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1da177e4 LT |
1 | /* |
2 | * linux/arch/h8300/kernel/gpio.c | |
3 | * | |
4 | * Yoshinori Sato <ysato@users.sourceforge.jp> | |
5 | * | |
6 | */ | |
7 | ||
8 | /* | |
9 | * Internal I/O Port Management | |
10 | */ | |
11 | ||
1da177e4 LT |
12 | #include <linux/stddef.h> |
13 | #include <linux/proc_fs.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/string.h> | |
16 | #include <linux/fs.h> | |
17 | #include <linux/init.h> | |
18 | ||
19 | #define _(addr) (volatile unsigned char *)(addr) | |
20 | #if defined(CONFIG_H83007) || defined(CONFIG_H83068) | |
21 | #include <asm/regs306x.h> | |
22 | static volatile unsigned char *ddrs[] = { | |
23 | _(P1DDR),_(P2DDR),_(P3DDR),_(P4DDR),_(P5DDR),_(P6DDR), | |
24 | NULL, _(P8DDR),_(P9DDR),_(PADDR),_(PBDDR), | |
25 | }; | |
26 | #define MAX_PORT 11 | |
27 | #endif | |
28 | ||
29 | #if defined(CONFIG_H83002) || defined(CONFIG_H8048) | |
30 | /* Fix me!! */ | |
31 | #include <asm/regs306x.h> | |
32 | static volatile unsigned char *ddrs[] = { | |
33 | _(P1DDR),_(P2DDR),_(P3DDR),_(P4DDR),_(P5DDR),_(P6DDR), | |
34 | NULL, _(P8DDR),_(P9DDR),_(PADDR),_(PBDDR), | |
35 | }; | |
36 | #define MAX_PORT 11 | |
37 | #endif | |
38 | ||
39 | #if defined(CONFIG_H8S2678) | |
40 | #include <asm/regs267x.h> | |
41 | static volatile unsigned char *ddrs[] = { | |
42 | _(P1DDR),_(P2DDR),_(P3DDR),NULL ,_(P5DDR),_(P6DDR), | |
43 | _(P7DDR),_(P8DDR),NULL, _(PADDR),_(PBDDR),_(PCDDR), | |
44 | _(PDDDR),_(PEDDR),_(PFDDR),_(PGDDR),_(PHDDR), | |
45 | _(PADDR),_(PBDDR),_(PCDDR),_(PDDDR),_(PEDDR),_(PFDDR), | |
46 | _(PGDDR),_(PHDDR) | |
47 | }; | |
48 | #define MAX_PORT 17 | |
49 | #endif | |
50 | #undef _ | |
51 | ||
52 | #if !defined(P1DDR) | |
53 | #error Unsuppoted CPU Selection | |
54 | #endif | |
55 | ||
56 | static struct { | |
57 | unsigned char used; | |
58 | unsigned char ddr; | |
59 | } gpio_regs[MAX_PORT]; | |
60 | ||
61 | extern char *_platform_gpio_table(int length); | |
62 | ||
63 | int h8300_reserved_gpio(int port, unsigned int bits) | |
64 | { | |
65 | unsigned char *used; | |
66 | ||
67 | if (port < 0 || port >= MAX_PORT) | |
68 | return -1; | |
69 | used = &(gpio_regs[port].used); | |
70 | if ((*used & bits) != 0) | |
71 | return 0; | |
72 | *used |= bits; | |
73 | return 1; | |
74 | } | |
75 | ||
76 | int h8300_free_gpio(int port, unsigned int bits) | |
77 | { | |
78 | unsigned char *used; | |
79 | ||
80 | if (port < 0 || port >= MAX_PORT) | |
81 | return -1; | |
82 | used = &(gpio_regs[port].used); | |
83 | if ((*used & bits) != bits) | |
84 | return 0; | |
85 | *used &= (~bits); | |
86 | return 1; | |
87 | } | |
88 | ||
89 | int h8300_set_gpio_dir(int port_bit,int dir) | |
90 | { | |
91 | int port = (port_bit >> 8) & 0xff; | |
92 | int bit = port_bit & 0xff; | |
93 | ||
94 | if (ddrs[port] == NULL) | |
95 | return 0; | |
96 | if (gpio_regs[port].used & bit) { | |
97 | if (dir) | |
98 | gpio_regs[port].ddr |= bit; | |
99 | else | |
100 | gpio_regs[port].ddr &= ~bit; | |
101 | *ddrs[port] = gpio_regs[port].ddr; | |
102 | return 1; | |
103 | } else | |
104 | return 0; | |
105 | } | |
106 | ||
107 | int h8300_get_gpio_dir(int port_bit) | |
108 | { | |
109 | int port = (port_bit >> 8) & 0xff; | |
110 | int bit = port_bit & 0xff; | |
111 | ||
112 | if (ddrs[port] == NULL) | |
113 | return 0; | |
114 | if (gpio_regs[port].used & bit) { | |
115 | return (gpio_regs[port].ddr & bit) != 0; | |
116 | } else | |
117 | return -1; | |
118 | } | |
119 | ||
120 | #if defined(CONFIG_PROC_FS) | |
121 | static char *port_status(int portno) | |
122 | { | |
123 | static char result[10]; | |
3c6bee1d | 124 | static const char io[2]={'I','O'}; |
1da177e4 LT |
125 | char *rp; |
126 | int c; | |
127 | unsigned char used,ddr; | |
128 | ||
129 | used = gpio_regs[portno].used; | |
130 | ddr = gpio_regs[portno].ddr; | |
131 | result[8]='\0'; | |
132 | rp = result + 7; | |
133 | for (c = 8; c > 0; c--,rp--,used >>= 1, ddr >>= 1) | |
134 | if (used & 0x01) | |
135 | *rp = io[ ddr & 0x01]; | |
136 | else | |
137 | *rp = '-'; | |
138 | return result; | |
139 | } | |
140 | ||
141 | static int gpio_proc_read(char *buf, char **start, off_t offset, | |
142 | int len, int *unused_i, void *unused_v) | |
143 | { | |
144 | int c,outlen; | |
3c6bee1d | 145 | static const char port_name[]="123456789ABCDEFGH"; |
1da177e4 LT |
146 | outlen = 0; |
147 | for (c = 0; c < MAX_PORT; c++) { | |
148 | if (ddrs[c] == NULL) | |
149 | continue ; | |
150 | len = sprintf(buf,"P%c: %s\n",port_name[c],port_status(c)); | |
151 | buf += len; | |
152 | outlen += len; | |
153 | } | |
154 | return outlen; | |
155 | } | |
156 | ||
157 | static __init int register_proc(void) | |
158 | { | |
159 | struct proc_dir_entry *proc_gpio; | |
160 | ||
161 | proc_gpio = create_proc_entry("gpio", S_IRUGO, NULL); | |
162 | if (proc_gpio) | |
163 | proc_gpio->read_proc = gpio_proc_read; | |
164 | return proc_gpio != NULL; | |
165 | } | |
166 | ||
167 | __initcall(register_proc); | |
168 | #endif | |
169 | ||
170 | void __init h8300_gpio_init(void) | |
171 | { | |
172 | memcpy(gpio_regs,_platform_gpio_table(sizeof(gpio_regs)),sizeof(gpio_regs)); | |
173 | } |