[deliverable/linux.git] / drivers / mmc / host / dw_mmc-k3.c

/*
 * Copyright (c) 2013 Linaro Ltd.
 * Copyright (c) 2013 Hisilicon Limited.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/clk.h>
#include <linux/mfd/syscon.h>
#include <linux/mmc/host.h>
#include <linux/mmc/dw_mmc.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>

#include "dw_mmc.h"
#include "dw_mmc-pltfm.h"

/*
 * hi6220 sd only support io voltage 1.8v and 3v
 * Also need config AO_SCTRL_SEL18 accordingly
 */
#define AO_SCTRL_SEL18		BIT(10)
#define AO_SCTRL_CTRL3		0x40C

struct k3_priv {
	struct regmap	*reg;
};

static void dw_mci_k3_set_ios(struct dw_mci *host, struct mmc_ios *ios)
{
	int ret;

	ret = clk_set_rate(host->ciu_clk, ios->clock);
	if (ret)
		dev_warn(host->dev, "failed to set rate %uHz\n", ios->clock);

	host->bus_hz = clk_get_rate(host->ciu_clk);
}

static const struct dw_mci_drv_data k3_drv_data = {
	.set_ios		= dw_mci_k3_set_ios,
};

static int dw_mci_hi6220_parse_dt(struct dw_mci *host)
{
	struct k3_priv *priv;

	priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->reg = syscon_regmap_lookup_by_phandle(host->dev->of_node,
					 "hisilicon,peripheral-syscon");
	if (IS_ERR(priv->reg))
		priv->reg = NULL;

	host->priv = priv;
	return 0;
}

static int dw_mci_hi6220_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
{
	struct dw_mci_slot *slot = mmc_priv(mmc);
	struct k3_priv *priv;
	struct dw_mci *host;
	int min_uv, max_uv;
	int ret;

	host = slot->host;
	priv = host->priv;

	if (!priv || !priv->reg)
		return 0;

	if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
		ret = regmap_update_bits(priv->reg, AO_SCTRL_CTRL3,
					 AO_SCTRL_SEL18, 0);
		min_uv = 3000000;
		max_uv = 3000000;
	} else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
		ret = regmap_update_bits(priv->reg, AO_SCTRL_CTRL3,
					 AO_SCTRL_SEL18, AO_SCTRL_SEL18);
		min_uv = 1800000;
		max_uv = 1800000;
	} else {
		dev_dbg(host->dev, "voltage not supported\n");
		return -EINVAL;
	}

	if (ret) {
		dev_dbg(host->dev, "switch voltage failed\n");
		return ret;
	}

	if (IS_ERR_OR_NULL(mmc->supply.vqmmc))
		return 0;

	ret = regulator_set_voltage(mmc->supply.vqmmc, min_uv, max_uv);
	if (ret) {
		dev_dbg(host->dev, "Regulator set error %d: %d - %d\n",
				 ret, min_uv, max_uv);
		return ret;
	}

	return 0;
}

static void dw_mci_hi6220_set_ios(struct dw_mci *host, struct mmc_ios *ios)
{
	int ret;
	unsigned int clock;

	clock = (ios->clock <= 25000000) ? 25000000 : ios->clock;

	ret = clk_set_rate(host->biu_clk, clock);
	if (ret)
		dev_warn(host->dev, "failed to set rate %uHz\n", clock);

	host->bus_hz = clk_get_rate(host->biu_clk);
}

static const struct dw_mci_drv_data hi6220_data = {
	.switch_voltage		= dw_mci_hi6220_switch_voltage,
	.set_ios		= dw_mci_hi6220_set_ios,
	.parse_dt		= dw_mci_hi6220_parse_dt,
};

static const struct of_device_id dw_mci_k3_match[] = {
	{ .compatible = "hisilicon,hi4511-dw-mshc", .data = &k3_drv_data, },
	{ .compatible = "hisilicon,hi6220-dw-mshc", .data = &hi6220_data, },
	{},
};
MODULE_DEVICE_TABLE(of, dw_mci_k3_match);

static int dw_mci_k3_probe(struct platform_device *pdev)
{
	const struct dw_mci_drv_data *drv_data;
	const struct of_device_id *match;

	match = of_match_node(dw_mci_k3_match, pdev->dev.of_node);
	drv_data = match->data;

	return dw_mci_pltfm_register(pdev, drv_data);
}

#ifdef CONFIG_PM_SLEEP
static int dw_mci_k3_suspend(struct device *dev)
{
	struct dw_mci *host = dev_get_drvdata(dev);
	int ret;

