MXC: Add iomux support for MX35 SoCs

This iomux is called iomux-v3 in the tree because it is the third known
incarnation of MXC iomuxers. It is not only found on the MX35 but also
on the MX51 and probably others.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 98 insertions, 0 deletions

diff --git a/arch/arm/plat-mxc/iomux-v3.c b/arch/arm/plat-mxc/iomux-v3.c
new file mode 100644
index 000000000000..77a078f9513f
--- /dev/null
+++ b/arch/arm/plat-mxc/iomux-v3.c
@@ -0,0 +1,98 @@
+/*
+ * Copyright 2004-2006 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.de>
+ * Copyright (C) 2009 by Jan Weitzel Phytec Messtechnik GmbH,
+ *                       <armlinux@phytec.de>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/gpio.h>
+
+#include <mach/hardware.h>
+#include <asm/mach/map.h>
+#include <mach/iomux-v3.h>
+
+#define IOMUX_BASE	IO_ADDRESS(IOMUXC_BASE_ADDR)
+
+static unsigned long iomux_v3_pad_alloc_map[0x200 / BITS_PER_LONG];
+
+/*
+ * setups a single pin:
+ * 	- reserves the pin so that it is not claimed by another driver
+ * 	- setups the iomux according to the configuration
+ */
+int mxc_iomux_v3_setup_pad(struct pad_desc *pad)
+{
+	unsigned int pad_ofs = pad->pad_ctrl_ofs;
+
+	if (test_and_set_bit(pad_ofs >> 2, iomux_v3_pad_alloc_map))
+		return -EBUSY;
+	if (pad->mux_ctrl_ofs)
+		__raw_writel(pad->mux_mode, IOMUX_BASE + pad->mux_ctrl_ofs);
+
+	if (pad->select_input_ofs)
+		__raw_writel(pad->select_input,
+				IOMUX_BASE + pad->select_input_ofs);
+
+	if (!(pad->pad_ctrl & NO_PAD_CTRL))
+		__raw_writel(pad->pad_ctrl, IOMUX_BASE + pad->pad_ctrl_ofs);
+	return 0;
+}
+EXPORT_SYMBOL(mxc_iomux_v3_setup_pad);
+
+int mxc_iomux_v3_setup_multiple_pads(struct pad_desc *pad_list, unsigned count)
+{
+	struct pad_desc *p = pad_list;
+	int i;
+	int ret;
+
+	for (i = 0; i < count; i++) {
+		ret = mxc_iomux_v3_setup_pad(p);
+		if (ret)
+			goto setup_error;
+		p++;
+	}
+	return 0;
+
+setup_error:
+	mxc_iomux_v3_release_multiple_pads(pad_list, i);
+	return ret;
+}
+EXPORT_SYMBOL(mxc_iomux_v3_setup_multiple_pads);
+
+void mxc_iomux_v3_release_pad(struct pad_desc *pad)
+{
+	unsigned int pad_ofs = pad->pad_ctrl_ofs;
+
+	clear_bit(pad_ofs >> 2, iomux_v3_pad_alloc_map);
+}
+EXPORT_SYMBOL(mxc_iomux_v3_release_pad);
+
+void mxc_iomux_v3_release_multiple_pads(struct pad_desc *pad_list, int count)
+{
+	struct pad_desc *p = pad_list;
+	int i;
+
+	for (i = 0; i < count; i++) {
+		mxc_iomux_v3_release_pad(p);
+		p++;
+	}
+}
+EXPORT_SYMBOL(mxc_iomux_v3_release_multiple_pads);