2 * Ethernet driver for Motorola MPC8xx.
3 * Copyright (c) 1997 Dan Malek (dmalek@jlc.net)
5 * I copied the basic skeleton from the lance driver, because I did not
6 * know how to write the Linux driver, but I did know how the LANCE worked.
8 * This version of the driver is somewhat selectable for the different
9 * processor/board combinations. It works for the boards I know about
10 * now, and should be easily modified to include others. Some of the
11 * configuration information is contained in <asm/commproc.h> and the
14 * Buffer descriptors are kept in the CPM dual port RAM, and the frame
15 * buffers are in the host memory.
17 * Right now, I am very watseful with the buffers. I allocate memory
18 * pages and then divide them into 2K frame buffers. This way I know I
19 * have buffers large enough to hold one frame within one buffer descriptor.
20 * Once I get this working, I will use 64 or 128 byte CPM buffers, which
21 * will be much more memory efficient and will easily handle lots of
25 #include <linux/config.h>
26 #include <linux/kernel.h>
27 #include <linux/sched.h>
28 #include <linux/string.h>
29 #include <linux/ptrace.h>
30 #include <linux/errno.h>
31 #include <linux/ioport.h>
32 #include <linux/slab.h>
33 #include <linux/interrupt.h>
34 #include <linux/pci.h>
35 #include <linux/init.h>
36 #include <linux/delay.h>
37 #include <linux/netdevice.h>
38 #include <linux/etherdevice.h>
39 #include <linux/skbuff.h>
40 #include <linux/spinlock.h>
41 #include <linux/dma-mapping.h>
42 #include <linux/bitops.h>
44 #include <asm/8xx_immap.h>
45 #include <asm/pgtable.h>
46 #include <asm/mpc8xx.h>
47 #include <asm/uaccess.h>
48 #include <asm/commproc.h>
53 * The MPC8xx CPM performs the Ethernet processing on SCC1. It can use
54 * an aribtrary number of buffers on byte boundaries, but must have at
55 * least two receive buffers to prevent constant overrun conditions.
57 * The buffer descriptors are allocated from the CPM dual port memory
58 * with the data buffers allocated from host memory, just like all other
59 * serial communication protocols. The host memory buffers are allocated
60 * from the free page pool, and then divided into smaller receive and
61 * transmit buffers. The size of the buffers should be a power of two,
62 * since that nicely divides the page. This creates a ring buffer
63 * structure similar to the LANCE and other controllers.
65 * Like the LANCE driver:
66 * The driver runs as two independent, single-threaded flows of control. One
67 * is the send-packet routine, which enforces single-threaded use by the
68 * cep->tx_busy flag. The other thread is the interrupt handler, which is
69 * single threaded by the hardware and other software.
71 * The send packet thread has partial control over the Tx ring and the
72 * 'cep->tx_busy' flag. It sets the tx_busy flag whenever it's queuing a Tx
73 * packet. If the next queue slot is empty, it clears the tx_busy flag when
74 * finished otherwise it sets the 'lp->tx_full' flag.
76 * The MBX has a control register external to the MPC8xx that has some
77 * control of the Ethernet interface. Information is in the manual for
80 * The RPX boards have an external control/status register. Consult the
81 * programming documents for details unique to your board.
83 * For the TQM8xx(L) modules, there is no control register interface.
84 * All functions are directly controlled using I/O pins. See <asm/commproc.h>.
87 /* The transmitter timeout
89 #define TX_TIMEOUT (2*HZ)
91 /* The number of Tx and Rx buffers. These are allocated from the page
92 * pool. The code may assume these are power of two, so it is best
93 * to keep them that size.
94 * We don't need to allocate pages for the transmitter. We just use
95 * the skbuffer directly.
