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MIPS: Alchemy: support multiple GPIO styles in one kernel

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For GPIOLIB=y decide at runtime which gpiochips to register;
in the GPIOLIB=n case, the gpio headers need to be reshuffled
a bit to make multiple implementations coexist peacefully.

Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
To: Linux-MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/2679/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Manuel Lauss
2011-08-02 19:51:03 +02:00
committed by Ralf Baechle
parent 2e8fd2e5ef
commit ce1d43b9a9
4 changed files with 99 additions and 48 deletions
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31
arch/mips/include/asm/mach-au1x00/gpio-au1000.h
View File

@@ -347,17 +347,6 @@ static inline int alchemy_gpio2_to_irq(int gpio)
/**********************************************************************/
/* On Au1000, Au1500 and Au1100 GPIOs won't work as inputs before
* SYS_PININPUTEN is written to at least once. On Au1550/Au1200 this
* register enables use of GPIOs as wake source.
*/
static inline void alchemy_gpio1_input_enable(void)
{
void __iomem *base = (void __iomem *)KSEG1ADDR(AU1000_SYS_PHYS_ADDR);
__raw_writel(0, base + SYS_PININPUTEN); /* the write op is key */
wmb();
}
/* GPIO2 shared interrupts and control */
static inline void __alchemy_gpio2_mod_int(int gpio2, int en)
@@ -561,6 +550,7 @@ static inline int alchemy_irq_to_gpio(int irq)
#ifndef CONFIG_GPIOLIB
#ifdef CONFIG_ALCHEMY_GPIOINT_AU1000
#ifndef CONFIG_ALCHEMY_GPIO_INDIRECT /* case (4) */
@@ -665,24 +655,7 @@ static inline void gpio_unexport(unsigned gpio)
#endif /* !CONFIG_ALCHEMY_GPIO_INDIRECT */
#else /* CONFIG GPIOLIB */
/* using gpiolib to provide up to 2 gpio_chips for on-chip gpios */
#ifndef CONFIG_ALCHEMY_GPIO_INDIRECT /* case (2) */
/* get everything through gpiolib */
#define gpio_to_irq __gpio_to_irq
#define gpio_get_value __gpio_get_value
#define gpio_set_value __gpio_set_value
#define gpio_cansleep __gpio_cansleep
#define irq_to_gpio alchemy_irq_to_gpio
#include <asm-generic/gpio.h>
#endif /* !CONFIG_ALCHEMY_GPIO_INDIRECT */
#endif /* CONFIG_ALCHEMY_GPIOINT_AU1000 */
#endif /* !CONFIG_GPIOLIB */

79
arch/mips/include/asm/mach-au1x00/gpio.h
View File

@@ -1,10 +1,83 @@
/*
* Alchemy GPIO support.
*
* With CONFIG_GPIOLIB=y different types of on-chip GPIO can be supported within
* the same kernel image.
* With CONFIG_GPIOLIB=n, your board must select ALCHEMY_GPIOINT_AU1XXX for the
* appropriate CPU type (AU1000 currently).
*/
#ifndef _ALCHEMY_GPIO_H_
#define _ALCHEMY_GPIO_H_
#if defined(CONFIG_ALCHEMY_GPIOINT_AU1000)
#include <asm/mach-au1x00/au1000.h>
#include <asm/mach-au1x00/gpio-au1000.h>
#endif
/* On Au1000, Au1500 and Au1100 GPIOs won't work as inputs before
* SYS_PININPUTEN is written to at least once. On Au1550/Au1200/Au1300 this
* register enables use of GPIOs as wake source.
*/
static inline void alchemy_gpio1_input_enable(void)
{
void __iomem *base = (void __iomem *)KSEG1ADDR(AU1000_SYS_PHYS_ADDR);
__raw_writel(0, base + 0x110); /* the write op is key */
wmb();
}
/* 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).
*/
#ifdef CONFIG_GPIOLIB
/* wraps the cpu-dependent irq_to_gpio functions */
/* FIXME: gpiolib needs an irq_to_gpio hook */
static inline int __au_irq_to_gpio(unsigned int irq)
{
switch (alchemy_get_cputype()) {
case ALCHEMY_CPU_AU1000...ALCHEMY_CPU_AU1200:
return alchemy_irq_to_gpio(irq);
}
return -EINVAL;
}
/* using gpiolib to provide up to 2 gpio_chips for on-chip gpios */
#ifndef CONFIG_ALCHEMY_GPIO_INDIRECT /* case (2) */
/* get everything through gpiolib */
#define gpio_to_irq __gpio_to_irq
#define gpio_get_value __gpio_get_value
#define gpio_set_value __gpio_set_value
#define gpio_cansleep __gpio_cansleep
#define irq_to_gpio __au_irq_to_gpio
#include <asm-generic/gpio.h>
#endif /* !CONFIG_ALCHEMY_GPIO_INDIRECT */
#endif /* CONFIG_GPIOLIB */
#endif /* _ALCHEMY_GPIO_H_ */