aboutsummaryrefslogtreecommitdiff
path: root/arch
diff options
context:
space:
mode:
authorMichal Simek <michal.simek@xilinx.com>2014-01-31 12:55:06 +0100
committerKevin Hilman <khilman@linaro.org>2014-02-10 10:45:42 -0800
commit46f5b96085b03f9e71a0134de77efc6a1f9d84c3 (patch)
tree4b817342ee36f06bdbaffd616fb61698518d9c31 /arch
parent8760f7990a2dc202bb41278bc45c9c5c93e1da5c (diff)
downloadlinux-stericsson-46f5b96085b03f9e71a0134de77efc6a1f9d84c3.tar.gz
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: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Kevin Hilman <khilman@linaro.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mach-zynq/common.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm/mach-zynq/common.c b/arch/arm/mach-zynq/common.c
index 1db2a5ca9ab8..8c09a8393fb6 100644
--- a/arch/arm/mach-zynq/common.c
+++ b/arch/arm/mach-zynq/common.c
@@ -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