1 files changed, 323 insertions, 0 deletions
diff --git a/drivers/st/gpio/stm32_gpio.c b/drivers/st/gpio/stm32_gpio.c
new file mode 100644
index 0000000..a4a64ca
--- /dev/null
+++ b/drivers/st/gpio/stm32_gpio.c
@@ -0,0 +1,323 @@
+/*
+ * Copyright (c) 2016-2022, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <stdbool.h>
+
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <drivers/clk.h>
+#include <drivers/st/stm32_gpio.h>
+#include <drivers/st/stm32mp_clkfunc.h>
+#include <lib/mmio.h>
+#include <lib/utils_def.h>
+#include <libfdt.h>
+
+#include <platform_def.h>
+
+#define DT_GPIO_BANK_SHIFT	12
+#define DT_GPIO_BANK_MASK	GENMASK(16, 12)
+#define DT_GPIO_PIN_SHIFT	8
+#define DT_GPIO_PIN_MASK	GENMASK(11, 8)
+#define DT_GPIO_MODE_MASK	GENMASK(7, 0)
+
+static void set_gpio(uint32_t bank, uint32_t pin, uint32_t mode, uint32_t type,
+		     uint32_t speed, uint32_t pull, uint32_t od,
+		     uint32_t alternate, uint8_t status);
+
+/*******************************************************************************
+ * This function gets GPIO bank node in DT.
+ * Returns node offset if status is okay in DT, else return 0
+ ******************************************************************************/
+static int ckeck_gpio_bank(void *fdt, uint32_t bank, int pinctrl_node)
+{
+	int pinctrl_subnode;
+	uint32_t bank_offset = stm32_get_gpio_bank_offset(bank);
+
+	fdt_for_each_subnode(pinctrl_subnode, fdt, pinctrl_node) {
+		const fdt32_t *cuint;
+
+		if (fdt_getprop(fdt, pinctrl_subnode,
+				"gpio-controller", NULL) == NULL) {
+			continue;
+		}
+
+		cuint = fdt_getprop(fdt, pinctrl_subnode, "reg", NULL);
+		if (cuint == NULL) {
+			continue;
+		}
+
+		if ((fdt32_to_cpu(*cuint) == bank_offset) &&
+		    (fdt_get_status(pinctrl_subnode) != DT_DISABLED)) {
+			return pinctrl_subnode;
+		}
+	}
+
+	return 0;
+}
+
+/*******************************************************************************
+ * This function gets the pin settings from DT information.
+ * When analyze and parsing is done, set the GPIO registers.
+ * Returns 0 on success and a negative FDT error code on failure.
+ ******************************************************************************/
+static int dt_set_gpio_config(void *fdt, int node, uint8_t status)
+{
+	const fdt32_t *cuint, *slewrate;
+	int len;
+	int pinctrl_node;
+	uint32_t i;
+	uint32_t speed = GPIO_SPEED_LOW;
+	uint32_t pull = GPIO_NO_PULL;
+
+	cuint = fdt_getprop(fdt, node, "pinmux", &len);
+	if (cuint == NULL) {
+		return -FDT_ERR_NOTFOUND;
+	}
+
+	pinctrl_node = fdt_parent_offset(fdt, fdt_parent_offset(fdt, node));
+	if (pinctrl_node < 0) {
+		return -FDT_ERR_NOTFOUND;
+	}
+
+	slewrate = fdt_getprop(fdt, node, "slew-rate", NULL);
+	if (slewrate != NULL) {
+		speed = fdt32_to_cpu(*slewrate);
+	}
+
+	if (fdt_getprop(fdt, node, "bias-pull-up", NULL) != NULL) {
+		pull = GPIO_PULL_UP;
+	} else if (fdt_getprop(fdt, node, "bias-pull-down", NULL) != NULL) {
+		pull = GPIO_PULL_DOWN;
