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 * SPDX-License-Identifier: GPL-2.0+
17 #define PCNET_DEBUG_LEVEL 0 /* 0=off, 1=init, 2=rx/tx */
19 #define PCNET_DEBUG1(fmt,args...) \
20 debug_cond(PCNET_DEBUG_LEVEL > 0, fmt ,##args)
21 #define PCNET_DEBUG2(fmt,args...) \
22 debug_cond(PCNET_DEBUG_LEVEL > 1, fmt ,##args)
24 #if !defined(CONF_PCNET_79C973) && defined(CONF_PCNET_79C975)
25 #error "Macro for PCnet chip version is not defined!"
29 * Set the number of Tx and Rx buffers, using Log_2(# buffers).
30 * Reasonable default values are 4 Tx buffers, and 16 Rx buffers.
31 * That translates to 2 (4 == 2^^2) and 4 (16 == 2^^4).
33 #define PCNET_LOG_TX_BUFFERS 0
34 #define PCNET_LOG_RX_BUFFERS 2
36 #define TX_RING_SIZE (1 << (PCNET_LOG_TX_BUFFERS))
37 #define TX_RING_LEN_BITS ((PCNET_LOG_TX_BUFFERS) << 12)
39 #define RX_RING_SIZE (1 << (PCNET_LOG_RX_BUFFERS))
40 #define RX_RING_LEN_BITS ((PCNET_LOG_RX_BUFFERS) << 4)
42 #define PKT_BUF_SZ 1544
44 /* The PCNET Rx and Tx ring descriptors. */
45 struct pcnet_rx_head {
53 struct pcnet_tx_head {
61 /* The PCNET 32-Bit initialization block, described in databook. */
62 struct pcnet_init_block {
68 /* Receive and transmit ring base, along with extra bits. */
74 struct pcnet_uncached_priv {
75 struct pcnet_rx_head rx_ring[RX_RING_SIZE];
76 struct pcnet_tx_head tx_ring[TX_RING_SIZE];
77 struct pcnet_init_block init_block;
80 typedef struct pcnet_priv {
81 struct pcnet_uncached_priv *uc;
82 /* Receive Buffer space */
83 unsigned char (*rx_buf)[RX_RING_SIZE][PKT_BUF_SZ + 4];
88 static pcnet_priv_t *lp;
90 /* Offsets from base I/O address for WIO mode */
91 #define PCNET_RDP 0x10
92 #define PCNET_RAP 0x12
93 #define PCNET_RESET 0x14
94 #define PCNET_BDP 0x16
96 static u16 pcnet_read_csr(struct eth_device *dev, int index)
98 outw(index, dev->iobase + PCNET_RAP);
99 return inw(dev->iobase + PCNET_RDP);
102 static void pcnet_write_csr(struct eth_device *dev, int index, u16 val)
104 outw(index, dev->iobase + PCNET_RAP);
105 outw(val, dev->iobase + PCNET_RDP);
108 static u16 pcnet_read_bcr(struct eth_device *dev, int index)
110 outw(index, dev->iobase + PCNET_RAP);
111 return inw(dev->iobase + PCNET_BDP);
114 static void pcnet_write_bcr(struct eth_device *dev, int index, u16 val)
116 outw(index, dev->iobase + PCNET_RAP);
117 outw(val, dev->iobase + PCNET_BDP);
120 static void pcnet_reset(struct eth_device *dev)
122 inw(dev->iobase + PCNET_RESET);
125 static int pcnet_check(struct eth_device *dev)
127 outw(88, dev->iobase + PCNET_RAP);
128 return inw(dev->iobase + PCNET_RAP) == 88;
131 static int pcnet_init (struct eth_device *dev, bd_t * bis);
132 static int pcnet_send(struct eth_device *dev, void *packet, int length);
133 static int pcnet_recv (struct eth_device *dev);
134 static void pcnet_halt (struct eth_device *dev);
135 static int pcnet_probe (struct eth_device *dev, bd_t * bis, int dev_num);
137 #define PCI_TO_MEM(d, a) pci_virt_to_mem((pci_dev_t)d->priv, (a))
138 #define PCI_TO_MEM_LE(d,a) (u32)(cpu_to_le32(PCI_TO_MEM(d,a)))
140 static struct pci_device_id supported[] = {
141 {PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LANCE},
146 int pcnet_initialize(bd_t *bis)
149 struct eth_device *dev;
153 PCNET_DEBUG1("\npcnet_initialize...\n");
155 for (dev_nr = 0;; dev_nr++) {
158 * Find the PCnet PCI device(s).
