Gitiles
Code Review Sign In
gerrit.nordix.org / codeaurora / cp-linux / 8d8f6542b666daf5e87de156590e635c2c4da0c0 / . / drivers / mfd / atmel-hlcdc.c
blob: c216c3a55793d9044f8c509aa1f097ca46332828 [file] [log] [blame]
Kyle Swenson8d8f6542021-03-15 11:02:55 -0600[diff] [blame^]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/iopoll.h>
22#include <linux/mfd/atmel-hlcdc.h>
23#include <linux/mfd/core.h>
24#include <linux/module.h>
25#include <linux/platform_device.h>
26#include <linux/regmap.h>
27
28#define ATMEL_HLCDC_REG_MAX (0x4000 - 0x4)
29
30struct atmel_hlcdc_regmap {
31 void __iomem *regs;
32};
33
34static const struct mfd_cell atmel_hlcdc_cells[] = {
35 {
36 .name = "atmel-hlcdc-pwm",
37 .of_compatible = "atmel,hlcdc-pwm",
38 },
39 {
40 .name = "atmel-hlcdc-dc",
41 .of_compatible = "atmel,hlcdc-display-controller",
42 },
43};
44
45static int regmap_atmel_hlcdc_reg_write(void *context, unsigned int reg,
46 unsigned int val)
47{
48 struct atmel_hlcdc_regmap *hregmap = context;
49
50 if (reg <= ATMEL_HLCDC_DIS) {
51 u32 status;
52
53 readl_poll_timeout_atomic(hregmap->regs + ATMEL_HLCDC_SR,
54 status, !(status & ATMEL_HLCDC_SIP),
55 1, 100);
56 }
57
58 writel(val, hregmap->regs + reg);
59
60 return 0;
61}
62
63static int regmap_atmel_hlcdc_reg_read(void *context, unsigned int reg,
64 unsigned int *val)
65{
66 struct atmel_hlcdc_regmap *hregmap = context;
67
68 *val = readl(hregmap->regs + reg);
69
70 return 0;
71}
72
73static const struct regmap_config atmel_hlcdc_regmap_config = {
74 .reg_bits = 32,
75 .val_bits = 32,
76 .reg_stride = 4,
77 .max_register = ATMEL_HLCDC_REG_MAX,
78 .reg_write = regmap_atmel_hlcdc_reg_write,
79 .reg_read = regmap_atmel_hlcdc_reg_read,
80 .fast_io = true,
81};
82
83static int atmel_hlcdc_probe(struct platform_device *pdev)
84{
85 struct atmel_hlcdc_regmap *hregmap;
86 struct device *dev = &pdev->dev;
87 struct atmel_hlcdc *hlcdc;
88 struct resource *res;
89
90 hregmap = devm_kzalloc(dev, sizeof(*hregmap), GFP_KERNEL);
91 if (!hregmap)
92 return -ENOMEM;
93
94 hlcdc = devm_kzalloc(dev, sizeof(*hlcdc), GFP_KERNEL);
95 if (!hlcdc)
96 return -ENOMEM;
97
98 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
99 hregmap->regs = devm_ioremap_resource(dev, res);
100 if (IS_ERR(hregmap->regs))
101 return PTR_ERR(hregmap->regs);
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 mfd_add_devices(dev, -1, atmel_hlcdc_cells,
133 ARRAY_SIZE(atmel_hlcdc_cells),
134 NULL, 0, NULL);
135}
136
137static int atmel_hlcdc_remove(struct platform_device *pdev)
138{
139 mfd_remove_devices(&pdev->dev);
140
141 return 0;
142}
143
144static const struct of_device_id atmel_hlcdc_match[] = {
145 { .compatible = "atmel,at91sam9n12-hlcdc" },
146 { .compatible = "atmel,at91sam9x5-hlcdc" },
147 { .compatible = "atmel,sama5d2-hlcdc" },
148 { .compatible = "atmel,sama5d3-hlcdc" },
149 { .compatible = "atmel,sama5d4-hlcdc" },
150 { /* sentinel */ },
151};
152MODULE_DEVICE_TABLE(of, atmel_hlcdc_match);
153
154static struct platform_driver atmel_hlcdc_driver = {
155 .probe = atmel_hlcdc_probe,
156 .remove = atmel_hlcdc_remove,
157 .driver = {
158 .name = "atmel-hlcdc",
159 .of_match_table = atmel_hlcdc_match,
160 },
161};
162module_platform_driver(atmel_hlcdc_driver);
163
164MODULE_ALIAS("platform:atmel-hlcdc");
165MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
166MODULE_DESCRIPTION("Atmel HLCDC driver");
167MODULE_LICENSE("GPL v2");