--- /dev/null
+From 9fc19d5f7354709298dcb15b3a4c7cd9a18acebf Mon Sep 17 00:00:00 2001
+From: John Crispin <blogic@openwrt.org>
+Date: Mon, 14 Dec 2015 21:24:46 +0100
+Subject: [PATCH 504/513] net-next: mediatek: add switch driver for mt7621
+
+This driver is very basic and only provides basic init and irq support.
+Switchdev support for this device will follow.
+
+Signed-off-by: John Crispin <blogic@openwrt.org>
+---
+ drivers/net/ethernet/mediatek/gsw_mt7621.c | 284 ++++++++++++++++++++++++++++
+ 1 file changed, 284 insertions(+)
+ create mode 100644 drivers/net/ethernet/mediatek/gsw_mt7621.c
+
+--- /dev/null
++++ b/drivers/net/ethernet/mediatek/gsw_mt7621.c
+@@ -0,0 +1,284 @@
++/* This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation; version 2 of the License
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ * Copyright (C) 2009-2015 John Crispin <blogic@openwrt.org>
++ * Copyright (C) 2009-2015 Felix Fietkau <nbd@openwrt.org>
++ * Copyright (C) 2013-2015 Michael Lee <igvtee@gmail.com>
++ */
++
++#include <linux/module.h>
++#include <linux/kernel.h>
++#include <linux/types.h>
++#include <linux/platform_device.h>
++#include <linux/of_device.h>
++#include <linux/of_irq.h>
++
++#include <ralink_regs.h>
++
++#include "mtk_eth_soc.h"
++#include "gsw_mt7620.h"
++
++void mtk_switch_w32(struct mt7620_gsw *gsw, u32 val, unsigned reg)
++{
++ iowrite32(val, gsw->base + reg);
++}
++
++u32 mtk_switch_r32(struct mt7620_gsw *gsw, unsigned reg)
++{
++ return ioread32(gsw->base + reg);
++}
++
++static irqreturn_t gsw_interrupt_mt7621(int irq, void *_priv)
++{
++ struct fe_priv *priv = (struct fe_priv *)_priv;
++ struct mt7620_gsw *gsw = (struct mt7620_gsw *)priv->soc->swpriv;
++ u32 reg, i;
++
++ reg = mt7530_mdio_r32(gsw, 0x700c);
++
++ for (i = 0; i < 5; i++)
++ if (reg & BIT(i)) {
++ unsigned int link;
++
++ link = mt7530_mdio_r32(gsw,
++ 0x3008 + (i * 0x100)) & 0x1;
++
++ if (link != priv->link[i]) {
++ priv->link[i] = link;
++ if (link)
++ netdev_info(priv->netdev,
++ "port %d link up\n", i);
++ else
++ netdev_info(priv->netdev,
++ "port %d link down\n", i);
++ }
++ }
++
++ mt7530_mdio_w32(gsw, 0x700c, 0x1f);
++
++ return IRQ_HANDLED;
++}
++
++static void mt7621_hw_init(struct mt7620_gsw *gsw, struct device_node *np)
++{
++ u32 i;
++ u32 val;
++
++ /* wardware reset the switch */
++ fe_reset(RST_CTRL_MCM);
++ mdelay(10);
++
++ /* reduce RGMII2 PAD driving strength */
++ rt_sysc_m32(3 << 4, 0, SYSC_PAD_RGMII2_MDIO);
++
++ /* gpio mux - RGMII1=Normal mode */
++ rt_sysc_m32(BIT(14), 0, SYSC_GPIO_MODE);
++
++ /* set GMAC1 RGMII mode */
++ rt_sysc_m32(3 << 12, 0, SYSC_REG_CFG1);
++