	ret = dw_mci_suspend(host);
	if (!ret)
		clk_disable_unprepare(host->ciu_clk);

	return ret;
}

static int dw_mci_k3_resume(struct device *dev)
{
	struct dw_mci *host = dev_get_drvdata(dev);
	int ret;

	ret = clk_prepare_enable(host->ciu_clk);
	if (ret) {
		dev_err(host->dev, "failed to enable ciu clock\n");
		return ret;
	}

	return dw_mci_resume(host);
}
#endif /* CONFIG_PM_SLEEP */

static SIMPLE_DEV_PM_OPS(dw_mci_k3_pmops, dw_mci_k3_suspend, dw_mci_k3_resume);

static struct platform_driver dw_mci_k3_pltfm_driver = {
	.probe		= dw_mci_k3_probe,
	.remove		= dw_mci_pltfm_remove,
	.driver		= {
		.name		= "dwmmc_k3",
		.of_match_table	= dw_mci_k3_match,
		.pm		= &dw_mci_k3_pmops,
	},
};

module_platform_driver(dw_mci_k3_pltfm_driver);

MODULE_DESCRIPTION("K3 Specific DW-MSHC Driver Extension");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:dwmmc_k3");
Commit	Line	Data
036f29d5 ZG	1	/*
	2	* Copyright (c) 2013 Linaro Ltd.
	3	* Copyright (c) 2013 Hisilicon Limited.
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*/
	10
036f29d5	11	#include <linux/clk.h>
0293efdd	12	#include <linux/mfd/syscon.h>
036f29d5 ZG	13	#include <linux/mmc/host.h>
036f29d5 ZG	14	#include <linux/mmc/dw_mmc.h>
0293efdd	15	#include <linux/module.h>
036f29d5	16	#include <linux/of_address.h>
0293efdd ZG	17	#include <linux/platform_device.h>
	18	#include <linux/regmap.h>
	19	#include <linux/regulator/consumer.h>
036f29d5 ZG	20
	21	#include "dw_mmc.h"
	22	#include "dw_mmc-pltfm.h"
	23
0293efdd ZG	24	/*
	25	* hi6220 sd only support io voltage 1.8v and 3v
	26	* Also need config AO_SCTRL_SEL18 accordingly
	27	*/
	28	#define AO_SCTRL_SEL18 BIT(10)
	29	#define AO_SCTRL_CTRL3 0x40C
	30
	31	struct k3_priv {
	32	struct regmap *reg;
	33	};
	34
036f29d5 ZG	35	static void dw_mci_k3_set_ios(struct dw_mci host, struct mmc_ios ios)
036f29d5 ZG	36	{
036f29d5 ZG	37	int ret;
036f29d5 ZG	38
0e662440	39	ret = clk_set_rate(host->ciu_clk, ios->clock);
036f29d5	40	if (ret)
0e662440	41	dev_warn(host->dev, "failed to set rate %uHz\n", ios->clock);
036f29d5 ZG	42
	43	host->bus_hz = clk_get_rate(host->ciu_clk);
	44	}
	45
036f29d5 ZG	46	static const struct dw_mci_drv_data k3_drv_data = {
036f29d5 ZG	47	.set_ios = dw_mci_k3_set_ios,
036f29d5 ZG	48	};
036f29d5 ZG	49
0293efdd ZG	50	static int dw_mci_hi6220_parse_dt(struct dw_mci *host)
	51	{
	52	struct k3_priv *priv;
	53
	54	priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
	55	if (!priv)
	56	return -ENOMEM;
	57
	58	priv->reg = syscon_regmap_lookup_by_phandle(host->dev->of_node,
	59	"hisilicon,peripheral-syscon");
	60	if (IS_ERR(priv->reg))
	61	priv->reg = NULL;
	62
	63	host->priv = priv;
	64	return 0;
	65	}
	66
	67	static int dw_mci_hi6220_switch_voltage(struct mmc_host mmc, struct mmc_ios ios)
	68	{
	69	struct dw_mci_slot *slot = mmc_priv(mmc);
	70	struct k3_priv *priv;
	71	struct dw_mci *host;
	72	int min_uv, max_uv;
	73	int ret;
	74
	75	host = slot->host;
	76	priv = host->priv;
	77
	78	if (!priv \|\| !priv->reg)
	79	return 0;
	80
	81	if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
	82	ret = regmap_update_bits(priv->reg, AO_SCTRL_CTRL3,
	83	AO_SCTRL_SEL18, 0);
	84	min_uv = 3000000;
