mirror of https://gitee.com/openkylin/linux.git
net: phy: Add support for microchip SMI0 MDIO bus
SMI0 is a mangled version of MDIO. The main low level difference is the MDIO C22 OP code is always 0, not 0x2 or 0x1 for Read/Write. The read/write information is instead encoded in the PHY address. Extend the bit-bang code to allow the op code to be overridden, but default to normal C22 values. Add an extra compatible to the mdio-gpio driver, and when this compatible is present, set the op codes to 0. A higher level driver, sitting on top of the basic MDIO bus driver can then implement the rest of the microchip SMI0 odderties. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -158,7 +158,7 @@ int mdiobb_read(struct mii_bus *bus, int phy, int reg)
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reg = mdiobb_cmd_addr(ctrl, phy, reg);
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mdiobb_cmd(ctrl, MDIO_C45_READ, phy, reg);
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} else
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mdiobb_cmd(ctrl, MDIO_READ, phy, reg);
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mdiobb_cmd(ctrl, ctrl->op_c22_read, phy, reg);
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ctrl->ops->set_mdio_dir(ctrl, 0);
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@ -190,7 +190,7 @@ int mdiobb_write(struct mii_bus *bus, int phy, int reg, u16 val)
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reg = mdiobb_cmd_addr(ctrl, phy, reg);
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mdiobb_cmd(ctrl, MDIO_C45_WRITE, phy, reg);
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} else
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mdiobb_cmd(ctrl, MDIO_WRITE, phy, reg);
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mdiobb_cmd(ctrl, ctrl->op_c22_write, phy, reg);
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/* send the turnaround (10) */
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mdiobb_send_bit(ctrl, 1);
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@ -217,6 +217,10 @@ struct mii_bus *alloc_mdio_bitbang(struct mdiobb_ctrl *ctrl)
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bus->read = mdiobb_read;
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bus->write = mdiobb_write;
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bus->priv = ctrl;
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if (!ctrl->override_op_c22) {
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ctrl->op_c22_read = MDIO_READ;
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ctrl->op_c22_write = MDIO_WRITE;
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}
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return bus;
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}
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@ -132,6 +132,13 @@ static struct mii_bus *mdio_gpio_bus_init(struct device *dev,
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new_bus->phy_ignore_ta_mask = pdata->phy_ignore_ta_mask;
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}
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if (dev->of_node &&
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of_device_is_compatible(dev->of_node, "microchip,mdio-smi0")) {
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bitbang->ctrl.op_c22_read = 0;
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bitbang->ctrl.op_c22_write = 0;
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bitbang->ctrl.override_op_c22 = 1;
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}
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dev_set_drvdata(dev, new_bus);
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return new_bus;
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@ -196,6 +203,7 @@ static int mdio_gpio_remove(struct platform_device *pdev)
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static const struct of_device_id mdio_gpio_of_match[] = {
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{ .compatible = "virtual,mdio-gpio", },
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{ .compatible = "microchip,mdio-smi0" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, mdio_gpio_of_match);
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@ -33,6 +33,9 @@ struct mdiobb_ops {
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struct mdiobb_ctrl {
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const struct mdiobb_ops *ops;
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unsigned int override_op_c22;
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u8 op_c22_read;
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u8 op_c22_write;
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};
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int mdiobb_read(struct mii_bus *bus, int phy, int reg);
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