target/linux/ramips/files-4.14/drivers/net/ethernet/mtk/gsw_mt7621.c

   1 /*   This program is free software; you can redistribute it and/or modify
   2  *   it under the terms of the GNU General Public License as published by
   3  *   the Free Software Foundation; version 2 of the License
   4  *
   5  *   This program is distributed in the hope that it will be useful,
   6  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   7  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   8  *   GNU General Public License for more details.
   9  *
  10  *   Copyright (C) 2009-2015 John Crispin <blogic@openwrt.org>
  11  *   Copyright (C) 2009-2015 Felix Fietkau <nbd@nbd.name>
  12  *   Copyright (C) 2013-2015 Michael Lee <igvtee@gmail.com>
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/types.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/of_device.h>
  20 #include <linux/of_irq.h>
  21
  22 #include <ralink_regs.h>
  23
  24 #include "mtk_eth_soc.h"
  25 #include "gsw_mt7620.h"
  26
  27 void mtk_switch_w32(struct mt7620_gsw *gsw, u32 val, unsigned reg)
  28 {
  29         iowrite32(val, gsw->base + reg);
  30 }
  31
  32 u32 mtk_switch_r32(struct mt7620_gsw *gsw, unsigned reg)
  33 {
  34         return ioread32(gsw->base + reg);
  35 }
  36
  37 static irqreturn_t gsw_interrupt_mt7621(int irq, void *_priv)
  38 {
  39         struct fe_priv *priv = (struct fe_priv *)_priv;
  40         struct mt7620_gsw *gsw = (struct mt7620_gsw *)priv->soc->swpriv;
  41         u32 reg, i;
  42
  43         reg = mt7530_mdio_r32(gsw, 0x700c);
  44         mt7530_mdio_w32(gsw, 0x700c, reg);
  45
  46         for (i = 0; i < 5; i++)
  47                 if (reg & BIT(i)) {
  48                         unsigned int link;
  49
  50                         link = mt7530_mdio_r32(gsw,
  51                                                0x3008 + (i * 0x100)) & 0x1;
  52
  53                         if (link != priv->link[i]) {
  54                                 priv->link[i] = link;
  55                                 if (link)
  56                                         netdev_info(priv->netdev,
  57                                                     "port %d link up\n", i);
  58                                 else
  59                                         netdev_info(priv->netdev,
  60                                                     "port %d link down\n", i);
  61                         }
  62                 }
  63
  64         mt7620_handle_carrier(priv);
  65
  66         return IRQ_HANDLED;
  67 }
  68
  69 static void mt7621_hw_init(struct mt7620_gsw *gsw, struct device_node *np)
  70 {
  71         u32 i;
  72         u32 val;
  73
  74         /* wardware reset the switch */
  75         fe_reset(RST_CTRL_MCM);
  76         mdelay(10);
  77
  78         /* reduce RGMII2 PAD driving strength */
  79         rt_sysc_m32(3 << 4, 0, SYSC_PAD_RGMII2_MDIO);
  80
  81         /* gpio mux - RGMII1=Normal mode */
  82         rt_sysc_m32(BIT(14), 0, SYSC_GPIO_MODE);
  83
  84         /* set GMAC1 RGMII mode */
  85         rt_sysc_m32(3 << 12, 0, SYSC_REG_CFG1);
  86
  87         /* enable MDIO to control MT7530 */
  88         rt_sysc_m32(3 << 12, 0, SYSC_GPIO_MODE);
  89
  90         /* turn off all PHYs */
  91         for (i = 0; i <= 4; i++) {
  92                 val = _mt7620_mii_read(gsw, i, 0x0);
  93                 val |= BIT(11);
  94                 _mt7620_mii_write(gsw, i, 0x0, val);
  95         }
  96
  97         /* reset the switch */
