1 /* 2 * Hitachi SCA HD64570 driver for Linux 3 * 4 * Copyright (C) 1998-2003 Krzysztof Halasa <khc@pm.waw.pl> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of version 2 of the GNU General Public License 8 * as published by the Free Software Foundation. 9 * 10 * Source of information: Hitachi HD64570 SCA User's Manual 11 * 12 * We use the following SCA memory map: 13 * 14 * Packet buffer descriptor rings - starting from winbase or win0base: 15 * rx_ring_buffers * sizeof(pkt_desc) = logical channel #0 RX ring 16 * tx_ring_buffers * sizeof(pkt_desc) = logical channel #0 TX ring 17 * rx_ring_buffers * sizeof(pkt_desc) = logical channel #1 RX ring (if used) 18 * tx_ring_buffers * sizeof(pkt_desc) = logical channel #1 TX ring (if used) 19 * 20 * Packet data buffers - starting from winbase + buff_offset: 21 * rx_ring_buffers * HDLC_MAX_MRU = logical channel #0 RX buffers 22 * tx_ring_buffers * HDLC_MAX_MRU = logical channel #0 TX buffers 23 * rx_ring_buffers * HDLC_MAX_MRU = logical channel #0 RX buffers (if used) 24 * tx_ring_buffers * HDLC_MAX_MRU = logical channel #0 TX buffers (if used) 25 */ 26 27 #include <linux/bitops.h> 28 #include <linux/errno.h> 29 #include <linux/fcntl.h> 30 #include <linux/hdlc.h> 31 #include <linux/in.h> 32 #include <linux/interrupt.h> 33 #include <linux/ioport.h> 34 #include <linux/jiffies.h> 35 #include <linux/kernel.h> 36 #include <linux/module.h> 37 #include <linux/netdevice.h> 38 #include <linux/skbuff.h> 39 #include <linux/string.h> 40 #include <linux/types.h> 41 #include <asm/io.h> 42 #include <linux/uaccess.h> 43 #include "hd64570.h" 44 45 #define get_msci(port) (phy_node(port) ? MSCI1_OFFSET : MSCI0_OFFSET) 46 #define get_dmac_rx(port) (phy_node(port) ? DMAC1RX_OFFSET : DMAC0RX_OFFSET) 47 #define get_dmac_tx(port) (phy_node(port) ? DMAC1TX_OFFSET : DMAC0TX_OFFSET) 48 49 #define SCA_INTR_MSCI(node) (node ? 0x10 : 0x01) 50 #define SCA_INTR_DMAC_RX(node) (node ? 0x20 : 0x02) 51 #define SCA_INTR_DMAC_TX(node) (node ? 0x40 : 0x04) 52 53 54 static inline struct net_device *port_to_dev(port_t *port) 55 { 56 return port->dev; 57 } 58 59 static inline int sca_intr_status(card_t *card) 60 { 61 u8 result = 0; 62 u8 isr0 = sca_in(ISR0, card); 63 u8 isr1 = sca_in(ISR1, card); 64 65 if (isr1 & 0x03) result |= SCA_INTR_DMAC_RX(0); 66 if (isr1 & 0x0C) result |= SCA_INTR_DMAC_TX(0); 67 if (isr1 & 0x30) result |= SCA_INTR_DMAC_RX(1); 68 if (isr1 & 0xC0) result |= SCA_INTR_DMAC_TX(1); 69 if (isr0 & 0x0F) result |= SCA_INTR_MSCI(0); 70 if (isr0 & 0xF0) result |= SCA_INTR_MSCI(1); 71 72 if (!(result & SCA_INTR_DMAC_TX(0))) 73 if (sca_in(DSR_TX(0), card) & DSR_EOM) 74 result |= SCA_INTR_DMAC_TX(0); 75 if (!