drivers/ata/pata_triflex.c

   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/blkdev.h>
  40 #include <linux/delay.h>
  41 #include <scsi/scsi_host.h>
  42 #include <linux/libata.h>
  43
  44 #define DRV_NAME "pata_triflex"
  45 #define DRV_VERSION "0.2.8"
  46
  47 /**
  48  *      triflex_prereset                -       probe begin
  49  *      @link: ATA link
  50  *      @deadline: deadline jiffies for the operation
  51  *
  52  *      Set up cable type and use generic probe init
  53  */
  54
  55 static int triflex_prereset(struct ata_link *link, unsigned long deadline)
  56 {
  57         static const struct pci_bits triflex_enable_bits[] = {
  58                 { 0x80, 1, 0x01, 0x01 },
  59                 { 0x80, 1, 0x02, 0x02 }
  60         };
  61
  62         struct ata_port *ap = link->ap;
  63         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  64
  65         if (!pci_test_config_bits(pdev, &triflex_enable_bits[ap->port_no]))
  66                 return -ENOENT;
  67
  68         return ata_sff_prereset(link, deadline);
  69 }
  70
  71
  72
  73 /**
  74  *      triflex_load_timing             -       timing configuration
  75  *      @ap: ATA interface
  76  *      @adev: Device on the bus
  77  *      @speed: speed to configure
  78  *
  79  *      The Triflex has one set of timings per device per channel. This
  80  *      means we must do some switching. As the PIO and DMA timings don't
  81  *      match we have to do some reloading unlike PIIX devices where tuning
  82  *      tricks can avoid it.
  83  */
  84
  85 static void triflex_load_timing(struct ata_port *ap, struct ata_device *adev, int speed)
  86 {
  87         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  88         u32 timing = 0;
  89         u32 triflex_timing, old_triflex_timing;
  90         int channel_offset = ap->port_no ? 0x74: 0x70;
  91         unsigned int is_slave   = (adev->devno != 0);
  92
  93
  94         pci_read_config_dword(pdev, channel_offset, &old_triflex_timing);
  95         triflex_timing = old_triflex_timing;
  96
  97         switch(speed)
  98         {
  99                 case XFER_MW_DMA_2:
 100                         timing = 0x0103;break;
 101                 case XFER_MW_DMA_1:
 102                         timing = 0x0203;break;
 103                 case XFER_MW_DMA_0:
 104                         timing = 0x0808;break;
 105                 case XFER_SW_DMA_2:
 106                 case XFER_SW_DMA_1:
 107                 case XFER_SW_DMA_0:
 108                         timing = 0x0F0F;break;
 109                 case XFER_PIO_4:
 110                         timing = 0x0202;break;
 111                 case XFER_PIO_3:
 112                         timing = 0x0204;break;
 113                 case XFER_PIO_2:
 114                         timing = 0x0404;break;
 115                 case XFER_PIO_1:
 116                         timing = 0x0508;break;
 117                 case XFER_PIO_0:
 118                         timing = 0x0808;break;
 119                 default:
 120                         BUG();
 121         }
 122         triflex_timing &= ~ (0xFFFF << (16 * is_slave));
 123         triflex_timing |= (timing << (16 * is_slave));
 124
 125         if (triflex_timing != old_triflex_timing)
 126                 pci_write_config_dword(pdev, channel_offset, triflex_timing);
 127 }
 128
 129 /**
 130  *      triflex_set_piomode     -       set initial PIO mode data
 131  *      @ap: ATA interface
 132  *      @adev: ATA device
 133  *
 134  *      Use the timing loader to set up the PIO mode. We have to do this
 135  *      because DMA start/stop will only be called once DMA occurs. If there
 136  *      has been no DMA then the PIO timings are still needed.