97 #ifdef CONFIG_ENET_BIG_BUFFERS
98 #define CPM_ENET_RX_PAGES 32
99 #define CPM_ENET_RX_FRSIZE 2048
100 #define CPM_ENET_RX_FRPPG (PAGE_SIZE / CPM_ENET_RX_FRSIZE)
101 #define RX_RING_SIZE (CPM_ENET_RX_FRPPG * CPM_ENET_RX_PAGES)
102 #define TX_RING_SIZE 64 /* Must be power of two */
103 #define TX_RING_MOD_MASK 63 /* for this to work */
105 #define CPM_ENET_RX_PAGES 4
106 #define CPM_ENET_RX_FRSIZE 2048
107 #define CPM_ENET_RX_FRPPG (PAGE_SIZE / CPM_ENET_RX_FRSIZE)
108 #define RX_RING_SIZE (CPM_ENET_RX_FRPPG * CPM_ENET_RX_PAGES)
109 #define TX_RING_SIZE 8 /* Must be power of two */
110 #define TX_RING_MOD_MASK 7 /* for this to work */
113 /* The CPM stores dest/src/type, data, and checksum for receive packets.
115 #define PKT_MAXBUF_SIZE 1518
116 #define PKT_MINBUF_SIZE 64
117 #define PKT_MAXBLR_SIZE 1520
119 /* The CPM buffer descriptors track the ring buffers. The rx_bd_base and
120 * tx_bd_base always point to the base of the buffer descriptors. The
121 * cur_rx and cur_tx point to the currently available buffer.
122 * The dirty_tx tracks the current buffer that is being sent by the
123 * controller. The cur_tx and dirty_tx are equal under both completely
124 * empty and completely full conditions. The empty/ready indicator in
125 * the buffer descriptor determines the actual condition.
127 struct scc_enet_private {
128 /* The saved address of a sent-in-place packet/buffer, for skfree(). */
129 struct sk_buff* tx_skbuff[TX_RING_SIZE];
133 /* CPM dual port RAM relative addresses.
135 cbd_t *rx_bd_base; /* Address of Rx and Tx buffers. */
137 cbd_t *cur_rx, *cur_tx; /* The next free ring entry */
138 cbd_t *dirty_tx; /* The ring entries to be free()ed. */
141 /* Virtual addresses for the receive buffers because we can't
142 * do a __va() on them anymore.
144 unsigned char *rx_vaddr[RX_RING_SIZE];
145 struct net_device_stats stats;
150 static int scc_enet_open(struct net_device *dev);
151 static int scc_enet_start_xmit(struct sk_buff *skb, struct net_device *dev);
152 static int scc_enet_rx(struct net_device *dev);
153 static void scc_enet_interrupt(void *dev_id, struct pt_regs *regs);
154 static int scc_enet_close(struct net_device *dev);
155 static struct net_device_stats *scc_enet_get_stats(struct net_device *dev);
156 static void set_multicast_list(struct net_device *dev);
158 /* Get this from various configuration locations (depends on board).
160 /*static ushort my_enet_addr[] = { 0x0800, 0x3e26, 0x1559 };*/
162 /* Typically, 860(T) boards use SCC1 for Ethernet, and other 8xx boards
163 * use SCC2. Some even may use SCC3.
164 * This is easily extended if necessary.
166 #if defined(CONFIG_SCC3_ENET)
167 #define CPM_CR_ENET CPM_CR_CH_SCC3
168 #define PROFF_ENET PROFF_SCC3
169 #define SCC_ENET 2 /* Index, not number! */
170 #define CPMVEC_ENET CPMVEC_SCC3
171 #elif defined(CONFIG_SCC2_ENET)
172 #define CPM_CR_ENET CPM_CR_CH_SCC2
173 #define PROFF_ENET PROFF_SCC2
174 #define SCC_ENET 1 /* Index, not number! */
175 #define CPMVEC_ENET CPMVEC_SCC2
176 #elif defined(CONFIG_SCC1_ENET)
177 #define CPM_CR_ENET CPM_CR_CH_SCC1
178 #define PROFF_ENET PROFF_SCC1
179 #define SCC_ENET 0 /* Index, not number! */
180 #define CPMVEC_ENET CPMVEC_SCC1
182 #error CONFIG_SCCx_ENET not defined
186 scc_enet_open(struct net_device *dev)
189 /* I should reset the ring buffers here, but I don't yet know
190 * a simple way to do that.
193 netif_start_queue(dev);
194 return 0; /* Always succeed */
198 scc_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
200 struct scc_enet_private *cep = (struct scc_enet_private *)dev->priv;
203 /* Fill in a Tx ring entry */
206 #ifndef final_version
207 if (bdp->cbd_sc & BD_ENET_TX_READY) {
208 /* Ooops. All transmit buffers are full. Bail out.
