[PATCH v12 04/10] net: ti: icssg-prueth: Add icssg queues APIs and macros

[MD Danish Anwar <danishanwar@ti.com>]

Add icssg_queue.c file. This file introduces macros and APIs related to
ICSSG queues. These will be used by ICSSG Ethernet driver.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: MD Danish Anwar <danishanwar@ti.com>
---
 drivers/net/ethernet/ti/icssg/icssg_queues.c | 38 ++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 drivers/net/ethernet/ti/icssg/icssg_queues.c

diff --git a/drivers/net/ethernet/ti/icssg/icssg_queues.c b/drivers/net/ethernet/ti/icssg/icssg_queues.c
new file mode 100644
index 000000000000..2e3f7db43db7
--- /dev/null
+++ b/drivers/net/ethernet/ti/icssg/icssg_queues.c
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0
+/* ICSSG Buffer queue helpers
+ *
+ * Copyright (C) 2021 Texas Instruments Incorporated - https://www.ti.com
+ */
+
+#include <linux/regmap.h>
+#include "icssg_prueth.h"
+
+#define ICSSG_QUEUES_MAX		64
+#define ICSSG_QUEUE_OFFSET		0xd00
+#define ICSSG_QUEUE_PEEK_OFFSET		0xe00
+#define ICSSG_QUEUE_CNT_OFFSET		0xe40
+#define	ICSSG_QUEUE_RESET_OFFSET	0xf40
+
+int __maybe_unused icssg_queue_pop(struct prueth *prueth, u8 queue)
+{
+	u32 val, cnt;
+
+	if (queue >= ICSSG_QUEUES_MAX)
+		return -EINVAL;
+
+	regmap_read(prueth->miig_rt, ICSSG_QUEUE_CNT_OFFSET + 4 * queue, &cnt);
+	if (!cnt)
+		return -EINVAL;
+
+	regmap_read(prueth->miig_rt, ICSSG_QUEUE_OFFSET + 4 * queue, &val);
+
+	return val;
+}
+
+void __maybe_unused icssg_queue_push(struct prueth *prueth, int queue, u16 addr)
+{
+	if (queue >= ICSSG_QUEUES_MAX)
+		return;
+
+	regmap_write(prueth->miig_rt, ICSSG_QUEUE_OFFSET + 4 * queue, addr);
+}
-- 
2.34.1