drivers/net/wan/hd64570.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
port_to_dev
sca_intr_status
dev_to_port
next_desc
desc_abs_number
desc_offset
desc_address
buffer_offset
sca_set_carrier
sca_init_port
sca_msci_intr
sca_rx
sca_rx_intr
sca_tx_intr
sca_intr
sca_set_port
sca_open
sca_close
sca_attach
sca_dump_rings
sca_xmit
sca_detect_ram
sca_init
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Hitachi SCA HD64570 driver for Linux
   4  *
   5  * Copyright (C) 1998-2003 Krzysztof Halasa <khc@pm.waw.pl>
   6  *
   7  * Source of information: Hitachi HD64570 SCA User's Manual
   8  *
   9  * We use the following SCA memory map:
  10  *
  11  * Packet buffer descriptor rings - starting from winbase or win0base:
  12  * rx_ring_buffers * sizeof(pkt_desc) = logical channel #0 RX ring
  13  * tx_ring_buffers * sizeof(pkt_desc) = logical channel #0 TX ring
  14  * rx_ring_buffers * sizeof(pkt_desc) = logical channel #1 RX ring (if used)
  15  * tx_ring_buffers * sizeof(pkt_desc) = logical channel #1 TX ring (if used)
  16  *
  17  * Packet data buffers - starting from winbase + buff_offset:
  18  * rx_ring_buffers * HDLC_MAX_MRU     = logical channel #0 RX buffers
  19  * tx_ring_buffers * HDLC_MAX_MRU     = logical channel #0 TX buffers
  20  * rx_ring_buffers * HDLC_MAX_MRU     = logical channel #0 RX buffers (if used)
  21  * tx_ring_buffers * HDLC_MAX_MRU     = logical channel #0 TX buffers (if used)
  22  */
  23 
  24 #include <linux/bitops.h>
  25 #include <linux/errno.h>
  26 #include <linux/fcntl.h>
  27 #include <linux/hdlc.h>
  28 #include <linux/in.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/ioport.h>
  31 #include <linux/jiffies.h>
  32 #include <linux/kernel.h>
  33 #include <linux/module.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/skbuff.h>
  36 #include <linux/string.h>
  37 #include <linux/types.h>
  38 #include <asm/io.h>
  39 #include <linux/uaccess.h>
  40 #include "hd64570.h"
  41 
  42 #define get_msci(port)    (phy_node(port) ?   MSCI1_OFFSET :   MSCI0_OFFSET)
  43 #define get_dmac_rx(port) (phy_node(port) ? DMAC1RX_OFFSET : DMAC0RX_OFFSET)
  44 #define get_dmac_tx(port) (phy_node(port) ? DMAC1TX_OFFSET : DMAC0TX_OFFSET)
  45 
  46 #define SCA_INTR_MSCI(node)    (node ? 0x10 : 0x01)
  47 #define SCA_INTR_DMAC_RX(node) (node ? 0x20 : 0x02)
  48 #define SCA_INTR_DMAC_TX(node) (node ? 0x40 : 0x04)
  49 
  50 
  51 static inline struct net_device *port_to_dev(port_t *port)
  52 {
  53         return port->dev;
  54 }
  55 
  56 static inline int sca_intr_status(card_t *card)
  57 {
  58         u8 result = 0;
  59         u8 isr0 = sca_in(ISR0, card);
  60         u8 isr1 = sca_in(ISR1, card);
  61 
  62         if (isr1 & 0x03) result |= SCA_INTR_DMAC_RX(0);
  63         if (isr1 & 0x0C) result |= SCA_INTR_DMAC_TX(0);
  64         if (isr1 & 0x30) result |= SCA_INTR_DMAC_RX(1);
  65         if (isr1 & 0xC0) result |= SCA_INTR_DMAC_TX(1);
  66         if (isr0 & 0x0F) result |= SCA_INTR_MSCI(0);
  67         if (isr0 & 0xF0) result |= SCA_INTR_MSCI(1);
  68 
  69         if (!(result & SCA_INTR_DMAC_TX(0)))
  70                 if (sca_in(DSR_TX(0), card) & DSR_EOM)
  71                         result |= SCA_INTR_DMAC_TX(0);
  72         if (!(result & SCA_INTR_DMAC_TX(1)))
  73                 if (sca_in(DSR_TX(1), card) & DSR_EOM)
  74                         result |= SCA_INTR_DMAC_TX(1);
  75 
  76         return result;
  77 }
  78 
  79 static inline port_t* dev_to_port(struct net_device *dev)
  80 {
  81         return dev_to_hdlc(dev)->priv;
  82 }
  83 
  84 static inline u16 next_desc(port_t *port, u16 desc, int transmit)
  85 {
  86         return (desc + 1) % (transmit ? port_to_card(port)->tx_ring_buffers
  87                              : port_to_card(port)->rx_ring_buffers);
  88 }
  89 
  90 
  91 static inline u16 desc_abs_number(port_t *port, u16 desc, int transmit)
  92 {
  93         u16 rx_buffs = port_to_card(port)->rx_ring_buffers;
  94         u16 tx_buffs = port_to_card(port)->tx_ring_buffers;
  95 
  96         desc %= (transmit ? tx_buffs : rx_buffs); // called with "X + 1" etc.