209 * This should not happen, since cep->tx_busy should be set.
211 printk("%s: tx queue full!.\n", dev->name);
216 /* Clear all of the status flags.
218 bdp->cbd_sc &= ~BD_ENET_TX_STATS;
220 /* If the frame is short, tell CPM to pad it.
222 if (skb->len <= ETH_ZLEN)
223 bdp->cbd_sc |= BD_ENET_TX_PAD;
225 bdp->cbd_sc &= ~BD_ENET_TX_PAD;
227 /* Set buffer length and buffer pointer.
229 bdp->cbd_datlen = skb->len;
230 bdp->cbd_bufaddr = __pa(skb->data);
234 cep->tx_skbuff[cep->skb_cur] = skb;
236 cep->stats.tx_bytes += skb->len;
237 cep->skb_cur = (cep->skb_cur+1) & TX_RING_MOD_MASK;
239 /* Push the data cache so the CPM does not get stale memory
242 flush_dcache_range((unsigned long)(skb->data),
243 (unsigned long)(skb->data + skb->len));
245 spin_lock_irq(&cep->lock);
247 /* Send it on its way. Tell CPM its ready, interrupt when done,
248 * its the last BD of the frame, and to put the CRC on the end.
250 bdp->cbd_sc |= (BD_ENET_TX_READY | BD_ENET_TX_INTR | BD_ENET_TX_LAST | BD_ENET_TX_TC);
252 dev->trans_start = jiffies;
254 /* If this was the last BD in the ring, start at the beginning again.
256 if (bdp->cbd_sc & BD_ENET_TX_WRAP)
257 bdp = cep->tx_bd_base;
261 if (bdp->cbd_sc & BD_ENET_TX_READY) {
262 netif_stop_queue(dev);
266 cep->cur_tx = (cbd_t *)bdp;
268 spin_unlock_irq(&cep->lock);
274 scc_enet_timeout(struct net_device *dev)
276 struct scc_enet_private *cep = (struct scc_enet_private *)dev->priv;
278 printk("%s: transmit timed out.\n", dev->name);
279 cep->stats.tx_errors++;
280 #ifndef final_version
284 printk(" Ring data dump: cur_tx %p%s cur_rx %p.\n",
285 cep->cur_tx, cep->tx_full ? " (full)" : "",
287 bdp = cep->tx_bd_base;
288 for (i = 0 ; i < TX_RING_SIZE; i++, bdp++)
289 printk("%04x %04x %08x\n",
293 bdp = cep->rx_bd_base;
294 for (i = 0 ; i < RX_RING_SIZE; i++, bdp++)
295 printk("%04x %04x %08x\n",
302 netif_wake_queue(dev);
305 /* The interrupt handler.
306 * This is called from the CPM handler, not the MPC core interrupt.
309 scc_enet_interrupt(void *dev_id, struct pt_regs *regs)
311 struct net_device *dev = dev_id;
312 volatile struct scc_enet_private *cep;
317 cep = (struct scc_enet_private *)dev->priv;
319 /* Get the interrupt events that caused us to be here.
321 int_events = cep->sccp->scc_scce;
322 cep->sccp->scc_scce = int_events;
325 /* Handle receive event in its own function.
327 if (int_events & SCCE_ENET_RXF)
330 /* Check for a transmit error. The manual is a little unclear
331 * about this, so the debug code until I get it figured out. It
332 * appears that if TXE is set, then TXB is not set. However,
333 * if carrier sense is lost during frame transmission, the TXE
334 * bit is set, "and continues the buffer transmission normally."
335 * I don't know if "normally" implies TXB is set when the buffer
336 * descriptor is closed.....trial and error :-).
339 /* Transmit OK, or non-fatal error. Update the buffer descriptors.
