drivers/ata/pata_oldpiix.c

   1 /*
   2  *    pata_oldpiix.c - Intel PATA/SATA controllers
   3  *
   4  *      (C) 2005 Red Hat
   5  *
   6  *    Some parts based on ata_piix.c by Jeff Garzik and others.
   7  *
   8  *    Early PIIX differs significantly from the later PIIX as it lacks
   9  *    SITRE and the slave timing registers. This means that you have to
  10  *    set timing per channel, or be clever. Libata tells us whenever it
  11  *    does drive selection and we use this to reload the timings.
  12  *
  13  *    Because of these behaviour differences PIIX gets its own driver module.
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/pci.h>
  19 #include <linux/init.h>
  20 #include <linux/blkdev.h>
  21 #include <linux/delay.h>
  22 #include <linux/device.h>
  23 #include <scsi/scsi_host.h>
  24 #include <linux/libata.h>
  25 #include <linux/ata.h>
  26
  27 #define DRV_NAME        "pata_oldpiix"
  28 #define DRV_VERSION     "0.5.5"
  29
  30 /**
  31  *      oldpiix_pre_reset               -       probe begin
  32  *      @link: ATA link
  33  *      @deadline: deadline jiffies for the operation
  34  *
  35  *      Set up cable type and use generic probe init
  36  */
  37
  38 static int oldpiix_pre_reset(struct ata_link *link, unsigned long deadline)
  39 {
  40         struct ata_port *ap = link->ap;
  41         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  42         static const struct pci_bits oldpiix_enable_bits[] = {
  43                 { 0x41U, 1U, 0x80UL, 0x80UL },  /* port 0 */
  44                 { 0x43U, 1U, 0x80UL, 0x80UL },  /* port 1 */
  45         };
  46
  47         if (!pci_test_config_bits(pdev, &oldpiix_enable_bits[ap->port_no]))
  48                 return -ENOENT;
  49
  50         return ata_sff_prereset(link, deadline);
  51 }
  52
  53 /**
  54  *      oldpiix_set_piomode - Initialize host controller PATA PIO timings
  55  *      @ap: Port whose timings we are configuring
  56  *      @adev: Device whose timings we are configuring
  57  *
  58  *      Set PIO mode for device, in host controller PCI config space.
  59  *
  60  *      LOCKING:
  61  *      None (inherited from caller).
  62  */
  63
  64 static void oldpiix_set_piomode (struct ata_port *ap, struct ata_device *adev)
  65 {
  66         unsigned int pio        = adev->pio_mode - XFER_PIO_0;
  67         struct pci_dev *dev     = to_pci_dev(ap->host->dev);
  68         unsigned int idetm_port= ap->port_no ? 0x42 : 0x40;
  69         u16 idetm_data;
  70         int control = 0;
  71
  72         /*
  73          *      See Intel Document 298600-004 for the timing programing rules
  74          *      for PIIX/ICH. Note that the early PIIX does not have the slave
  75          *      timing port at 0x44.
  76          */
  77
  78         static const     /* ISP  RTC */
  79         u8 timings[][2] = { { 0, 0 },
  80                             { 0, 0 },
  81                             { 1, 0 },
  82                             { 2, 1 },
  83                             { 2, 3 }, };
  84
  85         if (pio > 1)
  86                 control |= 1;   /* TIME */
  87         if (ata_pio_need_iordy(adev))
  88                 control |= 2;   /* IE */
  89
  90         /* Intel specifies that the prefetch/posting is for disk only */
  91         if (adev->class == ATA_DEV_ATA)
  92                 control |= 4;   /* PPE */
  93
  94         pci_read_config_word(dev, idetm_port, &idetm_data);
  95
  96         /*
  97          * Set PPE, IE and TIME as appropriate.
  98          * Clear the other drive's timing bits.
  99          */
 100         if (adev->devno == 0) {
 101                 idetm_data &= 0xCCE0;
 102                 idetm_data |= control;
 103         } else {
 104                 idetm_data &= 0xCC0E;
 105                 idetm_data |= (control << 4);
 106         }
 107         idetm_data |= (timings[pio][0] << 12) |
 108                         (timings[pio][1] << 8);
 109         pci_write_config_word(dev, idetm_port, idetm_data);
 110
 111         /* Track which port is configured */
 112         ap->private_data = adev;
 113 }
 114
 115 /**
 116  *      oldpiix_set_dmamode - Initialize host controller PATA DMA timings
 117  *      @ap: Port whose timings we are configuring
 118  *      @adev: Device to program
 119  *
 120  *      Set MWDMA mode for device, in host controller PCI config space.
 121  *
 122  *      LOCKING:
 123  *      None (inherited from caller).
 124  */
 125
 126 static void oldpiix_set_dmamode (struct ata_port *ap, struct ata_device *adev)
 127 {
 128         struct pci_dev *dev     = to_pci_dev(ap->host->dev);
 129         u8 idetm_port           = ap->port_no ? 0x42 : 0x40;
 130         u16 idetm_data;
 131
 132         static const     /* ISP  RTC */
 133         u8 timings[][2] = { { 0, 0 },
 134                             { 0, 0 },
 135                             { 1, 0 },
 136                             { 2, 1 },
 137                             { 2, 3 }, };
 138
 139         /*
 140          * MWDMA is driven by the PIO timings. We must also enable
 141          * IORDY unconditionally along with TIME1. PPE has already
 142          * been set when the PIO timing was set.
