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};
 23
 24static const struct mfd_cell atmel_hlcdc_cells[] = {
 25	{
 26		.name = "atmel-hlcdc-pwm",
 27		.of_compatible = "atmel,hlcdc-pwm",
 28	},
 29	{
 30		.name = "atmel-hlcdc-dc",
 31		.of_compatible = "atmel,hlcdc-display-controller",
 32	},
 33};
 34
 35static int regmap_atmel_hlcdc_reg_write(void *context, unsigned int reg,
 36					unsigned int val)
 37{
 38	struct atmel_hlcdc_regmap *hregmap = context;
 39
 40	if (reg <= ATMEL_HLCDC_DIS) {
 41		u32 status;
 42
 43		readl_poll_timeout_atomic(hregmap->regs + ATMEL_HLCDC_SR,
 44					  status, !(status & ATMEL_HLCDC_SIP),
 45					  1, 100);
 46	}
 47
 48	writel(val, hregmap->regs + reg);
 49
 50	return 0;
 51}
 52
 53static int regmap_atmel_hlcdc_reg_read(void *context, unsigned int reg,
 54				       unsigned int *val)
 55{
 56	struct atmel_hlcdc_regmap *hregmap = context;
 57
 58	*val = readl(hregmap->regs + reg);
 59
 60	return 0;
 61}
 62
 63static const struct regmap_config atmel_hlcdc_regmap_config = {
 64	.reg_bits = 32,
 65	.val_bits = 32,
 66	.reg_stride = 4,
 67	.max_register = ATMEL_HLCDC_REG_MAX,
 68	.reg_write = regmap_atmel_hlcdc_reg_write,
 69	.reg_read = regmap_atmel_hlcdc_reg_read,
 70	.fast_io = true,
 71};
 72
 73static int atmel_hlcdc_probe(struct platform_device *pdev)
 74{
 75	struct atmel_hlcdc_regmap *hregmap;
 76	struct device *dev = &pdev->dev;
 77	struct atmel_hlcdc *hlcdc;
 78	struct resource *res;
 79
 80	hregmap = devm_kzalloc(dev, sizeof(*hregmap), GFP_KERNEL);
 81	if (!hregmap)
 82		return -ENOMEM;
 83
 84	hlcdc = devm_kzalloc(dev, sizeof(*hlcdc), GFP_KERNEL);
 85	if (!hlcdc)
 86		return -ENOMEM;
 87
 88	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 89	hregmap->regs = devm_ioremap_resource(dev, res);
 90	if (IS_ERR(hregmap->regs))
 91		return PTR_ERR(hregmap->regs);
 92
 93	hlcdc->irq = platform_get_irq(pdev, 0);
 94	if (hlcdc->irq < 0)
 95		return hlcdc->irq;
 96
 97	hlcdc->periph_clk = devm_clk_get(dev, "periph_clk");
 98	if (IS_ERR(hlcdc->periph_clk)) {
 99		dev_err(dev, "failed to get peripheral clock\n");
100		return PTR_ERR(hlcdc->periph_clk);
101	}
102
103	hlcdc->sys_clk = devm_clk_get(dev, "sys_clk");
104	if (IS_ERR(hlcdc->sys_clk)) {
105		dev_err(dev, "failed to get system clock\n");
106		return PTR_ERR(hlcdc->sys_clk);
107	}
108
109	hlcdc->slow_clk = devm_clk_get(dev, "slow_clk");
110	if (IS_ERR(hlcdc->slow_clk)) {
111		dev_err(dev, "failed to get slow clock\n");
112		return PTR_ERR(hlcdc->slow_clk);
113	}
114
115	hlcdc->regmap = devm_regmap_init(dev, NULL, hregmap,
116					 &atmel_hlcdc_regmap_config);
117	if (IS_ERR(hlcdc->regmap))
118		return PTR_ERR(hlcdc->regmap);
119
120	dev_set_drvdata(dev, hlcdc);
121
122	return devm_mfd_add_devices(dev, -1, atmel_hlcdc_cells,
123				    ARRAY_SIZE(atmel_hlcdc_cells),
124				    NULL, 0, NULL);
125}
126
127static const struct of_device_id atmel_hlcdc_match[] = {
128	{ .compatible = "atmel,at91sam9n12-hlcdc" },
129	{ .compatible = "atmel,at91sam9x5-hlcdc" },
130	{ .compatible = "atmel,sama5d2-hlcdc" },
131	{ .compatible = "atmel,sama5d3-hlcdc" },
132	{ .compatible = "atmel,sama5d4-hlcdc" },
133	{ .compatible = "microchip,sam9x60-hlcdc" },
134	{ /* sentinel */ },
135};
136MODULE_DEVICE_TABLE(of, atmel_hlcdc_match);
137
138static struct platform_driver atmel_hlcdc_driver = {
139	.probe = atmel_hlcdc_probe,
140	.driver = {
141		.name = "atmel-hlcdc",
142		.of_match_table = atmel_hlcdc_match,
143	},
144};
145module_platform_driver(atmel_hlcdc_driver);
146
147MODULE_ALIAS("platform:atmel-hlcdc");
148MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
149MODULE_DESCRIPTION("Atmel HLCDC driver");
150MODULE_LICENSE("GPL v2");