2 * linux/arch/h8300/kernel/gpio.c
4 * Yoshinori Sato <ysato@users.sourceforge.jp>
9 * Internal I/O Port Management
12 #include <linux/stddef.h>
13 #include <linux/proc_fs.h>
14 #include <linux/kernel.h>
15 #include <linux/string.h>
17 #include <linux/init.h>
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),
29 #if defined(CONFIG_H83002) || defined(CONFIG_H8048)
31 #include <asm/regs306x.h>
32 static volatile unsigned char *ddrs[] = {
33 _(P1DDR),_(P2DDR),_(P3DDR),_(P4DDR),_(P5DDR),_(P6DDR),
34 NULL, _(P8DDR),_(P9DDR),_(PADDR),_(PBDDR),
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),
53 #error Unsuppoted CPU Selection
59 } gpio_regs[MAX_PORT];
61 extern char *_platform_gpio_table(int length);
63 int h8300_reserved_gpio(int port, unsigned int bits)
67 if (port < 0 || port >= MAX_PORT)
69 used = &(gpio_regs[port].used);
70 if ((*used & bits) != 0)
76 int h8300_free_gpio(int port, unsigned int bits)
80 if (port < 0 || port >= MAX_PORT)
82 used = &(gpio_regs[port].used);
83 if ((*used & bits) != bits)
89 int h8300_set_gpio_dir(int port_bit,int dir)
91 int port = (port_bit >> 8) & 0xff;
92 int bit = port_bit & 0xff;
94 if (ddrs[port] == NULL)
96 if (gpio_regs[port].used & bit) {
98 gpio_regs[port].ddr |= bit;
100 gpio_regs[port].ddr &= ~bit;
101 *ddrs[port] = gpio_regs[port].ddr;
107 int h8300_get_gpio_dir(int port_bit)
109 int port = (port_bit >> 8) & 0xff;
110 int bit = port_bit & 0xff;
112 if (ddrs[port] == NULL)
114 if (gpio_regs[port].used & bit) {
115 return (gpio_regs[port].ddr & bit) != 0;
120 #if defined(CONFIG_PROC_FS)
121 static char *port_status(int portno)
123 static char result[10];
124 static const char io[2]={'I','O'};
127 unsigned char used,ddr;
129 used = gpio_regs[portno].used;
130 ddr = gpio_regs[portno].ddr;
133 for (c = 8; c > 0; c--,rp--,used >>= 1, ddr >>= 1)
135 *rp = io[ ddr & 0x01];
141 static int gpio_proc_read(char *buf, char **start, off_t offset,
142 int len, int *unused_i, void *unused_v)
145 static const char port_name[]="123456789ABCDEFGH";
147 for (c = 0; c < MAX_PORT; c++) {
150 len = sprintf(buf,"P%c: %s\n",port_name[c],port_status(c));
157 static __init int register_proc(void)
159 struct proc_dir_entry *proc_gpio;
161 proc_gpio = create_proc_entry("gpio", S_IRUGO, NULL);
163 proc_gpio->read_proc = gpio_proc_read;
164 return proc_gpio != NULL;
167 __initcall(register_proc);
170 void __init h8300_gpio_init(void)
172 memcpy(gpio_regs,_platform_gpio_table(sizeof(gpio_regs)),sizeof(gpio_regs));