From 9fc19d5f7354709298dcb15b3a4c7cd9a18acebf Mon Sep 17 00:00:00 2001 From: John Crispin 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 --- 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 + * Copyright (C) 2009-2015 Felix Fietkau + * Copyright (C) 2013-2015 Michael Lee + */ + +#include +#include +#include +#include +#include +#include + +#include + +#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 "); +MODULE_DESCRIPTION("GBit switch driver for Mediatek MT7621 SoC"); +MODULE_VERSION(MTK_FE_DRV_VERSION);