[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;
		}
	}

	st_ahci_configure_oob(drv_data->hpriv->mmio);

	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;

	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;
	}

	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
	71	st_ahci_configure_oob(drv_data->hpriv->mmio);
	72
	73	if (drv_data->sw_rst) {
	74	err = reset_control_deassert(drv_data->sw_rst);
	75	if (err) {
	76	dev_err(dev, "unable to bring out of sw-rst\n");
	77	return err;
	78	}
	79	}
	80
	81	if (drv_data->pwr_rst) {
	82	err = reset_control_deassert(drv_data->pwr_rst);
	83	if (err) {
	84	dev_err(dev, "unable to bring out of pwr-rst\n");
	85	return err;
	86	}
	87	}
	88
	89	return 0;
	90	}
	91
b032378b	92	static void st_ahci_host_stop(struct ata_host *host)
a8237084	93	{
b032378b BZ	94	struct ahci_host_priv *hpriv = host->private_data;
b032378b BZ	95	struct device *dev = host->dev;
a8237084	96	struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
a8237084 LJ	97	int err;
	98
	99	if (drv_data->pwr) {
	100	err = reset_control_assert(drv_data->pwr);
	101	if (err)
33081b34	102	dev_err(dev, "unable to pwrdwn\n");
a8237084 LJ	103	}
	104
	105	ahci_platform_disable_resources(hpriv);
a8237084 LJ	106	}
a8237084 LJ	107
76884cb2 LJ	108	static int st_ahci_probe_resets(struct platform_device *pdev)
	109	{
	110	struct st_ahci_drv_data *drv_data = platform_get_drvdata(pdev);
	111
	112	drv_data->pwr = devm_reset_control_get(&pdev->dev, "pwr-dwn");
	113	if (IS_ERR(drv_data->pwr)) {
	114	dev_info(&pdev->dev, "power reset control not defined\n");
	115	drv_data->pwr = NULL;
	116	}
	117
	118	drv_data->sw_rst = devm_reset_control_get(&pdev->dev, "sw-rst");
	119	if (IS_ERR(drv_data->sw_rst)) {
	120	dev_info(&pdev->dev, "soft reset control not defined\n");
	121	drv_data->sw_rst = NULL;
	122	}
	123
	124	drv_data->pwr_rst = devm_reset_control_get(&pdev->dev, "pwr-rst");
	125	if (IS_ERR(drv_data->pwr_rst)) {
	126	dev_dbg(&pdev->dev, "power soft reset control not defined\n");
	127	drv_data->pwr_rst = NULL;
	128	}
	129
	130	return st_ahci_deassert_resets(&pdev->dev);
	131	}
	132
b032378b BZ	133	static struct ata_port_operations st_ahci_port_ops = {
	134	.inherits = &ahci_platform_ops,
	135	.host_stop = st_ahci_host_stop,
	136	};
	137
76884cb2 LJ	138	static const struct ata_port_info st_ahci_port_info = {
	139	.flags = AHCI_FLAG_COMMON,
	140	.pio_mask = ATA_PIO4,
	141	.udma_mask = ATA_UDMA6,
b032378b	142	.port_ops = &st_ahci_port_ops,
76884cb2 LJ	143	};
76884cb2 LJ	144
018d5ef2 AM	145	static struct scsi_host_template ahci_platform_sht = {
	146	AHCI_SHT(DRV_NAME),
	147	};
	148
76884cb2 LJ	149	static int st_ahci_probe(struct platform_device *pdev)
	150	{
	151	struct st_ahci_drv_data *drv_data;
	152	struct ahci_host_priv *hpriv;
	153	int err;
	154
	155	drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
	156	if (!drv_data)
	157	return -ENOMEM;
	158
	159	platform_set_drvdata(pdev, drv_data);
	160
	161	hpriv = ahci_platform_get_resources(pdev);
	162	if (IS_ERR(hpriv))
	163	return PTR_ERR(hpriv);
	164
	165	drv_data->hpriv = hpriv;
	166
	167	err = st_ahci_probe_resets(pdev);
	168	if (err)
	169	return err;
	170
	171	err = ahci_platform_enable_resources(hpriv);
	172	if (err)
	173	return err;
	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
761a8c27	225	return ahci_platform_resume_host(dev);
76884cb2 LJ	226	}
	227	#endif
	228
	229	static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
	230
09de99db	231	static const struct of_device_id st_ahci_match[] = {
76884cb2 LJ	232	{ .compatible = "st,ahci", },
	233	{},
	234	};
	235	MODULE_DEVICE_TABLE(of, st_ahci_match);
	236
	237	static struct platform_driver st_ahci_driver = {
	238	.driver = {
018d5ef2	239	.name = DRV_NAME,
76884cb2 LJ	240	.pm = &st_ahci_pm_ops,
	241	.of_match_table = of_match_ptr(st_ahci_match),
	242	},
	243	.probe = st_ahci_probe,
a8237084	244	.remove = ata_platform_remove_one,
76884cb2 LJ	245	};
	246	module_platform_driver(st_ahci_driver);
	247
	248	MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");
	249	MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>");
4a2e5123	250	MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver");
76884cb2	251	MODULE_LICENSE("GPL v2");