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
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 by Karl Kurbjun
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "kernel.h"
#include "system.h"
#include "panic.h"
#include "uart-target.h"
#include "spi.h"
#define default_interrupt(name) \
extern __attribute__((weak,alias("UIRQ"))) void name (void)
default_interrupt(TIMER0);
default_interrupt(TIMER1);
default_interrupt(TIMER2);
default_interrupt(TIMER3);
default_interrupt(CCD_VD0);
default_interrupt(CCD_VD1);
default_interrupt(CCD_WEN);
default_interrupt(VENC);
default_interrupt(SERIAL0);
default_interrupt(SERIAL1);
default_interrupt(EXT_HOST);
default_interrupt(DSPHINT);
default_interrupt(UART0);
default_interrupt(UART1);
default_interrupt(USB_DMA);
default_interrupt(USB_CORE);
default_interrupt(VLYNQ);
default_interrupt(MTC0);
default_interrupt(MTC1);
default_interrupt(SD_MMC);
default_interrupt(SDIO_MS);
default_interrupt(GIO0);
default_interrupt(GIO1);
default_interrupt(GIO2);
default_interrupt(GIO3);
default_interrupt(GIO4);
default_interrupt(GIO5);
default_interrupt(GIO6);
default_interrupt(GIO7);
default_interrupt(GIO8);
default_interrupt(GIO9);
default_interrupt(GIO10);
default_interrupt(GIO11);
default_interrupt(GIO12);
default_interrupt(GIO13);
default_interrupt(GIO14);
default_interrupt(GIO15);
default_interrupt(PREVIEW0);
default_interrupt(PREVIEW1);
default_interrupt(WATCHDOG);
default_interrupt(I2C);
default_interrupt(CLKC);
default_interrupt(ICE);
default_interrupt(ARMCOM_RX);
default_interrupt(ARMCOM_TX);
default_interrupt(RESERVED);
static void (* const irqvector[])(void) =
{
TIMER0,TIMER1,TIMER2,TIMER3,CCD_VD0,CCD_VD1,
CCD_WEN,VENC,SERIAL0,SERIAL1,EXT_HOST,DSPHINT,
UART0,UART1,USB_DMA,USB_CORE,VLYNQ,MTC0,MTC1,
SD_MMC,SDIO_MS,GIO0,GIO1,GIO2,GIO3,GIO4,GIO5,
GIO6,GIO7,GIO8,GIO9,GIO10,GIO11,GIO12,GIO13,
GIO14,GIO15,PREVIEW0,PREVIEW1,WATCHDOG,I2C,CLKC,
ICE,ARMCOM_RX,ARMCOM_TX,RESERVED
};
static const char * const irqname[] =
{
"TIMER0","TIMER1","TIMER2","TIMER3","CCD_VD0","CCD_VD1",
"CCD_WEN","VENC","SERIAL0","SERIAL1","EXT_HOST","DSPHINT",
"UART0","UART1","USB_DMA","USB_CORE","VLYNQ","MTC0","MTC1",
"SD_MMC","SDIO_MS","GIO0","GIO1","GIO2","GIO3","GIO4","GIO5",
"GIO6","GIO7","GIO8","GIO9","GIO10","GIO11","GIO12","GIO13",
"GIO14","GIO15","PREVIEW0","PREVIEW1","WATCHDOG","I2C","CLKC",
"ICE","ARMCOM_RX","ARMCOM_TX","RESERVED"
};
static void UIRQ(void)
{
unsigned int offset = (IO_INTC_IRQENTRY0>>2)-1;
panicf("Unhandled IRQ %02X: %s", offset, irqname[offset]);
}
void irq_handler(void) __attribute__((interrupt ("IRQ"), naked));
void irq_handler(void)
{
/*
* Based on: linux/arch/arm/kernel/entry-armv.S and system-meg-fx.c
*/
asm volatile( "stmfd sp!, {r0-r7, ip, lr} \n" /* Store context */
"sub sp, sp, #8 \n"); /* Reserve stack */
irqvector[(IO_INTC_IRQENTRY0>>2)-1]();
asm volatile( "add sp, sp, #8 \n" /* Cleanup stack */
"ldmfd sp!, {r0-r7, ip, lr} \n" /* Restore context */
"subs pc, lr, #4 \n"); /* Return from FIQ */
}
void fiq_handler(void) __attribute__((interrupt ("FIQ"), naked));
void fiq_handler(void)
{
/*
* Based on: linux/arch/arm/kernel/entry-armv.S and system-meg-fx.c
*/
asm volatile (
"sub lr, lr, #4 \r\n"
"stmfd sp!, {r0-r3, ip, lr} \r\n"
"mov r0, #0x00030000 \r\n"
"ldr r0, [r0, #0x518] \r\n"
"ldr r1, =irqvector \r\n"
"ldr r1, [r1, r0, lsl #2] \r\n"
"mov lr, pc \r\n"
"bx r1 \r\n"
"ldmfd sp!, {r0-r3, ip, pc}^ \r\n"
);
}
void system_reboot(void)
{
}
void enable_interrupts (void)
{
asm volatile ("msr cpsr_c, #0x13" );
}
void system_init(void)
{
/* taken from linux/arch/arm/mach-itdm320-20/irq.c */
/* Clearing all FIQs and IRQs. */
IO_INTC_IRQ0 = 0xFFFF;
IO_INTC_IRQ1 = 0xFFFF;
IO_INTC_IRQ2 = 0xFFFF;
IO_INTC_FIQ0 = 0xFFFF;
IO_INTC_FIQ1 = 0xFFFF;
IO_INTC_FIQ2 = 0xFFFF;
/* Masking all Interrupts. */
IO_INTC_EINT0 = 0;
IO_INTC_EINT1 = 0;
IO_INTC_EINT2 = 0;
/* Setting INTC to all IRQs. */
IO_INTC_FISEL0 = 0;
IO_INTC_FISEL1 = 0;
IO_INTC_FISEL2 = 0;
IO_INTC_ENTRY_TBA0 =
IO_INTC_ENTRY_TBA1 = 0;
/* set GIO26 (reset pin) to output and low */
IO_GIO_BITCLR1=(1<<10);
IO_GIO_DIR1&=~(1<<10);
enable_interrupts();
uart_init();
spi_init();
}
int system_memory_guard(int newmode)
{
(void)newmode;
return 0;
}
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
void set_cpu_frequency(long frequency)
{
if (frequency == CPUFREQ_MAX)
{
asm volatile("mov r0, #0\n"
"mrc p15, 0, r0, c1, c0, 0\n"
"orr r0, r0, #3<<30\n" /* set to Asynchronous mode*/
"mcr p15, 0, r0, c1, c0, 0" : : : "r0");
FREQ = CPUFREQ_MAX;
}
else
{
asm volatile("mov r0, #0\n"
"mrc p15, 0, r0, c1, c0, 0\n"
"bic r0, r0, #3<<30\n" /* set to FastBus mode*/
"mcr p15, 0, r0, c1, c0, 0" : : : "r0");
FREQ = CPUFREQ_NORMAL;
}
}
#endif
|
