1// SPDX-License-Identifier: GPL-2.0-only
  2/* ADC MFD core driver for sunxi platforms
  3 *
  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_device.h>
 12#include <linux/of_irq.h>
 13#include <linux/regmap.h>
 14
 15#include <linux/mfd/sun4i-gpadc.h>
 16
 17#define ARCH_SUN4I_A10 0
 18#define ARCH_SUN5I_A13 1
 19#define ARCH_SUN6I_A31 2
 20
 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	.mask_base = SUN4I_GPADC_INT_FIFOC,
 38	.init_ack_masked = true,
 39	.mask_invert = true,
 40	.irqs = sun4i_gpadc_regmap_irq,
 41	.num_irqs = ARRAY_SIZE(sun4i_gpadc_regmap_irq),
 42	.num_regs = 1,
 43};
 44
 45static struct mfd_cell sun4i_gpadc_cells[] = {
 46	{
 47		.name	= "sun4i-a10-gpadc-iio",
 48		.resources = adc_resources,
 49		.num_resources = ARRAY_SIZE(adc_resources),
 50	},
 51	{ .name = "iio_hwmon" }
 52};
 53
 54static struct mfd_cell sun5i_gpadc_cells[] = {
 55	{
 56		.name	= "sun5i-a13-gpadc-iio",
 57		.resources = adc_resources,
 58		.num_resources = ARRAY_SIZE(adc_resources),
 59	},
 60	{ .name = "iio_hwmon" },
 61};
 62
 63static struct mfd_cell sun6i_gpadc_cells[] = {
 64	{
 65		.name	= "sun6i-a31-gpadc-iio",
 66		.resources = adc_resources,
 67		.num_resources = ARRAY_SIZE(adc_resources),
 68	},
 69	{ .name = "iio_hwmon" },
 70};
 71
 72static const struct regmap_config sun4i_gpadc_regmap_config = {
 73	.reg_bits = 32,
 74	.val_bits = 32,
 75	.reg_stride = 4,
 76	.fast_io = true,
 77};
 78
 79static const struct of_device_id sun4i_gpadc_of_match[] = {
 80	{
 81		.compatible = "allwinner,sun4i-a10-ts",
 82		.data = (void *)ARCH_SUN4I_A10,
 83	}, {
 84		.compatible = "allwinner,sun5i-a13-ts",
 85		.data = (void *)ARCH_SUN5I_A13,
 86	}, {
 87		.compatible = "allwinner,sun6i-a31-ts",
 88		.data = (void *)ARCH_SUN6I_A31,
 89	}, { /* sentinel */ }
 90};
 91
 92MODULE_DEVICE_TABLE(of, sun4i_gpadc_of_match);
 93
 94static int sun4i_gpadc_probe(struct platform_device *pdev)
 95{
 96	struct sun4i_gpadc_dev *dev;
 97	struct resource *mem;
 98	const struct of_device_id *of_id;
 99	const struct mfd_cell *cells;
100	unsigned int irq, size;
101	int ret;
102
103	of_id = of_match_node(sun4i_gpadc_of_match, pdev->dev.of_node);
104	if (!of_id)
105		return -EINVAL;
106
107	switch ((long)of_id->data) {
108	case ARCH_SUN4I_A10:
109		cells = sun4i_gpadc_cells;
110		size = ARRAY_SIZE(sun4i_gpadc_cells);
111		break;
112	case ARCH_SUN5I_A13:
113		cells = sun5i_gpadc_cells;
114		size = ARRAY_SIZE(sun5i_gpadc_cells);
115		break;
116	case ARCH_SUN6I_A31:
117		cells = sun6i_gpadc_cells;
118		size = ARRAY_SIZE(sun6i_gpadc_cells);
119		break;
120	default:
121		return -EINVAL;
122	}
123
124	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
125	if (!dev)
126		return -ENOMEM;
127
128	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
129	dev->base = devm_ioremap_resource(&pdev->dev, mem);
130	if (IS_ERR(dev->base))
131		return PTR_ERR(dev->base);
132
133	dev->dev = &pdev->dev;
134	dev_set_drvdata(dev->dev, dev);
135
136	dev->regmap = devm_regmap_init_mmio(dev->dev, dev->base,
137					    &sun4i_gpadc_regmap_config);
138	if (IS_ERR(dev->regmap)) {
139		ret = PTR_ERR(dev->regmap);
140		dev_err(&pdev->dev, "failed to init regmap: %d\n", ret);
141		return ret;
142	}
143
144	/* Disable all interrupts */
145	regmap_write(dev->regmap, SUN4I_GPADC_INT_FIFOC, 0);
146
147	irq = platform_get_irq(pdev, 0);
148	ret = devm_regmap_add_irq_chip(&pdev->dev, dev->regmap, irq,
149				       IRQF_ONESHOT, 0,
150				       &sun4i_gpadc_regmap_irq_chip,
151				       &dev->regmap_irqc);
152	if (ret) {
153		dev_err(&pdev->dev, "failed to add irq chip: %d\n", ret);
154		return ret;
155	}
156
157	ret = devm_mfd_add_devices(dev->dev, 0, cells, size, NULL, 0, NULL);
158	if (ret) {
159		dev_err(&pdev->dev, "failed to add MFD devices: %d\n", ret);
160		return ret;
161	}
162
163	return 0;
164}
165
166static struct platform_driver sun4i_gpadc_driver = {
167	.driver = {
168		.name = "sun4i-gpadc",
169		.of_match_table = sun4i_gpadc_of_match,
170	},
171	.probe = sun4i_gpadc_probe,
172};
173
174module_platform_driver(sun4i_gpadc_driver);
175
176MODULE_DESCRIPTION("Allwinner sunxi platforms' GPADC MFD core driver");
177MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
178MODULE_LICENSE("GPL v2");