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@redhat.com>
   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 publically 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 "0.2.5"
  47
  48 /**
  49  *      triflex_prereset                -       probe begin
  50  *      @ap: ATA port
  51  *
  52  *      Set up cable type and use generic probe init
  53  */
  54
  55 static int triflex_prereset(struct ata_port *ap)
  56 {
  57         static const struct pci_bits triflex_enable_bits[] = {
  58                 { 0x80, 1, 0x01, 0x01 },
  59                 { 0x80, 1, 0x02, 0x02 }
  60         };
  61
  62         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  63
  64         if (!pci_test_config_bits(pdev, &triflex_enable_bits[ap->port_no]))
  65                 return -ENOENT;
  66         ap->cbl = ATA_CBL_PATA40;
  67         return ata_std_prereset(ap);
  68 }
  69
  70
  71
  72 static void triflex_error_handler(struct ata_port *ap)
  73 {
  74         ata_bmdma_drive_eh(ap, triflex_prereset, ata_std_softreset, NULL, ata_std_postreset);
  75 }
  76
  77 /**
  78  *      triflex_load_timing             -       timing configuration
  79  *      @ap: ATA interface
  80  *      @adev: Device on the bus
  81  *      @speed: speed to configure
  82  *
  83  *      The Triflex has one set of timings per device per channel. This
  84  *      means we must do some switching. As the PIO and DMA timings don't
  85  *      match we have to do some reloading unlike PIIX devices where tuning
  86  *      tricks can avoid it.
  87  */
  88
  89 static void triflex_load_timing(struct ata_port *ap, struct ata_device *adev, int speed)
  90 {
  91         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  92         u32 timing = 0;
  93         u32 triflex_timing, old_triflex_timing;
  94         int channel_offset = ap->port_no ? 0x74: 0x70;
  95         unsigned int is_slave   = (adev->devno != 0);
  96
  97
  98         pci_read_config_dword(pdev, channel_offset, &old_triflex_timing);
  99         triflex_timing = old_triflex_timing;
 100
 101         switch(speed)
 102         {
 103                 case XFER_MW_DMA_2:
 104                         timing = 0x0103;break;
 105                 case XFER_MW_DMA_1:
 106                         timing = 0x0203;break;
 107                 case XFER_MW_DMA_0:
 108                         timing = 0x0808;break;
 109                 case XFER_SW_DMA_2:
 110                 case XFER_SW_DMA_1:
 111                 case XFER_SW_DMA_0:
 112                         timing = 0x0F0F;break;
 113                 case XFER_PIO_4:
 114                         timing = 0x0202;break;
 115                 case XFER_PIO_3:
 116                         timing = 0x0204;break;
 117                 case XFER_PIO_2:
 118                         timing = 0x0404;break;
 119                 case XFER_PIO_1:
 120                         timing = 0x0508;break;
 121                 case XFER_PIO_0:
 122                         timing = 0x0808;break;
 123                 default:
 124                         BUG();
 125         }
 126         triflex_timing &= ~ (0xFFFF << (16 * is_slave));
 127         triflex_timing |= (timing << (16 * is_slave));
 128
 129         if (triflex_timing != old_triflex_timing)
 130                 pci_write_config_dword(pdev, channel_offset, triflex_timing);
 131 }
 132
 133 /**
 134  *      triflex_set_piomode     -       set initial PIO mode data
 135  *      @ap: ATA interface
 136  *      @adev: ATA device
 137  *
 138  *      Use the timing loader to set up the PIO mode. We have to do this
 139  *      because DMA start/stop will only be called once DMA occurs. If there
 140  *      has been no DMA then the PIO timings are still needed.
 141  */
 142 static void triflex_set_piomode(struct ata_port *ap, struct ata_device *adev)
 143 {
 144         triflex_load_timing(ap, adev, adev->pio_mode);
 145 }
 146
 147 /**
 148  *      triflex_dma_start       -       DMA start callback
 149  *      @qc: Command in progress
 150  *
 151  *      Usually drivers set the DMA timing at the point the set_dmamode call
 152  *      is made. Triflex however requires we load new timings on the
 153  *      transition or keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc).
 154  *      We load the DMA timings just before starting DMA and then restore
 155  *      the PIO timing when the DMA is finished.
