2 natsemi.c: A U-Boot driver for the NatSemi DP8381x series.
3 Author: Mark A. Rakes (mark_rakes@vivato.net)
5 Adapted from an Etherboot driver written by:
7 Copyright (C) 2001 Entity Cyber, Inc.
9 This development of this Etherboot driver was funded by
11 Sicom Systems: http://www.sicompos.com/
13 Author: Marty Connor (mdc@thinguin.org)
14 Adapted from a Linux driver which was written by Donald Becker
16 This software may be used and distributed according to the terms
17 of the GNU Public License (GPL), incorporated herein by reference.
19 Original Copyright Notice:
21 Written/copyright 1999-2001 by Donald Becker.
23 This software may be used and distributed according to the terms of
24 the GNU General Public License (GPL), incorporated herein by reference.
25 Drivers based on or derived from this code fall under the GPL and must
26 retain the authorship, copyright and license notice. This file is not
27 a complete program and may only be used when the entire operating
28 system is licensed under the GPL. License for under other terms may be
29 available. Contact the original author for details.
31 The original author may be reached as becker@scyld.com, or at
32 Scyld Computing Corporation
33 410 Severn Ave., Suite 210
36 Support information and updates available at
37 http://www.scyld.com/network/netsemi.html
40 http://www.scyld.com/expert/100mbps.html
41 http://www.scyld.com/expert/NWay.html
42 Datasheet is available from:
43 http://www.national.com/pf/DP/DP83815.html
47 * October 2002 mar 1.0
48 * Initial U-Boot Release. Tested with Netgear FA311 board
49 * and dp83815 chipset on custom board
61 #define EEPROM_SIZE 0xb /*12 16-bit chunks, or 24 bytes*/
63 #define DSIZE 0x00000FFF
66 #define TOUT_LOOP 500000
67 #define TX_BUF_SIZE 1536
68 #define RX_BUF_SIZE 1536
69 #define NUM_RX_DESC 4 /* Number of Rx descriptor registers. */
71 /* Offsets to the device registers.
72 Unlike software-only systems, device drivers interact with complex hardware.
73 It's not useful to define symbolic names for every register bit in the
75 enum register_offsets {
92 /* These are from the spec, around page 78... on a separate table. */
100 /* Bit in ChipCmd. */
111 enum ChipConfigBits {
112 LinkSts = 0x80000000,
113 HundSpeed = 0x40000000,
114 FullDuplex = 0x20000000,
115 TenPolarity = 0x10000000,
116 AnegDone = 0x08000000,
117 AnegEnBothBoth = 0x0000E000,
118 AnegDis100Full = 0x0000C000,
119 AnegEn100Both = 0x0000A000,
120 AnegDis100Half = 0x00008000,
121 AnegEnBothHalf = 0x00006000,
122 AnegDis10Full = 0x00004000,
123 AnegEn10Both = 0x00002000,
124 DuplexMask = 0x00008000,
125 SpeedMask = 0x00004000,
126 AnegMask = 0x00002000,
127 AnegDis10Half = 0x00000000,
131 BootRomDisable = 0x00000004,
138 TxMxdmaMask = 0x700000,
140 TxMxdma_4 = 0x100000,
141 TxMxdma_8 = 0x200000,
142 TxMxdma_16 = 0x300000,
143 TxMxdma_32 = 0x400000,
144 TxMxdma_64 = 0x500000,
145 TxMxdma_128 = 0x600000,
146 TxMxdma_256 = 0x700000,
147 TxCollRetry = 0x800000,
148 TxAutoPad = 0x10000000,
149 TxMacLoop = 0x20000000,
150 TxHeartIgn = 0x40000000,
151 TxCarrierIgn = 0x80000000
156 RxMxdmaMask = 0x700000,
158 RxMxdma_4 = 0x100000,
159 RxMxdma_8 = 0x200000,
160 RxMxdma_16 = 0x300000,
161 RxMxdma_32 = 0x400000,
162 RxMxdma_64 = 0x500000,
163 RxMxdma_128 = 0x600000,
164 RxMxdma_256 = 0x700000,
165 RxAcceptLong = 0x8000000,
166 RxAcceptTx = 0x10000000,
167 RxAcceptRunt = 0x40000000,
168 RxAcceptErr = 0x80000000
