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

/*
 * Generic platform device PATA driver
 *
 * Copyright (C) 2006 - 2007  Paul Mundt
 *
 * Based on pata_pcmcia:
 *
 *   Copyright 2005-2006 Red Hat Inc, all rights reserved.
 *
 * 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.
 */
#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/ata_platform.h>

#define DRV_NAME "pata_platform"
#define DRV_VERSION "1.2"

static int pio_mask = 1;

/*
 * Provide our own set_mode() as we don't want to change anything that has
 * already been configured..
 */
static int pata_platform_set_mode(struct ata_link *link, struct ata_device **unused)
{
	struct ata_device *dev;

	ata_for_each_dev(dev, link, ENABLED) {
		/* We don't really care */
		dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
		dev->xfer_shift = ATA_SHIFT_PIO;
		dev->flags |= ATA_DFLAG_PIO;
		ata_dev_info(dev, "configured for PIO\n");
	}
	return 0;
}

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

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

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

/**
 *	__pata_platform_probe		-	attach a platform interface
 *	@dev: device
 *	@io_res: Resource representing I/O base
 *	@ctl_res: Resource representing CTL base
 *	@irq_res: Resource representing IRQ and its flags
 *	@ioport_shift: I/O port shift
 *	@__pio_mask: PIO mask
 *
 *	Register a platform bus IDE interface. Such interfaces are PIO and we
 *	assume do not support IRQ sharing.
 *
 *	Platform devices are expected to contain at least 2 resources per port:
 *
 *		- I/O Base (IORESOURCE_IO or IORESOURCE_MEM)
 *		- CTL Base (IORESOURCE_IO or IORESOURCE_MEM)
 *
 *	and optionally:
 *
 *		- IRQ	   (IORESOURCE_IRQ)
 *
 *	If the base resources are both mem types, the ioremap() is handled
 *	here. For IORESOURCE_IO, it's assumed that there's no remapping
 *	necessary.
 *
 *	If no IRQ resource is present, PIO polling mode is used instead.
 */
int __pata_platform_probe(struct device *dev, struct resource *io_res,
			  struct resource *ctl_res, struct resource *irq_res,
			  unsigned int ioport_shift, int __pio_mask)
{
	struct ata_host *host;
	struct ata_port *ap;
	unsigned int mmio;
	int irq = 0;
	int irq_flags = 0;

	/*
	 * Check for MMIO
	 */
	mmio = (( io_res->flags == IORESOURCE_MEM) &&
		(ctl_res->flags == IORESOURCE_MEM));

	/*
	 * And the IRQ
	 */
	if (irq_res && irq_res->start > 0) {
		irq = irq_res->start;
		irq_flags = irq_res->flags;
	}

	/*
	 * Now that that's out of the way, wire up the port..
	 */
	host = ata_host_alloc(dev, 1);
	if (!host)
		return -ENOMEM;
	ap = host->ports[0];

	ap->ops = &pata_platform_port_ops;
	ap->pio_mask = __pio_mask;
	ap->flags |= ATA_FLAG_SLAVE_POSS;

	/*
	 * Use polling mode if there's no IRQ
	 */
	if (!irq) {
		ap->flags |= ATA_FLAG_PIO_POLLING;
		ata_port_desc(ap, "no IRQ, using PIO polling");
	}

	/*
	 * Handle the MMIO case
	 */
	if (mmio) {
		ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start,
				resource_size(io_res));
		ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,
				resource_size(ctl_res));
	} else {
		ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,
				resource_size(io_res));
		ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,
				resource_size(ctl_res));
	}
	if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {
		dev_err(dev, "failed to map IO/CTL base\n");
		return -ENOMEM;
	}

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

	pata_platform_setup_port(&ap->ioaddr, ioport_shift);

	ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport",
		      (unsigned long long)io_res->start,
		      (unsigned long long)ctl_res->start);

	/* activate */
	return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
				 irq_flags, &pata_platform_sht);
}
EXPORT_SYMBOL_GPL(__pata_platform_probe);

static int pata_platform_probe(struct platform_device *pdev)
{
	struct resource *io_res;
	struct resource *ctl_res;
	struct resource *irq_res;
	struct pata_platform_info *pp_info = dev_get_platdata(&pdev->dev);

	/*
	 * Simple resource validation ..
	 */
	if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) {
		dev_err(&pdev->dev, "invalid number of resources\n");
		return -EINVAL;
	}

	/*
	 * Get the I/O base first
	 */
	io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	if (io_res == NULL) {
		io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (unlikely(io_res == NULL))
			return -EINVAL;
	}

	/*
	 * Then the CTL base
	 */
	ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
	if (ctl_res == NULL) {
		ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
		if (unlikely(ctl_res == NULL))
			return -EINVAL;
	}

	/*
	 * And the IRQ
	 */
	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (irq_res)
		irq_res->flags = pp_info ? pp_info->irq_flags : 0;

	return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res,
				     pp_info ? pp_info->ioport_shift : 0,
				     pio_mask);
}

static struct platform_driver pata_platform_driver = {
	.probe		= pata_platform_probe,
	.remove		= ata_platform_remove_one,
	.driver = {
		.name		= DRV_NAME,
		.owner		= THIS_MODULE,
	},
};

module_platform_driver(pata_platform_driver);

module_param(pio_mask, int, 0);

