From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Thu, 11 Apr 2024 10:27:49 +0200
Subject: Adding upstream version 6.6.15.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 arch/arm/mach-imx/system.c | 118 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 arch/arm/mach-imx/system.c

(limited to 'arch/arm/mach-imx/system.c')

diff --git a/arch/arm/mach-imx/system.c b/arch/arm/mach-imx/system.c
new file mode 100644
index 0000000000..e88ca02712
--- /dev/null
+++ b/arch/arm/mach-imx/system.c
@@ -0,0 +1,118 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * 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
+ */
+
+#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
-- 
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