GNU Linux-libre 5.10.219-gnu1
[releases.git] / drivers / mfd / atmel-hlcdc.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2014 Free Electrons
4  * Copyright (C) 2014 Atmel
5  *
6  * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
7  */
8
9 #include <linux/clk.h>
10 #include <linux/iopoll.h>
11 #include <linux/mfd/atmel-hlcdc.h>
12 #include <linux/mfd/core.h>
13 #include <linux/module.h>
14 #include <linux/mod_devicetable.h>
15 #include <linux/platform_device.h>
16 #include <linux/regmap.h>
17
18 #define ATMEL_HLCDC_REG_MAX             (0x4000 - 0x4)
19
20 struct atmel_hlcdc_regmap {
21         void __iomem *regs;
22         struct device *dev;
23 };
24
25 static const struct mfd_cell atmel_hlcdc_cells[] = {
26         {
27                 .name = "atmel-hlcdc-pwm",
28                 .of_compatible = "atmel,hlcdc-pwm",
29         },
30         {
31                 .name = "atmel-hlcdc-dc",
32                 .of_compatible = "atmel,hlcdc-display-controller",
33         },
34 };
35
36 static int regmap_atmel_hlcdc_reg_write(void *context, unsigned int reg,
37                                         unsigned int val)
38 {
39         struct atmel_hlcdc_regmap *hregmap = context;
40
41         if (reg <= ATMEL_HLCDC_DIS) {
42                 u32 status;
43                 int ret;
44
45                 ret = readl_poll_timeout_atomic(hregmap->regs + ATMEL_HLCDC_SR,
46                                                 status,
47                                                 !(status & ATMEL_HLCDC_SIP),
48                                                 1, 100);
49                 if (ret) {
50                         dev_err(hregmap->dev,
51                                 "Timeout! Clock domain synchronization is in progress!\n");
52                         return ret;
53                 }
54         }
55
56         writel(val, hregmap->regs + reg);
57
58         return 0;
59 }
60
61 static int regmap_atmel_hlcdc_reg_read(void *context, unsigned int reg,
62                                        unsigned int *val)
63 {
64         struct atmel_hlcdc_regmap *hregmap = context;
65
66         *val = readl(hregmap->regs + reg);
67
68         return 0;
69 }
70
71 static const struct regmap_config atmel_hlcdc_regmap_config = {
72         .reg_bits = 32,
73         .val_bits = 32,
74         .reg_stride = 4,
75         .max_register = ATMEL_HLCDC_REG_MAX,
76         .reg_write = regmap_atmel_hlcdc_reg_write,
77         .reg_read = regmap_atmel_hlcdc_reg_read,
78         .fast_io = true,
79 };
80
81 static int atmel_hlcdc_probe(struct platform_device *pdev)
82 {
83         struct atmel_hlcdc_regmap *hregmap;
84         struct device *dev = &pdev->dev;
85         struct atmel_hlcdc *hlcdc;
86         struct resource *res;
87
88         hregmap = devm_kzalloc(dev, sizeof(*hregmap), GFP_KERNEL);
89         if (!hregmap)
90                 return -ENOMEM;
91
92         hlcdc = devm_kzalloc(dev, sizeof(*hlcdc), GFP_KERNEL);
93         if (!hlcdc)
94                 return -ENOMEM;
95
96         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
97         hregmap->regs = devm_ioremap_resource(dev, res);
98         if (IS_ERR(hregmap->regs))
99                 return PTR_ERR(hregmap->regs);
100
101         hregmap->dev = &pdev->dev;
102
103         hlcdc->irq = platform_get_irq(pdev, 0);
104         if (hlcdc->irq < 0)
105                 return hlcdc->irq;
106
107         hlcdc->periph_clk = devm_clk_get(dev, "periph_clk");
108         if (IS_ERR(hlcdc->periph_clk)) {
109                 dev_err(dev, "failed to get peripheral clock\n");
110                 return PTR_ERR(hlcdc->periph_clk);
111         }
112
113         hlcdc->sys_clk = devm_clk_get(dev, "sys_clk");
114         if (IS_ERR(hlcdc->sys_clk)) {
115                 dev_err(dev, "failed to get system clock\n");
116                 return PTR_ERR(hlcdc->sys_clk);
117         }
118
119         hlcdc->slow_clk = devm_clk_get(dev, "slow_clk");
120         if (IS_ERR(hlcdc->slow_clk)) {
121                 dev_err(dev, "failed to get slow clock\n");
122                 return PTR_ERR(hlcdc->slow_clk);
123         }
124
125         hlcdc->regmap = devm_regmap_init(dev, NULL, hregmap,
126                                          &atmel_hlcdc_regmap_config);
127         if (IS_ERR(hlcdc->regmap))
128                 return PTR_ERR(hlcdc->regmap);
129
130         dev_set_drvdata(dev, hlcdc);
131
132         return devm_mfd_add_devices(dev, -1, atmel_hlcdc_cells,
133                                     ARRAY_SIZE(atmel_hlcdc_cells),
134                                     NULL, 0, NULL);
135 }
136
137 static const struct of_device_id atmel_hlcdc_match[] = {
138         { .compatible = "atmel,at91sam9n12-hlcdc" },
139         { .compatible = "atmel,at91sam9x5-hlcdc" },
140         { .compatible = "atmel,sama5d2-hlcdc" },
141         { .compatible = "atmel,sama5d3-hlcdc" },
142         { .compatible = "atmel,sama5d4-hlcdc" },
143         { .compatible = "microchip,sam9x60-hlcdc" },
144         { /* sentinel */ },
145 };
146 MODULE_DEVICE_TABLE(of, atmel_hlcdc_match);
147
148 static struct platform_driver atmel_hlcdc_driver = {
149         .probe = atmel_hlcdc_probe,
150         .driver = {
151                 .name = "atmel-hlcdc",
152                 .of_match_table = atmel_hlcdc_match,
153         },
154 };
155 module_platform_driver(atmel_hlcdc_driver);
156
157 MODULE_ALIAS("platform:atmel-hlcdc");
158 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
159 MODULE_DESCRIPTION("Atmel HLCDC driver");
160 MODULE_LICENSE("GPL v2");