[deliverable/linux.git] / drivers / ata / ahci_st.c

/*
 * Copyright (C) 2012 STMicroelectronics Limited
 *
 * Authors: Francesco Virlinzi <francesco.virlinzi@st.com>
 *	    Alexandre Torgue <alexandre.torgue@st.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.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/export.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/ahci_platform.h>
#include <linux/libata.h>
#include <linux/reset.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>

#include "ahci.h"

#define DRV_NAME  "st_ahci"

#define ST_AHCI_OOBR			0xbc
#define ST_AHCI_OOBR_WE			BIT(31)
#define ST_AHCI_OOBR_CWMIN_SHIFT	24
#define ST_AHCI_OOBR_CWMAX_SHIFT	16
#define ST_AHCI_OOBR_CIMIN_SHIFT	8
#define ST_AHCI_OOBR_CIMAX_SHIFT	0

struct st_ahci_drv_data {
	struct platform_device *ahci;
	struct reset_control *pwr;
	struct reset_control *sw_rst;
	struct reset_control *pwr_rst;
	struct ahci_host_priv *hpriv;
};

static void st_ahci_configure_oob(void __iomem *mmio)
{
	unsigned long old_val, new_val;

	new_val = (0x02 << ST_AHCI_OOBR_CWMIN_SHIFT) |
		  (0x04 << ST_AHCI_OOBR_CWMAX_SHIFT) |
		  (0x08 << ST_AHCI_OOBR_CIMIN_SHIFT) |
		  (0x0C << ST_AHCI_OOBR_CIMAX_SHIFT);

	old_val = readl(mmio + ST_AHCI_OOBR);
	writel(old_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
	writel(new_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
	writel(new_val, mmio + ST_AHCI_OOBR);
}

static int st_ahci_deassert_resets(struct device *dev)
{
	struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
	int err;

	if (drv_data->pwr) {
		err = reset_control_deassert(drv_data->pwr);
		if (err) {
			dev_err(dev, "unable to bring out of pwrdwn\n");
			return err;
		}
	}

	if (drv_data->sw_rst) {
		err = reset_control_deassert(drv_data->sw_rst);
		if (err) {
			dev_err(dev, "unable to bring out of sw-rst\n");
			return err;
		}
	}

	if (drv_data->pwr_rst) {
		err = reset_control_deassert(drv_data->pwr_rst);
		if (err) {
			dev_err(dev, "unable to bring out of pwr-rst\n");
			return err;
		}
	}

	return 0;
}

static void st_ahci_host_stop(struct ata_host *host)
{
	struct ahci_host_priv *hpriv = host->private_data;
	struct device *dev = host->dev;
	struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
	int err;

	if (drv_data->pwr) {
		err = reset_control_assert(drv_data->pwr);
		if (err)
			dev_err(dev, "unable to pwrdwn\n");
	}

	ahci_platform_disable_resources(hpriv);
}

static int st_ahci_probe_resets(struct platform_device *pdev)
{
	struct st_ahci_drv_data *drv_data = platform_get_drvdata(pdev);

	drv_data->pwr = devm_reset_control_get(&pdev->dev, "pwr-dwn");
	if (IS_ERR(drv_data->pwr)) {
		dev_info(&pdev->dev, "power reset control not defined\n");
		drv_data->pwr = NULL;
	}

	drv_data->sw_rst = devm_reset_control_get(&pdev->dev, "sw-rst");
	if (IS_ERR(drv_data->sw_rst)) {
		dev_info(&pdev->dev, "soft reset control not defined\n");
		drv_data->sw_rst = NULL;
	}

	drv_data->pwr_rst = devm_reset_control_get(&pdev->dev, "pwr-rst");
	if (IS_ERR(drv_data->pwr_rst)) {
		dev_dbg(&pdev->dev, "power soft reset control not defined\n");
		drv_data->pwr_rst = NULL;
	}

	return st_ahci_deassert_resets(&pdev->dev);
}

static struct ata_port_operations st_ahci_port_ops = {
	.inherits	= &ahci_platform_ops,
	.host_stop	= st_ahci_host_stop,
};

