[U-Boot] [PATCH] dm: gpio: Add DM compatibilty to GPIO driver for Davinci

12 Sep 2017

This adds DM compatibility for the davinici GPIO driver.
Tested on da850-evm.
Signed-off-by: Adam Ford aford173@gmail.com

diff --git a/arch/arm/mach-davinci/include/mach/gpio.h b/arch/arm/mach-davinci/include/mach/gpio.h
index 7da0060..32cae3a 100644
--- a/arch/arm/mach-davinci/include/mach/gpio.h
+++ b/arch/arm/mach-davinci/include/mach/gpio.h
@@ -40,7 +40,7 @@ struct davinci_gpio_bank {
    unsigned int irq_num;
    unsigned int irq_mask;
    unsigned long *in_use;
-	unsigned long base;
+	struct davinci_gpio *base;
 };
#define davinci_gpio_bank01 ((struct davinci_gpio *)DAVINCI_GPIO_BANK01)
@@ -49,7 +49,9 @@ struct davinci_gpio_bank {
 #define davinci_gpio_bank67 ((struct davinci_gpio *)DAVINCI_GPIO_BANK67)
 #define davinci_gpio_bank8 ((struct davinci_gpio *)DAVINCI_GPIO_BANK8)
+#ifndef CONFIG_DM_GPIO
 #define gpio_status()		gpio_info()
+#endif
 #define GPIO_NAME_SIZE		20
 #if defined(CONFIG_SOC_DM644X)
 /* GPIO0 to GPIO53, omit the V3.3 volts one */
@@ -64,4 +66,14 @@ struct davinci_gpio_bank {
void gpio_info(void);
+#ifdef CONFIG_DM_GPIO
+
+/* Information about a GPIO bank */
+struct davinci_gpio_platdata {
+	int bank_index;
+	ulong base;	/* address of registers in physical memory */
+	const char *port_name;
+};
+#endif
+
 #endif
diff --git a/board/davinci/da8xxevm/da850evm.c b/board/davinci/da8xxevm/da850evm.c
index 42bc0f4..2a54d0f 100644
--- a/board/davinci/da8xxevm/da850evm.c
+++ b/board/davinci/da8xxevm/da850evm.c
@@ -10,6 +10,7 @@
  */
#include <common.h>
+#include <dm.h>
 #include <i2c.h>
 #include <net.h>
 #include <netdev.h>
@@ -24,6 +25,7 @@
 #include <linux/errno.h>
 #include <hwconfig.h>
 #include <asm/mach-types.h>
+#include <asm/gpio.h>
#ifdef CONFIG_MMC_DAVINCI
 #include <mmc.h>
diff --git a/configs/da850evm_defconfig b/configs/da850evm_defconfig
index b966fa7..24507da 100644
--- a/configs/da850evm_defconfig
+++ b/configs/da850evm_defconfig
@@ -20,14 +20,15 @@ CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="U-Boot > "
 # CONFIG_CMD_IMLS is not set
 CONFIG_CRC32_VERIFY=y
+# CONFIG_CMD_EEPROM is not set
 # CONFIG_CMD_FLASH is not set
-# CONFIG_CMD_GPIO is not set
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_MTDPARTS=y
 CONFIG_CMD_DIAG=y
 CONFIG_OF_CONTROL=y
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_DM=y
+CONFIG_DM_GPIO=y
 CONFIG_DM_I2C=y
 CONFIG_DM_I2C_COMPAT=y
 CONFIG_I2C_SET_DEFAULT_BUS_NUM=y
diff --git a/drivers/gpio/da8xx_gpio.c b/drivers/gpio/da8xx_gpio.c
index fa3a394..0a8b5a4 100644
--- a/drivers/gpio/da8xx_gpio.c
+++ b/drivers/gpio/da8xx_gpio.c
@@ -8,16 +8,20 @@
  */
#include <common.h>
+#include <dm.h>
+#include <fdtdec.h>
 #include <asm/io.h>
 #include <asm/gpio.h>
 #include <asm/arch/hardware.h>
 #include <asm/arch/davinci_misc.h>
+#ifndef CONFIG_DM_GPIO
 static struct gpio_registry {
    int is_registered;
    char name[GPIO_NAME_SIZE];
 } gpio_registry[MAX_NUM_GPIOS];
+
 #if defined(CONFIG_SOC_DA8XX)
 #define pinmux(x)       (&davinci_syscfg_regs->pinmux[x])
@@ -334,42 +338,30 @@ int gpio_free(unsigned gpio)
    /* Do not configure as input or change pin mux here */
    return 0;
 }
+#endif
-int gpio_direction_input(unsigned gpio)
