[U-Boot] [PATCH v4 08/18] dm: gpio: Add driver for stm32f7 gpio controller
Vikas Manocha
vikas.manocha at st.com
Mon Apr 10 22:02:57 UTC 2017
This patch adds gpio driver supporting driver model for stm32f7 gpio.
Signed-off-by: Vikas Manocha <vikas.manocha at st.com>
Reviewed-by: Simon Glass <sjg at chromium.org>
cc: Christophe KERELLO <christophe.kerello at st.com>
---
Changed in v4:
- rebased to master.
Changed in v3:
- made stm32_gpio_config() static.
- moved common.h inclusion before clk.h
Changes in v2:
- included files in correct order.
- moved the pinctrl specific routine from gpio driver to pinctrl
- used dev_get_addr() instead of fdtdec_get_addr_size_auto_parent() in
gpio driver.
- pointed gpio name to bank name in device tree blob rather than copy.
arch/arm/include/asm/arch-stm32f7/gpio.h | 20 ++++-
drivers/gpio/Kconfig | 9 +++
drivers/gpio/Makefile | 1 +
drivers/gpio/stm32f7_gpio.c | 135 +++++++++++++++++++++++++++++++
drivers/pinctrl/pinctrl_stm32.c | 38 ++++++++-
5 files changed, 198 insertions(+), 5 deletions(-)
create mode 100644 drivers/gpio/stm32f7_gpio.c
diff --git a/arch/arm/include/asm/arch-stm32f7/gpio.h b/arch/arm/include/asm/arch-stm32f7/gpio.h
index 2942cd9..45999b4 100644
--- a/arch/arm/include/asm/arch-stm32f7/gpio.h
+++ b/arch/arm/include/asm/arch-stm32f7/gpio.h
@@ -96,6 +96,22 @@ struct stm32_gpio_ctl {
enum stm32_gpio_af af;
};
+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;
+};
+
static inline unsigned stm32_gpio_to_port(unsigned gpio)
{
return gpio / 16;
@@ -106,8 +122,4 @@ static inline unsigned stm32_gpio_to_pin(unsigned gpio)
return gpio % 16;
}
-int stm32_gpio_config(const struct stm32_gpio_dsc *gpio_dsc,
- const struct stm32_gpio_ctl *gpio_ctl);
-int stm32_gpout_set(const struct stm32_gpio_dsc *gpio_dsc, int state);
-
#endif /* _STM32_GPIO_H_ */
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index dc4108f..7c28e26 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -158,6 +158,15 @@ 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 27f8068..0ca845f 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..5e05463
--- /dev/null
+++ b/drivers/gpio/stm32f7_gpio.c
@@ -0,0 +1,135 @@
+/*
+ * (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 <asm/arch/gpio.h>
+#include <asm/arch/stm32.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+
+#define MAX_SIZE_BANK_NAME 5
+#define STM32_GPIOS_PER_BANK 16
+#define MODE_BITS(gpio_pin) (gpio_pin * 2)
+#define MODE_BITS_MASK 3
+#define IN_OUT_BIT_INDEX(gpio_pin) (1UL << (gpio_pin))
+
+DECLARE_GLOBAL_DATA_PTR;
+
+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(®s->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(®s->moder, mask, STM32_GPIO_MODE_OUT << bits_index);
+ mask = IN_OUT_BIT_INDEX(offset);
+ clrsetbits_le32(®s->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(®s->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(®s->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;
+ char *name;
+
+ addr = dev_get_addr(dev);
+ if (addr == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ priv->regs = (struct stm32_gpio_regs *)addr;
+ name = (char *)fdtdec_locate_byte_array(gd->fdt_blob,
+ dev_of_offset(dev),
+ "st,bank-name",
+ MAX_SIZE_BANK_NAME);
+ if (!name)
+ return -EINVAL;
+ uc_priv->bank_name = name;
+ uc_priv->gpio_count = STM32_GPIOS_PER_BANK;
+ debug("%s, addr = 0x%p, bank_name = %s\n", __func__, (u32 *)priv->regs,
+ uc_priv->bank_name);
+
+#ifdef CONFIG_CLK
+ struct clk clk;
+ int ret;
+ 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),
+};
diff --git a/drivers/pinctrl/pinctrl_stm32.c b/drivers/pinctrl/pinctrl_stm32.c
index aa2c440..0e74d05 100644
--- a/drivers/pinctrl/pinctrl_stm32.c
+++ b/drivers/pinctrl/pinctrl_stm32.c
@@ -1,10 +1,45 @@
#include <common.h>
-#include <asm/arch/gpio.h>
#include <dm.h>
#include <dm/pinctrl.h>
+#include <asm/arch/gpio.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
DECLARE_GLOBAL_DATA_PTR;
+#define MODE_BITS_MASK 3
+#define OSPEED_MASK 3
+#define PUPD_MASK 3
+#define OTYPE_MSK 1
+#define AFR_MASK 0xF
+
+static 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 (!ctl || ctl->af > 15 || ctl->mode > 3 || ctl->otype > 1 ||
+ ctl->pupd > 2 || ctl->speed > 3)
+ return -EINVAL;
+
+ index = (desc->offset & 0x07) * 4;
+ clrsetbits_le32(®s->afr[desc->offset >> 3], AFR_MASK << index,
+ ctl->af << index);
+
+ index = desc->offset * 2;
+ clrsetbits_le32(®s->moder, MODE_BITS_MASK << index,
+ ctl->mode << index);
+ clrsetbits_le32(®s->ospeedr, OSPEED_MASK << index,
+ ctl->speed << index);
+ clrsetbits_le32(®s->pupdr, PUPD_MASK << index, ctl->pupd << index);
+
+ index = desc->offset;
+ clrsetbits_le32(®s->otyper, OTYPE_MSK << index, ctl->otype << index);
+
+ return 0;
+}
static int prep_gpio_dsc(struct stm32_gpio_dsc *gpio_dsc, u32 port_pin)
{
gpio_dsc->port = (port_pin & 0xF000) >> 12;
@@ -18,6 +53,7 @@ static int prep_gpio_dsc(struct stm32_gpio_dsc *gpio_dsc, u32 port_pin)
static int prep_gpio_ctl(struct stm32_gpio_ctl *gpio_ctl, u32 gpio_fn, int node)
{
gpio_fn &= 0x00FF;
+ gpio_ctl->af = 0;
switch (gpio_fn) {
case 0:
--
1.9.1
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