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(lock: &srm_irq_lock); |
25 | cserve_ena(d->irq - 16); |
26 | spin_unlock(lock: &srm_irq_lock); |
27 | } |
28 | |
29 | static void |
30 | srm_disable_irq(struct irq_data *d) |
31 | { |
32 | spin_lock(lock: &srm_irq_lock); |
33 | cserve_dis(d->irq - 16); |
34 | spin_unlock(lock: &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(irq: i, chip: &srm_irq_type, handle: handle_level_irq); |
56 | irq_set_status_flags(irq: i, set: 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 | |