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/*
* Freescale i.MXS common code
*
* Copyright (C) 2012 Wolfram Sang <w.sang@pengutronix.de>
*
* Based on code from LTIB:
* Copyright (C) 2010 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*/
#include <common.h>
#include <io.h>
#include <stmp-device.h>
#include <errno.h>
#include <clock.h>
#define STMP_IP_RESET_TIMEOUT (10 * MSECOND)
#define STMP_BLOCK_SFTRST (1 << 31)
#define STMP_BLOCK_CLKGATE (1 << 30)
int stmp_reset_block(void __iomem *reg, int just_enable)
{
/* Clear SFTRST */
writel(STMP_BLOCK_SFTRST, reg + STMP_OFFSET_REG_CLR);
if (wait_on_timeout(STMP_IP_RESET_TIMEOUT, !(readl(reg) & STMP_BLOCK_SFTRST)))
goto timeout;
/* Clear CLKGATE */
writel(STMP_BLOCK_CLKGATE, reg + STMP_OFFSET_REG_CLR);
if (!just_enable) {
/* Set SFTRST */
writel(STMP_BLOCK_SFTRST, reg + STMP_OFFSET_REG_SET);
/* Wait for CLKGATE being set */
if (wait_on_timeout(STMP_IP_RESET_TIMEOUT, readl(reg) & STMP_BLOCK_CLKGATE))
goto timeout;
}
/* Clear SFTRST */
writel(STMP_BLOCK_SFTRST, reg + STMP_OFFSET_REG_CLR);
if (wait_on_timeout(STMP_IP_RESET_TIMEOUT, !(readl(reg) & STMP_BLOCK_SFTRST)))
goto timeout;
/* Clear CLKGATE */
writel(STMP_BLOCK_CLKGATE, reg + STMP_OFFSET_REG_CLR);
if (wait_on_timeout(STMP_IP_RESET_TIMEOUT, !(readl(reg) & STMP_BLOCK_CLKGATE)))
goto timeout;
return 0;
timeout:
printf("MXS: Timeout resetting block via register 0x%p\n", reg);
return -ETIMEDOUT;
}
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