Blackfin: drop unused irq_panic()/DEBUG_ICACHE_CHECK

This code was useful during early port development when our icache code
wasn't solid, but that ship has sailed long ago, and no code calls this
function anymore (irq_panic).  So punt it.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

arch/blackfin/Kconfig.debug

@@ -102,17 +102,6 @@ config DEBUG_DOUBLEFAULT_RESET
 
 endchoice
 
-config DEBUG_ICACHE_CHECK
-	bool "Check Instruction cache coherency"
-	depends on DEBUG_KERNEL
-	depends on DEBUG_HWERR
-	help
-	  Say Y here if you are getting weird unexplained errors. This will
-	  ensure that icache is what SDRAM says it should be by doing a
-	  byte wise comparison between SDRAM and instruction cache. This
-	  also relocates the irq_panic() function to L1 memory, (which is
-	  un-cached).
-
 config DEBUG_HUNT_FOR_ZERO
 	bool "Catch NULL pointer reads/writes"
 	default y

arch/blackfin/mach-common/Makefile

@@ -11,4 +11,3 @@ obj-$(CONFIG_CPU_FREQ)    += cpufreq.o
 obj-$(CONFIG_CPU_VOLTAGE) += dpmc.o
 obj-$(CONFIG_SMP)         += smp.o
 obj-$(CONFIG_BFIN_KERNEL_CLOCK) += clocks-init.o
-obj-$(CONFIG_DEBUG_ICACHE_CHECK) += irqpanic.o

arch/blackfin/mach-common/irqpanic.c

-/*
- * panic kernel with dump information
- *
- * Copyright 2005-2009 Analog Devices Inc.
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <linux/module.h>
-#include <linux/kernel_stat.h>
-#include <linux/sched.h>
-#include <asm/blackfin.h>
-
-#define L1_ICACHE_START 0xffa10000
-#define L1_ICACHE_END   0xffa13fff
-
-/*
- * irq_panic - calls panic with string setup
- */
-__attribute__ ((l1_text))
-asmlinkage void irq_panic(int reason, struct pt_regs *regs)
-{
-	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");
-}