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author | Arnd Bergmann <arnd@arndb.de> | 2012-01-07 12:30:20 +0000 |
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committer | Arnd Bergmann <arnd@arndb.de> | 2012-01-07 12:42:17 +0000 |
commit | 237c78beb8a988453bac1993d21f025d070a0d8d (patch) | |
tree | 9864f0924650770881141359a2d5bac623949789 /arch/arm/kernel/tcm.c | |
parent | 4eb821999086417ab42a15174b51497122fc406e (diff) | |
parent | 7b9dd47136c07ffd883aff6926c7b281e4c1eea4 (diff) | |
download | blackbird-op-linux-237c78beb8a988453bac1993d21f025d070a0d8d.tar.gz blackbird-op-linux-237c78beb8a988453bac1993d21f025d070a0d8d.zip |
Merge branch 'depends/rmk/for-linus' into samsung/dt
Conflicts:
arch/arm/mach-exynos/Makefile
arch/arm/mach-exynos/cpu.c -> common.c
arch/arm/mach-exynos/include/mach/entry-macro.S
arch/arm/mach-exynos/init.c -> common.c
arch/arm/mach-s5p64x0/init.c -> common.c
arch/arm/mach-s5pv210/init.c -> common.c
Multiple files were moved into common.c files in the rmk/for-linus
branch, so this moves over the samsung/dt changes to the new
files.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arm/kernel/tcm.c')
-rw-r--r-- | arch/arm/kernel/tcm.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/arch/arm/kernel/tcm.c b/arch/arm/kernel/tcm.c index 30e302d33e0a..01ec453bb924 100644 --- a/arch/arm/kernel/tcm.c +++ b/arch/arm/kernel/tcm.c @@ -180,9 +180,9 @@ static int __init setup_tcm_bank(u8 type, u8 bank, u8 banks, */ void __init tcm_init(void) { - u32 tcm_status = read_cpuid_tcmstatus(); - u8 dtcm_banks = (tcm_status >> 16) & 0x03; - u8 itcm_banks = (tcm_status & 0x03); + u32 tcm_status; + u8 dtcm_banks; + u8 itcm_banks; size_t dtcm_code_sz = &__edtcm_data - &__sdtcm_data; size_t itcm_code_sz = &__eitcm_text - &__sitcm_text; char *start; @@ -191,6 +191,22 @@ void __init tcm_init(void) int ret; int i; + /* + * Prior to ARMv5 there is no TCM, and trying to read the status + * register will hang the processor. + */ + if (cpu_architecture() < CPU_ARCH_ARMv5) { + if (dtcm_code_sz || itcm_code_sz) + pr_info("CPU TCM: %u bytes of DTCM and %u bytes of " + "ITCM code compiled in, but no TCM present " + "in pre-v5 CPU\n", dtcm_code_sz, itcm_code_sz); + return; + } + + tcm_status = read_cpuid_tcmstatus(); + dtcm_banks = (tcm_status >> 16) & 0x03; + itcm_banks = (tcm_status & 0x03); + /* Values greater than 2 for D/ITCM banks are "reserved" */ if (dtcm_banks > 2) dtcm_banks = 0; |