diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2012-01-09 16:01:00 +0000 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2012-01-09 16:01:00 +0000 |
| commit | a07613a54d700a974f3a4a657da78ef5d097315d (patch) | |
| tree | e4bc91713e02fa6d8f08b07de53ea8f905593dfa /arch/arm/kernel/tcm.c | |
| parent | 65db039bf7402f0a5b19cbf6dcff55ebea433b8b (diff) | |
| parent | 928a11ba36f999436915ea2b1eadf54301f93059 (diff) | |
Merge branch 'samsung/dt' into samsung/cleanup
Conflicts:
arch/arm/mach-s3c64xx/Makefile
arch/arm/mach-s5pc100/Makefile
arch/arm/mach-s5pv210/Makefile
Pull in previously resolved conflicts:
The Makefiles were reorganized in the "rmk/restart" series and modified
in the "samsung/cleanup series". This also pulls in the other conflict
resolutions from the restart series against the samsung/dt series.
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 30e302d33e0..01ec453bb92 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; |