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Message-ID: <97c2b3d65a0cd550922f809f6e6f51645ccc4ef9.1756855069.git.daniel@makrotopia.org>
Date: Wed, 3 Sep 2025 00:35:52 +0100
From: Daniel Golle <daniel@...rotopia.org>
To: Hauke Mehrtens <hauke@...ke-m.de>, Andrew Lunn <andrew@...n.ch>,
Vladimir Oltean <olteanv@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: Andreas Schirm <andreas.schirm@...mens.com>,
Lukas Stockmann <lukas.stockmann@...mens.com>,
Alexander Sverdlin <alexander.sverdlin@...mens.com>,
Peter Christen <peter.christen@...mens.com>,
Avinash Jayaraman <ajayaraman@...linear.com>,
Bing tao Xu <bxu@...linear.com>, Liang Xu <lxu@...linear.com>,
Juraj Povazanec <jpovazanec@...linear.com>,
"Fanni (Fang-Yi) Chan" <fchan@...linear.com>,
"Benny (Ying-Tsan) Weng" <yweng@...linear.com>,
"Livia M. Rosu" <lrosu@...linear.com>,
John Crispin <john@...ozen.org>
Subject: [RFC PATCH net-next 1/6] net: dsa: lantiq_gswip: convert accessors
to use regmap
Use regmap for register access in preparation for supporting the MaxLinear
GSW1xx family of switches connected via MDIO or SPI.
Rewrite the existing accessor read-poll-timeout functions to use calls to
the regmap API for now.
Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
drivers/net/dsa/lantiq/Kconfig | 1 +
drivers/net/dsa/lantiq/lantiq_gswip.c | 143 ++++++++++++++++++--------
drivers/net/dsa/lantiq/lantiq_gswip.h | 6 +-
3 files changed, 106 insertions(+), 44 deletions(-)
diff --git a/drivers/net/dsa/lantiq/Kconfig b/drivers/net/dsa/lantiq/Kconfig
index 1cb053c823f7..3cfa16840cf5 100644
--- a/drivers/net/dsa/lantiq/Kconfig
+++ b/drivers/net/dsa/lantiq/Kconfig
@@ -2,6 +2,7 @@ config NET_DSA_LANTIQ_GSWIP
tristate "Lantiq / Intel GSWIP"
depends on HAS_IOMEM
select NET_DSA_TAG_GSWIP
+ select REGMAP
help
This enables support for the Lantiq / Intel GSWIP 2.1 found in
the xrx200 / VR9 SoC.
diff --git a/drivers/net/dsa/lantiq/lantiq_gswip.c b/drivers/net/dsa/lantiq/lantiq_gswip.c
index 1d9b9689ef9f..00de075b027a 100644
--- a/drivers/net/dsa/lantiq/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq/lantiq_gswip.c
@@ -113,22 +113,40 @@ static const struct gswip_rmon_cnt_desc gswip_rmon_cnt[] = {
static u32 gswip_switch_r(struct gswip_priv *priv, u32 offset)
{
- return __raw_readl(priv->gswip + (offset * 4));
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(priv->gswip, offset, &val);
+ if (ret) {
+ WARN_ON_ONCE(1);
+ dev_err(priv->dev, "failed to read switch register\n");
+ return 0;
+ }
+
+ return val;
}
static void gswip_switch_w(struct gswip_priv *priv, u32 val, u32 offset)
{
- __raw_writel(val, priv->gswip + (offset * 4));
+ int ret;
+
+ ret = regmap_write(priv->gswip, offset, val);
+ if (ret) {
+ WARN_ON_ONCE(1);
+ dev_err(priv->dev, "failed to write switch register\n");
+ }
}
static void gswip_switch_mask(struct gswip_priv *priv, u32 clear, u32 set,
u32 offset)
{
- u32 val = gswip_switch_r(priv, offset);
+ int ret;
- val &= ~(clear);
- val |= set;
- gswip_switch_w(priv, val, offset);
+ ret = regmap_write_bits(priv->gswip, offset, clear | set, set);
+ if (ret) {
+ WARN_ON_ONCE(1);
+ dev_err(priv->dev, "failed to update switch register\n");
+ }
}
static u32 gswip_switch_r_timeout(struct gswip_priv *priv, u32 offset,
@@ -136,48 +154,58 @@ static u32 gswip_switch_r_timeout(struct gswip_priv *priv, u32 offset,
{
u32 val;
- return readx_poll_timeout(__raw_readl, priv->gswip + (offset * 4), val,
- (val & cleared) == 0, 20, 50000);
+ return regmap_read_poll_timeout(priv->gswip, offset, val,
+ !(val & cleared), 20, 50000);
}
static u32 gswip_mdio_r(struct gswip_priv *priv, u32 offset)
{
- return __raw_readl(priv->mdio + (offset * 4));
+ u32 val;
+ int ret;
+
+ ret = regmap_read(priv->mdio, offset, &val);
+ if (ret) {
+ WARN_ON_ONCE(1);
+ dev_err(priv->dev, "failed to read mdio register\n");
+ return 0;
+ }
+
+ return val;
}
static void gswip_mdio_w(struct gswip_priv *priv, u32 val, u32 offset)
{
- __raw_writel(val, priv->mdio + (offset * 4));
+ int ret;
+
+ ret = regmap_write(priv->mdio, offset, val);
+ if (ret) {
+ WARN_ON_ONCE(1);
+ dev_err(priv->dev, "failed to write mdio register\n");