(result & SCA_INTR_DMAC_TX(1))) 76 if (sca_in(DSR_TX(1), card) & DSR_EOM) 77 result |= SCA_INTR_DMAC_TX(1); 78 79 return result; 80 } 81 82 static inline port_t* dev_to_port(struct net_device *dev) 83 { 84 return dev_to_hdlc(dev)->priv; 85 } 86 87 static inline u16 next_desc(port_t *port, u16 desc, int transmit) 88 { 89 return (desc + 1) % (transmit ? port_to_card(port)->tx_ring_buffers 90 : port_to_card(port)->rx_ring_buffers); 91 } 92 93 94 static inline u16 desc_abs_number(port_t *port, u16 desc, int transmit) 95 { 96 u16 rx_buffs = port_to_card(port)->rx_ring_buffers; 97 u16 tx_buffs = port_to_card(port)->tx_ring_buffers; 98 99 desc %= (transmit ? tx_buffs : rx_buffs); // called with "X + 1" etc. 100 return log_node(port) * (rx_buffs + tx_buffs) + 101 transmit * rx_buffs + desc; 102 } 103 104 105 static inline u16 desc_offset(port_t *port, u16 desc, int transmit) 106 { 107 /* Descriptor offset always fits in 16 bits */ 108 return desc_abs_number(port, desc, transmit) * sizeof(pkt_desc); 109 } 110 111 112 static inline pkt_desc __iomem *desc_address(port_t *port, u16 desc, 113 int transmit) 114 { 115 #ifdef PAGE0_ALWAYS_MAPPED 116 return (pkt_desc __iomem *)(win0base(port_to_card(port)) 117 + desc_offset(port, desc, transmit)); 118 #else 119 return (pkt_desc __iomem *)(winbase(port_to_card(port)) 120 + desc_offset(port, desc, transmit)); 121 #endif 122 } 123 124 125 static inline u32 buffer_offset(port_t *port, u16 desc, int transmit) 126 { 127 return port_to_card(port)->buff_offset + 128 desc_abs_number(port, desc, transmit) * (u32)HDLC_MAX_MRU; 129 } 130 131 132 static inline void sca_set_carrier(port_t *port) 133 { 134 if (!(sca_in(get_msci(port) + ST3, port_to_card(port)) & ST3_DCD)) { 135 #ifdef DEBUG_LINK 136 printk(KERN_DEBUG "%s: sca_set_carrier on\n", 137 port_to_dev(port)->name); 138 #endif 139 netif_carrier_on(port_to_dev(port)); 140 } else { 141 #ifdef DEBUG_LINK 142 printk(KERN_DEBUG "%s: sca_set_carrier off\n", 143 port_to_dev(port)->name); 144 #endif 145 netif_carrier_off(port_to_dev(port)); 146 } 147 } 148 149 150 static void sca_init_port(port_t *port) 151 { 152 card_t *card = port_to_card(port); 153 int transmit, i; 154 155 port->rxin = 0; 156 port->txin = 0; 157 port->txlast = 0; 158 159 #ifndef PAGE0_ALWAYS_MAPPED 160 openwin(card, 0); 161 #endif 162 163 for (transmit = 0; transmit < 2; transmit++) { 164 u16 dmac = transmit ? get_dmac_tx(port) : get_dmac_rx(port); 165 u16 buffs = transmit ? card->tx_ring_buffers 166 : card->rx_ring_buffers; 167 168 for (i = 0; i < buffs; i++) { 169 pkt_desc __iomem *desc = desc_address(port, i, transmit); 170 u16 chain_off = desc_offset(port, i + 1, transmit); 171 u32 buff_off = buffer_offset(port, i, transmit); 172 173 writew(chain_off, &desc->cp); 174 writel(buff_off, &desc->bp); 175 writew(0, &desc->len); 176 writeb(0, &desc->stat); 177 } 178 179 /* DMA disable - to halt state */ 180 sca_out(0, transmit ? DSR_TX(phy_node(port)) : 181 DSR_RX(phy_node(port)), card); 182 /* software ABORT - to initial state */ 183 sca_out(DCR_ABORT, transmit ? DCR_TX(phy_node(port)) : 184 DCR_RX(phy_node(port)), card); 185 186 /* current desc addr */ 187 sca_out(0, dmac + CPB, card); /* pointer base */ 188 sca_outw(desc_offset(port, 0, transmit), dmac + CDAL, card); 189 if (!transmit) 190 sca_outw(desc_offset(port, buffs - 1, transmit), 191 dmac + EDAL, card); 192 else 193 sca_outw(desc_offset(port, 0, transmit), dmac + EDAL, 194 card); 195 196 /* clear frame end interrupt counter */ 197 sca_out(DCR_CLEAR_EOF, transmit ? DCR_TX(phy_node(port)) : 198 DCR_RX(phy_node(port)), card); 199 200 if (!transmit) { /* Receive */ 201 /* set buffer length */ 202 sca_outw(HDLC_MAX_MRU, dmac + BFLL, card); 203 /* Chain mode, Multi-frame */ 204 sca_out(0x14, DMR_RX(phy_node(port)), card); 205 sca_out(DIR_EOME | DIR_BOFE, DIR_RX(phy_node(port)), 206 card); 207 /* DMA enable */ 208 sca_out(DSR_DE, DSR_RX(phy_node(port)), card); 209 } else { /* Transmit */ 210 /* Chain mode, Multi-frame */ 211 sca_out(0x14, DMR_TX(phy_node(port)), card); 212 /* enable underflow interrupts */ 213 sca_out(DIR_BOFE, DIR_TX(phy_node(port)), card); 214 } 215 } 216 sca_set_carrier(port); 217 } 218 219 220 #ifdef NEED_SCA_MSCI_INTR 221 /* MSCI interrupt service */ 222 static inline void sca_msci_intr(port_t *port) 223 { 224 u16 msci = get_msci(port); 225 card_t* card = port_to_card(port); 226 u8 stat = sca_in(msci + ST1, card); /* read MSCI ST1 status */ 227 228 /* Reset MSCI TX underrun and CDCD status bit */ 229 sca_out(stat & (ST1_UDRN | ST1_CDCD), msci + ST1, card); 230 231 if (stat & ST1_UDRN) { 232 /* TX Underrun error detected */ 233 port_to_dev(port)->stats.tx_errors++; 234 port_to_dev(port)->stats.tx_fifo_errors++; 235 } 236 237 if (stat & ST1_CDCD) 238 sca_set_carrier(port); 239 } 240 #endif 241 242 243 static inline void sca_rx(card_t *card, port_t *port, pkt_desc __iomem *desc, 244 u16 rxin) 245 { 246 struct net_device *dev = port_to_dev(port); 247 struct sk_buff *skb; 248 u16 len; 249 u32 buff; 250 u32 maxlen; 251 u8 page; 252 253 len = readw(&desc->len); 254 skb = dev_alloc_skb(len); 255 if (!skb) { 256 dev->stats.rx_dropped++; 257 return; 258 } 259 260 buff = buffer_offset(port, rxin, 0); 261 page = buff / winsize(card); 262 buff = buff % winsize(card); 263 maxlen = winsize(card) - buff; 264 265 openwin(card, page); 266 267 if (len > maxlen) { 268 memcpy_fromio(skb->data, winbase(card) + buff, maxlen); 269 openwin(card, page + 1); 270 memcpy_fromio(skb->data + maxlen, winbase(card), len - maxlen); 271 } else 272 memcpy_fromio(skb->data, winbase(card) + buff, len); 273 274 #ifndef PAGE0_ALWAYS_MAPPED 275 openwin(card, 0); /* select pkt_desc table page back */ 276 #endif 277 skb_put(skb, len); 278 #ifdef DEBUG_PKT 279 printk(KERN_DEBUG "%s RX(%i):", dev->name, skb->len); 280 debug_frame(skb); 281 #endif 282 dev->stats.rx_packets++; 283 dev->stats.rx_bytes += skb->len; 284 skb->protocol = hdlc_type_trans(skb, dev); 285 netif_rx(skb); 286 } 287 288 289 /* Receive DMA interrupt service */ 290 static inline void sca_rx_intr(port_t *port) 291 { 292 struct net_device *dev = port_to_dev(port); 293 u16 dmac = get_dmac_rx(port); 294 card_t *card = port_to_card(port); 295 u8 stat = sca_in(DSR_RX(phy_node(port)), card); /* read DMA Status */ 296 297 /* Reset DSR status bits */ 298 sca_out((stat & (DSR_EOT | DSR_EOM | DSR_BOF | DSR_COF)) | DSR_DWE, 299 DSR_RX(phy_node(port)), card); 300 301 if (stat & DSR_BOF) 302 /* Dropped one or more frames */ 303 dev->stats.rx_over_errors++; 304 305 while (1) { 306 u32 desc_off = desc_offset(port, port->rxin, 0); 307 pkt_desc __iomem *desc; 308 u32 cda = sca_inw(dmac + CDAL, card); 309 310 if ((cda >= desc_off) && (cda < desc_off + sizeof(pkt_desc))) 311 break; /* No frame received */ 312 313 desc = desc_address(port, port->rxin, 0); 314 stat = readb(&desc->stat); 315 if (!