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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
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");
1/* ADC MFD core driver for sunxi platforms
2 *
3 * Copyright (c) 2016 Quentin Schulz <quentin.schulz@free-electrons.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 */
9
10#include <linux/interrupt.h>
11#include <linux/kernel.h>
12#include <linux/mfd/core.h>
13#include <linux/module.h>
14#include <linux/of_device.h>
15#include <linux/of_irq.h>
16#include <linux/regmap.h>
17
18#include <linux/mfd/sun4i-gpadc.h>
19
20#define ARCH_SUN4I_A10 0
21#define ARCH_SUN5I_A13 1
22#define ARCH_SUN6I_A31 2
23
24static struct resource adc_resources[] = {
25 DEFINE_RES_IRQ_NAMED(SUN4I_GPADC_IRQ_FIFO_DATA, "FIFO_DATA_PENDING"),
26 DEFINE_RES_IRQ_NAMED(SUN4I_GPADC_IRQ_TEMP_DATA, "TEMP_DATA_PENDING"),
27};
28
29static const struct regmap_irq sun4i_gpadc_regmap_irq[] = {
30 REGMAP_IRQ_REG(SUN4I_GPADC_IRQ_FIFO_DATA, 0,
31 SUN4I_GPADC_INT_FIFOC_TP_DATA_IRQ_EN),
32 REGMAP_IRQ_REG(SUN4I_GPADC_IRQ_TEMP_DATA, 0,
33 SUN4I_GPADC_INT_FIFOC_TEMP_IRQ_EN),
34};
35
36static const struct regmap_irq_chip sun4i_gpadc_regmap_irq_chip = {
37 .name = "sun4i_gpadc_irq_chip",
38 .status_base = SUN4I_GPADC_INT_FIFOS,
39 .ack_base = SUN4I_GPADC_INT_FIFOS,
40 .mask_base = SUN4I_GPADC_INT_FIFOC,
41 .init_ack_masked = true,
42 .mask_invert = true,
43 .irqs = sun4i_gpadc_regmap_irq,
44 .num_irqs = ARRAY_SIZE(sun4i_gpadc_regmap_irq),
45 .num_regs = 1,
46};
47
48static struct mfd_cell sun4i_gpadc_cells[] = {
49 {
50 .name = "sun4i-a10-gpadc-iio",
51 .resources = adc_resources,
52 .num_resources = ARRAY_SIZE(adc_resources),
53 },
54 { .name = "iio_hwmon" }
55};
56
57static struct mfd_cell sun5i_gpadc_cells[] = {
58 {
59 .name = "sun5i-a13-gpadc-iio",
60 .resources = adc_resources,
61 .num_resources = ARRAY_SIZE(adc_resources),
62 },
63 { .name = "iio_hwmon" },
64};
65
66static struct mfd_cell sun6i_gpadc_cells[] = {
67 {
68 .name = "sun6i-a31-gpadc-iio",
69 .resources = adc_resources,
70 .num_resources = ARRAY_SIZE(adc_resources),
71 },
72 { .name = "iio_hwmon" },
73};
74
75static const struct regmap_config sun4i_gpadc_regmap_config = {
76 .reg_bits = 32,
77 .val_bits = 32,
78 .reg_stride = 4,
79 .fast_io = true,
80};
81
82static const struct of_device_id sun4i_gpadc_of_match[] = {
83 {
84 .compatible = "allwinner,sun4i-a10-ts",
85 .data = (void *)ARCH_SUN4I_A10,
86 }, {
87 .compatible = "allwinner,sun5i-a13-ts",
88 .data = (void *)ARCH_SUN5I_A13,
89 }, {
90 .compatible = "allwinner,sun6i-a31-ts",
91 .data = (void *)ARCH_SUN6I_A31,
92 }, { /* sentinel */ }
93};
94
95MODULE_DEVICE_TABLE(of, sun4i_gpadc_of_match);
96
97static int sun4i_gpadc_probe(struct platform_device *pdev)
98{
99 struct sun4i_gpadc_dev *dev;
100 struct resource *mem;
101 const struct of_device_id *of_id;
102 const struct mfd_cell *cells;
103 unsigned int irq, size;
104 int ret;
105
106 of_id = of_match_node(sun4i_gpadc_of_match, pdev->dev.of_node);
107 if (!of_id)
108 return -EINVAL;
109
110 switch ((long)of_id->data) {
111 case ARCH_SUN4I_A10:
112 cells = sun4i_gpadc_cells;
113 size = ARRAY_SIZE(sun4i_gpadc_cells);
114 break;
115 case ARCH_SUN5I_A13:
116 cells = sun5i_gpadc_cells;
117 size = ARRAY_SIZE(sun5i_gpadc_cells);
118 break;
119 case ARCH_SUN6I_A31:
120 cells = sun6i_gpadc_cells;
121 size = ARRAY_SIZE(sun6i_gpadc_cells);
122 break;
123 default:
124 return -EINVAL;
125 }
126
127 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
128 if (!dev)
129 return -ENOMEM;
130
131 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
132 dev->base = devm_ioremap_resource(&pdev->dev, mem);
133 if (IS_ERR(dev->base))
134 return PTR_ERR(dev->base);
135
136 dev->dev = &pdev->dev;
137 dev_set_drvdata(dev->dev, dev);
138
139 dev->regmap = devm_regmap_init_mmio(dev->dev, dev->base,
140 &sun4i_gpadc_regmap_config);
141 if (IS_ERR(dev->regmap)) {
142 ret = PTR_ERR(dev->regmap);
143 dev_err(&pdev->dev, "failed to init regmap: %d\n", ret);
144 return ret;
145 }
146
147 /* Disable all interrupts */
148 regmap_write(dev->regmap, SUN4I_GPADC_INT_FIFOC, 0);
149
150 irq = platform_get_irq(pdev, 0);
151 ret = devm_regmap_add_irq_chip(&pdev->dev, dev->regmap, irq,
152 IRQF_ONESHOT, 0,
153 &sun4i_gpadc_regmap_irq_chip,
154 &dev->regmap_irqc);
155 if (ret) {
156 dev_err(&pdev->dev, "failed to add irq chip: %d\n", ret);
157 return ret;
158 }
159
160 ret = devm_mfd_add_devices(dev->dev, 0, cells, size, NULL, 0, NULL);
161 if (ret) {
162 dev_err(&pdev->dev, "failed to add MFD devices: %d\n", ret);
163 return ret;
164 }
165
166 return 0;
167}
168
169static struct platform_driver sun4i_gpadc_driver = {
170 .driver = {
171 .name = "sun4i-gpadc",
172 .of_match_table = of_match_ptr(sun4i_gpadc_of_match),
173 },
174 .probe = sun4i_gpadc_probe,
175};
176
177module_platform_driver(sun4i_gpadc_driver);
178
179MODULE_DESCRIPTION("Allwinner sunxi platforms' GPADC MFD core driver");
180MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
181MODULE_LICENSE("GPL v2");