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samples: drivers: espi: Showcase how to handle lenghty boot initializations

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Add sample where a fictious lenghty operation is required before a more
elaborate handshake is perform with eSPI master.
This requires sending SLAVE_BOOT_DONE virtual wire explicitly.

Signed-off-by: Jose Alberto Meza <jose.a.meza.arellano@intel.com>
This commit is contained in:
Jose Alberto Meza 2020-08-27 14:48:10 -07:00 • committed by Anas Nashif
commit e3eb9bedec
1 changed files with 39 additions and 0 deletions
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39
samples/drivers/espi/src/main.c
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@ -523,6 +523,25 @@ int get_pch_temp(struct device *dev, int *temp)
return 0;
}
#ifndef CONFIG_ESPI_AUTOMATIC_BOOT_DONE_ACKNOWLEDGE
static void send_slave_bootdone(void)
{
int ret;
uint8_t boot_done;
ret = espi_receive_vwire(espi_dev, ESPI_VWIRE_SIGNAL_SLV_BOOT_DONE,
&boot_done);
LOG_INF("%s boot_done: %d", __func__, boot_done);
if (ret) {
LOG_WRN("Fail to retrieve slave boot done");
} else if (!boot_done) {
/* SLAVE_BOOT_DONE & SLAVE_LOAD_STS have to be sent together */
espi_send_vwire(espi_dev, ESPI_VWIRE_SIGNAL_SLV_BOOT_STS, 1);
espi_send_vwire(espi_dev, ESPI_VWIRE_SIGNAL_SLV_BOOT_DONE, 1);
}
}
#endif
int espi_test(void)
{
int ret;
@ -601,6 +620,26 @@ int espi_test(void)
return ret;
}
#ifndef CONFIG_ESPI_AUTOMATIC_BOOT_DONE_ACKNOWLEDGE
/* When automatic acknowledge is disabled to perform lenghty operations
* in the eSPI slave, need to explicitly send slave boot
*/
bool vw_ch_sts;
/* Simulate lenghty operation during boot */
k_sleep(K_SECONDS(2));
do {
vw_ch_sts = espi_get_channel_status(espi_dev,
ESPI_CHANNEL_VWIRE);
k_busy_wait(100);
} while (!vw_ch_sts);
send_slave_bootdone();
#endif
#ifdef CONFIG_ESPI_FLASH_CHANNEL
/* Flash operation need to be perform before VW handshake or
* after eSPI host completes full initialization.