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
14 * (C) Copyright 2000-2004
17 * Licensed under the GPL-2 or later.
21 #include <linux/types.h>
22 #include <asm/traps.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>
30 #define trace_buffer_save(x) \
32 (x) = bfin_read_TBUFCTL(); \
33 bfin_write_TBUFCTL((x) & ~TBUFEN); \
36 #define trace_buffer_restore(x) \
37 bfin_write_TBUFCTL((x))
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.
49 uint32_t data_flags, inst_flags;
51 const struct memory_map const bfin_memory_map[] = {
52 { /* external memory */
55 .data_flags = SDRAM_DGENERIC,
56 .inst_flags = SDRAM_IGENERIC,
61 .data_flags = SDRAM_EBIU,
62 .inst_flags = SDRAM_INON_CHBL,
64 { /* everything on chip */
67 .data_flags = L1_DMEMORY,
68 .inst_flags = L1_IMEMORY,
72 void trap_c(struct pt_regs *regs)
74 uint32_t trapnr = (regs->seqstat & EXCAUSE);
78 /* 0x26 - Data CPLB Miss */
81 if (ANOMALY_05000261) {
82 static uint32_t last_cplb_fault_retx;
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.
88 if (last_cplb_fault_retx != regs->retx) {
89 last_cplb_fault_retx = regs->retx;
97 /* 0x27 - Instruction CPLB Miss */
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;
104 new_cplb_addr = (data ? bfin_read_DCPLB_FAULT_ADDR() : bfin_read_ICPLB_FAULT_ADDR()) & ~(4 * 1024 * 1024 - 1);
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)
112 if (i == ARRAY_SIZE(bfin_memory_map)) {
113 printf("%cCPLB exception outside of memory map at 0x%p\n",
114 (data ? 'D' : 'I'), (void *)new_cplb_addr);
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);
121 CPLB_ADDR_BASE = (uint32_t *)DCPLB_ADDR0;
122 CPLB_DATA_BASE = (uint32_t *)DCPLB_DATA0;
124 CPLB_ADDR_BASE = (uint32_t *)ICPLB_ADDR0;
125 CPLB_DATA_BASE = (uint32_t *)ICPLB_DATA0;
128 /* find the next unlocked entry and evict it */
129 i = last_evicted & 0xF;
130 debug("last evicted = %i\n", i);
131 CPLB_DATA = CPLB_DATA_BASE + i;
132 while (*CPLB_DATA & CPLB_LOCK) {
133 debug("skipping %i %p - %08X\n", i, CPLB_DATA, *CPLB_DATA);
134 i = (i + 1) & 0xF; /* wrap around */
135 CPLB_DATA = CPLB_DATA_BASE + i;
137 CPLB_ADDR = CPLB_ADDR_BASE + i;
139 debug("evicting entry %i: 0x%p 0x%08X\n", i, *CPLB_ADDR, *CPLB_DATA);
140 last_evicted = i + 1;
142 /* need to turn off cplbs whenever we muck with the cplb table */
143 #if ENDCPLB != ENICPLB
144 # error cplb enable bit violates my sanity
146 uint32_t mem_control = (data ? DMEM_CONTROL : IMEM_CONTROL);
147 bfin_write32(mem_control, bfin_read32(mem_control) & ~ENDCPLB);
148 *CPLB_ADDR = new_cplb_addr;
149 *CPLB_DATA = new_cplb_data;
150 bfin_write32(mem_control, bfin_read32(mem_control) | ENDCPLB);
153 /* dump current table for debugging purposes */
154 CPLB_ADDR = CPLB_ADDR_BASE;
155 CPLB_DATA = CPLB_DATA_BASE;
156 for (i = 0; i < 16; ++i)
157 debug("%2i 0x%p 0x%08X\n", i, *CPLB_ADDR++, *CPLB_DATA++);
163 /* All traps come here */
168 #ifdef CONFIG_DEBUG_DUMP
169 # define ENABLE_DUMP 1
171 # define ENABLE_DUMP 0
174 #ifdef CONFIG_DEBUG_DUMP_SYMS
175 # define ENABLE_DUMP_SYMS 1
177 # define ENABLE_DUMP_SYMS 0
180 static const char *symbol_lookup(unsigned long addr, unsigned long *caddr)
182 if (!ENABLE_DUMP_SYMS)
185 extern const char system_map[] __attribute__((__weak__));
186 const char *sym, *csym;
188 unsigned long sym_addr;
195 sym_addr = simple_strtoul(sym, &esym, 16);
201 sym += strlen(sym) + 1;
207 static void decode_address(char *buf, unsigned long address)
209 unsigned long sym_addr;
210 void *paddr = (void *)address;
211 const char *sym = symbol_lookup(address, &sym_addr);
214 sprintf(buf, "<0x%p> { %s + 0x%lx }", paddr, sym, address - sym_addr);
219 sprintf(buf, "<0x%p> /* Maybe null pointer? */", paddr);
220 else if (address >= CONFIG_SYS_MONITOR_BASE &&
221 address < CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN)
222 sprintf(buf, "<0x%p> /* somewhere in u-boot */", paddr);
224 sprintf(buf, "<0x%p> /* unknown address */", paddr);
227 static char *strhwerrcause(uint16_t hwerrcause)
229 switch (hwerrcause) {
230 case 0x02: return "system mmr error";
