release/src-rt-6.x/linux/linux-2.6/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  *      @ap: ATA interface
  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_port *ap, struct ata_device **unused)
  38 {
  39         int i;
  40
  41         for (i = 0; i < ATA_MAX_DEVICES; i++) {
  42                 struct ata_device *dev = &ap->device[i];
  43                 if (ata_dev_enabled(dev)) {
  44                         /* We don't really care */
  45                         dev->pio_mode = XFER_PIO_0;
  46                         dev->xfer_mode = XFER_PIO_0;
  47                         dev->xfer_shift = ATA_SHIFT_PIO;
  48                         dev->flags |= ATA_DFLAG_PIO;
  49                         ata_dev_printk(dev, KERN_INFO, "configured for PIO\n");
  50                 }
  51         }
  52         return 0;
  53 }
  54
  55
  56 static struct scsi_host_template rz1000_sht = {
  57         .module                 = THIS_MODULE,
  58         .name                   = DRV_NAME,
  59         .ioctl                  = ata_scsi_ioctl,
  60         .queuecommand           = ata_scsi_queuecmd,
  61         .can_queue              = ATA_DEF_QUEUE,
  62         .this_id                = ATA_SHT_THIS_ID,
  63         .sg_tablesize           = LIBATA_MAX_PRD,
  64         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
  65         .emulated               = ATA_SHT_EMULATED,
  66         .use_clustering         = ATA_SHT_USE_CLUSTERING,
  67         .proc_name              = DRV_NAME,
  68         .dma_boundary           = ATA_DMA_BOUNDARY,
  69         .slave_configure        = ata_scsi_slave_config,
  70         .slave_destroy          = ata_scsi_slave_destroy,
  71         .bios_param             = ata_std_bios_param,
  72 };
  73
  74 static struct ata_port_operations rz1000_port_ops = {
  75         .set_mode       = rz1000_set_mode,
  76
  77         .port_disable   = ata_port_disable,
  78         .tf_load        = ata_tf_load,
  79         .tf_read        = ata_tf_read,
  80         .check_status   = ata_check_status,
  81         .exec_command   = ata_exec_command,
  82         .dev_select     = ata_std_dev_select,
  83
  84         .bmdma_setup    = ata_bmdma_setup,
  85         .bmdma_start    = ata_bmdma_start,
  86         .bmdma_stop     = ata_bmdma_stop,
  87         .bmdma_status   = ata_bmdma_status,
  88
  89         .qc_prep        = ata_qc_prep,
  90         .qc_issue       = ata_qc_issue_prot,
  91
  92         .data_xfer      = ata_data_xfer,
  93
  94         .freeze         = ata_bmdma_freeze,
  95         .thaw           = ata_bmdma_thaw,
  96         .error_handler  = ata_bmdma_error_handler,
  97         .post_internal_cmd = ata_bmdma_post_internal_cmd,
  98         .cable_detect   = ata_cable_40wire,
  99
 100         .irq_handler    = ata_interrupt,
 101         .irq_clear      = ata_bmdma_irq_clear,
 102         .irq_on         = ata_irq_on,
 103         .irq_ack        = ata_irq_ack,
 104
 105         .port_start     = ata_port_start,
 106 };
 107
 108 static int rz1000_fifo_disable(struct pci_dev *pdev)
 109 {
 110         u16 reg;
 111         /* Be exceptionally paranoid as we must be sure to apply the fix */
 112         if (pci_read_config_word(pdev, 0x40, &reg) != 0)
 113                 return -1;
 114         reg &= 0xDFFF;
 115         if (pci_write_config_word(pdev, 0x40, reg) != 0)
 116                 return -1;
 117         printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
 118         return 0;
 119 }
 120
 121 /**
 122  *      rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
 123  *      @pdev: PCI device to register
 124  *      @ent: Entry in rz1000_pci_tbl matching with @pdev
 125  *
 126  *      Configure an RZ1000 interface. This doesn't require much special
 127  *      handling except that we *MUST* kill the chipset readahead or the
 128  *      user may experience data corruption.
 129  */
 130
 131 static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 132 {
 133         static int printed_version;
 134         static const struct ata_port_info info = {
 135                 .sht = &rz1000_sht,
 136                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 137                 .pio_mask = 0x1f,
 138                 .port_ops = &rz1000_port_ops
 139         };
 140         const struct ata_port_info *ppi[] = { &info, NULL };
 141
 142         if (!printed_version++)
 143                 printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
 144
 145         if (rz1000_fifo_disable(pdev) == 0)
 146                 return ata_pci_init_one(pdev, ppi);
 147
 148         printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n");
 149         /* Not safe to use so skip */
 150         return -ENODEV;
 151 }
 152
 153 #ifdef CONFIG_PM
 154 static int rz1000_reinit_one(struct pci_dev *pdev)
 155 {
 156         /* If this fails on resume (which is a "cant happen" case), we
 157            must stop as any progress risks data loss */
 158         if (rz1000_fifo_disable(pdev))
 159                 panic("rz1000 fifo");
 160         return ata_pci_device_resume(pdev);
 161 }
 162 #endif
 163
 164 static const struct pci_device_id pata_rz1000[] = {
 165         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
 166         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },
 167
 168         { },
 169 };
 170
 171 static struct pci_driver rz1000_pci_driver = {
 172         .name           = DRV_NAME,
 173         .id_table       = pata_rz1000,
 174         .probe          = rz1000_init_one,
 175         .remove         = ata_pci_remove_one,
 176 #ifdef CONFIG_PM
 177         .suspend        = ata_pci_device_suspend,
 178         .resume         = rz1000_reinit_one,
 179 #endif
 180 };
 181
 182 static int __init rz1000_init(void)
 183 {
 184         return pci_register_driver(&rz1000_pci_driver);
 185 }
 186
 187 static void __exit rz1000_exit(void)
 188 {
 189         pci_unregister_driver(&rz1000_pci_driver);
 190 }
 191
 192 MODULE_AUTHOR("Alan Cox");
 193 MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
 194 MODULE_LICENSE("GPL");
 195 MODULE_DEVICE_TABLE(pci, pata_rz1000);
 196 MODULE_VERSION(DRV_VERSION);
 197
 198 module_init(rz1000_init);
 199 module_exit(rz1000_exit);
 200