+	} else {
+		VERBOSE("No bias configured in node %d\n", node);
+	}
+
+	for (i = 0U; i < ((uint32_t)len / sizeof(uint32_t)); i++) {
+		uint32_t pincfg;
+		uint32_t bank;
+		uint32_t pin;
+		uint32_t mode;
+		uint32_t alternate = GPIO_ALTERNATE_(0);
+		uint32_t type;
+		uint32_t od = GPIO_OD_OUTPUT_LOW;
+		int bank_node;
+		int clk;
+
+		pincfg = fdt32_to_cpu(*cuint);
+		cuint++;
+
+		bank = (pincfg & DT_GPIO_BANK_MASK) >> DT_GPIO_BANK_SHIFT;
+
+		pin = (pincfg & DT_GPIO_PIN_MASK) >> DT_GPIO_PIN_SHIFT;
+
+		mode = pincfg & DT_GPIO_MODE_MASK;
+
+		switch (mode) {
+		case 0:
+			mode = GPIO_MODE_INPUT;
+			break;
+		case 1 ... 16:
+			alternate = mode - 1U;
+			mode = GPIO_MODE_ALTERNATE;
+			break;
+		case 17:
+			mode = GPIO_MODE_ANALOG;
+			break;
+		default:
+			mode = GPIO_MODE_OUTPUT;
+			break;
+		}
+
+		if (fdt_getprop(fdt, node, "drive-open-drain", NULL) != NULL) {
+			type = GPIO_TYPE_OPEN_DRAIN;
+		} else {
+			type = GPIO_TYPE_PUSH_PULL;
+		}
+
+		if (fdt_getprop(fdt, node, "output-high", NULL) != NULL) {
+			if (mode == GPIO_MODE_INPUT) {
+				mode = GPIO_MODE_OUTPUT;
+				od = GPIO_OD_OUTPUT_HIGH;
+			}
+		}
+
+		if (fdt_getprop(fdt, node, "output-low", NULL) != NULL) {
+			if (mode == GPIO_MODE_INPUT) {
+				mode = GPIO_MODE_OUTPUT;
+				od = GPIO_OD_OUTPUT_LOW;
+			}
+		}
+
+		bank_node = ckeck_gpio_bank(fdt, bank, pinctrl_node);
+		if (bank_node == 0) {
+			ERROR("PINCTRL inconsistent in DT\n");
+			panic();
+		}
+
+		clk = fdt_get_clock_id(bank_node);
+		if (clk < 0) {
+			return -FDT_ERR_NOTFOUND;
+		}
+
+		/* Platform knows the clock: assert it is okay */
+		assert((unsigned long)clk == stm32_get_gpio_bank_clock(bank));
+
+		set_gpio(bank, pin, mode, type, speed, pull, od, alternate, status);
+	}
+
+	return 0;
+}
+
+/*******************************************************************************
+ * This function gets the pin settings from DT information.
+ * When analyze and parsing is done, set the GPIO registers.
+ * Returns 0 on success and a negative FDT/ERRNO error code on failure.
+ ******************************************************************************/
+int dt_set_pinctrl_config(int node)
+{
+	const fdt32_t *cuint;
+	int lenp;
+	uint32_t i;
+	uint8_t status;
+	void *fdt;
+
+	if (fdt_get_address(&fdt) == 0) {
+		return -FDT_ERR_NOTFOUND;
+	}
+
+	status = fdt_get_status(node);
+	if (status == DT_DISABLED) {
+		return -FDT_ERR_NOTFOUND;
+	}
+
+	cuint = fdt_getprop(fdt, node, "pinctrl-0", &lenp);
+	if (cuint == NULL) {
+		return -FDT_ERR_NOTFOUND;
+	}
+
+	for (i = 0; i < ((uint32_t)lenp / 4U); i++) {
+		int p_node, p_subnode;
+
+		p_node = fdt_node_offset_by_phandle(fdt, fdt32_to_cpu(*cuint));
+		if (p_node < 0) {
+			return -FDT_ERR_NOTFOUND;
+		}
+
+		fdt_for_each_subnode(p_subnode, fdt, p_node) {
+			int ret = dt_set_gpio_config(fdt, p_subnode, status);
+
+			if (ret < 0) {
+				return ret;
+			}
+		}
+
+		cuint++;
+	}
+
+	return 0;
+}
+
