zynq: move static peripheral mappings

Shifting them up into the vmalloc region prevents the following warning,
when booting a zynq qemu target with more than 512mb of RAM:

  BUG: mapping for 0xe0000000 at 0xe0000000 out of vmalloc space

In addition, it allows for reuse of these mappings when the proper
drivers issue requests via ioremap().

There are currently unknown issues with the early uart mapping.  For
now, the uart will be mapped to a known working address.

Signed-off-by: Josh Cartwright <josh.cartwright@ni.com>
Cc: John Linn <john.linn@xilinx.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Michal Simek <michal.simek@xilinx.com>

2 files changed, 18 insertions, 13 deletions

diff --git a/arch/arm/mach-zynq/common.c b/arch/arm/mach-zynq/common.c
index ba48f067d8f2..ba8d14f78d4d 100644
--- a/arch/arm/mach-zynq/common.c
+++ b/arch/arm/mach-zynq/common.c
@@ -73,12 +73,12 @@ static struct map_desc io_desc[] __initdata = {
         {
                 .virtual        = TTC0_VIRT,
                 .pfn            = __phys_to_pfn(TTC0_PHYS),
-                .length         = SZ_4K,
+                .length         = TTC0_SIZE,
                 .type           = MT_DEVICE,
         }, {
                 .virtual        = SCU_PERIPH_VIRT,
                 .pfn            = __phys_to_pfn(SCU_PERIPH_PHYS),
-                .length         = SZ_8K,
+                .length         = SCU_PERIPH_SIZE,
                 .type           = MT_DEVICE,
         },
 
@@ -86,7 +86,7 @@ static struct map_desc io_desc[] __initdata = {
         {
                 .virtual        = UART0_VIRT,
                 .pfn            = __phys_to_pfn(UART0_PHYS),
-                .length         = SZ_4K,
+                .length         = UART0_SIZE,
                 .type           = MT_DEVICE,
         },
 #endif
diff --git a/arch/arm/mach-zynq/include/mach/zynq_soc.h b/arch/arm/mach-zynq/include/mach/zynq_soc.h
index 218283a94247..1b8bf0ecbcb0 100644
--- a/arch/arm/mach-zynq/include/mach/zynq_soc.h
+++ b/arch/arm/mach-zynq/include/mach/zynq_soc.h
@@ -15,27 +15,32 @@
 #ifndef __MACH_XILINX_SOC_H__
 #define __MACH_XILINX_SOC_H__
 
+#include <asm/pgtable.h>
+
 #define PERIPHERAL_CLOCK_RATE           2500000
 
-/* For now, all mappings are flat (physical = virtual)
+/* Static peripheral mappings are mapped at the top of the vmalloc region.  The
+ * early uart mapping causes intermediate problems/failure at certain
+ * addresses, including the very top of the vmalloc region.  Map it at an
+ * address that is known to work.
  */
-#define UART0_PHYS                      0xE0000000
-#define UART0_VIRT                      UART0_PHYS
+#define UART0_PHYS              0xE0000000
+#define UART0_SIZE              SZ_4K
+#define UART0_VIRT              0xF0001000
 
-#define TTC0_PHYS                       0xF8001000
-#define TTC0_VIRT                       TTC0_PHYS
+#define TTC0_PHYS               0xF8001000
+#define TTC0_SIZE               SZ_4K
+#define TTC0_VIRT               (VMALLOC_END - TTC0_SIZE)
 
-#define SCU_PERIPH_PHYS                 0xF8F00000
-#define SCU_PERIPH_VIRT                 SCU_PERIPH_PHYS
+#define SCU_PERIPH_PHYS         0xF8F00000
+#define SCU_PERIPH_SIZE         SZ_8K
+#define SCU_PERIPH_VIRT         (TTC0_VIRT - SCU_PERIPH_SIZE)
 
 /* The following are intended for the devices that are mapped early */
 
 #define TTC0_BASE                       IOMEM(TTC0_VIRT)
 #define SCU_PERIPH_BASE                 IOMEM(SCU_PERIPH_VIRT)
 
-/*
- * Mandatory for CONFIG_LL_DEBUG, UART is mapped virtual = physical
- */
 #define LL_UART_PADDR   UART0_PHYS
 #define LL_UART_VADDR   UART0_VIRT