dm: imx: gpio: Support driver model in MXC gpio driver

Add driver model support with this driver. In this case the platform data
is in the driver. It would be better to put this into an SOC-specific file,
but this is best attempted when more boards are moved over to use driver
model.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>

1 files changed, 303 insertions, 1 deletions

diff --git a/drivers/gpio/mxc_gpio.c b/drivers/gpio/mxc_gpio.c
index 6a572d5..3f7b7d2 100644
--- a/drivers/gpio/mxc_gpio.c
+++ b/drivers/gpio/mxc_gpio.c
@@ -8,16 +8,31 @@
  * SPDX-License-Identifier:	GPL-2.0+
  */
 #include <common.h>
+#include <errno.h>
+#include <dm.h>
+#include <malloc.h>
 #include <asm/arch/imx-regs.h>
 #include <asm/gpio.h>
 #include <asm/io.h>
-#include <errno.h>
 
 enum mxc_gpio_direction {
 	MXC_GPIO_DIRECTION_IN,
 	MXC_GPIO_DIRECTION_OUT,
 };
 
+#define GPIO_NAME_SIZE			20
+#define GPIO_PER_BANK			32
+
+struct mxc_gpio_plat {
+	struct gpio_regs *regs;
+};
+
+struct mxc_bank_info {
+	char label[GPIO_PER_BANK][GPIO_NAME_SIZE];
+	struct gpio_regs *regs;
+};
+
+#ifndef CONFIG_DM_GPIO
 #define GPIO_TO_PORT(n)		(n / 32)
 
 /* GPIO port description */
@@ -134,3 +149,290 @@ int gpio_direction_output(unsigned gpio, int value)
 
