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From:   Sandor Yu <Sandor.yu@nxp.com>
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Cc:     kernel@pengutronix.de, linux-imx@nxp.com, Sandor.yu@nxp.com,
        oliver.brown@nxp.com, alexander.stein@ew.tq-group.com,
        sam@ravnborg.org
Subject: [PATCH v7 1/7] drm: bridge: Cadence: convert mailbox functions to macro functions
Date:   Mon, 17 Jul 2023 16:03:47 +0800
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MHDP8546 mailbox access functions will be share to other mhdp driver
and Cadence HDP-TX HDMI/DP PHY drivers.
Move those functions to head file include/drm/bridge/cdns-mhdp-mailbox.h
and convert them to macro functions.

Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
---
 .../drm/bridge/cadence/cdns-mhdp8546-core.c   | 195 +-------------
 .../drm/bridge/cadence/cdns-mhdp8546-core.h   |   1 -
 include/drm/bridge/cdns-mhdp-mailbox.h        | 240 ++++++++++++++++++
 3 files changed, 241 insertions(+), 195 deletions(-)
 create mode 100644 include/drm/bridge/cdns-mhdp-mailbox.h

diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
index f6822dfa3805..ddd3c633c7bf 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
@@ -36,6 +36,7 @@
 #include <linux/slab.h>
 #include <linux/wait.h>
 
+#include <drm/bridge/cdns-mhdp-mailbox.h>
 #include <drm/display/drm_dp_helper.h>
 #include <drm/display/drm_hdcp_helper.h>
 #include <drm/drm_atomic.h>
@@ -54,200 +55,6 @@
 #include "cdns-mhdp8546-hdcp.h"
 #include "cdns-mhdp8546-j721e.h"
 
-static int cdns_mhdp_mailbox_read(struct cdns_mhdp_device *mhdp)
-{
-	int ret, empty;
-
-	WARN_ON(!mutex_is_locked(&mhdp->mbox_mutex));
-
-	ret = readx_poll_timeout(readl, mhdp->regs + CDNS_MAILBOX_EMPTY,
-				 empty, !empty, MAILBOX_RETRY_US,
-				 MAILBOX_TIMEOUT_US);
-	if (ret < 0)
-		return ret;
-
-	return readl(mhdp->regs + CDNS_MAILBOX_RX_DATA) & 0xff;
-}
-
-static int cdns_mhdp_mailbox_write(struct cdns_mhdp_device *mhdp, u8 val)
-{
-	int ret, full;
-
-	WARN_ON(!mutex_is_locked(&mhdp->mbox_mutex));
-
-	ret = readx_poll_timeout(readl, mhdp->regs + CDNS_MAILBOX_FULL,
-				 full, !full, MAILBOX_RETRY_US,
-				 MAILBOX_TIMEOUT_US);
-	if (ret < 0)
-		return ret;
-
-	writel(val, mhdp->regs + CDNS_MAILBOX_TX_DATA);
-
-	return 0;
-}
-
-static int cdns_mhdp_mailbox_recv_header(struct cdns_mhdp_device *mhdp,
-					 u8 module_id, u8 opcode,
-					 u16 req_size)
-{
-	u32 mbox_size, i;
-	u8 header[4];
-	int ret;
-
-	/* read the header of the message */
-	for (i = 0; i < sizeof(header); i++) {
-		ret = cdns_mhdp_mailbox_read(mhdp);
-		if (ret < 0)
-			return ret;
-
-		header[i] = ret;
-	}
-
-	mbox_size = get_unaligned_be16(header + 2);
-
-	if (opcode != header[0] || module_id != header[1] ||
-	    req_size != mbox_size) {
-		/*
-		 * If the message in mailbox is not what we want, we need to
-		 * clear the mailbox by reading its contents.
