Messages in this thread Patch in this message | | | From | Marco Hartmann <> | Subject | [PATCH net-next 1/1] fec: add C45 MDIO read/write support | Date | Mon, 19 Aug 2019 17:11:14 +0000 |
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IEEE 802.3ae clause 45 defines a modified MDIO protocol that uses a two staged access model in order to increase the address space.
This patch adds support for C45 MDIO read and write accesses, which are used whenever the MII_ADDR_C45 flag in the regnum argument is set. In case it is not set, C22 accesses are used as before.
Co-developed-by: Christian Herber <christian.herber@nxp.com> Signed-off-by: Christian Herber <christian.herber@nxp.com> Signed-off-by: Marco Hartmann <marco.hartmann@nxp.com> --- drivers/net/ethernet/freescale/fec_main.c | 65 ++++++++++++++++++++++++++++--- 1 file changed, 59 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c index c01d3ec3e9af..73f8f9a149a1 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -208,8 +208,11 @@ MODULE_PARM_DESC(macaddr, "FEC Ethernet MAC address"); /* FEC MII MMFR bits definition */ #define FEC_MMFR_ST (1 << 30) +#define FEC_MMFR_ST_C45 (0) #define FEC_MMFR_OP_READ (2 << 28) +#define FEC_MMFR_OP_READ_C45 (3 << 28) #define FEC_MMFR_OP_WRITE (1 << 28) +#define FEC_MMFR_OP_ADDR_WRITE (0) #define FEC_MMFR_PA(v) ((v & 0x1f) << 23) #define FEC_MMFR_RA(v) ((v & 0x1f) << 18) #define FEC_MMFR_TA (2 << 16) @@ -1767,7 +1770,7 @@ static int fec_enet_mdio_read(struct mii_bus *bus, int mii_id, int regnum) struct fec_enet_private *fep = bus->priv; struct device *dev = &fep->pdev->dev; unsigned long time_left; - int ret = 0; + int ret = 0, frame_start, frame_addr, frame_op; ret = pm_runtime_get_sync(dev); if (ret < 0) @@ -1775,9 +1778,36 @@ static int fec_enet_mdio_read(struct mii_bus *bus, int mii_id, int regnum) reinit_completion(&fep->mdio_done); + if (MII_ADDR_C45 & regnum) { + frame_start = FEC_MMFR_ST_C45; + + /* 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); + + /* wait for end of transfer */ + time_left = wait_for_completion_timeout(&fep->mdio_done, + usecs_to_jiffies(FEC_MII_TIMEOUT)); + if (time_left == 0) { + netdev_err(fep->netdev, "MDIO address write timeout\n"); + ret = -ETIMEDOUT; + } + + frame_op = FEC_MMFR_OP_READ_C45; + + } else { + /* C22 read */ + frame_op = FEC_MMFR_OP_READ; + frame_start = FEC_MMFR_ST; + frame_addr = regnum; + } + /* start a read op */ - writel(FEC_MMFR_ST | FEC_MMFR_OP_READ | - FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(regnum) | + 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 */ @@ -1804,7 +1834,7 @@ static int fec_enet_mdio_write(struct mii_bus *bus, int mii_id, int regnum, struct fec_enet_private *fep = bus->priv; struct device *dev = &fep->pdev->dev; unsigned long time_left; - int ret; + int ret, frame_start, frame_addr; ret = pm_runtime_get_sync(dev); if (ret < 0) @@ -1814,9 +1844,32 @@ static int fec_enet_mdio_write(struct mii_bus *bus, int mii_id, int regnum, reinit_completion(&fep->mdio_done); + if (MII_ADDR_C45 & regnum) { + frame_start = FEC_MMFR_ST_C45; + + /* 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); + + /* wait for end of transfer */ + time_left = wait_for_completion_timeout(&fep->mdio_done, + usecs_to_jiffies(FEC_MII_TIMEOUT)); + if (time_left == 0) { + netdev_err(fep->netdev, "MDIO address write timeout\n"); + ret = -ETIMEDOUT; + } + } else { + /* C22 write */ + frame_start = FEC_MMFR_ST; + frame_addr = regnum; + } + /* start a write op */ - writel(FEC_MMFR_ST | FEC_MMFR_OP_WRITE | - FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(regnum) | + 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); -- 2.7.4
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