[RFC PATCH 04/16] net: ti: icssg: Add icssg queues APIs and macros

[MD Danish Anwar]

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

Signed-off-by: MD Danish Anwar <danishanwar at ti.com>
---
 drivers/net/ti/icssg_prueth.h |  5 ++++
 drivers/net/ti/icssg_queues.c | 51 +++++++++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+)
 create mode 100644 drivers/net/ti/icssg_queues.c

diff --git a/drivers/net/ti/icssg_prueth.h b/drivers/net/ti/icssg_prueth.h
index 26b77dd8f3..f34ab5d6d4 100644
--- a/drivers/net/ti/icssg_prueth.h
+++ b/drivers/net/ti/icssg_prueth.h
@@ -75,4 +75,9 @@ void icssg_config_ipg(struct prueth *prueth, int speed, int mii);
 int icssg_config(struct prueth *prueth);
 int emac_set_port_state(struct prueth *prueth, enum icssg_port_state_cmd cmd);
 
+/* Buffer queue helpers */
+int icssg_queue_pop(struct prueth *prueth, u8 queue);
+void icssg_queue_push(struct prueth *prueth, int queue, u16 addr);
+u32 icssg_queue_level(struct prueth *prueth, int queue);
+
 #endif /* __NET_TI_ICSSG_PRUETH_H */
diff --git a/drivers/net/ti/icssg_queues.c b/drivers/net/ti/icssg_queues.c
new file mode 100644
index 0000000000..6a95ef5d58
--- /dev/null
+++ b/drivers/net/ti/icssg_queues.c
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0
+/* ICSSG Buffer queue helpers
+ *
+ * Copyright (C) 2021 Texas Instruments Incorporated - https://www.ti.com
+ */
+
+#include <dm/ofnode.h>
+#include <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 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 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);
+}
+
+u32 icssg_queue_level(struct prueth *prueth, int queue)
+{
+	u32 reg;
+
+	if (queue >= ICSSG_QUEUES_MAX)
+		return 0;
+
+	regmap_read(prueth->miig_rt, ICSSG_QUEUE_CNT_OFFSET + 4 * queue, &reg);
+
+	return reg;
+}
-- 
2.34.1