171 /* Bits in the RxMode register. */
175 AcceptBroadcast = 0xC0000000,
176 AcceptMulticast = 0x00200000,
177 AcceptAllMulticast = 0x20000000,
178 AcceptAllPhys = 0x10000000,
179 AcceptMyPhys = 0x08000000
182 typedef struct _BufferDesc {
189 /* Bits in network_desc.status */
190 enum desc_status_bits {
191 DescOwn = 0x80000000, DescMore = 0x40000000, DescIntr = 0x20000000,
192 DescNoCRC = 0x10000000, DescPktOK = 0x08000000,
193 DescSizeMask = 0xfff,
195 DescTxAbort = 0x04000000, DescTxFIFO = 0x02000000,
196 DescTxCarrier = 0x01000000, DescTxDefer = 0x00800000,
197 DescTxExcDefer = 0x00400000, DescTxOOWCol = 0x00200000,
198 DescTxExcColl = 0x00100000, DescTxCollCount = 0x000f0000,
200 DescRxAbort = 0x04000000, DescRxOver = 0x02000000,
201 DescRxDest = 0x01800000, DescRxLong = 0x00400000,
202 DescRxRunt = 0x00200000, DescRxInvalid = 0x00100000,
203 DescRxCRC = 0x00080000, DescRxAlign = 0x00040000,
204 DescRxLoop = 0x00020000, DesRxColl = 0x00010000,
209 static int natsemi_debug = 0; /* 1 verbose debugging, 0 normal */
211 static u32 SavedClkRun;
212 static unsigned int cur_rx;
213 static unsigned int advertising;
214 static unsigned int rx_config;
215 static unsigned int tx_config;
217 /* Note: transmit and receive buffers and descriptors must be
219 static BufferDesc txd __attribute__ ((aligned(4)));
220 static BufferDesc rxd[NUM_RX_DESC] __attribute__ ((aligned(4)));
222 static unsigned char txb[TX_BUF_SIZE] __attribute__ ((aligned(4)));
223 static unsigned char rxb[NUM_RX_DESC * RX_BUF_SIZE]
224 __attribute__ ((aligned(4)));
226 /* Function Prototypes */
228 static void write_eeprom(struct eth_device *dev, long addr, int location,
231 static int read_eeprom(struct eth_device *dev, long addr, int location);
232 static int mdio_read(struct eth_device *dev, int phy_id, int location);
233 static int natsemi_init(struct eth_device *dev, bd_t * bis);
234 static void natsemi_reset(struct eth_device *dev);
235 static void natsemi_init_rxfilter(struct eth_device *dev);
236 static void natsemi_init_txd(struct eth_device *dev);
237 static void natsemi_init_rxd(struct eth_device *dev);
238 static void natsemi_set_rx_mode(struct eth_device *dev);
239 static void natsemi_check_duplex(struct eth_device *dev);
240 static int natsemi_send(struct eth_device *dev, volatile void *packet,
242 static int natsemi_poll(struct eth_device *dev);
243 static void natsemi_disable(struct eth_device *dev);
245 static struct pci_device_id supported[] = {
246 {PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_83815},
250 #define bus_to_phys(a) pci_mem_to_phys((pci_dev_t)dev->priv, a)
251 #define phys_to_bus(a) pci_phys_to_mem((pci_dev_t)dev->priv, a)
254 INW(struct eth_device *dev, u_long addr)
256 return le16_to_cpu(*(vu_short *) (addr + dev->iobase));
260 INL(struct eth_device *dev, u_long addr)
262 return le32_to_cpu(*(vu_long *) (addr + dev->iobase));
266 OUTW(struct eth_device *dev, int command, u_long addr)
268 *(vu_short *) ((addr + dev->iobase)) = cpu_to_le16(command);
272 OUTL(struct eth_device *dev, int command, u_long addr)
274 *(vu_long *) ((addr + dev->iobase)) = cpu_to_le32(command);
278 * Function: natsemi_initialize
280 * Description: Retrieves the MAC address of the card, and sets up some
281 * globals required by other routines, and initializes the NIC, making it
282 * ready to send and receive packets.
285 * leaves the natsemi initialized, and ready to recieve packets.