  97         return log_node(port) * (rx_buffs + tx_buffs) +
  98                 transmit * rx_buffs + desc;
  99 }
 100 
 101 
 102 static inline u16 desc_offset(port_t *port, u16 desc, int transmit)
 103 {
 104         /* Descriptor offset always fits in 16 bits */
 105         return desc_abs_number(port, desc, transmit) * sizeof(pkt_desc);
 106 }
 107 
 108 
 109 static inline pkt_desc __iomem *desc_address(port_t *port, u16 desc,
 110                                              int transmit)
 111 {
 112 #ifdef PAGE0_ALWAYS_MAPPED
 113         return (pkt_desc __iomem *)(win0base(port_to_card(port))
 114                                     + desc_offset(port, desc, transmit));
 115 #else
 116         return (pkt_desc __iomem *)(winbase(port_to_card(port))
 117                                     + desc_offset(port, desc, transmit));
 118 #endif
 119 }
 120 
 121 
 122 static inline u32 buffer_offset(port_t *port, u16 desc, int transmit)
 123 {
 124         return port_to_card(port)->buff_offset +
 125                 desc_abs_number(port, desc, transmit) * (u32)HDLC_MAX_MRU;
 126 }
 127 
 128 
 129 static inline void sca_set_carrier(port_t *port)
 130 {
 131         if (!(sca_in(get_msci(port) + ST3, port_to_card(port)) & ST3_DCD)) {
 132 #ifdef DEBUG_LINK
 133                 printk(KERN_DEBUG "%s: sca_set_carrier on\n",
 134                        port_to_dev(port)->name);
 135 #endif
 136                 netif_carrier_on(port_to_dev(port));
 137         } else {
 138 #ifdef DEBUG_LINK
 139                 printk(KERN_DEBUG "%s: sca_set_carrier off\n",
 140                        port_to_dev(port)->name);
 141 #endif
 142                 netif_carrier_off(port_to_dev(port));
 143         }
 144 }
 145 
 146 
 147 static void sca_init_port(port_t *port)
 148 {
 149         card_t *card = port_to_card(port);
 150         int transmit, i;
 151 
 152         port->rxin = 0;
 153         port->txin = 0;
 154         port->txlast = 0;
 155 
 156 #ifndef PAGE0_ALWAYS_MAPPED
 157         openwin(card, 0);
 158 #endif
 159 
 160         for (transmit = 0; transmit < 2; transmit++) {
 161                 u16 dmac = transmit ? get_dmac_tx(port) : get_dmac_rx(port);
 162                 u16 buffs = transmit ? card->tx_ring_buffers
 163                         : card->rx_ring_buffers;
 164 
 165                 for (i = 0; i < buffs; i++) {
 166                         pkt_desc __iomem *desc = desc_address(port, i, transmit);
 167                         u16 chain_off = desc_offset(port, i + 1, transmit);
 168                         u32 buff_off = buffer_offset(port, i, transmit);
 169 
 170                         writew(chain_off, &desc->cp);
 171                         writel(buff_off, &desc->bp);
 172                         writew(0, &desc->len);
 173                         writeb(0, &desc->stat);
 174                 }
 175 
 176                 /* DMA disable - to halt state */
 177                 sca_out(0, transmit ? DSR_TX(phy_node(port)) :
 178                         DSR_RX(phy_node(port)), card);
 179                 /* software ABORT - to initial state */
 180                 sca_out(DCR_ABORT, transmit ? DCR_TX(phy_node(port)) :
 181                         DCR_RX(phy_node(port)), card);
 182 
 183                 /* current desc addr */
 184                 sca_out(0, dmac + CPB, card); /* pointer base */
 185                 sca_outw(desc_offset(port, 0, transmit), dmac + CDAL, card);
 186                 if (!transmit)
