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/*

 * pata_cmd640.c        - CMD640 PCI PATA for new ATA layer

 *                        (C) 2007 Red Hat Inc

 *                        Alan Cox <alan@redhat.com>

 *

 * Based upon

 *  linux/drivers/ide/pci/cmd640.c              Version 1.02  Sep 01, 1996

 *

 *  Copyright (C) 1995-1996  Linus Torvalds & authors (see driver)

 *

 *      This drives only the PCI version of the controller. If you have a

 *      VLB one then we have enough docs to support it but you can write

 *      your own code.

 */

#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_cmd640"

#define DRV_VERSION "0.0.5"

struct cmd640_reg {

        int last;

        u8 reg58[ATA_MAX_DEVICES];

};

enum {

        CFR = 0x50,

        CNTRL = 0x51,

        CMDTIM = 0x52,

        ARTIM0 = 0x53,

        DRWTIM0 = 0x54,

        ARTIM23 = 0x57,

        DRWTIM23 = 0x58,

        BRST = 0x59

};

/**

 *      cmd640_set_piomode      -       set initial PIO mode data

 *      @ap: ATA port

 *      @adev: ATA device

 *

 *      Called to do the PIO mode setup.

 */

static void cmd640_set_piomode(struct ata_port *ap, struct ata_device *adev)

{

        struct cmd640_reg *timing = ap->private_data;

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

        struct ata_timing t;

        const unsigned long T = 1000000 / 33;

        const u8 setup_data[] = { 0x40, 0x40, 0x40, 0x80, 0x00 };

        u8 reg;

        int arttim = ARTIM0 + 2 * adev->devno;

        struct ata_device *pair = ata_dev_pair(adev);

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

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

                return;

        }

        /* The second channel has shared timings and the setup timing is

           messy to switch to merge it for worst case */

        if (ap->port_no && pair) {

                struct ata_timing p;

                ata_timing_compute(pair, pair->pio_mode, &p, T, 1);

                ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP);

        }

        /* Make the timings fit */

        if (t.recover > 16) {

                t.active += t.recover - 16;

                t.recover = 16;

        }

        if (t.active > 16)

                t.active = 16;

        /* Now convert the clocks into values we can actually stuff into

           the chip */

        if (t.recover > 1)

                t.recover--;    /* 640B only */

        else

                t.recover = 15;

        if (t.setup > 4)

                t.setup = 0xC0;

        else

                t.setup = setup_data[t.setup];

        if (ap->port_no == 0) {

                t.active &= 0x0F;       /* 0 = 16 */

                /* Load setup timing */

                pci_read_config_byte(pdev, arttim, &reg);

                reg &= 0x3F;

                reg |= t.setup;

                pci_write_config_byte(pdev, arttim, reg);

                /* Load active/recovery */

                pci_write_config_byte(pdev, arttim + 1, (t.active << 4) | t.recover);

        } else {

                /* Save the shared timings for channel, they will be loaded

                   by qc_issue_prot. Reloading the setup time is expensive

                   so we keep a merged one loaded */

                pci_read_config_byte(pdev, ARTIM23, &reg);

                reg &= 0x3F;

                reg |= t.setup;

                pci_write_config_byte(pdev, ARTIM23, reg);

                timing->reg58[adev->devno] = (t.active << 4) | t.recover;

        }

}

/**

 *      cmd640_qc_issue_prot    -       command preparation hook

 *      @qc: Command to be issued

 *

 *      Channel 1 has shared timings. We must reprogram the

 *      clock each drive 2/3 switch we do.

 */

static unsigned int cmd640_qc_issue_prot(struct ata_queued_cmd *qc)

{

        struct ata_port *ap = qc->ap;

        struct ata_device *adev = qc->dev;

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

        struct cmd640_reg *timing = ap->private_data;

        if (ap->port_no != 0 && adev->devno != timing->last) {

                pci_write_config_byte(pdev, DRWTIM23, timing->reg58[adev->devno]);

                timing->last = adev->devno;

        }

        return ata_qc_issue_prot(qc);

}

/**

 *      cmd640_port_start       -       port setup

 *      @ap: ATA port being set up

 *

 *      The CMD640 needs to maintain private data structures so we

 *      allocate space here.

