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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
937d3a0a QS |
2 | /* ADC MFD core driver for sunxi platforms |
3 | * | |
4 | * Copyright (c) 2016 Quentin Schulz <quentin.schulz@free-electrons.com> | |
937d3a0a QS |
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 | ||
21 | static 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 | .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 | ||
45 | static 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 | ||
54 | static 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 | ||
63 | static 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 | ||
72 | static 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 | ||
79 | static 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 | ||
92 | MODULE_DEVICE_TABLE(of, sun4i_gpadc_of_match); | |
93 | ||
94 | static 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 | ||
e8ae79d6 | 107 | switch ((long)of_id->data) { |
937d3a0a QS |
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 | ||
166 | static struct platform_driver sun4i_gpadc_driver = { | |
167 | .driver = { | |
168 | .name = "sun4i-gpadc", | |
169 | .of_match_table = of_match_ptr(sun4i_gpadc_of_match), | |
170 | }, | |
171 | .probe = sun4i_gpadc_probe, | |
172 | }; | |
173 | ||
174 | module_platform_driver(sun4i_gpadc_driver); | |
175 | ||
176 | MODULE_DESCRIPTION("Allwinner sunxi platforms' GPADC MFD core driver"); | |
177 | MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>"); | |
178 | MODULE_LICENSE("GPL v2"); |