linux-kernel - [PATCH v2 1/4] ACPI: PCC: Add PCC shared memory region command and status bitfields

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Message-Id: <20230927-pcc_defines-v2-1-0b8ffeaef2e5@arm.com>
Date:   Wed, 27 Sep 2023 17:26:10 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-acpi@...r.kernel.org
Cc:     Sudeep Holla <sudeep.holla@....com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Andi Shyti <andi.shyti@...nel.org>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Huisong Li <lihuisong@...wei.com>
Subject: [PATCH v2 1/4] ACPI: PCC: Add PCC shared memory region command and
 status bitfields

Define the common macros to use when referring to various bitfields in
the PCC generic communications channel command and status fields.

Currently different drivers that need to use these bitfields have defined
these locally. This common macro is intended to consolidate and replace
those.

Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
 include/acpi/pcc.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/acpi/pcc.h b/include/acpi/pcc.h
index 73e806fe7ce7..021891a7434f 100644
--- a/include/acpi/pcc.h
+++ b/include/acpi/pcc.h
@@ -18,7 +18,20 @@ struct pcc_mbox_chan {
 	u16 min_turnaround_time;
 };
 
+/* Generic Communications Channel Shared Memory Region */
+#define PCC_SIGNATURE			0x50424300
+/* Generic Communications Channel Command Field */
+#define PCC_CMD_GENERATE_DB_INTR	BIT(15)
+/* Generic Communications Channel Status Field */
+#define PCC_STATUS_CMD_COMPLETE		BIT(0)
+#define PCC_STATUS_SCI_DOORBELL		BIT(1)
+#define PCC_STATUS_ERROR		BIT(2)
+#define PCC_STATUS_PLATFORM_NOTIFY	BIT(3)
+/* Initiator Responder Communications Channel Flags */
+#define PCC_CMD_COMPLETION_NOTIFY	BIT(0)
+
 #define MAX_PCC_SUBSPACES	256
+
 #ifdef CONFIG_PCC
 extern struct pcc_mbox_chan *
 pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id);

-- 
2.42.0