+ }
}
static void gswip_mdio_mask(struct gswip_priv *priv, u32 clear, u32 set,
u32 offset)
{
- u32 val = gswip_mdio_r(priv, offset);
-
- val &= ~(clear);
- val |= set;
- gswip_mdio_w(priv, val, offset);
-}
-
-static u32 gswip_mii_r(struct gswip_priv *priv, u32 offset)
-{
- return __raw_readl(priv->mii + (offset * 4));
-}
+ int ret;
-static void gswip_mii_w(struct gswip_priv *priv, u32 val, u32 offset)
-{
- __raw_writel(val, priv->mii + (offset * 4));
+ ret = regmap_write_bits(priv->mdio, offset, clear | set, set);
+ if (ret) {
+ WARN_ON_ONCE(1);
+ dev_err(priv->dev, "failed to update mdio register\n");
+ }
}
static void gswip_mii_mask(struct gswip_priv *priv, u32 clear, u32 set,
u32 offset)
{
- u32 val = gswip_mii_r(priv, offset);
+ int ret;
- val &= ~(clear);
- val |= set;
- gswip_mii_w(priv, val, offset);
+ ret = regmap_write_bits(priv->mii, offset, clear | set, set);
+ if (ret) {
+ WARN_ON_ONCE(1);
+ dev_err(priv->dev, "failed to update mdio register\n");
+ }
}
static void gswip_mii_mask_cfg(struct gswip_priv *priv, u32 clear, u32 set,
@@ -220,17 +248,10 @@ static void gswip_mii_mask_pcdu(struct gswip_priv *priv, u32 clear, u32 set,
static int gswip_mdio_poll(struct gswip_priv *priv)
{
- int cnt = 100;
-
- while (likely(cnt--)) {
- u32 ctrl = gswip_mdio_r(priv, GSWIP_MDIO_CTRL);
-
- if ((ctrl & GSWIP_MDIO_CTRL_BUSY) == 0)
- return 0;
- usleep_range(20, 40);
- }
+ u32 ctrl;
- return -ETIMEDOUT;
+ return regmap_read_poll_timeout(priv->mdio, GSWIP_MDIO_CTRL, ctrl,
+ !(ctrl & GSWIP_MDIO_CTRL_BUSY), 40, 4000);
}
static int gswip_mdio_wr(struct mii_bus *bus, int addr, int reg, u16 val)
@@ -1900,9 +1921,37 @@ static int gswip_validate_cpu_port(struct dsa_switch *ds)
return 0;
}
+static const struct regmap_config sw_regmap_config = {
+ .name = "switch",
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_shift = -2,
+ .val_format_endian = REGMAP_ENDIAN_NATIVE,
+ .max_register = GSWIP_SDMA_PCTRLp(6),
+};
+
+static const struct regmap_config mdio_regmap_config = {
+ .name = "mdio",
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_shift = -2,
+ .val_format_endian = REGMAP_ENDIAN_NATIVE,
+ .max_register = GSWIP_MDIO_PHYp(0),
+};
+
+static const struct regmap_config mii_regmap_config = {
+ .name = "mii",
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_shift = -2,
+ .val_format_endian = REGMAP_ENDIAN_NATIVE,
+ .max_register = GSWIP_MII_CFGp(6),
+};
+
static int gswip_probe(struct platform_device *pdev)
{
struct device_node *np, *gphy_fw_np;
+ __iomem void *gswip, *mdio, *mii;
struct device *dev = &pdev->dev;
struct gswip_priv *priv;
int err;
@@ -1913,15 +1962,27 @@ static int gswip_probe(struct platform_device *pdev)
if (!priv)
return -ENOMEM;
- priv->gswip = devm_platform_ioremap_resource(pdev, 0);
+ gswip = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(gswip))
+ return PTR_ERR(gswip);
+
+ mdio = devm_platform_ioremap_resource(pdev, 1);
+ if (IS_ERR(mdio))
+ return PTR_ERR(mdio);
+
+ mii = devm_platform_ioremap_resource(pdev, 2);
+ if (IS_ERR(mii))
+ return PTR_ERR(mii);
+
+ priv->gswip = devm_regmap_init_mmio(dev, gswip, &sw_regmap_config);
if (IS_ERR(priv->gswip))
return PTR_ERR(priv->gswip);
- priv->mdio = devm_platform_ioremap_resource(pdev, 1);
+ priv->mdio = devm_regmap_init_mmio(dev, mdio, &mdio_regmap_config);
if (IS_ERR(priv->mdio))
return PTR_ERR(priv->mdio);
- priv->mii = devm_platform_ioremap_resource(pdev, 2);
+ priv->mii = devm_regmap_init_mmio(dev, mii, &mii_regmap_config);
if (IS_ERR(priv->mii))
return PTR_ERR(priv->mii);
diff --git a/drivers/net/dsa/lantiq/lantiq_gswip.h b/drivers/net/dsa/lantiq/lantiq_gswip.h
index 2df9c8e8cfd0..efc2e9041815 100644
--- a/drivers/net/dsa/lantiq/lantiq_gswip.h
+++ b/drivers/net/dsa/lantiq/lantiq_gswip.h
@@ -257,9 +257,9 @@ struct gswip_vlan {
};
struct gswip_priv {
- __iomem void *gswip;
- __iomem void *mdio;
- __iomem void *mii;
+ struct regmap *gswip;
+ struct regmap *mdio;
+ struct regmap *mii;
const struct gswip_hw_info *hw_info;
const struct xway_gphy_match_data *gphy_fw_name_cfg;
struct dsa_switch *ds;
--
2.51.0
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