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07d6cb9378
The gpio block is part of the sl28cpld sl28cpld management controller. There are three different flavors: the usual input and output where the direction is configurable, but also input only and output only variants. Signed-off-by: Michael Walle <michael@walle.cc> [Rebased] Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
166 lines
3.4 KiB
C
166 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* GPIO driver for the sl28cpld
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*
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* Copyright (c) 2021 Michael Walle <michael@walle.cc>
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*/
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#include <common.h>
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#include <dm.h>
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#include <asm/gpio.h>
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#include <sl28cpld.h>
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/* GPIO flavor */
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#define SL28CPLD_GPIO_DIR 0x00
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#define SL28CPLD_GPIO_OUT 0x01
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#define SL28CPLD_GPIO_IN 0x02
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/* input-only flavor */
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#define SL28CPLD_GPI_IN 0x00
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/* output-only flavor */
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#define SL28CPLD_GPO_OUT 0x00
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enum {
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SL28CPLD_GPIO,
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SL28CPLD_GPI,
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SL28CPLD_GPO,
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};
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static int sl28cpld_gpio_get_value(struct udevice *dev, unsigned int gpio)
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{
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ulong type = dev_get_driver_data(dev);
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int val, reg;
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switch (type) {
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case SL28CPLD_GPIO:
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reg = SL28CPLD_GPIO_IN;
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break;
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case SL28CPLD_GPI:
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reg = SL28CPLD_GPI_IN;
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break;
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case SL28CPLD_GPO:
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/* we are output only, thus just return the output value */
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reg = SL28CPLD_GPO_OUT;
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break;
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default:
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return -EINVAL;
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}
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val = sl28cpld_read(dev, reg);
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return val < 0 ? val : !!(val & BIT(gpio));
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}
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static int sl28cpld_gpio_set_value(struct udevice *dev, unsigned int gpio,
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int value)
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{
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ulong type = dev_get_driver_data(dev);
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uint reg;
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switch (type) {
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case SL28CPLD_GPIO:
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reg = SL28CPLD_GPIO_OUT;
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break;
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case SL28CPLD_GPO:
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reg = SL28CPLD_GPO_OUT;
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break;
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case SL28CPLD_GPI:
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default:
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return -EINVAL;
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}
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if (value)
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return sl28cpld_update(dev, reg, 0, BIT(gpio));
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else
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return sl28cpld_update(dev, reg, BIT(gpio), 0);
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}
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static int sl28cpld_gpio_direction_input(struct udevice *dev, unsigned int gpio)
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{
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ulong type = dev_get_driver_data(dev);
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switch (type) {
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case SL28CPLD_GPI:
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return 0;
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case SL28CPLD_GPIO:
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return sl28cpld_update(dev, SL28CPLD_GPIO_DIR, BIT(gpio), 0);
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case SL28CPLD_GPO:
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default:
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return -EINVAL;
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}
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}
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static int sl28cpld_gpio_direction_output(struct udevice *dev,
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unsigned int gpio, int value)
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{
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ulong type = dev_get_driver_data(dev);
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int ret;
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/* set_value() will report an error if we are input-only */
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ret = sl28cpld_gpio_set_value(dev, gpio, value);
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if (ret)
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return ret;
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if (type == SL28CPLD_GPIO)
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return sl28cpld_update(dev, SL28CPLD_GPIO_DIR, 0, BIT(gpio));
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return 0;
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}
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static int sl28cpld_gpio_get_function(struct udevice *dev, unsigned int gpio)
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{
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ulong type = dev_get_driver_data(dev);
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int val;
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switch (type) {
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case SL28CPLD_GPIO:
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val = sl28cpld_read(dev, SL28CPLD_GPIO_DIR);
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if (val < 0)
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return val;
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if (val & BIT(gpio))
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return GPIOF_OUTPUT;
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else
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return GPIOF_INPUT;
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case SL28CPLD_GPI:
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return GPIOF_INPUT;
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case SL28CPLD_GPO:
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return GPIOF_OUTPUT;
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default:
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return -EINVAL;
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}
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}
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static const struct dm_gpio_ops sl28cpld_gpio_ops = {
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.direction_input = sl28cpld_gpio_direction_input,
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.direction_output = sl28cpld_gpio_direction_output,
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.get_value = sl28cpld_gpio_get_value,
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.set_value = sl28cpld_gpio_set_value,
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.get_function = sl28cpld_gpio_get_function,
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};
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static int sl28cpld_gpio_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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uc_priv->gpio_count = 8;
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uc_priv->bank_name = dev_read_name(dev);
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return 0;
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}
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static const struct udevice_id sl28cpld_gpio_ids[] = {
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{ .compatible = "kontron,sl28cpld-gpio", .data = SL28CPLD_GPIO},
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{ .compatible = "kontron,sl28cpld-gpo", .data = SL28CPLD_GPO},
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{ .compatible = "kontron,sl28cpld-gpi", .data = SL28CPLD_GPI},
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{ }
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};
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U_BOOT_DRIVER(sl28cpld_gpio) = {
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.name = "sl28cpld_gpio",
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.id = UCLASS_GPIO,
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.of_match = sl28cpld_gpio_ids,
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.probe = sl28cpld_gpio_probe,
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.ops = &sl28cpld_gpio_ops,
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};
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