| 1 | // SPDX-License-Identifier: GPL-2.0 |
|---|---|
| 2 | #include <linux/interrupt.h> |
| 3 | #include <linux/irq.h> |
| 4 | |
| 5 | #include <asm/traps.h> |
| 6 | #include <asm/apollohw.h> |
| 7 | |
| 8 | #include "apollo.h" |
| 9 | |
| 10 | static unsigned int apollo_irq_startup(struct irq_data *data) |
| 11 | { |
| 12 | unsigned int irq = data->irq; |
| 13 | |
| 14 | if (irq < 8) |
| 15 | *(volatile unsigned char *)(pica+1) &= ~(1 << irq); |
| 16 | else |
| 17 | *(volatile unsigned char *)(picb+1) &= ~(1 << (irq - 8)); |
| 18 | return 0; |
| 19 | } |
| 20 | |
| 21 | static void apollo_irq_shutdown(struct irq_data *data) |
| 22 | { |
| 23 | unsigned int irq = data->irq; |
| 24 | |
| 25 | if (irq < 8) |
| 26 | *(volatile unsigned char *)(pica+1) |= (1 << irq); |
| 27 | else |
| 28 | *(volatile unsigned char *)(picb+1) |= (1 << (irq - 8)); |
| 29 | } |
| 30 | |
| 31 | static void apollo_irq_eoi(struct irq_data *data) |
| 32 | { |
| 33 | *(volatile unsigned char *)(pica) = 0x20; |
| 34 | *(volatile unsigned char *)(picb) = 0x20; |
| 35 | } |
| 36 | |
| 37 | static struct irq_chip apollo_irq_chip = { |
| 38 | .name = "apollo", |
| 39 | .irq_startup = apollo_irq_startup, |
| 40 | .irq_shutdown = apollo_irq_shutdown, |
| 41 | .irq_eoi = apollo_irq_eoi, |
| 42 | }; |
| 43 | |
| 44 | |
| 45 | void __init dn_init_IRQ(void) |
| 46 | { |
| 47 | m68k_setup_user_interrupt(VEC_USER + 96, 16); |
| 48 | m68k_setup_irq_controller(&apollo_irq_chip, handle_fasteoi_irq, |
| 49 | IRQ_APOLLO, 16); |
| 50 | } |
| 51 |