| Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| Yoshinori Sato | 883251d | 2015-05-11 02:36:51 +0900 | [diff] [blame] | 2 | /* |
| 3 | * linux/arch/h8300/kernel/irq.c |
| 4 | * |
| 5 | * Copyright 2014-2015 Yoshinori Sato <ysato@users.sourceforge.jp> |
| 6 | */ |
| 7 | |
| 8 | #include <linux/init.h> |
| 9 | #include <linux/interrupt.h> |
| 10 | #include <linux/irq.h> |
| 11 | #include <linux/irqdomain.h> |
| 12 | #include <linux/of_irq.h> |
| 13 | #include <asm/traps.h> |
| 14 | |
| 15 | #ifdef CONFIG_RAMKERNEL |
| 16 | typedef void (*h8300_vector)(void); |
| 17 | |
| 18 | static const h8300_vector __initconst trap_table[] = { |
| 19 | 0, 0, 0, 0, |
| 20 | _trace_break, |
| 21 | 0, 0, |
| 22 | _nmi, |
| 23 | _system_call, |
| 24 | 0, 0, |
| 25 | _trace_break, |
| 26 | }; |
| 27 | |
| 28 | static unsigned long __init *get_vector_address(void) |
| 29 | { |
| 30 | unsigned long *rom_vector = CPU_VECTOR; |
| 31 | unsigned long base, tmp; |
| 32 | int vec_no; |
| 33 | |
| 34 | base = rom_vector[EXT_IRQ0] & ADDR_MASK; |
| 35 | |
| 36 | /* check romvector format */ |
| 37 | for (vec_no = EXT_IRQ0 + 1; vec_no <= EXT_IRQ0+EXT_IRQS; vec_no++) { |
| 38 | if ((base+(vec_no - EXT_IRQ0)*4) != |
| 39 | (rom_vector[vec_no] & ADDR_MASK)) |
| 40 | return NULL; |
| 41 | } |
| 42 | |
| 43 | /* ramvector base address */ |
| 44 | base -= EXT_IRQ0*4; |
| 45 | |
| 46 | /* writerble? */ |
| 47 | tmp = ~(*(volatile unsigned long *)base); |
| 48 | (*(volatile unsigned long *)base) = tmp; |
| 49 | if ((*(volatile unsigned long *)base) != tmp) |
| 50 | return NULL; |
| 51 | return (unsigned long *)base; |
| 52 | } |
| 53 | |
| 54 | static void __init setup_vector(void) |
| 55 | { |
| 56 | int i; |
| 57 | unsigned long *ramvec, *ramvec_p; |
| 58 | const h8300_vector *trap_entry; |
| 59 | |
| 60 | ramvec = get_vector_address(); |
| 61 | if (ramvec == NULL) |
| 62 | panic("interrupt vector serup failed."); |
| 63 | else |
| 64 | pr_debug("virtual vector at 0x%p\n", ramvec); |
| 65 | |
| 66 | /* create redirect table */ |
| 67 | ramvec_p = ramvec; |
| 68 | trap_entry = trap_table; |
| 69 | for (i = 0; i < NR_IRQS; i++) { |
| 70 | if (i < 12) { |
| 71 | if (*trap_entry) |
| 72 | *ramvec_p = VECTOR(*trap_entry); |
| 73 | ramvec_p++; |
| 74 | trap_entry++; |
| 75 | } else |
| 76 | *ramvec_p++ = REDIRECT(_interrupt_entry); |
| 77 | } |
| 78 | _interrupt_redirect_table = ramvec; |
| 79 | } |
| 80 | #else |
| 81 | void setup_vector(void) |
| 82 | { |
| 83 | /* noting do */ |
| 84 | } |
| 85 | #endif |
| 86 | |
| 87 | void __init init_IRQ(void) |
| 88 | { |
| 89 | setup_vector(); |
| 90 | irqchip_init(); |
| 91 | } |
| 92 | |
| 93 | asmlinkage void do_IRQ(int irq) |
| 94 | { |
| 95 | irq_enter(); |
| 96 | generic_handle_irq(irq); |
| 97 | irq_exit(); |
| 98 | } |