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65 lines
1.4 KiB
65 lines
1.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Handle interrupts from the SRM, assuming no additional weirdness. |
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*/ |
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#include <linux/init.h> |
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#include <linux/sched.h> |
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#include <linux/irq.h> |
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#include "proto.h" |
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#include "irq_impl.h" |
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/* |
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* Is the palcode SMP safe? In other words: can we call cserve_ena/dis |
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* at the same time in multiple CPUs? To be safe I added a spinlock |
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* but it can be removed trivially if the palcode is robust against smp. |
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*/ |
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DEFINE_SPINLOCK(srm_irq_lock); |
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static inline void |
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srm_enable_irq(struct irq_data *d) |
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{ |
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spin_lock(&srm_irq_lock); |
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cserve_ena(d->irq - 16); |
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spin_unlock(&srm_irq_lock); |
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} |
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static void |
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srm_disable_irq(struct irq_data *d) |
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{ |
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spin_lock(&srm_irq_lock); |
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cserve_dis(d->irq - 16); |
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spin_unlock(&srm_irq_lock); |
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} |
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/* Handle interrupts from the SRM, assuming no additional weirdness. */ |
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static struct irq_chip srm_irq_type = { |
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.name = "SRM", |
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.irq_unmask = srm_enable_irq, |
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.irq_mask = srm_disable_irq, |
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.irq_mask_ack = srm_disable_irq, |
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}; |
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void __init |
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init_srm_irqs(long max, unsigned long ignore_mask) |
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{ |
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long i; |
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if (NR_IRQS <= 16) |
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return; |
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for (i = 16; i < max; ++i) { |
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if (i < 64 && ((ignore_mask >> i) & 1)) |
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continue; |
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irq_set_chip_and_handler(i, &srm_irq_type, handle_level_irq); |
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irq_set_status_flags(i, IRQ_LEVEL); |
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} |
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} |
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void |
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srm_device_interrupt(unsigned long vector) |
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{ |
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int irq = (vector - 0x800) >> 4; |
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handle_irq(irq); |
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}
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