1 /* 2 * (C) Copyright 2009 Industrie Dial Face S.p.A. 3 * Luigi 'Comio' Mantellini <luigi.mantellini@idf-hit.com> 4 * 5 * (C) Copyright 2001 6 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com. 7 * 8 * See file CREDITS for list of people who contributed to this 9 * project. 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License as 13 * published by the Free Software Foundation; either version 2 of 14 * the License, or (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 24 * MA 02111-1307 USA 25 */ 26 27 /* 28 * This provides a bit-banged interface to the ethernet MII management 29 * channel. 30 */ 31 32 #include <common.h> 33 #include <ioports.h> 34 #include <ppc_asm.tmpl> 35 #include <miiphy.h> 36 37 #define BB_MII_RELOCATE(v,off) (v += (v?off:0)) 38 39 DECLARE_GLOBAL_DATA_PTR; 40 41 #ifndef CONFIG_BITBANGMII_MULTI 42 43 /* 44 * If CONFIG_BITBANGMII_MULTI is not defined we use a 45 * compatibility layer with the previous miiphybb implementation 46 * based on macros usage. 47 * 48 */ 49 static int bb_mii_init_wrap(struct bb_miiphy_bus *bus) 50 { 51 #ifdef MII_INIT 52 MII_INIT; 53 #endif 54 return 0; 55 } 56 57 static int bb_mdio_active_wrap(struct bb_miiphy_bus *bus) 58 { 59 #ifdef MDIO_DECLARE 60 MDIO_DECLARE; 61 #endif 62 MDIO_ACTIVE; 63 return 0; 64 } 65 66 static int bb_mdio_tristate_wrap(struct bb_miiphy_bus *bus) 67 { 68 #ifdef MDIO_DECLARE 69 MDIO_DECLARE; 70 #endif 71 MDIO_TRISTATE; 72 return 0; 73 } 74 75 static int bb_set_mdio_wrap(struct bb_miiphy_bus *bus, int v) 76 { 77 #ifdef MDIO_DECLARE 78 MDIO_DECLARE; 79 #endif 80 MDIO(v); 81 return 0; 82 } 83 84 static int bb_get_mdio_wrap(struct bb_miiphy_bus *bus, int *v) 85 { 86 #ifdef MDIO_DECLARE 87 MDIO_DECLARE; 88 #endif 89 *v = MDIO_READ; 90 return 0; 91 } 92 93 static int bb_set_mdc_wrap(struct bb_miiphy_bus *bus, int v) 94 { 95 #ifdef MDC_DECLARE 96 MDC_DECLARE; 97 #endif 98 MDC(v); 99 return 0; 100 } 101 102 static int bb_delay_wrap(struct bb_miiphy_bus *bus) 103 { 104 MIIDELAY; 105 return 0; 106 } 107 108 struct bb_miiphy_bus bb_miiphy_buses[] = { 109 { 110 .name = BB_MII_DEVNAME, 111 .init = bb_mii_init_wrap, 112 .mdio_active = bb_mdio_active_wrap, 113 .mdio_tristate = bb_mdio_tristate_wrap, 114 .set_mdio = bb_set_mdio_wrap, 115 .get_mdio = bb_get_mdio_wrap, 116 .set_mdc = bb_set_mdc_wrap, 117 .delay = bb_delay_wrap, 118 } 119 }; 120 121 int bb_miiphy_buses_num = sizeof(bb_miiphy_buses) / 122 sizeof(bb_miiphy_buses[0]); 123 #endif 124 125 void bb_miiphy_init(void) 126 { 127 int i; 128 129 for (i = 0; i < bb_miiphy_buses_num; i++) { 130 #if !defined(CONFIG_RELOC_FIXUP_WORKS) 131 /* Relocate the hook pointers*/ 132 BB_MII_RELOCATE(bb_miiphy_buses[i].init, gd->reloc_off); 133 BB_MII_RELOCATE(bb_miiphy_buses[i].mdio_active, gd->reloc_off); 134 BB_MII_RELOCATE(bb_miiphy_buses[i].mdio_tristate, gd->reloc_off); 135 BB_MII_RELOCATE(bb_miiphy_buses[i].set_mdio, gd->reloc_off); 136 