drivers/ata/pata_it8213.c - kernel/msm-4.9 - Gitiles

 /*
  *    pata_it8213.c - iTE Tech. Inc.  IT8213 PATA driver
  *
  *    The IT8213 is a very Intel ICH like device for timing purposes, having
  *    a similar register layout and the same split clock arrangement. Cable
  *    detection is different, and it does not have slave channels or all the
  *    clutter of later ICH/SATA setups.
  */

 #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_it8213"
 #define DRV_VERSION	"0.0.3"

 /**
  *	it8213_pre_reset	-	probe begin
  *	@link: link
  *	@deadline: deadline jiffies for the operation
  *
  *	Filter out ports by the enable bits before doing the normal reset
  *	and probe.
  */

 static int it8213_pre_reset(struct ata_link *link, unsigned long deadline)
 {
 	static const struct pci_bits it8213_enable_bits[] = {
 		{ 0x41U, 1U, 0x80UL, 0x80UL },	/* port 0 */
 	};
 	struct ata_port *ap = link->ap;
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	if (!pci_test_config_bits(pdev, &it8213_enable_bits[ap->port_no]))
 		return -ENOENT;

 	return ata_sff_prereset(link, deadline);
 }

 /**
  *	it8213_cable_detect	-	check for 40/80 pin
  *	@ap: Port
  *
  *	Perform cable detection for the 8213 ATA interface. This is
  *	different to the PIIX arrangement
  */

 static int it8213_cable_detect(struct ata_port *ap)
 {
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	u8 tmp;
 	pci_read_config_byte(pdev, 0x42, &tmp);
 	if (tmp & 2)	/* The initial docs are incorrect */
 		return ATA_CBL_PATA40;
 	return ATA_CBL_PATA80;
 }

 /**
  *	it8213_set_piomode - Initialize host controller PATA PIO timings
  *	@ap: Port whose timings we are configuring
  *	@adev: Device whose timings we are configuring
  *
  *	Set PIO mode for device, in host controller PCI config space.
  *
  *	LOCKING:
  *	None (inherited from caller).
  */

 static void it8213_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 8213 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 */
 	/* Bit 2 is set for ATAPI on the IT8213 - reverse of ICH/PIIX */
 	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 {
 		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 &= 0xF0;
 		slave_data |= (timings[pio][0] << 2) | timings[pio][1];
 		pci_write_config_byte(dev, 0x44, slave_data);
 	}

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

 /**
  *	it8213_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.
  *	This device is basically an ICH alike.
  *
  *	LOCKING:
  *	None (inherited from caller).
  */

 static void it8213_set_dmamode (struct ata_port *ap, struct ata_device *adev)
 {
 	struct pci_dev *dev	= to_pci_dev(ap->host->dev);
 	u16 master_data;
 	u8 speed		= adev->dma_mode;
 	int devid		= adev->devno;
 	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, 0x40, &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;
 		u16 ideconf;
 		int u_clock, u_speed;

 		/* Clocks follow the PIIX style */
 		u_speed = min(2 - (udma & 1), udma);
 		if (udma == 5)
 			u_clock = 0x1000;	/* 100Mhz */
 		else if (udma > 2)
 			u_clock = 1;		/* 66Mhz */
 		else
 			u_clock = 0;		/* 33Mhz */

 		udma_enable |= (1 << devid);

 		/* Load the UDMA cycle time */
 		pci_read_config_word(dev, 0x4A, &udma_timing);
 		udma_timing &= ~(3 << (4 * devid));
 		udma_timing |= u_speed << (4 * devid);
 		pci_write_config_word(dev, 0x4A, udma_timing);

