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u-boot/drivers/gpio/sandbox.c
Walter Lozano addf358bac core: add support for U_BOOT_DRIVER_ALIAS 
Currently when using OF_PLATDATA the binding between devices and drivers
is done trying to match the compatible string in the node with a driver
name. However, usually a single driver supports multiple compatible strings
which causes that only devices which its compatible string matches a
driver name get bound.

To overcome this issue, this patch adds the U_BOOT_DRIVER_ALIAS macro,
which generates no code at all, but allows an easy way to declare driver
name aliases. Thanks to this, dtoc could be improve to look for the driver
name based on its alias when it populates the U_BOOT_DEVICE entry.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2020-07-09 18:57:22 -06:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2011 The Chromium OS Authors.
*/
#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>
struct gpio_state {
const char *label; /* label given by requester */
ulong dir_flags; /* dir_flags (GPIOD_...) */
};
/* Access routines for GPIO dir flags */
static ulong *get_gpio_dir_flags(struct udevice *dev, unsigned int offset)
{
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[offset].dir_flags;
}
static int get_gpio_flag(struct udevice *dev, unsigned int offset, ulong flag)
{
return (*get_gpio_dir_flags(dev, offset) & flag) != 0;
}
static int set_gpio_flag(struct udevice *dev, unsigned int offset, ulong flag,
int value)
{
ulong *gpio = get_gpio_dir_flags(dev, offset);
if (value)
*gpio |= flag;
else
*gpio &= ~flag;
return 0;
}
/*
* Back-channel sandbox-internal-only access to GPIO state
*/
int sandbox_gpio_get_value(struct udevice *dev, unsigned offset)
{
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(struct udevice *dev, unsigned offset, int value)
{
return set_gpio_flag(dev, offset, GPIOD_IS_OUT_ACTIVE, value);
}
int sandbox_gpio_get_direction(struct udevice *dev, unsigned offset)
{
return get_gpio_flag(dev, offset, GPIOD_IS_OUT);
}
int sandbox_gpio_set_direction(struct udevice *dev, unsigned offset, int 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 'offset' as an input */
static int sb_gpio_direction_input(struct udevice *dev, unsigned offset)
{
debug("%s: offset:%u\n", __func__, offset);
return sandbox_gpio_set_direction(dev, offset, 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);
}
/* read GPIO IN value of port 'offset' */
static int sb_gpio_get_value(struct udevice *dev, unsigned offset)
{
debug("%s: offset:%u\n", __func__, offset);
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_value(dev, offset, value);
}
static int sb_gpio_get_function(struct udevice *dev, unsigned offset)
{
if (get_gpio_flag(dev, offset, GPIOD_IS_OUT))
return GPIOF_OUTPUT;
if (get_gpio_flag(dev, offset, GPIOD_IS_IN))
return GPIOF_INPUT;
return GPIOF_INPUT; /*GPIO is not configurated */
}
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;
}
static int sb_gpio_set_dir_flags(struct udevice *dev, unsigned int offset,
ulong flags)
{
ulong *dir_flags;
debug("%s: offset:%u, dir_flags = %lx\n", __func__, offset, flags);
dir_flags = get_gpio_dir_flags(dev, offset);
*dir_flags = flags;
return 0;
}
static int sb_gpio_get_dir_flags(struct udevice *dev, unsigned int offset,
ulong *flags)
{
debug("%s: offset:%u\n", __func__, offset);
*flags = *get_gpio_dir_flags(dev, offset);
return 0;
}
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(sandbox_gpio) = {
.name = "sandbox_gpio",
.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,
};
U_BOOT_DRIVER_ALIAS(sandbox_gpio, sandbox_gpio_alias)
/* 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),
};
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