287 * Returns: struct eth_device *: pointer to NIC data structure
291 natsemi_initialize(bd_t * bis)
295 struct eth_device *dev;
296 u32 iobase, status, chip_config;
302 /* Find PCI device(s) */
303 if ((devno = pci_find_devices(supported, idx++)) < 0) {
307 pci_read_config_dword(devno, PCI_BASE_ADDRESS_0, &iobase);
308 iobase &= ~0x3; /* bit 1: unused and bit 0: I/O Space Indicator */
310 pci_write_config_dword(devno, PCI_COMMAND,
311 PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
313 /* Check if I/O accesses and Bus Mastering are enabled. */
314 pci_read_config_dword(devno, PCI_COMMAND, &status);
315 if (!(status & PCI_COMMAND_MEMORY)) {
316 printf("Error: Can not enable MEM access.\n");
318 } else if (!(status & PCI_COMMAND_MASTER)) {
319 printf("Error: Can not enable Bus Mastering.\n");
323 dev = (struct eth_device *) malloc(sizeof *dev);
325 sprintf(dev->name, "dp83815#%d", card_number);
326 dev->iobase = bus_to_phys(iobase);
328 printf("natsemi: NatSemi ns8381[56] @ %#x\n", dev->iobase);
330 dev->priv = (void *) devno;
331 dev->init = natsemi_init;
332 dev->halt = natsemi_disable;
333 dev->send = natsemi_send;
334 dev->recv = natsemi_poll;
340 /* Set the latency timer for value. */
341 pci_write_config_byte(devno, PCI_LATENCY_TIMER, 0x20);
345 /* natsemi has a non-standard PM control register
346 * in PCI config space. Some boards apparently need
347 * to be brought to D0 in this manner. */
348 pci_read_config_dword(devno, PCIPM, &tmp);
349 if (tmp & (0x03 | 0x100)) {
350 /* D0 state, disable PME assertion */
351 u32 newtmp = tmp & ~(0x03 | 0x100);
352 pci_write_config_dword(devno, PCIPM, newtmp);
355 printf("natsemi: EEPROM contents:\n");
356 for (i = 0; i <= EEPROM_SIZE; i++) {
357 short eedata = read_eeprom(dev, EECtrl, i);
358 printf(" %04hx", eedata);
362 /* get MAC address */
363 prev_eedata = read_eeprom(dev, EECtrl, 6);
364 for (i = 0; i < 3; i++) {
365 int eedata = read_eeprom(dev, EECtrl, i + 7);
366 dev->enetaddr[i*2] = (eedata << 1) + (prev_eedata >> 15);
367 dev->enetaddr[i*2+1] = eedata >> 7;
368 prev_eedata = eedata;
371 /* Reset the chip to erase any previous misconfiguration. */
372 OUTL(dev, ChipReset, ChipCmd);
374 advertising = mdio_read(dev, 1, 4);
375 chip_config = INL(dev, ChipConfig);
377 printf("%s: Transceiver status %#08X advertising %#08X\n",
378 dev->name, (int) INL(dev, BasicStatus), advertising);
379 printf("%s: Transceiver default autoneg. %s 10%s %s duplex.\n",
380 dev->name, chip_config & AnegMask ? "enabled, advertise" :
381 "disabled, force", chip_config & SpeedMask ? "0" : "",
382 chip_config & DuplexMask ? "full" : "half");
384 chip_config |= AnegEnBothBoth;
386 printf("%s: changed to autoneg. %s 10%s %s duplex.\n",
387 dev->name, chip_config & AnegMask ? "enabled, advertise" :
388 "disabled, force", chip_config & SpeedMask ? "0" : "",
389 chip_config & DuplexMask ? "full" : "half");
391 /*write new autoneg bits, reset phy*/
392 OUTL(dev, (chip_config | PhyRst), ChipConfig);
394 OUTL(dev, chip_config, ChipConfig);
397 * The PME bit is initialized from the EEPROM contents.
398 * PCI cards probably have PME disabled, but motherboard
399 * implementations may have PME set to enable WakeOnLan.
400 * With PME set the chip will scan incoming packets but
401 * nothing will be written to memory. */
402 SavedClkRun = INL(dev, ClkRun);
403 OUTL(dev, SavedClkRun & ~0x100, ClkRun);
408 /* Read the EEPROM and MII Management Data I/O (MDIO) interfaces.
409 The EEPROM code is for common 93c06/46 EEPROMs w/ 6bit addresses. */
411 /* Delay between EEPROM clock transitions.
