1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2002 Wolfgang Grandegger, wg@denx.de.
5 * This driver for AMD PCnet network controllers is derived from the
6 * Linux driver pcnet32.c written 1996-1999 by Thomas Bogendoerfer.
16 #include <asm/cache.h>
19 #include <linux/delay.h>
21 #define PCNET_DEBUG_LEVEL 0 /* 0=off, 1=init, 2=rx/tx */
23 #define PCNET_DEBUG1(fmt,args...) \
24 debug_cond(PCNET_DEBUG_LEVEL > 0, fmt ,##args)
25 #define PCNET_DEBUG2(fmt,args...) \
26 debug_cond(PCNET_DEBUG_LEVEL > 1, fmt ,##args)
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;
78 } __aligned(ARCH_DMA_MINALIGN);
81 struct pcnet_uncached_priv ucp;
82 /* Receive Buffer space */
83 unsigned char rx_buf[RX_RING_SIZE][PKT_BUF_SZ + 4];
84 struct pcnet_uncached_priv *uc;
90 static struct pcnet_priv *lp;
92 /* Offsets from base I/O address for WIO mode */
93 #define PCNET_RDP 0x10
94 #define PCNET_RAP 0x12
95 #define PCNET_RESET 0x14
96 #define PCNET_BDP 0x16
98 static u16 pcnet_read_csr(struct eth_device *dev, int index)
100 void __iomem *base = (void __iomem *)dev->iobase;
102 writew(index, base + PCNET_RAP);
103 return readw(base + PCNET_RDP);
106 static void pcnet_write_csr(struct eth_device *dev, int index, u16 val)
108 void __iomem *base = (void __iomem *)dev->iobase;
110 writew(index, base + PCNET_RAP);
111 writew(val, base + PCNET_RDP);
114 static u16 pcnet_read_bcr(struct eth_device *dev, int index)
116 void __iomem *base = (void __iomem *)dev->iobase;
118 writew(index, base + PCNET_RAP);
119 return readw(base + PCNET_BDP);
122 static void pcnet_write_bcr(struct eth_device *dev, int index, u16 val)
124 void __iomem *base = (void __iomem *)dev->iobase;
126 writew(index, base + PCNET_RAP);
127 writew(val, base + PCNET_BDP);
130 static void pcnet_reset(struct eth_device *dev)
132 void __iomem *base = (void __iomem *)dev->iobase;
134 readw(base + PCNET_RESET);
137 static int pcnet_check(struct eth_device *dev)
139 void __iomem *base = (void __iomem *)dev->iobase;
141 writew(88, base + PCNET_RAP);
142 return readw(base + PCNET_RAP) == 88;
145 static inline pci_addr_t pcnet_virt_to_mem(struct pcnet_priv *lp, void *addr)
147 void *virt_addr = addr;
149 return pci_virt_to_mem(lp->dev, virt_addr);
152 static struct pci_device_id supported[] = {
153 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LANCE) },
157 static int pcnet_probe(struct eth_device *dev, bd_t *bis, int dev_nr)
163 /* Reset the PCnet controller */
166 /* Check if register access is working */
167 if (pcnet_read_csr(dev, 0) != 4 || !pcnet_check(dev)) {
168 printf("%s: CSR register access check failed\n", dev->name);
172 /* Identify the chip */
174 pcnet_read_csr(dev, 88) | (pcnet_read_csr(dev, 89) << 16);
175 if ((chip_version & 0xfff) != 0x003)
177 chip_version = (chip_version >> 12) & 0xffff;
178 switch (chip_version) {
180 chipname = "PCnet/PCI II 79C970A"; /* PCI */
183 chipname = "PCnet/FAST III 79C973"; /* PCI */
186 chipname = "PCnet/FAST III 79C975"; /* PCI */
189 printf("%s: PCnet version %#x not supported\n",
190 dev->name, chip_version);
194 PCNET_DEBUG1("AMD %s\n", chipname);
197 * In most chips, after a chip reset, the ethernet address is read from
198 * the station address PROM at the base address and programmed into the
199 * "Physical Address Registers" CSR12-14.
