[mirror_ubuntu-bionic-kernel.git] / drivers / ata / pata_efar.c

/*
 *    pata_efar.c - EFAR PIIX clone controller driver
 *
 *	(C) 2005 Red Hat
 *	(C) 2009-2010 Bartlomiej Zolnierkiewicz
 *
 *    Some parts based on ata_piix.c by Jeff Garzik and others.
 *
 *    The EFAR is a PIIX4 clone with UDMA66 support. Unlike the later
 *    Intel ICH controllers the EFAR widened the UDMA mode register bits
 *    and doesn't require the funky clock selection.
 */

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

#define DRV_NAME	"pata_efar"
#define DRV_VERSION	"0.4.5"

/**
 *	efar_pre_reset	-	Enable bits
 *	@link: ATA link
 *	@deadline: deadline jiffies for the operation
 *
 *	Perform cable detection for the EFAR ATA interface. This is
 *	different to the PIIX arrangement
 */

static int efar_pre_reset(struct ata_link *link, unsigned long deadline)
{
	static const struct pci_bits efar_enable_bits[] = {
		{ 0x41U, 1U, 0x80UL, 0x80UL },	/* port 0 */
		{ 0x43U, 1U, 0x80UL, 0x80UL },	/* port 1 */
	};
	struct ata_port *ap = link->ap;
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);

	if (!pci_test_config_bits(pdev, &efar_enable_bits[ap->port_no]))
		return -ENOENT;

	return ata_sff_prereset(link, deadline);
}

/**
 *	efar_cable_detect	-	check for 40/80 pin
 *	@ap: Port
 *
 *	Perform cable detection for the EFAR ATA interface. This is
 *	different to the PIIX arrangement
 */

static int efar_cable_detect(struct ata_port *ap)
{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	u8 tmp;

	pci_read_config_byte(pdev, 0x47, &tmp);
	if (tmp & (2 >> ap->port_no))
		return ATA_CBL_PATA40;
	return ATA_CBL_PATA80;
}

/**
 *	efar_set_piomode - Initialize host controller PATA PIO timings
 *	@ap: Port whose timings we are configuring
 *	@adev: um
 *
 *	Set PIO mode for device, in host controller PCI config space.
 *
 *	LOCKING:
 *	None (inherited from caller).
 */

static void efar_set_piomode (struct ata_port *ap, struct ata_device *adev)
{
	unsigned int pio	= adev->pio_mode - XFER_PIO_0;
	struct pci_dev *dev	= to_pci_dev(ap->host->dev);
	unsigned int idetm_port= ap->port_no ? 0x42 : 0x40;
	u16 idetm_data;
	int control = 0;

	/*
	 *	See Intel Document 298600-004 for the timing programing rules
	 *	for PIIX/ICH. The EFAR is a clone so very similar
	 */

	static const	 /* ISP  RTC */
	u8 timings[][2]	= { { 0, 0 },
			    { 0, 0 },
			    { 1, 0 },
			    { 2, 1 },
			    { 2, 3 }, };

	if (pio > 1)
		control |= 1;	/* TIME */
	if (ata_pio_need_iordy(adev))	/* PIO 3/4 require IORDY */
		control |= 2;	/* IE */
	/* Intel specifies that the prefetch/posting is for disk only */
	if (adev->class == ATA_DEV_ATA)
		control |= 4;	/* PPE */

	pci_read_config_word(dev, idetm_port, &idetm_data);

	/* Set PPE, IE, and TIME as appropriate */
	if (adev->devno == 0) {
		idetm_data &= 0xCCF0;
		idetm_data |= control;
		idetm_data |= (timings[pio][0] << 12) |
			(timings[pio][1] << 8);
	} else {
		int shift = 4 * ap->port_no;
		u8 slave_data;

		idetm_data &= 0xFF0F;
		idetm_data |= (control << 4);

		/* Slave timing in separate register */
		pci_read_config_byte(dev, 0x44, &slave_data);
		slave_data &= ap->port_no ? 0x0F : 0xF0;
		slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << shift;
		pci_write_config_byte(dev, 0x44, slave_data);
	}

	idetm_data |= 0x4000;	/* Ensure SITRE is set */
	pci_write_config_word(dev, idetm_port, idetm_data);
}

