cregit-Linux how code gets into the kernel

Release 4.7 drivers/ata/pata_efar.c

Directory: drivers/ata
/*
 *    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/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);
}


Contributors
PersonTokensPropCommitsCommitProp
jeff garzikjeff garzik7778.57%120.00%


tejun heotejun heo1919.39%360.00%


alan coxalan cox22.04%120.00%


Total98100.00%5100.00%



/**
 *      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;
}


Contributors
PersonTokensPropCommitsCommitProp
alan coxalan cox56100.00%1100.00%


Total56100.00%1100.00%



static DEFINE_SPINLOCK(efar_lock);

/**
 *      efar_set_piomode - Initialize host controller PATA PIO timings
 *      @ap: Port whose timings we are configuring
 *      @adev: Device to program
 *
 *      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 master_port = ap->port_no ? 0x42 : 0x40;
	unsigned long flags;
	u16 master_data;
	u8 udma_enable;
	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 */

	spin_lock_irqsave(&efar_lock, flags);

	pci_read_config_word(dev, master_port, &master_data);

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

		master_data &= 0xFF0F;
		master_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);
	}

	master_data |= 0x4000;	/* Ensure SITRE is set */
	pci_write_config_word(dev, master_port, master_data);

	pci_read_config_byte(dev, 0x48, &udma_enable);
	udma_enable &= ~(1 << (2 * ap->port_no + adev->devno));
	pci_write_config_byte(dev, 0x48, udma_enable);
	spin_unlock_irqrestore(&efar_lock, flags);
}


Contributors
PersonTokensPropCommitsCommitProp
jeff garzikjeff garzik26675.14%116.67%


bartlomiej zolnierkiewiczbartlomiej zolnierkiewicz8022.60%350.00%


sergei shtylyovsergei shtylyov71.98%116.67%


joe perchesjoe perches10.28%116.67%


Total354100.00%6100.00%



/**
 *      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;
	unsigned long flags;
	u8 udma_enable;

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

	spin_lock_irqsave(&efar_lock, flags);

	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);
	spin_unlock_irqrestore(&efar_lock, flags);
}


Contributors
PersonTokensPropCommitsCommitProp
jeff garzikjeff garzik41794.56%133.33%


bartlomiej zolnierkiewiczbartlomiej zolnierkiewicz245.44%266.67%


Total441100.00%3100.00%




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 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 };

	ata_print_version_once(&pdev->dev, DRV_VERSION);

	return ata_pci_bmdma_init_one(pdev, ppi, &efar_sht, NULL,
				      ATA_HOST_PARALLEL_SCAN);
}


Contributors
PersonTokensPropCommitsCommitProp
jeff garzikjeff garzik7279.12%18.33%


tejun heotejun heo1112.09%433.33%


bartlomiej zolnierkiewiczbartlomiej zolnierkiewicz33.30%216.67%


erik inge bolsoerik inge bolso22.20%216.67%


alan coxalan cox22.20%216.67%


joe perchesjoe perches11.10%18.33%


Total91100.00%12100.00%




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_SLEEP
	.suspend		= ata_pci_device_suspend,
	.resume			= ata_pci_device_resume,
#endif
};


module_pci_driver(efar_pci_driver);

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);

Overall Contributors
PersonTokensPropCommitsCommitProp
jeff garzikjeff garzik96978.91%26.06%


bartlomiej zolnierkiewiczbartlomiej zolnierkiewicz1169.45%721.21%


alan coxalan cox766.19%515.15%


tejun heotejun heo504.07%1236.36%


sergei shtylyovsergei shtylyov80.65%13.03%


akira iguchiakira iguchi30.24%13.03%


axel linaxel lin20.16%13.03%


joe perchesjoe perches20.16%26.06%


erik inge bolsoerik inge bolso20.16%26.06%


Total1228100.00%33100.00%

  
Directory: drivers/ata



Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
{% endraw %}