 		/* Load the clock selection */
 		pci_read_config_word(dev, 0x54, &ideconf);
 		ideconf &= ~(0x1001 << devid);
 		ideconf |= u_clock << devid;
 		pci_write_config_word(dev, 0x54, ideconf);
 	} 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;
 		static 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 (devid) {	/* Slave */
 			master_data &= 0xFF4F;  /* Mask out IORDY|TIME1|DMAONLY */
 			master_data |= control << 4;
 			pci_read_config_byte(dev, 0x44, &slave_data);
 			slave_data &= 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, 0x40, master_data);
 	}
 	pci_write_config_byte(dev, 0x48, udma_enable);
 }

 static struct scsi_host_template it8213_sht = {
 	ATA_BMDMA_SHT(DRV_NAME),
 };


 static struct ata_port_operations it8213_ops = {
 	.inherits		= &ata_bmdma_port_ops,
 	.cable_detect		= it8213_cable_detect,
 	.set_piomode		= it8213_set_piomode,
 	.set_dmamode		= it8213_set_dmamode,
 	.prereset		= it8213_pre_reset,
 };


 /**
  *	it8213_init_one - Register 8213 ATA PCI device with kernel services
  *	@pdev: PCI device to register
  *	@ent: Entry in it8213_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 it8213_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_MWDMA2,
 		.udma_mask 	= ATA_UDMA4, /* FIXME: want UDMA 100? */
 		.port_ops	= &it8213_ops,
 	};
 	/* Current IT8213 stuff is single port */
 	const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };

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

 	return ata_pci_sff_init_one(pdev, ppi, &it8213_sht, NULL);
 }

 static const struct pci_device_id it8213_pci_tbl[] = {
 	{ PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8213), },

 	{ }	/* terminate list */
 };

 static struct pci_driver it8213_pci_driver = {
 	.name			= DRV_NAME,
 	.id_table		= it8213_pci_tbl,
 	.probe			= it8213_init_one,
 	.remove			= ata_pci_remove_one,
 #ifdef CONFIG_PM
 	.suspend		= ata_pci_device_suspend,
 	.resume			= ata_pci_device_resume,
 #endif
 };

 static int __init it8213_init(void)
 {
 	return pci_register_driver(&it8213_pci_driver);
 }

 static void __exit it8213_exit(void)
 {
 	pci_unregister_driver(&it8213_pci_driver);
 }

 module_init(it8213_init);
 module_exit(it8213_exit);

 MODULE_AUTHOR("Alan Cox");
 MODULE_DESCRIPTION("SCSI low-level driver for the ITE 8213");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(pci, it8213_pci_tbl);
 MODULE_VERSION(DRV_VERSION);
	/*
	* pata_it8213.c - iTE Tech. Inc. IT8213 PATA driver
	*
	* The IT8213 is a very Intel ICH like device for timing purposes, having
	* a similar register layout and the same split clock arrangement. Cable
	* detection is different, and it does not have slave channels or all the
	* clutter of later ICH/SATA setups.
	*/

	#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_it8213"
	#define DRV_VERSION "0.0.3"

	/**
	* it8213_pre_reset - probe begin
	* @link: link
	* @deadline: deadline jiffies for the operation
	*
	* Filter out ports by the enable bits before doing the normal reset
	* and probe.
	*/

	static int it8213_pre_reset(struct ata_link *link, unsigned long deadline)
	{
	static const struct pci_bits it8213_enable_bits[] = {
	{ 0x41U, 1U, 0x80UL, 0x80UL }, /* port 0 */
	};
	struct ata_port *ap = link->ap;
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	if (!pci_test_config_bits(pdev, &it8213_enable_bits[ap->port_no]))
	return -ENOENT;

	return ata_sff_prereset(link, deadline);
	}

	/**
	* it8213_cable_detect - check for 40/80 pin
	* @ap: Port
	*
	* Perform cable detection for the 8213 ATA interface. This is
	* different to the PIIX arrangement
	*/

	static int it8213_cable_detect(struct ata_port *ap)
	{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	u8 tmp;
	pci_read_config_byte(pdev, 0x42, &tmp);
	if (tmp & 2) /* The initial docs are incorrect */
	return ATA_CBL_PATA40;
	return ATA_CBL_PATA80;
	}