-		 */
-		for (i = 0; i < mbox_size; i++)
-			if (cdns_mhdp_mailbox_read(mhdp) < 0)
-				break;
-
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-static int cdns_mhdp_mailbox_recv_data(struct cdns_mhdp_device *mhdp,
-				       u8 *buff, u16 buff_size)
-{
-	u32 i;
-	int ret;
-
-	for (i = 0; i < buff_size; i++) {
-		ret = cdns_mhdp_mailbox_read(mhdp);
-		if (ret < 0)
-			return ret;
-
-		buff[i] = ret;
-	}
-
-	return 0;
-}
-
-static int cdns_mhdp_mailbox_send(struct cdns_mhdp_device *mhdp, u8 module_id,
-				  u8 opcode, u16 size, u8 *message)
-{
-	u8 header[4];
-	int ret, i;
-
-	header[0] = opcode;
-	header[1] = module_id;
-	put_unaligned_be16(size, header + 2);
-
-	for (i = 0; i < sizeof(header); i++) {
-		ret = cdns_mhdp_mailbox_write(mhdp, header[i]);
-		if (ret)
-			return ret;
-	}
-
-	for (i = 0; i < size; i++) {
-		ret = cdns_mhdp_mailbox_write(mhdp, message[i]);
-		if (ret)
-			return ret;
-	}
-
-	return 0;
-}
-
-static
-int cdns_mhdp_reg_read(struct cdns_mhdp_device *mhdp, u32 addr, u32 *value)
-{
-	u8 msg[4], resp[8];
-	int ret;
-
-	put_unaligned_be32(addr, msg);
-
-	mutex_lock(&mhdp->mbox_mutex);
-
-	ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_GENERAL,
-				     GENERAL_REGISTER_READ,
-				     sizeof(msg), msg);
-	if (ret)
-		goto out;
-
-	ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_GENERAL,
-					    GENERAL_REGISTER_READ,
-					    sizeof(resp));
-	if (ret)
-		goto out;
-
-	ret = cdns_mhdp_mailbox_recv_data(mhdp, resp, sizeof(resp));
-	if (ret)
-		goto out;
-
-	/* Returned address value should be the same as requested */
-	if (memcmp(msg, resp, sizeof(msg))) {
-		ret = -EINVAL;
-		goto out;
-	}
-
-	*value = get_unaligned_be32(resp + 4);
-
-out:
-	mutex_unlock(&mhdp->mbox_mutex);
-	if (ret) {
-		dev_err(mhdp->dev, "Failed to read register\n");
-		*value = 0;
-	}
-
-	return ret;
-}
-
-static
-int cdns_mhdp_reg_write(struct cdns_mhdp_device *mhdp, u16 addr, u32 val)
-{
-	u8 msg[6];
-	int ret;
-
-	put_unaligned_be16(addr, msg);
-	put_unaligned_be32(val, msg + 2);
-
-	mutex_lock(&mhdp->mbox_mutex);
-
-	ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
-				     DPTX_WRITE_REGISTER, sizeof(msg), msg);
-
-	mutex_unlock(&mhdp->mbox_mutex);
-
-	return ret;
-}
-
-static
-int cdns_mhdp_reg_write_bit(struct cdns_mhdp_device *mhdp, u16 addr,
-			    u8 start_bit, u8 bits_no, u32 val)
-{
-	u8 field[8];
-	int ret;
-
-	put_unaligned_be16(addr, field);
-	field[2] = start_bit;
-	field[3] = bits_no;
-	put_unaligned_be32(val, field + 4);
-
-	mutex_lock(&mhdp->mbox_mutex);
-
-	ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
-				     DPTX_WRITE_FIELD, sizeof(field), field);
-
-	mutex_unlock(&mhdp->mbox_mutex);
-
-	return ret;
-}
-
 static
 int cdns_mhdp_dpcd_read(struct cdns_mhdp_device *mhdp,
 			u32 addr, u8 *data, u16 len)
diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h
index bedddd510d17..10c878bf0e63 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h
+++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h
@@ -212,7 +212,6 @@ struct phy;
 #define MB_MODULE_ID_HDCP_TX			0x07
 #define MB_MODULE_ID_HDCP_RX			0x08
 #define MB_MODULE_ID_HDCP_GENERAL		0x09
-#define MB_MODULE_ID_GENERAL			0x0a
 
 /* firmware and opcodes */
 #define FW_NAME					"cadence/mhdp8546.bin"
diff --git a/include/drm/bridge/cdns-mhdp-mailbox.h b/include/drm/bridge/cdns-mhdp-mailbox.h
new file mode 100644
index 000000000000..9f551bf956a1
--- /dev/null
+++ b/include/drm/bridge/cdns-mhdp-mailbox.h
@@ -0,0 +1,240 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Cadence MHDP Firmware Access API function by Malibox.
