mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-21 17:38:51 +09:00
![Simon Glass](/assets/img/avatar_default.png)
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>
530 lines
13 KiB
C
530 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2011 The Chromium OS Authors.
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*/
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#include <common.h>
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#include <dm.h>
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#include <fdtdec.h>
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#include <log.h>
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#include <malloc.h>
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#include <acpi/acpi_device.h>
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#include <asm/gpio.h>
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#include <dm/acpi.h>
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#include <dm/device_compat.h>
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#include <dm/lists.h>
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#include <dm/of.h>
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#include <dm/pinctrl.h>
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#include <dt-bindings/gpio/gpio.h>
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#include <dt-bindings/gpio/sandbox-gpio.h>
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struct gpio_state {
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const char *label; /* label given by requester */
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ulong dir_flags; /* dir_flags (GPIOD_...) */
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};
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/* Access routines for GPIO dir flags */
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static ulong *get_gpio_dir_flags(struct udevice *dev, unsigned int offset)
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{
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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struct gpio_state *state = dev_get_priv(dev);
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if (offset >= uc_priv->gpio_count) {
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static ulong invalid_dir_flags;
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printf("sandbox_gpio: error: invalid gpio %u\n", offset);
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return &invalid_dir_flags;
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}
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return &state[offset].dir_flags;
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}
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static int get_gpio_flag(struct udevice *dev, unsigned int offset, ulong flag)
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{
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return (*get_gpio_dir_flags(dev, offset) & flag) != 0;
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}
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static int set_gpio_flag(struct udevice *dev, unsigned int offset, ulong flag,
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int value)
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{
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ulong *gpio = get_gpio_dir_flags(dev, offset);
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if (value)
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*gpio |= flag;
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else
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*gpio &= ~flag;
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return 0;
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}
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/*
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* Back-channel sandbox-internal-only access to GPIO state
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*/
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int sandbox_gpio_get_value(struct udevice *dev, unsigned offset)
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{
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if (get_gpio_flag(dev, offset, GPIOD_IS_OUT))
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debug("sandbox_gpio: get_value on output gpio %u\n", offset);
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return get_gpio_flag(dev, offset, GPIOD_IS_OUT_ACTIVE);
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}
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int sandbox_gpio_set_value(struct udevice *dev, unsigned offset, int value)
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{
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return set_gpio_flag(dev, offset, GPIOD_IS_OUT_ACTIVE, value);
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}
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int sandbox_gpio_get_direction(struct udevice *dev, unsigned offset)
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{
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return get_gpio_flag(dev, offset, GPIOD_IS_OUT);
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}
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int sandbox_gpio_set_direction(struct udevice *dev, unsigned offset, int output)
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{
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set_gpio_flag(dev, offset, GPIOD_IS_OUT, output);
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set_gpio_flag(dev, offset, GPIOD_IS_IN, !(output));
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return 0;
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}
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ulong sandbox_gpio_get_dir_flags(struct udevice *dev, unsigned int offset)
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{
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return *get_gpio_dir_flags(dev, offset);
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}
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int sandbox_gpio_set_dir_flags(struct udevice *dev, unsigned int offset,
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ulong flags)
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{
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*get_gpio_dir_flags(dev, offset) = flags;
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return 0;
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}
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/*
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* These functions implement the public interface within U-Boot
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*/
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/* set GPIO port 'offset' as an input */
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static int sb_gpio_direction_input(struct udevice *dev, unsigned offset)
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{
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debug("%s: offset:%u\n", __func__, offset);
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return sandbox_gpio_set_direction(dev, offset, 0);
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}
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/* set GPIO port 'offset' as an output, with polarity 'value' */
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static int sb_gpio_direction_output(struct udevice *dev, unsigned offset,
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int value)
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{
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debug("%s: offset:%u, value = %d\n", __func__, offset, value);
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return sandbox_gpio_set_direction(dev, offset, 1) |
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sandbox_gpio_set_value(dev, offset, value);
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}
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/* read GPIO IN value of port 'offset' */
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static int sb_gpio_get_value(struct udevice *dev, unsigned offset)
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{
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debug("%s: offset:%u\n", __func__, offset);
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return sandbox_gpio_get_value(dev, offset);
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}
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/* write GPIO OUT value to port 'offset' */
