mirror of
https://source.denx.de/u-boot/u-boot.git
synced 2025-11-04 10:21:25 +01:00
54aa07fdfc
This uses the newly-added dm_gpio_get_values_as_int_base3 function to implement a sysinfo device. The revision map is stored in the device tree. Signed-off-by: Sean Anderson <sean.anderson@seco.com> Reviewed-by: Simon Glass <sjg@chromium.org>
142 lines
3.1 KiB
C
142 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2021 Sean Anderson <sean.anderson@seco.com>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <log.h>
|
|
#include <sysinfo.h>
|
|
#include <asm/gpio.h>
|
|
#include <dm/device_compat.h>
|
|
|
|
/**
|
|
* struct sysinfo_gpio_priv - GPIO sysinfo private data
|
|
* @gpios: List of GPIOs used to detect the revision
|
|
* @gpio_num: The number of GPIOs in @gpios
|
|
* @revision: The revision as detected from the GPIOs.
|
|
*/
|
|
struct sysinfo_gpio_priv {
|
|
struct gpio_desc *gpios;
|
|
int gpio_num, revision;
|
|
};
|
|
|
|
static int sysinfo_gpio_detect(struct udevice *dev)
|
|
{
|
|
int ret;
|
|
struct sysinfo_gpio_priv *priv = dev_get_priv(dev);
|
|
|
|
ret = dm_gpio_get_values_as_int_base3(priv->gpios, priv->gpio_num);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
priv->revision = ret;
|
|
return 0;
|
|
}
|
|
|
|
static int sysinfo_gpio_get_int(struct udevice *dev, int id, int *val)
|
|
{
|
|
struct sysinfo_gpio_priv *priv = dev_get_priv(dev);
|
|
|
|
switch (id) {
|
|
case SYSINFO_ID_BOARD_MODEL:
|
|
*val = priv->revision;
|
|
return 0;
|
|
default:
|
|
return -EINVAL;
|
|
};
|
|
}
|
|
|
|
static int sysinfo_gpio_get_str(struct udevice *dev, int id, size_t size, char *val)
|
|
{
|
|
struct sysinfo_gpio_priv *priv = dev_get_priv(dev);
|
|
|
|
switch (id) {
|
|
case SYSINFO_ID_BOARD_MODEL: {
|
|
const char *name = NULL;
|
|
int i, ret;
|
|
u32 revision;
|
|
|
|
for (i = 0; i < priv->gpio_num; i++) {
|
|
ret = dev_read_u32_index(dev, "revisions", i,
|
|
&revision);
|
|
if (ret) {
|
|
if (ret != -EOVERFLOW)
|
|
return ret;
|
|
break;
|
|
}
|
|
|
|
if (revision == priv->revision) {
|
|
ret = dev_read_string_index(dev, "names", i,
|
|
&name);
|
|
if (ret < 0)
|
|
return ret;
|
|
break;
|
|
}
|
|
}
|
|
if (!name)
|
|
name = "unknown";
|
|
|
|
strncpy(val, name, size);
|
|
val[size - 1] = '\0';
|
|
return 0;
|
|
} default:
|
|
return -EINVAL;
|
|
};
|
|
}
|
|
|
|
static const struct sysinfo_ops sysinfo_gpio_ops = {
|
|
.detect = sysinfo_gpio_detect,
|
|
.get_int = sysinfo_gpio_get_int,
|
|
.get_str = sysinfo_gpio_get_str,
|
|
};
|
|
|
|
static int sysinfo_gpio_probe(struct udevice *dev)
|
|
{
|
|
int ret;
|
|
struct sysinfo_gpio_priv *priv = dev_get_priv(dev);
|
|
|
|
priv->gpio_num = gpio_get_list_count(dev, "gpios");
|
|
if (priv->gpio_num < 0) {
|
|
dev_err(dev, "could not get gpios length (err = %d)\n",
|
|
priv->gpio_num);
|
|
return priv->gpio_num;
|
|
}
|
|
|
|
priv->gpios = calloc(priv->gpio_num, sizeof(*priv->gpios));
|
|
if (!priv->gpios) {
|
|
dev_err(dev, "could not allocate memory for %d gpios\n",
|
|
priv->gpio_num);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ret = gpio_request_list_by_name(dev, "gpios", priv->gpios,
|
|
priv->gpio_num, GPIOD_IS_IN);
|
|
if (ret != priv->gpio_num) {
|
|
dev_err(dev, "could not get gpios (err = %d)\n",
|
|
priv->gpio_num);
|
|
return ret;
|
|
}
|
|
|
|
if (!dev_read_bool(dev, "revisions") || !dev_read_bool(dev, "names")) {
|
|
dev_err(dev, "revisions or names properties missing\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct udevice_id sysinfo_gpio_ids[] = {
|
|
{ .compatible = "gpio-sysinfo" },
|
|
{ /* sentinel */ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(sysinfo_gpio) = {
|
|
.name = "sysinfo_gpio",
|
|
.id = UCLASS_SYSINFO,
|
|
.of_match = sysinfo_gpio_ids,
|
|
.ops = &sysinfo_gpio_ops,
|
|
.priv_auto = sizeof(struct sysinfo_gpio_priv),
|
|
.probe = sysinfo_gpio_probe,
|
|
};
|