common: Drop linux/delay.h from common header
[oweals/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 <net.h>
14 #include <netdev.h>
15 #include <asm/cache.h>
16 #include <asm/io.h>
17 #include <pci.h>
18 #include <linux/delay.h>
19
20 #define PCNET_DEBUG_LEVEL       0       /* 0=off, 1=init, 2=rx/tx */
21
22 #define PCNET_DEBUG1(fmt,args...)       \
23         debug_cond(PCNET_DEBUG_LEVEL > 0, fmt ,##args)
24 #define PCNET_DEBUG2(fmt,args...)       \
25         debug_cond(PCNET_DEBUG_LEVEL > 1, fmt ,##args)
26
27 /*
28  * Set the number of Tx and Rx buffers, using Log_2(# buffers).
29  * Reasonable default values are 4 Tx buffers, and 16 Rx buffers.
30  * That translates to 2 (4 == 2^^2) and 4 (16 == 2^^4).
31  */
32 #define PCNET_LOG_TX_BUFFERS    0
33 #define PCNET_LOG_RX_BUFFERS    2
34
35 #define TX_RING_SIZE            (1 << (PCNET_LOG_TX_BUFFERS))
36 #define TX_RING_LEN_BITS        ((PCNET_LOG_TX_BUFFERS) << 12)
37
38 #define RX_RING_SIZE            (1 << (PCNET_LOG_RX_BUFFERS))
39 #define RX_RING_LEN_BITS        ((PCNET_LOG_RX_BUFFERS) << 4)
40
41 #define PKT_BUF_SZ              1544
42
43 /* The PCNET Rx and Tx ring descriptors. */
44 struct pcnet_rx_head {
45         u32 base;
46         s16 buf_length;
47         s16 status;
48         u32 msg_length;
49         u32 reserved;
50 };
51
52 struct pcnet_tx_head {
53         u32 base;
54         s16 length;
55         s16 status;
56         u32 misc;
57         u32 reserved;
58 };
59
60 /* The PCNET 32-Bit initialization block, described in databook. */
61 struct pcnet_init_block {
62         u16 mode;
63         u16 tlen_rlen;
64         u8 phys_addr[6];
65         u16 reserved;
66         u32 filter[2];
67         /* Receive and transmit ring base, along with extra bits. */
68         u32 rx_ring;
69         u32 tx_ring;
70         u32 reserved2;
71 };
72
73 struct pcnet_uncached_priv {
74         struct pcnet_rx_head rx_ring[RX_RING_SIZE];
75         struct pcnet_tx_head tx_ring[TX_RING_SIZE];
76         struct pcnet_init_block init_block;
77 };
78
79 typedef struct pcnet_priv {
80         struct pcnet_uncached_priv *uc;
81         /* Receive Buffer space */
82         unsigned char (*rx_buf)[RX_RING_SIZE][PKT_BUF_SZ + 4];
83         int cur_rx;
84         int cur_tx;
85 } pcnet_priv_t;
86
87 static pcnet_priv_t *lp;
88
89 /* Offsets from base I/O address for WIO mode */
90 #define PCNET_RDP               0x10
91 #define PCNET_RAP               0x12
92 #define PCNET_RESET             0x14
93 #define PCNET_BDP               0x16
94
95 static u16 pcnet_read_csr(struct eth_device *dev, int index)
96 {
97         void __iomem *base = (void __iomem *)dev->iobase;
98
99         writew(index, base + PCNET_RAP);
100         return readw(base + PCNET_RDP);
101 }
102
103 static void pcnet_write_csr(struct eth_device *dev, int index, u16 val)
104 {
105         void __iomem *base = (void __iomem *)dev->iobase;
106
107         writew(index, base + PCNET_RAP);
108         writew(val, base + PCNET_RDP);
109 }
110
111 static u16 pcnet_read_bcr(struct eth_device *dev, int index)
112 {
113         void __iomem *base = (void __iomem *)dev->iobase;
114
115         writew(index, base + PCNET_RAP);
116         return readw(base + PCNET_BDP);
117 }
118
119 static void pcnet_write_bcr(struct eth_device *dev, int index, u16 val)
120 {
121         void __iomem *base = (void __iomem *)dev->iobase;
122
123         writew(index, base + PCNET_RAP);
124         writew(val, base + PCNET_BDP);
125 }
126
127 static void pcnet_reset(struct eth_device *dev)
128 {
