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Commit 46f5b960 authored by Michal Simek's avatar Michal Simek Committed by Kevin Hilman
Browse files

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



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: default avatarMichal Simek <michal.simek@xilinx.com>
Signed-off-by: default avatarKevin Hilman <khilman@linaro.org>
parent 8760f799

arch/arm/mach-zynq/common.c

+14 −0
Original line number Diff line number Diff line
@@ -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