Vitaly Bordug | 11b0bac | 2006-08-14 23:00:29 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/net/phy/fixed.c |
| 3 | * |
| 4 | * Driver for fixed PHYs, when transceiver is able to operate in one fixed mode. |
| 5 | * |
| 6 | * Author: Vitaly Bordug |
| 7 | * |
| 8 | * Copyright (c) 2006 MontaVista Software, Inc. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify it |
| 11 | * under the terms of the GNU General Public License as published by the |
| 12 | * Free Software Foundation; either version 2 of the License, or (at your |
| 13 | * option) any later version. |
| 14 | * |
| 15 | */ |
Vitaly Bordug | 11b0bac | 2006-08-14 23:00:29 -0700 | [diff] [blame] | 16 | #include <linux/kernel.h> |
Vitaly Bordug | 11b0bac | 2006-08-14 23:00:29 -0700 | [diff] [blame] | 17 | #include <linux/string.h> |
| 18 | #include <linux/errno.h> |
| 19 | #include <linux/unistd.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <linux/interrupt.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/delay.h> |
| 24 | #include <linux/netdevice.h> |
| 25 | #include <linux/etherdevice.h> |
| 26 | #include <linux/skbuff.h> |
| 27 | #include <linux/spinlock.h> |
| 28 | #include <linux/mm.h> |
| 29 | #include <linux/module.h> |
| 30 | #include <linux/mii.h> |
| 31 | #include <linux/ethtool.h> |
| 32 | #include <linux/phy.h> |
| 33 | |
| 34 | #include <asm/io.h> |
| 35 | #include <asm/irq.h> |
| 36 | #include <asm/uaccess.h> |
| 37 | |
| 38 | #define MII_REGS_NUM 7 |
| 39 | |
| 40 | /* |
| 41 | The idea is to emulate normal phy behavior by responding with |
| 42 | pre-defined values to mii BMCR read, so that read_status hook could |
| 43 | take all the needed info. |
| 44 | */ |
| 45 | |
| 46 | struct fixed_phy_status { |
| 47 | u8 link; |
| 48 | u16 speed; |
| 49 | u8 duplex; |
| 50 | }; |
| 51 | |
| 52 | /*----------------------------------------------------------------------------- |
| 53 | * Private information hoder for mii_bus |
| 54 | *-----------------------------------------------------------------------------*/ |
| 55 | struct fixed_info { |
| 56 | u16 *regs; |
| 57 | u8 regs_num; |
| 58 | struct fixed_phy_status phy_status; |
| 59 | struct phy_device *phydev; /* pointer to the container */ |
| 60 | /* link & speed cb */ |
| 61 | int(*link_update)(struct net_device*, struct fixed_phy_status*); |
| 62 | |
| 63 | }; |
| 64 | |
| 65 | /*----------------------------------------------------------------------------- |
| 66 | * If something weird is required to be done with link/speed, |
| 67 | * network driver is able to assign a function to implement this. |
| 68 | * May be useful for PHY's that need to be software-driven. |
| 69 | *-----------------------------------------------------------------------------*/ |
| 70 | int fixed_mdio_set_link_update(struct phy_device* phydev, |
| 71 | int(*link_update)(struct net_device*, struct fixed_phy_status*)) |
| 72 | { |
| 73 | struct fixed_info *fixed; |
| 74 | |
| 75 | if(link_update == NULL) |
| 76 | return -EINVAL; |
| 77 | |
| 78 | if(phydev) { |
| 79 | if(phydev->bus) { |
| 80 | fixed = phydev->bus->priv; |
| 81 | fixed->link_update = link_update; |
| 82 | return 0; |
| 83 | } |
| 84 | } |
| 85 | return -EINVAL; |
| 86 | } |
| 87 | EXPORT_SYMBOL(fixed_mdio_set_link_update); |
| 88 | |
| 89 | /*----------------------------------------------------------------------------- |
