arm: zynq: Load scu baseaddress at run time

Use Cortex a9 cp15 to read scu baseaddress.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

2 files changed, 24 insertions, 12 deletions

diff --git a/arch/arm/mach-zynq/common.c b/arch/arm/mach-zynq/common.c
index 68e0907de5d0..f9e5f3ac8eec 100644
--- a/arch/arm/mach-zynq/common.c
+++ b/arch/arm/mach-zynq/common.c
@@ -33,10 +33,13 @@
 #include <asm/mach-types.h>
 #include <asm/page.h>
 #include <asm/pgtable.h>
+#include <asm/smp_scu.h>
 #include <asm/hardware/cache-l2x0.h>
 
 #include "common.h"
 
+void __iomem *zynq_scu_base;
+
 static struct of_device_id zynq_of_bus_ids[] __initdata = {
         { .compatible = "simple-bus", },
         {}
@@ -56,17 +59,6 @@ static void __init xilinx_init_machine(void)
         of_platform_bus_probe(NULL, zynq_of_bus_ids, NULL);
 }
 
-#define SCU_PERIPH_PHYS         0xF8F00000
-#define SCU_PERIPH_SIZE         SZ_8K
-#define SCU_PERIPH_VIRT         (VMALLOC_END - SCU_PERIPH_SIZE)
-
-static struct map_desc scu_desc __initdata = {
-        .virtual        = SCU_PERIPH_VIRT,
-        .pfn            = __phys_to_pfn(SCU_PERIPH_PHYS),
-        .length         = SCU_PERIPH_SIZE,
-        .type           = MT_DEVICE,
-};
-
 static void __init xilinx_zynq_timer_init(void)
 {
         struct device_node *np;
@@ -81,13 +73,31 @@ static void __init xilinx_zynq_timer_init(void)
         clocksource_of_init();
 }
 
+static struct map_desc zynq_cortex_a9_scu_map __initdata = {
+        .length = SZ_256,
+        .type   = MT_DEVICE,
+};
+
+static void __init zynq_scu_map_io(void)
+{
+        unsigned long base;
+
+        base = scu_a9_get_base();
+        zynq_cortex_a9_scu_map.pfn = __phys_to_pfn(base);
+        /* Expected address is in vmalloc area that's why simple assign here */
+        zynq_cortex_a9_scu_map.virtual = base;
+        iotable_init(&zynq_cortex_a9_scu_map, 1);
+        zynq_scu_base = (void __iomem *)base;
+        BUG_ON(!zynq_scu_base);
+}
+
 /**
  * xilinx_map_io() - Create memory mappings needed for early I/O.
  */
 static void __init xilinx_map_io(void)
 {
         debug_ll_io_init();
-        iotable_init(&scu_desc, 1);
+        zynq_scu_map_io();
 }
 
 static const char *xilinx_dt_match[] = {
diff --git a/arch/arm/mach-zynq/common.h b/arch/arm/mach-zynq/common.h
index 5050bb10bb12..d7164d50cffe 100644
--- a/arch/arm/mach-zynq/common.h
+++ b/arch/arm/mach-zynq/common.h
@@ -17,4 +17,6 @@
 #ifndef __MACH_ZYNQ_COMMON_H__
 #define __MACH_ZYNQ_COMMON_H__
 
+extern void __iomem *zynq_scu_base;
+
 #endif