net: pcnet: Wrap devbusfn into private data
[platform/kernel/u-boot.git] / drivers / net / pcnet.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2002 Wolfgang Grandegger, wg@denx.de.
4  *
5  * This driver for AMD PCnet network controllers is derived from the
6  * Linux driver pcnet32.c written 1996-1999 by Thomas Bogendoerfer.
7  */
8
9 #include <common.h>
10 #include <cpu_func.h>
11 #include <log.h>
12 #include <malloc.h>
13 #include <memalign.h>
14 #include <net.h>
15 #include <netdev.h>
16 #include <asm/cache.h>
17 #include <asm/io.h>
18 #include <pci.h>
19 #include <linux/delay.h>
20
21 #define PCNET_DEBUG_LEVEL       0       /* 0=off, 1=init, 2=rx/tx */
22
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)
27
28 /*
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).
32  */
33 #define PCNET_LOG_TX_BUFFERS    0
34 #define PCNET_LOG_RX_BUFFERS    2
35
36 #define TX_RING_SIZE            (1 << (PCNET_LOG_TX_BUFFERS))
37 #define TX_RING_LEN_BITS        ((PCNET_LOG_TX_BUFFERS) << 12)
38
39 #define RX_RING_SIZE            (1 << (PCNET_LOG_RX_BUFFERS))
40 #define RX_RING_LEN_BITS        ((PCNET_LOG_RX_BUFFERS) << 4)
41
42 #define PKT_BUF_SZ              1544
43
44 /* The PCNET Rx and Tx ring descriptors. */
45 struct pcnet_rx_head {
46         u32 base;
47         s16 buf_length;
48         s16 status;
49         u32 msg_length;
50         u32 reserved;
51 };
52
53 struct pcnet_tx_head {
54         u32 base;
55         s16 length;
56         s16 status;
57         u32 misc;
58         u32 reserved;
59 };
60
61 /* The PCNET 32-Bit initialization block, described in databook. */
62 struct pcnet_init_block {
63         u16 mode;
64         u16 tlen_rlen;
65         u8 phys_addr[6];
66         u16 reserved;
67         u32 filter[2];
68         /* Receive and transmit ring base, along with extra bits. */
69         u32 rx_ring;
70         u32 tx_ring;
71         u32 reserved2;
72 };
73
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);
79
80 struct pcnet_priv {
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;
85         pci_dev_t dev;
86         int cur_rx;
87         int cur_tx;
88 };
89
90 static struct pcnet_priv *lp;
91
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
97
98 static u16 pcnet_read_csr(struct eth_device *dev, int index)
99 {
100         void __iomem *base = (void __iomem *)dev->iobase;
101
102         writew(index, base + PCNET_RAP);
103         return readw(base + PCNET_RDP);
104 }
105
106 static void pcnet_write_csr(struct eth_device *dev, int index, u16 val)
107 {
108         void __iomem *base = (void __iomem *)dev->iobase;
109
110         writew(index, base + PCNET_RAP);
111         writew(val, base + PCNET_RDP);
112 }
113
114 static u16 pcnet_read_bcr(struct eth_device *dev, int index)
115 {
116         void __iomem *base = (void __iomem *)dev->iobase;
117
118         writew(index, base + PCNET_RAP);
119         return readw(base + PCNET_BDP);
120 }
121
122 static void pcnet_write_bcr(struct eth_device *dev, int index, u16 val)
123 {
124         void __iomem *base = (void __iomem *)dev->iobase;
125
126         writew(index, base + PCNET_RAP);
127         writew(val, base + PCNET_BDP);
128 }
129
130 static void pcnet_reset(struct eth_device *dev)
131 {
132         void __iomem *base = (void __iomem *)dev->iobase;
133
134         readw(base + PCNET_RESET);
135 }
136
137 static int pcnet_check(struct eth_device *dev)
138 {
139         void __iomem *base = (void __iomem *)dev->iobase;
140
141         writew(88, base + PCNET_RAP);
142         return readw(base + PCNET_RAP) == 88;
143 }
144
145 static inline pci_addr_t pcnet_virt_to_mem(struct pcnet_priv *lp, void *addr)
146 {
147         void *virt_addr = addr;
148
149         return pci_virt_to_mem(lp->dev, virt_addr);
150 }
151
152 static struct pci_device_id supported[] = {
153         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LANCE) },
154         {}
155 };
156
157 static int pcnet_probe(struct eth_device *dev, bd_t *bis, int dev_nr)
158 {
159         int chip_version;
160         char *chipname;
161         int i;
162
163         /* Reset the PCnet controller */
164         pcnet_reset(dev);
165
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);
169                 return -1;
170         }
171
172         /* Identify the chip */
173         chip_version =
174                 pcnet_read_csr(dev, 88) | (pcnet_read_csr(dev, 89) << 16);
175         if ((chip_version & 0xfff) != 0x003)
176                 return -1;
177         chip_version = (chip_version >> 12) & 0xffff;
178         switch (chip_version) {
179         case 0x2621:
180                 chipname = "PCnet/PCI II 79C970A";      /* PCI */
181                 break;
182         case 0x2625:
183                 chipname = "PCnet/FAST III 79C973";     /* PCI */
184                 break;
185         case 0x2627:
186                 chipname = "PCnet/FAST III 79C975";     /* PCI */
187                 break;
188         default:
189                 printf("%s: PCnet version %#x not supported\n",
190                        dev->name, chip_version);
191                 return -1;
192         }
193
194         PCNET_DEBUG1("AMD %s\n", chipname);
195
196         /*
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.
