diff mbox series

[RFC,net-next,v2,06/12] net: mdio: mdio-bitbang: Separate C22 and C45 transactions

Message ID 20221227-v6-2-rc1-c45-seperation-v2-6-ddb37710e5a7@walle.cc (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series net: mdio: Start separating C22 and C45 | expand

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netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit fail Errors and warnings before: 40 this patch: 48
netdev/cc_maintainers success CCed 14 of 14 maintainers
netdev/build_clang fail Errors and warnings before: 261 this patch: 270
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn fail Errors and warnings before: 40 this patch: 48
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 193 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Michael Walle Dec. 27, 2022, 11:07 p.m. UTC 
From: Andrew Lunn <andrew@lunn.ch>

The bitbbanging bus driver can perform both C22 and C45 transfers.
Create separate functions for each and register the C45 versions using
the new driver API calls.

The SH Ethernet driver places wrappers around these functions. In
order to not break boards which might be using C45, add similar
wrappers for C45 operations.

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Michael Walle <michael@walle.cc>
---
 drivers/net/ethernet/renesas/sh_eth.c | 37 ++++++++++++++---
 drivers/net/mdio/mdio-bitbang.c       | 77 +++++++++++++++++++++++------------
 include/linux/mdio-bitbang.h          |  6 ++-
 3 files changed, 87 insertions(+), 33 deletions(-)

Comments

Vladimir Oltean Jan. 3, 2023, 1:15 p.m. UTC | #1 
On Wed, Dec 28, 2022 at 12:07:22AM +0100, Michael Walle wrote:
> From: Andrew Lunn <andrew@lunn.ch>
> 
> The bitbbanging bus driver can perform both C22 and C45 transfers.
> Create separate functions for each and register the C45 versions using
> the new driver API calls.
> 
> The SH Ethernet driver places wrappers around these functions. In
> order to not break boards which might be using C45, add similar
> wrappers for C45 operations.
> 
> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
> Signed-off-by: Andrew Lunn <andrew@lunn.ch>
> Signed-off-by: Michael Walle <michael@walle.cc>
> ---

Incomplete conversion, this breaks the build. Need to update all users
of the bitbang driver (also davinci_mdio). Something like the diff below
fixes that, but it leaves the davinci_mdio driver in a partially
converted state (if data->manual_mode is true, new API is used,
otherwise old API is used). So another patch to convert the other case
will likely be needed.

diff --git a/drivers/net/ethernet/ti/davinci_mdio.c b/drivers/net/ethernet/ti/davinci_mdio.c
index 946b9753ccfb..23169e36a3d4 100644
--- a/drivers/net/ethernet/ti/davinci_mdio.c
+++ b/drivers/net/ethernet/ti/davinci_mdio.c
@@ -225,7 +225,7 @@ static int davinci_get_mdio_data(struct mdiobb_ctrl *ctrl)
 	return test_bit(MDIO_PIN, &reg);
 }
 
-static int davinci_mdiobb_read(struct mii_bus *bus, int phy, int reg)
+static int davinci_mdiobb_read_c22(struct mii_bus *bus, int phy, int reg)
 {
 	int ret;
 
@@ -233,7 +233,7 @@ static int davinci_mdiobb_read(struct mii_bus *bus, int phy, int reg)
 	if (ret < 0)
 		return ret;
 
-	ret = mdiobb_read(bus, phy, reg);
+	ret = mdiobb_read_c22(bus, phy, reg);
 
 	pm_runtime_mark_last_busy(bus->parent);
 	pm_runtime_put_autosuspend(bus->parent);
@@ -241,8 +241,8 @@ static int davinci_mdiobb_read(struct mii_bus *bus, int phy, int reg)
 	return ret;
 }
 
-static int davinci_mdiobb_write(struct mii_bus *bus, int phy, int reg,
-				u16 val)
+static int davinci_mdiobb_write_c22(struct mii_bus *bus, int phy, int reg,
+				    u16 val)
 {
 	int ret;
 
@@ -250,7 +250,41 @@ static int davinci_mdiobb_write(struct mii_bus *bus, int phy, int reg,
 	if (ret < 0)
 		return ret;
 
