diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/mips/jazz/int-handler.S |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/mips/jazz/int-handler.S')
-rw-r--r-- | arch/mips/jazz/int-handler.S | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/arch/mips/jazz/int-handler.S b/arch/mips/jazz/int-handler.S new file mode 100644 index 000000000000..4dbcf91db884 --- /dev/null +++ b/arch/mips/jazz/int-handler.S | |||
@@ -0,0 +1,282 @@ | |||
1 | /* | ||
2 | * This file is subject to the terms and conditions of the GNU General Public | ||
3 | * License. See the file "COPYING" in the main directory of this archive | ||
4 | * for more details. | ||
5 | * | ||
6 | * Copyright (C) 1995, 1996, 1997, 1998 by Ralf Baechle and Andreas Busse | ||
7 | * | ||
8 | * Jazz family specific interrupt stuff | ||
9 | * | ||
10 | * To do: On Jazz machines we remap some non-ISA interrupts to ISA | ||
11 | * interrupts. These interrupts should use their own vectors. | ||
12 | * Squeeze the last cycles out of the handlers. Only a dead | ||
13 | * cycle is a good cycle. | ||
14 | */ | ||
15 | #include <asm/asm.h> | ||
16 | #include <asm/mipsregs.h> | ||
17 | #include <asm/jazz.h> | ||
18 | #include <asm/regdef.h> | ||
19 | #include <asm/stackframe.h> | ||
20 | |||
21 | /* | ||
22 | * jazz_handle_int: Interrupt handler for the ACER Pica-61 boards | ||
23 | */ | ||
24 | .set noreorder | ||
25 | |||
26 | NESTED(jazz_handle_int, PT_SIZE, ra) | ||
27 | .set noat | ||
28 | SAVE_ALL | ||
29 | CLI | ||
30 | .set at | ||
31 | |||
32 | /* | ||
33 | * Get pending interrupts | ||
34 | */ | ||
35 | mfc0 t0,CP0_CAUSE # get pending interrupts | ||
36 | mfc0 t1,CP0_STATUS # get enabled interrupts | ||
37 | and t0,t1 # isolate allowed ones | ||
38 | andi t0,0xff00 # isolate pending bits | ||
39 | beqz t0,3f | ||
40 | sll t0,16 # delay slot | ||
41 | |||
42 | /* | ||
43 | * Find irq with highest priority | ||
44 | * FIXME: This is slow - use binary search | ||
45 | */ | ||
46 | la t1,ll_vectors | ||
47 | 1: bltz t0,2f # found pending irq | ||
48 | sll t0,1 | ||
49 | b 1b | ||
50 | subu t1,PTRSIZE # delay slot | ||
51 | |||
52 | /* | ||
53 | * Do the low-level stuff | ||
54 | */ | ||
55 | 2: lw t0,(t1) | ||
56 | jr t0 | ||
57 | nop # delay slot | ||
58 | END(jazz_handle_int) | ||
59 | |||
60 | ll_sw0: li s1,~IE_SW0 | ||
61 | mfc0 t0,CP0_CAUSE | ||
62 | and t0,s1 | ||
63 | mtc0 t0,CP0_CAUSE | ||
64 | PANIC("Unimplemented sw0 handler") | ||
65 | |||
66 | ll_sw1: li s1,~IE_SW1 | ||
67 | mfc0 t0,CP0_CAUSE | ||
68 | and t0,s1 | ||
69 | mtc0 t0,CP0_CAUSE | ||
70 | PANIC("Unimplemented sw1 handler") | ||
71 | |||
72 | ll_local_dma: li s1,~IE_IRQ0 | ||
73 | PANIC("Unimplemented local_dma handler") | ||
74 | |||
75 | ll_local_dev: lbu t0,JAZZ_IO_IRQ_SOURCE | ||
76 | #if PTRSIZE == 8 /* True 64 bit kernel */ | ||
77 | dsll t0,1 | ||
78 | #endif | ||
79 | .set reorder | ||
80 | LONG_L t0,local_vector(t0) | ||
81 | jr t0 | ||
