[U-Boot] [PATCH 08/18] dm: gpio: Add driver for stm32f7 gpio controller

Vikas Manocha vikas.manocha at st.com
Mon Mar 20 20:48:34 UTC 2017 

This patch adds gpio driver supporting driver model for stm32f7 gpio.

Signed-off-by: Vikas Manocha <vikas.manocha at st.com>
cc: Christophe KERELLO <christophe.kerello at st.com>
---
 drivers/gpio/Kconfig        |   9 +++
 drivers/gpio/Makefile       |   1 +
 drivers/gpio/stm32f7_gpio.c | 189 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 199 insertions(+)
 create mode 100644 drivers/gpio/stm32f7_gpio.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 8d9ab52..c8af398 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -151,6 +151,15 @@ config PIC32_GPIO
 	help
 	  Say yes here to support Microchip PIC32 GPIOs.
 
+config STM32F7_GPIO
+	bool "ST STM32 GPIO driver"
+	depends on DM_GPIO
+	default y
+	help
+	  Device model driver support for STM32 GPIO controller. It should be
+	  usable on many stm32 families like stm32f4 & stm32H7.
+	  Tested on STM32F7.
+
 config MVEBU_GPIO
 	bool "Marvell MVEBU GPIO driver"
 	depends on DM_GPIO && ARCH_MVEBU
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 8939226..9c2a9cc 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -49,6 +49,7 @@ oby-$(CONFIG_SX151X)		+= sx151x.o
 obj-$(CONFIG_SUNXI_GPIO)	+= sunxi_gpio.o
 obj-$(CONFIG_LPC32XX_GPIO)	+= lpc32xx_gpio.o
 obj-$(CONFIG_STM32_GPIO)	+= stm32_gpio.o
+obj-$(CONFIG_STM32F7_GPIO)	+= stm32f7_gpio.o
 obj-$(CONFIG_GPIO_UNIPHIER)	+= gpio-uniphier.o
 obj-$(CONFIG_ZYNQ_GPIO)		+= zynq_gpio.o
 obj-$(CONFIG_VYBRID_GPIO)	+= vybrid_gpio.o
diff --git a/drivers/gpio/stm32f7_gpio.c b/drivers/gpio/stm32f7_gpio.c
new file mode 100644
index 0000000..369227a
--- /dev/null
+++ b/drivers/gpio/stm32f7_gpio.c
@@ -0,0 +1,189 @@
+/*
+ * (C) Copyright 2017
+ * Vikas Manocha, <vikas.manocha at st.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <linux/io.h>
+#include <linux/errno.h>
+#include <asm/io.h>
+#include <asm/arch/stm32.h>
+#include <asm/arch/gpio.h>
+#include <asm/gpio.h>
+
+#define STM32_GPIOS_PER_BANK		16
+#define MAX_SIZE_BANK_NAME		6
+#define MODE_BITS(gpio_pin)		(gpio_pin * 2)
+#define MODE_BITS_MASK			3
+#define OSPEED_MASK			3
+#define PUPD_MASK			3
+#define OTYPE_MSK			1
+#define AFR_MASK			0xF
+#define IN_OUT_BIT_INDEX(gpio_pin)	(1UL << (gpio_pin))
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct stm32_gpio_regs {
+	u32 moder;	/* GPIO port mode */
+	u32 otyper;	/* GPIO port output type */
+	u32 ospeedr;	/* GPIO port output speed */
+	u32 pupdr;	/* GPIO port pull-up/pull-down */
+	u32 idr;	/* GPIO port input data */
+	u32 odr;	/* GPIO port output data */
+	u32 bsrr;	/* GPIO port bit set/reset */
+	u32 lckr;	/* GPIO port configuration lock */
+	u32 afr[2];	/* GPIO alternate function */
+};
+
+struct stm32_gpio_priv {
+	struct stm32_gpio_regs *regs;
+	char name[MAX_SIZE_BANK_NAME];
+};
+
+#define CHECK_CTL(x)	(!x || x->af > 15 || x->mode > 3 || x->otype > 1 || \
+			x->pupd > 2 || x->speed > 3)
+
+int stm32_gpio_config(struct gpio_desc *desc, const struct stm32_gpio_ctl *ctl)
+{
+	struct stm32_gpio_priv *priv = dev_get_priv(desc->dev);
+	struct stm32_gpio_regs *regs = priv->regs;
+	u32 index;
+
+	if (CHECK_CTL(ctl))
+		return -EINVAL;
+
+	index = (desc->offset & 0x07) * 4;
+	clrsetbits_le32(&regs->afr[desc->offset >> 3], AFR_MASK << index,
+			ctl->af << index);
+
+	index = desc->offset * 2;
+	clrsetbits_le32(&regs->moder, MODE_BITS_MASK << index,
+			ctl->mode << index);
