1 /* 2 * Freescale Ethernet controllers 3 * 4 * Copyright (c) 2005 Intracom S.A. 5 * by Pantelis Antoniou <panto@intracom.gr> 6 * 7 * 2005 (c) MontaVista Software, Inc. 8 * Vitaly Bordug <vbordug@ru.mvista.com> 9 * 10 * This file is licensed under the terms of the GNU General Public License 11 * version 2. This program is licensed "as is" without any warranty of any 12 * kind, whether express or implied. 13 */ 14 15 #include <linux/module.h> 16 #include <linux/kernel.h> 17 #include <linux/types.h> 18 #include <linux/string.h> 19 #include <linux/ptrace.h> 20 #include <linux/errno.h> 21 #include <linux/ioport.h> 22 #include <linux/interrupt.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/mii.h> 29 #include <linux/ethtool.h> 30 #include <linux/bitops.h> 31 #include <linux/fs.h> 32 #include <linux/platform_device.h> 33 #include <linux/of_address.h> 34 #include <linux/of_device.h> 35 #include <linux/of_irq.h> 36 #include <linux/gfp.h> 37 38 #include <asm/irq.h> 39 #include <linux/uaccess.h> 40 41 #ifdef CONFIG_8xx 42 #include <asm/8xx_immap.h> 43 #include <asm/pgtable.h> 44 #include <asm/cpm1.h> 45 #endif 46 47 #include "fs_enet.h" 48 #include "fec.h" 49 50 /*************************************************/ 51 52 #if defined(CONFIG_CPM1) 53 /* for a CPM1 __raw_xxx's are sufficient */ 54 #define __fs_out32(addr, x) __raw_writel(x, addr) 55 #define __fs_out16(addr, x) __raw_writew(x, addr) 56 #define __fs_in32(addr) __raw_readl(addr) 57 #define __fs_in16(addr) __raw_readw(addr) 58 #else 59 /* for others play it safe */ 60 #define __fs_out32(addr, x) out_be32(addr, x) 61 #define __fs_out16(addr, x) out_be16(addr, x) 62 #define __fs_in32(addr) in_be32(addr) 63 #define __fs_in16(addr) in_be16(addr) 64 #endif 65 66 /* write */ 67 #define FW(_fecp, _reg, _v) __fs_out32(&(_fecp)->fec_ ## _reg, (_v)) 68 69 /* read */ 70 #define FR(_fecp, _reg) __fs_in32(&(_fecp)->fec_ ## _reg) 71 72 /* set bits */ 73 #define FS(_fecp, _reg, _v) FW(_fecp, _reg, FR(_fecp, _reg) | (_v)) 74 75 /* clear bits */ 76 #define FC(_fecp, _reg, _v) FW(_fecp, _reg, FR(_fecp, _reg) & ~(_v)) 77 78 /* 79 * Delay to wait for FEC reset command to complete (in us) 80 */ 81 #define FEC_RESET_DELAY 50 82 83 static int whack_reset(struct fec __iomem *fecp) 84 { 85 int i; 86 87 FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_RESET); 88 for (i = 0; i < FEC_RESET_DELAY; i++) { 89 if ((FR(fecp, ecntrl) & FEC_ECNTRL_RESET) == 0) 90 return 0; /* OK */ 91 udelay(1); 92 } 93 94 return -1; 95 } 96 97 static int do_pd_setup(struct fs_enet_private *fep) 98 { 99 struct platform_device *ofdev = to_platform_device(fep->dev); 100 101 fep->interrupt = irq_of_parse_and_map(ofdev->dev.of_node, 0); 102 if (!fep->interrupt) 103 return -EINVAL; 104 105 fep->fec.fecp = of_iomap(ofdev->dev.of_node, 0); 106 if (!fep->fcc.fccp) 107 return -EINVAL; 108 109 return 0; 110 } 111 112 #define FEC_NAPI_EVENT_MSK (FEC_ENET_RXF | FEC_ENET_RXB | FEC_ENET_TXF) 113 #define FEC_EVENT (FEC_ENET_RXF | FEC_ENET_TXF) 114 #define FEC_ERR_EVENT_MSK (FEC_ENET_HBERR | FEC_ENET_BABR | \ 115 FEC_ENET_BABT | FEC_ENET_EBERR) 116 117 static int setup_data(struct net_device *dev) 118 { 119 struct fs_enet_private *fep = netdev_priv(dev); 120 121 if (do_pd_setup(fep) != 0) 122 return -EINVAL; 123 124 fep->fec.hthi = 0; 125 fep->fec.htlo = 0; 126 127 fep->ev_napi = FEC_NAPI_EVENT_MSK; 128 fep->ev = FEC_EVENT; 129 fep->ev_err = FEC_ERR_EVENT_MSK; 130 131 return 0; 132 } 133 134 static int allocate_bd(struct net_device *dev) 135 { 136 struct fs_enet_private *fep = netdev_priv(dev); 137 const struct fs_platform_info *fpi = fep->fpi; 138 139 fep->ring_base = (void __force __iomem *)dma_alloc_coherent(fep->dev, 140 (fpi->tx_ring + fpi->rx_ring) * 141 sizeof(cbd_t), &fep->ring_mem_addr, 142 GFP_KERNEL); 143 if (fep->ring_base == NULL) 144 return -ENOMEM; 145 146 return 0; 147 } 148 149 static void free_bd(struct net_device *dev) 150 { 151 struct fs_enet_private *fep = netdev_priv(dev); 152 const struct fs_platform_info *fpi = fep->fpi; 153 154 if(fep->ring_base) 155 dma_free_coherent(fep->dev, (fpi->tx_ring + fpi->rx_ring) 156 * sizeof(cbd_t), 157 (void __force *)fep->ring_base, 158 fep->ring_mem_addr); 159 } 160 161 static void cleanup_data(struct net_device *dev) 162 { 163 /* nothing */ 164 } 165 166 static void set_promiscuous_mode(struct net_device *dev) 167 { 168 struct fs_enet_private *fep = netdev_priv(dev); 169 struct fec __iomem *fecp = fep->fec.fecp; 170 171 FS(fecp, r_cntrl, FEC_RCNTRL_PROM); 172 } 173 174 static void set_multicast_start(struct net_device *dev) 175 { 176 struct fs_enet_private *fep = netdev_priv(dev); 177 178 fep->fec.hthi = 0; 179 fep->fec.htlo = 0; 180 } 181 182 static void set_multicast_one(struct net_device *dev, const u8 *mac) 183 { 184 struct fs_enet_private *fep = netdev_priv(dev); 185 int temp, hash_index, i, j; 186 u32 crc, csrVal; 187 u8 byte, msb; 188 189 crc = 0xffffffff; 190 for (i = 0; i < 6; i++) { 191 byte = mac[i]; 192 for (j = 0; j < 8; j++) { 193 msb = crc >> 31; 194 crc <<= 1; 195 if (msb ^ (byte & 0x1)) 196 crc ^= FEC_CRC_POLY; 197 byte >>= 1; 198 } 199 } 200 201 temp = (crc & 0x3f) >> 1; 202 hash_index = ((temp & 0x01) << 4) | 203 ((temp & 0x02) << 2) | 204 ((temp & 0x04)) | 205 ((temp & 0x08) >> 2) | 206 ((temp & 0x10) >> 4); 207 csrVal = 1 << hash_index; 208 if (crc & 1) 209 fep->fec.hthi |= csrVal; 210 else 211 fep->fec.htlo |= csrVal; 212 } 213 214 static void set_multicast_finish(struct net_device *dev) 215 { 216 struct fs_enet_private *fep = netdev_priv(dev); 217 struct fec __iomem *fecp = fep->fec.fecp; 218 219 /* if all multi or too many multicasts; just enable all */ 220 if ((dev->flags & IFF_ALLMULTI) != 0 || 221 netdev_mc_count(dev) > FEC_MAX_MULTICAST_ADDRS) { 222 fep->fec.hthi = 0xffffffffU; 223 fep->fec.htlo = 0xffffffffU; 224 } 225 226 FC(fecp, r_cntrl, FEC_RCNTRL_PROM); 227 FW(fecp, grp_hash_table_high, fep->fec.hthi); 228 FW(fecp, grp_hash_table_low, fep->fec.htlo); 229 } 230 231 static void set_multicast_list(struct net_device *dev) 232 { 233 struct netdev_hw_addr *ha; 234 235 if ((dev->flags & IFF_PROMISC) == 0) { 236 set_multicast_start(dev); 237 netdev_for_each_mc_addr(ha, dev) 238 set_multicast_one(dev, ha->addr); 239 set_multicast_finish(dev); 240 } else 241 set_promiscuous_mode(dev); 242 } 243 244 static void restart(struct net_device *dev) 245 { 246 struct fs_enet_private *fep = netdev_priv(dev); 247 struct fec __iomem *fecp = fep->fec.fecp; 248 const struct fs_platform_info *fpi = fep->fpi; 249 dma_addr_t rx_bd_base_phys, tx_bd_base_phys; 250 int r; 251 u32 addrhi, addrlo; 252 253 struct mii_bus *mii = dev->phydev->mdio.bus; 254 struct fec_info* fec_inf = mii->priv; 255 256 r = whack_reset(fep->fec.fecp); 257 if (r != 0) 258 dev_err(fep->dev, "FEC Reset FAILED!