[mirror_ubuntu-artful-kernel.git] / drivers / ata / pata_imx.c

/*
 * Freescale iMX PATA driver
 *
 * Copyright (C) 2011 Arnaud Patard <arnaud.patard@rtp-net.org>
 *
 * Based on pata_platform - Copyright (C) 2006 - 2007  Paul Mundt
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * TODO:
 * - dmaengine support
 * - check if timing stuff needed
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <scsi/scsi_host.h>
#include <linux/ata.h>
#include <linux/libata.h>
#include <linux/platform_device.h>
#include <linux/clk.h>

#define DRV_NAME "pata_imx"

#define PATA_IMX_ATA_CONTROL		0x24
#define PATA_IMX_ATA_CTRL_FIFO_RST_B	(1<<7)
#define PATA_IMX_ATA_CTRL_ATA_RST_B	(1<<6)
#define PATA_IMX_ATA_CTRL_IORDY_EN	(1<<0)
#define PATA_IMX_ATA_INT_EN		0x2C
#define PATA_IMX_ATA_INTR_ATA_INTRQ2	(1<<3)
#define PATA_IMX_DRIVE_DATA		0xA0
#define PATA_IMX_DRIVE_CONTROL		0xD8

struct pata_imx_priv {
	struct clk *clk;
	/* timings/interrupt/control regs */
	void __iomem *host_regs;
	u32 ata_ctl;
};

static int pata_imx_set_mode(struct ata_link *link, struct ata_device **unused)
{
	struct ata_device *dev;
	struct ata_port *ap = link->ap;
	struct pata_imx_priv *priv = ap->host->private_data;
	u32 val;

	ata_for_each_dev(dev, link, ENABLED) {
		dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
		dev->xfer_shift = ATA_SHIFT_PIO;
		dev->flags |= ATA_DFLAG_PIO;

		val = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
		if (ata_pio_need_iordy(dev))
			val |= PATA_IMX_ATA_CTRL_IORDY_EN;
		else
			val &= ~PATA_IMX_ATA_CTRL_IORDY_EN;
		__raw_writel(val, priv->host_regs + PATA_IMX_ATA_CONTROL);

		ata_dev_info(dev, "configured for PIO\n");
	}
	return 0;
}

static struct scsi_host_template pata_imx_sht = {
	ATA_PIO_SHT(DRV_NAME),
};

static struct ata_port_operations pata_imx_port_ops = {
	.inherits		= &ata_sff_port_ops,
	.sff_data_xfer		= ata_sff_data_xfer_noirq,
	.cable_detect		= ata_cable_unknown,
	.set_mode		= pata_imx_set_mode,
};

static void pata_imx_setup_port(struct ata_ioports *ioaddr)
{
	/* Fixup the port shift for platforms that need it */
	ioaddr->data_addr	= ioaddr->cmd_addr + (ATA_REG_DATA    << 2);
	ioaddr->error_addr	= ioaddr->cmd_addr + (ATA_REG_ERR     << 2);
	ioaddr->feature_addr	= ioaddr->cmd_addr + (ATA_REG_FEATURE << 2);
	ioaddr->nsect_addr	= ioaddr->cmd_addr + (ATA_REG_NSECT   << 2);
	ioaddr->lbal_addr	= ioaddr->cmd_addr + (ATA_REG_LBAL    << 2);
	ioaddr->lbam_addr	= ioaddr->cmd_addr + (ATA_REG_LBAM    << 2);
	ioaddr->lbah_addr	= ioaddr->cmd_addr + (ATA_REG_LBAH    << 2);
	ioaddr->device_addr	= ioaddr->cmd_addr + (ATA_REG_DEVICE  << 2);
	ioaddr->status_addr	= ioaddr->cmd_addr + (ATA_REG_STATUS  << 2);
	ioaddr->command_addr	= ioaddr->cmd_addr + (ATA_REG_CMD     << 2);
}

static int pata_imx_probe(struct platform_device *pdev)
{
	struct ata_host *host;
	struct ata_port *ap;
	struct pata_imx_priv *priv;
	int irq = 0;
	struct resource *io_res;
	int ret;

	io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (io_res == NULL)
		return -EINVAL;

	irq = platform_get_irq(pdev, 0);
	if (irq <= 0)
		return -EINVAL;

	priv = devm_kzalloc(&pdev->dev,
				sizeof(struct pata_imx_priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(priv->clk)) {
		dev_err(&pdev->dev, "Failed to get clock\n");
		return PTR_ERR(priv->clk);
	}

	clk_prepare_enable(priv->clk);

