+// SPDX-License-Identifier: GPL-2.0+
/*
* NVIDIA Tegra20 GPIO handling.
- * (C) Copyright 2010-2012
+ * (C) Copyright 2010-2012,2015
* NVIDIA Corporation <www.nvidia.com>
- *
- * SPDX-License-Identifier: GPL-2.0+
*/
/*
#include <common.h>
#include <dm.h>
+#include <log.h>
#include <malloc.h>
#include <errno.h>
#include <fdtdec.h>
#include <asm/arch/tegra.h>
#include <asm/gpio.h>
#include <dm/device-internal.h>
+#include <dt-bindings/gpio/gpio.h>
-DECLARE_GLOBAL_DATA_PTR;
-
-enum {
- TEGRA_CMD_INFO,
- TEGRA_CMD_PORT,
- TEGRA_CMD_OUTPUT,
- TEGRA_CMD_INPUT,
-};
+static const int CONFIG_SFIO = 0;
+static const int CONFIG_GPIO = 1;
+static const int DIRECTION_INPUT = 0;
+static const int DIRECTION_OUTPUT = 1;
struct tegra_gpio_platdata {
struct gpio_ctlr_bank *bank;
/* Information about each port at run-time */
struct tegra_port_info {
- char label[TEGRA_GPIOS_PER_PORT][GPIO_NAME_SIZE];
struct gpio_ctlr_bank *bank;
int base_gpio; /* Port number for this port (0, 1,.., n-1) */
};
-/* Return config of pin 'gpio' as GPIO (1) or SFPIO (0) */
+/* Return config of pin 'gpio' as GPIO (1) or SFIO (0) */
static int get_config(unsigned gpio)
{
struct gpio_ctlr *ctlr = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
int type;
u = readl(&bank->gpio_config[GPIO_PORT(gpio)]);
- type = (u >> GPIO_BIT(gpio)) & 1;
+ type = (u >> GPIO_BIT(gpio)) & 1;
debug("get_config: port = %d, bit = %d is %s\n",
GPIO_FULLPORT(gpio), GPIO_BIT(gpio), type ? "GPIO" : "SFPIO");
- return type;
+ return type ? CONFIG_GPIO : CONFIG_SFIO;
}
-/* Config pin 'gpio' as GPIO or SFPIO, based on 'type' */
+/* Config pin 'gpio' as GPIO or SFIO, based on 'type' */
static void set_config(unsigned gpio, int type)
{
struct gpio_ctlr *ctlr = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
GPIO_FULLPORT(gpio), GPIO_BIT(gpio), type ? "GPIO" : "SFPIO");
u = readl(&bank->gpio_config[GPIO_PORT(gpio)]);
- if (type) /* GPIO */
+ if (type != CONFIG_SFIO)
u |= 1 << GPIO_BIT(gpio);
else
u &= ~(1 << GPIO_BIT(gpio));
debug("get_direction: port = %d, bit = %d, %s\n",
GPIO_FULLPORT(gpio), GPIO_BIT(gpio), dir ? "OUT" : "IN");
- return dir;
+ return dir ? DIRECTION_OUTPUT : DIRECTION_INPUT;
}
/* Config GPIO pin 'gpio' as input or output (OE) as per 'output' */
GPIO_FULLPORT(gpio), GPIO_BIT(gpio), output ? "OUT" : "IN");
u = readl(&bank->gpio_dir_out[GPIO_PORT(gpio)]);
- if (output)
+ if (output != DIRECTION_INPUT)
u |= 1 << GPIO_BIT(gpio);
else
u &= ~(1 << GPIO_BIT(gpio));
writel(u, &bank->gpio_out[GPIO_PORT(gpio)]);
}
-static int check_reserved(struct udevice *dev, unsigned offset,
- const char *func)
-{
- struct tegra_port_info *state = dev_get_priv(dev);
- struct gpio_dev_priv *uc_priv = dev->uclass_priv;
-
- if (!*state->label[offset]) {
- printf("tegra_gpio: %s: error: gpio %s%d not reserved\n",
- func, uc_priv->bank_name, offset);
- return -EBUSY;
- }
-
- return 0;
-}
-
-/* set GPIO pin 'gpio' as an output, with polarity 'value' */
-int tegra_spl_gpio_direction_output(int gpio, int value)
-{
- /* Configure as a GPIO */
- set_config(gpio, 1);
-
- /* Configure GPIO output value. */
- set_level(gpio, value);
-
- /* Configure GPIO direction as output. */
- set_direction(gpio, 1);
-
- return 0;
-}
-
/*
* Generic_GPIO primitives.
