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/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
h8300_reserved_gpio(int port,unsigned int bits)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
h8300_free_gpio(int port,unsigned int bits)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
h8300_set_gpio_dir(int port_bit,int dir)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
h8300_get_gpio_dir(int port_bit)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)
port_status(int portno)121 static char *port_status(int portno)
122 {
123 static char result[10];
124 static const char io[2]={'I','O'};
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
gpio_proc_read(char * buf,char ** start,off_t offset,int len,int * unused_i,void * unused_v)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;
145 static const char port_name[]="123456789ABCDEFGH";
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
register_proc(void)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
h8300_gpio_init(void)170 void __init h8300_gpio_init(void)
171 {
172 memcpy(gpio_regs,_platform_gpio_table(sizeof(gpio_regs)),sizeof(gpio_regs));
173 }
174