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 mutex_lock(&sw_dev->device->bus->mdio_lock); 44 lan9303_mdio_real_write(sw_dev->device, reg, val & 0xffff); 45 lan9303_mdio_real_write(sw_dev->device, reg + 2, (val >> 16) & 0xffff); 46 mutex_unlock(&sw_dev->device->bus->mdio_lock); 47 48 return 0; 49 } 50 51 static u16 lan9303_mdio_real_read(struct mdio_device *mdio, int reg) 52 { 53 return mdio->bus->read(mdio->bus, PHY_ADDR(reg), PHY_REG(reg)); 54 } 55 56 static int lan9303_mdio_read(void *ctx, uint32_t reg, uint32_t *val) 57 { 58 struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx; 59 60 mutex_lock(&sw_dev->device->bus->mdio_lock); 61 *val = lan9303_mdio_real_read(sw_dev->device, reg); 62 *val |= (lan9303_mdio_real_read(sw_dev->device, reg + 2) << 16); 63 mutex_unlock(&sw_dev->device->bus->mdio_lock); 64 65 return 0; 66 } 67 68 static const struct regmap_config lan9303_mdio_regmap_config = { 69 .reg_bits = 8, 70 .val_bits = 32, 71 .reg_stride = 1, 72 .can_multi_write = true, 73 .max_register = 0x0ff, /* address bits 0..1 are not used */ 74 .reg_format_endian = REGMAP_ENDIAN_LITTLE, 75 76 .volatile_table = &lan9303_register_set, 77 .wr_table = &lan9303_register_set, 78 .rd_table = &lan9303_register_set, 79 80 .reg_read = lan9303_mdio_read, 81 .reg_write = lan9303_mdio_write, 82 83 .cache_type = REGCACHE_NONE, 84 }; 85 86 static int lan9303_mdio_probe(struct mdio_device *mdiodev) 87 { 88 struct lan9303_mdio *sw_dev; 89 int ret; 90 91 sw_dev = devm_kzalloc(&mdiodev->dev, sizeof(struct lan9303_mdio), 92 GFP_KERNEL); 93 if (!sw_dev) 94 return -ENOMEM; 95 96 sw_dev->chip.regmap = devm_regmap_init(&mdiodev->dev, NULL, sw_dev, 97 &lan9303_mdio_regmap_config); 98 if (IS_ERR(sw_dev->chip.regmap)) { 99 ret = PTR_ERR(sw_dev->chip.regmap); 100 dev_err(&mdiodev->dev, "regmap init failed: %d\n", ret); 101 return ret; 102 } 103 104 /* link forward and backward */ 105 sw_dev->device = mdiodev; 106 dev_set_drvdata(&mdiodev->dev, sw_dev); 107 sw_dev->chip.dev = &mdiodev->dev; 108 109 ret = lan9303_probe(&sw_dev->chip, mdiodev->dev.of_node); 110 if (ret != 0) 111 return ret; 112 113 dev_info(&mdiodev->dev, "LAN9303 MDIO driver loaded successfully\n"); 114 115 return 0; 116 } 117 118 static void lan9303_mdio_remove(struct mdio_device *mdiodev) 119 { 120 struct lan9303_mdio *sw_dev = dev_get_drvdata(&mdiodev->dev); 121 122 if (!sw_dev) 123 return; 124 125 lan9303_remove(&sw_dev->chip); 126 } 127 128 /*-------------------------------------------------------------------------*/ 129 130 static const struct of_device_id lan9303_mdio_of_match[] = { 131 { .compatible = "smsc,lan9303-mdio" }, 132 { /* sentinel */ }, 133 }; 134 MODULE_DEVICE_TABLE(of, lan9303_mdio_of_match); 135 136 static struct mdio_driver lan9303_mdio_driver = { 137 .mdiodrv.driver = { 138 .name = "LAN9303_MDIO", 139 .of_match_table = of_match_ptr(lan9303_mdio_of_match), 140 }, 141 .probe = lan9303_mdio_probe, 142 .remove = lan9303_mdio_remove, 143 }; 144 mdio_module_driver(lan9303_mdio_driver); 145 146 MODULE_AUTHOR("Stefan Roese <sr@denx.de>, Juergen Borleis <kernel@pengutronix.de>"); 147 MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in MDIO managed mode"); 148 MODULE_LICENSE("GPL v2"); 149