Merge master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6] / drivers / net / saa9730.c
1 /*
2  * Carsten Langgaard, carstenl@mips.com
3  * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
4  *
5  * ########################################################################
6  *
7  *  This program is free software; you can distribute it and/or modify it
8  *  under the terms of the GNU General Public License (Version 2) as
9  *  published by the Free Software Foundation.
10  *
11  *  This program is distributed in the hope it will be useful, but WITHOUT
12  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  *  for more details.
15  *
16  *  You should have received a copy of the GNU General Public License along
17  *  with this program; if not, write to the Free Software Foundation, Inc.,
18  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
19  *
20  * ########################################################################
21  *
22  * SAA9730 ethernet driver.
23  *
24  * Changes:
25  * Angelo Dell'Aera <buffer@antifork.org> : Conversion to the new PCI API (pci_driver).
26  *                                          Conversion to spinlocks.
27  *                                          Error handling fixes.
28  *                                           
29  */
30
31 #include <linux/init.h>
32 #include <linux/netdevice.h>
33 #include <linux/delay.h>
34 #include <linux/etherdevice.h>
35 #include <linux/module.h>
36 #include <linux/skbuff.h>
37 #include <linux/pci.h>
38 #include <linux/spinlock.h>
39
40 #include <asm/addrspace.h>
41 #include <asm/mips-boards/prom.h>
42
43 #include "saa9730.h"
44
45 #ifdef LAN_SAA9730_DEBUG
46 int lan_saa9730_debug = LAN_SAA9730_DEBUG;
47 #else
48 int lan_saa9730_debug;
49 #endif
50
51 #define DRV_MODULE_NAME "saa9730"
52
53 static struct pci_device_id saa9730_pci_tbl[] = {
54         { PCI_VENDOR_ID_PHILIPS, PCI_DEVICE_ID_PHILIPS_SAA9370,
55           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
56         { 0, }
57 };
58
59 MODULE_DEVICE_TABLE(pci, saa9730_pci_tbl);
60
61 /* Non-zero only if the current card is a PCI with BIOS-set IRQ. */
62 static unsigned int pci_irq_line;
63
64 #define INL(a)     inl((unsigned long)a)
65 #define OUTL(x,a)  outl(x,(unsigned long)a)
66
67 static void evm_saa9730_enable_lan_int(struct lan_saa9730_private *lp)
68 {
69         OUTL(INL(&lp->evm_saa9730_regs->InterruptBlock1) | EVM_LAN_INT,
70              &lp->evm_saa9730_regs->InterruptBlock1);
71         OUTL(INL(&lp->evm_saa9730_regs->InterruptStatus1) | EVM_LAN_INT,
72              &lp->evm_saa9730_regs->InterruptStatus1);
73         OUTL(INL(&lp->evm_saa9730_regs->InterruptEnable1) | EVM_LAN_INT |
74              EVM_MASTER_EN, &lp->evm_saa9730_regs->InterruptEnable1);
75 }
76 static void evm_saa9730_disable_lan_int(struct lan_saa9730_private *lp)
77 {
78         OUTL(INL(&lp->evm_saa9730_regs->InterruptBlock1) & ~EVM_LAN_INT,
79              &lp->evm_saa9730_regs->InterruptBlock1);
80         OUTL(INL(&lp->evm_saa9730_regs->InterruptEnable1) & ~EVM_LAN_INT,
81              &lp->evm_saa9730_regs->InterruptEnable1);
82 }
83
84 static void evm_saa9730_clear_lan_int(struct lan_saa9730_private *lp)
85 {
86         OUTL(EVM_LAN_INT, &lp->evm_saa9730_regs->InterruptStatus1);
87 }
88
89 static void evm_saa9730_block_lan_int(struct lan_saa9730_private *lp)
90 {
91         OUTL(INL(&lp->evm_saa9730_regs->InterruptBlock1) & ~EVM_LAN_INT,
92              &lp->evm_saa9730_regs->InterruptBlock1);
93 }
94
95 static void evm_saa9730_unblock_lan_int(struct lan_saa9730_private *lp)
96 {
97         OUTL(INL(&lp->evm_saa9730_regs->InterruptBlock1) | EVM_LAN_INT,
98              &lp->evm_saa9730_regs->InterruptBlock1);
99 }
100
101 static void show_saa9730_regs(struct lan_saa9730_private *lp)
102 {
103         int i, j;
104         printk("TxmBufferA = %x\n", lp->TxmBuffer[0][0]);
105         printk("TxmBufferB = %x\n", lp->TxmBuffer[1][0]);
106         printk("RcvBufferA = %x\n", lp->RcvBuffer[0][0]);
107         printk("RcvBufferB = %x\n", lp->RcvBuffer[1][0]);
108         for (i = 0; i < LAN_SAA9730_BUFFERS; i++) {
109                 for (j = 0; j < LAN_SAA9730_TXM_Q_SIZE; j++) {
110                         printk("TxmBuffer[%d][%d] = %x\n", i, j,
111                                le32_to_cpu(*(unsigned int *)
112                                            lp->TxmBuffer[i][j]));
113                 }
114         }
115         for (i = 0; i < LAN_SAA9730_BUFFERS; i++) {
116                 for (j = 0; j < LAN_SAA9730_RCV_Q_SIZE; j++) {
117                         printk("RcvBuffer[%d][%d] = %x\n", i, j,
118                                le32_to_cpu(*(unsigned int *)
119                                            lp->RcvBuffer[i][j]));
120                 }
121         }
122         printk("lp->evm_saa9730_regs->InterruptBlock1 = %x\n",
123                INL(&lp->evm_saa9730_regs->InterruptBlock1));
124         printk("lp->evm_saa9730_regs->InterruptStatus1 = %x\n",
125                INL(&lp->evm_saa9730_regs->InterruptStatus1));
126         printk("lp->evm_saa9730_regs->InterruptEnable1 = %x\n",
127                INL(&lp->evm_saa9730_regs->InterruptEnable1));
128         printk("lp->lan_saa9730_regs->Ok2Use = %x\n",
129                INL(&lp->lan_saa9730_regs->Ok2Use));
130         printk("lp->NextTxmBufferIndex = %x\n", lp->NextTxmBufferIndex);
