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/*

 * New ATA layer SC1200 driver          Alan Cox <alan@redhat.com>

 *

 * TODO: Mode selection filtering

 * TODO: Can't enable second channel until ATA core has serialize

 * TODO: Needs custom DMA cleanup code

 *

 * Based very heavily on

 *

 * linux/drivers/ide/pci/sc1200.c               Version 0.91    28-Jan-2003

 *

 * Copyright (C) 2000-2002              Mark Lord <mlord@pobox.com>

 * May be copied or modified under the terms of the GNU General Public License

 *

 * Development of this chipset driver was funded

 * by the nice folks at National Semiconductor.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 */

#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        "sc1200"

#define DRV_VERSION     "0.2.6"

#define SC1200_REV_A    0x00

#define SC1200_REV_B1   0x01

#define SC1200_REV_B3   0x02

#define SC1200_REV_C1   0x03

#define SC1200_REV_D1   0x04

/**

 *      sc1200_clock    -       PCI clock

 *

 *      Return the PCI bus clocking for the SC1200 chipset configuration

 *      in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz

 */

static int sc1200_clock(void)

{

        /* Magic registers that give us the chipset data */

        u8 chip_id = inb(0x903C);

        u8 silicon_rev = inb(0x903D);

        u16 pci_clock;

        if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1)

                return 0;        /* 33 MHz mode */

        /* Clock generator configuration 0x901E its 8/9 are the PCI clocking

           0/3 is 33Mhz 1 is 48 2 is 66 */

        pci_clock = inw(0x901E);

        pci_clock >>= 8;

        pci_clock &= 0x03;

        if (pci_clock == 3)

                pci_clock = 0;

        return pci_clock;

}

/**

 *      sc1200_set_piomode              -       PIO setup

 *      @ap: ATA interface

 *      @adev: device on the interface

 *

 *      Set our PIO requirements. This is fairly simple on the SC1200

 */

static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev)

{

        static const u32 pio_timings[4][5] = {

                {0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010},   // format0  33Mhz

                {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010},   // format1, 33Mhz

                {0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021},   // format1, 48Mhz

                {0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131}    // format1, 66Mhz

        };

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

        u32 format;

        unsigned int reg = 0x40 + 0x10 * ap->port_no;

        int mode = adev->pio_mode - XFER_PIO_0;

        pci_read_config_dword(pdev, reg + 4, &format);

        format >>= 31;

        format += sc1200_clock();

        pci_write_config_dword(pdev, reg + 8 * adev->devno,

                                pio_timings[format][mode]);

}

/**

 *      sc1200_set_dmamode              -       DMA timing setup

 *      @ap: ATA interface

 *      @adev: Device being configured

 *

 *      We cannot mix MWDMA and UDMA without reloading timings each switch

 *      master to slave.

 */

static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev)

{

        static const u32 udma_timing[3][3] = {

                { 0x00921250, 0x00911140, 0x00911030 },

                { 0x00932470, 0x00922260, 0x00922140 },

                { 0x009436A1, 0x00933481, 0x00923261 }

        };

        static const u32 mwdma_timing[3][3] = {

                { 0x00077771, 0x00012121, 0x00002020 },

                { 0x000BBBB2, 0x00024241, 0x00013131 },

                { 0x000FFFF3, 0x00035352, 0x00015151 }

        };

        int clock = sc1200_clock();

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

        unsigned int reg = 0x40 + 0x10 * ap->port_no;

        int mode = adev->dma_mode;

        u32 format;

        if (mode >= XFER_UDMA_0)

                format = udma_timing[clock][mode - XFER_UDMA_0];

        else

                format = mwdma_timing[clock][mode - XFER_MW_DMA_0];

        if (adev->devno == 0) {

                u32 timings;

                pci_read_config_dword(pdev, reg + 4, &timings);

                timings &= 0x80000000UL;

                timings |= format;

                pci_write_config_dword(pdev, reg + 4, timings);

        } else

                pci_write_config_dword(pdev, reg + 12, format);

}

/**

 *      sc1200_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.  Specifically we have a problem that there is only

 *      one MWDMA/UDMA bit.

 */

static unsigned int sc1200_qc_issue_prot(struct ata_queued_cmd *qc)

{

        struct ata_port *ap = qc->ap;

        struct ata_device *adev = qc->dev;

        struct ata_device *prev = ap->private_data;

        /* See if the DMA settings could be wrong */

        if (adev->dma_mode != 0 && adev != prev && prev != NULL) {

                /* Maybe, but do the channels match MWDMA/UDMA ? */

                if ((adev->dma_mode >= XFER_UDMA_0 && prev->dma_mode < XFER_UDMA_0) ||

                    (adev->dma_mode < XFER_UDMA_0 && prev->dma_mode >= XFER_UDMA_0))

                        /* Switch the mode bits */

                        sc1200_set_dmamode(ap, adev);

        }

        return ata_qc_issue_prot(qc);

}

static struct scsi_host_template sc1200_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_DUMB_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 sc1200_port_ops = {

        .set_piomode    = sc1200_set_piomode,

        .set_dmamode    = sc1200_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_dumb_qc_prep,

        .qc_issue       = sc1200_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,

};

/**

 *      sc1200_init_one         -       Initialise an SC1200

 *      @dev: PCI device

 *      @id: Entry in match table

 *

 *      Just throw the needed data at the libata helper and it does all

 *      our work.

 */

static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)

{

        static const struct ata_port_info info = {

                .sht = &sc1200_sht,

                .flags = ATA_FLAG_SLAVE_POSS,

                .pio_mask = 0x1f,

                .mwdma_mask = 0x07,

                .udma_mask = 0x07,

                .port_ops = &sc1200_port_ops

        };

        /* Can't enable port 2 yet, see top comments */

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

        return ata_pci_init_one(dev, ppi);

}

static const struct pci_device_id sc1200[] = {

        { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },

        { },

};

static struct pci_driver sc1200_pci_driver = {

        .name           = DRV_NAME,

        .id_table       = sc1200,

        .probe          = sc1200_init_one,

        .remove         = ata_pci_remove_one,

#ifdef CONFIG_PM

        .suspend        = ata_pci_device_suspend,

        .resume         = ata_pci_device_resume,

#endif

};

static int __init sc1200_init(void)

{

        return pci_register_driver(&sc1200_pci_driver);

}

static void __exit sc1200_exit(void)

{

        pci_unregister_driver(&sc1200_pci_driver);

}

MODULE_AUTHOR("Alan Cox, Mark Lord");

MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");

MODULE_LICENSE("GPL");

MODULE_DEVICE_TABLE(pci, sc1200);

MODULE_VERSION(DRV_VERSION);

module_init(sc1200_init);

module_exit(sc1200_exit);