1 /* 2 * (C) Copyright 2011 Michal Simek 3 * 4 * Michal SIMEK <monstr@monstr.eu> 5 * 6 * Based on Xilinx gmac driver: 7 * (C) Copyright 2011 Xilinx 8 * 9 * SPDX-License-Identifier: GPL-2.0+ 10 */ 11 12 #include <common.h> 13 #include <net.h> 14 #include <netdev.h> 15 #include <config.h> 16 #include <fdtdec.h> 17 #include <libfdt.h> 18 #include <malloc.h> 19 #include <asm/io.h> 20 #include <phy.h> 21 #include <miiphy.h> 22 #include <watchdog.h> 23 #include <asm/arch/hardware.h> 24 #include <asm/arch/sys_proto.h> 25 26 #if !defined(CONFIG_PHYLIB) 27 # error XILINX_GEM_ETHERNET requires PHYLIB 28 #endif 29 30 /* Bit/mask specification */ 31 #define ZYNQ_GEM_PHYMNTNC_OP_MASK 0x40020000 /* operation mask bits */ 32 #define ZYNQ_GEM_PHYMNTNC_OP_R_MASK 0x20000000 /* read operation */ 33 #define ZYNQ_GEM_PHYMNTNC_OP_W_MASK 0x10000000 /* write operation */ 34 #define ZYNQ_GEM_PHYMNTNC_PHYAD_SHIFT_MASK 23 /* Shift bits for PHYAD */ 35 #define ZYNQ_GEM_PHYMNTNC_PHREG_SHIFT_MASK 18 /* Shift bits for PHREG */ 36 37 #define ZYNQ_GEM_RXBUF_EOF_MASK 0x00008000 /* End of frame. */ 38 #define ZYNQ_GEM_RXBUF_SOF_MASK 0x00004000 /* Start of frame. */ 39 #define ZYNQ_GEM_RXBUF_LEN_MASK 0x00003FFF /* Mask for length field */ 40 41 #define ZYNQ_GEM_RXBUF_WRAP_MASK 0x00000002 /* Wrap bit, last BD */ 42 #define ZYNQ_GEM_RXBUF_NEW_MASK 0x00000001 /* Used bit.. */ 43 #define ZYNQ_GEM_RXBUF_ADD_MASK 0xFFFFFFFC /* Mask for address */ 44 45 /* Wrap bit, last descriptor */ 46 #define ZYNQ_GEM_TXBUF_WRAP_MASK 0x40000000 47 #define ZYNQ_GEM_TXBUF_LAST_MASK 0x00008000 /* Last buffer */ 48 49 #define ZYNQ_GEM_NWCTRL_TXEN_MASK 0x00000008 /* Enable transmit */ 50 #define ZYNQ_GEM_NWCTRL_RXEN_MASK 0x00000004 /* Enable receive */ 51 #define ZYNQ_GEM_NWCTRL_MDEN_MASK 0x00000010 /* Enable MDIO port */ 52 #define ZYNQ_GEM_NWCTRL_STARTTX_MASK 0x00000200 /* Start tx (tx_go) */ 53 54 #define ZYNQ_GEM_NWCFG_SPEED100 0x000000001 /* 100 Mbps operation */ 55 #define ZYNQ_GEM_NWCFG_SPEED1000 0x000000400 /* 1Gbps operation */ 56 #define ZYNQ_GEM_NWCFG_FDEN 0x000000002 /* Full Duplex mode */ 57 #define ZYNQ_GEM_NWCFG_FSREM 0x000020000 /* FCS removal */ 58 #define ZYNQ_GEM_NWCFG_MDCCLKDIV 0x000080000 /* Div pclk by 32, 80MHz */ 59 #define ZYNQ_GEM_NWCFG_MDCCLKDIV2 0x0000c0000 /* Div pclk by 48, 120MHz */ 60 61 #define ZYNQ_GEM_NWCFG_INIT (ZYNQ_GEM_NWCFG_FDEN | \ 62 ZYNQ_GEM_NWCFG_FSREM | \ 63 ZYNQ_GEM_NWCFG_MDCCLKDIV) 64 65 #define ZYNQ_GEM_NWSR_MDIOIDLE_MASK 0x00000004 /* PHY management idle */ 66 67 #define ZYNQ_GEM_DMACR_BLENGTH 0x00000004 /* INCR4 AHB bursts */ 68 /* Use full configured addressable space (8 Kb) */ 69 #define ZYNQ_GEM_DMACR_RXSIZE 0x00000300 70 /* Use full configured addressable space (4 Kb) */ 71 #define ZYNQ_GEM_DMACR_TXSIZE 0x00000400 72 /* Set with binary 00011000 to use 1536 byte(1*max length frame/buffer) */ 73 #define