	/**
	* it8213_set_piomode - Initialize host controller PATA PIO timings
	* @ap: Port whose timings we are configuring
	* @adev: Device whose timings we are configuring
	*
	* Set PIO mode for device, in host controller PCI config space.
	*
	* LOCKING:
	* None (inherited from caller).
	*/

	static void it8213_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 8213 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 */
	/* Bit 2 is set for ATAPI on the IT8213 - reverse of ICH/PIIX */
	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 {
	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 &= 0xF0;
	slave_data \|= (timings[pio][0] << 2) \| timings[pio][1];
	pci_write_config_byte(dev, 0x44, slave_data);
	}

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

	/**
	* it8213_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.
	* This device is basically an ICH alike.
	*
	* LOCKING:
	* None (inherited from caller).
	*/

	static void it8213_set_dmamode (struct ata_port ap, struct ata_device adev)
	{
	struct pci_dev *dev = to_pci_dev(ap->host->dev);
	u16 master_data;
	u8 speed = adev->dma_mode;
	int devid = adev->devno;
	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, 0x40, &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;
	u16 ideconf;
	int u_clock, u_speed;

	/* Clocks follow the PIIX style */
	u_speed = min(2 - (udma & 1), udma);
	if (udma == 5)
	u_clock = 0x1000; /* 100Mhz */
	else if (udma > 2)
	u_clock = 1; /* 66Mhz */
	else
	u_clock = 0; /* 33Mhz */

	udma_enable \|= (1 << devid);

	/* Load the UDMA cycle time */
	pci_read_config_word(dev, 0x4A, &udma_timing);
	udma_timing &= ~(3 << (4 * devid));
	udma_timing \|= u_speed << (4 * devid);
	pci_write_config_word(dev, 0x4A, udma_timing);

	/* Load the clock selection */
	pci_read_config_word(dev, 0x54, &ideconf);
	ideconf &= ~(0x1001 << devid);
	ideconf \|= u_clock << devid;
	pci_write_config_word(dev, 0x54, ideconf);
	} 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;
	static 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 (devid) { /* Slave */
	master_data &= 0xFF4F; /* Mask out IORDY\|TIME1\|DMAONLY */
	master_data \|= control << 4;
	pci_read_config_byte(dev, 0x44, &slave_data);
	slave_data &= 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, 0x40, master_data);
	}
	pci_write_config_byte(dev, 0x48, udma_enable);
	}

	static struct scsi_host_template it8213_sht = {
	ATA_BMDMA_SHT(DRV_NAME),
	};


	static struct ata_port_operations it8213_ops = {
	.inherits = &ata_bmdma_port_ops,
	.cable_detect = it8213_cable_detect,
	.set_piomode = it8213_set_piomode,
	.set_dmamode = it8213_set_dmamode,
	.prereset = it8213_pre_reset,
	};


	/**
	* it8213_init_one - Register 8213 ATA PCI device with kernel services
	* @pdev: PCI device to register
	* @ent: Entry in it8213_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 it8213_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_MWDMA2,
	.udma_mask = ATA_UDMA4, /* FIXME: want UDMA 100? */
	.port_ops = &it8213_ops,
	};
	/* Current IT8213 stuff is single port */
	const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };

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

	return ata_pci_sff_init_one(pdev, ppi, &it8213_sht, NULL);
	}

	static const struct pci_device_id it8213_pci_tbl[] = {
	{ PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8213), },

	{ } /* terminate list */
	};

	static struct pci_driver it8213_pci_driver = {
	.name = DRV_NAME,
	.id_table = it8213_pci_tbl,
	.probe = it8213_init_one,
	.remove = ata_pci_remove_one,
	#ifdef CONFIG_PM
	.suspend = ata_pci_device_suspend,
	.resume = ata_pci_device_resume,
	#endif
	};

	static int __init it8213_init(void)
	{
	return pci_register_driver(&it8213_pci_driver);
	}

	static void __exit it8213_exit(void)
	{
	pci_unregister_driver(&it8213_pci_driver);
	}

	module_init(it8213_init);
	module_exit(it8213_exit);

	MODULE_AUTHOR("Alan Cox");
	MODULE_DESCRIPTION("SCSI low-level driver for the ITE 8213");
	MODULE_LICENSE("GPL");
	MODULE_DEVICE_TABLE(pci, it8213_pci_tbl);
	MODULE_VERSION(DRV_VERSION);