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