1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * (C) Copyright 2009
3*4882a593Smuzhiyun * Graeme Russ, <graeme.russ@gmail.com>
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * (C) Copyright 2007
6*4882a593Smuzhiyun * Daniel Hellstrom, Gaisler Research, <daniel@gaisler.com>
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * (C) Copyright 2006
9*4882a593Smuzhiyun * Detlev Zundel, DENX Software Engineering, <dzu@denx.de>
10*4882a593Smuzhiyun *
11*4882a593Smuzhiyun * (C) Copyright -2003
12*4882a593Smuzhiyun * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
13*4882a593Smuzhiyun *
14*4882a593Smuzhiyun * (C) Copyright 2002
15*4882a593Smuzhiyun * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
16*4882a593Smuzhiyun *
17*4882a593Smuzhiyun * (C) Copyright 2001
18*4882a593Smuzhiyun * Josh Huber, Mission Critical Linux, Inc, <huber@mclx.com>
19*4882a593Smuzhiyun *
20*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
21*4882a593Smuzhiyun */
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun /*
24*4882a593Smuzhiyun * This file contains the high-level API for the interrupt sub-system
25*4882a593Smuzhiyun * of the x86 port of U-Boot. Most of the functionality has been
26*4882a593Smuzhiyun * shamelessly stolen from the leon2 / leon3 ports of U-Boot.
27*4882a593Smuzhiyun * Daniel Hellstrom, Detlev Zundel, Wolfgang Denk and Josh Huber are
28*4882a593Smuzhiyun * credited for the corresponding work on those ports. The original
29*4882a593Smuzhiyun * interrupt handling routines for the x86 port were written by
30*4882a593Smuzhiyun * Daniel Engström
31*4882a593Smuzhiyun */
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun #include <common.h>
34*4882a593Smuzhiyun #include <asm/interrupt.h>
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun #if !CONFIG_IS_ENABLED(X86_64)
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun struct irq_action {
39*4882a593Smuzhiyun interrupt_handler_t *handler;
40*4882a593Smuzhiyun void *arg;
41*4882a593Smuzhiyun unsigned int count;
42*4882a593Smuzhiyun };
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun static struct irq_action irq_handlers[SYS_NUM_IRQS] = { {0} };
45*4882a593Smuzhiyun static int spurious_irq_cnt;
46*4882a593Smuzhiyun static int spurious_irq;
47*4882a593Smuzhiyun
irq_install_handler(int irq,interrupt_handler_t * handler,void * arg)48*4882a593Smuzhiyun void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
49*4882a593Smuzhiyun {
50*4882a593Smuzhiyun int status;
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun if (irq < 0 || irq >= SYS_NUM_IRQS) {
53*4882a593Smuzhiyun printf("irq_install_handler: bad irq number %d\n", irq);
54*4882a593Smuzhiyun return;
55*4882a593Smuzhiyun }
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun if (irq_handlers[irq].handler != NULL)
58*4882a593Smuzhiyun printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
59*4882a593Smuzhiyun (ulong) handler,
60*4882a593Smuzhiyun (ulong) irq_handlers[irq].handler);
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun status = disable_interrupts();
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun irq_handlers[irq].handler = handler;
65*4882a593Smuzhiyun irq_handlers[irq].arg = arg;
66*4882a593Smuzhiyun irq_handlers[irq].count = 0;
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun unmask_irq(irq);
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun if (status)
71*4882a593Smuzhiyun enable_interrupts();
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun return;
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun
irq_free_handler(int irq)76*4882a593Smuzhiyun void irq_free_handler(int irq)
77*4882a593Smuzhiyun {
78*4882a593Smuzhiyun int status;
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun if (irq < 0 || irq >= SYS_NUM_IRQS) {
81*4882a593Smuzhiyun printf("irq_free_handler: bad irq number %d\n", irq);
82*4882a593Smuzhiyun return;
83*4882a593Smuzhiyun }
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun status = disable_interrupts();
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun mask_irq(irq);
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun irq_handlers[irq].handler = NULL;
90*4882a593Smuzhiyun irq_handlers[irq].arg = NULL;
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun if (status)
93*4882a593Smuzhiyun enable_interrupts();
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun return;
96*4882a593Smuzhiyun }
97*4882a593Smuzhiyun
do_irq(int hw_irq)98*4882a593Smuzhiyun void do_irq(int hw_irq)
99*4882a593Smuzhiyun {
100*4882a593Smuzhiyun int irq = hw_irq - 0x20;
101*4882a593Smuzhiyun
102*4882a593Smuzhiyun if (irq < 0 || irq >= SYS_NUM_IRQS) {
103*4882a593Smuzhiyun printf("do_irq: bad irq number %d\n", irq);
104*4882a593Smuzhiyun return;
105*4882a593Smuzhiyun }
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun if (irq_handlers[irq].handler) {
108*4882a593Smuzhiyun mask_irq(irq);
109*4882a593Smuzhiyun
110*4882a593Smuzhiyun irq_handlers[irq].handler(irq_handlers[irq].arg);
111*4882a593Smuzhiyun irq_handlers[irq].count++;
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun unmask_irq(irq);
114*4882a593Smuzhiyun specific_eoi(irq);
115*4882a593Smuzhiyun
116*4882a593Smuzhiyun } else {
117*4882a593Smuzhiyun if ((irq & 7) != 7) {
118*4882a593Smuzhiyun spurious_irq_cnt++;
119*4882a593Smuzhiyun spurious_irq = irq;
120*4882a593Smuzhiyun }
121*4882a593Smuzhiyun }
122*4882a593Smuzhiyun }
123*4882a593Smuzhiyun #endif
124*4882a593Smuzhiyun
125*4882a593Smuzhiyun #if defined(CONFIG_CMD_IRQ)
do_irqinfo(cmd_tbl_t * cmdtp,int flag,int argc,char * const argv[])126*4882a593Smuzhiyun int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
127*4882a593Smuzhiyun {
128*4882a593Smuzhiyun #if !CONFIG_IS_ENABLED(X86_64)
129*4882a593Smuzhiyun int irq;
130*4882a593Smuzhiyun
131*4882a593Smuzhiyun printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
132*4882a593Smuzhiyun spurious_irq_cnt, spurious_irq);
133*4882a593Smuzhiyun
134*4882a593Smuzhiyun printf("Interrupt-Information:\n");
135*4882a593Smuzhiyun printf("Nr Routine Arg Count\n");
136*4882a593Smuzhiyun
137*4882a593Smuzhiyun for (irq = 0; irq < SYS_NUM_IRQS; irq++) {
138*4882a593Smuzhiyun if (irq_handlers[irq].handler != NULL) {
139*4882a593Smuzhiyun printf("%02d %08lx %08lx %d\n",
140*4882a593Smuzhiyun irq,
141*4882a593Smuzhiyun (ulong)irq_handlers[irq].handler,
142*4882a593Smuzhiyun (ulong)irq_handlers[irq].arg,
143*4882a593Smuzhiyun irq_handlers[irq].count);
144*4882a593Smuzhiyun }
145*4882a593Smuzhiyun }
146*4882a593Smuzhiyun #endif
147*4882a593Smuzhiyun
148*4882a593Smuzhiyun return 0;
149*4882a593Smuzhiyun }
150*4882a593Smuzhiyun #endif
151