From: T Karthik Reddy t.karthik.reddy@xilinx.com

ZynqMP modepin driver has capability to get/set/check status of modepin gpios. These modepins are accessed using xilinx firmware. In modepin register, [3:0] bits set direction, [7:4] bits read IO, [11:8] bits set/clear IO.

Signed-off-by: T Karthik Reddy t.karthik.reddy@xilinx.com Signed-off-by: Michal Simek michal.simek@xilinx.com ---

MAINTAINERS | 1 + arch/arm/Kconfig | 1 + drivers/gpio/Kconfig | 9 ++ drivers/gpio/Makefile | 1 + drivers/gpio/zynqmp_gpio_modepin.c | 153 +++++++++++++++++++++++++++++ 5 files changed, 165 insertions(+) create mode 100644 drivers/gpio/zynqmp_gpio_modepin.c

diff --git a/MAINTAINERS b/MAINTAINERS index 36f076b377f3..d945c23e28ac 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -591,6 +591,7 @@ F: drivers/clk/clk_zynqmp.c F: driver/firmware/firmware-zynqmp.c F: drivers/fpga/zynqpl.c F: drivers/gpio/zynq_gpio.c +F: drivers/gpio/zynqmp_gpio_modepin.c F: drivers/i2c/i2c-cdns.c F: drivers/i2c/muxes/pca954x.c F: drivers/i2c/zynq_i2c.c diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 504abca0b717..f9d5234f05ce 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1190,6 +1190,7 @@ config ARCH_ZYNQMP imply FAT_WRITE imply MP imply DM_USB_GADGET + imply ZYNQMP_GPIO_MODEPIN if DM_GPIO && USB

config ARCH_TEGRA bool "NVIDIA Tegra" diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 40abc33772eb..8192ce5f676f 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -523,4 +523,13 @@ config NOMADIK_GPIO into a number of banks each with 32 GPIOs. The GPIOs for a device are defined in the device tree with one node for each bank.

