0a4b309f41
Backport initial LEDs hw control support. Currently this is limited to only rx/tx and link events for the netdev trigger but the API got accepted and the additional modes are working on and will be backported later. Refresh every patch and add the additional config flag for QCA8K new LEDs support. 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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@@ -61,6 +61,7 @@ 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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