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 <irq_func.h>
34 #include <asm/interrupt.h>
35
36 #if !CONFIG_IS_ENABLED(X86_64)
37
38 struct irq_action {
39 interrupt_handler_t *handler;
40 void *arg;
41 unsigned int count;
42 };
43
44 static struct irq_action irq_handlers[SYS_NUM_IRQS] = { {0} };
45 static int spurious_irq_cnt;
46 static int spurious_irq;
47
irq_install_handler(int irq,interrupt_handler_t * handler,void * arg)48 void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
49 {
50 int status;
51
52 if (irq < 0 || irq >= SYS_NUM_IRQS) {
53 printf("irq_install_handler: bad irq number %d\n", irq);
54 return;
55 }
56
57 if (irq_handlers[irq].handler != NULL)
58 printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
59 (ulong) handler,
60 (ulong) irq_handlers[irq].handler);
61
62 status = disable_interrupts();
63
64 irq_handlers[irq].handler = handler;
65 irq_handlers[irq].arg = arg;
66 irq_handlers[irq].count = 0;
67
68 if (CONFIG_IS_ENABLED(I8259_PIC))
69 unmask_irq(irq);
70
71 if (status)
72 enable_interrupts();
73
74 return;
75 }
76
irq_free_handler(int irq)77 void irq_free_handler(int irq)
78 {
79 int status;
80
81 if (irq < 0 || irq >= SYS_NUM_IRQS) {
82 printf("irq_free_handler: bad irq number %d\n", irq);
83 return;
84 }
85
86 status = disable_interrupts();
87
88 if (CONFIG_IS_ENABLED(I8259_PIC))
89 mask_irq(irq);
90
91 irq_handlers[irq].handler = NULL;
92 irq_handlers[irq].arg = NULL;
93
94 if (status)
95 enable_interrupts();
96
97 return;
98 }
99
do_irq(int hw_irq)100 void do_irq(int hw_irq)
101 {
102 int irq = hw_irq - 0x20;
103
104 if (irq < 0 || irq >= SYS_NUM_IRQS) {
105 printf("do_irq: bad irq number %d\n", irq);
106 return;
107 }
108
109 if (irq_handlers[irq].handler) {
110 if (CONFIG_IS_ENABLED(I8259_PIC))
111 mask_irq(irq);
112
113 irq_handlers[irq].handler(irq_handlers[irq].arg);
114 irq_handlers[irq].count++;
115
116 if (CONFIG_IS_ENABLED(I8259_PIC)) {
117 unmask_irq(irq);
118 specific_eoi(irq);
119 }
120 } else {
121 if ((irq & 7) != 7) {
122 spurious_irq_cnt++;
123 spurious_irq = irq;
124 }
125 }
126 }
127 #endif
128
129 #if defined(CONFIG_CMD_IRQ)
do_irqinfo(cmd_tbl_t * cmdtp,int flag,int argc,char * const argv[])130 int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
131 {
132 #if !CONFIG_IS_ENABLED(X86_64)
133 int irq;
134
135 printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
136 spurious_irq_cnt, spurious_irq);
137
138 printf("Interrupt-Information:\n");
139 printf("Nr Routine Arg Count\n");
140
141 for (irq = 0; irq < SYS_NUM_IRQS; irq++) {
142 if (irq_handlers[irq].handler != NULL) {
143 printf("%02d %08lx %08lx %d\n",
144 irq,
145 (ulong)irq_handlers[irq].handler,
146 (ulong)irq_handlers[irq].arg,
147 irq_handlers[irq].count);
148 }
149 }
150 #endif
151
152 return 0;
153 }
154 #endif
155