2 * (C) Copyright 2011, Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
3 * (C) Copyright 2011, Julius Baxter <julius@opencores.org>
5 * SPDX-License-Identifier: GPL-2.0+
10 #include <asm/ptrace.h>
11 #include <asm/system.h>
12 #include <asm/openrisc_exc.h>
15 interrupt_handler_t *handler;
20 static struct irq_action handlers[32];
22 void interrupt_handler(void)
26 while ((irq = ffs(mfspr(SPR_PICSR)))) {
27 if (handlers[--irq].handler) {
28 handlers[irq].handler(handlers[irq].arg);
29 handlers[irq].count++;
31 /* disable the interrupt */
32 mtspr(SPR_PICMR, mfspr(SPR_PICMR) & ~(1 << irq));
33 printf("Unhandled interrupt: %d\n", irq);
35 /* clear the interrupt */
36 mtspr(SPR_PICSR, mfspr(SPR_PICSR) & ~(1 << irq));
40 int interrupt_init(void)
42 /* install handler for external interrupt exception */
43 exception_install_handler(EXC_EXT_IRQ, interrupt_handler);
44 /* Enable interrupts in supervisor register */
45 mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_IEE);
50 void enable_interrupts(void)
52 /* Set interrupt enable bit in supervisor register */
53 mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_IEE);
54 /* Enable timer exception */
55 mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_TEE);
58 int disable_interrupts(void)
60 /* Clear interrupt enable bit in supervisor register */
61 mtspr(SPR_SR, mfspr(SPR_SR) & ~SPR_SR_IEE);
62 /* Disable timer exception */
63 mtspr(SPR_SR, mfspr(SPR_SR) & ~SPR_SR_TEE);
68 void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
70 if (irq < 0 || irq > 31)
73 handlers[irq].handler = handler;
74 handlers[irq].arg = arg;
77 void irq_free_handler(int irq)
79 if (irq < 0 || irq > 31)
82 handlers[irq].handler = 0;
83 handlers[irq].arg = 0;
86 #if defined(CONFIG_CMD_IRQ)
87 int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
91 printf("\nInterrupt-Information:\n\n");
92 printf("Nr Routine Arg Count\n");
93 printf("-----------------------------\n");
95 for (i = 0; i < 32; i++) {
96 if (handlers[i].handler) {
97 printf("%02d %08lx %08lx %d\n",
99 (ulong)handlers[i].handler,
100 (ulong)handlers[i].arg,