412 No extra delay is needed with 33MHz PCI, but future 66MHz
413 access may need a delay. */
414 #define eeprom_delay(ee_addr) INL(dev, ee_addr)
416 enum EEPROM_Ctrl_Bits {
419 EE_ChipSelect = 0x08,
423 #define EE_Write0 (EE_ChipSelect)
424 #define EE_Write1 (EE_ChipSelect | EE_DataIn)
425 /* The EEPROM commands include the alway-set leading bit. */
427 EE_WrEnCmd = (4 << 6), EE_WriteCmd = (5 << 6),
428 EE_ReadCmd = (6 << 6), EE_EraseCmd = (7 << 6),
433 write_eeprom(struct eth_device *dev, long addr, int location, short value)
436 int ee_addr = (typeof(ee_addr))addr;
437 short wren_cmd = EE_WrEnCmd | 0x30; /*wren is 100 + 11XXXX*/
438 short write_cmd = location | EE_WriteCmd;
441 printf("write_eeprom: %08x, %04hx, %04hx\n",
442 dev->iobase + ee_addr, write_cmd, value);
444 /* Shift the write enable command bits out. */
445 for (i = 9; i >= 0; i--) {
446 short cmdval = (wren_cmd & (1 << i)) ? EE_Write1 : EE_Write0;
447 OUTL(dev, cmdval, ee_addr);
448 eeprom_delay(ee_addr);
449 OUTL(dev, cmdval | EE_ShiftClk, ee_addr);
450 eeprom_delay(ee_addr);
453 OUTL(dev, 0, ee_addr); /*bring chip select low*/
454 OUTL(dev, EE_ShiftClk, ee_addr);
455 eeprom_delay(ee_addr);
457 /* Shift the write command bits out. */
458 for (i = 9; i >= 0; i--) {
459 short cmdval = (write_cmd & (1 << i)) ? EE_Write1 : EE_Write0;
460 OUTL(dev, cmdval, ee_addr);
461 eeprom_delay(ee_addr);
462 OUTL(dev, cmdval | EE_ShiftClk, ee_addr);
463 eeprom_delay(ee_addr);
466 for (i = 0; i < 16; i++) {
467 short cmdval = (value & (1 << i)) ? EE_Write1 : EE_Write0;
468 OUTL(dev, cmdval, ee_addr);
469 eeprom_delay(ee_addr);
470 OUTL(dev, cmdval | EE_ShiftClk, ee_addr);
471 eeprom_delay(ee_addr);
474 OUTL(dev, 0, ee_addr); /*bring chip select low*/
475 OUTL(dev, EE_ShiftClk, ee_addr);
476 for (i = 0; i < 200000; i++) {
477 OUTL(dev, EE_Write0, ee_addr); /*poll for done*/
478 if (INL(dev, ee_addr) & EE_DataOut) {
482 eeprom_delay(ee_addr);
484 /* Terminate the EEPROM access. */
485 OUTL(dev, EE_Write0, ee_addr);
486 OUTL(dev, 0, ee_addr);
492 read_eeprom(struct eth_device *dev, long addr, int location)
496 int ee_addr = (typeof(ee_addr))addr;
497 int read_cmd = location | EE_ReadCmd;
499 OUTL(dev, EE_Write0, ee_addr);
501 /* Shift the read command bits out. */
502 for (i = 10; i >= 0; i--) {
503 short dataval = (read_cmd & (1 << i)) ? EE_Write1 : EE_Write0;
504 OUTL(dev, dataval, ee_addr);
505 eeprom_delay(ee_addr);
506 OUTL(dev, dataval | EE_ShiftClk, ee_addr);
507 eeprom_delay(ee_addr);
509 OUTL(dev, EE_ChipSelect, ee_addr);
510 eeprom_delay(ee_addr);
512 for (i = 0; i < 16; i++) {
513 OUTL(dev, EE_ChipSelect | EE_ShiftClk, ee_addr);
514 eeprom_delay(ee_addr);
515 retval |= (INL(dev, ee_addr) & EE_DataOut) ? 1 << i : 0;
516 OUTL(dev, EE_ChipSelect, ee_addr);
517 eeprom_delay(ee_addr);
520 /* Terminate the EEPROM access. */
521 OUTL(dev, EE_Write0, ee_addr);
522 OUTL(dev, 0, ee_addr);
525 printf("read_eeprom: %08x, %08x, retval %08x\n",
526 dev->iobase + ee_addr, read_cmd, retval);
531 /* MII transceiver control section.
532 The 83815 series has an internal transceiver, and we present the
533 management registers as if they were MII connected. */
536 mdio_read(struct eth_device *dev, int phy_id, int location)
538 if (phy_id == 1 && location < 32)
539 return INL(dev, BasicControl+(location<<2))&0xffff;
544 /* Function: natsemi_init
546 * Description: resets the ethernet controller chip and configures
547 * registers and data structures required for sending and receiving packets.