-	ret = mdiobb_write(bus, phy, reg, val);
+	ret = mdiobb_write_c22(bus, phy, reg, val);
+
+	pm_runtime_mark_last_busy(bus->parent);
+	pm_runtime_put_autosuspend(bus->parent);
+
+	return ret;
+}
+
+static int davinci_mdiobb_read_c45(struct mii_bus *bus, int phy, int devad,
+				   int reg)
+{
+	int ret;
+
+	ret = pm_runtime_resume_and_get(bus->parent);
+	if (ret < 0)
+		return ret;
+
+	ret = mdiobb_read_c45(bus, phy, devad, reg);
+
+	pm_runtime_mark_last_busy(bus->parent);
+	pm_runtime_put_autosuspend(bus->parent);
+
+	return ret;
+}
+
+static int davinci_mdiobb_write_c45(struct mii_bus *bus, int phy, int devad,
+				    int reg, u16 val)
+{
+	int ret;
+
+	ret = pm_runtime_resume_and_get(bus->parent);
+	if (ret < 0)
+		return ret;
+
+	ret = mdiobb_write_c45(bus, phy, devad, reg, val);
 
 	pm_runtime_mark_last_busy(bus->parent);
 	pm_runtime_put_autosuspend(bus->parent);
@@ -573,8 +607,10 @@ static int davinci_mdio_probe(struct platform_device *pdev)
 	data->bus->name		= dev_name(dev);
 
 	if (data->manual_mode) {
-		data->bus->read		= davinci_mdiobb_read;
-		data->bus->write	= davinci_mdiobb_write;
+		data->bus->read		= davinci_mdiobb_read_c22;
+		data->bus->write	= davinci_mdiobb_write_c22;
+		data->bus->read_c45	= davinci_mdiobb_read_c45;
+		data->bus->write_c45	= davinci_mdiobb_write_c45;
 		data->bus->reset	= davinci_mdiobb_reset;
 
 		dev_info(dev, "Configuring MDIO in manual mode\n");
Michael Walle Jan. 3, 2023, 1:27 p.m. UTC | #2 
Am 2023-01-03 14:15, schrieb Vladimir Oltean:
> On Wed, Dec 28, 2022 at 12:07:22AM +0100, Michael Walle wrote:
>> From: Andrew Lunn <andrew@lunn.ch>
>> 
>> The bitbbanging bus driver can perform both C22 and C45 transfers.
>> Create separate functions for each and register the C45 versions using
>> the new driver API calls.
>> 
>> The SH Ethernet driver places wrappers around these functions. In
>> order to not break boards which might be using C45, add similar
>> wrappers for C45 operations.
>> 
>> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
>> Signed-off-by: Andrew Lunn <andrew@lunn.ch>
>> Signed-off-by: Michael Walle <michael@walle.cc>
>> ---
> 
> Incomplete conversion, this breaks the build. Need to update all users
> of the bitbang driver (also davinci_mdio). Something like the diff 
> below
> fixes that, but it leaves the davinci_mdio driver in a partially
> converted state (if data->manual_mode is true, new API is used,
> otherwise old API is used). So another patch to convert the other case
> will likely be needed.

The intel build bot already notified me about this. Unfortunately, only
privately as I just noticed.

And yes, these are just the first 12 patches of a larger series.

-michael
diff mbox series

Patch

diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index 71a499113308..ed17163d7811 100644
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -3044,23 +3044,46 @@  static int sh_mdio_release(struct sh_eth_private *mdp)
 	return 0;
 }
 
-static int sh_mdiobb_read(struct mii_bus *bus, int phy, int reg)
+static int sh_mdiobb_read_c22(struct mii_bus *bus, int phy, int reg)
 {
 	int res;
 
 	pm_runtime_get_sync(bus->parent);
-	res = mdiobb_read(bus, phy, reg);
+	res = mdiobb_read_c22(bus, phy, reg);
 	pm_runtime_put(bus->parent);
 
 	return res;
 }
 
-static int sh_mdiobb_write(struct mii_bus *bus, int phy, int reg, u16 val)
+static int sh_mdiobb_write_c22(struct mii_bus *bus, int phy, int reg, u16 val)
 {
 	int res;
 