341 if (int_events & (SCCE_ENET_TXE | SCCE_ENET_TXB)) {
342 spin_lock(&cep->lock);
344 while ((bdp->cbd_sc&BD_ENET_TX_READY)==0) {
345 if ((bdp==cep->cur_tx) && (cep->tx_full == 0))
348 if (bdp->cbd_sc & BD_ENET_TX_HB) /* No heartbeat */
349 cep->stats.tx_heartbeat_errors++;
350 if (bdp->cbd_sc & BD_ENET_TX_LC) /* Late collision */
351 cep->stats.tx_window_errors++;
352 if (bdp->cbd_sc & BD_ENET_TX_RL) /* Retrans limit */
353 cep->stats.tx_aborted_errors++;
354 if (bdp->cbd_sc & BD_ENET_TX_UN) /* Underrun */
355 cep->stats.tx_fifo_errors++;
356 if (bdp->cbd_sc & BD_ENET_TX_CSL) /* Carrier lost */
357 cep->stats.tx_carrier_errors++;
360 /* No heartbeat or Lost carrier are not really bad errors.
361 * The others require a restart transmit command.
364 (BD_ENET_TX_LC | BD_ENET_TX_RL | BD_ENET_TX_UN)) {
366 cep->stats.tx_errors++;
369 cep->stats.tx_packets++;
371 /* Deferred means some collisions occurred during transmit,
372 * but we eventually sent the packet OK.
374 if (bdp->cbd_sc & BD_ENET_TX_DEF)
375 cep->stats.collisions++;
377 /* Free the sk buffer associated with this last transmit.
379 dev_kfree_skb_irq(cep->tx_skbuff[cep->skb_dirty]);
380 cep->skb_dirty = (cep->skb_dirty + 1) & TX_RING_MOD_MASK;
382 /* Update pointer to next buffer descriptor to be transmitted.
384 if (bdp->cbd_sc & BD_ENET_TX_WRAP)
385 bdp = cep->tx_bd_base;
389 /* I don't know if we can be held off from processing these
390 * interrupts for more than one frame time. I really hope
391 * not. In such a case, we would now want to check the
392 * currently available BD (cur_tx) and determine if any
393 * buffers between the dirty_tx and cur_tx have also been
394 * sent. We would want to process anything in between that
395 * does not have BD_ENET_TX_READY set.
398 /* Since we have freed up a buffer, the ring is no longer
403 if (netif_queue_stopped(dev))
404 netif_wake_queue(dev);
407 cep->dirty_tx = (cbd_t *)bdp;
411 volatile cpm8xx_t *cp;
413 /* Some transmit errors cause the transmitter to shut
414 * down. We now issue a restart transmit. Since the
415 * errors close the BD and update the pointers, the restart
416 * _should_ pick up without having to reset any of our
421 mk_cr_cmd(CPM_CR_ENET, CPM_CR_RESTART_TX) | CPM_CR_FLG;
422 while (cp->cp_cpcr & CPM_CR_FLG);
424 spin_unlock(&cep->lock);
427 /* Check for receive busy, i.e. packets coming but no place to
428 * put them. This "can't happen" because the receive interrupt
429 * is tossing previous frames.
431 if (int_events & SCCE_ENET_BSY) {
432 cep->stats.rx_dropped++;
433 printk("CPM ENET: BSY can't happen.\n");
439 /* During a receive, the cur_rx points to the current incoming buffer.
440 * When we update through the ring, if the next incoming buffer has
441 * not been given to the system, we just set the empty indicator,
442 * effectively tossing the packet.
445 scc_enet_rx(struct net_device *dev)
447 struct scc_enet_private *cep;
452 cep = (struct scc_enet_private *)dev->priv;
454 /* First, grab all of the stats for the incoming packet.
455 * These get messed up if we get called due to a busy condition.
460 if (bdp->cbd_sc & BD_ENET_RX_EMPTY)
463 #ifndef final_version
464 /* Since we have allocated space to hold a complete frame, both
465 * the first and last indicators should be set.
467 if ((bdp->cbd_sc & (BD_ENET_RX_FIRST | BD_ENET_RX_LAST)) !=
468 (BD_ENET_RX_FIRST | BD_ENET_RX_LAST))
469 printk("CPM ENET: rcv is not first+last\n");
472 /* Frame too long or too short.
