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https://github.com/brain-hackers/u-boot-brain
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0ea5a04fbc
Some parts of the sunxi code cast explicitly between u32 values and pointers. This is not a problem in practice, because all 64bit SoCs today only use the lower 32 bits for their phyical address space. But we need to make sure that the compiler is sure this is not an accident as well. Signed-off-by: Alexander Graf <agraf@suse.de> Acked-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
38 lines
924 B
C
38 lines
924 B
C
/*
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* DRAM init helper functions
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*
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* (C) Copyright 2015 Hans de Goede <hdegoede@redhat.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/dram.h>
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/*
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* Wait up to 1s for value to be set in given part of reg.
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*/
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void mctl_await_completion(u32 *reg, u32 mask, u32 val)
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{
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unsigned long tmo = timer_get_us() + 1000000;
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while ((readl(reg) & mask) != val) {
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if (timer_get_us() > tmo)
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panic("Timeout initialising DRAM\n");
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}
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}
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/*
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* Test if memory at offset offset matches memory at begin of DRAM
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*/
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bool mctl_mem_matches(u32 offset)
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{
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/* Try to write different values to RAM at two addresses */
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writel(0, CONFIG_SYS_SDRAM_BASE);
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writel(0xaa55aa55, (ulong)CONFIG_SYS_SDRAM_BASE + offset);
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/* Check if the same value is actually observed when reading back */
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return readl(CONFIG_SYS_SDRAM_BASE) ==
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readl((ulong)CONFIG_SYS_SDRAM_BASE + offset);
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}
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