| 90 | * This is used for updating internal mii regs from the status |
| 91 | *-----------------------------------------------------------------------------*/ |
| 92 | static int fixed_mdio_update_regs(struct fixed_info *fixed) |
| 93 | { |
| 94 | u16 *regs = fixed->regs; |
| 95 | u16 bmsr = 0; |
| 96 | u16 bmcr = 0; |
| 97 | |
| 98 | if(!regs) { |
| 99 | printk(KERN_ERR "%s: regs not set up", __FUNCTION__); |
| 100 | return -EINVAL; |
| 101 | } |
| 102 | |
| 103 | if(fixed->phy_status.link) |
| 104 | bmsr |= BMSR_LSTATUS; |
| 105 | |
| 106 | if(fixed->phy_status.duplex) { |
| 107 | bmcr |= BMCR_FULLDPLX; |
| 108 | |
| 109 | switch ( fixed->phy_status.speed ) { |
| 110 | case 100: |
| 111 | bmsr |= BMSR_100FULL; |
| 112 | bmcr |= BMCR_SPEED100; |
| 113 | break; |
| 114 | |
| 115 | case 10: |
| 116 | bmsr |= BMSR_10FULL; |
| 117 | break; |
| 118 | } |
| 119 | } else { |
| 120 | switch ( fixed->phy_status.speed ) { |
| 121 | case 100: |
| 122 | bmsr |= BMSR_100HALF; |
| 123 | bmcr |= BMCR_SPEED100; |
| 124 | break; |
| 125 | |
| 126 | case 10: |
| 127 | bmsr |= BMSR_100HALF; |
| 128 | break; |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | regs[MII_BMCR] = bmcr; |
| 133 | regs[MII_BMSR] = bmsr | 0x800; /*we are always capable of 10 hdx*/ |
| 134 | |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | static int fixed_mii_read(struct mii_bus *bus, int phy_id, int location) |
| 139 | { |
| 140 | struct fixed_info *fixed = bus->priv; |
| 141 | |
| 142 | /* if user has registered link update callback, use it */ |
| 143 | if(fixed->phydev) |
| 144 | if(fixed->phydev->attached_dev) { |
| 145 | if(fixed->link_update) { |
| 146 | fixed->link_update(fixed->phydev->attached_dev, |
| 147 | &fixed->phy_status); |
| 148 | fixed_mdio_update_regs(fixed); |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | if ((unsigned int)location >= fixed->regs_num) |
| 153 | return -1; |
| 154 | return fixed->regs[location]; |
| 155 | } |
| 156 | |
| 157 | static int fixed_mii_write(struct mii_bus *bus, int phy_id, int location, u16 val) |
| 158 | { |
| 159 | /* do nothing for now*/ |
| 160 | return 0; |
| 161 | } |
| 162 | |
| 163 | static int fixed_mii_reset(struct mii_bus *bus) |
| 164 | { |
| 165 | /*nothing here - no way/need to reset it*/ |
| 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | static int fixed_config_aneg(struct phy_device *phydev) |
| 170 | { |
| 171 | /* :TODO:03/13/2006 09:45:37 PM:: |
| 172 | The full autoneg funcionality can be emulated, |
| 173 | but no need to have anything here for now |
| 174 | */ |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | /*----------------------------------------------------------------------------- |
| 179 | * the manual bind will do the magic - with phy_id_mask == 0 |
| 180 | * match will never return true... |
| 181 | *-----------------------------------------------------------------------------*/ |
| 182 | static struct phy_driver fixed_mdio_driver = { |
| 183 | .name = "Fixed PHY", |
| 184 | .features = PHY_BASIC_FEATURES, |
| 185 | .config_aneg = fixed_config_aneg, |
| 186 | .read_status = genphy_read_status, |
| 187 | .driver = { .owner = THIS_MODULE,}, |
| 188 | }; |
| 189 | |
| 190 | /*----------------------------------------------------------------------------- |
| 191 | * This func is used to create all the necessary stuff, bind |
| 192 | * the fixed phy driver and register all it on the mdio_bus_type. |