*/
-static int tegra_gpio_request(struct udevice *dev, unsigned offset,
- const char *label)
-{
- struct tegra_port_info *state = dev_get_priv(dev);
-
- if (*state->label[offset])
- return -EBUSY;
-
- strncpy(state->label[offset], label, GPIO_NAME_SIZE);
- state->label[offset][GPIO_NAME_SIZE - 1] = '\0';
-
- /* Configure as a GPIO */
- set_config(state->base_gpio + offset, 1);
-
- return 0;
-}
-
-static int tegra_gpio_free(struct udevice *dev, unsigned offset)
-{
- struct tegra_port_info *state = dev_get_priv(dev);
- int ret;
-
- ret = check_reserved(dev, offset, __func__);
- if (ret)
- return ret;
- state->label[offset][0] = '\0';
-
- return 0;
-}
-
-/* read GPIO OUT value of pin 'gpio' */
-static int tegra_gpio_get_output_value(unsigned gpio)
-{
- struct gpio_ctlr *ctlr = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
- struct gpio_ctlr_bank *bank = &ctlr->gpio_bank[GPIO_BANK(gpio)];
- int val;
-
- debug("gpio_get_output_value: pin = %d (port %d:bit %d)\n",
- gpio, GPIO_FULLPORT(gpio), GPIO_BIT(gpio));
-
- val = readl(&bank->gpio_out[GPIO_PORT(gpio)]);
-
- return (val >> GPIO_BIT(gpio)) & 1;
-}
-
-
/* set GPIO pin 'gpio' as an input */
static int tegra_gpio_direction_input(struct udevice *dev, unsigned offset)
{
struct tegra_port_info *state = dev_get_priv(dev);
- int ret;
-
- ret = check_reserved(dev, offset, __func__);
- if (ret)
- return ret;
/* Configure GPIO direction as input. */
- set_direction(state->base_gpio + offset, 0);
+ set_direction(state->base_gpio + offset, DIRECTION_INPUT);
+
+ /* Enable the pin as a GPIO */
+ set_config(state->base_gpio + offset, 1);
return 0;
}
{
struct tegra_port_info *state = dev_get_priv(dev);
int gpio = state->base_gpio + offset;
- int ret;
-
- ret = check_reserved(dev, offset, __func__);
- if (ret)
- return ret;
/* Configure GPIO output value. */
set_level(gpio, value);
/* Configure GPIO direction as output. */
- set_direction(gpio, 1);
+ set_direction(gpio, DIRECTION_OUTPUT);
+
+ /* Enable the pin as a GPIO */
+ set_config(state->base_gpio + offset, 1);
return 0;
}
{
struct tegra_port_info *state = dev_get_priv(dev);
int gpio = state->base_gpio + offset;
- int ret;
int val;
- ret = check_reserved(dev, offset, __func__);
- if (ret)
- return ret;
-
debug("%s: pin = %d (port %d:bit %d)\n", __func__,
gpio, GPIO_FULLPORT(gpio), GPIO_BIT(gpio));
- val = readl(&state->bank->gpio_in[GPIO_PORT(gpio)]);
+ if (get_direction(gpio) == DIRECTION_INPUT)
+ val = readl(&state->bank->gpio_in[GPIO_PORT(gpio)]);
+ else
+ val = readl(&state->bank->gpio_out[GPIO_PORT(gpio)]);
return (val >> GPIO_BIT(gpio)) & 1;
}
{
struct tegra_port_info *state = dev_get_priv(dev);
int gpio = state->base_gpio + offset;
- int ret;
-
- ret = check_reserved(dev, offset, __func__);
- if (ret)
- return ret;
debug("gpio_set_value: pin = %d (port %d:bit %d), value = %d\n",
gpio, GPIO_FULLPORT(gpio), GPIO_BIT(gpio), value);
for (i = 0; i < len; i++) {
switch (config[i].init) {
case TEGRA_GPIO_INIT_IN:
- gpio_direction_input(config[i].gpio);
+ set_direction(config[i].gpio, DIRECTION_INPUT);
break;
case TEGRA_GPIO_INIT_OUT0:
- gpio_direction_output(config[i].gpio, 0);
+ set_level(config[i].gpio, 0);
+ set_direction(config[i].gpio, DIRECTION_OUTPUT);
break;
case TEGRA_GPIO_INIT_OUT1:
- gpio_direction_output(config[i].gpio, 1);
+ set_level(config[i].gpio, 1);
