[net-next-2.6.git] / drivers / ata / ahci_platform.c

/*
 * AHCI SATA platform driver
 *
 * Copyright 2004-2005  Red Hat, Inc.
 *   Jeff Garzik <jgarzik@pobox.com>
 * Copyright 2010  MontaVista Software, LLC.
 *   Anton Vorontsov <avorontsov@ru.mvista.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 */

#include <linux/kernel.h>
#include <linux/gfp.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/libata.h>
#include <linux/ahci_platform.h>
#include "ahci.h"

static int __init ahci_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct ahci_platform_data *pdata = dev->platform_data;
	struct ata_port_info pi = {
		.flags		= AHCI_FLAG_COMMON,
		.pio_mask	= ATA_PIO4,
		.udma_mask	= ATA_UDMA6,
		.port_ops	= &ahci_ops,
	};
	const struct ata_port_info *ppi[] = { &pi, NULL };
	struct ahci_host_priv *hpriv;
	struct ata_host *host;
	struct resource *mem;
	int irq;
	int n_ports;
	int i;
	int rc;

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem) {
		dev_err(dev, "no mmio space\n");
		return -EINVAL;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq <= 0) {
		dev_err(dev, "no irq\n");
		return -EINVAL;
	}

	if (pdata && pdata->ata_port_info)
		pi = *pdata->ata_port_info;

	hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
	if (!hpriv) {
		dev_err(dev, "can't alloc ahci_host_priv\n");
		return -ENOMEM;
	}

	hpriv->flags |= (unsigned long)pi.private_data;

	hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
	if (!hpriv->mmio) {
		dev_err(dev, "can't map %pR\n", mem);
		return -ENOMEM;
	}

	/*
	 * Some platforms might need to prepare for mmio region access,
	 * which could be done in the following init call. So, the mmio
	 * region shouldn't be accessed before init (if provided) has
	 * returned successfully.
	 */
	if (pdata && pdata->init) {
		rc = pdata->init(dev, hpriv->mmio);
		if (rc)
			return rc;
	}

	ahci_save_initial_config(dev, hpriv,
		pdata ? pdata->force_port_map : 0,
		pdata ? pdata->mask_port_map  : 0);

	/* prepare host */
	if (hpriv->cap & HOST_CAP_NCQ)
		pi.flags |= ATA_FLAG_NCQ;

	if (hpriv->cap & HOST_CAP_PMP)
		pi.flags |= ATA_FLAG_PMP;

	ahci_set_em_messages(hpriv, &pi);

	/* CAP.NP sometimes indicate the index of the last enabled
	 * port, at other times, that of the last possible port, so
	 * determining the maximum port number requires looking at
	 * both CAP.NP and port_map.
	 */
	n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));

	host = ata_host_alloc_pinfo(dev, ppi, n_ports);
	if (!host) {
		rc = -ENOMEM;
		goto err0;
	}

	host->private_data = hpriv;

	if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
		host->flags |= ATA_HOST_PARALLEL_SCAN;
	else
		printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n");

	if (pi.flags & ATA_FLAG_EM)
		ahci_reset_em(host);

	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

		ata_port_desc(ap, "mmio %pR", mem);
		ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);

		/* set initial link pm policy */
		ap->pm_policy = NOT_AVAILABLE;

		/* set enclosure management message type */
		if (ap->flags & ATA_FLAG_EM)
			ap->em_message_type = hpriv->em_msg_type;

		/* disabled/not-implemented port */
		if (!(hpriv->port_map & (1 << i)))
			ap->ops = &ata_dummy_port_ops;
	}

	rc = ahci_reset_controller(host);
	if (rc)
		goto err0;

	ahci_init_controller(host);
	ahci_print_info(host, "platform");

	rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
			       &ahci_sht);
	if (rc)
		goto err0;

	return 0;
err0:
	if (pdata && pdata->exit)
		pdata->exit(dev);
	return rc;
}

static int __devexit ahci_remove(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct ahci_platform_data *pdata = dev->platform_data;
	struct ata_host *host = dev_get_drvdata(dev);

	ata_host_detach(host);

	if (pdata && pdata->exit)
		pdata->exit(dev);

	return 0;
}

static struct platform_driver ahci_driver = {
	.remove = __devexit_p(ahci_remove),
	.driver = {
		.name = "ahci",
		.owner = THIS_MODULE,
	},
};

static int __init ahci_init(void)
{
	return platform_driver_probe(&ahci_driver, ahci_probe);
}
module_init(ahci_init);

static void __exit ahci_exit(void)
{
	platform_driver_unregister(&ahci_driver);
}
module_exit(ahci_exit);