| 193 | * speed is either 10 or 100, duplex is boolean. |
| 194 | * number is used to create multiple fixed PHYs, so that several devices can |
| 195 | * utilize them simultaneously. |
| 196 | *-----------------------------------------------------------------------------*/ |
| 197 | static int fixed_mdio_register_device(int number, int speed, int duplex) |
| 198 | { |
| 199 | struct mii_bus *new_bus; |
| 200 | struct fixed_info *fixed; |
| 201 | struct phy_device *phydev; |
| 202 | int err = 0; |
| 203 | |
| 204 | struct device* dev = kzalloc(sizeof(struct device), GFP_KERNEL); |
| 205 | |
| 206 | if (NULL == dev) |
| 207 | return -ENOMEM; |
| 208 | |
| 209 | new_bus = kzalloc(sizeof(struct mii_bus), GFP_KERNEL); |
| 210 | |
| 211 | if (NULL == new_bus) { |
| 212 | kfree(dev); |
| 213 | return -ENOMEM; |
| 214 | } |
| 215 | fixed = kzalloc(sizeof(struct fixed_info), GFP_KERNEL); |
| 216 | |
| 217 | if (NULL == fixed) { |
| 218 | kfree(dev); |
| 219 | kfree(new_bus); |
| 220 | return -ENOMEM; |
| 221 | } |
| 222 | |
| 223 | fixed->regs = kzalloc(MII_REGS_NUM*sizeof(int), GFP_KERNEL); |
| 224 | fixed->regs_num = MII_REGS_NUM; |
| 225 | fixed->phy_status.speed = speed; |
| 226 | fixed->phy_status.duplex = duplex; |
| 227 | fixed->phy_status.link = 1; |
| 228 | |
| 229 | new_bus->name = "Fixed MII Bus", |
| 230 | new_bus->read = &fixed_mii_read, |
| 231 | new_bus->write = &fixed_mii_write, |
| 232 | new_bus->reset = &fixed_mii_reset, |
| 233 | |
| 234 | /*set up workspace*/ |
| 235 | fixed_mdio_update_regs(fixed); |
| 236 | new_bus->priv = fixed; |
| 237 | |
| 238 | new_bus->dev = dev; |
| 239 | dev_set_drvdata(dev, new_bus); |
| 240 | |
| 241 | /* create phy_device and register it on the mdio bus */ |
| 242 | phydev = phy_device_create(new_bus, 0, 0); |
| 243 | |
| 244 | /* |
| 245 | Put the phydev pointer into the fixed pack so that bus read/write code could |
| 246 | be able to access for instance attached netdev. Well it doesn't have to do |
| 247 | so, only in case of utilizing user-specified link-update... |
| 248 | */ |
| 249 | fixed->phydev = phydev; |
| 250 | |
| 251 | if(NULL == phydev) { |
| 252 | err = -ENOMEM; |
| 253 | goto device_create_fail; |
| 254 | } |
| 255 | |
Andy Fleming | a9b1497 | 2006-10-19 19:52:26 -0500 | [diff] [blame] | 256 | phydev->irq = PHY_IGNORE_INTERRUPT; |
Vitaly Bordug | 11b0bac | 2006-08-14 23:00:29 -0700 | [diff] [blame] | 257 | phydev->dev.bus = &mdio_bus_type; |
| 258 | |
| 259 | if(number) |
| 260 | snprintf(phydev->dev.bus_id, BUS_ID_SIZE, |
| 261 | "fixed_%d@%d:%d", number, speed, duplex); |
| 262 | else |
| 263 | snprintf(phydev->dev.bus_id, BUS_ID_SIZE, |
| 264 | "fixed@%d:%d", speed, duplex); |
| 265 | phydev->bus = new_bus; |
| 266 | |
| 267 | err = device_register(&phydev->dev); |
| 268 | if(err) { |
| 269 | printk(KERN_ERR "Phy %s failed to register\n", |
| 270 | phydev->dev.bus_id); |
| 271 | goto bus_register_fail; |
| 272 | } |
| 273 | |
| 274 | /* |
| 275 | the mdio bus has phy_id match... In order not to do it |
| 276 | artificially, we are binding the driver here by hand; |
| 277 | it will be the same for all the fixed phys anyway. |
| 278 | */ |
| 279 | down_write(&phydev->dev.bus->subsys.rwsem); |
| 280 | |
| 281 | phydev->dev.driver = &fixed_mdio_driver.driver; |
| 282 | |
| 283 | err = phydev->dev.driver->probe(&phydev->dev); |
| 284 | if(err < 0) { |
