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Mike Frysinger9171fc82008-03-30 15:46:13 -04001/*
2 * U-boot - traps.c Routines related to interrupts and exceptions
3 *
4 * Copyright (c) 2005-2008 Analog Devices Inc.
5 *
6 * This file is based on
7 * No original Copyright holder listed,
8 * Probabily original (C) Roman Zippel (assigned DJD, 1999)
9 *
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>
13 *
14 * (C) Copyright 2000-2004
15 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
16 *
17 * Licensed under the GPL-2 or later.
18 */
19
20#include <common.h>
21#include <linux/types.h>
22#include <asm/traps.h>
23#include <asm/cplb.h>
24#include <asm/io.h>
25#include <asm/mach-common/bits/core.h>
26#include <asm/mach-common/bits/mpu.h>
27#include <asm/mach-common/bits/trace.h>
28#include "cpu.h"
29
30#define trace_buffer_save(x) \
31 do { \
32 (x) = bfin_read_TBUFCTL(); \
33 bfin_write_TBUFCTL((x) & ~TBUFEN); \
34 } while (0)
35
36#define trace_buffer_restore(x) \
37 bfin_write_TBUFCTL((x))
38
39/* The purpose of this map is to provide a mapping of address<->cplb settings
40 * rather than an exact map of what is actually addressable on the part. This
41 * map covers all current Blackfin parts. If you try to access an address that
42 * is in this map but not actually on the part, you won't get an exception and
43 * reboot, you'll get an external hardware addressing error and reboot. Since
44 * only the ends matter (you did something wrong and the board reset), the means
45 * are largely irrelevant.
46 */
47struct memory_map {
48 uint32_t start, end;
49 uint32_t data_flags, inst_flags;
50};
51const struct memory_map const bfin_memory_map[] = {
52 { /* external memory */
53 .start = 0x00000000,
54 .end = 0x20000000,
55 .data_flags = SDRAM_DGENERIC,
56 .inst_flags = SDRAM_IGENERIC,
57 },
58 { /* async banks */
59 .start = 0x20000000,
60 .end = 0x30000000,
61 .data_flags = SDRAM_EBIU,
62 .inst_flags = SDRAM_INON_CHBL,
63 },
64 { /* everything on chip */
65 .start = 0xE0000000,
66 .end = 0xFFFFFFFF,
67 .data_flags = L1_DMEMORY,
68 .inst_flags = L1_IMEMORY,
69 }
70};
71
72void trap_c(struct pt_regs *regs)
73{
74 uint32_t trapnr = (regs->seqstat & EXCAUSE);
75 bool data = false;
76
77 switch (trapnr) {
78 /* 0x26 - Data CPLB Miss */
79 case VEC_CPLB_M:
80
81 if (ANOMALY_05000261) {
82 static uint32_t last_cplb_fault_retx;
83 /*
84 * Work around an anomaly: if we see a new DCPLB fault,
85 * return without doing anything. Then,
86 * if we get the same fault again, handle it.
87 */
88 if (last_cplb_fault_retx != regs->retx) {
89 last_cplb_fault_retx = regs->retx;
90 return;
91 }
92 }
93
94 data = true;
95 /* fall through */
96
97 /* 0x27 - Instruction CPLB Miss */
98 case VEC_CPLB_I_M: {
99 volatile uint32_t *CPLB_ADDR_BASE, *CPLB_DATA_BASE, *CPLB_ADDR, *CPLB_DATA;
100 uint32_t new_cplb_addr = 0, new_cplb_data = 0;
101 static size_t last_evicted;
102 size_t i;
103
104 new_cplb_addr = (data ? bfin_read_DCPLB_FAULT_ADDR() : bfin_read_ICPLB_FAULT_ADDR()) & ~(4 * 1024 * 1024 - 1);
105
106 for (i = 0; i < ARRAY_SIZE(bfin_memory_map); ++i) {
107 /* if the exception is inside this range, lets use it */
108 if (new_cplb_addr >= bfin_memory_map[i].start &&
109 new_cplb_addr < bfin_memory_map[i].end)
110 break;
111 }
112 if (i == ARRAY_SIZE(bfin_memory_map)) {
