tegra: safety-ivc: Add support for HB CMD

Why?
L2SS expects a heartbeat ping every 40ms. CCPLEX is
expected to write the Boot status in the IVC channel
for the first time and the consective pings will be
just to send Alive check.

How?
Create a new callback API for the HB command which
fills the bit fields for the HB data and sends it over
the cmd-resp IVC channel.

* Added mutex lock support for l1ss_cmd_resp_send_frame
  for syncronizing the ivc writes.
* Waiting for empty interrupts hogs the system. Time
  critical features such as HB fail while waiting for
  empty interrupts. Hence, removing the HSP SM empty isr
  support.

Bug 200700400

Change-Id: I7f124c9f7336df9d387536aa3f2dda80d9234db8
Signed-off-by: Mantravadi Karthik <mkarthik@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2519655
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/tegra-safety-ivc.h b/include/linux/tegra-safety-ivc.h
index 9c43f271b..fce08c62c 100644
--- a/include/linux/tegra-safety-ivc.h
+++ b/include/linux/tegra-safety-ivc.h
@@ -22,6 +22,8 @@
 #define SAFETY_CONF(id, value)          ((SAFETY_CONF_ ## id << 24) | (value))
 #define SAFETY_CONF_GET_ID(value)       (((value) >> 24) & 0x7f)
 #define SAFETY_CONF_GET_VALUE(value)    ((value) & 0xffffff)
+#define TEGRA_SAFETY_SM_CMDRESP_CH     0
+#define TEGRA_SAFETY_IVC_READ_TIMEOUT   (2 * HZ)
 
 enum {
         SAFETY_CONF_IVC_READY = 1,
@@ -49,6 +51,10 @@ struct tegra_safety_ivc {
         } cmd;
         struct tegra_safety_ivc_chan *ivc_chan[MAX_SAFETY_CHANNELS];
         atomic_t ivc_ready;
+        struct work_struct work;
+        struct workqueue_struct *wq;
+        struct mutex rlock;
+        struct mutex wlock;
         struct l1ss_data *ldata;
 };