1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | u32 scx200_gpio_configure(unsigned index, u32 set, u32 clear); |
3 | |
4 | extern unsigned scx200_gpio_base; |
5 | extern unsigned long scx200_gpio_shadow[2]; |
6 | extern struct nsc_gpio_ops scx200_gpio_ops; |
7 | |
8 | #define scx200_gpio_present() (scx200_gpio_base!=0) |
9 | |
10 | /* Definitions to make sure I do the same thing in all functions */ |
11 | #define __SCx200_GPIO_BANK unsigned bank = index>>5 |
12 | #define __SCx200_GPIO_IOADDR unsigned short ioaddr = scx200_gpio_base+0x10*bank |
13 | #define __SCx200_GPIO_SHADOW unsigned long *shadow = scx200_gpio_shadow+bank |
14 | #define __SCx200_GPIO_INDEX index &= 31 |
15 | |
16 | #define __SCx200_GPIO_OUT __asm__ __volatile__("outsl":"=mS" (shadow):"d" (ioaddr), "0" (shadow)) |
17 | |
18 | /* returns the value of the GPIO pin */ |
19 | |
20 | static inline int scx200_gpio_get(unsigned index) { |
21 | __SCx200_GPIO_BANK; |
22 | __SCx200_GPIO_IOADDR + 0x04; |
23 | __SCx200_GPIO_INDEX; |
24 | |
25 | return (inl(port: ioaddr) & (1<<index)) ? 1 : 0; |
26 | } |
27 | |
28 | /* return the value driven on the GPIO signal (the value that will be |
29 | driven if the GPIO is configured as an output, it might not be the |
30 | state of the GPIO right now if the GPIO is configured as an input) */ |
31 | |
32 | static inline int scx200_gpio_current(unsigned index) { |
33 | __SCx200_GPIO_BANK; |
34 | __SCx200_GPIO_INDEX; |
35 | |
36 | return (scx200_gpio_shadow[bank] & (1<<index)) ? 1 : 0; |
37 | } |
38 | |
39 | /* drive the GPIO signal high */ |
40 | |
41 | static inline void scx200_gpio_set_high(unsigned index) { |
42 | __SCx200_GPIO_BANK; |
43 | __SCx200_GPIO_IOADDR; |
44 | __SCx200_GPIO_SHADOW; |
45 | __SCx200_GPIO_INDEX; |
46 | set_bit(nr: index, addr: shadow); /* __set_bit()? */ |
47 | __SCx200_GPIO_OUT; |
48 | } |
49 | |
50 | /* drive the GPIO signal low */ |
51 | |
52 | static inline void scx200_gpio_set_low(unsigned index) { |
53 | __SCx200_GPIO_BANK; |
54 | __SCx200_GPIO_IOADDR; |
55 | __SCx200_GPIO_SHADOW; |
56 | __SCx200_GPIO_INDEX; |
57 | clear_bit(nr: index, addr: shadow); /* __clear_bit()? */ |
58 | __SCx200_GPIO_OUT; |
59 | } |
60 | |
61 | /* drive the GPIO signal to state */ |
62 | |
63 | static inline void scx200_gpio_set(unsigned index, int state) { |
64 | __SCx200_GPIO_BANK; |
65 | __SCx200_GPIO_IOADDR; |
66 | __SCx200_GPIO_SHADOW; |
67 | __SCx200_GPIO_INDEX; |
68 | if (state) |
69 | set_bit(nr: index, addr: shadow); |
70 | else |
71 | clear_bit(nr: index, addr: shadow); |
72 | __SCx200_GPIO_OUT; |
73 | } |
74 | |
75 | /* toggle the GPIO signal */ |
76 | static inline void scx200_gpio_change(unsigned index) { |
77 | __SCx200_GPIO_BANK; |
78 | __SCx200_GPIO_IOADDR; |
79 | __SCx200_GPIO_SHADOW; |
80 | __SCx200_GPIO_INDEX; |
81 | change_bit(nr: index, addr: shadow); |
82 | __SCx200_GPIO_OUT; |
83 | } |
84 | |
85 | #undef __SCx200_GPIO_BANK |
86 | #undef __SCx200_GPIO_IOADDR |
87 | #undef __SCx200_GPIO_SHADOW |
88 | #undef __SCx200_GPIO_INDEX |
89 | #undef __SCx200_GPIO_OUT |
90 | |