ipq40xx: Add support for Unielec U4019

This commit adds support for the 32MB storage/512MB RAM version of the U4019
IPQ4019-based board from Unielec. The board has the following specifications:

* Qualcomm IPQ4019 (running at 717MHz)
* 512MB DDR3 RAM (optional 256MB/1GB)
* 32MB SPI NOR (optional 8/16MB or NAND)
* Five gigabit ports (Qualcomm QCA8075)
* 1x 2.4 GHz wifi (QCA4019 hw1.0)
* 1x 5 Ghz wifi (QCA4019 hw1.0)
* 1x mini-PCIe slot (only USB-pins connected)
* 1x SIM slot (mini-SIM)
* 1x USB2.0 port
* 1x button
* 1x controllable LED
* 1x micro SD-card reader

Working:
* Ethernet
* Wifi
* USB-port
* mini-PCIe slot + SIM slot
* Button
* Sysupgrade

Not working:
* SD card slot (no upstream support)

Installation instructions:

In order to install OpenWRT on the U4019, you need to go via the
initramfs-image. The installation steps are as follows:

* Connect to board via serial (header exposed and clearly marked).
* Interrupt bootloader by pressing a button.
* Copy the initramfs-image to your tftp folder, call the file C0A80079.img.
* Give the network interface connected to the U4019 the address
192.168.0.156/24.
* Start your tftp-server and run tftpboot on the board.
* Run bootm when the file has been transferred, to boot OpenWRT.
* Once OpenWRT has booted, copy the sysupgrade-image to the device and run
sysupgrade to install OpenWRT on the U4019.

Notes:

- Since IPQ4019 has been moved to 4.19, I have not added support for kernel
4.14.

- There is a bug with hardware encryption on IPQ4019, causing poor performance
with TCP and ipsec (see for example FS#2355). In order to improve performance,
I have disabled hardware encryption in the DTS. We can enable hw. enc. once/if
bug is fixed.

- In order for Ethernet to work, the phy has to be reset by setting gpio 47
low/high. Adding support for phy reset via gpio required patching the
mdio-driver, and the code added comes from the vendor driver. I do not know if
patching the driver is an acceptable approach or not.

v1->v2:
* Do not use wildcard as identifier in the board.d-scripts (thanks
Adrian Schmutzler).

Signed-off-by: Kristian Evensen <kristian.evensen@gmail.com>

1 files changed, 76 insertions, 4 deletions

diff --git a/target/linux/ipq40xx/patches-4.19/700-net-add-qualcomm-mdio.patch b/target/linux/ipq40xx/patches-4.19/700-net-add-qualcomm-mdio.patch
index e939597b8e..4be25186e6 100644
--- a/target/linux/ipq40xx/patches-4.19/700-net-add-qualcomm-mdio.patch
+++ b/target/linux/ipq40xx/patches-4.19/700-net-add-qualcomm-mdio.patch
@@ -1,6 +1,20 @@
+From 234d6f40fb4b771b396b45a9492aab463771bd0b Mon Sep 17 00:00:00 2001
+From: Kristian Evensen <kristian.evensen@gmail.com>
+Date: Tue, 6 Aug 2019 11:42:57 +0200
+Subject: [PATCH] phy: Add ipq40xx mdio driver
+
+---
+ drivers/net/phy/Kconfig        |   7 +
+ drivers/net/phy/Makefile       |   1 +
+ drivers/net/phy/mdio-ipq40xx.c | 247 +++++++++++++++++++++++++++++++++
+ 3 files changed, 255 insertions(+)
+ create mode 100644 drivers/net/phy/mdio-ipq40xx.c
+
+diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
+index 1f5fd24cd..eb71b47a3 100644
 --- a/drivers/net/phy/Kconfig
 +++ b/drivers/net/phy/Kconfig
-@@ -519,6 +519,13 @@ config XILINX_GMII2RGMII
+@@ -436,6 +436,13 @@ config XILINX_GMII2RGMII
  	  the Reduced Gigabit Media Independent Interface(RGMII) between
  	  Ethernet physical media devices and the Gigabit Ethernet controller.
  
