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-rw-r--r--arch/blackfin/cpu/traps.c410
1 files changed, 410 insertions, 0 deletions
diff --git a/arch/blackfin/cpu/traps.c b/arch/blackfin/cpu/traps.c
new file mode 100644
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+++ b/arch/blackfin/cpu/traps.c
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+/*
+ * 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();
+}