imx: mx7ulp: add iomux driver to support IOMUXC0 and IOMUXC1

Add a new driver under ULP directory to support its IOMUXC
controllers. The ULP has two IOMUXC, the IOMUXC0 is used
for M4 domain, while IOMUXC1 is for A7. We set IOMUXC1 as
the default IOMUX in this driver. Any pins in IOMUXC0 needs
to configure with IOMUX_CONFIG_MPORTS in its mux_mode field.

Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by : Stefano Babic <sbabic@denx.de>

3 files changed, 173 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv7/mx7ulp/Makefile b/arch/arm/cpu/armv7/mx7ulp/Makefile
new file mode 100644
index 0000000..be038e7
--- /dev/null
+++ b/arch/arm/cpu/armv7/mx7ulp/Makefile
@@ -0,0 +1,8 @@
+#
+# (C) Copyright 2016 Freescale Semiconductor, Inc.
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+#
+
+obj-y	:= iomux.o
diff --git a/arch/arm/cpu/armv7/mx7ulp/iomux.c b/arch/arm/cpu/armv7/mx7ulp/iomux.c
new file mode 100644
index 0000000..1eba24e
--- /dev/null
+++ b/arch/arm/cpu/armv7/mx7ulp/iomux.c
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2016 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/imx-regs.h>
+#include <asm/arch/iomux.h>
+
+static void *base = (void *)IOMUXC_BASE_ADDR;
+
+/*
+ * iomuxc0 base address. In imx7ulp-pins.h,
+ * the offsets of pins in iomuxc0 are from 0xD000,
+ * so we set the base address to (0x4103D000 - 0xD000 = 0x41030000)
+ */
+static void *base_mports = (void *)(AIPS0_BASE + 0x30000);
+
+/*
+ * configures a single pad in the iomuxer
+ */
+void mx7ulp_iomux_setup_pad(iomux_cfg_t pad)
+{
+	u32 mux_ctrl_ofs = (pad & MUX_CTRL_OFS_MASK) >> MUX_CTRL_OFS_SHIFT;
+	u32 mux_mode = (pad & MUX_MODE_MASK) >> MUX_MODE_SHIFT;
+	u32 sel_input_ofs =
+		(pad & MUX_SEL_INPUT_OFS_MASK) >> MUX_SEL_INPUT_OFS_SHIFT;
+	u32 sel_input =
+		(pad & MUX_SEL_INPUT_MASK) >> MUX_SEL_INPUT_SHIFT;
+	u32 pad_ctrl_ofs = mux_ctrl_ofs;
+	u32 pad_ctrl = (pad & MUX_PAD_CTRL_MASK) >> MUX_PAD_CTRL_SHIFT;
+
+	debug("[PAD CFG] = 0x%16llX \r\n\tmux_ctl = 0x%X(0x%X) sel_input = 0x%X(0x%X) pad_ctrl = 0x%X(0x%X)\r\n",
+	      pad, mux_ctrl_ofs, mux_mode, sel_input_ofs, sel_input,
+	      pad_ctrl_ofs, pad_ctrl);
+
+	if (mux_mode & IOMUX_CONFIG_MPORTS) {
+		mux_mode &= ~IOMUX_CONFIG_MPORTS;
+		base = base_mports;
+	} else {
+		base = (void *)IOMUXC_BASE_ADDR;
+	}
+
+	__raw_writel(((mux_mode << IOMUXC_PCR_MUX_ALT_SHIFT) &
+		     IOMUXC_PCR_MUX_ALT_MASK), base + mux_ctrl_ofs);
+
+	if (sel_input_ofs)
+		__raw_writel((sel_input << IOMUXC_PSMI_IMUX_ALT_SHIFT),
+			base + sel_input_ofs);
+
+	if (!(pad_ctrl & NO_PAD_CTRL))
+		__raw_writel(((mux_mode << IOMUXC_PCR_MUX_ALT_SHIFT) &
+			     IOMUXC_PCR_MUX_ALT_MASK) |
+			     (pad_ctrl & (~IOMUXC_PCR_MUX_ALT_MASK)),
+			     base + pad_ctrl_ofs);
+}
+
+/* configures a list of pads within declared with IOMUX_PADS macro */
+void mx7ulp_iomux_setup_multiple_pads(iomux_cfg_t const *pad_list,
+				      unsigned count)
+{
+	iomux_cfg_t const *p = pad_list;
+	int i;
+
