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Date: Thu, 2 Jul 2020 15:35:45 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Robert Marko <robert.marko@...tura.hr>
Cc: f.fainelli@...il.com, hkallweit1@...il.com, linux@...linux.org.uk,
davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
agross@...nel.org, bjorn.andersson@...aro.org, robh+dt@...nel.org
Subject: Re: [net-next,PATCH 3/4] net: mdio-ipq4019: add Clause 45 support
On Thu, Jul 02, 2020 at 12:30:00PM +0200, Robert Marko wrote:
> While up-streaming the IPQ4019 driver it was thought that the controller had no Clause 45 support,
> but it actually does and its activated by writing a bit to the mode register.
>
> So lets add it as newer SoC-s use the same controller and Clause 45 compliant PHY-s.
>
> Signed-off-by: Robert Marko <robert.marko@...tura.hr>
> ---
> drivers/net/phy/mdio-ipq4019.c | 109 ++++++++++++++++++++++++++++-----
> 1 file changed, 92 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/net/phy/mdio-ipq4019.c b/drivers/net/phy/mdio-ipq4019.c
> index 7660bf006da0..9143113d5a6b 100644
> --- a/drivers/net/phy/mdio-ipq4019.c
> +++ b/drivers/net/phy/mdio-ipq4019.c
> @@ -13,6 +13,7 @@
> #include <linux/phy.h>
> #include <linux/platform_device.h>
>
> +#define MDIO_MODE_REG 0x40
> #define MDIO_ADDR_REG 0x44
> #define MDIO_DATA_WRITE_REG 0x48
> #define MDIO_DATA_READ_REG 0x4c
> @@ -21,6 +22,12 @@
> #define MDIO_CMD_ACCESS_START BIT(8)
> #define MDIO_CMD_ACCESS_CODE_READ 0
> #define MDIO_CMD_ACCESS_CODE_WRITE 1
> +#define MDIO_CMD_ACCESS_CODE_C45_ADDR 0
> +#define MDIO_CMD_ACCESS_CODE_C45_WRITE 1
> +#define MDIO_CMD_ACCESS_CODE_C45_READ 2
> +
> +/* 0 = Clause 22, 1 = Clause 45 */
> +#define MDIO_MODE_BIT BIT(8)
>
> #define IPQ4019_MDIO_TIMEOUT 10000
> #define IPQ4019_MDIO_SLEEP 10
> @@ -39,7 +46,7 @@ static int ipq4019_mdio_wait_busy(struct mii_bus *bus)
> unsigned int busy;
>
> return readl_poll_timeout(priv->membase + MDIO_CMD_REG, busy,
> - (busy & MDIO_CMD_ACCESS_BUSY) == 0,
> + (busy & MDIO_CMD_ACCESS_BUSY) == 0,
> IPQ4019_MDIO_SLEEP, IPQ4019_MDIO_TIMEOUT);
> }
Please put white space changes into a separate patch.
>
> @@ -47,18 +54,43 @@ static int ipq4019_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
> {
> struct ipq4019_mdio_data *priv = bus->priv;
> unsigned int cmd;
> -
> - /* Reject clause 45 */
> - if (regnum & MII_ADDR_C45)
> - return -EOPNOTSUPP;
> + unsigned int data;
Reverse Christmas tree please.