113 printf("%cCPLB exception outside of memory map at 0x%p\n",
114 (data ? 'D' : 'I'), new_cplb_addr);
115 bfin_panic(regs);
116 } else
117 debug("CPLB addr %p matches map 0x%p - 0x%p\n", new_cplb_addr, bfin_memory_map[i].start, bfin_memory_map[i].end);
118 new_cplb_data = (data ? bfin_memory_map[i].data_flags : bfin_memory_map[i].inst_flags);
119
120 /* Turn the cache off */
121 SSYNC();
122 if (data) {
123 asm(" .align 8; ");
124 *pDMEM_CONTROL &= ~ENDCPLB;
125 } else {
126 asm(" .align 8; ");
127 *pIMEM_CONTROL &= ~ENICPLB;
128 }
129 SSYNC();
130
131 if (data) {
132 CPLB_ADDR_BASE = (uint32_t *)DCPLB_ADDR0;
133 CPLB_DATA_BASE = (uint32_t *)DCPLB_DATA0;
134 } else {
135 CPLB_ADDR_BASE = (uint32_t *)ICPLB_ADDR0;
136 CPLB_DATA_BASE = (uint32_t *)ICPLB_DATA0;
137 }
138
139 /* find the next unlocked entry and evict it */
140 i = last_evicted & 0xF;
141 debug("last evicted = %i\n", i);
142 CPLB_DATA = CPLB_DATA_BASE + i;
143 while (*CPLB_DATA & CPLB_LOCK) {
144 debug("skipping %i %p - %08X\n", i, CPLB_DATA, *CPLB_DATA);
145 i = (i + 1) & 0xF; /* wrap around */
146 CPLB_DATA = CPLB_DATA_BASE + i;
147 }
148 CPLB_ADDR = CPLB_ADDR_BASE + i;
149
150 debug("evicting entry %i: 0x%p 0x%08X\n", i, *CPLB_ADDR, *CPLB_DATA);
151 last_evicted = i + 1;
152 *CPLB_ADDR = new_cplb_addr;
153 *CPLB_DATA = new_cplb_data;
154
155 /* dump current table for debugging purposes */
156 CPLB_ADDR = CPLB_ADDR_BASE;
157 CPLB_DATA = CPLB_DATA_BASE;
158 for (i = 0; i < 16; ++i)
159 debug("%2i 0x%p 0x%08X\n", i, *CPLB_ADDR++, *CPLB_DATA++);
160
161 /* Turn the cache back on */
162 SSYNC();
163 if (data) {
164 asm(" .align 8; ");
165 *pDMEM_CONTROL |= ENDCPLB;
166 } else {
167 asm(" .align 8; ");
168 *pIMEM_CONTROL |= ENICPLB;
169 }
170 SSYNC();
171
172 break;
173 }
174
175 default:
176 /* All traps come here */
177 bfin_panic(regs);
178 }
179}
180
181#ifdef CONFIG_DEBUG_DUMP
182# define ENABLE_DUMP 1
183#else
184# define ENABLE_DUMP 0
185#endif
186
187#ifdef CONFIG_DEBUG_DUMP_SYMS
188# define ENABLE_DUMP_SYMS 1
189#else
190# define ENABLE_DUMP_SYMS 0
191#endif
192
193static const char *symbol_lookup(unsigned long addr, unsigned long *caddr)
194{
195 if (!ENABLE_DUMP_SYMS)
196 return NULL;
197
198 extern const char system_map[] __attribute__((__weak__));
199 const char *sym, *csym;
200 char *esym;
201 unsigned long sym_addr;
202
203 sym = system_map;
204 csym = NULL;
205 *caddr = 0;
206
207 while (*sym) {
208 sym_addr = simple_strtoul(sym, &esym, 16);
209 sym = esym + 1;
210 if (sym_addr > addr)
211 break;
212 *caddr = sym_addr;
213 csym = sym;
214 sym += strlen(sym) + 1;
215 }
216
217 return csym;
218}
219
220static void decode_address(char *buf, unsigned long address)
221{
222 unsigned long sym_addr;
223 const char *sym = symbol_lookup(address, &sym_addr);
224
225 if (sym) {
226 sprintf(buf, "<0x%p> { %s + 0x%x }", address, sym, address - sym_addr);
227 return;
228 }
229
230 if (!address)
231 sprintf(buf, "<0x%p> /* Maybe null pointer? */", address);
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200232 else if (address >= CONFIG_SYS_MONITOR_BASE &&
233 address < CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN)
Mike Frysinger9171fc82008-03-30 15:46:13 -0400234 sprintf(buf, "<0x%p> /* somewhere in u-boot */", address);
235 else
236 sprintf(buf, "<0x%p> /* unknown address */", address);
