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drivers: espi: npcx: update the arbitration for eSPI TAF access

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This commit adds the arbitration when EC and eSPI TAF access flash
simultaneously.

Signed-off-by: Tom Chang <CHChang19@nuvoton.com>
This commit is contained in:
Tom Chang 2025-02-12 18:12:19 +08:00 • committed by Benjamin Cabé
commit de3da0e4fa
4 changed files with 44 additions and 0 deletions
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8
drivers/espi/Kconfig.npcx
View file

@ -98,6 +98,14 @@ config ESPI_TAF_NPCX_RPMC_SUPPORT
help
This option enable the handler for eSPI TAF RPMC request.
config ESPI_TAF_NPCX_STS_AWAIT_TIMEOUT
int "A timeout value in microseconds to wait for automatic read status"
depends on ESPI_TAF_NPCX
default 20000
help
This option specifies the timeout value in microseconds (us) for checking
automatic read status.
# The default value 'y' for the existing options if ESPI_NPCX is selected.
if ESPI_NPCX

32
drivers/espi/espi_taf_npcx.c
View file

@ -666,6 +666,38 @@ static void espi_taf_event_handler(const struct device *dev, struct espi_callbac
k_work_submit(&npcx_espi_taf_data.work);
}
int espi_taf_npcx_block(const struct device *dev, bool en_block)
{
struct espi_reg *const inst = HAL_INSTANCE(dev);
if (!IS_BIT_SET(inst->FLASHCTL, NPCX_FLASHCTL_SAF_AUTO_READ)) {
return 0;
}
if (en_block) {
if (WAIT_FOR(!IS_BIT_SET(inst->ESPISTS, NPCX_ESPISTS_FLAUTORDREQ),
CONFIG_ESPI_TAF_NPCX_STS_AWAIT_TIMEOUT, NULL) == false) {
LOG_ERR("Check Automatic Read Queue Empty Timeout");
return -ETIMEDOUT;
}
inst->FLASHCTL |= BIT(NPCX_FLASHCTL_AUTO_RD_DIS_CTL);
if (WAIT_FOR(IS_BIT_SET(inst->ESPISTS, NPCX_ESPISTS_AUTO_RD_DIS_STS),
CONFIG_ESPI_TAF_NPCX_STS_AWAIT_TIMEOUT, NULL) == false) {
inst->FLASHCTL &= ~BIT(NPCX_FLASHCTL_AUTO_RD_DIS_CTL);
inst->ESPISTS |= BIT(NPCX_ESPISTS_AUTO_RD_DIS_STS);
LOG_ERR("Check Automatic Read Disable Timeout");
return -ETIMEDOUT;
}
} else {
inst->FLASHCTL &= ~BIT(NPCX_FLASHCTL_AUTO_RD_DIS_CTL);
inst->ESPISTS |= BIT(NPCX_ESPISTS_AUTO_RD_DIS_STS);
}
return 0;
}
int npcx_init_taf(const struct device *dev, sys_slist_t *callbacks)
{
espi_init_callback(&espi_taf_cb, espi_taf_event_handler, ESPI_BUS_TAF_NOTIFICATION);

2
soc/nuvoton/npcx/common/reg/reg_def.h
View file

@ -753,6 +753,7 @@ struct espi_reg {
#define NPCX_ESPISTS_VWUPD 8
#define NPCX_ESPISTS_ESPIRST 9
#define NPCX_ESPISTS_PLTRST 10
#define NPCX_ESPISTS_FLAUTORDREQ 14
#define NPCX_ESPISTS_AMERR 15
#define NPCX_ESPISTS_AMDONE 16
#define NPCX_ESPISTS_VWUPDW 17
@ -762,6 +763,7 @@ struct espi_reg {
#define NPCX_ESPISTS_BMBURSTERR 22
#define NPCX_ESPISTS_BMBURSTDONE 23
#define NPCX_ESPISTS_ESPIRST_LVL 24
#define NPCX_ESPISTS_AUTO_RD_DIS_STS 29
#define NPCX_VWSWIRQ_IRQ_NUM FIELD(0, 7)
#define NPCX_VWSWIRQ_IRQ_LVL 7
#define NPCX_VWSWIRQ_INDEX FIELD(8, 7)

2
soc/nuvoton/npcx/common/soc_espi_taf.h
View file

@ -151,6 +151,8 @@ struct npcx_taf_head {
int npcx_init_taf(const struct device *dev, sys_slist_t *callbacks);
int espi_taf_npcx_block(const struct device *dev, bool en_block);
#ifdef __cplusplus
}
#endif