static const struct ata_port_info st_ahci_port_info = {
	.flags          = AHCI_FLAG_COMMON,
	.pio_mask       = ATA_PIO4,
	.udma_mask      = ATA_UDMA6,
	.port_ops       = &st_ahci_port_ops,
};

static struct scsi_host_template ahci_platform_sht = {
	AHCI_SHT(DRV_NAME),
};

static int st_ahci_probe(struct platform_device *pdev)
{
	struct st_ahci_drv_data *drv_data;
	struct ahci_host_priv *hpriv;
	int err;

	drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
	if (!drv_data)
		return -ENOMEM;

	platform_set_drvdata(pdev, drv_data);

	hpriv = ahci_platform_get_resources(pdev);
	if (IS_ERR(hpriv))
		return PTR_ERR(hpriv);

	drv_data->hpriv = hpriv;

	err = st_ahci_probe_resets(pdev);
	if (err)
		return err;

	err = ahci_platform_enable_resources(hpriv);
	if (err)
		return err;

	st_ahci_configure_oob(drv_data->hpriv->mmio);

	err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info,
				      &ahci_platform_sht);
	if (err) {
		ahci_platform_disable_resources(hpriv);
		return err;
	}

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int st_ahci_suspend(struct device *dev)
{
	struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
	struct ahci_host_priv *hpriv = drv_data->hpriv;
	int err;

	err = ahci_platform_suspend_host(dev);
	if (err)
		return err;

	if (drv_data->pwr) {
		err = reset_control_assert(drv_data->pwr);
		if (err) {
			dev_err(dev, "unable to pwrdwn");
			return err;
		}
	}

	ahci_platform_disable_resources(hpriv);

	return 0;
}

static int st_ahci_resume(struct device *dev)
{
	struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
	struct ahci_host_priv *hpriv = drv_data->hpriv;
	int err;

	err = ahci_platform_enable_resources(hpriv);
	if (err)
		return err;

	err = st_ahci_deassert_resets(dev);
	if (err) {
		ahci_platform_disable_resources(hpriv);
		return err;
	}

	st_ahci_configure_oob(drv_data->hpriv->mmio);

	return ahci_platform_resume_host(dev);
}
#endif

static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);

static const struct of_device_id st_ahci_match[] = {
	{ .compatible = "st,ahci", },
	{},
};
MODULE_DEVICE_TABLE(of, st_ahci_match);

static struct platform_driver st_ahci_driver = {
	.driver = {
		.name = DRV_NAME,
		.pm = &st_ahci_pm_ops,
		.of_match_table = of_match_ptr(st_ahci_match),
	},
	.probe = st_ahci_probe,
	.remove = ata_platform_remove_one,
};
module_platform_driver(st_ahci_driver);

MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");
MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>");
MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
76884cb2 LJ	1	/*
	2	* Copyright (C) 2012 STMicroelectronics Limited
	3	*
	4	* Authors: Francesco Virlinzi <francesco.virlinzi@st.com>
	5	* Alexandre Torgue <alexandre.torgue@st.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
	12	#include <linux/init.h>
	13	#include <linux/module.h>
	14	#include <linux/export.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/clk.h>
	17	#include <linux/of.h>
	18	#include <linux/ahci_platform.h>
76884cb2 LJ	19	#include <linux/libata.h>
	20	#include <linux/reset.h>
	21	#include <linux/io.h>
	22	#include <linux/dma-mapping.h>
	23
	24	#include "ahci.h"
	25
018d5ef2 AM	26	#define DRV_NAME "st_ahci"
018d5ef2 AM	27
76884cb2 LJ	28	#define ST_AHCI_OOBR 0xbc
	29	#define ST_AHCI_OOBR_WE BIT(31)
	30	#define ST_AHCI_OOBR_CWMIN_SHIFT 24
	31	#define ST_AHCI_OOBR_CWMAX_SHIFT 16
	32	#define ST_AHCI_OOBR_CIMIN_SHIFT 8
	33	#define ST_AHCI_OOBR_CIMAX_SHIFT 0
	34
	35	struct st_ahci_drv_data {
	36	struct platform_device *ahci;
76884cb2 LJ	37	struct reset_control *pwr;
	38	struct reset_control *sw_rst;
	39	struct reset_control *pwr_rst;
	40	struct ahci_host_priv *hpriv;
	41	};
	42
	43	static void st_ahci_configure_oob(void __iomem *mmio)
	44	{
	45	unsigned long old_val, new_val;
	46
	47	new_val = (0x02 << ST_AHCI_OOBR_CWMIN_SHIFT) \|
	48	(0x04 << ST_AHCI_OOBR_CWMAX_SHIFT) \|
	49	(0x08 << ST_AHCI_OOBR_CIMIN_SHIFT) \|
	50	(0x0C << ST_AHCI_OOBR_CIMAX_SHIFT);
	51
	52	old_val = readl(mmio + ST_AHCI_OOBR);
	53	writel(old_val \| ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
	54	writel(new_val \| ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
	55	writel(new_val, mmio + ST_AHCI_OOBR);
	56	}
	57
	58	static int st_ahci_deassert_resets(struct device *dev)
	59	{
	60	struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
	61	int err;
	62
	63	if (drv_data->pwr) {
	64	err = reset_control_deassert(drv_data->pwr);
	65	if (err) {
	66	dev_err(dev, "unable to bring out of pwrdwn\n");
	67	return err;
	68	}
	69	}
	70
76884cb2 LJ	71	if (drv_data->sw_rst) {
	72	err = reset_control_deassert(drv_data->sw_rst);
	73	if (err) {
	74	dev_err(dev, "unable to bring out of sw-rst\n");
	75	return err;
	76	}
	77	}
	78
	79	if (drv_data->pwr_rst) {
	80	err = reset_control_deassert(drv_data->pwr_rst);
	81	if (err) {
	82	dev_err(dev, "unable to bring out of pwr-rst\n");
	83	return err;
	84	}
	85	}
	86
	87	return 0;
	88	}
	89
b032378b	90	static void st_ahci_host_stop(struct ata_host *host)
a8237084	91	{
b032378b BZ	92	struct ahci_host_priv *hpriv = host->private_data;
b032378b BZ	93	struct device *dev = host->dev;
a8237084	94	struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
a8237084 LJ	95	int err;
	96
	97	if (drv_data->pwr) {
	98	err = reset_control_assert(drv_data->pwr);
	99	if (err)
33081b34	100	dev_err(dev, "unable to pwrdwn\n");
a8237084 LJ	101	}
	102
	103	ahci_platform_disable_resources(hpriv);
a8237084 LJ	104	}
a8237084 LJ	105
76884cb2 LJ	106	static int st_ahci_probe_resets(struct platform_device *pdev)
	107	{
	108	struct st_ahci_drv_data *drv_data = platform_get_drvdata(pdev);
	109
	110	drv_data->pwr = devm_reset_control_get(&pdev->dev, "pwr-dwn");
	111	if (IS_ERR(drv_data->pwr)) {
	112	dev_info(&pdev->dev, "power reset control not defined\n");
	113	drv_data->pwr = NULL;
	114	}
	115
	116	drv_data->sw_rst = devm_reset_control_get(&pdev->dev, "sw-rst");
	117	if (IS_ERR(drv_data->sw_rst)) {
	118	dev_info(&pdev->dev, "soft reset control not defined\n");
	119	drv_data->sw_rst = NULL;
	120	}
	121
	122	drv_data->pwr_rst = devm_reset_control_get(&pdev->dev, "pwr-rst");
