1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Handle interrupts from the SRM, assuming no additional weirdness. 4 */ 5 6 #include <linux/init.h> 7 #include <linux/sched.h> 8 #include <linux/irq.h> 9 10 #include "proto.h" 11 #include "irq_impl.h" 12 13 14 /* 15 * Is the palcode SMP safe? In other words: can we call cserve_ena/dis 16 * at the same time in multiple CPUs? To be safe I added a spinlock 17 * but it can be removed trivially if the palcode is robust against smp. 18 */ 19 DEFINE_SPINLOCK(srm_irq_lock); 20 21 static inline void 22 srm_enable_irq(struct irq_data *d) 23 { 24 spin_lock(&srm_irq_lock); 25 cserve_ena(d->irq - 16); 26 spin_unlock(&srm_irq_lock); 27 } 28 29 static void 30 srm_disable_irq(struct irq_data *d) 31 { 32 spin_lock(&srm_irq_lock); 33 cserve_dis(d->irq - 16); 34 spin_unlock(&srm_irq_lock); 35 } 36 37 /* Handle interrupts from the SRM, assuming no additional weirdness. */ 38 static struct irq_chip srm_irq_type = { 39 .name = "SRM", 40 .irq_unmask = srm_enable_irq, 41 .irq_mask = srm_disable_irq, 42 .irq_mask_ack = srm_disable_irq, 43 }; 44 45 void __init 46 init_srm_irqs(long max, unsigned long ignore_mask) 47 { 48 long i; 49 50 if (NR_IRQS <= 16) 51 return; 52 for (i = 16; i < max; ++i) { 53 if (i < 64 && ((ignore_mask >> i) & 1)) 54 continue; 55 irq_set_chip_and_handler(i, &srm_irq_type, handle_level_irq); 56 irq_set_status_flags(i, IRQ_LEVEL); 57 } 58 } 59 60 void 61 srm_device_interrupt(unsigned long vector) 62 { 63 int irq = (vector - 0x800) >> 4; 64 handle_irq(irq); 65 } 66