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author | Lokesh Vutla <lokeshvutla@ti.com> | 2019-08-26 20:00:40 -0700 |
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committer | Arnd Bergmann <arnd@arndb.de> | 2019-09-04 20:44:33 +0200 |
commit | 45b659ee75d7bcff7d0206967d150d879f1d3eb9 (patch) | |
tree | 31c22d96ba55b2e858e240b67409c4c4a79b319f /drivers | |
parent | 3b1261fb72c7dc6a9e4604ef1ea01d6bb67cc3d1 (diff) | |
download | linux-45b659ee75d7bcff7d0206967d150d879f1d3eb9.tar.gz linux-45b659ee75d7bcff7d0206967d150d879f1d3eb9.tar.bz2 linux-45b659ee75d7bcff7d0206967d150d879f1d3eb9.zip |
firmware: ti_sci: Allow for device shared and exclusive requests
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.
Reviewed-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/firmware/ti_sci.c | 45 |
1 files changed, 43 insertions, 2 deletions
diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c index cdee0b45943d..4126be9e3216 100644 --- a/drivers/firmware/ti_sci.c +++ b/drivers/firmware/ti_sci.c @@ -635,6 +635,7 @@ fail: /** * 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 * @@ -642,12 +643,30 @@ fail: * 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, MSG_DEVICE_SW_STATE_ON); @@ -666,6 +685,26 @@ 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, 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, MSG_DEVICE_SW_STATE_RETENTION); @@ -2894,7 +2933,9 @@ 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; |