BB_MII_RELOCATE(bb_miiphy_buses[i].get_mdio, gd->reloc_off); 137 BB_MII_RELOCATE(bb_miiphy_buses[i].set_mdc, gd->reloc_off); 138 BB_MII_RELOCATE(bb_miiphy_buses[i].delay, gd->reloc_off); 139 #endif 140 if (bb_miiphy_buses[i].init != NULL) { 141 bb_miiphy_buses[i].init(&bb_miiphy_buses[i]); 142 } 143 } 144 } 145 146 static inline struct bb_miiphy_bus *bb_miiphy_getbus(char *devname) 147 { 148 #ifdef CONFIG_BITBANGMII_MULTI 149 int i; 150 151 /* Search the correct bus */ 152 for (i = 0; i < bb_miiphy_buses_num; i++) { 153 if (!strcmp(bb_miiphy_buses[i].name, devname)) { 154 return &bb_miiphy_buses[i]; 155 } 156 } 157 return NULL; 158 #else 159 /* We have just one bitbanging bus */ 160 return &bb_miiphy_buses[0]; 161 #endif 162 } 163 164 /***************************************************************************** 165 * 166 * Utility to send the preamble, address, and register (common to read 167 * and write). 168 */ 169 static void miiphy_pre(struct bb_miiphy_bus *bus, char read, 170 unsigned char addr, unsigned char reg) 171 { 172 int j; 173 174 /* 175 * Send a 32 bit preamble ('1's) with an extra '1' bit for good measure. 176 * The IEEE spec says this is a PHY optional requirement. The AMD 177 * 79C874 requires one after power up and one after a MII communications 178 * error. This means that we are doing more preambles than we need, 179 * but it is safer and will be much more robust. 180 */ 181 182 bus->mdio_active(bus); 183 bus->set_mdio(bus, 1); 184 for (j = 0; j < 32; j++) { 185 bus->set_mdc(bus, 0); 186 bus->delay(bus); 187 bus->set_mdc(bus, 1); 188 bus->delay(bus); 189 } 190 191 /* send the start bit (01) and the read opcode (10) or write (10) */ 192 bus->set_mdc(bus, 0); 193 bus->set_mdio(bus, 0); 194 bus->delay(bus); 195 bus->set_mdc(bus, 1); 196 bus->delay(bus); 197 bus->set_mdc(bus, 0); 198 bus->set_mdio(bus, 1); 199 bus->delay(bus); 200 bus->set_mdc(bus, 1); 201 bus->delay(bus); 202 bus->set_mdc(bus, 0); 203 bus->set_mdio(bus, read); 204 bus->delay(bus); 205 bus->set_mdc(bus, 1); 206 bus->delay(bus); 207 bus->set_mdc(bus, 0); 208 bus->set_mdio(bus, !read); 209 bus->delay(bus); 210 bus->set_mdc(bus, 1); 211 bus->delay(bus); 212 213 /* send the PHY address */ 214 for (j = 0; j < 5; j++) { 215 bus->set_mdc(bus, 0); 216 if ((addr & 0x10) == 0) { 217 bus->set_mdio(bus, 0); 218 } else { 219 bus->set_mdio(bus, 1); 220 } 221 bus->delay(bus); 222 bus->set_mdc(bus, 1); 223 bus->delay(bus); 224 addr <<= 1; 225 } 226 227 /* send the register address */ 228 for (j = 0; j < 5; j++) { 229 bus->set_mdc(bus, 0); 230 if ((reg & 0x10) == 0) { 231 bus->set_mdio(bus, 0); 232 } else { 233 bus->set_mdio(bus, 1); 234 } 235 bus->delay(bus); 236 bus->set_mdc(bus, 1); 237 bus->delay(bus); 238 reg <<= 1; 239 } 240 } 241 242 /***************************************************************************** 243 * 244 * Read a MII PHY register. 