Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 hw_interrupt_type srm_irq_type = { |
| 52 | .typename = "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 | for (i = 16; i < max; ++i) { |
| 67 | if (i < 64 && ((ignore_mask >> i) & 1)) |
| 68 | continue; |
| 69 | irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL; |
Ingo Molnar | d1bef4e | 2006-06-29 02:24:36 -0700 | [diff] [blame] | 70 | irq_desc[i].chip = &srm_irq_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | } |
| 72 | } |
| 73 | |
| 74 | void |
| 75 | srm_device_interrupt(unsigned long vector, struct pt_regs * regs) |
| 76 | { |
| 77 | int irq = (vector - 0x800) >> 4; |
| 78 | handle_irq(irq, regs); |
| 79 | } |