On 16/11/15 12:01, Markus Pargmann wrote: > This is the core driver for imx25 touchscreen/adc driver. The module > has one shared ADC and two different conversion queues which use the > ADC. The two queues are identical. Both can be used for general purpose > ADC but one is meant to be used for touchscreens. > > This driver is the core which manages the central components and > registers of the TSC/ADC unit. It manages the IRQs and forwards them to > the correct components. > > Signed-off-by: Markus Pargmann <mpa@xxxxxxxxxxxxxx> > Signed-off-by: Denis Carikli <denis@xxxxxxxxxx> > > [ensure correct ADC clock depending on the IPG clock] > Signed-off-by: Juergen Borleis <jbe@xxxxxxxxxxxxxx> Looks good to me - one query on meaning of a comment inline. Acked-by: Jonathan Cameron <jic23@xxxxxxxxxx> I'm taking the view this series wants to go through the MFD tree but don't mind if it goes through IIO or input instead if there is a good reason to do so. Jonathan > --- > > Notes: > Changes in v7: > - Cleanup bit defines in header files to be more readable > - Fix irq check to return with an error for irq <= 0 > - Add COMPILE_TEST in Kconfig file > > Changes in v5: > - Remove ifdef CONFIG_OF as this driver is only for DT usage > - Remove module owner > - Add Kconfig dependencies ARCH_MX25 and OF > > @Jonathan Cameron: > I left your acked-by on the patch as these were small changes. If it should be > removed, please say so. Thanks > > drivers/mfd/Kconfig | 9 ++ > drivers/mfd/Makefile | 2 + > drivers/mfd/fsl-imx25-tsadc.c | 204 ++++++++++++++++++++++++++++++++++++++++ > include/linux/mfd/imx25-tsadc.h | 140 +++++++++++++++++++++++++++ > 4 files changed, 355 insertions(+) > create mode 100644 drivers/mfd/fsl-imx25-tsadc.c > create mode 100644 include/linux/mfd/imx25-tsadc.h > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig > index 4d92df6ef9fe..4222e202ad2b 100644 > --- a/drivers/mfd/Kconfig > +++ b/drivers/mfd/Kconfig > @@ -271,6 +271,15 @@ config MFD_MC13XXX_I2C > help > Select this if your MC13xxx is connected via an I2C bus. > > +config MFD_MX25_TSADC > + tristate "Freescale i.MX25 integrated Touchscreen and ADC unit" > + select REGMAP_MMIO > + depends on (SOC_IMX25 && OF) || COMPILE_TEST > + help > + Enable support for the integrated Touchscreen and ADC unit of the > + i.MX25 processors. They consist of a conversion queue for general > + purpose ADC and a queue for Touchscreens. > + > config MFD_HI6421_PMIC > tristate "HiSilicon Hi6421 PMU/Codec IC" > depends on OF > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile > index a8b76b81b467..5741be88c173 100644 > --- a/drivers/mfd/Makefile > +++ b/drivers/mfd/Makefile > @@ -81,6 +81,8 @@ obj-$(CONFIG_TWL4030_POWER) += twl4030-power.o > obj-$(CONFIG_MFD_TWL4030_AUDIO) += twl4030-audio.o > obj-$(CONFIG_TWL6040_CORE) += twl6040.o > > +obj-$(CONFIG_MFD_MX25_TSADC) += fsl-imx25-tsadc.o > + > obj-$(CONFIG_MFD_MC13XXX) += mc13xxx-core.o > obj-$(CONFIG_MFD_MC13XXX_SPI) += mc13xxx-spi.o > obj-$(CONFIG_MFD_MC13XXX_I2C) += mc13xxx-i2c.o > diff --git a/drivers/mfd/fsl-imx25-tsadc.c b/drivers/mfd/fsl-imx25-tsadc.c > new file mode 100644 > index 000000000000..e67d5ca81e10 > --- /dev/null > +++ b/drivers/mfd/fsl-imx25-tsadc.c > @@ -0,0 +1,204 @@ > +/* > + * Copyright (C) 2014-2015 Pengutronix, Markus Pargmann <mpa@xxxxxxxxxxxxxx> > + * > + * This program is free software; you can redistribute it and/or modify it under > + * the terms of the GNU General Public License version 2 as published by the > + * Free Software Foundation. > + */ > + > +#include <linux/clk.h> > +#include <linux/interrupt.h> > +#include <linux/irqchip/chained_irq.h> > +#include <linux/irqdesc.h> > +#include <linux/irqdomain.h> > +#include <linux/irq.h> > +#include <linux/mfd/imx25-tsadc.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/of_platform.h> > +#include <linux/platform_device.h> > +#include <linux/regmap.h> > + > +static struct regmap_config mx25_tsadc_regmap_config = { > + .fast_io = true, > + .max_register = 8, > + .reg_bits = 32, > + .val_bits = 32, > + .reg_stride = 4, > +}; > + > +static void mx25_tsadc_irq_handler(struct irq_desc *desc) > +{ > + struct mx25_tsadc *tsadc = irq_desc_get_handler_data(desc); > + struct irq_chip *chip = irq_desc_get_chip(desc); > + u32 status; > + > + chained_irq_enter(chip, desc); > + > + regmap_read(tsadc->regs, MX25_TSC_TGSR, &status); > + > + if (status & MX25_TGSR_GCQ_INT) > + generic_handle_irq(irq_find_mapping(tsadc->domain, 1)); > + > + if (status & MX25_TGSR_TCQ_INT) > + generic_handle_irq(irq_find_mapping(tsadc->domain, 0)); > + > + chained_irq_exit(chip, desc); > +} > + > +static int mx25_tsadc_domain_map(struct irq_domain *d, unsigned int irq, > + irq_hw_number_t hwirq) > +{ > + struct mx25_tsadc *tsadc = d->host_data; > + > + irq_set_chip_data(irq, tsadc); > + irq_set_chip_and_handler(irq, &dummy_irq_chip, > + handle_level_irq); > + irq_modify_status(irq, IRQ_NOREQUEST, IRQ_NOPROBE); > + > + return 0; > +} > + > +static struct irq_domain_ops mx25_tsadc_domain_ops = { > + .map = mx25_tsadc_domain_map, > + .xlate = irq_domain_xlate_onecell, > +}; > + > +static int mx25_tsadc_setup_irq(struct platform_device *pdev, > + struct mx25_tsadc *tsadc) > +{ > + struct device *dev = &pdev->dev; > + struct device_node *np = dev->of_node; > + int irq; > + > + irq = platform_get_irq(pdev, 0); > + if (irq <= 0) { > + dev_err(dev, "Failed to get irq\n"); > + return irq; > + } > + > + tsadc->domain = irq_domain_add_simple(np, 2, 0, &mx25_tsadc_domain_ops, > + tsadc); > + if (!tsadc->domain) { > + dev_err(dev, "Failed to add irq domain\n"); > + return -ENOMEM; > + } > + > + irq_set_chained_handler(irq, mx25_tsadc_irq_handler); > + irq_set_handler_data(irq, tsadc); > + > + return 0; > +} > + > +static void mx25_tsadc_setup_clk(struct platform_device *pdev, > + struct mx25_tsadc *tsadc) > +{ > + unsigned clk_div; > + > + /* > + * According