[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>

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"

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