pata_of_platform.c 2.2 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * OF-platform PATA driver
  4. *
  5. * Copyright (c) 2007 MontaVista Software, Inc.
  6. * Anton Vorontsov <avorontsov@ru.mvista.com>
  7. */
  8. #include <linux/kernel.h>
  9. #include <linux/module.h>
  10. #include <linux/of_address.h>
  11. #include <linux/platform_device.h>
  12. #include <linux/ata_platform.h>
  13. #include <linux/libata.h>
  14. #define DRV_NAME "pata_of_platform"
  15. static struct scsi_host_template pata_platform_sht = {
  16. ATA_PIO_SHT(DRV_NAME),
  17. };
  18. static int pata_of_platform_probe(struct platform_device *ofdev)
  19. {
  20. int ret;
  21. struct device_node *dn = ofdev->dev.of_node;
  22. struct resource io_res;
  23. struct resource ctl_res;
  24. struct resource *irq_res;
  25. unsigned int reg_shift = 0;
  26. int pio_mode = 0;
  27. int pio_mask;
  28. bool use16bit;
  29. ret = of_address_to_resource(dn, 0, &io_res);
  30. if (ret) {
  31. dev_err(&ofdev->dev, "can't get IO address from "
  32. "device tree\n");
  33. return -EINVAL;
  34. }
  35. ret = of_address_to_resource(dn, 1, &ctl_res);
  36. if (ret) {
  37. dev_err(&ofdev->dev, "can't get CTL address from "
  38. "device tree\n");
  39. return -EINVAL;
  40. }
  41. irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
  42. of_property_read_u32(dn, "reg-shift", &reg_shift);
  43. if (!of_property_read_u32(dn, "pio-mode", &pio_mode)) {
  44. if (pio_mode > 6) {
  45. dev_err(&ofdev->dev, "invalid pio-mode\n");
  46. return -EINVAL;
  47. }
  48. } else {
  49. dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
  50. }
  51. use16bit = of_property_read_bool(dn, "ata-generic,use16bit");
  52. pio_mask = 1 << pio_mode;
  53. pio_mask |= (1 << pio_mode) - 1;
  54. return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res,
  55. reg_shift, pio_mask, &pata_platform_sht,
  56. use16bit);
  57. }
  58. static const struct of_device_id pata_of_platform_match[] = {
  59. { .compatible = "ata-generic", },
  60. { },
  61. };
  62. MODULE_DEVICE_TABLE(of, pata_of_platform_match);
  63. static struct platform_driver pata_of_platform_driver = {
  64. .driver = {
  65. .name = DRV_NAME,
  66. .of_match_table = pata_of_platform_match,
  67. },
  68. .probe = pata_of_platform_probe,
  69. .remove = ata_platform_remove_one,
  70. };
  71. module_platform_driver(pata_of_platform_driver);
  72. MODULE_DESCRIPTION("OF-platform PATA driver");
  73. MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
  74. MODULE_LICENSE("GPL");