to the datasheet the ADC clock should never > + * exceed 1,75 MHz. Base clock is the IPG and the ADC unit uses > + * a funny clock divider. To keep the time constant the ADC needs to do > + * one conversion, adapt the ADC internal clock divider to > + * the available IPG I'm not entirely following this explanation... maybe ...one conversion, then adapt the ADC... > + */ > + > + dev_dbg(&pdev->dev, "Found master clock at %lu Hz\n", > + clk_get_rate(tsadc->clk)); > + > + clk_div = DIV_ROUND_UP(clk_get_rate(tsadc->clk), 1750000); > + dev_dbg(&pdev->dev, "Setting up ADC clock divider to %u\n", clk_div); > + > + /* adc clock = IPG clock / (2 * div + 2) */ > + clk_div -= 2; > + clk_div /= 2; > + > + /* > + * the ADC clock divider changes its behaviour when values below 4 > + * are used: it is fixed to "/ 10" in this case > + */ > + clk_div = max_t(unsigned, 4, clk_div); > + > + dev_dbg(&pdev->dev, "Resulting ADC conversion clock at %lu Hz\n", > + clk_get_rate(tsadc->clk) / (2 * clk_div + 2)); > + > + regmap_update_bits(tsadc->regs, MX25_TSC_TGCR, > + MX25_TGCR_ADCCLKCFG(0x1f), > + MX25_TGCR_ADCCLKCFG(clk_div)); > +} > + > +static int mx25_tsadc_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct device_node *np = dev->of_node; > + struct mx25_tsadc *tsadc; > + struct resource *res; > + int ret; > + void __iomem *iomem; > + > + tsadc = devm_kzalloc(dev, sizeof(*tsadc), GFP_KERNEL); > + if (!tsadc) > + return -ENOMEM; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + iomem = devm_ioremap_resource(dev, res); > + if (IS_ERR(iomem)) > + return PTR_ERR(iomem); > + > + tsadc->regs = devm_regmap_init_mmio(dev, iomem, > + &mx25_tsadc_regmap_config); > + if (IS_ERR(tsadc->regs)) { > + dev_err(dev, "Failed to initialize regmap\n"); > + return PTR_ERR(tsadc->regs); > + } > + > + tsadc->clk = devm_clk_get(dev, "ipg"); > + if (IS_ERR(tsadc->clk)) { > + dev_err(dev, "Failed to get ipg clock\n"); > + return PTR_ERR(tsadc->clk); > + } > + > + /* setup clock according to the datasheet */ > + mx25_tsadc_setup_clk(pdev, tsadc); > + > + /* Enable clock and reset the component */ > + regmap_update_bits(tsadc->regs, MX25_TSC_TGCR, MX25_TGCR_CLK_EN, > + MX25_TGCR_CLK_EN); > + regmap_update_bits(tsadc->regs, MX25_TSC_TGCR, MX25_TGCR_TSC_RST, > + MX25_TGCR_TSC_RST); > + > + /* Setup powersaving mode, but enable internal reference voltage */ > + regmap_update_bits(tsadc->regs, MX25_TSC_TGCR, MX25_TGCR_POWERMODE_MASK, > + MX25_TGCR_POWERMODE_SAVE); > + regmap_update_bits(tsadc->regs, MX25_TSC_TGCR, MX25_TGCR_INTREFEN, > + MX25_TGCR_INTREFEN); > + > + ret = mx25_tsadc_setup_irq(pdev, tsadc); > + if (ret) > + return ret; > + > + platform_set_drvdata(pdev, tsadc); > + > + of_platform_populate(np, NULL, NULL, dev); > + > + return 0; > +} > + > +static const struct of_device_id mx25_tsadc_ids[] = { > + { .compatible = "fsl,imx25-tsadc" }, > + { /* Sentinel */ } > +}; > + > +static struct platform_driver mx25_tsadc_driver = { > + .driver = { > + .name = "mx25-tsadc", > + .of_match_table = of_match_ptr(mx25_tsadc_ids), > + }, > + .probe = mx25_tsadc_probe, > +}; > +module_platform_driver(mx25_tsadc_driver); > + > +MODULE_DESCRIPTION("MFD for ADC/TSC for Freescale mx25"); > +MODULE_AUTHOR("Markus Pargmann <mpa@xxxxxxxxxxxxxx>"); > +MODULE_LICENSE("GPL v2"); > +MODULE_ALIAS("platform:mx25-tsadc"); > diff --git a/include/linux/mfd/imx25-tsadc.h b/include/linux/mfd/imx25-tsadc.h > new file mode 100644 > index 000000000000..7fe4b8c3baac > --- /dev/null > +++ b/include/linux/mfd/imx25-tsadc.h > @@ -0,0 +1,140 @@ > +#ifndef _LINUX_INCLUDE_MFD_IMX25_TSADC_H_ > +#define _LINUX_INCLUDE_MFD_IMX25_TSADC_H_ > + > +struct regmap; > +struct clk; > + > +struct mx25_tsadc { > + struct regmap *regs; > + struct irq_domain *domain; > + struct clk *clk; > +}; > + > +#define MX25_TSC_TGCR 0x00 > +#define MX25_TSC_TGSR 0x04 > +#define MX25_TSC_TICR 0x08 > + > +/* The same register layout for TC and GC queue */ > +#define MX25_ADCQ_FIFO 0x00 > +#define MX25_ADCQ_CR 0x04 > +#define MX25_ADCQ_SR 0x08 > +#define MX25_ADCQ_MR 0x0c > +#define MX25_ADCQ_ITEM_7_0 0x20 > +#define MX25_ADCQ_ITEM_15_8 0x24 > +#define MX25_ADCQ_CFG(n) (0x40 + ((n) * 0x4)) > + > +#define MX25_ADCQ_MR_MASK 0xffffffff > + > +/* TGCR */ > +#define MX25_TGCR_PDBTIME(x) ((x) << 25) > +#define MX25_TGCR_PDBTIME_MASK GENMASK(31, 25) > +#define MX25_TGCR_PDBEN BIT(24) > +#define MX25_TGCR_PDEN BIT(23) > +#define MX25_TGCR_ADCCLKCFG(x) ((x) << 16) > +#define MX25_TGCR_GET_ADCCLK(x) (((x) >> 16) & 0x1f) > +#define MX25_TGCR_INTREFEN BIT(10) > +#define MX25_TGCR_POWERMODE_MASK GENMASK(9, 8) > +#define MX25_TGCR_POWERMODE_SAVE (1 << 8) > +#define MX25_TGCR_POWERMODE_ON (2 << 8) > +#define MX25_TGCR_STLC BIT(5) > +#define MX25_TGCR_SLPC BIT(4) > +#define MX25_TGCR_FUNC_RST BIT(2) > +#define MX25_TGCR_TSC_RST BIT(1) > +#define MX25_TGCR_CLK_EN BIT(0) > + > +/* TGSR */ > +#define MX25_TGSR_SLP_INT BIT(2) > +#define MX25_TGSR_GCQ_INT BIT(1) > +#define MX25_TGSR_TCQ_INT BIT(0) > + > +/* ADCQ_ITEM_* */ > +#define _MX25_ADCQ_ITEM(item, x) ((x) << ((item) * 4)) > +#define MX25_ADCQ_ITEM(item, x) ((item) >= 8 ? \ > + _MX25_ADCQ_ITEM((item) - 8, (x)) : _MX25_ADCQ_ITEM((item), (x))) > + > +/* ADCQ_FIFO (TCQFIFO and GCQFIFO) */ > +#define MX25_ADCQ_FIFO_DATA(x) (((x) >> 4) & 0xfff) > +#define MX25_ADCQ_FIFO_ID(x) ((x) & 0xf) > + > +/* ADCQ_CR (TCQR and GCQR) */ > +#define MX25_ADCQ_CR_PDCFG_LEVEL BIT(19) > +#define MX25_ADCQ_CR_PDMSK BIT(18) > +#define MX25_ADCQ_CR_FRST BIT(17) > +#define MX25_ADCQ_CR_QRST BIT(16) > +#define MX25_ADCQ_CR_RWAIT_MASK GENMASK(15, 12) > +#define MX25_ADCQ_CR_RWAIT(x) ((x) << 12) > +#define MX25_ADCQ_CR_WMRK_MASK GENMASK(11, 8) > +#define MX25_ADCQ_CR_WMRK(x) ((x) << 8) > +#define MX25_ADCQ_CR_LITEMID_MASK (0xf << 4) > +#define MX25_ADCQ_CR_LITEMID(x) ((x) << 4) > +#define MX25_ADCQ_CR_RPT BIT(3) > +#define MX25_ADCQ_CR_FQS BIT(2) > +#define MX25_ADCQ_CR_QSM_MASK