 187                         sca_outw(desc_offset(port, buffs - 1, transmit),
 188                                  dmac + EDAL, card);
 189                 else
 190                         sca_outw(desc_offset(port, 0, transmit), dmac + EDAL,
 191                                  card);
 192 
 193                 /* clear frame end interrupt counter */
 194                 sca_out(DCR_CLEAR_EOF, transmit ? DCR_TX(phy_node(port)) :
 195                         DCR_RX(phy_node(port)), card);
 196 
 197                 if (!transmit) { /* Receive */
 198                         /* set buffer length */
 199                         sca_outw(HDLC_MAX_MRU, dmac + BFLL, card);
 200                         /* Chain mode, Multi-frame */
 201                         sca_out(0x14, DMR_RX(phy_node(port)), card);
 202                         sca_out(DIR_EOME | DIR_BOFE, DIR_RX(phy_node(port)),
 203                                 card);
 204                         /* DMA enable */
 205                         sca_out(DSR_DE, DSR_RX(phy_node(port)), card);
 206                 } else {        /* Transmit */
 207                         /* Chain mode, Multi-frame */
 208                         sca_out(0x14, DMR_TX(phy_node(port)), card);
 209                         /* enable underflow interrupts */
 210                         sca_out(DIR_BOFE, DIR_TX(phy_node(port)), card);
 211                 }
 212         }
 213         sca_set_carrier(port);
 214 }
 215 
 216 
 217 #ifdef NEED_SCA_MSCI_INTR
 218 /* MSCI interrupt service */
 219 static inline void sca_msci_intr(port_t *port)
 220 {
 221         u16 msci = get_msci(port);
 222         card_t* card = port_to_card(port);
 223         u8 stat = sca_in(msci + ST1, card); /* read MSCI ST1 status */
 224 
 225         /* Reset MSCI TX underrun and CDCD status bit */
 226         sca_out(stat & (ST1_UDRN | ST1_CDCD), msci + ST1, card);
 227 
 228         if (stat & ST1_UDRN) {
 229                 /* TX Underrun error detected */
 230                 port_to_dev(port)->stats.tx_errors++;
 231                 port_to_dev(port)->stats.tx_fifo_errors++;
 232         }
 233 
 234         if (stat & ST1_CDCD)
 235                 sca_set_carrier(port);
 236 }
 237 #endif
 238 
 239 
 240 static inline void sca_rx(card_t *card, port_t *port, pkt_desc __iomem *desc,
 241                           u16 rxin)
 242 {
 243         struct net_device *dev = port_to_dev(port);
 244         struct sk_buff *skb;
 245         u16 len;
 246         u32 buff;
 247         u32 maxlen;
 248         u8 page;
 249 
 250         len = readw(&desc->len);
 251         skb = dev_alloc_skb(len);
 252         if (!skb) {
 253                 dev->stats.rx_dropped++;
 254                 return;
 255         }
 256 
 257         buff = buffer_offset(port, rxin, 0);
 258         page = buff / winsize(card);
 259         buff = buff % winsize(card);
 260         maxlen = winsize(card) - buff;
 261 
 262         openwin(card, page);
 263 
 264         if (len > maxlen) {
 265                 memcpy_fromio(skb->data, winbase(card) + buff, maxlen);
 266                 openwin(card, page + 1);
 267                 memcpy_fromio(skb->data + maxlen, winbase(card), len - maxlen);
 268         } else
 269                 memcpy_fromio(skb->data, winbase(card) + buff, len);
 270 
 271 #ifndef PAGE0_ALWAYS_MAPPED
 272         openwin(card, 0);       /* select pkt_desc table page back */
 273 #endif
 274         skb_put(skb, len);
 275 #ifdef DEBUG_PKT
 276         printk(KERN_DEBUG "%s RX(%i):", dev->name, skb->len);
