[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 <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 ata_bmdma_mode_filter(adev, 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
 *	neccessary.
 */

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_sff_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_sff_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_sff_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	= 0x1f,
		.mwdma_mask	= 0x07,
		.udma_mask 	= 0x7f,

		.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_sff_init_one(pdev, ppi, &pacpi_sht, NULL);
}

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>
	14	#include <scsi/scsi_host.h>
	15	#include <acpi/acpi_bus.h>
025621f9 AC	16
	17	#include <linux/libata.h>
	18	#include <linux/ata.h>
	19
	20	#define DRV_NAME "pata_acpi"
	21	#define DRV_VERSION "0.2.3"
	22
	23	struct pata_acpi {
	24	struct ata_acpi_gtm gtm;
	25	void *last;
	26	unsigned long mask[2];
	27	};
	28
	29	/**
	30	* pacpi_pre_reset - check for 40/80 pin
	31	* @ap: Port
	32	* @deadline: deadline jiffies for the operation
	33	*
	34	* Perform the PATA port setup we need.
	35	*/
	36
	37	static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline)
	38	{
	39	struct ata_port *ap = link->ap;
	40	struct pata_acpi *acpi = ap->private_data;
	41	if (ap->acpi_handle == NULL \|\| ata_acpi_gtm(ap, &acpi->gtm) < 0)
	42	return -ENODEV;
	43
9363c382	44	return ata_sff_prereset(link, deadline);
025621f9 AC	45	}
	46
	47	/**
	48	* pacpi_cable_detect - cable type detection
	49	* @ap: port to detect
	50	*
	51	* Perform device specific cable detection
	52	*/
	53
	54	static int pacpi_cable_detect(struct ata_port *ap)
	55	{
	56	struct pata_acpi *acpi = ap->private_data;
	57
	58	if ((acpi->mask[0] \| acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA))
	59	return ATA_CBL_PATA80;
	60	else
	61	return ATA_CBL_PATA40;
	62	}
	63
025621f9 AC	64	/**
	65	* pacpi_discover_modes - filter non ACPI modes
	66	* @adev: ATA device
	67	* @mask: proposed modes
	68	*
	69	* Try the modes available and see which ones the ACPI method will
	70	* set up sensibly. From this we get a mask of ACPI modes we can use
	71	*/
	72
	73	static unsigned long pacpi_discover_modes(struct ata_port ap, struct ata_device adev)
	74	{
025621f9	75	struct pata_acpi *acpi = ap->private_data;
025621f9	76	struct ata_acpi_gtm probe;
7c77fa4d	77	unsigned int xfer_mask;
025621f9 AC	78
	79	probe = acpi->gtm;
	80
025621f9 AC	81	ata_acpi_gtm(ap, &probe);
025621f9 AC	82
7c77fa4d	83	xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);
025621f9	84
7c77fa4d	85	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
025621f9	86	ap->cbl = ATA_CBL_PATA80;
7c77fa4d TH	87
7c77fa4d TH	88	return xfer_mask;
025621f9 AC	89	}
	90
	91	/**
	92	* pacpi_mode_filter - mode filter for ACPI
	93	* @adev: device
	94	* @mask: mask of valid modes
	95	*
	96	* Filter the valid mode list according to our own specific rules, in
	97	* this case the list of discovered valid modes obtained by ACPI probing
	98	*/
	99
	100	static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
	101	{
	102	struct pata_acpi *acpi = adev->link->ap->private_data;
9363c382	103	return ata_bmdma_mode_filter(adev, mask & acpi->mask[adev->devno]);
025621f9 AC	104	}
	105
	106	/**
	107	* pacpi_set_piomode - set initial PIO mode data
	108	* @ap: ATA interface
	109	* @adev: ATA device
	110	*/
	111
	112	static void pacpi_set_piomode(struct ata_port ap, struct ata_device adev)
	113	{
	114	int unit = adev->devno;
	115	struct pata_acpi *acpi = ap->private_data;
a0f79b92	116	const struct ata_timing *t;
025621f9	117
b447916e	118	if (!(acpi->gtm.flags & 0x10))
025621f9 AC	119	unit = 0;
	120
	121	/* Now stuff the nS values into the structure */
a0f79b92 TH	122	t = ata_timing_find_mode(adev->pio_mode);
a0f79b92 TH	123	acpi->gtm.drive[unit].pio = t->cycle;
025621f9 AC	124	ata_acpi_stm(ap, &acpi->gtm);
	125	/* See what mode we actually got */
	126	ata_acpi_gtm(ap, &acpi->gtm);
	127	}
	128
	129	/**
	130	* pacpi_set_dmamode - set initial DMA mode data
	131	* @ap: ATA interface
	132	* @adev: ATA device
	133	*/
	134
	135	static void pacpi_set_dmamode(struct ata_port ap, struct ata_device adev)
	136	{
	137	int unit = adev->devno;
	138	struct pata_acpi *acpi = ap->private_data;
a0f79b92	139	const struct ata_timing *t;
025621f9	140
b447916e	141	if (!(acpi->gtm.flags & 0x10))
025621f9 AC	142	unit = 0;
	143
	144	/* Now stuff the nS values into the structure */
a0f79b92	145	t = ata_timing_find_mode(adev->dma_mode);
025621f9	146	if (adev->dma_mode >= XFER_UDMA_0) {
