mirror of
https://github.com/torvalds/linux.git
synced 2024-11-20 02:51:44 +00:00
6f98cb22e4
There is only one call site for this, and it's easily replaced by initializing the reset value at boot time. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
128 lines
3.3 KiB
C
128 lines
3.3 KiB
C
/*
|
|
* Copyright (C) 1999 ARM Limited
|
|
* Copyright (C) 2000 Deep Blue Solutions Ltd
|
|
* Copyright 2006-2007 Freescale Semiconductor, Inc. All Rights Reserved.
|
|
* Copyright 2008 Juergen Beisert, kernel@pengutronix.de
|
|
* Copyright 2009 Ilya Yanok, Emcraft Systems Ltd, yanok@emcraft.com
|
|
*
|
|
* 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.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/io.h>
|
|
#include <linux/err.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
|
|
#include <asm/system_misc.h>
|
|
#include <asm/proc-fns.h>
|
|
#include <asm/mach-types.h>
|
|
#include <asm/hardware/cache-l2x0.h>
|
|
|
|
#include "common.h"
|
|
#include "hardware.h"
|
|
|
|
static void __iomem *wdog_base;
|
|
static struct clk *wdog_clk;
|
|
static int wcr_enable = (1 << 2);
|
|
|
|
/*
|
|
* Reset the system. It is called by machine_restart().
|
|
*/
|
|
void mxc_restart(enum reboot_mode mode, const char *cmd)
|
|
{
|
|
if (!wdog_base)
|
|
goto reset_fallback;
|
|
|
|
if (!IS_ERR(wdog_clk))
|
|
clk_enable(wdog_clk);
|
|
|
|
/* Assert SRS signal */
|
|
imx_writew(wcr_enable, wdog_base);
|
|
/*
|
|
* Due to imx6q errata ERR004346 (WDOG: WDOG SRS bit requires to be
|
|
* written twice), we add another two writes to ensure there must be at
|
|
* least two writes happen in the same one 32kHz clock period. We save
|
|
* the target check here, since the writes shouldn't be a huge burden
|
|
* for other platforms.
|
|
*/
|
|
imx_writew(wcr_enable, wdog_base);
|
|
imx_writew(wcr_enable, wdog_base);
|
|
|
|
/* wait for reset to assert... */
|
|
mdelay(500);
|
|
|
|
pr_err("%s: Watchdog reset failed to assert reset\n", __func__);
|
|
|
|
/* delay to allow the serial port to show the message */
|
|
mdelay(50);
|
|
|
|
reset_fallback:
|
|
/* we'll take a jump through zero as a poor second */
|
|
soft_restart(0);
|
|
}
|
|
|
|
void __init mxc_arch_reset_init(void __iomem *base)
|
|
{
|
|
wdog_base = base;
|
|
|
|
wdog_clk = clk_get_sys("imx2-wdt.0", NULL);
|
|
if (IS_ERR(wdog_clk))
|
|
pr_warn("%s: failed to get wdog clock\n", __func__);
|
|
else
|
|
clk_prepare(wdog_clk);
|
|
}
|
|
|
|
#ifdef CONFIG_SOC_IMX1
|
|
void __init imx1_reset_init(void __iomem *base)
|
|
{
|
|
wcr_enable = (1 << 0);
|
|
mxc_arch_reset_init(base);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_CACHE_L2X0
|
|
void __init imx_init_l2cache(void)
|
|
{
|
|
void __iomem *l2x0_base;
|
|
struct device_node *np;
|
|
unsigned int val;
|
|
|
|
np = of_find_compatible_node(NULL, NULL, "arm,pl310-cache");
|
|
if (!np)
|
|
return;
|
|
|
|
l2x0_base = of_iomap(np, 0);
|
|
if (!l2x0_base)
|
|
goto put_node;
|
|
|
|
if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) {
|
|
/* Configure the L2 PREFETCH and POWER registers */
|
|
val = readl_relaxed(l2x0_base + L310_PREFETCH_CTRL);
|
|
val |= L310_PREFETCH_CTRL_DBL_LINEFILL |
|
|
L310_PREFETCH_CTRL_INSTR_PREFETCH |
|
|
L310_PREFETCH_CTRL_DATA_PREFETCH;
|
|
|
|
/* Set perfetch offset to improve performance */
|
|
val &= ~L310_PREFETCH_CTRL_OFFSET_MASK;
|
|
val |= 15;
|
|
|
|
writel_relaxed(val, l2x0_base + L310_PREFETCH_CTRL);
|
|
}
|
|
|
|
iounmap(l2x0_base);
|
|
put_node:
|
|
of_node_put(np);
|
|
}
|
|
#endif
|