549 * Arguments: struct eth_device *dev: NIC data structure
555 natsemi_init(struct eth_device *dev, bd_t * bis)
561 * The PME bit is initialized from the EEPROM contents.
562 * PCI cards probably have PME disabled, but motherboard
563 * implementations may have PME set to enable WakeOnLan.
564 * With PME set the chip will scan incoming packets but
565 * nothing will be written to memory. */
566 OUTL(dev, SavedClkRun & ~0x100, ClkRun);
568 natsemi_init_rxfilter(dev);
569 natsemi_init_txd(dev);
570 natsemi_init_rxd(dev);
572 /* Configure the PCI bus bursts and FIFO thresholds. */
573 tx_config = TxAutoPad | TxCollRetry | TxMxdma_256 | (0x1002);
574 rx_config = RxMxdma_256 | 0x20;
577 printf("%s: Setting TxConfig Register %#08X\n", dev->name, tx_config);
578 printf("%s: Setting RxConfig Register %#08X\n", dev->name, rx_config);
580 OUTL(dev, tx_config, TxConfig);
581 OUTL(dev, rx_config, RxConfig);
583 natsemi_check_duplex(dev);
584 natsemi_set_rx_mode(dev);
586 OUTL(dev, (RxOn | TxOn), ChipCmd);
591 * Function: natsemi_reset
593 * Description: soft resets the controller chip
595 * Arguments: struct eth_device *dev: NIC data structure
600 natsemi_reset(struct eth_device *dev)
602 OUTL(dev, ChipReset, ChipCmd);
604 /* On page 78 of the spec, they recommend some settings for "optimum
605 performance" to be done in sequence. These settings optimize some
606 of the 100Mbit autodetection circuitry. Also, we only want to do
607 this for rev C of the chip. */
608 if (INL(dev, SiliconRev) == 0x302) {
609 OUTW(dev, 0x0001, PGSEL);
610 OUTW(dev, 0x189C, PMDCSR);
611 OUTW(dev, 0x0000, TSTDAT);
612 OUTW(dev, 0x5040, DSPCFG);
613 OUTW(dev, 0x008C, SDCFG);
615 /* Disable interrupts using the mask. */
616 OUTL(dev, 0, IntrMask);
617 OUTL(dev, 0, IntrEnable);
620 /* Function: natsemi_init_rxfilter
622 * Description: sets receive filter address to our MAC address
624 * Arguments: struct eth_device *dev: NIC data structure
630 natsemi_init_rxfilter(struct eth_device *dev)
634 for (i = 0; i < ETH_ALEN; i += 2) {
635 OUTL(dev, i, RxFilterAddr);
636 OUTW(dev, dev->enetaddr[i] + (dev->enetaddr[i + 1] << 8),
642 * Function: natsemi_init_txd
644 * Description: initializes the Tx descriptor
646 * Arguments: struct eth_device *dev: NIC data structure
652 natsemi_init_txd(struct eth_device *dev)
655 txd.cmdsts = (u32) 0;
656 txd.bufptr = (u32) & txb[0];
658 /* load Transmit Descriptor Register */
659 OUTL(dev, (u32) & txd, TxRingPtr);
661 printf("natsemi_init_txd: TX descriptor reg loaded with: %#08X\n",
662 INL(dev, TxRingPtr));
666 /* Function: natsemi_init_rxd
668 * Description: initializes the Rx descriptor ring
670 * Arguments: struct eth_device *dev: NIC data structure
676 natsemi_init_rxd(struct eth_device *dev)
682 /* init RX descriptor */
683 for (i = 0; i < NUM_RX_DESC; i++) {
686 NUM_RX_DESC) ? (u32) & rxd[i +
689 rxd[i].cmdsts = cpu_to_le32((u32) RX_BUF_SIZE);
690 rxd[i].bufptr = cpu_to_le32((u32) & rxb[i * RX_BUF_SIZE]);
693 ("natsemi_init_rxd: rxd[%d]=%p link=%X cmdsts=%lX bufptr=%X\n",
694 i, &rxd[i], le32_to_cpu(rxd[i].link),
695 rxd[i].cmdsts, rxd[i].bufptr);
699 /* load Receive Descriptor Register */
700 OUTL(dev, (u32) & rxd[0], RxRingPtr);
703 printf("natsemi_init_rxd: RX descriptor register loaded with: %X\n",
704 INL(dev, RxRingPtr));
708 /* Function: natsemi_set_rx_mode
711 * sets the receive mode to accept all broadcast packets and packets
712 * with our MAC address, and reject all multicast packets.
