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| author | Michal Simek <michal.simek@xilinx.com> | 2013-03-20 11:11:43 +0100 |
|---|---|---|
| committer | Michal Simek <michal.simek@xilinx.com> | 2013-04-04 09:22:28 +0200 |
| commit | 732078c369f0b6ad9fe75c1faff721e91260bc5d (patch) | |
| tree | f89298d77dd4369df13d67c84da097b750bf82c1 | |
| parent | arm: zynq: Move timer to generic location (diff) | |
| download | linux-732078c369f0b6ad9fe75c1faff721e91260bc5d.tar.xz linux-732078c369f0b6ad9fe75c1faff721e91260bc5d.zip | |
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>
| -rw-r--r-- | arch/arm/mach-zynq/common.c | 34 | ||||
| -rw-r--r-- | arch/arm/mach-zynq/common.h | 2 |
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 |