i.MX: Add pinctrl driver for VF610

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers/pinctrl/Kconfig

@@ -77,4 +77,9 @@ config PINCTRL_TEGRA_XUSB
 
 source drivers/pinctrl/mvebu/Kconfig
 
+config PINCTRL_VF610
+	bool
+	default y if ARCH_VF610
+	help
+	  Pinmux controller found on Vybrid VF610 family of SoCs
 endif

drivers/pinctrl/Makefile

@@ -9,5 +9,6 @@ obj-$(CONFIG_PINCTRL_SINGLE) += pinctrl-single.o
 obj-$(CONFIG_PINCTRL_TEGRA20) += pinctrl-tegra20.o
 obj-$(CONFIG_PINCTRL_TEGRA30) += pinctrl-tegra30.o
 obj-$(CONFIG_PINCTRL_TEGRA_XUSB) += pinctrl-tegra-xusb.o
+obj-$(CONFIG_PINCTRL_VF610) += pinctrl-vf610.o
 
 obj-$(CONFIG_ARCH_MVEBU) += mvebu/

drivers/pinctrl/pinctrl-vf610.c

@@ -0,0 +1,167 @@
+/*
+ * Copyright (c) 2016 Zodiac Inflight Innovation
+ * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ */
+
+#include <common.h>
+#include <init.h>
+#include <io.h>
+#include <of.h>
+#include <pinctrl.h>
+#include <malloc.h>
+#include <gpio.h>
+
+enum {
+	PINCTRL_VF610_MUX_LINE_SIZE = 20,
+	PINCTRL_VF610_MUX_SHIFT = 20,
+
+	PINCTRL_VF610_IBE = 1 << 0,
+	PINCTRL_VF610_OBE = 1 << 1,
+	PINCTRL_VF610_xBE = 0b11,
+};
+
+struct pinctrl_vf610 {
+	void __iomem *base;
+	struct pinctrl_device pinctrl;
+};
+
+static int pinctrl_vf610_set_state(struct pinctrl_device *pdev,
+				   struct device_node *np)
+{
+	const __be32 *list;
+	int npins, size, i;
+
+	struct pinctrl_vf610 *iomux =
+		container_of(pdev, struct pinctrl_vf610, pinctrl);
+
+	list = of_get_property(np, "fsl,pins", &size);
+	if (!list)
+		return -EINVAL;
+
+	if (!size || size % PINCTRL_VF610_MUX_LINE_SIZE) {
+		dev_err(pdev->dev, "Invalid fsl,pins property in %s\n",
+			np->full_name);
+		return -EINVAL;
+	}
+
+	npins = size / PINCTRL_VF610_MUX_LINE_SIZE;
+
+	for (i = 0; i < npins; i++) {
+		u32 mux_reg   = be32_to_cpu(*list++);
+		u32 input_reg = be32_to_cpu(*list++);
+		u32 mux_val   = be32_to_cpu(*list++);
+		u32 input_val = be32_to_cpu(*list++);
+		u32 conf_val  = be32_to_cpu(*list++);
+
+		writel(mux_val << PINCTRL_VF610_MUX_SHIFT | conf_val,
+		       iomux->base + mux_reg);
+
+		if (input_reg)
+			writel(input_val, iomux->base + input_reg);
+	}
+
+	return 0;
+}
+
+static int pinctrl_vf610_set_direction(struct pinctrl_device *pdev,
+				       unsigned int pin, bool input)
+{
+	u32 pad_cr;
+	const u32 off = pin * sizeof(u32);
+	struct pinctrl_vf610 *iomux =
+		container_of(pdev, struct pinctrl_vf610, pinctrl);
+
+	pad_cr = readl(iomux->base + off);
+
+	if (input) {
+		pad_cr |= PINCTRL_VF610_IBE;
+		pad_cr &= ~PINCTRL_VF610_OBE;
+	} else {
+		pad_cr &= ~PINCTRL_VF610_IBE;
+		pad_cr |= PINCTRL_VF610_OBE;
+	}
+
+	writel(pad_cr, iomux->base + off);
+
+	return 0;
+}
+
+static int pinctrl_vf610_get_direction(struct pinctrl_device *pdev,
+				       unsigned int pin)
+{
+	const u32 off = pin * sizeof(u32);
+	struct pinctrl_vf610 *iomux =
+		container_of(pdev, struct pinctrl_vf610, pinctrl);
+
+	const u32 pad_cr = readl(iomux->base + off);
+
+	switch (pad_cr & PINCTRL_VF610_xBE) {
+	case PINCTRL_VF610_IBE:
+		return GPIOF_DIR_IN;
+	case PINCTRL_VF610_OBE:
+		return GPIOF_DIR_OUT;
+	default:
+		return -EINVAL;
+	}
+}
+
+static struct pinctrl_ops pinctrl_vf610_ops = {
+	.set_state = pinctrl_vf610_set_state,
+	.set_direction = pinctrl_vf610_set_direction,
+	.get_direction = pinctrl_vf610_get_direction,
+};
+
+static int pinctrl_vf610_probe(struct device_d *dev)
+{
+	int ret;
+	struct resource *io;
+	struct pinctrl_vf610 *iomux;
+
+	iomux = xzalloc(sizeof(*iomux));
+
+	io = dev_request_mem_resource(dev, 0);
+	if (IS_ERR(io))
+		return PTR_ERR(io);
+
+	iomux->base = IOMEM(io->start);
+	iomux->pinctrl.dev = dev;
+	iomux->pinctrl.ops = &pinctrl_vf610_ops;
+	iomux->pinctrl.base = 0;
+	iomux->pinctrl.npins = ARCH_NR_GPIOS;
+
+	ret = pinctrl_register(&iomux->pinctrl);
+	if (ret)
+		free(iomux);
+
+	return ret;
+}
+
+static __maybe_unused struct of_device_id pinctrl_vf610_dt_ids[] = {
+	{ .compatible = "fsl,vf610-iomuxc", },
+	{ /* sentinel */ }
+};
+
+static struct driver_d pinctrl_vf610_driver = {
+	.name		= "vf610-pinctrl",
+	.probe		= pinctrl_vf610_probe,
+	.of_compatible	= DRV_OF_COMPAT(pinctrl_vf610_dt_ids),
+};
+
+static int pinctrl_vf610_init(void)
+{
+	return platform_driver_register(&pinctrl_vf610_driver);
+}
+postcore_initcall(pinctrl_vf610_init);