129         void __iomem *base = (void __iomem *)dev->iobase;
130
131         readw(base + PCNET_RESET);
132 }
133
134 static int pcnet_check(struct eth_device *dev)
135 {
136         void __iomem *base = (void __iomem *)dev->iobase;
137
138         writew(88, base + PCNET_RAP);
139         return readw(base + PCNET_RAP) == 88;
140 }
141
142 static int pcnet_init (struct eth_device *dev, bd_t * bis);
143 static int pcnet_send(struct eth_device *dev, void *packet, int length);
144 static int pcnet_recv (struct eth_device *dev);
145 static void pcnet_halt (struct eth_device *dev);
146 static int pcnet_probe (struct eth_device *dev, bd_t * bis, int dev_num);
147
148 static inline pci_addr_t pcnet_virt_to_mem(const struct eth_device *dev,
149                                                 void *addr)
150 {
151         pci_dev_t devbusfn = (pci_dev_t)(unsigned long)dev->priv;
152         void *virt_addr = addr;
153
154         return pci_virt_to_mem(devbusfn, virt_addr);
155 }
156
157 static struct pci_device_id supported[] = {
158         {PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LANCE},
159         {}
160 };
161
162
163 int pcnet_initialize(bd_t *bis)
164 {
165         pci_dev_t devbusfn;
166         struct eth_device *dev;
167         u16 command, status;
168         int dev_nr = 0;
169         u32 bar;
170
171         PCNET_DEBUG1("\npcnet_initialize...\n");
172
173         for (dev_nr = 0;; dev_nr++) {
174
175                 /*
176                  * Find the PCnet PCI device(s).
177                  */
178                 devbusfn = pci_find_devices(supported, dev_nr);
179                 if (devbusfn < 0)
180                         break;
181
182                 /*
183                  * Allocate and pre-fill the device structure.
184                  */
185                 dev = (struct eth_device *)malloc(sizeof(*dev));
186                 if (!dev) {
187                         printf("pcnet: Can not allocate memory\n");
188                         break;
189                 }
190                 memset(dev, 0, sizeof(*dev));
191                 dev->priv = (void *)(unsigned long)devbusfn;
192                 sprintf(dev->name, "pcnet#%d", dev_nr);
193
194                 /*
195                  * Setup the PCI device.
196                  */
197                 pci_read_config_dword(devbusfn, PCI_BASE_ADDRESS_1, &bar);
198                 dev->iobase = pci_mem_to_phys(devbusfn, bar);
199                 dev->iobase &= ~0xf;
200
201                 PCNET_DEBUG1("%s: devbusfn=0x%x iobase=0x%lx: ",
202                              dev->name, devbusfn, (unsigned long)dev->iobase);
203
204                 command = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
205                 pci_write_config_word(devbusfn, PCI_COMMAND, command);
206                 pci_read_config_word(devbusfn, PCI_COMMAND, &status);
207                 if ((status & command) != command) {
208                         printf("%s: Couldn't enable IO access or Bus Mastering\n",
209                                dev->name);
210                         free(dev);
211                         continue;
212                 }
213
214                 pci_write_config_byte(devbusfn, PCI_LATENCY_TIMER, 0x40);
215
216                 /*
217                  * Probe the PCnet chip.
218                  */
219                 if (pcnet_probe(dev, bis, dev_nr) < 0) {
220                         free(dev);
221                         continue;
222                 }
223
224                 /*
225                  * Setup device structure and register the driver.