 	return mxc_gpio_direction(gpio, MXC_GPIO_DIRECTION_OUT);
 }
+#endif
+
+#ifdef CONFIG_DM_GPIO
+/**
+ * gpio_is_requested() - check if a GPIO has been requested
+ *
+ * @bank:	Bank to check
+ * @offset:	GPIO offset within bank to check
+ * @return true if marked as requested, false if not
+ */
+static inline bool gpio_is_requested(struct mxc_bank_info *bank, int offset)
+{
+	return *bank->label[offset] != '\0';
+}
+
+static int mxc_gpio_is_output(struct gpio_regs *regs, int offset)
+{
+	u32 val;
+
+	val = readl(&regs->gpio_dir);
+
+	return val & (1 << offset) ? 1 : 0;
+}
+
+static void mxc_gpio_bank_direction(struct gpio_regs *regs, int offset,
+				    enum mxc_gpio_direction direction)
+{
+	u32 l;
+
+	l = readl(&regs->gpio_dir);
+
+	switch (direction) {
+	case MXC_GPIO_DIRECTION_OUT:
+		l |= 1 << offset;
+		break;
+	case MXC_GPIO_DIRECTION_IN:
+		l &= ~(1 << offset);
+	}
+	writel(l, &regs->gpio_dir);
+}
+
+static void mxc_gpio_bank_set_value(struct gpio_regs *regs, int offset,
+				    int value)
+{
+	u32 l;
+
+	l = readl(&regs->gpio_dr);
+	if (value)
+		l |= 1 << offset;
+	else
+		l &= ~(1 << offset);
+	writel(l, &regs->gpio_dr);
+}
+
+static int mxc_gpio_bank_get_value(struct gpio_regs *regs, int offset)
+{
+	return (readl(&regs->gpio_psr) >> offset) & 0x01;
+}
+
+static int mxc_gpio_bank_get_output_value(struct gpio_regs *regs, int offset)
+{
+	return (readl(&regs->gpio_dr) >> offset) & 0x01;
+}
+
+static int check_requested(struct udevice *dev, unsigned offset,
+			   const char *func)
+{
+	struct mxc_bank_info *bank = dev_get_priv(dev);
+	struct gpio_dev_priv *uc_priv = dev->uclass_priv;
+
+	if (!gpio_is_requested(bank, offset)) {
+		printf("mxc_gpio: %s: error: gpio %s%d not requested\n",
+		       func, uc_priv->bank_name, offset);
+		return -EPERM;
+	}
+
+	return 0;
+}
+
+/* set GPIO pin 'gpio' as an input */
+static int mxc_gpio_direction_input(struct udevice *dev, unsigned offset)
+{
+	struct mxc_bank_info *bank = dev_get_priv(dev);
+	int ret;
+
+	ret = check_requested(dev, offset, __func__);
+	if (ret)
+		return ret;
+
+	/* Configure GPIO direction as input. */
+	mxc_gpio_bank_direction(bank->regs, offset, MXC_GPIO_DIRECTION_IN);
+
+	return 0;
+}
+
+/* set GPIO pin 'gpio' as an output, with polarity 'value' */
+static int mxc_gpio_direction_output(struct udevice *dev, unsigned offset,
+				       int value)
+{
+	struct mxc_bank_info *bank = dev_get_priv(dev);
+	int ret;
+
+	ret = check_requested(dev, offset, __func__);
+	if (ret)
+		return ret;
+
+	/* Configure GPIO output value. */
+	mxc_gpio_bank_set_value(bank->regs, offset, value);
+
+	/* Configure GPIO direction as output. */
+	mxc_gpio_bank_direction(bank->regs, offset, MXC_GPIO_DIRECTION_OUT);
+
+	return 0;
+}
+
+/* read GPIO IN value of pin 'gpio' */
+static int mxc_gpio_get_value(struct udevice *dev, unsigned offset)
+{
+	struct mxc_bank_info *bank = dev_get_priv(dev);
+	int ret;
+
+	ret = check_requested(dev, offset, __func__);
+	if (ret)
+		return ret;
+
+	return mxc_gpio_bank_get_value(bank->regs, offset);
+}
+
+/* write GPIO OUT value to pin 'gpio' */
+static int mxc_gpio_set_value(struct udevice *dev, unsigned offset,
+				 int value)
+{
+	struct mxc_bank_info *bank = dev_get_priv(dev);
+	int ret;
+
+	ret = check_requested(dev, offset, __func__);
+	if (ret)
+		return ret;
+
+	mxc_gpio_bank_set_value(bank->regs, offset, value);
+
+	return 0;
+}
+
+static int mxc_gpio_get_state(struct udevice *dev, unsigned int offset,
+			      char *buf, int bufsize)
+{
+	struct gpio_dev_priv *uc_priv = dev->uclass_priv;
+	struct mxc_bank_info *bank = dev_get_priv(dev);
+	const char *label;
+	bool requested;
+	bool is_output;
+	int size;
+