 277         debug_frame(skb);
 278 #endif
 279         dev->stats.rx_packets++;
 280         dev->stats.rx_bytes += skb->len;
 281         skb->protocol = hdlc_type_trans(skb, dev);
 282         netif_rx(skb);
 283 }
 284 
 285 
 286 /* Receive DMA interrupt service */
 287 static inline void sca_rx_intr(port_t *port)
 288 {
 289         struct net_device *dev = port_to_dev(port);
 290         u16 dmac = get_dmac_rx(port);
 291         card_t *card = port_to_card(port);
 292         u8 stat = sca_in(DSR_RX(phy_node(port)), card); /* read DMA Status */
 293 
 294         /* Reset DSR status bits */
 295         sca_out((stat & (DSR_EOT | DSR_EOM | DSR_BOF | DSR_COF)) | DSR_DWE,
 296                 DSR_RX(phy_node(port)), card);
 297 
 298         if (stat & DSR_BOF)
 299                 /* Dropped one or more frames */
 300                 dev->stats.rx_over_errors++;
 301 
 302         while (1) {
 303                 u32 desc_off = desc_offset(port, port->rxin, 0);
 304                 pkt_desc __iomem *desc;
 305                 u32 cda = sca_inw(dmac + CDAL, card);
 306 
 307                 if ((cda >= desc_off) && (cda < desc_off + sizeof(pkt_desc)))
 308                         break;  /* No frame received */
 309 
 310                 desc = desc_address(port, port->rxin, 0);
 311                 stat = readb(&desc->stat);
 312                 if (!(stat & ST_RX_EOM))
 313                         port->rxpart = 1; /* partial frame received */
 314                 else if ((stat & ST_ERROR_MASK) || port->rxpart) {
 315                         dev->stats.rx_errors++;
 316                         if (stat & ST_RX_OVERRUN)
 317                                 dev->stats.rx_fifo_errors++;
 318                         else if ((stat & (ST_RX_SHORT | ST_RX_ABORT |
 319                                           ST_RX_RESBIT)) || port->rxpart)
 320                                 dev->stats.rx_frame_errors++;
 321                         else if (stat & ST_RX_CRC)
 322                                 dev->stats.rx_crc_errors++;
 323                         if (stat & ST_RX_EOM)
 324                                 port->rxpart = 0; /* received last fragment */
 325                 } else
 326                         sca_rx(card, port, desc, port->rxin);
 327 
 328                 /* Set new error descriptor address */
 329                 sca_outw(desc_off, dmac + EDAL, card);
 330                 port->rxin = next_desc(port, port->rxin, 0);
 331         }
 332 
 333         /* make sure RX DMA is enabled */
 334         sca_out(DSR_DE, DSR_RX(phy_node(port)), card);
 335 }
 336 
 337 
 338 /* Transmit DMA interrupt service */
 339 static inline void sca_tx_intr(port_t *port)
 340 {
 341         struct net_device *dev = port_to_dev(port);
 342         u16 dmac = get_dmac_tx(port);
 343         card_t* card = port_to_card(port);
 344         u8 stat;
 345 
 346         spin_lock(&port->lock);
 347 
 348         stat = sca_in(DSR_TX(phy_node(port)), card); /* read DMA Status */
 349 
 350         /* Reset DSR status bits */
 351         sca_out((stat & (DSR_EOT | DSR_EOM | DSR_BOF | DSR_COF)) | DSR_DWE,
 352                 DSR_TX(phy_node(port)), card);
 353 
 354         while (1) {
 355                 pkt_desc __iomem *desc;
 356 
 357                 u32 desc_off = desc_offset(port, port->txlast, 1);
 358                 u32 cda = sca_inw(dmac + CDAL, card);
 359                 if ((cda >= desc_off) && (cda < desc_off + sizeof(pkt_desc)))