+config ZYNQMP_GPIO_MODEPIN + bool "ZynqMP gpio modepin" + depends on DM_GPIO + help + This config enables the ZynqMP gpio modepin driver. ZynqMP modepin + driver will set and get the status of PS_MODE pins. These modepins + are accessed using xilinx firmware. In modepin register, [3:0] bits + set direction, [7:4] bits read IO, [11:8] bits set/clear IO. + endif diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 3c851b38c7cc..3eb77f58c11d 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -69,3 +69,4 @@ obj-$(CONFIG_NX_GPIO) += nx_gpio.o obj-$(CONFIG_SIFIVE_GPIO) += sifive-gpio.o obj-$(CONFIG_NOMADIK_GPIO) += nmk_gpio.o obj-$(CONFIG_MAX7320_GPIO) += max7320_gpio.o +obj-$(CONFIG_ZYNQMP_GPIO_MODEPIN) += zynqmp_gpio_modepin.o diff --git a/drivers/gpio/zynqmp_gpio_modepin.c b/drivers/gpio/zynqmp_gpio_modepin.c new file mode 100644 index 000000000000..078fd833959a --- /dev/null +++ b/drivers/gpio/zynqmp_gpio_modepin.c @@ -0,0 +1,153 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ZynqMP GPIO modepin driver + * + * Copyright (C) 2021 Xilinx, Inc. + */ + +#include <common.h> +#include <errno.h> +#include <asm/io.h> +#include <asm/gpio.h> +#include <dm.h> +#include <asm/arch/hardware.h> +#include <zynqmp_firmware.h> + +#define OUTEN(pin) (BIT(0) << (pin)) +#define INVAL(pin) (BIT(4) << (pin)) +#define OUTVAL(pin) (BIT(8) << (pin)) + +#define ZYNQMP_CRL_APB_BOOTPIN_CTRL_MASK 0xF0F +#define ZYNQMP_CRL_APB_BOOT_PIN_CTRL (ZYNQMP_CRL_APB_BASEADDR + \ + (0x250U)) + +static int get_gpio_modepin(u32 *ret_payload) +{ + return xilinx_pm_request(PM_MMIO_READ, ZYNQMP_CRL_APB_BOOT_PIN_CTRL, + 0, 0, 0, ret_payload); +} + +static int set_gpio_modepin(int val) +{ + return xilinx_pm_request(PM_MMIO_WRITE, ZYNQMP_CRL_APB_BOOT_PIN_CTRL, + ZYNQMP_CRL_APB_BOOTPIN_CTRL_MASK, + val, 0, NULL); +} + +static int modepin_gpio_direction_input(struct udevice *dev, + unsigned int offset) +{ + return 0; +} + +static int modepin_gpio_set_value(struct udevice *dev, unsigned int offset, + int value) +{ + u32 ret_payload[PAYLOAD_ARG_CNT]; + u32 out_val = 0; + int ret; + + ret = get_gpio_modepin(ret_payload); + if (value) + out_val = OUTVAL(offset) | ret_payload[1]; + else + out_val = ~OUTVAL(offset) & ret_payload[1]; + + return set_gpio_modepin(out_val); +} + +static int modepin_gpio_direction_output(struct udevice *dev, + unsigned int offset, int value) +{ + u32 ret_payload[PAYLOAD_ARG_CNT]; + u32 out_en = 0; + int ret; + + ret = get_gpio_modepin(ret_payload); + if (ret) + return ret; + + if (value) + out_en = OUTEN(offset) | ret_payload[1]; + else + out_en = ~OUTEN(offset) & ret_payload[1]; + + ret = set_gpio_modepin(out_en); + if (ret) + return ret; + + return modepin_gpio_set_value(dev, offset, value); +} + +static int modepin_gpio_xlate(struct udevice *dev, struct gpio_desc *desc, + struct ofnode_phandle_args *args) +{ + desc->offset = args->args[0]; + + return 0; +} + +static int modepin_gpio_get_value(struct udevice *dev, unsigned int offset) +{ + u32 ret_payload[PAYLOAD_ARG_CNT]; + int ret; + + ret = get_gpio_modepin(ret_payload); + if (ret) + return ret; + + return (INVAL(offset) & ret_payload[1]) ? 1 : 0; +} + +static int modepin_gpio_get_function(struct udevice *dev, unsigned int offset) +{ + u32 ret_payload[PAYLOAD_ARG_CNT]; + int ret; + + ret = get_gpio_modepin(ret_payload); + if (ret) + return ret; + + return (OUTEN(offset) & ret_payload[1]) ? GPIOF_OUTPUT : GPIOF_INPUT; +} + +static const struct dm_gpio_ops modepin_gpio_ops = { + .direction_input = modepin_gpio_direction_input, + .direction_output = modepin_gpio_direction_output, + .get_value = modepin_gpio_get_value, + .set_value = modepin_gpio_set_value, + .get_function = modepin_gpio_get_function, + .xlate = modepin_gpio_xlate, +}; + +static int modepin_gpio_probe(struct udevice *dev) +{ + struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); + const void *label_ptr; + + label_ptr = dev_read_prop(dev, "label", NULL); + if (label_ptr) { + uc_priv->bank_name = strdup(label_ptr); + if (!uc_priv->bank_name) + return -ENOMEM; + } else { + uc_priv->bank_name = dev->name; + } + + uc_priv->gpio_count = 4; + + return 0; +} + +static const struct udevice_id modepin_gpio_ids[] = { + { .compatible = "xlnx,zynqmp-gpio-modepin",}, + { } +}; + +U_BOOT_DRIVER(modepin_gpio) = { + .name = "modepin_gpio", + .id = UCLASS_GPIO, + .ops = &modepin_gpio_ops, + .of_match = modepin_gpio_ids, + .probe = modepin_gpio_probe, +};