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 typedef struct pcnet_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 /* Receive Buffer space */
79 unsigned char rx_buf[RX_RING_SIZE][PKT_BUF_SZ + 4];
84 static pcnet_priv_t *lp;
86 /* Offsets from base I/O address for WIO mode */
87 #define PCNET_RDP 0x10
88 #define PCNET_RAP 0x12
89 #define PCNET_RESET 0x14
90 #define PCNET_BDP 0x16
92 static u16 pcnet_read_csr (struct eth_device *dev, int index)
94 outw (index, dev->iobase + PCNET_RAP);
95 return inw (dev->iobase + PCNET_RDP);
98 static void pcnet_write_csr (struct eth_device *dev, int index, u16 val)
100 outw (index, dev->iobase + PCNET_RAP);
101 outw (val, dev->iobase + PCNET_RDP);
104 static u16 pcnet_read_bcr (struct eth_device *dev, int index)
106 outw (index, dev->iobase + PCNET_RAP);
107 return inw (dev->iobase + PCNET_BDP);
110 static void pcnet_write_bcr (struct eth_device *dev, int index, u16 val)
112 outw (index, dev->iobase + PCNET_RAP);
113 outw (val, dev->iobase + PCNET_BDP);
116 static void pcnet_reset (struct eth_device *dev)
118 inw (dev->iobase + PCNET_RESET);
121 static int pcnet_check (struct eth_device *dev)
123 outw (88, dev->iobase + PCNET_RAP);
124 return (inw (dev->iobase + PCNET_RAP) == 88);
127 static int pcnet_init (struct eth_device *dev, bd_t * bis);
128 static int pcnet_send(struct eth_device *dev, void *packet, int length);
129 static int pcnet_recv (struct eth_device *dev);
130 static void pcnet_halt (struct eth_device *dev);
131 static int pcnet_probe (struct eth_device *dev, bd_t * bis, int dev_num);
133 #define PCI_TO_MEM(d, a) pci_virt_to_mem((pci_dev_t)d->priv, (a))
134 #define PCI_TO_MEM_LE(d,a) (u32)(cpu_to_le32(PCI_TO_MEM(d,a)))
136 static struct pci_device_id supported[] = {
137 {PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LANCE},
142 int pcnet_initialize (bd_t * bis)
145 struct eth_device *dev;
149 PCNET_DEBUG1 ("\npcnet_initialize...\n");
151 for (dev_nr = 0;; dev_nr++) {
154 * Find the PCnet PCI device(s).
156 if ((devbusfn = pci_find_devices (supported, dev_nr)) < 0) {
161 * Allocate and pre-fill the device structure.
163 dev = (struct eth_device *) malloc (sizeof *dev);
165 printf("pcnet: Can not allocate memory\n");
168 memset(dev, 0, sizeof(*dev));
169 dev->priv = (void *) devbusfn;
170 sprintf (dev->name, "pcnet#%d", dev_nr);
173 * Setup the PCI device.
175 pci_read_config_dword (devbusfn, PCI_BASE_ADDRESS_0,
176 (unsigned int *) &dev->iobase);
177 dev->iobase=pci_io_to_phys (devbusfn, dev->iobase);
180 PCNET_DEBUG1 ("%s: devbusfn=0x%x iobase=0x%x: ",
181 dev->name, devbusfn, dev->iobase);
183 command = PCI_COMMAND_IO | PCI_COMMAND_MASTER;
184 pci_write_config_word (devbusfn, PCI_COMMAND, command);
185 pci_read_config_word (devbusfn, PCI_COMMAND, &status);
186 if ((status & command) != command) {
187 printf ("%s: Couldn't enable IO access or Bus Mastering\n", dev->name);
192 pci_write_config_byte (devbusfn, PCI_LATENCY_TIMER, 0x40);
195 * Probe the PCnet chip.
197 if (pcnet_probe (dev, bis, dev_nr) < 0) {
203 * Setup device structure and register the driver.