>
> if (ipq4019_mdio_wait_busy(bus))
> return -ETIMEDOUT;
>
> - /* issue the phy address and reg */
> - writel((mii_id << 8) | regnum, priv->membase + MDIO_ADDR_REG);
> + /* Clause 45 support */
> + if (regnum & MII_ADDR_C45) {
> + unsigned int mmd = (regnum >> 16) & 0x1F;
> + unsigned int reg = regnum & 0xFFFF;
> +
> + /* Enter Clause 45 mode */
> + data = readl(priv->membase + MDIO_MODE_REG);
> +
> + data |= MDIO_MODE_BIT;
> +
> + writel(data, priv->membase + MDIO_MODE_REG);
> +
> + /* issue the phy address and mmd */
> + writel((mii_id << 8) | mmd, priv->membase + MDIO_ADDR_REG);
> +
> + /* issue reg */
> + writel(reg, priv->membase + MDIO_DATA_WRITE_REG);
> +
> + cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_ADDR;
> + } else {
> + /* Enter Clause 22 mode */
> + data = readl(priv->membase + MDIO_MODE_REG);
>
> - cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_READ;
> + data &= ~MDIO_MODE_BIT;
> +
> + writel(data, priv->membase + MDIO_MODE_REG);
> +
> + /* issue the phy address and reg */
> + writel((mii_id << 8) | regnum, priv->membase + MDIO_ADDR_REG);
> +
> + cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_READ;
> + }
>
> /* issue read command */
> writel(cmd, priv->membase + MDIO_CMD_REG);
> @@ -67,6 +99,15 @@ static int ipq4019_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
> if (ipq4019_mdio_wait_busy(bus))
> return -ETIMEDOUT;
>
> + if (regnum & MII_ADDR_C45) {
> + cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_READ;
> +
> + writel(cmd, priv->membase + MDIO_CMD_REG);
> +
> + if (ipq4019_mdio_wait_busy(bus))
> + return -ETIMEDOUT;
> + }
> +
> /* Read and return data */
> return readl(priv->membase + MDIO_DATA_READ_REG);
> }
> @@ -76,22 +117,56 @@ static int ipq4019_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
> {
> struct ipq4019_mdio_data *priv = bus->priv;
> unsigned int cmd;
> -
> - /* Reject clause 45 */
> - if (regnum & MII_ADDR_C45)
> - return -EOPNOTSUPP;
> + unsigned int data;
>
> if (ipq4019_mdio_wait_busy(bus))
> return -ETIMEDOUT;
>
> - /* issue the phy address and reg */
> - writel((mii_id << 8) | regnum, priv->membase + MDIO_ADDR_REG);
> + /* Clause 45 support */
> + if (regnum & MII_ADDR_C45) {
> + unsigned int mmd = (regnum >> 16) & 0x1F;
> + unsigned int reg = regnum & 0xFFFF;
> +
> + /* Enter Clause 45 mode */
> + data = readl(priv->membase + MDIO_MODE_REG);
> +
> + data |= MDIO_MODE_BIT;
> +
> + writel(data, priv->membase + MDIO_MODE_REG);
> +
> + /* issue the phy address and mmd */
> + writel((mii_id << 8) | mmd, priv->membase + MDIO_ADDR_REG);
> +
> + /* issue reg */
> + writel(reg, priv->membase + MDIO_DATA_WRITE_REG);
> +
> + cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_ADDR;
> +
> + writel(cmd, priv->membase + MDIO_CMD_REG);
> +
> + if (ipq4019_mdio_wait_busy(bus))
> + return -ETIMEDOUT;
> + } else {
> + /* Enter Clause 22 mode */
> + data = readl(priv->membase + MDIO_MODE_REG);
> +
> + data &= ~MDIO_MODE_BIT;
> +
> + writel(data, priv->membase + MDIO_MODE_REG);
> +
> + /* issue the phy address and reg */
> + writel((mii_id << 8) | regnum, priv->membase + MDIO_ADDR_REG);
> + }
>
> /* issue write data */
> writel(value, priv->membase + MDIO_DATA_WRITE_REG);
> -
> - cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_WRITE;
> +
> /* issue write command */
> + if (regnum & MII_ADDR_C45)
> + cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_WRITE;
> + else
> + cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_WRITE;
> +
> writel(cmd, priv->membase + MDIO_CMD_REG);
>
> /* Wait write complete */
> @@ -105,7 +180,7 @@ static int ipq4019_mdio_probe(struct platform_device *pdev)
> {
> struct ipq4019_mdio_data *priv;
> struct mii_bus *bus;
> - struct device_node *np = pdev->dev.of_node;
> + struct device_node *np = pdev->dev.of_node;
> int ret;
Another white space change.
Andrew
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