[PATCH 04/10] arm: zynq: Load scu baseaddress at run time
Rob Herring
robherring2 at gmail.com
Mon Mar 25 10:06:12 EDT 2013
On 03/25/2013 08:53 AM, Michal Simek wrote:
> Use Cortex a9 cp15 to read scu baseaddress.
>
> Signed-off-by: Michal Simek <michal.simek at xilinx.com>
> ---
> arch/arm/boot/dts/zynq-7000.dtsi | 5 +++++
> arch/arm/mach-zynq/common.c | 33 +++++++++++++++++++++------------
> arch/arm/mach-zynq/common.h | 2 ++
> 3 files changed, 28 insertions(+), 12 deletions(-)
>
> diff --git a/arch/arm/boot/dts/zynq-7000.dtsi b/arch/arm/boot/dts/zynq-7000.dtsi
> index 2a72339..4943568 100644
> --- a/arch/arm/boot/dts/zynq-7000.dtsi
> +++ b/arch/arm/boot/dts/zynq-7000.dtsi
> @@ -22,6 +22,11 @@
> interrupt-parent = <&intc>;
> ranges;
>
> + scu: scu at f8f000000 {
> + compatible = "arm,cortex-a9-scu";
> + reg = <0xf8f00000 0x58>;
> + };
> +
It's fine to add this, but you don't really need it for this patch.
> intc: interrupt-controller at f8f01000 {
> compatible = "arm,cortex-a9-gic";
> #interrupt-cells = <3>;
> diff --git a/arch/arm/mach-zynq/common.c b/arch/arm/mach-zynq/common.c
> index 68e0907..13f9d8b 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 *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 +73,30 @@ 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 scu_init(void)
> +{
> + unsigned long base;
> +
> + base = scu_a9_get_base();
> + zynq_cortex_a9_scu_map.pfn = __phys_to_pfn(base);
> + zynq_cortex_a9_scu_map.virtual = base;
You are setting the virtual address to the physical base?
> + iotable_init(&zynq_cortex_a9_scu_map, 1);
Then creating a static mapping...
> + scu_base = ioremap(base, zynq_cortex_a9_scu_map.length);
And also a dynamic mapping?
Rob
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