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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 | ||
12 | #include <linux/config.h> | |
13 | #include <linux/stddef.h> | |
14 | #include <linux/proc_fs.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/string.h> | |
17 | #include <linux/fs.h> | |
18 | #include <linux/init.h> | |
19 | ||
20 | #define _(addr) (volatile unsigned char *)(addr) | |
21 | #if defined(CONFIG_H83007) || defined(CONFIG_H83068) | |
22 | #include <asm/regs306x.h> | |
23 | static volatile unsigned char *ddrs[] = { | |
24 | _(P1DDR),_(P2DDR),_(P3DDR),_(P4DDR),_(P5DDR),_(P6DDR), | |
25 | NULL, _(P8DDR),_(P9DDR),_(PADDR),_(PBDDR), | |
26 | }; | |
27 | #define MAX_PORT 11 | |
28 | #endif | |
29 | ||
30 | #if defined(CONFIG_H83002) || defined(CONFIG_H8048) | |
31 | /* Fix me!! */ | |
32 | #include <asm/regs306x.h> | |
33 | static volatile unsigned char *ddrs[] = { | |
34 | _(P1DDR),_(P2DDR),_(P3DDR),_(P4DDR),_(P5DDR),_(P6DDR), | |
35 | NULL, _(P8DDR),_(P9DDR),_(PADDR),_(PBDDR), | |
36 | }; | |
37 | #define MAX_PORT 11 | |
38 | #endif | |
39 | ||
40 | #if defined(CONFIG_H8S2678) | |
41 | #include <asm/regs267x.h> | |
42 | static volatile unsigned char *ddrs[] = { | |
43 | _(P1DDR),_(P2DDR),_(P3DDR),NULL ,_(P5DDR),_(P6DDR), | |
44 | _(P7DDR),_(P8DDR),NULL, _(PADDR),_(PBDDR),_(PCDDR), | |
45 | _(PDDDR),_(PEDDR),_(PFDDR),_(PGDDR),_(PHDDR), | |
46 | _(PADDR),_(PBDDR),_(PCDDR),_(PDDDR),_(PEDDR),_(PFDDR), | |
47 | _(PGDDR),_(PHDDR) | |
48 | }; | |
49 | #define MAX_PORT 17 | |
50 | #endif | |
51 | #undef _ | |
52 | ||
53 | #if !defined(P1DDR) | |
54 | #error Unsuppoted CPU Selection | |
55 | #endif | |
56 | ||
57 | static struct { | |
58 | unsigned char used; | |
59 | unsigned char ddr; | |
60 | } gpio_regs[MAX_PORT]; | |
61 | ||
62 | extern char *_platform_gpio_table(int length); | |
63 | ||
64 | int h8300_reserved_gpio(int port, unsigned int bits) | |
65 | { | |
66 | unsigned char *used; | |
67 | ||
68 | if (port < 0 || port >= MAX_PORT) | |
69 | return -1; | |
70 | used = &(gpio_regs[port].used); | |
71 | if ((*used & bits) != 0) | |
72 | return 0; | |
73 | *used |= bits; | |
74 | return 1; | |
75 | } | |
76 | ||
77 | int h8300_free_gpio(int port, unsigned int bits) | |
78 | { | |
79 | unsigned char *used; | |
80 | ||
81 | if (port < 0 || port >= MAX_PORT) | |
82 | return -1; | |
83 | used = &(gpio_regs[port].used); | |
84 | if ((*used & bits) != bits) | |
85 | return 0; | |
86 | *used &= (~bits); | |
87 | return 1; | |
88 | } | |
89 | ||
90 | int h8300_set_gpio_dir(int port_bit,int dir) | |
91 | { | |
92 | int port = (port_bit >> 8) & 0xff; | |
93 | int bit = port_bit & 0xff; | |
94 | ||
95 | if (ddrs[port] == NULL) | |
96 | return 0; | |
97 | if (gpio_regs[port].used & bit) { | |
98 | if (dir) | |
99 | gpio_regs[port].ddr |= bit; | |
100 | else | |
101 | gpio_regs[port].ddr &= ~bit; | |
102 | *ddrs[port] = gpio_regs[port].ddr; | |
103 | return 1; | |
104 | } else | |
105 | return 0; | |
106 | } | |
107 | ||
108 | int h8300_get_gpio_dir(int port_bit) | |
109 | { | |
110 | int port = (port_bit >> 8) & 0xff; | |
111 | int bit = port_bit & 0xff; | |
112 | ||
113 | if (ddrs[port] == NULL) | |
114 | return 0; | |
115 | if (gpio_regs[port].used & bit) { | |
116 | return (gpio_regs[port].ddr & bit) != 0; | |
117 | } else | |
118 | return -1; | |
119 | } | |
120 | ||
121 | #if defined(CONFIG_PROC_FS) | |
122 | static char *port_status(int portno) | |
123 | { | |
124 | static char result[10]; | |
125 | const static char io[2]={'I','O'}; | |
126 | char *rp; | |
127 | int c; | |
128 | unsigned char used,ddr; | |
129 | ||
130 | used = gpio_regs[portno].used; | |
131 | ddr = gpio_regs[portno].ddr; | |
132 | result[8]='\0'; | |
133 | rp = result + 7; | |
134 | for (c = 8; c > 0; c--,rp--,used >>= 1, ddr >>= 1) | |
135 | if (used & 0x01) | |
136 | *rp = io[ ddr & 0x01]; | |
137 | else | |
138 | *rp = '-'; | |
139 | return result; | |
140 | } | |
141 | ||
142 | static int gpio_proc_read(char *buf, char **start, off_t offset, | |
143 | int len, int *unused_i, void *unused_v) | |
144 | { | |
145 | int c,outlen; | |
146 | const static char port_name[]="123456789ABCDEFGH"; | |
147 | outlen = 0; | |
148 | for (c = 0; c < MAX_PORT; c++) { | |
149 | if (ddrs[c] == NULL) | |
150 | continue ; | |
151 | len = sprintf(buf,"P%c: %s\n",port_name[c],port_status(c)); | |
152 | buf += len; | |
153 | outlen += len; | |
154 | } | |
155 | return outlen; | |
156 | } | |
157 | ||
158 | static __init int register_proc(void) | |
159 | { | |
160 | struct proc_dir_entry *proc_gpio; | |
161 | ||
162 | proc_gpio = create_proc_entry("gpio", S_IRUGO, NULL); | |
163 | if (proc_gpio) | |
164 | proc_gpio->read_proc = gpio_proc_read; | |
165 | return proc_gpio != NULL; | |
166 | } | |
167 | ||
168 | __initcall(register_proc); | |
169 | #endif | |
170 | ||
171 | void __init h8300_gpio_init(void) | |
172 | { | |
173 | memcpy(gpio_regs,_platform_gpio_table(sizeof(gpio_regs)),sizeof(gpio_regs)); | |
174 | } |