aboutsummaryrefslogtreecommitdiffstats
path: root/arch/blackfin/mach-common/interrupt.S
blob: f983ac7ea3520040e64eddba86b6587ad2eddc5b (plain) (blame)
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
/*
 * File:         arch/blackfin/mach-common/interrupt.S
 * Based on:
 * Author:       D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>
 *               Kenneth Albanowski <kjahds@kjahds.com>
 *
 * Created:      ?
 * Description:  Interrupt Entries
 *
 * Modified:
 *               Copyright 2004-2006 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * 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, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <asm/blackfin.h>
#include <asm/mach/irq.h>
#include <linux/linkage.h>
#include <asm/entry.h>
#include <asm/asm-offsets.h>
#include <asm/trace.h>
#include <asm/traps.h>
#include <asm/thread_info.h>

#include <asm/mach-common/context.S>

.extern _ret_from_exception

#ifdef CONFIG_I_ENTRY_L1
.section .l1.text
#else
.text
#endif

.align 4 	/* just in case */

/* Common interrupt entry code.	 First we do CLI, then push
 * RETI, to keep interrupts disabled, but to allow this state to be changed
 * by local_bh_enable.
 * R0 contains the interrupt number, while R1 may contain the value of IPEND,
 * or garbage if IPEND won't be needed by the ISR.  */
__common_int_entry:
	[--sp] = fp;
	[--sp] = usp;

	[--sp] = i0;
	[--sp] = i1;
	[--sp] = i2;
	[--sp] = i3;

	[--sp] = m0;
	[--sp] = m1;
	[--sp] = m2;
	[--sp] = m3;

	[--sp] = l0;
	[--sp] = l1;
	[--sp] = l2;
	[--sp] = l3;

	[--sp] = b0;
	[--sp] = b1;
	[--sp] = b2;
	[--sp] = b3;
	[--sp] = a0.x;
	[--sp] = a0.w;
	[--sp] = a1.x;
	[--sp] = a1.w;

	[--sp] = LC0;
	[--sp] = LC1;
	[--sp] = LT0;
	[--sp] = LT1;
	[--sp] = LB0;
	[--sp] = LB1;

	[--sp] = ASTAT;

	[--sp] = r0;	/* Skip reserved */
	[--sp] = RETS;
	r2 = RETI;
	[--sp] = r2;
	[--sp] = RETX;
	[--sp] = RETN;
	[--sp] = RETE;
	[--sp] = SEQSTAT;
	[--sp] = r1;	/* IPEND - R1 may or may not be set up before jumping here. */

	/* Switch to other method of keeping interrupts disabled.  */
#ifdef CONFIG_DEBUG_HWERR
	r1 = 0x3f;
	sti r1;
#else
	cli r1;
#endif
	[--sp] = RETI;  /* orig_pc */
	/* Clear all L registers.  */
	r1 = 0 (x);
	l0 = r1;
	l1 = r1;
	l2 = r1;
	l3 = r1;
#ifdef CONFIG_FRAME_POINTER
	fp = 0;
#endif

#if ANOMALY_05000283 || ANOMALY_05000315
	cc = r7 == r7;
	p5.h = 0xffc0;
	p5.l = 0x0014;
	if cc jump 1f;
	r7.l = W[p5];
1:
#endif
	r1 =  sp;
	SP += -12;
	call _do_irq;
	SP += 12;
	call _return_from_int;
.Lcommon_restore_context:
	RESTORE_CONTEXT
	rti;

/* interrupt routine for ivhw - 5 */
ENTRY(_evt_ivhw)
	SAVE_ALL_SYS
#ifdef CONFIG_FRAME_POINTER
	fp = 0;
#endif

#if ANOMALY_05000283
	cc = r7 == r7;
	p5.h = 0xffc0;
	p5.l = 0x0014;
	if cc jump 1f;
	r7.l = W[p5];
1:
#endif

#ifdef CONFIG_HARDWARE_PM
	r7 = [sp + PT_SEQSTAT];
	r7 = r7 >>> 0xe;
	r6 = 0x1F;
	r7 = r7 & r6;
	r5 = 0x12;
	cc = r7 == r5;
	if cc jump .Lcall_do_ovf; /* deal with performance counter overflow */
#endif
	# We are going to dump something out, so make sure we print IPEND properly
	p2.l = lo(IPEND);
	p2.h = hi(IPEND);
	r0 = [p2];
	[sp + PT_IPEND] = r0;

	/* set the EXCAUSE to HWERR for trap_c */
	r0 = [sp + PT_SEQSTAT];
	R1.L = LO(VEC_HWERR);
	R1.H = HI(VEC_HWERR);
	R0 = R0 | R1;
	[sp + PT_SEQSTAT] = R0;

	r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
	SP += -12;
	call _trap_c;
	SP += 12;

	call _ret_from_exception;
.Lcommon_restore_all_sys:
	RESTORE_ALL_SYS
	rti;

#ifdef CONFIG_HARDWARE_PM
.Lcall_do_ovf:

	SP += -12;
	call _pm_overflow;
	SP += 12;

	jump .Lcommon_restore_all_sys;
#endif

ENDPROC(_evt_ivhw)

/* Interrupt routine for evt2 (NMI).
 * We don't actually use this, so just return.
 * For inner circle type details, please see:
 * http://docs.blackfin.uclinux.org/doku.php?id=linux:nmi
 */
ENTRY(_evt_nmi)
.weak _evt_nmi
	rtn;
ENDPROC(_evt_nmi)

/* interrupt routine for core timer - 6 */
ENTRY(_evt_timer)
	TIMER_INTERRUPT_ENTRY(EVT_IVTMR_P)

/* interrupt routine for evt7 - 7 */
ENTRY(_evt_evt7)
	INTERRUPT_ENTRY(EVT_IVG7_P)
ENTRY(_evt_evt8)
	INTERRUPT_ENTRY(EVT_IVG8_P)
ENTRY(_evt_evt9)
	INTERRUPT_ENTRY(EVT_IVG9_P)
ENTRY(_evt_evt10)
	INTERRUPT_ENTRY(EVT_IVG10_P)
ENTRY(_evt_evt11)
	INTERRUPT_ENTRY(EVT_IVG11_P)
ENTRY(_evt_evt12)
	INTERRUPT_ENTRY(EVT_IVG12_P)
ENTRY(_evt_evt13)
	INTERRUPT_ENTRY(EVT_IVG13_P)


 /* interrupt routine for system_call - 15 */
ENTRY(_evt_system_call)
	SAVE_CONTEXT_SYSCALL
#ifdef CONFIG_FRAME_POINTER
	fp = 0;
#endif
	call _system_call;
	jump .Lcommon_restore_context;
ENDPROC(_evt_system_call)