u-boot/drivers/gpio/sandbox.c
Simon Glass 2912686c08 gpio: Add a method to convert a GPIO to ACPI
When generating ACPI tables we need to convert GPIOs in U-Boot to the ACPI
structures required by ACPI. This is a SoC-specific conversion and cannot
be handled by generic code, so add a new GPIO method to do the conversion.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2020-07-17 14:32:24 +08:00

529 lines
13 KiB
C

// 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 <acpi/acpi_device.h>
#include <asm/gpio.h>
#include <dm/acpi.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;
}
#if CONFIG_IS_ENABLED(ACPIGEN)
static int sb_gpio_get_acpi(const struct gpio_desc *desc,
struct acpi_gpio *gpio)
{
int ret;
/* Note that gpio_get_acpi() zeroes *gpio before calling here */
gpio->pin_count = 1;
gpio->pins[0] = desc->offset;
ret = acpi_device_scope(desc->dev, gpio->resource,
sizeof(gpio->resource));
if (ret)
return log_ret(ret);
/* All of these values are just used for testing */
if (desc->flags & GPIOD_ACTIVE_LOW) {
gpio->pin0_addr = 0x80012 + desc->offset;
gpio->type = ACPI_GPIO_TYPE_INTERRUPT;
gpio->pull = ACPI_GPIO_PULL_DOWN;
gpio->interrupt_debounce_timeout = 4321;
/* We use the GpioInt part */
gpio->irq.pin = desc->offset;
gpio->irq.polarity = ACPI_IRQ_ACTIVE_BOTH;
gpio->irq.shared = ACPI_IRQ_SHARED;
gpio->irq.wake = ACPI_IRQ_WAKE;
/* The GpioIo part is only used for testing */
gpio->polarity = ACPI_GPIO_ACTIVE_LOW;
} else {
gpio->pin0_addr = 0xc00dc + desc->offset;
gpio->type = ACPI_GPIO_TYPE_IO;
gpio->pull = ACPI_GPIO_PULL_UP;
gpio->interrupt_debounce_timeout = 0;
/* The GpioInt part is not used */
/* We use the GpioIo part */
gpio->output_drive_strength = 1234;
gpio->io_shared = true;
gpio->io_restrict = ACPI_GPIO_IO_RESTRICT_INPUT;
gpio->polarity = 0;
}
return 0;
}
static int sb_gpio_get_name(const struct udevice *dev, char *out_name)
{
return acpi_copy_name(out_name, "GPIO");
}
struct acpi_ops gpio_sandbox_acpi_ops = {
.get_name = sb_gpio_get_name,
};
#endif /* ACPIGEN */
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,
#if CONFIG_IS_ENABLED(ACPIGEN)
.get_acpi = sb_gpio_get_acpi,
#endif
};
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,
ACPI_OPS_PTR(&gpio_sandbox_acpi_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;
}
#if CONFIG_IS_ENABLED(ACPIGEN)
static int sb_pinctrl_get_name(const struct udevice *dev, char *out_name)
{
return acpi_copy_name(out_name, "PINC");
}
#endif
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,
};
#if CONFIG_IS_ENABLED(ACPIGEN)
struct acpi_ops pinctrl_sandbox_acpi_ops = {
.get_name = sb_pinctrl_get_name,
};
#endif
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),
ACPI_OPS_PTR(&pinctrl_sandbox_acpi_ops)
};