(stat & ST_RX_EOM)) 316 port->rxpart = 1; /* partial frame received */ 317 else if ((stat & ST_ERROR_MASK) || port->rxpart) { 318 dev->stats.rx_errors++; 319 if (stat & ST_RX_OVERRUN) 320 dev->stats.rx_fifo_errors++; 321 else if ((stat & (ST_RX_SHORT | ST_RX_ABORT | 322 ST_RX_RESBIT)) || port->rxpart) 323 dev->stats.rx_frame_errors++; 324 else if (stat & ST_RX_CRC) 325 dev->stats.rx_crc_errors++; 326 if (stat & ST_RX_EOM) 327 port->rxpart = 0; /* received last fragment */ 328 } else 329 sca_rx(card, port, desc, port->rxin); 330 331 /* Set new error descriptor address */ 332 sca_outw(desc_off, dmac + EDAL, card); 333 port->rxin = next_desc(port, port->rxin, 0); 334 } 335 336 /* make sure RX DMA is enabled */ 337 sca_out(DSR_DE, DSR_RX(phy_node(port)), card); 338 } 339 340 341 /* Transmit DMA interrupt service */ 342 static inline void sca_tx_intr(port_t *port) 343 { 344 struct net_device *dev = port_to_dev(port); 345 u16 dmac = get_dmac_tx(port); 346 card_t* card = port_to_card(port); 347 u8 stat; 348 349 spin_lock(&port->lock); 350 351 stat = sca_in(DSR_TX(phy_node(port)), card); /* read DMA Status */ 352 353 /* Reset DSR status bits */ 354 sca_out((stat & (DSR_EOT | DSR_EOM | DSR_BOF | DSR_COF)) | DSR_DWE, 355 DSR_TX(phy_node(port)), card); 356 357 while (1) { 358 pkt_desc __iomem *desc; 359 360 u32 desc_off = desc_offset(port, port->txlast, 1); 361 u32 cda = sca_inw(dmac + CDAL, card); 362 if ((cda >= desc_off) && (cda < desc_off + sizeof(pkt_desc))) 363 break; /* Transmitter is/will_be sending this frame */ 364 365 desc = desc_address(port, port->txlast, 1); 366 dev->stats.tx_packets++; 367 dev->stats.tx_bytes += readw(&desc->len); 368 writeb(0, &desc->stat); /* Free descriptor */ 369 port->txlast = next_desc(port, port->txlast, 1); 370 } 371 372 netif_wake_queue(dev); 373 spin_unlock(&port->lock); 374 } 375 376 377 static irqreturn_t sca_intr(int irq, void* dev_id) 378 { 379 card_t *card = dev_id; 380 int i; 381 u8 stat; 382 int handled = 0; 383 u8 page = sca_get_page(card); 384 385 while((stat = sca_intr_status(card)) != 0) { 386 handled = 1; 387 for (i = 0; i < 2; i++) { 388 port_t *port = get_port(card, i); 389 if (port) { 390 if (stat & SCA_INTR_MSCI(i)) 391 sca_msci_intr(port); 392 393 if (stat & SCA_INTR_DMAC_RX(i)) 394 sca_rx_intr(port); 395 396 if (stat & SCA_INTR_DMAC_TX(i)) 397 sca_tx_intr(port); 398 } 399 } 400 } 401 402 openwin(card, page); /* Restore original page */ 403 return IRQ_RETVAL(handled); 404 } 405 406 407 static void sca_set_port(port_t *port) 408 { 409 card_t* card = port_to_card(port); 410 u16 msci = get_msci(port); 411 u8 md2 = sca_in(msci + MD2, card); 412 unsigned int tmc, br = 10, brv = 1024; 413 414 415 if (port->settings.clock_rate > 0) { 416 /* Try lower br for better accuracy*/ 417 do { 418 br--; 419 brv >>= 1; /* brv = 2^9 = 512 max in specs */ 420 421 /* Baud Rate = CLOCK_BASE / TMC / 2^BR */ 422 tmc = CLOCK_BASE / brv / port->settings.clock_rate; 423 }while (br > 1 && tmc <= 128); 424 425 if (tmc < 1) { 426 tmc = 1; 427 br = 0; /* For baud=CLOCK_BASE we use tmc=1 br=0 */ 428 brv = 1; 429 } else if (tmc > 255) 430 tmc = 256; /* tmc=0 means 256 - low baud rates */ 431 432 port->settings.clock_rate = CLOCK_BASE / brv / tmc; 433 } else { 434 br = 9; /* Minimum clock rate */ 435 tmc = 256; /* 8bit = 0 */ 436 port->settings.clock_rate = CLOCK_BASE / (256 * 512); 437 } 438 439 port->rxs = (port->rxs & ~CLK_BRG_MASK) | br; 440 port->txs = (port->txs & ~CLK_BRG_MASK) | br; 441 port->tmc = tmc; 442 443 /* baud divisor - time constant*/ 444 sca_out(port->tmc, msci + TMC, card); 445 446 /* Set BRG bits */ 447 sca_out(port->rxs, msci + RXS, card); 448 sca_out(port->txs, msci + TXS, card); 449 450 if (port->settings.loopback) 451 md2 |= MD2_LOOPBACK; 452 else 453 md2 &= ~MD2_LOOPBACK; 454 455 sca_out(md2, msci + MD2, card); 456 457 } 458 459 460 static void sca_open(struct net_device *dev) 461 { 462 port_t *port = dev_to_port(dev); 463 card_t* card = port_to_card(port); 464 u16 msci = get_msci(port); 465 u8 md0, md2; 466 467 switch(port->encoding) { 468 case ENCODING_NRZ: md2 = MD2_NRZ; break; 469 case ENCODING_NRZI: md2 = MD2_NRZI; break; 470 case ENCODING_FM_MARK: md2 = MD2_FM_MARK; break; 471 case ENCODING_FM_SPACE: md2 = MD2_FM_SPACE; break; 472 default: md2 = MD2_MANCHESTER; 473 } 474 475 if (port->settings.loopback) 476 md2 |= MD2_LOOPBACK; 477 478 switch(port->parity) { 479 case PARITY_CRC16_PR0: md0 = MD0_HDLC | MD0_CRC_16_0; break; 480 case PARITY_CRC16_PR1: md0 = MD0_HDLC | MD0_CRC_16; break; 481 case PARITY_CRC16_PR0_CCITT: md0 = MD0_HDLC | MD0_CRC_ITU_0; break; 482 case PARITY_CRC16_PR1_CCITT: md0 = MD0_HDLC | MD0_CRC_ITU; break; 483 default: md0 = MD0_HDLC | MD0_CRC_NONE; 484 } 485 486 sca_out(CMD_RESET, msci + CMD, card); 487 sca_out(md0, msci + MD0, card); 488 sca_out(0x00, msci + MD1, card); /* no address field check */ 489 sca_out(md2, msci + MD2, card); 490 sca_out(0x7E, msci + IDL, card); /* flag character 0x7E */ 491 sca_out(CTL_IDLE, msci + CTL, card); 492 493 /* Allow at least 8 bytes before requesting RX DMA operation */ 494 /* TX with higher priority and possibly with shorter transfers */ 495 sca_out(0x07, msci + RRC, card); /* +1=RXRDY/DMA activation condition*/ 496 sca_out(0x10, msci + TRC0, card); /* = TXRDY/DMA activation condition*/ 497 sca_out(0x14, msci + TRC1, card); /* +1=TXRDY/DMA deactiv condition */ 498 499 /* We're using the following interrupts: 500 - TXINT (DMAC completed all transmisions, underrun or DCD change) 501 - all DMA interrupts 502 */ 503 sca_set_carrier(port); 504 505 /* MSCI TX INT and RX INT A IRQ enable */ 506 sca_out(IE0_TXINT | IE0_RXINTA, msci + IE0, card); 507 sca_out(IE1_UDRN | IE1_CDCD, msci + IE1, card); 508 sca_out(sca_in(IER0, card) | (phy_node(port) ? 0xC0 : 0x0C), 509 IER0, card); /* TXINT and RXINT */ 510 /* enable DMA IRQ */ 511 sca_out(sca_in(IER1, card) | (phy_node(port) ? 