drivers/ata/ata_generic.c

   1 /*
   2  *  ata_generic.c - Generic PATA/SATA controller driver.
   3  *  Copyright 2005 Red Hat Inc <alan@redhat.com>, all rights reserved.
   4  *
   5  *  Elements from ide/pci/generic.c
   6  *          Copyright (C) 2001-2002     Andre Hedrick <andre@linux-ide.org>
   7  *          Portions (C) Copyright 2002  Red Hat Inc <alan@redhat.com>
   8  *
   9  *  May be copied or modified under the terms of the GNU General Public License
  10  *
  11  *  Driver for PCI IDE interfaces implementing the standard bus mastering
  12  *  interface functionality. This assumes the BIOS did the drive set up and
  13  *  tuning for us. By default we do not grab all IDE class devices as they
  14  *  may have other drivers or need fixups to avoid problems. Instead we keep
  15  *  a default list of stuff without documentation/driver that appears to
  16  *  work.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/pci.h>
  22 #include <linux/init.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/delay.h>
  25 #include <scsi/scsi_host.h>
  26 #include <linux/libata.h>
  27
  28 #define DRV_NAME "ata_generic"
  29 #define DRV_VERSION "0.2.6"
  30
  31 /*
  32  *      A generic parallel ATA driver using libata
  33  */
  34
  35 /**
  36  *      generic_pre_reset               -       probe begin
  37  *      @ap: ATA port
  38  *
  39  *      Set up cable type and use generic probe init
  40  */
  41
  42 static int generic_pre_reset(struct ata_port *ap)
  43 {
  44         ap->cbl = ATA_CBL_PATA80;
  45         return ata_std_prereset(ap);
  46 }
  47
  48
  49 /**
  50  *      generic_error_handler - Probe specified port on PATA host controller
  51  *      @ap: Port to probe
  52  *      @classes:
  53  *
  54  *      LOCKING:
  55  *      None (inherited from caller).
  56  */
  57
  58
  59 static void generic_error_handler(struct ata_port *ap)
  60 {
  61         ata_bmdma_drive_eh(ap, generic_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
  62 }
  63
  64 /**
  65  *      generic_set_mode        -       mode setting
  66  *      @ap: interface to set up
  67  *
  68  *      Use a non standard set_mode function. We don't want to be tuned.
  69  *      The BIOS configured everything. Our job is not to fiddle. We
  70  *      read the dma enabled bits from the PCI configuration of the device
  71  *      and respect them.
  72  */
  73
  74 static void generic_set_mode(struct ata_port *ap)
  75 {
  76         int dma_enabled = 0;
  77         int i;
  78
  79         /* Bits 5 and 6 indicate if DMA is active on master/slave */
  80         if (ap->ioaddr.bmdma_addr)
  81                 dma_enabled = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
  82
  83         for (i = 0; i < ATA_MAX_DEVICES; i++) {
  84                 struct ata_device *dev = &ap->device[i];
  85                 if (ata_dev_enabled(dev)) {
  86                         /* We don't really care */
  87                         dev->pio_mode = XFER_PIO_0;
  88                         dev->dma_mode = XFER_MW_DMA_0;
  89                         /* We do need the right mode information for DMA or PIO
  90                            and this comes from the current configuration flags */
  91                         if (dma_enabled & (1 << (5 + i))) {
  92                                 dev->xfer_mode = XFER_MW_DMA_0;
  93                                 dev->xfer_shift = ATA_SHIFT_MWDMA;
  94                                 dev->flags &= ~ATA_DFLAG_PIO;
  95                         } else {
  96                                 dev->xfer_mode = XFER_PIO_0;
  97                                 dev->xfer_shift = ATA_SHIFT_PIO;
  98                                 dev->flags |= ATA_DFLAG_PIO;
  99                         }
 100                 }
 101         }
 102 }
 103
 104 static struct scsi_host_template generic_sht = {
 105         .module                 = THIS_MODULE,
 106         .name                   = DRV_NAME,
 107         .ioctl                  = ata_scsi_ioctl,
 108         .queuecommand           = ata_scsi_queuecmd,
 109         .can_queue              = ATA_DEF_QUEUE,
 110         .this_id                = ATA_SHT_THIS_ID,
 111         .sg_tablesize           = LIBATA_MAX_PRD,
 112         .max_sectors            = ATA_MAX_SECTORS,
 113         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 114         .emulated               = ATA_SHT_EMULATED,
 115         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 116         .proc_name              = DRV_NAME,
 117         .dma_boundary           = ATA_DMA_BOUNDARY,
 118         .slave_configure        = ata_scsi_slave_config,
 119         .bios_param             = ata_std_bios_param,
 120 };
 121
 122 static struct ata_port_operations generic_port_ops = {
 123         .set_mode       = generic_set_mode,
 124
 125         .port_disable   = ata_port_disable,
 126         .tf_load        = ata_tf_load,
 127         .tf_read        = ata_tf_read,
 128         .check_status   = ata_check_status,
 129         .exec_command   = ata_exec_command,
 130         .dev_select     = ata_std_dev_select,
 131
 132         .bmdma_setup    = ata_bmdma_setup,
 133         .bmdma_start    = ata_bmdma_start,
 134         .bmdma_stop     = ata_bmdma_stop,
 135         .bmdma_status   = ata_bmdma_status,
 136
 137         .data_xfer      = ata_pio_data_xfer,
 138
 139         .freeze         = ata_bmdma_freeze,
 140         .thaw           = ata_bmdma_thaw,
 141         .error_handler  = generic_error_handler,
 142         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 143
 144         .qc_prep        = ata_qc_prep,
 145         .qc_issue       = ata_qc_issue_prot,
 146
 147         .irq_handler    = ata_interrupt,
 148         .irq_clear      = ata_bmdma_irq_clear,
 149
 150         .port_start     = ata_port_start,
 151         .port_stop      = ata_port_stop,
 152         .host_stop      = ata_host_stop
 153 };
 154
 155 static int all_generic_ide;             /* Set to claim all devices */
 156
 157 /**
 158  *      ata_generic_init                -       attach generic IDE
 159  *      @dev: PCI device found
 160  *      @id: match entry
 161  *
 162  *      Called each time a matching IDE interface is found. We check if the
 163  *      interface is one we wish to claim and if so we perform any chip
 164  *      specific hacks then let the ATA layer do the heavy lifting.
