Initial import

1 files changed, 131 insertions, 0 deletions

diff --git a/arch/arm/mach-imx/system.c b/arch/arm/mach-imx/system.c
new file mode 100644
index 000000000..51c35013b
--- /dev/null
+++ b/arch/arm/mach-imx/system.c
@@ -0,0 +1,131 @@
+/*
+ * 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;
+
+/*
+ * Reset the system. It is called by machine_restart().
+ */
+void mxc_restart(enum reboot_mode mode, const char *cmd)
+{
+	unsigned int wcr_enable;
+
+	if (!wdog_base)
+		goto reset_fallback;
+
+	if (!IS_ERR(wdog_clk))
+		clk_enable(wdog_clk);
+
+	if (cpu_is_mx1())
+		wcr_enable = (1 << 0);
+	else
+		wcr_enable = (1 << 2);
+
+	/* Assert SRS signal */
+	__raw_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.
+	 */
+	__raw_writew(wcr_enable, wdog_base);
+	__raw_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_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)
+		goto out;
+
+	l2x0_base = of_iomap(np, 0);
+	if (!l2x0_base) {
+		of_node_put(np);
+		goto out;
+	}
+
+	/* Configure the L2 PREFETCH and POWER registers */
+	val = readl_relaxed(l2x0_base + L310_PREFETCH_CTRL);
+	val |= 0x70800000;
+	/*
+	 * The L2 cache controller(PL310) version on the i.MX6D/Q is r3p1-50rel0
+	 * The L2 cache controller(PL310) version on the i.MX6DL/SOLO/SL is r3p2
+	 * But according to ARM PL310 errata: 752271
+	 * ID: 752271: Double linefill feature can cause data corruption
+	 * Fault Status: Present in: r3p0, r3p1, r3p1-50rel0. Fixed in r3p2
+	 * Workaround: The only workaround to this erratum is to disable the
+	 * double linefill feature. This is the default behavior.
+	 */
+	if (cpu_is_imx6q())
+		val &= ~(1 << 30 | 1 << 23);
+	writel_relaxed(val, l2x0_base + L310_PREFETCH_CTRL);
+
+	iounmap(l2x0_base);
+	of_node_put(np);
+
+out:
+	l2x0_of_init(0, ~0);
+}
+#endif