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 | 1 + lib_blackfin/cmd_cache_dump.c | 145 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 146 insertions(+), 0 deletions(-) create mode 100644 lib_blackfin/cmd_cache_dump.c
diff --git a/lib_blackfin/Makefile b/lib_blackfin/Makefile index e32ecc9..4bdf6d3 100644 --- a/lib_blackfin/Makefile +++ b/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 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]");