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>
 22static 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>
 32static 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>
 41static 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
 56static struct {
 57	unsigned char used;
 58	unsigned char ddr;
 59} gpio_regs[MAX_PORT];
 60
 61extern char *_platform_gpio_table(int length);
 62
 63int 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
 76int 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
 89int 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
107int 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)
121static 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
141static 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
157static __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
170void __init h8300_gpio_init(void)
171{
172	memcpy(gpio_regs,_platform_gpio_table(sizeof(gpio_regs)),sizeof(gpio_regs));
173}