mirror of
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>
87 lines
1.6 KiB
C
87 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2007,2008 Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
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* Copyright (C) 2008 Renesas Solutions Corp.
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*
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* (C) Copyright 2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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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/processor.h>
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#define CMT_CMCSR_INIT 0x0001 /* PCLK/32 */
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#define CMT_CMCSR_CALIB 0x0000
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#define CMT_MAX_COUNTER (0xFFFFFFFF)
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#define CMT_TIMER_RESET (0xFFFF)
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static vu_long cmt0_timer;
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static void cmt_timer_start(unsigned int timer)
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{
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writew(readw(CMSTR) | 0x01, CMSTR);
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}
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static void cmt_timer_stop(unsigned int timer)
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{
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writew(readw(CMSTR) & ~0x01, CMSTR);
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}
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int timer_init(void)
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{
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cmt0_timer = 0;
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/* Divide clock by 32 */
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readw(CMCSR_0);
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writew(CMT_CMCSR_INIT, CMCSR_0);
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/* User Device 0 only */
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cmt_timer_stop(0);
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writew(CMT_TIMER_RESET, CMCOR_0);
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cmt_timer_start(0);
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return 0;
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}
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unsigned long long get_ticks(void)
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{
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return cmt0_timer;
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}
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static vu_long cmcnt = 0;
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static unsigned long get_usec (void)
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{
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ulong data = readw(CMCNT_0);
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if (data >= cmcnt)
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cmcnt = data - cmcnt;
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else
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cmcnt = (CMT_TIMER_RESET - cmcnt) + data;
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if ((cmt0_timer + cmcnt) > CMT_MAX_COUNTER)
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cmt0_timer = ((cmt0_timer + cmcnt) - CMT_MAX_COUNTER);
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else
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cmt0_timer += cmcnt;
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cmcnt = data;
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return cmt0_timer;
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}
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/* return msec */
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ulong get_timer(ulong base)
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{
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return (get_usec() / 1000) - base;
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}
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void __udelay(unsigned long usec)
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{
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unsigned long end = get_usec() + usec;
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while (get_usec() < end)
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continue;
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}
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unsigned long get_tbclk(void)
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{
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return CONFIG_SH_CMT_CLK_FREQ;
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}
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