474 if (bdp->cbd_sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
475 cep->stats.rx_length_errors++;
476 if (bdp->cbd_sc & BD_ENET_RX_NO) /* Frame alignment */
477 cep->stats.rx_frame_errors++;
478 if (bdp->cbd_sc & BD_ENET_RX_CR) /* CRC Error */
479 cep->stats.rx_crc_errors++;
480 if (bdp->cbd_sc & BD_ENET_RX_OV) /* FIFO overrun */
481 cep->stats.rx_crc_errors++;
483 /* Report late collisions as a frame error.
484 * On this error, the BD is closed, but we don't know what we
485 * have in the buffer. So, just drop this frame on the floor.
487 if (bdp->cbd_sc & BD_ENET_RX_CL) {
488 cep->stats.rx_frame_errors++;
492 /* Process the incoming frame.
494 cep->stats.rx_packets++;
495 pkt_len = bdp->cbd_datlen;
496 cep->stats.rx_bytes += pkt_len;
498 /* This does 16 byte alignment, much more than we need.
499 * The packet length includes FCS, but we don't want to
500 * include that when passing upstream as it messes up
501 * bridging applications.
503 skb = dev_alloc_skb(pkt_len-4);
506 printk("%s: Memory squeeze, dropping packet.\n", dev->name);
507 cep->stats.rx_dropped++;
511 skb_put(skb,pkt_len-4); /* Make room */
512 eth_copy_and_sum(skb,
513 cep->rx_vaddr[bdp - cep->rx_bd_base],
515 skb->protocol=eth_type_trans(skb,dev);
520 /* Clear the status flags for this buffer.
522 bdp->cbd_sc &= ~BD_ENET_RX_STATS;
524 /* Mark the buffer empty.
526 bdp->cbd_sc |= BD_ENET_RX_EMPTY;
528 /* Update BD pointer to next entry.
530 if (bdp->cbd_sc & BD_ENET_RX_WRAP)
531 bdp = cep->rx_bd_base;
536 cep->cur_rx = (cbd_t *)bdp;
542 scc_enet_close(struct net_device *dev)
544 /* Don't know what to do yet.
546 netif_stop_queue(dev);
551 static struct net_device_stats *scc_enet_get_stats(struct net_device *dev)
553 struct scc_enet_private *cep = (struct scc_enet_private *)dev->priv;
558 /* Set or clear the multicast filter for this adaptor.
559 * Skeleton taken from sunlance driver.
560 * The CPM Ethernet implementation allows Multicast as well as individual
561 * MAC address filtering. Some of the drivers check to make sure it is
562 * a group multicast address, and discard those that are not. I guess I
563 * will do the same for now, but just remove the test if you want
564 * individual filtering as well (do the upper net layers want or support
565 * this kind of feature?).
568 static void set_multicast_list(struct net_device *dev)
570 struct scc_enet_private *cep;
571 struct dev_mc_list *dmi;
572 u_char *mcptr, *tdptr;
573 volatile scc_enet_t *ep;
575 cep = (struct scc_enet_private *)dev->priv;
577 /* Get pointer to SCC area in parameter RAM.
579 ep = (scc_enet_t *)dev->base_addr;
581 if (dev->flags&IFF_PROMISC) {
583 /* Log any net taps. */
584 printk("%s: Promiscuous mode enabled.\n", dev->name);
585 cep->sccp->scc_psmr |= SCC_PSMR_PRO;
588 cep->sccp->scc_psmr &= ~SCC_PSMR_PRO;
590 if (dev->flags & IFF_ALLMULTI) {
591 /* Catch all multicast addresses, so set the
594 ep->sen_gaddr1 = 0xffff;
595 ep->sen_gaddr2 = 0xffff;
596 ep->sen_gaddr3 = 0xffff;
597 ep->sen_gaddr4 = 0xffff;
600 /* Clear filter and add the addresses in the list.
609 for (i=0; i<dev->mc_count; i++) {
611 /* Only support group multicast for now.
613 if (!(dmi->dmi_addr[0] & 1))
616 /* The address in dmi_addr is LSB first,
617 * and taddr is MSB first. We have to
618 * copy bytes MSB first from dmi_addr.