226                  */
227                 dev->init = pcnet_init;
228                 dev->halt = pcnet_halt;
229                 dev->send = pcnet_send;
230                 dev->recv = pcnet_recv;
231
232                 eth_register(dev);
233         }
234
235         udelay(10 * 1000);
236
237         return dev_nr;
238 }
239
240 static int pcnet_probe(struct eth_device *dev, bd_t *bis, int dev_nr)
241 {
242         int chip_version;
243         char *chipname;
244
245 #ifdef PCNET_HAS_PROM
246         int i;
247 #endif
248
249         /* Reset the PCnet controller */
250         pcnet_reset(dev);
251
252         /* Check if register access is working */
253         if (pcnet_read_csr(dev, 0) != 4 || !pcnet_check(dev)) {
254                 printf("%s: CSR register access check failed\n", dev->name);
255                 return -1;
256         }
257
258         /* Identify the chip */
259         chip_version =
260                 pcnet_read_csr(dev, 88) | (pcnet_read_csr(dev, 89) << 16);
261         if ((chip_version & 0xfff) != 0x003)
262                 return -1;
263         chip_version = (chip_version >> 12) & 0xffff;
264         switch (chip_version) {
265         case 0x2621:
266                 chipname = "PCnet/PCI II 79C970A";      /* PCI */
267                 break;
268         case 0x2625:
269                 chipname = "PCnet/FAST III 79C973";     /* PCI */
270                 break;
271         case 0x2627:
272                 chipname = "PCnet/FAST III 79C975";     /* PCI */
273                 break;
274         default:
275                 printf("%s: PCnet version %#x not supported\n",
276                        dev->name, chip_version);
277                 return -1;
278         }
279
280         PCNET_DEBUG1("AMD %s\n", chipname);
281
282 #ifdef PCNET_HAS_PROM
283         /*
284          * In most chips, after a chip reset, the ethernet address is read from
285          * the station address PROM at the base address and programmed into the
286          * "Physical Address Registers" CSR12-14.
287          */
288         for (i = 0; i < 3; i++) {
289                 unsigned int val;
290
291                 val = pcnet_read_csr(dev, i + 12) & 0x0ffff;
292                 /* There may be endianness issues here. */
293                 dev->enetaddr[2 * i] = val & 0x0ff;
294                 dev->enetaddr[2 * i + 1] = (val >> 8) & 0x0ff;
295         }
296 #endif /* PCNET_HAS_PROM */
297
298         return 0;
299 }
300
301 static int pcnet_init(struct eth_device *dev, bd_t *bis)
302 {
303         struct pcnet_uncached_priv *uc;
304         int i, val;
305         unsigned long addr;
306
307         PCNET_DEBUG1("%s: pcnet_init...\n", dev->name);
308
309         /* Switch pcnet to 32bit mode */
310         pcnet_write_bcr(dev, 20, 2);
311
312         /* Set/reset autoselect bit */
313         val = pcnet_read_bcr(dev, 2) & ~2;
314         val |= 2;
315         pcnet_write_bcr(dev, 2, val);
316
317         /* Enable auto negotiate, setup, disable fd */
318         val = pcnet_read_bcr(dev, 32) & ~0x98;
319         val |= 0x20;
320         pcnet_write_bcr(dev, 32, val);
321
322         /*
323          * Enable NOUFLO on supported controllers, with the transmit
324          * start point set to the full packet. This will cause entire
325          * packets to be buffered by the ethernet controller before
326          * transmission, eliminating underflows which are common on
327          * slower devices. Controllers which do not support NOUFLO will
328          * simply be left with a larger transmit FIFO threshold.
329          */
330         val = pcnet_read_bcr(dev, 18);
331         val |= 1 << 11;
332         pcnet_write_bcr(dev, 18, val);
333         val = pcnet_read_csr(dev, 80);
334         val |= 0x3 << 10;
335         pcnet_write_csr(dev, 80, val);
336
337         /*
338          * We only maintain one structure because the drivers will never
339          * be used concurrently. In 32bit mode the RX and TX ring entries
340          * must be aligned on 16-byte boundaries.