82 | .set noreorder | ||
83 | |||
84 | /* | ||
85 | * The braindead PICA hardware gives us no way to distinguish if we really | ||
86 | * received interrupt 7 from the (E)ISA bus or if we just received an | ||
87 | * interrupt with no findable cause. This sometimes happens with braindead | ||
88 | * cards. Oh well - for all the Jazz boxes slots are more or less just | ||
89 | * whistles and bells and we're aware of the problem. | ||
90 | */ | ||
91 | ll_isa_irq: lw a0, JAZZ_EISA_IRQ_ACK | ||
92 | |||
93 | jal do_IRQ | ||
94 | move a1,sp | ||
95 | |||
96 | j ret_from_irq | ||
97 | nop | ||
98 | |||
99 | /* | ||
100 | * Hmm... This is not just a plain PC clone so the question is | ||
101 | * which devices on Jazz machines can generate an (E)ISA NMI? | ||
102 | * (Writing to nonexistent memory?) | ||
103 | */ | ||
104 | ll_isa_nmi: li s1,~IE_IRQ3 | ||
105 | PANIC("Unimplemented isa_nmi handler") | ||
106 | |||
107 | /* | ||
108 | * Timer IRQ - remapped to be more similar to an IBM compatible. | ||
109 | * | ||
110 | * The timer interrupt is handled specially to ensure that the jiffies | ||
111 | * variable is updated at all times. Specifically, the timer interrupt is | ||
112 | * just like the complete handlers except that it is invoked with interrupts | ||
113 | * disabled and should never re-enable them. If other interrupts were | ||
114 | * allowed to be processed while the timer interrupt is active, then the | ||
115 | * other interrupts would have to avoid using the jiffies variable for delay | ||
116 | * and interval timing operations to avoid hanging the system. | ||
117 | */ | ||
118 | ll_timer: lw zero,JAZZ_TIMER_REGISTER # timer irq cleared on read | ||
119 | li s1,~IE_IRQ4 | ||
120 | |||
121 | li a0, JAZZ_TIMER_IRQ | ||
122 | jal do_IRQ | ||
123 | move a1,sp | ||
124 | |||
125 | mfc0 t0,CP0_STATUS # disable interrupts again | ||
126 | ori t0,1 | ||
127 | xori t0,1 | ||
128 | mtc0 t0,CP0_STATUS | ||
129 | |||
130 | j ret_from_irq | ||
131 | nop | ||
132 | |||
133 | /* | ||
134 | * CPU count/compare IRQ (unused) | ||
135 | */ | ||
136 | ll_count: j ret_from_irq | ||
137 | mtc0 zero,CP0_COMPARE | ||
138 | |||
139 | #if 0 | ||
140 | /* | ||
141 | * Call the handler for the interrupt | ||
142 | * (Currently unused) | ||
143 | */ | ||
144 | call_real: /* | ||
145 | * temporarily disable interrupt | ||
146 | */ | ||
147 | mfc0 t2,CP0_STATUS | ||
148 | and t2,s1 | ||
149 | mtc0 t2,CP0_STATUS | ||
150 | nor s1,zero,s1 | ||
151 | jal do_IRQ | ||
152 | |||
153 | /* | ||
154 | * reenable interrupt | ||
155 | */ | ||
156 | mfc0 t2,CP0_STATUS | ||
157 | or t2,s1 | ||
158 | mtc0 t2,CP0_STATUS | ||
159 | j ret_from_irq | ||
160 | #endif | ||
161 | |||
162 | .data | ||
163 | PTR ll_sw0 # SW0 | ||
164 | PTR ll_sw1 # SW1 | ||
165 | PTR ll_local_dma # Local DMA | ||
166 | PTR ll_local_dev # Local devices | ||
167 | PTR ll_isa_irq # ISA IRQ | ||
168 | PTR ll_isa_nmi # ISA NMI | ||
169 | PTR ll_timer # Timer | ||