620 mcptr = (u_char *)dmi->dmi_addr + 5;
621 tdptr = (u_char *)&ep->sen_taddrh;
625 /* Ask CPM to run CRC and set bit in
628 cpmp->cp_cpcr = mk_cr_cmd(CPM_CR_ENET, CPM_CR_SET_GADDR) | CPM_CR_FLG;
629 /* this delay is necessary here -- Cort */
631 while (cpmp->cp_cpcr & CPM_CR_FLG);
637 /* Initialize the CPM Ethernet on SCC. If EPPC-Bug loaded us, or performed
638 * some other network I/O, a whole bunch of this has already been set up.
639 * It is no big deal if we do it again, we just have to disable the
640 * transmit and receive to make sure we don't catch the CPM with some
641 * inconsistent control information.
643 static int __init scc_enet_init(void)
645 struct net_device *dev;
646 struct scc_enet_private *cep;
649 unsigned char *eap, *ba;
653 volatile cpm8xx_t *cp;
654 volatile scc_t *sccp;
655 volatile scc_enet_t *ep;
656 volatile immap_t *immap;
658 cp = cpmp; /* Get pointer to Communication Processor */
660 immap = (immap_t *)(mfspr(SPRN_IMMR) & 0xFFFF0000); /* and to internal registers */
664 dev = alloc_etherdev(sizeof(*cep));
669 spin_lock_init(&cep->lock);
671 /* Get pointer to SCC area in parameter RAM.
673 ep = (scc_enet_t *)(&cp->cp_dparam[PROFF_ENET]);
675 /* And another to the SCC register area.
677 sccp = (volatile scc_t *)(&cp->cp_scc[SCC_ENET]);
678 cep->sccp = (scc_t *)sccp; /* Keep the pointer handy */
680 /* Disable receive and transmit in case EPPC-Bug started it.
682 sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
684 /* Cookbook style from the MPC860 manual.....
685 * Not all of this is necessary if EPPC-Bug has initialized
687 * So far we are lucky, all board configurations use the same
688 * pins, or at least the same I/O Port for these functions.....
689 * It can't last though......
692 #if (defined(PA_ENET_RXD) && defined(PA_ENET_TXD))
693 /* Configure port A pins for Txd and Rxd.
695 immap->im_ioport.iop_papar |= (PA_ENET_RXD | PA_ENET_TXD);
696 immap->im_ioport.iop_padir &= ~(PA_ENET_RXD | PA_ENET_TXD);
697 immap->im_ioport.iop_paodr &= ~PA_ENET_TXD;
698 #elif (defined(PB_ENET_RXD) && defined(PB_ENET_TXD))
699 /* Configure port B pins for Txd and Rxd.
701 immap->im_cpm.cp_pbpar |= (PB_ENET_RXD | PB_ENET_TXD);
702 immap->im_cpm.cp_pbdir &= ~(PB_ENET_RXD | PB_ENET_TXD);
703 immap->im_cpm.cp_pbodr &= ~PB_ENET_TXD;
705 #error Exactly ONE pair of PA_ENET_[RT]XD, PB_ENET_[RT]XD must be defined
708 #if defined(PC_ENET_LBK)
709 /* Configure port C pins to disable External Loopback
711 immap->im_ioport.iop_pcpar &= ~PC_ENET_LBK;
712 immap->im_ioport.iop_pcdir |= PC_ENET_LBK;
713 immap->im_ioport.iop_pcso &= ~PC_ENET_LBK;
714 immap->im_ioport.iop_pcdat &= ~PC_ENET_LBK; /* Disable Loopback */
715 #endif /* PC_ENET_LBK */
718 /* Configure port E for TCLK and RCLK.
720 cp->cp_pepar |= (PE_ENET_TCLK | PE_ENET_RCLK);
721 cp->cp_pedir &= ~(PE_ENET_TCLK | PE_ENET_RCLK);
722 cp->cp_peso &= ~(PE_ENET_TCLK | PE_ENET_RCLK);
724 /* Configure port A for TCLK and RCLK.
726 immap->im_ioport.iop_papar |= (PA_ENET_TCLK | PA_ENET_RCLK);
727 immap->im_ioport.iop_padir &= ~(PA_ENET_TCLK | PA_ENET_RCLK);
730 /* Configure port C pins to enable CLSN and RENA.