0xF0 : 0x0F), 512 IER1, card); 513 514 sca_out(port->tmc, msci + TMC, card); /* Restore registers */ 515 sca_out(port->rxs, msci + RXS, card); 516 sca_out(port->txs, msci + TXS, card); 517 sca_out(CMD_TX_ENABLE, msci + CMD, card); 518 sca_out(CMD_RX_ENABLE, msci + CMD, card); 519 520 netif_start_queue(dev); 521 } 522 523 524 static void sca_close(struct net_device *dev) 525 { 526 port_t *port = dev_to_port(dev); 527 card_t* card = port_to_card(port); 528 529 /* reset channel */ 530 sca_out(CMD_RESET, get_msci(port) + CMD, port_to_card(port)); 531 /* disable MSCI interrupts */ 532 sca_out(sca_in(IER0, card) & (phy_node(port) ? 0x0F : 0xF0), 533 IER0, card); 534 /* disable DMA interrupts */ 535 sca_out(sca_in(IER1, card) & (phy_node(port) ? 0x0F : 0xF0), 536 IER1, card); 537 538 netif_stop_queue(dev); 539 } 540 541 542 static int sca_attach(struct net_device *dev, unsigned short encoding, 543 unsigned short parity) 544 { 545 if (encoding != ENCODING_NRZ && 546 encoding != ENCODING_NRZI && 547 encoding != ENCODING_FM_MARK && 548 encoding != ENCODING_FM_SPACE && 549 encoding != ENCODING_MANCHESTER) 550 return -EINVAL; 551 552 if (parity != PARITY_NONE && 553 parity != PARITY_CRC16_PR0 && 554 parity != PARITY_CRC16_PR1 && 555 parity != PARITY_CRC16_PR0_CCITT && 556 parity != PARITY_CRC16_PR1_CCITT) 557 return -EINVAL; 558 559 dev_to_port(dev)->encoding = encoding; 560 dev_to_port(dev)->parity = parity; 561 return 0; 562 } 563 564 565 #ifdef DEBUG_RINGS 566 static void sca_dump_rings(struct net_device *dev) 567 { 568 port_t *port = dev_to_port(dev); 569 card_t *card = port_to_card(port); 570 u16 cnt; 571 #ifndef PAGE0_ALWAYS_MAPPED 572 u8 page = sca_get_page(card); 573 574 openwin(card, 0); 575 #endif 576 577 printk(KERN_DEBUG "RX ring: CDA=%u EDA=%u DSR=%02X in=%u %sactive", 578 sca_inw(get_dmac_rx(port) + CDAL, card), 579 sca_inw(get_dmac_rx(port) + EDAL, card), 580 sca_in(DSR_RX(phy_node(port)), card), port->rxin, 581 sca_in(DSR_RX(phy_node(port)), card) & DSR_DE ? "" : "in"); 582 for (cnt = 0; cnt < port_to_card(port)->rx_ring_buffers; cnt++) 583 pr_cont(" %02X", readb(&(desc_address(port, cnt, 0)->stat))); 584 pr_cont("\n"); 585 586 printk(KERN_DEBUG "TX ring: CDA=%u EDA=%u DSR=%02X in=%u " 587 "last=%u %sactive", 588 sca_inw(get_dmac_tx(port) + CDAL, card), 589 sca_inw(get_dmac_tx(port) + EDAL, card), 590 sca_in(DSR_TX(phy_node(port)), card), port->txin, port->txlast, 591 sca_in(DSR_TX(phy_node(port)), card) & DSR_DE ? "" : "in"); 592 593 for (cnt = 0; cnt < port_to_card(port)->tx_ring_buffers; cnt++) 594 pr_cont(" %02X", readb(&(desc_address(port, cnt, 1)->stat))); 595 pr_cont("\n"); 596 597 printk(KERN_DEBUG "MSCI: MD: %02x %02x %02x, ST: %02x %02x %02x %02x," 598 " FST: %02x CST: %02x %02x\n", 599 sca_in(get_msci(port) + MD0, card), 600 sca_in(get_msci(port) + MD1, card), 601 sca_in(get_msci(port) + MD2, card), 602 sca_in(get_msci(port) + ST0, card), 603 sca_in(get_msci(port) + ST1, card), 604 sca_in(get_msci(port) + ST2, card), 605 sca_in(get_msci(port) + ST3, card), 606 sca_in(get_msci(port) + FST, card), 607 sca_in(get_msci(port) + CST0, card), 608 sca_in(get_msci(port) + CST1, card)); 609 610 