RE: [PATCH RFC net-next v2 09/12] net: ethernet: freescale: fec: Separate C22 and C45 transactions for xgmac

From: Wei Fang
Date: Tue Dec 27 2022 - 22:32:55 EST

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> -----Original Message-----
> From: Michael Walle <michael@xxxxxxxx>
> Sent: 2022年12月28日 7:07
> To: Heiner Kallweit <hkallweit1@xxxxxxxxx>; Russell King
> <linux@xxxxxxxxxxxxxxx>; David S. Miller <davem@xxxxxxxxxxxxx>; Eric
> Dumazet <edumazet@xxxxxxxxxx>; Jakub Kicinski <kuba@xxxxxxxxxx>; Paolo
> Abeni <pabeni@xxxxxxxxxx>; Jose Abreu <Jose.Abreu@xxxxxxxxxxxx>;
> Sergey Shtylyov <s.shtylyov@xxxxxx>; Wei Fang <wei.fang@xxxxxxx>;
> Shenwei Wang <shenwei.wang@xxxxxxx>; Clark Wang
> <xiaoning.wang@xxxxxxx>; dl-linux-imx <linux-imx@xxxxxxx>; Sean Wang
> <sean.wang@xxxxxxxxxxxx>; Landen Chao <Landen.Chao@xxxxxxxxxxxx>;
> DENG Qingfang <dqfext@xxxxxxxxx>; Florian Fainelli <f.fainelli@xxxxxxxxx>;
> Vladimir Oltean <olteanv@xxxxxxxxx>; Matthias Brugger
> <matthias.bgg@xxxxxxxxx>
> Cc: netdev@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> linux-renesas-soc@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> linux-mediatek@xxxxxxxxxxxxxxxxxxx; Andrew Lunn <andrew@xxxxxxx>; Geert
> Uytterhoeven <geert+renesas@xxxxxxxxx>; Michael Walle <michael@xxxxxxxx>
> Subject: [PATCH RFC net-next v2 09/12] net: ethernet: freescale: fec: Separate
> C22 and C45 transactions for xgmac
>
> From: Andrew Lunn <andrew@xxxxxxx>
>
> The fec MDIO bus driver can perform both C22 and C45 transfers.
> Create separate functions for each and register the C45 versions using
> the new API calls where appropriate.
>
> Signed-off-by: Andrew Lunn <andrew@xxxxxxx>
> Signed-off-by: Michael Walle <michael@xxxxxxxx>
> ---
> v2:
> - [al] Fixup some indentation
> ---
> drivers/net/ethernet/freescale/fec_main.c | 153
> ++++++++++++++++++++----------
> 1 file changed, 103 insertions(+), 50 deletions(-)
>
> diff --git a/drivers/net/ethernet/freescale/fec_main.c
> b/drivers/net/ethernet/freescale/fec_main.c
> index 644f3c963730..e6238e53940d 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -1987,47 +1987,74 @@ static int fec_enet_mdio_wait(struct
> fec_enet_private *fep)
> return ret;
> }
>
> -static int fec_enet_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
> +static int fec_enet_mdio_read_c22(struct mii_bus *bus, int mii_id, int
> regnum)
> {
> struct fec_enet_private *fep = bus->priv;
> struct device *dev = &fep->pdev->dev;
> int ret = 0, frame_start, frame_addr, frame_op;
> - bool is_c45 = !!(regnum & MII_ADDR_C45);
>
> ret = pm_runtime_resume_and_get(dev);
> if (ret < 0)
> return ret;
>
> - if (is_c45) {
> - frame_start = FEC_MMFR_ST_C45;
> + /* C22 read */
> + frame_op = FEC_MMFR_OP_READ;
> + frame_start = FEC_MMFR_ST;
> + frame_addr = regnum;
>
> - /* write address */
> - frame_addr = (regnum >> 16);
> - writel(frame_start | FEC_MMFR_OP_ADDR_WRITE |
> - FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(frame_addr) |
> - FEC_MMFR_TA | (regnum & 0xFFFF),
> - fep->hwp + FEC_MII_DATA);
> + /* start a read op */
> + writel(frame_start | frame_op |
> + FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(frame_addr) |
> + FEC_MMFR_TA, fep->hwp + FEC_MII_DATA);
>
> - /* wait for end of transfer */
> - ret = fec_enet_mdio_wait(fep);
> - if (ret) {
> - netdev_err(fep->netdev, "MDIO address write timeout\n");
> - goto out;
> - }
> + /* wait for end of transfer */
> + ret = fec_enet_mdio_wait(fep);
> + if (ret) {
> + netdev_err(fep->netdev, "MDIO read timeout\n");
> + goto out;
> + }
>
> - frame_op = FEC_MMFR_OP_READ_C45;
> + ret = FEC_MMFR_DATA(readl(fep->hwp + FEC_MII_DATA));
>
> - } else {
> - /* C22 read */
> - frame_op = FEC_MMFR_OP_READ;
> - frame_start = FEC_MMFR_ST;
> - frame_addr = regnum;
> +out:
> + pm_runtime_mark_last_busy(dev);
> + pm_runtime_put_autosuspend(dev);
> +
> + return ret;
> +}
> +
> +static int fec_enet_mdio_read_c45(struct mii_bus *bus, int mii_id,
> + int devad, int regnum)
> +{
> + struct fec_enet_private *fep = bus->priv;
> + struct device *dev = &fep->pdev->dev;
> + int ret = 0, frame_start, frame_op;
> +
> + ret = pm_runtime_resume_and_get(dev);
> + if (ret < 0)
> + return ret;
> +
> + frame_start = FEC_MMFR_ST_C45;
> +
> + /* write address */
> + writel(frame_start | FEC_MMFR_OP_ADDR_WRITE |
> + FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(devad) |
> + FEC_MMFR_TA | (regnum & 0xFFFF),
> + fep->hwp + FEC_MII_DATA);
> +
> + /* wait for end of transfer */
