1 /* 2 * Copyright (C) 2005-2006 Atmel Corporation 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17 */ 18 #include <common.h> 19 20 #if defined(CONFIG_MACB) \ 21 && (defined(CONFIG_CMD_NET) || defined(CONFIG_CMD_MII)) 22 23 /* 24 * The u-boot networking stack is a little weird. It seems like the 25 * networking core allocates receive buffers up front without any 26 * regard to the hardware that's supposed to actually receive those 27 * packets. 28 * 29 * The MACB receives packets into 128-byte receive buffers, so the 30 * buffers allocated by the core isn't very practical to use. We'll 31 * allocate our own, but we need one such buffer in case a packet 32 * wraps around the DMA ring so that we have to copy it. 33 * 34 * Therefore, define CFG_RX_ETH_BUFFER to 1 in the board-specific 35 * configuration header. This way, the core allocates one RX buffer 36 * and one TX buffer, each of which can hold a ethernet packet of 37 * maximum size. 38 * 39 * For some reason, the networking core unconditionally specifies a 40 * 32-byte packet "alignment" (which really should be called 41 * "padding"). MACB shouldn't need that, but we'll refrain from any 42 * core modifications here... 43 */ 44 45 #include <net.h> 46 #include <malloc.h> 47 48 #include <linux/mii.h> 49 #include <asm/io.h> 50 #include <asm/dma-mapping.h> 51 #include <asm/arch/clk.h> 52 53 #include "macb.h" 54 55 #define barrier() asm volatile("" ::: "memory") 56 57 #define CFG_MACB_RX_BUFFER_SIZE 4096 58 #define CFG_MACB_RX_RING_SIZE (CFG_MACB_RX_BUFFER_SIZE / 128) 59 #define CFG_MACB_TX_RING_SIZE 16 60 #define CFG_MACB_TX_TIMEOUT 1000 61 #define CFG_MACB_AUTONEG_TIMEOUT 5000000 62 63 struct macb_dma_desc { 64 u32 addr; 65 u32 ctrl; 66 }; 67 68 #define RXADDR_USED 0x00000001 69 #define RXADDR_WRAP 0x00000002 70 71 #define RXBUF_FRMLEN_MASK 0x00000fff 72 #define RXBUF_FRAME_START 0x00004000 73 #define RXBUF_FRAME_END 0x00008000 74 #define RXBUF_TYPEID_MATCH 0x00400000 75 #define RXBUF_ADDR4_MATCH 0x00800000 76 #define RXBUF_ADDR3_MATCH 0x01000000 77 #define RXBUF_ADDR2_MATCH 0x02000000 78 #define RXBUF_ADDR1_MATCH 0x04000000 79 #define RXBUF_BROADCAST 0x80000000 80 81 #define TXBUF_FRMLEN_MASK 0x000007ff 82 #define TXBUF_FRAME_END 0x00008000 83 #define TXBUF_NOCRC 0x00010000 84 #define TXBUF_EXHAUSTED 0x08000000 85 #define TXBUF_UNDERRUN 0x10000000 86 #define TXBUF_MAXRETRY 0x20000000 87 #define TXBUF_WRAP 0x40000000 88 #define TXBUF_USED 0x80000000 89 90 struct macb_device { 91 void *regs; 92 93 unsigned int rx_tail; 94 unsigned int tx_head; 95 unsigned int tx_tail; 96 97 void *rx_buffer; 98 void *tx_buffer; 99 struct macb_dma_desc *rx_ring; 100 struct macb_dma_desc *tx_ring; 101 102 unsigned long rx_buffer_dma; 103 unsigned long rx_ring_dma; 104 unsigned long tx_ring_dma; 105 106 const struct device *dev; 107 struct eth_device netdev; 108 unsigned short phy_addr; 109 }; 110 #define to_macb(_nd) container_of(_nd, struct macb_device, netdev) 111 112 static void macb_mdio_write(struct macb_device *macb, u8 reg, u16 value) 113 { 114 unsigned long netctl; 115 unsigned long netstat; 116 unsigned long frame; 117 118 netctl = macb_readl(macb, NCR); 119 netctl |= MACB_BIT(MPE); 120 macb_writel(macb, NCR, netctl); 121 122 frame = (MACB_BF(SOF, 1) 123 | MACB_BF(RW, 1) 124 | MACB_BF(PHYA, macb->phy_addr) 125 | MACB_BF(REGA, reg) 126 | MACB_BF(CODE, 2) 127 | MACB_BF(DATA, value)); 128 macb_writel(macb, MAN, frame); 129 130 do { 131 netstat = macb_readl(macb, NSR); 132 } while (!