pata_rz1000.c 3.8 KB

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  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. #include <linux/kernel.h>
  15. #include <linux/module.h>
  16. #include <linux/pci.h>
  17. #include <linux/blkdev.h>
  18. #include <linux/delay.h>
  19. #include <scsi/scsi_host.h>
  20. #include <linux/libata.h>
  21. #define DRV_NAME "pata_rz1000"
  22. #define DRV_VERSION "0.2.4"
  23. /**
  24. * rz1000_set_mode - mode setting function
  25. * @link: ATA link
  26. * @unused: returned device on set_mode failure
  27. *
  28. * Use a non standard set_mode function. We don't want to be tuned. We
  29. * would prefer to be BIOS generic but for the fact our hardware is
  30. * whacked out.
  31. */
  32. static int rz1000_set_mode(struct ata_link *link, struct ata_device **unused)
  33. {
  34. struct ata_device *dev;
  35. ata_for_each_dev(dev, link, ENABLED) {
  36. /* We don't really care */
  37. dev->pio_mode = XFER_PIO_0;
  38. dev->xfer_mode = XFER_PIO_0;
  39. dev->xfer_shift = ATA_SHIFT_PIO;
  40. dev->flags |= ATA_DFLAG_PIO;
  41. ata_dev_info(dev, "configured for PIO\n");
  42. }
  43. return 0;
  44. }
  45. static struct scsi_host_template rz1000_sht = {
  46. ATA_PIO_SHT(DRV_NAME),
  47. };
  48. static struct ata_port_operations rz1000_port_ops = {
  49. .inherits = &ata_sff_port_ops,
  50. .cable_detect = ata_cable_40wire,
  51. .set_mode = rz1000_set_mode,
  52. };
  53. static int rz1000_fifo_disable(struct pci_dev *pdev)
  54. {
  55. u16 reg;
  56. /* Be exceptionally paranoid as we must be sure to apply the fix */
  57. if (pci_read_config_word(pdev, 0x40, &reg) != 0)
  58. return -1;
  59. reg &= 0xDFFF;
  60. if (pci_write_config_word(pdev, 0x40, reg) != 0)
  61. return -1;
  62. printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
  63. return 0;
  64. }
  65. /**
  66. * rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
  67. * @pdev: PCI device to register
  68. * @ent: Entry in rz1000_pci_tbl matching with @pdev
  69. *
  70. * Configure an RZ1000 interface. This doesn't require much special
  71. * handling except that we *MUST* kill the chipset readahead or the
  72. * user may experience data corruption.
  73. */
  74. static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
  75. {
  76. static const struct ata_port_info info = {
  77. .flags = ATA_FLAG_SLAVE_POSS,
  78. .pio_mask = ATA_PIO4,
  79. .port_ops = &rz1000_port_ops
  80. };
  81. const struct ata_port_info *ppi[] = { &info, NULL };
  82. ata_print_version_once(&pdev->dev, DRV_VERSION);
  83. if (rz1000_fifo_disable(pdev) == 0)
  84. return ata_pci_sff_init_one(pdev, ppi, &rz1000_sht, NULL, 0);
  85. printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n");
  86. /* Not safe to use so skip */
  87. return -ENODEV;
  88. }
  89. #ifdef CONFIG_PM_SLEEP
  90. static int rz1000_reinit_one(struct pci_dev *pdev)
  91. {
  92. struct ata_host *host = pci_get_drvdata(pdev);
  93. int rc;
  94. rc = ata_pci_device_do_resume(pdev);
  95. if (rc)
  96. return rc;
  97. /* If this fails on resume (which is a "can't happen" case), we
  98. must stop as any progress risks data loss */
  99. if (rz1000_fifo_disable(pdev))
  100. panic("rz1000 fifo");
  101. ata_host_resume(host);
  102. return 0;
  103. }
  104. #endif
  105. static const struct pci_device_id pata_rz1000[] = {
  106. { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
  107. { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },
  108. { },
  109. };
  110. static struct pci_driver rz1000_pci_driver = {
  111. .name = DRV_NAME,
  112. .id_table = pata_rz1000,
  113. .probe = rz1000_init_one,
  114. .remove = ata_pci_remove_one,
  115. #ifdef CONFIG_PM_SLEEP
  116. .suspend = ata_pci_device_suspend,
  117. .resume = rz1000_reinit_one,
  118. #endif
  119. };
  120. module_pci_driver(rz1000_pci_driver);
  121. MODULE_AUTHOR("Alan Cox");
  122. MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
  123. MODULE_LICENSE("GPL");
  124. MODULE_DEVICE_TABLE(pci, pata_rz1000);
  125. MODULE_VERSION(DRV_VERSION);