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Linux/arch/h8300/kernel/gpio.c

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  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/seq_file.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         static const 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_show(struct seq_file *m, void *v)
143 {
144         static const char port_name[]="123456789ABCDEFGH";
145         int c;
146 
147         for (c = 0; c < MAX_PORT; c++) {
148                 if (ddrs[c] == NULL)
149                         continue;
150                 seq_printf(m, "P%c: %s\n", port_name[c], port_status(c));
151         }
152         return 0;
153 }
154 
155 static int gpio_proc_open(struct inode *inode, struct file *file)
156 {
157         return single_open(file, gpio_proc_show, PDE_DATA(inode));
158 }
159 
160 static const struct file_operations gpio_proc_fops = {
161         .open           = gpio_proc_open,
162         .read           = seq_read,
163         .llseek         = seq_lseek,
164         .release        = single_release,
165 };
166 
167 static __init int register_proc(void)
168 {
169         return proc_create("gpio", S_IRUGO, NULL, &gpio_proc_fops) != NULL;
170 }
171 
172 __initcall(register_proc);
173 #endif
174 
175 void __init h8300_gpio_init(void)
176 {
177         memcpy(gpio_regs,_platform_gpio_table(sizeof(gpio_regs)),sizeof(gpio_regs));
178 }
179 

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