+ *
+ * Copyright (C) 2022 NXP Semiconductor, Inc.
+ *
+ */
+#ifndef CDNS_MHDP_MAILBOX_H
+#define CDNS_MHDP_MAILBOX_H
+
+#include <asm/unaligned.h>
+#include <linux/iopoll.h>
+
+/* mailbox regs offset */
+#define CDNS_MAILBOX_FULL		0x00008
+#define CDNS_MAILBOX_EMPTY		0x0000c
+#define CDNS_MAILBOX_TX_DATA		0x00010
+#define CDNS_MAILBOX_RX_DATA		0x00014
+
+#define MAILBOX_RETRY_US		1000
+#define MAILBOX_TIMEOUT_US		2000000
+
+/* Module ID Code */
+#define MB_MODULE_ID_GENERAL		0x0A
+#define MB_MODULE_ID_DP_TX		0x01
+
+/* General Commands */
+#define GENERAL_REGISTER_WRITE		0x05
+#define GENERAL_REGISTER_READ		0x07
+
+/* DP TX Command */
+#define DPTX_WRITE_FIELD		0x08
+
+/* MHDP Firmware access functions by Mailbox */
+#define cdns_mhdp_mailbox_read(_mhdp) \
+({ \
+	int ret, empty, val; \
+\
+	WARN_ON(!mutex_is_locked(&(_mhdp)->mbox_mutex)); \
+\
+	do {  \
+		ret = readx_poll_timeout(readl, (_mhdp)->regs + CDNS_MAILBOX_EMPTY,  \
+					 empty, !empty, MAILBOX_RETRY_US,  \
+					 MAILBOX_TIMEOUT_US);  \
+		if (ret < 0)  \
+			break;  \
+\
+		val = readl((_mhdp)->regs + CDNS_MAILBOX_RX_DATA) & 0xff; \
+	} while (0);  \
+\
+	(ret < 0) ? ret : val;  \
+})
+
+#define cdns_mhdp_mailbox_write(_mhdp, _val) \
+({ \
+	int ret, full;  \
+\
+	WARN_ON(!mutex_is_locked(&(_mhdp)->mbox_mutex)); \
+\
+	do {  \
+		ret = readx_poll_timeout(readl, (_mhdp)->regs + CDNS_MAILBOX_FULL,  \
+					 full, !full, MAILBOX_RETRY_US,  \
+					 MAILBOX_TIMEOUT_US);  \
+		if (ret < 0)  \
+			break;  \
+\
+		writel((_val), (_mhdp)->regs + CDNS_MAILBOX_TX_DATA); \
+	} while (0);  \
+\
+	ret; \
+})
+
+#define  cdns_mhdp_mailbox_recv_header(_mhdp, _module_id, _opcode, _req_size) \
+({  \
+	u32 mbox_size, i;  \
+	u8 header[4];  \
+	int ret;  \
+\
+	do {  \
+		/* read the header of the message */ \
+		for (i = 0; i < sizeof(header); i++) {  \
+			ret = cdns_mhdp_mailbox_read(_mhdp);  \
+			if (ret < 0)  \
+				break;  \
+\
+			header[i] = ret;  \
+		}  \
+\
+		mbox_size = get_unaligned_be16(header + 2);  \
+\
+		if ((_opcode) != header[0] || (_module_id) != header[1] ||  \
+		    (_req_size) != mbox_size) {  \
+			/* If the message in mailbox is not what we want, we need to
+			 * clear the mailbox by reading its contents. */  \
+			for (i = 0; i < mbox_size; i++)   \
+				if (cdns_mhdp_mailbox_read(_mhdp) < 0)  \
+					break;  \
+\
+			ret = -EINVAL;  \
+		}  \
+\
+		ret = 0; \
+\
+	} while (0);  \
+\
+	ret;  \
+})
+
+#define cdns_mhdp_mailbox_recv_data(_mhdp, _buff, _buff_size)  \
+({  \
+	u32 i;  \
+	int ret;  \
+\
+	do {  \
+		for (i = 0; i < (_buff_size); i++) {  \
+			ret = cdns_mhdp_mailbox_read(_mhdp);  \
+			if (ret < 0)  \
