linux/drivers/ata/pata_triflex.c
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   1/*
   2 * pata_triflex.c       - Compaq PATA for new ATA layer
   3 *                        (C) 2005 Red Hat Inc
   4 *                        Alan Cox <alan@lxorguk.ukuu.org.uk>
   5 *
   6 * based upon
   7 *
   8 * triflex.c
   9 *
  10 * IDE Chipset driver for the Compaq TriFlex IDE controller.
  11 *
  12 * Known to work with the Compaq Workstation 5x00 series.
  13 *
  14 * Copyright (C) 2002 Hewlett-Packard Development Group, L.P.
  15 * Author: Torben Mathiasen <torben.mathiasen@hp.com>
  16 *
  17 * This program is free software; you can redistribute it and/or modify
  18 * it under the terms of the GNU General Public License version 2 as
  19 * published by the Free Software Foundation.
  20 *
  21 * This program is distributed in the hope that it will be useful,
  22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24 * GNU General Public License for more details.
  25 *
  26 * You should have received a copy of the GNU General Public License
  27 * along with this program; if not, write to the Free Software
  28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  29 *
  30 * Loosely based on the piix & svwks drivers.
  31 *
  32 * Documentation:
  33 *      Not publicly available.
  34 */
  35
  36#include <linux/kernel.h>
  37#include <linux/module.h>
  38#include <linux/pci.h>
  39#include <linux/init.h>
  40#include <linux/blkdev.h>
  41#include <linux/delay.h>
  42#include <scsi/scsi_host.h>
  43#include <linux/libata.h>
  44
  45#define DRV_NAME "pata_triflex"
  46#define DRV_VERSION "0.2.8"
  47
  48/**
  49 *      triflex_prereset                -       probe begin
  50 *      @link: ATA link
  51 *      @deadline: deadline jiffies for the operation
  52 *
  53 *      Set up cable type and use generic probe init
  54 */
  55
  56static int triflex_prereset(struct ata_link *link, unsigned long deadline)
  57{
  58        static const struct pci_bits triflex_enable_bits[] = {
  59                { 0x80, 1, 0x01, 0x01 },
  60                { 0x80, 1, 0x02, 0x02 }
  61        };
  62
  63        struct ata_port *ap = link->ap;
  64        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  65
  66        if (!pci_test_config_bits(pdev, &triflex_enable_bits[ap->port_no]))
  67                return -ENOENT;
  68
  69        return ata_sff_prereset(link, deadline);
  70}
  71
  72
  73
  74/**
  75 *      triflex_load_timing             -       timing configuration
  76 *      @ap: ATA interface
  77 *      @adev: Device on the bus
  78 *      @speed: speed to configure
  79 *
  80 *      The Triflex has one set of timings per device per channel. This
  81 *      means we must do some switching. As the PIO and DMA timings don't
  82 *      match we have to do some reloading unlike PIIX devices where tuning
  83 *      tricks can avoid it.
  84 */
  85
  86static void triflex_load_timing(struct ata_port *ap, struct ata_device *adev, int speed)
  87{
  88        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  89        u32 timing = 0;
  90        u32 triflex_timing, old_triflex_timing;
  91        int channel_offset = ap->port_no ? 0x74: 0x70;
  92        unsigned int is_slave   = (adev->devno != 0);
  93
  94
  95        pci_read_config_dword(pdev, channel_offset, &old_triflex_timing);
  96        triflex_timing = old_triflex_timing;
  97
  98        switch(speed)
  99        {
 100                case XFER_MW_DMA_2:
 101                        timing = 0x0103;break;
 102                case XFER_MW_DMA_1:
 103                        timing = 0x0203;break;
 104                case XFER_MW_DMA_0:
 105                        timing = 0x0808;break;
 106                case XFER_SW_DMA_2:
 107                case XFER_SW_DMA_1:
 108                case XFER_SW_DMA_0:
 109                        timing = 0x0F0F;break;
 110                case XFER_PIO_4:
 111                        timing = 0x0202;break;
 112                case XFER_PIO_3:
 113                        timing = 0x0204;break;
 114                case XFER_PIO_2:
 115                        timing = 0x0404;break;
 116                case XFER_PIO_1:
 117                        timing = 0x0508;break;
 118                case XFER_PIO_0:
 119                        timing = 0x0808;break;
 120                default:
 121                        BUG();
 122        }
 123        triflex_timing &= ~ (0xFFFF << (16 * is_slave));
 124        triflex_timing |= (timing << (16 * is_slave));
 125
 126        if (triflex_timing != old_triflex_timing)
 127                pci_write_config_dword(pdev, channel_offset, triflex_timing);
 128}
 129
 130/**
 131 *      triflex_set_piomode     -       set initial PIO mode data
 132 *      @ap: ATA interface
 133 *      @adev: ATA device
 134 *
 135 *      Use the timing loader to set up the PIO mode. We have to do this
 136 *      because DMA start/stop will only be called once DMA occurs. If there
 137 *      has been no DMA then the PIO timings are still needed.
