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(hregmap->regs + ATMEL_HLCDC_SR, status,
54				   !(status & ATMEL_HLCDC_SIP), 1, 100);
55	}
56
57	writel(val, hregmap->regs + reg);
58
59	return 0;
60}
61
62static int regmap_atmel_hlcdc_reg_read(void *context, unsigned int reg,
63				       unsigned int *val)
64{
65	struct atmel_hlcdc_regmap *hregmap = context;
66
67	*val = readl(hregmap->regs + reg);
68
69	return 0;
70}
71
72static const struct regmap_config atmel_hlcdc_regmap_config = {
73	.reg_bits = 32,
74	.val_bits = 32,
75	.reg_stride = 4,
76	.max_register = ATMEL_HLCDC_REG_MAX,
77	.reg_write = regmap_atmel_hlcdc_reg_write,
78	.reg_read = regmap_atmel_hlcdc_reg_read,
79	.fast_io = true,
80};
81
82static int atmel_hlcdc_probe(struct platform_device *pdev)
83{
84	struct atmel_hlcdc_regmap *hregmap;
85	struct device *dev = &pdev->dev;
86	struct atmel_hlcdc *hlcdc;
87	struct resource *res;
88
89	hregmap = devm_kzalloc(dev, sizeof(*hregmap), GFP_KERNEL);
90	if (!hregmap)
91		return -ENOMEM;
92
93	hlcdc = devm_kzalloc(dev, sizeof(*hlcdc), GFP_KERNEL);
94	if (!hlcdc)
95		return -ENOMEM;
96
97	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
98	hregmap->regs = devm_ioremap_resource(dev, res);
99	if (IS_ERR(hregmap->regs))
100		return PTR_ERR(hregmap->regs);
101
102	hlcdc->irq = platform_get_irq(pdev, 0);
103	if (hlcdc->irq < 0)
104		return hlcdc->irq;
105
106	hlcdc->periph_clk = devm_clk_get(dev, "periph_clk");
107	if (IS_ERR(hlcdc->periph_clk)) {
108		dev_err(dev, "failed to get peripheral clock\n");
109		return PTR_ERR(hlcdc->periph_clk);
110	}
111
112	hlcdc->sys_clk = devm_clk_get(dev, "sys_clk");
113	if (IS_ERR(hlcdc->sys_clk)) {
114		dev_err(dev, "failed to get system clock\n");
115		return PTR_ERR(hlcdc->sys_clk);
116	}
117
118	hlcdc->slow_clk = devm_clk_get(dev, "slow_clk");
119	if (IS_ERR(hlcdc->slow_clk)) {
120		dev_err(dev, "failed to get slow clock\n");
121		return PTR_ERR(hlcdc->slow_clk);
122	}
123
124	hlcdc->regmap = devm_regmap_init(dev, NULL, hregmap,
125					 &atmel_hlcdc_regmap_config);
126	if (IS_ERR(hlcdc->regmap))
127		return PTR_ERR(hlcdc->regmap);
128
129	dev_set_drvdata(dev, hlcdc);
130
131	return mfd_add_devices(dev, -1, atmel_hlcdc_cells,
132			       ARRAY_SIZE(atmel_hlcdc_cells),
133			       NULL, 0, NULL);
134}
135
136static int atmel_hlcdc_remove(struct platform_device *pdev)
137{
138	mfd_remove_devices(&pdev->dev);
139
140	return 0;
141}
142
143static const struct of_device_id atmel_hlcdc_match[] = {
144	{ .compatible = "atmel,at91sam9n12-hlcdc" },
145	{ .compatible = "atmel,at91sam9x5-hlcdc" },
146	{ .compatible = "atmel,sama5d2-hlcdc" },
147	{ .compatible = "atmel,sama5d3-hlcdc" },
148	{ .compatible = "atmel,sama5d4-hlcdc" },
149	{ /* sentinel */ },
150};
151MODULE_DEVICE_TABLE(of, atmel_hlcdc_match);
152
153static struct platform_driver atmel_hlcdc_driver = {
154	.probe = atmel_hlcdc_probe,
155	.remove = atmel_hlcdc_remove,
156	.driver = {
157		.name = "atmel-hlcdc",
158		.of_match_table = atmel_hlcdc_match,
159	},
160};
161module_platform_driver(atmel_hlcdc_driver);
162
163MODULE_ALIAS("platform:atmel-hlcdc");
164MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
165MODULE_DESCRIPTION("Atmel HLCDC driver");
166MODULE_LICENSE("GPL v2");
167