1 files changed, 55 insertions, 0 deletions
diff --git a/drivers/gpu/nova-core/regs.rs b/drivers/gpu/nova-core/regs.rs
new file mode 100644
index 000000000000..50aefb150b0b
--- /dev/null
+++ b/drivers/gpu/nova-core/regs.rs
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0
+
+use crate::driver::Bar0;
+
+// TODO
+//
+// Create register definitions via generic macros. See task "Generic register
+// abstraction" in Documentation/gpu/nova/core/todo.rst.
+
+const BOOT0_OFFSET: usize = 0x00000000;
+
+// 3:0 - chipset minor revision
+const BOOT0_MINOR_REV_SHIFT: u8 = 0;
+const BOOT0_MINOR_REV_MASK: u32 = 0x0000000f;
+
+// 7:4 - chipset major revision
+const BOOT0_MAJOR_REV_SHIFT: u8 = 4;
+const BOOT0_MAJOR_REV_MASK: u32 = 0x000000f0;
+
+// 23:20 - chipset implementation Identifier (depends on architecture)
+const BOOT0_IMPL_SHIFT: u8 = 20;
+const BOOT0_IMPL_MASK: u32 = 0x00f00000;
+
+// 28:24 - chipset architecture identifier
+const BOOT0_ARCH_MASK: u32 = 0x1f000000;
+
+// 28:20 - chipset identifier (virtual register field combining BOOT0_IMPL and
+//         BOOT0_ARCH)
+const BOOT0_CHIPSET_SHIFT: u8 = BOOT0_IMPL_SHIFT;
+const BOOT0_CHIPSET_MASK: u32 = BOOT0_IMPL_MASK | BOOT0_ARCH_MASK;
+
+#[derive(Copy, Clone)]
+pub(crate) struct Boot0(u32);
+
+impl Boot0 {
+    #[inline]
+    pub(crate) fn read(bar: &Bar0) -> Self {
+        Self(bar.readl(BOOT0_OFFSET))
+    }
+
+    #[inline]
+    pub(crate) fn chipset(&self) -> u32 {
+        (self.0 & BOOT0_CHIPSET_MASK) >> BOOT0_CHIPSET_SHIFT
+    }
+
+    #[inline]
+    pub(crate) fn minor_rev(&self) -> u8 {
+        ((self.0 & BOOT0_MINOR_REV_MASK) >> BOOT0_MINOR_REV_SHIFT) as u8
+    }
+
+    #[inline]
+    pub(crate) fn major_rev(&self) -> u8 {
+        ((self.0 & BOOT0_MAJOR_REV_MASK) >> BOOT0_MAJOR_REV_SHIFT) as u8
+    }
+}