2 * U-boot - traps.c Routines related to interrupts and exceptions
4 * Copyright (c) 2005-2008 Analog Devices Inc.
6 * This file is based on
7 * No original Copyright holder listed,
8 * Probabily original (C) Roman Zippel (assigned DJD, 1999)
10 * Copyright 2003 Metrowerks - for Blackfin
11 * Copyright 2000-2001 Lineo, Inc. D. Jeff Dionne <jeff@lineo.ca>
12 * Copyright 1999-2000 D. Jeff Dionne, <jeff@uclinux.org>
14 * (C) Copyright 2000-2004
15 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
17 * Licensed under the GPL-2 or later.
22 #include <linux/types.h>
23 #include <asm/traps.h>
26 #include <asm/mach-common/bits/core.h>
27 #include <asm/mach-common/bits/mpu.h>
28 #include <asm/mach-common/bits/trace.h>
29 #include <asm/deferred.h>
32 #ifdef CONFIG_DEBUG_DUMP
33 # define ENABLE_DUMP 1
35 # define ENABLE_DUMP 0
38 #define trace_buffer_save(x) \
42 (x) = bfin_read_TBUFCTL(); \
43 bfin_write_TBUFCTL((x) & ~TBUFEN); \
46 #define trace_buffer_restore(x) \
50 bfin_write_TBUFCTL((x)); \
53 /* The purpose of this map is to provide a mapping of address<->cplb settings
54 * rather than an exact map of what is actually addressable on the part. This
55 * map covers all current Blackfin parts. If you try to access an address that
56 * is in this map but not actually on the part, you won't get an exception and
57 * reboot, you'll get an external hardware addressing error and reboot. Since
58 * only the ends matter (you did something wrong and the board reset), the means
59 * are largely irrelevant.
63 uint32_t data_flags
, inst_flags
;
65 const struct memory_map
const bfin_memory_map
[] = {
66 { /* external memory */
69 .data_flags
= SDRAM_DGENERIC
,
70 .inst_flags
= SDRAM_IGENERIC
,
75 .data_flags
= SDRAM_EBIU
,
76 .inst_flags
= SDRAM_INON_CHBL
,
78 { /* everything on chip */
81 .data_flags
= L1_DMEMORY
,
82 .inst_flags
= L1_IMEMORY
,
86 #ifdef CONFIG_EXCEPTION_DEFER
87 unsigned int deferred_regs
[deferred_regs_last
];
91 * Handle all exceptions while running in EVT3 or EVT5
93 int trap_c(struct pt_regs
*regs
, uint32_t level
)
96 uint32_t trapnr
= (regs
->seqstat
& EXCAUSE
);
101 * Keep the trace buffer so that a miss here points people
102 * to the right place (their code). Crashes here rarely
103 * happen. If they do, only the Blackfin maintainer cares.
105 trace_buffer_save(tflags
);
108 /* 0x26 - Data CPLB Miss */
111 if (ANOMALY_05000261
) {
112 static uint32_t last_cplb_fault_retx
;
114 * Work around an anomaly: if we see a new DCPLB fault,
115 * return without doing anything. Then,
116 * if we get the same fault again, handle it.
118 if (last_cplb_fault_retx
!= regs
->retx
) {
119 last_cplb_fault_retx
= regs
->retx
;
127 /* 0x27 - Instruction CPLB Miss */
129 volatile uint32_t *CPLB_ADDR_BASE
, *CPLB_DATA_BASE
, *CPLB_ADDR
, *CPLB_DATA
;
130 uint32_t new_cplb_addr
= 0, new_cplb_data
= 0;
131 static size_t last_evicted
;
134 #ifdef CONFIG_EXCEPTION_DEFER
135 /* This should never happen */
140 new_cplb_addr
= (data
? bfin_read_DCPLB_FAULT_ADDR() : bfin_read_ICPLB_FAULT_ADDR()) & ~(4 * 1024 * 1024 - 1);
142 for (i
= 0; i
< ARRAY_SIZE(bfin_memory_map
); ++i
) {
143 /* if the exception is inside this range, lets use it */
144 if (new_cplb_addr
>= bfin_memory_map
[i
].start
&&
145 new_cplb_addr
< bfin_memory_map
[i
].end
)
148 if (i
== ARRAY_SIZE(bfin_memory_map
)) {
149 printf("%cCPLB exception outside of memory map at 0x%p\n",
150 (data
? 'D' : 'I'), (void *)new_cplb_addr
);
153 debug("CPLB addr %p matches map 0x%p - 0x%p\n", new_cplb_addr
, bfin_memory_map
[i
].start
, bfin_memory_map
[i
].end
);
154 new_cplb_data
= (data
? bfin_memory_map
[i
