Subversion Repositories test_project

/*

 *    pata_oldpiix.c - Intel PATA/SATA controllers

 *

 *      (C) 2005 Red Hat <alan@redhat.com>

 *

 *    Some parts based on ata_piix.c by Jeff Garzik and others.

 *

 *    Early PIIX differs significantly from the later PIIX as it lacks

 *    SITRE and the slave timing registers. This means that you have to

 *    set timing per channel, or be clever. Libata tells us whenever it

 *    does drive selection and we use this to reload the timings.

 *

 *    Because of these behaviour differences PIIX gets its own driver module.

 */

#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_oldpiix"

#define DRV_VERSION     "0.5.5"

/**

 *      oldpiix_pre_reset               -       probe begin

 *      @link: ATA link

 *      @deadline: deadline jiffies for the operation

 *

 *      Set up cable type and use generic probe init

 */

static int oldpiix_pre_reset(struct ata_link *link, unsigned long deadline)

{

        struct ata_port *ap = link->ap;

        struct pci_dev *pdev = to_pci_dev(ap->host->dev);

        static const struct pci_bits oldpiix_enable_bits[] = {

                { 0x41U, 1U, 0x80UL, 0x80UL },  /* port 0 */

                { 0x43U, 1U, 0x80UL, 0x80UL },  /* port 1 */

        };

        if (!pci_test_config_bits(pdev, &oldpiix_enable_bits[ap->port_no]))

                return -ENOENT;

        return ata_std_prereset(link, deadline);

}

/**

 *      oldpiix_pata_error_handler - Probe specified port on PATA host controller

 *      @ap: Port to probe

 *      @classes:

 *

 *      LOCKING:

 *      None (inherited from caller).

 */

static void oldpiix_pata_error_handler(struct ata_port *ap)

{

        ata_bmdma_drive_eh(ap, oldpiix_pre_reset, ata_std_softreset, NULL, ata_std_postreset);

}

/**

 *      oldpiix_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 oldpiix_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. Note that the early PIIX does not have the slave

         *      timing port at 0x44.

         */

        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))

                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.

         * Clear the other drive's timing bits.

         */

        if (adev->devno == 0) {

                idetm_data &= 0xCCE0;

                idetm_data |= control;

        } else {

                idetm_data &= 0xCC0E;

                idetm_data |= (control << 4);

        }

        idetm_data |= (timings[pio][0] << 12) |

                        (timings[pio][1] << 8);

        pci_write_config_word(dev, idetm_port, idetm_data);

        /* Track which port is configured */

        ap->private_data = adev;

}

/**

 *      oldpiix_set_dmamode - Initialize host controller PATA DMA timings

 *      @ap: Port whose timings we are configuring

 *      @adev: Device to program

 *      @isich: True if the device is an ICH and has IOCFG registers

 *

 *      Set MWDMA mode for device, in host controller PCI config space.

 *

 *      LOCKING:

 *      None (inherited from caller).

 */

static void oldpiix_set_dmamode (struct ata_port *ap, struct ata_device *adev)

{

        struct pci_dev *dev     = to_pci_dev(ap->host->dev);

        u8 idetm_port           = ap->port_no ? 0x42 : 0x40;

        u16 idetm_data;

        static const     /* ISP  RTC */

        u8 timings[][2] = { { 0, 0 },

                            { 0, 0 },

                            { 1, 0 },

                            { 2, 1 },

                            { 2, 3 }, };

        /*

         * 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;

        const unsigned int needed_pio[3] = {

                XFER_PIO_0, XFER_PIO_3, XFER_PIO_4

        };

        int pio = needed_pio[mwdma] - XFER_PIO_0;

        pci_read_config_word(dev, idetm_port, &idetm_data);

        control = 3;    /* IORDY|TIME0 */

        /* Intel specifies that the PPE functionality is for disk only */

        if (adev->class == ATA_DEV_ATA)

                control |= 4;   /* PPE enable */

        /* 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 */

        /* Mask out the relevant control and timing bits we will load. Also

           clear the other drive TIME register as a precaution */

        if (adev->devno == 0) {

                idetm_data &= 0xCCE0;

                idetm_data |= control;

        } else {

                idetm_data &= 0xCC0E;

                idetm_data |= (control << 4);

        }

        idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);

        pci_write_config_word(dev, idetm_port, idetm_data);

        /* Track which port is configured */

        ap->private_data = adev;

}

/**

 *      oldpiix_qc_issue_prot   -       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. Our logic also clears TIME0/TIME1 for the other device so

 *      that, even if we get this wrong, cycles to the other device will

 *      be made PIO0.

