1 files changed, 85 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/display/ext/i915_irq.c b/drivers/gpu/drm/xe/display/ext/i915_irq.c
new file mode 100644
index 000000000000..3c6bca66ddab
--- /dev/null
+++ b/drivers/gpu/drm/xe/display/ext/i915_irq.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2023 Intel Corporation
+ */
+
+#include "i915_irq.h"
+#include "i915_reg.h"
+#include "intel_uncore.h"
+
+void gen2_irq_reset(struct intel_uncore *uncore, struct i915_irq_regs regs)
+{
+	intel_uncore_write(uncore, regs.imr, 0xffffffff);
+	intel_uncore_posting_read(uncore, regs.imr);
+
+	intel_uncore_write(uncore, regs.ier, 0);
+
+	/* IIR can theoretically queue up two events. Be paranoid. */
+	intel_uncore_write(uncore, regs.iir, 0xffffffff);
+	intel_uncore_posting_read(uncore, regs.iir);
+	intel_uncore_write(uncore, regs.iir, 0xffffffff);
+	intel_uncore_posting_read(uncore, regs.iir);
+}
+
+/*
+ * We should clear IMR at preinstall/uninstall, and just check at postinstall.
+ */
+void gen2_assert_iir_is_zero(struct intel_uncore *uncore, i915_reg_t reg)
+{
+	struct xe_device *xe = container_of(uncore, struct xe_device, uncore);
+	u32 val = intel_uncore_read(uncore, reg);
+
+	if (val == 0)
+		return;
+
+	drm_WARN(&xe->drm, 1,
+		 "Interrupt register 0x%x is not zero: 0x%08x\n",
+		 i915_mmio_reg_offset(reg), val);
+	intel_uncore_write(uncore, reg, 0xffffffff);
+	intel_uncore_posting_read(uncore, reg);
+	intel_uncore_write(uncore, reg, 0xffffffff);
+	intel_uncore_posting_read(uncore, reg);
+}
+
+void gen2_irq_init(struct intel_uncore *uncore, struct i915_irq_regs regs,
+		   u32 imr_val, u32 ier_val)
+{
+	gen2_assert_iir_is_zero(uncore, regs.iir);
+
+	intel_uncore_write(uncore, regs.ier, ier_val);
+	intel_uncore_write(uncore, regs.imr, imr_val);
+	intel_uncore_posting_read(uncore, regs.imr);
+}
+
+void gen2_error_reset(struct intel_uncore *uncore, struct i915_error_regs regs)
+{
+	intel_uncore_write(uncore, regs.emr, 0xffffffff);
+	intel_uncore_posting_read(uncore, regs.emr);
+
+	intel_uncore_write(uncore, regs.eir, 0xffffffff);
+	intel_uncore_posting_read(uncore, regs.eir);
+	intel_uncore_write(uncore, regs.eir, 0xffffffff);
+	intel_uncore_posting_read(uncore, regs.eir);
+}
+
+void gen2_error_init(struct intel_uncore *uncore, struct i915_error_regs regs,
+		     u32 emr_val)
+{
+	intel_uncore_write(uncore, regs.eir, 0xffffffff);
+	intel_uncore_posting_read(uncore, regs.eir);
+	intel_uncore_write(uncore, regs.eir, 0xffffffff);
+	intel_uncore_posting_read(uncore, regs.eir);
+
+	intel_uncore_write(uncore, regs.emr, emr_val);
+	intel_uncore_posting_read(uncore, regs.emr);
+}
+
+bool intel_irqs_enabled(struct xe_device *xe)
+{
+	return atomic_read(&xe->irq.enabled);
+}
+
+void intel_synchronize_irq(struct xe_device *xe)
+{
+	synchronize_irq(to_pci_dev(xe->drm.dev)->irq);
+}