Blackfin: add cache_dump commands

A few debug-type commands used to dump the raw icache/dcache data.  Useful
when trying to track down cache-related bugs.

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

lib_blackfin/Makefile

@@ -40,6 +40,7 @@ COBJS-y	+= board.o
 COBJS-y	+= boot.o
 COBJS-y	+= cache.o
 COBJS-y	+= clocks.o
+COBJS-$(CONFIG_CMD_CACHE_DUMP) += cmd_cache_dump.o
 COBJS-y	+= muldi3.o
 COBJS-$(CONFIG_POST) += post.o tests.o
 COBJS-y	+= string.o

lib_blackfin/cmd_cache_dump.c

@@ -0,0 +1,145 @@
+/*
+ * U-boot - cmd_cache_dump.c
+ *
+ * Copyright (c) 2007-2008 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <config.h>
+#include <common.h>
+#include <command.h>
+
+#include <asm/blackfin.h>
+#include <asm/mach-common/bits/mpu.h>
+
+static int check_limit(const char *type, size_t start_limit, size_t end_limit, size_t start, size_t end)
+{
+	if (start >= start_limit && start <= end_limit && \
+	    end <= end_limit && end >= start_limit && \
+	    start <= end)
+		return 0;
+
+	printf("%s limit violation: %zu <= (user:%zu) <= (user:%zu) <= %zu\n",
+		type, start_limit, start, end, end_limit);
+	return 1;
+}
+
+int do_icache_dump(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	int cache_status = icache_status();
+
+	if (cache_status)
+		icache_disable();
+
+	uint32_t cmd_base, tag, cache_upper, cache_lower;
+
+	size_t way, way_start = 0, way_end = 3;
+	size_t sbnk, sbnk_start = 0, sbnk_end = 3;
+	size_t set, set_start = 0, set_end = 31;
+	size_t dw;
+
+	if (argc > 1) {
+		way_start = way_end = simple_strtoul(argv[1], NULL, 10);
+		if (argc > 2) {
+			sbnk_start = sbnk_end = simple_strtoul(argv[2], NULL, 10);
+			if (argc > 3)
+				set_start = set_end = simple_strtoul(argv[3], NULL, 10);
+		}
+	}
+
+	if (check_limit("way", 0, 3, way_start, way_end) || \
+	    check_limit("subbank", 0, 3, sbnk_start, sbnk_end) || \
+	    check_limit("set", 0, 31, set_start, set_end))
+		return 1;
+
+	puts("Way:Subbank:Set: [valid-tag lower upper] {invalid-tag lower upper}...\n");
+
+	for (way = way_start; way <= way_end; ++way) {
+		for (sbnk = sbnk_start; sbnk <= sbnk_end; ++sbnk) {
+			for (set = set_start; set <= set_end; ++set) {
+				printf("%zu:%zu:%2zu: ", way, sbnk, set);
+				for (dw = 0; dw < 4; ++dw) {
+					if (ctrlc())
+						return 1;
+
+					cmd_base = \
+						(way  << 26) | \
+						(sbnk << 16) | \
+						(set  <<  5) | \
+						(dw   <<  3);
+
+					/* first read the tag */
+					bfin_write_ITEST_COMMAND(cmd_base | 0x0);
+					SSYNC();
+					tag = bfin_read_ITEST_DATA0();
+					printf("%c%08x ", (tag & 0x1 ? ' ' : '{'), tag);
+
+					/* grab the data at this loc */
+					bfin_write_ITEST_COMMAND(cmd_base | 0x4);
+					SSYNC();
+					cache_lower = bfin_read_ITEST_DATA0();
+					cache_upper = bfin_read_ITEST_DATA1();
+					printf("%08x %08x%c ", cache_lower, cache_upper, (tag & 0x1 ? ' ' : '}'));
+				}
+				puts("\n");
+			}
+		}
+	}
+
+	if (cache_status)
+		icache_enable();
+
+	return 0;
+}
+
+U_BOOT_CMD(icache_dump, 4, 0, do_icache_dump,
+	"icache_dump - dump current instruction cache\n",
+	"[way] [subbank] [set]");
+
+int do_dcache_dump(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	u32 way, bank, subbank, set;
+	u32 status, addr;
+	u32 dmem_ctl = bfin_read_DMEM_CONTROL();
+
+	for (bank = 0; bank < 2; ++bank) {
+		if (!(dmem_ctl & (1 << (DMC1_P - bank))))
+			continue;
+
+		for (way = 0; way < 2; ++way)
+			for (subbank = 0; subbank < 4; ++subbank) {
+				printf("%i:%i:%i:\t", bank, way, subbank);
+				for (set = 0; set < 64; ++set) {
+
+					if (ctrlc())
+						return 1;
+
+					/* retrieve a cache tag */
+					bfin_write_DTEST_COMMAND(
+						way << 26 |
+						bank << 23 |
+						subbank << 16 |
+						set << 5
+					);
+					CSYNC();
+					status = bfin_read_DTEST_DATA0();
+
+					/* construct the address using the tag */
+					addr = (status & 0xFFFFC800) | (subbank << 12) | (set << 5);
+
+					/* show it */
+					if (set && !(set % 4))
+						puts("\n\t");
+					printf("%c%08x%c%08x%c ", (status & 0x1 ? '[' : '{'), status, (status & 0x2 ? 'd' : ' '), addr, (status & 0x1 ? ']' : '}'));
+				}
+				puts("\n");
+			}
+	}
+
+	return 0;
+}
+
+U_BOOT_CMD(dcache_dump, 4, 0, do_dcache_dump,
+	"dcache_dump - dump current data cache\n",
+	"[bank] [way] [subbank] [set]");