++ /* enable MDIO to control MT7530 */
++ rt_sysc_m32(3 << 12, 0, SYSC_GPIO_MODE);
++
++ /* turn off all PHYs */
++ for (i = 0; i <= 4; i++) {
++ val = _mt7620_mii_read(gsw, i, 0x0);
++ val |= BIT(11);
++ _mt7620_mii_write(gsw, i, 0x0, val);
++ }
++
++ /* reset the switch */
++ mt7530_mdio_w32(gsw, 0x7000, 0x3);
++ usleep_range(10, 20);
++
++ if ((rt_sysc_r32(SYSC_REG_CHIP_REV_ID) & 0xFFFF) == 0x0101) {
++ /* (GE1, Force 1000M/FD, FC ON, MAX_RX_LENGTH 1536) */
++ mtk_switch_w32(gsw, 0x2105e30b, 0x100);
++ mt7530_mdio_w32(gsw, 0x3600, 0x5e30b);
++ } else {
++ /* (GE1, Force 1000M/FD, FC ON, MAX_RX_LENGTH 1536) */
++ mtk_switch_w32(gsw, 0x2105e33b, 0x100);
++ mt7530_mdio_w32(gsw, 0x3600, 0x5e33b);
++ }
++
++ /* (GE2, Link down) */
++ mtk_switch_w32(gsw, 0x8000, 0x200);
++
++ /* Enable Port 6, P5 as GMAC5, P5 disable */
++ val = mt7530_mdio_r32(gsw, 0x7804);
++ val &= ~BIT(8);
++ val |= BIT(6) | BIT(13) | BIT(16);
++ mt7530_mdio_w32(gsw, 0x7804, val);
++
++ val = rt_sysc_r32(0x10);
++ val = (val >> 6) & 0x7;
++ if (val >= 6) {
++ /* 25Mhz Xtal - do nothing */
++ } else if (val >= 3) {
++ /* 40Mhz */
++
++ /* disable MT7530 core clock */
++ _mt7620_mii_write(gsw, 0, 13, 0x1f);
++ _mt7620_mii_write(gsw, 0, 14, 0x410);
++ _mt7620_mii_write(gsw, 0, 13, 0x401f);
++ _mt7620_mii_write(gsw, 0, 14, 0x0);
++
++ /* disable MT7530 PLL */
++ _mt7620_mii_write(gsw, 0, 13, 0x1f);
++ _mt7620_mii_write(gsw, 0, 14, 0x40d);
++ _mt7620_mii_write(gsw, 0, 13, 0x401f);
++ _mt7620_mii_write(gsw, 0, 14, 0x2020);
++
++ /* for MT7530 core clock = 500Mhz */
++ _mt7620_mii_write(gsw, 0, 13, 0x1f);
++ _mt7620_mii_write(gsw, 0, 14, 0x40e);
++ _mt7620_mii_write(gsw, 0, 13, 0x401f);
++ _mt7620_mii_write(gsw, 0, 14, 0x119);
++
++ /* enable MT7530 PLL */
++ _mt7620_mii_write(gsw, 0, 13, 0x1f);
++ _mt7620_mii_write(gsw, 0, 14, 0x40d);
++ _mt7620_mii_write(gsw, 0, 13, 0x401f);
++ _mt7620_mii_write(gsw, 0, 14, 0x2820);
++
++ usleep_range(20, 40);
++
++ /* enable MT7530 core clock */
++ _mt7620_mii_write(gsw, 0, 13, 0x1f);
++ _mt7620_mii_write(gsw, 0, 14, 0x410);
++ _mt7620_mii_write(gsw, 0, 13, 0x401f);
++ } else {
++ /* 20Mhz Xtal - TODO */
++ }
++
++ /* RGMII */
++ _mt7620_mii_write(gsw, 0, 14, 0x1);
++
++ /* set MT7530 central align */
++ val = mt7530_mdio_r32(gsw, 0x7830);
++ val &= ~BIT(0);
++ val |= BIT(1);
++ mt7530_mdio_w32(gsw, 0x7830, val);
++ val = mt7530_mdio_r32(gsw, 0x7a40);
++ val &= ~BIT(30);
++ mt7530_mdio_w32(gsw, 0x7a40, val);
++ mt7530_mdio_w32(gsw, 0x7a78, 0x855);
++
++ /* delay setting for 10/1000M */
++ mt7530_mdio_w32(gsw, 0x7b00, 0x102);
++ mt7530_mdio_w32(gsw, 0x7b04, 0x14);
++
++ /* lower Tx Driving*/
++ mt7530_mdio_w32(gsw, 0x7a54, 0x44);
