nxp: gpio driver support

NXP General Purpose Input/Output driver support for
NXP platforms.
Signed-off-by: Pankaj Gupta <pankaj.gupta@nxp.com>
Change-Id: I9a3574f1d5d12e4a65ff60f640d4e77e2defd6d4

drivers/nxp/gpio/gpio.mk

+#
+# Copyright 2021 NXP
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+#-----------------------------------------------------------------------------
+
+ifeq (${GPIO_ADDED},)
+
+GPIO_ADDED		:= 1
+
+GPIO_DRIVERS_PATH	:=  drivers/nxp/gpio
+
+PLAT_INCLUDES		+=  -I$(GPIO_DRIVERS_PATH)
+
+GPIO_SOURCES		:= $(GPIO_DRIVERS_PATH)/nxp_gpio.c
+
+ifeq (${BL_COMM_GPIO_NEEDED},yes)
+BL_COMMON_SOURCES	+= ${GPIO_SOURCES}
+else
+ifeq (${BL2_GPIO_NEEDED},yes)
+BL2_SOURCES		+= ${GPIO_SOURCES}
+endif
+ifeq (${BL31_GPIO_NEEDED},yes)
+BL31_SOURCES		+= ${GPIO_SOURCES}
+endif
+endif
+
+endif
+#------------------------------------------------

drivers/nxp/gpio/nxp_gpio.c

+/*
+ * Copyright 2021 NXP
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+
+#include <common/debug.h>
+#include <lib/mmio.h>
+#include <nxp_gpio.h>
+
+static gpio_init_info_t *gpio_init_info;
+
+void gpio_init(gpio_init_info_t *gpio_init_data)
+{
+	gpio_init_info = gpio_init_data;
+}
+
+/* This function set GPIO pin for raising POVDD. */
+int set_gpio_bit(uint32_t *gpio_base_addr,
+		 uint32_t bit_num)
+{
+	uint32_t val = 0U;
+	uint32_t *gpdir = NULL;
+	uint32_t *gpdat = NULL;
+
+	if (gpio_init_info == NULL) {
+		ERROR("GPIO is not initialized.\n");
+		return GPIO_FAILURE;
+	}
+
+	gpdir = gpio_base_addr + GPDIR_REG_OFFSET;
+	gpdat = gpio_base_addr + (GPDAT_REG_OFFSET >> 2);
+
+	/*
+	 * Set the corresponding bit in direction register
+	 * to configure the GPIO as output.
+	 */
+	val = gpio_read32(gpdir);
+	val = val | bit_num;
+	gpio_write32(gpdir, val);
+
+	/* Set the corresponding bit in GPIO data register */
+	val = gpio_read32(gpdat);
+	val = val | bit_num;
+	gpio_write32(gpdat, val);
+
+	val = gpio_read32(gpdat);
+
+	if ((val & bit_num) == 0U) {
+		return GPIO_FAILURE;
+	}
+
+	return GPIO_SUCCESS;
+}
+
+/* This function reset GPIO pin set for raising POVDD. */
+int clr_gpio_bit(uint32_t *gpio_base_addr, uint32_t bit_num)
+{
+	uint32_t val = 0U;
+	uint32_t *gpdir = NULL;
+	uint32_t *gpdat = NULL;
+
+
+	if (gpio_init_info == NULL) {
+		ERROR("GPIO is not initialized.\n");
+		return GPIO_FAILURE;
+	}
+
+	gpdir = gpio_base_addr + GPDIR_REG_OFFSET;
+	gpdat = gpio_base_addr + GPDAT_REG_OFFSET;
+
+	/*
+	 * Reset the corresponding bit in direction and data register
+	 * to configure the GPIO as input.
+	 */
+	val = gpio_read32(gpdat);
+	val = val & ~(bit_num);
+	gpio_write32(gpdat, val);
+
+	val = gpio_read32(gpdat);
+
+	val = gpio_read32(gpdir);
+	val = val & ~(bit_num);
+	gpio_write32(gpdir, val);
+
+	val = gpio_read32(gpdat);
+
+	if ((val & bit_num) != 0U) {
+		return GPIO_FAILURE;
+	}
+
+	return GPIO_SUCCESS;
+}
+
+uint32_t *select_gpio_n_bitnum(uint32_t povdd_gpio, uint32_t *bit_num)
+{
+	uint32_t *ret_gpio;
+	uint32_t povdd_gpio_val = 0U;
+	uint32_t gpio_num = 0U;
+
+	if (gpio_init_info == NULL) {
+		ERROR("GPIO is not initialized.\n");
+	}
+	/*
+	 * Subtract 1 from fuse_hdr povdd_gpio value as
+	 * for 0x1 value, bit 0 is to be set
+	 * for 0x20 value i.e 32, bit 31 i.e. 0x1f is to be set.
+	 * 0x1f - 0x00 : GPIO_1
+	 * 0x3f - 0x20 : GPIO_2
+	 * 0x5f - 0x40 : GPIO_3
+	 * 0x7f - 0x60 : GPIO_4
+	 */
+	povdd_gpio_val = (povdd_gpio - 1U) & GPIO_SEL_MASK;
+
+	/* Right shift by 5 to divide by 32 */
+	gpio_num = povdd_gpio_val >> GPIO_ID_BASE_ADDR_SHIFT;
+	*bit_num = 1U << (GPIO_BITS_PER_BASE_REG
+			  - (povdd_gpio_val & GPIO_BIT_MASK)
+			  - 1U);
+
+	switch (gpio_num) {
+	case GPIO_0:
+		ret_gpio = (uint32_t *) gpio_init_info->gpio1_base_addr;
+		break;
+	case GPIO_1:
+		ret_gpio = (uint32_t *) gpio_init_info->gpio2_base_addr;
+		break;
+	case GPIO_2:
+		ret_gpio = (uint32_t *) gpio_init_info->gpio3_base_addr;
+		break;
+	case GPIO_3:
+		ret_gpio = (uint32_t *) gpio_init_info->gpio4_base_addr;
+		break;
+	default:
+		ret_gpio = NULL;
+	}
+
+	if (ret_gpio == NULL) {
+		INFO("GPIO_NUM = %d doesn't exist.\n", gpio_num);
+	}
+
+	return ret_gpio;
+}

