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>

2 files changed, 78 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++;
+	}
+}