+// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2011 The Chromium OS Authors.
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
*/
#include <common.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <log.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>
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/gpio/sandbox-gpio.h>
-/* Flags for each GPIO */
-#define GPIOF_OUTPUT (1 << 0) /* Currently set as an output */
-#define GPIOF_HIGH (1 << 1) /* Currently set high */
-#define GPIOF_RESERVED (1 << 2) /* Is in use / requested */
struct gpio_state {
const char *label; /* label given by requester */
- u8 flags; /* flags (GPIOF_...) */
+ ulong dir_flags; /* dir_flags (GPIOD_...) */
};
-/*
- * State of GPIOs
- * TODO: Put this into sandbox state
- */
-static struct gpio_state state[CONFIG_SANDBOX_GPIO_COUNT];
-
-/* Access routines for GPIO state */
-static u8 *get_gpio_flags(unsigned gp)
+/* Access routines for GPIO dir flags */
+static ulong *get_gpio_dir_flags(struct udevice *dev, unsigned int offset)
{
- /* assert()'s could be disabled, so make sure we handle that */
- assert(gp < ARRAY_SIZE(state));
- if (gp >= ARRAY_SIZE(state)) {
- static u8 invalid_flags;
- printf("sandbox_gpio: error: invalid gpio %u\n", gp);
- return &invalid_flags;
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+ struct gpio_state *state = dev_get_priv(dev);
+
+ if (offset >= uc_priv->gpio_count) {
+ static ulong invalid_dir_flags;
+ printf("sandbox_gpio: error: invalid gpio %u\n", offset);
+ return &invalid_dir_flags;
}
- return &state[gp].flags;
+ return &state[offset].dir_flags;
+
}
-static int get_gpio_flag(unsigned gp, int flag)
+static int get_gpio_flag(struct udevice *dev, unsigned int offset, ulong flag)
{
- return (*get_gpio_flags(gp) & flag) != 0;
+ return (*get_gpio_dir_flags(dev, offset) & flag) != 0;
}
-static int set_gpio_flag(unsigned gp, int flag, int value)
+static int set_gpio_flag(struct udevice *dev, unsigned int offset, ulong flag,
+ int value)
{
- u8 *gpio = get_gpio_flags(gp);
+ ulong *gpio = get_gpio_dir_flags(dev, offset);
if (value)
*gpio |= flag;
return 0;
}
-static int check_reserved(unsigned gpio, const char *func)
-{
- if (!get_gpio_flag(gpio, GPIOF_RESERVED)) {
- printf("sandbox_gpio: %s: error: gpio %u not reserved\n",
- func, gpio);
- return -1;
- }
-
- return 0;
-}
-
/*
* Back-channel sandbox-internal-only access to GPIO state
*/
-int sandbox_gpio_get_value(unsigned gp)
+int sandbox_gpio_get_value(struct udevice *dev, unsigned offset)
{
- if (get_gpio_flag(gp, GPIOF_OUTPUT))
- debug("sandbox_gpio: get_value on output gpio %u\n", gp);
- return get_gpio_flag(gp, GPIOF_HIGH);
+ if (get_gpio_flag(dev, offset, GPIOD_IS_OUT))
+ debug("sandbox_gpio: get_value on output gpio %u\n", offset);
+ return get_gpio_flag(dev, offset, GPIOD_IS_OUT_ACTIVE);
}
-int sandbox_gpio_set_value(unsigned gp, int value)
+int sandbox_gpio_set_value(struct udevice *dev, unsigned offset, int value)
{
- return set_gpio_flag(gp, GPIOF_HIGH, value);
+ return set_gpio_flag(dev, offset, GPIOD_IS_OUT_ACTIVE, value);
}
-int sandbox_gpio_get_direction(unsigned gp)
+int sandbox_gpio_get_direction(struct udevice *dev, unsigned offset)
{
- return get_gpio_flag(gp, GPIOF_OUTPUT);
+ return get_gpio_flag(dev, offset, GPIOD_IS_OUT);
}
-int sandbox_gpio_set_direction(unsigned gp, int output)
+int sandbox_gpio_set_direction(struct udevice *dev, unsigned offset, int output)
{
- return set_gpio_flag(gp, GPIOF_OUTPUT, output);
