ARM: mach-shmobile: r8a7779 map_io and init_early update

Update the r8a7779 SoC and the Marzen board to make use of
the functions r8a7779_map_io() and r8a7779_add_early_devices().

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

1 files changed, 39 insertions, 0 deletions

diff --git a/arch/arm/mach-shmobile/setup-r8a7779.c b/arch/arm/mach-shmobile/setup-r8a7779.c
index 4725663bd032..4378b4dea1dc 100644
--- a/arch/arm/mach-shmobile/setup-r8a7779.c
+++ b/arch/arm/mach-shmobile/setup-r8a7779.c
@@ -33,6 +33,29 @@
 #include <mach/common.h>
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+
+static struct map_desc r8a7779_io_desc[] __initdata = {
+        /* 2M entity map for 0xf0000000 (MPCORE) */
+        {
+                .virtual        = 0xf0000000,
+                .pfn            = __phys_to_pfn(0xf0000000),
+                .length         = SZ_2M,
+                .type           = MT_DEVICE_NONSHARED
+        },
+        /* 16M entity map for 0xfexxxxxx (DMAC-S/HPBREG/INTC2/LRAM/DBSC) */
+        {
+                .virtual        = 0xfe000000,
+                .pfn            = __phys_to_pfn(0xfe000000),
+                .length         = SZ_16M,
+                .type           = MT_DEVICE_NONSHARED
+        },
+};
+
+void __init r8a7779_map_io(void)
+{
+        iotable_init(r8a7779_io_desc, ARRAY_SIZE(r8a7779_io_desc));
+}
 
 static struct plat_sci_port scif0_platform_data = {
         .mapbase        = 0xffe40000,
@@ -236,4 +259,20 @@ void __init r8a7779_add_early_devices(void)
 {
         early_platform_add_devices(r8a7779_early_devices,
                                    ARRAY_SIZE(r8a7779_early_devices));
+
+        /* Early serial console setup is not included here due to
+         * memory map collisions. The SCIF serial ports in r8a7779
+         * are difficult to entity map 1:1 due to collision with the
+         * virtual memory range used by the coherent DMA code on ARM.
+         *
+         * Anyone wanting to debug early can remove UPF_IOREMAP from
+         * the sh-sci serial console platform data, adjust mapbase
+         * to a static M:N virt:phys mapping that needs to be added to
+         * the mappings passed with iotable_init() above.
+         *
+         * Then add a call to shmobile_setup_console() from this function.
+         *
+         * As a final step pass earlyprint=sh-sci.2,115200 on the kernel
+         * command line in case of the marzen board.
+         */
 }