V4L/DVB (6715): ivtv: Remove unnecessary register update

[linux-2.6/verdex.git] / drivers / ata / pata_qdi.c

/*
 *    pata_qdi.c - QDI VLB ATA controllers
 *      (C) 2006 Red Hat <alan@redhat.com>
 *
 * This driver mostly exists as a proof of concept for non PCI devices under
 * libata. While the QDI6580 was 'neat' in 1993 it is no longer terribly
 * useful.
 *
 * Tuning code written from the documentation at
 * http://www.ryston.cz/petr/vlb/qd6500.html
 * http://www.ryston.cz/petr/vlb/qd6580.html
 *
 * Probe code based on drivers/ide/legacy/qd65xx.c
 * Rewritten from the work of Colten Edwards <pje120@cs.usask.ca> by
 * Samuel Thibault <samuel.thibault@fnac.net>
 */

#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>
#include <linux/platform_device.h>

#define DRV_NAME "pata_qdi"
#define DRV_VERSION "0.3.1"

#define NR_HOST 4       /* Two 6580s */

struct qdi_data {
        unsigned long timing;
        u8 clock[2];
        u8 last;
        int fast;
        struct platform_device *platform_dev;

};

static struct ata_host *qdi_host[NR_HOST];
static struct qdi_data qdi_data[NR_HOST];
static int nr_qdi_host;

#ifdef MODULE
static int probe_qdi = 1;
#else
static int probe_qdi;
#endif

static void qdi6500_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
        struct ata_timing t;
        struct qdi_data *qdi = ap->host->private_data;
        int active, recovery;
        u8 timing;

        /* Get the timing data in cycles */
        ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000);

        if (qdi->fast) {
                active = 8 - FIT(t.active, 1, 8);
                recovery = 18 - FIT(t.recover, 3, 18);
        } else {
                active = 9 - FIT(t.active, 2, 9);
                recovery = 15 - FIT(t.recover, 0, 15);
        }
        timing = (recovery << 4) | active | 0x08;

        qdi->clock[adev->devno] = timing;

        outb(timing, qdi->timing);
}

static void qdi6580_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
        struct ata_timing t;
        struct qdi_data *qdi = ap->host->private_data;
        int active, recovery;
        u8 timing;

        /* Get the timing data in cycles */
        ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000);

        if (qdi->fast) {
                active = 8 - FIT(t.active, 1, 8);
                recovery = 18 - FIT(t.recover, 3, 18);
        } else {
                active = 9 - FIT(t.active, 2, 9);
                recovery = 15 - FIT(t.recover, 0, 15);
        }
        timing = (recovery << 4) | active | 0x08;

        qdi->clock[adev->devno] = timing;

        outb(timing, qdi->timing);

        /* Clear the FIFO */
        if (adev->class != ATA_DEV_ATA)
                outb(0x5F, (qdi->timing & 0xFFF0) + 3);
}

/**
 *      qdi_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.
 */

static unsigned int qdi_qc_issue_prot(struct ata_queued_cmd *qc)
{
        struct ata_port *ap = qc->ap;
        struct ata_device *adev = qc->dev;
        struct qdi_data *qdi = ap->host->private_data;

        if (qdi->clock[adev->devno] != qdi->last) {
                if (adev->pio_mode) {
                        qdi->last = qdi->clock[adev->devno];
                        outb(qdi->clock[adev->devno], qdi->timing);
                }
        }
        return ata_qc_issue_prot(qc);
}

static void qdi_data_xfer(struct ata_device *adev, unsigned char *buf, unsigned int buflen, int write_data)
{
        struct ata_port *ap = adev->link->ap;
        int slop = buflen & 3;

        if (ata_id_has_dword_io(adev->id)) {
                if (write_data)
                        iowrite32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);
                else
                        ioread32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);

                if (unlikely(slop)) {
                        __le32 pad = 0;
                        if (write_data) {
                                memcpy(&pad, buf + buflen - slop, slop);
                                iowrite32(le32_to_cpu(pad), ap->ioaddr.data_addr);
                        } else {
                                pad = cpu_to_le32(ioread32(ap->ioaddr.data_addr));
                                memcpy(buf + buflen - slop, &pad, slop);
                        }
                }
        } else
                ata_data_xfer(adev, buf, buflen, write_data);
}

static struct scsi_host_template qdi_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 qdi6500_port_ops = {
        .set_piomode    = qdi6500_set_piomode,

        .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,

        .qc_prep        = ata_qc_prep,
        .qc_issue       = qdi_qc_issue_prot,

        .data_xfer      = qdi_data_xfer,

        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,

        .port_start     = ata_sff_port_start,
};

static struct ata_port_operations qdi6580_port_ops = {
        .set_piomode    = qdi6580_set_piomode,

        .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,

        .qc_prep        = ata_qc_prep,
        .qc_issue       = qdi_qc_issue_prot,

        .data_xfer      = qdi_data_xfer,

        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,

        .port_start     = ata_sff_port_start,
};

/**
 *      qdi_init_one            -       attach a qdi interface
 *      @type: Type to display
 *      @io: I/O port start
 *      @irq: interrupt line
 *      @fast: True if on a > 33Mhz VLB
 *
 *      Register an ISA bus IDE interface. Such interfaces are PIO and we
 *      assume do not support IRQ sharing.
 */

static __init int qdi_init_one(unsigned long port, int type, unsigned long io, int irq, int fast)
{
        unsigned long ctl = io + 0x206;
        struct platform_device *pdev;
        struct ata_host *host;
        struct ata_port *ap;
        void __iomem *io_addr, *ctl_addr;
        int ret;

