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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /arch/alpha/kernel/irq_srm.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/alpha/kernel/irq_srm.c')
-rw-r--r-- | arch/alpha/kernel/irq_srm.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/arch/alpha/kernel/irq_srm.c b/arch/alpha/kernel/irq_srm.c new file mode 100644 index 0000000000..bfacd6a061 --- /dev/null +++ b/arch/alpha/kernel/irq_srm.c @@ -0,0 +1,65 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Handle interrupts from the SRM, assuming no additional weirdness. + */ + +#include <linux/init.h> +#include <linux/sched.h> +#include <linux/irq.h> + +#include "proto.h" +#include "irq_impl.h" + + +/* + * Is the palcode SMP safe? In other words: can we call cserve_ena/dis + * at the same time in multiple CPUs? To be safe I added a spinlock + * but it can be removed trivially if the palcode is robust against smp. + */ +DEFINE_SPINLOCK(srm_irq_lock); + +static inline void +srm_enable_irq(struct irq_data *d) +{ + spin_lock(&srm_irq_lock); + cserve_ena(d->irq - 16); + spin_unlock(&srm_irq_lock); +} + +static void +srm_disable_irq(struct irq_data *d) +{ + spin_lock(&srm_irq_lock); + cserve_dis(d->irq - 16); + spin_unlock(&srm_irq_lock); +} + +/* Handle interrupts from the SRM, assuming no additional weirdness. */ +static struct irq_chip srm_irq_type = { + .name = "SRM", + .irq_unmask = srm_enable_irq, + .irq_mask = srm_disable_irq, + .irq_mask_ack = srm_disable_irq, +}; + +void __init +init_srm_irqs(long max, unsigned long ignore_mask) +{ + long i; + + if (NR_IRQS <= 16) + return; + for (i = 16; i < max; ++i) { + if (i < 64 && ((ignore_mask >> i) & 1)) + continue; + irq_set_chip_and_handler(i, &srm_irq_type, handle_level_irq); + irq_set_status_flags(i, IRQ_LEVEL); + } +} + +void +srm_device_interrupt(unsigned long vector) +{ + int irq = (vector - 0x800) >> 4; + handle_irq(irq); +} |