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/*
* 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>
/* 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;
}
static inline int au1300_gpio_cansleep(unsigned int gpio)
{
return 0;
}
/* 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;
}
/**********************************************************************/
/* Linux gpio framework integration.
*
* 4 use cases of Alchemy GPIOS:
*(1) GPIOLIB=y, ALCHEMY_GPIO_INDIRECT=y:
* Board must register gpiochips.
*(2) GPIOLIB=y, ALCHEMY_GPIO_INDIRECT=n:
* A gpiochip for the 75 GPIOs is registered.
*
*(3) GPIOLIB=n, ALCHEMY_GPIO_INDIRECT=y:
* the boards' gpio.h must provide the linux gpio wrapper functions,
*
*(4) GPIOLIB=n, ALCHEMY_GPIO_INDIRECT=n:
* inlinable gpio functions are provided which enable access to the
* Au1300 gpios only by using the numbers straight out of the data-
* sheets.
* Cases 1 and 3 are intended for boards which want to provide their own
* GPIO namespace and -operations (i.e. for example you have 8 GPIOs
* which are in part provided by spare Au1300 GPIO pins and in part by
* an external FPGA but you still want them to be accssible in linux
* as gpio0-7. The board can of course use the alchemy_gpioX_* functions
* as required).
*/
#ifndef CONFIG_GPIOLIB
#ifdef CONFIG_ALCHEMY_GPIOINT_AU1300
#ifndef CONFIG_ALCHEMY_GPIO_INDIRECT /* case (4) */
static inline int gpio_direction_input(unsigned int gpio)
{
return au1300_gpio_direction_input(gpio);
}
static inline int gpio_direction_output(unsigned int gpio, int v)
{
return au1300_gpio_direction_output(gpio, v);
}
static inline int gpio_get_value(unsigned int gpio)
{
return au1300_gpio_get_value(gpio);
}
static inline void gpio_set_value(unsigned int gpio, int v)
{
au1300_gpio_set_value(gpio, v);
}
static inline int gpio_get_value_cansleep(unsigned gpio)
{
return gpio_get_value(gpio);
}
static inline void gpio_set_value_cansleep(unsigned gpio, int value)
{
gpio_set_value(gpio, value);
}
static inline int gpio_is_valid(unsigned int gpio)
{
return au1300_gpio_is_valid(gpio);
}
static inline int gpio_cansleep(unsigned int gpio)
{
return au1300_gpio_cansleep(gpio);
}
static inline int gpio_to_irq(unsigned int gpio)
{
return au1300_gpio_to_irq(gpio);
}
static inline int irq_to_gpio(unsigned int irq)
{
return au1300_irq_to_gpio(irq);
}
static inline int gpio_request(unsigned int gpio, const char *label)
{
return 0;
}
static inline void gpio_free(unsigned int gpio)
{
}
static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
{
return -ENOSYS;
}
static inline void gpio_unexport(unsigned gpio)
{
}
static inline int gpio_export(unsigned gpio, bool direction_may_change)
{
return -ENOSYS;
}
static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
{
return -ENOSYS;
}
static inline int gpio_export_link(struct device *dev, const char *name,
unsigned gpio)
{
return -ENOSYS;
}
#endif /* !CONFIG_ALCHEMY_GPIO_INDIRECT */
#endif /* CONFIG_ALCHEMY_GPIOINT_AU1300 */
#endif /* CONFIG GPIOLIB */
#endif /* _GPIO_AU1300_H_ */
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