mirror of
https://github.com/brain-hackers/u-boot-brain
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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>
37 lines
964 B
C
37 lines
964 B
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2002
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* Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
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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/i8254.h>
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#define TIMER1_VALUE 18 /* 15.6us */
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#define TIMER2_VALUE 0x0a8e /* 440Hz */
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int i8254_init(void)
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{
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/*
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* Initialize counter 1, used to refresh request signal.
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* This is required for legacy purpose as some codes like
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* vgabios utilizes counter 1 to provide delay functionality.
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*/
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outb(PIT_CMD_CTR1 | PIT_CMD_LOW | PIT_CMD_MODE2,
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PIT_BASE + PIT_COMMAND);
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outb(TIMER1_VALUE, PIT_BASE + PIT_T1);
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/*
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* Initialize counter 2, used to drive the speaker.
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* To start a beep, set both bit0 and bit1 of port 0x61.
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* To stop it, clear both bit0 and bit1 of port 0x61.
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*/
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outb(PIT_CMD_CTR2 | PIT_CMD_BOTH | PIT_CMD_MODE3,
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PIT_BASE + PIT_COMMAND);
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outb(TIMER2_VALUE & 0xff, PIT_BASE + PIT_T2);
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outb(TIMER2_VALUE >> 8, PIT_BASE + PIT_T2);
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return 0;
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}
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