2 * (C) Copyright 2002 Wolfgang Grandegger, wg@denx.de.
4 * This driver for AMD PCnet network controllers is derived from the
5 * Linux driver pcnet32.c written 1996-1999 by Thomas Bogendoerfer.
7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
33 #define PCNET_DEBUG_LEVEL 0 /* 0=off, 1=init, 2=rx/tx */
35 #define PCNET_DEBUG1(fmt,args...) \
36 debug_cond(PCNET_DEBUG_LEVEL > 0, fmt ,##args)
37 #define PCNET_DEBUG2(fmt,args...) \
38 debug_cond(PCNET_DEBUG_LEVEL > 1, fmt ,##args)
40 #if !defined(CONF_PCNET_79C973) && defined(CONF_PCNET_79C975)
41 #error "Macro for PCnet chip version is not defined!"
45 * Set the number of Tx and Rx buffers, using Log_2(# buffers).
46 * Reasonable default values are 4 Tx buffers, and 16 Rx buffers.
47 * That translates to 2 (4 == 2^^2) and 4 (16 == 2^^4).
49 #define PCNET_LOG_TX_BUFFERS 0
50 #define PCNET_LOG_RX_BUFFERS 2
52 #define TX_RING_SIZE (1 << (PCNET_LOG_TX_BUFFERS))
53 #define TX_RING_LEN_BITS ((PCNET_LOG_TX_BUFFERS) << 12)
55 #define RX_RING_SIZE (1 << (PCNET_LOG_RX_BUFFERS))
56 #define RX_RING_LEN_BITS ((PCNET_LOG_RX_BUFFERS) << 4)
58 #define PKT_BUF_SZ 1544
60 /* The PCNET Rx and Tx ring descriptors. */
61 struct pcnet_rx_head {
69 struct pcnet_tx_head {
77 /* The PCNET 32-Bit initialization block, described in databook. */
78 struct pcnet_init_block {
84 /* Receive and transmit ring base, along with extra bits. */
90 typedef struct pcnet_priv {
91 struct pcnet_rx_head rx_ring[RX_RING_SIZE];
92 struct pcnet_tx_head tx_ring[TX_RING_SIZE];
93 struct pcnet_init_block init_block;
94 /* Receive Buffer space */
95 unsigned char rx_buf[RX_RING_SIZE][PKT_BUF_SZ + 4];
100 static pcnet_priv_t *lp;
102 /* Offsets from base I/O address for WIO mode */
103 #define PCNET_RDP 0x10
104 #define PCNET_RAP 0x12
105 #define PCNET_RESET 0x14
106 #define PCNET_BDP 0x16
108 static u16 pcnet_read_csr (struct eth_device *dev, int index)
110 outw (index, dev->iobase + PCNET_RAP);
111 return inw (dev->iobase + PCNET_RDP);
114 static void pcnet_write_csr (struct eth_device *dev, int index, u16 val)
116 outw (index, dev->iobase + PCNET_RAP);
117 outw (val, dev->iobase + PCNET_RDP);
120 static u16 pcnet_read_bcr (struct eth_device *dev, int index)
122 outw (index, dev->iobase + PCNET_RAP);
123 return inw (dev->iobase + PCNET_BDP);
126 static void pcnet_write_bcr (struct eth_device *dev, int index, u16 val)
128 outw (index, dev->iobase + PCNET_RAP);
129 outw (val, dev->iobase + PCNET_BDP);
132 static void pcnet_reset (struct eth_device *dev)
134 inw (dev->iobase + PCNET_RESET);
137 static int pcnet_check (struct eth_device *dev)
139 outw (88, dev->iobase + PCNET_RAP);
140 return (inw (dev->iobase + PCNET_RAP) == 88);
143 static int pcnet_init (struct eth_device *dev, bd_t * bis);
144 static int pcnet_send(struct eth_device *dev, void *packet, int length);
145 static int pcnet_recv (struct eth_device *dev);
146 static void pcnet_halt (struct eth_device *dev);
147 static int pcnet_probe (struct eth_device *dev, bd_t * bis, int dev_num);
149 #define PCI_TO_MEM(d,a) pci_phys_to_mem((pci_dev_t)d->priv, (u_long)(a))
150 #define PCI_TO_MEM_LE(d,a) (u32)(cpu_to_le32(PCI_TO_MEM(d,a)))
152 static struct pci_device_id supported[] = {
153 {PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LANCE},
158 int pcnet_initialize (bd_t * bis)
161 struct eth_device *dev;
165 PCNET_DEBUG1 ("\npcnet_initialize...\n");
167 for (dev_nr = 0;; dev_nr++) {
170 * Find the PCnet PCI device(s).
172 if ((devbusfn = pci_find_devices (supported, dev_nr)) < 0) {
177 * Allocate and pre-fill the device structure.
179 dev = (struct eth_device *) malloc (sizeof *dev);
181 printf("pcnet: Can not allocate memory\n");
184 memset(dev, 0, sizeof(*dev));
185 dev->priv = (void *) devbusfn;
186 sprintf (dev->name, "pcnet#%d", dev_nr);
189 * Setup the PCI device.
