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drivers: i3c: npcx: add support for target reset request handling

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This patch introduces handling for the target reset request (RSTACT)
in the I3C controller.
It enables the controller to send a broadcast RSTACT command along with
the target reset pattern in a single frame.

Signed-off-by: Alvis Sun <yfsun@nuvoton.com>
This commit is contained in:
Alvis Sun 2025-05-28 14:37:29 +08:00 • committed by Benjamin Cabé
commit c2f45ca588
1 changed files with 36 additions and 3 deletions
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39
drivers/i3c/i3c_npcx.c
View file

@ -35,6 +35,7 @@ LOG_MODULE_REGISTER(npcx_i3c, CONFIG_I3C_LOG_LEVEL);
#define MCTRL_REQUEST_IBIACKNACK 3 /* Manually ACK or NACK an IBI */
#define MCTRL_REQUEST_PROCESSDAA 4 /* Starts the DAA process */
#define MCTRL_REQUEST_FORCEEXIT 6 /* Emit HDR Exit Pattern */
#define MCTRL_REQUEST_TGT_RST 6 /* Emit Target Reset Pattern */
/* Emits a START with address 7Eh when a slave pulls I3C_SDA low to request an IBI */
#define MCTRL_REQUEST_AUTOIBI 7
@ -577,6 +578,24 @@ static inline int npcx_i3c_request_hdr_exit(struct i3c_reg *inst)
return 0;
}
static inline int npcx_i3c_request_tgt_reset(struct i3c_reg *inst)
{
uint32_t val = 0;
int ret;
LOG_WRN("Send target reset pattern");
SET_FIELD(val, NPCX_I3C_MCTRL_TYPE, MCTRL_TYPE_TGT_RESTART);
SET_FIELD(val, NPCX_I3C_MCTRL_REQUEST, MCTRL_REQUEST_TGT_RST);
ret = npcx_i3c_send_request(inst, val);
if (ret != 0) {
LOG_ERR("Sending tgt reset pattern error %d", ret);
return ret;
}
return 0;
}
static inline int npcx_i3c_xfer_stop(struct i3c_reg *inst)
{
uint32_t state;
@ -1525,9 +1544,9 @@ static int npcx_i3c_do_ccc(const struct device *dev, struct i3c_ccc_payload *pay
npcx_i3c_errwarn_clear_all(inst);
xfered_len = npcx_i3c_xfer_write_fifo(inst, &payload->ccc.id, 1, payload->ccc.data_len > 0);
if (xfered_len < 0) {
ret = xfered_len;
LOG_ERR("CCC[0x%02x] %s command error (%d)", payload->ccc.id,
i3c_ccc_is_payload_broadcast(payload) ? "broadcast" : "direct", ret);
ret = xfered_len;
goto out_do_ccc;
}
@ -1539,10 +1558,10 @@ static int npcx_i3c_do_ccc(const struct device *dev, struct i3c_ccc_payload *pay
xfered_len = npcx_i3c_xfer_write_fifo(inst, payload->ccc.data,
payload->ccc.data_len, false);
if (xfered_len < 0) {
ret = xfered_len;
LOG_ERR("CCC[0x%02x] %s command payload error (%d)", payload->ccc.id,
i3c_ccc_is_payload_broadcast(payload) ? "broadcast" : "direct",
ret);
ret = xfered_len;
goto out_do_ccc;
}
@ -1577,9 +1596,9 @@ static int npcx_i3c_do_ccc(const struct device *dev, struct i3c_ccc_payload *pay
inst, tgt_payload->addr, NPCX_I3C_MCTRL_TYPE_I3C, tgt_payload->data,
tgt_payload->data_len, is_read, true, false, false);
if (xfered_len < 0) {
ret = xfered_len;
LOG_ERR("CCC[0x%02x] target payload error (%d)", payload->ccc.id,
ret);
ret = xfered_len;
goto out_do_ccc;
}
@ -1589,6 +1608,20 @@ static int npcx_i3c_do_ccc(const struct device *dev, struct i3c_ccc_payload *pay
}
}
/* Currently handle broadcast RSTACT command only */
if (payload->ccc.id == I3C_CCC_RSTACT(true)) {
/* Handle invalid or unsupported defining bytes */
if (payload->ccc.data[0] > I3C_CCC_RSTACT_VIRTUAL_TARGET_DETECT) {
LOG_ERR("Invalid or unsupported RSTACT defining byte: %#x",
payload->ccc.data[0]);
ret = -EINVAL;
goto out_do_ccc;
}
/* Emit target reset pattern */
ret = npcx_i3c_request_tgt_reset(inst);
}
out_do_ccc:
npcx_i3c_request_emit_stop(inst);