u-boot/include/linux/delay.h

/* SPDX-License-Identifier: GPL-2.0+ */

#ifndef _LINUX_DELAY_H
#define _LINUX_DELAY_H

#include <linux/kernel.h>

void __udelay(unsigned long usec);
void udelay(unsigned long usec);

static inline void mdelay(unsigned long msec)
{
	udelay(1000 * msec);
}

static inline void ndelay(unsigned long nsec)
{
	udelay(DIV_ROUND_UP(nsec, 1000));
}

#endif /* defined(_LINUX_DELAY_H) */
SPDX: Convert all of our single license tags to Linux Kernel style 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> 2018-05-06 17:58:06 -04:00			`/* SPDX-License-Identifier: GPL-2.0+ */`
delay: collect {m, n, u}delay declarations to include/linux/delay.h Currently, mdelay() and udelay() are declared in include/common.h, while ndelay() in include/linux/compat.h. It would be nice to collect them into include/linux/delay.h like Linux. While we are here, fix the ndelay() implementation; I used the DIV_ROUND_UP() instead of (x)/1000 because it must wait longer than the given period of time. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Simon Glass <sjg@chromium.org> 2016-12-28 00:35:59 +09:00
			`#ifndef _LINUX_DELAY_H`
			`#define _LINUX_DELAY_H`

			`#include <linux/kernel.h>`

			`void __udelay(unsigned long usec);`
			`void udelay(unsigned long usec);`

			`static inline void mdelay(unsigned long msec)`
			`{`
time: Update mdelay() to delay in one large chunk The current function delays in one millisecond at a time. This does not work well on sandbox since it results in lots of calls to usleep(1000) in a tight loop. This makes the sleep duration quite variable since each call results in a sleep of at least 1000us, but possibly more. Depending on how busy the machine is, the sleep time can change quite a bit. We cannot fix this in general, but we can reduce the effect by doing a single sleep. The multiplication works fine with an unsigned long argument up until a sleep time of about 4m milliseconds. This is over an hour and we can be sure that delays of that length are not useful. Update the mdelay() function to call udelay() only once with the calculated delay value. Signed-off-by: Simon Glass <sjg@chromium.org> 2018-11-23 21:29:40 -07:00			`udelay(1000 * msec);`
delay: collect {m, n, u}delay declarations to include/linux/delay.h Currently, mdelay() and udelay() are declared in include/common.h, while ndelay() in include/linux/compat.h. It would be nice to collect them into include/linux/delay.h like Linux. While we are here, fix the ndelay() implementation; I used the DIV_ROUND_UP() instead of (x)/1000 because it must wait longer than the given period of time. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Simon Glass <sjg@chromium.org> 2016-12-28 00:35:59 +09:00			`}`

			`static inline void ndelay(unsigned long nsec)`
			`{`
			`udelay(DIV_ROUND_UP(nsec, 1000));`
			`}`

			`#endif /* defined(_LINUX_DELAY_H) */`