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(unsigned int irq) 22 { 23 spin_lock(&srm_irq_lock); 24 cserve_ena(irq - 16); 25 spin_unlock(&srm_irq_lock); 26 } 27 28 static void 29 srm_disable_irq(unsigned int irq) 30 { 31 spin_lock(&srm_irq_lock); 32 cserve_dis(irq - 16); 33 spin_unlock(&srm_irq_lock); 34 } 35 36 static unsigned int 37 srm_startup_irq(unsigned int irq) 38 { 39 srm_enable_irq(irq); 40 return 0; 41 } 42 43 static void 44 srm_end_irq(unsigned int irq) 45 { 46 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) 47 srm_enable_irq(irq); 48 } 49 50 /* Handle interrupts from the SRM, assuming no additional weirdness. */ 51 static struct irq_chip srm_irq_type = { 52 .name = "SRM", 53 .startup = srm_startup_irq, 54 .shutdown = srm_disable_irq, 55 .enable = srm_enable_irq, 56 .disable = srm_disable_irq, 57 .ack = srm_disable_irq, 58 .end = srm_end_irq, 59 }; 60 61 void __init 62 init_srm_irqs(long max, unsigned long ignore_mask) 63 { 64 long i; 65 66 if (NR_IRQS <= 16) 67 return; 68 for (i = 16; i < max; ++i) { 69 if (i < 64 && ((ignore_mask >> i) & 1)) 70 continue; 71 irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL; 72 irq_desc[i].chip = &srm_irq_type; 73 } 74 } 75 76 void 77 srm_device_interrupt(unsigned long vector) 78 { 79 int irq = (vector - 0x800) >> 4; 80 handle_irq(irq); 81 } 82