+static int _gpio_direction_output(struct davinci_gpio *bank, unsigned gpio, int value)
 {
-	struct davinci_gpio *bank;
-
-	bank = GPIO_BANK(gpio);
-	setbits_le32(&bank->dir, 1U << GPIO_BIT(gpio));
+	clrbits_le32(&bank->dir, 1U << GPIO_BIT(gpio));
+	gpio_set_value(gpio, value);
    return 0;
 }
-int gpio_direction_output(unsigned gpio, int value)
+static int _gpio_direction_input(struct davinci_gpio *bank, unsigned gpio)
 {
-	struct davinci_gpio *bank;
-
-	bank = GPIO_BANK(gpio);
-	clrbits_le32(&bank->dir, 1U << GPIO_BIT(gpio));
-	gpio_set_value(gpio, value);
+	setbits_le32(&bank->dir, 1U << GPIO_BIT(gpio));
    return 0;
 }
-int gpio_get_value(unsigned gpio)
+static int _gpio_get_value(struct davinci_gpio *bank, unsigned gpio)
 {
-	struct davinci_gpio *bank;
    unsigned int ip;
-
-	bank = GPIO_BANK(gpio);
    ip = in_le32(&bank->in_data) & (1U << GPIO_BIT(gpio));
    return ip ? 1 : 0;
 }
-int gpio_set_value(unsigned gpio, int value)
+static int _gpio_set_value(struct davinci_gpio *bank, unsigned gpio, int value)
 {
-	struct davinci_gpio *bank;
-
-	bank = GPIO_BANK(gpio);
-
    if (value)
    	bank->set_data = 1U << GPIO_BIT(gpio);
    else
@@ -378,6 +370,13 @@ int gpio_set_value(unsigned gpio, int value)
    return 0;
 }
+static int _gpio_get_dir(struct davinci_gpio *bank, unsigned gpio)
+{
+	return in_le32(&bank->dir) & (1U << GPIO_BIT(gpio));
+}
+
+#ifndef CONFIG_DM_GPIO
+
 void gpio_info(void)
 {
    unsigned gpio, dir, val;
@@ -385,7 +384,8 @@ void gpio_info(void)
for (gpio = 0; gpio < MAX_NUM_GPIOS; ++gpio) {
    	bank = GPIO_BANK(gpio);
-		dir = in_le32(&bank->dir) & (1U << GPIO_BIT(gpio));
+		printf("gpio_info: Bank=%x\n", (int) bank);
+		dir = _gpio_get_dir(bank, gpio);
    	val = gpio_get_value(gpio);
printf("% 4d: %s: %d [%c] %s\n",
@@ -394,3 +394,171 @@ void gpio_info(void)
    		gpio_registry[gpio].name);
    }
 }
+
+
+
+int gpio_direction_input(unsigned gpio)
+{
+	struct davinci_gpio *bank;
+
+	bank = GPIO_BANK(gpio);
+	return _gpio_direction_input(bank, gpio);
+}
+
+int gpio_direction_output(unsigned gpio, int value)
+{
+	struct davinci_gpio *bank;
+
+	bank = GPIO_BANK(gpio);
+	return _gpio_direction_output(bank, gpio, value);
+}
+
+int gpio_get_value(unsigned gpio)
+{
+	struct davinci_gpio *bank;
+
+	bank = GPIO_BANK(gpio);
+	return _gpio_get_value(bank, gpio);
+}
+
+int gpio_set_value(unsigned gpio, int value)
+{
+	struct davinci_gpio *bank;
+
+	bank = GPIO_BANK(gpio);
+	return _gpio_set_value(bank, gpio, value);
+}
+
+
+#else /* CONFIG_DM_GPIO */
+/* set GPIO pin 'gpio' as an input */
+
+static struct davinci_gpio *davinci_get_gpio_bank(struct udevice *dev, unsigned offset)
+{
+	struct davinci_gpio_bank *bank = dev_get_priv(dev);
+
+	/* The device tree is not broken into banks but the infrastructure is
+	 * expecting it this way, so we'll first include the 0x10 offset, then
+	 * calculate the bank manually based on the offset.
+	 */
+
+	return ((struct davinci_gpio *)bank->base) + 0x10 + (offset >> 5);
+}
+
+static int davinci_gpio_direction_input(struct udevice *dev, unsigned offset)
+{
+	struct davinci_gpio *base = davinci_get_gpio_bank(dev, offset);
+
+	_gpio_direction_input(base, offset);
+	return 0;
+}
+
