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From: Roger Quadros <rogerq@kernel.org>
Date: Thu, 06 Jun 2024 15:09:19 +0300
Subject: [PATCH RFC net-next 3/7] net: ethernet: ti: cpsw_ale: use
 regfields for number of Entries and Policers
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Message-Id: <20240606-am65-cpsw-multi-rx-v1-3-0704b0cb6fdc@kernel.org>
References: <20240606-am65-cpsw-multi-rx-v1-0-0704b0cb6fdc@kernel.org>
In-Reply-To: <20240606-am65-cpsw-multi-rx-v1-0-0704b0cb6fdc@kernel.org>
To: "David S. Miller" <davem@davemloft.net>, 
 Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, 
 Paolo Abeni <pabeni@redhat.com>, Siddharth Vadapalli <s-vadapalli@ti.com>
Cc: Andrew Lunn <andrew@lunn.ch>, srk@ti.com, vigneshr@ti.com, 
 danishanwar@ti.com, pekka Varis <p-varis@ti.com>, netdev@vger.kernel.org, 
 linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, 
 Roger Quadros <rogerq@kernel.org>

Use regfields for number of ALE Entries and Policers.

The variants that support Policers/Classifiers have the number
of policers encoded in the ALE_STATUS register.

Use that and show the number of Policers in the ALE info message.

Signed-off-by: Roger Quadros <rogerq@kernel.org>
---
 drivers/net/ethernet/ti/cpsw_ale.c | 25 +++++++++++++++++++------
 drivers/net/ethernet/ti/cpsw_ale.h |  3 +++
 2 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/ti/cpsw_ale.c b/drivers/net/ethernet/ti/cpsw_ale.c
index 5afe9fdd6402..07a60e9eafbd 100644
--- a/drivers/net/ethernet/ti/cpsw_ale.c
+++ b/drivers/net/ethernet/ti/cpsw_ale.c
@@ -103,7 +103,7 @@ struct cpsw_ale_dev_id {
 #define ALE_UCAST_TOUCHED		3
 
 #define ALE_TABLE_SIZE_MULTIPLIER	1024
-#define ALE_STATUS_SIZE_MASK		0x1f
+#define ALE_POLICER_SIZE_MULTIPLIER	8
 
 static inline int cpsw_ale_get_field(u32 *ale_entry, u32 start, u32 bits)
 {
@@ -1303,6 +1303,9 @@ static const struct reg_field ale_fields_cpsw_nu[] = {
 	/* CPSW_ALE_IDVER_REG */
 	[MINOR_VER]	= REG_FIELD(ALE_IDVER, 0, 7),
 	[MAJOR_VER]	= REG_FIELD(ALE_IDVER, 8, 10),
+	/* CPSW_ALE_STATUS_REG */
+	[ENTRIES]	= REG_FIELD(ALE_STATUS, 0, 7),
+	[POLICERS]	= REG_FIELD(ALE_STATUS, 8, 15),
 };
 
 static const struct cpsw_ale_dev_id cpsw_ale_id_match[] = {
@@ -1404,7 +1407,7 @@ struct cpsw_ale *cpsw_ale_create(struct cpsw_ale_params *params)
 {
 	const struct cpsw_ale_dev_id *ale_dev_id;
 	struct cpsw_ale *ale;
-	u32 ale_entries, rev_major, rev_minor;
+	u32 ale_entries, rev_major, rev_minor, policers;
 	int ret;
 
 	ale_dev_id = cpsw_ale_match_id(cpsw_ale_id_match, params->dev_id);
@@ -1446,9 +1449,7 @@ struct cpsw_ale *cpsw_ale_create(struct cpsw_ale_params *params)
 
 	if (ale->features & CPSW_ALE_F_STATUS_REG &&
 	    !ale->params.ale_entries) {
-		ale_entries =
-			readl_relaxed(ale->params.ale_regs + ALE_STATUS) &
-			ALE_STATUS_SIZE_MASK;
+		regmap_field_read(ale->fields[ENTRIES], &ale_entries);
 		/* ALE available on newer NetCP switches has introduced
 		 * a register, ALE_STATUS, to indicate the size of ALE
 		 * table which shows the size as a multiple of 1024 entries.
@@ -1462,8 +1463,20 @@ struct cpsw_ale *cpsw_ale_create(struct cpsw_ale_params *params)
 		ale_entries *= ALE_TABLE_SIZE_MULTIPLIER;
 		ale->params.ale_entries = ale_entries;
 	}
+
+	if (ale->features & CPSW_ALE_F_STATUS_REG &&
+	    !ale->params.num_policers) {
+		regmap_field_read(ale->fields[POLICERS], &policers);
+		if (!policers)
+			return ERR_PTR(-EINVAL);
+
+		policers *= ALE_POLICER_SIZE_MULTIPLIER;
+		ale->params.num_policers = policers;
+	}
+
 	dev_info(ale->params.dev,
-		 "ALE Table size %ld\n", ale->params.ale_entries);
+		 "ALE Table size %ld, Policers %ld\n", ale->params.ale_entries,
+		 ale->params.num_policers);
 
 	/* set default bits for existing h/w */
 	ale->port_mask_bits = ale->params.ale_ports;
diff --git a/drivers/net/ethernet/ti/cpsw_ale.h b/drivers/net/ethernet/ti/cpsw_ale.h
index 58d377dd7496..bcbaaa7a1bca 100644
--- a/drivers/net/ethernet/ti/cpsw_ale.h
+++ b/drivers/net/ethernet/ti/cpsw_ale.h
@@ -15,6 +15,7 @@ struct cpsw_ale_params {
 	void __iomem		*ale_regs;
 	unsigned long		ale_ageout;	/* in secs */
 	unsigned long		ale_entries;
+	unsigned long		num_policers;
 	unsigned long		ale_ports;
 	/* NU Switch has specific handling as number of bits in ALE entries
 	 * are different than other versions of ALE. Also there are specific
@@ -33,6 +34,8 @@ struct regmap;
 enum ale_fields {
 	MINOR_VER,
 	MAJOR_VER,
+	ENTRIES,
+	POLICERS,
 	/* terminator */
 	ALE_FIELDS_MAX,
 };

-- 
2.34.1