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drivers: espi: npcx: ensure the host receives the value from eSPI VW

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This commit adds an option to verify weather the host has read the value
after the wire 3-0 bits have been updated.

Signed-off-by: Tom Chang <CHChang19@nuvoton.com>
This commit is contained in:
Tom Chang 2025-04-08 10:45:07 +08:00 • committed by Benjamin Cabé
commit eb5597e90a
3 changed files with 30 additions and 0 deletions
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13
drivers/espi/Kconfig.npcx
View file

@ -60,6 +60,19 @@ config ESPI_NPCX_PERIPHERAL_DEBUG_PORT_80_RING_BUF_SIZE
The size of the ring buffer in byte used by the Port80 ISR to store
Postcodes from Host.
config ESPI_NPCX_VWIRE_ENABLE_SEND_CHECK
bool "Check the value was read by host after wire bits changed"
help
This option enables the function to check whether the host has read the value
after the wire data changes.
config ESPI_NPCX_WIRE_SEND_TIMEOUT_US
int "eSPI virtual wire send timeout count"
default 1000
help
The times to check status after sending the eSPI virtual wire signal. The unit
is microseconds (µs).
config ESPI_TAF_NPCX
bool "Nuvoton NPCX embedded controller (EC) ESPI TAF driver"
depends on SOC_SERIES_NPCX4

16
drivers/espi/espi_npcx.c
View file

@ -859,9 +859,25 @@ static int espi_npcx_send_vwire(const struct device *dev,
if (signal >= ESPI_VWIRE_SIGNAL_TARGET_GPIO_0) {
SET_FIELD(inst->VWGPSM[reg_idx], NPCX_VWEVSM_WIRE, val);
reg_val = inst->VWGPSM[reg_idx];
if (IS_ENABLED(CONFIG_ESPI_NPCX_VWIRE_ENABLE_SEND_CHECK)) {
if (!WAIT_FOR(!IS_BIT_SET(inst->VWGPSM[reg_idx], NPCX_VWEVSM_DIRTY),
CONFIG_ESPI_NPCX_WIRE_SEND_TIMEOUT_US, NULL)) {
LOG_ERR("%s signal %d timeout", __func__, signal);
return -ETIMEDOUT;
}
}
} else {
SET_FIELD(inst->VWEVSM[reg_idx], NPCX_VWEVSM_WIRE, val);
reg_val = inst->VWEVSM[reg_idx];
if (IS_ENABLED(CONFIG_ESPI_NPCX_VWIRE_ENABLE_SEND_CHECK)) {
if (!WAIT_FOR(!IS_BIT_SET(inst->VWEVSM[reg_idx], NPCX_VWEVSM_DIRTY),
CONFIG_ESPI_NPCX_WIRE_SEND_TIMEOUT_US, NULL)) {
LOG_ERR("%s signal %d timeout", __func__, signal);
return -ETIMEDOUT;
}
}
}
LOG_DBG("Send VW: %s%d 0x%08X", reg_name, reg_idx, reg_val);

1
soc/nuvoton/npcx/common/npcxn/include/reg_def.h
View file

@ -727,6 +727,7 @@ struct espi_reg {
#define NPCX_VWEVSM_INDEX FIELD(8, 7)
#define NPCX_VWEVSM_INDEX_EN 15
#define NPCX_VWEVSM_BIT_VALID(n) (4+n)
#define NPCX_VWEVSM_DIRTY 16
#define NPCX_VWEVSM_HW_WIRE FIELD(24, 4)
#define NPCX_VWGPSM_INDEX_EN 15
#define NPCX_OOBCTL_OOB_FREE 0