\n"); 259 /* 260 * Set station address. 261 */ 262 addrhi = ((u32) dev->dev_addr[0] << 24) | 263 ((u32) dev->dev_addr[1] << 16) | 264 ((u32) dev->dev_addr[2] << 8) | 265 (u32) dev->dev_addr[3]; 266 addrlo = ((u32) dev->dev_addr[4] << 24) | 267 ((u32) dev->dev_addr[5] << 16); 268 FW(fecp, addr_low, addrhi); 269 FW(fecp, addr_high, addrlo); 270 271 /* 272 * Reset all multicast. 273 */ 274 FW(fecp, grp_hash_table_high, fep->fec.hthi); 275 FW(fecp, grp_hash_table_low, fep->fec.htlo); 276 277 /* 278 * Set maximum receive buffer size. 279 */ 280 FW(fecp, r_buff_size, PKT_MAXBLR_SIZE); 281 #ifdef CONFIG_FS_ENET_MPC5121_FEC 282 FW(fecp, r_cntrl, PKT_MAXBUF_SIZE << 16); 283 #else 284 FW(fecp, r_hash, PKT_MAXBUF_SIZE); 285 #endif 286 287 /* get physical address */ 288 rx_bd_base_phys = fep->ring_mem_addr; 289 tx_bd_base_phys = rx_bd_base_phys + sizeof(cbd_t) * fpi->rx_ring; 290 291 /* 292 * Set receive and transmit descriptor base. 293 */ 294 FW(fecp, r_des_start, rx_bd_base_phys); 295 FW(fecp, x_des_start, tx_bd_base_phys); 296 297 fs_init_bds(dev); 298 299 /* 300 * Enable big endian and don't care about SDMA FC. 301 */ 302 #ifdef CONFIG_FS_ENET_MPC5121_FEC 303 FS(fecp, dma_control, 0xC0000000); 304 #else 305 FW(fecp, fun_code, 0x78000000); 306 #endif 307 308 /* 309 * Set MII speed. 310 */ 311 FW(fecp, mii_speed, fec_inf->mii_speed); 312 313 /* 314 * Clear any outstanding interrupt. 315 */ 316 FW(fecp, ievent, 0xffc0); 317 #ifndef CONFIG_FS_ENET_MPC5121_FEC 318 FW(fecp, ivec, (virq_to_hw(fep->interrupt) / 2) << 29); 319 320 FW(fecp, r_cntrl, FEC_RCNTRL_MII_MODE); /* MII enable */ 321 #else 322 /* 323 * Only set MII/RMII mode - do not touch maximum frame length 324 * configured before. 325 */ 326 FS(fecp, r_cntrl, fpi->use_rmii ? 327 FEC_RCNTRL_RMII_MODE : FEC_RCNTRL_MII_MODE); 328 #endif 329 /* 330 * adjust to duplex mode 331 */ 332 if (dev->phydev->duplex) { 333 FC(fecp, r_cntrl, FEC_RCNTRL_DRT); 334 FS(fecp, x_cntrl, FEC_TCNTRL_FDEN); /* FD enable */ 335 } else { 336 FS(fecp, r_cntrl, FEC_RCNTRL_DRT); 337 FC(fecp, x_cntrl, FEC_TCNTRL_FDEN); /* FD disable */ 338 } 339 340 /* Restore multicast and promiscuous settings */ 341 set_multicast_list(dev); 342 343 /* 344 * Enable interrupts we wish to service. 345 */ 346 FW(fecp, imask, FEC_ENET_TXF | FEC_ENET_TXB | 347 FEC_ENET_RXF | FEC_ENET_RXB); 348 349 /* 350 * And last, enable the transmit and receive processing. 351 */ 352 FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN); 353 FW(fecp, r_des_active, 0x01000000); 354 } 355 356 static void stop(struct net_device *dev) 357 { 358 struct fs_enet_private *fep = netdev_priv(dev); 359 const struct fs_platform_info *fpi = fep->fpi; 360 struct fec __iomem *fecp = fep->fec.fecp; 361 362 struct fec_info *feci = dev->phydev->mdio.bus->priv; 363 364 int i; 365 366 if ((FR(fecp, ecntrl) & FEC_ECNTRL_ETHER_EN) == 0) 367 return; /* already down */ 368 369 FW(fecp, x_cntrl, 0x01); /* Graceful transmit stop */ 370 for (i = 0; ((FR(fecp, ievent) & 0x10000000) == 0) && 371 i < FEC_RESET_DELAY; i++) 372 udelay(1); 373 374 if (i == FEC_RESET_DELAY) 375 dev_warn(fep->dev, "FEC timeout on graceful transmit stop\n"); 376 /* 377 * Disable FEC. Let only MII interrupts. 