119 lines
2.8 KiB
C
119 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 1999 ARM Limited
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* Copyright (C) 2000 Deep Blue Solutions Ltd
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* Copyright 2006-2007 Freescale Semiconductor, Inc. All Rights Reserved.
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* Copyright 2008 Juergen Beisert, kernel@pengutronix.de
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* Copyright 2009 Ilya Yanok, Emcraft Systems Ltd, yanok@emcraft.com
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*/
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#include <linux/kernel.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/delay.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <asm/system_misc.h>
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#include <asm/proc-fns.h>
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#include <asm/mach-types.h>
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#include <asm/hardware/cache-l2x0.h>
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#include "common.h"
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#include "hardware.h"
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static void __iomem *wdog_base;
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static struct clk *wdog_clk;
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static int wcr_enable = (1 << 2);
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/*
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* Reset the system. It is called by machine_restart().
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*/
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void mxc_restart(enum reboot_mode mode, const char *cmd)
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{
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if (!wdog_base)
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goto reset_fallback;
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if (!IS_ERR(wdog_clk))
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clk_enable(wdog_clk);
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/* Assert SRS signal */
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imx_writew(wcr_enable, wdog_base);
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/*
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* Due to imx6q errata ERR004346 (WDOG: WDOG SRS bit requires to be
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* written twice), we add another two writes to ensure there must be at
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* least two writes happen in the same one 32kHz clock period. We save
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* the target check here, since the writes shouldn't be a huge burden
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* for other platforms.
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*/
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imx_writew(wcr_enable, wdog_base);
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imx_writew(wcr_enable, wdog_base);
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/* wait for reset to assert... */
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mdelay(500);
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pr_err("%s: Watchdog reset failed to assert reset\n", __func__);
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/* delay to allow the serial port to show the message */
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mdelay(50);
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reset_fallback:
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/* we'll take a jump through zero as a poor second */
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soft_restart(0);
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}
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void __init mxc_arch_reset_init(void __iomem *base)
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{
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wdog_base = base;
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wdog_clk = clk_get_sys("imx2-wdt.0", NULL);
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if (IS_ERR(wdog_clk))
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pr_warn("%s: failed to get wdog clock\n", __func__);
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else
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clk_prepare(wdog_clk);
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}
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#ifdef CONFIG_SOC_IMX1
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void __init imx1_reset_init(void __iomem *base)
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{
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wcr_enable = (1 << 0);
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mxc_arch_reset_init(base);
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}
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#endif
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#ifdef CONFIG_CACHE_L2X0
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void __init imx_init_l2cache(void)
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{
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void __iomem *l2x0_base;
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struct device_node *np;
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unsigned int val;
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np = of_find_compatible_node(NULL, NULL, "arm,pl310-cache");
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if (!np)
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return;
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l2x0_base = of_iomap(np, 0);
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if (!l2x0_base)
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goto put_node;
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if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) {
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/* Configure the L2 PREFETCH and POWER registers */
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val = readl_relaxed(l2x0_base + L310_PREFETCH_CTRL);
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val |= L310_PREFETCH_CTRL_DBL_LINEFILL |
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L310_PREFETCH_CTRL_INSTR_PREFETCH |
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L310_PREFETCH_CTRL_DATA_PREFETCH;
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/* Set perfetch offset to improve performance */
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val &= ~L310_PREFETCH_CTRL_OFFSET_MASK;
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val |= 15;
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writel_relaxed(val, l2x0_base + L310_PREFETCH_CTRL);
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}
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iounmap(l2x0_base);
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put_node:
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of_node_put(np);
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}
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#endif
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