+static void set_gpio(uint32_t bank, uint32_t pin, uint32_t mode, uint32_t type,
+		     uint32_t speed, uint32_t pull, uint32_t od,
+		     uint32_t alternate, uint8_t status)
+{
+	uintptr_t base = stm32_get_gpio_bank_base(bank);
+	unsigned long clock = stm32_get_gpio_bank_clock(bank);
+
+	assert(pin <= GPIO_PIN_MAX);
+
+	clk_enable(clock);
+
+	mmio_clrsetbits_32(base + GPIO_MODE_OFFSET,
+			   (uint32_t)GPIO_MODE_MASK << (pin << 1U),
+			   mode << (pin << 1U));
+
+	mmio_clrsetbits_32(base + GPIO_TYPE_OFFSET,
+			   (uint32_t)GPIO_TYPE_MASK << pin,
+			   type << pin);
+
+	mmio_clrsetbits_32(base + GPIO_SPEED_OFFSET,
+			   (uint32_t)GPIO_SPEED_MASK << (pin << 1U),
+			   speed << (pin << 1U));
+
+	mmio_clrsetbits_32(base + GPIO_PUPD_OFFSET,
+			   (uint32_t)GPIO_PULL_MASK << (pin << 1U),
+			   pull << (pin << 1U));
+
+	if (pin < GPIO_ALT_LOWER_LIMIT) {
+		mmio_clrsetbits_32(base + GPIO_AFRL_OFFSET,
+				   (uint32_t)GPIO_ALTERNATE_MASK << (pin << 2U),
+				   alternate << (pin << 2U));
+	} else {
+		uint32_t shift = (pin - GPIO_ALT_LOWER_LIMIT) << 2U;
+
+		mmio_clrsetbits_32(base + GPIO_AFRH_OFFSET,
+				   (uint32_t)GPIO_ALTERNATE_MASK << shift,
+				   alternate << shift);
+	}
+
+	mmio_clrsetbits_32(base + GPIO_OD_OFFSET,
+			   (uint32_t)GPIO_OD_MASK << pin,
+			   od << pin);
+
+	VERBOSE("GPIO %u mode set to 0x%x\n", bank,
+		mmio_read_32(base + GPIO_MODE_OFFSET));
+	VERBOSE("GPIO %u type set to 0x%x\n", bank,
+		mmio_read_32(base + GPIO_TYPE_OFFSET));
+	VERBOSE("GPIO %u speed set to 0x%x\n", bank,
+		mmio_read_32(base + GPIO_SPEED_OFFSET));
+	VERBOSE("GPIO %u mode pull to 0x%x\n", bank,
+		mmio_read_32(base + GPIO_PUPD_OFFSET));
+	VERBOSE("GPIO %u mode alternate low to 0x%x\n", bank,
+		mmio_read_32(base + GPIO_AFRL_OFFSET));
+	VERBOSE("GPIO %u mode alternate high to 0x%x\n", bank,
+		mmio_read_32(base + GPIO_AFRH_OFFSET));
+	VERBOSE("GPIO %u output data set to 0x%x\n", bank,
+		mmio_read_32(base + GPIO_OD_OFFSET));
+
+	clk_disable(clock);
+
+	if (status == DT_SECURE) {
+		stm32mp_register_secure_gpio(bank, pin);
+#if !IMAGE_BL2
+		set_gpio_secure_cfg(bank, pin, true);
+#endif
+
+	} else {
+		stm32mp_register_non_secure_gpio(bank, pin);
+#if !IMAGE_BL2
+		set_gpio_secure_cfg(bank, pin, false);
+#endif
+	}
+}
+
+void set_gpio_secure_cfg(uint32_t bank, uint32_t pin, bool secure)
+{
+	uintptr_t base = stm32_get_gpio_bank_base(bank);
+	unsigned long clock = stm32_get_gpio_bank_clock(bank);
+
+	assert(pin <= GPIO_PIN_MAX);
+
+	clk_enable(clock);
+
+	if (secure) {
+		mmio_setbits_32(base + GPIO_SECR_OFFSET, BIT(pin));
+	} else {
+		mmio_clrbits_32(base + GPIO_SECR_OFFSET, BIT(pin));
+	}
+
+	clk_disable(clock);
+}
+
+void set_gpio_reset_cfg(uint32_t bank, uint32_t pin)
+{
+	set_gpio(bank, pin, GPIO_MODE_ANALOG, GPIO_TYPE_PUSH_PULL,
+		 GPIO_SPEED_LOW, GPIO_NO_PULL, GPIO_OD_OUTPUT_LOW,
+		 GPIO_ALTERNATE_(0), DT_DISABLED);
+	set_gpio_secure_cfg(bank, pin, stm32_gpio_is_secure_at_reset(bank));
+}