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drivers: espi_mchp_xec: Implement support for flash erase

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Flash erase is required to be done before doing flash write.

Signed-off-by: Rajavardhan Gundi <rajavardhan.gundi@intel.com>
This commit is contained in:
Rajavardhan Gundi 2020-11-14 11:52:11 +05:30 • committed by Anas Nashif
commit f387c59ad5
1 changed files with 56 additions and 0 deletions
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56
drivers/espi/espi_mchp_xec.c
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@ -26,6 +26,11 @@
/* 1s */
#define MAX_FLASH_TIMEOUT 1000ul
/* While issuing flash erase command, it should be ensured that the transfer
* length specified is non-zero.
*/
#define ESPI_FLASH_ERASE_DUMMY 0x01ul
/* OOB maximum address configuration */
#define ESPI_XEC_OOB_ADDR_MSW 0x1FFFul
#define ESPI_XEC_OOB_ADDR_LSW 0xFFFFul
@ -656,6 +661,56 @@ static int espi_xec_flash_write(const struct device *dev,
return 0;
}
static int espi_xec_flash_erase(const struct device *dev,
struct espi_flash_packet *pckt)
{
int ret;
uint32_t status;
uint32_t err_mask = MCHP_ESPI_FC_STS_IBERR |
MCHP_ESPI_FC_STS_OVRUN |
MCHP_ESPI_FC_STS_FAIL |
MCHP_ESPI_FC_STS_BADREQ;
struct espi_xec_data *data = (struct espi_xec_data *)(dev->data);
LOG_DBG("%s", __func__);
if (!(ESPI_FC_REGS->STS & MCHP_ESPI_FC_STS_CHAN_EN)) {
LOG_ERR("Flash channel is disabled");
return -EIO;
}
if ((ESPI_FC_REGS->CFG & MCHP_ESPI_FC_CFG_BUSY)) {
LOG_ERR("Flash channel is busy");
return -EBUSY;
}
/* Clear status register */
status = ESPI_FC_REGS->STS;
ESPI_FC_REGS->STS = status;
ESPI_FC_REGS->FL_ADDR_MSW = 0;
ESPI_FC_REGS->FL_ADDR_LSW = pckt->flash_addr;
ESPI_FC_REGS->XFR_LEN = ESPI_FLASH_ERASE_DUMMY;
ESPI_FC_REGS->CTRL = MCHP_ESPI_FC_CTRL_FUNC(MCHP_ESPI_FC_CTRL_ERS0);
ESPI_FC_REGS->CTRL |= MCHP_ESPI_FC_CTRL_START;
/* Wait until ISR or timeout */
ret = k_sem_take(&data->flash_lock, K_MSEC(MAX_FLASH_TIMEOUT));
if (ret == -EAGAIN) {
LOG_ERR("%s timeout", __func__);
return -ETIMEDOUT;
}
if (ESPI_FC_REGS->STS & err_mask) {
LOG_ERR("%s err: %x", __func__, err_mask);
ESPI_FC_REGS->STS = err_mask;
return -EIO;
}
return 0;
}
static int espi_xec_manage_callback(const struct device *dev,
struct espi_callback *callback, bool set)
{
@ -1279,6 +1334,7 @@ static const struct espi_driver_api espi_xec_driver_api = {
.receive_oob = espi_xec_receive_oob,
.flash_read = espi_xec_flash_read,
.flash_write = espi_xec_flash_write,
.flash_erase = espi_xec_flash_erase,
.manage_callback = espi_xec_manage_callback,
.read_lpc_request = espi_xec_read_lpc_request,
.write_lpc_request = espi_xec_write_lpc_request,