200          */
201         for (i = 0; i < 3; i++) {
202                 unsigned int val;
203
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;
208         }
209
210         return 0;
211 }
212
213 static int pcnet_init(struct eth_device *dev, bd_t *bis)
214 {
215         struct pcnet_uncached_priv *uc;
216         int i, val;
217         unsigned long addr;
218
219         PCNET_DEBUG1("%s: pcnet_init...\n", dev->name);
220
221         /* Switch pcnet to 32bit mode */
222         pcnet_write_bcr(dev, 20, 2);
223
224         /* Set/reset autoselect bit */
225         val = pcnet_read_bcr(dev, 2) & ~2;
226         val |= 2;
227         pcnet_write_bcr(dev, 2, val);
228
229         /* Enable auto negotiate, setup, disable fd */
230         val = pcnet_read_bcr(dev, 32) & ~0x98;
231         val |= 0x20;
232         pcnet_write_bcr(dev, 32, val);
233
234         /*
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.
241          */
242         val = pcnet_read_bcr(dev, 18);
243         val |= 1 << 11;
244         pcnet_write_bcr(dev, 18, val);
245         val = pcnet_read_csr(dev, 80);
246         val |= 0x3 << 10;
247         pcnet_write_csr(dev, 80, val);
248
249         uc = lp->uc;
250
251         uc->init_block.mode = cpu_to_le16(0x0000);
252         uc->init_block.filter[0] = 0x00000000;
253         uc->init_block.filter[1] = 0x00000000;
254
255         /*
256          * Initialize the Rx ring.
257          */
258         lp->cur_rx = 0;
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);
264                 PCNET_DEBUG1
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);
268         }
269
270         /*
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.
273          */
274         lp->cur_tx = 0;
275         for (i = 0; i < TX_RING_SIZE; i++) {
276                 uc->tx_ring[i].base = 0;
277                 uc->tx_ring[i].status = 0;
278         }
279
280         /*
281          * Setup Init Block.
282          */
283         PCNET_DEBUG1("Init block at 0x%p: MAC", &lp->uc->init_block);
284
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]);
288         }
289
290         uc->init_block.tlen_rlen = cpu_to_le16(TX_RING_LEN_BITS |
291                                                RX_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);
296
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);
300
301         /*
302          * Tell the controller where the Init Block is located.
303          */
304         barrier();
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);
308
309         pcnet_write_csr(dev, 4, 0x0915);
310         pcnet_write_csr(dev, 0, 0x0001);        /* start */
311
312         /* Wait for Init Done bit */
313         for (i = 10000; i > 0; i--) {
314                 if (pcnet_read_csr(dev, 0) & 0x0100)
315                         break;
316                 udelay(10);
317         }
318         if (i <= 0) {
319                 printf("%s: TIMEOUT: controller init failed\n", dev->name);
320                 pcnet_reset(dev);
321                 return -1;
322         }
323
324         /*
325          * Finally start network controller operation.
326          */
327         pcnet_write_csr(dev, 0, 0x0002);
328
329         return 0;
330 }
331
332 static int pcnet_send(struct eth_device *dev, void *packet, int pkt_len)
333 {
334         int i, status;
335         u32 addr;
336         struct pcnet_tx_head *entry = &lp->uc->tx_ring[lp->cur_tx];
337
338         PCNET_DEBUG2("Tx%d: %d bytes from 0x%p ", lp->cur_tx, pkt_len,
339                      packet);
340
341         flush_dcache_range((unsigned long)packet,
342                            (unsigned long)packet + pkt_len);
343
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)
348                         break;
349                 udelay(100);
350                 PCNET_DEBUG2(".");
351         }
352         if (i <= 0) {
353                 printf("%s: TIMEOUT: Tx%d failed (status = 0x%x)\n",
354                        dev->name, lp->cur_tx, status);
355                 pkt_len = 0;
356                 goto failure;
357         }
358
359         /*
360          * Setup Tx ring. Caution: the write order is important here,
361          * set the status with the "ownership" bits last.