191 pci_read_config_dword (devbusfn, PCI_BASE_ADDRESS_0,
192 (unsigned int *) &dev->iobase);
193 dev->iobase=pci_io_to_phys (devbusfn, dev->iobase);
196 PCNET_DEBUG1 ("%s: devbusfn=0x%x iobase=0x%x: ",
197 dev->name, devbusfn, dev->iobase);
199 command = PCI_COMMAND_IO | PCI_COMMAND_MASTER;
200 pci_write_config_word (devbusfn, PCI_COMMAND, command);
201 pci_read_config_word (devbusfn, PCI_COMMAND, &status);
202 if ((status & command) != command) {
203 printf ("%s: Couldn't enable IO access or Bus Mastering\n", dev->name);
208 pci_write_config_byte (devbusfn, PCI_LATENCY_TIMER, 0x40);
211 * Probe the PCnet chip.
213 if (pcnet_probe (dev, bis, dev_nr) < 0) {
219 * Setup device structure and register the driver.
221 dev->init = pcnet_init;
222 dev->halt = pcnet_halt;
223 dev->send = pcnet_send;
224 dev->recv = pcnet_recv;
234 static int pcnet_probe (struct eth_device *dev, bd_t * bis, int dev_nr)
239 #ifdef PCNET_HAS_PROM
243 /* Reset the PCnet controller */
246 /* Check if register access is working */
247 if (pcnet_read_csr (dev, 0) != 4 || !pcnet_check (dev)) {
248 printf ("%s: CSR register access check failed\n", dev->name);
252 /* Identify the chip */
254 pcnet_read_csr (dev, 88) | (pcnet_read_csr (dev, 89) << 16);
255 if ((chip_version & 0xfff) != 0x003)
257 chip_version = (chip_version >> 12) & 0xffff;
258 switch (chip_version) {
260 chipname = "PCnet/PCI II 79C970A"; /* PCI */
262 #ifdef CONFIG_PCNET_79C973
264 chipname = "PCnet/FAST III 79C973"; /* PCI */
267 #ifdef CONFIG_PCNET_79C975
269 chipname = "PCnet/FAST III 79C975"; /* PCI */
273 printf ("%s: PCnet version %#x not supported\n",
274 dev->name, chip_version);
278 PCNET_DEBUG1 ("AMD %s\n", chipname);
280 #ifdef PCNET_HAS_PROM
282 * In most chips, after a chip reset, the ethernet address is read from
283 * the station address PROM at the base address and programmed into the
284 * "Physical Address Registers" CSR12-14.
286 for (i = 0; i < 3; i++) {
289 val = pcnet_read_csr (dev, i + 12) & 0x0ffff;
290 /* There may be endianness issues here. */
291 dev->enetaddr[2 * i] = val & 0x0ff;
292 dev->enetaddr[2 * i + 1] = (val >> 8) & 0x0ff;
294 #endif /* PCNET_HAS_PROM */
299 static int pcnet_init (struct eth_device *dev, bd_t * bis)
304 PCNET_DEBUG1 ("%s: pcnet_init...\n", dev->name);
306 /* Switch pcnet to 32bit mode */
307 pcnet_write_bcr (dev, 20, 2);
310 /* Setup LED registers */
311 val = pcnet_read_bcr (dev, 2) | 0x1000;
312 pcnet_write_bcr (dev, 2, val); /* enable LEDPE */
313 pcnet_write_bcr (dev, 4, 0x5080); /* 100MBit */
314 pcnet_write_bcr (dev, 5, 0x40c0); /* LNKSE */
315 pcnet_write_bcr (dev, 6, 0x4090); /* TX Activity */
316 pcnet_write_bcr (dev, 7, 0x4084); /* RX Activity */
319 /* Set/reset autoselect bit */
320 val = pcnet_read_bcr (dev, 2) & ~2;
322 pcnet_write_bcr (dev, 2, val);
324 /* Enable auto negotiate, setup, disable fd */
325 val = pcnet_read_bcr (dev, 32) & ~0x98;
327 pcnet_write_bcr (dev, 32, val);
330 * We only maintain one structure because the drivers will never
331 * be used concurrently. In 32bit mode the RX and TX ring entries
332 * must be aligned on 16-byte boundaries.
335 addr = (u32) malloc (sizeof (pcnet_priv_t) + 0x10);
336 addr = (addr + 0xf) & ~0xf;
337 lp = (pcnet_priv_t *) addr;
340 lp->init_block.mode = cpu_to_le16 (0x0000);
341 lp->init_block.filter[0] = 0x00000000;
342 lp->init_block.filter[1] = 0x00000000;
345 * Initialize the Rx ring.
