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/******************************************************************************
* Copyright (c) 2004, 2008 IBM Corporation
* All rights reserved.
* This program and the accompanying materials
* are made available under the terms of the BSD License
* which accompanies this distribution, and is available at
* http://www.opensource.org/licenses/bsd-license.php
*
* Contributors:
* IBM Corporation - initial implementation
*****************************************************************************/
#include <stdint.h>
#include <stdarg.h>
#include <stdio.h>
#include <rtas.h>
#include <of.h>
#include <kernel.h>
typedef int rtas_arg_t;
typedef struct {
int token;
int nargs;
int nret;
rtas_arg_t args[16];
rtas_arg_t *rets; /* Pointer to return values in args[]. */
} rtas_args_t;
rtas_args_t rtas_args;
typedef struct {
void *rtas_start;
void *rtas_entry;
int rtas_size;
phandle_t dev;
} rtas_t;
extern rtas_t _rtas;
static int instantiate_rtas(void);
void rtas_call_entry(rtas_args_t *, void *, void *);
int
rtas_token(const char *service)
{
int token;
int retVal;
if (_rtas.dev == 0)
instantiate_rtas();
retVal = of_getprop(_rtas.dev, service, &token, sizeof(token));
if (retVal == -1) {
token = 0;
}
return token;
}
int
rtas_call(int token, int nargs, int nret, int *outputs, ...)
{
va_list list;
int i;
rtas_args.token = token;
rtas_args.nargs = nargs;
rtas_args.nret = nret;
rtas_args.rets = (rtas_arg_t *) & (rtas_args.args[nargs]);
va_start(list, outputs);
for (i = 0; i < nargs; ++i) {
rtas_args.args[i] = (rtas_arg_t) (va_arg(list, unsigned int));
}
va_end(list);
for (i = 0; i < nret; ++i)
rtas_args.rets[i] = 0;
rtas_call_entry(&rtas_args, _rtas.rtas_start, _rtas.rtas_entry);
if (nret > 0 && outputs != 0)
for (i = 0; i < nret; i++)
outputs[i] = rtas_args.rets[i];
#if 0
printf("rtas call %x %x %x args: %x %x %x %x %x %x %x %x\n",
token, nargs, nret,
rtas_args.args[0],
rtas_args.args[1],
rtas_args.args[2],
rtas_args.args[3],
rtas_args.args[4], rtas_args.args[5], outputs[0], outputs[1]);
#endif
return ((nret > 0) ? rtas_args.rets[0] : 0);
}
rtas_t _rtas;
static int
instantiate_rtas(void)
{
long long *rtas_mem_space;
ihandle_t ihandle;
_rtas.dev = of_finddevice("/rtas");
if ((long) _rtas.dev < 0) {
printf("\nCould not open /rtas\n");
return -1;
}
of_getprop(_rtas.dev, "rtas-size", &_rtas.rtas_size,
sizeof(_rtas.rtas_size));
if (_rtas.rtas_size <= 0) {
printf("\nSize of rtas (%x) too small to make sense\n",
_rtas.rtas_size);
return -1;
}
rtas_mem_space = (long long *) malloc_aligned(_rtas.rtas_size, 0x100);
if (!rtas_mem_space) {
printf("\nFailed to allocated memory for RTAS\n");
return -1;
}
ihandle = of_open("/rtas");
if ((long) ihandle < 0) {
printf("Could not open /rtas\n");
return -1;
}
if ((long) (_rtas.rtas_entry = of_call_method_3("instantiate-rtas",
ihandle,
p32cast rtas_mem_space))
> 0) {
_rtas.rtas_start = rtas_mem_space;
} else {
printf("instantiate-rtas failed\n");
return -1;
}
#if 0
printf("\ninstantiate-rtas at %x size %x entry %x\n",
_rtas.rtas_start, _rtas.rtas_size, _rtas.rtas_entry);
#endif
return 0;
}
static int read_pci_config_token = 0;
static int write_pci_config_token = 0;
static int ibm_read_pci_config_token = 0;
static int ibm_write_pci_config_token = 0;
static int get_time_of_day_token = 0;
void
rtas_init()
{
int ret;
ret = instantiate_rtas();
if (ret)
return;
read_pci_config_token = rtas_token("read-pci-config");
ibm_read_pci_config_token = rtas_token("ibm,read-pci-config");
write_pci_config_token = rtas_token("write-pci-config");
ibm_write_pci_config_token = rtas_token("ibm,write-pci-config");
get_time_of_day_token = rtas_token("get-time-of-day");
}
int
rtas_pci_config_read(long long puid, int size, int bus, int devfn, int offset)
{
int value[2];
if (ibm_read_pci_config_token && puid) {
rtas_call(ibm_read_pci_config_token, 4, 2, value,
bus << 16 | devfn << 8 | offset,
puid >> 32, puid & 0xffffffffULL, size);
} else if (read_pci_config_token) {
rtas_call(read_pci_config_token, 2, 2, value,
bus << 16 | devfn << 8 | offset, size);
}
return value[1];
}
int
rtas_pci_config_write(long long puid, int size, int bus, int devfn,
int offset, int value)
{
int rc;
if (ibm_write_pci_config_token && puid) {
rtas_call(ibm_write_pci_config_token, 5, 1, &rc,
bus << 16 | devfn << 8 | offset,
puid >> 32, puid & 0xffffffffULL, size, value);
} else
rtas_call(write_pci_config_token, 3, 1, &rc,
bus << 16 | devfn << 8 | offset, size, value);
return rc;
}
int
rtas_get_time_of_day(dtime * get)
{
int rc = -1;
unsigned int year;
unsigned int month;
unsigned int day;
unsigned int hour;
unsigned int minute;
unsigned int second;
unsigned int nano;
if (get_time_of_day_token)
rtas_call(get_time_of_day_token, 0, 8, &rc, &year, &month, &day,
&hour, &minute, &second, &nano);
get->year = year;
get->month = month;
get->day = day;
get->hour = hour;
get->minute = minute;
get->second = second;
get->nano = nano;
return rc;
}
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