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1// SPDX-License-Identifier: GPL-2.0-only2/* ADC MFD core driver for sunxi platforms3 *4 * Copyright (c) 2016 Quentin Schulz <quentin.schulz@free-electrons.com>5 */6 7#include <linux/interrupt.h>8#include <linux/kernel.h>9#include <linux/mfd/core.h>10#include <linux/module.h>11#include <linux/of.h>12#include <linux/platform_device.h>13#include <linux/regmap.h>14 15#include <linux/mfd/sun4i-gpadc.h>16 17#define ARCH_SUN4I_A10 018#define ARCH_SUN5I_A13 119#define ARCH_SUN6I_A31 220 21static const struct resource adc_resources[] = {22 DEFINE_RES_IRQ_NAMED(SUN4I_GPADC_IRQ_FIFO_DATA, "FIFO_DATA_PENDING"),23 DEFINE_RES_IRQ_NAMED(SUN4I_GPADC_IRQ_TEMP_DATA, "TEMP_DATA_PENDING"),24};25 26static const struct regmap_irq sun4i_gpadc_regmap_irq[] = {27 REGMAP_IRQ_REG(SUN4I_GPADC_IRQ_FIFO_DATA, 0,28 SUN4I_GPADC_INT_FIFOC_TP_DATA_IRQ_EN),29 REGMAP_IRQ_REG(SUN4I_GPADC_IRQ_TEMP_DATA, 0,30 SUN4I_GPADC_INT_FIFOC_TEMP_IRQ_EN),31};32 33static const struct regmap_irq_chip sun4i_gpadc_regmap_irq_chip = {34 .name = "sun4i_gpadc_irq_chip",35 .status_base = SUN4I_GPADC_INT_FIFOS,36 .ack_base = SUN4I_GPADC_INT_FIFOS,37 .unmask_base = SUN4I_GPADC_INT_FIFOC,38 .init_ack_masked = true,39 .irqs = sun4i_gpadc_regmap_irq,40 .num_irqs = ARRAY_SIZE(sun4i_gpadc_regmap_irq),41 .num_regs = 1,42};43 44static struct mfd_cell sun4i_gpadc_cells[] = {45 {46 .name = "sun4i-a10-gpadc-iio",47 .resources = adc_resources,48 .num_resources = ARRAY_SIZE(adc_resources),49 },50 { .name = "iio_hwmon" }51};52 53static struct mfd_cell sun5i_gpadc_cells[] = {54 {55 .name = "sun5i-a13-gpadc-iio",56 .resources = adc_resources,57 .num_resources = ARRAY_SIZE(adc_resources),58 },59 { .name = "iio_hwmon" },60};61 62static struct mfd_cell sun6i_gpadc_cells[] = {63 {64 .name = "sun6i-a31-gpadc-iio",65 .resources = adc_resources,66 .num_resources = ARRAY_SIZE(adc_resources),67 },68 { .name = "iio_hwmon" },69};70 71static const struct regmap_config sun4i_gpadc_regmap_config = {72 .reg_bits = 32,73 .val_bits = 32,74 .reg_stride = 4,75 .fast_io = true,76};77 78static const struct of_device_id sun4i_gpadc_of_match[] = {79 {80 .compatible = "allwinner,sun4i-a10-ts",81 .data = (void *)ARCH_SUN4I_A10,82 }, {83 .compatible = "allwinner,sun5i-a13-ts",84 .data = (void *)ARCH_SUN5I_A13,85 }, {86 .compatible = "allwinner,sun6i-a31-ts",87 .data = (void *)ARCH_SUN6I_A31,88 }, { /* sentinel */ }89};90 91MODULE_DEVICE_TABLE(of, sun4i_gpadc_of_match);92 93static int sun4i_gpadc_probe(struct platform_device *pdev)94{95 struct sun4i_gpadc_dev *dev;96 const struct of_device_id *of_id;97 const struct mfd_cell *cells;98 unsigned int irq, size;99 int ret;100 101 of_id = of_match_node(sun4i_gpadc_of_match, pdev->dev.of_node);102 if (!of_id)103 return -EINVAL;104 105 switch ((long)of_id->data) {106 case ARCH_SUN4I_A10:107 cells = sun4i_gpadc_cells;108 size = ARRAY_SIZE(sun4i_gpadc_cells);109 break;110 case ARCH_SUN5I_A13:111 cells = sun5i_gpadc_cells;112 size = ARRAY_SIZE(sun5i_gpadc_cells);113 break;114 case ARCH_SUN6I_A31:115 cells = sun6i_gpadc_cells;116 size = ARRAY_SIZE(sun6i_gpadc_cells);117 break;118 default:119 return -EINVAL;120 }121 122 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);123 if (!dev)124 return -ENOMEM;125 126 dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);127 if (IS_ERR(dev->base))128 return PTR_ERR(dev->base);129 130 dev->dev = &pdev->dev;131 dev_set_drvdata(dev->dev, dev);132 133 dev->regmap = devm_regmap_init_mmio(dev->dev, dev->base,134 &sun4i_gpadc_regmap_config);135 if (IS_ERR(dev->regmap)) {136 ret = PTR_ERR(dev->regmap);137 dev_err(&pdev->dev, "failed to init regmap: %d\n", ret);138 return ret;139 }140 141 /* Disable all interrupts */142 regmap_write(dev->regmap, SUN4I_GPADC_INT_FIFOC, 0);143 144 irq = platform_get_irq(pdev, 0);145 ret = devm_regmap_add_irq_chip(&pdev->dev, dev->regmap, irq,146 IRQF_ONESHOT, 0,147 &sun4i_gpadc_regmap_irq_chip,148 &dev->regmap_irqc);149 if (ret) {150 dev_err(&pdev->dev, "failed to add irq chip: %d\n", ret);151 return ret;152 }153 154 ret = devm_mfd_add_devices(dev->dev, 0, cells, size, NULL, 0, NULL);155 if (ret) {156 dev_err(&pdev->dev, "failed to add MFD devices: %d\n", ret);157 return ret;158 }159 160 return 0;161}162 163static struct platform_driver sun4i_gpadc_driver = {164 .driver = {165 .name = "sun4i-gpadc",166 .of_match_table = sun4i_gpadc_of_match,167 },168 .probe = sun4i_gpadc_probe,169};170 171module_platform_driver(sun4i_gpadc_driver);172 173MODULE_DESCRIPTION("Allwinner sunxi platforms' GPADC MFD core driver");174MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");175MODULE_LICENSE("GPL v2");176