> + ret = fec_enet_mdio_wait(fep);
> + if (ret) {
> + netdev_err(fep->netdev, "MDIO address write timeout\n");
> + goto out;
> }
>
> + frame_op = FEC_MMFR_OP_READ_C45;
> +
> /* start a read op */
> writel(frame_start | frame_op |
> - FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(frame_addr) |
> - FEC_MMFR_TA, fep->hwp + FEC_MII_DATA);
> + FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(devad) |
> + FEC_MMFR_TA, fep->hwp + FEC_MII_DATA);
>
> /* wait for end of transfer */
> ret = fec_enet_mdio_wait(fep);
> @@ -2045,45 +2072,69 @@ static int fec_enet_mdio_read(struct mii_bus
> *bus, int mii_id, int regnum)
> return ret;
> }
>
> -static int fec_enet_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
> - u16 value)
> +static int fec_enet_mdio_write_c22(struct mii_bus *bus, int mii_id, int
> regnum,
> + u16 value)
> {
> struct fec_enet_private *fep = bus->priv;
> struct device *dev = &fep->pdev->dev;
> int ret, frame_start, frame_addr;
> - bool is_c45 = !!(regnum & MII_ADDR_C45);
>
> ret = pm_runtime_resume_and_get(dev);
> if (ret < 0)
> return ret;
>
> - if (is_c45) {
> - frame_start = FEC_MMFR_ST_C45;
> + /* C22 write */
> + frame_start = FEC_MMFR_ST;
> + frame_addr = regnum;
>
> - /* write address */
> - frame_addr = (regnum >> 16);
> - writel(frame_start | FEC_MMFR_OP_ADDR_WRITE |
> - FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(frame_addr) |
> - FEC_MMFR_TA | (regnum & 0xFFFF),
> - fep->hwp + FEC_MII_DATA);
> + /* start a write op */
> + writel(frame_start | FEC_MMFR_OP_WRITE |
> + FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(frame_addr) |
> + FEC_MMFR_TA | FEC_MMFR_DATA(value),
> + fep->hwp + FEC_MII_DATA);
>
> - /* wait for end of transfer */
> - ret = fec_enet_mdio_wait(fep);
> - if (ret) {
> - netdev_err(fep->netdev, "MDIO address write timeout\n");
> - goto out;
> - }
> - } else {
> - /* C22 write */
> - frame_start = FEC_MMFR_ST;
> - frame_addr = regnum;
> + /* wait for end of transfer */
> + ret = fec_enet_mdio_wait(fep);
> + if (ret)
> + netdev_err(fep->netdev, "MDIO write timeout\n");
> +
> + pm_runtime_mark_last_busy(dev);
> + pm_runtime_put_autosuspend(dev);
> +
> + return ret;
> +}
> +
> +static int fec_enet_mdio_write_c45(struct mii_bus *bus, int mii_id,
> + int devad, int regnum, u16 value)
> +{
> + struct fec_enet_private *fep = bus->priv;
> + struct device *dev = &fep->pdev->dev;
> + int ret, frame_start;
> +
> + ret = pm_runtime_resume_and_get(dev);
> + if (ret < 0)
> + return ret;
> +
> + frame_start = FEC_MMFR_ST_C45;
> +
> + /* write address */
> + writel(frame_start | FEC_MMFR_OP_ADDR_WRITE |
> + FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(devad) |
> + FEC_MMFR_TA | (regnum & 0xFFFF),
> + fep->hwp + FEC_MII_DATA);
> +
> + /* wait for end of transfer */
> + ret = fec_enet_mdio_wait(fep);
> + if (ret) {
> + netdev_err(fep->netdev, "MDIO address write timeout\n");
> + goto out;
> }
>
> /* start a write op */
> writel(frame_start | FEC_MMFR_OP_WRITE |
> - FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(frame_addr) |
> - FEC_MMFR_TA | FEC_MMFR_DATA(value),
> - fep->hwp + FEC_MII_DATA);
> + FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(devad) |
> + FEC_MMFR_TA | FEC_MMFR_DATA(value),
> + fep->hwp + FEC_MII_DATA);
>
> /* wait for end of transfer */
> ret = fec_enet_mdio_wait(fep);
> @@ -2381,8 +2432,10 @@ static int fec_enet_mii_init(struct platform_device
> *pdev)
> }
>
> fep->mii_bus->name = "fec_enet_mii_bus";
> - fep->mii_bus->read = fec_enet_mdio_read;
> - fep->mii_bus->write = fec_enet_mdio_write;
> + fep->mii_bus->read = fec_enet_mdio_read_c22;
> + fep->mii_bus->write = fec_enet_mdio_write_c22;
> + fep->mii_bus->read_c45 = fec_enet_mdio_read_c45;
> + fep->mii_bus->write_c45 = fec_enet_mdio_write_c45;
> snprintf(fep->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
> pdev->name, fep->dev_id + 1);
> fep->mii_bus->priv = fep;
>

It looks good to me.
Reviewed-by: Wei Fang <wei.fang@xxxxxxx>

Next message: Kees Cook: "Re: [PATCH v3 2/2] tty: Allow TIOCSTI to be disabled"
Previous message: Yong-Xuan Wang: "[PATCH -next v3] drivers: base: cacheinfo: fix shared_cpu_map"
In reply to: Michael Walle: "[PATCH RFC net-next v2 09/12] net: ethernet: freescale: fec: Separate C22 and C45 transactions for xgmac"
Next in thread: Michael Walle: "[PATCH RFC net-next v2 10/12] net: mdio: add mdiobus_c45_read/write_nested helpers"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]