+ set_direction(config[i].gpio, DIRECTION_OUTPUT);
break;
}
- set_config(config[i].gpio, 1);
+ set_config(config[i].gpio, CONFIG_GPIO);
}
}
struct tegra_port_info *state = dev_get_priv(dev);
int gpio = state->base_gpio + offset;
- if (!*state->label[offset])
- return GPIOF_UNUSED;
if (!get_config(gpio))
return GPIOF_FUNC;
else if (get_direction(gpio))
return GPIOF_INPUT;
}
-static int tegra_gpio_get_state(struct udevice *dev, unsigned int offset,
- char *buf, int bufsize)
+static int tegra_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
+ struct ofnode_phandle_args *args)
{
- struct gpio_dev_priv *uc_priv = dev->uclass_priv;
- struct tegra_port_info *state = dev_get_priv(dev);
- int gpio = state->base_gpio + offset;
- const char *label;
- int is_output;
- int is_gpio;
- int size;
-
- label = state->label[offset];
- is_gpio = get_config(gpio); /* GPIO, not SFPIO */
- size = snprintf(buf, bufsize, "%s%d: ",
- uc_priv->bank_name ? uc_priv->bank_name : "", offset);
- buf += size;
- bufsize -= size;
- if (is_gpio) {
- is_output = get_direction(gpio);
-
- snprintf(buf, bufsize, "%s: %d [%c]%s%s",
- is_output ? "out" : " in",
- is_output ?
- tegra_gpio_get_output_value(gpio) :
- tegra_gpio_get_value(dev, offset),
- *label ? 'x' : ' ',
- *label ? " " : "",
- label);
- } else {
- snprintf(buf, bufsize, "sfpio");
- }
+ int gpio, port, ret;
+
+ gpio = args->args[0];
+ port = gpio / TEGRA_GPIOS_PER_PORT;
+ ret = device_get_child(dev, port, &desc->dev);
+ if (ret)
+ return ret;
+ desc->offset = gpio % TEGRA_GPIOS_PER_PORT;
+ desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;
return 0;
}
static const struct dm_gpio_ops gpio_tegra_ops = {
- .request = tegra_gpio_request,
- .free = tegra_gpio_free,
.direction_input = tegra_gpio_direction_input,
.direction_output = tegra_gpio_direction_output,
.get_value = tegra_gpio_get_value,
.set_value = tegra_gpio_set_value,
.get_function = tegra_gpio_get_function,
- .get_state = tegra_gpio_get_state,
+ .xlate = tegra_gpio_xlate,
};
/**
static int gpio_tegra_probe(struct udevice *dev)
{
- struct gpio_dev_priv *uc_priv = dev->uclass_priv;
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct tegra_port_info *priv = dev->priv;
struct tegra_gpio_platdata *plat = dev->platdata;
int bank_count;
int bank;
int ret;
- int len;
/* If this is a child device, there is nothing to do here */
if (plat)
return 0;
+ /* TODO(sjg@chromium.org): Remove once SPL supports device tree */
+#ifdef CONFIG_SPL_BUILD
+ ctlr = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
+ bank_count = TEGRA_GPIO_BANKS;
+#else
+ {
+ int len;
+
/*
* This driver does not make use of interrupts, other than to figure
* out the number of GPIO banks
*/
- if (!fdt_getprop(gd->fdt_blob, parent->of_offset, "interrupts", &len))
- return -EINVAL;
+ len = dev_read_size(parent, "interrupts");
+ if (len < 0)
+ return len;
bank_count = len / 3 / sizeof(u32);
- ctlr = (struct gpio_ctlr *)fdtdec_get_addr(gd->fdt_blob,
- parent->of_offset, "reg");
+ ctlr = (struct gpio_ctlr *)dev_read_addr(parent);
+ if ((ulong)ctlr == FDT_ADDR_T_NONE)
+ return -EINVAL;
+ }
+#endif
for (bank = 0; bank < bank_count; bank++) {
int port;
plat->port_name, plat, -1, &dev);
if (ret)
return ret;
- dev->of_offset = parent->of_offset;
+ dev_set_of_offset(dev, dev_of_offset(parent));
}
}
projects / oweals / u-boot.git / blobdiff