  98         mt7530_mdio_w32(gsw, 0x7000, 0x3);
  99         usleep_range(10, 20);
 100
 101         if ((rt_sysc_r32(SYSC_REG_CHIP_REV_ID) & 0xFFFF) == 0x0101) {
 102                 /* (GE1, Force 1000M/FD, FC ON, MAX_RX_LENGTH 1536) */
 103                 mtk_switch_w32(gsw, 0x2305e30b, GSW_REG_MAC_P0_MCR);
 104                 mt7530_mdio_w32(gsw, 0x3600, 0x5e30b);
 105         } else {
 106                 /* (GE1, Force 1000M/FD, FC ON, MAX_RX_LENGTH 1536) */
 107                 mtk_switch_w32(gsw, 0x2305e33b, GSW_REG_MAC_P0_MCR);
 108                 mt7530_mdio_w32(gsw, 0x3600, 0x5e33b);
 109         }
 110
 111         /* (GE2, Link down) */
 112         mtk_switch_w32(gsw, 0x8000, GSW_REG_MAC_P1_MCR);
 113
 114         /* Set switch max RX frame length to 2k */
 115         mt7530_mdio_w32(gsw, GSW_REG_GMACCR, 0x3F0B);
 116
 117         /* Enable Port 6, P5 as GMAC5, P5 disable */
 118         val = mt7530_mdio_r32(gsw, 0x7804);
 119         val &= ~BIT(8);
 120         val |= BIT(6) | BIT(13) | BIT(16);
 121         mt7530_mdio_w32(gsw, 0x7804, val);
 122
 123         val = rt_sysc_r32(0x10);
 124         val = (val >> 6) & 0x7;
 125         if (val >= 6) {
 126                 /* 25Mhz Xtal - do nothing */
 127         } else if (val >= 3) {
 128                 /* 40Mhz */
 129
 130                 /* disable MT7530 core clock */
 131                 _mt7620_mii_write(gsw, 0, 13, 0x1f);
 132                 _mt7620_mii_write(gsw, 0, 14, 0x410);
 133                 _mt7620_mii_write(gsw, 0, 13, 0x401f);
 134                 _mt7620_mii_write(gsw, 0, 14, 0x0);
 135
 136                 /* disable MT7530 PLL */
 137                 _mt7620_mii_write(gsw, 0, 13, 0x1f);
 138                 _mt7620_mii_write(gsw, 0, 14, 0x40d);
 139                 _mt7620_mii_write(gsw, 0, 13, 0x401f);
 140                 _mt7620_mii_write(gsw, 0, 14, 0x2020);
 141
 142                 /* for MT7530 core clock = 500Mhz */
 143                 _mt7620_mii_write(gsw, 0, 13, 0x1f);
 144                 _mt7620_mii_write(gsw, 0, 14, 0x40e);
 145                 _mt7620_mii_write(gsw, 0, 13, 0x401f);
 146                 _mt7620_mii_write(gsw, 0, 14, 0x119);
 147
 148                 /* enable MT7530 PLL */
 149                 _mt7620_mii_write(gsw, 0, 13, 0x1f);
 150                 _mt7620_mii_write(gsw, 0, 14, 0x40d);
 151                 _mt7620_mii_write(gsw, 0, 13, 0x401f);
 152                 _mt7620_mii_write(gsw, 0, 14, 0x2820);
 153
 154                 usleep_range(20, 40);
 155
 156                 /* enable MT7530 core clock */
 157                 _mt7620_mii_write(gsw, 0, 13, 0x1f);
 158                 _mt7620_mii_write(gsw, 0, 14, 0x410);
 159                 _mt7620_mii_write(gsw, 0, 13, 0x401f);
 160         } else {
 161                 /* 20Mhz Xtal - TODO */
 162         }
 163
 164         /* RGMII */
 165         _mt7620_mii_write(gsw, 0, 14, 0x1);
 166
 167         /* set MT7530 central align */
 168         val = mt7530_mdio_r32(gsw, 0x7830);
 169         val &= ~BIT(0);
 170         val |= BIT(1);
 171         mt7530_mdio_w32(gsw, 0x7830, val);
 172         val = mt7530_mdio_r32(gsw, 0x7a40);
 173         val &= ~BIT(30);
 174         mt7530_mdio_w32(gsw, 0x7a40, val);
 175         mt7530_mdio_w32(gsw, 0x7a78, 0x855);
 176
 177         /* delay setting for 10/1000M */
 178         mt7530_mdio_w32(gsw, 0x7b00, 0x102);
 179         mt7530_mdio_w32(gsw, 0x7b04, 0x14);
 180
 181         /* lower Tx Driving*/
 182         mt7530_mdio_w32(gsw, 0x7a54, 0x44);
