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
|
/*
* (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
*/
/*
* interrupts.c - just enough support for the decrementer/timer
*/
#include <common.h>
#include <mpc8xx.h>
#include <mpc8xx_irq.h>
#include <asm/processor.h>
#include <commproc.h>
#include <command.h>
/****************************************************************************/
unsigned decrementer_count; /* count value for 1e6/HZ microseconds */
/****************************************************************************/
static __inline__ unsigned long
get_msr(void)
{
unsigned long msr;
asm volatile("mfmsr %0" : "=r" (msr) :);
return msr;
}
static __inline__ void
set_msr(unsigned long msr)
{
asm volatile("mtmsr %0" : : "r" (msr));
}
static __inline__ unsigned long
get_dec(void)
{
unsigned long val;
asm volatile("mfdec %0" : "=r" (val) :);
return val;
}
static __inline__ void
set_dec(unsigned long val)
{
asm volatile("mtdec %0" : : "r" (val));
}
void
enable_interrupts(void)
{
set_msr (get_msr() | MSR_EE);
}
/* returns flag if MSR_EE was set before */
int
disable_interrupts(void)
{
ulong msr = get_msr();
set_msr (msr & ~MSR_EE);
return ((msr & MSR_EE) != 0);
}
/****************************************************************************/
int interrupt_init(void)
{
#ifdef DEBUG
printf("interrupt_init: GT main cause reg: %08x:%08x\n",
GTREGREAD(LOW_INTERRUPT_CAUSE_REGISTER),
GTREGREAD(HIGH_INTERRUPT_CAUSE_REGISTER));
printf("interrupt_init: ethernet cause regs: %08x %08x %08x\n",
GTREGREAD(ETHERNET0_INTERRUPT_CAUSE_REGISTER),
GTREGREAD(ETHERNET1_INTERRUPT_CAUSE_REGISTER),
GTREGREAD(ETHERNET2_INTERRUPT_CAUSE_REGISTER));
printf("interrupt_init: ethernet mask regs: %08x %08x %08x\n",
GTREGREAD(ETHERNET0_INTERRUPT_MASK_REGISTER),
GTREGREAD(ETHERNET1_INTERRUPT_MASK_REGISTER),
GTREGREAD(ETHERNET2_INTERRUPT_MASK_REGISTER));
puts("interrupt_init: setting decrementer_count\n");
#endif
decrementer_count = get_tbclk() / CFG_HZ;
#ifdef DEBUG
puts("interrupt_init: setting actual decremter\n");
#endif
set_dec (get_tbclk() / CFG_HZ);
#ifdef DEBUG
printf("interrupt_init: enabling interrupts (msr = %08lx)\n",
get_msr());
#endif
set_msr (get_msr() | MSR_EE);
#ifdef DEBUG
printf("interrupt_init: done. (msr = %08lx)\n", get_msr());
#endif
return (0);
}
/****************************************************************************/
/*
* Handle external interrupts
*/
void
external_interrupt(struct pt_regs *regs)
{
puts("external_interrupt (oops!)\n");
}
volatile ulong timestamp = 0;
/*
* timer_interrupt - gets called when the decrementer overflows,
* with interrupts disabled.
* Trivial implementation - no need to be really accurate.
*/
void
timer_interrupt(struct pt_regs *regs)
{
set_dec(decrementer_count);
timestamp++;
#if defined(CONFIG_WATCHDOG)
if ((timestamp % (CFG_HZ / 2)) == 0) {
#if defined(CONFIG_PCIPPC2)
extern void pcippc2_wdt_reset (void);
pcippc2_wdt_reset();
#endif
}
#endif /* CONFIG_WATCHDOG */
}
/****************************************************************************/
void
reset_timer(void)
{
timestamp = 0;
}
ulong
get_timer(ulong base)
{
return (timestamp - base);
}
void
set_timer(ulong t)
{
timestamp = t;
}
/****************************************************************************/
/*
* Install and free a interrupt handler.
*/
void
irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
{
}
void
irq_free_handler(int vec)
{
}
/****************************************************************************/
void
do_irqinfo(cmd_tbl_t *cmdtp, bd_t *bd, int flag, int argc, char *argv[])
{
puts("IRQ related functions are unimplemented currently.\n");
}
|
