[PATCH v5 17/38] gpu: nova-core: Hopper/Blackwell: add FMC firmware image, in support of FSP

[John Hubbard <jhubbard@nvidia.com>]

FSP is a hardware unit that runs FMC firmware. The FMC ELF file is
loaded and stored in two forms: the "image" ELF section alone (which
FSP uses for boot) and the full ELF (needed later for signature
extraction during Chain of Trust verification).

Co-developed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
---
 drivers/gpu/nova-core/firmware.rs     |  1 +
 drivers/gpu/nova-core/firmware/fsp.rs | 44 +++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)
 create mode 100644 drivers/gpu/nova-core/firmware/fsp.rs

diff --git a/drivers/gpu/nova-core/firmware.rs b/drivers/gpu/nova-core/firmware.rs
index 57a919b7e0e8..396f96716d6b 100644
--- a/drivers/gpu/nova-core/firmware.rs
+++ b/drivers/gpu/nova-core/firmware.rs
@@ -28,6 +28,7 @@
 };
 
 pub(crate) mod booter;
+pub(crate) mod fsp;
 pub(crate) mod fwsec;
 pub(crate) mod gsp;
 pub(crate) mod riscv;
diff --git a/drivers/gpu/nova-core/firmware/fsp.rs b/drivers/gpu/nova-core/firmware/fsp.rs
new file mode 100644
index 000000000000..cea9532ba5ff
--- /dev/null
+++ b/drivers/gpu/nova-core/firmware/fsp.rs
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! FSP is a hardware unit that runs FMC firmware.
+
+use kernel::{
+    device,
+    prelude::*, //
+};
+
+use crate::{
+    dma::DmaObject,
+    firmware::elf,
+    gpu::Chipset, //
+};
+
+#[expect(unused)]
+pub(crate) struct FspFirmware {
+    /// FMC firmware image data (only the "image" ELF section).
+    fmc_image: DmaObject,
+    /// Full FMC ELF data (for signature extraction).
+    fmc_full: DmaObject,
+}
+
+impl FspFirmware {
+    #[expect(unused)]
+    pub(crate) fn new(
+        dev: &device::Device<device::Bound>,
+        chipset: Chipset,
+        ver: &str,
+    ) -> Result<Self> {
+        let fw = super::request_firmware(dev, chipset, "fmc", ver)?;
+
+        // FSP expects only the "image" section, not the entire ELF file.
+        let fmc_image_data = elf::elf_section(fw.data(), "image").ok_or_else(|| {
+            dev_err!(dev, "FMC ELF file missing 'image' section\n");
+            EINVAL
+        })?;
+
+        Ok(Self {
+            fmc_image: DmaObject::from_data(dev, fmc_image_data)?,
+            fmc_full: DmaObject::from_data(dev, fw.data())?,
+        })
+    }
+}
-- 
2.53.0