miccpt-pci.c 1.7 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * arch/arm/mach-ixp4xx/miccpt-pci.c
  4. *
  5. * MICCPT board-level PCI initialization
  6. *
  7. * Copyright (C) 2002 Intel Corporation.
  8. * Copyright (C) 2003-2004 MontaVista Software, Inc.
  9. * Copyright (C) 2006 OMICRON electronics GmbH
  10. *
  11. * Author: Michael Jochum <michael.jochum@omicron.at>
  12. */
  13. #include <linux/kernel.h>
  14. #include <linux/pci.h>
  15. #include <linux/init.h>
  16. #include <linux/delay.h>
  17. #include <linux/irq.h>
  18. #include <asm/mach/pci.h>
  19. #include <asm/irq.h>
  20. #include <mach/hardware.h>
  21. #include <asm/mach-types.h>
  22. #include "irqs.h"
  23. #define MAX_DEV 4
  24. #define IRQ_LINES 4
  25. /* PCI controller GPIO to IRQ pin mappings */
  26. #define INTA 1
  27. #define INTB 2
  28. #define INTC 3
  29. #define INTD 4
  30. void __init miccpt_pci_preinit(void)
  31. {
  32. irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  33. irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  34. irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
  35. irq_set_irq_type(IXP4XX_GPIO_IRQ(INTD), IRQ_TYPE_LEVEL_LOW);
  36. ixp4xx_pci_preinit();
  37. }
  38. static int __init miccpt_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  39. {
  40. static int pci_irq_table[IRQ_LINES] = {
  41. IXP4XX_GPIO_IRQ(INTA),
  42. IXP4XX_GPIO_IRQ(INTB),
  43. IXP4XX_GPIO_IRQ(INTC),
  44. IXP4XX_GPIO_IRQ(INTD)
  45. };
  46. if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
  47. return pci_irq_table[(slot + pin - 2) % 4];
  48. return -1;
  49. }
  50. struct hw_pci miccpt_pci __initdata = {
  51. .nr_controllers = 1,
  52. .ops = &ixp4xx_ops,
  53. .preinit = miccpt_pci_preinit,
  54. .setup = ixp4xx_setup,
  55. .map_irq = miccpt_map_irq,
  56. };
  57. int __init miccpt_pci_init(void)
  58. {
  59. if (machine_is_miccpt())
  60. pci_common_init(&miccpt_pci);
  61. return 0;
  62. }
  63. subsys_initcall(miccpt_pci_init);