MIPS: Netlogic: Add support for XLP2XX

XLP2XX is first in the series of 28nm XLPII processors.

The changes are to:
* Add processor ID for XLP2XX to asm/cpu.h and kernel/cpu-probe.c.
* Add a cpu_is_xlpii() function to check for XLPII processors.
* Update xlp_mmu_init() to use config4 to enable extended TLB.

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5698/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 20 insertions, 7 deletions

diff --git a/arch/mips/netlogic/xlp/setup.c b/arch/mips/netlogic/xlp/setup.c
index 7718368e4598..76a7131e486e 100644
--- a/arch/mips/netlogic/xlp/setup.c
+++ b/arch/mips/netlogic/xlp/setup.c
@@ -110,7 +110,12 @@ void __init plat_mem_setup(void)
 
 const char *get_system_type(void)
 {
-        return "Netlogic XLP Series";
+        switch (read_c0_prid() & 0xff00) {
+        case PRID_IMP_NETLOGIC_XLP2XX:
+                return "Broadcom XLPII Series";
+        default:
+                return "Netlogic XLP Series";
+        }
 }
 
 void __init prom_free_prom_memory(void)
@@ -120,12 +125,20 @@ void __init prom_free_prom_memory(void)
 
 void xlp_mmu_init(void)
 {
-        /* enable extended TLB and Large Fixed TLB */
-        write_c0_config6(read_c0_config6() | 0x24);
-
-        /* set page mask of Fixed TLB in config7 */
-        write_c0_config7(PM_DEFAULT_MASK >>
-                (13 + (ffz(PM_DEFAULT_MASK >> 13) / 2)));
+        u32 conf4;
+
+        if (cpu_is_xlpii()) {
+                /* XLPII series has extended pagesize in config 4 */
+                conf4 = read_c0_config4() & ~0x1f00u;
+                write_c0_config4(conf4 | ((PAGE_SHIFT - 10) / 2 << 8));
+        } else {
+                /* enable extended TLB and Large Fixed TLB */
+                write_c0_config6(read_c0_config6() | 0x24);
+
+                /* set page mask of extended Fixed TLB in config7 */
+                write_c0_config7(PM_DEFAULT_MASK >>
+                        (13 + (ffz(PM_DEFAULT_MASK >> 13) / 2)));
+        }
 }
 
 void nlm_percpu_init(int hwcpuid)