pata_opti.c 5.2 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * pata_opti.c - ATI PATA for new ATA layer
  4. * (C) 2005 Red Hat Inc
  5. *
  6. * Based on
  7. * linux/drivers/ide/pci/opti621.c Version 0.7 Sept 10, 2002
  8. *
  9. * Copyright (C) 1996-1998 Linus Torvalds & authors (see below)
  10. *
  11. * Authors:
  12. * Jaromir Koutek <miri@punknet.cz>,
  13. * Jan Harkes <jaharkes@cwi.nl>,
  14. * Mark Lord <mlord@pobox.com>
  15. * Some parts of code are from ali14xx.c and from rz1000.c.
  16. *
  17. * Also consulted the FreeBSD prototype driver by Kevin Day to try
  18. * and resolve some confusions. Further documentation can be found in
  19. * Ralf Brown's interrupt list
  20. *
  21. * If you have other variants of the Opti range (Viper/Vendetta) please
  22. * try this driver with those PCI idents and report back. For the later
  23. * chips see the pata_optidma driver
  24. *
  25. */
  26. #include <linux/kernel.h>
  27. #include <linux/module.h>
  28. #include <linux/pci.h>
  29. #include <linux/blkdev.h>
  30. #include <linux/delay.h>
  31. #include <scsi/scsi_host.h>
  32. #include <linux/libata.h>
  33. #define DRV_NAME "pata_opti"
  34. #define DRV_VERSION "0.2.9"
  35. enum {
  36. READ_REG = 0, /* index of Read cycle timing register */
  37. WRITE_REG = 1, /* index of Write cycle timing register */
  38. CNTRL_REG = 3, /* index of Control register */
  39. STRAP_REG = 5, /* index of Strap register */
  40. MISC_REG = 6 /* index of Miscellaneous register */
  41. };
  42. /**
  43. * opti_pre_reset - probe begin
  44. * @link: ATA link
  45. * @deadline: deadline jiffies for the operation
  46. *
  47. * Set up cable type and use generic probe init
  48. */
  49. static int opti_pre_reset(struct ata_link *link, unsigned long deadline)
  50. {
  51. struct ata_port *ap = link->ap;
  52. struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  53. static const struct pci_bits opti_enable_bits[] = {
  54. { 0x45, 1, 0x80, 0x00 },
  55. { 0x40, 1, 0x08, 0x00 }
  56. };
  57. if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no]))
  58. return -ENOENT;
  59. return ata_sff_prereset(link, deadline);
  60. }
  61. /**
  62. * opti_write_reg - control register setup
  63. * @ap: ATA port
  64. * @value: value
  65. * @reg: control register number
  66. *
  67. * The Opti uses magic 'trapdoor' register accesses to do configuration
  68. * rather than using PCI space as other controllers do. The double inw
  69. * on the error register activates configuration mode. We can then write
  70. * the control register
  71. */
  72. static void opti_write_reg(struct ata_port *ap, u8 val, int reg)
  73. {
  74. void __iomem *regio = ap->ioaddr.cmd_addr;
  75. /* These 3 unlock the control register access */
  76. ioread16(regio + 1);
  77. ioread16(regio + 1);
  78. iowrite8(3, regio + 2);
  79. /* Do the I/O */
  80. iowrite8(val, regio + reg);
  81. /* Relock */
  82. iowrite8(0x83, regio + 2);
  83. }
  84. /**
  85. * opti_set_piomode - set initial PIO mode data
  86. * @ap: ATA interface
  87. * @adev: ATA device
  88. *
  89. * Called to do the PIO mode setup. Timing numbers are taken from
  90. * the FreeBSD driver then pre computed to keep the code clean. There
  91. * are two tables depending on the hardware clock speed.
  92. */
  93. static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)
  94. {
  95. struct ata_device *pair = ata_dev_pair(adev);
  96. int clock;
  97. int pio = adev->pio_mode - XFER_PIO_0;
  98. void __iomem *regio = ap->ioaddr.cmd_addr;
  99. u8 addr;
  100. /* Address table precomputed with prefetch off and a DCLK of 2 */
  101. static const u8 addr_timing[2][5] = {
  102. { 0x30, 0x20, 0x20, 0x10, 0x10 },
  103. { 0x20, 0x20, 0x10, 0x10, 0x10 }
  104. };
  105. static const u8 data_rec_timing[2][5] = {
  106. { 0x6B, 0x56, 0x42, 0x32, 0x31 },
  107. { 0x58, 0x44, 0x32, 0x22, 0x21 }
  108. };
  109. iowrite8(0xff, regio + 5);
  110. clock = ioread16(regio + 5) & 1;
  111. /*
  112. * As with many controllers the address setup time is shared
  113. * and must suit both devices if present.
  114. */
  115. addr = addr_timing[clock][pio];
  116. if (pair) {
  117. /* Hardware constraint */
  118. u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];
  119. if (pair_addr > addr)
  120. addr = pair_addr;
  121. }
  122. /* Commence primary programming sequence */
  123. opti_write_reg(ap, adev->devno, MISC_REG);
  124. opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG);
  125. opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG);
  126. opti_write_reg(ap, addr, MISC_REG);
  127. /* Programming sequence complete, override strapping */
  128. opti_write_reg(ap, 0x85, CNTRL_REG);
  129. }
  130. static struct scsi_host_template opti_sht = {
  131. ATA_PIO_SHT(DRV_NAME),
  132. };
  133. static struct ata_port_operations opti_port_ops = {
  134. .inherits = &ata_sff_port_ops,
  135. .cable_detect = ata_cable_40wire,
  136. .set_piomode = opti_set_piomode,
  137. .prereset = opti_pre_reset,
  138. };
  139. static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)
  140. {
  141. static const struct ata_port_info info = {
  142. .flags = ATA_FLAG_SLAVE_POSS,
  143. .pio_mask = ATA_PIO4,
  144. .port_ops = &opti_port_ops
  145. };
  146. const struct ata_port_info *ppi[] = { &info, NULL };
  147. ata_print_version_once(&dev->dev, DRV_VERSION);
  148. return ata_pci_sff_init_one(dev, ppi, &opti_sht, NULL, 0);
  149. }
  150. static const struct pci_device_id opti[] = {
  151. { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
  152. { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 },
  153. { },
  154. };
  155. static struct pci_driver opti_pci_driver = {
  156. .name = DRV_NAME,
  157. .id_table = opti,
  158. .probe = opti_init_one,
  159. .remove = ata_pci_remove_one,
  160. #ifdef CONFIG_PM_SLEEP
  161. .suspend = ata_pci_device_suspend,
  162. .resume = ata_pci_device_resume,
  163. #endif
  164. };
  165. module_pci_driver(opti_pci_driver);
  166. MODULE_AUTHOR("Alan Cox");
  167. MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
  168. MODULE_LICENSE("GPL");
  169. MODULE_DEVICE_TABLE(pci, opti);
  170. MODULE_VERSION(DRV_VERSION);