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. QDF2400 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 0x007C 36 #define EMAC_SGMII_LN_CML_CTRL_MODE0 0x00C0 37 #define EMAC_SGMII_LN_MIXER_CTRL_MODE0 0x00D8 38 #define EMAC_SGMII_LN_VGA_INITVAL 0x013C 39 #define EMAC_SGMII_LN_UCDR_FO_GAIN_MODE0 0x0184 40 #define EMAC_SGMII_LN_UCDR_SO_GAIN_MODE0 0x0190 41 #define EMAC_SGMII_LN_UCDR_SO_CONFIG 0x019C 42 #define EMAC_SGMII_LN_RX_BAND 0x01A4 43 #define EMAC_SGMII_LN_RX_RCVR_PATH1_MODE0 0x01C0 44 #define EMAC_SGMII_LN_RSM_CONFIG 0x01F8 45 #define EMAC_SGMII_LN_SIGDET_ENABLES 0x0230 46 #define EMAC_SGMII_LN_SIGDET_CNTRL 0x0234 47 #define EMAC_SGMII_LN_SIGDET_DEGLITCH_CNTRL 0x0238 48 #define EMAC_SGMII_LN_RX_EN_SIGNAL 0x02AC 49 #define EMAC_SGMII_LN_RX_MISC_CNTRL0 0x02B8 50 #define EMAC_SGMII_LN_DRVR_LOGIC_CLKDIV 0x02C8 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 INVERT_PCS_RX_CLK BIT(7) 89 90 #define DRVR_LOGIC_CLK_EN BIT(4) 91 #define DRVR_LOGIC_CLK_DIV(x) ((x) & 0xf) 92 93 #define PARALLEL_RATE_MODE0(x) ((x) & 0x3) 94 95 #define BAND_MODE0(x) ((x) & 0x3) 96 97 #define LANE_MODE(x) ((x) & 0x1f) 98 99 #define CDR_PD_SEL_MODE0(x) (((x) & 0x3) << 5) 100 #define EN_DLL_MODE0 BIT(4) 101 #define EN_IQ_DCC_MODE0 BIT(3) 102 #define EN_IQCAL_MODE0 BIT(2) 103 104 #define BYPASS_RSM_SAMP_CAL BIT(1) 105 #define BYPASS_RSM_DLL_CAL BIT(0) 106 107 #define L0_RX_EQUALIZE_ENABLE BIT(6) 108 109 #define PWRDN_B BIT(0) 110 111 #define CDR_MAX_CNT(x) ((x) & 0xff) 112 113 #define SERDES_START_WAIT_TIMES 100 114 115 struct emac_reg_write { 116 unsigned int offset; 117 u32 val; 118 }; 119 120 static void emac_reg_write_all(void __iomem *base, 121 const struct emac_reg_write *itr, size_t size) 122 { 123 size_t i; 124 125 for (i = 0; i < size; ++itr, ++i) 126 writel(itr->val, base + itr->offset); 127 } 128 129 static const struct emac_reg_write sgmii_laned[] = { 130 /* CDR Settings */ 131 {EMAC_SGMII_LN_UCDR_FO_GAIN_MODE0, 132 UCDR_STEP_BY_TWO_MODE0 | UCDR_xO_GAIN_MODE(10)}, 133 {EMAC_SGMII_LN_UCDR_SO_GAIN_MODE0, UCDR_xO_GAIN_MODE(0)}, 134 {EMAC_SGMII_LN_UCDR_SO_CONFIG, UCDR_ENABLE | UCDR_SO_SATURATION(12)}, 135 136 /* TX/RX Settings */ 137 {EMAC_SGMII_LN_RX_EN_SIGNAL, SIGDET_LP_BYP_PS4 | SIGDET_EN_PS0_TO_PS2}, 138 139 {EMAC_SGMII_LN_DRVR_CTRL0, TXVAL_VALID_INIT | KR_PCIGEN3_MODE}, 140 {EMAC_SGMII_LN_DRVR_TAP_EN, MAIN_EN}, 141 {EMAC_SGMII_LN_TX_MARGINING, TX_MARGINING_MUX | TX_MARGINING(25)}, 142 {EMAC_SGMII_LN_TX_PRE, TX_PRE_MUX}, 143 {EMAC_SGMII_LN_TX_POST, TX_POST_MUX}, 144 145 {EMAC_SGMII_LN_CML_CTRL_MODE0, 