX28_XPPSW) + +# define LRADC_CTRL0_MX23_PLATE_MASK \ + (LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE | \ + LRADC_CTRL0_MX23_YM | LRADC_CTRL0_MX23_XM | \ + LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XP) + +#define LRADC_CTRL1 0x10 +#define LRADC_CTRL1_TOUCH_DETECT_IRQ_EN BIT(24) +#define LRADC_CTRL1_LRADC_IRQ_EN(n) (1 << ((n) + 16)) +#define LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK (0x1fff << 16) +#define LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK (0x01ff << 16) +#define LRADC_CTRL1_LRADC_IRQ_EN_OFFSET 16 +#define LRADC_CTRL1_TOUCH_DETECT_IRQ BIT(8) +#define LRADC_CTRL1_LRADC_IRQ(n) (1 << (n)) +#define LRADC_CTRL1_MX28_LRADC_IRQ_MASK 0x1fff +#define LRADC_CTRL1_MX23_LRADC_IRQ_MASK 0x01ff +#define LRADC_CTRL1_LRADC_IRQ_OFFSET 0 + +#define LRADC_CTRL2 0x20 +#define LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET 24 +#define LRADC_CTRL2_TEMPSENSE_PWD BIT(15) + +#define LRADC_STATUS 0x40 +#define LRADC_STATUS_TOUCH_DETECT_RAW BIT(0) + +#define LRADC_CH(n) (0x50 + (0x10 * (n))) +#define LRADC_CH_ACCUMULATE BIT(29) +#define LRADC_CH_NUM_SAMPLES_MASK (0x1f << 24) +#define LRADC_CH_NUM_SAMPLES_OFFSET 24 +#define LRADC_CH_NUM_SAMPLES(x) \ + ((x) << LRADC_CH_NUM_SAMPLES_OFFSET) +#define LRADC_CH_VALUE_MASK 0x3ffff +#define LRADC_CH_VALUE_OFFSET 0 + +#define LRADC_DELAY(n) (0xd0 + (0x10 * (n))) +#define LRADC_DELAY_TRIGGER_LRADCS_MASK (0xffUL << 24) +#define LRADC_DELAY_TRIGGER_LRADCS_OFFSET 24 +#define LRADC_DELAY_TRIGGER(x) \ + (((x) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) & \ + LRADC_DELAY_TRIGGER_LRADCS_MASK) +#define LRADC_DELAY_KICK BIT(20) +#define LRADC_DELAY_TRIGGER_DELAYS_MASK (0xf << 16) +#define LRADC_DELAY_TRIGGER_DELAYS_OFFSET 16 +#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 void mxs_lradc_reg_set(void __iomem *base, u32 val, u32 reg) +{ + writel(val, base + reg + STMP_OFFSET_REG_SET); +} + +static inline void mxs_lradc_reg_clear(void __iomem *base, u32 val, + u32 reg) +{ + writel(val, base + reg + STMP_OFFSET_REG_CLR); +} + +static inline void mxs_lradc_reg_wrt(void __iomem *base, u32 val, u32 reg) +{ + writel(val, base + reg); +} + +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 */

[v9,1/5] mfd: mxs-lradc: Add support for mxs-lradc MFD

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