OpenWrt – Rev 1
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/* 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@nbd.name>
* 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);
mt7530_mdio_w32(gsw, 0x700c, reg);
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);
}
}
mt7620_handle_carrier(priv);
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, 0x2305e30b, GSW_REG_MAC_P0_MCR);
mt7530_mdio_w32(gsw, 0x3600, 0x5e30b);
} else {
/* (GE1, Force 1000M/FD, FC ON, MAX_RX_LENGTH 1536) */
mtk_switch_w32(gsw, 0x2305e33b, GSW_REG_MAC_P0_MCR);
mt7530_mdio_w32(gsw, 0x3600, 0x5e33b);
}
/* (GE2, Link down) */
mtk_switch_w32(gsw, 0x8000, GSW_REG_MAC_P1_MCR);
/* Set switch max RX frame length to 2k */
mt7530_mdio_w32(gsw, GSW_REG_GMACCR, 0x3F0B);
/* 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 */
mt7530_mdio_w32(gsw, 0x7008, 0x1f);
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;
if (gsw->irq) {
request_irq(gsw->irq, gsw_interrupt_mt7621, 0,
"gsw", priv);
disable_irq(gsw->irq);
}
mt7621_hw_init(gsw, np);
if (gsw->irq)
enable_irq(gsw->irq);
return 0;
}
static int mt7621_gsw_probe(struct platform_device *pdev)
{
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
struct mt7620_gsw *gsw;
gsw = devm_kzalloc(&pdev->dev, sizeof(struct mt7620_gsw), GFP_KERNEL);
if (!gsw)
return -ENOMEM;
gsw->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(gsw->base))
return PTR_ERR(gsw->base);
gsw->dev = &pdev->dev;
gsw->irq = platform_get_irq(pdev, 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);