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https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
38 lines
955 B
C
38 lines
955 B
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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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#include <common.h>
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#include <asm/barriers.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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dsb();
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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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