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/* SPDX-License-Identifier: GPL-2.0 */
/*
* gpio-au1300.h -- GPIO control for Au1300 GPIC and compatibles.
*
* Copyright (c) 2009-2011 Manuel Lauss <manuel.lauss@googlemail.com>
*/
#ifndef _GPIO_AU1300_H_
#define _GPIO_AU1300_H_
#include <asm/addrspace.h>
#include <asm/io.h>
#include <asm/mach-au1x00/au1000.h>
struct gpio;
struct gpio_chip;
/* with the current GPIC design, up to 128 GPIOs are possible.
* The only implementation so far is in the Au1300, which has 75 externally
* available GPIOs.
*/
#define AU1300_GPIO_BASE 0
#define AU1300_GPIO_NUM 75
#define AU1300_GPIO_MAX (AU1300_GPIO_BASE + AU1300_GPIO_NUM - 1)
#define AU1300_GPIC_ADDR \
(void __iomem *)KSEG1ADDR(AU1300_GPIC_PHYS_ADDR)
static inline int au1300_gpio_get_value(unsigned int gpio)
{
void __iomem *roff = AU1300_GPIC_ADDR;
int bit;
gpio -= AU1300_GPIO_BASE;
roff += GPIC_GPIO_BANKOFF(gpio);
bit = GPIC_GPIO_TO_BIT(gpio);
return __raw_readl(roff + AU1300_GPIC_PINVAL) & bit;
}
static inline int au1300_gpio_direction_input(unsigned int gpio)
{
void __iomem *roff = AU1300_GPIC_ADDR;
unsigned long bit;
gpio -= AU1300_GPIO_BASE;
roff += GPIC_GPIO_BANKOFF(gpio);
bit = GPIC_GPIO_TO_BIT(gpio);
__raw_writel(bit, roff + AU1300_GPIC_DEVCLR);
wmb();
return 0;
}
static inline int au1300_gpio_set_value(unsigned int gpio, int v)
{
void __iomem *roff = AU1300_GPIC_ADDR;
unsigned long bit;
gpio -= AU1300_GPIO_BASE;
roff += GPIC_GPIO_BANKOFF(gpio);
bit = GPIC_GPIO_TO_BIT(gpio);
__raw_writel(bit, roff + (v ? AU1300_GPIC_PINVAL
: AU1300_GPIC_PINVALCLR));
wmb();
return 0;
}
static inline int au1300_gpio_direction_output(unsigned int gpio, int v)
{
/* hw switches to output automatically */
return au1300_gpio_set_value(gpio, v);
}
static inline int au1300_gpio_to_irq(unsigned int gpio)
{
return AU1300_FIRST_INT + (gpio - AU1300_GPIO_BASE);
}
static inline int au1300_irq_to_gpio(unsigned int irq)
{
return (irq - AU1300_FIRST_INT) + AU1300_GPIO_BASE;
}
static inline int au1300_gpio_is_valid(unsigned int gpio)
{
int ret;
switch (alchemy_get_cputype()) {
case ALCHEMY_CPU_AU1300:
ret = ((gpio >= AU1300_GPIO_BASE) && (gpio <= AU1300_GPIO_MAX));
break;
default:
ret = 0;
}
return ret;
}
/* hardware remembers gpio 0-63 levels on powerup */
static inline int au1300_gpio_getinitlvl(unsigned int gpio)
{
void __iomem *roff = AU1300_GPIC_ADDR;
unsigned long v;
if (unlikely(gpio > 63))
return 0;
else if (gpio > 31) {
gpio -= 32;
roff += 4;
}
v = __raw_readl(roff + AU1300_GPIC_RSTVAL);
return (v >> gpio) & 1;
}
#endif /* _GPIO_AU1300_H_ */
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