nvlink: Implement nvlink shutdown during SC0/SC7

This change implements below nvlink shutdown steps:
* Ensure nvlink is idle and no pending transactions
* Turn off MSS Nvlink slave aperture
* Turn off MSS Nvlink core clocks
* Transition the link to SWCFG
* Transition the link to OFF
* Assert t19x nvlink resets and disable the clks

Also this change adds "shutdown" debugfs node that can
be used to shutdown t19x nvlink.

Bug 200402583
Bug 200389569

Change-Id: I7312f3c49ed643a66325b9280b392394008276d4
Signed-off-by: Suresh Mangipudi <smangipudi@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1661191
Reviewed-by: Petlozu Pravareshwar <petlozup@nvidia.com>
Tested-by: Petlozu Pravareshwar <petlozup@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: Tejal Kudav <tkudav@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/platform/tegra/tegra-nvlink.h b/include/linux/platform/tegra/tegra-nvlink.h
index a048b64ab..141bbf106 100644
--- a/include/linux/platform/tegra/tegra-nvlink.h
+++ b/include/linux/platform/tegra/tegra-nvlink.h
@@ -182,6 +182,7 @@ struct device_operations {
         int (*dev_early_init)(struct nvlink_device *ndev);
         int (*dev_interface_init)(struct nvlink_device *ndev);
         int (*dev_reg_init)(struct nvlink_device *ndev);
+        int (*dev_interface_disable)(struct nvlink_device *ndev);
         int (*dev_shutdown)(struct nvlink_device *ndev);
 };
 
@@ -283,4 +284,5 @@ int nvlink_transition_intranode_conn_off_to_safe(struct nvlink_device *ndev);
 int nvlink_train_intranode_conn_safe_to_hs(struct nvlink_device *ndev);
 int nvlink_initialize_endpoint(struct nvlink_device *ndev);
 int nvlink_transition_intranode_conn_hs_to_safe(struct nvlink_device *ndev);
+int nvlink_shutdown(struct nvlink_device *ndev);
 #endif /* TEGRA_NVLINK_H */