forked from Minki/linux
809f36c6f4
Add basic support for the Au1300 variant(s): - New GPIO/Interrupt controller - DBDMA ids - USB setup - MMC support - enable various PSC drivers - detection code. Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com> To: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/2866/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
/*
|
|
* 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_
|
|
|
|
#include <asm/mach-au1x00/au1000.h>
|
|
#include <asm/mach-au1x00/gpio-au1000.h>
|
|
#include <asm/mach-au1x00/gpio-au1300.h>
|
|
|
|
/* 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);
|
|
case ALCHEMY_CPU_AU1300:
|
|
return au1300_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_ */
|