	85	max_uv = 3000000;
	86	} else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
	87	ret = regmap_update_bits(priv->reg, AO_SCTRL_CTRL3,
	88	AO_SCTRL_SEL18, AO_SCTRL_SEL18);
	89	min_uv = 1800000;
	90	max_uv = 1800000;
	91	} else {
	92	dev_dbg(host->dev, "voltage not supported\n");
	93	return -EINVAL;
	94	}
	95
	96	if (ret) {
	97	dev_dbg(host->dev, "switch voltage failed\n");
	98	return ret;
	99	}
	100
	101	if (IS_ERR_OR_NULL(mmc->supply.vqmmc))
	102	return 0;
	103
	104	ret = regulator_set_voltage(mmc->supply.vqmmc, min_uv, max_uv);
	105	if (ret) {
	106	dev_dbg(host->dev, "Regulator set error %d: %d - %d\n",
	107	ret, min_uv, max_uv);
	108	return ret;
	109	}
	110
	111	return 0;
	112	}
	113
114	static void dw_mci_hi6220_set_ios(struct dw_mci host, struct mmc_ios ios)
115	{
116	int ret;
117	unsigned int clock;
118
119	clock = (ios->clock <= 25000000) ? 25000000 : ios->clock;
120
121	ret = clk_set_rate(host->biu_clk, clock);
122	if (ret)
123	dev_warn(host->dev, "failed to set rate %uHz\n", clock);
124
125	host->bus_hz = clk_get_rate(host->biu_clk);
126	}
127
128	static const struct dw_mci_drv_data hi6220_data = {
129	.switch_voltage = dw_mci_hi6220_switch_voltage,
130	.set_ios = dw_mci_hi6220_set_ios,
131	.parse_dt = dw_mci_hi6220_parse_dt,
132	};
133
036f29d5 ZG	134	static const struct of_device_id dw_mci_k3_match[] = {
036f29d5 ZG	135	{ .compatible = "hisilicon,hi4511-dw-mshc", .data = &k3_drv_data, },
0293efdd	136	{ .compatible = "hisilicon,hi6220-dw-mshc", .data = &hi6220_data, },
036f29d5 ZG	137	{},
	138	};
	139	MODULE_DEVICE_TABLE(of, dw_mci_k3_match);
	140
	141	static int dw_mci_k3_probe(struct platform_device *pdev)
	142	{
	143	const struct dw_mci_drv_data *drv_data;
	144	const struct of_device_id *match;
	145
	146	match = of_match_node(dw_mci_k3_match, pdev->dev.of_node);
	147	drv_data = match->data;
	148
	149	return dw_mci_pltfm_register(pdev, drv_data);
	150	}
	151
370aede6	152	#ifdef CONFIG_PM_SLEEP
036f29d5 ZG	153	static int dw_mci_k3_suspend(struct device *dev)
	154	{
	155	struct dw_mci *host = dev_get_drvdata(dev);
	156	int ret;
	157
	158	ret = dw_mci_suspend(host);
	159	if (!ret)
	160	clk_disable_unprepare(host->ciu_clk);
	161
	162	return ret;
	163	}
	164
	165	static int dw_mci_k3_resume(struct device *dev)
	166	{
	167	struct dw_mci *host = dev_get_drvdata(dev);
	168	int ret;
	169
	170	ret = clk_prepare_enable(host->ciu_clk);
	171	if (ret) {
	172	dev_err(host->dev, "failed to enable ciu clock\n");
	173	return ret;
	174	}
	175
	176	return dw_mci_resume(host);
	177	}
370aede6	178	#endif /* CONFIG_PM_SLEEP */
036f29d5	179
85136b74	180	static SIMPLE_DEV_PM_OPS(dw_mci_k3_pmops, dw_mci_k3_suspend, dw_mci_k3_resume);
036f29d5 ZG	181
	182	static struct platform_driver dw_mci_k3_pltfm_driver = {
	183	.probe = dw_mci_k3_probe,
	184	.remove = dw_mci_pltfm_remove,
	185	.driver = {
	186	.name = "dwmmc_k3",
	187	.of_match_table = dw_mci_k3_match,
	188	.pm = &dw_mci_k3_pmops,
	189	},
	190	};
	191
	192	module_platform_driver(dw_mci_k3_pltfm_driver);
	193
	194	MODULE_DESCRIPTION("K3 Specific DW-MSHC Driver Extension");
	195	MODULE_LICENSE("GPL v2");
7026fd66	196	MODULE_ALIAS("platform:dwmmc_k3");