u-boot/arch/arm/mach-imx/misc.c
Tom Rini 83d290c56f 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>
2018-05-07 09:34:12 -04:00

73 lines
1.5 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2013 Stefan Roese <sr@denx.de>
*/
#include <common.h>
#include <asm/arch/sys_proto.h>
#include <linux/errno.h>
#include <asm/io.h>
#include <asm/mach-imx/regs-common.h>
/* 1 second delay should be plenty of time for block reset. */
#define RESET_MAX_TIMEOUT 1000000
#define MXS_BLOCK_SFTRST (1 << 31)
#define MXS_BLOCK_CLKGATE (1 << 30)
int mxs_wait_mask_set(struct mxs_register_32 *reg, uint32_t mask, unsigned
int timeout)
{
while (--timeout) {
if ((readl(&reg->reg) & mask) == mask)
break;
udelay(1);
}
return !timeout;
}
int mxs_wait_mask_clr(struct mxs_register_32 *reg, uint32_t mask, unsigned
int timeout)
{
while (--timeout) {
if ((readl(&reg->reg) & mask) == 0)
break;
udelay(1);
}
return !timeout;
}
int mxs_reset_block(struct mxs_register_32 *reg)
{
/* Clear SFTRST */
writel(MXS_BLOCK_SFTRST, &reg->reg_clr);
if (mxs_wait_mask_clr(reg, MXS_BLOCK_SFTRST, RESET_MAX_TIMEOUT))
return 1;
/* Clear CLKGATE */
writel(MXS_BLOCK_CLKGATE, &reg->reg_clr);
/* Set SFTRST */
writel(MXS_BLOCK_SFTRST, &reg->reg_set);
/* Wait for CLKGATE being set */
if (mxs_wait_mask_set(reg, MXS_BLOCK_CLKGATE, RESET_MAX_TIMEOUT))
return 1;
/* Clear SFTRST */
writel(MXS_BLOCK_SFTRST, &reg->reg_clr);
if (mxs_wait_mask_clr(reg, MXS_BLOCK_SFTRST, RESET_MAX_TIMEOUT))
return 1;
/* Clear CLKGATE */
writel(MXS_BLOCK_CLKGATE, &reg->reg_clr);
if (mxs_wait_mask_clr(reg, MXS_BLOCK_CLKGATE, RESET_MAX_TIMEOUT))
return 1;
return 0;
}