pinctrl: uniphier: add UniPhier pinctrl core support

The core support for the pinctrl drivers for all the UniPhier SoCs.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

4 files changed, 274 insertions, 0 deletions

diff --git a/drivers/pinctrl/uniphier/Kconfig b/drivers/pinctrl/uniphier/Kconfig
new file mode 100644
index 0000000..29a623d
--- /dev/null
+++ b/drivers/pinctrl/uniphier/Kconfig
@@ -0,0 +1,6 @@
+if ARCH_UNIPHIER
+
+config PINCTRL_UNIPHIER_CORE
+	bool
+
+endif
diff --git a/drivers/pinctrl/uniphier/Makefile b/drivers/pinctrl/uniphier/Makefile
new file mode 100644
index 0000000..748aa1b
--- /dev/null
+++ b/drivers/pinctrl/uniphier/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_PINCTRL_UNIPHIER_CORE)		+= pinctrl-uniphier-core.o
diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c b/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
new file mode 100644
index 0000000..37a920c
--- /dev/null
+++ b/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
@@ -0,0 +1,154 @@
+/*
+ * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <mapmem.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <dm/device.h>
+#include <dm/pinctrl.h>
+
+#include "pinctrl-uniphier.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int uniphier_pinctrl_get_groups_count(struct udevice *dev)
+{
+	struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
+
+	return priv->socdata->groups_count;
+}
+
+static const char *uniphier_pinctrl_get_group_name(struct udevice *dev,
+						   unsigned selector)
+{
+	struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
+
+	return priv->socdata->groups[selector].name;
+}
+
+static int uniphier_pinmux_get_functions_count(struct udevice *dev)
+{
+	struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
+
+	return priv->socdata->functions_count;
+}
+
+static const char *uniphier_pinmux_get_function_name(struct udevice *dev,
+						     unsigned selector)
+{
+	struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
+
+	return priv->socdata->functions[selector];
+}
+
+static void uniphier_pinconf_input_enable(struct udevice *dev, unsigned pin)
+{
+	struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
+	int pins_count = priv->socdata->pins_count;
+	const struct uniphier_pinctrl_pin *pins = priv->socdata->pins;
+	int i;
+
+	for (i = 0; i < pins_count; i++) {
+		if (pins[i].number == pin) {
+			unsigned int iectrl;
+			u32 tmp;
+
+			iectrl = uniphier_pin_get_iectrl(pins[i].data);
+			tmp = readl(priv->base + UNIPHIER_PINCTRL_IECTRL);
+			tmp |= 1 << iectrl;
+			writel(tmp, priv->base + UNIPHIER_PINCTRL_IECTRL);
+		}
+	}
+}
+
+static void uniphier_pinmux_set_one(struct udevice *dev, unsigned pin,
+				    unsigned muxval)
+{
+	struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
+	unsigned mux_bits = priv->socdata->mux_bits;
+	unsigned reg_stride = priv->socdata->reg_stride;
+	unsigned reg, reg_end, shift, mask;
+	u32 tmp;
+
+	reg = UNIPHIER_PINCTRL_PINMUX_BASE + pin * mux_bits / 32 * reg_stride;
+	reg_end = reg + reg_stride;
+	shift = pin * mux_bits % 32;
+	mask = (1U << mux_bits) - 1;
+
+	/*
+	 * If reg_stride is greater than 4, the MSB of each pinsel shall be
+	 * stored in the offset+4.
+	 */
+	for (; reg < reg_end; reg += 4) {
+		tmp = readl(priv->base + reg);
+		tmp &= ~(mask << shift);
+		tmp |= (mask & muxval) << shift;
+		writel(tmp, priv->base + reg);
+
+		muxval >>= mux_bits;
+	}
+
+	if (priv->socdata->load_pinctrl)
+		writel(1, priv->base + UNIPHIER_PINCTRL_LOAD_PINMUX);
+
+	/* some pins need input-enabling */
+	uniphier_pinconf_input_enable(dev, pin);
+}
+
+static int uniphier_pinmux_group_set(struct udevice *dev,
+				     unsigned group_selector,
+				     unsigned func_selector)
+{
+	struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
+	const struct uniphier_pinctrl_group *grp =
+					&priv->socdata->groups[group_selector];
+	int i;
+
+	for (i = 0; i < grp->num_pins; i++)
+		uniphier_pinmux_set_one(dev, grp->pins[i], grp->muxvals[i]);
+
+	return 0;
+}
+
+const struct pinctrl_ops uniphier_pinctrl_ops = {