/**
 *	efar_set_dmamode - Initialize host controller PATA DMA timings
 *	@ap: Port whose timings we are configuring
 *	@adev: Device to program
 *
 *	Set UDMA/MWDMA mode for device, in host controller PCI config space.
 *
 *	LOCKING:
 *	None (inherited from caller).
 */

static void efar_set_dmamode (struct ata_port *ap, struct ata_device *adev)
{
	struct pci_dev *dev	= to_pci_dev(ap->host->dev);
	u8 master_port		= ap->port_no ? 0x42 : 0x40;
	u16 master_data;
	u8 speed		= adev->dma_mode;
	int devid		= adev->devno + 2 * ap->port_no;
	u8 udma_enable;

	static const	 /* ISP  RTC */
	u8 timings[][2]	= { { 0, 0 },
			    { 0, 0 },
			    { 1, 0 },
			    { 2, 1 },
			    { 2, 3 }, };

	pci_read_config_word(dev, master_port, &master_data);
	pci_read_config_byte(dev, 0x48, &udma_enable);

	if (speed >= XFER_UDMA_0) {
		unsigned int udma	= adev->dma_mode - XFER_UDMA_0;
		u16 udma_timing;

		udma_enable |= (1 << devid);

		/* Load the UDMA mode number */
		pci_read_config_word(dev, 0x4A, &udma_timing);
		udma_timing &= ~(7 << (4 * devid));
		udma_timing |= udma << (4 * devid);
		pci_write_config_word(dev, 0x4A, udma_timing);
	} else {
		/*
		 * MWDMA is driven by the PIO timings. We must also enable
		 * IORDY unconditionally along with TIME1. PPE has already
		 * been set when the PIO timing was set.
		 */
		unsigned int mwdma	= adev->dma_mode - XFER_MW_DMA_0;
		unsigned int control;
		u8 slave_data;
		const unsigned int needed_pio[3] = {
			XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
		};
		int pio = needed_pio[mwdma] - XFER_PIO_0;

		control = 3;	/* IORDY|TIME1 */

		/* If the drive MWDMA is faster than it can do PIO then
		   we must force PIO into PIO0 */

		if (adev->pio_mode < needed_pio[mwdma])
			/* Enable DMA timing only */
			control |= 8;	/* PIO cycles in PIO0 */

		if (adev->devno) {	/* Slave */
			master_data &= 0xFF4F;  /* Mask out IORDY|TIME1|DMAONLY */
			master_data |= control << 4;
			pci_read_config_byte(dev, 0x44, &slave_data);
			slave_data &= ap->port_no ? 0x0F : 0xF0;
			/* Load the matching timing */
			slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0);
			pci_write_config_byte(dev, 0x44, slave_data);
		} else { 	/* Master */
			master_data &= 0xCCF4;	/* Mask out IORDY|TIME1|DMAONLY
						   and master timing bits */
			master_data |= control;
			master_data |=
				(timings[pio][0] << 12) |
				(timings[pio][1] << 8);
		}
		udma_enable &= ~(1 << devid);
		pci_write_config_word(dev, master_port, master_data);
	}
	pci_write_config_byte(dev, 0x48, udma_enable);
}

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

static struct ata_port_operations efar_ops = {
	.inherits		= &ata_bmdma_port_ops,
	.cable_detect		= efar_cable_detect,
	.set_piomode		= efar_set_piomode,
	.set_dmamode		= efar_set_dmamode,
	.prereset		= efar_pre_reset,
};


/**
 *	efar_init_one - Register EFAR ATA PCI device with kernel services
 *	@pdev: PCI device to register
 *	@ent: Entry in efar_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 efar_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
{
	static int printed_version;
	static const struct ata_port_info info = {
		.flags		= ATA_FLAG_SLAVE_POSS,
		.pio_mask	= ATA_PIO4,
		.mwdma_mask	= ATA_MWDMA12_ONLY,
		.udma_mask 	= ATA_UDMA4,
		.port_ops	= &efar_ops,
	};
	const struct ata_port_info *ppi[] = { &info, &info };

	if (!printed_version++)
		dev_printk(KERN_DEBUG, &pdev->dev,
			   "version " DRV_VERSION "\n");

	return ata_pci_sff_init_one(pdev, ppi, &efar_sht, NULL);
}

static const struct pci_device_id efar_pci_tbl[] = {
	{ PCI_VDEVICE(EFAR, 0x9130), },

	{ }	/* terminate list */
};

static struct pci_driver efar_pci_driver = {
	.name			= DRV_NAME,
	.id_table		= efar_pci_tbl,
	.probe			= efar_init_one,
	.remove			= ata_pci_remove_one,
#ifdef CONFIG_PM
	.suspend		= ata_pci_device_suspend,
	.resume			= ata_pci_device_resume,
#endif
};

static int __init efar_init(void)
{
	return pci_register_driver(&efar_pci_driver);
}

static void __exit efar_exit(void)
{
	pci_unregister_driver(&efar_pci_driver);
}

module_init(efar_init);
module_exit(efar_exit);

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("SCSI low-level driver for EFAR PIIX clones");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, efar_pci_tbl);
MODULE_VERSION(DRV_VERSION);
Commit	Line	Data
669a5db4 JG	1	/*
	2	* pata_efar.c - EFAR PIIX clone controller driver
	3	*
ab771630	4	* (C) 2005 Red Hat
73e2e3d0	5	* (C) 2009-2010 Bartlomiej Zolnierkiewicz
669a5db4 JG	6	*
	7	* Some parts based on ata_piix.c by Jeff Garzik and others.
	8	*
	9	* The EFAR is a PIIX4 clone with UDMA66 support. Unlike the later
	10	* Intel ICH controllers the EFAR widened the UDMA mode register bits
	11	* and doesn't require the funky clock selection.
	12	*/
	13
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16	#include <linux/pci.h>
	17	#include <linux/init.h>
	18	#include <linux/blkdev.h>
	19	#include <linux/delay.h>
	20	#include <linux/device.h>
	21	#include <scsi/scsi_host.h>
	22	#include <linux/libata.h>
	23	#include <linux/ata.h>
	24
	25	#define DRV_NAME "pata_efar"
5f33b3bc	26	#define DRV_VERSION "0.4.5"
669a5db4 JG	27
669a5db4 JG	28	/**
6bfed3fb	29	* efar_pre_reset - Enable bits
cc0680a5	30	* @link: ATA link
d4b2bab4	31	* @deadline: deadline jiffies for the operation
669a5db4 JG	32	*
	33	* Perform cable detection for the EFAR ATA interface. This is
	34	* different to the PIIX arrangement
	35	*/
	36
cc0680a5	37	static int efar_pre_reset(struct ata_link *link, unsigned long deadline)
669a5db4 JG	38	{
	39	static const struct pci_bits efar_enable_bits[] = {
	40	{ 0x41U, 1U, 0x80UL, 0x80UL }, /* port 0 */
	41	{ 0x43U, 1U, 0x80UL, 0x80UL }, /* port 1 */
	42	};
cc0680a5	43	struct ata_port *ap = link->ap;
669a5db4	44	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
669a5db4	45
c961922b AC	46	if (!pci_test_config_bits(pdev, &efar_enable_bits[ap->port_no]))
	47	return -ENOENT;
	48
9363c382	49	return ata_sff_prereset(link, deadline);
669a5db4 JG	50	}
669a5db4 JG	51
6bfed3fb AC	52	/**
	53	* efar_cable_detect - check for 40/80 pin
	54	* @ap: Port
	55	*
	56	* Perform cable detection for the EFAR ATA interface. This is
	57	* different to the PIIX arrangement
	58	*/
	59
	60	static int efar_cable_detect(struct ata_port *ap)
	61	{
	62	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	63	u8 tmp;
	64
	65	pci_read_config_byte(pdev, 0x47, &tmp);
	66	if (tmp & (2 >> ap->port_no))
	67	return ATA_CBL_PATA40;
	68	return ATA_CBL_PATA80;
	69	}
	70
669a5db4 JG	71	/**
	72	* efar_set_piomode - Initialize host controller PATA PIO timings
	73	* @ap: Port whose timings we are configuring
	74	* @adev: um
	75	*
	76	* Set PIO mode for device, in host controller PCI config space.
	77	*
	78	* LOCKING:
	79	* None (inherited from caller).
	80	*/
	81
	82	static void efar_set_piomode (struct ata_port ap, struct ata_device adev)
	83	{
	84	unsigned int pio = adev->pio_mode - XFER_PIO_0;
	85	struct pci_dev *dev = to_pci_dev(ap->host->dev);
	86	unsigned int idetm_port= ap->port_no ? 0x42 : 0x40;
	87	u16 idetm_data;
	88	int control = 0;
	89
	90	/*
	91	* See Intel Document 298600-004 for the timing programing rules
	92	* for PIIX/ICH. The EFAR is a clone so very similar
	93	*/
	94
	95	static const /* ISP RTC */
	96	u8 timings[][2] = { { 0, 0 },
	97	{ 0, 0 },
	98	{ 1, 0 },
	99	{ 2, 1 },
	100	{ 2, 3 }, };
	101
5f33b3bc SS	102	if (pio > 1)