237}
238
239void dump(struct pt_regs *fp)
240{
241 char buf[150];
242 size_t i;
243
244 if (!ENABLE_DUMP)
245 return;
246
247 printf("SEQUENCER STATUS:\n");
248 printf(" SEQSTAT: %08lx IPEND: %04lx SYSCFG: %04lx\n",
249 fp->seqstat, fp->ipend, fp->syscfg);
250 printf(" HWERRCAUSE: 0x%lx\n", (fp->seqstat & HWERRCAUSE) >> HWERRCAUSE_P);
251 printf(" EXCAUSE : 0x%lx\n", (fp->seqstat & EXCAUSE) >> EXCAUSE_P);
252 for (i = 6; i <= 15; ++i) {
253 if (fp->ipend & (1 << i)) {
254 decode_address(buf, bfin_read32(EVT0 + 4*i));
255 printf(" physical IVG%i asserted : %s\n", i, buf);
256 }
257 }
258 decode_address(buf, fp->rete);
259 printf(" RETE: %s\n", buf);
260 decode_address(buf, fp->retn);
261 printf(" RETN: %s\n", buf);
262 decode_address(buf, fp->retx);
263 printf(" RETX: %s\n", buf);
264 decode_address(buf, fp->rets);
265 printf(" RETS: %s\n", buf);
266 decode_address(buf, fp->pc);
267 printf(" PC : %s\n", buf);
268
269 if (fp->seqstat & EXCAUSE) {
270 decode_address(buf, bfin_read_DCPLB_FAULT_ADDR());
271 printf("DCPLB_FAULT_ADDR: %s\n", buf);
272 decode_address(buf, bfin_read_ICPLB_FAULT_ADDR());
273 printf("ICPLB_FAULT_ADDR: %s\n", buf);
274 }
275
276 printf("\nPROCESSOR STATE:\n");
277 printf(" R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n",
278 fp->r0, fp->r1, fp->r2, fp->r3);
279 printf(" R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n",
280 fp->r4, fp->r5, fp->r6, fp->r7);
281 printf(" P0 : %08lx P1 : %08lx P2 : %08lx P3 : %08lx\n",
282 fp->p0, fp->p1, fp->p2, fp->p3);
283 printf(" P4 : %08lx P5 : %08lx FP : %08lx SP : %08lx\n",
284 fp->p4, fp->p5, fp->fp, fp);
285 printf(" LB0: %08lx LT0: %08lx LC0: %08lx\n",
286 fp->lb0, fp->lt0, fp->lc0);
287 printf(" LB1: %08lx LT1: %08lx LC1: %08lx\n",
288 fp->lb1, fp->lt1, fp->lc1);
289 printf(" B0 : %08lx L0 : %08lx M0 : %08lx I0 : %08lx\n",
290 fp->b0, fp->l0, fp->m0, fp->i0);
291 printf(" B1 : %08lx L1 : %08lx M1 : %08lx I1 : %08lx\n",
292 fp->b1, fp->l1, fp->m1, fp->i1);
293 printf(" B2 : %08lx L2 : %08lx M2 : %08lx I2 : %08lx\n",
294 fp->b2, fp->l2, fp->m2, fp->i2);
295 printf(" B3 : %08lx L3 : %08lx M3 : %08lx I3 : %08lx\n",
296 fp->b3, fp->l3, fp->m3, fp->i3);
297 printf("A0.w: %08lx A0.x: %08lx A1.w: %08lx A1.x: %08lx\n",
298 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
299
300 printf("USP : %08lx ASTAT: %08lx\n",
301 fp->usp, fp->astat);
302
303 printf("\n");
304}
305
306void dump_bfin_trace_buffer(void)
307{
308 char buf[150];
309 unsigned long tflags;
310 size_t i = 0;
311
312 if (!ENABLE_DUMP)
313 return;
314
315 trace_buffer_save(tflags);
316
317 printf("Hardware Trace:\n");
318
319 if (bfin_read_TBUFSTAT() & TBUFCNT) {
320 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
321 decode_address(buf, bfin_read_TBUF());
322 printf("%4i Target : %s\n", i, buf);
323 decode_address(buf, bfin_read_TBUF());
324 printf(" Source : %s\n", buf);
325 }
326 }
327
328 trace_buffer_restore(tflags);
329}
330
331void bfin_panic(struct pt_regs *regs)
332{
333 if (ENABLE_DUMP) {
334 unsigned long tflags;
335 trace_buffer_save(tflags);
336 }
337
338 puts(
339 "\n"
340 "\n"
341 "\n"
342 "Ack! Something bad happened to the Blackfin!\n"
343 "\n"
344 );
345 dump(regs);
346 dump_bfin_trace_buffer();
347 printf(
348 "\n"
349 "Please reset the board\n"
350 "\n"
351 );
352 bfin_reset_or_hang();
353}