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
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
|
/*
* BRIEF MODULE DESCRIPTION
* ITE 8172G interrupt/setup routines.
*
* Copyright 2000,2001 MontaVista Software Inc.
* Author: MontaVista Software, Inc.
* ppopov@mvista.com or source@mvista.com
*
* Part of this file was derived from Carsten Langgaard's
* arch/mips/mips-boards/atlas/atlas_int.c.
*
* Carsten Langgaard, carstenl@mips.com
* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
*
* 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* 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.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/kernel_stat.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/timex.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/serial_reg.h>
#include <linux/bitops.h>
#include <asm/bootinfo.h>
#include <asm/io.h>
#include <asm/mipsregs.h>
#include <asm/system.h>
#include <asm/it8172/it8172.h>
#include <asm/it8172/it8172_int.h>
#include <asm/it8172/it8172_dbg.h>
/* revisit */
#define EXT_IRQ0_TO_IP 2 /* IP 2 */
#define EXT_IRQ5_TO_IP 7 /* IP 7 */
#define ALLINTS_NOTIMER (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4)
void disable_it8172_irq(unsigned int irq_nr);
void enable_it8172_irq(unsigned int irq_nr);
extern void set_debug_traps(void);
extern void mips_timer_interrupt(int irq, struct pt_regs *regs);
extern asmlinkage void it8172_IRQ(void);
struct it8172_intc_regs volatile *it8172_hw0_icregs =
(struct it8172_intc_regs volatile *)(KSEG1ADDR(IT8172_PCI_IO_BASE + IT_INTC_BASE));
static void disable_it8172_irq(unsigned int irq_nr)
{
if ( (irq_nr >= IT8172_LPC_IRQ_BASE) && (irq_nr <= IT8172_SERIRQ_15)) {
/* LPC interrupt */
it8172_hw0_icregs->lpc_mask |=
(1 << (irq_nr - IT8172_LPC_IRQ_BASE));
} else if ( (irq_nr >= IT8172_LB_IRQ_BASE) && (irq_nr <= IT8172_IOCHK_IRQ)) {
/* Local Bus interrupt */
it8172_hw0_icregs->lb_mask |=
(1 << (irq_nr - IT8172_LB_IRQ_BASE));
} else if ( (irq_nr >= IT8172_PCI_DEV_IRQ_BASE) && (irq_nr <= IT8172_DMA_IRQ)) {
/* PCI and other interrupts */
it8172_hw0_icregs->pci_mask |=
(1 << (irq_nr - IT8172_PCI_DEV_IRQ_BASE));
} else if ( (irq_nr >= IT8172_NMI_IRQ_BASE) && (irq_nr <= IT8172_POWER_NMI_IRQ)) {
/* NMI interrupts */
it8172_hw0_icregs->nmi_mask |=
(1 << (irq_nr - IT8172_NMI_IRQ_BASE));
} else {
panic("disable_it8172_irq: bad irq %d", irq_nr);
}
}
static void enable_it8172_irq(unsigned int irq_nr)
{
if ( (irq_nr >= IT8172_LPC_IRQ_BASE) && (irq_nr <= IT8172_SERIRQ_15)) {
/* LPC interrupt */
it8172_hw0_icregs->lpc_mask &=
~(1 << (irq_nr - IT8172_LPC_IRQ_BASE));
}
else if ( (irq_nr >= IT8172_LB_IRQ_BASE) && (irq_nr <= IT8172_IOCHK_IRQ)) {
/* Local Bus interrupt */
it8172_hw0_icregs->lb_mask &=
~(1 << (irq_nr - IT8172_LB_IRQ_BASE));
}
else if ( (irq_nr >= IT8172_PCI_DEV_IRQ_BASE) && (irq_nr <= IT8172_DMA_IRQ)) {
/* PCI and other interrupts */
it8172_hw0_icregs->pci_mask &=
~(1 << (irq_nr - IT8172_PCI_DEV_IRQ_BASE));
}
else if ( (irq_nr >= IT8172_NMI_IRQ_BASE) && (irq_nr <= IT8172_POWER_NMI_IRQ)) {
/* NMI interrupts */
it8172_hw0_icregs->nmi_mask &=
~(1 << (irq_nr - IT8172_NMI_IRQ_BASE));
}
else {
panic("enable_it8172_irq: bad irq %d", irq_nr);
}
}
static unsigned int startup_ite_irq(unsigned int irq)
{
enable_it8172_irq(irq);
return 0;
}
#define shutdown_ite_irq disable_it8172_irq
#define mask_and_ack_ite_irq disable_it8172_irq
static void end_ite_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
enable_it8172_irq(irq);
}
static struct hw_interrupt_type it8172_irq_type = {
.typename = "ITE8172",
.startup = startup_ite_irq,
.shutdown = shutdown_ite_irq,