ZYNQ_GEM_DMACR_RXBUF 0x00180000 74 75 #define ZYNQ_GEM_DMACR_INIT (ZYNQ_GEM_DMACR_BLENGTH | \ 76 ZYNQ_GEM_DMACR_RXSIZE | \ 77 ZYNQ_GEM_DMACR_TXSIZE | \ 78 ZYNQ_GEM_DMACR_RXBUF) 79 80 /* Use MII register 1 (MII status register) to detect PHY */ 81 #define PHY_DETECT_REG 1 82 83 /* Mask used to verify certain PHY features (or register contents) 84 * in the register above: 85 * 0x1000: 10Mbps full duplex support 86 * 0x0800: 10Mbps half duplex support 87 * 0x0008: Auto-negotiation support 88 */ 89 #define PHY_DETECT_MASK 0x1808 90 91 /* TX BD status masks */ 92 #define ZYNQ_GEM_TXBUF_FRMLEN_MASK 0x000007ff 93 #define ZYNQ_GEM_TXBUF_EXHAUSTED 0x08000000 94 #define ZYNQ_GEM_TXBUF_UNDERRUN 0x10000000 95 96 /* Clock frequencies for different speeds */ 97 #define ZYNQ_GEM_FREQUENCY_10 2500000UL 98 #define ZYNQ_GEM_FREQUENCY_100 25000000UL 99 #define ZYNQ_GEM_FREQUENCY_1000 125000000UL 100 101 /* Device registers */ 102 struct zynq_gem_regs { 103 u32 nwctrl; /* Network Control reg */ 104 u32 nwcfg; /* Network Config reg */ 105 u32 nwsr; /* Network Status reg */ 106 u32 reserved1; 107 u32 dmacr; /* DMA Control reg */ 108 u32 txsr; /* TX Status reg */ 109 u32 rxqbase; /* RX Q Base address reg */ 110 u32 txqbase; /* TX Q Base address reg */ 111 u32 rxsr; /* RX Status reg */ 112 u32 reserved2[2]; 113 u32 idr; /* Interrupt Disable reg */ 114 u32 reserved3; 115 u32 phymntnc; /* Phy Maintaince reg */ 116 u32 reserved4[18]; 117 u32 hashl; /* Hash Low address reg */ 118 u32 hashh; /* Hash High address reg */ 119 #define LADDR_LOW 0 120 #define LADDR_HIGH 1 121 u32 laddr[4][LADDR_HIGH + 1]; /* Specific1 addr low/high reg */ 122 u32 match[4]; /* Type ID1 Match reg */ 123 u32 reserved6[18]; 124 u32 stat[44]; /* Octects transmitted Low reg - stat start */ 125 }; 126 127 /* BD descriptors */ 128 struct emac_bd { 129 u32 addr; /* Next descriptor pointer */ 130 u32 status; 131 }; 132 133 #define RX_BUF 3 134 /* Page table entries are set to 1MB, or multiples of 1MB 135 * (not < 1MB). driver uses less bd's so use 1MB bdspace. 136 */ 137 #define BD_SPACE 0x100000 138 /* BD separation space */ 139 #define BD_SEPRN_SPACE 64 140 141 /* Initialized, rxbd_current, rx_first_buf must be 0 after init */ 142 struct zynq_gem_priv { 143 struct emac_bd *tx_bd; 144 struct emac_bd *rx_bd; 145 char *rxbuffers; 146 u32 rxbd_current; 147 u32 rx_first_buf; 148 int phyaddr; 149 u32 emio; 150 int init; 151 struct phy_device *phydev; 152 struct mii_dev *bus; 153 }; 154 155 static inline int mdio_wait(struct eth_device *dev) 156 { 157 struct zynq_gem_regs *regs = (struct zynq_gem_regs *)dev->iobase; 158 u32 timeout = 200; 159 160 /* Wait till MDIO interface is ready to accept a new transaction. */ 161 while (--timeout) { 162 if (readl(®s->nwsr) & ZYNQ_GEM_NWSR_MDIOIDLE_MASK) 163 break; 164 WATCHDOG_RESET(); 165 } 166 167 if (!timeout) { 