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