 360                         break;  /* Transmitter is/will_be sending this frame */
 361 
 362                 desc = desc_address(port, port->txlast, 1);
 363                 dev->stats.tx_packets++;
 364                 dev->stats.tx_bytes += readw(&desc->len);
 365                 writeb(0, &desc->stat); /* Free descriptor */
 366                 port->txlast = next_desc(port, port->txlast, 1);
 367         }
 368 
 369         netif_wake_queue(dev);
 370         spin_unlock(&port->lock);
 371 }
 372 
 373 
 374 static irqreturn_t sca_intr(int irq, void* dev_id)
 375 {
 376         card_t *card = dev_id;
 377         int i;
 378         u8 stat;
 379         int handled = 0;
 380         u8 page = sca_get_page(card);
 381 
 382         while((stat = sca_intr_status(card)) != 0) {
 383                 handled = 1;
 384                 for (i = 0; i < 2; i++) {
 385                         port_t *port = get_port(card, i);
 386                         if (port) {
 387                                 if (stat & SCA_INTR_MSCI(i))
 388                                         sca_msci_intr(port);
 389 
 390                                 if (stat & SCA_INTR_DMAC_RX(i))
 391                                         sca_rx_intr(port);
 392 
 393                                 if (stat & SCA_INTR_DMAC_TX(i))
 394                                         sca_tx_intr(port);
 395                         }
 396                 }
 397         }
 398 
 399         openwin(card, page);            /* Restore original page */
 400         return IRQ_RETVAL(handled);
 401 }
 402 
 403 
 404 static void sca_set_port(port_t *port)
 405 {
 406         card_t* card = port_to_card(port);
 407         u16 msci = get_msci(port);
 408         u8 md2 = sca_in(msci + MD2, card);
 409         unsigned int tmc, br = 10, brv = 1024;
 410 
 411 
 412         if (port->settings.clock_rate > 0) {
 413                 /* Try lower br for better accuracy*/
 414                 do {
 415                         br--;
 416                         brv >>= 1; /* brv = 2^9 = 512 max in specs */
 417 
 418                         /* Baud Rate = CLOCK_BASE / TMC / 2^BR */
 419                         tmc = CLOCK_BASE / brv / port->settings.clock_rate;
 420                 }while (br > 1 && tmc <= 128);
 421 
 422                 if (tmc < 1) {
 423                         tmc = 1;
 424                         br = 0; /* For baud=CLOCK_BASE we use tmc=1 br=0 */
 425                         brv = 1;
 426                 } else if (tmc > 255)
 427                         tmc = 256; /* tmc=0 means 256 - low baud rates */
 428 
 429                 port->settings.clock_rate = CLOCK_BASE / brv / tmc;
 430         } else {
 431                 br = 9; /* Minimum clock rate */
 432                 tmc = 256;      /* 8bit = 0 */
 433                 port->settings.clock_rate = CLOCK_BASE / (256 * 512);
 434         }
 435 
 436         port->rxs = (port->rxs & ~CLK_BRG_MASK) | br;
 437         port->txs = (port->txs & ~CLK_BRG_MASK) | br;
 438         port->tmc = tmc;
 439 
 440         /* baud divisor - time constant*/
 441         sca_out(port->tmc, msci + TMC, card);
 442 
 443         /* Set BRG bits */
 444         sca_out(port->rxs, msci + RXS, card);
 445         sca_out(port->txs, msci + TXS, card);
 446 
 447         if (port->settings.loopback)
 448                 md2 |= MD2_LOOPBACK;
 449         else
 450                 md2 &= ~MD2_LOOPBACK;
 451 
 452         sca_out(md2, msci + MD2, card);
 453 
