115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0+ */
|
||
|
|
/*
|
||
|
|
* Copyright 2010 eXMeritus, A Boeing Company
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef POWERPC_ASM_MPC85XX_GPIO_H_
|
||
|
|
#define POWERPC_ASM_MPC85XX_GPIO_H_
|
||
|
|
|
||
|
|
# include <asm/immap_85xx.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The following internal functions are an MPC85XX-specific GPIO API which
|
||
|
|
* allows setting and querying multiple GPIOs in a single operation.
|
||
|
|
*
|
||
|
|
* All of these look relatively large, but the arguments are almost always
|
||
|
|
* constants, so they compile down to just a few instructions and a
|
||
|
|
* memory-mapped IO operation or two.
|
||
|
|
*/
|
||
|
|
static inline void mpc85xx_gpio_set(unsigned int mask,
|
||
|
|
unsigned int dir, unsigned int val)
|
||
|
|
{
|
||
|
|
ccsr_gpio_t *gpio = (void *)(CONFIG_SYS_MPC85xx_GPIO_ADDR);
|
||
|
|
|
||
|
|
/* First mask off the unwanted parts of "dir" and "val" */
|
||
|
|
dir &= mask;
|
||
|
|
val &= mask;
|
||
|
|
|
||
|
|
/* Now read in the values we're supposed to preserve */
|
||
|
|
dir |= (in_be32(&gpio->gpdir) & ~mask);
|
||
|
|
val |= (in_be32(&gpio->gpdat) & ~mask);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Poke the new output values first, then set the direction. This
|
||
|
|
* helps to avoid transient data when switching from input to output
|
||
|
|
* and vice versa.
|
||
|
|
*/
|
||
|
|
out_be32(&gpio->gpdat, val);
|
||
|
|
out_be32(&gpio->gpdir, dir);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void mpc85xx_gpio_set_in(unsigned int gpios)
|
||
|
|
{
|
||
|
|
mpc85xx_gpio_set(gpios, 0x00000000, 0x00000000);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void mpc85xx_gpio_set_low(unsigned int gpios)
|
||
|
|
{
|
||
|
|
mpc85xx_gpio_set(gpios, 0xFFFFFFFF, 0x00000000);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void mpc85xx_gpio_set_high(unsigned int gpios)
|
||
|
|
{
|
||
|
|
mpc85xx_gpio_set(gpios, 0xFFFFFFFF, 0xFFFFFFFF);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline unsigned int mpc85xx_gpio_get(unsigned int mask)
|
||
|
|
{
|
||
|
|
ccsr_gpio_t *gpio = (void *)(CONFIG_SYS_MPC85xx_GPIO_ADDR);
|
||
|
|
|
||
|
|
/* Read the requested values */
|
||
|
|
return in_be32(&gpio->gpdat) & mask;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* These implement the generic Linux GPIO API on top of the other functions
|
||
|
|
* in this header.
|
||
|
|
*/
|
||
|
|
static inline int gpio_request(unsigned gpio, const char *label)
|
||
|
|
{
|
||
|
|
/* Compatibility shim */
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int gpio_free(unsigned gpio)
|
||
|
|
{
|
||
|
|
/* Compatibility shim */
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int gpio_direction_input(unsigned gpio)
|
||
|
|
{
|
||
|
|
mpc85xx_gpio_set_in(1U << gpio);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int gpio_direction_output(unsigned gpio, int value)
|
||
|
|
{
|
||
|
|
if (value)
|
||
|
|
mpc85xx_gpio_set_high(1U << gpio);
|
||
|
|
else
|
||
|
|
mpc85xx_gpio_set_low(1U << gpio);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int gpio_get_value(unsigned gpio)
|
||
|
|
{
|
||
|
|
return !!mpc85xx_gpio_get(1U << gpio);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int gpio_set_value(unsigned gpio, int value)
|
||
|
|
{
|
||
|
|
if (value)
|
||
|
|
mpc85xx_gpio_set_high(1U << gpio);
|
||
|
|
else
|
||
|
|
mpc85xx_gpio_set_low(1U << gpio);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int gpio_is_valid(int gpio)
|
||
|
|
{
|
||
|
|
return (gpio >= 0) && (gpio < 32);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* not POWERPC_ASM_MPC85XX_GPIO_H_ */
|