231 case 0x03: return "external memory addressing error";
232 case 0x12: return "performance monitor overflow";
233 case 0x18: return "raise 5 instruction";
234 default: return "undef";
238 static char *strexcause(uint16_t excause)
241 case 0x00 ... 0xf: return "custom exception";
242 case 0x10: return "single step";
243 case 0x11: return "trace buffer full";
244 case 0x21: return "undef inst";
245 case 0x22: return "illegal inst";
246 case 0x23: return "dcplb prot violation";
247 case 0x24: return "misaligned data";
248 case 0x25: return "unrecoverable event";
249 case 0x26: return "dcplb miss";
250 case 0x27: return "multiple dcplb hit";
251 case 0x28: return "emulation watchpoint";
252 case 0x2a: return "misaligned inst";
253 case 0x2b: return "icplb prot violation";
254 case 0x2c: return "icplb miss";
255 case 0x2d: return "multiple icplb hit";
256 case 0x2e: return "illegal use of supervisor resource";
257 default: return "undef";
261 void dump(struct pt_regs *fp)
265 uint16_t hwerrcause, excause;
270 /* fp->ipend is garbage, so load it ourself */
271 fp->ipend = bfin_read_IPEND();
273 hwerrcause = (fp->seqstat & HWERRCAUSE) >> HWERRCAUSE_P;
274 excause = (fp->seqstat & EXCAUSE) >> EXCAUSE_P;
276 printf("SEQUENCER STATUS:\n");
277 printf(" SEQSTAT: %08lx IPEND: %04lx SYSCFG: %04lx\n",
278 fp->seqstat, fp->ipend, fp->syscfg);
279 printf(" HWERRCAUSE: 0x%x: %s\n", hwerrcause, strhwerrcause(hwerrcause));
280 printf(" EXCAUSE : 0x%x: %s\n", excause, strexcause(excause));
281 for (i = 6; i <= 15; ++i) {
282 if (fp->ipend & (1 << i)) {
283 decode_address(buf, bfin_read32(EVT0 + 4*i));
284 printf(" physical IVG%i asserted : %s\n", i, buf);
287 decode_address(buf, fp->rete);
288 printf(" RETE: %s\n", buf);
289 decode_address(buf, fp->retn);
290 printf(" RETN: %s\n", buf);
291 decode_address(buf, fp->retx);
292 printf(" RETX: %s\n", buf);
293 decode_address(buf, fp->rets);
294 printf(" RETS: %s\n", buf);
295 /* we lie and store RETI in "pc" */
296 decode_address(buf, fp->pc);
297 printf(" RETI: %s\n", buf);
299 if (fp->seqstat & EXCAUSE) {
300 decode_address(buf, bfin_read_DCPLB_FAULT_ADDR());
301 printf("DCPLB_FAULT_ADDR: %s\n", buf);
302 decode_address(buf, bfin_read_ICPLB_FAULT_ADDR());
303 printf("ICPLB_FAULT_ADDR: %s\n", buf);
306 printf("\nPROCESSOR STATE:\n");
307 printf(" R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n",
308 fp->r0, fp->r1, fp->r2, fp->r3);
309 printf(" R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n",
310 fp->r4, fp->r5, fp->r6, fp->r7);
311 printf(" P0 : %08lx P1 : %08lx P2 : %08lx P3 : %08lx\n",
312 fp->p0, fp->p1, fp->p2, fp->p3);
313 printf(" P4 : %08lx P5 : %08lx FP : %08lx SP : %08lx\n",
314 fp->p4, fp->p5, fp->fp, (unsigned long)fp);
315 printf(" LB0: %08lx LT0: %08lx LC0: %08lx\n",
316 fp->lb0, fp->lt0, fp->lc0);
317 printf(" LB1: %08lx LT1: %08lx LC1: %08lx\n",
318 fp->lb1, fp->lt1, fp->lc1);
319 printf(" B0 : %08lx L0 : %08lx M0 : %08lx I0 : %08lx\n",
320 fp->b0, fp->l0, fp->m0, fp->i0);
321 printf(" B1 : %08lx L1 : %08lx M1 : %08lx I1 : %08lx\n",
322 fp->b1, fp->l1, fp->m1, fp->i1);
323 printf(" B2 : %08lx L2 : %08lx M2 : %08lx I2 : %08lx\n",
324 fp->b2, fp->l2, fp->m2, fp->i2);
325 printf(" B3 : %08lx L3 : %08lx M3 : %08lx I3 : %08lx\n",
326 fp->b3, fp->l3, fp->m3, fp->i3);
327 printf("A0.w: %08lx A0.x: %08lx A1.w: %08lx A1.x: %08lx\n",
328 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
330 printf("USP : %08lx ASTAT: %08lx\n",
336 void dump_bfin_trace_buffer(void)
339 unsigned long tflags;
345 trace_buffer_save(tflags);
347 printf("Hardware Trace:\n");
349 if (bfin_read_TBUFSTAT() & TBUFCNT) {
350 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
351 decode_address(buf, bfin_read_TBUF());
352 printf("%4i Target : %s\n", i, buf);
353 decode_address(buf, bfin_read_TBUF());
354 printf(" Source : %s\n", buf);
358 trace_buffer_restore(tflags);
361 void bfin_panic(struct pt_regs *regs)
364 unsigned long tflags;
365 trace_buffer_save(tflags);
372 "Ack! Something bad happened to the Blackfin!\n"
376 dump_bfin_trace_buffer();
378 bfin_reset_or_hang();