 454 }
 455 
 456 
 457 static void sca_open(struct net_device *dev)
 458 {
 459         port_t *port = dev_to_port(dev);
 460         card_t* card = port_to_card(port);
 461         u16 msci = get_msci(port);
 462         u8 md0, md2;
 463 
 464         switch(port->encoding) {
 465         case ENCODING_NRZ:      md2 = MD2_NRZ;          break;
 466         case ENCODING_NRZI:     md2 = MD2_NRZI;         break;
 467         case ENCODING_FM_MARK:  md2 = MD2_FM_MARK;      break;
 468         case ENCODING_FM_SPACE: md2 = MD2_FM_SPACE;     break;
 469         default:                md2 = MD2_MANCHESTER;
 470         }
 471 
 472         if (port->settings.loopback)
 473                 md2 |= MD2_LOOPBACK;
 474 
 475         switch(port->parity) {
 476         case PARITY_CRC16_PR0:       md0 = MD0_HDLC | MD0_CRC_16_0;  break;
 477         case PARITY_CRC16_PR1:       md0 = MD0_HDLC | MD0_CRC_16;    break;
 478         case PARITY_CRC16_PR0_CCITT: md0 = MD0_HDLC | MD0_CRC_ITU_0; break;
 479         case PARITY_CRC16_PR1_CCITT: md0 = MD0_HDLC | MD0_CRC_ITU;   break;
 480         default:                     md0 = MD0_HDLC | MD0_CRC_NONE;
 481         }
 482 
 483         sca_out(CMD_RESET, msci + CMD, card);
 484         sca_out(md0, msci + MD0, card);
 485         sca_out(0x00, msci + MD1, card); /* no address field check */
 486         sca_out(md2, msci + MD2, card);
 487         sca_out(0x7E, msci + IDL, card); /* flag character 0x7E */
 488         sca_out(CTL_IDLE, msci + CTL, card);
 489 
 490         /* Allow at least 8 bytes before requesting RX DMA operation */
 491         /* TX with higher priority and possibly with shorter transfers */
 492         sca_out(0x07, msci + RRC, card); /* +1=RXRDY/DMA activation condition*/
 493         sca_out(0x10, msci + TRC0, card); /* = TXRDY/DMA activation condition*/
 494         sca_out(0x14, msci + TRC1, card); /* +1=TXRDY/DMA deactiv condition */
 495 
 496 /* We're using the following interrupts:
 497    - TXINT (DMAC completed all transmisions, underrun or DCD change)
 498    - all DMA interrupts
 499 */
 500         sca_set_carrier(port);
 501 
 502         /* MSCI TX INT and RX INT A IRQ enable */
 503         sca_out(IE0_TXINT | IE0_RXINTA, msci + IE0, card);
 504         sca_out(IE1_UDRN | IE1_CDCD, msci + IE1, card);
 505         sca_out(sca_in(IER0, card) | (phy_node(port) ? 0xC0 : 0x0C),
 506                 IER0, card); /* TXINT and RXINT */
 507         /* enable DMA IRQ */
 508         sca_out(sca_in(IER1, card) | (phy_node(port) ? 0xF0 : 0x0F),
 509                 IER1, card);
 510 
 511         sca_out(port->tmc, msci + TMC, card); /* Restore registers */
 512         sca_out(port->rxs, msci + RXS, card);
 513         sca_out(port->txs, msci + TXS, card);
 514         sca_out(CMD_TX_ENABLE, msci + CMD, card);
 515         sca_out(CMD_RX_ENABLE, msci + CMD, card);
 516 
 517         netif_start_queue(dev);
 518 }
 519 
 520 
 521 static void sca_close(struct net_device *dev)
 522 {
 523         port_t *port = dev_to_port(dev);
 524         card_t* card = port_to_card(port);
 525 
 526         /* reset channel */
 527         sca_out(CMD_RESET, get_msci(port) + CMD, port_to_card(port));
 528         /* disable MSCI interrupts */
 529         sca_out(sca_in(IER0, card) & (phy_node(port) ? 0x0F : 0xF0),
 530                 IER0, card);
 531         /* disable DMA interrupts */
 532         sca_out(sca_in(IER1, card) & (phy_node(port) ? 0x0F : 0xF0),
 533                 IER1, card);
 534 