MODULE_AUTHOR("Paul Mundt");
MODULE_DESCRIPTION("low-level driver for platform device ATA");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
MODULE_ALIAS("platform:" DRV_NAME);
Commit	Line	Data
a20c9e82 PM	1	/*
	2	* Generic platform device PATA driver
	3	*
f7fc0ceb	4	* Copyright (C) 2006 - 2007 Paul Mundt
a20c9e82 PM	5	*
	6	* Based on pata_pcmcia:
	7	*
ab771630	8	* Copyright 2005-2006 Red Hat Inc, all rights reserved.
a20c9e82 PM	9	*
	10	* This file is subject to the terms and conditions of the GNU General Public
	11	* License. See the file "COPYING" in the main directory of this archive
	12	* for more details.
	13	*/
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
a20c9e82 PM	16	#include <linux/blkdev.h>
	17	#include <scsi/scsi_host.h>
	18	#include <linux/ata.h>
	19	#include <linux/libata.h>
	20	#include <linux/platform_device.h>
0a87e3e9	21	#include <linux/ata_platform.h>
a20c9e82 PM	22
a20c9e82 PM	23	#define DRV_NAME "pata_platform"
f7fc0ceb	24	#define DRV_VERSION "1.2"
a20c9e82 PM	25
	26	static int pio_mask = 1;
	27
	28	/*
	29	* Provide our own set_mode() as we don't want to change anything that has
	30	* already been configured..
	31	*/
0260731f	32	static int pata_platform_set_mode(struct ata_link link, struct ata_device *unused)
a20c9e82	33	{
f58229f8	34	struct ata_device *dev;
a20c9e82	35
1eca4365 TH	36	ata_for_each_dev(dev, link, ENABLED) {
	37	/* We don't really care */
	38	dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
	39	dev->xfer_shift = ATA_SHIFT_PIO;
	40	dev->flags \|= ATA_DFLAG_PIO;
a9a79dfe	41	ata_dev_info(dev, "configured for PIO\n");
a20c9e82	42	}
161c888b	43	return 0;
a20c9e82 PM	44	}
a20c9e82 PM	45
a20c9e82	46	static struct scsi_host_template pata_platform_sht = {
68d1d07b	47	ATA_PIO_SHT(DRV_NAME),
a20c9e82 PM	48	};
	49
	50	static struct ata_port_operations pata_platform_port_ops = {
029cfd6b	51	.inherits = &ata_sff_port_ops,
5682ed33	52	.sff_data_xfer = ata_sff_data_xfer_noirq,
029cfd6b TH	53	.cable_detect = ata_cable_unknown,
029cfd6b TH	54	.set_mode = pata_platform_set_mode,
a20c9e82 PM	55	};
	56
	57	static void pata_platform_setup_port(struct ata_ioports *ioaddr,
cf03613e	58	unsigned int shift)
a20c9e82	59	{
a20c9e82	60	/* Fixup the port shift for platforms that need it */
a20c9e82 PM	61	ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift);
	62	ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift);
	63	ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift);
	64	ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift);
	65	ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift);
	66	ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift);
	67	ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift);
	68	ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift);
	69	ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift);
	70	ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift);
	71	}
	72
	73	/**
cf03613e AV	74	* __pata_platform_probe - attach a platform interface
	75	* @dev: device
	76	* @io_res: Resource representing I/O base
	77	* @ctl_res: Resource representing CTL base
	78	* @irq_res: Resource representing IRQ and its flags
	79	* @ioport_shift: I/O port shift
	80	* @__pio_mask: PIO mask
a20c9e82 PM	81	*
	82	* Register a platform bus IDE interface. Such interfaces are PIO and we
	83	* assume do not support IRQ sharing.
	84	*
f7fc0ceb	85	* Platform devices are expected to contain at least 2 resources per port:
a20c9e82 PM	86	*
	87	* - I/O Base (IORESOURCE_IO or IORESOURCE_MEM)
	88	* - CTL Base (IORESOURCE_IO or IORESOURCE_MEM)
f7fc0ceb PM	89	*
	90	* and optionally:
	91	*
a20c9e82 PM	92	* - IRQ (IORESOURCE_IRQ)
	93	*
	94	* If the base resources are both mem types, the ioremap() is handled
	95	* here. For IORESOURCE_IO, it's assumed that there's no remapping
	96	* necessary.
f7fc0ceb PM	97	*
f7fc0ceb PM	98	* If no IRQ resource is present, PIO polling mode is used instead.
a20c9e82	99	*/
0ec24914 GKH	100	int __pata_platform_probe(struct device dev, struct resource io_res,
	101	struct resource ctl_res, struct resource irq_res,
	102	unsigned int ioport_shift, int __pio_mask)
a20c9e82	103	{
5d728824 TH	104	struct ata_host *host;