 	pm_runtime_get_sync(bus->parent);
-	res = mdiobb_write(bus, phy, reg, val);
+	res = mdiobb_write_c22(bus, phy, reg, val);
+	pm_runtime_put(bus->parent);
+
+	return res;
+}
+
+static int sh_mdiobb_read_c45(struct mii_bus *bus, int phy, int devad, int reg)
+{
+	int res;
+
+	pm_runtime_get_sync(bus->parent);
+	res = mdiobb_read_c45(bus, phy, devad, reg);
+	pm_runtime_put(bus->parent);
+
+	return res;
+}
+
+static int sh_mdiobb_write_c45(struct mii_bus *bus, int phy, int devad,
+			       int reg, u16 val)
+{
+	int res;
+
+	pm_runtime_get_sync(bus->parent);
+	res = mdiobb_write_c45(bus, phy, devad, reg, val);
 	pm_runtime_put(bus->parent);
 
 	return res;
@@ -3091,8 +3114,10 @@  static int sh_mdio_init(struct sh_eth_private *mdp,
 		return -ENOMEM;
 
 	/* Wrap accessors with Runtime PM-aware ops */
-	mdp->mii_bus->read = sh_mdiobb_read;
-	mdp->mii_bus->write = sh_mdiobb_write;
+	mdp->mii_bus->read = sh_mdiobb_read_c22;
+	mdp->mii_bus->write = sh_mdiobb_write_c22;
+	mdp->mii_bus->read_c45 = sh_mdiobb_read_c45;
+	mdp->mii_bus->write_c45 = sh_mdiobb_write_c45;
 
 	/* Hook up MII support for ethtool */
 	mdp->mii_bus->name = "sh_mii";
diff --git a/drivers/net/mdio/mdio-bitbang.c b/drivers/net/mdio/mdio-bitbang.c
index 07609114a26b..b83932562be2 100644
--- a/drivers/net/mdio/mdio-bitbang.c
+++ b/drivers/net/mdio/mdio-bitbang.c
@@ -127,14 +127,12 @@  static void mdiobb_cmd(struct mdiobb_ctrl *ctrl, int op, u8 phy, u8 reg)
 
 /* In clause 45 mode all commands are prefixed by MDIO_ADDR to specify the
    lower 16 bits of the 21 bit address. This transfer is done identically to a
-   MDIO_WRITE except for a different code. To enable clause 45 mode or
-   MII_ADDR_C45 into the address. Theoretically clause 45 and normal devices
-   can exist on the same bus. Normal devices should ignore the MDIO_ADDR
+   MDIO_WRITE except for a different code. Theoretically clause 45 and normal
+   devices can exist on the same bus. Normal devices should ignore the MDIO_ADDR
    phase. */
-static int mdiobb_cmd_addr(struct mdiobb_ctrl *ctrl, int phy, u32 addr)
+static void mdiobb_cmd_addr(struct mdiobb_ctrl *ctrl, int phy, int dev_addr,
+			    int reg)
 {
-	unsigned int dev_addr = (addr >> 16) & 0x1F;
-	unsigned int reg = addr & 0xFFFF;
 	mdiobb_cmd(ctrl, MDIO_C45_ADDR, phy, dev_addr);
 
 	/* send the turnaround (10) */
@@ -145,21 +143,13 @@  static int mdiobb_cmd_addr(struct mdiobb_ctrl *ctrl, int phy, u32 addr)
 
 	ctrl->ops->set_mdio_dir(ctrl, 0);
 	mdiobb_get_bit(ctrl);
-
-	return dev_addr;
 }
 
-int mdiobb_read(struct mii_bus *bus, int phy, int reg)
+static int mdiobb_read_common(struct mii_bus *bus, int phy)
 {
 	struct mdiobb_ctrl *ctrl = bus->priv;
 	int ret, i;
 
-	if (reg & MII_ADDR_C45) {
-		reg = mdiobb_cmd_addr(ctrl, phy, reg);
-		mdiobb_cmd(ctrl, MDIO_C45_READ, phy, reg);
-	} else
-		mdiobb_cmd(ctrl, ctrl->op_c22_read, phy, reg);
-
 	ctrl->ops->set_mdio_dir(ctrl, 0);
 
 	/* check the turnaround bit: the PHY should be driving it to zero, if this
@@ -180,17 +170,31 @@  int mdiobb_read(struct mii_bus *bus, int phy, int reg)
 	mdiobb_get_bit(ctrl);
 	return ret;
 }
-EXPORT_SYMBOL(mdiobb_read);
 
-int mdiobb_write(struct mii_bus *bus, int phy, int reg, u16 val)
+int mdiobb_read_c22(struct mii_bus *bus, int phy, int reg)
 {
 	struct mdiobb_ctrl *ctrl = bus->priv;
 
