1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2009
4 * Graeme Russ, <graeme.russ@gmail.com>
5 *
6 * (C) Copyright 2007
7 * Daniel Hellstrom, Gaisler Research, <daniel@gaisler.com>
8 *
9 * (C) Copyright 2006
10 * Detlev Zundel, DENX Software Engineering, <dzu@denx.de>
11 *
12 * (C) Copyright -2003
13 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
14 *
15 * (C) Copyright 2002
16 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
17 *
18 * (C) Copyright 2001
19 * Josh Huber, Mission Critical Linux, Inc, <huber@mclx.com>
20 */
21
22 /*
23 * This file contains the high-level API for the interrupt sub-system
24 * of the x86 port of U-Boot. Most of the functionality has been
25 * shamelessly stolen from the leon2 / leon3 ports of U-Boot.
26 * Daniel Hellstrom, Detlev Zundel, Wolfgang Denk and Josh Huber are
27 * credited for the corresponding work on those ports. The original
28 * interrupt handling routines for the x86 port were written by
29 * Daniel Engström
30 */
31
32 #include <common.h>
33 #include <command.h>
34 #include <irq_func.h>
35 #include <asm/interrupt.h>
36
37 #if !CONFIG_IS_ENABLED(X86_64)
38
39 struct irq_action {
40 interrupt_handler_t *handler;
41 void *arg;
42 unsigned int count;
43 };
44
45 static struct irq_action irq_handlers[SYS_NUM_IRQS] = { {0} };
46 static int spurious_irq_cnt;
47 static int spurious_irq;
48
irq_install_handler(int irq,interrupt_handler_t * handler,void * arg)49 void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
50 {
51 int status;
52
53 if (irq < 0 || irq >= SYS_NUM_IRQS) {
54 printf("irq_install_handler: bad irq number %d\n", irq);
55 return;
56 }
57
58 if (irq_handlers[irq].handler != NULL)
59 printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
60 (ulong) handler,
61 (ulong) irq_handlers[irq].handler);
62
63 status = disable_interrupts();
64
65 irq_handlers[irq].handler = handler;
66 irq_handlers[irq].arg = arg;
67 irq_handlers[irq].count = 0;
68
69 if (CONFIG_IS_ENABLED(I8259_PIC))
70 unmask_irq(irq);
71
72 if (status)
73 enable_interrupts();
74
75 return;
76 }
77
irq_free_handler(int irq)78 void irq_free_handler(int irq)
79 {
80 int status;
81
82 if (irq < 0 || irq >= SYS_NUM_IRQS) {
83 printf("irq_free_handler: bad irq number %d\n", irq);
84 return;
85 }
86
87 status = disable_interrupts();
88
89 if (CONFIG_IS_ENABLED(I8259_PIC))
90 mask_irq(irq);
91
92 irq_handlers[irq].handler = NULL;
93 irq_handlers[irq].arg = NULL;
94
95 if (status)
96 enable_interrupts();
97
98 return;
99 }
100
do_irq(int hw_irq)101 void do_irq(int hw_irq)
102 {
103 int irq = hw_irq - 0x20;
104
105 if (irq < 0 || irq >= SYS_NUM_IRQS) {
106 printf("do_irq: bad irq number %d\n", irq);
107 return;
108 }
109
110 if (irq_handlers[irq].handler) {
111 if (CONFIG_IS_ENABLED(I8259_PIC))
112 mask_irq(irq);
113
114 irq_handlers[irq].handler(irq_handlers[irq].arg);
115 irq_handlers[irq].count++;
116
117 if (CONFIG_IS_ENABLED(I8259_PIC)) {
118 unmask_irq(irq);
119 specific_eoi(irq);
120 }
121 } else {
122 if ((irq & 7) != 7) {
123 spurious_irq_cnt++;
124 spurious_irq = irq;
125 }
126 }
127 }
128 #endif
129
130 #if defined(CONFIG_CMD_IRQ)
do_irqinfo(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])131 int do_irqinfo(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
132 {
133 #if !CONFIG_IS_ENABLED(X86_64)
134 struct idt_ptr ptr;
135 int irq;
136
137 interrupt_read_idt(&ptr);
138 printf("IDT at %lx, size %x\n", ptr.address, ptr.size);
139 printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
140 spurious_irq_cnt, spurious_irq);
141
142 printf("Interrupt-Information:\n");
143 printf("Nr Routine Arg Count\n");
144
145 for (irq = 0; irq < SYS_NUM_IRQS; irq++) {
146 if (irq_handlers[irq].handler != NULL) {
147 printf("%02d %08lx %08lx %d\n",
148 irq,
149 (ulong)irq_handlers[irq].handler,
150 (ulong)irq_handlers[irq].arg,
151 irq_handlers[irq].count);
152 }
153 }
154 #endif
155
156 return 0;
157 }
158 #endif
159