168 printf("%s: Timeout\n", __func__); 169 return 1; 170 } 171 172 return 0; 173 } 174 175 static u32 phy_setup_op(struct eth_device *dev, u32 phy_addr, u32 regnum, 176 u32 op, u16 *data) 177 { 178 u32 mgtcr; 179 struct zynq_gem_regs *regs = (struct zynq_gem_regs *)dev->iobase; 180 181 if (mdio_wait(dev)) 182 return 1; 183 184 /* Construct mgtcr mask for the operation */ 185 mgtcr = ZYNQ_GEM_PHYMNTNC_OP_MASK | op | 186 (phy_addr << ZYNQ_GEM_PHYMNTNC_PHYAD_SHIFT_MASK) | 187 (regnum << ZYNQ_GEM_PHYMNTNC_PHREG_SHIFT_MASK) | *data; 188 189 /* Write mgtcr and wait for completion */ 190 writel(mgtcr, ®s->phymntnc); 191 192 if (mdio_wait(dev)) 193 return 1; 194 195 if (op == ZYNQ_GEM_PHYMNTNC_OP_R_MASK) 196 *data = readl(®s->phymntnc); 197 198 return 0; 199 } 200 201 static u32 phyread(struct eth_device *dev, u32 phy_addr, u32 regnum, u16 *val) 202 { 203 return phy_setup_op(dev, phy_addr, regnum, 204 ZYNQ_GEM_PHYMNTNC_OP_R_MASK, val); 205 } 206 207 static u32 phywrite(struct eth_device *dev, u32 phy_addr, u32 regnum, u16 data) 208 { 209 return phy_setup_op(dev, phy_addr, regnum, 210 ZYNQ_GEM_PHYMNTNC_OP_W_MASK, &data); 211 } 212 213 static void phy_detection(struct eth_device *dev) 214 { 215 int i; 216 u16 phyreg; 217 struct zynq_gem_priv *priv = dev->priv; 218 219 if (priv->phyaddr != -1) { 220 phyread(dev, priv->phyaddr, PHY_DETECT_REG, &phyreg); 221 if ((phyreg != 0xFFFF) && 222 ((phyreg & PHY_DETECT_MASK) == PHY_DETECT_MASK)) { 223 /* Found a valid PHY address */ 224 debug("Default phy address %d is valid\n", 225 priv->phyaddr); 226 return; 227 } else { 228 debug("PHY address is not setup correctly %d\n", 229 priv->phyaddr); 230 priv->phyaddr = -1; 231 } 232 } 233 234 debug("detecting phy address\n"); 235 if (priv->phyaddr == -1) { 236 /* detect the PHY address */ 237 for (i = 31; i >= 0; i--) { 238 phyread(dev, i, PHY_DETECT_REG, &phyreg); 239 if ((phyreg != 0xFFFF) && 240 ((phyreg & PHY_DETECT_MASK) == PHY_DETECT_MASK)) { 241 /* Found a valid PHY address */ 242 priv->phyaddr = i; 243 debug("Found valid phy address, %d\n", i); 244 return; 245 } 246 } 247 } 248 printf("PHY is not detected\n"); 249 } 250 251 static int zynq_gem_setup_mac(struct eth_device *dev) 252 { 253 u32 i, macaddrlow, macaddrhigh; 254 struct zynq_gem_regs *regs = (struct zynq_gem_regs *)dev->iobase; 255 256 /* Set the MAC bits [31:0] in BOT */ 257 macaddrlow = dev->enetaddr[0]; 258 macaddrlow |= dev->enetaddr[1] << 8; 259 macaddrlow |= dev->enetaddr[2] << 16; 260 macaddrlow |= dev->enetaddr[3] << 24; 261 262 /* Set MAC bits [47:32] in TOP */ 263 macaddrhigh = dev->enetaddr[4]; 264 macaddrhigh |= dev->enetaddr[5] << 8; 265 266 for (i = 0; i < 4; i++) { 267 writel(0, ®s->laddr[i][LADDR_LOW]); 268 writel(0, ®s->laddr[i][LADDR_HIGH]); 269 /* Do not use MATCHx register */ 270 writel(0, ®s->match[i]); 271 } 272 273 