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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2020 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <sbi/sbi_error.h>
#include <sbi/sbi_scratch.h>
#include <sbi_utils/fdt/fdt_helper.h>
#include <sbi_utils/timer/fdt_timer.h>
/* List of FDT timer drivers generated at compile time */
extern struct fdt_timer *fdt_timer_drivers[];
extern unsigned long fdt_timer_drivers_size;
static struct fdt_timer *current_driver = NULL;
void fdt_timer_exit(void)
{
if (current_driver && current_driver->exit)
current_driver->exit();
}
static int fdt_timer_warm_init(void)
{
if (current_driver && current_driver->warm_init)
return current_driver->warm_init();
return 0;
}
static int fdt_timer_cold_init(void)
{
int pos, noff, rc;
struct fdt_timer *drv;
const struct fdt_match *match;
void *fdt = fdt_get_address();
for (pos = 0; pos < fdt_timer_drivers_size; pos++) {
drv = fdt_timer_drivers[pos];
noff = -1;
while ((noff = fdt_find_match(fdt, noff,
drv->match_table, &match)) >= 0) {
/* drv->cold_init must not be NULL */
if (drv->cold_init == NULL)
return SBI_EFAIL;
rc = drv->cold_init(fdt, noff, match);
if (rc == SBI_ENODEV)
continue;
if (rc)
return rc;
current_driver = drv;
/*
* We will have multiple timer devices on multi-die or
* multi-socket systems so we cannot break here.
*/
}
}
/*
* We can't fail here since systems with Sstc might not provide
* mtimer/clint DT node in the device tree.
*/
return 0;
}
int fdt_timer_init(bool cold_boot)
{
int rc;
if (cold_boot) {
rc = fdt_timer_cold_init();
if (rc)
return rc;
}
return fdt_timer_warm_init();
}
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