ipq806x: add ipq806x mdio driver

This was created by Chunkeey some time ago. Since mdio driver
works or doesn't work and since this was tested by me for 1 year,
include it to remove the use of the generic bitbang gpio driver for
switch driver.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>

1 files changed, 206 insertions, 0 deletions

diff --git a/target/linux/ipq806x/patches-5.4/700-net-mdio-add-ipq8064-mdio-driver.patch b/target/linux/ipq806x/patches-5.4/700-net-mdio-add-ipq8064-mdio-driver.patch
new file mode 100644
index 0000000000..8ed3e035fd
--- /dev/null
+++ b/target/linux/ipq806x/patches-5.4/700-net-mdio-add-ipq8064-mdio-driver.patch
@@ -0,0 +1,206 @@
+From 5de1da6c862de6a92ac9aed521f21fd5a180f22b Mon Sep 17 00:00:00 2001
+From: Christian Lamparter <chunkeey@gmail.com>
+Date: Sat, 2 Feb 2019 02:48:35 +0100
+Subject: [PATCH] net: mdio: add ipq8064 mdio driver
+
+Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
+---
+ drivers/net/phy/Kconfig        |   8 ++
+ drivers/net/phy/Makefile       |   1 +
+ drivers/net/phy/mdio-ipq8064.c | 163 +++++++++++++++++++++++++++++++++
+ 3 files changed, 172 insertions(+)
+ create mode 100644 drivers/net/phy/mdio-ipq8064.c
+
+--- a/drivers/net/phy/Kconfig
++++ b/drivers/net/phy/Kconfig
+@@ -156,6 +156,14 @@ config MDIO_I2C
+ 
+ 	  This is library mode.
+ 
++config MDIO_IPQ8064
++	tristate "Qualcomm IPQ8064 MDIO interface support"
++	depends on HAS_IOMEM && OF_MDIO
++	depends on MFD_SYSCON
++	help
++	  This driver supports the MDIO interface found in the network
++	  interface units of the IPQ8064 SoC
++
+ config MDIO_MOXART
+ 	tristate "MOXA ART MDIO interface support"
+ 	depends on ARCH_MOXART || COMPILE_TEST
+--- a/drivers/net/phy/Makefile
++++ b/drivers/net/phy/Makefile
+@@ -51,6 +51,7 @@ obj-$(CONFIG_MDIO_CAVIUM)	+= mdio-cavium
+ obj-$(CONFIG_MDIO_GPIO)		+= mdio-gpio.o
+ obj-$(CONFIG_MDIO_HISI_FEMAC)	+= mdio-hisi-femac.o
+ obj-$(CONFIG_MDIO_I2C)		+= mdio-i2c.o
++obj-$(CONFIG_MDIO_IPQ8064)	+= mdio-ipq8064.o
+ obj-$(CONFIG_MDIO_MOXART)	+= mdio-moxart.o
+ obj-$(CONFIG_MDIO_MSCC_MIIM)	+= mdio-mscc-miim.o
+ obj-$(CONFIG_MDIO_OCTEON)	+= mdio-octeon.o
+--- /dev/null
++++ b/drivers/net/phy/mdio-ipq8064.c
+@@ -0,0 +1,163 @@
++// SPDX-License-Identifier: GPL-2.0
++//
++// Qualcomm IPQ8064 MDIO interface driver
++//
++// Copyright (C) 2019 Christian Lamparter <chunkeey@gmail.com>
++
++#include <linux/delay.h>
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/regmap.h>
++#include <linux/of_mdio.h>
++#include <linux/phy.h>
++#include <linux/platform_device.h>
++#include <linux/mfd/syscon.h>
++
++/* MII address register definitions */
++#define MII_ADDR_REG_ADDR                       0x10
++#define MII_BUSY                                BIT(0)
++#define MII_WRITE                               BIT(1)
++#define MII_CLKRANGE_60_100M                    (0 << 2)
++#define MII_CLKRANGE_100_150M                   (1 << 2)
++#define MII_CLKRANGE_20_35M                     (2 << 2)
++#define MII_CLKRANGE_35_60M                     (3 << 2)
++#define MII_CLKRANGE_150_250M                   (4 << 2)
++#define MII_CLKRANGE_250_300M                   (5 << 2)
++#define MII_CLKRANGE_MASK			GENMASK(4, 2)
++#define MII_REG_SHIFT				6
++#define MII_REG_MASK				GENMASK(10, 6)
++#define MII_ADDR_SHIFT				11
++#define MII_ADDR_MASK				GENMASK(15, 11)
