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

/*
 *	ACPI PATA driver
 *
 *	(c) 2007 Red Hat
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/gfp.h>
#include <scsi/scsi_host.h>
#include <acpi/acpi_bus.h>

#include <linux/libata.h>
#include <linux/ata.h>

#define DRV_NAME	"pata_acpi"
#define DRV_VERSION	"0.2.3"

struct pata_acpi {
	struct ata_acpi_gtm gtm;
	void *last;
	unsigned long mask[2];
};

/**
 *	pacpi_pre_reset	-	check for 40/80 pin
 *	@ap: Port
 *	@deadline: deadline jiffies for the operation
 *
 *	Perform the PATA port setup we need.
 */

static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline)
{
	struct ata_port *ap = link->ap;
	struct pata_acpi *acpi = ap->private_data;
	if (ap->acpi_handle == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0)
		return -ENODEV;

	return ata_sff_prereset(link, deadline);
}

/**
 *	pacpi_cable_detect	-	cable type detection
 *	@ap: port to detect
 *
 *	Perform device specific cable detection
 */

static int pacpi_cable_detect(struct ata_port *ap)
{
	struct pata_acpi *acpi = ap->private_data;

	if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA))
		return ATA_CBL_PATA80;
	else
		return ATA_CBL_PATA40;
}

/**
 *	pacpi_discover_modes	-	filter non ACPI modes
 *	@adev: ATA device
 *	@mask: proposed modes
 *
 *	Try the modes available and see which ones the ACPI method will
 *	set up sensibly. From this we get a mask of ACPI modes we can use
 */

static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev)
{
	struct pata_acpi *acpi = ap->private_data;
	struct ata_acpi_gtm probe;
	unsigned int xfer_mask;

	probe = acpi->gtm;

	ata_acpi_gtm(ap, &probe);

	xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);

	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
		ap->cbl = ATA_CBL_PATA80;

	return xfer_mask;
}

/**
 *	pacpi_mode_filter	-	mode filter for ACPI
 *	@adev: device
 *	@mask: mask of valid modes
 *
 *	Filter the valid mode list according to our own specific rules, in
 *	this case the list of discovered valid modes obtained by ACPI probing
 */

static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
{
	struct pata_acpi *acpi = adev->link->ap->private_data;
	return mask & acpi->mask[adev->devno];
}

/**
 *	pacpi_set_piomode	-	set initial PIO mode data
 *	@ap: ATA interface
 *	@adev: ATA device
 */

static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
	int unit = adev->devno;
	struct pata_acpi *acpi = ap->private_data;
	const struct ata_timing *t;

	if (!(acpi->gtm.flags & 0x10))
		unit = 0;

	/* Now stuff the nS values into the structure */
	t = ata_timing_find_mode(adev->pio_mode);
	acpi->gtm.drive[unit].pio = t->cycle;
	ata_acpi_stm(ap, &acpi->gtm);
	/* See what mode we actually got */
	ata_acpi_gtm(ap, &acpi->gtm);
}

/**
 *	pacpi_set_dmamode	-	set initial DMA mode data
 *	@ap: ATA interface
 *	@adev: ATA device
 */

static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
	int unit = adev->devno;
	struct pata_acpi *acpi = ap->private_data;
	const struct ata_timing *t;

	if (!(acpi->gtm.flags & 0x10))
		unit = 0;

	/* Now stuff the nS values into the structure */
	t = ata_timing_find_mode(adev->dma_mode);
	if (adev->dma_mode >= XFER_UDMA_0) {
		acpi->gtm.drive[unit].dma = t->udma;
		acpi->gtm.flags |= (1 << (2 * unit));
	} else {
		acpi->gtm.drive[unit].dma = t->cycle;
		acpi->gtm.flags &= ~(1 << (2 * unit));
	}
	ata_acpi_stm(ap, &acpi->gtm);
	/* See what mode we actually got */
	ata_acpi_gtm(ap, &acpi->gtm);
}

/**
 *	pacpi_qc_issue	-	command issue
 *	@qc: command pending
 *
 *	Called when the libata layer is about to issue a command. We wrap
 *	this interface so that we can load the correct ATA timings if
 *	necessary.
 */

static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	struct ata_device *adev = qc->dev;
	struct pata_acpi *acpi = ap->private_data;

	if (acpi->gtm.flags & 0x10)
		return ata_bmdma_qc_issue(qc);

	if (adev != acpi->last) {
		pacpi_set_piomode(ap, adev);
		if (ata_dma_enabled(adev))
			pacpi_set_dmamode(ap, adev);
		acpi->last = adev;
	}
	return ata_bmdma_qc_issue(qc);
}

