RealView: Allow PHYS_OFFSET at 0x70000000

RealView boards like PB11MPCore have 512MB of RAM available contiguously
at 0x70000000. Half of the memory is mirrored at 0x00000000 for
backwards compatibility. This patch adds the
CONFIG_REALVIEW_HIGH_PHYS_OFFSET option option to change the physical
base address so that the full amount of RAM is available to Linux. Note
that the EB board has 256MB of RAM also mirrored at 0x70000000, the only
board without this feature being PB1176.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

6 files changed, 24 insertions, 4 deletions

diff --git a/arch/arm/mach-realview/Kconfig b/arch/arm/mach-realview/Kconfig
index 5ccde7cf39e8..6695fb33afbf 100644
--- a/arch/arm/mach-realview/Kconfig
+++ b/arch/arm/mach-realview/Kconfig
@@ -37,4 +37,15 @@ config MACH_REALVIEW_PB1176
         help
           Include support for the ARM(R) RealView ARM1176 Platform Baseboard.
 
+config REALVIEW_HIGH_PHYS_OFFSET
+        bool "High physical base address for the RealView platform"
+        depends on !MACH_REALVIEW_PB1176
+        default y
+        help
+          RealView boards other than PB1176 have the RAM available at
+          0x70000000, 256MB of which being mirrored at 0x00000000. If
+          the board supports 512MB of RAM, this option allows the
+          memory to be accessed contiguously at the high physical
+          offset.
+
 endmenu
diff --git a/arch/arm/mach-realview/Makefile.boot b/arch/arm/mach-realview/Makefile.boot
index c7e75acfe6c9..d97e003d3df4 100644
--- a/arch/arm/mach-realview/Makefile.boot
+++ b/arch/arm/mach-realview/Makefile.boot
@@ -1,4 +1,9 @@
+ifeq ($(CONFIG_REALVIEW_HIGH_PHYS_OFFSET),y)
+   zreladdr-y   := 0x70008000
+params_phys-y   := 0x70000100
+initrd_phys-y   := 0x70800000
+else
    zreladdr-y   := 0x00008000
 params_phys-y   := 0x00000100
 initrd_phys-y   := 0x00800000
-
+endif
diff --git a/arch/arm/mach-realview/include/mach/memory.h b/arch/arm/mach-realview/include/mach/memory.h
index 0e673483a141..759ed10d74fe 100644
--- a/arch/arm/mach-realview/include/mach/memory.h
+++ b/arch/arm/mach-realview/include/mach/memory.h
@@ -23,7 +23,11 @@
 /*
  * Physical DRAM offset.
  */
+#ifdef CONFIG_REALVIEW_HIGH_PHYS_OFFSET
+#define PHYS_OFFSET             UL(0x70000000)
+#else
 #define PHYS_OFFSET             UL(0x00000000)
+#endif
 
 /*
  * Virtual view <-> DMA view memory address translations
diff --git a/arch/arm/mach-realview/realview_eb.c b/arch/arm/mach-realview/realview_eb.c
index eb829eb1ebe2..f6e04edf922d 100644
--- a/arch/arm/mach-realview/realview_eb.c
+++ b/arch/arm/mach-realview/realview_eb.c
@@ -392,7 +392,7 @@ MACHINE_START(REALVIEW_EB, "ARM-RealView EB")
         /* Maintainer: ARM Ltd/Deep Blue Solutions Ltd */
         .phys_io        = REALVIEW_EB_UART0_BASE,
         .io_pg_offst    = (IO_ADDRESS(REALVIEW_EB_UART0_BASE) >> 18) & 0xfffc,
-        .boot_params    = 0x00000100,
+        .boot_params    = PHYS_OFFSET + 0x00000100,
         .map_io         = realview_eb_map_io,
         .init_irq       = gic_init_irq,
         .timer          = &realview_eb_timer,
diff --git a/arch/arm/mach-realview/realview_pb1176.c b/arch/arm/mach-realview/realview_pb1176.c
index cccdb3eb90fe..a9fac653b305 100644
--- a/arch/arm/mach-realview/realview_pb1176.c
+++ b/arch/arm/mach-realview/realview_pb1176.c
@@ -284,7 +284,7 @@ MACHINE_START(REALVIEW_PB1176, "ARM-RealView PB1176")
         /* Maintainer: ARM Ltd/Deep Blue Solutions Ltd */
         .phys_io        = REALVIEW_PB1176_UART0_BASE,
         .io_pg_offst    = (IO_ADDRESS(REALVIEW_PB1176_UART0_BASE) >> 18) & 0xfffc,
-        .boot_params    = 0x00000100,
+        .boot_params    = PHYS_OFFSET + 0x00000100,
         .map_io         = realview_pb1176_map_io,
         .init_irq       = gic_init_irq,
         .timer          = &realview_pb1176_timer,
diff --git a/arch/arm/mach-realview/realview_pb11mp.c b/arch/arm/mach-realview/realview_pb11mp.c
index 8b863148ec18..8a27cd0a4741 100644
--- a/arch/arm/mach-realview/realview_pb11mp.c
+++ b/arch/arm/mach-realview/realview_pb11mp.c
@@ -334,7 +334,7 @@ MACHINE_START(REALVIEW_PB11MP, "ARM-RealView PB11MPCore")
         /* Maintainer: ARM Ltd/Deep Blue Solutions Ltd */
         .phys_io        = REALVIEW_PB11MP_UART0_BASE,
         .io_pg_offst    = (IO_ADDRESS(REALVIEW_PB11MP_UART0_BASE) >> 18) & 0xfffc,
-        .boot_params    = 0x00000100,
+        .boot_params    = PHYS_OFFSET + 0x00000100,
         .map_io         = realview_pb11mp_map_io,
         .init_irq       = gic_init_irq,
         .timer          = &realview_pb11mp_timer,