100 lines
2.3 KiB
Diff
100 lines
2.3 KiB
Diff
From 3cb0bde365d913c484d20224367a54a0eac780a7 Mon Sep 17 00:00:00 2001
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From: Antoine Tenart <antoine.tenart@bootlin.com>
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Date: Fri, 21 Feb 2020 11:55:29 +0100
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Subject: [PATCH 3/3] net: phy: sfp: add support for SMBus
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Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
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---
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drivers/net/phy/sfp.c | 68 ++++++++++++++++++++++++++++++++++---------
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1 file changed, 54 insertions(+), 14 deletions(-)
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--- a/drivers/net/phy/sfp.c
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+++ b/drivers/net/phy/sfp.c
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@@ -413,32 +413,72 @@ static int sfp_i2c_write(struct sfp *sfp
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return ret == ARRAY_SIZE(msgs) ? len : 0;
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}
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+static int sfp_smbus_read(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
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+ size_t len)
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+{
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+ u8 bus_addr = a2 ? 0x51 : 0x50, *val = buf;
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+
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+ bus_addr -= 0x40;
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+
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+ while (len > 0) {
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+ *val = sfp->i2c_mii->read(sfp->i2c_mii, bus_addr, dev_addr);
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+
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+ val++;
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+ dev_addr++;
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+ len--;
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+ }
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+
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+ return val - (u8 *)buf;
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+}
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+
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+static int sfp_smbus_write(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
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+ size_t len)
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+{
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+ u8 bus_addr = a2 ? 0x51 : 0x50;
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+ u16 val;
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+
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+ memcpy(&val, buf, len);
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+
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+ return sfp->i2c_mii->write(sfp->i2c_mii, bus_addr, dev_addr, val);
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+}
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+
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static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c)
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{
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- struct mii_bus *i2c_mii;
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+ struct mii_bus *mii;
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int ret;
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- if (!i2c_check_functionality(i2c, I2C_FUNC_I2C))
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- return -EINVAL;
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-
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sfp->i2c = i2c;
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- sfp->read = sfp_i2c_read;
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- sfp->write = sfp_i2c_write;
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- i2c_mii = mdio_i2c_alloc(sfp->dev, i2c);
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- if (IS_ERR(i2c_mii))
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- return PTR_ERR(i2c_mii);
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+ if (i2c_check_functionality(i2c, I2C_FUNC_I2C)) {
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+ sfp->read = sfp_i2c_read;
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+ sfp->write = sfp_i2c_write;
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+
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+ mii = mdio_i2c_alloc(sfp->dev, i2c);
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+ if (IS_ERR(mii))
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+ return PTR_ERR(mii);
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+
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+ mii->name = "SFP I2C Bus";
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+ } else if (i2c_check_functionality(i2c, I2C_FUNC_SMBUS_BYTE_DATA)) {
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+ sfp->read = sfp_smbus_read;
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+ sfp->write = sfp_smbus_write;
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+
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+ mii = mdio_smbus_alloc(sfp->dev, i2c);
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+ if (IS_ERR(mii))
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+ return PTR_ERR(mii);
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- i2c_mii->name = "SFP I2C Bus";
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- i2c_mii->phy_mask = ~0;
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+ mii->name = "SFP SMBus";
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+ } else {
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+ return -EINVAL;
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+ }
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- ret = mdiobus_register(i2c_mii);
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+ mii->phy_mask = ~0;
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+ ret = mdiobus_register(mii);
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if (ret < 0) {
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- mdiobus_free(i2c_mii);
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+ mdiobus_free(mii);
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return ret;
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}
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- sfp->i2c_mii = i2c_mii;
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+ sfp->i2c_mii = mii;
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return 0;
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}
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