-	if (reg & MII_ADDR_C45) {
-		reg = mdiobb_cmd_addr(ctrl, phy, reg);
-		mdiobb_cmd(ctrl, MDIO_C45_WRITE, phy, reg);
-	} else
-		mdiobb_cmd(ctrl, ctrl->op_c22_write, phy, reg);
+	mdiobb_cmd(ctrl, ctrl->op_c22_read, phy, reg);
+
+	return mdiobb_read_common(bus, phy);
+}
+EXPORT_SYMBOL(mdiobb_read_c22);
+
+int mdiobb_read_c45(struct mii_bus *bus, int phy, int devad, int reg)
+{
+	struct mdiobb_ctrl *ctrl = bus->priv;
+
+	mdiobb_cmd_addr(ctrl, phy, devad, reg);
+	mdiobb_cmd(ctrl, MDIO_C45_READ, phy, reg);
+
+	return mdiobb_read_common(bus, phy);
+}
+EXPORT_SYMBOL(mdiobb_read_c45);
+
+static int mdiobb_write_common(struct mii_bus *bus, u16 val)
+{
+	struct mdiobb_ctrl *ctrl = bus->priv;
 
 	/* send the turnaround (10) */
 	mdiobb_send_bit(ctrl, 1);
@@ -202,7 +206,27 @@  int mdiobb_write(struct mii_bus *bus, int phy, int reg, u16 val)
 	mdiobb_get_bit(ctrl);
 	return 0;
 }
-EXPORT_SYMBOL(mdiobb_write);
+
+int mdiobb_write_c22(struct mii_bus *bus, int phy, int reg, u16 val)
+{
+	struct mdiobb_ctrl *ctrl = bus->priv;
+
+	mdiobb_cmd(ctrl, ctrl->op_c22_write, phy, reg);
+
+	return mdiobb_write_common(bus, val);
+}
+EXPORT_SYMBOL(mdiobb_write_c22);
+
+int mdiobb_write_c45(struct mii_bus *bus, int phy, int devad, int reg, u16 val)
+{
+	struct mdiobb_ctrl *ctrl = bus->priv;
+
+	mdiobb_cmd_addr(ctrl, phy, devad, reg);
+	mdiobb_cmd(ctrl, MDIO_C45_WRITE, phy, reg);
+
+	return mdiobb_write_common(bus, val);
+}
+EXPORT_SYMBOL(mdiobb_write_c45);
 
 struct mii_bus *alloc_mdio_bitbang(struct mdiobb_ctrl *ctrl)
 {
@@ -214,8 +238,11 @@  struct mii_bus *alloc_mdio_bitbang(struct mdiobb_ctrl *ctrl)
 
 	__module_get(ctrl->ops->owner);
 
-	bus->read = mdiobb_read;
-	bus->write = mdiobb_write;
+	bus->read = mdiobb_read_c22;
+	bus->write = mdiobb_write_c22;
+	bus->read_c45 = mdiobb_read_c45;
+	bus->write_c45 = mdiobb_write_c45;
+
 	bus->priv = ctrl;
 	if (!ctrl->override_op_c22) {
 		ctrl->op_c22_read = MDIO_READ;
diff --git a/include/linux/mdio-bitbang.h b/include/linux/mdio-bitbang.h
index 373630fe5c28..cffabdbce075 100644
--- a/include/linux/mdio-bitbang.h
+++ b/include/linux/mdio-bitbang.h
@@ -38,8 +38,10 @@  struct mdiobb_ctrl {
 	u8 op_c22_write;
 };
 
-int mdiobb_read(struct mii_bus *bus, int phy, int reg);
-int mdiobb_write(struct mii_bus *bus, int phy, int reg, u16 val);
+int mdiobb_read_c22(struct mii_bus *bus, int phy, int reg);
+int mdiobb_write_c22(struct mii_bus *bus, int phy, int reg, u16 val);
+int mdiobb_read_c45(struct mii_bus *bus, int devad, int phy, int reg);
+int mdiobb_write_c45(struct mii_bus *bus, int devad, int phy, int reg, u16 val);
 
 /* The returned bus is not yet registered with the phy layer. */
 struct mii_bus *alloc_mdio_bitbang(struct mdiobb_ctrl *ctrl);