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gpio: tegra: use named constants

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In order to make it clear what the parameters to set_config() and
set_direction() mean, and similarly for the return values from the
respective get_*(), define named constants for these values.

Disassembly shows no diff in the generated code, except that the
order of the code in the branches of tegra_gpio_get_function() gets
modified without affecting behaviour.

Suggested-by: Tom Warren <twarren@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Stephen Warren 2015-09-25 10:44:08 -06:00 committed by Tom Warren
parent 9f75a222c7
commit fe82857c4b
1 changed files with 19 additions and 14 deletions
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33
drivers/gpio/tegra_gpio.c
View File

@ -1,6 +1,6 @@
/*
* NVIDIA Tegra20 GPIO handling.
* (C) Copyright 2010-2012
* (C) Copyright 2010-2012,2015
* NVIDIA Corporation <www.nvidia.com>
*
* SPDX-License-Identifier: GPL-2.0+
@ -25,6 +25,11 @@
DECLARE_GLOBAL_DATA_PTR;
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;
const char *port_name; /* Name of port, e.g. "B" */
@ -37,7 +42,7 @@ struct tegra_port_info {
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;
@ -46,15 +51,15 @@ static int get_config(unsigned gpio)
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;
@ -65,7 +70,7 @@ static void set_config(unsigned gpio, int type)
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));
@ -86,7 +91,7 @@ static int get_direction(unsigned 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' */
@ -100,7 +105,7 @@ static void set_direction(unsigned gpio, int 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));
@ -135,7 +140,7 @@ static int tegra_gpio_direction_input(struct udevice *dev, unsigned offset)
struct tegra_port_info *state = dev_get_priv(dev);
/* 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);
@ -154,7 +159,7 @@ static int tegra_gpio_direction_output(struct udevice *dev, unsigned offset,
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);
@ -199,18 +204,18 @@ void gpio_config_table(const struct tegra_gpio_config *config, int len)
for (i = 0; i < len; i++) {
switch (config[i].init) {
case TEGRA_GPIO_INIT_IN:
set_direction(config[i].gpio, 0);
set_direction(config[i].gpio, DIRECTION_INPUT);
break;
case TEGRA_GPIO_INIT_OUT0:
set_level(config[i].gpio, 0);
set_direction(config[i].gpio, 1);
set_direction(config[i].gpio, DIRECTION_OUTPUT);
break;
case TEGRA_GPIO_INIT_OUT1:
set_level(config[i].gpio, 1);
set_direction(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);
}
}