 535         netif_stop_queue(dev);
 536 }
 537 
 538 
 539 static int sca_attach(struct net_device *dev, unsigned short encoding,
 540                       unsigned short parity)
 541 {
 542         if (encoding != ENCODING_NRZ &&
 543             encoding != ENCODING_NRZI &&
 544             encoding != ENCODING_FM_MARK &&
 545             encoding != ENCODING_FM_SPACE &&
 546             encoding != ENCODING_MANCHESTER)
 547                 return -EINVAL;
 548 
 549         if (parity != PARITY_NONE &&
 550             parity != PARITY_CRC16_PR0 &&
 551             parity != PARITY_CRC16_PR1 &&
 552             parity != PARITY_CRC16_PR0_CCITT &&
 553             parity != PARITY_CRC16_PR1_CCITT)
 554                 return -EINVAL;
 555 
 556         dev_to_port(dev)->encoding = encoding;
 557         dev_to_port(dev)->parity = parity;
 558         return 0;
 559 }
 560 
 561 
 562 #ifdef DEBUG_RINGS
 563 static void sca_dump_rings(struct net_device *dev)
 564 {
 565         port_t *port = dev_to_port(dev);
 566         card_t *card = port_to_card(port);
 567         u16 cnt;
 568 #ifndef PAGE0_ALWAYS_MAPPED
 569         u8 page = sca_get_page(card);
 570 
 571         openwin(card, 0);
 572 #endif
 573 
 574         printk(KERN_DEBUG "RX ring: CDA=%u EDA=%u DSR=%02X in=%u %sactive",
 575                sca_inw(get_dmac_rx(port) + CDAL, card),
 576                sca_inw(get_dmac_rx(port) + EDAL, card),
 577                sca_in(DSR_RX(phy_node(port)), card), port->rxin,
 578                sca_in(DSR_RX(phy_node(port)), card) & DSR_DE ? "" : "in");
 579         for (cnt = 0; cnt < port_to_card(port)->rx_ring_buffers; cnt++)
 580                 pr_cont(" %02X", readb(&(desc_address(port, cnt, 0)->stat)));
 581         pr_cont("\n");
 582 
 583         printk(KERN_DEBUG "TX ring: CDA=%u EDA=%u DSR=%02X in=%u "
 584                "last=%u %sactive",
 585                sca_inw(get_dmac_tx(port) + CDAL, card),
 586                sca_inw(get_dmac_tx(port) + EDAL, card),
 587                sca_in(DSR_TX(phy_node(port)), card), port->txin, port->txlast,
 588                sca_in(DSR_TX(phy_node(port)), card) & DSR_DE ? "" : "in");
 589 
 590         for (cnt = 0; cnt < port_to_card(port)->tx_ring_buffers; cnt++)
 591                 pr_cont(" %02X", readb(&(desc_address(port, cnt, 1)->stat)));
 592         pr_cont("\n");
 593 
 594         printk(KERN_DEBUG "MSCI: MD: %02x %02x %02x, ST: %02x %02x %02x %02x,"
 595                " FST: %02x CST: %02x %02x\n",
 596                sca_in(get_msci(port) + MD0, card),
 597                sca_in(get_msci(port) + MD1, card),
 598                sca_in(get_msci(port) + MD2, card),
 599                sca_in(get_msci(port) + ST0, card),
 600                sca_in(get_msci(port) + ST1, card),
 601                sca_in(get_msci(port) + ST2, card),
 602                sca_in(get_msci(port) + ST3, card),
 603                sca_in(get_msci(port) + FST, card),
 604                sca_in(get_msci(port) + CST0, card),
 605                sca_in(get_msci(port) + CST1, card));
 606 
 607         printk(KERN_DEBUG "ISR: %02x %02x %02x\n", sca_in(ISR0, card),
 608                sca_in(ISR1, card), sca_in(ISR2, card));
 609 
 610 #ifndef PAGE0_ALWAYS_MAPPED
 611         openwin(card, page); /* Restore original page */
 612 #endif
 613 }
 614 #endif /* DEBUG_RINGS */
 615 
 616 
 617 static netdev_tx_t sca_xmit(struct sk_buff *skb, struct net_device *dev)
 618 {
 619         port_t *port = dev_to_port(dev);
 620         card_t *card = port_to_card(port);
