[mirror_ubuntu-jammy-kernel.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 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 int st_ahci_exit(struct device *dev)
{
	struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
	struct ahci_host_priv *hpriv = drv_data->hpriv;
	int err;

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

	ahci_platform_disable_resources(hpriv);

	return 0;
}

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

static int st_ahci_probe(struct platform_device *pdev)
{
	struct st_ahci_drv_data *drv_data;
	struct ahci_platform_data *pdata;
	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);

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

	pdata->exit = st_ahci_exit;
	pdev->dev.platform_data = pdata;

	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, 0, 0);
	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;

	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 0;
}
#endif

static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);

static 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 = "st_ahci",
		.owner = THIS_MODULE,
		.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
	26	#define ST_AHCI_OOBR 0xbc
	27	#define ST_AHCI_OOBR_WE BIT(31)
	28	#define ST_AHCI_OOBR_CWMIN_SHIFT 24
	29	#define ST_AHCI_OOBR_CWMAX_SHIFT 16
	30	#define ST_AHCI_OOBR_CIMIN_SHIFT 8
	31	#define ST_AHCI_OOBR_CIMAX_SHIFT 0
	32
	33	struct st_ahci_drv_data {
	34	struct platform_device *ahci;
76884cb2 LJ	35	struct reset_control *pwr;
	36	struct reset_control *sw_rst;
	37	struct reset_control *pwr_rst;
	38	struct ahci_host_priv *hpriv;
	39	};
	40
	41	static void st_ahci_configure_oob(void __iomem *mmio)
	42	{
	43	unsigned long old_val, new_val;
	44
	45	new_val = (0x02 << ST_AHCI_OOBR_CWMIN_SHIFT) \|
	46	(0x04 << ST_AHCI_OOBR_CWMAX_SHIFT) \|
	47	(0x08 << ST_AHCI_OOBR_CIMIN_SHIFT) \|
	48	(0x0C << ST_AHCI_OOBR_CIMAX_SHIFT);
	49
	50	old_val = readl(mmio + ST_AHCI_OOBR);
	51	writel(old_val \| ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
	52	writel(new_val \| ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
	53	writel(new_val, mmio + ST_AHCI_OOBR);
	54	}
	55
	56	static int st_ahci_deassert_resets(struct device *dev)
	57	{
	58	struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
	59	int err;
	60
	61	if (drv_data->pwr) {
	62	err = reset_control_deassert(drv_data->pwr);
	63	if (err) {
	64	dev_err(dev, "unable to bring out of pwrdwn\n");
	65	return err;
	66	}
	67	}
	68
	69	st_ahci_configure_oob(drv_data->hpriv->mmio);
	70
	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
a8237084 LJ	90	static int st_ahci_exit(struct device *dev)
	91	{
	92	struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
	93	struct ahci_host_priv *hpriv = drv_data->hpriv;
	94	int err;
	95
	96	if (drv_data->pwr) {
	97	err = reset_control_assert(drv_data->pwr);
	98	if (err)
	99	dev_err(&pdev->dev, "unable to pwrdwn\n");
	100	}
	101
	102	ahci_platform_disable_resources(hpriv);
	103
	104	return 0;
	105	}
	106
76884cb2 LJ	107	static int st_ahci_probe_resets(struct platform_device *pdev)
	108	{
	109	struct st_ahci_drv_data *drv_data = platform_get_drvdata(pdev);
	110
	111	drv_data->pwr = devm_reset_control_get(&pdev->dev, "pwr-dwn");
	112	if (IS_ERR(drv_data->pwr)) {
	113	dev_info(&pdev->dev, "power reset control not defined\n");
	114	drv_data->pwr = NULL;
	115	}
	116
	117	drv_data->sw_rst = devm_reset_control_get(&pdev->dev, "sw-rst");
	118	if (IS_ERR(drv_data->sw_rst)) {
	119	dev_info(&pdev->dev, "soft reset control not defined\n");
	120	drv_data->sw_rst = NULL;
	121	}
	122
	123	drv_data->pwr_rst = devm_reset_control_get(&pdev->dev, "pwr-rst");
	124	if (IS_ERR(drv_data->pwr_rst)) {
	125	dev_dbg(&pdev->dev, "power soft reset control not defined\n");
	126	drv_data->pwr_rst = NULL;
	127	}
	128
	129	return st_ahci_deassert_resets(&pdev->dev);
	130	}
	131
	132	static const struct ata_port_info st_ahci_port_info = {
	133	.flags = AHCI_FLAG_COMMON,
	134	.pio_mask = ATA_PIO4,
	135	.udma_mask = ATA_UDMA6,
	136	.port_ops = &ahci_platform_ops,
	137	};
	138
	139	static int st_ahci_probe(struct platform_device *pdev)
	140	{
	141	struct st_ahci_drv_data *drv_data;
a8237084	142	struct ahci_platform_data *pdata;
76884cb2 LJ	143	struct ahci_host_priv *hpriv;
	144	int err;
	145
	146	drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
	147	if (!drv_data)
	148	return -ENOMEM;
	149
	150	platform_set_drvdata(pdev, drv_data);
	151
a8237084 LJ	152	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	153	if (!pdata)
	154	return -ENOMEM;
	155
	156	pdata->exit = st_ahci_exit;
	157	pdev->dev.platform_data = pdata;
	158
76884cb2 LJ	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
	173	err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info, 0, 0);
	174	if (err) {
	175	ahci_platform_disable_resources(hpriv);
	176	return err;
	177	}
	178
	179	return 0;
	180	}
	181
76884cb2 LJ	182	#ifdef CONFIG_PM_SLEEP
	183	static int st_ahci_suspend(struct device *dev)
	184	{
	185	struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
	186	struct ahci_host_priv *hpriv = drv_data->hpriv;
	187	int err;
	188
	189	if (drv_data->pwr) {
	190	err = reset_control_assert(drv_data->pwr);
	191	if (err) {
	192	dev_err(dev, "unable to pwrdwn");
	193	return err;
	194	}
	195	}
	196
	197	ahci_platform_disable_resources(hpriv);
	198
	199	return 0;
	200	}
	201
	202	static int st_ahci_resume(struct device *dev)
	203	{
	204	struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
	205	struct ahci_host_priv *hpriv = drv_data->hpriv;
	206	int err;
	207
	208	err = ahci_platform_enable_resources(hpriv);
	209	if (err)
	210	return err;
	211
	212	err = st_ahci_deassert_resets(dev);
	213	if (err) {
	214	ahci_platform_disable_resources(hpriv);
	215	return err;
	216	}
	217
	218	return 0;
	219	}
	220	#endif
	221
	222	static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
	223
	224	static struct of_device_id st_ahci_match[] = {
	225	{ .compatible = "st,ahci", },
	226	{},
	227	};
	228	MODULE_DEVICE_TABLE(of, st_ahci_match);
	229
	230	static struct platform_driver st_ahci_driver = {
	231	.driver = {
	232	.name = "st_ahci",
	233	.owner = THIS_MODULE,
	234	.pm = &st_ahci_pm_ops,
	235	.of_match_table = of_match_ptr(st_ahci_match),
	236	},
	237	.probe = st_ahci_probe,
a8237084	238	.remove = ata_platform_remove_one,
76884cb2 LJ	239	};
	240	module_platform_driver(st_ahci_driver);
	241
	242	MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");
	243	MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>");
4a2e5123	244	MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver");
76884cb2	245	MODULE_LICENSE("GPL v2");