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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/h8300/kernel/gpio.c
downloadconfigs-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/h8300/kernel/gpio.c')
-rw-r--r--arch/h8300/kernel/gpio.c174
1 files changed, 174 insertions, 0 deletions
diff --git a/arch/h8300/kernel/gpio.c b/arch/h8300/kernel/gpio.c
new file mode 100644
index 00000000000..795682b873e
--- /dev/null
+++ b/arch/h8300/kernel/gpio.c
@@ -0,0 +1,174 @@
+/*
+ * linux/arch/h8300/kernel/gpio.c
+ *
+ * Yoshinori Sato <ysato@users.sourceforge.jp>
+ *
+ */
+
+/*
+ * Internal I/O Port Management
+ */
+
+#include <linux/config.h>
+#include <linux/stddef.h>
+#include <linux/proc_fs.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+
+#define _(addr) (volatile unsigned char *)(addr)
+#if defined(CONFIG_H83007) || defined(CONFIG_H83068)
+#include <asm/regs306x.h>
+static volatile unsigned char *ddrs[] = {
+ _(P1DDR),_(P2DDR),_(P3DDR),_(P4DDR),_(P5DDR),_(P6DDR),
+ NULL, _(P8DDR),_(P9DDR),_(PADDR),_(PBDDR),
+};
+#define MAX_PORT 11
+#endif
+
+ #if defined(CONFIG_H83002) || defined(CONFIG_H8048)
+/* Fix me!! */
+#include <asm/regs306x.h>
+static volatile unsigned char *ddrs[] = {
+ _(P1DDR),_(P2DDR),_(P3DDR),_(P4DDR),_(P5DDR),_(P6DDR),
+ NULL, _(P8DDR),_(P9DDR),_(PADDR),_(PBDDR),
+};
+#define MAX_PORT 11
+#endif
+
+#if defined(CONFIG_H8S2678)
+#include <asm/regs267x.h>
+static volatile unsigned char *ddrs[] = {
+ _(P1DDR),_(P2DDR),_(P3DDR),NULL ,_(P5DDR),_(P6DDR),
+ _(P7DDR),_(P8DDR),NULL, _(PADDR),_(PBDDR),_(PCDDR),
+ _(PDDDR),_(PEDDR),_(PFDDR),_(PGDDR),_(PHDDR),
+ _(PADDR),_(PBDDR),_(PCDDR),_(PDDDR),_(PEDDR),_(PFDDR),
+ _(PGDDR),_(PHDDR)
+};
+#define MAX_PORT 17
+#endif
+#undef _
+
+#if !defined(P1DDR)
+#error Unsuppoted CPU Selection
+#endif
+
+static struct {
+ unsigned char used;
+ unsigned char ddr;
+} gpio_regs[MAX_PORT];
+
+extern char *_platform_gpio_table(int length);
+
+int h8300_reserved_gpio(int port, unsigned int bits)
+{
+ unsigned char *used;
+
+ if (port < 0 || port >= MAX_PORT)
+ return -1;
+ used = &(gpio_regs[port].used);
+ if ((*used & bits) != 0)
+ return 0;
+ *used |= bits;
+ return 1;
+}
+
+int h8300_free_gpio(int port, unsigned int bits)
+{
+ unsigned char *used;
+
+ if (port < 0 || port >= MAX_PORT)
+ return -1;
+ used = &(gpio_regs[port].used);
+ if ((*used & bits) != bits)
+ return 0;
+ *used &= (~bits);
+ return 1;
+}
+
+int h8300_set_gpio_dir(int port_bit,int dir)
+{
+ int port = (port_bit >> 8) & 0xff;
+ int bit = port_bit & 0xff;
+
+ if (ddrs[port] == NULL)
+ return 0;
+ if (gpio_regs[port].used & bit) {
+ if (dir)
+ gpio_regs[port].ddr |= bit;
+ else
+ gpio_regs[port].ddr &= ~bit;
+ *ddrs[port] = gpio_regs[port].ddr;
+ return 1;
+ } else
+ return 0;
+}
+
+int h8300_get_gpio_dir(int port_bit)
+{
+ int port = (port_bit >> 8) & 0xff;
+ int bit = port_bit & 0xff;
+
+ if (ddrs[port] == NULL)
+ return 0;
+ if (gpio_regs[port].used & bit) {
+ return (gpio_regs[port].ddr & bit) != 0;
+ } else
+ return -1;
+}
+
+#if defined(CONFIG_PROC_FS)
+static char *port_status(int portno)
+{
+ static char result[10];
+ const static char io[2]={'I','O'};
+ char *rp;
+ int c;
+ unsigned char used,ddr;
+
+ used = gpio_regs[portno].used;
+ ddr = gpio_regs[portno].ddr;
+ result[8]='\0';
+ rp = result + 7;
+ for (c = 8; c > 0; c--,rp--,used >>= 1, ddr >>= 1)
+ if (used & 0x01)
+ *rp = io[ ddr & 0x01];
+ else
+ *rp = '-';
+ return result;
+}
+
+static int gpio_proc_read(char *buf, char **start, off_t offset,
+ int len, int *unused_i, void *unused_v)
+{
+ int c,outlen;
+ const static char port_name[]="123456789ABCDEFGH";
+ outlen = 0;
+ for (c = 0; c < MAX_PORT; c++) {
+ if (ddrs[c] == NULL)
+ continue ;
+ len = sprintf(buf,"P%c: %s\n",port_name[c],port_status(c));
+ buf += len;
+ outlen += len;
+ }
+ return outlen;
+}
+
+static __init int register_proc(void)
+{
+ struct proc_dir_entry *proc_gpio;
+
+ proc_gpio = create_proc_entry("gpio", S_IRUGO, NULL);
+ if (proc_gpio)
+ proc_gpio->read_proc = gpio_proc_read;
+ return proc_gpio != NULL;
+}
+
+__initcall(register_proc);
+#endif
+
+void __init h8300_gpio_init(void)
+{
+ memcpy(gpio_regs,_platform_gpio_table(sizeof(gpio_regs)),sizeof(gpio_regs));
+}