++
++#define MII_DATA_REG_ADDR                       0x14
++
++#define MII_MDIO_DELAY                          (1000)
++#define MII_MDIO_RETRY                          (10)
++
++struct ipq8064_mdio {
++	struct regmap *base; /* NSS_GMAC0_BASE */
++};
++
++static int
++ipq8064_mdio_wait_busy(struct ipq8064_mdio *priv)
++{
++	int i;
++
++	for (i = 0; i < MII_MDIO_RETRY; i++) {
++		unsigned int busy;
++
++		regmap_read(priv->base, MII_ADDR_REG_ADDR, &busy);
++		if (!(busy & MII_BUSY))
++			return 0;
++
++		udelay(MII_MDIO_DELAY);
++	}
++
++	return -ETIMEDOUT;
++}
++
++static int
++ipq8064_mdio_read(struct mii_bus *bus, int phy_addr, int reg_offset)
++{
++	struct ipq8064_mdio *priv = bus->priv;
++	u32 miiaddr = MII_BUSY | MII_CLKRANGE_250_300M;
++	u32 ret_val;
++	int err;
++
++	miiaddr |= ((phy_addr << MII_ADDR_SHIFT) & MII_ADDR_MASK) |
++		   ((reg_offset << MII_REG_SHIFT) & MII_REG_MASK);
++
++	regmap_write(priv->base, MII_ADDR_REG_ADDR, miiaddr);
++	udelay(10);
++
++	err = ipq8064_mdio_wait_busy(priv);
++	if (err)
++		return err;
++
++	regmap_read(priv->base, MII_DATA_REG_ADDR, &ret_val);
++	return (int)ret_val;
++}
++
++static int
++ipq8064_mdio_write(struct mii_bus *bus, int phy_addr, int reg_offset, u16 data)
++{
++	struct ipq8064_mdio *priv = bus->priv;
++	u32 miiaddr = MII_WRITE | MII_BUSY | MII_CLKRANGE_250_300M;
++
++	regmap_write(priv->base, MII_DATA_REG_ADDR, data);
++
++	miiaddr |= ((phy_addr << MII_ADDR_SHIFT) & MII_ADDR_MASK) |
++		   ((reg_offset << MII_REG_SHIFT) & MII_REG_MASK);
++
++	regmap_write(priv->base, MII_ADDR_REG_ADDR, miiaddr);
++	udelay(10);
++
++	return ipq8064_mdio_wait_busy(priv);
++}
++
++static int
++ipq8064_mdio_probe(struct platform_device *pdev)
++{
++	struct device_node *np = pdev->dev.of_node;
++	struct ipq8064_mdio *priv;
++	struct mii_bus *bus;
++	int ret;
++
++	bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*priv));
++	if (!bus)
++		return -ENOMEM;
++
++	bus->name = "ipq8064_mdio_bus";
++	bus->read = ipq8064_mdio_read;
++	bus->write = ipq8064_mdio_write;
++	snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev));
++	bus->parent = &pdev->dev;
++
++	priv = bus->priv;
++	priv->base = syscon_node_to_regmap(np);
++	if (IS_ERR_OR_NULL(priv->base)) {
++		priv->base = syscon_regmap_lookup_by_phandle(np, "master");
++		if (IS_ERR_OR_NULL(priv->base)) {
++			pr_err("master phandle not found\n");
++			return -EINVAL;
++		}
++	}
++
++	ret = of_mdiobus_register(bus, np);
++	if (ret)
++		return ret;
++
++	platform_set_drvdata(pdev, bus);
++	return 0;
++}
++
++static int
++ipq8064_mdio_remove(struct platform_device *pdev)
++{
++	struct mii_bus *bus = platform_get_drvdata(pdev);
++
++	mdiobus_unregister(bus);
++
++	return 0;
++}
++
++static const struct of_device_id ipq8064_mdio_dt_ids[] = {
++	{ .compatible = "qcom,ipq8064-mdio" },
++	{ }
++};
++MODULE_DEVICE_TABLE(of, ipq8064_mdio_dt_ids);
++
++static struct platform_driver ipq8064_mdio_driver = {
++	.probe = ipq8064_mdio_probe,
++	.remove = ipq8064_mdio_remove,
++	.driver = {
++		.name = "ipq8064-mdio",
++		.of_match_table = ipq8064_mdio_dt_ids,
++	},
++};
++
++module_platform_driver(ipq8064_mdio_driver);
++
++MODULE_DESCRIPTION("Qualcomm IPQ8064 MDIO interface driver");
++MODULE_AUTHOR("Christian Lamparter <chunkeey@gmail.com>");
++MODULE_LICENSE("GPL");