+	for (i = 0; i < count; i++) {
+		mx7ulp_iomux_setup_pad(*p);
+		p++;
+	}
+}
diff --git a/arch/arm/include/asm/arch-mx7ulp/iomux.h b/arch/arm/include/asm/arch-mx7ulp/iomux.h
new file mode 100644
index 0000000..a2307db
--- /dev/null
+++ b/arch/arm/include/asm/arch-mx7ulp/iomux.h
@@ -0,0 +1,95 @@
+/*
+ * Based on Linux i.MX iomux-v3.h file:
+ * Copyright (C) 2009 by Jan Weitzel Phytec Messtechnik GmbH,
+ *			<armlinux@phytec.de>
+ *
+ * Copyright (C) 2016 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __MACH_IOMUX_H__
+#define __MACH_IOMUX_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 SOC_PAD_<padname>__<padmode>
+ * If <padname> or <padmode> refers to a GPIO, it is named GPIO_<unit>_<num>
+ *
+ * IOMUX/PAD Bit field definitions
+ *
+ * MUX_CTRL_OFS:	                0..15 (16)
+ * SEL_INPUT_OFS:	               16..31 (16)
+ * MUX_MODE:	                   32..37  (6)
+ * SEL_INP:		                   38..41  (4)
+ * PAD_CTRL + NO_PAD_CTRL:         42..60 (19)
+ * reserved:		               61-63      (3)
+*/
+
+typedef u64 iomux_cfg_t;
+
+#define MUX_CTRL_OFS_SHIFT	     0
+#define MUX_CTRL_OFS_MASK	((iomux_cfg_t)0xffff << MUX_CTRL_OFS_SHIFT)
+#define MUX_SEL_INPUT_OFS_SHIFT	16
+#define MUX_SEL_INPUT_OFS_MASK	((iomux_cfg_t)0xffff << \
+	MUX_SEL_INPUT_OFS_SHIFT)
+
+#define MUX_MODE_SHIFT		32
+#define MUX_MODE_MASK		((iomux_cfg_t)0x3f << MUX_MODE_SHIFT)
+#define MUX_SEL_INPUT_SHIFT	38
+#define MUX_SEL_INPUT_MASK	((iomux_cfg_t)0xf << MUX_SEL_INPUT_SHIFT)
+#define MUX_PAD_CTRL_SHIFT	42
+#define MUX_PAD_CTRL_MASK	((iomux_cfg_t)0x7ffff << MUX_PAD_CTRL_SHIFT)
+
+#define MUX_PAD_CTRL(x)		((iomux_cfg_t)(x) << MUX_PAD_CTRL_SHIFT)
+
+#define IOMUX_PAD(pad_ctrl_ofs, mux_ctrl_ofs, mux_mode, sel_input_ofs,	\
+		sel_input, pad_ctrl)					\
+	(((iomux_cfg_t)(mux_ctrl_ofs) << MUX_CTRL_OFS_SHIFT)     |	\
+	((iomux_cfg_t)(mux_mode)      << MUX_MODE_SHIFT)         |	\
+	((iomux_cfg_t)(pad_ctrl)      << MUX_PAD_CTRL_SHIFT)     |	\
+	((iomux_cfg_t)(sel_input_ofs) << MUX_SEL_INPUT_OFS_SHIFT)|	\
+	((iomux_cfg_t)(sel_input)     << MUX_SEL_INPUT_SHIFT))
+
+#define NEW_PAD_CTRL(cfg, pad)	(((cfg) & ~MUX_PAD_CTRL_MASK) | \
+					MUX_PAD_CTRL(pad))
+
+
+#define IOMUX_CONFIG_MPORTS       0x20
+#define MUX_MODE_MPORTS           ((iomux_v3_cfg_t)IOMUX_CONFIG_MPORTS << \
+				MUX_MODE_SHIFT)
+
+/* Bit definition below needs to be fixed acccording to ulp rm */
+
+#define NO_PAD_CTRL		     (1 << 18)
+#define PAD_CTL_OBE_ENABLE	 (1 << 17)
+#define PAD_CTL_IBE_ENABLE	 (1 << 16)
+#define PAD_CTL_DSE          (1 << 6)
+#define PAD_CTL_ODE          (1 << 5)
+#define PAD_CTL_SRE_FAST     (0 << 2)
+#define PAD_CTL_SRE_SLOW     (1 << 2)
+#define PAD_CTL_PUE          (1 << 1)
+#define PAD_CTL_PUS_UP       ((1 << 0) | PAD_CTL_PUE)
+#define PAD_CTL_PUS_DOWN     ((0 << 0) | PAD_CTL_PUE)
+
+
+void mx7ulp_iomux_setup_pad(iomux_cfg_t pad);
+void mx7ulp_iomux_setup_multiple_pads(iomux_cfg_t const *pad_list,
+				      unsigned count);
+#endif	/* __MACH_IOMUX_H__*/