 143          */
 144
 145         unsigned int mwdma      = adev->dma_mode - XFER_MW_DMA_0;
 146         unsigned int control;
 147         const unsigned int needed_pio[3] = {
 148                 XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
 149         };
 150         int pio = needed_pio[mwdma] - XFER_PIO_0;
 151
 152         pci_read_config_word(dev, idetm_port, &idetm_data);
 153
 154         control = 3;    /* IORDY|TIME0 */
 155         /* Intel specifies that the PPE functionality is for disk only */
 156         if (adev->class == ATA_DEV_ATA)
 157                 control |= 4;   /* PPE enable */
 158
 159         /* If the drive MWDMA is faster than it can do PIO then
 160            we must force PIO into PIO0 */
 161
 162         if (adev->pio_mode < needed_pio[mwdma])
 163                 /* Enable DMA timing only */
 164                 control |= 8;   /* PIO cycles in PIO0 */
 165
 166         /* Mask out the relevant control and timing bits we will load. Also
 167            clear the other drive TIME register as a precaution */
 168         if (adev->devno == 0) {
 169                 idetm_data &= 0xCCE0;
 170                 idetm_data |= control;
 171         } else {
 172                 idetm_data &= 0xCC0E;
 173                 idetm_data |= (control << 4);
 174         }
 175         idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
 176         pci_write_config_word(dev, idetm_port, idetm_data);
 177
 178         /* Track which port is configured */
 179         ap->private_data = adev;
 180 }
 181
 182 /**
 183  *      oldpiix_qc_issue        -       command issue
 184  *      @qc: command pending
 185  *
 186  *      Called when the libata layer is about to issue a command. We wrap
 187  *      this interface so that we can load the correct ATA timings if
 188  *      necessary. Our logic also clears TIME0/TIME1 for the other device so
 189  *      that, even if we get this wrong, cycles to the other device will
 190  *      be made PIO0.
 191  */
 192
 193 static unsigned int oldpiix_qc_issue(struct ata_queued_cmd *qc)
 194 {
 195         struct ata_port *ap = qc->ap;
 196         struct ata_device *adev = qc->dev;
 197
 198         if (adev != ap->private_data) {
 199                 oldpiix_set_piomode(ap, adev);
 200                 if (ata_dma_enabled(adev))
 201                         oldpiix_set_dmamode(ap, adev);
 202         }
 203         return ata_sff_qc_issue(qc);
 204 }
 205
 206
 207 static struct scsi_host_template oldpiix_sht = {
 208         ATA_BMDMA_SHT(DRV_NAME),
 209 };
 210
 211 static struct ata_port_operations oldpiix_pata_ops = {
 212         .inherits               = &ata_bmdma_port_ops,
 213         .qc_issue               = oldpiix_qc_issue,
 214         .cable_detect           = ata_cable_40wire,
 215         .set_piomode            = oldpiix_set_piomode,
 216         .set_dmamode            = oldpiix_set_dmamode,
 217         .prereset               = oldpiix_pre_reset,
 218 };
 219
 220
 221 /**
 222  *      oldpiix_init_one - Register PIIX ATA PCI device with kernel services
 223  *      @pdev: PCI device to register
 224  *      @ent: Entry in oldpiix_pci_tbl matching with @pdev
 225  *
 226  *      Called from kernel PCI layer.  We probe for combined mode (sigh),
 227  *      and then hand over control to libata, for it to do the rest.
 228  *
 229  *      LOCKING:
 230  *      Inherited from PCI layer (may sleep).
 231  *
 232  *      RETURNS:
 233  *      Zero on success, or -ERRNO value.
 234  */
 235
 236 static int oldpiix_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 237 {
 238         static int printed_version;
 239         static const struct ata_port_info info = {
 240                 .flags          = ATA_FLAG_SLAVE_POSS,
 241                 .pio_mask       = ATA_PIO4,
 242                 .mwdma_mask     = ATA_MWDMA12_ONLY,
 243                 .port_ops       = &oldpiix_pata_ops,
 244         };
 245         const struct ata_port_info *ppi[] = { &info, NULL };
 246
 247         if (!printed_version++)
 248                 dev_printk(KERN_DEBUG, &pdev->dev,
 249                            "version " DRV_VERSION "\n");
 250
 251         return ata_pci_sff_init_one(pdev, ppi, &oldpiix_sht, NULL);
 252 }
 253
 254 static const struct pci_device_id oldpiix_pci_tbl[] = {
 255         { PCI_VDEVICE(INTEL, 0x1230), },
 256
 257         { }     /* terminate list */
 258 };
 259
 260 static struct pci_driver oldpiix_pci_driver = {
 261         .name                   = DRV_NAME,
 262         .id_table               = oldpiix_pci_tbl,
 263         .probe                  = oldpiix_init_one,
 264         .remove                 = ata_pci_remove_one,
 265 #ifdef CONFIG_PM
 266         .suspend                = ata_pci_device_suspend,
 267         .resume                 = ata_pci_device_resume,
 268 #endif
 269 };
 270
 271 static int __init oldpiix_init(void)
 272 {
 273         return pci_register_driver(&oldpiix_pci_driver);
 274 }
 275
 276 static void __exit oldpiix_exit(void)
 277 {
 278         pci_unregister_driver(&oldpiix_pci_driver);
 279 }
 280
 281 module_init(oldpiix_init);
 282 module_exit(oldpiix_exit);
 283
 284 MODULE_AUTHOR("Alan Cox");
 285 MODULE_DESCRIPTION("SCSI low-level driver for early PIIX series controllers");
 286 MODULE_LICENSE("GPL");
 287 MODULE_DEVICE_TABLE(pci, oldpiix_pci_tbl);
 288 MODULE_VERSION(DRV_VERSION);
 289