(netstat & MACB_BIT(IDLE))); 133 134 netctl = macb_readl(macb, NCR); 135 netctl &= ~MACB_BIT(MPE); 136 macb_writel(macb, NCR, netctl); 137 } 138 139 static u16 macb_mdio_read(struct macb_device *macb, u8 reg) 140 { 141 unsigned long netctl; 142 unsigned long netstat; 143 unsigned long frame; 144 145 netctl = macb_readl(macb, NCR); 146 netctl |= MACB_BIT(MPE); 147 macb_writel(macb, NCR, netctl); 148 149 frame = (MACB_BF(SOF, 1) 150 | MACB_BF(RW, 2) 151 | MACB_BF(PHYA, macb->phy_addr) 152 | MACB_BF(REGA, reg) 153 | MACB_BF(CODE, 2)); 154 macb_writel(macb, MAN, frame); 155 156 do { 157 netstat = macb_readl(macb, NSR); 158 } while (!(netstat & MACB_BIT(IDLE))); 159 160 frame = macb_readl(macb, MAN); 161 162 netctl = macb_readl(macb, NCR); 163 netctl &= ~MACB_BIT(MPE); 164 macb_writel(macb, NCR, netctl); 165 166 return MACB_BFEXT(DATA, frame); 167 } 168 169 #if defined(CONFIG_CMD_NET) 170 171 static int macb_send(struct eth_device *netdev, volatile void *packet, 172 int length) 173 { 174 struct macb_device *macb = to_macb(netdev); 175 unsigned long paddr, ctrl; 176 unsigned int tx_head = macb->tx_head; 177 int i; 178 179 paddr = dma_map_single(packet, length, DMA_TO_DEVICE); 180 181 ctrl = length & TXBUF_FRMLEN_MASK; 182 ctrl |= TXBUF_FRAME_END; 183 if (tx_head == (CFG_MACB_TX_RING_SIZE - 1)) { 184 ctrl |= TXBUF_WRAP; 185 macb->tx_head = 0; 186 } else 187 macb->tx_head++; 188 189 macb->tx_ring[tx_head].ctrl = ctrl; 190 macb->tx_ring[tx_head].addr = paddr; 191 barrier(); 192 macb_writel(macb, NCR, MACB_BIT(TE) | MACB_BIT(RE) | MACB_BIT(TSTART)); 193 194 /* 195 * I guess this is necessary because the networking core may 196 * re-use the transmit buffer as soon as we return... 197 */ 198 for (i = 0; i <= CFG_MACB_TX_TIMEOUT; i++) { 199 barrier(); 200 ctrl = macb->tx_ring[tx_head].ctrl; 201 if (ctrl & TXBUF_USED) 202 break; 203 udelay(1); 204 } 205 206 dma_unmap_single(packet, length, paddr); 207 208 if (i <= CFG_MACB_TX_TIMEOUT) { 209 if (ctrl & TXBUF_UNDERRUN) 210 printf("%s: TX underrun\n", netdev->name); 211 if (ctrl & TXBUF_EXHAUSTED) 212 printf("%s: TX buffers exhausted in mid frame\n", 213 netdev->name); 214 } else { 215 printf("%s: TX timeout\n", netdev->name); 216 } 217 218 /* No one cares anyway */ 219 return 0; 220 } 221 222 static void reclaim_rx_buffers(struct macb_device *macb, 223 unsigned int new_tail) 224 { 225 unsigned int i; 226 227 i = macb->rx_tail; 228 while (i > new_tail) { 229 macb->rx_ring[i].addr &= ~RXADDR_USED; 230 i++; 231 if (i > CFG_MACB_RX_RING_SIZE) 232 i = 0; 233 } 234 235 while (i < new_tail) { 236 macb->rx_ring[i].addr &= ~RXADDR_USED; 237 i++; 238 } 239 240 barrier(); 241 macb->rx_tail = new_tail; 242 } 243 244 static int macb_recv(struct eth_device *netdev) 245 { 246 struct macb_device *macb = to_macb(netdev); 247 unsigned int rx_tail = macb->rx_tail; 248 void *buffer; 249 int length; 250 int wrapped = 0; 251 u32 status; 252 253 for (;;) { 254 if (!