1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2011 - 2012 Cavium, Inc. 4 */ 5 6 #include <linux/module.h> 7 #include <linux/phy.h> 8 #include <linux/of.h> 9 10 #define PHY_ID_BCM8706 0x0143bdc1 11 #define PHY_ID_BCM8727 0x0143bff0 12 13 #define BCM87XX_PMD_RX_SIGNAL_DETECT 0x000a 14 #define BCM87XX_10GBASER_PCS_STATUS 0x0020 15 #define BCM87XX_XGXS_LANE_STATUS 0x0018 16 17 #define BCM87XX_LASI_CONTROL 0x9002 18 #define BCM87XX_LASI_STATUS 0x9005 19 20 #if IS_ENABLED(CONFIG_OF_MDIO) 21 /* Set and/or override some configuration registers based on the 22 * broadcom,c45-reg-init property stored in the of_node for the phydev. 23 * 24 * broadcom,c45-reg-init = <devid reg mask value>,...; 25 * 26 * There may be one or more sets of <devid reg mask value>: 27 * 28 * devid: which sub-device to use. 29 * reg: the register. 30 * mask: if non-zero, ANDed with existing register value. 31 * value: ORed with the masked value and written to the regiser. 32 * 33 */ 34 static int bcm87xx_of_reg_init(struct phy_device *phydev) 35 { 36 const __be32 *paddr; 37 const __be32 *paddr_end; 38 int len, ret; 39 40 if (!phydev->mdio.dev.of_node) 41 return 0; 42 43 paddr = of_get_property(phydev->mdio.dev.of_node, 44 "broadcom,c45-reg-init", &len); 45 if (!paddr) 46 return 0; 47 48 paddr_end = paddr + (len /= sizeof(*paddr)); 49 50 ret = 0; 51 52 while (paddr + 3 < paddr_end) { 53 u16 devid = be32_to_cpup(paddr++); 54 u16 reg = be32_to_cpup(paddr++); 55 u16 mask = be32_to_cpup(paddr++); 56 u16 val_bits = be32_to_cpup(paddr++); 57 int val = 0; 58 59 if (mask) { 60 val = phy_read_mmd(phydev, devid, reg); 61 if (val < 0) { 62 ret = val; 63 goto err; 64 } 65 val &= mask; 66 } 67 val |= val_bits; 68 69 ret = phy_write_mmd(phydev, devid, reg, val); 70 if (ret < 0) 71 goto err; 72 } 73 err: 74 return ret; 75 } 76 #else 77 static int bcm87xx_of_reg_init(struct phy_device *phydev) 78 { 79 return 0; 80 } 81 #endif /* CONFIG_OF_MDIO */ 82 83 static int bcm87xx_get_features(struct phy_device *phydev) 84 { 85 linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseR_FEC_BIT, 86 phydev->supported); 87 return 0; 88 } 89 90 static int bcm87xx_config_init(struct phy_device *phydev) 91 { 92 return bcm87xx_of_reg_init(phydev); 93 } 94 95 static int bcm87xx_config_aneg(struct phy_device *phydev) 96 { 97 return -EINVAL; 98 } 99 100 static int bcm87xx_read_status(struct phy_device *phydev) 101 { 102 int rx_signal_detect; 103 int pcs_status; 104 int xgxs_lane_status; 105 106 rx_signal_detect = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, 107 BCM87XX_PMD_RX_SIGNAL_DETECT); 108 if (rx_signal_detect < 0) 109 return rx_signal_detect; 110 111 if ((rx_signal_detect & 1) == 0) 112 goto no_link; 113 114 pcs_status = phy_read_mmd(phydev, MDIO_MMD_PCS, 115 BCM87XX_10GBASER_PCS_STATUS); 116 if (pcs_status < 0) 117 return pcs_status; 118 119 if ((pcs_status & 1) == 0) 120 goto no_link; 121 122 xgxs_lane_status = phy_read_mmd(phydev, MDIO_MMD_PHYXS, 123 BCM87XX_XGXS_LANE_STATUS); 124 if (xgxs_lane_status < 0) 125 return xgxs_lane_status; 126 127 if ((xgxs_lane_status & 0x1000) == 0) 128 goto no_link; 129 130 phydev->speed = 10000; 131 phydev->link = 1; 132 phydev->duplex = 1; 133 return 0; 134 135 no_link: 136 phydev->link = 0; 137 return 0; 138 } 139 140 static int bcm87xx_config_intr(struct phy_device *phydev) 141 { 142 int reg, err; 143 144 reg = phy_read_mmd(phydev, MDIO_MMD_PCS, BCM87XX_LASI_CONTROL); 145 146 if (reg < 0) 147 return reg; 148 149 if (phydev->interrupts == PHY_INTERRUPT_ENABLED) { 150 err = phy_read_mmd(phydev, MDIO_MMD_PCS, BCM87XX_LASI_STATUS); 151 if (err) 152 return err; 153 154 reg |= 1; 155 err = phy_write_mmd(phydev, MDIO_MMD_PCS, 156 BCM87XX_LASI_CONTROL, reg); 157 } else { 158 reg &= ~1; 159 err = phy_write_mmd(phydev, MDIO_MMD_PCS, 160 BCM87XX_LASI_CONTROL, reg); 161 if (err) 162 return err; 163 164 err = phy_read_mmd(phydev, MDIO_MMD_PCS, BCM87XX_LASI_STATUS); 165 } 166 167 return err; 168 } 169 170 static irqreturn_t bcm87xx_handle_interrupt(struct phy_device *phydev) 171 { 172 int irq_status; 173 174 irq_status = phy_read(phydev, BCM87XX_LASI_STATUS); 175 if (irq_status < 0) { 176 phy_error(phydev); 177 return IRQ_NONE; 178 } 179 180 if (irq_status == 0) 181 return IRQ_NONE; 182 183 phy_trigger_machine(phydev); 184 185 return IRQ_HANDLED; 186 } 187 188 static int bcm8706_match_phy_device(struct phy_device *phydev) 189 { 190 return phydev->c45_ids.device_ids[4] == PHY_ID_BCM8706; 191 } 192 193 static int bcm8727_match_phy_device(struct phy_device *phydev) 194 { 195 return phydev->c45_ids.device_ids[4] == PHY_ID_BCM8727; 196 } 197 198 static struct phy_driver bcm87xx_driver[] = { 199 { 200 .phy_id = PHY_ID_BCM8706, 201 .phy_id_mask = 0xffffffff, 202 .name = "Broadcom BCM8706", 203 .get_features = bcm87xx_get_features, 204 .config_init = bcm87xx_config_init, 205 .config_aneg = bcm87xx_config_aneg, 206 .read_status = bcm87xx_read_status, 207 .config_intr = bcm87xx_config_intr, 208 .handle_interrupt = bcm87xx_handle_interrupt, 209 .match_phy_device = bcm8706_match_phy_device, 210 }, { 211 .phy_id = PHY_ID_BCM8727, 212 .phy_id_mask = 0xffffffff, 213 .name = "Broadcom BCM8727", 214 .get_features = bcm87xx_get_features, 215 .config_init = bcm87xx_config_init, 216 .config_aneg = bcm87xx_config_aneg, 217 .read_status = bcm87xx_read_status, 218 .config_intr = bcm87xx_config_intr, 219 .handle_interrupt = bcm87xx_handle_interrupt, 220 .match_phy_device = bcm8727_match_phy_device, 221 } }; 222 223 module_phy_driver(bcm87xx_driver); 224 225 MODULE_LICENSE("GPL v2"); 226 MODULE_DESCRIPTION("Broadcom BCM87xx PHY driver"); 227