+++ /dev/null
-/*
- * U-boot - traps.c Routines related to interrupts and exceptions
- *
- * Copyright (c) 2005-2008 Analog Devices Inc.
- *
- * This file is based on
- * No original Copyright holder listed,
- * Probabily original (C) Roman Zippel (assigned DJD, 1999)
- *
- * Copyright 2003 Metrowerks - for Blackfin
- * Copyright 2000-2001 Lineo, Inc. D. Jeff Dionne <jeff@lineo.ca>
- * Copyright 1999-2000 D. Jeff Dionne, <jeff@uclinux.org>
- *
- * (C) Copyright 2000-2004
- * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <common.h>
-#include <kgdb.h>
-#include <linux/types.h>
-#include <asm/traps.h>
-#include <asm/cplb.h>
-#include <asm/io.h>
-#include <asm/mach-common/bits/core.h>
-#include <asm/mach-common/bits/mpu.h>
-#include <asm/mach-common/bits/trace.h>
-#include <asm/deferred.h>
-#include "cpu.h"
-
-#define trace_buffer_save(x) \
- do { \
- (x) = bfin_read_TBUFCTL(); \
- bfin_write_TBUFCTL((x) & ~TBUFEN); \
- } while (0)
-
-#define trace_buffer_restore(x) \
- bfin_write_TBUFCTL((x))
-
-/* The purpose of this map is to provide a mapping of address<->cplb settings
- * rather than an exact map of what is actually addressable on the part. This
- * map covers all current Blackfin parts. If you try to access an address that
- * is in this map but not actually on the part, you won't get an exception and
- * reboot, you'll get an external hardware addressing error and reboot. Since
- * only the ends matter (you did something wrong and the board reset), the means
- * are largely irrelevant.
- */
-struct memory_map {
- uint32_t start, end;
- uint32_t data_flags, inst_flags;
-};
-const struct memory_map const bfin_memory_map[] = {
- { /* external memory */
- .start = 0x00000000,
- .end = 0x20000000,
- .data_flags = SDRAM_DGENERIC,
- .inst_flags = SDRAM_IGENERIC,
- },
- { /* async banks */
- .start = 0x20000000,
- .end = 0x30000000,
- .data_flags = SDRAM_EBIU,
- .inst_flags = SDRAM_INON_CHBL,
- },
- { /* everything on chip */
- .start = 0xE0000000,
- .end = 0xFFFFFFFF,
- .data_flags = L1_DMEMORY,
- .inst_flags = L1_IMEMORY,
- }
-};
-
-#ifdef CONFIG_EXCEPTION_DEFER
-unsigned int deferred_regs[deferred_regs_last];
-#endif
-
-/*
- * Handle all exceptions while running in EVT3 or EVT5
- */
-int trap_c(struct pt_regs *regs, uint32_t level)
-{
- uint32_t ret = 0;
- uint32_t trapnr = (regs->seqstat & EXCAUSE);
- bool data = false;
-
- switch (trapnr) {
- /* 0x26 - Data CPLB Miss */
- case VEC_CPLB_M:
-
- if (ANOMALY_05000261) {
- static uint32_t last_cplb_fault_retx;
- /*
- * Work around an anomaly: if we see a new DCPLB fault,
- * return without doing anything. Then,
- * if we get the same fault again, handle it.
- */
- if (last_cplb_fault_retx != regs->retx) {
- last_cplb_fault_retx = regs->retx;
- return ret;
- }
- }
-
- data = true;
- /* fall through */
-
- /* 0x27 - Instruction CPLB Miss */
- case VEC_CPLB_I_M: {
- volatile uint32_t *CPLB_ADDR_BASE, *CPLB_DATA_BASE, *CPLB_ADDR, *CPLB_DATA;
- uint32_t new_cplb_addr = 0, new_cplb_data = 0;
- static size_t last_evicted;
- size_t i;
- unsigned long tflags;
-
-#ifdef CONFIG_EXCEPTION_DEFER
- /* This should never happen */
- if (level == 5)
- bfin_panic(regs);
-#endif
-
- /*
- * Keep the trace buffer so that a miss here points people
- * to the right place (their code). Crashes here rarely
- * happen. If they do, only the Blackfin maintainer cares.
