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// SPDX-License-Identifier: GPL-2.0
/*
* console.c: Routines that deal with sending and receiving IO
* to/from the current console device using the PROM.
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#include <linux/string.h>
/* Non blocking get character from console input device, returns -1
* if no input was taken. This can be used for polling.
*/
int
prom_nbgetchar(void)
{
int i = -1;
unsigned long flags;
local_irq_save(flags);
i = (*(romvec->pv_nbgetchar))();
local_irq_restore(flags);
return i; /* Ugh, we could spin forever on unsupported proms ;( */
}
/* Non blocking put character to console device, returns -1 if
* unsuccessful.
*/
int
prom_nbputchar(char c)
{
unsigned long flags;
int i = -1;
local_irq_save(flags);
i = (*(romvec->pv_nbputchar))(c);
local_irq_restore(flags);
return i; /* Ugh, we could spin forever on unsupported proms ;( */
}
/* Blocking version of get character routine above. */
char
prom_getchar(void)
{
int character;
while((character = prom_nbgetchar()) == -1) ;
return (char) character;
}
/* Blocking version of put character routine above. */
void
prom_putchar(char c)
{
while(prom_nbputchar(c) == -1) ;
return;
}
/* Query for input device type */
#if 0
enum prom_input_device
prom_query_input_device()
{
unsigned long flags;
int st_p;
char propb[64];
char *p;
switch(prom_vers) {
case PROM_V0:
case PROM_V2:
default:
switch(*romvec->pv_stdin) {
case PROMDEV_KBD: return PROMDEV_IKBD;
case PROMDEV_TTYA: return PROMDEV_ITTYA;
case PROMDEV_TTYB: return PROMDEV_ITTYB;
default:
return PROMDEV_I_UNK;
};
case PROM_V3:
case PROM_P1275:
local_irq_save(flags);
st_p = (*romvec->pv_v2devops.v2_inst2pkg)(*romvec->pv_v2bootargs.fd_stdin);
__asm__ __volatile__("ld [%0], %%g6\n\t" : :
"r" (¤t_set[smp_processor_id()]) :
"memory");
local_irq_restore(flags);
if(prom_node_has_property(st_p, "keyboard"))
return PROMDEV_IKBD;
prom_getproperty(st_p, "device_type", propb, sizeof(propb));
if(strncmp(propb, "serial", sizeof("serial")))
return PROMDEV_I_UNK;
prom_getproperty(prom_root_node, "stdin-path", propb, sizeof(propb));
p = propb;
while(*p) p++; p -= 2;
if(p[0] == ':') {
if(p[1] == 'a')
return PROMDEV_ITTYA;
else if(p[1] == 'b')
return PROMDEV_ITTYB;
}
return PROMDEV_I_UNK;
};
}
#endif
/* Query for output device type */
#if 0
enum prom_output_device
prom_query_output_device()
{
unsigned long flags;
int st_p;
char propb[64];
char *p;
int propl;
switch(prom_vers) {
case PROM_V0:
switch(*romvec->pv_stdin) {
case PROMDEV_SCREEN: return PROMDEV_OSCREEN;
case PROMDEV_TTYA: return PROMDEV_OTTYA;
case PROMDEV_TTYB: return PROMDEV_OTTYB;
};
break;
case PROM_V2:
case PROM_V3:
case PROM_P1275:
local_irq_save(flags);
st_p = (*romvec->pv_v2devops.v2_inst2pkg)(*romvec->pv_v2bootargs.fd_stdout);
__asm__ __volatile__("ld [%0], %%g6\n\t" : :
"r" (¤t_set[smp_processor_id()]) :
"memory");
local_irq_restore(flags);
propl = prom_getproperty(st_p, "device_type", propb, sizeof(propb));
if (propl >= 0 && propl == sizeof("display") &&
strncmp("display", propb, sizeof("display")) == 0)
{
return PROMDEV_OSCREEN;
}
if(prom_vers == PROM_V3) {
if(strncmp("serial", propb, sizeof("serial")))
return PROMDEV_O_UNK;
prom_getproperty(prom_root_node, "stdout-path", propb, sizeof(propb));
p = propb;
while(*p) p++; p -= 2;
if(p[0]==':') {
if(p[1] == 'a')
return PROMDEV_OTTYA;
else if(p[1] == 'b')
return PROMDEV_OTTYB;
}
return PROMDEV_O_UNK;
} else {
/* This works on SS-2 (an early OpenFirmware) still. */
switch(*romvec->pv_stdin) {
case PROMDEV_TTYA: return PROMDEV_OTTYA;
case PROMDEV_TTYB: return PROMDEV_OTTYB;
};
}
break;
};
return PROMDEV_O_UNK;
}
#endif
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