 165  */
 166
 167 static int ata_generic_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 168 {
 169         u16 command;
 170         static struct ata_port_info info = {
 171                 .sht = &generic_sht,
 172                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 173                 .pio_mask = 0x1f,
 174                 .mwdma_mask = 0x07,
 175                 .udma_mask = 0x3f,
 176                 .port_ops = &generic_port_ops
 177         };
 178         static struct ata_port_info *port_info[2] = { &info, &info };
 179
 180         /* Don't use the generic entry unless instructed to do so */
 181         if (id->driver_data == 1 && all_generic_ide == 0)
 182                 return -ENODEV;
 183
 184         /* Devices that need care */
 185         if (dev->vendor == PCI_VENDOR_ID_UMC &&
 186             dev->device == PCI_DEVICE_ID_UMC_UM8886A &&
 187             (!(PCI_FUNC(dev->devfn) & 1)))
 188                 return -ENODEV;
 189
 190         if (dev->vendor == PCI_VENDOR_ID_OPTI &&
 191             dev->device == PCI_DEVICE_ID_OPTI_82C558 &&
 192             (!(PCI_FUNC(dev->devfn) & 1)))
 193                 return -ENODEV;
 194
 195         /* Don't re-enable devices in generic mode or we will break some
 196            motherboards with disabled and unused IDE controllers */
 197         pci_read_config_word(dev, PCI_COMMAND, &command);
 198         if (!(command & PCI_COMMAND_IO))
 199                 return -ENODEV;
 200
 201         if (dev->vendor == PCI_VENDOR_ID_AL)
 202                 ata_pci_clear_simplex(dev);
 203
 204         return ata_pci_init_one(dev, port_info, 2);
 205 }
 206
 207 static struct pci_device_id ata_generic[] = {
 208         { PCI_DEVICE(PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_SAMURAI_IDE), },
 209         { PCI_DEVICE(PCI_VENDOR_ID_HOLTEK, PCI_DEVICE_ID_HOLTEK_6565), },
 210         { PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8673F), },
 211         { PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8886A), },
 212         { PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8886BF), },
 213         { PCI_DEVICE(PCI_VENDOR_ID_HINT,   PCI_DEVICE_ID_HINT_VXPROII_IDE), },
 214         { PCI_DEVICE(PCI_VENDOR_ID_VIA,    PCI_DEVICE_ID_VIA_82C561), },
 215         { PCI_DEVICE(PCI_VENDOR_ID_OPTI,   PCI_DEVICE_ID_OPTI_82C558), },
 216         { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO), },
 217         { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_1), },
 218         { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_2),  },
 219         /* Must come last. If you add entries adjust this table appropriately */
 220         { PCI_ANY_ID,           PCI_ANY_ID,                        PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
 221         { 0, },
 222 };
 223
 224 static struct pci_driver ata_generic_pci_driver = {
 225         .name           = DRV_NAME,
 226         .id_table       = ata_generic,
 227         .probe          = ata_generic_init_one,
 228         .remove         = ata_pci_remove_one
 229 };
 230
 231 static int __init ata_generic_init(void)
 232 {
 233         return pci_module_init(&ata_generic_pci_driver);
 234 }
 235
 236
 237 static void __exit ata_generic_exit(void)
 238 {
 239         pci_unregister_driver(&ata_generic_pci_driver);
 240 }
 241
 242
 243 MODULE_AUTHOR("Alan Cox");
 244 MODULE_DESCRIPTION("low-level driver for generic ATA");
 245 MODULE_LICENSE("GPL");
 246 MODULE_DEVICE_TABLE(pci, ata_generic);
 247 MODULE_VERSION(DRV_VERSION);
 248
 249 module_init(ata_generic_init);
 250 module_exit(ata_generic_exit);
 251
 252 module_param(all_generic_ide, int, 0);