diff --git a/configs/stm32f746-disco_defconfig b/configs/stm32f746-disco_defconfig index 8fcab9db75..b5457c6a24 100644 --- a/configs/stm32f746-disco_defconfig +++ b/configs/stm32f746-disco_defconfig @@ -40,3 +40,6 @@ CONFIG_STM32_QSPI=y CONFIG_OF_LIBFDT_OVERLAY=y # CONFIG_EFI_LOADER is not set CONFIG_CLK=y +CONFIG_PINCTRL=y +# CONFIG_PINCTRL_FULL is not set +CONFIG_PINCTRL_STM32=y diff --git a/doc/device-tree-bindings/pinctrl/st,stm32-pinctrl.txt b/doc/device-tree-bindings/pinctrl/st,stm32-pinctrl.txt new file mode 100644 index 0000000000..c41ae91f7a --- /dev/null +++ b/doc/device-tree-bindings/pinctrl/st,stm32-pinctrl.txt @@ -0,0 +1,133 @@ +* STM32 GPIO and Pin Mux/Config controller + +STMicroelectronics's STM32 MCUs intregrate a GPIO and Pin mux/config hardware +controller. It controls the input/output settings on the available pins and +also provides ability to multiplex and configure the output of various on-chip +controllers onto these pads. + +Pin controller node: +Required properies: + - compatible: value should be one of the following: + (a) "st,stm32f429-pinctrl" + (b) "st,stm32f746-pinctrl" + - #address-cells: The value of this property must be 1 + - #size-cells : The value of this property must be 1 + - ranges : defines mapping between pin controller node (parent) to + gpio-bank node (children). + - pins-are-numbered: Specify the subnodes are using numbered pinmux to + specify pins. + +GPIO controller/bank node: +Required properties: + - gpio-controller : Indicates this device is a GPIO controller + - #gpio-cells : Should be two. + The first cell is the pin number + The second one is the polarity: + - 0 for active high + - 1 for active low + - reg : The gpio address range, relative to the pinctrl range + - clocks : clock that drives this bank + - st,bank-name : Should be a name string for this bank as specified in + the datasheet + +Optional properties: + - reset: : Reference to the reset controller + - interrupt-parent: phandle of the interrupt parent to which the external + GPIO interrupts are forwarded to. + - st,syscfg: Should be phandle/offset pair. The phandle to the syscon node + which includes IRQ mux selection register, and the offset of the IRQ mux + selection register. + +Example: +#include +... + + pin-controller { + #address-cells = <1>; + #size-cells = <1>; + compatible = "st,stm32f429-pinctrl"; + ranges = <0 0x40020000 0x3000>; + pins-are-numbered; + + gpioa: gpio@40020000 { + gpio-controller; + #gpio-cells = <2>; + reg = <0x0 0x400>; + resets = <&reset_ahb1 0>; + st,bank-name = "GPIOA"; + }; + ... + pin-functions nodes follow... + }; + +Contents of function subnode node: +---------------------------------- +Subnode format +A pinctrl node should contain at least one subnode representing the +pinctrl group available on the machine. Each subnode will list the +pins it needs, and how they should be configured, with regard to muxer +configuration, pullups, drive, output high/low and output speed. + + node { + pinmux = ; + GENERIC_PINCONFIG; + }; + +Required properties: +- pinmux: integer array, represents gpio pin number and mux setting. + Supported pin number and mux varies for different SoCs, and are defined in + dt-bindings/pinctrl/-pinfunc.h directly. + These defines are calculated as: + ((port * 16 + line) << 8) | function + With: + - port: The gpio port index (PA = 0, PB = 1, ..., PK = 11) + - line: The line offset within the port (PA0 = 0, PA1 = 1, ..., PA15 = 15) + - function: The function number, can be: + * 0 : GPIO IN + * 1 : Alternate Function 0 + * 2 : Alternate Function 1 + * 3 : Alternate Function 2 + * ... + * 16 : Alternate Function 15 + * 17 : Analog + * 18 : GPIO OUT + +Optional properties: +- GENERIC_PINCONFIG: is the generic pinconfig options to use. + Available options are: + - bias-disable, + - bias-pull-down, + - bias-pull-up, + - drive-push-pull, + - drive-open-drain, + - output-low + - output-high + - slew-rate = , with x being: + < 0 > : Low speed + < 1 > : Medium speed + < 2 > : Fast speed + < 3 > : High speed + +Example: + +pin-controller { +... + usart1_pins_a: usart1@0 { + pins1 { + pinmux = ; + bias-disable; + drive-push-pull; + slew-rate = <0>; + }; + pins2 { + pinmux = ; + bias-disable; + }; + }; +}; + +&usart1 { + pinctrl-0 = <&usart1_pins_a>; + pinctrl-names = "default"; + status = "okay"; +}; diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig index 0c832e187d..d011dad889 100644 --- a/drivers/pinctrl/Kconfig +++ b/drivers/pinctrl/Kconfig @@ -185,6 +185,15 @@ config PINCTRL_STI the GPIO definitions and pin control functions for each available multiplex function. +config PINCTRL_STM32 + bool "ST STM32 pin control driver" + depends on DM + help + Supports pin multiplexing control on stm32 SoCs. The driver is + controlled by a device tree node which contains both the GPIO + definitions and pin control functions for each available multiplex + function. + endif source "drivers/pinctrl/meson/Kconfig" diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile index a2f810156b..b04ca86e1d 100644 --- a/drivers/pinctrl/Makefile +++ b/drivers/pinctrl/Makefile @@ -17,3 +17,4 @@ obj-$(CONFIG_PINCTRL_EXYNOS) += exynos/ obj-$(CONFIG_PINCTRL_MESON) += meson/ obj-$(CONFIG_PINCTRL_MVEBU) += mvebu/ obj-$(CONFIG_PINCTRL_STI) += pinctrl-sti.o +obj-$(CONFIG_PINCTRL_STM32) += pinctrl_stm32.o diff --git a/drivers/pinctrl/pinctrl_stm32.c b/drivers/pinctrl/pinctrl_stm32.c new file mode 100644 index 0000000000..aa2c440b14 --- /dev/null +++ b/drivers/pinctrl/pinctrl_stm32.c @@ -0,0 +1,117 @@ +#include +#include +#include +#include + +DECLARE_GLOBAL_DATA_PTR; + +static int prep_gpio_dsc(struct stm32_gpio_dsc *gpio_dsc, u32 port_pin) +{ + gpio_dsc->port = (port_pin & 0xF000) >> 12; + gpio_dsc->pin = (port_pin & 0x0F00) >> 8; + debug("%s: GPIO:port= %d, pin= %d\n", __func__, gpio_dsc->port, + gpio_dsc->pin); + + return 0; +} + +static int prep_gpio_ctl(struct stm32_gpio_ctl *gpio_ctl, u32 gpio_fn, int node) +{ + gpio_fn &= 0x00FF; + + switch (gpio_fn) { + case 0: + gpio_ctl->mode = STM32_GPIO_MODE_IN; + break; + case 1 ... 16: + gpio_ctl->mode = STM32_GPIO_MODE_AF; + gpio_ctl->af = gpio_fn - 1; + break; + case 17: + gpio_ctl->mode = STM32_GPIO_MODE_AN; + break; + default: + gpio_ctl->mode = STM32_GPIO_MODE_OUT; + break; + } + + gpio_ctl->speed = fdtdec_get_int(gd->fdt_blob, node, "slew-rate", 0); + + if (fdtdec_get_bool(gd->fdt_blob, node, "drive-open-drain")) + gpio_ctl->otype = STM32_GPIO_OTYPE_OD; + else + gpio_ctl->otype = STM32_GPIO_OTYPE_PP; + + if (fdtdec_get_bool(gd->fdt_blob, node, "bias-pull-up")) + gpio_ctl->pupd = STM32_GPIO_PUPD_UP; + else if (fdtdec_get_bool(gd->fdt_blob, node, "bias-pull-down")) + gpio_ctl->pupd = STM32_GPIO_PUPD_DOWN; + else + gpio_ctl->pupd = STM32_GPIO_PUPD_NO; + + debug("%s: gpio fn= %d, slew-rate= %x, op type= %x, pull-upd is = %x\n", + __func__, gpio_fn, gpio_ctl->speed, gpio_ctl->otype, + gpio_ctl->pupd); + + return 0; +} + +static int stm32_pinctrl_set_state_simple(struct udevice *dev, + struct udevice *periph) +{ + u32 pin_mux[50]; + struct fdtdec_phandle_args args; + int rv, len; + + /* Get node pinctrl-0 */ + rv = fdtdec_parse_phandle_with_args(gd->fdt_blob, periph->of_offset, + "pinctrl-0", 0, 0, 0, &args); + if (rv) + return rv; + /* + * check for "pinmux" property in each subnode (e.g. pins1 and pins2 for + * usart1) of pin controller phandle "pinctrl-0" + * */ + fdt_for_each_subnode(args.node, gd->fdt_blob, args.node) { + struct stm32_gpio_dsc gpio_dsc; + struct stm32_gpio_ctl gpio_ctl; + int i; + + len = fdtdec_get_int_array_count(gd->fdt_blob, args.node, + "pinmux", pin_mux, + ARRAY_SIZE(pin_mux)); + debug("%s: periph->name = %s, no of pinmux entries= %d\n", + __func__, periph->name, len); + if (len < 0) + return -EINVAL; + for (i = 0; i < len; i++) { + debug("%s: pinmux = %x\n", __func__, *(pin_mux + i)); + prep_gpio_dsc(&gpio_dsc, *(pin_mux + i)); + prep_gpio_ctl(&gpio_ctl, *(pin_mux + i), args.node); + + rv = stm32_gpio_config(&gpio_dsc, &gpio_ctl); + debug("%s: rv = %d\n\n", __func__, rv); + if (rv) + return rv; + } + } + + return 0; +} + +static struct pinctrl_ops stm32_pinctrl_ops = { + .set_state_simple = stm32_pinctrl_set_state_simple, +}; + +static const struct udevice_id stm32_pinctrl_ids[] = { + { .compatible = "st,stm32f746-pinctrl" }, + { } +}; + +U_BOOT_DRIVER(pinctrl_stm32) = { + .name = "pinctrl_stm32", + .id = UCLASS_PINCTRL, + .of_match = stm32_pinctrl_ids, + .ops = &stm32_pinctrl_ops, + .bind = dm_scan_fdt_dev, +};