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https://github.com/openwrt/openwrt.git
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f938826a65
Rework exposing i2c_mii_valid_phy_id and i2c_mii_phy_addr in global
include.
Fix compilation warning:
In file included from drivers/net/phy/sfp.c:11:
./include/linux/mdio/mdio-i2c.h:27:21: error: 'i2c_mii_phy_addr' defined but not used [-Werror=unused-function]
27 | static unsigned int i2c_mii_phy_addr(int phy_id)
| ^~~~~~~~~~~~~~~~
./include/linux/mdio/mdio-i2c.h:22:13: error: 'i2c_mii_valid_phy_id' defined but not used [-Werror=unused-function]
22 | static bool i2c_mii_valid_phy_id(int phy_id)
| ^~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
149 lines
4.2 KiB
Diff
149 lines
4.2 KiB
Diff
From d585c55b9f70cf9e8c66820d7efe7130c683f19e 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 11:51:27 +0100
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Subject: [PATCH 2/3] net: phy: add an MDIO SMBus library
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Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
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---
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drivers/net/mdio/Kconfig | 11 +++++++
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drivers/net/mdio/Makefile | 1 +
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drivers/net/mdio/mdio-smbus.c | 62 +++++++++++++++++++++++++++++++++++
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drivers/net/phy/Kconfig | 1 +
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include/linux/mdio/mdio-i2c.h | 16 +++++++++
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5 files changed, 91 insertions(+)
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create mode 100644 drivers/net/mdio/mdio-smbus.c
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--- a/drivers/net/mdio/Kconfig
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+++ b/drivers/net/mdio/Kconfig
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@@ -54,6 +54,17 @@ config MDIO_SUN4I
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interface units of the Allwinner SoC that have an EMAC (A10,
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A12, A10s, etc.)
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+config MDIO_SMBUS
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+ tristate
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+ depends on I2C_SMBUS
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+ help
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+ Support SMBus based PHYs. This provides a MDIO bus bridged
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+ to SMBus to allow PHYs connected in SMBus mode to be accessed
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+ using the existing infrastructure.
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+
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+ This is library mode.
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+
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+
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config MDIO_XGENE
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tristate "APM X-Gene SoC MDIO bus controller"
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depends on ARCH_XGENE || COMPILE_TEST
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--- a/drivers/net/mdio/Makefile
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+++ b/drivers/net/mdio/Makefile
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@@ -19,6 +19,7 @@ obj-$(CONFIG_MDIO_MOXART) += mdio-moxar
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obj-$(CONFIG_MDIO_MSCC_MIIM) += mdio-mscc-miim.o
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obj-$(CONFIG_MDIO_MVUSB) += mdio-mvusb.o
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obj-$(CONFIG_MDIO_OCTEON) += mdio-octeon.o
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+obj-$(CONFIG_MDIO_SMBUS) += mdio-smbus.o
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obj-$(CONFIG_MDIO_SUN4I) += mdio-sun4i.o
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obj-$(CONFIG_MDIO_THUNDER) += mdio-thunder.o
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obj-$(CONFIG_MDIO_XGENE) += mdio-xgene.o
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--- /dev/null
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+++ b/drivers/net/mdio/mdio-smbus.c
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@@ -0,0 +1,62 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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+/*
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+ * MDIO SMBus bridge
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+ *
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+ * Copyright (C) 2020 Antoine Tenart
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+ *
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+ * Network PHYs can appear on SMBus when they are part of SFP modules.
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+ */
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+#include <linux/i2c.h>
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+#include <linux/phy.h>
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+#include <linux/mdio/mdio-i2c.h>
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+
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+static int smbus_mii_read(struct mii_bus *mii, int phy_id, int reg)
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+{
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+ struct i2c_adapter *i2c = mii->priv;
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+ union i2c_smbus_data data;
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+ int ret;
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+
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+ ret = i2c_smbus_xfer(i2c, i2c_mii_phy_addr(phy_id), 0, I2C_SMBUS_READ,
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+ reg, I2C_SMBUS_BYTE_DATA, &data);
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+ if (ret < 0)
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+ return 0xff;
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+
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+ return data.byte;
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+}
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+
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+static int smbus_mii_write(struct mii_bus *mii, int phy_id, int reg, u16 val)
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+{
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+ struct i2c_adapter *i2c = mii->priv;
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+ union i2c_smbus_data data;
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+ int ret;
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+
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+ data.byte = val;
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+
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+ ret = i2c_smbus_xfer(i2c, i2c_mii_phy_addr(phy_id), 0, I2C_SMBUS_WRITE,
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+ reg, I2C_SMBUS_BYTE_DATA, &data);
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+ return ret < 0 ? ret : 0;
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+}
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+
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+struct mii_bus *mdio_smbus_alloc(struct device *parent, struct i2c_adapter *i2c)
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+{
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+ struct mii_bus *mii;
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+
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+ if (!i2c_check_functionality(i2c, I2C_FUNC_SMBUS_BYTE_DATA))
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+ return ERR_PTR(-EINVAL);
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+
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+ mii = mdiobus_alloc();
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+ if (!mii)
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+ return ERR_PTR(-ENOMEM);
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+
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+ snprintf(mii->id, MII_BUS_ID_SIZE, "smbus:%s", dev_name(parent));
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+ mii->parent = parent;
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+ mii->read = smbus_mii_read;
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+ mii->write = smbus_mii_write;
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+ mii->priv = i2c;
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+
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+ return mii;
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+}
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+
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+MODULE_AUTHOR("Antoine Tenart");
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+MODULE_DESCRIPTION("MDIO SMBus bridge library");
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+MODULE_LICENSE("GPL");
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--- a/drivers/net/phy/Kconfig
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+++ b/drivers/net/phy/Kconfig
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@@ -60,6 +60,7 @@ config SFP
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depends on I2C && PHYLINK
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depends on HWMON || HWMON=n
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select MDIO_I2C
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+ select MDIO_SMBUS
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comment "Switch configuration API + drivers"
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--- a/include/linux/mdio/mdio-i2c.h
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+++ b/include/linux/mdio/mdio-i2c.h
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@@ -12,5 +12,8 @@ struct i2c_adapter;
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struct mii_bus;
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struct mii_bus *mdio_i2c_alloc(struct device *parent, struct i2c_adapter *i2c);
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+struct mii_bus *mdio_smbus_alloc(struct device *parent, struct i2c_adapter *i2c);
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+bool i2c_mii_valid_phy_id(int phy_id);
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+unsigned int i2c_mii_phy_addr(int phy_id);
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#endif
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--- a/drivers/net/mdio/mdio-i2c.c
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+++ b/drivers/net/mdio/mdio-i2c.c
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@@ -18,12 +18,12 @@
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* specified to be present in SFP modules. These correspond with PHY
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* addresses 16 and 17. Disallow access to these "phy" addresses.
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*/
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-static bool i2c_mii_valid_phy_id(int phy_id)
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+bool i2c_mii_valid_phy_id(int phy_id)
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{
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return phy_id != 0x10 && phy_id != 0x11;
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}
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-static unsigned int i2c_mii_phy_addr(int phy_id)
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+unsigned int i2c_mii_phy_addr(int phy_id)
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{
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return phy_id + 0x40;
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}
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