+	label = bank->label[offset];
+	is_output = mxc_gpio_is_output(bank->regs, offset);
+	size = snprintf(buf, bufsize, "%s%d: ",
+			uc_priv->bank_name ? uc_priv->bank_name : "", offset);
+	buf += size;
+	bufsize -= size;
+	requested = gpio_is_requested(bank, offset);
+	snprintf(buf, bufsize, "%s: %d [%c]%s%s",
+		 is_output ? "out" : " in",
+		 is_output ?
+			mxc_gpio_bank_get_output_value(bank->regs, offset) :
+			mxc_gpio_bank_get_value(bank->regs, offset),
+		 requested ? 'x' : ' ',
+		 requested ? " " : "",
+		 label);
+
+	return 0;
+}
+
+static int mxc_gpio_request(struct udevice *dev, unsigned offset,
+			      const char *label)
+{
+	struct mxc_bank_info *bank = dev_get_priv(dev);
+
+	if (gpio_is_requested(bank, offset))
+		return -EBUSY;
+
+	strncpy(bank->label[offset], label, GPIO_NAME_SIZE);
+	bank->label[offset][GPIO_NAME_SIZE - 1] = '\0';
+
+	return 0;
+}
+
+static int mxc_gpio_free(struct udevice *dev, unsigned offset)
+{
+	struct mxc_bank_info *bank = dev_get_priv(dev);
+	int ret;
+
+	ret = check_requested(dev, offset, __func__);
+	if (ret)
+		return ret;
+	bank->label[offset][0] = '\0';
+
+	return 0;
+}
+
+static int mxc_gpio_get_function(struct udevice *dev, unsigned offset)
+{
+	struct mxc_bank_info *bank = dev_get_priv(dev);
+
+	if (!gpio_is_requested(bank, offset))
+		return GPIOF_UNUSED;
+
+	/* GPIOF_FUNC is not implemented yet */
+	if (mxc_gpio_is_output(bank->regs, offset))
+		return GPIOF_OUTPUT;
+	else
+		return GPIOF_INPUT;
+}
+
+static const struct dm_gpio_ops gpio_mxc_ops = {
+	.request		= mxc_gpio_request,
+	.free			= mxc_gpio_free,
+	.direction_input	= mxc_gpio_direction_input,
+	.direction_output	= mxc_gpio_direction_output,
+	.get_value		= mxc_gpio_get_value,
+	.set_value		= mxc_gpio_set_value,
+	.get_function		= mxc_gpio_get_function,
+	.get_state		= mxc_gpio_get_state,
+};
+
+static const struct mxc_gpio_plat mxc_plat[] = {
+	{ (struct gpio_regs *)GPIO1_BASE_ADDR },
+	{ (struct gpio_regs *)GPIO2_BASE_ADDR },
+	{ (struct gpio_regs *)GPIO3_BASE_ADDR },
+#if defined(CONFIG_MX25) || defined(CONFIG_MX27) || defined(CONFIG_MX51) || \
+		defined(CONFIG_MX53) || defined(CONFIG_MX6)
+	{ (struct gpio_regs *)GPIO4_BASE_ADDR },
+#endif
+#if defined(CONFIG_MX27) || defined(CONFIG_MX53) || defined(CONFIG_MX6)
+	{ (struct gpio_regs *)GPIO5_BASE_ADDR },
+	{ (struct gpio_regs *)GPIO6_BASE_ADDR },
+#endif
+#if defined(CONFIG_MX53) || defined(CONFIG_MX6)
+	{ (struct gpio_regs *)GPIO7_BASE_ADDR },
+#endif
+};
+
+static int mxc_gpio_probe(struct udevice *dev)
+{
+	struct mxc_bank_info *bank = dev_get_priv(dev);
+	struct mxc_gpio_plat *plat = dev_get_platdata(dev);
+	struct gpio_dev_priv *uc_priv = dev->uclass_priv;
+	int banknum;
+	char name[18], *str;
+
+	banknum = plat - mxc_plat;
+	sprintf(name, "GPIO%d_", banknum + 1);
+	str = strdup(name);
+	if (!str)
+		return -ENOMEM;
+	uc_priv->bank_name = str;
+	uc_priv->gpio_count = GPIO_PER_BANK;
+	bank->regs = plat->regs;
+
+	return 0;
+}
+
+U_BOOT_DRIVER(gpio_mxc) = {
+	.name	= "gpio_mxc",
+	.id	= UCLASS_GPIO,
+	.ops	= &gpio_mxc_ops,
+	.probe	= mxc_gpio_probe,
+	.priv_auto_alloc_size = sizeof(struct mxc_bank_info),
+};
+
+U_BOOT_DEVICES(mxc_gpios) = {
+	{ "gpio_mxc", &mxc_plat[0] },
+	{ "gpio_mxc", &mxc_plat[1] },
+	{ "gpio_mxc", &mxc_plat[2] },
+#if defined(CONFIG_MX25) || defined(CONFIG_MX27) || defined(CONFIG_MX51) || \
+		defined(CONFIG_MX53) || defined(CONFIG_MX6)
+	{ "gpio_mxc", &mxc_plat[3] },
+#endif
+#if defined(CONFIG_MX27) || defined(CONFIG_MX53) || defined(CONFIG_MX6)
+	{ "gpio_mxc", &mxc_plat[4] },
+	{ "gpio_mxc", &mxc_plat[5] },
+#endif
+#if defined(CONFIG_MX53) || defined(CONFIG_MX6)
+	{ "gpio_mxc", &mxc_plat[6] },
+#endif
+};
+#endif