341          */
342         if (lp == NULL) {
343                 addr = (unsigned long)malloc(sizeof(pcnet_priv_t) + 0x10);
344                 addr = (addr + 0xf) & ~0xf;
345                 lp = (pcnet_priv_t *)addr;
346
347                 addr = (unsigned long)memalign(ARCH_DMA_MINALIGN,
348                                                sizeof(*lp->uc));
349                 flush_dcache_range(addr, addr + sizeof(*lp->uc));
350                 addr = (unsigned long)map_physmem(addr,
351                                 roundup(sizeof(*lp->uc), ARCH_DMA_MINALIGN),
352                                 MAP_NOCACHE);
353                 lp->uc = (struct pcnet_uncached_priv *)addr;
354
355                 addr = (unsigned long)memalign(ARCH_DMA_MINALIGN,
356                                                sizeof(*lp->rx_buf));
357                 flush_dcache_range(addr, addr + sizeof(*lp->rx_buf));
358                 lp->rx_buf = (void *)addr;
359         }
360
361         uc = lp->uc;
362
363         uc->init_block.mode = cpu_to_le16(0x0000);
364         uc->init_block.filter[0] = 0x00000000;
365         uc->init_block.filter[1] = 0x00000000;
366
367         /*
368          * Initialize the Rx ring.
369          */
370         lp->cur_rx = 0;
371         for (i = 0; i < RX_RING_SIZE; i++) {
372                 addr = pcnet_virt_to_mem(dev, (*lp->rx_buf)[i]);
373                 uc->rx_ring[i].base = cpu_to_le32(addr);
374                 uc->rx_ring[i].buf_length = cpu_to_le16(-PKT_BUF_SZ);
375                 uc->rx_ring[i].status = cpu_to_le16(0x8000);
376                 PCNET_DEBUG1
377                         ("Rx%d: base=0x%x buf_length=0x%hx status=0x%hx\n", i,
378                          uc->rx_ring[i].base, uc->rx_ring[i].buf_length,
379                          uc->rx_ring[i].status);
380         }
381
382         /*
383          * Initialize the Tx ring. The Tx buffer address is filled in as
384          * needed, but we do need to clear the upper ownership bit.
385          */
386         lp->cur_tx = 0;
387         for (i = 0; i < TX_RING_SIZE; i++) {
388                 uc->tx_ring[i].base = 0;
389                 uc->tx_ring[i].status = 0;
390         }
391
392         /*
393          * Setup Init Block.
394          */
395         PCNET_DEBUG1("Init block at 0x%p: MAC", &lp->uc->init_block);
396
397         for (i = 0; i < 6; i++) {
398                 lp->uc->init_block.phys_addr[i] = dev->enetaddr[i];
399                 PCNET_DEBUG1(" %02x", lp->uc->init_block.phys_addr[i]);
400         }
401
402         uc->init_block.tlen_rlen = cpu_to_le16(TX_RING_LEN_BITS |
403                                                RX_RING_LEN_BITS);
404         addr = pcnet_virt_to_mem(dev, uc->rx_ring);
405         uc->init_block.rx_ring = cpu_to_le32(addr);
406         addr = pcnet_virt_to_mem(dev, uc->tx_ring);
407         uc->init_block.tx_ring = cpu_to_le32(addr);
408
409         PCNET_DEBUG1("\ntlen_rlen=0x%x rx_ring=0x%x tx_ring=0x%x\n",
410                      uc->init_block.tlen_rlen,
411                      uc->init_block.rx_ring, uc->init_block.tx_ring);
412
413         /*
414          * Tell the controller where the Init Block is located.
415          */
416         barrier();
417         addr = pcnet_virt_to_mem(dev, &lp->uc->init_block);
418         pcnet_write_csr(dev, 1, addr & 0xffff);
419         pcnet_write_csr(dev, 2, (addr >> 16) & 0xffff);
420
421         pcnet_write_csr(dev, 4, 0x0915);
422         pcnet_write_csr(dev, 0, 0x0001);        /* start */
423
424         /* Wait for Init Done bit */
425         for (i = 10000; i > 0; i--) {
426                 if (pcnet_read_csr(dev, 0) & 0x0100)
427                         break;
428                 udelay(10);
429         }
430         if (i <= 0) {
431                 printf("%s: TIMEOUT: controller init failed\n", dev->name);
432                 pcnet_reset(dev);
433                 return -1;
434         }
435
436         /*
437          * Finally start network controller operation.