131         printk("lp->NextTxmPacketIndex = %x\n", lp->NextTxmPacketIndex);
132         printk("lp->PendingTxmBufferIndex = %x\n",
133                lp->PendingTxmBufferIndex);
134         printk("lp->PendingTxmPacketIndex = %x\n",
135                lp->PendingTxmPacketIndex);
136         printk("lp->lan_saa9730_regs->LanDmaCtl = %x\n",
137                INL(&lp->lan_saa9730_regs->LanDmaCtl));
138         printk("lp->lan_saa9730_regs->DmaStatus = %x\n",
139                INL(&lp->lan_saa9730_regs->DmaStatus));
140         printk("lp->lan_saa9730_regs->CamCtl = %x\n",
141                INL(&lp->lan_saa9730_regs->CamCtl));
142         printk("lp->lan_saa9730_regs->TxCtl = %x\n",
143                INL(&lp->lan_saa9730_regs->TxCtl));
144         printk("lp->lan_saa9730_regs->TxStatus = %x\n",
145                INL(&lp->lan_saa9730_regs->TxStatus));
146         printk("lp->lan_saa9730_regs->RxCtl = %x\n",
147                INL(&lp->lan_saa9730_regs->RxCtl));
148         printk("lp->lan_saa9730_regs->RxStatus = %x\n",
149                INL(&lp->lan_saa9730_regs->RxStatus));
150         for (i = 0; i < LAN_SAA9730_CAM_DWORDS; i++) {
151                 OUTL(i, &lp->lan_saa9730_regs->CamAddress);
152                 printk("lp->lan_saa9730_regs->CamData = %x\n",
153                        INL(&lp->lan_saa9730_regs->CamData));
154         }
155         printk("lp->stats.tx_packets = %lx\n", lp->stats.tx_packets);
156         printk("lp->stats.tx_errors = %lx\n", lp->stats.tx_errors);
157         printk("lp->stats.tx_aborted_errors = %lx\n",
158                lp->stats.tx_aborted_errors);
159         printk("lp->stats.tx_window_errors = %lx\n",
160                lp->stats.tx_window_errors);
161         printk("lp->stats.tx_carrier_errors = %lx\n",
162                lp->stats.tx_carrier_errors);
163         printk("lp->stats.tx_fifo_errors = %lx\n",
164                lp->stats.tx_fifo_errors);
165         printk("lp->stats.tx_heartbeat_errors = %lx\n",
166                lp->stats.tx_heartbeat_errors);
167         printk("lp->stats.collisions = %lx\n", lp->stats.collisions);
168
169         printk("lp->stats.rx_packets = %lx\n", lp->stats.rx_packets);
170         printk("lp->stats.rx_errors = %lx\n", lp->stats.rx_errors);
171         printk("lp->stats.rx_dropped = %lx\n", lp->stats.rx_dropped);
172         printk("lp->stats.rx_crc_errors = %lx\n", lp->stats.rx_crc_errors);
173         printk("lp->stats.rx_frame_errors = %lx\n",
174                lp->stats.rx_frame_errors);
175         printk("lp->stats.rx_fifo_errors = %lx\n",
176                lp->stats.rx_fifo_errors);
177         printk("lp->stats.rx_length_errors = %lx\n",
178                lp->stats.rx_length_errors);
179
180         printk("lp->lan_saa9730_regs->DebugPCIMasterAddr = %x\n",
181                INL(&lp->lan_saa9730_regs->DebugPCIMasterAddr));
182         printk("lp->lan_saa9730_regs->DebugLanTxStateMachine = %x\n",
183                INL(&lp->lan_saa9730_regs->DebugLanTxStateMachine));
184         printk("lp->lan_saa9730_regs->DebugLanRxStateMachine = %x\n",
185                INL(&lp->lan_saa9730_regs->DebugLanRxStateMachine));
186         printk("lp->lan_saa9730_regs->DebugLanTxFifoPointers = %x\n",
187                INL(&lp->lan_saa9730_regs->DebugLanTxFifoPointers));
188         printk("lp->lan_saa9730_regs->DebugLanRxFifoPointers = %x\n",
189                INL(&lp->lan_saa9730_regs->DebugLanRxFifoPointers));
190         printk("lp->lan_saa9730_regs->DebugLanCtlStateMachine = %x\n",
191                INL(&lp->lan_saa9730_regs->DebugLanCtlStateMachine));
192 }
193
194 static void lan_saa9730_buffer_init(struct lan_saa9730_private *lp)
195 {
196         int i, j;
197
198         /* Init RX buffers */
199         for (i = 0; i < LAN_SAA9730_BUFFERS; i++) {
200                 for (j = 0; j < LAN_SAA9730_RCV_Q_SIZE; j++) {
201                         *(unsigned int *) lp->RcvBuffer[i][j] =
202                             cpu_to_le32(RXSF_READY <<
203                                         RX_STAT_CTL_OWNER_SHF);
204                 }
205         }
206
207         /* Init TX buffers */
208         for (i = 0; i < LAN_SAA9730_BUFFERS; i++) {
209                 for (j = 0; j < LAN_SAA9730_TXM_Q_SIZE; j++) {
210                         *(unsigned int *) lp->TxmBuffer[i][j] =
211                             cpu_to_le32(TXSF_EMPTY <<
212                                         TX_STAT_CTL_OWNER_SHF);
213                 }
214         }
215 }
216
217 static int lan_saa9730_allocate_buffers(struct lan_saa9730_private *lp)
218 {
219         unsigned int mem_size;
220         void *Pa;
221         unsigned int i, j, RcvBufferSize, TxmBufferSize;
222         unsigned int buffer_start;
223
224         /* 
225          * Allocate all RX and TX packets in one chunk. 
226          * The Rx and Tx packets must be PACKET_SIZE aligned.
227          */
228         mem_size = ((LAN_SAA9730_RCV_Q_SIZE + LAN_SAA9730_TXM_Q_SIZE) *
229                     LAN_SAA9730_PACKET_SIZE * LAN_SAA9730_BUFFERS) +
230             LAN_SAA9730_PACKET_SIZE;
231         buffer_start =
232             (unsigned int) kmalloc(mem_size, GFP_DMA | GFP_KERNEL);
233
234         if (!buffer_start)
235                 return -ENOMEM;
236
237         /* 
238          * Set DMA buffer to kseg1 (uncached).
