[PATCH net-next 4/4] net: dsa: lan9303: MDIO access phy registers directly

Egil Hjelmeland
2017-07-28T15:12:40Z

Indirect access (PMI) to phy register only work in I2C mode. In
MDIO mode phy registers must be accessed directly. Introduced
struct lan9303_phy_ops to handle the two modes.

Signed-off-by: Egil Hjelmeland <privat@egil-hjelmeland.no>
---
drivers/net/dsa/lan9303-core.c | 20 +++++++++++++-------
drivers/net/dsa/lan9303.h | 11 +++++++++++
drivers/net/dsa/lan9303_i2c.c | 2 ++
drivers/net/dsa/lan9303_mdio.c | 21 +++++++++++++++++++++
4 files changed, 47 insertions(+), 7 deletions(-)

diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c
index 9427c3b0ced2..9910fc9d5dd6 100644
--- a/drivers/net/dsa/lan9303-core.c
+++ b/drivers/net/dsa/lan9303-core.c
@@ -334,6 +334,12 @@ static int lan9303_indirect_phy_write(struct lan9303 *chip, int addr,
return ret;
}

+const struct lan9303_phy_ops lan9303_indirect_phy_ops = {
+ .phy_read = lan9303_indirect_phy_read,
+ .phy_write = lan9303_indirect_phy_write,
+};
+EXPORT_SYMBOL(lan9303_indirect_phy_ops);
+
static int lan9303_switch_wait_for_completion(struct lan9303 *chip)
{
int ret, i;
@@ -435,7 +441,7 @@ static int lan9303_detect_phy_setup(struct lan9303 *chip)
* 0x0000, which means 'phy_addr_sel_strap' is 1 and the IDs are 1-2-3.
* 0xffff is returned on MDIO read with no response.
*/
- reg = lan9303_indirect_phy_read(chip, 3, MII_LAN911X_SPECIAL_MODES);
+ reg = chip->ops->phy_read(chip, 3, MII_LAN911X_SPECIAL_MODES);
if (reg < 0) {
dev_err(chip->dev, "Failed to detect phy config: %d\n", reg);
return reg;
@@ -726,7 +732,7 @@ static int lan9303_phy_read(struct dsa_switch *ds, int phy, int regnum)
if (phy > phy_base + 2)
return -ENODEV;

- return lan9303_indirect_phy_read(chip, phy, regnum);
+ return chip->ops->phy_read(chip, phy, regnum);
}

static int lan9303_phy_write(struct dsa_switch *ds, int phy, int regnum,
@@ -740,7 +746,7 @@ static int lan9303_phy_write(struct dsa_switch *ds, int phy, int regnum,
if (phy > phy_base + 2)
return -ENODEV;

- return lan9303_indirect_phy_write(chip, phy, regnum, val);
+ return chip->ops->phy_write(chip, phy, regnum, val);
}

static int lan9303_port_enable(struct dsa_switch *ds, int port,
@@ -773,13 +779,13 @@ static void lan9303_port_disable(struct dsa_switch *ds, int port,
switch (port) {
case 1:
lan9303_disable_packet_processing(chip, LAN9303_PORT_1_OFFSET);
- lan9303_indirect_phy_write(chip, chip->phy_addr_sel_strap + 1,
- MII_BMCR, BMCR_PDOWN);
+ lan9303_phy_write(ds, chip->phy_addr_sel_strap + 1,
+ MII_BMCR, BMCR_PDOWN);
break;
case 2:
lan9303_disable_packet_processing(chip, LAN9303_PORT_2_OFFSET);
- lan9303_indirect_phy_write(chip, chip->phy_addr_sel_strap + 2,
- MII_BMCR, BMCR_PDOWN);
+ lan9303_phy_write(ds, chip->phy_addr_sel_strap + 2,
+ MII_BMCR, BMCR_PDOWN);
break;
default:
dev_dbg(chip->dev,
diff --git a/drivers/net/dsa/lan9303.h b/drivers/net/dsa/lan9303.h
index d1512dad2d90..4d8be555ff4d 100644
--- a/drivers/net/dsa/lan9303.h
+++ b/drivers/net/dsa/lan9303.h
@@ -2,6 +2,15 @@
#include <linux/device.h>
#include <net/dsa.h>

+struct lan9303;
+
+struct lan9303_phy_ops {
+ /* PHY 1 and 2 access*/
+ int (*phy_read)(struct lan9303 *chip, int port, int regnum);
+ int (*phy_write)(struct lan9303 *chip, int port,
+ int regnum, u16 val);
+};
+
struct lan9303 {
struct device *dev;
struct regmap *regmap;
@@ -11,9 +20,11 @@ struct lan9303 {
bool phy_addr_sel_strap;
struct dsa_switch *ds;
struct mutex indirect_mutex; /* protect indexed register access */
+ const struct lan9303_phy_ops *ops;
};

extern const struct regmap_access_table lan9303_register_set;
+extern const struct lan9303_phy_ops lan9303_indirect_phy_ops;

int lan9303_probe(struct lan9303 *chip, struct device_node *np);
int lan9303_remove(struct lan9303 *chip);
diff --git a/drivers/net/dsa/lan9303_i2c.c b/drivers/net/dsa/lan9303_i2c.c
index ab3ce0da5071..24ec20f7f444 100644
--- a/drivers/net/dsa/lan9303_i2c.c
+++ b/drivers/net/dsa/lan9303_i2c.c
@@ -63,6 +63,8 @@ static int lan9303_i2c_probe(struct i2c_client *client,
i2c_set_clientdata(client, sw_dev);
sw_dev->chip.dev = &client->dev;

+ sw_dev->chip.ops = &lan9303_indirect_phy_ops;
+
ret = lan9303_probe(&sw_dev->chip, client->dev.of_node);
if (ret != 0)
return ret;
diff --git a/drivers/net/dsa/lan9303_mdio.c b/drivers/net/dsa/lan9303_mdio.c
index 2db7970fc88c..fc16668a487f 100644
--- a/drivers/net/dsa/lan9303_mdio.c
+++ b/drivers/net/dsa/lan9303_mdio.c
@@ -67,6 +67,25 @@ static int lan9303_mdio_read(void *ctx, uint32_t reg, uint32_t *val)
return 0;
}

+int lan9303_mdio_phy_write(struct lan9303 *chip, int phy, int reg, u16 val)
+{
+ struct lan9303_mdio *sw_dev = dev_get_drvdata(chip->dev);
+
+ return mdiobus_write_nested(sw_dev->device->bus, phy, reg, val);
+}
+
+int lan9303_mdio_phy_read(struct lan9303 *chip, int phy, int reg)
+{
+ struct lan9303_mdio *sw_dev = dev_get_drvdata(chip->dev);
+
+ return mdiobus_read_nested(sw_dev->device->bus, phy, reg);
+}
+
+static const struct lan9303_phy_ops lan9303_mdio_phy_ops = {
+ .phy_read = lan9303_mdio_phy_read,
+ .phy_write = lan9303_mdio_phy_write,
+};
+
static const struct regmap_config lan9303_mdio_regmap_config = {
.reg_bits = 8,
.val_bits = 32,
@@ -108,6 +127,8 @@ static int lan9303_mdio_probe(struct mdio_device *mdiodev)
dev_set_drvdata(&mdiodev->dev, sw_dev);
sw_dev->chip.dev = &mdiodev->dev;

+ sw_dev->chip.ops = &lan9303_mdio_phy_ops;
+
ret = lan9303_probe(&sw_dev->chip, mdiodev->dev.of_node);
if (ret != 0)
return ret;
--
2.11.0