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
20struct atmel_hlcdc_regmap {
21	void __iomem *regs;
22	struct device *dev;
23};
24
25static 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
36static 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
61static 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
71static 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
81static 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
87	hregmap = devm_kzalloc(dev, sizeof(*hregmap), GFP_KERNEL);
88	if (!hregmap)
89		return -ENOMEM;
90
91	hlcdc = devm_kzalloc(dev, sizeof(*hlcdc), GFP_KERNEL);
92	if (!hlcdc)
93		return -ENOMEM;
94
95	hregmap->regs = devm_platform_ioremap_resource(pdev, 0);
96	if (IS_ERR(hregmap->regs))
97		return PTR_ERR(hregmap->regs);
98
99	hregmap->dev = &pdev->dev;
100
101	hlcdc->irq = platform_get_irq(pdev, 0);
102	if (hlcdc->irq < 0)
103		return hlcdc->irq;
104
105	hlcdc->periph_clk = devm_clk_get(dev, "periph_clk");
106	if (IS_ERR(hlcdc->periph_clk)) {
107		dev_err(dev, "failed to get peripheral clock\n");
108		return PTR_ERR(hlcdc->periph_clk);
109	}
110
111	hlcdc->sys_clk = devm_clk_get(dev, "sys_clk");
112	if (IS_ERR(hlcdc->sys_clk)) {
113		dev_err(dev, "failed to get system clock\n");
114		return PTR_ERR(hlcdc->sys_clk);
115	}
116
117	hlcdc->slow_clk = devm_clk_get(dev, "slow_clk");
118	if (IS_ERR(hlcdc->slow_clk)) {
119		dev_err(dev, "failed to get slow clock\n");
120		return PTR_ERR(hlcdc->slow_clk);
121	}
122
123	hlcdc->regmap = devm_regmap_init(dev, NULL, hregmap,
124					 &atmel_hlcdc_regmap_config);
125	if (IS_ERR(hlcdc->regmap))
126		return PTR_ERR(hlcdc->regmap);
127
128	dev_set_drvdata(dev, hlcdc);
129
130	return devm_mfd_add_devices(dev, -1, atmel_hlcdc_cells,
131				    ARRAY_SIZE(atmel_hlcdc_cells),
132				    NULL, 0, NULL);
133}
134
135static const struct of_device_id atmel_hlcdc_match[] = {
136	{ .compatible = "atmel,at91sam9n12-hlcdc" },
137	{ .compatible = "atmel,at91sam9x5-hlcdc" },
138	{ .compatible = "atmel,sama5d2-hlcdc" },
139	{ .compatible = "atmel,sama5d3-hlcdc" },
140	{ .compatible = "atmel,sama5d4-hlcdc" },
141	{ .compatible = "microchip,sam9x60-hlcdc" },
142	{ .compatible = "microchip,sam9x75-xlcdc" },
143	{ /* sentinel */ },
144};
145MODULE_DEVICE_TABLE(of, atmel_hlcdc_match);
146
147static struct platform_driver atmel_hlcdc_driver = {
148	.probe = atmel_hlcdc_probe,
149	.driver = {
150		.name = "atmel-hlcdc",
151		.of_match_table = atmel_hlcdc_match,
152	},
153};
154module_platform_driver(atmel_hlcdc_driver);
155
156MODULE_ALIAS("platform:atmel-hlcdc");
157MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
158MODULE_DESCRIPTION("Atmel HLCDC driver");
159MODULE_LICENSE("GPL v2");
160