a0f79b92	147	acpi->gtm.drive[unit].dma = t->udma;
025621f9 AC	148	acpi->gtm.flags \|= (1 << (2 * unit));
025621f9 AC	149	} else {
a0f79b92	150	acpi->gtm.drive[unit].dma = t->cycle;
025621f9 AC	151	acpi->gtm.flags &= ~(1 << (2 * unit));
	152	}
	153	ata_acpi_stm(ap, &acpi->gtm);
	154	/* See what mode we actually got */
	155	ata_acpi_gtm(ap, &acpi->gtm);
	156	}
	157
	158	/**
9363c382	159	* pacpi_qc_issue - command issue
025621f9 AC	160	* @qc: command pending
	161	*
	162	* Called when the libata layer is about to issue a command. We wrap
	163	* this interface so that we can load the correct ATA timings if
	164	* neccessary.
	165	*/
	166
9363c382	167	static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc)
025621f9 AC	168	{
	169	struct ata_port *ap = qc->ap;
	170	struct ata_device *adev = qc->dev;
	171	struct pata_acpi *acpi = ap->private_data;
	172
	173	if (acpi->gtm.flags & 0x10)
9363c382	174	return ata_sff_qc_issue(qc);
025621f9 AC	175
	176	if (adev != acpi->last) {
	177	pacpi_set_piomode(ap, adev);
b15b3eba	178	if (ata_dma_enabled(adev))
025621f9 AC	179	pacpi_set_dmamode(ap, adev);
	180	acpi->last = adev;
	181	}
9363c382	182	return ata_sff_qc_issue(qc);
025621f9 AC	183	}
	184
	185	/**
	186	* pacpi_port_start - port setup
	187	* @ap: ATA port being set up
	188	*
	189	* Use the port_start hook to maintain private control structures
	190	*/
	191
	192	static int pacpi_port_start(struct ata_port *ap)
	193	{
	194	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	195	struct pata_acpi *acpi;
	196
	197	int ret;
	198
	199	if (ap->acpi_handle == NULL)
	200	return -ENODEV;
	201
	202	acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
	203	if (ap->private_data == NULL)
	204	return -ENOMEM;
	205	acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]);
	206	acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]);
	207	ret = ata_sff_port_start(ap);
	208	if (ret < 0)
	209	return ret;
	210
	211	return ret;
	212	}
	213
	214	static struct scsi_host_template pacpi_sht = {
68d1d07b	215	ATA_BMDMA_SHT(DRV_NAME),
025621f9 AC	216	};
025621f9 AC	217
029cfd6b TH	218	static struct ata_port_operations pacpi_ops = {
029cfd6b TH	219	.inherits = &ata_bmdma_port_ops,
9363c382	220	.qc_issue = pacpi_qc_issue,
029cfd6b TH	221	.cable_detect = pacpi_cable_detect,
029cfd6b TH	222	.mode_filter = pacpi_mode_filter,
025621f9 AC	223	.set_piomode = pacpi_set_piomode,
025621f9 AC	224	.set_dmamode = pacpi_set_dmamode,
887125e3	225	.prereset = pacpi_pre_reset,
025621f9 AC	226	.port_start = pacpi_port_start,
	227	};
	228
	229
	230	/**
	231	* pacpi_init_one - Register ACPI ATA PCI device with kernel services
	232	* @pdev: PCI device to register
	233	* @ent: Entry in pacpi_pci_tbl matching with @pdev
	234	*
	235	* Called from kernel PCI layer.
	236	*
	237	* LOCKING:
	238	* Inherited from PCI layer (may sleep).
	239	*
	240	* RETURNS:
	241	* Zero on success, or -ERRNO value.
	242	*/
	243
	244	static int pacpi_init_one (struct pci_dev pdev, const struct pci_device_id id)
	245	{
	246	static const struct ata_port_info info = {
025621f9 AC	247	.flags = ATA_FLAG_SLAVE_POSS \| ATA_FLAG_SRST,
	248
	249	.pio_mask = 0x1f,
	250	.mwdma_mask = 0x07,
	251	.udma_mask = 0x7f,
	252
	253	.port_ops = &pacpi_ops,
	254	};
	255	const struct ata_port_info *ppi[] = { &info, NULL };
05177f17 AC	256	if (pdev->vendor == PCI_VENDOR_ID_ATI) {
	257	int rc = pcim_enable_device(pdev);
	258	if (rc < 0)
	259	return rc;
	260	pcim_pin_device(pdev);
	261	}
9363c382	262	return ata_pci_sff_init_one(pdev, ppi, &pacpi_sht, NULL);
025621f9 AC	263	}
	264
	265	static const struct pci_device_id pacpi_pci_tbl[] = {
	266	{ PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
	267	{ } /* terminate list */
	268	};
	269
	270	static struct pci_driver pacpi_pci_driver = {
	271	.name = DRV_NAME,
	272	.id_table = pacpi_pci_tbl,
	273	.probe = pacpi_init_one,
	274	.remove = ata_pci_remove_one,
8e2840e0	275	#ifdef CONFIG_PM
025621f9 AC	276	.suspend = ata_pci_device_suspend,
025621f9 AC	277	.resume = ata_pci_device_resume,
8e2840e0	278	#endif
025621f9 AC	279	};
	280
	281	static int __init pacpi_init(void)
	282	{
	283	return pci_register_driver(&pacpi_pci_driver);
	284	}
	285
	286	static void __exit pacpi_exit(void)
	287	{
	288	pci_unregister_driver(&pacpi_pci_driver);
	289	}
	290
	291	module_init(pacpi_init);
	292	module_exit(pacpi_exit);
	293
	294	MODULE_AUTHOR("Alan Cox");
	295	MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode");
	296	MODULE_LICENSE("GPL");
	297	MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl);
	298	MODULE_VERSION(DRV_VERSION);
	299