	123	if (IS_ERR(drv_data->pwr_rst)) {
	124	dev_dbg(&pdev->dev, "power soft reset control not defined\n");
	125	drv_data->pwr_rst = NULL;
	126	}
	127
	128	return st_ahci_deassert_resets(&pdev->dev);
	129	}
	130
b032378b BZ	131	static struct ata_port_operations st_ahci_port_ops = {
	132	.inherits = &ahci_platform_ops,
	133	.host_stop = st_ahci_host_stop,
	134	};
	135
76884cb2 LJ	136	static const struct ata_port_info st_ahci_port_info = {
	137	.flags = AHCI_FLAG_COMMON,
	138	.pio_mask = ATA_PIO4,
	139	.udma_mask = ATA_UDMA6,
b032378b	140	.port_ops = &st_ahci_port_ops,
76884cb2 LJ	141	};
76884cb2 LJ	142
018d5ef2 AM	143	static struct scsi_host_template ahci_platform_sht = {
	144	AHCI_SHT(DRV_NAME),
	145	};
	146
76884cb2 LJ	147	static int st_ahci_probe(struct platform_device *pdev)
	148	{
	149	struct st_ahci_drv_data *drv_data;
	150	struct ahci_host_priv *hpriv;
	151	int err;
	152
	153	drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
	154	if (!drv_data)
	155	return -ENOMEM;
	156
	157	platform_set_drvdata(pdev, drv_data);
	158
	159	hpriv = ahci_platform_get_resources(pdev);
	160	if (IS_ERR(hpriv))
	161	return PTR_ERR(hpriv);
	162
	163	drv_data->hpriv = hpriv;
	164
	165	err = st_ahci_probe_resets(pdev);
	166	if (err)
	167	return err;
	168
	169	err = ahci_platform_enable_resources(hpriv);
	170	if (err)
	171	return err;
	172
9a1e75e1 PG	173	st_ahci_configure_oob(drv_data->hpriv->mmio);
9a1e75e1 PG	174
018d5ef2 AM	175	err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info,
018d5ef2 AM	176	&ahci_platform_sht);
76884cb2 LJ	177	if (err) {
	178	ahci_platform_disable_resources(hpriv);
	179	return err;
	180	}
	181
	182	return 0;
	183	}
	184
76884cb2 LJ	185	#ifdef CONFIG_PM_SLEEP
	186	static int st_ahci_suspend(struct device *dev)
	187	{
	188	struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
	189	struct ahci_host_priv *hpriv = drv_data->hpriv;
	190	int err;
	191
33081b34 BZ	192	err = ahci_platform_suspend_host(dev);
	193	if (err)
	194	return err;
761a8c27	195
76884cb2 LJ	196	if (drv_data->pwr) {
	197	err = reset_control_assert(drv_data->pwr);
	198	if (err) {
	199	dev_err(dev, "unable to pwrdwn");
	200	return err;
	201	}
	202	}
	203
	204	ahci_platform_disable_resources(hpriv);
	205
	206	return 0;
	207	}
	208
	209	static int st_ahci_resume(struct device *dev)
	210	{
	211	struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
	212	struct ahci_host_priv *hpriv = drv_data->hpriv;
	213	int err;
	214
	215	err = ahci_platform_enable_resources(hpriv);
	216	if (err)
	217	return err;
	218
	219	err = st_ahci_deassert_resets(dev);
	220	if (err) {
	221	ahci_platform_disable_resources(hpriv);
	222	return err;
	223	}
	224
9a1e75e1 PG	225	st_ahci_configure_oob(drv_data->hpriv->mmio);
9a1e75e1 PG	226
761a8c27	227	return ahci_platform_resume_host(dev);
76884cb2 LJ	228	}
	229	#endif
	230
	231	static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
	232
09de99db	233	static const struct of_device_id st_ahci_match[] = {
76884cb2 LJ	234	{ .compatible = "st,ahci", },
	235	{},
	236	};
	237	MODULE_DEVICE_TABLE(of, st_ahci_match);
	238
	239	static struct platform_driver st_ahci_driver = {
	240	.driver = {
018d5ef2	241	.name = DRV_NAME,
76884cb2 LJ	242	.pm = &st_ahci_pm_ops,
	243	.of_match_table = of_match_ptr(st_ahci_match),
	244	},
	245	.probe = st_ahci_probe,
a8237084	246	.remove = ata_platform_remove_one,
76884cb2 LJ	247	};
	248	module_platform_driver(st_ahci_driver);
	249
	250	MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");
	251	MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>");
4a2e5123	252	MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver");
76884cb2	253	MODULE_LICENSE("GPL v2");