Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / drivers / mfd / atmel-hlcdc.c
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");