 */

static unsigned int oldpiix_qc_issue_prot(struct ata_queued_cmd *qc)

{

        struct ata_port *ap = qc->ap;

        struct ata_device *adev = qc->dev;

        if (adev != ap->private_data) {

                oldpiix_set_piomode(ap, adev);

                if (adev->dma_mode)

                        oldpiix_set_dmamode(ap, adev);

        }

        return ata_qc_issue_prot(qc);

}

static struct scsi_host_template oldpiix_sht = {

        .module                 = THIS_MODULE,

        .name                   = DRV_NAME,

        .ioctl                  = ata_scsi_ioctl,

        .queuecommand           = ata_scsi_queuecmd,

        .can_queue              = ATA_DEF_QUEUE,

        .this_id                = ATA_SHT_THIS_ID,

        .sg_tablesize           = LIBATA_MAX_PRD,

        .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,

        .emulated               = ATA_SHT_EMULATED,

        .use_clustering         = ATA_SHT_USE_CLUSTERING,

        .proc_name              = DRV_NAME,

        .dma_boundary           = ATA_DMA_BOUNDARY,

        .slave_configure        = ata_scsi_slave_config,

        .slave_destroy          = ata_scsi_slave_destroy,

        .bios_param             = ata_std_bios_param,

};

static const struct ata_port_operations oldpiix_pata_ops = {

        .set_piomode            = oldpiix_set_piomode,

        .set_dmamode            = oldpiix_set_dmamode,

        .mode_filter            = ata_pci_default_filter,

        .tf_load                = ata_tf_load,

        .tf_read                = ata_tf_read,

        .check_status           = ata_check_status,

        .exec_command           = ata_exec_command,

        .dev_select             = ata_std_dev_select,

        .freeze                 = ata_bmdma_freeze,

        .thaw                   = ata_bmdma_thaw,

        .error_handler          = oldpiix_pata_error_handler,

        .post_internal_cmd      = ata_bmdma_post_internal_cmd,

        .cable_detect           = ata_cable_40wire,

        .bmdma_setup            = ata_bmdma_setup,

        .bmdma_start            = ata_bmdma_start,

        .bmdma_stop             = ata_bmdma_stop,

        .bmdma_status           = ata_bmdma_status,

        .qc_prep                = ata_qc_prep,

        .qc_issue               = oldpiix_qc_issue_prot,

        .data_xfer              = ata_data_xfer,

        .irq_handler            = ata_interrupt,

        .irq_clear              = ata_bmdma_irq_clear,

        .irq_on                 = ata_irq_on,

        .port_start             = ata_sff_port_start,

};

/**

 *      oldpiix_init_one - Register PIIX ATA PCI device with kernel services

 *      @pdev: PCI device to register

 *      @ent: Entry in oldpiix_pci_tbl matching with @pdev

 *

 *      Called from kernel PCI layer.  We probe for combined mode (sigh),

 *      and then hand over control to libata, for it to do the rest.

 *

 *      LOCKING:

 *      Inherited from PCI layer (may sleep).

 *

 *      RETURNS:

 *      Zero on success, or -ERRNO value.

 */

static int oldpiix_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)

{

        static int printed_version;

        static const struct ata_port_info info = {

                .sht            = &oldpiix_sht,

                .flags          = ATA_FLAG_SLAVE_POSS,

                .pio_mask       = 0x1f, /* pio0-4 */

                .mwdma_mask     = 0x07, /* mwdma1-2 */

                .port_ops       = &oldpiix_pata_ops,

        };

        const struct ata_port_info *ppi[] = { &info, NULL };

        if (!printed_version++)

                dev_printk(KERN_DEBUG, &pdev->dev,

                           "version " DRV_VERSION "\n");

        return ata_pci_init_one(pdev, ppi);

}

static const struct pci_device_id oldpiix_pci_tbl[] = {

        { PCI_VDEVICE(INTEL, 0x1230), },

        { }     /* terminate list */

};

static struct pci_driver oldpiix_pci_driver = {

        .name                   = DRV_NAME,

        .id_table               = oldpiix_pci_tbl,

        .probe                  = oldpiix_init_one,

        .remove                 = ata_pci_remove_one,

#ifdef CONFIG_PM

        .suspend                = ata_pci_device_suspend,

        .resume                 = ata_pci_device_resume,

#endif

};

static int __init oldpiix_init(void)

{

        return pci_register_driver(&oldpiix_pci_driver);

}

static void __exit oldpiix_exit(void)

{

        pci_unregister_driver(&oldpiix_pci_driver);

}

module_init(oldpiix_init);

module_exit(oldpiix_exit);

MODULE_AUTHOR("Alan Cox");

MODULE_DESCRIPTION("SCSI low-level driver for early PIIX series controllers");

MODULE_LICENSE("GPL");

MODULE_DEVICE_TABLE(pci, oldpiix_pci_tbl);

MODULE_VERSION(DRV_VERSION);