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 ---
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@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__ */