drivers/nxp/gpio/nxp_gpio.h

+/*
+ * Copyright 2021 NXP
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+
+#ifndef PLAT_GPIO_H
+#define PLAT_GPIO_H
+
+#include <endian.h>
+#include <lib/mmio.h>
+
+/* GPIO Register offset */
+#define GPIO_SEL_MASK		0x7F
+#define GPIO_BIT_MASK		0x1F
+#define GPDIR_REG_OFFSET	0x0
+#define GPDAT_REG_OFFSET	0x8
+
+#define GPIO_ID_BASE_ADDR_SHIFT 5U
+#define GPIO_BITS_PER_BASE_REG	32U
+
+#define GPIO_0			0
+#define GPIO_1			1
+#define GPIO_2			2
+#define GPIO_3			3
+
+#define GPIO_SUCCESS		0x0
+#define GPIO_FAILURE		0x1
+
+#ifdef NXP_GPIO_BE
+#define gpio_read32(a)           bswap32(mmio_read_32((uintptr_t)(a)))
+#define gpio_write32(a, v)       mmio_write_32((uintptr_t)(a), bswap32(v))
+#elif defined(NXP_GPIO_LE)
+#define gpio_read32(a)           mmio_read_32((uintptr_t)(a))
+#define gpio_write32(a, v)       mmio_write_32((uintptr_t)(a), (v))
+#else
+#error Please define GPIO register endianness
+#endif
+
+typedef struct {
+	uintptr_t gpio1_base_addr;
+	uintptr_t gpio2_base_addr;
+	uintptr_t gpio3_base_addr;
+	uintptr_t gpio4_base_addr;
+} gpio_init_info_t;
+
+void gpio_init(gpio_init_info_t *gpio_init_data);
+uint32_t *select_gpio_n_bitnum(uint32_t povdd_gpio, uint32_t *bit_num);
+int clr_gpio_bit(uint32_t *gpio_base_addr, uint32_t bit_num);
+int set_gpio_bit(uint32_t *gpio_base_addr, uint32_t bit_num);
+
+#endif /* PLAT_GPIO_H */