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net: dsa: LAN9303: add MDIO managed mode support
When the LAN9303 device is in MDIO manged mode, all register accesses must be done via MDIO. Please note: this code is compile time tested only due to the absence of such configured hardware. It is based on a patch from Stefan Roese from 2014. Signed-off-by: Juergen Borleis <[email protected]> CC: [email protected] CC: [email protected] CC: [email protected] CC: [email protected] Acked-by: Rob Herring <[email protected]> Signed-off-by: David S. Miller <[email protected]>
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‎Documentation/devicetree/bindings/net/dsa/lan9303.txt

+44-1
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,10 @@ SMSC/MicroChip LAN9303 three port ethernet switch
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Required properties:
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6-
- compatible: should be "smsc,lan9303-i2c"
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- compatible: should be
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- "smsc,lan9303-i2c" for I2C managed mode
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or
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- "smsc,lan9303-mdio" for mdio managed mode
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Optional properties:
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@@ -60,3 +63,43 @@ I2C managed mode:
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};
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};
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};
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MDIO managed mode:
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master: masterdevice@X {
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status = "okay";
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phy-handle = <&switch>;
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mdio {
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#address-cells = <1>;
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#size-cells = <0>;
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switch: switch-phy@0 {
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compatible = "smsc,lan9303-mdio";
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reg = <0>;
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reset-gpios = <&gpio7 6 GPIO_ACTIVE_LOW>;
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reset-duration = <100>;
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ports {
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#address-cells = <1>;
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#size-cells = <0>;
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port@0 {
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reg = <0>;
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label = "cpu";
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ethernet = <&master>;
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};
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port@1 { /* external port 1 */
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reg = <1>;
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label = "lan1;
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};
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port@2 { /* external port 2 */
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reg = <2>;
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label = "lan2";
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};
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};
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};
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};
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};

‎drivers/net/dsa/Kconfig

+8
Original file line numberDiff line numberDiff line change
@@ -66,4 +66,12 @@ config NET_DSA_SMSC_LAN9303_I2C
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Enable access functions if the SMSC/Microchip LAN9303 is configured
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for I2C managed mode.
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config NET_DSA_SMSC_LAN9303_MDIO
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tristate "SMSC/Microchip LAN9303 3-ports 10/100 ethernet switch in MDIO managed mode"
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depends on NET_DSA
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select NET_DSA_SMSC_LAN9303
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---help---
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Enable access functions if the SMSC/Microchip LAN9303 is configured
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for MDIO managed mode.
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endmenu

‎drivers/net/dsa/Makefile

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@@ -5,6 +5,7 @@ obj-$(CONFIG_NET_DSA_QCA8K) += qca8k.o
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obj-$(CONFIG_NET_DSA_MT7530) += mt7530.o
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obj-$(CONFIG_NET_DSA_SMSC_LAN9303) += lan9303-core.o
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obj-$(CONFIG_NET_DSA_SMSC_LAN9303_I2C) += lan9303_i2c.o
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obj-$(CONFIG_NET_DSA_SMSC_LAN9303_MDIO) += lan9303_mdio.o
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obj-y += b53/
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obj-y += mv88e6xxx/
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obj-$(CONFIG_NET_DSA_LOOP) += dsa_loop.o dsa_loop_bdinfo.o