+	.get_groups_count = uniphier_pinctrl_get_groups_count,
+	.get_group_name = uniphier_pinctrl_get_group_name,
+	.get_functions_count = uniphier_pinmux_get_functions_count,
+	.get_function_name = uniphier_pinmux_get_function_name,
+	.pinmux_group_set = uniphier_pinmux_group_set,
+	.set_state = pinctrl_generic_set_state,
+};
+
+int uniphier_pinctrl_probe(struct udevice *dev,
+			   struct uniphier_pinctrl_socdata *socdata)
+{
+	struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
+	fdt_addr_t addr;
+	fdt_size_t size;
+
+	addr = fdtdec_get_addr_size(gd->fdt_blob, dev->of_offset, "reg",
+				    &size);
+	if (addr == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	priv->base = map_sysmem(addr, size);
+	if (!priv->base)
+		return -ENOMEM;
+
+	priv->socdata = socdata;
+
+	return 0;
+}
+
+int uniphier_pinctrl_remove(struct udevice *dev)
+{
+	struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
+
+	unmap_sysmem(priv->base);
+
+	return 0;
+}
diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier.h b/drivers/pinctrl/uniphier/pinctrl-uniphier.h
new file mode 100644
index 0000000..7eaec6a
--- /dev/null
+++ b/drivers/pinctrl/uniphier/pinctrl-uniphier.h
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __PINCTRL_UNIPHIER_H__
+#define __PINCTRL_UNIPHIER_H__
+
+/* TODO: move this to include/linux/bug.h */
+#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+
+#define UNIPHIER_PINCTRL_PINMUX_BASE	0x0
+#define UNIPHIER_PINCTRL_LOAD_PINMUX	0x700
+#define UNIPHIER_PINCTRL_IECTRL		0xd00
+
+#define UNIPHIER_PIN_ATTR_PACKED(iectrl)	(iectrl)
+
+static inline unsigned int uniphier_pin_get_iectrl(unsigned long data)
+{
+	return data;
+}
+
+/**
+ * struct uniphier_pinctrl_pin - pin data for UniPhier SoC
+ *
+ * @number: pin number
+ * @data: additional per-pin data
+ */
+struct uniphier_pinctrl_pin {
+	unsigned number;
+	unsigned long data;
+};
+
+/**
+ * struct uniphier_pinctrl_group - pin group data for UniPhier SoC
+ *
+ * @name: pin group name
+ * @pins: array of pins that belong to the group
+ * @num_pins: number of pins in the group
+ * @muxvals: array of values to be set to pinmux registers
+ */
+struct uniphier_pinctrl_group {
+	const char *name;
+	const unsigned *pins;
+	unsigned num_pins;
+	const unsigned *muxvals;
+};
+
+/**
+ * struct uniphier_pinctrl_socdata - SoC data for UniPhier pin controller
+ *
+ * @pins: array of pin data
+ * @pins_count: number of pin data
+ * @groups: array of pin group data
+ * @groups_count: number of pin group data
+ * @functions: array of pinmux function names
+ * @functions_count: number of pinmux functions
+ * @mux_bits: bit width of each pinmux register
+ * @reg_stride: stride of pinmux register address
+ * @load_pinctrl: if true, LOAD_PINMUX register must be set to one for new
+ *		  values in pinmux registers to become really effective
+ */
+struct uniphier_pinctrl_socdata {
+	const struct uniphier_pinctrl_pin *pins;
+	int pins_count;
+	const struct uniphier_pinctrl_group *groups;
+	int groups_count;
+	const char * const *functions;
+	int functions_count;
+	unsigned mux_bits;
+	unsigned reg_stride;
+	bool load_pinctrl;
+};
+
+#define UNIPHIER_PINCTRL_PIN(a, b)					\
+{									\
+	.number = a,							\
+	.data = UNIPHIER_PIN_ATTR_PACKED(b),				\
+}
+
+#define UNIPHIER_PINCTRL_GROUP(grp)					\
+	{								\
+		.name = #grp,						\
+		.pins = grp##_pins,					\
+		.num_pins = ARRAY_SIZE(grp##_pins),			\
+		.muxvals = grp##_muxvals +				\
+			BUILD_BUG_ON_ZERO(ARRAY_SIZE(grp##_pins) !=	\
+					  ARRAY_SIZE(grp##_muxvals)),	\
+	}
+
+/**
+ * struct uniphier_pinctrl_priv - private data for UniPhier pinctrl driver
+ *
+ * @base: base address of the pinctrl device
+ * @socdata: SoC specific data
+ */
+struct uniphier_pinctrl_priv {
+	void __iomem *base;
+	struct uniphier_pinctrl_socdata *socdata;
+};
+
+extern const struct pinctrl_ops uniphier_pinctrl_ops;
+
+int uniphier_pinctrl_probe(struct udevice *dev,
+			   struct uniphier_pinctrl_socdata *socdata);
+
+int uniphier_pinctrl_remove(struct udevice *dev);
+
+#endif /* __PINCTRL_UNIPHIER_H__ */