160 devbusfn = pci_find_devices(supported, dev_nr);
165 * Allocate and pre-fill the device structure.
167 dev = (struct eth_device *)malloc(sizeof(*dev));
169 printf("pcnet: Can not allocate memory\n");
172 memset(dev, 0, sizeof(*dev));
173 dev->priv = (void *)devbusfn;
174 sprintf(dev->name, "pcnet#%d", dev_nr);
177 * Setup the PCI device.
179 pci_read_config_dword(devbusfn, PCI_BASE_ADDRESS_0,
180 (unsigned int *)&dev->iobase);
181 dev->iobase = pci_io_to_phys(devbusfn, dev->iobase);
184 PCNET_DEBUG1("%s: devbusfn=0x%x iobase=0x%x: ",
185 dev->name, devbusfn, dev->iobase);
187 command = PCI_COMMAND_IO | PCI_COMMAND_MASTER;
188 pci_write_config_word(devbusfn, PCI_COMMAND, command);
189 pci_read_config_word(devbusfn, PCI_COMMAND, &status);
190 if ((status & command) != command) {
191 printf("%s: Couldn't enable IO access or Bus Mastering\n",
197 pci_write_config_byte(devbusfn, PCI_LATENCY_TIMER, 0x40);
200 * Probe the PCnet chip.
202 if (pcnet_probe(dev, bis, dev_nr) < 0) {
208 * Setup device structure and register the driver.
210 dev->init = pcnet_init;
211 dev->halt = pcnet_halt;
212 dev->send = pcnet_send;
213 dev->recv = pcnet_recv;
223 static int pcnet_probe(struct eth_device *dev, bd_t *bis, int dev_nr)
228 #ifdef PCNET_HAS_PROM
232 /* Reset the PCnet controller */
235 /* Check if register access is working */
236 if (pcnet_read_csr(dev, 0) != 4 || !pcnet_check(dev)) {
237 printf("%s: CSR register access check failed\n", dev->name);
241 /* Identify the chip */
243 pcnet_read_csr(dev, 88) | (pcnet_read_csr(dev, 89) << 16);
244 if ((chip_version & 0xfff) != 0x003)
246 chip_version = (chip_version >> 12) & 0xffff;
247 switch (chip_version) {
249 chipname = "PCnet/PCI II 79C970A"; /* PCI */
251 #ifdef CONFIG_PCNET_79C973
253 chipname = "PCnet/FAST III 79C973"; /* PCI */
256 #ifdef CONFIG_PCNET_79C975
258 chipname = "PCnet/FAST III 79C975"; /* PCI */
262 printf("%s: PCnet version %#x not supported\n",
263 dev->name, chip_version);
267 PCNET_DEBUG1("AMD %s\n", chipname);
269 #ifdef PCNET_HAS_PROM
271 * In most chips, after a chip reset, the ethernet address is read from
272 * the station address PROM at the base address and programmed into the
273 * "Physical Address Registers" CSR12-14.
