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// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright 2019 Broadcom.
*/
#include <bcm_elog.h>
#include <io.h>
static struct bcm_elog global_elog;
void bcm_elog_putchar(char ch)
{
struct bcm_elog *elog = &global_elog;
uint32_t offset = 0, len = 0;
vaddr_t base = 0;
base = io_pa_or_va(&elog->base);
offset = io_read32(base + BCM_ELOG_OFF_OFFSET);
len = io_read32(base + BCM_ELOG_LEN_OFFSET);
io_write8(base + offset, ch);
offset++;
/* Log buffer is now full and need to wrap around */
if (offset >= elog->max_size)
offset = BCM_ELOG_HEADER_LEN;
/* Only increment length when log buffer is not full */
if (len < elog->max_size - BCM_ELOG_HEADER_LEN)
len++;
io_write32(base + BCM_ELOG_OFF_OFFSET, offset);
io_write32(base + BCM_ELOG_LEN_OFFSET, len);
}
void bcm_elog_init(uintptr_t pa_base, uint32_t size)
{
struct bcm_elog *elog = &global_elog;
uint32_t val = 0;
vaddr_t base = 0;
elog->base.pa = pa_base;
elog->max_size = size;
base = io_pa_or_va(&elog->base);
/*
* If a valid signature is found, it means logging is already
* initialized. In this case, we should not re-initialize the entry
* header in the designated memory
*/
val = io_read32(base + BCM_ELOG_SIG_OFFSET);
if (val != BCM_ELOG_SIG_VAL) {
io_write32(base + BCM_ELOG_SIG_OFFSET, BCM_ELOG_SIG_VAL);
io_write32(base + BCM_ELOG_OFF_OFFSET, BCM_ELOG_HEADER_LEN);
io_write32(base + BCM_ELOG_LEN_OFFSET, 0);
}
}
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