summaryrefslogtreecommitdiffstats
path: root/arch/blackfin/mach-common/irqpanic.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/blackfin/mach-common/irqpanic.c')
-rw-r--r--arch/blackfin/mach-common/irqpanic.c194
1 files changed, 194 insertions, 0 deletions
diff --git a/arch/blackfin/mach-common/irqpanic.c b/arch/blackfin/mach-common/irqpanic.c
new file mode 100644
index 0000000..f05e3da
--- /dev/null
+++ b/arch/blackfin/mach-common/irqpanic.c
@@ -0,0 +1,194 @@
+/*
+ * File: arch/blackfin/mach-common/irqpanic.c
+ * Based on:
+ * Author:
+ *
+ * Created: ?
+ * Description: panic kernel with dump information
+ *
+ * Modified: rgetz - added cache checking code 14Feb06
+ * Copyright 2004-2006 Analog Devices Inc.
+ *
+ * Bugs: Enter bugs at http://blackfin.uclinux.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/module.h>
+#include <linux/kernel_stat.h>
+#include <linux/sched.h>
+#include <asm/traps.h>
+#include <asm/blackfin.h>
+
+#include "../oprofile/op_blackfin.h"
+
+#ifdef CONFIG_DEBUG_ICACHE_CHECK
+#define L1_ICACHE_START 0xffa10000
+#define L1_ICACHE_END 0xffa13fff
+void irq_panic(int reason, struct pt_regs *regs) __attribute__ ((l1_text));
+#endif
+
+/*
+ * irq_panic - calls panic with string setup
+ */
+asmlinkage void irq_panic(int reason, struct pt_regs *regs)
+{
+ int sig = 0;
+ siginfo_t info;
+
+#ifdef CONFIG_DEBUG_ICACHE_CHECK
+ unsigned int cmd, tag, ca, cache_hi, cache_lo, *pa;
+ unsigned short i, j, die;
+ unsigned int bad[10][6];
+
+ /* check entire cache for coherency
+ * Since printk is in cacheable memory,
+ * don't call it until you have checked everything
+ */
+
+ die = 0;
+ i = 0;
+
+ /* check icache */
+
+ for (ca = L1_ICACHE_START; ca <= L1_ICACHE_END && i < 10; ca += 32) {
+
+ /* Grab various address bits for the itest_cmd fields */
+ cmd = (((ca & 0x3000) << 4) | /* ca[13:12] for SBNK[1:0] */
+ ((ca & 0x0c00) << 16) | /* ca[11:10] for WAYSEL[1:0] */
+ ((ca & 0x3f8)) | /* ca[09:03] for SET[4:0] and DW[1:0] */
+ 0); /* Access Tag, Read access */
+
+ SSYNC();
+ bfin_write_ITEST_COMMAND(cmd);
+ SSYNC();
+ tag = bfin_read_ITEST_DATA0();
+ SSYNC();
+
+ /* if tag is marked as valid, check it */
+ if (tag & 1) {
+ /* The icache is arranged in 4 groups of 64-bits */
+ for (j = 0; j < 32; j += 8) {
+ cmd = ((((ca + j) & 0x3000) << 4) | /* ca[13:12] for SBNK[1:0] */
+ (((ca + j) & 0x0c00) << 16) | /* ca[11:10] for WAYSEL[1:0] */
+ (((ca + j) & 0x3f8)) | /* ca[09:03] for SET[4:0] and DW[1:0] */
+ 4); /* Access Data, Read access */
+
+ SSYNC();
+ bfin_write_ITEST_COMMAND(cmd);
+ SSYNC();
+
+ cache_hi = bfin_read_ITEST_DATA1();
+ cache_lo = bfin_read_ITEST_DATA0();
+
+ pa = ((unsigned int *)((tag & 0xffffcc00) |
+ ((ca + j) & ~(0xffffcc00))));
+
+ /*
+ * Debugging this, enable
+ *
+ * printk("addr: %08x %08x%08x | %08x%08x\n",
+ * ((unsigned int *)((tag & 0xffffcc00) | ((ca+j) & ~(0xffffcc00)))),
+ * cache_hi, cache_lo, *(pa+1), *pa);
+ */
+
+ if (cache_hi != *(pa + 1) || cache_lo != *pa) {
+ /* Since icache is not working, stay out of it, by not printing */
+ die = 1;
+ bad[i][0] = (ca + j);
+ bad[i][1] = cache_hi;
+ bad[i][2] = cache_lo;
+ bad[i][3] = ((tag & 0xffffcc00) |
+ ((ca + j) & ~(0xffffcc00)));
+ bad[i][4] = *(pa + 1);
+ bad[i][5] = *(pa);
+ i++;
+ }
+ }
+ }
+ }
+ if (die) {
+ printk(KERN_EMERG "icache coherency error\n");
+ for (j = 0; j <= i; j++) {
+ printk(KERN_EMERG
+ "cache address : %08x cache value : %08x%08x\n",
+ bad[j][0], bad[j][1], bad[j][2]);
+ printk(KERN_EMERG
+ "physical address: %08x SDRAM value : %08x%08x\n",
+ bad[j][3], bad[j][4], bad[j][5]);
+ }
+ panic("icache coherency error");
+ } else {
+ printk(KERN_EMERG "icache checked, and OK\n");
+ }
+#endif
+
+ printk(KERN_EMERG "\n");
+ printk(KERN_EMERG "Exception: IRQ 0x%x entered\n", reason);
+ printk(KERN_EMERG " code=[0x%08lx], stack frame=0x%08lx, "
+ " bad PC=0x%08lx\n",
+ (unsigned long)regs->seqstat,
+ (unsigned long)regs,
+ (unsigned long)regs->pc);
+ if (reason == 0x5) {
+ printk(KERN_EMERG "----------- HARDWARE ERROR -----------\n");
+
+ /* There is only need to check for Hardware Errors, since other
+ * EXCEPTIONS are handled in TRAPS.c (MH)
+ */
+ switch (regs->seqstat & SEQSTAT_HWERRCAUSE) {
+ case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR): /* System MMR Error */
+ info.si_code = BUS_ADRALN;
+ sig = SIGBUS;
+ printk(KERN_EMERG HWC_x2);
+ break;
+ case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR): /* External Memory Addressing Error */
+ info.si_code = BUS_ADRERR;
+ sig = SIGBUS;
+ printk(KERN_EMERG HWC_x3);
+ break;
+ case (SEQSTAT_HWERRCAUSE_PERF_FLOW): /* Performance Monitor Overflow */
+ printk(KERN_EMERG HWC_x12);
+ break;
+ case (SEQSTAT_HWERRCAUSE_RAISE_5): /* RAISE 5 instruction */
+ printk(KERN_EMERG HWC_x18);
+ break;
+ default: /* Reserved */
+ printk(KERN_EMERG HWC_default);
+ break;
+ }
+ }
+
+ regs->ipend = bfin_read_IPEND();
+ dump_bfin_regs(regs, (void *)regs->pc);
+ if (0 == (info.si_signo = sig) || 0 == user_mode(regs)) /* in kernelspace */
+ panic("Unhandled IRQ or exceptions!\n");
+ else { /* in userspace */
+ info.si_errno = 0;
+ info.si_addr = (void *)regs->pc;
+ force_sig_info(sig, &info, current);
+ }
+}
+
+#ifdef CONFIG_HARDWARE_PM
+/*
+ * call the handler of Performance overflow
+ */
+asmlinkage void pm_overflow(int irq, struct pt_regs *regs)
+{
+ pm_overflow_handler(irq, regs);
+}
+#endif
OpenPOWER on IntegriCloud