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, 121 insertions, 0 deletions

diff --git a/arch/arm/plat-mxc/include/mach/iomux-v3.h b/arch/arm/plat-mxc/include/mach/iomux-v3.h
new file mode 100644
index 000000000000..7cd84547658f
--- /dev/null
+++ b/arch/arm/plat-mxc/include/mach/iomux-v3.h
@@ -0,0 +1,121 @@
+/*
+ * 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.
+ */
+
+#ifndef __MACH_IOMUX_V3_H__
+#define __MACH_IOMUX_V3_H__
+
+/*
+ *	build IOMUX_PAD structure
+ *
+ * This iomux scheme is based around pads, which are the physical balls
+ * on the processor.
+ *
+ * - Each pad has a pad control register (IOMUXC_SW_PAD_CTRL_x) which controls
+ *   things like driving strength and pullup/pulldown.
+ * - Each pad can have but not necessarily does have an output routing register
+ *   (IOMUXC_SW_MUX_CTL_PAD_x).
+ * - Each pad can have but not necessarily does have an input routing register
+ *   (IOMUXC_x_SELECT_INPUT)
+ *
+ * The three register sets do not have a fixed offset to each other,
+ * hence we order this table by pad control registers (which all pads
+ * have) and put the optional i/o routing registers into additional
+ * fields.
+ *
+ * The naming convention for the pad modes is MX35_PAD_<padname>__<padmode>
+ * If <padname> or <padmode> refers to a GPIO, it is named
+ * GPIO_<unit>_<num>
+ *
+ */
+
+struct pad_desc {
+	unsigned mux_ctrl_ofs:12; /* IOMUXC_SW_MUX_CTL_PAD offset */
+	unsigned mux_mode:8;
+	unsigned pad_ctrl_ofs:12; /* IOMUXC_SW_PAD_CTRL offset */
+#define	NO_PAD_CTRL	(1 << 16)
+	unsigned pad_ctrl:17;
+	unsigned select_input_ofs:12; /* IOMUXC_SELECT_INPUT offset */
+	unsigned select_input:3;
+};
+
+#define IOMUX_PAD(_pad_ctrl_ofs, _mux_ctrl_ofs, _mux_mode, _select_input_ofs, \
+		_select_input, _pad_ctrl)				\
+		{							\
+			.mux_ctrl_ofs     = _mux_ctrl_ofs,		\
+			.mux_mode         = _mux_mode,			\
+			.pad_ctrl_ofs     = _pad_ctrl_ofs,		\
+			.pad_ctrl         = _pad_ctrl,			\
+			.select_input_ofs = _select_input_ofs,		\
+			.select_input     = _select_input,		\
+		}
+
+/*
+ * Use to set PAD control
+ */
+#define PAD_CTL_DRIVE_VOLTAGE_3_3_V	0
+#define PAD_CTL_DRIVE_VOLTAGE_1_8_V	1
+
+#define PAD_CTL_NO_HYSTERESIS		0
+#define PAD_CTL_HYSTERESIS		1
+
+#define PAD_CTL_PULL_DISABLED		0x0
+#define PAD_CTL_PULL_KEEPER		0xa
+#define PAD_CTL_PULL_DOWN_100K		0xc
+#define PAD_CTL_PULL_UP_47K		0xd
+#define PAD_CTL_PULL_UP_100K		0xe
+#define PAD_CTL_PULL_UP_22K		0xf
+
+#define PAD_CTL_OUTPUT_CMOS		0
+#define PAD_CTL_OUTPUT_OPEN_DRAIN	1
+
+#define PAD_CTL_DRIVE_STRENGTH_NORM	0
+#define PAD_CTL_DRIVE_STRENGTH_HIGH	1
+#define PAD_CTL_DRIVE_STRENGTH_MAX	2
+
+#define PAD_CTL_SLEW_RATE_SLOW		0
+#define PAD_CTL_SLEW_RATE_FAST		1
+
+/*
+ * setups a single pad:
+ * 	- reserves the pad 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);
+
+/*
+ * setups mutliple pads
+ * convenient way to call the above function with tables
+ */
+int mxc_iomux_v3_setup_multiple_pads(struct pad_desc *pad_list, unsigned count);
+
+/*
+ * releases a single pad:
+ * 	- make it available for a future use by another driver
+ * 	- DOES NOT reconfigure the IOMUX in its reset state
+ */
+void mxc_iomux_v3_release_pad(struct pad_desc *pad);
+
+/*
+ * releases multiple pads
+ * convenvient way to call the above function with tables
+ */
+void mxc_iomux_v3_release_multiple_pads(struct pad_desc *pad_list, int count);
+
+#endif /* __MACH_IOMUX_V3_H__*/
+