The ksz9477 Linux kernel driver is based on regmap API to seamlessly communicate to switch devices connected via different buses like SPI or I2C. The current regmap implementation in U-Boot only supports memory-mapped registers access [1].
Until regmap API with bus support is available in U-boot, introduce struct ksz_phy_ops to store low-level ksz bus operations (I2C for now). [1] https://lists.denx.de/pipermail/u-boot/2018-May/329392.html Signed-off-by: Romain Naour <romain.na...@smile.fr> --- drivers/net/ksz9477.c | 92 ++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 86 insertions(+), 6 deletions(-) diff --git a/drivers/net/ksz9477.c b/drivers/net/ksz9477.c index ce9d4b8753f..f24bf9943e7 100644 --- a/drivers/net/ksz9477.c +++ b/drivers/net/ksz9477.c @@ -71,15 +71,61 @@ #define MMD_SETUP(mode, dev) (((u16)(mode) << PORT_MMD_OP_MODE_S) | (dev)) #define REG_PORT_PHY_MMD_INDEX_DATA 0x011C +/** + * struct ksz_phy_ops - low-level KSZ bus operations + */ +struct ksz_phy_ops { + /* read() - Read bytes from the device + * + * @udev: bus device + * @reg: register offset + * @val: data read + * @len: Number of bytes to read + * + * @return: 0 on success, negative on failure + */ + int (*read)(struct udevice *udev, u32 reg, u8 *val, int len); + + /* write() - Write bytes to the device + * + * @udev: bus device + * @reg: register offset + * @val: data to write + * @len: Number of bytes to write + * + * @return: 0 on success, negative on failure + */ + int (*write)(struct udevice *udev, u32 reg, u8 *val, int len); +}; + struct ksz_dsa_priv { struct udevice *dev; + struct ksz_phy_ops *phy_ops; u32 features; /* chip specific features */ }; +static inline int ksz_i2c_read(struct udevice *dev, u32 reg, u8 *val, int len) +{ + return dm_i2c_read(dev, reg, val, len); +} + +static inline int ksz_i2c_write(struct udevice *dev, u32 reg, u8 *val, int len) +{ + return dm_i2c_write(dev, reg, val, len); +} + +static struct ksz_phy_ops phy_i2c_ops = { + .read = ksz_i2c_read, + .write = ksz_i2c_write, +}; + static inline int ksz_read8(struct udevice *dev, u32 reg, u8 *val) { - int ret = dm_i2c_read(dev, reg, val, 1); + struct ksz_dsa_priv *priv = dev_get_priv(dev); + struct ksz_phy_ops *phy_ops = priv->phy_ops; + + int ret = phy_ops->read(dev, reg, val, 1); dev_dbg(dev, "%s 0x%04x<<0x%02x\n", __func__, reg, *val); @@ -93,8 +139,11 @@ static inline int ksz_pread8(struct udevice *dev, int port, int reg, u8 *val) static inline int ksz_write8(struct udevice *dev, u32 reg, u8 val) { + struct ksz_dsa_priv *priv = dev_get_priv(dev); + struct ksz_phy_ops *phy_ops = priv->phy_ops; + dev_dbg(dev, "%s 0x%04x>>0x%02x\n", __func__, reg, val); - return dm_i2c_write(dev, reg, &val, 1); + return phy_ops->write(dev, reg, &val, 1); } static inline int ksz_pwrite8(struct udevice *dev, int port, int reg, u8 val) @@ -104,13 +153,15 @@ static inline int ksz_pwrite8(struct udevice *dev, int port, int reg, u8 val) static inline int ksz_write16(struct udevice *dev, u32 reg, u16 val) { + struct ksz_dsa_priv *priv = dev_get_priv(dev); + struct ksz_phy_ops *phy_ops = priv->phy_ops; u8 buf[2]; buf[1] = val & 0xff; buf[0] = val >> 8; dev_dbg(dev, "%s 0x%04x>>0x%04x\n", __func__, reg, val); - return dm_i2c_write(dev, reg, buf, 2); + return phy_ops->write(dev, reg, buf, 2); } static inline int ksz_pwrite16(struct udevice *dev, int port, int reg, u16 val) @@ -120,10 +171,12 @@ static inline int ksz_pwrite16(struct udevice *dev, int port, int reg, u16 val) static inline int ksz_read16(struct udevice *dev, u32 reg, u16 *val) { + struct ksz_dsa_priv *priv = dev_get_priv(dev); + struct ksz_phy_ops *phy_ops = priv->phy_ops; u8 buf[2]; int ret; - ret = dm_i2c_read(dev, reg, buf, 2); + ret = phy_ops->read(dev, reg, buf, 2); *val = (buf[0] << 8) | buf[1]; dev_dbg(dev, "%s 0x%04x<<0x%04x\n", __func__, reg, *val); @@ -137,7 +190,10 @@ static inline int ksz_pread16(struct udevice *dev, int port, int reg, u16 *val) static inline int ksz_read32(struct udevice *dev, u32 reg, u32 *val) { - return dm_i2c_read(dev, reg, (u8 *)val, 4); + struct ksz_dsa_priv *priv = dev_get_priv(dev); + struct ksz_phy_ops *phy_ops = priv->phy_ops; + + return phy_ops->read(dev, reg, (u8 *)val, 4); } static inline int ksz_pread32(struct udevice *dev, int port, int reg, u32 *val) @@ -147,6 +203,8 @@ static inline int ksz_pread32(struct udevice *dev, int port, int reg, u32 *val) static inline int ksz_write32(struct udevice *dev, u32 reg, u32 val) { + struct ksz_dsa_priv *priv = dev_get_priv(dev); + struct ksz_phy_ops *phy_ops = priv->phy_ops; u8 buf[4]; buf[3] = val & 0xff; @@ -155,7 +213,7 @@ static inline int ksz_write32(struct udevice *dev, u32 reg, u32 val) buf[0] = (val >> 8) & 0xff; dev_dbg(dev, "%s 0x%04x>>0x%04x\n", __func__, reg, val); - return dm_i2c_write(dev, reg, buf, 4); + return phy_ops->write(dev, reg, buf, 4); } static inline int ksz_pwrite32(struct udevice *dev, int port, int reg, u32 val) @@ -503,6 +561,21 @@ static int ksz_probe_mdio(struct udevice *dev) return 0; } +static void ksz_ops_register(struct udevice *dev, struct ksz_phy_ops *ops) +{ + struct ksz_dsa_priv *priv = dev_get_priv(dev); + + priv->phy_ops = ops; +} + +static bool dsa_ksz_check_ops(struct ksz_phy_ops *phy_ops) +{ + if (!phy_ops || !phy_ops->read || !phy_ops->write) + return false; + + return true; +} + /* * I2C driver */ @@ -518,6 +591,8 @@ static int ksz_i2c_probe(struct udevice *dev) parent_id = device_get_uclass_id(dev_get_parent(dev)); switch (parent_id) { case UCLASS_I2C: { + ksz_ops_register(dev, &phy_i2c_ops); + ret = i2c_set_chip_offset_len(dev, 2); if (ret) { printf("i2c_set_chip_offset_len failed: %d\n", ret); @@ -531,6 +606,11 @@ static int ksz_i2c_probe(struct udevice *dev) return -EINVAL; } + if (!dsa_ksz_check_ops(priv->phy_ops)) { + printf("Driver bug. No bus ops defined\n"); + return -EINVAL; + } + /* default config */ priv->dev = dev; -- 2.45.0
