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>
diff --git a/lib_blackfin/cmd_cache_dump.c b/lib_blackfin/cmd_cache_dump.c
new file mode 100644
index 0000000..de5840e
--- /dev/null
+++ b/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]");