drivers/ata/pata_rz1000.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  RZ1000/1001 driver based upon
   4  *
   5  *  linux/drivers/ide/pci/rz1000.c      Version 0.06    January 12, 2003
   6  *  Copyright (C) 1995-1998  Linus Torvalds & author (see below)
   7  *  Principal Author:  mlord@pobox.com (Mark Lord)
   8  *
   9  *  See linux/MAINTAINERS for address of current maintainer.
  10  *
  11  *  This file provides support for disabling the buggy read-ahead
  12  *  mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/pci.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_for_each_dev(dev, link, ENABLED) {
  42                 /* We don't really care */
  43                 dev->pio_mode = XFER_PIO_0;
  44                 dev->xfer_mode = XFER_PIO_0;
  45                 dev->xfer_shift = ATA_SHIFT_PIO;
  46                 dev->flags |= ATA_DFLAG_PIO;
  47                 ata_dev_info(dev, "configured for PIO\n");
  48         }
  49         return 0;
  50 }
  51
  52
  53 static struct scsi_host_template rz1000_sht = {
  54         ATA_PIO_SHT(DRV_NAME),
  55 };
  56
  57 static struct ata_port_operations rz1000_port_ops = {
  58         .inherits       = &ata_sff_port_ops,
  59         .cable_detect   = ata_cable_40wire,
  60         .set_mode       = rz1000_set_mode,
  61 };
  62
  63 static int rz1000_fifo_disable(struct pci_dev *pdev)
  64 {
  65         u16 reg;
  66         /* Be exceptionally paranoid as we must be sure to apply the fix */
  67         if (pci_read_config_word(pdev, 0x40, &reg) != 0)
  68                 return -1;
  69         reg &= 0xDFFF;
  70         if (pci_write_config_word(pdev, 0x40, reg) != 0)
  71                 return -1;
  72         printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
  73         return 0;
  74 }
  75
  76 /**
  77  *      rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
  78  *      @pdev: PCI device to register
  79  *      @ent: Entry in rz1000_pci_tbl matching with @pdev
  80  *
  81  *      Configure an RZ1000 interface. This doesn't require much special
  82  *      handling except that we *MUST* kill the chipset readahead or the
  83  *      user may experience data corruption.
  84  */
  85
  86 static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
  87 {
  88         static const struct ata_port_info info = {
  89                 .flags = ATA_FLAG_SLAVE_POSS,
  90                 .pio_mask = ATA_PIO4,
  91                 .port_ops = &rz1000_port_ops
  92         };
  93         const struct ata_port_info *ppi[] = { &info, NULL };
  94
  95         ata_print_version_once(&pdev->dev, DRV_VERSION);
  96
  97         if (rz1000_fifo_disable(pdev) == 0)
  98                 return ata_pci_sff_init_one(pdev, ppi, &rz1000_sht, NULL, 0);
  99
 100         printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n");
 101         /* Not safe to use so skip */
 102         return -ENODEV;
 103 }
 104
 105 #ifdef CONFIG_PM_SLEEP
 106 static int rz1000_reinit_one(struct pci_dev *pdev)
 107 {
 108         struct ata_host *host = pci_get_drvdata(pdev);
 109         int rc;
 110
 111         rc = ata_pci_device_do_resume(pdev);
 112         if (rc)
 113                 return rc;
 114
 115         /* If this fails on resume (which is a "can't happen" case), we
 116            must stop as any progress risks data loss */
 117         if (rz1000_fifo_disable(pdev))
 118                 panic("rz1000 fifo");
 119
 120         ata_host_resume(host);
 121         return 0;
 122 }
 123 #endif
 124
 125 static const struct pci_device_id pata_rz1000[] = {
 126         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
 127         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },
 128
 129         { },
 130 };
 131
 132 static struct pci_driver rz1000_pci_driver = {
 133         .name           = DRV_NAME,
 134         .id_table       = pata_rz1000,
 135         .probe          = rz1000_init_one,
 136         .remove         = ata_pci_remove_one,
 137 #ifdef CONFIG_PM_SLEEP
 138         .suspend        = ata_pci_device_suspend,
 139         .resume         = rz1000_reinit_one,
 140 #endif
 141 };
 142
 143 module_pci_driver(rz1000_pci_driver);
 144
 145 MODULE_AUTHOR("Alan Cox");
 146 MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
 147 MODULE_LICENSE("GPL");
 148 MODULE_DEVICE_TABLE(pci, pata_rz1000);
 149 MODULE_VERSION(DRV_VERSION);