+/* set GPIO pin 'gpio' as an output, with polarity 'value' */
+static int davinci_gpio_direction_output(struct udevice *dev, unsigned offset,
+				       int value)
+{
+	struct davinci_gpio *base = davinci_get_gpio_bank(dev, offset);
+
+	_gpio_direction_output(base, offset, value);
+	return 0;
+}
+
+/* read GPIO IN value of pin 'gpio' */
+static int davinci_gpio_get_value(struct udevice *dev, unsigned offset)
+{
+	struct davinci_gpio *base = davinci_get_gpio_bank(dev, offset);
+
+	return _gpio_get_value(base, offset);
+}
+
+/* write GPIO OUT value to pin 'gpio' */
+static int davinci_gpio_set_value(struct udevice *dev, unsigned offset,
+				 int value)
+{
+	struct davinci_gpio *base = davinci_get_gpio_bank(dev, offset);
+
+	_gpio_set_value(base, offset, value);
+
+	return 0;
+}
+
+static int davinci_gpio_get_function(struct udevice *dev, unsigned offset)
+{
+	unsigned int dir;
+	struct davinci_gpio *base = davinci_get_gpio_bank(dev, offset);
+
+	dir = _gpio_get_dir(base, offset);
+
+	if (dir)
+		return GPIOF_INPUT;
+
+	return GPIOF_OUTPUT;
+}
+
+static const struct dm_gpio_ops gpio_davinci_ops = {
+	.direction_input	= davinci_gpio_direction_input,
+	.direction_output	= davinci_gpio_direction_output,
+	.get_value		= davinci_gpio_get_value,
+	.set_value		= davinci_gpio_set_value,
+	.get_function		= davinci_gpio_get_function,
+};
+
+static int davinci_gpio_probe(struct udevice *dev)
+{
+	struct davinci_gpio_bank *bank = dev_get_priv(dev);
+	struct davinci_gpio_platdata *plat = dev_get_platdata(dev);
+	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+	const void *fdt = gd->fdt_blob;
+	int node = dev_of_offset(dev);
+
+	uc_priv->bank_name = plat->port_name;
+	uc_priv->gpio_count = fdtdec_get_int(fdt, node, "ti,ngpio", -1);
+	bank->base = (struct davinci_gpio *)plat->base;
+	return 0;
+}
+
+static int davinci_gpio_bind(struct udevice *dev)
+{
+	struct davinci_gpio_platdata *plat = dev->platdata;
+	fdt_addr_t base_addr;
+
+	if (plat)
+		return 0;
+
+	base_addr = devfdt_get_addr(dev);
+	if (base_addr == FDT_ADDR_T_NONE)
+		return -ENODEV;
+
+	/*
+	* TODO:
+	* When every board is converted to driver model and DT is
+	* supported, this can be done by auto-alloc feature, but
+	* not using calloc to alloc memory for platdata.
+	*/
+	plat = calloc(1, sizeof(*plat));
+	if (!plat)
+		return -ENOMEM;
+
+	plat->base = base_addr;
+	plat->port_name = fdt_get_name(gd->fdt_blob, dev_of_offset(dev), NULL);
+	dev->platdata = plat;
+
+	return 0;
+}
+
+static const struct udevice_id davinci_gpio_ids[] = {
+	{ .compatible = "ti,dm6441-gpio" },
+	{ }
+};
+
+U_BOOT_DRIVER(gpio_davinci) = {
+	.name	= "gpio_davinci",
+	.id	= UCLASS_GPIO,
+	.ops	= &gpio_davinci_ops,
+	.of_match = davinci_gpio_ids,
+	.bind	= davinci_gpio_bind,
+	.probe	= davinci_gpio_probe,
+	.priv_auto_alloc_size = sizeof(struct davinci_gpio_bank),
+};
+
+#endif
diff --git a/include/configs/da850evm.h b/include/configs/da850evm.h
index ab2e6ae..ea8c441 100644
--- a/include/configs/da850evm.h
+++ b/include/configs/da850evm.h
@@ -262,6 +262,7 @@
 #define CONFIG_ENV_SECT_SIZE		(64 << 10)
 #endif
+#define CONFIG_DA8XX_GPIO
 /*
  * U-Boot general configuration
  */
-- 
2.7.4


    

Adam Ford

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