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authorRalf Baechle <ralf@linux-mips.org>2006-04-03 12:56:36 -0400
committerRalf Baechle <ralf@linux-mips.org>2006-04-18 22:14:21 -0400
commite4ac58afdfac792c0583af30dbd9eae53e24c78b (patch)
tree7517bef2c515fc630e4d3d238867b91cde96f558 /arch/mips/jazz
parentd35d473c25d43d7db3e5e18b66d558d2a631cca8 (diff)
[MIPS] Rewrite all the assembler interrupt handlers to C.
Saves like 1,600 lines of code, is way easier to debug, compilers frequently do a better job than the cut and paste type of handlers many boards had. And finally having all the stuff done in a single place also means alot of bug potencial for the MT ASE is gone. The only surviving handler in assembler is the DECstation one; I hope Maciej will rewrite it. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/jazz')
-rw-r--r--arch/mips/jazz/Makefile2
-rw-r--r--arch/mips/jazz/int-handler.S283
-rw-r--r--arch/mips/jazz/irq.c78
3 files changed, 75 insertions, 288 deletions
diff --git a/arch/mips/jazz/Makefile b/arch/mips/jazz/Makefile
index 85749246a671..02bd39add891 100644
--- a/arch/mips/jazz/Makefile
+++ b/arch/mips/jazz/Makefile
@@ -2,6 +2,6 @@
2# Makefile for the Jazz family specific parts of the kernel 2# Makefile for the Jazz family specific parts of the kernel
3# 3#
4 4
5obj-y := int-handler.o irq.o jazzdma.o reset.o setup.o 5obj-y := irq.o jazzdma.o reset.o setup.o
6 6
7EXTRA_AFLAGS := $(CFLAGS) 7EXTRA_AFLAGS := $(CFLAGS)
diff --git a/arch/mips/jazz/int-handler.S b/arch/mips/jazz/int-handler.S
deleted file mode 100644
index e35f5fcd3f90..000000000000
--- a/arch/mips/jazz/int-handler.S
+++ /dev/null
@@ -1,283 +0,0 @@
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
471: 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 */
552: lw t0,(t1)
56 jr t0
57 nop # delay slot
58 END(jazz_handle_int)
59
60ll_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
66ll_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
72ll_local_dma: li s1,~IE_IRQ0
73 PANIC("Unimplemented local_dma handler")
74
75ll_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 */
91ll_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 */
104ll_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 */
118ll_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 */
136ll_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 */
144call_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
170ll_vectors: PTR ll_count # Count/Compare IRQ
171
172 /*
173 * Interrupt handlers for local devices.
174 */
175 .text
176 .set reorder
177loc_no_irq: PANIC("Unimplemented loc_no_irq handler")
178/*
179 * Parallel port IRQ
180 */
181loc_parallel: li s1,~JAZZ_IE_PARALLEL
182 li a0,JAZZ_PARALLEL_IRQ
183 b loc_call
184
185/*
186 * Floppy IRQ
187 */
188loc_floppy: li s1,~JAZZ_IE_FLOPPY
189 li a0,JAZZ_FLOPPY_IRQ
190 b loc_call
191
192/*
193 * Sound IRQ
194 */
195loc_sound: PANIC("Unimplemented loc_sound handler")
196loc_video: PANIC("Unimplemented loc_video handler")
197
198/*
199 * Ethernet interrupt handler
200 */
201loc_ethernet: li s1,~JAZZ_IE_ETHERNET
202 li a0,JAZZ_ETHERNET_IRQ
203 b loc_call
204
205/*
206 * SCSI interrupt handler
207 */
208loc_scsi: li s1,~JAZZ_IE_SCSI
209 li a0,JAZZ_SCSI_IRQ
210 b loc_call
211
212/*
213 * Keyboard interrupt handler
214 */
215loc_keyboard: li s1,~JAZZ_IE_KEYBOARD
216 li a0,JAZZ_KEYBOARD_IRQ
217 b loc_call
218
219/*
220 * Mouse interrupt handler
221 */
222loc_mouse: li s1,~JAZZ_IE_MOUSE
223 li a0,JAZZ_MOUSE_IRQ
224 b loc_call
225
226/*
227 * Serial port 1 IRQ
228 */
229loc_serial1: li s1,~JAZZ_IE_SERIAL1
230 li a0,JAZZ_SERIAL1_IRQ
231 b loc_call
232
233/*