- */
- trace_buffer_save(tflags);
-
- new_cplb_addr = (data ? bfin_read_DCPLB_FAULT_ADDR() : bfin_read_ICPLB_FAULT_ADDR()) & ~(4 * 1024 * 1024 - 1);
-
- for (i = 0; i < ARRAY_SIZE(bfin_memory_map); ++i) {
- /* if the exception is inside this range, lets use it */
- if (new_cplb_addr >= bfin_memory_map[i].start &&
- new_cplb_addr < bfin_memory_map[i].end)
- break;
- }
- if (i == ARRAY_SIZE(bfin_memory_map)) {
- printf("%cCPLB exception outside of memory map at 0x%p\n",
- (data ? 'D' : 'I'), (void *)new_cplb_addr);
- bfin_panic(regs);
- } else
- debug("CPLB addr %p matches map 0x%p - 0x%p\n", new_cplb_addr, bfin_memory_map[i].start, bfin_memory_map[i].end);
- new_cplb_data = (data ? bfin_memory_map[i].data_flags : bfin_memory_map[i].inst_flags);
-
- if (data) {
- CPLB_ADDR_BASE = (uint32_t *)DCPLB_ADDR0;
- CPLB_DATA_BASE = (uint32_t *)DCPLB_DATA0;
- } else {
- CPLB_ADDR_BASE = (uint32_t *)ICPLB_ADDR0;
- CPLB_DATA_BASE = (uint32_t *)ICPLB_DATA0;
- }
-
- /* find the next unlocked entry and evict it */
- i = last_evicted & 0xF;
- debug("last evicted = %i\n", i);
- CPLB_DATA = CPLB_DATA_BASE + i;
- while (*CPLB_DATA & CPLB_LOCK) {
- debug("skipping %i %p - %08X\n", i, CPLB_DATA, *CPLB_DATA);
- i = (i + 1) & 0xF; /* wrap around */
- CPLB_DATA = CPLB_DATA_BASE + i;
- }
- CPLB_ADDR = CPLB_ADDR_BASE + i;
-
- debug("evicting entry %i: 0x%p 0x%08X\n", i, *CPLB_ADDR, *CPLB_DATA);
- last_evicted = i + 1;
-
- /* need to turn off cplbs whenever we muck with the cplb table */
-#if ENDCPLB != ENICPLB
-# error cplb enable bit violates my sanity
-#endif
- uint32_t mem_control = (data ? DMEM_CONTROL : IMEM_CONTROL);
- bfin_write32(mem_control, bfin_read32(mem_control) & ~ENDCPLB);
- *CPLB_ADDR = new_cplb_addr;
- *CPLB_DATA = new_cplb_data;
- bfin_write32(mem_control, bfin_read32(mem_control) | ENDCPLB);
- SSYNC();
-
- /* dump current table for debugging purposes */
- CPLB_ADDR = CPLB_ADDR_BASE;
- CPLB_DATA = CPLB_DATA_BASE;
- for (i = 0; i < 16; ++i)
- debug("%2i 0x%p 0x%08X\n", i, *CPLB_ADDR++, *CPLB_DATA++);
-
- trace_buffer_restore(tflags);
- break;
- }
-#ifdef CONFIG_CMD_KGDB
- /* Single step
- * if we are in IRQ5, just ignore, otherwise defer, and handle it in kgdb
- */
- case VEC_STEP:
- if (level == 3) {
- /* If we just returned from an interrupt, the single step
- * event is for the RTI instruction.