239          * Make sure to flush before using it uncached.
240          */
241         Pa = (void *) KSEG1ADDR((buffer_start + LAN_SAA9730_PACKET_SIZE) &
242                                 ~(LAN_SAA9730_PACKET_SIZE - 1));
243         dma_cache_wback_inv((unsigned long) Pa, mem_size);
244
245         /* Initialize buffer space */
246         RcvBufferSize = LAN_SAA9730_PACKET_SIZE;
247         TxmBufferSize = LAN_SAA9730_PACKET_SIZE;
248         lp->DmaRcvPackets = LAN_SAA9730_RCV_Q_SIZE;
249         lp->DmaTxmPackets = LAN_SAA9730_TXM_Q_SIZE;
250
251         /* Init RX buffers */
252         for (i = 0; i < LAN_SAA9730_BUFFERS; i++) {
253                 for (j = 0; j < LAN_SAA9730_RCV_Q_SIZE; j++) {
254                         *(unsigned int *) Pa =
255                             cpu_to_le32(RXSF_READY <<
256                                         RX_STAT_CTL_OWNER_SHF);
257                         lp->RcvBuffer[i][j] = (unsigned int) Pa;
258                         Pa += RcvBufferSize;
259                 }
260         }
261
262         /* Init TX buffers */
263         for (i = 0; i < LAN_SAA9730_BUFFERS; i++) {
264                 for (j = 0; j < LAN_SAA9730_TXM_Q_SIZE; j++) {
265                         *(unsigned int *) Pa =
266                             cpu_to_le32(TXSF_EMPTY <<
267                                         TX_STAT_CTL_OWNER_SHF);
268                         lp->TxmBuffer[i][j] = (unsigned int) Pa;
269                         Pa += TxmBufferSize;
270                 }
271         }
272
273         /* 
274          * Set rx buffer A and rx buffer B to point to the first two buffer 
275          * spaces.
276          */
277         OUTL(PHYSADDR(lp->RcvBuffer[0][0]),
278              &lp->lan_saa9730_regs->RxBuffA);
279         OUTL(PHYSADDR(lp->RcvBuffer[1][0]),
280              &lp->lan_saa9730_regs->RxBuffB);
281
282         /* Initialize Buffer Index */
283         lp->NextRcvPacketIndex = 0;
284         lp->NextRcvToUseIsA = 1;
285
286         /* Set current buffer index & next availble packet index */
287         lp->NextTxmPacketIndex = 0;
288         lp->NextTxmBufferIndex = 0;
289         lp->PendingTxmPacketIndex = 0;
290         lp->PendingTxmBufferIndex = 0;
291
292         /* 
293          * Set txm_buf_a and txm_buf_b to point to the first two buffer
294          * space 
295          */
296         OUTL(PHYSADDR(lp->TxmBuffer[0][0]),
297              &lp->lan_saa9730_regs->TxBuffA);
298         OUTL(PHYSADDR(lp->TxmBuffer[1][0]),
299              &lp->lan_saa9730_regs->TxBuffB);
300
301         /* Set packet number */
302         OUTL((lp->DmaRcvPackets << PK_COUNT_RX_A_SHF) |
303              (lp->DmaRcvPackets << PK_COUNT_RX_B_SHF) |
304              (lp->DmaTxmPackets << PK_COUNT_TX_A_SHF) |
305              (lp->DmaTxmPackets << PK_COUNT_TX_B_SHF),
306              &lp->lan_saa9730_regs->PacketCount);
307
308         return 0;
309 }
310
311 static int lan_saa9730_cam_load(struct lan_saa9730_private *lp)
312 {
313         unsigned int i;
314         unsigned char *NetworkAddress;
315
316         NetworkAddress = (unsigned char *) &lp->PhysicalAddress[0][0];
317
318         for (i = 0; i < LAN_SAA9730_CAM_DWORDS; i++) {
319                 /* First set address to where data is written */
320                 OUTL(i, &lp->lan_saa9730_regs->CamAddress);
321                 OUTL((NetworkAddress[0] << 24) | (NetworkAddress[1] << 16)
322                      | (NetworkAddress[2] << 8) | NetworkAddress[3],
323                      &lp->lan_saa9730_regs->CamData);
324                 NetworkAddress += 4;
325         }
326         return 0;
327 }
328
329 static int lan_saa9730_cam_init(struct net_device *dev)
330 {
331         struct lan_saa9730_private *lp =
332             (struct lan_saa9730_private *) dev->priv;
333         unsigned int i;
334
335         /* Copy MAC-address into all entries. */
336         for (i = 0; i < LAN_SAA9730_CAM_ENTRIES; i++) {
337                 memcpy((unsigned char *) lp->PhysicalAddress[i],
338                        (unsigned char *) dev->dev_addr, 6);
339         }
340
341         return 0;
342 }
343
344 static int lan_saa9730_mii_init(struct lan_saa9730_private *lp)
345 {
346         int i, l;
347
348         /* Check link status, spin here till station is not busy. */
349         i = 0;
350         while (INL(&lp->lan_saa9730_regs->StationMgmtCtl) & MD_CA_BUSY) {
351                 i++;
352                 if (i > 100) {
353                         printk("Error: lan_saa9730_mii_init: timeout\n");
354                         return -1;
355                 }
356                 mdelay(1);      /* wait 1 ms. */
357         }
358
359         /* Now set the control and address register. */
360         OUTL(MD_CA_BUSY | PHY_STATUS | PHY_ADDRESS << MD_CA_PHY_SHF,
361              &lp->lan_saa9730_regs->StationMgmtCtl);
362
363         /* check link status, spin here till station is not busy */
364         i = 0;
365         while (INL(&lp->lan_saa9730_regs->StationMgmtCtl) & MD_CA_BUSY) {
366                 i++;
367                 if (i > 100) {
368                         printk("Error: lan_saa9730_mii_init: timeout\n");
369                         return -1;
370                 }
371                 mdelay(1);      /* wait 1 ms. */
372         }
373
374         /* Wait for 1 ms. */