205 dev->init = pcnet_init;
206 dev->halt = pcnet_halt;
207 dev->send = pcnet_send;
208 dev->recv = pcnet_recv;
218 static int pcnet_probe (struct eth_device *dev, bd_t * bis, int dev_nr)
223 #ifdef PCNET_HAS_PROM
227 /* Reset the PCnet controller */
230 /* Check if register access is working */
231 if (pcnet_read_csr (dev, 0) != 4 || !pcnet_check (dev)) {
232 printf ("%s: CSR register access check failed\n", dev->name);
236 /* Identify the chip */
238 pcnet_read_csr (dev, 88) | (pcnet_read_csr (dev, 89) << 16);
239 if ((chip_version & 0xfff) != 0x003)
241 chip_version = (chip_version >> 12) & 0xffff;
242 switch (chip_version) {
244 chipname = "PCnet/PCI II 79C970A"; /* PCI */
246 #ifdef CONFIG_PCNET_79C973
248 chipname = "PCnet/FAST III 79C973"; /* PCI */
251 #ifdef CONFIG_PCNET_79C975
253 chipname = "PCnet/FAST III 79C975"; /* PCI */
257 printf ("%s: PCnet version %#x not supported\n",
258 dev->name, chip_version);
262 PCNET_DEBUG1 ("AMD %s\n", chipname);
264 #ifdef PCNET_HAS_PROM
266 * In most chips, after a chip reset, the ethernet address is read from
267 * the station address PROM at the base address and programmed into the
268 * "Physical Address Registers" CSR12-14.
270 for (i = 0; i < 3; i++) {
273 val = pcnet_read_csr (dev, i + 12) & 0x0ffff;
274 /* There may be endianness issues here. */
275 dev->enetaddr[2 * i] = val & 0x0ff;
276 dev->enetaddr[2 * i + 1] = (val >> 8) & 0x0ff;
278 #endif /* PCNET_HAS_PROM */
283 static int pcnet_init (struct eth_device *dev, bd_t * bis)
288 PCNET_DEBUG1 ("%s: pcnet_init...\n", dev->name);
290 /* Switch pcnet to 32bit mode */
291 pcnet_write_bcr (dev, 20, 2);
294 /* Setup LED registers */
295 val = pcnet_read_bcr (dev, 2) | 0x1000;
296 pcnet_write_bcr (dev, 2, val); /* enable LEDPE */
297 pcnet_write_bcr (dev, 4, 0x5080); /* 100MBit */
298 pcnet_write_bcr (dev, 5, 0x40c0); /* LNKSE */
299 pcnet_write_bcr (dev, 6, 0x4090); /* TX Activity */
300 pcnet_write_bcr (dev, 7, 0x4084); /* RX Activity */
303 /* Set/reset autoselect bit */
304 val = pcnet_read_bcr (dev, 2) & ~2;
306 pcnet_write_bcr (dev, 2, val);
308 /* Enable auto negotiate, setup, disable fd */
309 val = pcnet_read_bcr (dev, 32) & ~0x98;
311 pcnet_write_bcr (dev, 32, val);
314 * We only maintain one structure because the drivers will never
315 * be used concurrently. In 32bit mode the RX and TX ring entries
316 * must be aligned on 16-byte boundaries.
319 addr = (u32) malloc (sizeof (pcnet_priv_t) + 0x10);
320 addr = (addr + 0xf) & ~0xf;
321 lp = (pcnet_priv_t *) addr;
324 lp->init_block.mode = cpu_to_le16 (0x0000);
325 lp->init_block.filter[0] = 0x00000000;
326 lp->init_block.filter[1] = 0x00000000;
329 * Initialize the Rx ring.
332 for (i = 0; i < RX_RING_SIZE; i++) {
333 lp->rx_ring[i].base = PCI_TO_MEM_LE (dev, lp->rx_buf[i]);
334 lp->rx_ring[i].buf_length = cpu_to_le16 (-PKT_BUF_SZ);
335 lp->rx_ring[i].status = cpu_to_le16 (0x8000);
337 ("Rx%d: base=0x%x buf_length=0x%hx status=0x%hx\n", i,
338 lp->rx_ring[i].base, lp->rx_ring[i].buf_length,
339 lp->rx_ring[i].status);
343 * Initialize the Tx ring. The Tx buffer address is filled in as
344 * needed, but we do need to clear the upper ownership bit.