	host = ata_host_alloc(&pdev->dev, 1);
	if (!host) {
		ret = -ENOMEM;
		goto err;
	}

	host->private_data = priv;
	ap = host->ports[0];

	ap->ops = &pata_imx_port_ops;
	ap->pio_mask = ATA_PIO0;
	ap->flags |= ATA_FLAG_SLAVE_POSS;

	priv->host_regs = devm_ioremap(&pdev->dev, io_res->start,
		resource_size(io_res));
	if (!priv->host_regs) {
		dev_err(&pdev->dev, "failed to map IO/CTL base\n");
		ret = -EBUSY;
		goto err;
	}

	ap->ioaddr.cmd_addr = priv->host_regs + PATA_IMX_DRIVE_DATA;
	ap->ioaddr.ctl_addr = priv->host_regs + PATA_IMX_DRIVE_CONTROL;

	ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;

	pata_imx_setup_port(&ap->ioaddr);

	ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
		(unsigned long long)io_res->start + PATA_IMX_DRIVE_DATA,
		(unsigned long long)io_res->start + PATA_IMX_DRIVE_CONTROL);

	/* deassert resets */
	__raw_writel(PATA_IMX_ATA_CTRL_FIFO_RST_B |
			PATA_IMX_ATA_CTRL_ATA_RST_B,
			priv->host_regs + PATA_IMX_ATA_CONTROL);
	/* enable interrupts */
	__raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
			priv->host_regs + PATA_IMX_ATA_INT_EN);

	/* activate */
	ret = ata_host_activate(host, irq, ata_sff_interrupt, 0,
				&pata_imx_sht);

	if (ret)
		goto err;

	return 0;
err:
	clk_disable_unprepare(priv->clk);

	return ret;
}

static int pata_imx_remove(struct platform_device *pdev)
{
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
	struct pata_imx_priv *priv = host->private_data;

	ata_host_detach(host);

	__raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);

	clk_disable_unprepare(priv->clk);

	return 0;
}

#ifdef CONFIG_PM
static int pata_imx_suspend(struct device *dev)
{
	struct ata_host *host = dev_get_drvdata(dev);
	struct pata_imx_priv *priv = host->private_data;
	int ret;

	ret = ata_host_suspend(host, PMSG_SUSPEND);
	if (!ret) {
		__raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
		priv->ata_ctl =
			__raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
		clk_disable_unprepare(priv->clk);
	}

	return ret;
}

static int pata_imx_resume(struct device *dev)
{
	struct ata_host *host = dev_get_drvdata(dev);
	struct pata_imx_priv *priv = host->private_data;

	clk_prepare_enable(priv->clk);

	__raw_writel(priv->ata_ctl, priv->host_regs + PATA_IMX_ATA_CONTROL);

	__raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
			priv->host_regs + PATA_IMX_ATA_INT_EN);

	ata_host_resume(host);

	return 0;
}

static const struct dev_pm_ops pata_imx_pm_ops = {
	.suspend	= pata_imx_suspend,
	.resume		= pata_imx_resume,
};
#endif

static const struct of_device_id imx_pata_dt_ids[] = {
	{
		.compatible = "fsl,imx27-pata",
	}, {
		/* sentinel */
	}
};

static struct platform_driver pata_imx_driver = {
	.probe		= pata_imx_probe,
	.remove		= pata_imx_remove,
	.driver = {
		.name		= DRV_NAME,
		.of_match_table	= imx_pata_dt_ids,
		.owner		= THIS_MODULE,
#ifdef CONFIG_PM
		.pm		= &pata_imx_pm_ops,
#endif
	},
};

module_platform_driver(pata_imx_driver);

MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
MODULE_DESCRIPTION("low-level driver for iMX PATA");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
Commit	Line	Data
e39c75cf AP	1	/*
	2	* Freescale iMX PATA driver
	3	*
	4	* Copyright (C) 2011 Arnaud Patard <arnaud.patard@rtp-net.org>
	5	*
	6	* Based on pata_platform - Copyright (C) 2006 - 2007 Paul Mundt
	7	*
	8	* This file is subject to the terms and conditions of the GNU General Public
	9	* License. See the file "COPYING" in the main directory of this archive
	10	* for more details.
	11	*
	12	* TODO:
	13	* - dmaengine support
	14	* - check if timing stuff needed
	15	*/
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/init.h>
	19	#include <linux/blkdev.h>
	20	#include <scsi/scsi_host.h>
	21	#include <linux/ata.h>
	22	#include <linux/libata.h>
	23	#include <linux/platform_device.h>
	24	#include <linux/clk.h>
	25
	26	#define DRV_NAME "pata_imx"
	27
	28	#define PATA_IMX_ATA_CONTROL 0x24
	29	#define PATA_IMX_ATA_CTRL_FIFO_RST_B (1<<7)
	30	#define PATA_IMX_ATA_CTRL_ATA_RST_B (1<<6)
	31	#define PATA_IMX_ATA_CTRL_IORDY_EN (1<<0)
	32	#define PATA_IMX_ATA_INT_EN 0x2C
	33	#define PATA_IMX_ATA_INTR_ATA_INTRQ2 (1<<3)
	34	#define PATA_IMX_DRIVE_DATA 0xA0
	35	#define PATA_IMX_DRIVE_CONTROL 0xD8
	36
	37	struct pata_imx_priv {
	38	struct clk *clk;
	39	/* timings/interrupt/control regs */
51b5539c	40	void __iomem *host_regs;
e39c75cf AP	41	u32 ata_ctl;
	42	};
	43
	44	static int pata_imx_set_mode(struct ata_link link, struct ata_device *unused)
	45	{
	46	struct ata_device *dev;
	47	struct ata_port *ap = link->ap;
	48	struct pata_imx_priv *priv = ap->host->private_data;
	49	u32 val;
	50
	51	ata_for_each_dev(dev, link, ENABLED) {
	52	dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
	53	dev->xfer_shift = ATA_SHIFT_PIO;
	54	dev->flags \|= ATA_DFLAG_PIO;
	55
	56	val = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
	57	if (ata_pio_need_iordy(dev))
	58	val \|= PATA_IMX_ATA_CTRL_IORDY_EN;
	59	else
	60	val &= ~PATA_IMX_ATA_CTRL_IORDY_EN;
	61	__raw_writel(val, priv->host_regs + PATA_IMX_ATA_CONTROL);
	62
22c8be31	63	ata_dev_info(dev, "configured for PIO\n");
e39c75cf AP	64	}
	65	return 0;
	66	}
	67
	68	static struct scsi_host_template pata_imx_sht = {
	69	ATA_PIO_SHT(DRV_NAME),
	70	};
	71
	72	static struct ata_port_operations pata_imx_port_ops = {
	73	.inherits = &ata_sff_port_ops,
	74	.sff_data_xfer = ata_sff_data_xfer_noirq,
	75	.cable_detect = ata_cable_unknown,
	76	.set_mode = pata_imx_set_mode,
	77	};
	78
	79	static void pata_imx_setup_port(struct ata_ioports *ioaddr)
	80	{
	81	/* Fixup the port shift for platforms that need it */
	82	ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << 2);
	83	ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << 2);
	84	ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << 2);
	85	ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << 2);
	86	ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << 2);
	87	ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << 2);
	88	ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << 2);
	89	ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << 2);
	90	ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << 2);
	91	ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << 2);
	92	}
	93
0ec24914	94	static int pata_imx_probe(struct platform_device *pdev)
e39c75cf AP	95	{
	96	struct ata_host *host;
	97	struct ata_port *ap;
	98	struct pata_imx_priv *priv;
	99	int irq = 0;
	100	struct resource *io_res;
ff540d02	101	int ret;
e39c75cf AP	102
	103	io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	104	if (io_res == NULL)
	105	return -EINVAL;
	106
	107	irq = platform_get_irq(pdev, 0);
	108	if (irq <= 0)
	109	return -EINVAL;
	110
	111	priv = devm_kzalloc(&pdev->dev,
	112	sizeof(struct pata_imx_priv), GFP_KERNEL);
	113	if (!priv)
	114	return -ENOMEM;
	115
50f5a341	116	priv->clk = devm_clk_get(&pdev->dev, NULL);
e39c75cf AP	117	if (IS_ERR(priv->clk)) {
	118	dev_err(&pdev->dev, "Failed to get clock\n");
	119	return PTR_ERR(priv->clk);
	120	}
