[linux-2.6-block.git] / drivers / mfd / atmel-hlcdc.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2014 Free Electrons
 * Copyright (C) 2014 Atmel
 *
 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
 */

#include <linux/clk.h>
#include <linux/iopoll.h>
#include <linux/mfd/atmel-hlcdc.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

#define ATMEL_HLCDC_REG_MAX		(0x4000 - 0x4)

struct atmel_hlcdc_regmap {
	void __iomem *regs;
};

static const struct mfd_cell atmel_hlcdc_cells[] = {
	{
		.name = "atmel-hlcdc-pwm",
		.of_compatible = "atmel,hlcdc-pwm",
	},
	{
		.name = "atmel-hlcdc-dc",
		.of_compatible = "atmel,hlcdc-display-controller",
	},
};

static int regmap_atmel_hlcdc_reg_write(void *context, unsigned int reg,
					unsigned int val)
{
	struct atmel_hlcdc_regmap *hregmap = context;

	if (reg <= ATMEL_HLCDC_DIS) {
		u32 status;

		readl_poll_timeout_atomic(hregmap->regs + ATMEL_HLCDC_SR,
					  status, !(status & ATMEL_HLCDC_SIP),
					  1, 100);
	}

	writel(val, hregmap->regs + reg);

	return 0;
}

static int regmap_atmel_hlcdc_reg_read(void *context, unsigned int reg,
				       unsigned int *val)
{
	struct atmel_hlcdc_regmap *hregmap = context;

	*val = readl(hregmap->regs + reg);

	return 0;
}

static const struct regmap_config atmel_hlcdc_regmap_config = {
	.reg_bits = 32,
	.val_bits = 32,
	.reg_stride = 4,
	.max_register = ATMEL_HLCDC_REG_MAX,
	.reg_write = regmap_atmel_hlcdc_reg_write,
	.reg_read = regmap_atmel_hlcdc_reg_read,
	.fast_io = true,
};

static int atmel_hlcdc_probe(struct platform_device *pdev)
{
	struct atmel_hlcdc_regmap *hregmap;
	struct device *dev = &pdev->dev;
	struct atmel_hlcdc *hlcdc;
	struct resource *res;

	hregmap = devm_kzalloc(dev, sizeof(*hregmap), GFP_KERNEL);
	if (!hregmap)
		return -ENOMEM;

	hlcdc = devm_kzalloc(dev, sizeof(*hlcdc), GFP_KERNEL);
	if (!hlcdc)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	hregmap->regs = devm_ioremap_resource(dev, res);
	if (IS_ERR(hregmap->regs))
		return PTR_ERR(hregmap->regs);

	hlcdc->irq = platform_get_irq(pdev, 0);
	if (hlcdc->irq < 0)
		return hlcdc->irq;

	hlcdc->periph_clk = devm_clk_get(dev, "periph_clk");
	if (IS_ERR(hlcdc->periph_clk)) {
		dev_err(dev, "failed to get peripheral clock\n");
		return PTR_ERR(hlcdc->periph_clk);
	}

	hlcdc->sys_clk = devm_clk_get(dev, "sys_clk");
	if (IS_ERR(hlcdc->sys_clk)) {
		dev_err(dev, "failed to get system clock\n");
		return PTR_ERR(hlcdc->sys_clk);
	}

	hlcdc->slow_clk = devm_clk_get(dev, "slow_clk");
	if (IS_ERR(hlcdc->slow_clk)) {
		dev_err(dev, "failed to get slow clock\n");
		return PTR_ERR(hlcdc->slow_clk);
	}

	hlcdc->regmap = devm_regmap_init(dev, NULL, hregmap,
					 &atmel_hlcdc_regmap_config);
	if (IS_ERR(hlcdc->regmap))
		return PTR_ERR(hlcdc->regmap);

	dev_set_drvdata(dev, hlcdc);

	return devm_mfd_add_devices(dev, -1, atmel_hlcdc_cells,
				    ARRAY_SIZE(atmel_hlcdc_cells),
				    NULL, 0, NULL);
}

static const struct of_device_id atmel_hlcdc_match[] = {
	{ .compatible = "atmel,at91sam9n12-hlcdc" },
	{ .compatible = "atmel,at91sam9x5-hlcdc" },
	{ .compatible = "atmel,sama5d2-hlcdc" },
	{ .compatible = "atmel,sama5d3-hlcdc" },
	{ .compatible = "atmel,sama5d4-hlcdc" },
	{ .compatible = "microchip,sam9x60-hlcdc" },
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, atmel_hlcdc_match);

static struct platform_driver atmel_hlcdc_driver = {
	.probe = atmel_hlcdc_probe,
	.driver = {
		.name = "atmel-hlcdc",
		.of_match_table = atmel_hlcdc_match,
	},
};
module_platform_driver(atmel_hlcdc_driver);

