1 /* 2 * Copyright (C) 2017 Pengutronix, Juergen Borleis <kernel@pengutronix.de> 3 * 4 * Partially based on a patch from 5 * Copyright (c) 2014 Stefan Roese <sr@denx.de> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * version 2, as published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 */ 17 #include <linux/kernel.h> 18 #include <linux/module.h> 19 #include <linux/mdio.h> 20 #include <linux/phy.h> 21 #include <linux/of.h> 22 23 #include "lan9303.h" 24 25 /* Generate phy-addr and -reg from the input address */ 26 #define PHY_ADDR(x) ((((x) >> 6) + 0x10) & 0x1f) 27 #define PHY_REG(x) (((x) >> 1) & 0x1f) 28 29 struct lan9303_mdio { 30 struct mdio_device *device; 31 struct lan9303 chip; 32 }; 33 34 static void lan9303_mdio_real_write(struct mdio_device *mdio, int reg, u16 val) 35 { 36 mdio->bus->write(mdio->bus, PHY_ADDR(reg), PHY_REG(reg), val); 37 } 38 39 static int lan9303_mdio_write(void *ctx, uint32_t reg, uint32_t val) 40 { 41 struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx; 42 43 reg <<= 2; /* reg num to offset */ 44 mutex_lock(&sw_dev->device->bus->mdio_lock); 45 lan9303_mdio_real_write(sw_dev->device, reg, val & 0xffff); 46 lan9303_mdio_real_write(sw_dev->device, reg + 2, (val >> 16) & 0xffff); 47 mutex_unlock(&sw_dev->device->bus->mdio_lock); 48 49 return 0; 50 } 51 52 static u16 lan9303_mdio_real_read(struct mdio_device *mdio, int reg) 53 { 54 return mdio->bus->read(mdio->bus, PHY_ADDR(reg), PHY_REG(reg)); 55 } 56 57 static int lan9303_mdio_read(void *ctx, uint32_t reg, uint32_t *val) 58 { 59 struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx; 60 61 reg <<= 2; /* reg num to offset */ 62 mutex_lock(&sw_dev->device->bus->mdio_lock); 63 *val = lan9303_mdio_real_read(sw_dev->device, reg); 64 *val |= (lan9303_mdio_real_read(sw_dev->device, reg + 2) << 16); 65 mutex_unlock(&sw_dev->device->bus->mdio_lock); 66 67 return 0; 68 } 69 70 int lan9303_mdio_phy_write(struct lan9303 *chip, int phy, int reg, u16 val) 71 { 72 struct lan9303_mdio *sw_dev = dev_get_drvdata(chip->dev); 73 74 return mdiobus_write_nested(sw_dev->device->bus, phy, reg, val); 75 } 76 77 int lan9303_mdio_phy_read(struct lan9303 *chip, int phy, int reg) 78 { 79 struct lan9303_mdio *sw_dev = dev_get_drvdata(chip->dev); 80 81 return mdiobus_read_nested(sw_dev->device->bus, phy, reg); 82 } 83 84 static const struct lan9303_phy_ops lan9303_mdio_phy_ops = { 85 .phy_read = lan9303_mdio_phy_read, 86 .phy_write = lan9303_mdio_phy_write, 87 }; 88 89 static const struct regmap_config lan9303_mdio_regmap_config = { 90 .reg_bits = 8, 91 .val_bits = 32, 92 .reg_stride = 1, 93 .can_multi_write = true, 94 .max_register = 0x0ff, /* address bits 0..1 are not used */ 95 .reg_format_endian = REGMAP_ENDIAN_LITTLE, 96 97 .volatile_table = &lan9303_register_set, 98 .wr_table = &lan9303_register_set, 99 .rd_table = &lan9303_register_set, 100 101 .reg_read = lan9303_mdio_read, 102 .reg_write = lan9303_mdio_write, 103 104 .cache_type = REGCACHE_NONE, 105 }; 106 107 static int lan9303_mdio_probe(struct mdio_device *mdiodev) 108 { 109 struct lan9303_mdio *sw_dev; 110 int ret; 111 112 sw_dev = devm_kzalloc(&mdiodev->dev, sizeof(struct lan9303_mdio), 113 GFP_KERNEL); 114 if (!sw_dev) 115 return -ENOMEM; 116 117 sw_dev->chip.regmap = devm_regmap_init(&mdiodev->dev, NULL, sw_dev, 118 &lan9303_mdio_regmap_config); 119 if (IS_ERR(sw_dev->chip.regmap)) { 120 ret = PTR_ERR(sw_dev->chip.regmap); 121 dev_err(&mdiodev->dev, "regmap init failed: %d\n", ret); 122 return ret; 123 } 124 125 /* link forward and backward */ 126 sw_dev->device = mdiodev; 127 dev_set_drvdata(&mdiodev->dev, sw_dev); 128 sw_dev->chip.dev = &mdiodev->dev; 129 130 sw_dev->chip.ops = &lan9303_mdio_phy_ops; 131 132 ret = lan9303_probe(&sw_dev->chip, mdiodev->dev.of_node); 133 if (ret != 0) 134 return ret; 135 136 dev_info(&mdiodev->dev, "LAN9303 MDIO driver loaded successfully\n"); 137 138 return 0; 139 } 140 141 static void lan9303_mdio_remove(struct mdio_device *mdiodev) 142 { 143 struct lan9303_mdio *sw_dev = dev_get_drvdata(&mdiodev->dev); 144 145 if (!sw_dev) 146 return; 147 148 lan9303_remove(&sw_dev->chip); 149 } 150 151 /*-------------------------------------------------------------------------*/ 152 153 static const struct of_device_id lan9303_mdio_of_match[] = { 154 { .compatible = "smsc,lan9303-mdio" }, 155 { /* sentinel */ }, 156 }; 157 MODULE_DEVICE_TABLE(of, lan9303_mdio_of_match); 158 159 static struct mdio_driver lan9303_mdio_driver = { 160 .mdiodrv.driver = { 161 .name = "LAN9303_MDIO", 162 .of_match_table = of_match_ptr(lan9303_mdio_of_match), 163 }, 164 .probe = lan9303_mdio_probe, 165 .remove = lan9303_mdio_remove, 166 }; 167 mdio_module_driver(lan9303_mdio_driver); 168 169 MODULE_AUTHOR("Stefan Roese <sr@denx.de>, Juergen Borleis <kernel@pengutronix.de>"); 170 MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in MDIO managed mode"); 171 MODULE_LICENSE("GPL v2"); 172