 183         mt7530_mdio_w32(gsw, 0x7a5c, 0x44);
 184         mt7530_mdio_w32(gsw, 0x7a64, 0x44);
 185         mt7530_mdio_w32(gsw, 0x7a6c, 0x44);
 186         mt7530_mdio_w32(gsw, 0x7a74, 0x44);
 187         mt7530_mdio_w32(gsw, 0x7a7c, 0x44);
 188
 189         /* turn on all PHYs */
 190         for (i = 0; i <= 4; i++) {
 191                 val = _mt7620_mii_read(gsw, i, 0);
 192                 val &= ~BIT(11);
 193                 _mt7620_mii_write(gsw, i, 0, val);
 194         }
 195
 196         /* enable irq */
 197         mt7530_mdio_w32(gsw, 0x7008, 0x1f);
 198         val = mt7530_mdio_r32(gsw, 0x7808);
 199         val |= 3 << 16;
 200         mt7530_mdio_w32(gsw, 0x7808, val);
 201 }
 202
 203 static const struct of_device_id mediatek_gsw_match[] = {
 204         { .compatible = "mediatek,mt7621-gsw" },
 205         {},
 206 };
 207 MODULE_DEVICE_TABLE(of, mediatek_gsw_match);
 208
 209 int mtk_gsw_init(struct fe_priv *priv)
 210 {
 211         struct device_node *np = priv->switch_np;
 212         struct platform_device *pdev = of_find_device_by_node(np);
 213         struct mt7620_gsw *gsw;
 214
 215         if (!pdev)
 216                 return -ENODEV;
 217
 218         if (!of_device_is_compatible(np, mediatek_gsw_match->compatible))
 219                 return -EINVAL;
 220
 221         gsw = platform_get_drvdata(pdev);
 222         priv->soc->swpriv = gsw;
 223
 224         if (gsw->irq) {
 225                 request_irq(gsw->irq, gsw_interrupt_mt7621, 0,
 226                             "gsw", priv);
 227                 disable_irq(gsw->irq);
 228         }
 229
 230         mt7621_hw_init(gsw, np);
 231
 232         if (gsw->irq)
 233                 enable_irq(gsw->irq);
 234
 235         return 0;
 236 }
 237
 238 static int mt7621_gsw_probe(struct platform_device *pdev)
 239 {
 240         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 241         const char *port4 = NULL;
 242         struct mt7620_gsw *gsw;
 243         struct device_node *np;
 244
 245         gsw = devm_kzalloc(&pdev->dev, sizeof(struct mt7620_gsw), GFP_KERNEL);
 246         if (!gsw)
 247                 return -ENOMEM;
 248
 249         gsw->base = devm_ioremap_resource(&pdev->dev, res);
 250         if (!gsw->base)
 251                 return -EADDRNOTAVAIL;
 252
 253         gsw->dev = &pdev->dev;
 254
 255         of_property_read_string(np, "mediatek,port4", &port4);
 256         if (port4 && !strcmp(port4, "ephy"))
 257                 gsw->port4 = PORT4_EPHY;
 258         else if (port4 && !strcmp(port4, "gmac"))
 259                 gsw->port4 = PORT4_EXT;
 260         else
 261                 gsw->port4 = PORT4_EPHY;
 262
 263         gsw->irq = platform_get_irq(pdev, 0);
 264
 265         platform_set_drvdata(pdev, gsw);
 266
 267         return 0;
 268 }
 269
 270 static int mt7621_gsw_remove(struct platform_device *pdev)
 271 {
 272         platform_set_drvdata(pdev, NULL);
 273
 274         return 0;
 275 }
 276
 277 static struct platform_driver gsw_driver = {
 278         .probe = mt7621_gsw_probe,
 279         .remove = mt7621_gsw_remove,
 280         .driver = {
 281                 .name = "mt7621-gsw",
 282                 .owner = THIS_MODULE,
 283                 .of_match_table = mediatek_gsw_match,
 284         },
 285 };
 286
 287 module_platform_driver(gsw_driver);
 288
 289 MODULE_LICENSE("GPL");
 290 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 291 MODULE_DESCRIPTION("GBit switch driver for Mediatek MT7621 SoC");
 292 MODULE_VERSION(MTK_FE_DRV_VERSION);