362          */
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);
368
369         /* Trigger an immediate send poll. */
370         pcnet_write_csr(dev, 0, 0x0008);
371
372       failure:
373         if (++lp->cur_tx >= TX_RING_SIZE)
374                 lp->cur_tx = 0;
375
376         PCNET_DEBUG2("done\n");
377         return pkt_len;
378 }
379
380 static int pcnet_recv (struct eth_device *dev)
381 {
382         struct pcnet_rx_head *entry;
383         unsigned char *buf;
384         int pkt_len = 0;
385         u16 status, err_status;
386
387         while (1) {
388                 entry = &lp->uc->rx_ring[lp->cur_rx];
389                 /*
390                  * If we own the next entry, it's a new packet. Send it up.
391                  */
392                 status = readw(&entry->status);
393                 if ((status & 0x8000) != 0)
394                         break;
395                 err_status = status >> 8;
396
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)
401                                 printf(" Frame");
402                         if (err_status & 0x10)
403                                 printf(" Overflow");
404                         if (err_status & 0x08)
405                                 printf(" CRC");
406                         if (err_status & 0x04)
407                                 printf(" Fifo");
408                         printf(" Error\n");
409                         status &= 0x03ff;
410
411                 } else {
412                         pkt_len = (readl(&entry->msg_length) & 0xfff) - 4;
413                         if (pkt_len < 60) {
414                                 printf("%s: Rx%d: invalid packet length %d\n",
415                                        dev->name, lp->cur_rx, pkt_len);
416                         } else {
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);
423                         }
424                 }
425
426                 status |= 0x8000;
427                 writew(status, &entry->status);
428
429                 if (++lp->cur_rx >= RX_RING_SIZE)
430                         lp->cur_rx = 0;
431         }
432         return pkt_len;
433 }
434
435 static void pcnet_halt(struct eth_device *dev)
436 {
437         int i;
438
439         PCNET_DEBUG1("%s: pcnet_halt...\n", dev->name);
440
441         /* Reset the PCnet controller */
442         pcnet_reset(dev);
443
444         /* Wait for Stop bit */
445         for (i = 1000; i > 0; i--) {
446                 if (pcnet_read_csr(dev, 0) & 0x4)
447                         break;
448                 udelay(10);
449         }
450         if (i <= 0)
451                 printf("%s: TIMEOUT: controller reset failed\n", dev->name);
452 }
453
454 int pcnet_initialize(bd_t *bis)
455 {
456         pci_dev_t devbusfn;
457         struct eth_device *dev;
458         u16 command, status;
459         int dev_nr = 0;
460         u32 bar;
461
462         PCNET_DEBUG1("\npcnet_initialize...\n");
463
464         for (dev_nr = 0; ; dev_nr++) {
465                 /*
466                  * Find the PCnet PCI device(s).
467                  */
468                 devbusfn = pci_find_devices(supported, dev_nr);
469                 if (devbusfn < 0)
470                         break;
471
472                 /*
473                  * Allocate and pre-fill the device structure.
474                  */
475                 dev = calloc(1, sizeof(*dev));
476                 if (!dev) {
477                         printf("pcnet: Can not allocate memory\n");
478                         break;
479                 }
480
481                 /*
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.
485                  */
486                 if (!lp) {
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));
492                 }
493
494                 lp->dev = devbusfn;
495                 sprintf(dev->name, "pcnet#%d", dev_nr);
496
497                 /*
498                  * Setup the PCI device.
499                  */
500                 pci_read_config_dword(devbusfn, PCI_BASE_ADDRESS_1, &bar);
501                 dev->iobase = pci_mem_to_phys(devbusfn, bar);
502                 dev->iobase &= ~0xf;
503
504                 PCNET_DEBUG1("%s: devbusfn=0x%x iobase=0x%lx: ",
505                              dev->name, devbusfn, (unsigned long)dev->iobase);
506
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",
512                                dev->name);
513                         free(dev);
514                         continue;
515                 }
516
517                 pci_write_config_byte(devbusfn, PCI_LATENCY_TIMER, 0x40);
518
519                 /*
520                  * Probe the PCnet chip.
521                  */
522                 if (pcnet_probe(dev, bis, dev_nr) < 0) {
523                         free(dev);
524                         continue;
525                 }
526
527                 /*
528                  * Setup device structure and register the driver.
529                  */
530                 dev->init = pcnet_init;
531                 dev->halt = pcnet_halt;
532                 dev->send = pcnet_send;
533                 dev->recv = pcnet_recv;
534
535                 eth_register(dev);
536         }
537
538         udelay(10 * 1000);
539
540         return dev_nr;
541 }