+ set_gpio_flag(dev, offset, GPIOD_IS_OUT, output);
+ set_gpio_flag(dev, offset, GPIOD_IS_IN, !(output));
+
+ return 0;
+}
+
+ulong sandbox_gpio_get_dir_flags(struct udevice *dev, unsigned int offset)
+{
+ return *get_gpio_dir_flags(dev, offset);
+}
+
+int sandbox_gpio_set_dir_flags(struct udevice *dev, unsigned int offset,
+ ulong flags)
+{
+ *get_gpio_dir_flags(dev, offset) = flags;
+
+ return 0;
}
/*
* These functions implement the public interface within U-Boot
*/
-/* set GPIO port 'gp' as an input */
-int gpio_direction_input(unsigned gp)
+/* set GPIO port 'offset' as an input */
+static int sb_gpio_direction_input(struct udevice *dev, unsigned offset)
{
- debug("%s: gp:%u\n", __func__, gp);
+ debug("%s: offset:%u\n", __func__, offset);
- if (check_reserved(gp, __func__))
- return -1;
+ return sandbox_gpio_set_direction(dev, offset, 0);
+}
- return sandbox_gpio_set_direction(gp, 0);
+/* set GPIO port 'offset' as an output, with polarity 'value' */
+static int sb_gpio_direction_output(struct udevice *dev, unsigned offset,
+ int value)
+{
+ debug("%s: offset:%u, value = %d\n", __func__, offset, value);
+
+ return sandbox_gpio_set_direction(dev, offset, 1) |
+ sandbox_gpio_set_value(dev, offset, value);
}
-/* set GPIO port 'gp' as an output, with polarity 'value' */
-int gpio_direction_output(unsigned gp, int value)
+/* read GPIO IN value of port 'offset' */
+static int sb_gpio_get_value(struct udevice *dev, unsigned offset)
{
- debug("%s: gp:%u, value = %d\n", __func__, gp, value);
+ debug("%s: offset:%u\n", __func__, offset);
- if (check_reserved(gp, __func__))
+ return sandbox_gpio_get_value(dev, offset);
+}
+
+/* write GPIO OUT value to port 'offset' */
+static int sb_gpio_set_value(struct udevice *dev, unsigned offset, int value)
+{
+ debug("%s: offset:%u, value = %d\n", __func__, offset, value);
+
+ if (!sandbox_gpio_get_direction(dev, offset)) {
+ printf("sandbox_gpio: error: set_value on input gpio %u\n",
+ offset);
return -1;
+ }
- return sandbox_gpio_set_direction(gp, 1) |
- sandbox_gpio_set_value(gp, value);
+ return sandbox_gpio_set_value(dev, offset, value);
}
-/* read GPIO IN value of port 'gp' */
-int gpio_get_value(unsigned gp)
+static int sb_gpio_get_function(struct udevice *dev, unsigned offset)
{
- debug("%s: gp:%u\n", __func__, gp);
+ if (get_gpio_flag(dev, offset, GPIOD_IS_OUT))
+ return GPIOF_OUTPUT;
+ if (get_gpio_flag(dev, offset, GPIOD_IS_IN))
+ return GPIOF_INPUT;
- if (check_reserved(gp, __func__))
- return -1;
+ return GPIOF_INPUT; /*GPIO is not configurated */
+}
- return sandbox_gpio_get_value(gp);
+static int sb_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
+ struct ofnode_phandle_args *args)
+{
+ desc->offset = args->args[0];
+ if (args->args_count < 2)
+ return 0;
+ /* treat generic binding with gpio uclass */
+ gpio_xlate_offs_flags(dev, desc, args);
+
+ /* sandbox test specific, not defined in gpio.h */
+ if (args->args[1] & GPIO_IN)
+ desc->flags |= GPIOD_IS_IN;
+
+ if (args->args[1] & GPIO_OUT)
+ desc->flags |= GPIOD_IS_OUT;
+
+ if (args->args[1] & GPIO_OUT_ACTIVE)
+ desc->flags |= GPIOD_IS_OUT_ACTIVE;
+
+ return 0;
}
-/* write GPIO OUT value to port 'gp' */
-int gpio_set_value(unsigned gp, int value)
+static int sb_gpio_set_dir_flags(struct udevice *dev, unsigned int offset,
+ ulong flags)
{
- debug("%s: gp:%u, value = %d\n", __func__, gp, value);
+ ulong *dir_flags;
- if (check_reserved(gp, __func__))
- return -1;
+ debug("%s: offset:%u, dir_flags = %lx\n", __func__, offset, flags);
