linux-kernel - [PATCH 3/5] net: ethernet: ti: cpsw_ale: Add cpsw_ale

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Date:   Fri,  4 Nov 2022 15:23:08 +0200
From:   Roger Quadros <rogerq@...nel.org>
To:     davem@...emloft.net
Cc:     edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        vigneshr@...com, vibhore@...com, srk@...com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Roger Quadros <rogerq@...nel.org>
Subject: [PATCH 3/5] net: ethernet: ti: cpsw_ale: Add cpsw_ale_restore() helper

This can be used by device driver to restore ALE context.
The data produced by cpsw_ale_dump() can be passed to
cpsw_ale_restore().

This is required as on certain platforms the ALE context
is lost on low power suspend/resume.

Signed-off-by: Roger Quadros <rogerq@...nel.org>
---
 drivers/net/ethernet/ti/cpsw_ale.c | 10 ++++++++++
 drivers/net/ethernet/ti/cpsw_ale.h |  1 +
 2 files changed, 11 insertions(+)

diff --git a/drivers/net/ethernet/ti/cpsw_ale.c b/drivers/net/ethernet/ti/cpsw_ale.c
index 231370e9a801..0c5e783e574c 100644
--- a/drivers/net/ethernet/ti/cpsw_ale.c
+++ b/drivers/net/ethernet/ti/cpsw_ale.c
@@ -1452,6 +1452,16 @@ void cpsw_ale_dump(struct cpsw_ale *ale, u32 *data)
 	}
 }
 
+void cpsw_ale_restore(struct cpsw_ale *ale, u32 *data)
+{
+	int i;
+
+	for (i = 0; i < ale->params.ale_entries; i++) {
+		cpsw_ale_write(ale, i, data);
+		data += ALE_ENTRY_WORDS;
+	}
+}
+
 u32 cpsw_ale_get_num_entries(struct cpsw_ale *ale)
 {
 	return ale ? ale->params.ale_entries : 0;
diff --git a/drivers/net/ethernet/ti/cpsw_ale.h b/drivers/net/ethernet/ti/cpsw_ale.h
index aba4572cfa3b..6779ee111d57 100644
--- a/drivers/net/ethernet/ti/cpsw_ale.h
+++ b/drivers/net/ethernet/ti/cpsw_ale.h
@@ -127,6 +127,7 @@ int cpsw_ale_control_get(struct cpsw_ale *ale, int port, int control);
 int cpsw_ale_control_set(struct cpsw_ale *ale, int port,
 			 int control, int value);
 void cpsw_ale_dump(struct cpsw_ale *ale, u32 *data);
+void cpsw_ale_restore(struct cpsw_ale *ale, u32 *data);
 u32 cpsw_ale_get_num_entries(struct cpsw_ale *ale);
 
 static inline int cpsw_ale_get_vlan_p0_untag(struct cpsw_ale *ale, u16 vid)
-- 
2.17.1