drivers/net/ethernet/mediatek/mtk_sgmii.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (c) 2018-2019 MediaTek Inc.
   3
   4 /* A library for MediaTek SGMII circuit
   5  *
   6  * Author: Sean Wang <sean.wang@mediatek.com>
   7  *
   8  */
   9
  10 #include <linux/mfd/syscon.h>
  11 #include <linux/of.h>
  12 #include <linux/regmap.h>
  13
  14 #include "mtk_eth_soc.h"
  15
  16 int mtk_sgmii_init(struct mtk_sgmii *ss, struct device_node *r, u32 ana_rgc3)
  17 {
  18         struct device_node *np;
  19         int i;
  20
  21         ss->ana_rgc3 = ana_rgc3;
  22
  23         for (i = 0; i < MTK_MAX_DEVS; i++) {
  24                 np = of_parse_phandle(r, "mediatek,sgmiisys", i);
  25                 if (!np)
  26                         break;
  27
  28                 ss->regmap[i] = syscon_node_to_regmap(np);
  29                 if (IS_ERR(ss->regmap[i]))
  30                         return PTR_ERR(ss->regmap[i]);
  31         }
  32
  33         return 0;
  34 }
  35
  36 int mtk_sgmii_setup_mode_an(struct mtk_sgmii *ss, int id)
  37 {
  38         unsigned int val;
  39
  40         if (!ss->regmap[id])
  41                 return -EINVAL;
  42
  43         /* Setup the link timer and QPHY power up inside SGMIISYS */
  44         regmap_write(ss->regmap[id], SGMSYS_PCS_LINK_TIMER,
  45                      SGMII_LINK_TIMER_DEFAULT);
  46
  47         regmap_read(ss->regmap[id], SGMSYS_SGMII_MODE, &val);
  48         val |= SGMII_REMOTE_FAULT_DIS;
  49         regmap_write(ss->regmap[id], SGMSYS_SGMII_MODE, val);
  50
  51         regmap_read(ss->regmap[id], SGMSYS_PCS_CONTROL_1, &val);
  52         val |= SGMII_AN_RESTART;
  53         regmap_write(ss->regmap[id], SGMSYS_PCS_CONTROL_1, val);
  54
  55         regmap_read(ss->regmap[id], SGMSYS_QPHY_PWR_STATE_CTRL, &val);
  56         val &= ~SGMII_PHYA_PWD;
  57         regmap_write(ss->regmap[id], SGMSYS_QPHY_PWR_STATE_CTRL, val);
  58
  59         return 0;
  60 }
  61
  62 int mtk_sgmii_setup_mode_force(struct mtk_sgmii *ss, int id,
  63                                const struct phylink_link_state *state)
  64 {
  65         unsigned int val;
  66
  67         if (!ss->regmap[id])
  68                 return -EINVAL;
  69
  70         regmap_read(ss->regmap[id], ss->ana_rgc3, &val);
  71         val &= ~RG_PHY_SPEED_MASK;
  72         if (state->interface == PHY_INTERFACE_MODE_2500BASEX)
  73                 val |= RG_PHY_SPEED_3_125G;
  74         regmap_write(ss->regmap[id], ss->ana_rgc3, val);
  75
  76         /* Disable SGMII AN */
  77         regmap_read(ss->regmap[id], SGMSYS_PCS_CONTROL_1, &val);
  78         val &= ~SGMII_AN_ENABLE;
  79         regmap_write(ss->regmap[id], SGMSYS_PCS_CONTROL_1, val);
  80
  81         /* SGMII force mode setting */
  82         regmap_read(ss->regmap[id], SGMSYS_SGMII_MODE, &val);
  83         val &= ~SGMII_IF_MODE_MASK;
  84
  85         switch (state->speed) {
  86         case SPEED_10:
  87                 val |= SGMII_SPEED_10;
  88                 break;
  89         case SPEED_100:
  90                 val |= SGMII_SPEED_100;
  91                 break;
  92         case SPEED_2500:
  93         case SPEED_1000:
  94                 val |= SGMII_SPEED_1000;
  95                 break;
  96         }
  97
  98         if (state->duplex == DUPLEX_FULL)
  99                 val |= SGMII_DUPLEX_FULL;
 100
 101         regmap_write(ss->regmap[id], SGMSYS_SGMII_MODE, val);
 102
 103         /* Release PHYA power down state */
 104         regmap_read(ss->regmap[id], SGMSYS_QPHY_PWR_STATE_CTRL, &val);
 105         val &= ~SGMII_PHYA_PWD;
 106         regmap_write(ss->regmap[id], SGMSYS_QPHY_PWR_STATE_CTRL, val);
 107
 108         return 0;
 109 }
 110
 111 void mtk_sgmii_restart_an(struct mtk_eth *eth, int mac_id)
 112 {
 113         struct mtk_sgmii *ss = eth->sgmii;
 114         unsigned int val, sid;
 115
 116         /* Decide how GMAC and SGMIISYS be mapped */
 117         sid = (MTK_HAS_CAPS(eth->soc->caps, MTK_SHARED_SGMII)) ?
 118                0 : mac_id;
 119
 120         if (!ss->regmap[sid])
 121                 return;
 122
 123         regmap_read(ss->regmap[sid], SGMSYS_PCS_CONTROL_1, &val);
 124         val |= SGMII_AN_RESTART;
 125         regmap_write(ss->regmap[sid], SGMSYS_PCS_CONTROL_1, val);
 126 }