201 for (i = 0; i < 3; i++) {
204 val = pcnet_read_csr(dev, i + 12) & 0x0ffff;
205 /* There may be endianness issues here. */
206 dev->enetaddr[2 * i] = val & 0x0ff;
207 dev->enetaddr[2 * i + 1] = (val >> 8) & 0x0ff;
213 static int pcnet_init(struct eth_device *dev, bd_t *bis)
215 struct pcnet_uncached_priv *uc;
219 PCNET_DEBUG1("%s: pcnet_init...\n", dev->name);
221 /* Switch pcnet to 32bit mode */
222 pcnet_write_bcr(dev, 20, 2);
224 /* Set/reset autoselect bit */
225 val = pcnet_read_bcr(dev, 2) & ~2;
227 pcnet_write_bcr(dev, 2, val);
229 /* Enable auto negotiate, setup, disable fd */
230 val = pcnet_read_bcr(dev, 32) & ~0x98;
232 pcnet_write_bcr(dev, 32, val);
235 * Enable NOUFLO on supported controllers, with the transmit
236 * start point set to the full packet. This will cause entire
237 * packets to be buffered by the ethernet controller before
238 * transmission, eliminating underflows which are common on
239 * slower devices. Controllers which do not support NOUFLO will
240 * simply be left with a larger transmit FIFO threshold.
242 val = pcnet_read_bcr(dev, 18);
244 pcnet_write_bcr(dev, 18, val);
245 val = pcnet_read_csr(dev, 80);
247 pcnet_write_csr(dev, 80, val);
251 uc->init_block.mode = cpu_to_le16(0x0000);
252 uc->init_block.filter[0] = 0x00000000;
253 uc->init_block.filter[1] = 0x00000000;
256 * Initialize the Rx ring.
259 for (i = 0; i < RX_RING_SIZE; i++) {
260 addr = pcnet_virt_to_mem(lp, lp->rx_buf[i]);
261 uc->rx_ring[i].base = cpu_to_le32(addr);
262 uc->rx_ring[i].buf_length = cpu_to_le16(-PKT_BUF_SZ);
263 uc->rx_ring[i].status = cpu_to_le16(0x8000);
265 ("Rx%d: base=0x%x buf_length=0x%hx status=0x%hx\n", i,
266 uc->rx_ring[i].base, uc->rx_ring[i].buf_length,
267 uc->rx_ring[i].status);
271 * Initialize the Tx ring. The Tx buffer address is filled in as
272 * needed, but we do need to clear the upper ownership bit.
275 for (i = 0; i < TX_RING_SIZE; i++) {
276 uc->tx_ring[i].base = 0;
277 uc->tx_ring[i].status = 0;
283 PCNET_DEBUG1("Init block at 0x%p: MAC", &lp->uc->init_block);
285 for (i = 0; i < 6; i++) {
286 lp->uc->init_block.phys_addr[i] = dev->enetaddr[i];
287 PCNET_DEBUG1(" %02x", lp->uc->init_block.phys_addr[i]);
290 uc->init_block.tlen_rlen = cpu_to_le16(TX_RING_LEN_BITS |
292 addr = pcnet_virt_to_mem(lp, uc->rx_ring);
293 uc->init_block.rx_ring = cpu_to_le32(addr);
294 addr = pcnet_virt_to_mem(lp, uc->tx_ring);
295 uc->init_block.tx_ring = cpu_to_le32(addr);
297 PCNET_DEBUG1("\ntlen_rlen=0x%x rx_ring=0x%x tx_ring=0x%x\n",
298 uc->init_block.tlen_rlen,
299 uc->init_block.rx_ring, uc->init_block.tx_ring);
302 * Tell the controller where the Init Block is located.
305 addr = pcnet_virt_to_mem(lp, &lp->uc->init_block);
306 pcnet_write_csr(dev, 1, addr & 0xffff);
307 pcnet_write_csr(dev, 2, (addr >> 16) & 0xffff);
309 pcnet_write_csr(dev, 4, 0x0915);
310 pcnet_write_csr(dev, 0, 0x0001); /* start */
312 /* Wait for Init Done bit */
313 for (i = 10000; i > 0; i--) {
314 if (pcnet_read_csr(dev, 0) & 0x0100)
319 printf("%s: TIMEOUT: controller init failed\n", dev->name);
325 * Finally start network controller operation.
327 pcnet_write_csr(dev, 0, 0x0002);
332 static int pcnet_send(struct eth_device *dev, void *packet, int pkt_len)
336 struct pcnet_tx_head *entry = &lp->uc->tx_ring[lp->cur_tx];
338 PCNET_DEBUG2("Tx%d: %d bytes from 0x%p ", lp->cur_tx, pkt_len,
341 flush_dcache_range((unsigned long)packet,
342 (unsigned long)packet + pkt_len);
344 /* Wait for completion by testing the OWN bit */
345 for (i = 1000; i > 0; i--) {
346 status = readw(&entry->status);
347 if ((status & 0x8000) == 0)
353 printf("%s: TIMEOUT: Tx%d failed (status = 0x%x)\n",
354 dev->name, lp->cur_tx, status);
360 * Setup Tx ring. Caution: the write order is important here,
361 * set the status with the "ownership" bits last.