234 * Serial port 2 IRQ
235 */
236loc_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 */
244loc_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 */
2663: jal spurious_interrupt
267 j ret_from_irq
268
269/*
270 * Vectors for interrupts generated by local devices
271 */
272 .data
273local_vector: PTR loc_no_irq
274 PTR loc_parallel
275 PTR loc_floppy
276 PTR loc_sound
277 PTR loc_video
278 PTR loc_ethernet
279 PTR loc_scsi
280 PTR loc_keyboard
281 PTR loc_mouse
282 PTR loc_serial1
283 PTR loc_serial2
diff --git a/arch/mips/jazz/irq.c b/arch/mips/jazz/irq.c
index b309b1bcf2e8..becc9accd495 100644
--- a/arch/mips/jazz/irq.c
+++ b/arch/mips/jazz/irq.c
@@ -15,8 +15,6 @@
15#include <asm/io.h> 15#include <asm/io.h>
16#include <asm/jazz.h> 16#include <asm/jazz.h>
17 17
18extern asmlinkage void jazz_handle_int(void);
19
20static DEFINE_SPINLOCK(r4030_lock); 18static DEFINE_SPINLOCK(r4030_lock);
21 19
22static void enable_r4030_irq(unsigned int irq) 20static void enable_r4030_irq(unsigned int irq)
@@ -90,10 +88,82 @@ void __init init_r4030_ints(void)
90 */ 88 */
91void __init arch_init_irq(void) 89void __init arch_init_irq(void)
92{ 90{
93 set_except_vector(0, jazz_handle_int);
94
95 init_i8259_irqs(); /* Integrated i8259 */ 91 init_i8259_irqs(); /* Integrated i8259 */
96 init_r4030_ints(); 92 init_r4030_ints();
97 93
98 change_c0_status(ST0_IM, IE_IRQ4 | IE_IRQ3 | IE_IRQ2 | IE_IRQ1); 94 change_c0_status(ST0_IM, IE_IRQ4 | IE_IRQ3 | IE_IRQ2 | IE_IRQ1);
99} 95}
96
97static void loc_call(unsigned int irq, struct pt_regs *regs, unsigned int mask)
98{
99 r4030_write_reg16(JAZZ_IO_IRQ_ENABLE,
100 r4030_read_reg16(JAZZ_IO_IRQ_ENABLE) & mask);
101 do_IRQ(irq, regs);
102 r4030_write_reg16(JAZZ_IO_IRQ_ENABLE,
103 r4030_read_reg16(JAZZ_IO_IRQ_ENABLE) | mask);
104}
105
106static void ll_local_dev(struct pt_regs *regs)
107{
108 switch (r4030_read_reg32(JAZZ_IO_IRQ_SOURCE)) {
109 case 0:
110 panic("Unimplemented loc_no_irq handler");
111 break;
112 case 4:
113 loc_call(JAZZ_PARALLEL_IRQ, regs, JAZZ_IE_PARALLEL);
114 break;
115 case 8:
116 loc_call(JAZZ_PARALLEL_IRQ, regs, JAZZ_IE_FLOPPY);
117 break;
118 case 12:
119 panic("Unimplemented loc_sound handler");
120 break;
121 case 16:
122 panic("Unimplemented loc_video handler");
123 break;
124 case 20:
125 loc_call(JAZZ_ETHERNET_IRQ, regs, JAZZ_IE_ETHERNET);
126 break;
127 case 24:
128 loc_call(JAZZ_SCSI_IRQ, regs, JAZZ_IE_SCSI);
129 break;
130 case 28:
131 loc_call(JAZZ_KEYBOARD_IRQ, regs, JAZZ_IE_KEYBOARD);
132 break;
133 case 32:
134 loc_call(JAZZ_MOUSE_IRQ, regs, JAZZ_IE_MOUSE);
135 break;
136 case 36:
137 loc_call(JAZZ_SERIAL1_IRQ, regs, JAZZ_IE_SERIAL1);
138 break;
139 case 40:
140 loc_call(JAZZ_SERIAL2_IRQ, regs, JAZZ_IE_SERIAL2);
141 break;
142 }
143}
144
145asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
146{
147 unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
148
149 if (pending & IE_IRQ5)
150 write_c0_compare(0);
151 else if (pending & IE_IRQ4) {
152 r4030_read_reg32(JAZZ_TIMER_REGISTER);
153 do_IRQ(JAZZ_TIMER_IRQ, regs);
154 } else if (pending & IE_IRQ3)
155 panic("Unimplemented ISA NMI handler");
156 else if (pending & IE_IRQ2)
157 do_IRQ(r4030_read_reg32(JAZZ_EISA_IRQ_ACK), regs);
158 else if (pending & IE_IRQ1) {
159 ll_local_dev(regs);
160 } else if (unlikely(pending & IE_IRQ0))
161 panic("Unimplemented local_dma handler");
162 else if (pending & IE_SW1) {
163 clear_c0_cause(IE_SW1);
164 panic("Unimplemented sw1 handler");
165 } else if (pending & IE_SW0) {
166 clear_c0_cause(IE_SW0);
167 panic("Unimplemented sw0 handler");
168 }
169}
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