275 for (i = 0; i < 3; i++) {
278 val = pcnet_read_csr(dev, i + 12) & 0x0ffff;
279 /* There may be endianness issues here. */
280 dev->enetaddr[2 * i] = val & 0x0ff;
281 dev->enetaddr[2 * i + 1] = (val >> 8) & 0x0ff;
283 #endif /* PCNET_HAS_PROM */
288 static int pcnet_init(struct eth_device *dev, bd_t *bis)
290 struct pcnet_uncached_priv *uc;
294 PCNET_DEBUG1("%s: pcnet_init...\n", dev->name);
296 /* Switch pcnet to 32bit mode */
297 pcnet_write_bcr(dev, 20, 2);
299 /* Set/reset autoselect bit */
300 val = pcnet_read_bcr(dev, 2) & ~2;
302 pcnet_write_bcr(dev, 2, val);
304 /* Enable auto negotiate, setup, disable fd */
305 val = pcnet_read_bcr(dev, 32) & ~0x98;
307 pcnet_write_bcr(dev, 32, val);
310 * Enable NOUFLO on supported controllers, with the transmit
311 * start point set to the full packet. This will cause entire
312 * packets to be buffered by the ethernet controller before
313 * transmission, eliminating underflows which are common on
314 * slower devices. Controllers which do not support NOUFLO will
315 * simply be left with a larger transmit FIFO threshold.
317 val = pcnet_read_bcr(dev, 18);
319 pcnet_write_bcr(dev, 18, val);
320 val = pcnet_read_csr(dev, 80);
322 pcnet_write_csr(dev, 80, val);
325 * We only maintain one structure because the drivers will never
326 * be used concurrently. In 32bit mode the RX and TX ring entries
327 * must be aligned on 16-byte boundaries.
330 addr = (u32)malloc(sizeof(pcnet_priv_t) + 0x10);
331 addr = (addr + 0xf) & ~0xf;
332 lp = (pcnet_priv_t *)addr;
334 addr = (u32)memalign(ARCH_DMA_MINALIGN, sizeof(*lp->uc));
335 flush_dcache_range(addr, addr + sizeof(*lp->uc));
336 addr = UNCACHED_SDRAM(addr);
337 lp->uc = (struct pcnet_uncached_priv *)addr;
339 addr = (u32)memalign(ARCH_DMA_MINALIGN, sizeof(*lp->rx_buf));
340 flush_dcache_range(addr, addr + sizeof(*lp->rx_buf));
341 lp->rx_buf = (void *)addr;
346 uc->init_block.mode = cpu_to_le16(0x0000);
347 uc->init_block.filter[0] = 0x00000000;
348 uc->init_block.filter[1] = 0x00000000;
351 * Initialize the Rx ring.
354 for (i = 0; i < RX_RING_SIZE; i++) {
355 uc->rx_ring[i].base = PCI_TO_MEM_LE(dev, (*lp->rx_buf)[i]);
356 uc->rx_ring[i].buf_length = cpu_to_le16(-PKT_BUF_SZ);
357 uc->rx_ring[i].status = cpu_to_le16(0x8000);
359 ("Rx%d: base=0x%x buf_length=0x%hx status=0x%hx\n", i,
360 uc->rx_ring[i].base, uc->rx_ring[i].buf_length,
361 uc->rx_ring[i].status);
365 * Initialize the Tx ring. The Tx buffer address is filled in as
366 * needed, but we do need to clear the upper ownership bit.
369 for (i = 0; i < TX_RING_SIZE; i++) {
370 uc->tx_ring[i].base = 0;
371 uc->tx_ring[i].status = 0;
377 PCNET_DEBUG1("Init block at 0x%p: MAC", &lp->uc->init_block);
379 for (i = 0; i < 6; i++) {
380 lp->uc->init_block.phys_addr[i] = dev->enetaddr[i];
381 PCNET_DEBUG1(" %02x", lp->uc->init_block.phys_addr[i]);
384 uc->init_block.tlen_rlen = cpu_to_le16(TX_RING_LEN_BITS |
386 uc->init_block.rx_ring = PCI_TO_MEM_LE(dev, uc->rx_ring);
387 uc->init_block.tx_ring = PCI_TO_MEM_LE(dev, uc->tx_ring);
389 PCNET_DEBUG1("\ntlen_rlen=0x%x rx_ring=0x%x tx_ring=0x%x\n",
390 uc->init_block.tlen_rlen,
391 uc->init_block.rx_ring, uc->init_block.tx_ring);
394 * Tell the controller where the Init Block is located.