@@ -14,9 +28,11 @@
  endif # PHYLIB
  
  config MICREL_KS8995MA
+diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
+index f21cda9d8..804c52634 100644
 --- a/drivers/net/phy/Makefile
 +++ b/drivers/net/phy/Makefile
-@@ -48,6 +48,7 @@ obj-$(CONFIG_MDIO_CAVIUM)	+= mdio-cavium
+@@ -33,6 +33,7 @@ obj-$(CONFIG_MDIO_CAVIUM)	+= mdio-cavium.o
  obj-$(CONFIG_MDIO_GPIO)		+= mdio-gpio.o
  obj-$(CONFIG_MDIO_HISI_FEMAC)	+= mdio-hisi-femac.o
  obj-$(CONFIG_MDIO_I2C)		+= mdio-i2c.o
@@ -24,9 +40,12 @@
  obj-$(CONFIG_MDIO_MOXART)	+= mdio-moxart.o
  obj-$(CONFIG_MDIO_MSCC_MIIM)	+= mdio-mscc-miim.o
  obj-$(CONFIG_MDIO_OCTEON)	+= mdio-octeon.o
+diff --git a/drivers/net/phy/mdio-ipq40xx.c b/drivers/net/phy/mdio-ipq40xx.c
+new file mode 100644
+index 000000000..88fe5dc2b
 --- /dev/null
 +++ b/drivers/net/phy/mdio-ipq40xx.c
-@@ -0,0 +1,196 @@
+@@ -0,0 +1,247 @@
 +/*
 + * Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
 + *
@@ -49,8 +68,10 @@
 +#include <linux/io.h>
 +#include <linux/of_address.h>
 +#include <linux/of_mdio.h>
++#include <linux/of_gpio.h>
 +#include <linux/phy.h>
 +#include <linux/platform_device.h>
++#include <linux/gpio.h>
 +
 +#define MDIO_CTRL_0_REG		0x40
 +#define MDIO_CTRL_1_REG		0x44
@@ -150,11 +171,60 @@
 +	return 0;
 +}
 +
++static int ipq40xx_phy_reset(struct platform_device *pdev)
++{
++	struct device_node *mdio_node;
++	int phy_reset_gpio_number;
++	int ret;
++
++	mdio_node = of_find_node_by_name(NULL, "mdio");
++	if (!mdio_node) {
++		dev_err(&pdev->dev, "Could not find mdio node\n");
++		return -ENOENT;
++	}
++
++	ret = of_get_named_gpio(mdio_node, "phy-reset-gpio", 0);
++	if (ret < 0) {
++		dev_err(&pdev->dev, "Could not find phy-reset-gpio\n");
++		return ret;
++	}
++
++	phy_reset_gpio_number = ret;
++
++	ret = gpio_request(phy_reset_gpio_number, "phy-reset-gpio");
++	if (ret) {
++		dev_err(&pdev->dev, "Can't get phy-reset-gpio %d\n", ret);
++		return ret;
++	}
++
++	ret = gpio_direction_output(phy_reset_gpio_number, 0x0);
++	if (ret) {
++		dev_err(&pdev->dev,
++			"Can't set direction for phy-reset-gpio %d\n", ret);
++		goto phy_reset_out;
++	}
++
++	usleep_range(1000, 10005);
++
++	gpio_set_value(phy_reset_gpio_number, 0x01);
++
++phy_reset_out:
++	gpio_free(phy_reset_gpio_number);
++
++	return ret;
++}
++
 +static int ipq40xx_mdio_probe(struct platform_device *pdev)
 +{
 +	struct ipq40xx_mdio_data *am;
 +	struct resource *res;
-+	int i;
++	int i, ret;
++
++	ret = ipq40xx_phy_reset(pdev);
++	if (ret) {
++		dev_err(&pdev->dev, "Could not find qca8075 reset gpio\n");
++		return -ENODEV;
++	}
 +
 +	am = devm_kzalloc(&pdev->dev, sizeof(*am), GFP_KERNEL);
 +	if (!am)
@@ -223,3 +293,5 @@
 +MODULE_AUTHOR("Qualcomm Atheros");
 +MODULE_VERSION(DRV_VERSION);
 +MODULE_LICENSE("Dual BSD/GPL");
+--
+2.20.1