1 /* 2 * Fixed MDIO bus (MDIO bus emulation with fixed PHYs) 3 * 4 * Author: Vitaly Bordug <vbordug@ru.mvista.com> 5 * Anton Vorontsov <avorontsov@ru.mvista.com> 6 * 7 * Copyright (c) 2006-2007 MontaVista Software, Inc. 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/platform_device.h> 18 #include <linux/list.h> 19 #include <linux/mii.h> 20 #include <linux/phy.h> 21 #include <linux/phy_fixed.h> 22 #include <linux/err.h> 23 #include <linux/slab.h> 24 #include <linux/of.h> 25 26 #define MII_REGS_NUM 29 27 28 struct fixed_mdio_bus { 29 int irqs[PHY_MAX_ADDR]; 30 struct mii_bus *mii_bus; 31 struct list_head phys; 32 }; 33 34 struct fixed_phy { 35 int addr; 36 u16 regs[MII_REGS_NUM]; 37 struct phy_device *phydev; 38 struct fixed_phy_status status; 39 int (*link_update)(struct net_device *, struct fixed_phy_status *); 40 struct list_head node; 41 }; 42 43 static struct platform_device *pdev; 44 static struct fixed_mdio_bus platform_fmb = { 45 .phys = LIST_HEAD_INIT(platform_fmb.phys), 46 }; 47 48 static int fixed_phy_update_regs(struct fixed_phy *fp) 49 { 50 u16 bmsr = BMSR_ANEGCAPABLE; 51 u16 bmcr = 0; 52 u16 lpagb = 0; 53 u16 lpa = 0; 54 55 if (fp->status.duplex) { 56 bmcr |= BMCR_FULLDPLX; 57 58 switch (fp->status.speed) { 59 case 1000: 60 bmsr |= BMSR_ESTATEN; 61 bmcr |= BMCR_SPEED1000; 62 lpagb |= LPA_1000FULL; 63 break; 64 case 100: 65 bmsr |= BMSR_100FULL; 66 bmcr |= BMCR_SPEED100; 67 lpa |= LPA_100FULL; 68 break; 69 case 10: 70 bmsr |= BMSR_10FULL; 71 lpa |= LPA_10FULL; 72 break; 73 default: 74 pr_warn("fixed phy: unknown speed\n"); 75 return -EINVAL; 76 } 77 } else { 78 switch (fp->status.speed) { 79 case 1000: 80 bmsr |= BMSR_ESTATEN; 81 bmcr |= BMCR_SPEED1000; 82 lpagb |= LPA_1000HALF; 83 break; 84 case 100: 85 bmsr |= BMSR_100HALF; 86 bmcr |= BMCR_SPEED100; 87 lpa |= LPA_100HALF; 88 break; 89 case 10: 90 bmsr |= BMSR_10HALF; 91 lpa |= LPA_10HALF; 92 break; 93 default: 94 pr_warn("fixed phy: unknown speed\n"); 95 return -EINVAL; 96 } 97 } 98 99 if (fp->status.link) 100 bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE; 101 102 if (fp->status.pause) 103 lpa |= LPA_PAUSE_CAP; 104 105 if (fp->status.asym_pause) 106 lpa |= LPA_PAUSE_ASYM; 107 108 fp->regs[MII_PHYSID1] = 0; 109 fp->regs[MII_PHYSID2] = 0; 110 111 fp->regs[MII_BMSR] = bmsr; 112 fp->regs[MII_BMCR] = bmcr; 113 fp->regs[MII_LPA] = lpa; 114 fp->regs[MII_STAT1000] = lpagb; 115 116 return 0; 117 } 118 119 static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num) 120 { 121 struct fixed_mdio_bus *fmb = bus->priv; 122 struct fixed_phy *fp; 123 124 if (reg_num >= MII_REGS_NUM) 125 return -1; 126 127 /* We do not support emulating Clause 45 over Clause 22 register reads 128 * return an error instead of bogus data. 129 */ 130 switch (reg_num) { 131 case MII_MMD_CTRL: 132 case MII_MMD_DATA: 133 return -1; 134 default: 135 break; 136 } 137 138 list_for_each_entry(fp, &fmb->phys, node) { 139 if (fp->addr == phy_addr) { 140 /* Issue callback if user registered it. */ 141 if (fp->link_update) { 142 fp->link_update(fp->phydev->attached_dev, 143 &fp->status); 144 fixed_phy_update_regs(fp); 145 } 146 return fp->regs[reg_num]; 147 } 148 } 149 150 return 0xFFFF; 151 } 152 153 static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num, 154 u16 val) 155 { 156 return 0; 157 } 158 159 /* 160 * If something weird is required to be done with link/speed, 161 * network driver is able to assign a function to implement this. 162 * May be useful for PHY's that need to be software-driven. 163 */ 164 int fixed_phy_set_link_update(struct phy_device *phydev, 165 int (*link_update)(struct net_device *, 166 struct fixed_phy_status *)) 167 { 168 struct fixed_mdio_bus *fmb = &platform_fmb; 169 struct fixed_phy *fp; 170 171 if (!phydev || !phydev->bus) 172 return -EINVAL; 173 174 list_for_each_entry(fp, &fmb->phys, node) { 175 if (fp->addr == phydev->addr) { 176 fp->link_update = link_update; 177 fp->phydev = phydev; 178 return 0; 179 } 180 } 181 182 return -ENOENT; 183 } 184 EXPORT_SYMBOL_GPL(fixed_phy_set_link_update); 185 186 int fixed_phy_update_state(struct phy_device *phydev, 187 const struct fixed_phy_status *status, 188 const struct fixed_phy_status *changed) 189 { 190 struct fixed_mdio_bus *fmb = &platform_fmb; 191 struct fixed_phy *fp; 192 193 if (!phydev || !phydev->bus) 194 return -EINVAL; 195 196 list_for_each_entry(fp, &fmb->phys, node) { 197 if (fp->addr == phydev->addr) { 198 #define _UPD(x) if (changed->x) \ 199 fp->status.x = status->x 200 _UPD(link); 201 _UPD(speed); 202 _UPD(duplex); 203 _UPD(pause); 204 _UPD(asym_pause); 205 #undef _UPD 206 fixed_phy_update_regs(fp); 207 return 0; 208 } 209 } 210 211 return -ENOENT; 212 } 213 EXPORT_SYMBOL(fixed_phy_update_state); 214 215 int fixed_phy_add(unsigned int irq, int phy_addr, 216 struct fixed_phy_status *status) 217 { 218 int ret; 219 struct fixed_mdio_bus *fmb = &platform_fmb; 220 struct fixed_phy *fp; 221 222 fp = kzalloc(sizeof(*fp), GFP_KERNEL); 223 if (!fp) 224 return -ENOMEM; 225 226 memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM); 227 228 fmb->irqs[phy_addr] = irq; 229 230 fp->addr = phy_addr; 231 fp->status = *status; 232 233 ret = fixed_phy_update_regs(fp); 234 if (ret) 235 goto err_regs; 236 237 list_add_tail(&fp->node, &fmb->phys); 238 239 return 0; 240 241 err_regs: 242 kfree(fp); 243 return ret; 244 } 245 EXPORT_SYMBOL_GPL(fixed_phy_add); 246 247 void fixed_phy_del(int phy_addr) 248 { 249 struct fixed_mdio_bus *fmb = &platform_fmb; 250 struct fixed_phy *fp, *tmp; 251 252 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) { 253 if (fp->addr == phy_addr) { 254 list_del(&fp->node); 255 kfree(fp); 256 return; 257 } 258 } 259 } 260 EXPORT_SYMBOL_GPL(fixed_phy_del); 261 262 static int phy_fixed_addr; 263 static DEFINE_SPINLOCK(phy_fixed_addr_lock); 264 265 struct phy_device *fixed_phy_register(unsigned int irq, 266 struct fixed_phy_status *status, 267 struct device_node *np) 268 { 269 struct fixed_mdio_bus *fmb = &platform_fmb; 270 struct phy_device *phy; 271 int phy_addr; 272 int ret; 273 274 /* Get the next available PHY address, up to PHY_MAX_ADDR */ 275 spin_lock(&phy_fixed_addr_lock); 276 if (phy_fixed_addr == PHY_MAX_ADDR) { 277 spin_unlock(&phy_fixed_addr_lock); 278 return ERR_PTR(-ENOSPC); 279 } 280 phy_addr = phy_fixed_addr++; 281 spin_unlock(&phy_fixed_addr_lock); 282 283 ret = fixed_phy_add(PHY_POLL, phy_addr, status); 284 if (ret < 0) 285 return ERR_PTR(ret); 286 287 phy = get_phy_device(fmb->mii_bus, phy_addr, false); 288 if (!phy || IS_ERR(phy)) { 289 fixed_phy_del(phy_addr); 290 return ERR_PTR(-EINVAL); 291 } 292 293 of_node_get(np); 294 phy->dev.of_node = np; 295 296 ret = phy_device_register(phy); 297 if (ret) { 298 phy_device_free(phy); 299 of_node_put(np); 300 fixed_phy_del(phy_addr); 301 return ERR_PTR(ret); 302 } 303 304 return phy; 305 } 306 EXPORT_SYMBOL_GPL(fixed_phy_register); 307 308 static int __init fixed_mdio_bus_init(void) 309 { 310 struct fixed_mdio_bus *fmb = &platform_fmb; 311 int ret; 312 313 pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0); 314 if (IS_ERR(pdev)) { 315 ret = PTR_ERR(pdev); 316 goto err_pdev; 317 } 318 319 fmb->mii_bus = mdiobus_alloc(); 320 if (fmb->mii_bus == NULL) { 321 ret = -ENOMEM; 322 goto err_mdiobus_reg; 323 } 324 325 snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0"); 326 fmb->mii_bus->name = "Fixed MDIO Bus"; 327 fmb->mii_bus->priv = fmb; 328 fmb->mii_bus->parent = &pdev->dev; 329 fmb->mii_bus->read = &fixed_mdio_read; 330 fmb->mii_bus->write = &fixed_mdio_write; 331 fmb->mii_bus->irq = fmb->irqs; 332 333 ret = mdiobus_register(fmb->mii_bus); 334 if (ret) 335 goto err_mdiobus_alloc; 336 337 return 0; 338 339 err_mdiobus_alloc: 340 mdiobus_free(fmb->mii_bus); 341 err_mdiobus_reg: 342 platform_device_unregister(pdev); 343 err_pdev: 344 return ret; 345 } 346 module_init(fixed_mdio_bus_init); 347 348 static void __exit fixed_mdio_bus_exit(void) 349 { 350 struct fixed_mdio_bus *fmb = &platform_fmb; 351 struct fixed_phy *fp, *tmp; 352 353 mdiobus_unregister(fmb->mii_bus); 354 mdiobus_free(fmb->mii_bus); 355 platform_device_unregister(pdev); 356 357 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) { 358 list_del(&fp->node); 359 kfree(fp); 360 } 361 } 362 module_exit(fixed_mdio_bus_exit); 363 364 MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)"); 365 MODULE_AUTHOR("Vitaly Bordug"); 366 MODULE_LICENSE("GPL"); 367