732 immap->im_ioport.iop_pcpar &= ~(PC_ENET_CLSN | PC_ENET_RENA);
733 immap->im_ioport.iop_pcdir &= ~(PC_ENET_CLSN | PC_ENET_RENA);
734 immap->im_ioport.iop_pcso |= (PC_ENET_CLSN | PC_ENET_RENA);
736 /* Configure Serial Interface clock routing.
737 * First, clear all SCC bits to zero, then set the ones we want.
739 cp->cp_sicr &= ~SICR_ENET_MASK;
740 cp->cp_sicr |= SICR_ENET_CLKRT;
742 /* Manual says set SDDR, but I can't find anything with that
743 * name. I think it is a misprint, and should be SDCR. This
744 * has already been set by the communication processor initialization.
747 /* Allocate space for the buffer descriptors in the DP ram.
748 * These are relative offsets in the DP ram address space.
749 * Initialize base addresses for the buffer descriptors.
751 dp_offset = cpm_dpalloc(sizeof(cbd_t) * RX_RING_SIZE, 8);
752 ep->sen_genscc.scc_rbase = dp_offset;
753 cep->rx_bd_base = cpm_dpram_addr(dp_offset);
755 dp_offset = cpm_dpalloc(sizeof(cbd_t) * TX_RING_SIZE, 8);
756 ep->sen_genscc.scc_tbase = dp_offset;
757 cep->tx_bd_base = cpm_dpram_addr(dp_offset);
759 cep->dirty_tx = cep->cur_tx = cep->tx_bd_base;
760 cep->cur_rx = cep->rx_bd_base;
762 /* Issue init Rx BD command for SCC.
763 * Manual says to perform an Init Rx parameters here. We have
764 * to perform both Rx and Tx because the SCC may have been
766 * In addition, we have to do it later because we don't yet have
767 * all of the BD control/status set properly.
768 cp->cp_cpcr = mk_cr_cmd(CPM_CR_ENET, CPM_CR_INIT_RX) | CPM_CR_FLG;
769 while (cp->cp_cpcr & CPM_CR_FLG);
772 /* Initialize function code registers for big-endian.
774 ep->sen_genscc.scc_rfcr = SCC_EB;
775 ep->sen_genscc.scc_tfcr = SCC_EB;
777 /* Set maximum bytes per receive buffer.
778 * This appears to be an Ethernet frame size, not the buffer
779 * fragment size. It must be a multiple of four.
781 ep->sen_genscc.scc_mrblr = PKT_MAXBLR_SIZE;
783 /* Set CRC preset and mask.
785 ep->sen_cpres = 0xffffffff;
786 ep->sen_cmask = 0xdebb20e3;
788 ep->sen_crcec = 0; /* CRC Error counter */
789 ep->sen_alec = 0; /* alignment error counter */
790 ep->sen_disfc = 0; /* discard frame counter */
792 ep->sen_pads = 0x8888; /* Tx short frame pad character */
793 ep->sen_retlim = 15; /* Retry limit threshold */
795 ep->sen_maxflr = PKT_MAXBUF_SIZE; /* maximum frame length register */
796 ep->sen_minflr = PKT_MINBUF_SIZE; /* minimum frame length register */
798 ep->sen_maxd1 = PKT_MAXBLR_SIZE; /* maximum DMA1 length */
799 ep->sen_maxd2 = PKT_MAXBLR_SIZE; /* maximum DMA2 length */
801 /* Clear hash tables.
812 /* Set Ethernet station address.
814 eap = (unsigned char *)&(ep->sen_paddrh);
816 *eap++ = dev->dev_addr[i] = bd->bi_enetaddr[i];
818 ep->sen_pper = 0; /* 'cause the book says so */
819 ep->sen_taddrl = 0; /* temp address (LSB) */
821 ep->sen_taddrh = 0; /* temp address (MSB) */
823 /* Now allocate the host memory pages and initialize the
824 * buffer descriptors.
826 bdp = cep->tx_bd_base;
827 for (i=0; i<TX_RING_SIZE; i++) {
829 /* Initialize the BD for every fragment in the page.
832 bdp->cbd_bufaddr = 0;
836 /* Set the last buffer to wrap.
