1 /*
2 * Copyright (c) 2014 Wind River Systems, Inc.
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 /**
8 * @file
9 * @brief ARCv2 interrupt management
10 *
11 *
12 * Interrupt management:
13 *
14 * - enabling/disabling
15 *
16 * An IRQ number passed to the @a irq parameters found in this file is a
17 * number from 16 to last IRQ number on the platform.
18 */
19
20 #include <kernel.h>
21 #include <arch/cpu.h>
22 #include <sys/__assert.h>
23 #include <toolchain.h>
24 #include <linker/sections.h>
25 #include <sw_isr_table.h>
26 #include <irq.h>
27 #include <sys/printk.h>
28
29
30 /*
31 * storage space for the interrupt stack of fast_irq
32 */
33 #if defined(CONFIG_ARC_FIRQ_STACK)
34 #if defined(CONFIG_SMP)
35 K_KERNEL_STACK_ARRAY_DEFINE(_firq_interrupt_stack, CONFIG_MP_NUM_CPUS,
36 CONFIG_ARC_FIRQ_STACK_SIZE);
37 #else
38 K_KERNEL_STACK_DEFINE(_firq_interrupt_stack, CONFIG_ARC_FIRQ_STACK_SIZE);
39 #endif
40
41 /*
42 * @brief Set the stack pointer for firq handling
43 *
44 * @return N/A
45 */
z_arc_firq_stack_set(void)46 void z_arc_firq_stack_set(void)
47 {
48 #ifdef CONFIG_SMP
49 char *firq_sp = Z_KERNEL_STACK_BUFFER(
50 _firq_interrupt_stack[z_arc_v2_core_id()]) +
51 CONFIG_ARC_FIRQ_STACK_SIZE;
52 #else
53 char *firq_sp = Z_KERNEL_STACK_BUFFER(_firq_interrupt_stack) +
54 CONFIG_ARC_FIRQ_STACK_SIZE;
55 #endif
56
57 /* the z_arc_firq_stack_set must be called when irq diasbled, as
58 * it can be called not only in the init phase but also other places
59 */
60 unsigned int key = arch_irq_lock();
61
62 __asm__ volatile (
63 /* only ilink will not be banked, so use ilink as channel
64 * between 2 banks
65 */
66 "mov %%ilink, %0\n\t"
67 "lr %0, [%1]\n\t"
68 "or %0, %0, %2\n\t"
69 "kflag %0\n\t"
70 "mov %%sp, %%ilink\n\t"
71 /* switch back to bank0, use ilink to avoid the pollution of
72 * bank1's gp regs.
73 */
74 "lr %%ilink, [%1]\n\t"
75 "and %%ilink, %%ilink, %3\n\t"
76 "kflag %%ilink\n\t"
77 :
78 : "r"(firq_sp), "i"(_ARC_V2_STATUS32),
79 "i"(_ARC_V2_STATUS32_RB(1)),
80 "i"(~_ARC_V2_STATUS32_RB(7))
81 );
82 arch_irq_unlock(key);
83 }
84 #endif
85
86 /*
87 * @brief Enable an interrupt line
88 *
89 * Clear possible pending interrupts on the line, and enable the interrupt
90 * line. After this call, the CPU will receive interrupts for the specified
91 * @a irq.
92 *
93 * @return N/A
94 */
95
arch_irq_enable(unsigned int irq)96 void arch_irq_enable(unsigned int irq)
97 {
98 z_arc_v2_irq_unit_int_enable(irq);
99 }
100
101 /*
102 * @brief Disable an interrupt line
103 *
104 * Disable an interrupt line. After this call, the CPU will stop receiving
105 * interrupts for the specified @a irq.
106 *
107 * @return N/A
108 */
109
arch_irq_disable(unsigned int irq)110 void arch_irq_disable(unsigned int irq)
111 {
112 z_arc_v2_irq_unit_int_disable(irq);
113 }
114
115 /**
116 * @brief Return IRQ enable state
117 *
118 * @param irq IRQ line
119 * @return interrupt enable state, true or false
120 */
arch_irq_is_enabled(unsigned int irq)121 int arch_irq_is_enabled(unsigned int irq)
122 {
123 return z_arc_v2_irq_unit_int_enabled(irq);
124 }
125
126 /*
127 * @internal
128 *
129 * @brief Set an interrupt's priority
130 *
131 * Lower values take priority over higher values. Special case priorities are
132 * expressed via mutually exclusive flags.
133
134 * The priority is verified if ASSERT_ON is enabled; max priority level
135 * depends on CONFIG_NUM_IRQ_PRIO_LEVELS.
136 *
137 * @return N/A
138 */
139
z_irq_priority_set(unsigned int irq,unsigned int prio,uint32_t flags)140 void z_irq_priority_set(unsigned int irq, unsigned int prio, uint32_t flags)
141 {
142 ARG_UNUSED(flags);
143
144 __ASSERT(prio < CONFIG_NUM_IRQ_PRIO_LEVELS,
145 "invalid priority %d for irq %d", prio, irq);
146 /* 0 -> CONFIG_NUM_IRQ_PRIO_LEVELS allocted to secure world
147 * left prio levels allocated to normal world
148 */
149 #if defined(CONFIG_ARC_SECURE_FIRMWARE)
150 prio = prio < ARC_N_IRQ_START_LEVEL ?
151 prio : (ARC_N_IRQ_START_LEVEL - 1);
152 #elif defined(CONFIG_ARC_NORMAL_FIRMWARE)
153 prio = prio < ARC_N_IRQ_START_LEVEL ?
154 ARC_N_IRQ_START_LEVEL : prio;
155 #endif
156 z_arc_v2_irq_unit_prio_set(irq, prio);
157 }
158
159 /*
160 * @brief Spurious interrupt handler
161 *
162 * Installed in all dynamic interrupt slots at boot time. Throws an error if
163 * called.
164 *
165 * @return N/A
166 */
167
z_irq_spurious(const void * unused)168 void z_irq_spurious(const void *unused)
169 {
170 ARG_UNUSED(unused);
171 z_fatal_error(K_ERR_SPURIOUS_IRQ, NULL);
172 }
173
174 #ifdef CONFIG_DYNAMIC_INTERRUPTS
arch_irq_connect_dynamic(unsigned int irq,unsigned int priority,void (* routine)(const void * parameter),const void * parameter,uint32_t flags)175 int arch_irq_connect_dynamic(unsigned int irq, unsigned int priority,
176 void (*routine)(const void *parameter),
177 const void *parameter, uint32_t flags)
178 {
179 z_isr_install(irq, routine, parameter);
180 z_irq_priority_set(irq, priority, flags);
181 return irq;
182 }
183 #endif /* CONFIG_DYNAMIC_INTERRUPTS */
184
