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Diffstat (limited to 'arch/mips/include/asm/mach-au1x00/gpio.h')
-rw-r--r--arch/mips/include/asm/mach-au1x00/gpio.h82
1 files changed, 3 insertions, 79 deletions
diff --git a/arch/mips/include/asm/mach-au1x00/gpio.h b/arch/mips/include/asm/mach-au1x00/gpio.h
index 22e7ff17fc4..c3f60cdc320 100644
--- a/arch/mips/include/asm/mach-au1x00/gpio.h
+++ b/arch/mips/include/asm/mach-au1x00/gpio.h
@@ -1,86 +1,10 @@
1/*
2 * Alchemy GPIO support.
3 *
4 * With CONFIG_GPIOLIB=y different types of on-chip GPIO can be supported within
5 * the same kernel image.
6 * With CONFIG_GPIOLIB=n, your board must select ALCHEMY_GPIOINT_AU1XXX for the
7 * appropriate CPU type (AU1000 currently).
8 */
9
10#ifndef _ALCHEMY_GPIO_H_ 1#ifndef _ALCHEMY_GPIO_H_
11#define _ALCHEMY_GPIO_H_ 2#define _ALCHEMY_GPIO_H_
12 3
13#include <asm/mach-au1x00/au1000.h> 4#if defined(CONFIG_ALCHEMY_GPIOINT_AU1000)
14#include <asm/mach-au1x00/gpio-au1000.h>
15#include <asm/mach-au1x00/gpio-au1300.h>
16
17/* On Au1000, Au1500 and Au1100 GPIOs won't work as inputs before
18 * SYS_PININPUTEN is written to at least once. On Au1550/Au1200/Au1300 this
19 * register enables use of GPIOs as wake source.
20 */
21static inline void alchemy_gpio1_input_enable(void)
22{
23 void __iomem *base = (void __iomem *)KSEG1ADDR(AU1000_SYS_PHYS_ADDR);
24 __raw_writel(0, base + 0x110); /* the write op is key */
25 wmb();
26}
27
28
29/* Linux gpio framework integration.
30*
31* 4 use cases of Alchemy GPIOS:
32*(1) GPIOLIB=y, ALCHEMY_GPIO_INDIRECT=y:
33* Board must register gpiochips.
34*(2) GPIOLIB=y, ALCHEMY_GPIO_INDIRECT=n:
35* A gpiochip for the 75 GPIOs is registered.
36*
37*(3) GPIOLIB=n, ALCHEMY_GPIO_INDIRECT=y:
38* the boards' gpio.h must provide the linux gpio wrapper functions,
39*
40*(4) GPIOLIB=n, ALCHEMY_GPIO_INDIRECT=n:
41* inlinable gpio functions are provided which enable access to the
42* Au1300 gpios only by using the numbers straight out of the data-
43* sheets.
44
45* Cases 1 and 3 are intended for boards which want to provide their own
46* GPIO namespace and -operations (i.e. for example you have 8 GPIOs
47* which are in part provided by spare Au1300 GPIO pins and in part by
48* an external FPGA but you still want them to be accssible in linux
49* as gpio0-7. The board can of course use the alchemy_gpioX_* functions
50* as required).
51*/
52
53#ifdef CONFIG_GPIOLIB
54
55/* wraps the cpu-dependent irq_to_gpio functions */
56/* FIXME: gpiolib needs an irq_to_gpio hook */
57static inline int __au_irq_to_gpio(unsigned int irq)
58{
59 switch (alchemy_get_cputype()) {
60 case ALCHEMY_CPU_AU1000...ALCHEMY_CPU_AU1200:
61 return alchemy_irq_to_gpio(irq);
62 case ALCHEMY_CPU_AU1300:
63 return au1300_irq_to_gpio(irq);
64 }
65 return -EINVAL;
66}
67
68
69/* using gpiolib to provide up to 2 gpio_chips for on-chip gpios */
70#ifndef CONFIG_ALCHEMY_GPIO_INDIRECT /* case (2) */
71
72/* get everything through gpiolib */
73#define gpio_to_irq __gpio_to_irq
74#define gpio_get_value __gpio_get_value
75#define gpio_set_value __gpio_set_value
76#define gpio_cansleep __gpio_cansleep
77#define irq_to_gpio __au_irq_to_gpio
78
79#include <asm-generic/gpio.h>
80
81#endif /* !CONFIG_ALCHEMY_GPIO_INDIRECT */
82 5
6#include <asm/mach-au1x00/gpio-au1000.h>
83 7
84#endif /* CONFIG_GPIOLIB */ 8#endif
85 9
86#endif /* _ALCHEMY_GPIO_H_ */ 10#endif /* _ALCHEMY_GPIO_H_ */