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static int sb_gpio_set_value(struct udevice *dev, unsigned offset, int value)
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{
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debug("%s: offset:%u, value = %d\n", __func__, offset, value);
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if (!sandbox_gpio_get_direction(dev, offset)) {
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printf("sandbox_gpio: error: set_value on input gpio %u\n",
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offset);
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return -1;
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}
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return sandbox_gpio_set_value(dev, offset, value);
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}
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static int sb_gpio_get_function(struct udevice *dev, unsigned offset)
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{
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if (get_gpio_flag(dev, offset, GPIOD_IS_OUT))
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return GPIOF_OUTPUT;
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if (get_gpio_flag(dev, offset, GPIOD_IS_IN))
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return GPIOF_INPUT;
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return GPIOF_INPUT; /*GPIO is not configurated */
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}
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static int sb_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
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struct ofnode_phandle_args *args)
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{
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desc->offset = args->args[0];
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if (args->args_count < 2)
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return 0;
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/* treat generic binding with gpio uclass */
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gpio_xlate_offs_flags(dev, desc, args);
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/* sandbox test specific, not defined in gpio.h */
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if (args->args[1] & GPIO_IN)
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desc->flags |= GPIOD_IS_IN;
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if (args->args[1] & GPIO_OUT)
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desc->flags |= GPIOD_IS_OUT;
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if (args->args[1] & GPIO_OUT_ACTIVE)
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desc->flags |= GPIOD_IS_OUT_ACTIVE;
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return 0;
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}
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static int sb_gpio_set_dir_flags(struct udevice *dev, unsigned int offset,
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ulong flags)
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{
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ulong *dir_flags;
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debug("%s: offset:%u, dir_flags = %lx\n", __func__, offset, flags);
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dir_flags = get_gpio_dir_flags(dev, offset);
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*dir_flags = flags;
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return 0;
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}
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static int sb_gpio_get_dir_flags(struct udevice *dev, unsigned int offset,
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ulong *flags)
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{
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debug("%s: offset:%u\n", __func__, offset);
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*flags = *get_gpio_dir_flags(dev, offset);
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return 0;
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}
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#if CONFIG_IS_ENABLED(ACPIGEN)
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static int sb_gpio_get_acpi(const struct gpio_desc *desc,
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struct acpi_gpio *gpio)
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{
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int ret;
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/* Note that gpio_get_acpi() zeroes *gpio before calling here */
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gpio->pin_count = 1;
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gpio->pins[0] = desc->offset;
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ret = acpi_device_scope(desc->dev, gpio->resource,
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sizeof(gpio->resource));
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if (ret)
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return log_ret(ret);
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/* All of these values are just used for testing */
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if (desc->flags & GPIOD_ACTIVE_LOW) {
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gpio->pin0_addr = 0x80012 + desc->offset;
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gpio->type = ACPI_GPIO_TYPE_INTERRUPT;
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gpio->pull = ACPI_GPIO_PULL_DOWN;
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gpio->interrupt_debounce_timeout = 4321;
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/* We use the GpioInt part */
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gpio->irq.pin = desc->offset;
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gpio->irq.polarity = ACPI_IRQ_ACTIVE_BOTH;
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gpio->irq.shared = ACPI_IRQ_SHARED;
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gpio->irq.wake = ACPI_IRQ_WAKE;
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/* The GpioIo part is only used for testing */
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gpio->polarity = ACPI_GPIO_ACTIVE_LOW;
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} else {
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gpio->pin0_addr = 0xc00dc + desc->offset;
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gpio->type = ACPI_GPIO_TYPE_IO;
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gpio->pull = ACPI_GPIO_PULL_UP;
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gpio->interrupt_debounce_timeout = 0;
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/* The GpioInt part is not used */
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/* We use the GpioIo part */
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gpio->output_drive_strength = 1234;
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gpio->io_shared = true;
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gpio->io_restrict = ACPI_GPIO_IO_RESTRICT_INPUT;
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gpio->polarity = 0;
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}
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return 0;
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}
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static int sb_gpio_get_name(const struct udevice *dev, char *out_name)
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{
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return acpi_copy_name(out_name, "GPIO");
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}
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struct acpi_ops gpio_sandbox_acpi_ops = {
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.get_name = sb_gpio_get_name,
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};
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#endif /* ACPIGEN */
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static const struct dm_gpio_ops gpio_sandbox_ops = {
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.direction_input = sb_gpio_direction_input,
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.direction_output = sb_gpio_direction_output,
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.get_value = sb_gpio_get_value,
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.set_value = sb_gpio_set_value,
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.get_function = sb_gpio_get_function,