writel(macaddrlow, ®s->laddr[0][LADDR_LOW]); 274 writel(macaddrhigh, ®s->laddr[0][LADDR_HIGH]); 275 276 return 0; 277 } 278 279 static int zynq_gem_init(struct eth_device *dev, bd_t * bis) 280 { 281 u32 i; 282 unsigned long clk_rate = 0; 283 struct phy_device *phydev; 284 const u32 stat_size = (sizeof(struct zynq_gem_regs) - 285 offsetof(struct zynq_gem_regs, stat)) / 4; 286 struct zynq_gem_regs *regs = (struct zynq_gem_regs *)dev->iobase; 287 struct zynq_gem_priv *priv = dev->priv; 288 const u32 supported = SUPPORTED_10baseT_Half | 289 SUPPORTED_10baseT_Full | 290 SUPPORTED_100baseT_Half | 291 SUPPORTED_100baseT_Full | 292 SUPPORTED_1000baseT_Half | 293 SUPPORTED_1000baseT_Full; 294 295 if (!priv->init) { 296 /* Disable all interrupts */ 297 writel(0xFFFFFFFF, ®s->idr); 298 299 /* Disable the receiver & transmitter */ 300 writel(0, ®s->nwctrl); 301 writel(0, ®s->txsr); 302 writel(0, ®s->rxsr); 303 writel(0, ®s->phymntnc); 304 305 /* Clear the Hash registers for the mac address 306 * pointed by AddressPtr 307 */ 308 writel(0x0, ®s->hashl); 309 /* Write bits [63:32] in TOP */ 310 writel(0x0, ®s->hashh); 311 312 /* Clear all counters */ 313 for (i = 0; i <= stat_size; i++) 314 readl(®s->stat[i]); 315 316 /* Setup RxBD space */ 317 memset(priv->rx_bd, 0, RX_BUF * sizeof(struct emac_bd)); 318 319 for (i = 0; i < RX_BUF; i++) { 320 priv->rx_bd[i].status = 0xF0000000; 321 priv->rx_bd[i].addr = 322 ((u32)(priv->rxbuffers) + 323 (i * PKTSIZE_ALIGN)); 324 } 325 /* WRAP bit to last BD */ 326 priv->rx_bd[--i].addr |= ZYNQ_GEM_RXBUF_WRAP_MASK; 327 /* Write RxBDs to IP */ 328 writel((u32)priv->rx_bd, ®s->rxqbase); 329 330 /* Setup for DMA Configuration register */ 331 writel(ZYNQ_GEM_DMACR_INIT, ®s->dmacr); 332 333 /* Setup for Network Control register, MDIO, Rx and Tx enable */ 334 setbits_le32(®s->nwctrl, ZYNQ_GEM_NWCTRL_MDEN_MASK); 335 336 priv->init++; 337 } 338 339 phy_detection(dev); 340 341 /* interface - look at tsec */ 342 phydev = phy_connect(priv->bus, priv->phyaddr, dev, 343 PHY_INTERFACE_MODE_MII); 344 345 phydev->supported = supported | ADVERTISED_Pause | 346 ADVERTISED_Asym_Pause; 347 phydev->advertising = phydev->supported; 348 priv->phydev = phydev; 349 phy_config(phydev); 350 phy_startup(phydev); 351 352 if (!phydev->link) { 353 printf("%s: No link.\n", phydev->dev->name); 354 return -1; 355 } 356 357 switch (phydev->speed) { 358 case SPEED_1000: 359 writel(ZYNQ_GEM_NWCFG_INIT | ZYNQ_GEM_NWCFG_SPEED1000, 360 ®s->nwcfg); 361 clk_rate = ZYNQ_GEM_FREQUENCY_1000; 362 break; 363 case SPEED_100: 364 clrsetbits_le32(®s->nwcfg, ZYNQ_GEM_NWCFG_SPEED1000, 365 ZYNQ_GEM_NWCFG_INIT | ZYNQ_GEM_NWCFG_SPEED100); 366 clk_rate = ZYNQ_GEM_FREQUENCY_100; 367 break; 368 case SPEED_10: 369 clk_rate = ZYNQ_GEM_FREQUENCY_10; 370 break; 371 } 372 373 /* Change the rclk and clk only not using EMIO interface */ 374 if (!priv->emio) 375 zynq_slcr_gem_clk_setup(dev->iobase != 376 ZYNQ_GEM_BASEADDR0, clk_rate); 377 378 setbits_le32(®s->nwctrl, ZYNQ_GEM_NWCTRL_RXEN_MASK | 379 ZYNQ_GEM_NWCTRL_TXEN_MASK); 380 381 return 0; 382 } 383 384 static int zynq_gem_send(struct eth_device *dev, void *ptr, int len) 385 { 386 u32 addr, size; 387 struct zynq_gem_priv *priv = dev->priv; 388 struct zynq_gem_regs *regs = (struct zynq_gem_regs *)dev->iobase; 389 390 /* setup BD */ 391 writel((u32)priv->tx_bd, ®s->txqbase); 392 393 /* Setup Tx BD */ 394 memset(priv->tx_bd, 0, sizeof(struct emac_bd)); 395 396 priv->tx_bd->addr = (u32)ptr; 397 priv->tx_bd->status = (len & ZYNQ_GEM_TXBUF_FRMLEN_MASK) | 398 ZYNQ_GEM_TXBUF_LAST_MASK; 399 400 addr = (u32) ptr; 401 addr &= ~(ARCH_DMA_MINALIGN - 1); 402 size = roundup(len, ARCH_DMA_MINALIGN); 403 flush_dcache_range(addr, addr + size); 404 barrier(); 405 406 /* Start transmit */ 407 setbits_le32(®s->nwctrl, ZYNQ_GEM_NWCTRL_STARTTX_MASK); 408 409 /* Read TX BD status */ 410 if (priv->tx_bd->status & ZYNQ_GEM_TXBUF_UNDERRUN) 411 printf("TX underrun\n"); 412 if (priv->tx_bd->status & ZYNQ_GEM_TXBUF_EXHAUSTED) 413 printf("TX buffers exhausted in mid frame\n"); 414 415 return 0; 416 } 417 418 /* Do not check frame_recd flag in rx_status register 0x20 - just poll BD */ 419 static int zynq_gem_recv(struct eth_device *dev) 420 { 421 int frame_len; 422 struct zynq_gem_priv *priv = dev->priv; 423 struct emac_bd *current_bd = &priv->rx_bd[priv->rxbd_current]; 424 struct emac_bd *first_bd; 425 426 if (!(current_bd->addr & ZYNQ_GEM_RXBUF_NEW_MASK)) 427 return 0; 428 429 if (!(current_bd->status & 430 (ZYNQ_GEM_RXBUF_SOF_MASK | ZYNQ_GEM_RXBUF_EOF_MASK))) { 431 printf("GEM: SOF or EOF not set for last buffer received!\n"); 432 return 0; 433 } 434 435 frame_len = current_bd->status & ZYNQ_GEM_RXBUF_LEN_MASK; 436 if (frame_len) { 437 u32 addr = current_bd->addr & ZYNQ_GEM_RXBUF_ADD_MASK; 438 addr &= ~(ARCH_DMA_MINALIGN - 1); 439 u32 size = roundup(frame_len, ARCH_DMA_MINALIGN); 440 invalidate_dcache_range(addr, addr + size); 441 442 NetReceive((u8 *)addr, frame_len); 443 444 if (current_bd->status & ZYNQ_GEM_RXBUF_SOF_MASK) 445 priv->rx_first_buf = priv->rxbd_current; 446 else { 447 current_bd->addr &= ~ZYNQ_GEM_RXBUF_NEW_MASK; 448 current_bd->status = 0xF0000000; /* FIXME */ 449 } 450 451 if (current_bd->status & ZYNQ_GEM_RXBUF_EOF_MASK) { 452 first_bd = &priv->rx_bd[priv->rx_first_buf]; 453 first_bd->addr &= ~ZYNQ_GEM_RXBUF_NEW_MASK; 454 first_bd->status = 0xF0000000; 455 } 456 457 if ((++priv->rxbd_current) >= RX_BUF) 458 priv->rxbd_current = 0; 459 } 460 461 return frame_len; 462 } 463 464 static void zynq_gem_halt(struct eth_device *dev) 465 { 466 struct zynq_gem_regs *regs = (struct zynq_gem_regs *)dev->iobase; 467 468 clrsetbits_le32(®s->nwctrl, ZYNQ_GEM_NWCTRL_RXEN_MASK | 469 ZYNQ_GEM_NWCTRL_TXEN_MASK, 