].data_flags
: bfin_memory_map
[i
].inst_flags
);
157 CPLB_ADDR_BASE
= (uint32_t *)DCPLB_ADDR0
;
158 CPLB_DATA_BASE
= (uint32_t *)DCPLB_DATA0
;
160 CPLB_ADDR_BASE
= (uint32_t *)ICPLB_ADDR0
;
161 CPLB_DATA_BASE
= (uint32_t *)ICPLB_DATA0
;
164 /* find the next unlocked entry and evict it */
165 i
= last_evicted
& 0xF;
166 debug("last evicted = %i\n", i
);
167 CPLB_DATA
= CPLB_DATA_BASE
+ i
;
168 while (*CPLB_DATA
& CPLB_LOCK
) {
169 debug("skipping %i %p - %08X\n", i
, CPLB_DATA
, *CPLB_DATA
);
170 i
= (i
+ 1) & 0xF; /* wrap around */
171 CPLB_DATA
= CPLB_DATA_BASE
+ i
;
173 CPLB_ADDR
= CPLB_ADDR_BASE
+ i
;
175 debug("evicting entry %i: 0x%p 0x%08X\n", i
, *CPLB_ADDR
, *CPLB_DATA
);
176 last_evicted
= i
+ 1;
178 /* need to turn off cplbs whenever we muck with the cplb table */
179 #if ENDCPLB != ENICPLB
180 # error cplb enable bit violates my sanity
182 uint32_t mem_control
= (data
? DMEM_CONTROL
: IMEM_CONTROL
);
183 bfin_write32(mem_control
, bfin_read32(mem_control
) & ~ENDCPLB
);
184 *CPLB_ADDR
= new_cplb_addr
;
185 *CPLB_DATA
= new_cplb_data
;
186 bfin_write32(mem_control
, bfin_read32(mem_control
) | ENDCPLB
);
189 /* dump current table for debugging purposes */
190 CPLB_ADDR
= CPLB_ADDR_BASE
;
191 CPLB_DATA
= CPLB_DATA_BASE
;
192 for (i
= 0; i
< 16; ++i
)
193 debug("%2i 0x%p 0x%08X\n", i
, *CPLB_ADDR
++, *CPLB_DATA
++);
197 #ifdef CONFIG_CMD_KGDB
199 * if we are in IRQ5, just ignore, otherwise defer, and handle it in kgdb
203 /* If we just returned from an interrupt, the single step
204 * event is for the RTI instruction.
206 if (regs
->retx
== regs
->pc
)
208 /* we just return if we are single stepping through IRQ5 */
209 if (regs
->ipend
& 0x20)
211 /* Otherwise, turn single stepping off & fall through,
212 * which defers to IRQ5
219 #ifdef CONFIG_CMD_KGDB
221 /* We need to handle this at EVT5, so try again */
226 if (debugger_exception_handler
&& (*debugger_exception_handler
)(regs
))
232 trace_buffer_restore(tflags
);
237 #ifndef CONFIG_KALLSYMS
238 const char *symbol_lookup(unsigned long addr
, unsigned long *caddr
)
245 static void decode_address(char *buf
, unsigned long address
)
247 unsigned long sym_addr
;
248 void *paddr
= (void *)address
;
249 const char *sym
= symbol_lookup(address
, &sym_addr
);
252 sprintf(buf
, "<0x%p> { %s + 0x%lx }", paddr
, sym
, address
- sym_addr
);
257 sprintf(buf
, "<0x%p> /* Maybe null pointer? */", paddr
);
258 else if (address
>= CONFIG_SYS_MONITOR_BASE
&&
259 address
< CONFIG_SYS_MONITOR_BASE
+ CONFIG_SYS_MONITOR_LEN
)
260 sprintf(buf
, "<0x%p> /* somewhere in u-boot */", paddr
);
262 sprintf(buf
, "<0x%p> /* unknown address */", paddr
);
265 static char *strhwerrcause(uint16_t hwerrcause
)
267 switch (hwerrcause
) {
268 case 0x02: return "system mmr error";
269 case 0x03: return "external memory addressing error";
270 case 0x12: return "performance monitor overflow";
271 case 0x18: return "raise 5 instruction";
272 default: return "undef";
276 static char *strexcause(uint16_t excause
)
279 case 0x00 ... 0xf: return "custom exception";
280 case 0x10: return "single step";
281 case 0x11: return "trace buffer full";
282 case 0x21: return "undef inst";
283 case 0x22: return "illegal inst";
284 case 0x23: return "dcplb prot violation";
285 case 0x24: return "misaligned data";
286 case 0x25: return "unrecoverable event";
287 case 0x26: return "dcplb miss";
288 case 0x27: return "multiple dcplb hit";
289 case 0x28: return "emulation watchpoint";
290 case 0x2a: return "misaligned inst";
291 case 0x2b: return "icplb prot violation";
292 case 0x2c: return "icplb miss";
293 case 0x2d: return "multiple icplb hit";