714 * Arguments: struct eth_device *dev: NIC data structure
720 natsemi_set_rx_mode(struct eth_device *dev)
722 u32 rx_mode = AcceptBroadcast | AcceptMyPhys;
724 OUTL(dev, rx_mode, RxFilterAddr);
728 natsemi_check_duplex(struct eth_device *dev)
730 int duplex = INL(dev, ChipConfig) & FullDuplex ? 1 : 0;
733 printf("%s: Setting %s-duplex based on negotiated link"
734 " capability.\n", dev->name, duplex ? "full" : "half");
737 rx_config |= RxAcceptTx;
738 tx_config |= (TxCarrierIgn | TxHeartIgn);
740 rx_config &= ~RxAcceptTx;
741 tx_config &= ~(TxCarrierIgn | TxHeartIgn);
743 OUTL(dev, tx_config, TxConfig);
744 OUTL(dev, rx_config, RxConfig);
747 /* Function: natsemi_send
749 * Description: transmits a packet and waits for completion or timeout.
753 natsemi_send(struct eth_device *dev, volatile void *packet, int length)
757 vu_long *res = (vu_long *)&tx_status;
759 /* Stop the transmitter */
760 OUTL(dev, TxOff, ChipCmd);
764 printf("natsemi_send: sending %d bytes\n", (int) length);
767 /* set the transmit buffer descriptor and enable Transmit State Machine */
768 txd.link = cpu_to_le32(0);
769 txd.bufptr = cpu_to_le32(phys_to_bus((u32) packet));
770 txd.cmdsts = cpu_to_le32(DescOwn | length);
772 /* load Transmit Descriptor Register */
773 OUTL(dev, phys_to_bus((u32) & txd), TxRingPtr);
776 printf("natsemi_send: TX descriptor register loaded with: %#08X\n",
777 INL(dev, TxRingPtr));
779 /* restart the transmitter */
780 OUTL(dev, TxOn, ChipCmd);
783 (*res = le32_to_cpu(txd.cmdsts)) & DescOwn;
785 if (i >= TOUT_LOOP) {
787 ("%s: tx error buffer not ready: txd.cmdsts == %#X\n",
788 dev->name, tx_status);
793 if (!(tx_status & DescPktOK)) {
794 printf("natsemi_send: Transmit error, Tx status %X.\n",
804 /* Function: natsemi_poll
806 * Description: checks for a received packet and returns it if found.
808 * Arguments: struct eth_device *dev: NIC data structure
810 * Returns: 1 if packet was received.
811 * 0 if no packet was received.
814 * Returns (copies) the packet to the array dev->packet.
815 * Returns the length of the packet.
819 natsemi_poll(struct eth_device *dev)
823 u32 rx_status = le32_to_cpu(rxd[cur_rx].cmdsts);
825 if (!(rx_status & (u32) DescOwn))
829 printf("natsemi_poll: got a packet: cur_rx:%d, status:%X\n",
832 length = (rx_status & DSIZE) - CRC_SIZE;
834 if ((rx_status & (DescMore | DescPktOK | DescRxLong)) != DescPktOK) {
836 ("natsemi_poll: Corrupted packet received, buffer status = %X\n",
839 } else { /* give packet to higher level routine */
840 NetReceive((rxb + cur_rx * RX_BUF_SIZE), length);
844 /* return the descriptor and buffer to receive ring */
845 rxd[cur_rx].cmdsts = cpu_to_le32(RX_BUF_SIZE);
846 rxd[cur_rx].bufptr = cpu_to_le32((u32) & rxb[cur_rx * RX_BUF_SIZE]);
848 if (++cur_rx == NUM_RX_DESC)
851 /* re-enable the potentially idle receive state machine */
852 OUTL(dev, RxOn, ChipCmd);
857 /* Function: natsemi_disable
859 * Description: Turns off interrupts and stops Tx and Rx engines
861 * Arguments: struct eth_device *dev: NIC data structure
867 natsemi_disable(struct eth_device *dev)
869 /* Disable interrupts using the mask. */
870 OUTL(dev, 0, IntrMask);
871 OUTL(dev, 0, IntrEnable);
873 /* Stop the chip's Tx and Rx processes. */
874 OUTL(dev, RxOff | TxOff, ChipCmd);
876 /* Restore PME enable bit */
877 OUTL(dev, SavedClkRun, ClkRun);