openwrt/target/linux/generic/backport-6.1/778-v6.3-02-net-dsa-qca8k-convert-to-regmap-read-write-API.patch

From c766e077d927e1775902c18827205ea2ade3a35d Mon Sep 17 00:00:00 2001
From: Christian Marangi <ansuelsmth@gmail.com>
Date: Wed, 25 Jan 2023 21:35:17 +0100
Subject: [PATCH] net: dsa: qca8k: convert to regmap read/write API

Convert qca8k to regmap read/write bulk API. The mgmt eth can write up
to 32 bytes of data at times. Currently we use a custom function to do
it but regmap now supports declaration of read/write bulk even without a
bus.

Drop the custom function and rework the regmap function to this new
implementation.

Rework the qca8k_fdb_read/write function to use the new
regmap_bulk_read/write as the old qca8k_bulk_read/write are now dropped.

Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/dsa/qca/qca8k-8xxx.c   | 92 ++++++++++++++++++++++++------
 drivers/net/dsa/qca/qca8k-common.c | 47 ++-------------
 drivers/net/dsa/qca/qca8k.h        |  3 -
 3 files changed, 77 insertions(+), 65 deletions(-)

--- a/drivers/net/dsa/qca/qca8k-8xxx.c
+++ b/drivers/net/dsa/qca/qca8k-8xxx.c
@@ -425,16 +425,12 @@ qca8k_regmap_update_bits_eth(struct qca8
 }
 
 static int
-qca8k_regmap_read(void *ctx, uint32_t reg, uint32_t *val)
+qca8k_read_mii(struct qca8k_priv *priv, uint32_t reg, uint32_t *val)
 {
-	struct qca8k_priv *priv = (struct qca8k_priv *)ctx;
 	struct mii_bus *bus = priv->bus;
 	u16 r1, r2, page;
 	int ret;
 
-	if (!qca8k_read_eth(priv, reg, val, sizeof(*val)))
-		return 0;
-
 	qca8k_split_addr(reg, &r1, &r2, &page);
 
 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
@@ -451,16 +447,12 @@ exit:
 }
 
 static int
-qca8k_regmap_write(void *ctx, uint32_t reg, uint32_t val)
+qca8k_write_mii(struct qca8k_priv *priv, uint32_t reg, uint32_t val)
 {
-	struct qca8k_priv *priv = (struct qca8k_priv *)ctx;
 	struct mii_bus *bus = priv->bus;
 	u16 r1, r2, page;
 	int ret;
 
-	if (!qca8k_write_eth(priv, reg, &val, sizeof(val)))
-		return 0;
-
 	qca8k_split_addr(reg, &r1, &r2, &page);
 
 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
@@ -477,17 +469,14 @@ exit:
 }
 
 static int
-qca8k_regmap_update_bits(void *ctx, uint32_t reg, uint32_t mask, uint32_t write_val)
+qca8k_regmap_update_bits_mii(struct qca8k_priv *priv, uint32_t reg,
+			     uint32_t mask, uint32_t write_val)
 {
-	struct qca8k_priv *priv = (struct qca8k_priv *)ctx;
 	struct mii_bus *bus = priv->bus;
 	u16 r1, r2, page;
 	u32 val;
 	int ret;
 
-	if (!qca8k_regmap_update_bits_eth(priv, reg, mask, write_val))
-		return 0;
-
 	qca8k_split_addr(reg, &r1, &r2, &page);
 
 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
@@ -510,17 +499,84 @@ exit:
 	return ret;
 }
 
+static int
+qca8k_bulk_read(void *ctx, const void *reg_buf, size_t reg_len,
+		void *val_buf, size_t val_len)
+{
+	int i, count = val_len / sizeof(u32), ret;
+	u32 reg = *(u32 *)reg_buf & U16_MAX;
+	struct qca8k_priv *priv = ctx;
+
+	if (priv->mgmt_master &&
+	    !qca8k_read_eth(priv, reg, val_buf, val_len))
+		return 0;
+
+	/* loop count times and increment reg of 4 */
+	for (i = 0; i < count; i++, reg += sizeof(u32)) {
+		ret = qca8k_read_mii(priv, reg, val_buf + i);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int
+qca8k_bulk_gather_write(void *ctx, const void *reg_buf, size_t reg_len,
+			const void *val_buf, size_t val_len)
+{
+	int i, count = val_len / sizeof(u32), ret;
+	u32 reg = *(u32 *)reg_buf & U16_MAX;
+	struct qca8k_priv *priv = ctx;
+	u32 *val = (u32 *)val_buf;
+
+	if (priv->mgmt_master &&
+	    !qca8k_write_eth(priv, reg, val, val_len))
+		return 0;
+
+	/* loop count times, increment reg of 4 and increment val ptr to
+	 * the next value
+	 */
+	for (i = 0; i < count; i++, reg += sizeof(u32), val++) {
+		ret = qca8k_write_mii(priv, reg, *val);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int
+qca8k_bulk_write(void *ctx, const void *data, size_t bytes)
+{
+	return qca8k_bulk_gather_write(ctx, data, sizeof(u16), data + sizeof(u16),
+				       bytes - sizeof(u16));
+}
+
+static int
+qca8k_regmap_update_bits(void *ctx, uint32_t reg, uint32_t mask, uint32_t write_val)
+{
+	struct qca8k_priv *priv = ctx;
+
+	if (!qca8k_regmap_update_bits_eth(priv, reg, mask, write_val))
+		return 0;
+
+	return qca8k_regmap_update_bits_mii(priv, reg, mask, write_val);
+}
+
 static struct regmap_config qca8k_regmap_config = {
 	.reg_bits = 16,
 	.val_bits = 32,
 	.reg_stride = 4,
 	.max_register = 0x16ac, /* end MIB - Port6 range */
-	.reg_read = qca8k_regmap_read,
-	.reg_write = qca8k_regmap_write,
+	.read = qca8k_bulk_read,
+	.write = qca8k_bulk_write,
 	.reg_update_bits = qca8k_regmap_update_bits,
 	.rd_table = &qca8k_readable_table,
 	.disable_locking = true, /* Locking is handled by qca8k read/write */
 	.cache_type = REGCACHE_NONE, /* Explicitly disable CACHE */
+	.max_raw_read = 32, /* mgmt eth can read/write up to 8 registers at time */
+	.max_raw_write = 32,
 };
 
