From 8870e4599689a879051f945c97551309d23ff176 Mon Sep 17 00:00:00 2001
From: Stefan Roese <sr@denx.de>
Date: Tue, 9 Apr 2013 21:06:08 +0000
Subject: imx: Move some i.MX common functions into the imx-common directory

This patch moves the following functions into the imx-common
directory:

- mxs_wait_mask_set()
- mxs_wait_mask_clr()
- mxs_reset_block()

These are currently used by i.MX28. But the upcoming GPMI NAND port
for i.MX6 will also use these functions. So lets move them to a
common location to re-use them.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
---
 arch/arm/imx-common/misc.c | 84 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 arch/arm/imx-common/misc.c

(limited to 'arch/arm/imx-common/misc.c')

diff --git a/arch/arm/imx-common/misc.c b/arch/arm/imx-common/misc.c
new file mode 100644
index 0000000..220785c
--- /dev/null
+++ b/arch/arm/imx-common/misc.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright 2013 Stefan Roese <sr@denx.de>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 <common.h>
+#include <asm/errno.h>
+#include <asm/io.h>
+#include <asm/imx-common/regs-common.h>
+
+/* 1 second delay should be plenty of time for block reset. */
+#define	RESET_MAX_TIMEOUT	1000000
+
+#define	MXS_BLOCK_SFTRST	(1 << 31)
+#define	MXS_BLOCK_CLKGATE	(1 << 30)
+
+int mxs_wait_mask_set(struct mxs_register_32 *reg, uint32_t mask, unsigned
+								int timeout)
+{
+	while (--timeout) {
+		if ((readl(&reg->reg) & mask) == mask)
+			break;
+		udelay(1);
+	}
+
+	return !timeout;
+}
+
+int mxs_wait_mask_clr(struct mxs_register_32 *reg, uint32_t mask, unsigned
+								int timeout)
+{
+	while (--timeout) {
+		if ((readl(&reg->reg) & mask) == 0)
+			break;
+		udelay(1);
+	}
+
+	return !timeout;
+}
+
+int mxs_reset_block(struct mxs_register_32 *reg)
+{
+	/* Clear SFTRST */
+	writel(MXS_BLOCK_SFTRST, &reg->reg_clr);
+
+	if (mxs_wait_mask_clr(reg, MXS_BLOCK_SFTRST, RESET_MAX_TIMEOUT))
+		return 1;
+
+	/* Clear CLKGATE */
+	writel(MXS_BLOCK_CLKGATE, &reg->reg_clr);
+
+	/* Set SFTRST */
+	writel(MXS_BLOCK_SFTRST, &reg->reg_set);
+
+	/* Wait for CLKGATE being set */
+	if (mxs_wait_mask_set(reg, MXS_BLOCK_CLKGATE, RESET_MAX_TIMEOUT))
+		return 1;
+
+	/* Clear SFTRST */
+	writel(MXS_BLOCK_SFTRST, &reg->reg_clr);
+
+	if (mxs_wait_mask_clr(reg, MXS_BLOCK_SFTRST, RESET_MAX_TIMEOUT))
+		return 1;
+
+	/* Clear CLKGATE */
+	writel(MXS_BLOCK_CLKGATE, &reg->reg_clr);
+
+	if (mxs_wait_mask_clr(reg, MXS_BLOCK_CLKGATE, RESET_MAX_TIMEOUT))
+		return 1;
+
+	return 0;
+}
-- 
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