+				break;  \
+\
+			((u8 *)_buff)[i] = ret;  \
+		}  \
+\
+		ret = 0;  \
+\
+	} while (0);  \
+\
+	ret; \
+})
+
+#define cdns_mhdp_mailbox_send(_mhdp, _module_id, _opcode, _size, _message)  \
+({  \
+	u8 header[4];  \
+	int ret, i;  \
+\
+	header[0] = _opcode;  \
+	header[1] = _module_id;  \
+	put_unaligned_be16(_size, header + 2);  \
+\
+	do {  \
+		for (i = 0; i < sizeof(header); i++) {  \
+			ret = cdns_mhdp_mailbox_write(_mhdp, header[i]);  \
+			if (ret < 0)  \
+				break;  \
+		}  \
+\
+		for (i = 0; i < _size; i++) {  \
+			ret = cdns_mhdp_mailbox_write(_mhdp, ((u8 *)_message)[i]);  \
+			if (ret < 0)  \
+				break;;  \
+		}  \
+		ret = 0;  \
+	} while (0);  \
+\
+	ret;  \
+})
+
+#define cdns_mhdp_reg_read(_mhdp, _addr, _value)  \
+({  \
+	u8 msg[4], resp[8];  \
+	int ret;  \
+\
+	put_unaligned_be32(_addr, msg);  \
+\
+	mutex_lock(&(_mhdp)->mbox_mutex);  \
+\
+	do {  \
+		ret = cdns_mhdp_mailbox_send(_mhdp, MB_MODULE_ID_GENERAL,  \
+					     GENERAL_REGISTER_READ,  \
+					     sizeof(msg), msg);  \
+		if (ret < 0)  \
+			break;  \
+\
+		ret = cdns_mhdp_mailbox_recv_header(_mhdp, MB_MODULE_ID_GENERAL,  \
+						    GENERAL_REGISTER_READ,  \
+						    sizeof(resp));  \
+		if (ret < 0)  \
+			break;  \
+\
+		ret = cdns_mhdp_mailbox_recv_data(_mhdp, resp, sizeof(resp));  \
+		if (ret < 0)  \
+			break;  \
+\
+		/* Returned address value should be the same as requested */  \
+		if (memcmp(msg, resp, sizeof(msg))) {  \
+			ret = -EINVAL;  \
+			break;  \
+		}  \
+\
+		*((u32 *)_value) = get_unaligned_be32(resp + 4);  \
+			ret = 0;  \
+	} while (0);  \
+\
+	mutex_unlock(&(_mhdp)->mbox_mutex);  \
+	if (ret < 0) {  \
+		dev_err((_mhdp)->dev, "Failed to read register\n");  \
+		*((u32 *)_value) = 0;  \
+	}  \
+\
+	ret;  \
+})
+
+#define cdns_mhdp_reg_write(_mhdp, _addr, _val)  \
+({  \
+	u8 msg[8];  \
+	int ret;  \
+\
+	put_unaligned_be32(_addr, msg);  \
+	put_unaligned_be32(_val, msg + 4);  \
+\
+	mutex_lock(&(_mhdp)->mbox_mutex);  \
+\
+	ret = cdns_mhdp_mailbox_send(_mhdp, MB_MODULE_ID_GENERAL,  \
+				      GENERAL_REGISTER_WRITE, sizeof(msg), msg);  \
+\
+	mutex_unlock(&(_mhdp)->mbox_mutex);  \
+\
+	ret;  \
+})
+
+#define cdns_mhdp_reg_write_bit(_mhdp, _addr, _start_bit, _bits_no, _val) \
+({  \
+	u8 field[8];  \
+	int ret;  \
+\
+	put_unaligned_be16(_addr, field);  \
+	field[2] = _start_bit;  \
+	field[3] = _bits_no;  \
+	put_unaligned_be32(_val, field + 4);  \
+\
+	mutex_lock(&(_mhdp)->mbox_mutex);  \
+\
+	ret = cdns_mhdp_mailbox_send((_mhdp), MB_MODULE_ID_DP_TX, \
+				     DPTX_WRITE_FIELD, sizeof(field), field);  \
+\
+	mutex_unlock(&(_mhdp)->mbox_mutex);  \
+\
+	ret; \
+})
+
+#endif
-- 
2.34.1