printk(KERN_DEBUG "ISR: %02x %02x %02x\n", sca_in(ISR0, card), 611 sca_in(ISR1, card), sca_in(ISR2, card)); 612 613 #ifndef PAGE0_ALWAYS_MAPPED 614 openwin(card, page); /* Restore original page */ 615 #endif 616 } 617 #endif /* DEBUG_RINGS */ 618 619 620 static netdev_tx_t sca_xmit(struct sk_buff *skb, struct net_device *dev) 621 { 622 port_t *port = dev_to_port(dev); 623 card_t *card = port_to_card(port); 624 pkt_desc __iomem *desc; 625 u32 buff, len; 626 u8 page; 627 u32 maxlen; 628 629 spin_lock_irq(&port->lock); 630 631 desc = desc_address(port, port->txin + 1, 1); 632 BUG_ON(readb(&desc->stat)); /* previous xmit should stop queue */ 633 634 #ifdef DEBUG_PKT 635 printk(KERN_DEBUG "%s TX(%i):", dev->name, skb->len); 636 debug_frame(skb); 637 #endif 638 639 desc = desc_address(port, port->txin, 1); 640 buff = buffer_offset(port, port->txin, 1); 641 len = skb->len; 642 page = buff / winsize(card); 643 buff = buff % winsize(card); 644 maxlen = winsize(card) - buff; 645 646 openwin(card, page); 647 if (len > maxlen) { 648 memcpy_toio(winbase(card) + buff, skb->data, maxlen); 649 openwin(card, page + 1); 650 memcpy_toio(winbase(card), skb->data + maxlen, len - maxlen); 651 } else 652 memcpy_toio(winbase(card) + buff, skb->data, len); 653 654 #ifndef PAGE0_ALWAYS_MAPPED 655 openwin(card, 0); /* select pkt_desc table page back */ 656 #endif 657 writew(len, &desc->len); 658 writeb(ST_TX_EOM, &desc->stat); 659 660 port->txin = next_desc(port, port->txin, 1); 661 sca_outw(desc_offset(port, port->txin, 1), 662 get_dmac_tx(port) + EDAL, card); 663 664 sca_out(DSR_DE, DSR_TX(phy_node(port)), card); /* Enable TX DMA */ 665 666 desc = desc_address(port, port->txin + 1, 1); 667 if (readb(&desc->stat)) /* allow 1 packet gap */ 668 netif_stop_queue(dev); 669 670 spin_unlock_irq(&port->lock); 671 672 dev_kfree_skb(skb); 673 return NETDEV_TX_OK; 674 } 675 676 677 #ifdef NEED_DETECT_RAM 678 static u32 sca_detect_ram(card_t *card, u8 __iomem *rambase, u32 ramsize) 679 { 680 /* Round RAM size to 32 bits, fill from end to start */ 681 u32 i = ramsize &= ~3; 682 u32 size = winsize(card); 683 684 openwin(card, (i - 4) / size); /* select last window */ 685 686 do { 687 i -= 4; 688 if ((i + 4) % size == 0) 689 openwin(card, i / size); 690 writel(i ^ 0x12345678, rambase + i % size); 691 } while (i > 0); 692 693 for (i = 0; i < ramsize ; i += 4) { 694 if (i % size == 0) 695 openwin(card, i / size); 696 697 if (readl(rambase + i % size) != (i ^ 0x12345678)) 698 break; 699 } 700 701 return i; 702 } 703 #endif /* NEED_DETECT_RAM */ 704 705 706 static void sca_init(card_t *card, int wait_states) 707 { 708 sca_out(wait_states, WCRL, card); /* Wait Control */ 709 sca_out(wait_states, WCRM, card); 710 sca_out(wait_states, WCRH, card); 711 712 sca_out(0, DMER, card); /* DMA Master disable */ 713 sca_out(0x03, PCR, card); /* DMA priority */ 714 sca_out(0, DSR_RX(0), card); /* DMA disable - to halt state */ 715 sca_out(0, DSR_TX(0), card); 716 sca_out(0, DSR_RX(1), card); 717 sca_out(0, DSR_TX(1), card); 718 sca_out(DMER_DME, DMER, card); /* DMA Master enable */ 719 } 720