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/*

 *    pata_winbond.c - Winbond VLB ATA controllers

 *      (C) 2006 Red Hat <alan@redhat.com>

 *

 *    Support for the Winbond 83759A when operating in advanced mode.

 *    Multichip mode is not currently supported.

 */

#include <linux/kernel.h>

#include <linux/module.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_winbond"

#define DRV_VERSION "0.0.3"

#define NR_HOST 4       /* Two winbond controllers, two channels each */

struct winbond_data {

        unsigned long config;

        struct platform_device *platform_dev;

};

static struct ata_host *winbond_host[NR_HOST];

static struct winbond_data winbond_data[NR_HOST];

static int nr_winbond_host;

#ifdef MODULE

static int probe_winbond = 1;

#else

static int probe_winbond;

#endif

static DEFINE_SPINLOCK(winbond_lock);

static void winbond_writecfg(unsigned long port, u8 reg, u8 val)

{

        unsigned long flags;

        spin_lock_irqsave(&winbond_lock, flags);

        outb(reg, port + 0x01);

        outb(val, port + 0x02);

        spin_unlock_irqrestore(&winbond_lock, flags);

}

static u8 winbond_readcfg(unsigned long port, u8 reg)

{

        u8 val;

        unsigned long flags;

        spin_lock_irqsave(&winbond_lock, flags);

        outb(reg, port + 0x01);

        val = inb(port + 0x02);

        spin_unlock_irqrestore(&winbond_lock, flags);

        return val;

}

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

{

        struct ata_timing t;

        struct winbond_data *winbond = ap->host->private_data;

        int active, recovery;

        u8 reg;

        int timing = 0x88 + (ap->port_no * 4) + (adev->devno * 2);

        reg = winbond_readcfg(winbond->config, 0x81);

        /* Get the timing data in cycles */

        if (reg & 0x40)         /* Fast VLB bus, assume 50MHz */

                ata_timing_compute(adev, adev->pio_mode, &t, 20000, 1000);

        else

                ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000);

        active = (FIT(t.active, 3, 17) - 1) & 0x0F;

        recovery = (FIT(t.recover, 1, 15) + 1) & 0x0F;

        timing = (active << 4) | recovery;

        winbond_writecfg(winbond->config, timing, reg);

        /* Load the setup timing */

        reg = 0x35;

        if (adev->class != ATA_DEV_ATA)

                reg |= 0x08;    /* FIFO off */

        if (!ata_pio_need_iordy(adev))

                reg |= 0x02;    /* IORDY off */

        reg |= (FIT(t.setup, 0, 3) << 6);

        winbond_writecfg(winbond->config, timing + 1, reg);

}

static void winbond_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 winbond_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 winbond_port_ops = {

        .set_piomode    = winbond_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       = ata_qc_issue_prot,

        .data_xfer      = winbond_data_xfer,

        .irq_clear      = ata_bmdma_irq_clear,

        .irq_on         = ata_irq_on,

        .port_start     = ata_sff_port_start,

};

/**

 *      winbond_init_one                -       attach a winbond interface

 *      @type: Type to display

 *      @io: I/O port start

 *      @irq: interrupt line

 *      @fast: True if on a > 33Mhz VLB

 *

 *      Register a VLB bus IDE interface. Such interfaces are PIO and we

 *      assume do not support IRQ sharing.

 */

static __init int winbond_init_one(unsigned long port)

{

        struct platform_device *pdev;

        u8 reg;

        int i, rc;

        reg = winbond_readcfg(port, 0x81);

        reg |= 0x80;    /* jumpered mode off */

        winbond_writecfg(port, 0x81, reg);

        reg = winbond_readcfg(port, 0x83);

        reg |= 0xF0;    /* local control */

        winbond_writecfg(port, 0x83, reg);

        reg = winbond_readcfg(port, 0x85);

        reg |= 0xF0;    /* programmable timing */

        winbond_writecfg(port, 0x85, reg);

        reg = winbond_readcfg(port, 0x81);

        if (!(reg & 0x03))              /* Disabled */

                return 0;

        for (i = 0; i < 2 ; i ++) {

                unsigned long cmd_port = 0x1F0 - (0x80 * i);

                unsigned long ctl_port = cmd_port + 0x206;

                struct ata_host *host;

                struct ata_port *ap;

                void __iomem *cmd_addr, *ctl_addr;

                if (!(reg & (1 << i)))

                        continue;

                pdev = platform_device_register_simple(DRV_NAME, nr_winbond_host, NULL, 0);

                if (IS_ERR(pdev))

                        return PTR_ERR(pdev);

                rc = -ENOMEM;

                host = ata_host_alloc(&pdev->dev, 1);

                if (!host)

                        goto err_unregister;

                ap = host->ports[0];

                rc = -ENOMEM;

                cmd_addr = devm_ioport_map(&pdev->dev, cmd_port, 8);

                ctl_addr = devm_ioport_map(&pdev->dev, ctl_port, 1);

                if (!cmd_addr || !ctl_addr)

                        goto err_unregister;

                ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", cmd_port, ctl_port);

                ap->ops = &winbond_port_ops;

                ap->pio_mask = 0x1F;

                ap->flags |= ATA_FLAG_SLAVE_POSS;

                ap->ioaddr.cmd_addr = cmd_addr;

                ap->ioaddr.altstatus_addr = ctl_addr;

                ap->ioaddr.ctl_addr = ctl_addr;

                ata_std_ports(&ap->ioaddr);

                /* hook in a private data structure per channel */

                host->private_data = &winbond_data[nr_winbond_host];

                winbond_data[nr_winbond_host].config = port;

                winbond_data[nr_winbond_host].platform_dev = pdev;

                /* activate */

                rc = ata_host_activate(host, 14 + i, ata_interrupt, 0,

                                       &winbond_sht);

                if (rc)

                        goto err_unregister;

                winbond_host[nr_winbond_host++] = dev_get_drvdata(&pdev->dev);

        }

        return 0;

 err_unregister:

        platform_device_unregister(pdev);

        return rc;

}

/**

 *      winbond_init            -       attach winbond interfaces

 *

 *      Attach winbond IDE interfaces by scanning the ports it may occupy.

 */

static __init int winbond_init(void)

{

        static const unsigned long config[2] = { 0x130, 0x1B0 };

        int ct = 0;

        int i;

        if (probe_winbond == 0)

                return -ENODEV;

        /*

         *      Check both base addresses

         */

        for (i = 0; i < 2; i++) {

                if (probe_winbond & (1<<i)) {

                        int ret = 0;

                        unsigned long port = config[i];

                        if (request_region(port, 2, "pata_winbond")) {

                                ret = winbond_init_one(port);

                                if (ret <= 0)

                                        release_region(port, 2);

                                else ct+= ret;

                        }

                }

        }

        if (ct != 0)

                return 0;

        return -ENODEV;

}

static __exit void winbond_exit(void)

{

        int i;

        for (i = 0; i < nr_winbond_host; i++) {

                ata_host_detach(winbond_host[i]);

                release_region(winbond_data[i].config, 2);

                platform_device_unregister(winbond_data[i].platform_dev);

        }

}

MODULE_AUTHOR("Alan Cox");

MODULE_DESCRIPTION("low-level driver for Winbond VL ATA");

MODULE_LICENSE("GPL");

MODULE_VERSION(DRV_VERSION);

module_init(winbond_init);

module_exit(winbond_exit);

module_param(probe_winbond, int, 0);