0); 470 } 471 472 static int zynq_gem_miiphyread(const char *devname, uchar addr, 473 uchar reg, ushort *val) 474 { 475 struct eth_device *dev = eth_get_dev(); 476 int ret; 477 478 ret = phyread(dev, addr, reg, val); 479 debug("%s 0x%x, 0x%x, 0x%x\n", __func__, addr, reg, *val); 480 return ret; 481 } 482 483 static int zynq_gem_miiphy_write(const char *devname, uchar addr, 484 uchar reg, ushort val) 485 { 486 struct eth_device *dev = eth_get_dev(); 487 488 debug("%s 0x%x, 0x%x, 0x%x\n", __func__, addr, reg, val); 489 return phywrite(dev, addr, reg, val); 490 } 491 492 int zynq_gem_initialize(bd_t *bis, int base_addr, int phy_addr, u32 emio) 493 { 494 struct eth_device *dev; 495 struct zynq_gem_priv *priv; 496 void *bd_space; 497 498 dev = calloc(1, sizeof(*dev)); 499 if (dev == NULL) 500 return -1; 501 502 dev->priv = calloc(1, sizeof(struct zynq_gem_priv)); 503 if (dev->priv == NULL) { 504 free(dev); 505 return -1; 506 } 507 priv = dev->priv; 508 509 /* Align rxbuffers to ARCH_DMA_MINALIGN */ 510 priv->rxbuffers = memalign(ARCH_DMA_MINALIGN, RX_BUF * PKTSIZE_ALIGN); 511 memset(priv->rxbuffers, 0, RX_BUF * PKTSIZE_ALIGN); 512 513 /* Align bd_space to 1MB */ 514 bd_space = memalign(1 << MMU_SECTION_SHIFT, BD_SPACE); 515 mmu_set_region_dcache_behaviour((u32)bd_space, BD_SPACE, DCACHE_OFF); 516 517 /* Initialize the bd spaces for tx and rx bd's */ 518 priv->tx_bd = (struct emac_bd *)bd_space; 519 priv->rx_bd = (struct emac_bd *)((u32)bd_space + BD_SEPRN_SPACE); 520 521 priv->phyaddr = phy_addr; 522 priv->emio = emio; 523 524 sprintf(dev->name, "Gem.%x", base_addr); 525 526 dev->iobase = base_addr; 527 528 dev->init = zynq_gem_init; 529 dev->halt = zynq_gem_halt; 530 dev->send = zynq_gem_send; 531 dev->recv = zynq_gem_recv; 532 dev->write_hwaddr = zynq_gem_setup_mac; 533 534 eth_register(dev); 535 536 miiphy_register(dev->name, zynq_gem_miiphyread, zynq_gem_miiphy_write); 537 priv->bus = miiphy_get_dev_by_name(dev->name); 538 539 return 1; 540 } 541 542 #ifdef CONFIG_OF_CONTROL 543 int zynq_gem_of_init(const void *blob) 544 { 545 int offset = 0; 546 u32 ret = 0; 547 u32 reg, phy_reg; 548 549 debug("ZYNQ GEM: Initialization\n"); 550 551 do { 552 offset = fdt_node_offset_by_compatible(blob, offset, 553 "xlnx,ps7-ethernet-1.00.a"); 554 if (offset != -1) { 555 reg = fdtdec_get_addr(blob, offset, "reg"); 556 if (reg != FDT_ADDR_T_NONE) { 557 offset = fdtdec_lookup_phandle(blob, offset, 558 "phy-handle"); 559 if (offset != -1) 560 phy_reg = fdtdec_get_addr(blob, offset, 561 "reg"); 562 else 563 phy_reg = 0; 564 565 debug("ZYNQ GEM: addr %x, phyaddr %x\n", 566 reg, phy_reg); 567 568 ret |= zynq_gem_initialize(NULL, reg, 569 phy_reg, 0); 570 571 } else { 572 debug("ZYNQ GEM: Can't get base address\n"); 573 return -1; 574 } 575 } 576 } while (offset != -1); 577 578 return ret; 579 } 580 #endif 581