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	struct resource *res;
 87
 88	hregmap = devm_kzalloc(dev, sizeof(*hregmap), GFP_KERNEL);
 89	if (!hregmap)
 90		return -ENOMEM;
 91
 92	hlcdc = devm_kzalloc(dev, sizeof(*hlcdc), GFP_KERNEL);
 93	if (!hlcdc)
 94		return -ENOMEM;
 95
 96	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 97	hregmap->regs = devm_ioremap_resource(dev, res);
 98	if (IS_ERR(hregmap->regs))
 99		return PTR_ERR(hregmap->regs);
100
101	hregmap->dev = &pdev->dev;
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 devm_mfd_add_devices(dev, -1, atmel_hlcdc_cells,
133				    ARRAY_SIZE(atmel_hlcdc_cells),
134				    NULL, 0, NULL);
135}
136
137static const struct of_device_id atmel_hlcdc_match[] = {
138	{ .compatible = "atmel,at91sam9n12-hlcdc" },
139	{ .compatible = "atmel,at91sam9x5-hlcdc" },
140	{ .compatible = "atmel,sama5d2-hlcdc" },
141	{ .compatible = "atmel,sama5d3-hlcdc" },
142	{ .compatible = "atmel,sama5d4-hlcdc" },
143	{ .compatible = "microchip,sam9x60-hlcdc" },
144	{ /* sentinel */ },
145};
146MODULE_DEVICE_TABLE(of, atmel_hlcdc_match);
147
148static struct platform_driver atmel_hlcdc_driver = {
149	.probe = atmel_hlcdc_probe,
150	.driver = {
151		.name = "atmel-hlcdc",
152		.of_match_table = atmel_hlcdc_match,
153	},
154};
155module_platform_driver(atmel_hlcdc_driver);
156
157MODULE_ALIAS("platform:atmel-hlcdc");
158MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
159MODULE_DESCRIPTION("Atmel HLCDC driver");
160MODULE_LICENSE("GPL v2");