 138 */
 139static void triflex_set_piomode(struct ata_port *ap, struct ata_device *adev)
 140{
 141        triflex_load_timing(ap, adev, adev->pio_mode);
 142}
 143
 144/**
 145 *      triflex_dma_start       -       DMA start callback
 146 *      @qc: Command in progress
 147 *
 148 *      Usually drivers set the DMA timing at the point the set_dmamode call
 149 *      is made. Triflex however requires we load new timings on the
 150 *      transition or keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc).
 151 *      We load the DMA timings just before starting DMA and then restore
 152 *      the PIO timing when the DMA is finished.
 153 */
 154
 155static void triflex_bmdma_start(struct ata_queued_cmd *qc)
 156{
 157        triflex_load_timing(qc->ap, qc->dev, qc->dev->dma_mode);
 158        ata_bmdma_start(qc);
 159}
 160
 161/**
 162 *      triflex_dma_stop        -       DMA stop callback
 163 *      @ap: ATA interface
 164 *      @adev: ATA device
 165 *
 166 *      We loaded new timings in dma_start, as a result we need to restore
 167 *      the PIO timings in dma_stop so that the next command issue gets the
 168 *      right clock values.
 169 */
 170
 171static void triflex_bmdma_stop(struct ata_queued_cmd *qc)
 172{
 173        ata_bmdma_stop(qc);
 174        triflex_load_timing(qc->ap, qc->dev, qc->dev->pio_mode);
 175}
 176
 177static struct scsi_host_template triflex_sht = {
 178        ATA_BMDMA_SHT(DRV_NAME),
 179};
 180
 181static struct ata_port_operations triflex_port_ops = {
 182        .inherits       = &ata_bmdma_port_ops,
 183        .bmdma_start    = triflex_bmdma_start,
 184        .bmdma_stop     = triflex_bmdma_stop,
 185        .cable_detect   = ata_cable_40wire,
 186        .set_piomode    = triflex_set_piomode,
 187        .prereset       = triflex_prereset,
 188};
 189
 190static int triflex_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 191{
 192        static const struct ata_port_info info = {
 193                .flags = ATA_FLAG_SLAVE_POSS,
 194                .pio_mask = ATA_PIO4,
 195                .mwdma_mask = ATA_MWDMA2,
 196                .port_ops = &triflex_port_ops
 197        };
 198        const struct ata_port_info *ppi[] = { &info, NULL };
 199
 200        ata_print_version_once(&dev->dev, DRV_VERSION);
 201
 202        return ata_pci_bmdma_init_one(dev, ppi, &triflex_sht, NULL, 0);
 203}
 204
 205static const struct pci_device_id triflex[] = {
 206        { PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), },
 207
 208        { },
 209};
 210
 211#ifdef CONFIG_PM
 212static int triflex_ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
 213{
 214        struct ata_host *host = dev_get_drvdata(&pdev->dev);
 215        int rc = 0;
 216
 217        rc = ata_host_suspend(host, mesg);
 218        if (rc)
 219                return rc;
 220
 221        /*
 222         * We must not disable or powerdown the device.
 223         * APM bios refuses to suspend if IDE is not accessible.
 224         */
 225        pci_save_state(pdev);
 226
 227        return 0;
 228}
 229
 230#endif
 231
 232static struct pci_driver triflex_pci_driver = {
 233        .name           = DRV_NAME,
 234        .id_table       = triflex,
 235        .probe          = triflex_init_one,
 236        .remove         = ata_pci_remove_one,
 237#ifdef CONFIG_PM
 238        .suspend        = triflex_ata_pci_device_suspend,
 239        .resume         = ata_pci_device_resume,
 240#endif
 241};
 242
 243module_pci_driver(triflex_pci_driver);
 244
 245MODULE_AUTHOR("Alan Cox");
 246MODULE_DESCRIPTION("low-level driver for Compaq Triflex");
 247MODULE_LICENSE("GPL");
 248MODULE_DEVICE_TABLE(pci, triflex);
 249MODULE_VERSION(DRV_VERSION);
 250
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