170 | ll_vectors: PTR ll_count # Count/Compare IRQ | ||
171 | |||
172 | /* | ||
173 | * Interrupt handlers for local devices. | ||
174 | */ | ||
175 | .text | ||
176 | .set reorder | ||
177 | loc_no_irq: PANIC("Unimplemented loc_no_irq handler") | ||
178 | /* | ||
179 | * Parallel port IRQ | ||
180 | */ | ||
181 | loc_parallel: li s1,~JAZZ_IE_PARALLEL | ||
182 | li a0,JAZZ_PARALLEL_IRQ | ||
183 | b loc_call | ||
184 | |||
185 | /* | ||
186 | * Floppy IRQ | ||
187 | */ | ||
188 | loc_floppy: li s1,~JAZZ_IE_FLOPPY | ||
189 | li a0,JAZZ_FLOPPY_IRQ | ||
190 | b loc_call | ||
191 | |||
192 | /* | ||
193 | * Sound IRQ | ||
194 | */ | ||
195 | loc_sound: PANIC("Unimplemented loc_sound handler") | ||
196 | loc_video: PANIC("Unimplemented loc_video handler") | ||
197 | |||
198 | /* | ||
199 | * Ethernet interrupt handler | ||
200 | */ | ||
201 | loc_ethernet: li s1,~JAZZ_IE_ETHERNET | ||
202 | li a0,JAZZ_ETHERNET_IRQ | ||
203 | b loc_call | ||
204 | |||
205 | /* | ||
206 | * SCSI interrupt handler | ||
207 | */ | ||
208 | loc_scsi: li s1,~JAZZ_IE_SCSI | ||
209 | li a0,JAZZ_SCSI_IRQ | ||
210 | b loc_call | ||
211 | |||
212 | /* | ||
213 | * Keyboard interrupt handler | ||
214 | */ | ||
215 | loc_keyboard: li s1,~JAZZ_IE_KEYBOARD | ||
216 | li a0,JAZZ_KEYBOARD_IRQ | ||
217 | b loc_call | ||
218 | |||
219 | /* | ||
220 | * Mouse interrupt handler | ||
221 | */ | ||
222 | loc_mouse: li s1,~JAZZ_IE_MOUSE | ||
223 | li a0,JAZZ_MOUSE_IRQ | ||
224 | b loc_call | ||
225 | |||
226 | /* | ||
227 | * Serial port 1 IRQ | ||
228 | */ | ||
229 | loc_serial1: li s1,~JAZZ_IE_SERIAL1 | ||
230 | li a0,JAZZ_SERIAL1_IRQ | ||
231 | b loc_call | ||
232 | |||
233 | /* | ||
234 | * Serial port 2 IRQ | ||
235 | */ | ||
236 | loc_serial2: li s1,~JAZZ_IE_SERIAL2 | ||
237 | li a0,JAZZ_SERIAL2_IRQ | ||
238 | b loc_call | ||
239 | |||
240 | /* | ||
241 | * Call the interrupt handler for an interrupt generated by a | ||
242 | * local device. | ||
243 | */ | ||
244 | loc_call: /* | ||
245 | * Temporarily disable interrupt source | ||
246 | */ | ||
247 | lhu t2,JAZZ_IO_IRQ_ENABLE | ||
248 | and t2,s1 | ||
249 | sh t2,JAZZ_IO_IRQ_ENABLE | ||
250 | |||
251 | nor s1,zero,s1 | ||
252 | jal do_IRQ | ||
253 | |||
254 | /* | ||
255 | * Reenable interrupt | ||
256 | */ | ||
257 | lhu t2,JAZZ_IO_IRQ_ENABLE | ||
258 | or t2,s1 | ||
259 | sh t2,JAZZ_IO_IRQ_ENABLE | ||
260 | |||
261 | j ret_from_irq | ||
262 | |||
263 | /* | ||
264 | * "Jump extender" to reach spurious_interrupt | ||
265 | */ | ||
266 | 3: j spurious_interrupt | ||
267 | |||
268 | /* | ||
269 | * Vectors for interrupts generated by local devices | ||
270 | */ | ||
271 | .data | ||
272 | local_vector: PTR loc_no_irq | ||
273 | PTR loc_parallel | ||
274 | PTR loc_floppy | ||
275 | PTR loc_sound | ||
276 | PTR loc_video | ||
277 | PTR loc_ethernet | ||
278 | PTR loc_scsi | ||
279 | PTR loc_keyboard | ||
280 | PTR loc_mouse | ||
281 | PTR loc_serial1 | ||
282 | PTR loc_serial2 | ||