MODULE_ALIAS("platform:atmel-hlcdc");
MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
MODULE_DESCRIPTION("Atmel HLCDC driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
caab277b	1	// SPDX-License-Identifier: GPL-2.0-only
2c86e9fb BB	2	/*
	3	* Copyright (C) 2014 Free Electrons
	4	* Copyright (C) 2014 Atmel
	5	*
	6	* Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
2c86e9fb BB	7	*/
	8
	9	#include <linux/clk.h>
ea31c0cf	10	#include <linux/iopoll.h>
2c86e9fb BB	11	#include <linux/mfd/atmel-hlcdc.h>
	12	#include <linux/mfd/core.h>
	13	#include <linux/module.h>
ac316725	14	#include <linux/mod_devicetable.h>
2c86e9fb BB	15	#include <linux/platform_device.h>
	16	#include <linux/regmap.h>
	17
	18	#define ATMEL_HLCDC_REG_MAX (0x4000 - 0x4)
	19
ea31c0cf BB	20	struct atmel_hlcdc_regmap {
	21	void __iomem *regs;
	22	};
	23
2c86e9fb BB	24	static 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
ea31c0cf BB	35	static 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
2c2469bc BB	43	readl_poll_timeout_atomic(hregmap->regs + ATMEL_HLCDC_SR,
	44	status, !(status & ATMEL_HLCDC_SIP),
	45	1, 100);
ea31c0cf BB	46	}
	47
	48	writel(val, hregmap->regs + reg);
	49
	50	return 0;
	51	}
	52
	53	static 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
2c86e9fb BB	63	static 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,
ea31c0cf BB	68	.reg_write = regmap_atmel_hlcdc_reg_write,
	69	.reg_read = regmap_atmel_hlcdc_reg_read,
	70	.fast_io = true,
2c86e9fb BB	71	};
	72
	73	static int atmel_hlcdc_probe(struct platform_device *pdev)
	74	{
ea31c0cf	75	struct atmel_hlcdc_regmap *hregmap;
2c86e9fb BB	76	struct device *dev = &pdev->dev;
	77	struct atmel_hlcdc *hlcdc;
	78	struct resource *res;
ea31c0cf BB	79
	80	hregmap = devm_kzalloc(dev, sizeof(*hregmap), GFP_KERNEL);
	81	if (!hregmap)
	82	return -ENOMEM;
2c86e9fb BB	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);
ea31c0cf BB	89	hregmap->regs = devm_ioremap_resource(dev, res);
	90	if (IS_ERR(hregmap->regs))
	91	return PTR_ERR(hregmap->regs);
2c86e9fb BB	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
ea31c0cf BB	115	hlcdc->regmap = devm_regmap_init(dev, NULL, hregmap,
ea31c0cf BB	116	&atmel_hlcdc_regmap_config);
2c86e9fb BB	117	if (IS_ERR(hlcdc->regmap))
	118	return PTR_ERR(hlcdc->regmap);
	119
	120	dev_set_drvdata(dev, hlcdc);
	121
f32fb9a5 LD	122	return devm_mfd_add_devices(dev, -1, atmel_hlcdc_cells,
	123	ARRAY_SIZE(atmel_hlcdc_cells),
	124	NULL, 0, NULL);
2c86e9fb BB	125	}
	126
	127	static const struct of_device_id atmel_hlcdc_match[] = {
d9c93f5d BB	128	{ .compatible = "atmel,at91sam9n12-hlcdc" },
	129	{ .compatible = "atmel,at91sam9x5-hlcdc" },
	130	{ .compatible = "atmel,sama5d2-hlcdc" },
2c86e9fb	131	{ .compatible = "atmel,sama5d3-hlcdc" },
d9c93f5d	132	{ .compatible = "atmel,sama5d4-hlcdc" },
1e8c1585	133	{ .compatible = "microchip,sam9x60-hlcdc" },
2c86e9fb BB	134	{ /* sentinel */ },
2c86e9fb BB	135	};
a0aef1f5	136	MODULE_DEVICE_TABLE(of, atmel_hlcdc_match);
2c86e9fb BB	137
	138	static struct platform_driver atmel_hlcdc_driver = {
	139	.probe = atmel_hlcdc_probe,
2c86e9fb BB	140	.driver = {
	141	.name = "atmel-hlcdc",
	142	.of_match_table = atmel_hlcdc_match,
	143	},
	144	};
	145	module_platform_driver(atmel_hlcdc_driver);
	146
	147	MODULE_ALIAS("platform:atmel-hlcdc");
	148	MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
	149	MODULE_DESCRIPTION("Atmel HLCDC driver");
	150	MODULE_LICENSE("GPL v2");