Sysfw provides an option for requesting exclusive access for a
device using the flags MSG_FLAG_DEVICE_EXCLUSIVE. 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 command in driver
for exclusive and non-exclusive device requests.
Signed-off-by: Lokesh Vutla <lokeshvutla@xxxxxx>
---
drivers/firmware/ti_sci.c | 45 ++++++++++++++++++++++++--
include/linux/soc/ti/ti_sci_protocol.h | 3 ++
2 files changed, 46 insertions(+), 2 deletions(-)
diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c
index 69ed1464175c..8c6f21ceb6f2 100644
--- a/drivers/firmware/ti_sci.c
+++ b/drivers/firmware/ti_sci.c
@@ -634,6 +634,7 @@ static int ti_sci_get_device_state(const struct ti_sci_handle *handle,
/**
* ti_sci_cmd_get_device() - command to request for device managed by TISCI
+ * that can be shared with other hosts.
* @handle: Pointer to TISCI handle as retrieved by *ti_sci_get_handle
* @id: Device Identifier
*
@@ -641,11 +642,29 @@ static int ti_sci_get_device_state(const struct ti_sci_handle *handle,
* usage count by balancing get_device with put_device. No refcounting is
* managed by driver for that purpose.
*
- * NOTE: The request is for exclusive access for the processor.
- *
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_get_device(const struct ti_sci_handle *handle, u32 id)
+{
+ return ti_sci_set_device_state(handle, id, 0,
+ MSG_DEVICE_SW_STATE_ON);
+}
+
+/**
+ * ti_sci_cmd_get_device_exclusive() - command to request for device managed by
+ * TISCI that is exclusively owned by the
+ * requesting host.
+ * @handle: Pointer to TISCI handle as retrieved by *ti_sci_get_handle
+ * @id: Device Identifier
+ *
+ * Request for the device - NOTE: the client MUST maintain integrity of
+ * usage count by balancing get_device with put_device. No refcounting is
+ * managed by driver for that purpose.
+ *
+ * Return: 0 if all went fine, else return appropriate error.
+ */
+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,
@@ -664,6 +683,26 @@ static int ti_sci_cmd_get_device(const struct ti_sci_handle *handle, u32 id)
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_idle_device(const struct ti_sci_handle *handle, u32 id)
+{
+ return ti_sci_set_device_state(handle, id, 0,
+ MSG_DEVICE_SW_STATE_RETENTION);
+}
+
+/**
+ * ti_sci_cmd_idle_device_exclusive() - Command to idle a device managed by
+ * TISCI that is exclusively owned by
+ * requesting host.
+ * @handle: Pointer to TISCI handle as retrieved by *ti_sci_get_handle
+ * @id: Device Identifier
+ *
+ * Request for the device - NOTE: the client MUST maintain integrity of
+ * usage count by balancing get_device with put_device. No refcounting is
+ * managed by driver for that purpose.
+ *
+ * Return: 0 if all went fine, else return appropriate error.
+ */
+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,
@@ -1631,7 +1670,9 @@ static void ti_sci_setup_ops(struct ti_sci_info *info)
core_ops->reboot_device = ti_sci_cmd_core_reboot;
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;
diff --git a/include/linux/soc/ti/ti_sci_protocol.h b/include/linux/soc/ti/ti_sci_protocol.h
index 18435e5c6364..5d704bb33989 100644
--- a/include/linux/soc/ti/ti_sci_protocol.h
+++ b/include/linux/soc/ti/ti_sci_protocol.h
@@ -97,7 +97,10 @@ struct ti_sci_core_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,
--
2.19.2
