[U-Boot] [PATCH v3 1/9] firmware: ti_sci: Allow for device shared and exclusive requests

[Lokesh Vutla]

Sysfw provides an option for requesting exclusive access for a
device using the flags MSG_FLAG_DEVICE_EXCLUSIVE. If this flag is
not used, the device is meant to be shared across hosts. Once a device
is requested from a host with this flag set, any request to this
device from a different host will be nacked by sysfw. Current tisci
driver enables this flag for every device requests. But this may not
be true for all the devices. So provide a separate commands in driver
for exclusive and shared device requests.

Signed-off-by: Lokesh Vutla <lokeshvutla at ti.com>
---
 drivers/firmware/ti_sci.c              | 25 ++++++++++++++++++++-----
 include/linux/soc/ti/ti_sci_protocol.h |  3 +++
 2 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c
index 303aa6a631..eadb91e107 100644
--- a/drivers/firmware/ti_sci.c
+++ b/drivers/firmware/ti_sci.c
@@ -547,8 +547,14 @@ static int ti_sci_get_device_state(const struct ti_sci_handle *handle,
  */
 static int ti_sci_cmd_get_device(const struct ti_sci_handle *handle, u32 id)
 {
-	return ti_sci_set_device_state(handle, id,
-				       MSG_FLAG_DEVICE_EXCLUSIVE,
+	return ti_sci_set_device_state(handle, id, 0,
+				       MSG_DEVICE_SW_STATE_ON);
+}
+
+static int ti_sci_cmd_get_device_exclusive(const struct ti_sci_handle *handle,
+					   u32 id)
+{
+	return ti_sci_set_device_state(handle, id, MSG_FLAG_DEVICE_EXCLUSIVE,
 				       MSG_DEVICE_SW_STATE_ON);
 }
 
@@ -566,7 +572,14 @@ static int ti_sci_cmd_get_device(const struct ti_sci_handle *handle, u32 id)
 static int ti_sci_cmd_idle_device(const struct ti_sci_handle *handle, u32 id)
 {
 	return ti_sci_set_device_state(handle, id,
-				       MSG_FLAG_DEVICE_EXCLUSIVE,
+				       0,
+				       MSG_DEVICE_SW_STATE_RETENTION);
+}
+
+static int ti_sci_cmd_idle_device_exclusive(const struct ti_sci_handle *handle,
+					    u32 id)
+{
+	return ti_sci_set_device_state(handle, id, MSG_FLAG_DEVICE_EXCLUSIVE,
 				       MSG_DEVICE_SW_STATE_RETENTION);
 }
 
@@ -583,8 +596,8 @@ static int ti_sci_cmd_idle_device(const struct ti_sci_handle *handle, u32 id)
  */
 static int ti_sci_cmd_put_device(const struct ti_sci_handle *handle, u32 id)
 {
-	return ti_sci_set_device_state(handle, id,
-				       0, MSG_DEVICE_SW_STATE_AUTO_OFF);
+	return ti_sci_set_device_state(handle, id, 0,
+				       MSG_DEVICE_SW_STATE_AUTO_OFF);
 }
 
 /**
@@ -2632,7 +2645,9 @@ static void ti_sci_setup_ops(struct ti_sci_info *info)
 	bops->board_config_pm = ti_sci_cmd_set_board_config_pm;
 
 	dops->get_device = ti_sci_cmd_get_device;
+	dops->get_device_exclusive = ti_sci_cmd_get_device_exclusive;
 	dops->idle_device = ti_sci_cmd_idle_device;
+	dops->idle_device_exclusive = ti_sci_cmd_idle_device_exclusive;
 	dops->put_device = ti_sci_cmd_put_device;
 	dops->is_valid = ti_sci_cmd_dev_is_valid;
 	dops->get_context_loss_count = ti_sci_cmd_dev_get_clcnt;
diff --git a/include/linux/soc/ti/ti_sci_protocol.h b/include/linux/soc/ti/ti_sci_protocol.h
index c57802f293..842fb596f7 100644
--- a/include/linux/soc/ti/ti_sci_protocol.h
+++ b/include/linux/soc/ti/ti_sci_protocol.h
@@ -117,7 +117,10 @@ struct ti_sci_board_ops {
  */
 struct ti_sci_dev_ops {
 	int (*get_device)(const struct ti_sci_handle *handle, u32 id);
+	int (*get_device_exclusive)(const struct ti_sci_handle *handle, u32 id);
 	int (*idle_device)(const struct ti_sci_handle *handle, u32 id);
+	int (*idle_device_exclusive)(const struct ti_sci_handle *handle,
+				     u32 id);
 	int (*put_device)(const struct ti_sci_handle *handle, u32 id);
 	int (*is_valid)(const struct ti_sci_handle *handle, u32 id);
 	int (*get_context_loss_count)(const struct ti_sci_handle *handle,
-- 
2.21.0