drivers/net/ethernet/qualcomm/emac/emac-sgmii-qdf2432.c

   1 /* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 and
   5  * only version 2 as published by the Free Software Foundation.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  */
  12
  13 /* Qualcomm Technologies, Inc. QDF2432 EMAC SGMII Controller driver.
  14  */
  15
  16 #include <linux/iopoll.h>
  17 #include "emac.h"
  18
  19 /* EMAC_SGMII register offsets */
  20 #define EMAC_SGMII_PHY_TX_PWR_CTRL              0x000C
  21 #define EMAC_SGMII_PHY_LANE_CTRL1               0x0018
  22 #define EMAC_SGMII_PHY_CDR_CTRL0                0x0058
  23 #define EMAC_SGMII_PHY_POW_DWN_CTRL0            0x0080
  24 #define EMAC_SGMII_PHY_RESET_CTRL               0x00a8
  25 #define EMAC_SGMII_PHY_INTERRUPT_MASK           0x00b4
  26
  27 /* SGMII digital lane registers */
  28 #define EMAC_SGMII_LN_DRVR_CTRL0                0x000C
  29 #define EMAC_SGMII_LN_DRVR_TAP_EN               0x0018
  30 #define EMAC_SGMII_LN_TX_MARGINING              0x001C
  31 #define EMAC_SGMII_LN_TX_PRE                    0x0020
  32 #define EMAC_SGMII_LN_TX_POST                   0x0024
  33 #define EMAC_SGMII_LN_TX_BAND_MODE              0x0060
  34 #define EMAC_SGMII_LN_LANE_MODE                 0x0064
  35 #define EMAC_SGMII_LN_PARALLEL_RATE             0x0078
  36 #define EMAC_SGMII_LN_CML_CTRL_MODE0            0x00B8
  37 #define EMAC_SGMII_LN_MIXER_CTRL_MODE0          0x00D0
  38 #define EMAC_SGMII_LN_VGA_INITVAL               0x0134
  39 #define EMAC_SGMII_LN_UCDR_FO_GAIN_MODE0        0x017C
  40 #define EMAC_SGMII_LN_UCDR_SO_GAIN_MODE0        0x0188
  41 #define EMAC_SGMII_LN_UCDR_SO_CONFIG            0x0194
  42 #define EMAC_SGMII_LN_RX_BAND                   0x019C
  43 #define EMAC_SGMII_LN_RX_RCVR_PATH1_MODE0       0x01B8
  44 #define EMAC_SGMII_LN_RSM_CONFIG                0x01F0
  45 #define EMAC_SGMII_LN_SIGDET_ENABLES            0x0224
  46 #define EMAC_SGMII_LN_SIGDET_CNTRL              0x0228
  47 #define EMAC_SGMII_LN_SIGDET_DEGLITCH_CNTRL     0x022C
  48 #define EMAC_SGMII_LN_RX_EN_SIGNAL              0x02A0
  49 #define EMAC_SGMII_LN_RX_MISC_CNTRL0            0x02AC
  50 #define EMAC_SGMII_LN_DRVR_LOGIC_CLKDIV         0x02BC
  51
  52 /* SGMII digital lane register values */
  53 #define UCDR_STEP_BY_TWO_MODE0                  BIT(7)
  54 #define UCDR_xO_GAIN_MODE(x)                    ((x) & 0x7f)
  55 #define UCDR_ENABLE                             BIT(6)
  56 #define UCDR_SO_SATURATION(x)                   ((x) & 0x3f)
  57
  58 #define SIGDET_LP_BYP_PS4                       BIT(7)
  59 #define SIGDET_EN_PS0_TO_PS2                    BIT(6)
  60
  61 #define TXVAL_VALID_INIT                        BIT(4)
  62 #define KR_PCIGEN3_MODE                         BIT(0)
  63
  64 #define MAIN_EN                                 BIT(0)
  65
  66 #define TX_MARGINING_MUX                        BIT(6)
  67 #define TX_MARGINING(x)                         ((x) & 0x3f)
