[PATCH net-next v8 8/9] net: txgbe: Implement phylink pcs

Jiawen Wu
2023-05-15T06:35:06Z

Register MDIO bus for PCS layer to use Synopsys designware XPCS, support
10GBASE-R interface to the controller.

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
---
drivers/net/ethernet/wangxun/Kconfig | 1 +
.../net/ethernet/wangxun/txgbe/txgbe_phy.c | 97 ++++++++++++++++++-
.../net/ethernet/wangxun/txgbe/txgbe_type.h | 6 ++
3 files changed, 102 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/wangxun/Kconfig b/drivers/net/ethernet/wangxun/Kconfig
index 73f4492928c0..f3fb273e6fd0 100644
--- a/drivers/net/ethernet/wangxun/Kconfig
+++ b/drivers/net/ethernet/wangxun/Kconfig
@@ -45,6 +45,7 @@ config TXGBE
select GPIOLIB
select REGMAP
select COMMON_CLK
+ select PCS_XPCS
select LIBWX
select SFP
help
diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c b/drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c
index aa8b4444e77a..36c6517c7266 100644
--- a/drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c
+++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c
@@ -8,6 +8,8 @@
#include <linux/regmap.h>
#include <linux/clkdev.h>
#include <linux/clk-provider.h>
+#include <linux/pcs/pcs-xpcs.h>
+#include <linux/mdio.h>
#include <linux/i2c.h>
#include <linux/pci.h>

@@ -77,6 +79,88 @@ static int txgbe_swnodes_register(struct txgbe *txgbe)
return software_node_register_node_group(nodes->group);
}

+static int txgbe_pcs_read(struct mii_bus *bus, int addr, int devnum, int regnum)
+{
+ struct wx *wx = bus->priv;
+ u32 offset, val;
+
+ if (addr)
+ return -EOPNOTSUPP;
+
+ offset = devnum << 16 | regnum;
+
+ /* Set the LAN port indicator to IDA_ADDR */
+ wr32(wx, TXGBE_XPCS_IDA_ADDR, offset);
+
+ /* Read the data from IDA_DATA register */
+ val = rd32(wx, TXGBE_XPCS_IDA_DATA);
+
+ return (u16)val;
+}
+
+static int txgbe_pcs_write(struct mii_bus *bus, int addr, int devnum, int regnum, u16 val)
+{
+ struct wx *wx = bus->priv;
+ u32 offset;
+
+ if (addr)
+ return -EOPNOTSUPP;
+
+ offset = devnum << 16 | regnum;
+
+ /* Set the LAN port indicator to IDA_ADDR */
+ wr32(wx, TXGBE_XPCS_IDA_ADDR, offset);
+
+ /* Write the data to IDA_DATA register */
+ wr32(wx, TXGBE_XPCS_IDA_DATA, val);
+
+ return 0;
+}
+
+static int txgbe_mdio_pcs_init(struct txgbe *txgbe)
+{
+ struct mdio_device *mdiodev;
+ struct wx *wx = txgbe->wx;
+ struct mii_bus *mii_bus;
+ struct dw_xpcs *xpcs;
+ struct pci_dev *pdev;
+ int ret = 0;
+
+ pdev = wx->pdev;
+
+ mii_bus = devm_mdiobus_alloc(&pdev->dev);
+ if (!mii_bus)
+ return -ENOMEM;
+
+ mii_bus->name = "txgbe_pcs_mdio_bus";
+ mii_bus->read_c45 = &txgbe_pcs_read;
+ mii_bus->write_c45 = &txgbe_pcs_write;
+ mii_bus->parent = &pdev->dev;
+ mii_bus->phy_mask = ~0;
+ mii_bus->priv = wx;
+ snprintf(mii_bus->id, MII_BUS_ID_SIZE, "txgbe_pcs-%x",
+ (pdev->bus->number << 8) | pdev->devfn);
+
+ ret = devm_mdiobus_register(&pdev->dev, mii_bus);
+ if (ret)
+ return ret;
+
+ mdiodev = mdio_device_create(mii_bus, 0);
+ if (IS_ERR(mdiodev))
+ return PTR_ERR(mdiodev);
+
+ xpcs = xpcs_create(mdiodev, PHY_INTERFACE_MODE_10GBASER);
+ if (IS_ERR(xpcs)) {
+ mdio_device_free(mdiodev);
+ return PTR_ERR(xpcs);
+ }
+
+ txgbe->mdiodev = mdiodev;
+ txgbe->xpcs = xpcs;
+
+ return 0;
+}
+
static int txgbe_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
struct wx *wx = gpiochip_get_data(chip);
@@ -423,16 +507,22 @@ int txgbe_init_phy(struct txgbe *txgbe)
return ret;
}

+ ret = txgbe_mdio_pcs_init(txgbe);
+ if (ret) {
+ wx_err(txgbe->wx, "failed to init mdio pcs: %d\n", ret);
+ goto err_unregister_swnode;
+ }
+
ret = txgbe_gpio_init(txgbe);
if (ret) {
wx_err(txgbe->wx, "failed to init gpio\n");
- goto err_unregister_swnode;
+ goto err_destroy_xpcs;
}

ret = txgbe_clock_register(txgbe);
if (ret) {
wx_err(txgbe->wx, "failed to register clock: %d\n", ret);
- goto err_unregister_swnode;
+ goto err_destroy_xpcs;
}

ret = txgbe_i2c_register(txgbe);
@@ -454,6 +544,8 @@ int txgbe_init_phy(struct txgbe *txgbe)
err_unregister_clk:
clkdev_drop(txgbe->clock);
clk_unregister(txgbe->clk);
+err_destroy_xpcs:
+ xpcs_destroy(txgbe->xpcs);
err_unregister_swnode:
software_node_unregister_node_group(txgbe->nodes.group);

@@ -466,5 +558,6 @@ void txgbe_remove_phy(struct txgbe *txgbe)
platform_device_unregister(txgbe->i2c_dev);
clkdev_drop(txgbe->clock);
clk_unregister(txgbe->clk);
+ xpcs_destroy(txgbe->xpcs);
software_node_unregister_node_group(txgbe->nodes.group);
}
diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_type.h b/drivers/net/ethernet/wangxun/txgbe/txgbe_type.h
index 6c903e4517c7..6c0393c19b83 100644
--- a/drivers/net/ethernet/wangxun/txgbe/txgbe_type.h
+++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_type.h
@@ -80,6 +80,10 @@
/* I2C registers */
#define TXGBE_I2C_BASE 0x14900

+/************************************** ETH PHY ******************************/
+#define TXGBE_XPCS_IDA_ADDR 0x13000
+#define TXGBE_XPCS_IDA_DATA 0x13004
+
/* Part Number String Length */
#define TXGBE_PBANUM_LENGTH 32

@@ -171,6 +175,8 @@ struct txgbe_nodes {
struct txgbe {
struct wx *wx;
struct txgbe_nodes nodes;
+ struct mdio_device *mdiodev;
+ struct dw_xpcs *xpcs;
struct platform_device *sfp_dev;
struct platform_device *i2c_dev;
struct clk_lookup *clock;
--
2.27.0