375         mdelay(1);
376
377         /* Check the link status. */
378         if (INL(&lp->lan_saa9730_regs->StationMgmtData) &
379             PHY_STATUS_LINK_UP) {
380                 /* Link is up. */
381                 return 0;
382         } else {
383                 /* Link is down, reset the PHY first. */
384
385                 /* set PHY address = 'CONTROL' */
386                 OUTL(PHY_ADDRESS << MD_CA_PHY_SHF | MD_CA_WR | PHY_CONTROL,
387                      &lp->lan_saa9730_regs->StationMgmtCtl);
388
389                 /* Wait for 1 ms. */
390                 mdelay(1);
391
392                 /* set 'CONTROL' = force reset and renegotiate */
393                 OUTL(PHY_CONTROL_RESET | PHY_CONTROL_AUTO_NEG |
394                      PHY_CONTROL_RESTART_AUTO_NEG,
395                      &lp->lan_saa9730_regs->StationMgmtData);
396
397                 /* Wait for 50 ms. */
398                 mdelay(50);
399
400                 /* set 'BUSY' to start operation */
401                 OUTL(MD_CA_BUSY | PHY_ADDRESS << MD_CA_PHY_SHF | MD_CA_WR |
402                      PHY_CONTROL, &lp->lan_saa9730_regs->StationMgmtCtl);
403
404                 /* await completion */
405                 i = 0;
406                 while (INL(&lp->lan_saa9730_regs->StationMgmtCtl) &
407                        MD_CA_BUSY) {
408                         i++;
409                         if (i > 100) {
410                                 printk
411                                     ("Error: lan_saa9730_mii_init: timeout\n");
412                                 return -1;
413                         }
414                         mdelay(1);      /* wait 1 ms. */
415                 }
416
417                 /* Wait for 1 ms. */
418                 mdelay(1);
419
420                 for (l = 0; l < 2; l++) {
421                         /* set PHY address = 'STATUS' */
422                         OUTL(MD_CA_BUSY | PHY_ADDRESS << MD_CA_PHY_SHF |
423                              PHY_STATUS,
424                              &lp->lan_saa9730_regs->StationMgmtCtl);
425
426                         /* await completion */
427                         i = 0;
428                         while (INL(&lp->lan_saa9730_regs->StationMgmtCtl) &
429                                MD_CA_BUSY) {
430                                 i++;
431                                 if (i > 100) {
432                                         printk
433                                             ("Error: lan_saa9730_mii_init: timeout\n");
434                                         return -1;
435                                 }
436                                 mdelay(1);      /* wait 1 ms. */
437                         }
438
439                         /* wait for 3 sec. */
440                         mdelay(3000);
441
442                         /* check the link status */
443                         if (INL(&lp->lan_saa9730_regs->StationMgmtData) &
444                             PHY_STATUS_LINK_UP) {
445                                 /* link is up */
446                                 break;
447                         }
448                 }
449         }
450
451         return 0;
452 }
453
454 static int lan_saa9730_control_init(struct lan_saa9730_private *lp)
455 {
456         /* Initialize DMA control register. */
457         OUTL((LANMB_ANY << DMA_CTL_MAX_XFER_SHF) |
458              (LANEND_LITTLE << DMA_CTL_ENDIAN_SHF) |
459              (LAN_SAA9730_RCV_Q_INT_THRESHOLD << DMA_CTL_RX_INT_COUNT_SHF)
460              | DMA_CTL_RX_INT_TO_EN | DMA_CTL_RX_INT_EN |
461              DMA_CTL_MAC_RX_INT_EN | DMA_CTL_MAC_TX_INT_EN,
462              &lp->lan_saa9730_regs->LanDmaCtl);
463
464         /* Initial MAC control register. */
465         OUTL((MACCM_MII << MAC_CONTROL_CONN_SHF) | MAC_CONTROL_FULL_DUP,
466              &lp->lan_saa9730_regs->MacCtl);
467
468         /* Initialize CAM control register. */
469         OUTL(CAM_CONTROL_COMP_EN | CAM_CONTROL_BROAD_ACC,
470              &lp->lan_saa9730_regs->CamCtl);
471
472         /* 
473          * Initialize CAM enable register, only turn on first entry, should
474          * contain own addr. 
475          */
476         OUTL(0x0001, &lp->lan_saa9730_regs->CamEnable);
477
478         /* Initialize Tx control register */
479         OUTL(TX_CTL_EN_COMP, &lp->lan_saa9730_regs->TxCtl);
480
481         /* Initialize Rcv control register */
482         OUTL(RX_CTL_STRIP_CRC, &lp->lan_saa9730_regs->RxCtl);
483
484         /* Reset DMA engine */
485         OUTL(DMA_TEST_SW_RESET, &lp->lan_saa9730_regs->DmaTest);
486
487         return 0;
488 }
489
490 static int lan_saa9730_stop(struct lan_saa9730_private *lp)
491 {
492         int i;
493
494         /* Stop DMA first */
495         OUTL(INL(&lp->lan_saa9730_regs->LanDmaCtl) &
496              ~(DMA_CTL_EN_TX_DMA | DMA_CTL_EN_RX_DMA),
497              &lp->lan_saa9730_regs->LanDmaCtl);
498
499         /* Set the SW Reset bits in DMA and MAC control registers */
500         OUTL(DMA_TEST_SW_RESET, &lp->lan_saa9730_regs->DmaTest);
501         OUTL(INL(&lp->lan_saa9730_regs->MacCtl) | MAC_CONTROL_RESET,
502              &lp->lan_saa9730_regs->MacCtl);
503
504         /* 
505          * Wait for MAC reset to have finished. The reset bit is auto cleared
506          * when the reset is done.