        /*
         *      Fill in a probe structure first of all
         */

        pdev = platform_device_register_simple(DRV_NAME, nr_qdi_host, NULL, 0);
        if (IS_ERR(pdev))
                return PTR_ERR(pdev);

        ret = -ENOMEM;
        io_addr = devm_ioport_map(&pdev->dev, io, 8);
        ctl_addr = devm_ioport_map(&pdev->dev, ctl, 1);
        if (!io_addr || !ctl_addr)
                goto fail;

        ret = -ENOMEM;
        host = ata_host_alloc(&pdev->dev, 1);
        if (!host)
                goto fail;
        ap = host->ports[0];

        if (type == 6580) {
                ap->ops = &qdi6580_port_ops;
                ap->pio_mask = 0x1F;
                ap->flags |= ATA_FLAG_SLAVE_POSS;
        } else {
                ap->ops = &qdi6500_port_ops;
                ap->pio_mask = 0x07;    /* Actually PIO3 !IORDY is possible */
                ap->flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
        }

        ap->ioaddr.cmd_addr = io_addr;
        ap->ioaddr.altstatus_addr = ctl_addr;
        ap->ioaddr.ctl_addr = ctl_addr;
        ata_std_ports(&ap->ioaddr);

        ata_port_desc(ap, "cmd %lx ctl %lx", io, ctl);

        /*
         *      Hook in a private data structure per channel
         */
        ap->private_data = &qdi_data[nr_qdi_host];

        qdi_data[nr_qdi_host].timing = port;
        qdi_data[nr_qdi_host].fast = fast;
        qdi_data[nr_qdi_host].platform_dev = pdev;

        printk(KERN_INFO DRV_NAME": qd%d at 0x%lx.\n", type, io);

        /* activate */
        ret = ata_host_activate(host, irq, ata_interrupt, 0, &qdi_sht);
        if (ret)
                goto fail;

        qdi_host[nr_qdi_host++] = dev_get_drvdata(&pdev->dev);
        return 0;

 fail:
        platform_device_unregister(pdev);
        return ret;
}

/**
 *      qdi_init                -       attach qdi interfaces
 *
 *      Attach qdi IDE interfaces by scanning the ports it may occupy.
 */

static __init int qdi_init(void)
{
        unsigned long flags;
        static const unsigned long qd_port[2] = { 0x30, 0xB0 };
        static const unsigned long ide_port[2] = { 0x170, 0x1F0 };
        static const int ide_irq[2] = { 14, 15 };

        int ct = 0;
        int i;

        if (probe_qdi == 0)
                return -ENODEV;

        /*
         *      Check each possible QD65xx base address
         */

        for (i = 0; i < 2; i++) {
                unsigned long port = qd_port[i];
                u8 r, res;


                if (request_region(port, 2, "pata_qdi")) {
                        /* Check for a card */
                        local_irq_save(flags);
                        r = inb_p(port);
                        outb_p(0x19, port);
                        res = inb_p(port);
                        outb_p(r, port);
                        local_irq_restore(flags);

                        /* Fail */
                        if (res == 0x19)
                        {
                                release_region(port, 2);
                                continue;
                        }

                        /* Passes the presence test */
                        r = inb_p(port + 1);    /* Check port agrees with port set */
                        if ((r & 2) >> 1 != i) {
                                release_region(port, 2);
                                continue;
                        }

                        /* Check card type */
                        if ((r & 0xF0) == 0xC0) {
                                /* QD6500: single channel */
                                if (r & 8) {
                                        /* Disabled ? */
                                        release_region(port, 2);
                                        continue;
                                }
                                if (qdi_init_one(port, 6500, ide_port[r & 0x01], ide_irq[r & 0x01], r & 0x04) == 0)
                                        ct++;
                        }
                        if (((r & 0xF0) == 0xA0) || (r & 0xF0) == 0x50) {
                                /* QD6580: dual channel */
                                if (!request_region(port + 2 , 2, "pata_qdi"))
                                {
                                        release_region(port, 2);
                                        continue;
                                }
                                res = inb(port + 3);
                                if (res & 1) {
                                        /* Single channel mode */
                                        if (qdi_init_one(port, 6580, ide_port[r & 0x01], ide_irq[r & 0x01], r & 0x04) == 0)
                                                ct++;
                                } else {
                                        /* Dual channel mode */
                                        if (qdi_init_one(port, 6580, 0x1F0, 14, r & 0x04) == 0)
                                                ct++;
                                        if (qdi_init_one(port + 2, 6580, 0x170, 15, r & 0x04) == 0)
                                                ct++;
                                }
                        }
                }
        }
        if (ct != 0)
                return 0;
        return -ENODEV;
}

static __exit void qdi_exit(void)
{
        int i;

        for (i = 0; i < nr_qdi_host; i++) {
                ata_host_detach(qdi_host[i]);
                /* Free the control resource. The 6580 dual channel has the resources
                 * claimed as a pair of 2 byte resources so we need no special cases...
                 */
                release_region(qdi_data[i].timing, 2);
                platform_device_unregister(qdi_data[i].platform_dev);
        }
}

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for qdi ATA");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

module_init(qdi_init);
module_exit(qdi_exit);

module_param(probe_qdi, int, 0);