Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Handle interrupts from the SRM, assuming no additional weirdness.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include "proto.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include "irq_impl.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  * Is the palcode SMP safe? In other words: can we call cserve_ena/dis
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  * at the same time in multiple CPUs? To be safe I added a spinlock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  * but it can be removed trivially if the palcode is robust against smp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) DEFINE_SPINLOCK(srm_irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) srm_enable_irq(struct irq_data *d)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	spin_lock(&srm_irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	cserve_ena(d->irq - 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	spin_unlock(&srm_irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) srm_disable_irq(struct irq_data *d)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	spin_lock(&srm_irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	cserve_dis(d->irq - 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	spin_unlock(&srm_irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) /* Handle interrupts from the SRM, assuming no additional weirdness.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) static struct irq_chip srm_irq_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	.name		= "SRM",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	.irq_unmask	= srm_enable_irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	.irq_mask	= srm_disable_irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	.irq_mask_ack	= srm_disable_irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) void __init
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) init_srm_irqs(long max, unsigned long ignore_mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	long i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	if (NR_IRQS <= 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	for (i = 16; i < max; ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 		if (i < 64 && ((ignore_mask >> i) & 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 		irq_set_chip_and_handler(i, &srm_irq_type, handle_level_irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 		irq_set_status_flags(i, IRQ_LEVEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) void 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) srm_device_interrupt(unsigned long vector)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	int irq = (vector - 0x800) >> 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	handle_irq(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }