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ARM: zynq: Reserve not DMAable space in front of the kernel

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Reserve space from 0x0 - __pa(swapper_pg_dir),
if kernel is loaded from 0, which is not DMAable.
It is causing problem with MMC driver and others
which want to add dma buffers to this space.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Kevin Hilman <khilman@linaro.org>
This commit is contained in:
Michal Simek 2014-01-31 12:55:06 +01:00 committed by Kevin Hilman
parent 8760f7990a
commit 46f5b96085
1 changed files with 14 additions and 0 deletions
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14
arch/arm/mach-zynq/common.c
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@ -25,6 +25,7 @@
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/of.h>
#include <linux/memblock.h>
#include <linux/irqchip.h>
#include <linux/irqchip/arm-gic.h>
@ -41,6 +42,18 @@
void __iomem *zynq_scu_base;
/**
* zynq_memory_init - Initialize special memory
*
* We need to stop things allocating the low memory as DMA can't work in
* the 1st 512K of memory.
*/
static void __init zynq_memory_init(void)
{
if (!__pa(PAGE_OFFSET))
memblock_reserve(__pa(PAGE_OFFSET), __pa(swapper_pg_dir));
}
static struct platform_device zynq_cpuidle_device = {
.name = "cpuidle-zynq",
};
@ -117,5 +130,6 @@ DT_MACHINE_START(XILINX_EP107, "Xilinx Zynq Platform")
.init_machine = zynq_init_machine,
.init_time = zynq_timer_init,
.dt_compat = zynq_dt_match,
.reserve = zynq_memory_init,
.restart = zynq_system_reset,
MACHINE_END