cregit-Linux how code gets into the kernel

Release 4.16 lib/stmp_device.c

Directory: lib
/*
 * Copyright (C) 1999 ARM Limited
 * Copyright (C) 2000 Deep Blue Solutions Ltd
 * Copyright 2006-2007,2010 Freescale Semiconductor, Inc. All Rights Reserved.
 * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
 * Copyright 2009 Ilya Yanok, Emcraft Systems Ltd, yanok@emcraft.com
 * Copyright (C) 2011 Wolfram Sang, Pengutronix e.K.
 *
 * 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 <linux/io.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/compiler.h>
#include <linux/export.h>
#include <linux/stmp_device.h>


#define STMP_MODULE_CLKGATE	(1 << 30)

#define STMP_MODULE_SFTRST	(1 << 31)

/*
 * Clear the bit and poll it cleared.  This is usually called with
 * a reset address and mask being either SFTRST(bit 31) or CLKGATE
 * (bit 30).
 */

static int stmp_clear_poll_bit(void __iomem *addr, u32 mask) { int timeout = 0x400; writel(mask, addr + STMP_OFFSET_REG_CLR); udelay(1); while ((readl(addr) & mask) && --timeout) /* nothing */; return !timeout; }

Contributors

PersonTokensPropCommitsCommitProp
Wolfram Sang53100.00%1100.00%
Total53100.00%1100.00%


int stmp_reset_block(void __iomem *reset_addr) { int ret; int timeout = 0x400; /* clear and poll SFTRST */ ret = stmp_clear_poll_bit(reset_addr, STMP_MODULE_SFTRST); if (unlikely(ret)) goto error; /* clear CLKGATE */ writel(STMP_MODULE_CLKGATE, reset_addr + STMP_OFFSET_REG_CLR); /* set SFTRST to reset the block */ writel(STMP_MODULE_SFTRST, reset_addr + STMP_OFFSET_REG_SET); udelay(1); /* poll CLKGATE becoming set */ while ((!(readl(reset_addr) & STMP_MODULE_CLKGATE)) && --timeout) /* nothing */; if (unlikely(!timeout)) goto error; /* clear and poll SFTRST */ ret = stmp_clear_poll_bit(reset_addr, STMP_MODULE_SFTRST); if (unlikely(ret)) goto error; /* clear and poll CLKGATE */ ret = stmp_clear_poll_bit(reset_addr, STMP_MODULE_CLKGATE); if (unlikely(ret)) goto error; return 0; error: pr_err("%s(%p): module reset timeout\n", __func__, reset_addr); return -ETIMEDOUT; }

Contributors

PersonTokensPropCommitsCommitProp
Wolfram Sang152100.00%1100.00%
Total152100.00%1100.00%

EXPORT_SYMBOL(stmp_reset_block);

Overall Contributors

PersonTokensPropCommitsCommitProp
Wolfram Sang23498.32%150.00%
Rasmus Villemoes41.68%150.00%
Total238100.00%2100.00%
Directory: lib
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