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b34d048a62
With the new kernel the MDIO bus gets created after the smbus read/write functions are used. Make use of native functions. Relocate bus initialization into a separate function to make patch easier to read. Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
128 lines
3.0 KiB
Diff
128 lines
3.0 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 | 92 +++++++++++++++++++++++++++++++++++++++++--
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1 file changed, 88 insertions(+), 4 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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@@ -662,10 +662,64 @@ 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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+ union i2c_smbus_data data;
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+ int ret;
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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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+ ret = i2c_smbus_xfer(sfp->i2c, i2c_mii_phy_addr(bus_addr), 0,
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+ I2C_SMBUS_READ, dev_addr,
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+ I2C_SMBUS_BYTE_DATA, &data);
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+ if (ret)
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+ return ret;
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+ *val++ = data.byte;
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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, *val = buf;
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+ union i2c_smbus_data data;
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+ int ret;
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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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+ data.byte = *val++;
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+ ret = i2c_smbus_xfer(sfp->i2c, i2c_mii_phy_addr(bus_addr), 0,
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+ I2C_SMBUS_WRITE, dev_addr,
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+ I2C_SMBUS_BYTE_DATA, &data);
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+ if (ret)
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+ return ret;
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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_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c)
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{
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- if (!i2c_check_functionality(i2c, I2C_FUNC_I2C))
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- return -EINVAL;
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+ if (!i2c_check_functionality(i2c, I2C_FUNC_I2C)) {
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+ if (i2c_check_functionality(i2c, I2C_FUNC_SMBUS_BYTE_DATA)) {
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+ sfp->i2c = i2c;
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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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+ return 0;
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+ } else
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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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@@ -697,6 +751,29 @@ static int sfp_i2c_mdiobus_create(struct
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return 0;
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}
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+static int sfp_sm_mdiobus_create(struct sfp *sfp)
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+{
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+ struct mii_bus *sm_mii;
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+ int ret;
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+
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+ sm_mii = mdio_smbus_alloc(sfp->dev, sfp->i2c);
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+ if (IS_ERR(sm_mii))
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+ return PTR_ERR(sm_mii);
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+
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+ sm_mii->name = "SFP SMBus";
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+ sm_mii->phy_mask = ~0;
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+
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+ ret = mdiobus_register(sm_mii);
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+ if (ret < 0) {
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+ mdiobus_free(sm_mii);
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+ return ret;
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+ }
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+
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+ sfp->i2c_mii = sm_mii;
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+
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+ return 0;
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+}
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+
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static void sfp_i2c_mdiobus_destroy(struct sfp *sfp)
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{
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mdiobus_unregister(sfp->i2c_mii);
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@@ -1870,8 +1947,15 @@ static void sfp_sm_fault(struct sfp *sfp
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static int sfp_sm_add_mdio_bus(struct sfp *sfp)
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{
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- if (sfp->mdio_protocol != MDIO_I2C_NONE)
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- return sfp_i2c_mdiobus_create(sfp);
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+ if (i2c_check_functionality(sfp->i2c, I2C_FUNC_I2C)) {
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+ if (sfp->mdio_protocol != MDIO_I2C_NONE)
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+ return sfp_i2c_mdiobus_create(sfp);
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+
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+ return 0;
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+ }
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+
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+ if (i2c_check_functionality(sfp->i2c, I2C_FUNC_SMBUS_BYTE_DATA))
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+ return sfp_sm_mdiobus_create(sfp);
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return 0;
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}
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