AT91 PIO4 controller is a combined gpio-controller, pin-mux and pin-config module. The peripheral's pins are assigned through per-pin based muxing logic.
The pin configuration is performed on specific registers which are shared along with the gpio controller. So regard the pinctrl device as a child of atmel_pio4 device.
Signed-off-by: Wenyou Yang wenyou.yang@atmel.com Reviewed-by: Simon Glass sjg@chromium.org ---
Changes in v5: - Fixed the return value, -ENODEV->-EINVAL. - Remove check on dev_get_parent() return.
Changes in v4: None Changes in v3: - Rework due to the pinctrl device is regarded as atmel_pio4 device's child.
Changes in v2: - remove meaningless comment. - add else path for argument of pinconf. - add inline attribute for atmel_pio4_bank_base(). - add handle if the pinmux entries is greater maximum value.
drivers/pinctrl/Kconfig | 7 ++ drivers/pinctrl/Makefile | 1 + drivers/pinctrl/pinctrl-at91-pio4.c | 182 ++++++++++++++++++++++++++++++++++++ 3 files changed, 190 insertions(+) create mode 100644 drivers/pinctrl/pinctrl-at91-pio4.c
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig index 1785e3b..01ce740 100644 --- a/drivers/pinctrl/Kconfig +++ b/drivers/pinctrl/Kconfig @@ -123,6 +123,13 @@ config QCA953X_PINCTRL both the GPIO definitions and pin control functions for each available multiplex function.
+config PINCTRL_AT91PIO4 + bool "AT91 PIO4 pinctrl driver" + depends on DM + help + This option is to enable the AT91 pinctrl driver for AT91 PIO4 + controller which is available on SAMA5D2 SoC. + config ROCKCHIP_PINCTRL bool "Rockchip pin control driver" depends on DM diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile index 7f94681..c92ab8c 100644 --- a/drivers/pinctrl/Makefile +++ b/drivers/pinctrl/Makefile @@ -5,6 +5,7 @@ obj-y += pinctrl-uclass.o obj-$(CONFIG_$(SPL_)PINCTRL_GENERIC) += pinctrl-generic.o
+obj-$(CONFIG_PINCTRL_AT91PIO4) += pinctrl-at91-pio4.o obj-y += nxp/ obj-$(CONFIG_ARCH_ATH79) += ath79/ obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/ diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c new file mode 100644 index 0000000..6d4aadc --- /dev/null +++ b/drivers/pinctrl/pinctrl-at91-pio4.c @@ -0,0 +1,182 @@ +/* + * Atmel PIO4 pinctrl driver + * + * Copyright (C) 2016 Atmel Corporation + * Wenyou.Yang wenyou.yang@atmel.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm/device.h> +#include <dm/pinctrl.h> +#include <linux/io.h> +#include <linux/err.h> +#include <mach/atmel_pio4.h> + +DECLARE_GLOBAL_DATA_PTR; + +/* + * Warning: + * In order to not introduce confusion between Atmel PIO groups and pinctrl + * framework groups, Atmel PIO groups will be called banks. + */ + +struct atmel_pio4_platdata { + struct atmel_pio4_port *reg_base; +}; + +static const struct pinconf_param conf_params[] = { + { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 }, + { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 }, + { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 }, + { "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 }, + { "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 }, + { "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 }, + { "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 }, +}; + +static u32 atmel_pinctrl_get_pinconf(const void *blob, int node) +{ + const struct pinconf_param *params; + u32 