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/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <device/mmio.h>
#include <soc/addressmap.h>
#include <soc/lastbus_v2.h>
#include <timer.h>
#define SYS_TIMER_0_OFFSET 0x400
#define SYS_TIMER_1_OFFSET 0x404
#define DEBUG_RESULT_OFFSET 0x408
static bool lastbus_is_timeout(const struct lastbus_monitor *m)
{
return read32p(m->base) & LASTBUS_TIMEOUT;
}
static uint64_t gray_code_to_binary(uint64_t gray_code)
{
uint64_t value = 0;
while (gray_code) {
value ^= gray_code;
gray_code >>= 1;
}
return value;
}
static void lastbus_dump_monitor(const struct lastbus_monitor *m)
{
int i;
uint64_t gray_code, bin_code;
printk(BIOS_INFO, "--- %s %#lx %ld ---\n", m->name, m->base, m->num_ports);
for (i = 0; i < m->num_ports; i++)
printk(BIOS_INFO, "%08x\n",
read32p(m->base + DEBUG_RESULT_OFFSET + (i * 4)));
gray_code = (uint64_t)read32p(m->base + SYS_TIMER_1_OFFSET) << 32 |
read32p(m->base + SYS_TIMER_0_OFFSET);
bin_code = gray_code_to_binary(gray_code);
printk(BIOS_INFO, "\ntimestamp: %#llx\n", bin_code);
}
static void lastbus_dump(void)
{
const struct lastbus_monitor *m;
bool found = false;
int i;
for (i = 0; i < lastbus_cfg.num_used_monitors; i++) {
m = &lastbus_cfg.monitors[i];
if (!lastbus_is_timeout(m))
continue;
if (!found)
printk(BIOS_INFO,
"\n******************* %s lastbus ******************\n",
lastbus_cfg.latch_platform);
found = true;
lastbus_dump_monitor(m);
}
}
static u16 calculate_timeout_thres(u16 bus_freq_mhz, u32 timeout_ms)
{
u64 value;
value = ((u64)timeout_ms * USECS_PER_MSEC * bus_freq_mhz) >> 10;
if (value >= UINT16_MAX)
return UINT16_MAX - 1;
return value >= 1 ? value - 1 : 0;
}
static void lastbus_init_monitor(const struct lastbus_monitor *m,
u32 timeout_ms, u32 timeout_type)
{
u16 timeout_thres;
int i;
for (i = 0; i < m->num_idle_mask; i++)
write32p(m->base + m->idle_masks[i].reg_offset,
m->idle_masks[i].reg_value);
/* clear timeout status with DBG_CKEN */
write32p(m->base, LASTBUS_TIMEOUT_CLR | LASTBUS_DEBUG_CKEN);
/* de-assert clear bit */
clrbits32p(m->base, LASTBUS_TIMEOUT_CLR);
if (timeout_ms == UINT32_MAX)
timeout_thres = 0xFFFF;
else
timeout_thres = calculate_timeout_thres(m->bus_freq_mhz, timeout_ms);
setbits32p(m->base, (timeout_thres << TIMEOUT_THRES_SHIFT) |
(timeout_type << TIMEOUT_TYPE_SHIFT));
setbits32p(m->base, LASTBUS_DEBUG_EN);
}
static void lastbus_setup(void)
{
int i;
for (i = 0; i < lastbus_cfg.num_used_monitors; i++)
lastbus_init_monitor(&lastbus_cfg.monitors[i], lastbus_cfg.timeout_ms,
lastbus_cfg.timeout_type);
}
void lastbus_init(void)
{
lastbus_dump();
lastbus_setup();
}
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