438          */
439         pcnet_write_csr(dev, 0, 0x0002);
440
441         return 0;
442 }
443
444 static int pcnet_send(struct eth_device *dev, void *packet, int pkt_len)
445 {
446         int i, status;
447         u32 addr;
448         struct pcnet_tx_head *entry = &lp->uc->tx_ring[lp->cur_tx];
449
450         PCNET_DEBUG2("Tx%d: %d bytes from 0x%p ", lp->cur_tx, pkt_len,
451                      packet);
452
453         flush_dcache_range((unsigned long)packet,
454                            (unsigned long)packet + pkt_len);
455
456         /* Wait for completion by testing the OWN bit */
457         for (i = 1000; i > 0; i--) {
458                 status = readw(&entry->status);
459                 if ((status & 0x8000) == 0)
460                         break;
461                 udelay(100);
462                 PCNET_DEBUG2(".");
463         }
464         if (i <= 0) {
465                 printf("%s: TIMEOUT: Tx%d failed (status = 0x%x)\n",
466                        dev->name, lp->cur_tx, status);
467                 pkt_len = 0;
468                 goto failure;
469         }
470
471         /*
472          * Setup Tx ring. Caution: the write order is important here,
473          * set the status with the "ownership" bits last.
474          */
475         addr = pcnet_virt_to_mem(dev, packet);
476         writew(-pkt_len, &entry->length);
477         writel(0, &entry->misc);
478         writel(addr, &entry->base);
479         writew(0x8300, &entry->status);
480
481         /* Trigger an immediate send poll. */
482         pcnet_write_csr(dev, 0, 0x0008);
483
484       failure:
485         if (++lp->cur_tx >= TX_RING_SIZE)
486                 lp->cur_tx = 0;
487
488         PCNET_DEBUG2("done\n");
489         return pkt_len;
490 }
491
492 static int pcnet_recv (struct eth_device *dev)
493 {
494         struct pcnet_rx_head *entry;
495         unsigned char *buf;
496         int pkt_len = 0;
497         u16 status, err_status;
498
499         while (1) {
500                 entry = &lp->uc->rx_ring[lp->cur_rx];
501                 /*
502                  * If we own the next entry, it's a new packet. Send it up.
503                  */
504                 status = readw(&entry->status);
505                 if ((status & 0x8000) != 0)
506                         break;
507                 err_status = status >> 8;
508
509                 if (err_status != 0x03) {       /* There was an error. */
510                         printf("%s: Rx%d", dev->name, lp->cur_rx);
511                         PCNET_DEBUG1(" (status=0x%x)", err_status);
512                         if (err_status & 0x20)
513                                 printf(" Frame");
514                         if (err_status & 0x10)
515                                 printf(" Overflow");
516                         if (err_status & 0x08)
517                                 printf(" CRC");
518                         if (err_status & 0x04)
519                                 printf(" Fifo");
520                         printf(" Error\n");
521                         status &= 0x03ff;
522
523                 } else {
524                         pkt_len = (readl(&entry->msg_length) & 0xfff) - 4;
525                         if (pkt_len < 60) {
526                                 printf("%s: Rx%d: invalid packet length %d\n",
527                                        dev->name, lp->cur_rx, pkt_len);
528                         } else {
529                                 buf = (*lp->rx_buf)[lp->cur_rx];
530                                 invalidate_dcache_range((unsigned long)buf,
531                                         (unsigned long)buf + pkt_len);
532                                 net_process_received_packet(buf, pkt_len);
533                                 PCNET_DEBUG2("Rx%d: %d bytes from 0x%p\n",
534                                              lp->cur_rx, pkt_len, buf);
535                         }
536                 }
537
538                 status |= 0x8000;
539                 writew(status, &entry->status);
540
541                 if (++lp->cur_rx >= RX_RING_SIZE)
542                         lp->cur_rx = 0;
543         }
544         return pkt_len;
545 }
546
547 static void pcnet_halt(struct eth_device *dev)
548 {
549         int i;
550
551         PCNET_DEBUG1("%s: pcnet_halt...\n", dev->name);
552
553         /* Reset the PCnet controller */
554         pcnet_reset(dev);
555
556         /* Wait for Stop bit */
557         for (i = 1000; i > 0; i--) {
558                 if (pcnet_read_csr(dev, 0) & 0x4)
559                         break;
560                 udelay(10);
561         }
562         if (i <= 0)
563                 printf("%s: TIMEOUT: controller reset failed\n", dev->name);
564 }