(macb->rx_ring[rx_tail].addr & RXADDR_USED)) 255 return -1; 256 257 status = macb->rx_ring[rx_tail].ctrl; 258 if (status & RXBUF_FRAME_START) { 259 if (rx_tail != macb->rx_tail) 260 reclaim_rx_buffers(macb, rx_tail); 261 wrapped = 0; 262 } 263 264 if (status & RXBUF_FRAME_END) { 265 buffer = macb->rx_buffer + 128 * macb->rx_tail; 266 length = status & RXBUF_FRMLEN_MASK; 267 if (wrapped) { 268 unsigned int headlen, taillen; 269 270 headlen = 128 * (CFG_MACB_RX_RING_SIZE 271 - macb->rx_tail); 272 taillen = length - headlen; 273 memcpy((void *)NetRxPackets[0], 274 buffer, headlen); 275 memcpy((void *)NetRxPackets[0] + headlen, 276 macb->rx_buffer, taillen); 277 buffer = (void *)NetRxPackets[0]; 278 } 279 280 NetReceive(buffer, length); 281 if (++rx_tail >= CFG_MACB_RX_RING_SIZE) 282 rx_tail = 0; 283 reclaim_rx_buffers(macb, rx_tail); 284 } else { 285 if (++rx_tail >= CFG_MACB_RX_RING_SIZE) { 286 wrapped = 1; 287 rx_tail = 0; 288 } 289 } 290 barrier(); 291 } 292 293 return 0; 294 } 295 296 static void macb_phy_reset(struct macb_device *macb) 297 { 298 struct eth_device *netdev = &macb->netdev; 299 int i; 300 u16 status, adv; 301 302 adv = ADVERTISE_CSMA | ADVERTISE_ALL; 303 macb_mdio_write(macb, MII_ADVERTISE, adv); 304 printf("%s: Starting autonegotiation...\n", netdev->name); 305 macb_mdio_write(macb, MII_BMCR, (BMCR_ANENABLE 306 | BMCR_ANRESTART)); 307 308 for (i = 0; i < CFG_MACB_AUTONEG_TIMEOUT / 100; i++) { 309 status = macb_mdio_read(macb, MII_BMSR); 310 if (status & BMSR_ANEGCOMPLETE) 311 break; 312 udelay(100); 313 } 314 315 if (status & BMSR_ANEGCOMPLETE) 316 printf("%s: Autonegotiation complete\n", netdev->name); 317 else 318 printf("%s: Autonegotiation timed out (status=0x%04x)\n", 319 netdev->name, status); 320 } 321 322 static int macb_phy_init(struct macb_device *macb) 323 { 324 struct eth_device *netdev = &macb->netdev; 325 u32 ncfgr; 326 u16 phy_id, status, adv, lpa; 327 int media, speed, duplex; 328 int i; 329 330 /* Check if the PHY is up to snuff... */ 331 phy_id = macb_mdio_read(macb, MII_PHYSID1); 332 if (phy_id == 0xffff) { 333 printf("%s: No PHY present\n", netdev->name); 334 return 0; 335 } 336 337 status = macb_mdio_read(macb, MII_BMSR); 338 if (!(status & BMSR_LSTATUS)) { 339 /* Try to re-negotiate if we don't have link already. */ 340 macb_phy_reset(macb); 341 342 for (i = 0; i < CFG_MACB_AUTONEG_TIMEOUT / 100; i++) { 343 status = macb_mdio_read(macb, MII_BMSR); 344 if (status & BMSR_LSTATUS) 345 break; 346 udelay(100); 347 } 348 } 349 350 if (!(status & BMSR_LSTATUS)) { 351 printf("%s: link down (status: 0x%04x)\n", 352 netdev->name, status); 353 return 0; 354 } else { 355 adv = macb_mdio_read(macb, MII_ADVERTISE); 356 lpa = macb_mdio_read(macb, MII_LPA); 357 media = mii_nway_result(lpa & adv); 358 speed = (media & (ADVERTISE_100FULL | ADVERTISE_100HALF) 359 ? 