174 строки
3.6 KiB
C
174 строки
3.6 KiB
C
/*
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* linux/arch/h8300/kernel/gpio.c
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*
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* Yoshinori Sato <ysato@users.sourceforge.jp>
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*
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*/
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/*
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* Internal I/O Port Management
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*/
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#include <linux/stddef.h>
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#include <linux/proc_fs.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#define _(addr) (volatile unsigned char *)(addr)
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#if defined(CONFIG_H83007) || defined(CONFIG_H83068)
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#include <asm/regs306x.h>
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static volatile unsigned char *ddrs[] = {
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_(P1DDR),_(P2DDR),_(P3DDR),_(P4DDR),_(P5DDR),_(P6DDR),
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NULL, _(P8DDR),_(P9DDR),_(PADDR),_(PBDDR),
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};
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#define MAX_PORT 11
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#endif
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#if defined(CONFIG_H83002) || defined(CONFIG_H8048)
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/* Fix me!! */
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#include <asm/regs306x.h>
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static volatile unsigned char *ddrs[] = {
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_(P1DDR),_(P2DDR),_(P3DDR),_(P4DDR),_(P5DDR),_(P6DDR),
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NULL, _(P8DDR),_(P9DDR),_(PADDR),_(PBDDR),
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};
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#define MAX_PORT 11
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#endif
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#if defined(CONFIG_H8S2678)
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#include <asm/regs267x.h>
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static volatile unsigned char *ddrs[] = {
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_(P1DDR),_(P2DDR),_(P3DDR),NULL ,_(P5DDR),_(P6DDR),
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_(P7DDR),_(P8DDR),NULL, _(PADDR),_(PBDDR),_(PCDDR),
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_(PDDDR),_(PEDDR),_(PFDDR),_(PGDDR),_(PHDDR),
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_(PADDR),_(PBDDR),_(PCDDR),_(PDDDR),_(PEDDR),_(PFDDR),
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_(PGDDR),_(PHDDR)
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};
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#define MAX_PORT 17
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#endif
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#undef _
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#if !defined(P1DDR)
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#error Unsuppoted CPU Selection
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#endif
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static struct {
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unsigned char used;
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unsigned char ddr;
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} gpio_regs[MAX_PORT];
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extern char *_platform_gpio_table(int length);
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int h8300_reserved_gpio(int port, unsigned int bits)
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{
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unsigned char *used;
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if (port < 0 || port >= MAX_PORT)
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return -1;
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used = &(gpio_regs[port].used);
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if ((*used & bits) != 0)
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return 0;
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*used |= bits;
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return 1;
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}
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int h8300_free_gpio(int port, unsigned int bits)
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{
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unsigned char *used;
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if (port < 0 || port >= MAX_PORT)
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return -1;
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used = &(gpio_regs[port].used);
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if ((*used & bits) != bits)
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return 0;
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*used &= (~bits);
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return 1;
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}
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int h8300_set_gpio_dir(int port_bit,int dir)
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{
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int port = (port_bit >> 8) & 0xff;
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int bit = port_bit & 0xff;
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if (ddrs[port] == NULL)
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return 0;
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if (gpio_regs[port].used & bit) {
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if (dir)
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gpio_regs[port].ddr |= bit;
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else
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gpio_regs[port].ddr &= ~bit;
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*ddrs[port] = gpio_regs[port].ddr;
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return 1;
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} else
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return 0;
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}
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int h8300_get_gpio_dir(int port_bit)
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{
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int port = (port_bit >> 8) & 0xff;
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int bit = port_bit & 0xff;
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if (ddrs[port] == NULL)
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return 0;
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if (gpio_regs[port].used & bit) {
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return (gpio_regs[port].ddr & bit) != 0;
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} else
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return -1;
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}
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#if defined(CONFIG_PROC_FS)
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static char *port_status(int portno)
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{
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static char result[10];
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static const char io[2]={'I','O'};
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char *rp;
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int c;
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unsigned char used,ddr;
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used = gpio_regs[portno].used;
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ddr = gpio_regs[portno].ddr;
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result[8]='\0';
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rp = result + 7;
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for (c = 8; c > 0; c--,rp--,used >>= 1, ddr >>= 1)
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if (used & 0x01)
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*rp = io[ ddr & 0x01];
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else
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*rp = '-';
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return result;
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}
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static int gpio_proc_read(char *buf, char **start, off_t offset,
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int len, int *unused_i, void *unused_v)
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{
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int c,outlen;
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static const char port_name[]="123456789ABCDEFGH";
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outlen = 0;
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for (c = 0; c < MAX_PORT; c++) {
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if (ddrs[c] == NULL)
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continue ;
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len = sprintf(buf,"P%c: %s\n",port_name[c],port_status(c));
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buf += len;
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outlen += len;
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}
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return outlen;
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}
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static __init int register_proc(void)
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{
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struct proc_dir_entry *proc_gpio;
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proc_gpio = create_proc_entry("gpio", S_IRUGO, NULL);
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if (proc_gpio)
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proc_gpio->read_proc = gpio_proc_read;
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return proc_gpio != NULL;
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}
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__initcall(register_proc);
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#endif
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void __init h8300_gpio_init(void)
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{
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memcpy(gpio_regs,_platform_gpio_table(sizeof(gpio_regs)),sizeof(gpio_regs));
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}
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