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.xlate = sb_gpio_xlate,
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.set_dir_flags = sb_gpio_set_dir_flags,
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.get_dir_flags = sb_gpio_get_dir_flags,
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#if CONFIG_IS_ENABLED(ACPIGEN)
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.get_acpi = sb_gpio_get_acpi,
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#endif
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};
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static int sandbox_gpio_ofdata_to_platdata(struct udevice *dev)
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{
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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uc_priv->gpio_count = dev_read_u32_default(dev, "sandbox,gpio-count",
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0);
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uc_priv->bank_name = dev_read_string(dev, "gpio-bank-name");
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return 0;
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}
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static int gpio_sandbox_probe(struct udevice *dev)
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{
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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if (!dev_of_valid(dev))
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/* Tell the uclass how many GPIOs we have */
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uc_priv->gpio_count = CONFIG_SANDBOX_GPIO_COUNT;
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dev->priv = calloc(sizeof(struct gpio_state), uc_priv->gpio_count);
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return 0;
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}
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static int gpio_sandbox_remove(struct udevice *dev)
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{
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free(dev->priv);
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return 0;
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}
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static const struct udevice_id sandbox_gpio_ids[] = {
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{ .compatible = "sandbox,gpio" },
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{ }
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};
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U_BOOT_DRIVER(sandbox_gpio) = {
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.name = "sandbox_gpio",
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.id = UCLASS_GPIO,
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.of_match = sandbox_gpio_ids,
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.ofdata_to_platdata = sandbox_gpio_ofdata_to_platdata,
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.probe = gpio_sandbox_probe,
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.remove = gpio_sandbox_remove,
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.ops = &gpio_sandbox_ops,
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ACPI_OPS_PTR(&gpio_sandbox_acpi_ops)
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};
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U_BOOT_DRIVER_ALIAS(sandbox_gpio, sandbox_gpio_alias)
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/* pincontrol: used only to check GPIO pin configuration (pinmux command) */
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struct sb_pinctrl_priv {
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int pinctrl_ngpios;
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struct list_head gpio_dev;
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};
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struct sb_gpio_bank {
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struct udevice *gpio_dev;
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struct list_head list;
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};
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static int sb_populate_gpio_dev_list(struct udevice *dev)
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{
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struct sb_pinctrl_priv *priv = dev_get_priv(dev);
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struct udevice *gpio_dev;
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struct udevice *child;
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struct sb_gpio_bank *gpio_bank;
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int ret;
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/*
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* parse pin-controller sub-nodes (ie gpio bank nodes) and fill
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* a list with all gpio device reference which belongs to the
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* current pin-controller. This list is used to find pin_name and
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* pin muxing
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*/
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list_for_each_entry(child, &dev->child_head, sibling_node) {
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ret = uclass_get_device_by_name(UCLASS_GPIO, child->name,
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&gpio_dev);
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if (ret < 0)
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continue;
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gpio_bank = malloc(sizeof(*gpio_bank));
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if (!gpio_bank) {
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dev_err(dev, "Not enough memory\n");
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return -ENOMEM;
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}
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gpio_bank->gpio_dev = gpio_dev;
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list_add_tail(&gpio_bank->list, &priv->gpio_dev);
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}
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return 0;
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}
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static int sb_pinctrl_get_pins_count(struct udevice *dev)
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{
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struct sb_pinctrl_priv *priv = dev_get_priv(dev);
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struct gpio_dev_priv *uc_priv;
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struct sb_gpio_bank *gpio_bank;
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/*
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* if get_pins_count has already been executed once on this
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* pin-controller, no need to run it again
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*/
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if (priv->pinctrl_ngpios)
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return priv->pinctrl_ngpios;
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if (list_empty(&priv->gpio_dev))
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sb_populate_gpio_dev_list(dev);
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/*
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* walk through all banks to retrieve the pin-controller
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* pins number
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*/
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list_for_each_entry(gpio_bank, &priv->gpio_dev, list) {
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uc_priv = dev_get_uclass_priv(gpio_bank->gpio_dev);
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priv->pinctrl_ngpios += uc_priv->gpio_count;
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}
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return priv->pinctrl_ngpios;
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}
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static struct udevice *sb_pinctrl_get_gpio_dev(struct udevice *dev,
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unsigned int selector,
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unsigned int *idx)
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{