| 285 | printk(KERN_ERR "Phy %s: problems with fixed driver\n",phydev->dev.bus_id); |
| 286 | up_write(&phydev->dev.bus->subsys.rwsem); |
| 287 | goto probe_fail; |
| 288 | } |
| 289 | |
Jeff Garzik | b7a00ec | 2006-10-01 07:27:46 -0400 | [diff] [blame] | 290 | err = device_bind_driver(&phydev->dev); |
| 291 | |
Vitaly Bordug | 11b0bac | 2006-08-14 23:00:29 -0700 | [diff] [blame] | 292 | up_write(&phydev->dev.bus->subsys.rwsem); |
| 293 | |
Jeff Garzik | b7a00ec | 2006-10-01 07:27:46 -0400 | [diff] [blame] | 294 | if (err) |
| 295 | goto probe_fail; |
| 296 | |
Vitaly Bordug | 11b0bac | 2006-08-14 23:00:29 -0700 | [diff] [blame] | 297 | return 0; |
| 298 | |
| 299 | probe_fail: |
| 300 | device_unregister(&phydev->dev); |
| 301 | bus_register_fail: |
| 302 | kfree(phydev); |
| 303 | device_create_fail: |
| 304 | kfree(dev); |
| 305 | kfree(new_bus); |
| 306 | kfree(fixed); |
| 307 | |
| 308 | return err; |
| 309 | } |
| 310 | |
| 311 | |
| 312 | MODULE_DESCRIPTION("Fixed PHY device & driver for PAL"); |
| 313 | MODULE_AUTHOR("Vitaly Bordug"); |
| 314 | MODULE_LICENSE("GPL"); |
| 315 | |
| 316 | static int __init fixed_init(void) |
| 317 | { |
Jeff Garzik | c233289 | 2006-09-13 14:33:12 -0400 | [diff] [blame] | 318 | #if 0 |
Vitaly Bordug | 11b0bac | 2006-08-14 23:00:29 -0700 | [diff] [blame] | 319 | int ret; |
| 320 | int duplex = 0; |
Jeff Garzik | c233289 | 2006-09-13 14:33:12 -0400 | [diff] [blame] | 321 | #endif |
Vitaly Bordug | 11b0bac | 2006-08-14 23:00:29 -0700 | [diff] [blame] | 322 | |
| 323 | /* register on the bus... Not expected to be matched with anything there... */ |
| 324 | phy_driver_register(&fixed_mdio_driver); |
| 325 | |
| 326 | /* So let the fun begin... |
| 327 | We will create several mdio devices here, and will bound the upper |
| 328 | driver to them. |
| 329 | |
| 330 | Then the external software can lookup the phy bus by searching |
| 331 | fixed@speed:duplex, e.g. fixed@100:1, to be connected to the |
| 332 | virtual 100M Fdx phy. |
| 333 | |
| 334 | In case several virtual PHYs required, the bus_id will be in form |
| 335 | fixed_<num>@<speed>:<duplex>, which make it able even to define |
| 336 | driver-specific link control callback, if for instance PHY is completely |
| 337 | SW-driven. |
| 338 | |
| 339 | */ |
| 340 | |
| 341 | #ifdef CONFIG_FIXED_MII_DUPLEX |
Jeff Garzik | c233289 | 2006-09-13 14:33:12 -0400 | [diff] [blame] | 342 | #if 0 |
Vitaly Bordug | 11b0bac | 2006-08-14 23:00:29 -0700 | [diff] [blame] | 343 | duplex = 1; |
| 344 | #endif |
Jeff Garzik | c233289 | 2006-09-13 14:33:12 -0400 | [diff] [blame] | 345 | #endif |
Vitaly Bordug | 11b0bac | 2006-08-14 23:00:29 -0700 | [diff] [blame] | 346 | |
| 347 | #ifdef CONFIG_FIXED_MII_100_FDX |
| 348 | fixed_mdio_register_device(0, 100, 1); |
| 349 | #endif |
| 350 | |
Vitaly Bordug | b1f54ba | 2007-01-27 00:00:04 -0800 | [diff] [blame] | 351 | #ifdef CONFIG_FIXED_MII_10_FDX |
Vitaly Bordug | 11b0bac | 2006-08-14 23:00:29 -0700 | [diff] [blame] | 352 | fixed_mdio_register_device(0, 10, 1); |
| 353 | #endif |
| 354 | return 0; |
| 355 | } |
| 356 | |
| 357 | static void __exit fixed_exit(void) |
| 358 | { |
| 359 | phy_driver_unregister(&fixed_mdio_driver); |
| 360 | /* :WARNING:02/18/2006 04:32:40 AM:: Cleanup all the created stuff */ |
| 361 | } |
| 362 | |
| 363 | module_init(fixed_init); |
| 364 | module_exit(fixed_exit); |