[U-Boot] [PATCH v2 01/18] pinctrl: uniphier: add UniPhier pinctrl core support
Masahiro Yamada
yamada.masahiro at socionext.com
Fri Sep 11 13:17:32 CEST 2015
The core support for the pinctrl drivers for all the UniPhier SoCs.
Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>
Reviewed-by: Simon Glass <sjg at chromium.org>
---
Changes in v2:
- add comments to structures
- re-design to maximize code re-use of Linux pinctrl drivers
- implement input enabling
drivers/pinctrl/Kconfig | 2 +
drivers/pinctrl/Makefile | 2 +
drivers/pinctrl/uniphier/Kconfig | 6 +
drivers/pinctrl/uniphier/Makefile | 1 +
drivers/pinctrl/uniphier/pinctrl-uniphier-core.c | 154 +++++++++++++++++++++++
drivers/pinctrl/uniphier/pinctrl-uniphier.h | 113 +++++++++++++++++
6 files changed, 278 insertions(+)
create mode 100644 drivers/pinctrl/uniphier/Kconfig
create mode 100644 drivers/pinctrl/uniphier/Makefile
create mode 100644 drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
create mode 100644 drivers/pinctrl/uniphier/pinctrl-uniphier.h
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index b8146df..3b6e3b7 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -124,4 +124,6 @@ config PINCTRL_SANDBOX
endif
+source "drivers/pinctrl/uniphier/Kconfig"
+
endmenu
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index f537df4..e56a17f 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -3,3 +3,5 @@ obj-$(CONFIG_$(SPL_)PINCTRL_GENERIC) += pinctrl-generic.o
obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/
obj-$(CONFIG_PINCTRL_SANDBOX) += pinctrl-sandbox.o
+
+obj-$(CONFIG_ARCH_UNIPHIER) += uniphier/
diff --git a/drivers/pinctrl/uniphier/Kconfig b/drivers/pinctrl/uniphier/Kconfig
new file mode 100644
index 0000000..29a623d
--- /dev/null
+++ b/drivers/pinctrl/uniphier/Kconfig
@@ -0,0 +1,6 @@
+if ARCH_UNIPHIER
+
+config PINCTRL_UNIPHIER_CORE
+ bool
+
+endif
diff --git a/drivers/pinctrl/uniphier/Makefile b/drivers/pinctrl/uniphier/Makefile
new file mode 100644
index 0000000..748aa1b
--- /dev/null
+++ b/drivers/pinctrl/uniphier/Makefile
@@ -0,0 +1 @@
+obj-$(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 at 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 at 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__ */
--
1.9.1
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