[linux-2.6-block.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/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;

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

	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);
	}

	ret = clk_prepare_enable(priv->clk);
	if (ret)
		return ret;

	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;

	io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	priv->host_regs = devm_ioremap_resource(&pdev->dev, io_res);
	if (IS_ERR(priv->host_regs)) {
		ret = PTR_ERR(priv->host_regs);
		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 = platform_get_drvdata(pdev);
	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_SLEEP
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;

	int ret = clk_prepare_enable(priv->clk);
	if (ret)
		return ret;

	__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;
}
#endif

static SIMPLE_DEV_PM_OPS(pata_imx_pm_ops, pata_imx_suspend, pata_imx_resume);

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

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,
		.pm		= &pata_imx_pm_ops,
	},
};

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 APR	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>
e39c75cf APR	18	#include <linux/blkdev.h>
	19	#include <scsi/scsi_host.h>
	20	#include <linux/ata.h>
	21	#include <linux/libata.h>
	22	#include <linux/platform_device.h>
	23	#include <linux/clk.h>
	24
	25	#define DRV_NAME "pata_imx"
	26
	27	#define PATA_IMX_ATA_CONTROL 0x24
	28	#define PATA_IMX_ATA_CTRL_FIFO_RST_B (1<<7)
	29	#define PATA_IMX_ATA_CTRL_ATA_RST_B (1<<6)
	30	#define PATA_IMX_ATA_CTRL_IORDY_EN (1<<0)
	31	#define PATA_IMX_ATA_INT_EN 0x2C
	32	#define PATA_IMX_ATA_INTR_ATA_INTRQ2 (1<<3)
	33	#define PATA_IMX_DRIVE_DATA 0xA0
	34	#define PATA_IMX_DRIVE_CONTROL 0xD8
	35
	36	struct pata_imx_priv {
	37	struct clk *clk;
	38	/* timings/interrupt/control regs */
51b5539c	39	void __iomem *host_regs;
e39c75cf APR	40	u32 ata_ctl;
	41	};
	42
	43	static int pata_imx_set_mode(struct ata_link link, struct ata_device *unused)
	44	{
	45	struct ata_device *dev;
	46	struct ata_port *ap = link->ap;
	47	struct pata_imx_priv *priv = ap->host->private_data;
	48	u32 val;
	49
	50	ata_for_each_dev(dev, link, ENABLED) {
	51	dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
	52	dev->xfer_shift = ATA_SHIFT_PIO;
	53	dev->flags \|= ATA_DFLAG_PIO;
	54
	55	val = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
	56	if (ata_pio_need_iordy(dev))
	57	val \|= PATA_IMX_ATA_CTRL_IORDY_EN;
	58	else
	59	val &= ~PATA_IMX_ATA_CTRL_IORDY_EN;
	60	__raw_writel(val, priv->host_regs + PATA_IMX_ATA_CONTROL);
	61
22c8be31	62	ata_dev_info(dev, "configured for PIO\n");
e39c75cf APR	63	}
	64	return 0;
	65	}
	66
	67	static struct scsi_host_template pata_imx_sht = {
	68	ATA_PIO_SHT(DRV_NAME),
	69	};
	70
	71	static struct ata_port_operations pata_imx_port_ops = {
	72	.inherits = &ata_sff_port_ops,
	73	.sff_data_xfer = ata_sff_data_xfer_noirq,
	74	.cable_detect = ata_cable_unknown,
	75	.set_mode = pata_imx_set_mode,
	76	};
	77
	78	static void pata_imx_setup_port(struct ata_ioports *ioaddr)
	79	{
	80	/* Fixup the port shift for platforms that need it */
	81	ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << 2);
	82	ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << 2);
	83	ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << 2);
	84	ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << 2);
	85	ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << 2);
	86	ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << 2);
	87	ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << 2);
	88	ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << 2);
	89	ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << 2);
	90	ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << 2);
	91	}
	92
0ec24914	93	static int pata_imx_probe(struct platform_device *pdev)
e39c75cf APR	94	{
	95	struct ata_host *host;
	96	struct ata_port *ap;
	97	struct pata_imx_priv *priv;
	98	int irq = 0;
	99	struct resource *io_res;
ff540d02	100	int ret;
e39c75cf	101
e39c75cf	102	irq = platform_get_irq(pdev, 0);
3ef9cc31 FE	103	if (irq < 0)
3ef9cc31 FE	104	return irq;
e39c75cf APR	105
	106	priv = devm_kzalloc(&pdev->dev,
	107	sizeof(struct pata_imx_priv), GFP_KERNEL);
	108	if (!priv)
	109	return -ENOMEM;
	110
50f5a341	111	priv->clk = devm_clk_get(&pdev->dev, NULL);