1 : 0); 360 duplex = (media & ADVERTISE_FULL) ? 1 : 0; 361 printf("%s: link up, %sMbps %s-duplex (lpa: 0x%04x)\n", 362 netdev->name, 363 speed ? "100" : "10", 364 duplex ? "full" : "half", 365 lpa); 366 367 ncfgr = macb_readl(macb, NCFGR); 368 ncfgr &= ~(MACB_BIT(SPD) | MACB_BIT(FD)); 369 if (speed) 370 ncfgr |= MACB_BIT(SPD); 371 if (duplex) 372 ncfgr |= MACB_BIT(FD); 373 macb_writel(macb, NCFGR, ncfgr); 374 return 1; 375 } 376 } 377 378 static int macb_init(struct eth_device *netdev, bd_t *bd) 379 { 380 struct macb_device *macb = to_macb(netdev); 381 unsigned long paddr; 382 u32 hwaddr_bottom; 383 u16 hwaddr_top; 384 int i; 385 386 /* 387 * macb_halt should have been called at some point before now, 388 * so we'll assume the controller is idle. 389 */ 390 391 /* initialize DMA descriptors */ 392 paddr = macb->rx_buffer_dma; 393 for (i = 0; i < CFG_MACB_RX_RING_SIZE; i++) { 394 if (i == (CFG_MACB_RX_RING_SIZE - 1)) 395 paddr |= RXADDR_WRAP; 396 macb->rx_ring[i].addr = paddr; 397 macb->rx_ring[i].ctrl = 0; 398 paddr += 128; 399 } 400 for (i = 0; i < CFG_MACB_TX_RING_SIZE; i++) { 401 macb->tx_ring[i].addr = 0; 402 if (i == (CFG_MACB_TX_RING_SIZE - 1)) 403 macb->tx_ring[i].ctrl = TXBUF_USED | TXBUF_WRAP; 404 else 405 macb->tx_ring[i].ctrl = TXBUF_USED; 406 } 407 macb->rx_tail = macb->tx_head = macb->tx_tail = 0; 408 409 macb_writel(macb, RBQP, macb->rx_ring_dma); 410 macb_writel(macb, TBQP, macb->tx_ring_dma); 411 412 /* set hardware address */ 413 hwaddr_bottom = cpu_to_le32(*((u32 *)netdev->enetaddr)); 414 macb_writel(macb, SA1B, hwaddr_bottom); 415 hwaddr_top = cpu_to_le16(*((u16 *)(netdev->enetaddr + 4))); 416 macb_writel(macb, SA1T, hwaddr_top); 417 418 /* choose RMII or MII mode. This depends on the board */ 419 #ifdef CONFIG_RMII 420 macb_writel(macb, USRIO, 0); 421 #else 422 macb_writel(macb, USRIO, MACB_BIT(MII)); 423 #endif 424 425 if (!macb_phy_init(macb)) 426 return 0; 427 428 /* Enable TX and RX */ 429 macb_writel(macb, NCR, MACB_BIT(TE) | MACB_BIT(RE)); 430 431 return 1; 432 } 433 434 static void macb_halt(struct eth_device *netdev) 435 { 436 struct macb_device *macb = to_macb(netdev); 437 u32 ncr, tsr; 438 439 /* Halt the controller and wait for any ongoing transmission to end. */ 440 ncr = macb_readl(macb, NCR); 441 ncr |= MACB_BIT(THALT); 442 macb_writel(macb, NCR, ncr); 443 444 do { 445 tsr = macb_readl(macb, TSR); 446 } while (tsr & MACB_BIT(TGO)); 447 448 /* Disable TX and RX, and clear statistics */ 449 macb_writel(macb, NCR, MACB_BIT(CLRSTAT)); 450 } 451 452 int macb_eth_initialize(int id, void *regs, unsigned int phy_addr) 453 { 454 struct macb_device *macb; 455 struct eth_device *netdev; 456 unsigned long macb_hz; 457 u32 ncfgr; 458 459 macb = malloc(sizeof(struct macb_device)); 460 if (!macb) { 461 printf("Error: Failed to allocate memory for MACB%d\n", id); 462 return -1; 463 } 464 memset(macb, 0, sizeof(struct macb_device)); 465 466 