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struct sb_pinctrl_priv *priv = dev_get_priv(dev);
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struct sb_gpio_bank *gpio_bank;
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struct gpio_dev_priv *uc_priv;
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int pin_count = 0;
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if (list_empty(&priv->gpio_dev))
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sb_populate_gpio_dev_list(dev);
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/* look up for the bank which owns the requested pin */
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list_for_each_entry(gpio_bank, &priv->gpio_dev, list) {
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uc_priv = dev_get_uclass_priv(gpio_bank->gpio_dev);
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if (selector < (pin_count + uc_priv->gpio_count)) {
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/*
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* we found the bank, convert pin selector to
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* gpio bank index
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*/
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*idx = selector - pin_count;
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return gpio_bank->gpio_dev;
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}
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pin_count += uc_priv->gpio_count;
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}
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return NULL;
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}
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static const char *sb_pinctrl_get_pin_name(struct udevice *dev,
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unsigned int selector)
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{
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struct gpio_dev_priv *uc_priv;
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struct udevice *gpio_dev;
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unsigned int gpio_idx;
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static char pin_name[PINNAME_SIZE];
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/* look up for the bank which owns the requested pin */
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gpio_dev = sb_pinctrl_get_gpio_dev(dev, selector, &gpio_idx);
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if (!gpio_dev) {
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snprintf(pin_name, PINNAME_SIZE, "Error");
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} else {
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uc_priv = dev_get_uclass_priv(gpio_dev);
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snprintf(pin_name, PINNAME_SIZE, "%s%d",
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uc_priv->bank_name,
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gpio_idx);
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}
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return pin_name;
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}
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static char *get_dir_flags_string(ulong flags)
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{
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if (flags & GPIOD_OPEN_DRAIN)
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return "drive-open-drain";
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if (flags & GPIOD_OPEN_SOURCE)
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return "drive-open-source";
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if (flags & GPIOD_PULL_UP)
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return "bias-pull-up";
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if (flags & GPIOD_PULL_DOWN)
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return "bias-pull-down";
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return ".";
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}
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static int sb_pinctrl_get_pin_muxing(struct udevice *dev,
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unsigned int selector,
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char *buf, int size)
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{
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struct udevice *gpio_dev;
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unsigned int gpio_idx;
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ulong dir_flags;
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int function;
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/* look up for the bank which owns the requested pin */
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gpio_dev = sb_pinctrl_get_gpio_dev(dev, selector, &gpio_idx);
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if (!gpio_dev) {
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snprintf(buf, size, "Error");
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} else {
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function = sb_gpio_get_function(gpio_dev, gpio_idx);
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dir_flags = *get_gpio_dir_flags(gpio_dev, gpio_idx);
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snprintf(buf, size, "gpio %s %s",
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function == GPIOF_OUTPUT ? "output" : "input",
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get_dir_flags_string(dir_flags));
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}
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return 0;
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}
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#if CONFIG_IS_ENABLED(ACPIGEN)
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static int sb_pinctrl_get_name(const struct udevice *dev, char *out_name)
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{
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return acpi_copy_name(out_name, "PINC");
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}
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#endif
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static int sandbox_pinctrl_probe(struct udevice *dev)
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{
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struct sb_pinctrl_priv *priv = dev_get_priv(dev);
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INIT_LIST_HEAD(&priv->gpio_dev);
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return 0;
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}
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static struct pinctrl_ops sandbox_pinctrl_gpio_ops = {
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.get_pin_name = sb_pinctrl_get_pin_name,
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.get_pins_count = sb_pinctrl_get_pins_count,
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.get_pin_muxing = sb_pinctrl_get_pin_muxing,
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};
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#if CONFIG_IS_ENABLED(ACPIGEN)
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struct acpi_ops pinctrl_sandbox_acpi_ops = {
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.get_name = sb_pinctrl_get_name,
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};
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#endif
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static const struct udevice_id sandbox_pinctrl_gpio_match[] = {
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{ .compatible = "sandbox,pinctrl-gpio" },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(sandbox_pinctrl_gpio) = {
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.name = "sandbox_pinctrl_gpio",
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.id = UCLASS_PINCTRL,
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.of_match = sandbox_pinctrl_gpio_match,
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.ops = &sandbox_pinctrl_gpio_ops,
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.bind = dm_scan_fdt_dev,
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.probe = sandbox_pinctrl_probe,
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.priv_auto_alloc_size = sizeof(struct sb_pinctrl_priv),
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ACPI_OPS_PTR(&pinctrl_sandbox_acpi_ops)
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};
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