  68
  69 #define TX_PRE_MUX                              BIT(6)
  70
  71 #define TX_POST_MUX                             BIT(6)
  72
  73 #define CML_GEAR_MODE(x)                        (((x) & 7) << 3)
  74 #define CML2CMOS_IBOOST_MODE(x)                 ((x) & 7)
  75
  76 #define MIXER_LOADB_MODE(x)                     (((x) & 0xf) << 2)
  77 #define MIXER_DATARATE_MODE(x)                  ((x) & 3)
  78
  79 #define VGA_THRESH_DFE(x)                       ((x) & 0x3f)
  80
  81 #define SIGDET_LP_BYP_PS0_TO_PS2                BIT(5)
  82 #define SIGDET_FLT_BYP                          BIT(0)
  83
  84 #define SIGDET_LVL(x)                           (((x) & 0xf) << 4)
  85
  86 #define SIGDET_DEGLITCH_CTRL(x)                 (((x) & 0xf) << 1)
  87
  88 #define DRVR_LOGIC_CLK_EN                       BIT(4)
  89 #define DRVR_LOGIC_CLK_DIV(x)                   ((x) & 0xf)
  90
  91 #define PARALLEL_RATE_MODE0(x)                  ((x) & 0x3)
  92
  93 #define BAND_MODE0(x)                           ((x) & 0x3)
  94
  95 #define LANE_MODE(x)                            ((x) & 0x1f)
  96
  97 #define CDR_PD_SEL_MODE0(x)                     (((x) & 0x3) << 5)
  98 #define BYPASS_RSM_SAMP_CAL                     BIT(1)
  99 #define BYPASS_RSM_DLL_CAL                      BIT(0)
 100
 101 #define L0_RX_EQUALIZE_ENABLE                   BIT(6)
 102
 103 #define PWRDN_B                                 BIT(0)
 104
 105 #define CDR_MAX_CNT(x)                          ((x) & 0xff)
 106
 107 #define SERDES_START_WAIT_TIMES                 100
 108
 109 struct emac_reg_write {
 110         unsigned int offset;
 111         u32 val;
 112 };
 113
 114 static void emac_reg_write_all(void __iomem *base,
 115                                const struct emac_reg_write *itr, size_t size)
 116 {
 117         size_t i;
 118
 119         for (i = 0; i < size; ++itr, ++i)
 120                 writel(itr->val, base + itr->offset);
 121 }
 122
 123 static const struct emac_reg_write sgmii_laned[] = {
 124         /* CDR Settings */
 125         {EMAC_SGMII_LN_UCDR_FO_GAIN_MODE0,
 126                 UCDR_STEP_BY_TWO_MODE0 | UCDR_xO_GAIN_MODE(10)},
 127         {EMAC_SGMII_LN_UCDR_SO_GAIN_MODE0, UCDR_xO_GAIN_MODE(0)},
 128         {EMAC_SGMII_LN_UCDR_SO_CONFIG, UCDR_ENABLE | UCDR_SO_SATURATION(12)},
 129
 130         /* TX/RX Settings */
 131         {EMAC_SGMII_LN_RX_EN_SIGNAL, SIGDET_LP_BYP_PS4 | SIGDET_EN_PS0_TO_PS2},
 132
 133         {EMAC_SGMII_LN_DRVR_CTRL0, TXVAL_VALID_INIT | KR_PCIGEN3_MODE},
 134         {EMAC_SGMII_LN_DRVR_TAP_EN, MAIN_EN},
 135         {EMAC_SGMII_LN_TX_MARGINING, TX_MARGINING_MUX | TX_MARGINING(25)},
 136         {EMAC_SGMII_LN_TX_PRE, TX_PRE_MUX},
 137         {EMAC_SGMII_LN_TX_POST, TX_POST_MUX},
 138
 139         {EMAC_SGMII_LN_CML_CTRL_MODE0,
 140                 CML_GEAR_MODE(1) | CML2CMOS_IBOOST_MODE(1)},
 141         {EMAC_SGMII_LN_MIXER_CTRL_MODE0,
