irq-renesas-h8300h.c 1.9 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * H8/300H interrupt controller driver
  4. *
  5. * Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
  6. */
  7. #include <linux/init.h>
  8. #include <linux/irq.h>
  9. #include <linux/irqchip.h>
  10. #include <linux/of_address.h>
  11. #include <linux/of_irq.h>
  12. #include <asm/io.h>
  13. static const char ipr_bit[] = {
  14. 7, 6, 5, 5,
  15. 4, 4, 4, 4, 3, 3, 3, 3,
  16. 2, 2, 2, 2, 1, 1, 1, 1,
  17. 0, 0, 0, 0, 15, 15, 15, 15,
  18. 14, 14, 14, 14, 13, 13, 13, 13,
  19. -1, -1, -1, -1, 11, 11, 11, 11,
  20. 10, 10, 10, 10, 9, 9, 9, 9,
  21. };
  22. static void __iomem *intc_baseaddr;
  23. #define IPR (intc_baseaddr + 6)
  24. static void h8300h_disable_irq(struct irq_data *data)
  25. {
  26. int bit;
  27. int irq = data->irq - 12;
  28. bit = ipr_bit[irq];
  29. if (bit >= 0) {
  30. if (bit < 8)
  31. ctrl_bclr(bit & 7, IPR);
  32. else
  33. ctrl_bclr(bit & 7, (IPR+1));
  34. }
  35. }
  36. static void h8300h_enable_irq(struct irq_data *data)
  37. {
  38. int bit;
  39. int irq = data->irq - 12;
  40. bit = ipr_bit[irq];
  41. if (bit >= 0) {
  42. if (bit < 8)
  43. ctrl_bset(bit & 7, IPR);
  44. else
  45. ctrl_bset(bit & 7, (IPR+1));
  46. }
  47. }
  48. struct irq_chip h8300h_irq_chip = {
  49. .name = "H8/300H-INTC",
  50. .irq_enable = h8300h_enable_irq,
  51. .irq_disable = h8300h_disable_irq,
  52. };
  53. static int irq_map(struct irq_domain *h, unsigned int virq,
  54. irq_hw_number_t hw_irq_num)
  55. {
  56. irq_set_chip_and_handler(virq, &h8300h_irq_chip, handle_simple_irq);
  57. return 0;
  58. }
  59. static const struct irq_domain_ops irq_ops = {
  60. .map = irq_map,
  61. .xlate = irq_domain_xlate_onecell,
  62. };
  63. static int __init h8300h_intc_of_init(struct device_node *intc,
  64. struct device_node *parent)
  65. {
  66. struct irq_domain *domain;
  67. intc_baseaddr = of_iomap(intc, 0);
  68. BUG_ON(!intc_baseaddr);
  69. /* All interrupt priority low */
  70. writeb(0x00, IPR + 0);
  71. writeb(0x00, IPR + 1);
  72. domain = irq_domain_add_linear(intc, NR_IRQS, &irq_ops, NULL);
  73. BUG_ON(!domain);
  74. irq_set_default_host(domain);
  75. return 0;
  76. }
  77. IRQCHIP_DECLARE(h8300h_intc, "renesas,h8300h-intc", h8300h_intc_of_init);