[U-Boot] [PATCH 1/8] firmware: ti_sci: Allow for device shared and exclusive requests
Lokesh Vutla
lokeshvutla at ti.com
Wed May 22 04:27:06 UTC 2019
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,
--
2.17.1
More information about the U-Boot
mailing list