[PATCH v2 10/12] nova-core: sequencer: Implement basic core operations

[Joel Fernandes]

These opcodes implement various falcon-related boot operations: reset,
start, wait-for-halt.

Signed-off-by: Joel Fernandes <joelagnelf@xxxxxxxxxx>
---
 drivers/gpu/nova-core/gsp/sequencer.rs | 27 ++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/gpu/nova-core/gsp/sequencer.rs b/drivers/gpu/nova-core/gsp/sequencer.rs
index d08664044506..127b293a161c 100644
--- a/drivers/gpu/nova-core/gsp/sequencer.rs
+++ b/drivers/gpu/nova-core/gsp/sequencer.rs
@@ -49,6 +49,9 @@ pub(crate) enum GspSeqCmd {
     RegPoll(fw::GSP_SEQ_BUF_PAYLOAD_REG_POLL),
     DelayUs(fw::GSP_SEQ_BUF_PAYLOAD_DELAY_US),
     RegStore(fw::GSP_SEQ_BUF_PAYLOAD_REG_STORE),
+    CoreReset,
+    CoreStart,
+    CoreWaitForHalt,
 }
 
 impl GspSeqCmd {
@@ -75,6 +78,11 @@ pub(crate) fn from_fw_cmd(cmd: &fw::GSP_SEQUENCER_BUFFER_CMD) -> Result<Self> {
                 // SAFETY: We're using the union field that corresponds to the opCode.
                 Ok(GspSeqCmd::RegStore(unsafe { cmd.payload.regStore }))
             }
+            fw::GSP_SEQ_BUF_OPCODE_GSP_SEQ_BUF_OPCODE_CORE_RESET => Ok(GspSeqCmd::CoreReset),
+            fw::GSP_SEQ_BUF_OPCODE_GSP_SEQ_BUF_OPCODE_CORE_START => Ok(GspSeqCmd::CoreStart),
+            fw::GSP_SEQ_BUF_OPCODE_GSP_SEQ_BUF_OPCODE_CORE_WAIT_FOR_HALT => {
+                Ok(GspSeqCmd::CoreWaitForHalt)
+            }
             _ => Err(EINVAL),
         }
     }
@@ -96,6 +104,9 @@ pub(crate) fn new(data: &[u8], dev: &device::Device<device::Bound>) -> Result<Se
     pub(crate) fn size_bytes(&self) -> usize {
         let opcode_size = size_of::<fw::GSP_SEQ_BUF_OPCODE>();
         match self {
+            // Each simple command type just adds 4 bytes (opcode_size) for the header.
+            GspSeqCmd::CoreReset | GspSeqCmd::CoreStart | GspSeqCmd::CoreWaitForHalt => opcode_size,
+
             // For commands with payloads, add the payload size in bytes.
             GspSeqCmd::RegWrite(_) => opcode_size + size_of::<fw::GSP_SEQ_BUF_PAYLOAD_REG_WRITE>(),
             GspSeqCmd::RegModify(_) => {
@@ -232,6 +243,22 @@ fn run(&self, seq: &GspSequencer<'_>) -> Result {
             GspSeqCmd::RegPoll(cmd) => cmd.run(seq),
             GspSeqCmd::DelayUs(cmd) => cmd.run(seq),
             GspSeqCmd::RegStore(cmd) => cmd.run(seq),
+            GspSeqCmd::CoreReset => {
+                dev_dbg!(seq.dev, "CoreReset\n");
+                seq.gsp_falcon.reset(seq.bar)?;
+                seq.gsp_falcon.dma_reset(seq.bar);
+                Ok(())
+            }
+            GspSeqCmd::CoreStart => {
+                dev_dbg!(seq.dev, "CoreStart\n");
+                seq.gsp_falcon.start(seq.bar)?;
+                Ok(())
+            }
+            GspSeqCmd::CoreWaitForHalt => {
+                dev_dbg!(seq.dev, "CoreWaitForHalt\n");
+                seq.gsp_falcon.wait_till_halted(seq.bar)?;
+                Ok(())
+            }
         }
     }
 }
-- 
2.34.1