mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 02:51:00 +00:00
f6f681642f
This allows to test if a pin's label if displayed using gpio_get_status() when this pin is configured in alternate function. Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
592 lines
14 KiB
C
592 lines
14 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-internal.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 flags; /* flags (GPIOD_...) */
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};
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/* Access routines for GPIO info */
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static struct gpio_state *get_gpio_state(struct udevice *dev, uint 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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printf("sandbox_gpio: error: invalid gpio %u\n", offset);
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return NULL;
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}
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return &state[offset];
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}
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/* Access routines for GPIO flags */
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static ulong *get_gpio_flags(struct udevice *dev, unsigned int offset)
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{
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struct gpio_state *state = get_gpio_state(dev, offset);
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if (!state)
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return NULL;
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return &state->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_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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struct gpio_state *state = get_gpio_state(dev, offset);
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if (value)
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state->flags |= flag;
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else
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state->flags &= ~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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struct gpio_state *state = get_gpio_state(dev, offset);
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bool val;
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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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if (state->flags & GPIOD_EXT_DRIVEN) {
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val = state->flags & GPIOD_EXT_HIGH;
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} else {
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if (state->flags & GPIOD_EXT_PULL_UP)
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val = true;
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else if (state->flags & GPIOD_EXT_PULL_DOWN)
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val = false;
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else
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val = state->flags & GPIOD_PULL_UP;
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}
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return val;
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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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set_gpio_flag(dev, offset, GPIOD_EXT_DRIVEN | GPIOD_EXT_HIGH, value);
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return 0;
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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_flags(struct udevice *dev, uint offset)
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{
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ulong flags = *get_gpio_flags(dev, offset);
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return flags & ~GPIOD_SANDBOX_MASK;
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}
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int sandbox_gpio_set_flags(struct udevice *dev, uint offset, ulong flags)
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{
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struct gpio_state *state = get_gpio_state(dev, offset);
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state->flags = 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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int ret;
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debug("%s: offset:%u, value = %d\n", __func__, offset, value);
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ret = sandbox_gpio_set_direction(dev, offset, 1);
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if (ret)
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return ret;
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ret = set_gpio_flag(dev, offset, GPIOD_IS_OUT_ACTIVE |
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GPIOD_EXT_DRIVEN | GPIOD_EXT_HIGH, value);
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if (ret)
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return ret;
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return 0;
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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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int ret;
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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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ret = set_gpio_flag(dev, offset, GPIOD_IS_OUT_ACTIVE |
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GPIOD_EXT_DRIVEN | GPIOD_EXT_HIGH, value);
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if (ret)
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return ret;
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return 0;
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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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if (get_gpio_flag(dev, offset, GPIOD_IS_AF))
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return GPIOF_FUNC;
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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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if (args->args[1] & GPIO_AF)
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desc->flags |= GPIOD_IS_AF;
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return 0;
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}
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static int sb_gpio_set_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, flags = %lx\n", __func__, offset, flags);
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struct gpio_state *state = get_gpio_state(dev, offset);
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if (flags & GPIOD_IS_OUT) {
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flags |= GPIOD_EXT_DRIVEN;
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if (flags & GPIOD_IS_OUT_ACTIVE)
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flags |= GPIOD_EXT_HIGH;
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else
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flags &= ~GPIOD_EXT_HIGH;
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} else {
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flags |= state->flags & GPIOD_SANDBOX_MASK;
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}
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state->flags = flags;
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return 0;
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}
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static int sb_gpio_get_flags(struct udevice *dev, uint offset, ulong *flagsp)
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{
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debug("%s: offset:%u\n", __func__, offset);
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*flagsp = *get_gpio_flags(dev, offset) & ~GPIOD_SANDBOX_MASK;
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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_flags = sb_gpio_set_flags,
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.get_flags = sb_gpio_get_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_of_to_plat(struct udevice *dev)
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{
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if (CONFIG_IS_ENABLED(OF_REAL)) {
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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uc_priv->gpio_count =
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dev_read_u32_default(dev, "sandbox,gpio-count", 0);
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uc_priv->bank_name = dev_read_string(dev, "gpio-bank-name");
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}
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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_has_ofnode(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_set_priv(dev,
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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_get_priv(dev));
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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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.of_to_plat = sandbox_gpio_of_to_plat,
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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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DM_DRIVER_ALIAS(sandbox_gpio, sandbox_gpio_alias)
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#if CONFIG_IS_ENABLED(PINCTRL)
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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_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)
|
|
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 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);
|
|
flags = *get_gpio_flags(gpio_dev, gpio_idx);
|
|
|
|
snprintf(buf, size, "gpio %s %s",
|
|
function == GPIOF_OUTPUT ? "output" : "input",
|
|
get_flags_string(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 = sizeof(struct sb_pinctrl_priv),
|
|
ACPI_OPS_PTR(&pinctrl_sandbox_acpi_ops)
|
|
};
|
|
|
|
#endif /* PINCTRL */
|