/**
 *	pacpi_port_start	-	port setup
 *	@ap: ATA port being set up
 *
 *	Use the port_start hook to maintain private control structures
 */

static int pacpi_port_start(struct ata_port *ap)
{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	struct pata_acpi *acpi;

	int ret;

	if (ap->acpi_handle == NULL)
		return -ENODEV;

	acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
	if (ap->private_data == NULL)
		return -ENOMEM;
	acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]);
	acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]);
	ret = ata_bmdma_port_start(ap);
	if (ret < 0)
		return ret;

	return ret;
}

static struct scsi_host_template pacpi_sht = {
	ATA_BMDMA_SHT(DRV_NAME),
};

static struct ata_port_operations pacpi_ops = {
	.inherits		= &ata_bmdma_port_ops,
	.qc_issue		= pacpi_qc_issue,
	.cable_detect		= pacpi_cable_detect,
	.mode_filter		= pacpi_mode_filter,
	.set_piomode		= pacpi_set_piomode,
	.set_dmamode		= pacpi_set_dmamode,
	.prereset		= pacpi_pre_reset,
	.port_start		= pacpi_port_start,
};


/**
 *	pacpi_init_one - Register ACPI ATA PCI device with kernel services
 *	@pdev: PCI device to register
 *	@ent: Entry in pacpi_pci_tbl matching with @pdev
 *
 *	Called from kernel PCI layer.
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 *
 *	RETURNS:
 *	Zero on success, or -ERRNO value.
 */

static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
{
	static const struct ata_port_info info = {
		.flags		= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,

		.pio_mask	= ATA_PIO4,
		.mwdma_mask	= ATA_MWDMA2,
		.udma_mask 	= ATA_UDMA6,

		.port_ops	= &pacpi_ops,
	};
	const struct ata_port_info *ppi[] = { &info, NULL };
	if (pdev->vendor == PCI_VENDOR_ID_ATI) {
		int rc = pcim_enable_device(pdev);
		if (rc < 0)
			return rc;
		pcim_pin_device(pdev);
	}
	return ata_pci_bmdma_init_one(pdev, ppi, &pacpi_sht, NULL, 0);
}

static const struct pci_device_id pacpi_pci_tbl[] = {
	{ PCI_ANY_ID,		PCI_ANY_ID,			   PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
	{ }	/* terminate list */
};

static struct pci_driver pacpi_pci_driver = {
	.name			= DRV_NAME,
	.id_table		= pacpi_pci_tbl,
	.probe			= pacpi_init_one,
	.remove			= ata_pci_remove_one,
#ifdef CONFIG_PM
	.suspend		= ata_pci_device_suspend,
	.resume			= ata_pci_device_resume,
#endif
};

static int __init pacpi_init(void)
{
	return pci_register_driver(&pacpi_pci_driver);
}

static void __exit pacpi_exit(void)
{
	pci_unregister_driver(&pacpi_pci_driver);
}

module_init(pacpi_init);
module_exit(pacpi_exit);