507          */
508         i = 0;
509         while (INL(&lp->lan_saa9730_regs->MacCtl) & MAC_CONTROL_RESET) {
510                 i++;
511                 if (i > 100) {
512                         printk
513                             ("Error: lan_sa9730_stop: MAC reset timeout\n");
514                         return -1;
515                 }
516                 mdelay(1);      /* wait 1 ms. */
517         }
518
519         return 0;
520 }
521
522 static int lan_saa9730_dma_init(struct lan_saa9730_private *lp)
523 {
524         /* Stop lan controller. */
525         lan_saa9730_stop(lp);
526
527         OUTL(LAN_SAA9730_DEFAULT_TIME_OUT_CNT,
528              &lp->lan_saa9730_regs->Timeout);
529
530         return 0;
531 }
532
533 static int lan_saa9730_start(struct lan_saa9730_private *lp)
534 {
535         lan_saa9730_buffer_init(lp);
536
537         /* Initialize Rx Buffer Index */
538         lp->NextRcvPacketIndex = 0;
539         lp->NextRcvToUseIsA = 1;
540
541         /* Set current buffer index & next availble packet index */
542         lp->NextTxmPacketIndex = 0;
543         lp->NextTxmBufferIndex = 0;
544         lp->PendingTxmPacketIndex = 0;
545         lp->PendingTxmBufferIndex = 0;
546
547         OUTL(INL(&lp->lan_saa9730_regs->LanDmaCtl) | DMA_CTL_EN_TX_DMA |
548              DMA_CTL_EN_RX_DMA, &lp->lan_saa9730_regs->LanDmaCtl);
549
550         /* For Tx, turn on MAC then DMA */
551         OUTL(INL(&lp->lan_saa9730_regs->TxCtl) | TX_CTL_TX_EN,
552              &lp->lan_saa9730_regs->TxCtl);
553
554         /* For Rx, turn on DMA then MAC */
555         OUTL(INL(&lp->lan_saa9730_regs->RxCtl) | RX_CTL_RX_EN,
556              &lp->lan_saa9730_regs->RxCtl);
557
558         /* Set Ok2Use to let hardware owns the buffers */
559         OUTL(OK2USE_RX_A | OK2USE_RX_B | OK2USE_TX_A | OK2USE_TX_B,
560              &lp->lan_saa9730_regs->Ok2Use);
561
562         return 0;
563 }
564
565 static int lan_saa9730_restart(struct lan_saa9730_private *lp)
566 {
567         lan_saa9730_stop(lp);
568         lan_saa9730_start(lp);
569
570         return 0;
571 }
572
573 static int lan_saa9730_tx(struct net_device *dev)
574 {
575         struct lan_saa9730_private *lp =
576             (struct lan_saa9730_private *) dev->priv;
577         unsigned int *pPacket;
578         unsigned int tx_status;
579
580         if (lan_saa9730_debug > 5)
581                 printk("lan_saa9730_tx interrupt\n");
582
583         /* Clear interrupt. */
584         OUTL(DMA_STATUS_MAC_TX_INT, &lp->lan_saa9730_regs->DmaStatus);
585
586         while (1) {
587                 pPacket =
588                     (unsigned int *) lp->TxmBuffer[lp->
589                                                    PendingTxmBufferIndex]
590                     [lp->PendingTxmPacketIndex];
591
592                 /* Get status of first packet transmitted. */
593                 tx_status = le32_to_cpu(*pPacket);
594
595                 /* Check ownership. */
596                 if ((tx_status & TX_STAT_CTL_OWNER_MSK) !=
597                     (TXSF_HWDONE << TX_STAT_CTL_OWNER_SHF)) break;
598
599                 /* Check for error. */
600                 if (tx_status & TX_STAT_CTL_ERROR_MSK) {
601                         if (lan_saa9730_debug > 1)
602                                 printk("lan_saa9730_tx: tx error = %x\n",
603                                        tx_status);
604
605                         lp->stats.tx_errors++;
606                         if (tx_status &
607                             (TX_STATUS_EX_COLL << TX_STAT_CTL_STATUS_SHF))
608                                     lp->stats.tx_aborted_errors++;
609                         if (tx_status &
610                             (TX_STATUS_LATE_COLL <<
611                              TX_STAT_CTL_STATUS_SHF)) lp->stats.
612              tx_window_errors++;
613                         if (tx_status &
614                             (TX_STATUS_L_CARR << TX_STAT_CTL_STATUS_SHF))
615                                     lp->stats.tx_carrier_errors++;
616                         if (tx_status &
617                             (TX_STATUS_UNDER << TX_STAT_CTL_STATUS_SHF))
618                                     lp->stats.tx_fifo_errors++;
619                         if (tx_status &
620                             (TX_STATUS_SQ_ERR << TX_STAT_CTL_STATUS_SHF))
621                                     lp->stats.tx_heartbeat_errors++;
622
623                         lp->stats.collisions +=
624                             tx_status & TX_STATUS_TX_COLL_MSK;
625                 }
626
627                 /* Free buffer. */
628                 *pPacket =
629                     cpu_to_le32(TXSF_EMPTY << TX_STAT_CTL_OWNER_SHF);
630
631                 /* Update pending index pointer. */
632                 lp->PendingTxmPacketIndex++;
633                 if (lp->PendingTxmPacketIndex >= LAN_SAA9730_TXM_Q_SIZE) {
634                         lp->PendingTxmPacketIndex = 0;
635                         lp->PendingTxmBufferIndex ^= 1;
636                 }
637         }
638
639         /* Make sure A and B are available to hardware. */
640         OUTL(OK2USE_TX_A | OK2USE_TX_B, &lp->lan_saa9730_regs->Ok2Use);
641
642         if (netif_queue_stopped(dev)) {
643                 /* The tx buffer is no longer full. */
644                 netif_wake_queue(dev);
645         }
646
647         return 0;
648 }
649
650 static int lan_saa9730_rx(struct net_device *dev)
651 {
652         struct lan_saa9730_private *lp =
653             (struct lan_saa9730_private *) dev->priv;
654         int len = 0;
655         struct sk_buff *skb = 0;
656         unsigned int rx_status;
657         int BufferIndex;
658         int PacketIndex;
659         unsigned int *pPacket;
660         unsigned char *pData;
661
662         if (lan_saa9730_debug > 5)
663                 printk("lan_saa9730_rx interrupt\n");
664
665         /* Clear receive interrupts. */
666         OUTL(DMA_STATUS_MAC_RX_INT | DMA_STATUS_RX_INT |
667              DMA_STATUS_RX_TO_INT, &lp->lan_saa9730_regs->DmaStatus);
668
669         /* Address next packet */
670         if (lp->NextRcvToUseIsA)
671                 BufferIndex = 0;
672         else
673                 BufferIndex = 1;
674         PacketIndex = lp->NextRcvPacketIndex;
675         pPacket = (unsigned int *) lp->RcvBuffer[BufferIndex][PacketIndex];
676         rx_status = le32_to_cpu(*pPacket);
677
678         /* Process each packet. */
679         while ((rx_status & RX_STAT_CTL_OWNER_MSK) ==
680                (RXSF_HWDONE << RX_STAT_CTL_OWNER_SHF)) {