.enable = enable_it8172_irq,
.disable = disable_it8172_irq,
.ack = mask_and_ack_ite_irq,
.end = end_ite_irq,
};
static void enable_none(unsigned int irq) { }
static unsigned int startup_none(unsigned int irq) { return 0; }
static void disable_none(unsigned int irq) { }
static void ack_none(unsigned int irq) { }
/* startup is the same as "enable", shutdown is same as "disable" */
#define shutdown_none disable_none
#define end_none enable_none
static struct hw_interrupt_type cp0_irq_type = {
.typename = "CP0 Count",
.startup = startup_none,
.shutdown = shutdown_none,
.enable = enable_none,
.disable = disable_none,
.ack = ack_none,
.end = end_none
};
void enable_cpu_timer(void)
{
unsigned long flags;
local_irq_save(flags);
set_c0_status(0x100 << EXT_IRQ5_TO_IP);
local_irq_restore(flags);
}
void __init arch_init_irq(void)
{
int i;
unsigned long flags;
memset(irq_desc, 0, sizeof(irq_desc));
set_except_vector(0, it8172_IRQ);
/* mask all interrupts */
it8172_hw0_icregs->lb_mask = 0xffff;
it8172_hw0_icregs->lpc_mask = 0xffff;
it8172_hw0_icregs->pci_mask = 0xffff;
it8172_hw0_icregs->nmi_mask = 0xffff;
/* make all interrupts level triggered */
it8172_hw0_icregs->lb_trigger = 0;
it8172_hw0_icregs->lpc_trigger = 0;
it8172_hw0_icregs->pci_trigger = 0;
it8172_hw0_icregs->nmi_trigger = 0;
/* active level setting */
/* uart, keyboard, and mouse are active high */
it8172_hw0_icregs->lpc_level = (0x10 | 0x2 | 0x1000);
it8172_hw0_icregs->lb_level |= 0x20;
/* keyboard and mouse are edge triggered */
it8172_hw0_icregs->lpc_trigger |= (0x2 | 0x1000);
#if 0
// Enable this piece of code to make internal USB interrupt
// edge triggered.
it8172_hw0_icregs->pci_trigger |=
(1 << (IT8172_USB_IRQ - IT8172_PCI_DEV_IRQ_BASE));
it8172_hw0_icregs->pci_level &=
~(1 << (IT8172_USB_IRQ - IT8172_PCI_DEV_IRQ_BASE));
#endif
for (i = 0; i <= IT8172_LAST_IRQ; i++) {
irq_desc[i].handler = &it8172_irq_type;
spin_lock_init(&irq_desc[i].lock);
}
irq_desc[MIPS_CPU_TIMER_IRQ].handler = &cp0_irq_type;
set_c0_status(ALLINTS_NOTIMER);
}
void mips_spurious_interrupt(struct pt_regs *regs)
{
#if 1
return;
#else
unsigned long status, cause;
printk("got spurious interrupt\n");
status = read_c0_status();
cause = read_c0_cause();
printk("status %x cause %x\n", status, cause);
printk("epc %x badvaddr %x \n", regs->cp0_epc, regs->cp0_badvaddr);
#endif
}
void it8172_hw0_irqdispatch(struct pt_regs *regs)
{
int irq;
unsigned short intstatus = 0, status = 0;
intstatus = it8172_hw0_icregs->intstatus;
if (intstatus & 0x8) {
panic("Got NMI interrupt");
} else if (intstatus & 0x4) {
/* PCI interrupt */
irq = 0;
status |= it8172_hw0_icregs->pci_req;
while (!(status & 0x1)) {
irq++;
status >>= 1;
}
irq += IT8172_PCI_DEV_IRQ_BASE;
} else if (intstatus & 0x1) {
/* Local Bus interrupt */
irq = 0;
status |= it8172_hw0_icregs->lb_req;
while (!(status & 0x1)) {
irq++;
status >>= 1;
}
irq += IT8172_LB_IRQ_BASE;
} else if (intstatus & 0x2) {
/* LPC interrupt */
/* Since some lpc interrupts are edge triggered,
* we could lose an interrupt this way because
* we acknowledge all ints at onces. Revisit.
*/
status |= it8172_hw0_icregs->lpc_req;
it8172_hw0_icregs->lpc_req = 0; /* acknowledge ints */
irq = 0;
while (!(status & 0x1)) {
irq++;
status >>= 1;
}
irq += IT8172_LPC_IRQ_BASE;
} else
return;
do_IRQ(irq, regs);
}
void show_pending_irqs(void)
{
fputs("intstatus: ");
put32(it8172_hw0_icregs->intstatus);
puts("");
fputs("pci_req: ");
put32(it8172_hw0_icregs->pci_req);
puts("");
fputs("lb_req: ");
put32(it8172_hw0_icregs->lb_req);
puts("");
fputs("lpc_req: ");
put32(it8172_hw0_icregs->lpc_req);
puts("");
}
|