 156  */
 157
 158 static void triflex_bmdma_start(struct ata_queued_cmd *qc)
 159 {
 160         triflex_load_timing(qc->ap, qc->dev, qc->dev->dma_mode);
 161         ata_bmdma_start(qc);
 162 }
 163
 164 /**
 165  *      triflex_dma_stop        -       DMA stop callback
 166  *      @ap: ATA interface
 167  *      @adev: ATA device
 168  *
 169  *      We loaded new timings in dma_start, as a result we need to restore
 170  *      the PIO timings in dma_stop so that the next command issue gets the
 171  *      right clock values.
 172  */
 173
 174 static void triflex_bmdma_stop(struct ata_queued_cmd *qc)
 175 {
 176         ata_bmdma_stop(qc);
 177         triflex_load_timing(qc->ap, qc->dev, qc->dev->pio_mode);
 178 }
 179
 180 static struct scsi_host_template triflex_sht = {
 181         .module                 = THIS_MODULE,
 182         .name                   = DRV_NAME,
 183         .ioctl                  = ata_scsi_ioctl,
 184         .queuecommand           = ata_scsi_queuecmd,
 185         .can_queue              = ATA_DEF_QUEUE,
 186         .this_id                = ATA_SHT_THIS_ID,
 187         .sg_tablesize           = LIBATA_MAX_PRD,
 188         .max_sectors            = ATA_MAX_SECTORS,
 189         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 190         .emulated               = ATA_SHT_EMULATED,
 191         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 192         .proc_name              = DRV_NAME,
 193         .dma_boundary           = ATA_DMA_BOUNDARY,
 194         .slave_configure        = ata_scsi_slave_config,
 195         .bios_param             = ata_std_bios_param,
 196 };
 197
 198 static struct ata_port_operations triflex_port_ops = {
 199         .port_disable   = ata_port_disable,
 200         .set_piomode    = triflex_set_piomode,
 201         .mode_filter    = ata_pci_default_filter,
 202
 203         .tf_load        = ata_tf_load,
 204         .tf_read        = ata_tf_read,
 205         .check_status   = ata_check_status,
 206         .exec_command   = ata_exec_command,
 207         .dev_select     = ata_std_dev_select,
 208
 209         .freeze         = ata_bmdma_freeze,
 210         .thaw           = ata_bmdma_thaw,
 211         .error_handler  = triflex_error_handler,
 212         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 213
 214         .bmdma_setup    = ata_bmdma_setup,
 215         .bmdma_start    = triflex_bmdma_start,
 216         .bmdma_stop     = triflex_bmdma_stop,
 217         .bmdma_status   = ata_bmdma_status,
 218
 219         .qc_prep        = ata_qc_prep,
 220         .qc_issue       = ata_qc_issue_prot,
 221
 222         .data_xfer      = ata_pio_data_xfer,
 223
 224         .irq_handler    = ata_interrupt,
 225         .irq_clear      = ata_bmdma_irq_clear,
 226
 227         .port_start     = ata_port_start,
 228         .port_stop      = ata_port_stop,
 229         .host_stop      = ata_host_stop
 230 };
 231
 232 static int triflex_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 233 {
 234         static struct ata_port_info info = {
 235                 .sht = &triflex_sht,
 236                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 237                 .pio_mask = 0x1f,
 238                 .mwdma_mask = 0x07,
 239                 .port_ops = &triflex_port_ops
 240         };
 241         static struct ata_port_info *port_info[2] = { &info, &info };
 242         static int printed_version;
 243
 244         if (!printed_version++)
 245                 dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
 246
 247         return ata_pci_init_one(dev, port_info, 2);
 248 }
 249
 250 static const struct pci_device_id triflex[] = {
 251         { PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), },
 252
 253         { },
 254 };
 255
 256 static struct pci_driver triflex_pci_driver = {
 257         .name           = DRV_NAME,
 258         .id_table       = triflex,
 259         .probe          = triflex_init_one,
 260         .remove         = ata_pci_remove_one
 261 };
 262
 263 static int __init triflex_init(void)
 264 {
 265         return pci_register_driver(&triflex_pci_driver);
 266 }
 267
 268 static void __exit triflex_exit(void)
 269 {
 270         pci_unregister_driver(&triflex_pci_driver);
 271 }
 272
 273 MODULE_AUTHOR("Alan Cox");
 274 MODULE_DESCRIPTION("low-level driver for Compaq Triflex");
 275 MODULE_LICENSE("GPL");
 276 MODULE_DEVICE_TABLE(pci, triflex);
 277 MODULE_VERSION(DRV_VERSION);
 278
 279 module_init(triflex_init);
 280 module_exit(triflex_exit);