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     "0.2.4"
  25
  26
  27 /**
  28  *      rz1000_set_mode         -       mode setting function
  29  *      @link: ATA link
  30  *      @unused: returned device on set_mode failure
  31  *
  32  *      Use a non standard set_mode function. We don't want to be tuned. We
  33  *      would prefer to be BIOS generic but for the fact our hardware is
  34  *      whacked out.
  35  */
  36
  37 static int rz1000_set_mode(struct ata_link *link, struct ata_device **unused)
  38 {
  39         struct ata_device *dev;
  40
  41         ata_link_for_each_dev(dev, link) {
  42                 if (ata_dev_enabled(dev)) {
  43                         /* We don't really care */
  44                         dev->pio_mode = XFER_PIO_0;
  45                         dev->xfer_mode = XFER_PIO_0;
  46                         dev->xfer_shift = ATA_SHIFT_PIO;
  47                         dev->flags |= ATA_DFLAG_PIO;
  48                         ata_dev_printk(dev, KERN_INFO, "configured for PIO\n");
  49                 }
  50         }
  51         return 0;
  52 }
  53
  54
  55 static struct scsi_host_template rz1000_sht = {
  56         .module                 = THIS_MODULE,
  57         .name                   = DRV_NAME,
  58         .ioctl                  = ata_scsi_ioctl,
  59         .queuecommand           = ata_scsi_queuecmd,
  60         .can_queue              = ATA_DEF_QUEUE,
  61         .this_id                = ATA_SHT_THIS_ID,
  62         .sg_tablesize           = LIBATA_MAX_PRD,
  63         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
  64         .emulated               = ATA_SHT_EMULATED,
  65         .use_clustering         = ATA_SHT_USE_CLUSTERING,
  66         .proc_name              = DRV_NAME,
  67         .dma_boundary           = ATA_DMA_BOUNDARY,
  68         .slave_configure        = ata_scsi_slave_config,
  69         .slave_destroy          = ata_scsi_slave_destroy,
  70         .bios_param             = ata_std_bios_param,
  71 };
  72
  73 static struct ata_port_operations rz1000_port_ops = {
  74         .set_mode       = rz1000_set_mode,
  75
  76         .tf_load        = ata_tf_load,
  77         .tf_read        = ata_tf_read,
  78         .check_status   = ata_check_status,
  79         .exec_command   = ata_exec_command,
  80         .dev_select     = ata_std_dev_select,
  81
  82         .qc_prep        = ata_qc_prep,
  83         .qc_issue       = ata_qc_issue_prot,
  84
  85         .data_xfer      = ata_data_xfer,
  86
  87         .freeze         = ata_bmdma_freeze,
  88         .thaw           = ata_bmdma_thaw,
  89         .error_handler  = ata_bmdma_error_handler,
  90         .post_internal_cmd = ata_bmdma_post_internal_cmd,
  91         .cable_detect   = ata_cable_40wire,
  92
  93         .irq_handler    = ata_interrupt,
  94         .irq_clear      = ata_noop_irq_clear,
  95         .irq_on         = ata_irq_on,
  96
  97         .port_start     = ata_sff_port_start,
  98 };
  99
 100 static int rz1000_fifo_disable(struct pci_dev *pdev)
 101 {
 102         u16 reg;
 103         /* Be exceptionally paranoid as we must be sure to apply the fix */
 104         if (pci_read_config_word(pdev, 0x40, &reg) != 0)
 105                 return -1;
 106         reg &= 0xDFFF;
 107         if (pci_write_config_word(pdev, 0x40, reg) != 0)
 108                 return -1;
 109         printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
 110         return 0;
 111 }
 112
 113 /**
 114  *      rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
 115  *      @pdev: PCI device to register
 116  *      @ent: Entry in rz1000_pci_tbl matching with @pdev
 117  *
 118  *      Configure an RZ1000 interface. This doesn't require much special
 119  *      handling except that we *MUST* kill the chipset readahead or the
 120  *      user may experience data corruption.
 121  */
 122
 123 static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 124 {
 125         static int printed_version;
 126         static const struct ata_port_info info = {
 127                 .sht = &rz1000_sht,
 128                 .flags = ATA_FLAG_SLAVE_POSS,
 129                 .pio_mask = 0x1f,
 130                 .port_ops = &rz1000_port_ops
 131         };
 132         const struct ata_port_info *ppi[] = { &info, NULL };
 133
 134         if (!printed_version++)
 135                 printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
 136
 137         if (rz1000_fifo_disable(pdev) == 0)
 138                 return ata_pci_init_one(pdev, ppi);
 139
 140         printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n");
 141         /* Not safe to use so skip */
 142         return -ENODEV;
 143 }
 144
 145 #ifdef CONFIG_PM
 146 static int rz1000_reinit_one(struct pci_dev *pdev)
 147 {
 148         /* If this fails on resume (which is a "cant happen" case), we
 149            must stop as any progress risks data loss */
 150         if (rz1000_fifo_disable(pdev))
 151                 panic("rz1000 fifo");
 152         return ata_pci_device_resume(pdev);
 153 }
 154 #endif
 155
 156 static const struct pci_device_id pata_rz1000[] = {
 157         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
 158         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },
 159
 160         { },
 161 };
 162
 163 static struct pci_driver rz1000_pci_driver = {
 164         .name           = DRV_NAME,
 165         .id_table       = pata_rz1000,
 166         .probe          = rz1000_init_one,
 167         .remove         = ata_pci_remove_one,
 168 #ifdef CONFIG_PM
 169         .suspend        = ata_pci_device_suspend,
 170         .resume         = rz1000_reinit_one,
 171 #endif
 172 };
 173
 174 static int __init rz1000_init(void)
 175 {
 176         return pci_register_driver(&rz1000_pci_driver);
 177 }
 178
 179 static void __exit rz1000_exit(void)
 180 {
 181         pci_unregister_driver(&rz1000_pci_driver);
 182 }
 183
 184 MODULE_AUTHOR("Alan Cox");
 185 MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
 186 MODULE_LICENSE("GPL");
 187 MODULE_DEVICE_TABLE(pci, pata_rz1000);
 188 MODULE_VERSION(DRV_VERSION);
 189
 190 module_init(rz1000_init);
 191 module_exit(rz1000_exit);
 192