- if (!sandbox_gpio_get_direction(gp)) {
- printf("sandbox_gpio: error: set_value on input gpio %u\n", gp);
- return -1;
- }
+ dir_flags = get_gpio_dir_flags(dev, offset);
- return sandbox_gpio_set_value(gp, value);
+ *dir_flags = flags;
+
+ return 0;
}
-int gpio_request(unsigned gp, const char *label)
+static int sb_gpio_get_dir_flags(struct udevice *dev, unsigned int offset,
+ ulong *flags)
{
- debug("%s: gp:%u, label:%s\n", __func__, gp, label);
+ debug("%s: offset:%u\n", __func__, offset);
+ *flags = *get_gpio_dir_flags(dev, offset);
- if (gp >= ARRAY_SIZE(state)) {
- printf("sandbox_gpio: error: invalid gpio %u\n", gp);
- return -1;
- }
+ return 0;
+}
- if (get_gpio_flag(gp, GPIOF_RESERVED)) {
- printf("sandbox_gpio: error: gpio %u already reserved\n", gp);
- return -1;
+static const struct dm_gpio_ops gpio_sandbox_ops = {
+ .direction_input = sb_gpio_direction_input,
+ .direction_output = sb_gpio_direction_output,
+ .get_value = sb_gpio_get_value,
+ .set_value = sb_gpio_set_value,
+ .get_function = sb_gpio_get_function,
+ .xlate = sb_gpio_xlate,
+ .set_dir_flags = sb_gpio_set_dir_flags,
+ .get_dir_flags = sb_gpio_get_dir_flags,
+};
+
+static int sandbox_gpio_ofdata_to_platdata(struct udevice *dev)
+{
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+
+ uc_priv->gpio_count = dev_read_u32_default(dev, "sandbox,gpio-count",
+ 0);
+ uc_priv->bank_name = dev_read_string(dev, "gpio-bank-name");
+
+ return 0;
+}
+
+static int gpio_sandbox_probe(struct udevice *dev)
+{
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+
+ if (!dev_of_valid(dev))
+ /* Tell the uclass how many GPIOs we have */
+ uc_priv->gpio_count = CONFIG_SANDBOX_GPIO_COUNT;
+
+ dev->priv = calloc(sizeof(struct gpio_state), uc_priv->gpio_count);
+
+ return 0;
+}
+
+static int gpio_sandbox_remove(struct udevice *dev)
+{
+ free(dev->priv);
+
+ return 0;
+}
+
+static const struct udevice_id sandbox_gpio_ids[] = {
+ { .compatible = "sandbox,gpio" },
+ { }
+};
+
+U_BOOT_DRIVER(gpio_sandbox) = {
+ .name = "gpio_sandbox",
+ .id = UCLASS_GPIO,
+ .of_match = sandbox_gpio_ids,
+ .ofdata_to_platdata = sandbox_gpio_ofdata_to_platdata,
+ .probe = gpio_sandbox_probe,
+ .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);
}
- state[gp].label = label;
- return set_gpio_flag(gp, GPIOF_RESERVED, 1);
+ return 0;
}
-int gpio_free(unsigned gp)
+static int sb_pinctrl_get_pins_count(struct udevice *dev)
{
- debug("%s: gp:%u\n", __func__, gp);
+ 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;
+ }
- if (check_reserved(gp, __func__))
- return -1;
+ 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;
+ }
- state[gp].label = NULL;
- return set_gpio_flag(gp, GPIOF_RESERVED, 0);
+ return NULL;
}
-/* Display GPIO information */
-void gpio_info(void)
+static const char *sb_pinctrl_get_pin_name(struct udevice *dev,
+ unsigned int selector)
{
- unsigned gpio;
+ 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);
+ }
- puts("Sandbox GPIOs\n");
+ return pin_name;
+}
- for (gpio = 0; gpio < ARRAY_SIZE(state); ++gpio) {
- const char *label = state[gpio].label;
+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 ".";
+}
- printf("%4d: %s: %d [%c] %s\n",
- gpio,
- sandbox_gpio_get_direction(gpio) ? "out" : " in",
- sandbox_gpio_get_value(gpio),
- get_gpio_flag(gpio, GPIOF_RESERVED) ? 'x' : ' ',
- label ? label : "");
+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),
+};
git.openpandora.org / pandora-u-boot.git / blobdiff