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/init.h> 24 #include <linux/delay.h> 25 #include <linux/netdevice.h> 26 #include <linux/etherdevice.h> 27 #include <linux/skbuff.h> 28 #include <linux/spinlock.h> 29 #include <linux/mii.h> 30 #include <linux/ethtool.h> 31 #include <linux/bitops.h> 32 #include <linux/fs.h> 33 #include <linux/platform_device.h> 34 #include <linux/of_device.h> 35 #include <linux/gfp.h> 36 37 #include <asm/irq.h> 38 #include <asm/uaccess.h> 39 40 #ifdef CONFIG_8xx 41 #include <asm/8xx_immap.h> 42 #include <asm/pgtable.h> 43 #include <asm/mpc8xx.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 = of_irq_to_resource(ofdev->dev.of_node, 0, NULL); 102 if (fep->interrupt == NO_IRQ) 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_RX_EVENT_MSK (FEC_ENET_RXF | FEC_ENET_RXB) 113 #define FEC_RX_EVENT (FEC_ENET_RXF) 114 #define FEC_TX_EVENT (FEC_ENET_TXF) 115 #define FEC_ERR_EVENT_MSK (FEC_ENET_HBERR | FEC_ENET_BABR | \ 116 FEC_ENET_BABT | FEC_ENET_EBERR) 117 118 static int setup_data(struct net_device *dev) 119 { 120 struct fs_enet_private *fep = netdev_priv(dev); 121 122 if (do_pd_setup(fep) != 0) 123 return -EINVAL; 124 125 fep->fec.hthi = 0; 126 fep->fec.htlo = 0; 127 128 fep->ev_napi_rx = FEC_NAPI_RX_EVENT_MSK; 129 fep->ev_rx = FEC_RX_EVENT; 130 fep->ev_tx = FEC_TX_EVENT; 131 fep->ev_err = FEC_ERR_EVENT_MSK; 132 133 return 0; 134 } 135 136 static int allocate_bd(struct net_device *dev) 137 { 138 struct fs_enet_private *fep = netdev_priv(dev); 139 const struct fs_platform_info *fpi = fep->fpi; 140 141 fep->ring_base = (void __force __iomem *)dma_alloc_coherent(fep->dev, 142 (fpi->tx_ring + fpi->rx_ring) * 143 sizeof(cbd_t), &fep->ring_mem_addr, 144 GFP_KERNEL); 145 if (fep->ring_base == NULL) 146 return -ENOMEM; 147 148 return 0; 149 } 150 151 static void free_bd(struct net_device *dev) 152 { 153 struct fs_enet_private *fep = netdev_priv(dev); 154 const struct fs_platform_info *fpi = fep->fpi; 155 156 if(fep->ring_base) 157 dma_free_coherent(fep->dev, (fpi->tx_ring + fpi->rx_ring) 158 * sizeof(cbd_t), 159 (void __force *)fep->ring_base, 160 fep->ring_mem_addr); 161 } 162 163 static void cleanup_data(struct net_device *dev) 164 { 165 /* nothing */ 166 } 167 168 static void set_promiscuous_mode(struct net_device *dev) 169 { 170 struct fs_enet_private *fep = netdev_priv(dev); 171 struct fec __iomem *fecp = fep->fec.fecp; 172 173 FS(fecp, r_cntrl, FEC_RCNTRL_PROM); 174 } 175 176 static void set_multicast_start(struct net_device *dev) 177 { 178 struct fs_enet_private *fep = netdev_priv(dev); 179 180 fep->fec.hthi = 0; 181 fep->fec.htlo = 0; 182 } 183 184 static void set_multicast_one(struct net_device *dev, const u8 *mac) 185 { 186 struct fs_enet_private *fep = netdev_priv(dev); 187 int temp, hash_index, i, j; 188 u32 crc, csrVal; 189 u8 byte, msb; 190 191 crc = 0xffffffff; 192 for (i = 0; i < 6; i++) { 193 byte = mac[i]; 194 for (j = 0; j < 8; j++) { 195 msb = crc >> 31; 196 crc <<= 1; 197 if (msb ^ (byte & 0x1)) 198 crc ^= FEC_CRC_POLY; 199 byte >>= 1; 200 } 201 } 202 203 temp = (crc & 0x3f) >> 1; 204 hash_index = ((temp & 0x01) << 4) | 205 ((temp & 0x02) << 2) | 206 ((temp & 0x04)) | 207 ((temp & 0x08) >> 2) | 208 ((temp & 0x10) >> 4); 209 csrVal = 1 << hash_index; 210 if (crc & 1) 211 fep->fec.hthi |= csrVal; 212 else 213 fep->fec.htlo |= csrVal; 214 } 215 216 static void set_multicast_finish(struct net_device *dev) 217 { 218 struct fs_enet_private *fep = netdev_priv(dev); 219 struct fec __iomem *fecp = fep->fec.fecp; 220 221 /* if all multi or too many multicasts; just enable all */ 222 if ((dev->flags & IFF_ALLMULTI) != 0 || 223 netdev_mc_count(dev) > FEC_MAX_MULTICAST_ADDRS) { 224 fep->fec.hthi = 0xffffffffU; 225 fep->fec.htlo = 0xffffffffU; 226 } 227 228 FC(fecp, r_cntrl, FEC_RCNTRL_PROM); 229 FW(fecp, grp_hash_table_high, fep->fec.hthi); 230 FW(fecp, grp_hash_table_low, fep->fec.htlo); 231 } 232 233 static void set_multicast_list(struct net_device *dev) 234 { 235 struct netdev_hw_addr *ha; 236 237 if ((dev->flags & IFF_PROMISC) == 0) { 238 set_multicast_start(dev); 239 netdev_for_each_mc_addr(ha, dev) 240 set_multicast_one(dev, ha->addr); 241 set_multicast_finish(dev); 242 } else 243 set_promiscuous_mode(dev); 244 } 245 246 static void restart(struct net_device *dev) 247 { 248 struct fs_enet_private *fep = netdev_priv(dev); 249 struct fec __iomem *fecp = fep->fec.fecp; 250 const struct fs_platform_info *fpi = fep->fpi; 251 dma_addr_t rx_bd_base_phys, tx_bd_base_phys; 252 int r; 253 u32 addrhi, addrlo; 254 255 struct mii_bus* mii = fep->phydev->bus; 256 struct fec_info* fec_inf = mii->priv; 257 258 r = whack_reset(fep->fec.fecp); 259 if (r != 0) 260 dev_err(fep->dev, "FEC Reset FAILED!\n"); 261 /* 262 * Set station address. 263 */ 264 addrhi = ((u32) dev->dev_addr[0] << 24) | 265 ((u32) dev->dev_addr[1] << 16) | 266 ((u32) dev->dev_addr[2] << 8) | 267 (u32) dev->dev_addr[3]; 268 addrlo = ((u32) dev->dev_addr[4] << 24) | 269 ((u32) dev->dev_addr[5] << 16); 270 FW(fecp, addr_low, addrhi); 271 FW(fecp, addr_high, addrlo); 272 273 /* 274 * Reset all multicast. 275 */ 276 FW(fecp, grp_hash_table_high, fep->fec.hthi); 277 FW(fecp, grp_hash_table_low, fep->fec.htlo); 278 279 /* 280 * Set maximum receive buffer size. 281 */ 282 FW(fecp, r_buff_size, PKT_MAXBLR_SIZE); 283 #ifdef CONFIG_FS_ENET_MPC5121_FEC 284 FW(fecp, r_cntrl, PKT_MAXBUF_SIZE << 16); 285 #else 286 FW(fecp, r_hash, PKT_MAXBUF_SIZE); 287 #endif 288 289 /* get physical address */ 290 rx_bd_base_phys = fep->ring_mem_addr; 291 tx_bd_base_phys = rx_bd_base_phys + sizeof(cbd_t) * fpi->rx_ring; 292 293 /* 294 * Set receive and transmit descriptor base. 295 */ 296 FW(fecp, r_des_start, rx_bd_base_phys); 297 FW(fecp, x_des_start, tx_bd_base_phys); 298 299 fs_init_bds(dev); 300 301 /* 302 * Enable big endian and don't care about SDMA FC. 303 */ 304 #ifdef CONFIG_FS_ENET_MPC5121_FEC 305 FS(fecp, dma_control, 0xC0000000); 306 #else 307 FW(fecp, fun_code, 0x78000000); 308 #endif 309 310 /* 311 * Set MII speed. 312 */ 313 FW(fecp, mii_speed, fec_inf->mii_speed); 314 315 /* 316 * Clear any outstanding interrupt. 317 */ 318 FW(fecp, ievent, 0xffc0); 319 #ifndef CONFIG_FS_ENET_MPC5121_FEC 320 FW(fecp, ivec, (virq_to_hw(fep->interrupt) / 2) << 29); 321 322 FW(fecp, r_cntrl, FEC_RCNTRL_MII_MODE); /* MII enable */ 323 #else 324 /* 325 * Only set MII mode - do not touch maximum frame length 326 * configured before. 327 */ 328 FS(fecp, r_cntrl, FEC_RCNTRL_MII_MODE); 329 #endif 330 /* 331 * adjust to duplex mode 332 */ 333 if (fep->phydev->duplex) { 334 FC(fecp, r_cntrl, FEC_RCNTRL_DRT); 335 FS(fecp, x_cntrl, FEC_TCNTRL_FDEN); /* FD enable */ 336 } else { 337 FS(fecp, r_cntrl, FEC_RCNTRL_DRT); 338 FC(fecp, x_cntrl, FEC_TCNTRL_FDEN); /* FD disable */ 339 } 340 341 /* 342 * Enable interrupts we wish to service. 343 */ 344 FW(fecp, imask, FEC_ENET_TXF | FEC_ENET_TXB | 345 FEC_ENET_RXF | FEC_ENET_RXB); 346 347 /* 348 * And last, enable the transmit and receive processing. 349 */ 350 FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN); 351 FW(fecp, r_des_active, 0x01000000); 352 } 353 354 static void stop(struct net_device *dev) 355 { 356 struct fs_enet_private *fep = netdev_priv(dev); 357 const struct fs_platform_info *fpi = fep->fpi; 358 struct fec __iomem *fecp = fep->fec.fecp; 359 360 struct fec_info* feci= fep->phydev->bus->priv; 361 362 int i; 363 364 if ((FR(fecp, ecntrl) & FEC_ECNTRL_ETHER_EN) == 0) 365 return; /* already down */ 366 367 FW(fecp, x_cntrl, 0x01); /* Graceful transmit stop */ 368 for (i = 0; ((FR(fecp, ievent) & 0x10000000) == 0) && 369 i < FEC_RESET_DELAY; i++) 370 udelay(1); 371 372 if (i == FEC_RESET_DELAY) 373 dev_warn(fep->dev, "FEC timeout on graceful transmit stop\n"); 374 /* 375 * Disable FEC. Let only MII interrupts. 