#include <fdtdec.h>
#include <malloc.h>
#include <asm/gpio.h>
+#include <dm/device_compat.h>
#include <dm/lists.h>
#include <dm/of.h>
#include <dm/pinctrl.h>
.remove = gpio_sandbox_remove,
.ops = &gpio_sandbox_ops,
};
+
+/* pincontrol: used only to check GPIO pin configuration (pinmux command) */
+
+struct sb_pinctrl_priv {
+ int pinctrl_ngpios;
+ struct list_head gpio_dev;
+};
+
+struct sb_gpio_bank {
+ struct udevice *gpio_dev;
+ struct list_head list;
+};
+
+static int sb_populate_gpio_dev_list(struct udevice *dev)
+{
+ struct sb_pinctrl_priv *priv = dev_get_priv(dev);
+ struct udevice *gpio_dev;
+ struct udevice *child;
+ struct sb_gpio_bank *gpio_bank;
+ int ret;
+
+ /*
+ * parse pin-controller sub-nodes (ie gpio bank nodes) and fill
+ * a list with all gpio device reference which belongs to the
+ * current pin-controller. This list is used to find pin_name and
+ * pin muxing
+ */
+ list_for_each_entry(child, &dev->child_head, sibling_node) {
+ ret = uclass_get_device_by_name(UCLASS_GPIO, child->name,
+ &gpio_dev);
+ if (ret < 0)
+ continue;
+
+ gpio_bank = malloc(sizeof(*gpio_bank));
+ if (!gpio_bank) {
+ dev_err(dev, "Not enough memory\n");
+ return -ENOMEM;
+ }
+
+ gpio_bank->gpio_dev = gpio_dev;
+ list_add_tail(&gpio_bank->list, &priv->gpio_dev);
+ }
+
+ return 0;
+}
+
+static int sb_pinctrl_get_pins_count(struct udevice *dev)
+{
+ struct sb_pinctrl_priv *priv = dev_get_priv(dev);
+ struct gpio_dev_priv *uc_priv;
+ struct sb_gpio_bank *gpio_bank;
+
+ /*
+ * if get_pins_count has already been executed once on this
+ * pin-controller, no need to run it again
+ */
+ if (priv->pinctrl_ngpios)
+ return priv->pinctrl_ngpios;
+
+ if (list_empty(&priv->gpio_dev))
+ sb_populate_gpio_dev_list(dev);
+ /*
+ * walk through all banks to retrieve the pin-controller
+ * pins number
+ */
+ list_for_each_entry(gpio_bank, &priv->gpio_dev, list) {
+ uc_priv = dev_get_uclass_priv(gpio_bank->gpio_dev);
+
+ priv->pinctrl_ngpios += uc_priv->gpio_count;
+ }
+
+ return priv->pinctrl_ngpios;
+}
+
+static struct udevice *sb_pinctrl_get_gpio_dev(struct udevice *dev,
+ unsigned int selector,
+ unsigned int *idx)
+{
+ struct sb_pinctrl_priv *priv = dev_get_priv(dev);
+ struct sb_gpio_bank *gpio_bank;
+ struct gpio_dev_priv *uc_priv;
+ int pin_count = 0;
+
+ if (list_empty(&priv->gpio_dev))
+ sb_populate_gpio_dev_list(dev);
+
+ /* look up for the bank which owns the requested pin */
+ list_for_each_entry(gpio_bank, &priv->gpio_dev, list) {
+ uc_priv = dev_get_uclass_priv(gpio_bank->gpio_dev);
+
+ if (selector < (pin_count + uc_priv->gpio_count)) {
+ /*
+ * we found the bank, convert pin selector to
+ * gpio bank index
+ */
+ *idx = selector - pin_count;
+
+ return gpio_bank->gpio_dev;
+ }
+ pin_count += uc_priv->gpio_count;
+ }
+
+ return NULL;
+}
+
+static const char *sb_pinctrl_get_pin_name(struct udevice *dev,
+ unsigned int selector)
+{
+ struct gpio_dev_priv *uc_priv;
+ struct udevice *gpio_dev;
+ unsigned int gpio_idx;
+ static char pin_name[PINNAME_SIZE];
+
+ /* look up for the bank which owns the requested pin */
+ gpio_dev = sb_pinctrl_get_gpio_dev(dev, selector, &gpio_idx);
+ if (!gpio_dev) {
+ snprintf(pin_name, PINNAME_SIZE, "Error");
+ } else {
+ uc_priv = dev_get_uclass_priv(gpio_dev);
+
+ snprintf(pin_name, PINNAME_SIZE, "%s%d",
+ uc_priv->bank_name,
+ gpio_idx);
+ }
+
+ return pin_name;
+}
+
+static char *get_dir_flags_string(ulong flags)
+{
+ if (flags & GPIOD_OPEN_DRAIN)
+ return "drive-open-drain";
+ if (flags & GPIOD_OPEN_SOURCE)
+ return "drive-open-source";
+ if (flags & GPIOD_PULL_UP)
+ return "bias-pull-up";
+ if (flags & GPIOD_PULL_DOWN)
+ return "bias-pull-down";
+ return ".";
+}
+
+static int sb_pinctrl_get_pin_muxing(struct udevice *dev,
+ unsigned int selector,
+ char *buf, int size)
+{
+ struct udevice *gpio_dev;
+ unsigned int gpio_idx;
+ ulong dir_flags;
+ int function;
+
+ /* look up for the bank which owns the requested pin */
+ gpio_dev = sb_pinctrl_get_gpio_dev(dev, selector, &gpio_idx);
+ if (!gpio_dev) {
+ snprintf(buf, size, "Error");
+ } else {
+ function = sb_gpio_get_function(gpio_dev, gpio_idx);
+ dir_flags = *get_gpio_dir_flags(gpio_dev, gpio_idx);
+
+ snprintf(buf, size, "gpio %s %s",
+ function == GPIOF_OUTPUT ? "output" : "input",
+ get_dir_flags_string(dir_flags));
+ }
+
+ return 0;
+}
+
+static int sandbox_pinctrl_probe(struct udevice *dev)
+{
+ struct sb_pinctrl_priv *priv = dev_get_priv(dev);
+
+ INIT_LIST_HEAD(&priv->gpio_dev);
+
+ return 0;
+}
+
+static struct pinctrl_ops sandbox_pinctrl_gpio_ops = {
+ .get_pin_name = sb_pinctrl_get_pin_name,
+ .get_pins_count = sb_pinctrl_get_pins_count,
+ .get_pin_muxing = sb_pinctrl_get_pin_muxing,
+};
+
+static const struct udevice_id sandbox_pinctrl_gpio_match[] = {
+ { .compatible = "sandbox,pinctrl-gpio" },
+ { /* sentinel */ }
+};
+
+U_BOOT_DRIVER(sandbox_pinctrl_gpio) = {
+ .name = "sandbox_pinctrl_gpio",
+ .id = UCLASS_PINCTRL,
+ .of_match = sandbox_pinctrl_gpio_match,
+ .ops = &sandbox_pinctrl_gpio_ops,
+ .bind = dm_scan_fdt_dev,
+ .probe = sandbox_pinctrl_probe,
+ .priv_auto_alloc_size = sizeof(struct sb_pinctrl_priv),
+};
projects / u-boot.git / commitdiff