 142                 MIXER_LOADB_MODE(12) | MIXER_DATARATE_MODE(1)},
 143         {EMAC_SGMII_LN_VGA_INITVAL, VGA_THRESH_DFE(31)},
 144         {EMAC_SGMII_LN_SIGDET_ENABLES,
 145                 SIGDET_LP_BYP_PS0_TO_PS2 | SIGDET_FLT_BYP},
 146         {EMAC_SGMII_LN_SIGDET_CNTRL, SIGDET_LVL(8)},
 147
 148         {EMAC_SGMII_LN_SIGDET_DEGLITCH_CNTRL, SIGDET_DEGLITCH_CTRL(4)},
 149         {EMAC_SGMII_LN_RX_MISC_CNTRL0, 0},
 150         {EMAC_SGMII_LN_DRVR_LOGIC_CLKDIV,
 151                 DRVR_LOGIC_CLK_EN | DRVR_LOGIC_CLK_DIV(4)},
 152
 153         {EMAC_SGMII_LN_PARALLEL_RATE, PARALLEL_RATE_MODE0(1)},
 154         {EMAC_SGMII_LN_TX_BAND_MODE, BAND_MODE0(2)},
 155         {EMAC_SGMII_LN_RX_BAND, BAND_MODE0(3)},
 156         {EMAC_SGMII_LN_LANE_MODE, LANE_MODE(26)},
 157         {EMAC_SGMII_LN_RX_RCVR_PATH1_MODE0, CDR_PD_SEL_MODE0(3)},
 158         {EMAC_SGMII_LN_RSM_CONFIG, BYPASS_RSM_SAMP_CAL | BYPASS_RSM_DLL_CAL},
 159 };
 160
 161 static const struct emac_reg_write physical_coding_sublayer_programming[] = {
 162         {EMAC_SGMII_PHY_POW_DWN_CTRL0, PWRDN_B},
 163         {EMAC_SGMII_PHY_CDR_CTRL0, CDR_MAX_CNT(15)},
 164         {EMAC_SGMII_PHY_TX_PWR_CTRL, 0},
 165         {EMAC_SGMII_PHY_LANE_CTRL1, L0_RX_EQUALIZE_ENABLE},
 166 };
 167
 168 int emac_sgmii_init_qdf2432(struct emac_adapter *adpt)
 169 {
 170         struct emac_sgmii *phy = &adpt->phy;
 171         void __iomem *phy_regs = phy->base;
 172         void __iomem *laned = phy->digital;
 173         unsigned int i;
 174         u32 lnstatus;
 175
 176         /* PCS lane-x init */
 177         emac_reg_write_all(phy->base, physical_coding_sublayer_programming,
 178                            ARRAY_SIZE(physical_coding_sublayer_programming));
 179
 180         /* SGMII lane-x init */
 181         emac_reg_write_all(phy->digital, sgmii_laned, ARRAY_SIZE(sgmii_laned));
 182
 183         /* Power up PCS and start reset lane state machine */
 184
 185         writel(0, phy_regs + EMAC_SGMII_PHY_RESET_CTRL);
 186         writel(1, laned + SGMII_LN_RSM_START);
 187
 188         /* Wait for c_ready assertion */
 189         for (i = 0; i < SERDES_START_WAIT_TIMES; i++) {
 190                 lnstatus = readl(phy_regs + SGMII_PHY_LN_LANE_STATUS);
 191                 if (lnstatus & BIT(1))
 192                         break;
 193                 usleep_range(100, 200);
 194         }
 195
 196         if (i == SERDES_START_WAIT_TIMES) {
 197                 netdev_err(adpt->netdev, "SGMII failed to start\n");
 198                 return -EIO;
 199         }
 200
 201         /* Disable digital and SERDES loopback */
 202         writel(0, phy_regs + SGMII_PHY_LN_BIST_GEN0);
 203         writel(0, phy_regs + SGMII_PHY_LN_BIST_GEN2);
 204         writel(0, phy_regs + SGMII_PHY_LN_CDR_CTRL1);
 205
 206         /* Mask out all the SGMII Interrupt */
 207         writel(0, phy_regs + EMAC_SGMII_PHY_INTERRUPT_MASK);
 208
 209         return 0;
 210 }