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

/*
 * Copyright (C) 2014 Free Electrons
 * Copyright (C) 2014 Atmel
 *
 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#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" },
	{ /* 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
2c86e9fb BB	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>
ea31c0cf	21	#include <linux/iopoll.h>
2c86e9fb BB	22	#include <linux/mfd/atmel-hlcdc.h>
	23	#include <linux/mfd/core.h>
	24	#include <linux/module.h>
ac316725	25	#include <linux/mod_devicetable.h>
2c86e9fb BB	26	#include <linux/platform_device.h>
	27	#include <linux/regmap.h>
	28
	29	#define ATMEL_HLCDC_REG_MAX (0x4000 - 0x4)
	30
ea31c0cf BB	31	struct atmel_hlcdc_regmap {
	32	void __iomem *regs;
	33	};
	34
2c86e9fb BB	35	static const struct mfd_cell atmel_hlcdc_cells[] = {
	36	{
	37	.name = "atmel-hlcdc-pwm",
	38	.of_compatible = "atmel,hlcdc-pwm",
	39	},
	40	{
	41	.name = "atmel-hlcdc-dc",
	42	.of_compatible = "atmel,hlcdc-display-controller",
	43	},
	44	};
	45
ea31c0cf BB	46	static int regmap_atmel_hlcdc_reg_write(void *context, unsigned int reg,
	47	unsigned int val)
	48	{
	49	struct atmel_hlcdc_regmap *hregmap = context;
	50
	51	if (reg <= ATMEL_HLCDC_DIS) {
	52	u32 status;
	53
2c2469bc BB	54	readl_poll_timeout_atomic(hregmap->regs + ATMEL_HLCDC_SR,
	55	status, !(status & ATMEL_HLCDC_SIP),
	56	1, 100);
ea31c0cf BB	57	}
	58
	59	writel(val, hregmap->regs + reg);
	60
	61	return 0;
	62	}
	63
	64	static int regmap_atmel_hlcdc_reg_read(void *context, unsigned int reg,
	65	unsigned int *val)
	66	{
	67	struct atmel_hlcdc_regmap *hregmap = context;
	68
	69	*val = readl(hregmap->regs + reg);
	70
	71	return 0;
	72	}
	73
2c86e9fb BB	74	static const struct regmap_config atmel_hlcdc_regmap_config = {
	75	.reg_bits = 32,
	76	.val_bits = 32,
	77	.reg_stride = 4,
	78	.max_register = ATMEL_HLCDC_REG_MAX,
ea31c0cf BB	79	.reg_write = regmap_atmel_hlcdc_reg_write,
	80	.reg_read = regmap_atmel_hlcdc_reg_read,
	81	.fast_io = true,
2c86e9fb BB	82	};
	83
	84	static int atmel_hlcdc_probe(struct platform_device *pdev)
	85	{
ea31c0cf	86	struct atmel_hlcdc_regmap *hregmap;
2c86e9fb BB	87	struct device *dev = &pdev->dev;
	88	struct atmel_hlcdc *hlcdc;
	89	struct resource *res;
ea31c0cf BB	90
	91	hregmap = devm_kzalloc(dev, sizeof(*hregmap), GFP_KERNEL);
	92	if (!hregmap)
	93	return -ENOMEM;
2c86e9fb BB	94
	95	hlcdc = devm_kzalloc(dev, sizeof(*hlcdc), GFP_KERNEL);
	96	if (!hlcdc)
	97	return -ENOMEM;
	98
	99	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
ea31c0cf BB	100	hregmap->regs = devm_ioremap_resource(dev, res);
	101	if (IS_ERR(hregmap->regs))
	102	return PTR_ERR(hregmap->regs);
2c86e9fb BB	103
	104	hlcdc->irq = platform_get_irq(pdev, 0);
	105	if (hlcdc->irq < 0)
	106	return hlcdc->irq;
	107
	108	hlcdc->periph_clk = devm_clk_get(dev, "periph_clk");
	109	if (IS_ERR(hlcdc->periph_clk)) {
	110	dev_err(dev, "failed to get peripheral clock\n");
	111	return PTR_ERR(hlcdc->periph_clk);
	112	}
	113
	114	hlcdc->sys_clk = devm_clk_get(dev, "sys_clk");
	115	if (IS_ERR(hlcdc->sys_clk)) {
	116	dev_err(dev, "failed to get system clock\n");
	117	return PTR_ERR(hlcdc->sys_clk);
	118	}
	119
	120	hlcdc->slow_clk = devm_clk_get(dev, "slow_clk");
	121	if (IS_ERR(hlcdc->slow_clk)) {
	122	dev_err(dev, "failed to get slow clock\n");
	123	return PTR_ERR(hlcdc->slow_clk);
	124	}
	125
ea31c0cf BB	126	hlcdc->regmap = devm_regmap_init(dev, NULL, hregmap,
ea31c0cf BB	127	&atmel_hlcdc_regmap_config);
2c86e9fb BB	128	if (IS_ERR(hlcdc->regmap))
	129	return PTR_ERR(hlcdc->regmap);
	130
	131	dev_set_drvdata(dev, hlcdc);
	132
f32fb9a5 LD	133	return devm_mfd_add_devices(dev, -1, atmel_hlcdc_cells,
	134	ARRAY_SIZE(atmel_hlcdc_cells),
	135	NULL, 0, NULL);
2c86e9fb BB	136	}
	137
	138	static const struct of_device_id atmel_hlcdc_match[] = {
d9c93f5d BB	139	{ .compatible = "atmel,at91sam9n12-hlcdc" },
	140	{ .compatible = "atmel,at91sam9x5-hlcdc" },
	141	{ .compatible = "atmel,sama5d2-hlcdc" },
2c86e9fb	142	{ .compatible = "atmel,sama5d3-hlcdc" },
d9c93f5d	143	{ .compatible = "atmel,sama5d4-hlcdc" },
2c86e9fb BB	144	{ /* sentinel */ },
2c86e9fb BB	145	};
a0aef1f5	146	MODULE_DEVICE_TABLE(of, atmel_hlcdc_match);
2c86e9fb BB	147
	148	static struct platform_driver atmel_hlcdc_driver = {
	149	.probe = atmel_hlcdc_probe,
2c86e9fb BB	150	.driver = {
	151	.name = "atmel-hlcdc",
	152	.of_match_table = atmel_hlcdc_match,
	153	},
	154	};
	155	module_platform_driver(atmel_hlcdc_driver);
	156
	157	MODULE_ALIAS("platform:atmel-hlcdc");
	158	MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
	159	MODULE_DESCRIPTION("Atmel HLCDC driver");
	160	MODULE_LICENSE("GPL v2");