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.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 0
18 #define ARCH_SUN5I_A13 1
19 #define ARCH_SUN6I_A31 2
20
21 static 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
26 static 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
33 static 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
44 static 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
53 static 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
62 static 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
71 static 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
78 static 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
91 MODULE_DEVICE_TABLE(of, sun4i_gpadc_of_match);
92
sun4i_gpadc_probe(struct platform_device * pdev)93 static 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
163 static 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
171 module_platform_driver(sun4i_gpadc_driver);
172
173 MODULE_DESCRIPTION("Allwinner sunxi platforms' GPADC MFD core driver");
174 MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
175 MODULE_LICENSE("GPL v2");
176