arch/arm: Add armv7-r configuration

This change adds armv7-r support for all stages.

armv7-r is an ARM processor based on the Cortex-R series.

Currently, there is support for armv7-a and armv7-m and
armv7-a files has been modfied to accommodate armv7-r by
adding ENV_ARMV7_A, ENV_ARMV7_R and ENV_ARMV7_M constants
to src/include/rules.h.

armv7-r exceptions support will added in a later time.

Change-Id: If94415d07fd6bd96c43d087374f609a2211f1885
Signed-off-by: Hakim Giydan <hgiydan@marvell.com>
Reviewed-on: https://review.coreboot.org/15335
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

4 files changed, 84 insertions, 3 deletions

diff --git a/src/arch/arm/armv7/Kconfig b/src/arch/arm/armv7/Kconfig
index 0ab3542fff..3734426c0f 100644
--- a/src/arch/arm/armv7/Kconfig
+++ b/src/arch/arm/armv7/Kconfig
@@ -19,3 +19,19 @@ config ARCH_BOOTBLOCK_ARMV7_M
 config ARCH_VERSTAGE_ARMV7_M
 	def_bool n
 	select ARCH_VERSTAGE_ARM
+
+config ARCH_BOOTBLOCK_ARMV7_R
+	def_bool n
+	select ARCH_BOOTBLOCK_ARM
+
+config ARCH_VERSTAGE_ARMV7_R
+	def_bool n
+	select ARCH_VERSTAGE_ARM
+
+config ARCH_ROMSTAGE_ARMV7_R
+	def_bool n
+	select ARCH_ROMSTAGE_ARM
+
+config ARCH_RAMSTAGE_ARMV7_R
+	def_bool n
+	select ARCH_RAMSTAGE_ARM
diff --git a/src/arch/arm/armv7/Makefile.inc b/src/arch/arm/armv7/Makefile.inc
index 2e9c49cbe2..d978f00fae 100644
--- a/src/arch/arm/armv7/Makefile.inc
+++ b/src/arch/arm/armv7/Makefile.inc
@@ -16,10 +16,12 @@
 ###############################################################################
 
 armv7_flags = -mthumb -I$(src)/arch/arm/include/armv7/ -D__COREBOOT_ARM_ARCH__=7
-armv7-a_flags = -march=armv7-a $(armv7_flags)
-armv7-m_flags = -march=armv7-m $(armv7_flags)
+armv7-a_flags = -march=armv7-a $(armv7_flags) -D__COREBOOT_ARM_V7_A__
+armv7-m_flags = -march=armv7-m $(armv7_flags) -D__COREBOOT_ARM_V7_M__
+armv7-r_flags = -march=armv7-r $(armv7_flags) -D__COREBOOT_ARM_V7_R__
 
 armv7_asm_flags = -Wa,-mthumb -Wa,-mimplicit-it=always -Wa,-mno-warn-deprecated
+armv7-r_asm_flags = $(armv7-r_flags) $(armv7_asm_flags)
 
 ###############################################################################
 # bootblock
@@ -46,9 +48,22 @@ bootblock-S-ccopts += $(armv7_asm_flags)
 ifneq ($(CONFIG_BOOTBLOCK_CUSTOM),y)
 bootblock-y += bootblock_m.S
 endif
-bootblock-y += exception_m.c
+bootblock-y += exception_mr.c
 bootblock-y += cache_m.c
 
+else ifeq ($(CONFIG_ARCH_BOOTBLOCK_ARMV7_R),y)
+bootblock-generic-ccopts += $(armv7-r_flags)
+bootblock-S-ccopts += $(armv7-r_asm_flags)
+
+ifneq ($(CONFIG_BOOTBLOCK_CUSTOM),y)
+bootblock-y += bootblock.S
+endif
+
+bootblock-y += cache.c
+bootblock-y += cpu.S
+bootblock-y += exception_mr.c
+bootblock-y += mmu.c
+
 endif # CONFIG_ARCH_BOOTBLOCK_ARMV7
 
 ################################################################################
@@ -73,6 +88,17 @@ libverstage-S-ccopts += $(armv7_asm_flags)
 verstage-generic-ccopts += $(armv7-m_flags)
 verstage-S-ccopts += $(armv7_asm_flags)
 