5f33b3bc SS	103	control \|= 1; /* TIME */
669a5db4	104	if (ata_pio_need_iordy(adev)) /* PIO 3/4 require IORDY */
5f33b3bc SS	105	control \|= 2; /* IE */
5f33b3bc SS	106	/* Intel specifies that the prefetch/posting is for disk only */
669a5db4	107	if (adev->class == ATA_DEV_ATA)
5f33b3bc	108	control \|= 4; /* PPE */
669a5db4 JG	109
	110	pci_read_config_word(dev, idetm_port, &idetm_data);
	111
5f33b3bc	112	/* Set PPE, IE, and TIME as appropriate */
669a5db4 JG	113	if (adev->devno == 0) {
	114	idetm_data &= 0xCCF0;
	115	idetm_data \|= control;
	116	idetm_data \|= (timings[pio][0] << 12) \|
	117	(timings[pio][1] << 8);
	118	} else {
	119	int shift = 4 * ap->port_no;
	120	u8 slave_data;
	121
f79ff926	122	idetm_data &= 0xFF0F;
669a5db4 JG	123	idetm_data \|= (control << 4);
669a5db4 JG	124
1967b7ff	125	/* Slave timing in separate register */
669a5db4	126	pci_read_config_byte(dev, 0x44, &slave_data);
f79ff926	127	slave_data &= ap->port_no ? 0x0F : 0xF0;
669a5db4 JG	128	slave_data \|= ((timings[pio][0] << 2) \| timings[pio][1]) << shift;
	129	pci_write_config_byte(dev, 0x44, slave_data);
	130	}
	131
5f33b3bc	132	idetm_data \|= 0x4000; /* Ensure SITRE is set */
669a5db4 JG	133	pci_write_config_word(dev, idetm_port, idetm_data);
	134	}
	135
	136	/**
	137	* efar_set_dmamode - Initialize host controller PATA DMA timings
	138	* @ap: Port whose timings we are configuring
	139	* @adev: Device to program
	140	*
	141	* Set UDMA/MWDMA mode for device, in host controller PCI config space.
	142	*
	143	* LOCKING:
	144	* None (inherited from caller).
	145	*/
	146
	147	static void efar_set_dmamode (struct ata_port ap, struct ata_device adev)
	148	{
	149	struct pci_dev *dev = to_pci_dev(ap->host->dev);
	150	u8 master_port = ap->port_no ? 0x42 : 0x40;
	151	u16 master_data;
	152	u8 speed = adev->dma_mode;
	153	int devid = adev->devno + 2 * ap->port_no;
	154	u8 udma_enable;
	155
	156	static const /* ISP RTC */
	157	u8 timings[][2] = { { 0, 0 },
	158	{ 0, 0 },
	159	{ 1, 0 },
	160	{ 2, 1 },
	161	{ 2, 3 }, };
	162
	163	pci_read_config_word(dev, master_port, &master_data);
	164	pci_read_config_byte(dev, 0x48, &udma_enable);
	165
	166	if (speed >= XFER_UDMA_0) {
	167	unsigned int udma = adev->dma_mode - XFER_UDMA_0;
	168	u16 udma_timing;
	169
	170	udma_enable \|= (1 << devid);
	171
	172	/* Load the UDMA mode number */
	173	pci_read_config_word(dev, 0x4A, &udma_timing);
	174	udma_timing &= ~(7 << (4 * devid));
	175	udma_timing \|= udma << (4 * devid);
	176	pci_write_config_word(dev, 0x4A, udma_timing);
	177	} else {
	178	/*
	179	* MWDMA is driven by the PIO timings. We must also enable
	180	* IORDY unconditionally along with TIME1. PPE has already
	181	* been set when the PIO timing was set.
	182	*/
	183	unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0;
	184	unsigned int control;
	185	u8 slave_data;
	186	const unsigned int needed_pio[3] = {
	187	XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
	188	};
	189	int pio = needed_pio[mwdma] - XFER_PIO_0;
	190
	191	control = 3; /* IORDY\|TIME1 */
	192
	193	/* If the drive MWDMA is faster than it can do PIO then
	194	we must force PIO into PIO0 */
	195
	196	if (adev->pio_mode < needed_pio[mwdma])
197	/* Enable DMA timing only */
198	control \|= 8; /* PIO cycles in PIO0 */
199
200	if (adev->devno) { /* Slave */
