[ARM] Feroceon: support old cores with ARM926 ID

This enables the usage of some old Feroceon cores
for which the CPU ID is equal to the ARM926 ID.
Relevant for Feroceon-1850 and old Feroceon-2850.

Signed-off-by: Tzachi Perelstein <tzachi@marvell.com>
Signed-off-by: Nicolas Pitre <nico@marvell.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 36 insertions, 0 deletions

diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 378fb744abe2..9cdc74f94b11 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -354,6 +354,15 @@ config CPU_FEROCEON
         select CPU_COPY_V4WB if MMU
         select CPU_TLB_V4WBI if MMU
 
+config CPU_FEROCEON_OLD_ID
+        bool "Accept early Feroceon cores with an ARM926 ID"
+        depends on CPU_FEROCEON && !CPU_ARM926T
+        default y
+        help
+          This enables the usage of some old Feroceon cores
+          for which the CPU ID is equal to the ARM926 ID.
+          Relevant for Feroceon-1850 and early Feroceon-2850.
+
 # ARMv6
 config CPU_V6
         bool "Support ARM V6 processor"
diff --git a/arch/arm/mm/proc-feroceon.S b/arch/arm/mm/proc-feroceon.S
index 8ad341af7906..fa0dc7e6f0ea 100644
--- a/arch/arm/mm/proc-feroceon.S
+++ b/arch/arm/mm/proc-feroceon.S
@@ -453,6 +453,33 @@ cpu_feroceon_name:
 
         .section ".proc.info.init", #alloc, #execinstr
 
+#ifdef CONFIG_CPU_FEROCEON_OLD_ID
+        .type   __feroceon_old_id_proc_info,#object
+__feroceon_old_id_proc_info:
+        .long   0x41069260
+        .long   0xfffffff0
+        .long   PMD_TYPE_SECT | \
+                PMD_SECT_BUFFERABLE | \
+                PMD_SECT_CACHEABLE | \
+                PMD_BIT4 | \
+                PMD_SECT_AP_WRITE | \
+                PMD_SECT_AP_READ
+        .long   PMD_TYPE_SECT | \
+                PMD_BIT4 | \
+                PMD_SECT_AP_WRITE | \
+                PMD_SECT_AP_READ
+        b       __feroceon_setup
+        .long   cpu_arch_name
+        .long   cpu_elf_name
+        .long   HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
+        .long   cpu_feroceon_name
+        .long   feroceon_processor_functions
+        .long   v4wbi_tlb_fns
+        .long   v4wb_user_fns
+        .long   feroceon_cache_fns
+        .size   __feroceon_old_id_proc_info, . - __feroceon_old_id_proc_info
+#endif
+
         .type   __feroceon_proc_info,#object
 __feroceon_proc_info:
         .long   0x56055310