 */

static int cmd640_port_start(struct ata_port *ap)

{

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

        struct cmd640_reg *timing;

        int ret = ata_sff_port_start(ap);

        if (ret < 0)

                return ret;

        timing = devm_kzalloc(&pdev->dev, sizeof(struct cmd640_reg), GFP_KERNEL);

        if (timing == NULL)

                return -ENOMEM;

        timing->last = -1;      /* Force a load */

        ap->private_data = timing;

        return ret;

}

static struct scsi_host_template cmd640_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 cmd640_port_ops = {

        .set_piomode    = cmd640_set_piomode,

        .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       = cmd640_qc_issue_prot,

        /* In theory this is not needed once we kill the prefetcher */

        .data_xfer      = ata_data_xfer_noirq,

        .irq_handler    = ata_interrupt,

        .irq_clear      = ata_bmdma_irq_clear,

        .irq_on         = ata_irq_on,

        .port_start     = cmd640_port_start,

};

static void cmd640_hardware_init(struct pci_dev *pdev)

{

        u8 r;

        u8 ctrl;

        /* CMD640 detected, commiserations */

        pci_write_config_byte(pdev, 0x5B, 0x00);

        /* Get version info */

        pci_read_config_byte(pdev, CFR, &r);

        /* PIO0 command cycles */

        pci_write_config_byte(pdev, CMDTIM, 0);

        /* 512 byte bursts (sector) */

        pci_write_config_byte(pdev, BRST, 0x40);

        /*

         * A reporter a long time ago

         * Had problems with the data fifo

         * So don't run the risk

         * Of putting crap on the disk

         * For its better just to go slow

         */

        /* Do channel 0 */

        pci_read_config_byte(pdev, CNTRL, &ctrl);

        pci_write_config_byte(pdev, CNTRL, ctrl | 0xC0);

        /* Ditto for channel 1 */

        pci_read_config_byte(pdev, ARTIM23, &ctrl);

        ctrl |= 0x0C;

        pci_write_config_byte(pdev, ARTIM23, ctrl);

}

static int cmd640_init_one(struct pci_dev *pdev, const struct pci_device_id *id)

{

        static const struct ata_port_info info = {

                .sht = &cmd640_sht,

                .flags = ATA_FLAG_SLAVE_POSS,

                .pio_mask = 0x1f,

                .port_ops = &cmd640_port_ops

        };

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

        cmd640_hardware_init(pdev);

        return ata_pci_init_one(pdev, ppi);

}

static int cmd640_reinit_one(struct pci_dev *pdev)

{

        cmd640_hardware_init(pdev);

#ifdef CONFIG_PM

        return ata_pci_device_resume(pdev);

#else

        return 0;

#endif

}

static const struct pci_device_id cmd640[] = {

        { PCI_VDEVICE(CMD, 0x640), 0 },

        { },

};

static struct pci_driver cmd640_pci_driver = {

        .name           = DRV_NAME,

        .id_table       = cmd640,

        .probe          = cmd640_init_one,

        .remove         = ata_pci_remove_one,

#ifdef CONFIG_PM

        .suspend        = ata_pci_device_suspend,

#endif

        .resume         = cmd640_reinit_one,

};

static int __init cmd640_init(void)

{

        return pci_register_driver(&cmd640_pci_driver);

}

static void __exit cmd640_exit(void)

{

        pci_unregister_driver(&cmd640_pci_driver);

}

MODULE_AUTHOR("Alan Cox");

MODULE_DESCRIPTION("low-level driver for CMD640 PATA controllers");

MODULE_LICENSE("GPL");

MODULE_DEVICE_TABLE(pci, cmd640);

MODULE_VERSION(DRV_VERSION);

module_init(cmd640_init);

module_exit(cmd640_exit);