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 | |
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(matches: sun4i_gpadc_of_match, node: 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(dev: &pdev->dev, size: sizeof(*dev), GFP_KERNEL); |
123 | if (!dev) |
124 | return -ENOMEM; |
125 | |
126 | dev->base = devm_platform_get_and_ioremap_resource(pdev, index: 0, NULL); |
127 | if (IS_ERR(ptr: dev->base)) |
128 | return PTR_ERR(ptr: dev->base); |
129 | |
130 | dev->dev = &pdev->dev; |
131 | dev_set_drvdata(dev: dev->dev, data: dev); |
132 | |
133 | dev->regmap = devm_regmap_init_mmio(dev->dev, dev->base, |
134 | &sun4i_gpadc_regmap_config); |
135 | if (IS_ERR(ptr: dev->regmap)) { |
136 | ret = PTR_ERR(ptr: 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(map: dev->regmap, SUN4I_GPADC_INT_FIFOC, val: 0); |
143 | |
144 | irq = platform_get_irq(pdev, 0); |
145 | ret = devm_regmap_add_irq_chip(dev: &pdev->dev, map: dev->regmap, irq, |
146 | IRQF_ONESHOT, irq_base: 0, |
147 | chip: &sun4i_gpadc_regmap_irq_chip, |
148 | data: &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->dev, id: 0, cells, n_devs: size, NULL, irq_base: 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 | |