- */
- if (regs->retx == regs->pc)
- break;
- /* we just return if we are single stepping through IRQ5 */
- if (regs->ipend & 0x20)
- break;
- /* Otherwise, turn single stepping off & fall through,
- * which defers to IRQ5
- */
- regs->syscfg &= ~1;
- }
- /* fall through */
-#endif
- default:
-#ifdef CONFIG_CMD_KGDB
- if (level == 3) {
- /* We need to handle this at EVT5, so try again */
- ret = 1;
- break;
- }
- if (debugger_exception_handler && (*debugger_exception_handler)(regs))
- return 0;
-#endif
- bfin_panic(regs);
- }
- return ret;
-}
-
-#ifdef CONFIG_DEBUG_DUMP
-# define ENABLE_DUMP 1
-#else
-# define ENABLE_DUMP 0
-#endif
-
-#ifndef CONFIG_KALLSYMS
-const char *symbol_lookup(unsigned long addr, unsigned long *caddr)
-{
- *caddr = addr;
- return "N/A";
-}
-#endif
-
-static void decode_address(char *buf, unsigned long address)
-{
- unsigned long sym_addr;
- void *paddr = (void *)address;
- const char *sym = symbol_lookup(address, &sym_addr);
-
- if (sym) {
- sprintf(buf, "<0x%p> { %s + 0x%lx }", paddr, sym, address - sym_addr);
- return;
- }
-
- if (!address)
- sprintf(buf, "<0x%p> /* Maybe null pointer? */", paddr);
- else if (address >= CONFIG_SYS_MONITOR_BASE &&
- address < CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN)
- sprintf(buf, "<0x%p> /* somewhere in u-boot */", paddr);
- else
- sprintf(buf, "<0x%p> /* unknown address */", paddr);
-}
-
-static char *strhwerrcause(uint16_t hwerrcause)
-{
- switch (hwerrcause) {
- case 0x02: return "system mmr error";
- case 0x03: return "external memory addressing error";
- case 0x12: return "performance monitor overflow";
- case 0x18: return "raise 5 instruction";
- default: return "undef";
- }
-}
-
-static char *strexcause(uint16_t excause)
-{
- switch (excause) {
- case 0x00 ... 0xf: return "custom exception";
- case 0x10: return "single step";
- case 0x11: return "trace buffer full";
- case 0x21: return "undef inst";
- case 0x22: return "illegal inst";
- case 0x23: return "dcplb prot violation";
- case 0x24: return "misaligned data";
- case 0x25: return "unrecoverable event";
- case 0x26: return "dcplb miss";
- case 0x27: return "multiple dcplb hit";
- case 0x28: return "emulation watchpoint";
- case 0x2a: return "misaligned inst";
- case 0x2b: return "icplb prot violation";
- case 0x2c: return "icplb miss";
- case 0x2d: return "multiple icplb hit";
- case 0x2e: return "illegal use of supervisor resource";
- default: return "undef";
- }
-}
-
-void dump(struct pt_regs *fp)
-{
- char buf[150];
- int i;
- uint16_t hwerrcause, excause;
-
- if (!ENABLE_DUMP)
- return;
-
-#ifndef CONFIG_CMD_KGDB
- /* fp->ipend is normally garbage, so load it ourself */
- fp->ipend = bfin_read_IPEND();
-#endif
-
- hwerrcause = (fp->seqstat & HWERRCAUSE) >> HWERRCAUSE_P;
- excause = (fp->seqstat & EXCAUSE) >> EXCAUSE_P;
-
- printf("SEQUENCER STATUS:\n");
- printf(" SEQSTAT: %08lx IPEND: %04lx SYSCFG: %04lx\n",