param, arg, conf = 0; + u32 i; + + for (i = 0; i < ARRAY_SIZE(conf_params); i++) { + params = &conf_params[i]; + if (!fdt_get_property(blob, node, params->property, NULL)) + continue; + + param = params->param; + arg = params->default_value; + + switch (param) { + case PIN_CONFIG_BIAS_DISABLE: + conf &= (~ATMEL_PIO_PUEN_MASK); + conf &= (~ATMEL_PIO_PDEN_MASK); + break; + case PIN_CONFIG_BIAS_PULL_UP: + conf |= ATMEL_PIO_PUEN_MASK; + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + conf |= ATMEL_PIO_PDEN_MASK; + break; + case PIN_CONFIG_DRIVE_OPEN_DRAIN: + if (arg == 0) + conf &= (~ATMEL_PIO_OPD_MASK); + else + conf |= ATMEL_PIO_OPD_MASK; + break; + case PIN_CONFIG_INPUT_SCHMITT_ENABLE: + if (arg == 0) + conf |= ATMEL_PIO_SCHMITT_MASK; + else + conf &= (~ATMEL_PIO_SCHMITT_MASK); + break; + case PIN_CONFIG_INPUT_DEBOUNCE: + if (arg == 0) { + conf &= (~ATMEL_PIO_IFEN_MASK); + conf &= (~ATMEL_PIO_IFSCEN_MASK); + } else { + conf |= ATMEL_PIO_IFEN_MASK; + conf |= ATMEL_PIO_IFSCEN_MASK; + } + break; + default: + printf("%s: Unsupported configuration parameter: %u\n", + __func__, param); + break; + } + } + + return conf; +} + +static inline struct atmel_pio4_port *atmel_pio4_bank_base(struct udevice *dev, + u32 bank) +{ + struct atmel_pio4_platdata *plat = dev_get_platdata(dev); + struct atmel_pio4_port *bank_base = + (struct atmel_pio4_port *)((u32)plat->reg_base + + ATMEL_PIO_BANK_OFFSET * bank); + + return bank_base; +} + +#define MAX_PINMUX_ENTRIES 40 + +static int atmel_pinctrl_set_state(struct udevice *dev, struct udevice *config) +{ + struct atmel_pio4_port *bank_base; + const void *blob = gd->fdt_blob; + int node = config->of_offset; + u32 offset, func, bank, line; + u32 cells[MAX_PINMUX_ENTRIES]; + u32 i, conf; + int count; + + conf = atmel_pinctrl_get_pinconf(blob, node); + + count = fdtdec_get_int_array_count(blob, node, "pinmux", + cells, ARRAY_SIZE(cells)); + if (count < 0) { + printf("%s: bad pinmux array %d\n", __func__, count); + return -EINVAL; + } + + if (count > MAX_PINMUX_ENTRIES) { + printf("%s: unsupported pinmux array count %d\n", + __func__, count); + return -EINVAL; + } + + for (i = 0 ; i < count; i++) { + offset = ATMEL_GET_PIN_NO(cells[i]); + func = ATMEL_GET_PIN_FUNC(cells[i]); + + bank = ATMEL_PIO_BANK(offset); + line = ATMEL_PIO_LINE(offset); + + bank_base = atmel_pio4_bank_base(dev, bank); + + writel(BIT(line), &bank_base->mskr); + conf &= (~ATMEL_PIO_CFGR_FUNC_MASK); + conf |= (func & ATMEL_PIO_CFGR_FUNC_MASK); + writel(conf, &bank_base->cfgr); + } + + return 0; +} + +const struct pinctrl_ops atmel_pinctrl_ops = { + .set_state = atmel_pinctrl_set_state, +}; + +static int atmel_pinctrl_probe(struct udevice *dev) +{ + struct atmel_pio4_platdata *plat = dev_get_platdata(dev); + fdt_addr_t addr_base; + + dev = dev_get_parent(dev); + addr_base = dev_get_addr(dev); + if (addr_base == FDT_ADDR_T_NONE) + return -EINVAL; + + plat->reg_base = (struct atmel_pio4_port *)addr_base; + + return 0; +} + +static const struct udevice_id atmel_pinctrl_match[] = { + { .compatible = "atmel,sama5d2-pinctrl" }, + {} +}; + +U_BOOT_DRIVER(atmel_pinctrl) = { + .name = "pinctrl_atmel_pio4", + .id = UCLASS_PINCTRL, + .of_match = atmel_pinctrl_match, + .probe = atmel_pinctrl_probe, + .platdata_auto_alloc_size = sizeof(struct atmel_pio4_platdata), + .ops = &atmel_pinctrl_ops, +};