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Diffstat (limited to 'arch/arm/kernel/tcm.c')
-rw-r--r--arch/arm/kernel/tcm.c22
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;