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1 | /* |
2 | * Copyright (C) 2014 Free Electrons | |
3 | * Copyright (C) 2014 Atmel | |
4 | * | |
5 | * Author: Boris BREZILLON <boris.brezillon@free-electrons.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License version 2 as published by | |
9 | * the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | * more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along with | |
17 | * this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <linux/clk.h> | |
21 | #include <linux/mfd/atmel-hlcdc.h> | |
22 | #include <linux/mfd/core.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/regmap.h> | |
26 | ||
27 | #define ATMEL_HLCDC_REG_MAX (0x4000 - 0x4) | |
28 | ||
29 | static const struct mfd_cell atmel_hlcdc_cells[] = { | |
30 | { | |
31 | .name = "atmel-hlcdc-pwm", | |
32 | .of_compatible = "atmel,hlcdc-pwm", | |
33 | }, | |
34 | { | |
35 | .name = "atmel-hlcdc-dc", | |
36 | .of_compatible = "atmel,hlcdc-display-controller", | |
37 | }, | |
38 | }; | |
39 | ||
40 | static const struct regmap_config atmel_hlcdc_regmap_config = { | |
41 | .reg_bits = 32, | |
42 | .val_bits = 32, | |
43 | .reg_stride = 4, | |
44 | .max_register = ATMEL_HLCDC_REG_MAX, | |
45 | }; | |
46 | ||
47 | static int atmel_hlcdc_probe(struct platform_device *pdev) | |
48 | { | |
49 | struct device *dev = &pdev->dev; | |
50 | struct atmel_hlcdc *hlcdc; | |
51 | struct resource *res; | |
52 | void __iomem *regs; | |
53 | ||
54 | hlcdc = devm_kzalloc(dev, sizeof(*hlcdc), GFP_KERNEL); | |
55 | if (!hlcdc) | |
56 | return -ENOMEM; | |
57 | ||
58 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
59 | regs = devm_ioremap_resource(dev, res); | |
60 | if (IS_ERR(regs)) | |
61 | return PTR_ERR(regs); | |
62 | ||
63 | hlcdc->irq = platform_get_irq(pdev, 0); | |
64 | if (hlcdc->irq < 0) | |
65 | return hlcdc->irq; | |
66 | ||
67 | hlcdc->periph_clk = devm_clk_get(dev, "periph_clk"); | |
68 | if (IS_ERR(hlcdc->periph_clk)) { | |
69 | dev_err(dev, "failed to get peripheral clock\n"); | |
70 | return PTR_ERR(hlcdc->periph_clk); | |
71 | } | |
72 | ||
73 | hlcdc->sys_clk = devm_clk_get(dev, "sys_clk"); | |
74 | if (IS_ERR(hlcdc->sys_clk)) { | |
75 | dev_err(dev, "failed to get system clock\n"); | |
76 | return PTR_ERR(hlcdc->sys_clk); | |
77 | } | |
78 | ||
79 | hlcdc->slow_clk = devm_clk_get(dev, "slow_clk"); | |
80 | if (IS_ERR(hlcdc->slow_clk)) { | |
81 | dev_err(dev, "failed to get slow clock\n"); | |
82 | return PTR_ERR(hlcdc->slow_clk); | |
83 | } | |
84 | ||
85 | hlcdc->regmap = devm_regmap_init_mmio(dev, regs, | |
86 | &atmel_hlcdc_regmap_config); | |
87 | if (IS_ERR(hlcdc->regmap)) | |
88 | return PTR_ERR(hlcdc->regmap); | |
89 | ||
90 | dev_set_drvdata(dev, hlcdc); | |
91 | ||
92 | return mfd_add_devices(dev, -1, atmel_hlcdc_cells, | |
93 | ARRAY_SIZE(atmel_hlcdc_cells), | |
94 | NULL, 0, NULL); | |
95 | } | |
96 | ||
97 | static int atmel_hlcdc_remove(struct platform_device *pdev) | |
98 | { | |
99 | mfd_remove_devices(&pdev->dev); | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | static const struct of_device_id atmel_hlcdc_match[] = { | |
105 | { .compatible = "atmel,sama5d3-hlcdc" }, | |
106 | { /* sentinel */ }, | |
107 | }; | |
108 | ||
109 | static struct platform_driver atmel_hlcdc_driver = { | |
110 | .probe = atmel_hlcdc_probe, | |
111 | .remove = atmel_hlcdc_remove, | |
112 | .driver = { | |
113 | .name = "atmel-hlcdc", | |
114 | .of_match_table = atmel_hlcdc_match, | |
115 | }, | |
116 | }; | |
117 | module_platform_driver(atmel_hlcdc_driver); | |
118 | ||
119 | MODULE_ALIAS("platform:atmel-hlcdc"); | |
120 | MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); | |
121 | MODULE_DESCRIPTION("Atmel HLCDC driver"); | |
122 | MODULE_LICENSE("GPL v2"); |