summaryrefslogtreecommitdiffstats
path: root/arch/sparc/cpu/leon3/interrupts.c
blob: 4138f9b673de19944b49d7370b5f52827e1d3563 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
/*
 * (C) Copyright 2007
 * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com
 *
 * (C) Copyright 2006
 * Detlev Zundel, DENX Software Engineering, dzu@denx.de
 *
 * (C) Copyright -2003
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * (C) Copyright 2001
 * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <asm/stack.h>
#include <common.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <command.h>
#include <asm/irq.h>

#include <asm/leon.h>
#include <ambapp.h>

/* 15 normal irqs and a non maskable interrupt */
#define NR_IRQS 15

struct irq_action {
	interrupt_handler_t *handler;
	void *arg;
	unsigned int count;
};

extern ambapp_dev_irqmp *irqmp;
extern ambapp_dev_gptimer *gptimer;

static struct irq_action irq_handlers[NR_IRQS] = { {0}, };
static int spurious_irq_cnt = 0;
static int spurious_irq = 0;

static inline unsigned int irqmp_get_irqmask(unsigned int irq)
{
	if ((irq < 0) || (irq >= NR_IRQS)) {
		return 0;
	} else {
		return (1 << irq);
	}

}

static void leon3_ic_disable(unsigned int irq)
{
	unsigned int mask, pil;
	if (!irqmp)
		return;

	pil = intLock();

	/* get mask of interrupt */
	mask = irqmp_get_irqmask(irq);

	/* set int level */
	irqmp->cpu_mask[0] = SPARC_NOCACHE_READ(&irqmp->cpu_mask[0]) & (~mask);

	intUnlock(pil);
}

static void leon3_ic_enable(unsigned int irq)
{
	unsigned int mask, pil;
	if (!irqmp)
		return;

	pil = intLock();

	/* get mask of interrupt */
	mask = irqmp_get_irqmask(irq);

	/* set int level */
	irqmp->cpu_mask[0] = SPARC_NOCACHE_READ(&irqmp->cpu_mask[0]) | mask;

	intUnlock(pil);

}

void handler_irq(int irq, struct pt_regs *regs)
{
	if (irq_handlers[irq].handler) {
		if (((unsigned int)irq_handlers[irq].handler > CONFIG_SYS_RAM_END) ||
		    ((unsigned int)irq_handlers[irq].handler < CONFIG_SYS_RAM_BASE)
		    ) {
			printf("handler_irq: bad handler: %x, irq number %d\n",
			       (unsigned int)irq_handlers[irq].handler, irq);
			return;
		}
		irq_handlers[irq].handler(irq_handlers[irq].arg);
		irq_handlers[irq].count++;
	} else {
		spurious_irq_cnt++;
		spurious_irq = irq;
	}
}

void leon3_force_int(int irq)
{
	if (!irqmp || (irq >= NR_IRQS) || (irq < 0))
		return;
	printf("Forcing interrupt %d\n", irq);

	irqmp->iforce = SPARC_NOCACHE_READ(&irqmp->iforce) | (1 << irq);
}

/****************************************************************************/

int interrupt_init_cpu(void)
{

	return (0);
}

/****************************************************************************/

/* Handle Timer 0 IRQ */
void timer_interrupt_cpu(void *arg)
{
	gptimer->e[0].ctrl = (LEON3_GPTIMER_EN |
			      LEON3_GPTIMER_RL |
			      LEON3_GPTIMER_LD | LEON3_GPTIMER_IRQEN);
	/* nothing to do here */
	return;
}

/****************************************************************************/

/*
 * Install and free a interrupt handler.
 */

void irq_install_handler(int irq, interrupt_handler_t * handler, void *arg)
{
	if (irq < 0 || irq >= NR_IRQS) {
		printf("irq_install_handler: bad irq number %d\n", irq);
		return;
	}

	if (irq_handlers[irq].handler != NULL)
		printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
		       (ulong) handler, (ulong) irq_handlers[irq].handler);

	if (((unsigned int)handler > CONFIG_SYS_RAM_END) ||
	    ((unsigned int)handler < CONFIG_SYS_RAM_BASE)
	    ) {
		printf("irq_install_handler: bad handler: %x, irq number %d\n",
		       (unsigned int)handler, irq);
		return;
	}
	irq_handlers[irq].handler = handler;
	irq_handlers[irq].arg = arg;

	/* enable irq on IRQMP hardware */
	leon3_ic_enable(irq);

}

void irq_free_handler(int irq)
{
	if (irq < 0 || irq >= NR_IRQS) {
		printf("irq_free_handler: bad irq number %d\n", irq);
		return;
	}

	/* disable irq on IRQMP hardware */
	leon3_ic_disable(irq);

	irq_handlers[irq].handler = NULL;
	irq_handlers[irq].arg = NULL;
}

/****************************************************************************/

#if defined(CONFIG_CMD_IRQ)
void do_irqinfo(cmd_tbl_t * cmdtp, bd_t * bd, int flag, int argc, char * const argv[])
{
	int irq;
	unsigned int pil = get_pil();
	printf("PIL level: %u\n\r", pil);
	printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
	       spurious_irq_cnt, spurious_irq);

	puts("\nInterrupt-Information:\n" "Nr  Routine   Arg       Count\n");

	for (irq = 0; irq < NR_IRQS; irq++) {
		if (irq_handlers[irq].handler != NULL) {
			printf("%02d  %08lx  %08lx  %ld\n", irq,
			       (unsigned int)irq_handlers[irq].handler,
			       (unsigned int)irq_handlers[irq].arg,
			       irq_handlers[irq].count);
		}
	}
}
#endif