 621         pkt_desc __iomem *desc;
 622         u32 buff, len;
 623         u8 page;
 624         u32 maxlen;
 625 
 626         spin_lock_irq(&port->lock);
 627 
 628         desc = desc_address(port, port->txin + 1, 1);
 629         BUG_ON(readb(&desc->stat)); /* previous xmit should stop queue */
 630 
 631 #ifdef DEBUG_PKT
 632         printk(KERN_DEBUG "%s TX(%i):", dev->name, skb->len);
 633         debug_frame(skb);
 634 #endif
 635 
 636         desc = desc_address(port, port->txin, 1);
 637         buff = buffer_offset(port, port->txin, 1);
 638         len = skb->len;
 639         page = buff / winsize(card);
 640         buff = buff % winsize(card);
 641         maxlen = winsize(card) - buff;
 642 
 643         openwin(card, page);
 644         if (len > maxlen) {
 645                 memcpy_toio(winbase(card) + buff, skb->data, maxlen);
 646                 openwin(card, page + 1);
 647                 memcpy_toio(winbase(card), skb->data + maxlen, len - maxlen);
 648         } else
 649                 memcpy_toio(winbase(card) + buff, skb->data, len);
 650 
 651 #ifndef PAGE0_ALWAYS_MAPPED
 652         openwin(card, 0);       /* select pkt_desc table page back */
 653 #endif
 654         writew(len, &desc->len);
 655         writeb(ST_TX_EOM, &desc->stat);
 656 
 657         port->txin = next_desc(port, port->txin, 1);
 658         sca_outw(desc_offset(port, port->txin, 1),
 659                  get_dmac_tx(port) + EDAL, card);
 660 
 661         sca_out(DSR_DE, DSR_TX(phy_node(port)), card); /* Enable TX DMA */
 662 
 663         desc = desc_address(port, port->txin + 1, 1);
 664         if (readb(&desc->stat)) /* allow 1 packet gap */
 665                 netif_stop_queue(dev);
 666 
 667         spin_unlock_irq(&port->lock);
 668 
 669         dev_kfree_skb(skb);
 670         return NETDEV_TX_OK;
 671 }
 672 
 673 
 674 #ifdef NEED_DETECT_RAM
 675 static u32 sca_detect_ram(card_t *card, u8 __iomem *rambase, u32 ramsize)
 676 {
 677         /* Round RAM size to 32 bits, fill from end to start */
 678         u32 i = ramsize &= ~3;
 679         u32 size = winsize(card);
 680 
 681         openwin(card, (i - 4) / size); /* select last window */
 682 
 683         do {
 684                 i -= 4;
 685                 if ((i + 4) % size == 0)
 686                         openwin(card, i / size);
 687                 writel(i ^ 0x12345678, rambase + i % size);
 688         } while (i > 0);
 689 
 690         for (i = 0; i < ramsize ; i += 4) {
 691                 if (i % size == 0)
 692                         openwin(card, i / size);
 693 
 694                 if (readl(rambase + i % size) != (i ^ 0x12345678))
 695                         break;
 696         }
 697 
 698         return i;
 699 }
 700 #endif /* NEED_DETECT_RAM */
 701 
 702 
 703 static void sca_init(card_t *card, int wait_states)
 704 {
 705         sca_out(wait_states, WCRL, card); /* Wait Control */
 706         sca_out(wait_states, WCRM, card);
 707         sca_out(wait_states, WCRH, card);
 708 
 709         sca_out(0, DMER, card); /* DMA Master disable */
 710         sca_out(0x03, PCR, card); /* DMA priority */
 711         sca_out(0, DSR_RX(0), card); /* DMA disable - to halt state */
 712         sca_out(0, DSR_TX(0), card);
 713         sca_out(0, DSR_RX(1), card);
 714         sca_out(0, DSR_TX(1), card);
 715         sca_out(DMER_DME, DMER, card); /* DMA Master enable */
 716 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/net/wan/hd64570.c

DEFINITIONS