378 */ 379 FW(fecp, imask, 0); 380 FC(fecp, ecntrl, FEC_ECNTRL_ETHER_EN); 381 382 fs_cleanup_bds(dev); 383 384 /* shut down FEC1? that's where the mii bus is */ 385 if (fpi->has_phy) { 386 FS(fecp, r_cntrl, fpi->use_rmii ? 387 FEC_RCNTRL_RMII_MODE : 388 FEC_RCNTRL_MII_MODE); /* MII/RMII enable */ 389 FS(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN); 390 FW(fecp, ievent, FEC_ENET_MII); 391 FW(fecp, mii_speed, feci->mii_speed); 392 } 393 } 394 395 static void napi_clear_event_fs(struct net_device *dev) 396 { 397 struct fs_enet_private *fep = netdev_priv(dev); 398 struct fec __iomem *fecp = fep->fec.fecp; 399 400 FW(fecp, ievent, FEC_NAPI_EVENT_MSK); 401 } 402 403 static void napi_enable_fs(struct net_device *dev) 404 { 405 struct fs_enet_private *fep = netdev_priv(dev); 406 struct fec __iomem *fecp = fep->fec.fecp; 407 408 FS(fecp, imask, FEC_NAPI_EVENT_MSK); 409 } 410 411 static void napi_disable_fs(struct net_device *dev) 412 { 413 struct fs_enet_private *fep = netdev_priv(dev); 414 struct fec __iomem *fecp = fep->fec.fecp; 415 416 FC(fecp, imask, FEC_NAPI_EVENT_MSK); 417 } 418 419 static void rx_bd_done(struct net_device *dev) 420 { 421 struct fs_enet_private *fep = netdev_priv(dev); 422 struct fec __iomem *fecp = fep->fec.fecp; 423 424 FW(fecp, r_des_active, 0x01000000); 425 } 426 427 static void tx_kickstart(struct net_device *dev) 428 { 429 struct fs_enet_private *fep = netdev_priv(dev); 430 struct fec __iomem *fecp = fep->fec.fecp; 431 432 FW(fecp, x_des_active, 0x01000000); 433 } 434 435 static u32 get_int_events(struct net_device *dev) 436 { 437 struct fs_enet_private *fep = netdev_priv(dev); 438 struct fec __iomem *fecp = fep->fec.fecp; 439 440 return FR(fecp, ievent) & FR(fecp, imask); 441 } 442 443 static void clear_int_events(struct net_device *dev, u32 int_events) 444 { 445 struct fs_enet_private *fep = netdev_priv(dev); 446 struct fec __iomem *fecp = fep->fec.fecp; 447 448 FW(fecp, ievent, int_events); 449 } 450 451 static void ev_error(struct net_device *dev, u32 int_events) 452 { 453 struct fs_enet_private *fep = netdev_priv(dev); 454 455 dev_warn(fep->dev, "FEC ERROR(s) 0x%x\n", int_events); 456 } 457 458 static int get_regs(struct net_device *dev, void *p, int *sizep) 459 { 460 struct fs_enet_private *fep = netdev_priv(dev); 461 462 if (*sizep < sizeof(struct fec)) 463 return -EINVAL; 464 465 memcpy_fromio(p, fep->fec.fecp, sizeof(struct fec)); 466 467 return 0; 468 } 469 470 static int get_regs_len(struct net_device *dev) 471 { 472 return sizeof(struct fec); 473 } 474 475 static void tx_restart(struct net_device *dev) 476 { 477 /* nothing */ 478 } 479 480 /*************************************************************************/ 481 482 const struct fs_ops fs_fec_ops = { 483 .setup_data = setup_data, 484 .cleanup_data = cleanup_data, 485 .set_multicast_list = set_multicast_list, 486 .restart = restart, 487 .stop = stop, 488 .napi_clear_event = napi_clear_event_fs, 489 .napi_enable = napi_enable_fs, 490 .napi_disable = napi_disable_fs, 491 .rx_bd_done = rx_bd_done, 492 .tx_kickstart = tx_kickstart, 493 .get_int_events = get_int_events, 494 .clear_int_events = clear_int_events, 495 .ev_error = ev_error, 496 .get_regs = get_regs, 497 .get_regs_len = get_regs_len, 498 .tx_restart = tx_restart, 499 .allocate_bd = allocate_bd, 500 .free_bd = free_bd, 501 }; 502 503