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mpc5121: add PSC serial communication routines 

Signed-off-by: Anatolij Gustschin <agust@denx.de>
This commit is contained in:
Anatolij Gustschin 2010-04-24 19:27:06 +02:00 committed by Wolfgang Denk
parent e3b28e6732
commit 8e234e33bf
2 changed files with 94 additions and 0 deletions
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87
arch/powerpc/cpu/mpc512x/serial.c
View File

@ -401,3 +401,90 @@ int serial_getcts(void)
return serial_getcts_dev(CONFIG_PSC_CONSOLE);
}
#endif /* CONFIG_PSC_CONSOLE */
#if defined(CONFIG_SERIAL_MULTI)
#include <stdio_dev.h>
/*
* Routines for communication with serial devices over PSC
*/
/* Bitfield for initialized PSCs */
static unsigned int initialized;
struct stdio_dev *open_port(int num, int baudrate)
{
struct stdio_dev *port;
char env_var[16];
char env_val[10];
char name[7];
if (num < 0 || num > 11)
return NULL;
sprintf(name, "psc%d", num);
port = stdio_get_by_name(name);
if (!port)
return NULL;
if (!test_bit(num, &initialized)) {
sprintf(env_var, "psc%d_baudrate", num);
sprintf(env_val, "%d", baudrate);
setenv(env_var, env_val);
if (port->start())
return NULL;
set_bit(num, &initialized);
}
return port;
}
int close_port(int num)
{
struct stdio_dev *port;
int ret;
char name[7];
if (num < 0 || num > 11)
return -1;
sprintf(name, "psc%d", num);
port = stdio_get_by_name(name);
if (!port)
return -1;
ret = port->stop();
clear_bit(num, &initialized);
return ret;
}
int write_port(struct stdio_dev *port, char *buf)
{
if (!port || !buf)
return -1;
port->puts(buf);
return 0;
}
int read_port(struct stdio_dev *port, char *buf, int size)
{
int cnt = 0;
if (!port || !buf)
return -1;
if (!size)
return 0;
while (port->tstc()) {
buf[cnt++] = port->getc();
if (cnt > size)
break;
}
return cnt;
}
#endif /* CONFIG_SERIAL_MULTI */

7
include/serial.h
View File

@ -92,4 +92,11 @@ extern int usbtty_tstc(void);
#endif /* CONFIG_USB_TTY */
#if defined(CONFIG_MPC512X) && defined(CONFIG_SERIAL_MULTI)
extern struct stdio_dev *open_port(int num, int baudrate);
extern int close_port(int num);
extern int write_port(struct stdio_dev *port, char *buf);
extern int read_port(struct stdio_dev *port, char *buf, int size);
#endif
#endif