v4.19.13 snapshot.
diff --git a/arch/arm/mach-imx/iomux-imx31.c b/arch/arm/mach-imx/iomux-imx31.c
new file mode 100644
index 0000000..3982e91
--- /dev/null
+++ b/arch/arm/mach-imx/iomux-imx31.c
@@ -0,0 +1,174 @@
+/*
+ * Copyright 2004-2006 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.de>
+ * Copyright (C) 2009 by Valentin Longchamp <valentin.longchamp@epfl.ch>
+ *
+ * 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/gpio.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+
+#include "hardware.h"
+#include "iomux-mx3.h"
+
+/*
+ * IOMUX register (base) addresses
+ */
+#define IOMUX_BASE MX31_IO_ADDRESS(MX31_IOMUXC_BASE_ADDR)
+#define IOMUXINT_OBS1 (IOMUX_BASE + 0x000)
+#define IOMUXINT_OBS2 (IOMUX_BASE + 0x004)
+#define IOMUXGPR (IOMUX_BASE + 0x008)
+#define IOMUXSW_MUX_CTL (IOMUX_BASE + 0x00C)
+#define IOMUXSW_PAD_CTL (IOMUX_BASE + 0x154)
+
+static DEFINE_SPINLOCK(gpio_mux_lock);
+
+#define IOMUX_REG_MASK (IOMUX_PADNUM_MASK & ~0x3)
+
+static DECLARE_BITMAP(mxc_pin_alloc_map, NB_PORTS * 32);
+/*
+ * set the mode for a IOMUX pin.
+ */
+void mxc_iomux_mode(unsigned int pin_mode)
+{
+ u32 field;
+ u32 l;
+ u32 mode;
+ void __iomem *reg;
+
+ reg = IOMUXSW_MUX_CTL + (pin_mode & IOMUX_REG_MASK);
+ field = pin_mode & 0x3;
+ mode = (pin_mode & IOMUX_MODE_MASK) >> IOMUX_MODE_SHIFT;
+
+ spin_lock(&gpio_mux_lock);
+
+ l = imx_readl(reg);
+ l &= ~(0xff << (field * 8));
+ l |= mode << (field * 8);
+ imx_writel(l, reg);
+
+ spin_unlock(&gpio_mux_lock);
+}
+
+/*
+ * This function configures the pad value for a IOMUX pin.
+ */
+void mxc_iomux_set_pad(enum iomux_pins pin, u32 config)
+{
+ u32 field, l;
+ void __iomem *reg;
+
+ pin &= IOMUX_PADNUM_MASK;
+ reg = IOMUXSW_PAD_CTL + (pin + 2) / 3 * 4;
+ field = (pin + 2) % 3;
+
+ pr_debug("%s: reg offset = 0x%x, field = %d\n",
+ __func__, (pin + 2) / 3, field);
+
+ spin_lock(&gpio_mux_lock);
+
+ l = imx_readl(reg);
+ l &= ~(0x1ff << (field * 10));
+ l |= config << (field * 10);
+ imx_writel(l, reg);
+
+ spin_unlock(&gpio_mux_lock);
+}
+
+/*
+ * allocs 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_alloc_pin(unsigned int pin, const char *label)
+{
+ unsigned pad = pin & IOMUX_PADNUM_MASK;
+
+ if (pad >= (PIN_MAX + 1)) {
+ printk(KERN_ERR "mxc_iomux: Attempt to request nonexistent pin %u for \"%s\"\n",
+ pad, label ? label : "?");
+ return -EINVAL;
+ }
+
+ if (test_and_set_bit(pad, mxc_pin_alloc_map)) {
+ printk(KERN_ERR "mxc_iomux: pin %u already used. Allocation for \"%s\" failed\n",
+ pad, label ? label : "?");
+ return -EBUSY;
+ }
+ mxc_iomux_mode(pin);
+
+ return 0;
+}
+
+int mxc_iomux_setup_multiple_pins(const unsigned int *pin_list, unsigned count,
+ const char *label)
+{
+ const unsigned int *p = pin_list;
+ int i;
+ int ret = -EINVAL;
+
+ for (i = 0; i < count; i++) {
+ ret = mxc_iomux_alloc_pin(*p, label);
+ if (ret)
+ goto setup_error;
+ p++;
+ }
+ return 0;
+
+setup_error:
+ mxc_iomux_release_multiple_pins(pin_list, i);
+ return ret;
+}
+
+void mxc_iomux_release_pin(unsigned int pin)
+{
+ unsigned pad = pin & IOMUX_PADNUM_MASK;
+
+ if (pad < (PIN_MAX + 1))
+ clear_bit(pad, mxc_pin_alloc_map);
+}
+
+void mxc_iomux_release_multiple_pins(const unsigned int *pin_list, int count)
+{
+ const unsigned int *p = pin_list;
+ int i;
+
+ for (i = 0; i < count; i++) {
+ mxc_iomux_release_pin(*p);
+ p++;
+ }
+}
+
+/*
+ * This function enables/disables the general purpose function for a particular
+ * signal.
+ */
+void mxc_iomux_set_gpr(enum iomux_gp_func gp, bool en)
+{
+ u32 l;
+
+ spin_lock(&gpio_mux_lock);
+ l = imx_readl(IOMUXGPR);
+ if (en)
+ l |= gp;
+ else
+ l &= ~gp;
+
+ imx_writel(l, IOMUXGPR);
+ spin_unlock(&gpio_mux_lock);
+}