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/*

 * pata_cypress.c       - Cypress PATA for new ATA layer

 *                        (C) 2006 Red Hat Inc

 *                        Alan Cox <alan@redhat.com>

 *

 * Based heavily on

 * linux/drivers/ide/pci/cy82c693.c             Version 0.40    Sep. 10, 2002

 *

 */

#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 <scsi/scsi_host.h>

#include <linux/libata.h>

#define DRV_NAME "pata_cypress"

#define DRV_VERSION "0.1.5"

/* here are the offset definitions for the registers */

enum {

        CY82_IDE_CMDREG         = 0x04,

        CY82_IDE_ADDRSETUP      = 0x48,

        CY82_IDE_MASTER_IOR     = 0x4C,

        CY82_IDE_MASTER_IOW     = 0x4D,

        CY82_IDE_SLAVE_IOR      = 0x4E,

        CY82_IDE_SLAVE_IOW      = 0x4F,

        CY82_IDE_MASTER_8BIT    = 0x50,

        CY82_IDE_SLAVE_8BIT     = 0x51,

        CY82_INDEX_PORT         = 0x22,

        CY82_DATA_PORT          = 0x23,

        CY82_INDEX_CTRLREG1     = 0x01,

        CY82_INDEX_CHANNEL0     = 0x30,

        CY82_INDEX_CHANNEL1     = 0x31,

        CY82_INDEX_TIMEOUT      = 0x32

};

/**

 *      cy82c693_set_piomode    -       set initial PIO mode data

 *      @ap: ATA interface

 *      @adev: ATA device

 *

 *      Called to do the PIO mode setup.

 */

static void cy82c693_set_piomode(struct ata_port *ap, struct ata_device *adev)

{

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

        struct ata_timing t;

        const unsigned long T = 1000000 / 33;

        short time_16, time_8;

        u32 addr;

        if (ata_timing_compute(adev, adev->pio_mode, &t, T, 1) < 0) {

                printk(KERN_ERR DRV_NAME ": mome computation failed.\n");

                return;

        }

        time_16 = FIT(t.recover, 0, 15) | (FIT(t.active, 0, 15) << 4);

        time_8 = FIT(t.act8b, 0, 15) | (FIT(t.rec8b, 0, 15) << 4);

        if (adev->devno == 0) {

                pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);

                addr &= ~0x0F;  /* Mask bits */

                addr |= FIT(t.setup, 0, 15);

                pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);

                pci_write_config_byte(pdev, CY82_IDE_MASTER_IOR, time_16);

                pci_write_config_byte(pdev, CY82_IDE_MASTER_IOW, time_16);

                pci_write_config_byte(pdev, CY82_IDE_MASTER_8BIT, time_8);

        } else {

                pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);

                addr &= ~0xF0;  /* Mask bits */

                addr |= (FIT(t.setup, 0, 15) << 4);

                pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);

                pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOR, time_16);

                pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOW, time_16);

                pci_write_config_byte(pdev, CY82_IDE_SLAVE_8BIT, time_8);

        }

}

/**

 *      cy82c693_set_dmamode    -       set initial DMA mode data

 *      @ap: ATA interface

 *      @adev: ATA device

 *

 *      Called to do the DMA mode setup.

 */

static void cy82c693_set_dmamode(struct ata_port *ap, struct ata_device *adev)

{

        int reg = CY82_INDEX_CHANNEL0 + ap->port_no;

        /* Be afraid, be very afraid. Magic registers  in low I/O space */

        outb(reg, 0x22);

        outb(adev->dma_mode - XFER_MW_DMA_0, 0x23);

        /* 0x50 gives the best behaviour on the Alpha's using this chip */

        outb(CY82_INDEX_TIMEOUT, 0x22);

        outb(0x50, 0x23);

}

static struct scsi_host_template cy82c693_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 struct ata_port_operations cy82c693_port_ops = {

        .set_piomode    = cy82c693_set_piomode,

        .set_dmamode    = cy82c693_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  = ata_bmdma_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       = ata_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,

};

static int cy82c693_init_one(struct pci_dev *pdev, const struct pci_device_id *id)

{

        static const struct ata_port_info info = {

                .sht = &cy82c693_sht,

                .flags = ATA_FLAG_SLAVE_POSS,

                .pio_mask = 0x1f,

                .mwdma_mask = 0x07,

                .port_ops = &cy82c693_port_ops

        };

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

        /* Devfn 1 is the ATA primary. The secondary is magic and on devfn2.

           For the moment we don't handle the secondary. FIXME */

        if (PCI_FUNC(pdev->devfn) != 1)

                return -ENODEV;

        return ata_pci_init_one(pdev, ppi);

}

static const struct pci_device_id cy82c693[] = {

        { PCI_VDEVICE(CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693), },

        { },

};

static struct pci_driver cy82c693_pci_driver = {

        .name           = DRV_NAME,

        .id_table       = cy82c693,

        .probe          = cy82c693_init_one,

        .remove         = ata_pci_remove_one,

#ifdef CONFIG_PM

        .suspend        = ata_pci_device_suspend,

        .resume         = ata_pci_device_resume,

#endif

};

static int __init cy82c693_init(void)

{

        return pci_register_driver(&cy82c693_pci_driver);

}

static void __exit cy82c693_exit(void)

{

        pci_unregister_driver(&cy82c693_pci_driver);

}

MODULE_AUTHOR("Alan Cox");

MODULE_DESCRIPTION("low-level driver for the CY82C693 PATA controller");

MODULE_LICENSE("GPL");

MODULE_DEVICE_TABLE(pci, cy82c693);

MODULE_VERSION(DRV_VERSION);

module_init(cy82c693_init);

module_exit(cy82c693_exit);