drivers/ata/pata_rz1000.c

   1 /*
   2  *  RZ1000/1001 driver based upon
   3  *
   4  *  linux/drivers/ide/pci/rz1000.c      Version 0.06    January 12, 2003
   5  *  Copyright (C) 1995-1998  Linus Torvalds & author (see below)
   6  *  Principal Author:  mlord@pobox.com (Mark Lord)
   7  *
   8  *  See linux/MAINTAINERS for address of current maintainer.
   9  *
  10  *  This file provides support for disabling the buggy read-ahead
  11  *  mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/pci.h>
  17 #include <linux/init.h>
  18 #include <linux/blkdev.h>
  19 #include <linux/delay.h>
  20 #include <scsi/scsi_host.h>
  21 #include <linux/libata.h>
  22
  23 #define DRV_NAME        "pata_rz1000"
  24 #define DRV_VERSION     "0.2.2"
  25
  26
  27 /**
  28  *      rz1000_prereset         -       probe begin
  29  *      @ap: ATA port
  30  *
  31  *      Set up cable type and use generics
  32  */
  33
  34 static int rz1000_prereset(struct ata_port *ap)
  35 {
  36         ap->cbl = ATA_CBL_PATA40;
  37         return ata_std_prereset(ap);
  38 }
  39
  40 /**
  41  *      rz1000_error_handler            -       probe reset
  42  *      @ap: ATA port
  43  *
  44  *      Perform the ATA standard reset sequence
  45  */
  46
  47 static void rz1000_error_handler(struct ata_port *ap)
  48 {
  49         ata_bmdma_drive_eh(ap, rz1000_prereset, ata_std_softreset, NULL, ata_std_postreset);
  50 }
  51
  52 /**
  53  *      rz1000_set_mode         -       mode setting function
  54  *      @ap: ATA interface
  55  *
  56  *      Use a non standard set_mode function. We don't want to be tuned. We
  57  *      would prefer to be BIOS generic but for the fact our hardware is
  58  *      whacked out.
  59  */
  60
  61 static void rz1000_set_mode(struct ata_port *ap)
  62 {
  63         int i;
  64
  65         for (i = 0; i < ATA_MAX_DEVICES; i++) {
  66                 struct ata_device *dev = &ap->device[i];
  67                 if (ata_dev_enabled(dev)) {
  68                         /* We don't really care */
  69                         dev->pio_mode = XFER_PIO_0;
  70                         dev->xfer_mode = XFER_PIO_0;
  71                         dev->xfer_shift = ATA_SHIFT_PIO;
  72                         dev->flags |= ATA_DFLAG_PIO;
  73                 }
  74         }
  75 }
  76
  77
  78 static struct scsi_host_template rz1000_sht = {
  79         .module                 = THIS_MODULE,
  80         .name                   = DRV_NAME,
  81         .ioctl                  = ata_scsi_ioctl,
  82         .queuecommand           = ata_scsi_queuecmd,
  83         .can_queue              = ATA_DEF_QUEUE,
  84         .this_id                = ATA_SHT_THIS_ID,
  85         .sg_tablesize           = LIBATA_MAX_PRD,
  86         .max_sectors            = ATA_MAX_SECTORS,
  87         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
  88         .emulated               = ATA_SHT_EMULATED,
  89         .use_clustering         = ATA_SHT_USE_CLUSTERING,
  90         .proc_name              = DRV_NAME,
  91         .dma_boundary           = ATA_DMA_BOUNDARY,
  92         .slave_configure        = ata_scsi_slave_config,
  93         .bios_param             = ata_std_bios_param,
  94 };
  95
  96 static struct ata_port_operations rz1000_port_ops = {
  97         .set_mode       = rz1000_set_mode,
  98
  99         .port_disable   = ata_port_disable,
 100         .tf_load        = ata_tf_load,
 101         .tf_read        = ata_tf_read,
 102         .check_status   = ata_check_status,
 103         .exec_command   = ata_exec_command,
 104         .dev_select     = ata_std_dev_select,
 105
 106         .error_handler  = rz1000_error_handler,
 107
 108         .bmdma_setup    = ata_bmdma_setup,
 109         .bmdma_start    = ata_bmdma_start,
 110         .bmdma_stop     = ata_bmdma_stop,
 111         .bmdma_status   = ata_bmdma_status,
 112
 113         .qc_prep        = ata_qc_prep,
 114         .qc_issue       = ata_qc_issue_prot,
 115
 116         .data_xfer      = ata_pio_data_xfer,
 117
 118         .freeze         = ata_bmdma_freeze,
 119         .thaw           = ata_bmdma_thaw,
 120         .error_handler  = rz1000_error_handler,
 121         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 122
 123         .irq_handler    = ata_interrupt,
 124         .irq_clear      = ata_bmdma_irq_clear,
 125
 126         .port_start     = ata_port_start,
 127         .port_stop      = ata_port_stop,
 128         .host_stop      = ata_host_stop
 129 };
 130
 131 /**
 132  *      rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
 133  *      @pdev: PCI device to register
 134  *      @ent: Entry in rz1000_pci_tbl matching with @pdev
 135  *
 136  *      Configure an RZ1000 interface. This doesn't require much special
 137  *      handling except that we *MUST* kill the chipset readahead or the
 138  *      user may experience data corruption.
 139  */
 140
 141 static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 142 {
 143         static int printed_version;
 144         struct ata_port_info *port_info[2];
 145         u16 reg;
 146         static struct ata_port_info info = {
 147                 .sht = &rz1000_sht,
 148                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 149                 .pio_mask = 0x1f,
 150                 .port_ops = &rz1000_port_ops
 151         };
 152
 153         if (!printed_version++)
 154                 printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
 155
 156         /* Be exceptionally paranoid as we must be sure to apply the fix */
 157         if (pci_read_config_word(pdev, 0x40, &reg) != 0)
 158                 goto fail;
 159         reg &= 0xDFFF;
 160         if (pci_write_config_word(pdev, 0x40, reg) != 0)
 161                 goto fail;
 162         printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
 163
 164         port_info[0] = &info;
 165         port_info[1] = &info;
 166         return ata_pci_init_one(pdev, port_info, 2);
 167 fail:
 168         printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n");
 169         /* Not safe to use so skip */
 170         return -ENODEV;
 171 }
 172
 173 static const struct pci_device_id pata_rz1000[] = {
 174         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
 175         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },
 176
 177         { },
 178 };
 179
 180 static struct pci_driver rz1000_pci_driver = {
 181         .name           = DRV_NAME,
 182         .id_table       = pata_rz1000,
 183         .probe          = rz1000_init_one,
 184         .remove         = ata_pci_remove_one
 185 };
 186
 187 static int __init rz1000_init(void)
 188 {
 189         return pci_register_driver(&rz1000_pci_driver);
 190 }
 191
 192 static void __exit rz1000_exit(void)
 193 {
 194         pci_unregister_driver(&rz1000_pci_driver);
 195 }
 196
 197 MODULE_AUTHOR("Alan Cox");
 198 MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
 199 MODULE_LICENSE("GPL");
 200 MODULE_DEVICE_TABLE(pci, pata_rz1000);
 201 MODULE_VERSION(DRV_VERSION);
 202
 203 module_init(rz1000_init);
 204 module_exit(rz1000_exit);
 205