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_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_ready(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 #ifdef CONFIG_PM
  73         .resume                 = ata_scsi_device_resume,
  74         .suspend                = ata_scsi_device_suspend,
  75 #endif
  76 };
  77
  78 static struct ata_port_operations rz1000_port_ops = {
  79         .set_mode       = rz1000_set_mode,
  80
  81         .port_disable   = ata_port_disable,
  82         .tf_load        = ata_tf_load,
  83         .tf_read        = ata_tf_read,
  84         .check_status   = ata_check_status,
  85         .exec_command   = ata_exec_command,
  86         .dev_select     = ata_std_dev_select,
  87
  88         .bmdma_setup    = ata_bmdma_setup,
  89         .bmdma_start    = ata_bmdma_start,
  90         .bmdma_stop     = ata_bmdma_stop,
  91         .bmdma_status   = ata_bmdma_status,
  92
  93         .qc_prep        = ata_qc_prep,
  94         .qc_issue       = ata_qc_issue_prot,
  95
  96         .data_xfer      = ata_data_xfer,
  97
  98         .freeze         = ata_bmdma_freeze,
  99         .thaw           = ata_bmdma_thaw,
 100         .error_handler  = ata_bmdma_error_handler,
 101         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 102         .cable_detect   = ata_cable_40wire,
 103
 104         .irq_handler    = ata_interrupt,
 105         .irq_clear      = ata_bmdma_irq_clear,
 106         .irq_on         = ata_irq_on,
 107         .irq_ack        = ata_irq_ack,
 108
 109         .port_start     = ata_port_start,
 110 };
 111
 112 static int rz1000_fifo_disable(struct pci_dev *pdev)
 113 {
 114         u16 reg;
 115         /* Be exceptionally paranoid as we must be sure to apply the fix */
 116         if (pci_read_config_word(pdev, 0x40, &reg) != 0)
 117                 return -1;
 118         reg &= 0xDFFF;
 119         if (pci_write_config_word(pdev, 0x40, reg) != 0)
 120                 return -1;
 121         printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
 122         return 0;
 123 }
 124
 125 /**
 126  *      rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
 127  *      @pdev: PCI device to register
 128  *      @ent: Entry in rz1000_pci_tbl matching with @pdev
 129  *
 130  *      Configure an RZ1000 interface. This doesn't require much special
 131  *      handling except that we *MUST* kill the chipset readahead or the
 132  *      user may experience data corruption.
 133  */
 134
 135 static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 136 {
 137         static int printed_version;
 138         struct ata_port_info *port_info[2];
 139         static struct ata_port_info info = {
 140                 .sht = &rz1000_sht,
 141                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 142                 .pio_mask = 0x1f,
 143                 .port_ops = &rz1000_port_ops
 144         };
 145
 146         if (!printed_version++)
 147                 printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
 148
 149         if (rz1000_fifo_disable(pdev) == 0) {
 150                 port_info[0] = &info;
 151                 port_info[1] = &info;
 152                 return ata_pci_init_one(pdev, port_info, 2);
 153         }
 154         printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n");
 155         /* Not safe to use so skip */
 156         return -ENODEV;
 157 }
 158
 159 #ifdef CONFIG_PM
 160 static int rz1000_reinit_one(struct pci_dev *pdev)
 161 {
 162         /* If this fails on resume (which is a "cant happen" case), we
 163            must stop as any progress risks data loss */
 164         if (rz1000_fifo_disable(pdev))
 165                 panic("rz1000 fifo");
 166         return ata_pci_device_resume(pdev);
 167 }
 168 #endif
 169
 170 static const struct pci_device_id pata_rz1000[] = {
 171         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
 172         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },
 173
 174         { },
 175 };
 176
 177 static struct pci_driver rz1000_pci_driver = {
 178         .name           = DRV_NAME,
 179         .id_table       = pata_rz1000,
 180         .probe          = rz1000_init_one,
 181         .remove         = ata_pci_remove_one,
 182 #ifdef CONFIG_PM
 183         .suspend        = ata_pci_device_suspend,
 184         .resume         = rz1000_reinit_one,
 185 #endif
 186 };
 187
 188 static int __init rz1000_init(void)
 189 {
 190         return pci_register_driver(&rz1000_pci_driver);
 191 }
 192
 193 static void __exit rz1000_exit(void)
 194 {
 195         pci_unregister_driver(&rz1000_pci_driver);
 196 }
 197
 198 MODULE_AUTHOR("Alan Cox");
 199 MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
 200 MODULE_LICENSE("GPL");
 201 MODULE_DEVICE_TABLE(pci, pata_rz1000);
 202 MODULE_VERSION(DRV_VERSION);
 203
 204 module_init(rz1000_init);
 205 module_exit(rz1000_exit);
 206