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
|
/*
* (C) Copyright 2000-2002 Wolfgang Denk, DENX Software Engineering, wd@denx.de.
* (C) Copyright 2003 Martin Winistoerfer, martinwinistoerfer@gmx.ch.
*
* 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,
*/
/*
* File: interrupt.c
*
* Discription: Contains interrupt routines needed by U-Boot
*
*/
#include <common.h>
#include <command.h>
#include <mpc5xx.h>
#include <asm/processor.h>
#if defined(CONFIG_PATI)
/* PATI uses IRQs for PCI doorbell */
#undef NR_IRQS
#define NR_IRQS 16
#endif
struct interrupt_action {
interrupt_handler_t *handler;
void *arg;
int count;
};
static struct interrupt_action irq_vecs[NR_IRQS];
/*
* Initialise interrupts
*/
int interrupt_init_cpu (ulong *decrementer_count)
{
volatile immap_t *immr = (immap_t *) CFG_IMMR;
int vec;
/* Decrementer used here for status led */
*decrementer_count = get_tbclk () / CFG_HZ;
/* Disable all interrupts */
immr->im_siu_conf.sc_simask = 0;
for (vec=0; vec<NR_IRQS; vec++) {
irq_vecs[vec].handler = NULL;
irq_vecs[vec].arg = NULL;
irq_vecs[vec].count = 0;
}
return (0);
}
/*
* Handle external interrupts
*/
void external_interrupt (struct pt_regs *regs)
{
volatile immap_t *immr = (immap_t *) CFG_IMMR;
int irq;
ulong simask, newmask;
ulong vec, v_bit;
/*
* read the SIVEC register and shift the bits down
* to get the irq number
*/
vec = immr->im_siu_conf.sc_sivec;
irq = vec >> 26;
v_bit = 0x80000000UL >> irq;
/*
* Read Interrupt Mask Register and Mask Interrupts
*/
simask = immr->im_siu_conf.sc_simask;
newmask = simask & (~(0xFFFF0000 >> irq));
immr->im_siu_conf.sc_simask = newmask;
if (!(irq & 0x1)) { /* External Interrupt ? */
ulong siel;
/*
* Read Interrupt Edge/Level Register
*/
siel = immr->im_siu_conf.sc_siel;
if (siel & v_bit) { /* edge triggered interrupt ? */
/*
* Rewrite SIPEND Register to clear interrupt
*/
immr->im_siu_conf.sc_sipend = v_bit;
}
}
if (irq_vecs[irq].handler != NULL) {
irq_vecs[irq].handler (irq_vecs[irq].arg);
} else {
printf ("\nBogus External Interrupt IRQ %d Vector %ld\n",
irq, vec);
/* turn off the bogus interrupt to avoid it from now */
simask &= ~v_bit;
}
/*
* Re-Enable old Interrupt Mask
*/
immr->im_siu_conf.sc_simask = simask;
}
/*
* Install and free an interrupt handler
*/
void irq_install_handler (int vec, interrupt_handler_t * handler,
void *arg)
{
volatile immap_t *immr = (immap_t *) CFG_IMMR;
/* SIU interrupt */
if (irq_vecs[vec].handler != NULL) {
printf ("SIU interrupt %d 0x%x\n",
vec,
(uint) handler);
}
irq_vecs[vec].handler = handler;
irq_vecs[vec].arg = arg;
immr->im_siu_conf.sc_simask |= 1 << (31 - vec);
#if 0
printf ("Install SIU interrupt for vector %d ==> %p\n",
vec, handler);
#endif
}
void irq_free_handler (int vec)
{
volatile immap_t *immr = (immap_t *) CFG_IMMR;
/* SIU interrupt */
#if 0
printf ("Free CPM interrupt for vector %d\n",
vec);
#endif
immr->im_siu_conf.sc_simask &= ~(1 << (31 - vec));
irq_vecs[vec].handler = NULL;
irq_vecs[vec].arg = NULL;
}
/*
* Timer interrupt - gets called when bit 0 of DEC changes from
* 0. Decrementer is enabled with bit TBE in TBSCR.
*/
void timer_interrupt_cpu (struct pt_regs *regs)
{
volatile immap_t *immr = (immap_t *) CFG_IMMR;
#if 0
printf ("*** Timer Interrupt *** ");
#endif
/* Reset Timer Status Bit and Timers Interrupt Status */
immr->im_clkrstk.cark_plprcrk = KAPWR_KEY;
__asm__ ("nop");
immr->im_clkrst.car_plprcr |= PLPRCR_TEXPS | PLPRCR_TMIST;
return;
}
#if defined(CONFIG_CMD_IRQ)
/*******************************************************************************
*
* irqinfo - print information about IRQs
*
*/
int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
int vec;
printf ("\nInterrupt-Information:\n");
printf ("Nr Routine Arg Count\n");
for (vec=0; vec<NR_IRQS; vec++) {
if (irq_vecs[vec].handler != NULL) {
printf ("%02d %08lx %08lx %d\n",
vec,
(ulong)irq_vecs[vec].handler,
(ulong)irq_vecs[vec].arg,
irq_vecs[vec].count);
}
}
return 0;
}
#endif
|