- fp->seqstat, fp->ipend, fp->syscfg);
- printf(" HWERRCAUSE: 0x%x: %s\n", hwerrcause, strhwerrcause(hwerrcause));
- printf(" EXCAUSE : 0x%x: %s\n", excause, strexcause(excause));
- for (i = 6; i <= 15; ++i) {
- if (fp->ipend & (1 << i)) {
- decode_address(buf, bfin_read32(EVT0 + 4*i));
- printf(" physical IVG%i asserted : %s\n", i, buf);
- }
- }
- decode_address(buf, fp->rete);
- printf(" RETE: %s\n", buf);
- decode_address(buf, fp->retn);
- printf(" RETN: %s\n", buf);
- decode_address(buf, fp->retx);
- printf(" RETX: %s\n", buf);
- decode_address(buf, fp->rets);
- printf(" RETS: %s\n", buf);
- /* we lie and store RETI in "pc" */
- decode_address(buf, fp->pc);
- printf(" RETI: %s\n", buf);
-
- if (fp->seqstat & EXCAUSE) {
- decode_address(buf, bfin_read_DCPLB_FAULT_ADDR());
- printf("DCPLB_FAULT_ADDR: %s\n", buf);
- decode_address(buf, bfin_read_ICPLB_FAULT_ADDR());
- printf("ICPLB_FAULT_ADDR: %s\n", buf);
- }
-
- printf("\nPROCESSOR STATE:\n");
- printf(" R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n",
- fp->r0, fp->r1, fp->r2, fp->r3);
- printf(" R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n",
- fp->r4, fp->r5, fp->r6, fp->r7);
- printf(" P0 : %08lx P1 : %08lx P2 : %08lx P3 : %08lx\n",
- fp->p0, fp->p1, fp->p2, fp->p3);
- printf(" P4 : %08lx P5 : %08lx FP : %08lx SP : %08lx\n",
- fp->p4, fp->p5, fp->fp, (unsigned long)fp);
- printf(" LB0: %08lx LT0: %08lx LC0: %08lx\n",
- fp->lb0, fp->lt0, fp->lc0);
- printf(" LB1: %08lx LT1: %08lx LC1: %08lx\n",
- fp->lb1, fp->lt1, fp->lc1);
- printf(" B0 : %08lx L0 : %08lx M0 : %08lx I0 : %08lx\n",
- fp->b0, fp->l0, fp->m0, fp->i0);
- printf(" B1 : %08lx L1 : %08lx M1 : %08lx I1 : %08lx\n",
- fp->b1, fp->l1, fp->m1, fp->i1);
- printf(" B2 : %08lx L2 : %08lx M2 : %08lx I2 : %08lx\n",
- fp->b2, fp->l2, fp->m2, fp->i2);
- printf(" B3 : %08lx L3 : %08lx M3 : %08lx I3 : %08lx\n",
- fp->b3, fp->l3, fp->m3, fp->i3);
- printf("A0.w: %08lx A0.x: %08lx A1.w: %08lx A1.x: %08lx\n",
- fp->a0w, fp->a0x, fp->a1w, fp->a1x);
-
- printf("USP : %08lx ASTAT: %08lx\n",
- fp->usp, fp->astat);
-
- printf("\n");
-}
-
-void dump_bfin_trace_buffer(void)
-{
- char buf[150];
- unsigned long tflags;
- int i = 0;
-
- if (!ENABLE_DUMP)
- return;
-
- trace_buffer_save(tflags);
-
- printf("Hardware Trace:\n");
-
- if (bfin_read_TBUFSTAT() & TBUFCNT) {
- for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
- decode_address(buf, bfin_read_TBUF());
- printf("%4i Target : %s\n", i, buf);
- decode_address(buf, bfin_read_TBUF());
- printf(" Source : %s\n", buf);
- }
- }
-
- trace_buffer_restore(tflags);
-}
-
-void bfin_panic(struct pt_regs *regs)
-{
- if (ENABLE_DUMP) {
- unsigned long tflags;
- trace_buffer_save(tflags);
- }
-
- puts(
- "\n"
- "\n"
- "\n"
- "Ack! Something bad happened to the Blackfin!\n"
- "\n"
- );
- dump(regs);
- dump_bfin_trace_buffer();
- puts("\n");
- bfin_reset_or_hang();
-}
projects / u-boot / blobdiff