GENMASK(1, 0) > +#define MX25_ADCQ_CR_QSM_PD 0x1 > +#define MX25_ADCQ_CR_QSM_FQS 0x2 > +#define MX25_ADCQ_CR_QSM_FQS_PD 0x3 > + > +/* ADCQ_SR (TCQSR and GCQSR) */ > +#define MX25_ADCQ_SR_FDRY BIT(15) > +#define MX25_ADCQ_SR_FULL BIT(14) > +#define MX25_ADCQ_SR_EMPT BIT(13) > +#define MX25_ADCQ_SR_FDN(x) (((x) >> 8) & 0x1f) > +#define MX25_ADCQ_SR_FRR BIT(6) > +#define MX25_ADCQ_SR_FUR BIT(5) > +#define MX25_ADCQ_SR_FOR BIT(4) > +#define MX25_ADCQ_SR_EOQ BIT(1) > +#define MX25_ADCQ_SR_PD BIT(0) > + > +/* ADCQ_MR (TCQMR and GCQMR) */ > +#define MX25_ADCQ_MR_FDRY_DMA BIT(31) > +#define MX25_ADCQ_MR_FER_DMA BIT(22) > +#define MX25_ADCQ_MR_FUR_DMA BIT(21) > +#define MX25_ADCQ_MR_FOR_DMA BIT(20) > +#define MX25_ADCQ_MR_EOQ_DMA BIT(17) > +#define MX25_ADCQ_MR_PD_DMA BIT(16) > +#define MX25_ADCQ_MR_FDRY_IRQ BIT(15) > +#define MX25_ADCQ_MR_FER_IRQ BIT(6) > +#define MX25_ADCQ_MR_FUR_IRQ BIT(5) > +#define MX25_ADCQ_MR_FOR_IRQ BIT(4) > +#define MX25_ADCQ_MR_EOQ_IRQ BIT(1) > +#define MX25_ADCQ_MR_PD_IRQ BIT(0) > + > +/* ADCQ_CFG (TICR, TCC0-7,GCC0-7) */ > +#define MX25_ADCQ_CFG_SETTLING_TIME(x) ((x) << 24) > +#define MX25_ADCQ_CFG_IGS (1 << 20) > +#define MX25_ADCQ_CFG_NOS_MASK GENMASK(19, 16) > +#define MX25_ADCQ_CFG_NOS(x) (((x) - 1) << 16) > +#define MX25_ADCQ_CFG_WIPER (1 << 15) > +#define MX25_ADCQ_CFG_YNLR (1 << 14) > +#define MX25_ADCQ_CFG_YPLL_HIGH (0 << 12) > +#define MX25_ADCQ_CFG_YPLL_OFF (1 << 12) > +#define MX25_ADCQ_CFG_YPLL_LOW (3 << 12) > +#define MX25_ADCQ_CFG_XNUR_HIGH (0 << 10) > +#define MX25_ADCQ_CFG_XNUR_OFF (1 << 10) > +#define MX25_ADCQ_CFG_XNUR_LOW (3 << 10) > +#define MX25_ADCQ_CFG_XPUL_HIGH (0 << 9) > +#define MX25_ADCQ_CFG_XPUL_OFF (1 << 9) > +#define MX25_ADCQ_CFG_REFP(sel) ((sel) << 7) > +#define MX25_ADCQ_CFG_REFP_YP MX25_ADCQ_CFG_REFP(0) > +#define MX25_ADCQ_CFG_REFP_XP MX25_ADCQ_CFG_REFP(1) > +#define MX25_ADCQ_CFG_REFP_EXT MX25_ADCQ_CFG_REFP(2) > +#define MX25_ADCQ_CFG_REFP_INT MX25_ADCQ_CFG_REFP(3) > +#define MX25_ADCQ_CFG_REFP_MASK GENMASK(8, 7) > +#define MX25_ADCQ_CFG_IN(sel) ((sel) << 4) > +#define MX25_ADCQ_CFG_IN_XP MX25_ADCQ_CFG_IN(0) > +#define MX25_ADCQ_CFG_IN_YP MX25_ADCQ_CFG_IN(1) > +#define MX25_ADCQ_CFG_IN_XN MX25_ADCQ_CFG_IN(2) > +#define MX25_ADCQ_CFG_IN_YN MX25_ADCQ_CFG_IN(3) > +#define MX25_ADCQ_CFG_IN_WIPER MX25_ADCQ_CFG_IN(4) > +#define MX25_ADCQ_CFG_IN_AUX0 MX25_ADCQ_CFG_IN(5) > +#define MX25_ADCQ_CFG_IN_AUX1 MX25_ADCQ_CFG_IN(6) > +#define MX25_ADCQ_CFG_IN_AUX2 MX25_ADCQ_CFG_IN(7) > +#define MX25_ADCQ_CFG_REFN(sel) ((sel) << 2) > +#define MX25_ADCQ_CFG_REFN_XN MX25_ADCQ_CFG_REFN(0) > +#define MX25_ADCQ_CFG_REFN_YN MX25_ADCQ_CFG_REFN(1) > +#define MX25_ADCQ_CFG_REFN_NGND MX25_ADCQ_CFG_REFN(2) > +#define MX25_ADCQ_CFG_REFN_NGND2 MX25_ADCQ_CFG_REFN(3) > +#define MX25_ADCQ_CFG_REFN_MASK GENMASK(3, 2) > +#define MX25_ADCQ_CFG_PENIACK (1 << 1) > + > +#endif /* _LINUX_INCLUDE_MFD_IMX25_TSADC_H_ */ > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html