681                 /* Check the rx status. */
682                 if (rx_status & (RX_STATUS_GOOD << RX_STAT_CTL_STATUS_SHF)) {
683                         /* Received packet is good. */
684                         len = (rx_status & RX_STAT_CTL_LENGTH_MSK) >>
685                             RX_STAT_CTL_LENGTH_SHF;
686
687                         pData = (unsigned char *) pPacket;
688                         pData += 4;
689                         skb = dev_alloc_skb(len + 2);
690                         if (skb == 0) {
691                                 printk
692                                     ("%s: Memory squeeze, deferring packet.\n",
693                                      dev->name);
694                                 lp->stats.rx_dropped++;
695                         } else {
696                                 lp->stats.rx_bytes += len;
697                                 lp->stats.rx_packets++;
698                                 skb->dev = dev;
699                                 skb_reserve(skb, 2);    /* 16 byte align */
700                                 skb_put(skb, len);      /* make room */
701                                 eth_copy_and_sum(skb,
702                                                  (unsigned char *) pData,
703                                                  len, 0);
704                                 skb->protocol = eth_type_trans(skb, dev);
705                                 netif_rx(skb);
706                                 dev->last_rx = jiffies;
707                         }
708                 } else {
709                         /* We got an error packet. */
710                         if (lan_saa9730_debug > 2)
711                                 printk
712                                     ("lan_saa9730_rx: We got an error packet = %x\n",
713                                      rx_status);
714
715                         lp->stats.rx_errors++;
716                         if (rx_status &
717                             (RX_STATUS_CRC_ERR << RX_STAT_CTL_STATUS_SHF))
718                                     lp->stats.rx_crc_errors++;
719                         if (rx_status &
720                             (RX_STATUS_ALIGN_ERR <<
721                              RX_STAT_CTL_STATUS_SHF)) lp->stats.
722              rx_frame_errors++;
723                         if (rx_status &
724                             (RX_STATUS_OVERFLOW << RX_STAT_CTL_STATUS_SHF))
725                                     lp->stats.rx_fifo_errors++;
726                         if (rx_status &
727                             (RX_STATUS_LONG_ERR << RX_STAT_CTL_STATUS_SHF))
728                                     lp->stats.rx_length_errors++;
729                 }
730
731                 /* Indicate we have processed the buffer. */
732                 *pPacket =
733                     cpu_to_le32(RXSF_READY << RX_STAT_CTL_OWNER_SHF);
734
735                 /* Go to next packet in sequence. */
736                 lp->NextRcvPacketIndex++;
737                 if (lp->NextRcvPacketIndex >= LAN_SAA9730_RCV_Q_SIZE) {
738                         lp->NextRcvPacketIndex = 0;
739                         if (BufferIndex) {
740                                 lp->NextRcvToUseIsA = 1;
741                         } else {
742                                 lp->NextRcvToUseIsA = 0;
743                         }
744                 }
745                 OUTL(OK2USE_RX_A | OK2USE_RX_B,
746                      &lp->lan_saa9730_regs->Ok2Use);
747
748                 /* Address next packet */
749                 if (lp->NextRcvToUseIsA)
750                         BufferIndex = 0;
751                 else
752                         BufferIndex = 1;
753                 PacketIndex = lp->NextRcvPacketIndex;
754                 pPacket =
755                     (unsigned int *) lp->
756                     RcvBuffer[BufferIndex][PacketIndex];
757                 rx_status = le32_to_cpu(*pPacket);
758         }
759
760         /* Make sure A and B are available to hardware. */
761         OUTL(OK2USE_RX_A | OK2USE_RX_B, &lp->lan_saa9730_regs->Ok2Use);
762
763         return 0;
764 }
765
766 static irqreturn_t lan_saa9730_interrupt(const int irq, void *dev_id,
767                                   struct pt_regs *regs)
768 {
769         struct net_device *dev = (struct net_device *) dev_id;
770         struct lan_saa9730_private *lp =
771             (struct lan_saa9730_private *) dev->priv;
772
773         if (lan_saa9730_debug > 5)
774                 printk("lan_saa9730_interrupt\n");
775
776         /* Disable the EVM LAN interrupt. */
777         evm_saa9730_block_lan_int(lp);
778
779         /* Clear the EVM LAN interrupt. */
780         evm_saa9730_clear_lan_int(lp);
781
782         /* Service pending transmit interrupts. */
783         if (INL(&lp->lan_saa9730_regs->DmaStatus) & DMA_STATUS_MAC_TX_INT)
784                 lan_saa9730_tx(dev);
785
786         /* Service pending receive interrupts. */
787         if (INL(&lp->lan_saa9730_regs->DmaStatus) &
788             (DMA_STATUS_MAC_RX_INT | DMA_STATUS_RX_INT |
789              DMA_STATUS_RX_TO_INT)) lan_saa9730_rx(dev);
790
791         /* Enable the EVM LAN interrupt. */
792         evm_saa9730_unblock_lan_int(lp);
793
794         return IRQ_HANDLED;
795 }
796
797 static int lan_saa9730_open_fail(struct net_device *dev)
798 {
799         return -ENODEV;
800 }
801
802 static int lan_saa9730_open(struct net_device *dev)
803 {
804         struct lan_saa9730_private *lp =
805             (struct lan_saa9730_private *) dev->priv;
806
807         /* Associate IRQ with lan_saa9730_interrupt */
808         if (request_irq(dev->irq, &lan_saa9730_interrupt, 0, "SAA9730 Eth",
809                         dev)) {
810                 printk("lan_saa9730_open: Can't get irq %d\n", dev->irq);
811                 return -EAGAIN;
812         }
813
814         /* Enable the Lan interrupt in the event manager. */
815         evm_saa9730_enable_lan_int(lp);
816
817         /* Start the LAN controller */
818         if (lan_saa9730_start(lp))
819                 return -1;
820
821         netif_start_queue(dev);
822
823         return 0;
824 }
825
826 static int lan_saa9730_write(struct lan_saa9730_private *lp,
827                              struct sk_buff *skb, int skblen)
828 {
829         unsigned char *pbData = skb->data;
830         unsigned int len = skblen;
831         unsigned char *pbPacketData;
832         unsigned int tx_status;
833         int BufferIndex;
834         int PacketIndex;
835
836         if (lan_saa9730_debug > 5)
