1 /*
2 * Copyright (c) 2015 Intel corporation
3 * Copyright (c) 2022 Synopsys
4 *
5 * SPDX-License-Identifier: Apache-2.0
6 */
7
8 /**
9 * @file Software interrupts utility code - ARC implementation
10 */
11
12 #include <zephyr/kernel.h>
13 #include <zephyr/irq_offload.h>
14 #include <zephyr/init.h>
15
16 /* Choose a reasonable default for interrupt line which is used for irq_offload with the option
17 * to override it by setting interrupt line via device tree.
18 */
19 #if DT_NODE_EXISTS(DT_NODELABEL(test_irq_offload_line_0))
20 #define IRQ_OFFLOAD_LINE DT_IRQN(DT_NODELABEL(test_irq_offload_line_0))
21 #else
22 /* Last two lined are already used in the IRQ tests, so we choose 3rd from the end line */
23 #define IRQ_OFFLOAD_LINE (CONFIG_NUM_IRQS - 3)
24 #endif
25
26 #define IRQ_OFFLOAD_PRIO 0
27
28 #define CURR_CPU (IS_ENABLED(CONFIG_SMP) ? arch_curr_cpu()->id : 0)
29
30 static struct {
31 volatile irq_offload_routine_t fn;
32 const void *volatile arg;
33 } offload_params[CONFIG_MP_MAX_NUM_CPUS];
34
arc_irq_offload_handler(const void * unused)35 static void arc_irq_offload_handler(const void *unused)
36 {
37 ARG_UNUSED(unused);
38
39 offload_params[CURR_CPU].fn(offload_params[CURR_CPU].arg);
40 }
41
arch_irq_offload(irq_offload_routine_t routine,const void * parameter)42 void arch_irq_offload(irq_offload_routine_t routine, const void *parameter)
43 {
44 offload_params[CURR_CPU].fn = routine;
45 offload_params[CURR_CPU].arg = parameter;
46 compiler_barrier();
47
48 z_arc_v2_aux_reg_write(_ARC_V2_AUX_IRQ_HINT, IRQ_OFFLOAD_LINE);
49
50 __asm__ volatile("sync");
51
52 /* If _current was aborted in the offload routine, we shouldn't be here */
53 __ASSERT_NO_MSG((_current->base.thread_state & _THREAD_DEAD) == 0);
54 }
55
56 /* need to be executed on every core in the system */
arc_irq_offload_init(void)57 int arc_irq_offload_init(void)
58 {
59
60 IRQ_CONNECT(IRQ_OFFLOAD_LINE, IRQ_OFFLOAD_PRIO, arc_irq_offload_handler, NULL, 0);
61
62 /* The line is triggered and controlled with core private interrupt controller,
63 * so even in case common (IDU) interrupt line usage on SMP we need to enable it not
64 * with generic irq_enable() but via z_arc_v2_irq_unit_int_enable().
65 */
66 z_arc_v2_irq_unit_int_enable(IRQ_OFFLOAD_LINE);
67
68 return 0;
69 }
70
71 SYS_INIT(arc_irq_offload_init, POST_KERNEL, 0);
72
