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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>
This commit is contained in:
Michal Simek 2013-03-20 11:11:43 +01:00
parent 4f0f234fce
commit 732078c369
2 changed files with 24 additions and 12 deletions
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34
arch/arm/mach-zynq/common.c
View File

@ -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[] = {

2
arch/arm/mach-zynq/common.h
View File

@ -17,4 +17,6 @@
#ifndef __MACH_ZYNQ_COMMON_H__
#define __MACH_ZYNQ_COMMON_H__
extern void __iomem *zynq_scu_base;
#endif