netdev = &macb->netdev; 467 468 macb->rx_buffer = dma_alloc_coherent(CFG_MACB_RX_BUFFER_SIZE, 469 &macb->rx_buffer_dma); 470 macb->rx_ring = dma_alloc_coherent(CFG_MACB_RX_RING_SIZE 471 * sizeof(struct macb_dma_desc), 472 &macb->rx_ring_dma); 473 macb->tx_ring = dma_alloc_coherent(CFG_MACB_TX_RING_SIZE 474 * sizeof(struct macb_dma_desc), 475 &macb->tx_ring_dma); 476 477 macb->regs = regs; 478 macb->phy_addr = phy_addr; 479 480 sprintf(netdev->name, "macb%d", id); 481 netdev->init = macb_init; 482 netdev->halt = macb_halt; 483 netdev->send = macb_send; 484 netdev->recv = macb_recv; 485 486 /* 487 * Do some basic initialization so that we at least can talk 488 * to the PHY 489 */ 490 macb_hz = get_macb_pclk_rate(id); 491 if (macb_hz < 20000000) 492 ncfgr = MACB_BF(CLK, MACB_CLK_DIV8); 493 else if (macb_hz < 40000000) 494 ncfgr = MACB_BF(CLK, MACB_CLK_DIV16); 495 else if (macb_hz < 80000000) 496 ncfgr = MACB_BF(CLK, MACB_CLK_DIV32); 497 else 498 ncfgr = MACB_BF(CLK, MACB_CLK_DIV64); 499 500 macb_writel(macb, NCFGR, ncfgr); 501 502 eth_register(netdev); 503 504 return 0; 505 } 506 507 #endif 508 509 #if defined(CONFIG_CMD_MII) 510 511 int miiphy_read(unsigned char addr, unsigned char reg, unsigned short *value) 512 { 513 unsigned long netctl; 514 unsigned long netstat; 515 unsigned long frame; 516 int iflag; 517 518 iflag = disable_interrupts(); 519 netctl = macb_readl(&macb, EMACB_NCR); 520 netctl |= MACB_BIT(MPE); 521 macb_writel(&macb, EMACB_NCR, netctl); 522 if (iflag) 523 enable_interrupts(); 524 525 frame = (MACB_BF(SOF, 1) 526 | MACB_BF(RW, 2) 527 | MACB_BF(PHYA, addr) 528 | MACB_BF(REGA, reg) 529 | MACB_BF(CODE, 2)); 530 macb_writel(&macb, EMACB_MAN, frame); 531 532 do { 533 netstat = macb_readl(&macb, EMACB_NSR); 534 } while (!(netstat & MACB_BIT(IDLE))); 535 536 frame = macb_readl(&macb, EMACB_MAN); 537 *value = MACB_BFEXT(DATA, frame); 538 539 iflag = disable_interrupts(); 540 netctl = macb_readl(&macb, EMACB_NCR); 541 netctl &= ~MACB_BIT(MPE); 542 macb_writel(&macb, EMACB_NCR, netctl); 543 if (iflag) 544 enable_interrupts(); 545 546 return 0; 547 } 548 549 int miiphy_write(unsigned char addr, unsigned char reg, unsigned short value) 550 { 551 unsigned long netctl; 552 unsigned long netstat; 553 unsigned long frame; 554 int iflag; 555 556 iflag = disable_interrupts(); 557 netctl = macb_readl(&macb, EMACB_NCR); 558 netctl |= MACB_BIT(MPE); 559 macb_writel(&macb, EMACB_NCR, netctl); 560 if (iflag) 561 enable_interrupts(); 562 563 frame = (MACB_BF(SOF, 1) 564 | MACB_BF(RW, 1) 565 | MACB_BF(PHYA, addr) 566 | MACB_BF(REGA, reg) 567 | MACB_BF(CODE, 2) 568 | MACB_BF(DATA, value)); 569 macb_writel(&macb, EMACB_MAN, frame); 570 571 do { 572 netstat = macb_readl(&macb, EMACB_NSR); 573 } while (!(netstat & MACB_BIT(IDLE))); 574 575 iflag = disable_interrupts(); 576 netctl = macb_readl(&macb, EMACB_NCR); 577 netctl &= ~MACB_BIT(MPE); 578 macb_writel(&macb, EMACB_NCR, netctl); 579 if (iflag) 580 enable_interrupts(); 581 582 return 0; 583 } 584 585 #endif 586 587 #endif /* CONFIG_MACB */ 588