347 for (i = 0; i < TX_RING_SIZE; i++) {
348 lp->tx_ring[i].base = 0;
349 lp->tx_ring[i].status = 0;
355 PCNET_DEBUG1 ("Init block at 0x%p: MAC", &lp->init_block);
357 for (i = 0; i < 6; i++) {
358 lp->init_block.phys_addr[i] = dev->enetaddr[i];
359 PCNET_DEBUG1 (" %02x", lp->init_block.phys_addr[i]);
362 lp->init_block.tlen_rlen = cpu_to_le16 (TX_RING_LEN_BITS |
364 lp->init_block.rx_ring = PCI_TO_MEM_LE (dev, lp->rx_ring);
365 lp->init_block.tx_ring = PCI_TO_MEM_LE (dev, lp->tx_ring);
367 PCNET_DEBUG1 ("\ntlen_rlen=0x%x rx_ring=0x%x tx_ring=0x%x\n",
368 lp->init_block.tlen_rlen,
369 lp->init_block.rx_ring, lp->init_block.tx_ring);
372 * Tell the controller where the Init Block is located.
374 addr = PCI_TO_MEM (dev, &lp->init_block);
375 pcnet_write_csr (dev, 1, addr & 0xffff);
376 pcnet_write_csr (dev, 2, (addr >> 16) & 0xffff);
378 pcnet_write_csr (dev, 4, 0x0915);
379 pcnet_write_csr (dev, 0, 0x0001); /* start */
381 /* Wait for Init Done bit */
382 for (i = 10000; i > 0; i--) {
383 if (pcnet_read_csr (dev, 0) & 0x0100)
388 printf ("%s: TIMEOUT: controller init failed\n", dev->name);
394 * Finally start network controller operation.
396 pcnet_write_csr (dev, 0, 0x0002);
401 static int pcnet_send(struct eth_device *dev, void *packet, int pkt_len)
404 struct pcnet_tx_head *entry = &lp->tx_ring[lp->cur_tx];
406 PCNET_DEBUG2 ("Tx%d: %d bytes from 0x%p ", lp->cur_tx, pkt_len,
409 /* Wait for completion by testing the OWN bit */
410 for (i = 1000; i > 0; i--) {
411 status = le16_to_cpu (entry->status);
412 if ((status & 0x8000) == 0)
418 printf ("%s: TIMEOUT: Tx%d failed (status = 0x%x)\n",
419 dev->name, lp->cur_tx, status);
425 * Setup Tx ring. Caution: the write order is important here,
426 * set the status with the "ownership" bits last.
429 entry->length = le16_to_cpu (-pkt_len);
430 entry->misc = 0x00000000;
431 entry->base = PCI_TO_MEM_LE (dev, packet);
432 entry->status = le16_to_cpu (status);
434 /* Trigger an immediate send poll. */
435 pcnet_write_csr (dev, 0, 0x0008);
438 if (++lp->cur_tx >= TX_RING_SIZE)
441 PCNET_DEBUG2 ("done\n");
445 static int pcnet_recv (struct eth_device *dev)
447 struct pcnet_rx_head *entry;
452 entry = &lp->rx_ring[lp->cur_rx];
454 * If we own the next entry, it's a new packet. Send it up.
456 if (((status = le16_to_cpu (entry->status)) & 0x8000) != 0) {
461 if (status != 0x03) { /* There was an error. */
463 printf ("%s: Rx%d", dev->name, lp->cur_rx);
464 PCNET_DEBUG1 (" (status=0x%x)", status);
468 printf (" Overflow");
474 entry->status &= le16_to_cpu (0x03ff);
479 (le32_to_cpu (entry->msg_length) & 0xfff) - 4;
481 printf ("%s: Rx%d: invalid packet length %d\n", dev->name, lp->cur_rx, pkt_len);
483 NetReceive (lp->rx_buf[lp->cur_rx], pkt_len);
484 PCNET_DEBUG2 ("Rx%d: %d bytes from 0x%p\n",
486 lp->rx_buf[lp->cur_rx]);
489 entry->status |= cpu_to_le16 (0x8000);
491 if (++lp->cur_rx >= RX_RING_SIZE)
497 static void pcnet_halt (struct eth_device *dev)
501 PCNET_DEBUG1 ("%s: pcnet_halt...\n", dev->name);
503 /* Reset the PCnet controller */
506 /* Wait for Stop bit */
507 for (i = 1000; i > 0; i--) {
508 if (pcnet_read_csr (dev, 0) & 0x4)
513 printf ("%s: TIMEOUT: controller reset failed\n", dev->name);