348 for (i = 0; i < RX_RING_SIZE; i++) {
349 lp->rx_ring[i].base = PCI_TO_MEM_LE (dev, lp->rx_buf[i]);
350 lp->rx_ring[i].buf_length = cpu_to_le16 (-PKT_BUF_SZ);
351 lp->rx_ring[i].status = cpu_to_le16 (0x8000);
353 ("Rx%d: base=0x%x buf_length=0x%hx status=0x%hx\n", i,
354 lp->rx_ring[i].base, lp->rx_ring[i].buf_length,
355 lp->rx_ring[i].status);
359 * Initialize the Tx ring. The Tx buffer address is filled in as
360 * needed, but we do need to clear the upper ownership bit.
363 for (i = 0; i < TX_RING_SIZE; i++) {
364 lp->tx_ring[i].base = 0;
365 lp->tx_ring[i].status = 0;
371 PCNET_DEBUG1 ("Init block at 0x%p: MAC", &lp->init_block);
373 for (i = 0; i < 6; i++) {
374 lp->init_block.phys_addr[i] = dev->enetaddr[i];
375 PCNET_DEBUG1 (" %02x", lp->init_block.phys_addr[i]);
378 lp->init_block.tlen_rlen = cpu_to_le16 (TX_RING_LEN_BITS |
380 lp->init_block.rx_ring = PCI_TO_MEM_LE (dev, lp->rx_ring);
381 lp->init_block.tx_ring = PCI_TO_MEM_LE (dev, lp->tx_ring);
383 PCNET_DEBUG1 ("\ntlen_rlen=0x%x rx_ring=0x%x tx_ring=0x%x\n",
384 lp->init_block.tlen_rlen,
385 lp->init_block.rx_ring, lp->init_block.tx_ring);
388 * Tell the controller where the Init Block is located.
390 addr = PCI_TO_MEM (dev, &lp->init_block);
391 pcnet_write_csr (dev, 1, addr & 0xffff);
392 pcnet_write_csr (dev, 2, (addr >> 16) & 0xffff);
394 pcnet_write_csr (dev, 4, 0x0915);
395 pcnet_write_csr (dev, 0, 0x0001); /* start */
397 /* Wait for Init Done bit */
398 for (i = 10000; i > 0; i--) {
399 if (pcnet_read_csr (dev, 0) & 0x0100)
404 printf ("%s: TIMEOUT: controller init failed\n", dev->name);
410 * Finally start network controller operation.
412 pcnet_write_csr (dev, 0, 0x0002);
417 static int pcnet_send(struct eth_device *dev, void *packet, int pkt_len)
420 struct pcnet_tx_head *entry = &lp->tx_ring[lp->cur_tx];
422 PCNET_DEBUG2 ("Tx%d: %d bytes from 0x%p ", lp->cur_tx, pkt_len,
425 /* Wait for completion by testing the OWN bit */
426 for (i = 1000; i > 0; i--) {
427 status = le16_to_cpu (entry->status);
428 if ((status & 0x8000) == 0)
434 printf ("%s: TIMEOUT: Tx%d failed (status = 0x%x)\n",
435 dev->name, lp->cur_tx, status);
441 * Setup Tx ring. Caution: the write order is important here,
442 * set the status with the "ownership" bits last.
445 entry->length = le16_to_cpu (-pkt_len);
446 entry->misc = 0x00000000;
447 entry->base = PCI_TO_MEM_LE (dev, packet);
448 entry->status = le16_to_cpu (status);
450 /* Trigger an immediate send poll. */
451 pcnet_write_csr (dev, 0, 0x0008);
454 if (++lp->cur_tx >= TX_RING_SIZE)
457 PCNET_DEBUG2 ("done\n");
461 static int pcnet_recv (struct eth_device *dev)
463 struct pcnet_rx_head *entry;
468 entry = &lp->rx_ring[lp->cur_rx];
470 * If we own the next entry, it's a new packet. Send it up.
472 if (((status = le16_to_cpu (entry->status)) & 0x8000) != 0) {
477 if (status != 0x03) { /* There was an error. */
479 printf ("%s: Rx%d", dev->name, lp->cur_rx);
480 PCNET_DEBUG1 (" (status=0x%x)", status);
484 printf (" Overflow");
490 entry->status &= le16_to_cpu (0x03ff);
495 (le32_to_cpu (entry->msg_length) & 0xfff) - 4;
497 printf ("%s: Rx%d: invalid packet length %d\n", dev->name, lp->cur_rx, pkt_len);
499 NetReceive (lp->rx_buf[lp->cur_rx], pkt_len);
500 PCNET_DEBUG2 ("Rx%d: %d bytes from 0x%p\n",
502 lp->rx_buf[lp->cur_rx]);
505 entry->status |= cpu_to_le16 (0x8000);
507 if (++lp->cur_rx >= RX_RING_SIZE)
513 static void pcnet_halt (struct eth_device *dev)
517 PCNET_DEBUG1 ("%s: pcnet_halt...\n", dev->name);
519 /* Reset the PCnet controller */
522 /* Wait for Stop bit */
523 for (i = 1000; i > 0; i--) {
524 if (pcnet_read_csr (dev, 0) & 0x4)
529 printf ("%s: TIMEOUT: controller reset failed\n", dev->name);