e39c75cf APR	112	if (IS_ERR(priv->clk)) {
	113	dev_err(&pdev->dev, "Failed to get clock\n");
	114	return PTR_ERR(priv->clk);
	115	}
	116
0475c947 FE	117	ret = clk_prepare_enable(priv->clk);
	118	if (ret)
	119	return ret;
e39c75cf APR	120
e39c75cf APR	121	host = ata_host_alloc(&pdev->dev, 1);
ff540d02 SH	122	if (!host) {
	123	ret = -ENOMEM;
	124	goto err;
	125	}
e39c75cf APR	126
	127	host->private_data = priv;
	128	ap = host->ports[0];
	129
	130	ap->ops = &pata_imx_port_ops;
	131	ap->pio_mask = ATA_PIO0;
	132	ap->flags \|= ATA_FLAG_SLAVE_POSS;
	133
b314fc77 FE	134	io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
b314fc77 FE	135	priv->host_regs = devm_ioremap_resource(&pdev->dev, io_res);
13e8e78b BZ	136	if (IS_ERR(priv->host_regs)) {
13e8e78b BZ	137	ret = PTR_ERR(priv->host_regs);
ff540d02	138	goto err;
e39c75cf APR	139	}
	140
	141	ap->ioaddr.cmd_addr = priv->host_regs + PATA_IMX_DRIVE_DATA;
	142	ap->ioaddr.ctl_addr = priv->host_regs + PATA_IMX_DRIVE_CONTROL;
	143
	144	ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
	145
	146	pata_imx_setup_port(&ap->ioaddr);
	147
	148	ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
	149	(unsigned long long)io_res->start + PATA_IMX_DRIVE_DATA,
	150	(unsigned long long)io_res->start + PATA_IMX_DRIVE_CONTROL);
	151
	152	/* deassert resets */
	153	__raw_writel(PATA_IMX_ATA_CTRL_FIFO_RST_B \|
	154	PATA_IMX_ATA_CTRL_ATA_RST_B,
	155	priv->host_regs + PATA_IMX_ATA_CONTROL);
	156	/* enable interrupts */
	157	__raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
	158	priv->host_regs + PATA_IMX_ATA_INT_EN);
	159
	160	/* activate */
ff540d02	161	ret = ata_host_activate(host, irq, ata_sff_interrupt, 0,
e39c75cf APR	162	&pata_imx_sht);
e39c75cf APR	163
ff540d02 SH	164	if (ret)
	165	goto err;
	166
	167	return 0;
	168	err:
a18dada0	169	clk_disable_unprepare(priv->clk);
50f5a341	170
ff540d02	171	return ret;
e39c75cf APR	172	}
e39c75cf APR	173
0ec24914	174	static int pata_imx_remove(struct platform_device *pdev)
e39c75cf	175	{
d89995db	176	struct ata_host *host = platform_get_drvdata(pdev);
e39c75cf APR	177	struct pata_imx_priv *priv = host->private_data;
	178
	179	ata_host_detach(host);
	180
	181	__raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
	182
a18dada0	183	clk_disable_unprepare(priv->clk);
e39c75cf APR	184
	185	return 0;
	186	}
	187
58eb8cd5	188	#ifdef CONFIG_PM_SLEEP
e39c75cf APR	189	static int pata_imx_suspend(struct device *dev)
	190	{
	191	struct ata_host *host = dev_get_drvdata(dev);
	192	struct pata_imx_priv *priv = host->private_data;
	193	int ret;
	194
	195	ret = ata_host_suspend(host, PMSG_SUSPEND);
	196	if (!ret) {
	197	__raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
	198	priv->ata_ctl =
	199	__raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
a18dada0	200	clk_disable_unprepare(priv->clk);
e39c75cf APR	201	}
	202
	203	return ret;
	204	}
	205
	206	static int pata_imx_resume(struct device *dev)
	207	{
	208	struct ata_host *host = dev_get_drvdata(dev);
	209	struct pata_imx_priv *priv = host->private_data;
	210
0475c947 FE	211	int ret = clk_prepare_enable(priv->clk);
	212	if (ret)
	213	return ret;
e39c75cf APR	214
	215	__raw_writel(priv->ata_ctl, priv->host_regs + PATA_IMX_ATA_CONTROL);
	216
	217	__raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
	218	priv->host_regs + PATA_IMX_ATA_INT_EN);
	219
	220	ata_host_resume(host);
	221
	222	return 0;
	223	}
e39c75cf APR	224	#endif
e39c75cf APR	225
36888e95 FE	226	static SIMPLE_DEV_PM_OPS(pata_imx_pm_ops, pata_imx_suspend, pata_imx_resume);
36888e95 FE	227
b9d15db2 SH	228	static const struct of_device_id imx_pata_dt_ids[] = {
	229	{
	230	.compatible = "fsl,imx27-pata",
	231	}, {
	232	/* sentinel */
	233	}
	234	};
71ab1d58	235	MODULE_DEVICE_TABLE(of, imx_pata_dt_ids);
b9d15db2	236
e39c75cf APR	237	static struct platform_driver pata_imx_driver = {
e39c75cf APR	238	.probe = pata_imx_probe,
0ec24914	239	.remove = pata_imx_remove,
e39c75cf APR	240	.driver = {
e39c75cf APR	241	.name = DRV_NAME,
b9d15db2	242	.of_match_table = imx_pata_dt_ids,
e39c75cf	243	.pm = &pata_imx_pm_ops,
e39c75cf APR	244	},
	245	};
	246
99c8ea3e	247	module_platform_driver(pata_imx_driver);
e39c75cf APR	248
	249	MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
	250	MODULE_DESCRIPTION("low-level driver for iMX PATA");
	251	MODULE_LICENSE("GPL");
	252	MODULE_ALIAS("platform:" DRV_NAME);