837                 printk("lan_saa9730_write: skb=%08x\n",
838                        (unsigned int) skb);
839
840         BufferIndex = lp->NextTxmBufferIndex;
841         PacketIndex = lp->NextTxmPacketIndex;
842
843         tx_status =
844             le32_to_cpu(*(unsigned int *) lp->
845                         TxmBuffer[BufferIndex][PacketIndex]);
846         if ((tx_status & TX_STAT_CTL_OWNER_MSK) !=
847             (TXSF_EMPTY << TX_STAT_CTL_OWNER_SHF)) {
848                 if (lan_saa9730_debug > 4)
849                         printk
850                             ("lan_saa9730_write: Tx buffer not available: tx_status = %x\n",
851                              tx_status);
852                 return -1;
853         }
854
855         lp->NextTxmPacketIndex++;
856         if (lp->NextTxmPacketIndex >= LAN_SAA9730_TXM_Q_SIZE) {
857                 lp->NextTxmPacketIndex = 0;
858                 lp->NextTxmBufferIndex ^= 1;
859         }
860
861         pbPacketData =
862             (unsigned char *) lp->TxmBuffer[BufferIndex][PacketIndex];
863         pbPacketData += 4;
864
865         /* copy the bits */
866         memcpy(pbPacketData, pbData, len);
867
868         /* Set transmit status for hardware */
869         *(unsigned int *) lp->TxmBuffer[BufferIndex][PacketIndex] =
870             cpu_to_le32((TXSF_READY << TX_STAT_CTL_OWNER_SHF) |
871                         (TX_STAT_CTL_INT_AFTER_TX << TX_STAT_CTL_FRAME_SHF)
872                         | (len << TX_STAT_CTL_LENGTH_SHF));
873
874         /* Set hardware tx buffer. */
875         OUTL(OK2USE_TX_A | OK2USE_TX_B, &lp->lan_saa9730_regs->Ok2Use);
876
877         return 0;
878 }
879
880 static void lan_saa9730_tx_timeout(struct net_device *dev)
881 {
882         struct lan_saa9730_private *lp =
883             (struct lan_saa9730_private *) dev->priv;
884
885         /* Transmitter timeout, serious problems */
886         lp->stats.tx_errors++;
887         printk("%s: transmit timed out, reset\n", dev->name);
888         /*show_saa9730_regs(lp); */
889         lan_saa9730_restart(lp);
890
891         dev->trans_start = jiffies;
892         netif_start_queue(dev);
893 }
894
895 static int lan_saa9730_start_xmit(struct sk_buff *skb,
896                                   struct net_device *dev)
897 {
898         struct lan_saa9730_private *lp =
899             (struct lan_saa9730_private *) dev->priv;
900         unsigned long flags;
901         int skblen;
902         int len;
903
904         if (lan_saa9730_debug > 4)
905                 printk("Send packet: skb=%08x\n", (unsigned int) skb);
906
907         skblen = skb->len;
908
909         spin_lock_irqsave(&lp->lock, flags);
910
911         len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
912
913         if (lan_saa9730_write(lp, skb, skblen)) {
914                 spin_unlock_irqrestore(&lp->lock, flags);
915                 printk("Error when writing packet to controller: skb=%08x\n",
916                      (unsigned int) skb);
917                 netif_stop_queue(dev);
918                 return -1;
919         }
920
921         lp->stats.tx_bytes += len;
922         lp->stats.tx_packets++;
923
924         dev->trans_start = jiffies;
925         netif_start_queue(dev);
926         dev_kfree_skb(skb);
927
928         spin_unlock_irqrestore(&lp->lock, flags);
929
930         return 0;
931 }
932
933 static int lan_saa9730_close(struct net_device *dev)
934 {
935         struct lan_saa9730_private *lp =
936             (struct lan_saa9730_private *) dev->priv;
937
938         if (lan_saa9730_debug > 1)
939                 printk("lan_saa9730_close:\n");
940
941         netif_stop_queue(dev);
942
943         /* Disable the Lan interrupt in the event manager. */
944         evm_saa9730_disable_lan_int(lp);
945
946         /* Stop the controller */
947         if (lan_saa9730_stop(lp))
948                 return -1;
949
950         free_irq(dev->irq, (void *) dev);
951
952         return 0;
953 }
954
955 static struct net_device_stats *lan_saa9730_get_stats(struct net_device
956                                                       *dev)
957 {
958         struct lan_saa9730_private *lp =
959             (struct lan_saa9730_private *) dev->priv;
960
961         return &lp->stats;
962 }
963
964 static void lan_saa9730_set_multicast(struct net_device *dev)
965 {
966         struct lan_saa9730_private *lp =
967             (struct lan_saa9730_private *) dev->priv;
968
969         /* Stop the controller */
970         lan_saa9730_stop(lp);
971
972         if (dev->flags & IFF_PROMISC) {
973                 /* accept all packets */
974                 OUTL(CAM_CONTROL_COMP_EN | CAM_CONTROL_STATION_ACC |
975                      CAM_CONTROL_GROUP_ACC | CAM_CONTROL_BROAD_ACC,
976                      &lp->lan_saa9730_regs->CamCtl);
977         } else {
978                 if (dev->flags & IFF_ALLMULTI) {
979                         /* accept all multicast packets */
980                         OUTL(CAM_CONTROL_COMP_EN | CAM_CONTROL_GROUP_ACC |
981                              CAM_CONTROL_BROAD_ACC,
982                              &lp->lan_saa9730_regs->CamCtl);
983                 } else {
984                         /* 
985                          * Will handle the multicast stuff later. -carstenl
986                          */
987                 }
988         }
989
990         lan_saa9730_restart(lp);
991 }
992
993
994 static void __devexit saa9730_remove_one(struct pci_dev *pdev)
995 {
996         struct net_device *dev = pci_get_drvdata(pdev);
997
998         if (dev) {
999                 unregister_netdev(dev);
1000
1001                 if (dev->priv)
1002                         kfree(dev->priv);
1003
1004                 free_netdev(dev);
1005                 pci_release_regions(pdev);
1006                 pci_disable_device(pdev);
1007                 pci_set_drvdata(pdev, NULL);
1008         }
1009 }
1010
1011
1012 static int lan_saa9730_init(struct net_device *dev, int ioaddr, int irq)
1013 {
1014         struct lan_saa9730_private *lp;
1015         unsigned char ethernet_addr[6];
1016         int ret = 0;
1017
1018         dev->open = lan_saa9730_open_fail;
1019
1020         if (get_ethernet_addr(ethernet_addr))
1021                 return -ENODEV;
1022         
1023         memcpy(dev->dev_addr, ethernet_addr, 6);
1024         dev->base_addr = ioaddr;
1025         dev->irq = irq;
1026         
1027         /* 
1028          * Make certain the data structures used by the controller are aligned 
1029          * and DMAble. 