201	master_data &= 0xFF4F; /* Mask out IORDY\|TIME1\|DMAONLY */
202	master_data \|= control << 4;
203	pci_read_config_byte(dev, 0x44, &slave_data);
dd221f9c	204	slave_data &= ap->port_no ? 0x0F : 0xF0;
669a5db4 JG	205	/* Load the matching timing */
	206	slave_data \|= ((timings[pio][0] << 2) \| timings[pio][1]) << (ap->port_no ? 4 : 0);
	207	pci_write_config_byte(dev, 0x44, slave_data);
	208	} else { /* Master */
	209	master_data &= 0xCCF4; /* Mask out IORDY\|TIME1\|DMAONLY
	210	and master timing bits */
	211	master_data \|= control;
	212	master_data \|=
	213	(timings[pio][0] << 12) \|
	214	(timings[pio][1] << 8);
	215	}
	216	udma_enable &= ~(1 << devid);
	217	pci_write_config_word(dev, master_port, master_data);
	218	}
	219	pci_write_config_byte(dev, 0x48, udma_enable);
	220	}
	221
	222	static struct scsi_host_template efar_sht = {
68d1d07b	223	ATA_BMDMA_SHT(DRV_NAME),
669a5db4 JG	224	};
669a5db4 JG	225
029cfd6b TH	226	static struct ata_port_operations efar_ops = {
	227	.inherits = &ata_bmdma_port_ops,
	228	.cable_detect = efar_cable_detect,
669a5db4 JG	229	.set_piomode = efar_set_piomode,
669a5db4 JG	230	.set_dmamode = efar_set_dmamode,
a1efdaba	231	.prereset = efar_pre_reset,
669a5db4 JG	232	};
	233
	234
	235	/**
	236	* efar_init_one - Register EFAR ATA PCI device with kernel services
	237	* @pdev: PCI device to register
	238	* @ent: Entry in efar_pci_tbl matching with @pdev
	239	*
	240	* Called from kernel PCI layer.
	241	*
	242	* LOCKING:
	243	* Inherited from PCI layer (may sleep).
	244	*
	245	* RETURNS:
	246	* Zero on success, or -ERRNO value.
	247	*/
	248
	249	static int efar_init_one (struct pci_dev pdev, const struct pci_device_id ent)
	250	{
	251	static int printed_version;
1626aeb8	252	static const struct ata_port_info info = {
1d2808fd	253	.flags = ATA_FLAG_SLAVE_POSS,
14bdef98	254	.pio_mask = ATA_PIO4,
82563232	255	.mwdma_mask = ATA_MWDMA12_ONLY,
b2a034cf	256	.udma_mask = ATA_UDMA4,
669a5db4 JG	257	.port_ops = &efar_ops,
669a5db4 JG	258	};
73e2e3d0	259	const struct ata_port_info *ppi[] = { &info, &info };
669a5db4 JG	260
	261	if (!printed_version++)
	262	dev_printk(KERN_DEBUG, &pdev->dev,
	263	"version " DRV_VERSION "\n");
	264
9363c382	265	return ata_pci_sff_init_one(pdev, ppi, &efar_sht, NULL);
669a5db4 JG	266	}
	267
	268	static const struct pci_device_id efar_pci_tbl[] = {
2d2744fc JG	269	{ PCI_VDEVICE(EFAR, 0x9130), },
2d2744fc JG	270
669a5db4 JG	271	{ } /* terminate list */
	272	};
	273
	274	static struct pci_driver efar_pci_driver = {
	275	.name = DRV_NAME,
	276	.id_table = efar_pci_tbl,
	277	.probe = efar_init_one,
	278	.remove = ata_pci_remove_one,
438ac6d5	279	#ifdef CONFIG_PM
30ced0f0 AC	280	.suspend = ata_pci_device_suspend,
30ced0f0 AC	281	.resume = ata_pci_device_resume,
438ac6d5	282	#endif
669a5db4 JG	283	};
	284
	285	static int __init efar_init(void)
	286	{
	287	return pci_register_driver(&efar_pci_driver);
	288	}
	289
	290	static void __exit efar_exit(void)
	291	{
	292	pci_unregister_driver(&efar_pci_driver);
	293	}
	294
669a5db4 JG	295	module_init(efar_init);
	296	module_exit(efar_exit);
	297
	298	MODULE_AUTHOR("Alan Cox");
	299	MODULE_DESCRIPTION("SCSI low-level driver for EFAR PIIX clones");
	300	MODULE_LICENSE("GPL");
	301	MODULE_DEVICE_TABLE(pci, efar_pci_tbl);
	302	MODULE_VERSION(DRV_VERSION);
	303