397 addr = PCI_TO_MEM(dev, &lp->uc->init_block);
398 pcnet_write_csr(dev, 1, addr & 0xffff);
399 pcnet_write_csr(dev, 2, (addr >> 16) & 0xffff);
401 pcnet_write_csr(dev, 4, 0x0915);
402 pcnet_write_csr(dev, 0, 0x0001); /* start */
404 /* Wait for Init Done bit */
405 for (i = 10000; i > 0; i--) {
406 if (pcnet_read_csr(dev, 0) & 0x0100)
411 printf("%s: TIMEOUT: controller init failed\n", dev->name);
417 * Finally start network controller operation.
419 pcnet_write_csr(dev, 0, 0x0002);
424 static int pcnet_send(struct eth_device *dev, void *packet, int pkt_len)
427 struct pcnet_tx_head *entry = &lp->uc->tx_ring[lp->cur_tx];
429 PCNET_DEBUG2("Tx%d: %d bytes from 0x%p ", lp->cur_tx, pkt_len,
432 flush_dcache_range((unsigned long)packet,
433 (unsigned long)packet + pkt_len);
435 /* Wait for completion by testing the OWN bit */
436 for (i = 1000; i > 0; i--) {
437 status = readw(&entry->status);
438 if ((status & 0x8000) == 0)
444 printf("%s: TIMEOUT: Tx%d failed (status = 0x%x)\n",
445 dev->name, lp->cur_tx, status);
451 * Setup Tx ring. Caution: the write order is important here,
452 * set the status with the "ownership" bits last.
454 writew(-pkt_len, &entry->length);
455 writel(0, &entry->misc);
456 writel(PCI_TO_MEM(dev, packet), &entry->base);
457 writew(0x8300, &entry->status);
459 /* Trigger an immediate send poll. */
460 pcnet_write_csr(dev, 0, 0x0008);
463 if (++lp->cur_tx >= TX_RING_SIZE)
466 PCNET_DEBUG2("done\n");
470 static int pcnet_recv (struct eth_device *dev)
472 struct pcnet_rx_head *entry;
475 u16 status, err_status;
478 entry = &lp->uc->rx_ring[lp->cur_rx];
480 * If we own the next entry, it's a new packet. Send it up.
482 status = readw(&entry->status);
483 if ((status & 0x8000) != 0)
485 err_status = status >> 8;
487 if (err_status != 0x03) { /* There was an error. */
488 printf("%s: Rx%d", dev->name, lp->cur_rx);
489 PCNET_DEBUG1(" (status=0x%x)", err_status);
490 if (err_status & 0x20)
492 if (err_status & 0x10)
494 if (err_status & 0x08)
496 if (err_status & 0x04)
502 pkt_len = (readl(&entry->msg_length) & 0xfff) - 4;
504 printf("%s: Rx%d: invalid packet length %d\n",
505 dev->name, lp->cur_rx, pkt_len);
507 buf = (*lp->rx_buf)[lp->cur_rx];
508 invalidate_dcache_range((unsigned long)buf,
509 (unsigned long)buf + pkt_len);
510 net_process_received_packet(buf, pkt_len);
511 PCNET_DEBUG2("Rx%d: %d bytes from 0x%p\n",
512 lp->cur_rx, pkt_len, buf);
517 writew(status, &entry->status);
519 if (++lp->cur_rx >= RX_RING_SIZE)
525 static void pcnet_halt(struct eth_device *dev)
529 PCNET_DEBUG1("%s: pcnet_halt...\n", dev->name);
531 /* Reset the PCnet controller */
534 /* Wait for Stop bit */
535 for (i = 1000; i > 0; i--) {
536 if (pcnet_read_csr(dev, 0) & 0x4)
541 printf("%s: TIMEOUT: controller reset failed\n", dev->name);