363 addr = pcnet_virt_to_mem(lp, packet);
364 writew(-pkt_len, &entry->length);
365 writel(0, &entry->misc);
366 writel(addr, &entry->base);
367 writew(0x8300, &entry->status);
369 /* Trigger an immediate send poll. */
370 pcnet_write_csr(dev, 0, 0x0008);
373 if (++lp->cur_tx >= TX_RING_SIZE)
376 PCNET_DEBUG2("done\n");
380 static int pcnet_recv (struct eth_device *dev)
382 struct pcnet_rx_head *entry;
385 u16 status, err_status;
388 entry = &lp->uc->rx_ring[lp->cur_rx];
390 * If we own the next entry, it's a new packet. Send it up.
392 status = readw(&entry->status);
393 if ((status & 0x8000) != 0)
395 err_status = status >> 8;
397 if (err_status != 0x03) { /* There was an error. */
398 printf("%s: Rx%d", dev->name, lp->cur_rx);
399 PCNET_DEBUG1(" (status=0x%x)", err_status);
400 if (err_status & 0x20)
402 if (err_status & 0x10)
404 if (err_status & 0x08)
406 if (err_status & 0x04)
412 pkt_len = (readl(&entry->msg_length) & 0xfff) - 4;
414 printf("%s: Rx%d: invalid packet length %d\n",
415 dev->name, lp->cur_rx, pkt_len);
417 buf = lp->rx_buf[lp->cur_rx];
418 invalidate_dcache_range((unsigned long)buf,
419 (unsigned long)buf + pkt_len);
420 net_process_received_packet(buf, pkt_len);
421 PCNET_DEBUG2("Rx%d: %d bytes from 0x%p\n",
422 lp->cur_rx, pkt_len, buf);
427 writew(status, &entry->status);
429 if (++lp->cur_rx >= RX_RING_SIZE)
435 static void pcnet_halt(struct eth_device *dev)
439 PCNET_DEBUG1("%s: pcnet_halt...\n", dev->name);
441 /* Reset the PCnet controller */
444 /* Wait for Stop bit */
445 for (i = 1000; i > 0; i--) {
446 if (pcnet_read_csr(dev, 0) & 0x4)
451 printf("%s: TIMEOUT: controller reset failed\n", dev->name);
454 int pcnet_initialize(bd_t *bis)
457 struct eth_device *dev;
462 PCNET_DEBUG1("\npcnet_initialize...\n");
464 for (dev_nr = 0; ; dev_nr++) {
466 * Find the PCnet PCI device(s).
468 devbusfn = pci_find_devices(supported, dev_nr);
473 * Allocate and pre-fill the device structure.
475 dev = calloc(1, sizeof(*dev));
477 printf("pcnet: Can not allocate memory\n");
482 * We only maintain one structure because the drivers will
483 * never be used concurrently. In 32bit mode the RX and TX
484 * ring entries must be aligned on 16-byte boundaries.
487 lp = malloc_cache_aligned(sizeof(*lp));
488 lp->uc = map_physmem((phys_addr_t)&lp->ucp,
489 sizeof(lp->ucp), MAP_NOCACHE);
490 flush_dcache_range((unsigned long)lp,
491 (unsigned long)lp + sizeof(*lp));
495 sprintf(dev->name, "pcnet#%d", dev_nr);
498 * Setup the PCI device.
500 pci_read_config_dword(devbusfn, PCI_BASE_ADDRESS_1, &bar);
501 dev->iobase = pci_mem_to_phys(devbusfn, bar);
504 PCNET_DEBUG1("%s: devbusfn=0x%x iobase=0x%lx: ",
505 dev->name, devbusfn, (unsigned long)dev->iobase);
507 command = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
508 pci_write_config_word(devbusfn, PCI_COMMAND, command);
509 pci_read_config_word(devbusfn, PCI_COMMAND, &status);
510 if ((status & command) != command) {
511 printf("%s: Couldn't enable IO access or Bus Mastering\n",
517 pci_write_config_byte(devbusfn, PCI_LATENCY_TIMER, 0x40);
520 * Probe the PCnet chip.
522 if (pcnet_probe(dev, bis, dev_nr) < 0) {
528 * Setup device structure and register the driver.
530 dev->init = pcnet_init;
531 dev->halt = pcnet_halt;
532 dev->send = pcnet_send;
533 dev->recv = pcnet_recv;