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     "0.2.3"
  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  *      @unused: returned device on set_mode failure
  56  *
  57  *      Use a non standard set_mode function. We don't want to be tuned. We
  58  *      would prefer to be BIOS generic but for the fact our hardware is
  59  *      whacked out.
  60  */
  61
  62 static int rz1000_set_mode(struct ata_port *ap, struct ata_device **unused)
  63 {
  64         int i;
  65
  66         for (i = 0; i < ATA_MAX_DEVICES; i++) {
  67                 struct ata_device *dev = &ap->device[i];
  68                 if (ata_dev_ready(dev)) {
  69                         /* We don't really care */
  70                         dev->pio_mode = XFER_PIO_0;
  71                         dev->xfer_mode = XFER_PIO_0;
  72                         dev->xfer_shift = ATA_SHIFT_PIO;
  73                         dev->flags |= ATA_DFLAG_PIO;
  74                 }
  75         }
  76         return 0;
  77 }
  78
  79
  80 static struct scsi_host_template rz1000_sht = {
  81         .module                 = THIS_MODULE,
  82         .name                   = DRV_NAME,
  83         .ioctl                  = ata_scsi_ioctl,
  84         .queuecommand           = ata_scsi_queuecmd,
  85         .can_queue              = ATA_DEF_QUEUE,
  86         .this_id                = ATA_SHT_THIS_ID,
  87         .sg_tablesize           = LIBATA_MAX_PRD,
  88         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
  89         .emulated               = ATA_SHT_EMULATED,
  90         .use_clustering         = ATA_SHT_USE_CLUSTERING,
  91         .proc_name              = DRV_NAME,
  92         .dma_boundary           = ATA_DMA_BOUNDARY,
  93         .slave_configure        = ata_scsi_slave_config,
  94         .slave_destroy          = ata_scsi_slave_destroy,
  95         .bios_param             = ata_std_bios_param,
  96         .resume                 = ata_scsi_device_resume,
  97         .suspend                = ata_scsi_device_suspend,
  98 };
  99
 100 static struct ata_port_operations rz1000_port_ops = {
 101         .set_mode       = rz1000_set_mode,
 102
 103         .port_disable   = ata_port_disable,
 104         .tf_load        = ata_tf_load,
 105         .tf_read        = ata_tf_read,
 106         .check_status   = ata_check_status,
 107         .exec_command   = ata_exec_command,
 108         .dev_select     = ata_std_dev_select,
 109
 110         .bmdma_setup    = ata_bmdma_setup,
 111         .bmdma_start    = ata_bmdma_start,
 112         .bmdma_stop     = ata_bmdma_stop,
 113         .bmdma_status   = ata_bmdma_status,
 114
 115         .qc_prep        = ata_qc_prep,
 116         .qc_issue       = ata_qc_issue_prot,
 117
 118         .data_xfer      = ata_pio_data_xfer,
 119
 120         .freeze         = ata_bmdma_freeze,
 121         .thaw           = ata_bmdma_thaw,
 122         .error_handler  = rz1000_error_handler,
 123         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 124
 125         .irq_handler    = ata_interrupt,
 126         .irq_clear      = ata_bmdma_irq_clear,
 127
 128         .port_start     = ata_port_start,
 129         .port_stop      = ata_port_stop,
 130         .host_stop      = ata_host_stop
 131 };
 132
 133 static int rz1000_fifo_disable(struct pci_dev *pdev)
 134 {
 135         u16 reg;
 136         /* Be exceptionally paranoid as we must be sure to apply the fix */
 137         if (pci_read_config_word(pdev, 0x40, &reg) != 0)
 138                 return -1;
 139         reg &= 0xDFFF;
 140         if (pci_write_config_word(pdev, 0x40, reg) != 0)
 141                 return -1;
 142         printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
 143         return 0;
 144 }
 145
 146 /**
 147  *      rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
 148  *      @pdev: PCI device to register
 149  *      @ent: Entry in rz1000_pci_tbl matching with @pdev
 150  *
 151  *      Configure an RZ1000 interface. This doesn't require much special
 152  *      handling except that we *MUST* kill the chipset readahead or the
 153  *      user may experience data corruption.
 154  */
 155
 156 static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 157 {
 158         static int printed_version;
 159         struct ata_port_info *port_info[2];
 160         static struct ata_port_info info = {
 161                 .sht = &rz1000_sht,
 162                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 163                 .pio_mask = 0x1f,
 164                 .port_ops = &rz1000_port_ops
 165         };
 166
 167         if (!printed_version++)
 168                 printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
 169
 170         if (rz1000_fifo_disable(pdev) == 0) {
 171                 port_info[0] = &info;
 172                 port_info[1] = &info;
 173                 return ata_pci_init_one(pdev, port_info, 2);
 174         }
 175         printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n");
 176         /* Not safe to use so skip */
 177         return -ENODEV;
 178 }
 179
 180 static int rz1000_reinit_one(struct pci_dev *pdev)
 181 {
 182         /* If this fails on resume (which is a "cant happen" case), we
 183            must stop as any progress risks data loss */
 184         if (rz1000_fifo_disable(pdev))
 185                 panic("rz1000 fifo");
 186         return ata_pci_device_resume(pdev);
 187 }
 188
 189 static const struct pci_device_id pata_rz1000[] = {
 190         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
 191         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },
 192
 193         { },
 194 };
 195
 196 static struct pci_driver rz1000_pci_driver = {
 197         .name           = DRV_NAME,
 198         .id_table       = pata_rz1000,
 199         .probe          = rz1000_init_one,
 200         .remove         = ata_pci_remove_one,
 201         .suspend        = ata_pci_device_suspend,
 202         .resume         = rz1000_reinit_one,
 203 };
 204
 205 static int __init rz1000_init(void)
 206 {
 207         return pci_register_driver(&rz1000_pci_driver);
 208 }
 209
 210 static void __exit rz1000_exit(void)
 211 {
 212         pci_unregister_driver(&rz1000_pci_driver);
 213 }
 214
 215 MODULE_AUTHOR("Alan Cox");
 216 MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
 217 MODULE_LICENSE("GPL");
 218 MODULE_DEVICE_TABLE(pci, pata_rz1000);
 219 MODULE_VERSION(DRV_VERSION);
 220
 221 module_init(rz1000_init);
 222 module_exit(rz1000_exit);
 223