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