++ mt7530_mdio_w32(gsw, 0x7a5c, 0x44);
++ mt7530_mdio_w32(gsw, 0x7a64, 0x44);
++ mt7530_mdio_w32(gsw, 0x7a6c, 0x44);
++ mt7530_mdio_w32(gsw, 0x7a74, 0x44);
++ mt7530_mdio_w32(gsw, 0x7a7c, 0x44);
++
++ /* turn on all PHYs */
++ for (i = 0; i <= 4; i++) {
++ val = _mt7620_mii_read(gsw, i, 0);
++ val &= ~BIT(11);
++ _mt7620_mii_write(gsw, i, 0, val);
++ }
++
++ /* enable irq */
++ val = mt7530_mdio_r32(gsw, 0x7808);
++ val |= 3 << 16;
++ mt7530_mdio_w32(gsw, 0x7808, val);
++}
++
++static const struct of_device_id mediatek_gsw_match[] = {
++ { .compatible = "mediatek,mt7621-gsw" },
++ {},
++};
++MODULE_DEVICE_TABLE(of, mediatek_gsw_match);
++
++int mtk_gsw_init(struct fe_priv *priv)
++{
++ struct device_node *np = priv->switch_np;
++ struct platform_device *pdev = of_find_device_by_node(np);
++ struct mt7620_gsw *gsw;
++
++ if (!pdev)
++ return -ENODEV;
++
++ if (!of_device_is_compatible(np, mediatek_gsw_match->compatible))
++ return -EINVAL;
++
++ gsw = platform_get_drvdata(pdev);
++ priv->soc->swpriv = gsw;
++
++ mt7621_hw_init(gsw, np);
++
++ if (gsw->irq) {
++ request_irq(gsw->irq, gsw_interrupt_mt7621, 0,
++ "gsw", priv);
++ mt7530_mdio_w32(gsw, 0x7008, 0x1f);
++ }
++
++ return 0;
++}
++
++static int mt7621_gsw_probe(struct platform_device *pdev)
++{
++ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++ const char *port4 = NULL;
++ struct mt7620_gsw *gsw;
++ struct device_node *np;
++
++ gsw = devm_kzalloc(&pdev->dev, sizeof(struct mt7620_gsw), GFP_KERNEL);
++ if (!gsw)
++ return -ENOMEM;
++
++ gsw->base = devm_ioremap_resource(&pdev->dev, res);
++ if (!gsw->base)
++ return -EADDRNOTAVAIL;
++
++ gsw->dev = &pdev->dev;
++
++ of_property_read_string(np, "mediatek,port4", &port4);
++ if (port4 && !strcmp(port4, "ephy"))
++ gsw->port4 = PORT4_EPHY;
++ else if (port4 && !strcmp(port4, "gmac"))
++ gsw->port4 = PORT4_EXT;
++ else
++ gsw->port4 = PORT4_EPHY;
++
++ gsw->irq = irq_of_parse_and_map(np, 0);
++
++ platform_set_drvdata(pdev, gsw);
++
++ return 0;
++}
++
++static int mt7621_gsw_remove(struct platform_device *pdev)
++{
++ platform_set_drvdata(pdev, NULL);
++
++ return 0;
++}
++
++static struct platform_driver gsw_driver = {
++ .probe = mt7621_gsw_probe,
++ .remove = mt7621_gsw_remove,
++ .driver = {
++ .name = "mt7621-gsw",
++ .owner = THIS_MODULE,
++ .of_match_table = mediatek_gsw_match,
++ },
++};
++
++module_platform_driver(gsw_driver);
++
++MODULE_LICENSE("GPL");
++MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
++MODULE_DESCRIPTION("GBit switch driver for Mediatek MT7621 SoC");
++MODULE_VERSION(MTK_FE_DRV_VERSION);
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