[PATCH v9 14/15] gpu: nova-core: falcon: Add support to write firmware version

[Alexandre Courbot <acourbot@nvidia.com>]

From: Joel Fernandes <joelagnelf@nvidia.com>

This will be needed by both the GSP boot code as well as GSP resume code
in the sequencer.

Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
---
 drivers/gpu/nova-core/falcon.rs | 8 ++++++++
 drivers/gpu/nova-core/regs.rs   | 6 ++++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/gpu/nova-core/falcon.rs b/drivers/gpu/nova-core/falcon.rs
index 4c1f36073533..31904e1d804b 100644
--- a/drivers/gpu/nova-core/falcon.rs
+++ b/drivers/gpu/nova-core/falcon.rs
@@ -621,4 +621,12 @@ pub(crate) fn is_riscv_active(&self, bar: &Bar0) -> bool {
         let cpuctl = regs::NV_PRISCV_RISCV_CPUCTL::read(bar, &E::ID);
         cpuctl.active_stat()
     }
+
+    /// Write the application version to the OS register.
+    #[expect(dead_code)]
+    pub(crate) fn write_os_version(&self, bar: &Bar0, app_version: u32) {
+        regs::NV_PFALCON_FALCON_OS::default()
+            .set_value(app_version)
+            .write(bar, &E::ID);
+    }
 }
diff --git a/drivers/gpu/nova-core/regs.rs b/drivers/gpu/nova-core/regs.rs
index 5d5ba766cd61..274e53a1a44d 100644
--- a/drivers/gpu/nova-core/regs.rs
+++ b/drivers/gpu/nova-core/regs.rs
@@ -230,6 +230,12 @@ pub(crate) fn vga_workspace_addr(self) -> Option<u64> {
     31:0    value as u32;
 });
 
+// Used to store version information about the firmware running
+// on the Falcon processor.
+register!(NV_PFALCON_FALCON_OS @ PFalconBase[0x00000080] {
+    31:0    value as u32;
+});
+
 register!(NV_PFALCON_FALCON_RM @ PFalconBase[0x00000084] {
     31:0    value as u32;
 });

-- 
2.51.2