+else ifeq ($(CONFIG_ARCH_VERSTAGE_ARMV7_R),y)
+libverstage-generic-ccopts += $(armv7-r_flags)
+libverstage-S-ccopts += $(armv7-r_asm_flags)
+verstage-generic-ccopts += $(armv7-r_flags)
+verstage-S-ccopts += $(armv7-r_asm_flags)
+
+verstage-y += cache.c
+verstage-y += cpu.S
+verstage-y += exception_mr.c
+verstage-y += mmu.c
+
 endif # CONFIG_ARCH_VERSTAGE_ARMV7_M
 
 ################################################################################
@@ -91,6 +117,18 @@ romstage-S-ccopts += $(armv7_asm_flags)
 rmodules_arm-generic-ccopts += $(armv7-a_flags)
 rmodules_arm-S-ccopts += $(armv7_asm_flags)
 
+else ifeq ($(CONFIG_ARCH_ROMSTAGE_ARMV7_R),y)
+romstage-y += cache.c
+romstage-y += cpu.S
+romstage-y += exception_mr.c
+romstage-y += mmu.c
+
+romstage-generic-ccopts += $(armv7-r_flags)
+romstage-S-ccopts += $(armv7-r_asm_flags)
+
+rmodules_arm-generic-ccopts += $(armv7-r_flags)
+rmodules_arm-S-ccopts += $(armv7-r_asm_flags)
+
 endif # CONFIG_ARCH_ROMSTAGE_ARMV7
 
 ###############################################################################
@@ -111,4 +149,19 @@ ramstage-S-ccopts += $(armv7_asm_flags)
 # All rmodule code is armv7 if ramstage is armv7.
 rmodules_arm-generic-ccopts += $(armv7-a_flags)
 rmodules_arm-S-ccopts += $(armv7_asm_flags)
+
+else ifeq ($(CONFIG_ARCH_RAMSTAGE_ARMV7_R),y)
+
+ramstage-y += cache.c
+ramstage-y += cpu.S
+ramstage-y += exception_mr.c
+ramstage-y += mmu.c
+
+ramstage-generic-ccopts += $(armv7-r_flags)
+ramstage-S-ccopts += $(armv7-r_asm_flags)
+
+# All rmodule code is armv7 if ramstage is armv7.
+rmodules_arm-generic-ccopts += $(armv7-r_flags)
+rmodules_arm-S-ccopts += $(armv7-r_asm_flags)
+
 endif # CONFIG_ARCH_RAMSTAGE_ARMV7
diff --git a/src/arch/arm/armv7/cpu.S b/src/arch/arm/armv7/cpu.S
index 6c00f62582..21a16d27ab 100644
--- a/src/arch/arm/armv7/cpu.S
+++ b/src/arch/arm/armv7/cpu.S
@@ -31,6 +31,7 @@
  */
 
 #include <arch/asm.h>
+#include <rules.h>
 
 /*
  * Dcache invalidations by set/way work by passing a [way:sbz:set:sbz:level:0]
@@ -126,6 +127,7 @@ ENTRY(arm_init_caches)
 	/* Flush and invalidate dcache in ascending order */
 	bl	dcache_invalidate_all
 
+#if ENV_ARMV7_A
 	/* Deactivate MMU (0), Alignment Check (1) and DCache (2) */
 	and	r4, # ~(1 << 0) & ~(1 << 1) & ~(1 << 2)
 	mcr	p15, 0, r4, c1, c0, 0
@@ -133,6 +135,16 @@ ENTRY(arm_init_caches)
 	/* Invalidate icache and TLB for good measure */
 	mcr	p15, 0, r0, c7, c5, 0
 	mcr	p15, 0, r0, c8, c7, 0
+#endif
+
+#if ENV_ARMV7_R
+	/* Deactivate Alignment Check (1) and DCache (2) */
+	and	r4, # ~(1 << 1) & ~(1 << 2)
+	mcr	p15, 0, r4, c1, c0, 0
+
+	/* Invalidate icache for good measure */
+	mcr	p15, 0, r0, c7, c5, 0
+#endif
 	dsb
 	isb
 
diff --git a/src/arch/arm/armv7/exception_m.c b/src/arch/arm/armv7/exception_mr.c
index d76cc6a739..d76cc6a739 100644
--- a/src/arch/arm/armv7/exception_m.c
+++ b/src/arch/arm/armv7/exception_mr.c