 137  */
 138 static void triflex_set_piomode(struct ata_port *ap, struct ata_device *adev)
 139 {
 140         triflex_load_timing(ap, adev, adev->pio_mode);
 141 }
 142
 143 /**
 144  *      triflex_dma_start       -       DMA start callback
 145  *      @qc: Command in progress
 146  *
 147  *      Usually drivers set the DMA timing at the point the set_dmamode call
 148  *      is made. Triflex however requires we load new timings on the
 149  *      transition or keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc).
 150  *      We load the DMA timings just before starting DMA and then restore
 151  *      the PIO timing when the DMA is finished.
 152  */
 153
 154 static void triflex_bmdma_start(struct ata_queued_cmd *qc)
 155 {
 156         triflex_load_timing(qc->ap, qc->dev, qc->dev->dma_mode);
 157         ata_bmdma_start(qc);
 158 }
 159
 160 /**
 161  *      triflex_dma_stop        -       DMA stop callback
 162  *      @ap: ATA interface
 163  *      @adev: ATA device
 164  *
 165  *      We loaded new timings in dma_start, as a result we need to restore
 166  *      the PIO timings in dma_stop so that the next command issue gets the
 167  *      right clock values.
 168  */
 169
 170 static void triflex_bmdma_stop(struct ata_queued_cmd *qc)
 171 {
 172         ata_bmdma_stop(qc);
 173         triflex_load_timing(qc->ap, qc->dev, qc->dev->pio_mode);
 174 }
 175
 176 static struct scsi_host_template triflex_sht = {
 177         ATA_BMDMA_SHT(DRV_NAME),
 178 };
 179
 180 static struct ata_port_operations triflex_port_ops = {
 181         .inherits       = &ata_bmdma_port_ops,
 182         .bmdma_start    = triflex_bmdma_start,
 183         .bmdma_stop     = triflex_bmdma_stop,
 184         .cable_detect   = ata_cable_40wire,
 185         .set_piomode    = triflex_set_piomode,
 186         .prereset       = triflex_prereset,
 187 };
 188
 189 static int triflex_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 190 {
 191         static const struct ata_port_info info = {
 192                 .flags = ATA_FLAG_SLAVE_POSS,
 193                 .pio_mask = ATA_PIO4,
 194                 .mwdma_mask = ATA_MWDMA2,
 195                 .port_ops = &triflex_port_ops
 196         };
 197         const struct ata_port_info *ppi[] = { &info, NULL };
 198
 199         ata_print_version_once(&dev->dev, DRV_VERSION);
 200
 201         return ata_pci_bmdma_init_one(dev, ppi, &triflex_sht, NULL, 0);
 202 }
 203
 204 static const struct pci_device_id triflex[] = {
 205         { PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), },
 206
 207         { },
 208 };
 209
 210 #ifdef CONFIG_PM
 211 static int triflex_ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
 212 {
 213         struct ata_host *host = pci_get_drvdata(pdev);
 214         int rc = 0;
 215
 216         rc = ata_host_suspend(host, mesg);
 217         if (rc)
 218                 return rc;
 219
 220         /*
 221          * We must not disable or powerdown the device.
 222          * APM bios refuses to suspend if IDE is not accessible.
 223          */
 224         pci_save_state(pdev);
 225
 226         return 0;
 227 }
 228
 229 #endif
 230
 231 static struct pci_driver triflex_pci_driver = {
 232         .name           = DRV_NAME,
 233         .id_table       = triflex,
 234         .probe          = triflex_init_one,
 235         .remove         = ata_pci_remove_one,
 236 #ifdef CONFIG_PM
 237         .suspend        = triflex_ata_pci_device_suspend,
 238         .resume         = ata_pci_device_resume,
 239 #endif
 240 };
 241
 242 module_pci_driver(triflex_pci_driver);
 243
 244 MODULE_AUTHOR("Alan Cox");
 245 MODULE_DESCRIPTION("low-level driver for Compaq Triflex");
 246 MODULE_LICENSE("GPL");
 247 MODULE_DEVICE_TABLE(pci, triflex);
 248 MODULE_VERSION(DRV_VERSION);