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl);
MODULE_VERSION(DRV_VERSION);
Commit	Line	Data
025621f9 AC	1	/*
	2	* ACPI PATA driver
	3	*
ab771630	4	* (c) 2007 Red Hat
025621f9 AC	5	*/
	6
	7	#include <linux/kernel.h>
	8	#include <linux/module.h>
	9	#include <linux/pci.h>
	10	#include <linux/init.h>
	11	#include <linux/blkdev.h>
	12	#include <linux/delay.h>
	13	#include <linux/device.h>
5a0e3ad6	14	#include <linux/gfp.h>
025621f9 AC	15	#include <scsi/scsi_host.h>
025621f9 AC	16	#include <acpi/acpi_bus.h>
025621f9 AC	17
	18	#include <linux/libata.h>
	19	#include <linux/ata.h>
	20
	21	#define DRV_NAME "pata_acpi"
	22	#define DRV_VERSION "0.2.3"
	23
	24	struct pata_acpi {
	25	struct ata_acpi_gtm gtm;
	26	void *last;
	27	unsigned long mask[2];
	28	};
	29
	30	/**
	31	* pacpi_pre_reset - check for 40/80 pin
	32	* @ap: Port
	33	* @deadline: deadline jiffies for the operation
	34	*
	35	* Perform the PATA port setup we need.
	36	*/
	37
	38	static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline)
	39	{
	40	struct ata_port *ap = link->ap;
	41	struct pata_acpi *acpi = ap->private_data;
	42	if (ap->acpi_handle == NULL \|\| ata_acpi_gtm(ap, &acpi->gtm) < 0)
	43	return -ENODEV;
	44
9363c382	45	return ata_sff_prereset(link, deadline);
025621f9 AC	46	}
	47
	48	/**
	49	* pacpi_cable_detect - cable type detection
	50	* @ap: port to detect
	51	*
	52	* Perform device specific cable detection
	53	*/
	54
	55	static int pacpi_cable_detect(struct ata_port *ap)
	56	{
	57	struct pata_acpi *acpi = ap->private_data;
	58
	59	if ((acpi->mask[0] \| acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA))
	60	return ATA_CBL_PATA80;
	61	else
	62	return ATA_CBL_PATA40;
	63	}
	64
025621f9 AC	65	/**
	66	* pacpi_discover_modes - filter non ACPI modes
	67	* @adev: ATA device
	68	* @mask: proposed modes
	69	*
	70	* Try the modes available and see which ones the ACPI method will
	71	* set up sensibly. From this we get a mask of ACPI modes we can use
	72	*/
	73
	74	static unsigned long pacpi_discover_modes(struct ata_port ap, struct ata_device adev)
	75	{
025621f9	76	struct pata_acpi *acpi = ap->private_data;
025621f9	77	struct ata_acpi_gtm probe;
7c77fa4d	78	unsigned int xfer_mask;
025621f9 AC	79
	80	probe = acpi->gtm;
	81
025621f9 AC	82	ata_acpi_gtm(ap, &probe);
025621f9 AC	83
7c77fa4d	84	xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);
025621f9	85
7c77fa4d	86	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
025621f9	87	ap->cbl = ATA_CBL_PATA80;
7c77fa4d TH	88
7c77fa4d TH	89	return xfer_mask;
025621f9 AC	90	}
	91
	92	/**
	93	* pacpi_mode_filter - mode filter for ACPI
	94	* @adev: device
	95	* @mask: mask of valid modes
	96	*
	97	* Filter the valid mode list according to our own specific rules, in
	98	* this case the list of discovered valid modes obtained by ACPI probing
	99	*/
	100
	101	static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
	102	{
	103	struct pata_acpi *acpi = adev->link->ap->private_data;
c7087652	104	return mask & acpi->mask[adev->devno];
025621f9 AC	105	}
	106
	107	/**
	108	* pacpi_set_piomode - set initial PIO mode data
	109	* @ap: ATA interface
	110	* @adev: ATA device
	111	*/
	112
	113	static void pacpi_set_piomode(struct ata_port ap, struct ata_device adev)
	114	{
	115	int unit = adev->devno;
	116	struct pata_acpi *acpi = ap->private_data;
a0f79b92	117	const struct ata_timing *t;
025621f9	118
b447916e	119	if (!(acpi->gtm.flags & 0x10))
025621f9 AC	120	unit = 0;
	121
	122	/* Now stuff the nS values into the structure */
a0f79b92 TH	123	t = ata_timing_find_mode(adev->pio_mode);
a0f79b92 TH	124	acpi->gtm.drive[unit].pio = t->cycle;
025621f9 AC	125	ata_acpi_stm(ap, &acpi->gtm);
	126	/* See what mode we actually got */
	127	ata_acpi_gtm(ap, &acpi->gtm);
	128	}
	129
	130	/**
	131	* pacpi_set_dmamode - set initial DMA mode data
	132	* @ap: ATA interface
	133	* @adev: ATA device
	134	*/
	135
	136	static void pacpi_set_dmamode(struct ata_port ap, struct ata_device adev)
	137	{
	138	int unit = adev->devno;
	139	struct pata_acpi *acpi = ap->private_data;
a0f79b92	140	const struct ata_timing *t;
025621f9	141
b447916e	142	if (!(acpi->gtm.flags & 0x10))
025621f9 AC	143	unit = 0;
	144
	145	/* Now stuff the nS values into the structure */
a0f79b92	146	t = ata_timing_find_mode(adev->dma_mode);
025621f9	147	if (adev->dma_mode >= XFER_UDMA_0) {
a0f79b92	148	acpi->gtm.drive[unit].dma = t->udma;
025621f9 AC	149	acpi->gtm.flags \|= (1 << (2 * unit));
025621f9 AC	150	} else {
a0f79b92	151	acpi->gtm.drive[unit].dma = t->cycle;