+	clrsetbits_le32(&regs->ospeedr, OSPEED_MASK << index,
+			ctl->speed << index);
+	clrsetbits_le32(&regs->pupdr, PUPD_MASK << index, ctl->pupd << index);
+
+	index = desc->offset;
+	clrsetbits_le32(&regs->otyper, OTYPE_MSK << index, ctl->otype << index);
+
+	return 0;
+}
+
+static int stm32_gpio_direction_input(struct udevice *dev, unsigned offset)
+{
+	struct stm32_gpio_priv *priv = dev_get_priv(dev);
+	struct stm32_gpio_regs *regs = priv->regs;
+	int bits_index = MODE_BITS(offset);
+	int mask = MODE_BITS_MASK << bits_index;
+
+	clrsetbits_le32(&regs->moder, mask, STM32_GPIO_MODE_IN << bits_index);
+
+	return 0;
+}
+
+static int stm32_gpio_direction_output(struct udevice *dev, unsigned offset,
+				       int value)
+{
+	struct stm32_gpio_priv *priv = dev_get_priv(dev);
+	struct stm32_gpio_regs *regs = priv->regs;
+	int bits_index = MODE_BITS(offset);
+	int mask = MODE_BITS_MASK << bits_index;
+
+	clrsetbits_le32(&regs->moder, mask, STM32_GPIO_MODE_OUT << bits_index);
+	mask = IN_OUT_BIT_INDEX(offset);
+	clrsetbits_le32(&regs->odr, mask, value ? mask : 0);
+
+	return 0;
+}
+
+static int stm32_gpio_get_value(struct udevice *dev, unsigned offset)
+{
+	struct stm32_gpio_priv *priv = dev_get_priv(dev);
+	struct stm32_gpio_regs *regs = priv->regs;
+
+	return readl(&regs->idr) & IN_OUT_BIT_INDEX(offset) ? 1 : 0;
+}
+
+static int stm32_gpio_set_value(struct udevice *dev, unsigned offset, int value)
+{
+	struct stm32_gpio_priv *priv = dev_get_priv(dev);
+	struct stm32_gpio_regs *regs = priv->regs;
+	int mask = IN_OUT_BIT_INDEX(offset);
+
+	clrsetbits_le32(&regs->odr, mask, value ? mask : 0);
+
+	return 0;
+}
+
+static const struct dm_gpio_ops gpio_stm32_ops = {
+	.direction_input	= stm32_gpio_direction_input,
+	.direction_output	= stm32_gpio_direction_output,
+	.get_value		= stm32_gpio_get_value,
+	.set_value		= stm32_gpio_set_value,
+};
+
+static int gpio_stm32_probe(struct udevice *dev)
+{
+	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+	struct stm32_gpio_priv *priv = dev_get_priv(dev);
+	fdt_addr_t addr;
+	int ret;
+
+	addr = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
+						dev->parent->of_offset,
+						dev->of_offset, "reg", 0, NULL,
+						true);
+	if (addr == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	priv->regs = (struct stm32_gpio_regs *)addr;
+
+	ret = fdtdec_get_byte_array(gd->fdt_blob, dev->of_offset,
+				    "st,bank-name", (u8 *)priv->name,
+				    sizeof(priv->name) - 1);
+	if (ret)
+		return ret;
+
+	priv->name[MAX_SIZE_BANK_NAME - 1] = '\0';
+	uc_priv->gpio_count = STM32_GPIOS_PER_BANK;
+	uc_priv->bank_name = priv->name;
+	debug("%s, addr = 0x%p, bank_name = %s\n", __func__, (u32 *)priv->regs,
+	      uc_priv->bank_name);
+
+#ifdef CONFIG_CLK
+	struct clk clk;
+	ret = clk_get_by_index(dev, 0, &clk);
+	if (ret < 0)
+		return ret;
+
+	ret = clk_enable(&clk);
+
+	if (ret) {
+		dev_err(dev, "failed to enable clock\n");
+		return ret;
+	}
+	debug("clock enabled for device %s\n", dev->name);
+#endif
+
+	return 0;
+}
+
+static const struct udevice_id stm32_gpio_ids[] = {
+	{ .compatible = "st,stm32-gpio" },
+	{ }
+};
+
+U_BOOT_DRIVER(gpio_stm32) = {
+	.name	= "gpio_stm32",
+	.id	= UCLASS_GPIO,
+	.of_match = stm32_gpio_ids,
+	.probe	= gpio_stm32_probe,
+	.ops	= &gpio_stm32_ops,
+	.flags	= DM_FLAG_PRE_RELOC | DM_UC_FLAG_SEQ_ALIAS,
+	.priv_auto_alloc_size	= sizeof(struct stm32_gpio_priv),
+};
-- 
1.9.1

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