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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>
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@ -25,6 +25,7 @@
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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#include <linux/of.h>
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#include <linux/memblock.h>
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#include <linux/irqchip.h>
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#include <linux/irqchip/arm-gic.h>
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@ -41,6 +42,18 @@
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void __iomem *zynq_scu_base;
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/**
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* zynq_memory_init - Initialize special memory
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*
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* We need to stop things allocating the low memory as DMA can't work in
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* the 1st 512K of memory.
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*/
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static void __init zynq_memory_init(void)
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{
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if (!__pa(PAGE_OFFSET))
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memblock_reserve(__pa(PAGE_OFFSET), __pa(swapper_pg_dir));
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}
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static struct platform_device zynq_cpuidle_device = {
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.name = "cpuidle-zynq",
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};
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@ -117,5 +130,6 @@ DT_MACHINE_START(XILINX_EP107, "Xilinx Zynq Platform")
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.init_machine = zynq_init_machine,
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.init_time = zynq_timer_init,
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.dt_compat = zynq_dt_match,
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.reserve = zynq_memory_init,
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.restart = zynq_system_reset,
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MACHINE_END
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