5d728824 TH	105	struct ata_port *ap;
a20c9e82	106	unsigned int mmio;
cf03613e AV	107	int irq = 0;
cf03613e AV	108	int irq_flags = 0;
a20c9e82 PM	109
	110	/*
	111	* Check for MMIO
	112	*/
	113	mmio = (( io_res->flags == IORESOURCE_MEM) &&
	114	(ctl_res->flags == IORESOURCE_MEM));
	115
f7fc0ceb PM	116	/*
	117	* And the IRQ
	118	*/
cf03613e AV	119	if (irq_res && irq_res->start > 0) {
	120	irq = irq_res->start;
	121	irq_flags = irq_res->flags;
	122	}
f7fc0ceb	123
a20c9e82 PM	124	/*
	125	* Now that that's out of the way, wire up the port..
	126	*/
cf03613e	127	host = ata_host_alloc(dev, 1);
5d728824 TH	128	if (!host)
	129	return -ENOMEM;
	130	ap = host->ports[0];
	131
	132	ap->ops = &pata_platform_port_ops;
cf03613e	133	ap->pio_mask = __pio_mask;
5d728824	134	ap->flags \|= ATA_FLAG_SLAVE_POSS;
a20c9e82	135
f7fc0ceb PM	136	/*
	137	* Use polling mode if there's no IRQ
	138	*/
	139	if (!irq) {
	140	ap->flags \|= ATA_FLAG_PIO_POLLING;
	141	ata_port_desc(ap, "no IRQ, using PIO polling");
	142	}
	143
a20c9e82 PM	144	/*
	145	* Handle the MMIO case
	146	*/
	147	if (mmio) {
cf03613e	148	ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start,
041b5eac	149	resource_size(io_res));
cf03613e	150	ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,
041b5eac	151	resource_size(ctl_res));
a20c9e82	152	} else {
cf03613e	153	ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,
041b5eac	154	resource_size(io_res));
cf03613e	155	ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,
041b5eac	156	resource_size(ctl_res));
0d5ff566	157	}
5d728824	158	if (!ap->ioaddr.cmd_addr \|\| !ap->ioaddr.ctl_addr) {
cf03613e	159	dev_err(dev, "failed to map IO/CTL base\n");
0d5ff566	160	return -ENOMEM;
a20c9e82 PM	161	}
a20c9e82 PM	162
5d728824	163	ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
a20c9e82	164
cf03613e	165	pata_platform_setup_port(&ap->ioaddr, ioport_shift);
a20c9e82	166
cbcdd875 TH	167	ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport",
	168	(unsigned long long)io_res->start,
	169	(unsigned long long)ctl_res->start);
	170
5d728824	171	/* activate */
9363c382	172	return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
cf03613e	173	irq_flags, &pata_platform_sht);
a20c9e82	174	}
cf03613e	175	EXPORT_SYMBOL_GPL(__pata_platform_probe);
a20c9e82	176
0ec24914	177	static int pata_platform_probe(struct platform_device *pdev)
cf03613e AV	178	{
	179	struct resource *io_res;
	180	struct resource *ctl_res;
	181	struct resource *irq_res;
61b8c345	182	struct pata_platform_info *pp_info = dev_get_platdata(&pdev->dev);
cf03613e AV	183
	184	/*
	185	* Simple resource validation ..
	186	*/
	187	if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) {
	188	dev_err(&pdev->dev, "invalid number of resources\n");
	189	return -EINVAL;
	190	}
	191
	192	/*
	193	* Get the I/O base first
	194	*/
	195	io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	196	if (io_res == NULL) {
	197	io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	198	if (unlikely(io_res == NULL))
	199	return -EINVAL;
	200	}
	201
	202	/*
	203	* Then the CTL base
	204	*/
	205	ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
	206	if (ctl_res == NULL) {
	207	ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	208	if (unlikely(ctl_res == NULL))
	209	return -EINVAL;
	210	}
	211
	212	/*
	213	* And the IRQ
	214	*/
	215	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	216	if (irq_res)
	217	irq_res->flags = pp_info ? pp_info->irq_flags : 0;
	218
	219	return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res,
	220	pp_info ? pp_info->ioport_shift : 0,
	221	pio_mask);
	222	}
	223
a20c9e82 PM	224	static struct platform_driver pata_platform_driver = {
a20c9e82 PM	225	.probe = pata_platform_probe,
ccd1196a	226	.remove = ata_platform_remove_one,
a20c9e82 PM	227	.driver = {
	228	.name = DRV_NAME,
	229	.owner = THIS_MODULE,
	230	},
	231	};
	232
99c8ea3e	233	module_platform_driver(pata_platform_driver);
a20c9e82 PM	234
	235	module_param(pio_mask, int, 0);
	236
	237	MODULE_AUTHOR("Paul Mundt");
	238	MODULE_DESCRIPTION("low-level driver for platform device ATA");
	239	MODULE_LICENSE("GPL");
	240	MODULE_VERSION(DRV_VERSION);
458622fc	241	MODULE_ALIAS("platform:" DRV_NAME);