[ARM] 3234/1: Update cpu_architecture() to deal with the new ID format

Patch from Catalin Marinas

Since ARM1176, the CPU ID format has changed and it will also be used for
future ARM architectures.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 9 insertions, 6 deletions

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 2cab741ad0f8..c45d10d07bde 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -205,7 +205,7 @@ static const char *proc_arch[] = {
         "5TE",
         "5TEJ",
         "6TEJ",
-        "?(10)",
+        "7",
         "?(11)",
         "?(12)",
         "?(13)",
@@ -258,14 +258,17 @@ int cpu_architecture(void)
 {
         int cpu_arch;
 
-        if ((processor_id & 0x0000f000) == 0) {
+        if ((processor_id & 0x0008f000) == 0) {
                 cpu_arch = CPU_ARCH_UNKNOWN;
-        } else if ((processor_id & 0x0000f000) == 0x00007000) {
+        } else if ((processor_id & 0x0008f000) == 0x00007000) {
                 cpu_arch = (processor_id & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
-        } else {
+        } else if ((processor_id & 0x00080000) == 0x00000000) {
                 cpu_arch = (processor_id >> 16) & 7;
                 if (cpu_arch)
                         cpu_arch += CPU_ARCH_ARMv3;
+        } else {
+                /* the revised CPUID */
+                cpu_arch = ((processor_id >> 12) & 0xf) - 0xb + CPU_ARCH_ARMv6;
         }
 
         return cpu_arch;
@@ -863,11 +866,11 @@ static int c_show(struct seq_file *m, void *v)
         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", processor_id >> 24);
         seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
 
-        if ((processor_id & 0x0000f000) == 0x00000000) {
+        if ((processor_id & 0x0008f000) == 0x00000000) {
                 /* pre-ARM7 */
                 seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4);
         } else {
-                if ((processor_id & 0x0000f000) == 0x00007000) {
+                if ((processor_id & 0x0008f000) == 0x00007000) {
                         /* ARM7 */
                         seq_printf(m, "CPU variant\t: 0x%02x\n",
                                    (processor_id >> 16) & 127);