1030          */
1031         /*
1032          *  XXX: that is obviously broken - kfree() won't be happy with us.
1033          */
1034         lp = (struct lan_saa9730_private *) (((unsigned long)
1035                                               kmalloc(sizeof(*lp) + 7,
1036                                                       GFP_DMA | GFP_KERNEL)
1037                                               + 7) & ~7);
1038
1039         if (!lp)
1040                 return -ENOMEM;
1041
1042         dev->priv = lp;
1043         memset(lp, 0, sizeof(*lp));
1044
1045         /* Set SAA9730 LAN base address. */
1046         lp->lan_saa9730_regs = (t_lan_saa9730_regmap *) (ioaddr +
1047                                                          SAA9730_LAN_REGS_ADDR);
1048
1049         /* Set SAA9730 EVM base address. */
1050         lp->evm_saa9730_regs = (t_evm_saa9730_regmap *) (ioaddr +
1051                                                          SAA9730_EVM_REGS_ADDR);
1052
1053         /* Allocate LAN RX/TX frame buffer space. */
1054         /* FIXME: a leak */
1055         if ((ret = lan_saa9730_allocate_buffers(lp)))
1056                 goto out;
1057
1058         /* Stop LAN controller. */
1059         if ((ret = lan_saa9730_stop(lp))) 
1060                 goto out;
1061         
1062         /* Initialize CAM registers. */
1063         if ((ret = lan_saa9730_cam_init(dev)))
1064                 goto out;
1065
1066         /* Initialize MII registers. */
1067         if ((ret = lan_saa9730_mii_init(lp)))
1068                 goto out;
1069
1070         /* Initialize control registers. */
1071         if ((ret = lan_saa9730_control_init(lp))) 
1072                 goto out;
1073         
1074         /* Load CAM registers. */
1075         if ((ret = lan_saa9730_cam_load(lp))) 
1076                 goto out;
1077         
1078         /* Initialize DMA context registers. */
1079         if ((ret = lan_saa9730_dma_init(lp)))
1080                 goto out;
1081         
1082         spin_lock_init(&lp->lock);
1083                 
1084         dev->open = lan_saa9730_open;
1085         dev->hard_start_xmit = lan_saa9730_start_xmit;
1086         dev->stop = lan_saa9730_close;
1087         dev->get_stats = lan_saa9730_get_stats;
1088         dev->set_multicast_list = lan_saa9730_set_multicast;
1089         dev->tx_timeout = lan_saa9730_tx_timeout;
1090         dev->watchdog_timeo = (HZ >> 1);
1091         dev->dma = 0;
1092         
1093         ret = register_netdev(dev);
1094         if (ret)
1095                 goto out;
1096         return 0;
1097
1098  out:
1099         if (dev->priv)
1100                 kfree(dev->priv);
1101         return ret;
1102 }
1103
1104
1105 static int __devinit saa9730_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
1106 {
1107         struct net_device *dev;
1108         unsigned int pci_ioaddr;
1109         int err;
1110
1111         if (lan_saa9730_debug > 1)
1112                 printk("saa9730.c: PCI bios is present, checking for devices...\n");
1113
1114         err = -ENOMEM;
1115         dev = alloc_etherdev(0);
1116         if (!dev)
1117                 goto out;
1118
1119         SET_MODULE_OWNER(dev);
1120
1121         err = pci_enable_device(pdev);
1122         if (err) {
1123                 printk(KERN_ERR "Cannot enable PCI device, aborting.\n");
1124                 goto out1;
1125         }
1126
1127         err = pci_request_regions(pdev, DRV_MODULE_NAME);
1128         if (err) {
1129                 printk(KERN_ERR "Cannot obtain PCI resources, aborting.\n");
1130                 goto out2;
1131         }
1132
1133         pci_irq_line = pdev->irq;
1134         /* LAN base address in located at BAR 1. */
1135
1136         pci_ioaddr = pci_resource_start(pdev, 1);
1137         pci_set_master(pdev);
1138
1139         printk("Found SAA9730 (PCI) at %#x, irq %d.\n",
1140                pci_ioaddr, pci_irq_line);
1141
1142         err = lan_saa9730_init(dev, pci_ioaddr, pci_irq_line);
1143         if (err) {
1144                 printk("Lan init failed");
1145                 goto out2;
1146         }
1147
1148         pci_set_drvdata(pdev, dev);
1149         SET_NETDEV_DEV(dev, &pdev->dev);
1150         return 0;
1151         
1152 out2:
1153         pci_disable_device(pdev);
1154 out1:
1155         free_netdev(dev);
1156 out:
1157         return err;
1158 }
1159
1160
1161 static struct pci_driver saa9730_driver = {
1162         .name           = DRV_MODULE_NAME,
1163         .id_table       = saa9730_pci_tbl,
1164         .probe          = saa9730_init_one,
1165         .remove         = __devexit_p(saa9730_remove_one),
1166 };
1167
1168
1169 static int __init saa9730_init(void)
1170 {
1171         return pci_module_init(&saa9730_driver);
1172 }
1173
1174 static void __exit saa9730_cleanup(void)
1175 {
1176         pci_unregister_driver(&saa9730_driver);
1177 }
1178
1179 module_init(saa9730_init);
1180 module_exit(saa9730_cleanup);
1181
1182
1183
1184 MODULE_LICENSE("GPL");