294 case 0x2e: return "illegal use of supervisor resource";
295 default: return "undef";
299 void dump(struct pt_regs
*fp
)
303 uint16_t hwerrcause
, excause
;
308 #ifndef CONFIG_CMD_KGDB
309 /* fp->ipend is normally garbage, so load it ourself */
310 fp
->ipend
= bfin_read_IPEND();
313 hwerrcause
= (fp
->seqstat
& HWERRCAUSE
) >> HWERRCAUSE_P
;
314 excause
= (fp
->seqstat
& EXCAUSE
) >> EXCAUSE_P
;
316 printf("SEQUENCER STATUS:\n");
317 printf(" SEQSTAT: %08lx IPEND: %04lx SYSCFG: %04lx\n",
318 fp
->seqstat
, fp
->ipend
, fp
->syscfg
);
319 printf(" HWERRCAUSE: 0x%x: %s\n", hwerrcause
, strhwerrcause(hwerrcause
));
320 printf(" EXCAUSE : 0x%x: %s\n", excause
, strexcause(excause
));
321 for (i
= 6; i
<= 15; ++i
) {
322 if (fp
->ipend
& (1 << i
)) {
323 decode_address(buf
, bfin_read32(EVT0
+ 4*i
));
324 printf(" physical IVG%i asserted : %s\n", i
, buf
);
327 decode_address(buf
, fp
->rete
);
328 printf(" RETE: %s\n", buf
);
329 decode_address(buf
, fp
->retn
);
330 printf(" RETN: %s\n", buf
);
331 decode_address(buf
, fp
->retx
);
332 printf(" RETX: %s\n", buf
);
333 decode_address(buf
, fp
->rets
);
334 printf(" RETS: %s\n", buf
);
335 /* we lie and store RETI in "pc" */
336 decode_address(buf
, fp
->pc
);
337 printf(" RETI: %s\n", buf
);
339 if (fp
->seqstat
& EXCAUSE
) {
340 decode_address(buf
, bfin_read_DCPLB_FAULT_ADDR());
341 printf("DCPLB_FAULT_ADDR: %s\n", buf
);
342 decode_address(buf
, bfin_read_ICPLB_FAULT_ADDR());
343 printf("ICPLB_FAULT_ADDR: %s\n", buf
);
346 printf("\nPROCESSOR STATE:\n");
347 printf(" R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n",
348 fp
->r0
, fp
->r1
, fp
->r2
, fp
->r3
);
349 printf(" R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n",
350 fp
->r4
, fp
->r5
, fp
->r6
, fp
->r7
);
351 printf(" P0 : %08lx P1 : %08lx P2 : %08lx P3 : %08lx\n",
352 fp
->p0
, fp
->p1
, fp
->p2
, fp
->p3
);
353 printf(" P4 : %08lx P5 : %08lx FP : %08lx SP : %08lx\n",
354 fp
->p4
, fp
->p5
, fp
->fp
, (unsigned long)fp
);
355 printf(" LB0: %08lx LT0: %08lx LC0: %08lx\n",
356 fp
->lb0
, fp
->lt0
, fp
->lc0
);
357 printf(" LB1: %08lx LT1: %08lx LC1: %08lx\n",
358 fp
->lb1
, fp
->lt1
, fp
->lc1
);
359 printf(" B0 : %08lx L0 : %08lx M0 : %08lx I0 : %08lx\n",
360 fp
->b0
, fp
->l0
, fp
->m0
, fp
->i0
);
361 printf(" B1 : %08lx L1 : %08lx M1 : %08lx I1 : %08lx\n",
362 fp
->b1
, fp
->l1
, fp
->m1
, fp
->i1
);
363 printf(" B2 : %08lx L2 : %08lx M2 : %08lx I2 : %08lx\n",
364 fp
->b2
, fp
->l2
, fp
->m2
, fp
->i2
);
365 printf(" B3 : %08lx L3 : %08lx M3 : %08lx I3 : %08lx\n",
366 fp
->b3
, fp
->l3
, fp
->m3
, fp
->i3
);
367 printf("A0.w: %08lx A0.x: %08lx A1.w: %08lx A1.x: %08lx\n",
368 fp
->a0w
, fp
->a0x
, fp
->a1w
, fp
->a1x
);
370 printf("USP : %08lx ASTAT: %08lx\n",
376 static void _dump_bfin_trace_buffer(void)
384 printf("Hardware Trace:\n");
386 if (bfin_read_TBUFSTAT() & TBUFCNT
) {
387 for (; bfin_read_TBUFSTAT() & TBUFCNT
; i
++) {
388 decode_address(buf
, bfin_read_TBUF());
389 printf("%4i Target : %s\n", i
, buf
);
390 decode_address(buf
, bfin_read_TBUF());
391 printf(" Source : %s\n", buf
);
396 void dump_bfin_trace_buffer(void)
398 unsigned long tflags
;
399 trace_buffer_save(tflags
);
400 _dump_bfin_trace_buffer();
401 trace_buffer_restore(tflags
);
404 void bfin_dump(struct pt_regs
*regs
)
406 unsigned long tflags
;
408 trace_buffer_save(tflags
);
414 "Ack! Something bad happened to the Blackfin!\n"
418 _dump_bfin_trace_buffer();
421 trace_buffer_restore(tflags
);
424 void bfin_panic(struct pt_regs
*regs
)
426 unsigned long tflags
;
427 trace_buffer_save(tflags
);
429 panic("PANIC: Blackfin internal error");