Blackfin: decouple unrelated cache settings to get exact behavior

The current cache options don't really represent the hardware features.
They end up setting different aspects of the hardware so that the end
result is to turn on/off the cache.  Unfortunately, when we hit cache
problems with the hardware, it's difficult to test different settings to
root cause the problem.  The current settings also don't cleanly allow for
different caching behaviors with different regions of memory.

So split the configure options such that they properly reflect the settings
that are applied to the hardware.

Signed-off-by: Jie Zhang <jie.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 78 insertions, 18 deletions

diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index b2782eae31e1..8d7892820130 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -117,15 +117,49 @@ void __cpuinit bfin_setup_caches(unsigned int cpu)
 	 */
 #ifdef CONFIG_BFIN_ICACHE
 	printk(KERN_INFO "Instruction Cache Enabled for CPU%u\n", cpu);
+	printk(KERN_INFO "  External memory:"
+# ifdef CONFIG_BFIN_EXTMEM_ICACHEABLE
+	       " cacheable"
+# else
+	       " uncacheable"
+# endif
+	       " in instruction cache\n");
+	if (L2_LENGTH)
+		printk(KERN_INFO "  L2 SRAM        :"
+# ifdef CONFIG_BFIN_L2_ICACHEABLE
+		       " cacheable"
+# else
+		       " uncacheable"
+# endif
+		       " in instruction cache\n");
+
+#else
+	printk(KERN_INFO "Instruction Cache Disabled for CPU%u\n", cpu);
 #endif
+
 #ifdef CONFIG_BFIN_DCACHE
-	printk(KERN_INFO "Data Cache Enabled for CPU%u"
-# if defined CONFIG_BFIN_WB
-		" (write-back)"
-# elif defined CONFIG_BFIN_WT
-		" (write-through)"
+	printk(KERN_INFO "Data Cache Enabled for CPU%u\n", cpu);
+	printk(KERN_INFO "  External memory:"
+# if defined CONFIG_BFIN_EXTMEM_WRITEBACK
+	       " cacheable (write-back)"
+# elif defined CONFIG_BFIN_EXTMEM_WRITETHROUGH
+	       " cacheable (write-through)"
+# else
+	       " uncacheable"
+# endif
+	       " in data cache\n");
+	if (L2_LENGTH)
+		printk(KERN_INFO "  L2 SRAM        :"
+# if defined CONFIG_BFIN_L2_WRITEBACK
+		       " cacheable (write-back)"
+# elif defined CONFIG_BFIN_L2_WRITETHROUGH
+		       " cacheable (write-through)"
+# else
+		       " uncacheable"
 # endif
-		"\n", cpu);
+		       " in data cache\n");
+#else
+	printk(KERN_INFO "Data Cache Disabled for CPU%u\n", cpu);
 #endif
 }
 
@@ -516,7 +550,7 @@ static __init void memory_setup(void)
 	    && ((unsigned long *)mtd_phys)[1] == ROMSB_WORD1)
 		mtd_size =
 		    PAGE_ALIGN(be32_to_cpu(((unsigned long *)mtd_phys)[2]));
-#  if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
+#  if (defined(CONFIG_BFIN_EXTMEM_ICACHEABLE) && ANOMALY_05000263)
 	/* Due to a Hardware Anomaly we need to limit the size of usable
 	 * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
 	 * 05000263 - Hardware loop corrupted when taking an ICPLB exception
@@ -544,7 +578,7 @@ static __init void memory_setup(void)
 	dma_memcpy((void *)uclinux_ram_map.phys, _end, uclinux_ram_map.size);
 #endif				/* CONFIG_MTD_UCLINUX */
 
-#if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
+#if (defined(CONFIG_BFIN_EXTMEM_ICACHEABLE) && ANOMALY_05000263)
 	/* Due to a Hardware Anomaly we need to limit the size of usable
 	 * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
 	 * 05000263 - Hardware loop corrupted when taking an ICPLB exception
@@ -1158,16 +1192,25 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 		icache_size = 0;
 
 	seq_printf(m, "cache size\t: %d KB(L1 icache) "
-		"%d KB(L1 dcache%s) %d KB(L2 cache)\n",
-		icache_size, dcache_size,
-#if defined CONFIG_BFIN_WB
-		"-wb"
-#elif defined CONFIG_BFIN_WT
-		"-wt"
-#endif
-		"", 0);
-
+		"%d KB(L1 dcache) %d KB(L2 cache)\n",
+		icache_size, dcache_size, 0);
 	seq_printf(m, "%s\n", cache);
+	seq_printf(m, "external memory\t: "
+#if defined(CONFIG_BFIN_EXTMEM_ICACHEABLE)
+		   "cacheable"
+#else
+		   "uncacheable"
+#endif
+		   " in instruction cache\n");
+	seq_printf(m, "external memory\t: "
+#if defined(CONFIG_BFIN_EXTMEM_WRITEBACK)
+		      "cacheable (write-back)"
+#elif defined(CONFIG_BFIN_EXTMEM_WRITETHROUGH)
+		      "cacheable (write-through)"
+#else
+		      "uncacheable"
+#endif
+		      " in data cache\n");
 
 	if (icache_size)
 		seq_printf(m, "icache setup\t: %d Sub-banks/%d Ways, %d Lines/Way\n",
@@ -1240,8 +1283,25 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 	if (cpu_num != num_possible_cpus() - 1)
 		return 0;
 
-	if (L2_LENGTH)
+	if (L2_LENGTH) {
 		seq_printf(m, "L2 SRAM\t\t: %dKB\n", L2_LENGTH/0x400);
+		seq_printf(m, "L2 SRAM\t\t: "
+#if defined(CONFIG_BFIN_L2_ICACHEABLE)
+			      "cacheable"
+#else
+			      "uncacheable"
+#endif
+			      " in instruction cache\n");
+		seq_printf(m, "L2 SRAM\t\t: "
+#if defined(CONFIG_BFIN_L2_WRITEBACK)
+			      "cacheable (write-back)"
+#elif defined(CONFIG_BFIN_L2_WRITETHROUGH)
+			      "cacheable (write-through)"
+#else
+			      "uncacheable"
+#endif
+			      " in data cache\n");
+	}
 	seq_printf(m, "board name\t: %s\n", bfin_board_name);
 	seq_printf(m, "board memory\t: %ld kB (0x%p -> 0x%p)\n",
 		 physical_mem_end >> 10, (void *)0, (void *)physical_mem_end);