146 CML_GEAR_MODE(1) | CML2CMOS_IBOOST_MODE(1)}, 147 {EMAC_SGMII_LN_MIXER_CTRL_MODE0, 148 MIXER_LOADB_MODE(12) | MIXER_DATARATE_MODE(1)}, 149 {EMAC_SGMII_LN_VGA_INITVAL, VGA_THRESH_DFE(31)}, 150 {EMAC_SGMII_LN_SIGDET_ENABLES, 151 SIGDET_LP_BYP_PS0_TO_PS2 | SIGDET_FLT_BYP}, 152 {EMAC_SGMII_LN_SIGDET_CNTRL, SIGDET_LVL(8)}, 153 154 {EMAC_SGMII_LN_SIGDET_DEGLITCH_CNTRL, SIGDET_DEGLITCH_CTRL(4)}, 155 {EMAC_SGMII_LN_RX_MISC_CNTRL0, INVERT_PCS_RX_CLK}, 156 {EMAC_SGMII_LN_DRVR_LOGIC_CLKDIV, 157 DRVR_LOGIC_CLK_EN | DRVR_LOGIC_CLK_DIV(4)}, 158 159 {EMAC_SGMII_LN_PARALLEL_RATE, PARALLEL_RATE_MODE0(1)}, 160 {EMAC_SGMII_LN_TX_BAND_MODE, BAND_MODE0(1)}, 161 {EMAC_SGMII_LN_RX_BAND, BAND_MODE0(2)}, 162 {EMAC_SGMII_LN_LANE_MODE, LANE_MODE(26)}, 163 {EMAC_SGMII_LN_RX_RCVR_PATH1_MODE0, CDR_PD_SEL_MODE0(2) | 164 EN_DLL_MODE0 | EN_IQ_DCC_MODE0 | EN_IQCAL_MODE0}, 165 {EMAC_SGMII_LN_RSM_CONFIG, BYPASS_RSM_SAMP_CAL | BYPASS_RSM_DLL_CAL}, 166 }; 167 168 static const struct emac_reg_write physical_coding_sublayer_programming[] = { 169 {EMAC_SGMII_PHY_POW_DWN_CTRL0, PWRDN_B}, 170 {EMAC_SGMII_PHY_CDR_CTRL0, CDR_MAX_CNT(15)}, 171 {EMAC_SGMII_PHY_TX_PWR_CTRL, 0}, 172 {EMAC_SGMII_PHY_LANE_CTRL1, L0_RX_EQUALIZE_ENABLE}, 173 }; 174 175 int emac_sgmii_init_qdf2400(struct emac_adapter *adpt) 176 { 177 struct emac_sgmii *phy = &adpt->phy; 178 void __iomem *phy_regs = phy->base; 179 void __iomem *laned = phy->digital; 180 unsigned int i; 181 u32 lnstatus; 182 183 /* PCS lane-x init */ 184 emac_reg_write_all(phy->base, physical_coding_sublayer_programming, 185 ARRAY_SIZE(physical_coding_sublayer_programming)); 186 187 /* SGMII lane-x init */ 188 emac_reg_write_all(phy->digital, sgmii_laned, ARRAY_SIZE(sgmii_laned)); 189 190 /* Power up PCS and start reset lane state machine */ 191 192 writel(0, phy_regs + EMAC_SGMII_PHY_RESET_CTRL); 193 writel(1, laned + SGMII_LN_RSM_START); 194 195 /* Wait for c_ready assertion */ 196 for (i = 0; i < SERDES_START_WAIT_TIMES; i++) { 197 lnstatus = readl(phy_regs + SGMII_PHY_LN_LANE_STATUS); 198 if (lnstatus & BIT(1)) 199 break; 200 usleep_range(100, 200); 201 } 202 203 if (i == SERDES_START_WAIT_TIMES) { 204 netdev_err(adpt->netdev, "SGMII failed to start\n"); 205 return -EIO; 206 } 207 208 /* Disable digital and SERDES loopback */ 209 writel(0, phy_regs + SGMII_PHY_LN_BIST_GEN0); 210 writel(0, phy_regs + SGMII_PHY_LN_BIST_GEN2); 211 writel(0, phy_regs + SGMII_PHY_LN_CDR_CTRL1); 212 213 /* Mask out all the SGMII Interrupt */ 214 writel(0, phy_regs + EMAC_SGMII_PHY_INTERRUPT_MASK); 215 216 return 0; 217 } 218