 static int
@@ -2102,8 +2158,6 @@ static SIMPLE_DEV_PM_OPS(qca8k_pm_ops,
 
 static const struct qca8k_info_ops qca8xxx_ops = {
 	.autocast_mib = qca8k_get_ethtool_stats_eth,
-	.read_eth = qca8k_read_eth,
-	.write_eth = qca8k_write_eth,
 };
 
 static const struct qca8k_match_data qca8327 = {
--- a/drivers/net/dsa/qca/qca8k-common.c
+++ b/drivers/net/dsa/qca/qca8k-common.c
@@ -101,45 +101,6 @@ const struct regmap_access_table qca8k_r
 	.n_yes_ranges = ARRAY_SIZE(qca8k_readable_ranges),
 };
 
-/* TODO: remove these extra ops when we can support regmap bulk read/write */
-static int qca8k_bulk_read(struct qca8k_priv *priv, u32 reg, u32 *val, int len)
-{
-	int i, count = len / sizeof(u32), ret;
-
-	if (priv->mgmt_master && priv->info->ops->read_eth &&
-	    !priv->info->ops->read_eth(priv, reg, val, len))
-		return 0;
-
-	for (i = 0; i < count; i++) {
-		ret = regmap_read(priv->regmap, reg + (i * 4), val + i);
-		if (ret < 0)
-			return ret;
-	}
-
-	return 0;
-}
-
-/* TODO: remove these extra ops when we can support regmap bulk read/write */
-static int qca8k_bulk_write(struct qca8k_priv *priv, u32 reg, u32 *val, int len)
-{
-	int i, count = len / sizeof(u32), ret;
-	u32 tmp;
-
-	if (priv->mgmt_master && priv->info->ops->write_eth &&
-	    !priv->info->ops->write_eth(priv, reg, val, len))
-		return 0;
-
-	for (i = 0; i < count; i++) {
-		tmp = val[i];
-
-		ret = regmap_write(priv->regmap, reg + (i * 4), tmp);
-		if (ret < 0)
-			return ret;
-	}
-
-	return 0;
-}
-
 static int qca8k_busy_wait(struct qca8k_priv *priv, u32 reg, u32 mask)
 {
 	u32 val;
@@ -154,8 +115,8 @@ static int qca8k_fdb_read(struct qca8k_p
 	int ret;
 
 	/* load the ARL table into an array */
-	ret = qca8k_bulk_read(priv, QCA8K_REG_ATU_DATA0, reg,
-			      QCA8K_ATU_TABLE_SIZE * sizeof(u32));
+	ret = regmap_bulk_read(priv->regmap, QCA8K_REG_ATU_DATA0, reg,
+			       QCA8K_ATU_TABLE_SIZE);
 	if (ret)
 		return ret;
 
@@ -196,8 +157,8 @@ static void qca8k_fdb_write(struct qca8k
 	reg[0] |= FIELD_PREP(QCA8K_ATU_ADDR5_MASK, mac[5]);
 
 	/* load the array into the ARL table */
-	qca8k_bulk_write(priv, QCA8K_REG_ATU_DATA0, reg,
-			 QCA8K_ATU_TABLE_SIZE * sizeof(u32));
+	regmap_bulk_write(priv->regmap, QCA8K_REG_ATU_DATA0, reg,
+			  QCA8K_ATU_TABLE_SIZE);
 }
 
 static int qca8k_fdb_access(struct qca8k_priv *priv, enum qca8k_fdb_cmd cmd,
--- a/drivers/net/dsa/qca/qca8k.h
+++ b/drivers/net/dsa/qca/qca8k.h
@@ -330,9 +330,6 @@ struct qca8k_priv;
 
 struct qca8k_info_ops {
 	int (*autocast_mib)(struct dsa_switch *ds, int port, u64 *data);
-	/* TODO: remove these extra ops when we can support regmap bulk read/write */
-	int (*read_eth)(struct qca8k_priv *priv, u32 reg, u32 *val, int len);
-	int (*write_eth)(struct qca8k_priv *priv, u32 reg, u32 *val, int len);
 };
 
 struct qca8k_match_data {