025621f9 AC	152	acpi->gtm.flags &= ~(1 << (2 * unit));
	153	}
	154	ata_acpi_stm(ap, &acpi->gtm);
	155	/* See what mode we actually got */
	156	ata_acpi_gtm(ap, &acpi->gtm);
	157	}
	158
	159	/**
9363c382	160	* pacpi_qc_issue - command issue
025621f9 AC	161	* @qc: command pending
	162	*
	163	* Called when the libata layer is about to issue a command. We wrap
	164	* this interface so that we can load the correct ATA timings if
3ad2f3fb	165	* necessary.
025621f9 AC	166	*/
025621f9 AC	167
9363c382	168	static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc)
025621f9 AC	169	{
	170	struct ata_port *ap = qc->ap;
	171	struct ata_device *adev = qc->dev;
	172	struct pata_acpi *acpi = ap->private_data;
	173
	174	if (acpi->gtm.flags & 0x10)
360ff783	175	return ata_bmdma_qc_issue(qc);
025621f9 AC	176
	177	if (adev != acpi->last) {
	178	pacpi_set_piomode(ap, adev);
b15b3eba	179	if (ata_dma_enabled(adev))
025621f9 AC	180	pacpi_set_dmamode(ap, adev);
	181	acpi->last = adev;
	182	}
360ff783	183	return ata_bmdma_qc_issue(qc);
025621f9 AC	184	}
	185
	186	/**
	187	* pacpi_port_start - port setup
	188	* @ap: ATA port being set up
	189	*
	190	* Use the port_start hook to maintain private control structures
	191	*/
	192
	193	static int pacpi_port_start(struct ata_port *ap)
	194	{
	195	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	196	struct pata_acpi *acpi;
	197
	198	int ret;
	199
	200	if (ap->acpi_handle == NULL)
	201	return -ENODEV;
	202
	203	acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
	204	if (ap->private_data == NULL)
	205	return -ENOMEM;
	206	acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]);
	207	acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]);
c7087652	208	ret = ata_bmdma_port_start(ap);
025621f9 AC	209	if (ret < 0)
	210	return ret;
	211
	212	return ret;
	213	}
	214
	215	static struct scsi_host_template pacpi_sht = {
68d1d07b	216	ATA_BMDMA_SHT(DRV_NAME),
025621f9 AC	217	};
025621f9 AC	218
029cfd6b TH	219	static struct ata_port_operations pacpi_ops = {
029cfd6b TH	220	.inherits = &ata_bmdma_port_ops,
9363c382	221	.qc_issue = pacpi_qc_issue,
029cfd6b TH	222	.cable_detect = pacpi_cable_detect,
029cfd6b TH	223	.mode_filter = pacpi_mode_filter,
025621f9 AC	224	.set_piomode = pacpi_set_piomode,
025621f9 AC	225	.set_dmamode = pacpi_set_dmamode,
887125e3	226	.prereset = pacpi_pre_reset,
025621f9 AC	227	.port_start = pacpi_port_start,
	228	};
	229
	230
	231	/**
	232	* pacpi_init_one - Register ACPI ATA PCI device with kernel services
	233	* @pdev: PCI device to register
	234	* @ent: Entry in pacpi_pci_tbl matching with @pdev
	235	*
	236	* Called from kernel PCI layer.
	237	*
	238	* LOCKING:
	239	* Inherited from PCI layer (may sleep).
	240	*
	241	* RETURNS:
	242	* Zero on success, or -ERRNO value.
	243	*/
	244
	245	static int pacpi_init_one (struct pci_dev pdev, const struct pci_device_id id)
	246	{
	247	static const struct ata_port_info info = {
025621f9 AC	248	.flags = ATA_FLAG_SLAVE_POSS \| ATA_FLAG_SRST,
025621f9 AC	249
14bdef98 EIB	250	.pio_mask = ATA_PIO4,
	251	.mwdma_mask = ATA_MWDMA2,
	252	.udma_mask = ATA_UDMA6,
025621f9 AC	253
	254	.port_ops = &pacpi_ops,
	255	};
	256	const struct ata_port_info *ppi[] = { &info, NULL };
05177f17 AC	257	if (pdev->vendor == PCI_VENDOR_ID_ATI) {
	258	int rc = pcim_enable_device(pdev);
	259	if (rc < 0)
	260	return rc;
	261	pcim_pin_device(pdev);
	262	}
1c5afdf7	263	return ata_pci_bmdma_init_one(pdev, ppi, &pacpi_sht, NULL, 0);
025621f9 AC	264	}
	265
	266	static const struct pci_device_id pacpi_pci_tbl[] = {
	267	{ PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
	268	{ } /* terminate list */
	269	};
	270
	271	static struct pci_driver pacpi_pci_driver = {
	272	.name = DRV_NAME,
	273	.id_table = pacpi_pci_tbl,
	274	.probe = pacpi_init_one,
	275	.remove = ata_pci_remove_one,
8e2840e0	276	#ifdef CONFIG_PM
025621f9 AC	277	.suspend = ata_pci_device_suspend,
025621f9 AC	278	.resume = ata_pci_device_resume,
8e2840e0	279	#endif
025621f9 AC	280	};
	281
	282	static int __init pacpi_init(void)
	283	{
	284	return pci_register_driver(&pacpi_pci_driver);
	285	}
	286
	287	static void __exit pacpi_exit(void)
	288	{
	289	pci_unregister_driver(&pacpi_pci_driver);
	290	}
	291
	292	module_init(pacpi_init);
	293	module_exit(pacpi_exit);
	294
	295	MODULE_AUTHOR("Alan Cox");
	296	MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode");
	297	MODULE_LICENSE("GPL");
	298	MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl);
	299	MODULE_VERSION(DRV_VERSION);
	300