376 */ 377 FW(fecp, imask, 0); 378 FC(fecp, ecntrl, FEC_ECNTRL_ETHER_EN); 379 380 fs_cleanup_bds(dev); 381 382 /* shut down FEC1? that's where the mii bus is */ 383 if (fpi->has_phy) { 384 FS(fecp, r_cntrl, FEC_RCNTRL_MII_MODE); /* MII enable */ 385 FS(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN); 386 FW(fecp, ievent, FEC_ENET_MII); 387 FW(fecp, mii_speed, feci->mii_speed); 388 } 389 } 390 391 static void napi_clear_rx_event(struct net_device *dev) 392 { 393 struct fs_enet_private *fep = netdev_priv(dev); 394 struct fec __iomem *fecp = fep->fec.fecp; 395 396 FW(fecp, ievent, FEC_NAPI_RX_EVENT_MSK); 397 } 398 399 static void napi_enable_rx(struct net_device *dev) 400 { 401 struct fs_enet_private *fep = netdev_priv(dev); 402 struct fec __iomem *fecp = fep->fec.fecp; 403 404 FS(fecp, imask, FEC_NAPI_RX_EVENT_MSK); 405 } 406 407 static void napi_disable_rx(struct net_device *dev) 408 { 409 struct fs_enet_private *fep = netdev_priv(dev); 410 struct fec __iomem *fecp = fep->fec.fecp; 411 412 FC(fecp, imask, FEC_NAPI_RX_EVENT_MSK); 413 } 414 415 static void rx_bd_done(struct net_device *dev) 416 { 417 struct fs_enet_private *fep = netdev_priv(dev); 418 struct fec __iomem *fecp = fep->fec.fecp; 419 420 FW(fecp, r_des_active, 0x01000000); 421 } 422 423 static void tx_kickstart(struct net_device *dev) 424 { 425 struct fs_enet_private *fep = netdev_priv(dev); 426 struct fec __iomem *fecp = fep->fec.fecp; 427 428 FW(fecp, x_des_active, 0x01000000); 429 } 430 431 static u32 get_int_events(struct net_device *dev) 432 { 433 struct fs_enet_private *fep = netdev_priv(dev); 434 struct fec __iomem *fecp = fep->fec.fecp; 435 436 return FR(fecp, ievent) & FR(fecp, imask); 437 } 438 439 static void clear_int_events(struct net_device *dev, u32 int_events) 440 { 441 struct fs_enet_private *fep = netdev_priv(dev); 442 struct fec __iomem *fecp = fep->fec.fecp; 443 444 FW(fecp, ievent, int_events); 445 } 446 447 static void ev_error(struct net_device *dev, u32 int_events) 448 { 449 struct fs_enet_private *fep = netdev_priv(dev); 450 451 dev_warn(fep->dev, "FEC ERROR(s) 0x%x\n", int_events); 452 } 453 454 static int get_regs(struct net_device *dev, void *p, int *sizep) 455 { 456 struct fs_enet_private *fep = netdev_priv(dev); 457 458 if (*sizep < sizeof(struct fec)) 459 return -EINVAL; 460 461 memcpy_fromio(p, fep->fec.fecp, sizeof(struct fec)); 462 463 return 0; 464 } 465 466 static int get_regs_len(struct net_device *dev) 467 { 468 return sizeof(struct fec); 469 } 470 471 static void tx_restart(struct net_device *dev) 472 { 473 /* nothing */ 474 } 475 476 /*************************************************************************/ 477 478 const struct fs_ops fs_fec_ops = { 479 .setup_data = setup_data, 480 .cleanup_data = cleanup_data, 481 .set_multicast_list = set_multicast_list, 482 .restart = restart, 483 .stop = stop, 484 .napi_clear_rx_event = napi_clear_rx_event, 485 .napi_enable_rx = napi_enable_rx, 486 .napi_disable_rx = napi_disable_rx, 487 .rx_bd_done = rx_bd_done, 488 .tx_kickstart = tx_kickstart, 489 .get_int_events = get_int_events, 490 .clear_int_events = clear_int_events, 491 .ev_error = ev_error, 492 .get_regs = get_regs, 493 .get_regs_len = get_regs_len, 494 .tx_restart = tx_restart, 495 .allocate_bd = allocate_bd, 496 .free_bd = free_bd, 497 }; 498 499