MODULE_DESCRIPTION("AHCI SATA platform driver");
MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:ahci");
Commit	Line	Data
1c2a49f6 AV	1	/*
	2	* AHCI SATA platform driver
	3	*
	4	* Copyright 2004-2005 Red Hat, Inc.
	5	* Jeff Garzik <jgarzik@pobox.com>
	6	* Copyright 2010 MontaVista Software, LLC.
	7	* Anton Vorontsov <avorontsov@ru.mvista.com>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2, or (at your option)
	12	* any later version.
	13	*/
	14
	15	#include <linux/kernel.h>
fbaf666b	16	#include <linux/gfp.h>
1c2a49f6 AV	17	#include <linux/module.h>
	18	#include <linux/init.h>
	19	#include <linux/interrupt.h>
	20	#include <linux/device.h>
	21	#include <linux/platform_device.h>
	22	#include <linux/libata.h>
	23	#include <linux/ahci_platform.h>
	24	#include "ahci.h"
	25
	26	static int __init ahci_probe(struct platform_device *pdev)
	27	{
	28	struct device *dev = &pdev->dev;
	29	struct ahci_platform_data *pdata = dev->platform_data;
	30	struct ata_port_info pi = {
	31	.flags = AHCI_FLAG_COMMON,
	32	.pio_mask = ATA_PIO4,
	33	.udma_mask = ATA_UDMA6,
	34	.port_ops = &ahci_ops,
	35	};
	36	const struct ata_port_info *ppi[] = { &pi, NULL };
	37	struct ahci_host_priv *hpriv;
	38	struct ata_host *host;
	39	struct resource *mem;
	40	int irq;
	41	int n_ports;
	42	int i;
	43	int rc;
	44
	45	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	46	if (!mem) {
	47	dev_err(dev, "no mmio space\n");
	48	return -EINVAL;
	49	}
	50
	51	irq = platform_get_irq(pdev, 0);
	52	if (irq <= 0) {
	53	dev_err(dev, "no irq\n");
	54	return -EINVAL;
	55	}
	56
1c2a49f6 AV	57	if (pdata && pdata->ata_port_info)
	58	pi = *pdata->ata_port_info;
	59
	60	hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
	61	if (!hpriv) {
08354809 JB	62	dev_err(dev, "can't alloc ahci_host_priv\n");
08354809 JB	63	return -ENOMEM;
1c2a49f6 AV	64	}
	65
	66	hpriv->flags \|= (unsigned long)pi.private_data;
	67
	68	hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
	69	if (!hpriv->mmio) {
	70	dev_err(dev, "can't map %pR\n", mem);
08354809 JB	71	return -ENOMEM;
	72	}
	73
	74	/*
	75	* Some platforms might need to prepare for mmio region access,
	76	* which could be done in the following init call. So, the mmio
	77	* region shouldn't be accessed before init (if provided) has
	78	* returned successfully.
	79	*/
	80	if (pdata && pdata->init) {
	81	rc = pdata->init(dev, hpriv->mmio);
	82	if (rc)
	83	return rc;
1c2a49f6 AV	84	}
	85
	86	ahci_save_initial_config(dev, hpriv,
	87	pdata ? pdata->force_port_map : 0,
	88	pdata ? pdata->mask_port_map : 0);
	89
	90	/* prepare host */
	91	if (hpriv->cap & HOST_CAP_NCQ)
	92	pi.flags \|= ATA_FLAG_NCQ;
	93
	94	if (hpriv->cap & HOST_CAP_PMP)
	95	pi.flags \|= ATA_FLAG_PMP;
	96
	97	ahci_set_em_messages(hpriv, &pi);
	98
	99	/* CAP.NP sometimes indicate the index of the last enabled
	100	* port, at other times, that of the last possible port, so
	101	* determining the maximum port number requires looking at
	102	* both CAP.NP and port_map.
	103	*/
	104	n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
	105
	106	host = ata_host_alloc_pinfo(dev, ppi, n_ports);
	107	if (!host) {
	108	rc = -ENOMEM;
	109	goto err0;
	110	}
	111
	112	host->private_data = hpriv;
	113
	114	if (!(hpriv->cap & HOST_CAP_SSS) \|\| ahci_ignore_sss)
	115	host->flags \|= ATA_HOST_PARALLEL_SCAN;
	116	else
	117	printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n");
	118
	119	if (pi.flags & ATA_FLAG_EM)
	120	ahci_reset_em(host);
	121
	122	for (i = 0; i < host->n_ports; i++) {
	123	struct ata_port *ap = host->ports[i];
	124
	125	ata_port_desc(ap, "mmio %pR", mem);
	126	ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
	127
	128	/* set initial link pm policy */
	129	ap->pm_policy = NOT_AVAILABLE;
	130
	131	/* set enclosure management message type */
	132	if (ap->flags & ATA_FLAG_EM)
55787183	133	ap->em_message_type = hpriv->em_msg_type;
1c2a49f6 AV	134
	135	/* disabled/not-implemented port */
	136	if (!(hpriv->port_map & (1 << i)))
	137	ap->ops = &ata_dummy_port_ops;
	138	}
	139
	140	rc = ahci_reset_controller(host);
	141	if (rc)
	142	goto err0;
	143
	144	ahci_init_controller(host);
	145	ahci_print_info(host, "platform");
	146
	147	rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
	148	&ahci_sht);
	149	if (rc)
	150	goto err0;
	151
	152	return 0;
	153	err0:
	154	if (pdata && pdata->exit)
	155	pdata->exit(dev);
	156	return rc;
	157	}
	158
	159	static int __devexit ahci_remove(struct platform_device *pdev)
	160	{
	161	struct device *dev = &pdev->dev;
	162	struct ahci_platform_data *pdata = dev->platform_data;
	163	struct ata_host *host = dev_get_drvdata(dev);
	164
	165	ata_host_detach(host);
	166
	167	if (pdata && pdata->exit)
	168	pdata->exit(dev);
	169
	170	return 0;
	171	}
	172
	173	static struct platform_driver ahci_driver = {
1c2a49f6 AV	174	.remove = __devexit_p(ahci_remove),
	175	.driver = {
	176	.name = "ahci",
	177	.owner = THIS_MODULE,
	178	},
	179	};
	180
	181	static int __init ahci_init(void)
	182	{
	183	return platform_driver_probe(&ahci_driver, ahci_probe);
	184	}
	185	module_init(ahci_init);
	186
	187	static void __exit ahci_exit(void)
	188	{
	189	platform_driver_unregister(&ahci_driver);
	190	}
	191	module_exit(ahci_exit);
	192
	193	MODULE_DESCRIPTION("AHCI SATA platform driver");
	194	MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
	195	MODULE_LICENSE("GPL");
	196	MODULE_ALIAS("platform:ahci");