Logo Search packages:      
Sourcecode: linux version File versions  Download package

pata_sc1200.c

/*
 * 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);

Generated by  Doxygen 1.6.0   Back to index