‎drivers/net/dsa/lan9303_mdio.c

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,148 @@
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/*
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* Copyright (C) 2017 Pengutronix, Juergen Borleis <[email protected]>
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*
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* Partially based on a patch from
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* Copyright (c) 2014 Stefan Roese <[email protected]>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mdio.h>
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#include <linux/phy.h>
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#include <linux/of.h>
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#include "lan9303.h"
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/* Generate phy-addr and -reg from the input address */
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#define PHY_ADDR(x) ((((x) >> 6) + 0x10) & 0x1f)
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#define PHY_REG(x) (((x) >> 1) & 0x1f)
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struct lan9303_mdio {
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struct mdio_device *device;
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struct lan9303 chip;
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};
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static void lan9303_mdio_real_write(struct mdio_device *mdio, int reg, u16 val)
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{
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mdio->bus->write(mdio->bus, PHY_ADDR(reg), PHY_REG(reg), val);
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}
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static int lan9303_mdio_write(void *ctx, uint32_t reg, uint32_t val)
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{
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struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx;
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mutex_lock(&sw_dev->device->bus->mdio_lock);
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lan9303_mdio_real_write(sw_dev->device, reg, val & 0xffff);
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lan9303_mdio_real_write(sw_dev->device, reg + 2, (val >> 16) & 0xffff);
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mutex_unlock(&sw_dev->device->bus->mdio_lock);
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return 0;
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}
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static u16 lan9303_mdio_real_read(struct mdio_device *mdio, int reg)
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{
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return mdio->bus->read(mdio->bus, PHY_ADDR(reg), PHY_REG(reg));
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}
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static int lan9303_mdio_read(void *ctx, uint32_t reg, uint32_t *val)
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{
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struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx;
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mutex_lock(&sw_dev->device->bus->mdio_lock);
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*val = lan9303_mdio_real_read(sw_dev->device, reg);
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*val |= (lan9303_mdio_real_read(sw_dev->device, reg + 2) << 16);
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mutex_unlock(&sw_dev->device->bus->mdio_lock);
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return 0;
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}
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static const struct regmap_config lan9303_mdio_regmap_config = {
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.reg_bits = 8,
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.val_bits = 32,
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.reg_stride = 1,
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.can_multi_write = true,
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.max_register = 0x0ff, /* address bits 0..1 are not used */
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.reg_format_endian = REGMAP_ENDIAN_LITTLE,
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.volatile_table = &lan9303_register_set,
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.wr_table = &lan9303_register_set,
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.rd_table = &lan9303_register_set,
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.reg_read = lan9303_mdio_read,
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.reg_write = lan9303_mdio_write,
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.cache_type = REGCACHE_NONE,
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};
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static int lan9303_mdio_probe(struct mdio_device *mdiodev)
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{
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struct lan9303_mdio *sw_dev;
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int ret;
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sw_dev = devm_kzalloc(&mdiodev->dev, sizeof(struct lan9303_mdio),
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GFP_KERNEL);
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if (!sw_dev)
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return -ENOMEM;
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sw_dev->chip.regmap = devm_regmap_init(&mdiodev->dev, NULL, sw_dev,
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&lan9303_mdio_regmap_config);
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if (IS_ERR(sw_dev->chip.regmap)) {
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ret = PTR_ERR(sw_dev->chip.regmap);
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dev_err(&mdiodev->dev, "regmap init failed: %d\n", ret);
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return ret;
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}
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/* link forward and backward */
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sw_dev->device = mdiodev;
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dev_set_drvdata(&mdiodev->dev, sw_dev);
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sw_dev->chip.dev = &mdiodev->dev;
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ret = lan9303_probe(&sw_dev->chip, mdiodev->dev.of_node);
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if (ret != 0)
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return ret;
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dev_info(&mdiodev->dev, "LAN9303 MDIO driver loaded successfully\n");
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return 0;
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}
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static void lan9303_mdio_remove(struct mdio_device *mdiodev)
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{
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struct lan9303_mdio *sw_dev = dev_get_drvdata(&mdiodev->dev);
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if (!sw_dev)
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return;
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lan9303_remove(&sw_dev->chip);
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}
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/*-------------------------------------------------------------------------*/
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static const struct of_device_id lan9303_mdio_of_match[] = {
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{ .compatible = "smsc,lan9303-mdio" },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, lan9303_mdio_of_match);
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static struct mdio_driver lan9303_mdio_driver = {
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.mdiodrv.driver = {
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.name = "LAN9303_MDIO",
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.of_match_table = of_match_ptr(lan9303_mdio_of_match),
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},
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.probe = lan9303_mdio_probe,
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.remove = lan9303_mdio_remove,
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};
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mdio_module_driver(lan9303_mdio_driver);
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MODULE_AUTHOR("Stefan Roese <[email protected]>, Juergen Borleis <[email protected]>");
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MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in MDIO managed mode");
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MODULE_LICENSE("GPL v2");

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