[PATCH v11 2/7] drm/xe/xe_sysctrl: Add System Controller mailbox register definitions

["Anoop, Vijay" <anoop.c.vijay@intel.com>]

From: Anoop Vijay <anoop.c.vijay@intel.com>

Add register definitions for System Controller mailbox interface,
including control, data, and protocol-related fields, along with base
address and BAR configuration required by the driver.

No functional changes. This patch introduces register definitions only.

Signed-off-by: Anoop Vijay <anoop.c.vijay@intel.com>
Reviewed-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
---
v4: (Matt)
- Use lowercase hex values
- Align macro definitions to column 49
- Change to relative register offsets

v6: (Matt)
- Move protocol constants to xe_sysctrl_mailbox_types.h
- Add SYSCTRL_MB_CTRL_MKHI_CMD helper macro

v9: (Umesh, Badal)
- Normalized hexadecimal literal casing
- Renamed MKHI to SCHI (System Controller Host Interface)

v10: (Riana, Badal)
- Removed SCHI terminology and aligned to sysctrl mailbox naming
---
 drivers/gpu/drm/xe/regs/xe_sysctrl_regs.h | 36 +++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 drivers/gpu/drm/xe/regs/xe_sysctrl_regs.h

diff --git a/drivers/gpu/drm/xe/regs/xe_sysctrl_regs.h b/drivers/gpu/drm/xe/regs/xe_sysctrl_regs.h
new file mode 100644
index 000000000000..59f3f3ec59a6
--- /dev/null
+++ b/drivers/gpu/drm/xe/regs/xe_sysctrl_regs.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2026 Intel Corporation
+ */
+
+#ifndef _XE_SYSCTRL_REGS_H_
+#define _XE_SYSCTRL_REGS_H_
+
+#include "xe_regs.h"
+
+#define SYSCTRL_BASE_OFFSET			0xdb000
+#define SYSCTRL_BASE				(SOC_BASE + SYSCTRL_BASE_OFFSET)
+#define SYSCTRL_MAILBOX_INDEX			0x03
+#define SYSCTRL_BAR_LENGTH			0x1000
+
+#define SYSCTRL_MB_CTRL				XE_REG(0x10)
+#define   SYSCTRL_MB_CTRL_RUN_BUSY		REG_BIT(31)
+#define   SYSCTRL_MB_CTRL_IRQ			REG_BIT(30)
+#define   SYSCTRL_MB_CTRL_RUN_BUSY_OUT		REG_BIT(29)
+#define   SYSCTRL_MB_CTRL_PARAM3_MASK		REG_GENMASK(28, 24)
+#define   SYSCTRL_MB_CTRL_PARAM2_MASK		REG_GENMASK(23, 16)
+#define   SYSCTRL_MB_CTRL_PARAM1_MASK		REG_GENMASK(15, 8)
+#define   SYSCTRL_MB_CTRL_COMMAND_MASK		REG_GENMASK(7, 0)
+#define   SYSCTRL_MB_CTRL_CMD			REG_FIELD_PREP(SYSCTRL_MB_CTRL_COMMAND_MASK, 5)
+
+#define SYSCTRL_MB_DATA0			XE_REG(0x14)
+#define SYSCTRL_MB_DATA1			XE_REG(0x18)
+#define SYSCTRL_MB_DATA2			XE_REG(0x1c)
+#define SYSCTRL_MB_DATA3			XE_REG(0x20)
+
+#define SYSCTRL_FRAME_PHASE			REG_BIT(24)
+#define SYSCTRL_FRAME_CURRENT_MASK		REG_GENMASK(21, 16)
+#define SYSCTRL_FRAME_TOTAL_MASK		REG_GENMASK(13, 8)
+#define SYSCTRL_FRAME_COMMAND_MASK		REG_GENMASK(7, 0)
+
+#endif
-- 
2.43.0