245 * 246 * Returns: 247 * 0 on success 248 */ 249 int bb_miiphy_read(char *devname, unsigned char addr, 250 unsigned char reg, unsigned short *value) 251 { 252 short rdreg; /* register working value */ 253 int v; 254 int j; /* counter */ 255 struct bb_miiphy_bus *bus; 256 257 bus = bb_miiphy_getbus(devname); 258 if (bus == NULL) { 259 return -1; 260 } 261 262 if (value == NULL) { 263 puts("NULL value pointer\n"); 264 return -1; 265 } 266 267 miiphy_pre (bus, 1, addr, reg); 268 269 /* tri-state our MDIO I/O pin so we can read */ 270 bus->set_mdc(bus, 0); 271 bus->mdio_tristate(bus); 272 bus->delay(bus); 273 bus->set_mdc(bus, 1); 274 bus->delay(bus); 275 276 /* check the turnaround bit: the PHY should be driving it to zero */ 277 bus->get_mdio(bus, &v); 278 if (v != 0) { 279 /* puts ("PHY didn't drive TA low\n"); */ 280 for (j = 0; j < 32; j++) { 281 bus->set_mdc(bus, 0); 282 bus->delay(bus); 283 bus->set_mdc(bus, 1); 284 bus->delay(bus); 285 } 286 /* There is no PHY, set value to 0xFFFF and return */ 287 *value = 0xFFFF; 288 return -1; 289 } 290 291 bus->set_mdc(bus, 0); 292 bus->delay(bus); 293 294 /* read 16 bits of register data, MSB first */ 295 rdreg = 0; 296 for (j = 0; j < 16; j++) { 297 bus->set_mdc(bus, 1); 298 bus->delay(bus); 299 rdreg <<= 1; 300 bus->get_mdio(bus, &v); 301 rdreg |= (v & 0x1); 302 bus->set_mdc(bus, 0); 303 bus->delay(bus); 304 } 305 306 bus->set_mdc(bus, 1); 307 bus->delay(bus); 308 bus->set_mdc(bus, 0); 309 bus->delay(bus); 310 bus->set_mdc(bus, 1); 311 bus->delay(bus); 312 313 *value = rdreg; 314 315 #ifdef DEBUG 316 printf ("miiphy_read(0x%x) @ 0x%x = 0x%04x\n", reg, addr, *value); 317 #endif 318 319 return 0; 320 } 321 322 323 /***************************************************************************** 324 * 325 * Write a MII PHY register. 326 * 327 * Returns: 328 * 0 on success 329 */ 330 int bb_miiphy_write (char *devname, unsigned char addr, 331 unsigned char reg, unsigned short value) 332 { 333 struct bb_miiphy_bus *bus; 334 int j; /* counter */ 335 336 bus = bb_miiphy_getbus(devname); 337 if (bus == NULL) { 338 /* Bus not found! */ 339 return -1; 340 } 341 342 miiphy_pre (bus, 0, addr, reg); 343 344 /* send the turnaround (10) */ 345 bus->set_mdc(bus, 0); 346 bus->set_mdio(bus, 1); 347 bus->delay(bus); 348 bus->set_mdc(bus, 1); 349 bus->delay(bus); 350 bus->set_mdc(bus, 0); 351 bus->set_mdio(bus, 0); 352 bus->delay(bus); 353 bus->set_mdc(bus, 1); 354 bus->delay(bus); 355 356 /* write 16 bits of register data, MSB first */ 357 for (j = 0; j < 16; j++) { 358 bus->set_mdc(bus, 0); 359 if ((value & 0x00008000) == 0) { 360 bus->set_mdio(bus, 0); 361 } else { 362 bus->set_mdio(bus, 1); 363 } 364 bus->delay(bus); 365 bus->set_mdc(bus, 1); 366 bus->delay(bus); 367 value <<= 1; 368 } 369 370 /* 371 * Tri-state the MDIO line. 372 */ 373 bus->mdio_tristate(bus); 374 bus->set_mdc(bus, 0); 375 bus->delay(bus); 376 bus->set_mdc(bus, 1); 377 bus->delay(bus); 378 379 return 0; 380 } 381