netdev - Re: [PATCH net-next 4/5] net: ngbe: Initialize phy information

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Date:   Tue, 8 Nov 2022 22:10:57 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Mengyuan Lou <mengyuanlou@...-swift.com>
Cc:     netdev@...r.kernel.org, jiawenwu@...stnetic.com
Subject: Re: [PATCH net-next 4/5] net: ngbe: Initialize phy information

> +/**
> + *  ngbe_phy_read_reg_mdi - Reads a val from an external PHY register
> + *  @hw: pointer to hardware structure
> + *  @reg_addr: 32 bit address of PHY register to read
> + **/
> +static u16 ngbe_phy_read_reg_mdi(struct ngbe_hw *hw, u32 reg_addr)
> +{
> +	u32 command = 0, device_type = 0;
> +	struct wx_hw *wxhw = &hw->wxhw;
> +	u32 phy_addr = 0;
> +	u16 phy_data = 0;
> +	u32 val = 0;
> +	int ret = 0;
> +
> +	/* setup and write the address cycle command */
> +	command = NGBE_MSCA_RA(reg_addr) |
> +		  NGBE_MSCA_PA(phy_addr) |
> +		  NGBE_MSCA_DA(device_type);
> +	wr32(wxhw, NGBE_MSCA, command);
> +
> +	command = NGBE_MSCC_CMD(NGBE_MSCA_CMD_READ) |
> +		  NGBE_MSCC_BUSY |
> +		  NGBE_MDIO_CLK(6);
> +	wr32(wxhw, NGBE_MSCC, command);
> +
> +	/* wait to complete */
> +	ret = read_poll_timeout(rd32, val, val & NGBE_MSCC_BUSY, 1000,
> +				20000, false, wxhw, NGBE_MSCC);
> +	if (ret)
> +		wx_dbg(wxhw, "PHY address command did not complete.\n");
> +
> +	/* read data from MSCC */
> +	phy_data = (u16)rd32(wxhw, NGBE_MSCC);
> +
> +	return phy_data;
> +}
> +
> +/**
> + *  ngbe_phy_write_reg_mdi - Writes a val to external PHY register
> + *  @hw: pointer to hardware structure
> + *  @reg_addr: 32 bit PHY register to write
> + *  @phy_data: Data to write to the PHY register
> + **/
> +static void ngbe_phy_write_reg_mdi(struct ngbe_hw *hw, u32 reg_addr, u16 phy_data)
> +{
> +	u32 command = 0, device_type = 0;
> +	struct wx_hw *wxhw = &hw->wxhw;
> +	u32 phy_addr = 0;
> +	int ret = 0;
> +	u16 val = 0;
> +
> +	/* setup and write the address cycle command */
> +	command = NGBE_MSCA_RA(reg_addr) |
> +		  NGBE_MSCA_PA(phy_addr) |
> +		  NGBE_MSCA_DA(device_type);
> +	wr32(wxhw, NGBE_MSCA, command);
> +
> +	command = phy_data |
> +		  NGBE_MSCC_CMD(NGBE_MSCA_CMD_WRITE) |
> +		  NGBE_MSCC_BUSY |
> +		  NGBE_MDIO_CLK(6);
> +	wr32(wxhw, NGBE_MSCC, command);
> +
> +	/* wait to complete */
> +	ret = read_poll_timeout(rd32, val, val & NGBE_MSCC_BUSY, 1000,
> +				20000, false, wxhw, NGBE_MSCC);
> +	if (ret)
> +		wx_dbg(wxhw, "PHY address command did not complete.\n");
> +}

This appears to be an MDIO bus? Although you seem to be limited to
just 1 of the 32 addresses? Anyway, please create a standard Linux
MDIO bus driver. The Linux PHY drivers will then drive the PHYs for
you. You can throw most of this file away.

	Andrew