	121
a18dada0	122	clk_prepare_enable(priv->clk);
e39c75cf AP	123
e39c75cf AP	124	host = ata_host_alloc(&pdev->dev, 1);
ff540d02 SH	125	if (!host) {
	126	ret = -ENOMEM;
	127	goto err;
	128	}
e39c75cf AP	129
	130	host->private_data = priv;
	131	ap = host->ports[0];
	132
	133	ap->ops = &pata_imx_port_ops;
	134	ap->pio_mask = ATA_PIO0;
	135	ap->flags \|= ATA_FLAG_SLAVE_POSS;
	136
	137	priv->host_regs = devm_ioremap(&pdev->dev, io_res->start,
	138	resource_size(io_res));
	139	if (!priv->host_regs) {
	140	dev_err(&pdev->dev, "failed to map IO/CTL base\n");
ff540d02 SH	141	ret = -EBUSY;
ff540d02 SH	142	goto err;
e39c75cf AP	143	}
	144
	145	ap->ioaddr.cmd_addr = priv->host_regs + PATA_IMX_DRIVE_DATA;
	146	ap->ioaddr.ctl_addr = priv->host_regs + PATA_IMX_DRIVE_CONTROL;
	147
	148	ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
	149
	150	pata_imx_setup_port(&ap->ioaddr);
	151
	152	ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
	153	(unsigned long long)io_res->start + PATA_IMX_DRIVE_DATA,
	154	(unsigned long long)io_res->start + PATA_IMX_DRIVE_CONTROL);
	155
	156	/* deassert resets */
	157	__raw_writel(PATA_IMX_ATA_CTRL_FIFO_RST_B \|
	158	PATA_IMX_ATA_CTRL_ATA_RST_B,
	159	priv->host_regs + PATA_IMX_ATA_CONTROL);
	160	/* enable interrupts */
	161	__raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
	162	priv->host_regs + PATA_IMX_ATA_INT_EN);
	163
	164	/* activate */
ff540d02	165	ret = ata_host_activate(host, irq, ata_sff_interrupt, 0,
e39c75cf AP	166	&pata_imx_sht);
e39c75cf AP	167
ff540d02 SH	168	if (ret)
	169	goto err;
	170
	171	return 0;
	172	err:
a18dada0	173	clk_disable_unprepare(priv->clk);
50f5a341	174
ff540d02	175	return ret;
e39c75cf AP	176	}
e39c75cf AP	177
0ec24914	178	static int pata_imx_remove(struct platform_device *pdev)
e39c75cf AP	179	{
	180	struct ata_host *host = dev_get_drvdata(&pdev->dev);
	181	struct pata_imx_priv *priv = host->private_data;
	182
	183	ata_host_detach(host);
	184
	185	__raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
	186
a18dada0	187	clk_disable_unprepare(priv->clk);
e39c75cf AP	188
	189	return 0;
	190	}
	191
	192	#ifdef CONFIG_PM
	193	static int pata_imx_suspend(struct device *dev)
	194	{
	195	struct ata_host *host = dev_get_drvdata(dev);
	196	struct pata_imx_priv *priv = host->private_data;
	197	int ret;
	198
	199	ret = ata_host_suspend(host, PMSG_SUSPEND);
	200	if (!ret) {
	201	__raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
	202	priv->ata_ctl =
	203	__raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
a18dada0	204	clk_disable_unprepare(priv->clk);
e39c75cf AP	205	}
	206
	207	return ret;
	208	}
	209
	210	static int pata_imx_resume(struct device *dev)
	211	{
	212	struct ata_host *host = dev_get_drvdata(dev);
	213	struct pata_imx_priv *priv = host->private_data;
	214
a18dada0	215	clk_prepare_enable(priv->clk);
e39c75cf AP	216
	217	__raw_writel(priv->ata_ctl, priv->host_regs + PATA_IMX_ATA_CONTROL);
	218
	219	__raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
	220	priv->host_regs + PATA_IMX_ATA_INT_EN);
	221
	222	ata_host_resume(host);
	223
	224	return 0;
	225	}
	226
	227	static const struct dev_pm_ops pata_imx_pm_ops = {
	228	.suspend = pata_imx_suspend,
	229	.resume = pata_imx_resume,
	230	};
	231	#endif
	232
b9d15db2 SH	233	static const struct of_device_id imx_pata_dt_ids[] = {
	234	{
	235	.compatible = "fsl,imx27-pata",
	236	}, {
	237	/* sentinel */
	238	}
	239	};
	240
e39c75cf AP	241	static struct platform_driver pata_imx_driver = {
e39c75cf AP	242	.probe = pata_imx_probe,
0ec24914	243	.remove = pata_imx_remove,
e39c75cf AP	244	.driver = {
e39c75cf AP	245	.name = DRV_NAME,
b9d15db2	246	.of_match_table = imx_pata_dt_ids,
e39c75cf AP	247	.owner = THIS_MODULE,
	248	#ifdef CONFIG_PM
	249	.pm = &pata_imx_pm_ops,
	250	#endif
	251	},
	252	};
	253
99c8ea3e	254	module_platform_driver(pata_imx_driver);
e39c75cf AP	255
	256	MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
	257	MODULE_DESCRIPTION("low-level driver for iMX PATA");
	258	MODULE_LICENSE("GPL");
	259	MODULE_ALIAS("platform:" DRV_NAME);