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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778// SPDX-License-Identifier: GPL-2.0-or-later/* * 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. */
#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;}
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;}EXPORT_SYMBOL(stmp_reset_block);