839 bdp->cbd_sc |= BD_SC_WRAP;
841 bdp = cep->rx_bd_base;
843 for (i=0; i<CPM_ENET_RX_PAGES; i++) {
847 ba = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE,
848 &mem_addr, GFP_KERNEL);
849 /* BUG: no check for failure */
851 /* Initialize the BD for every fragment in the page.
853 for (j=0; j<CPM_ENET_RX_FRPPG; j++) {
854 bdp->cbd_sc = BD_ENET_RX_EMPTY | BD_ENET_RX_INTR;
855 bdp->cbd_bufaddr = mem_addr;
856 cep->rx_vaddr[k++] = ba;
857 mem_addr += CPM_ENET_RX_FRSIZE;
858 ba += CPM_ENET_RX_FRSIZE;
863 /* Set the last buffer to wrap.
866 bdp->cbd_sc |= BD_SC_WRAP;
868 /* Let's re-initialize the channel now. We have to do it later
869 * than the manual describes because we have just now finished
870 * the BD initialization.
872 cp->cp_cpcr = mk_cr_cmd(CPM_CR_ENET, CPM_CR_INIT_TRX) | CPM_CR_FLG;
873 while (cp->cp_cpcr & CPM_CR_FLG);
875 cep->skb_cur = cep->skb_dirty = 0;
877 sccp->scc_scce = 0xffff; /* Clear any pending events */
879 /* Enable interrupts for transmit error, complete frame
880 * received, and any transmit buffer we have also set the
883 sccp->scc_sccm = (SCCE_ENET_TXE | SCCE_ENET_RXF | SCCE_ENET_TXB);
885 /* Install our interrupt handler.
887 cpm_install_handler(CPMVEC_ENET, scc_enet_interrupt, dev);
889 /* Set GSMR_H to enable all normal operating modes.
890 * Set GSMR_L to enable Ethernet to MC68160.
893 sccp->scc_gsmrl = (SCC_GSMRL_TCI | SCC_GSMRL_TPL_48 | SCC_GSMRL_TPP_10 | SCC_GSMRL_MODE_ENET);
895 /* Set sync/delimiters.
897 sccp->scc_dsr = 0xd555;
899 /* Set processing mode. Use Ethernet CRC, catch broadcast, and
900 * start frame search 22 bit times after RENA.
902 sccp->scc_psmr = (SCC_PSMR_ENCRC | SCC_PSMR_NIB22);
904 /* It is now OK to enable the Ethernet transmitter.
905 * Unfortunately, there are board implementation differences here.
907 #if (!defined (PB_ENET_TENA) && defined (PC_ENET_TENA) && !defined (PE_ENET_TENA))
908 immap->im_ioport.iop_pcpar |= PC_ENET_TENA;
909 immap->im_ioport.iop_pcdir &= ~PC_ENET_TENA;
910 #elif ( defined (PB_ENET_TENA) && !defined (PC_ENET_TENA) && !defined (PE_ENET_TENA))
911 cp->cp_pbpar |= PB_ENET_TENA;
912 cp->cp_pbdir |= PB_ENET_TENA;
913 #elif ( !defined (PB_ENET_TENA) && !defined (PC_ENET_TENA) && defined (PE_ENET_TENA))
914 cp->cp_pepar |= PE_ENET_TENA;
915 cp->cp_pedir &= ~PE_ENET_TENA;
916 cp->cp_peso |= PE_ENET_TENA;
918 #error Configuration Error: define exactly ONE of PB_ENET_TENA, PC_ENET_TENA, PE_ENET_TENA
921 #if defined(CONFIG_RPXLITE) || defined(CONFIG_RPXCLASSIC)
922 /* And while we are here, set the configuration to enable ethernet.
924 *((volatile uint *)RPX_CSR_ADDR) &= ~BCSR0_ETHLPBK;
925 *((volatile uint *)RPX_CSR_ADDR) |=
926 (BCSR0_ETHEN | BCSR0_COLTESTDIS | BCSR0_FULLDPLXDIS);
930 /* BSE uses port B and C for PHY control.
932 cp->cp_pbpar &= ~(PB_BSE_POWERUP | PB_BSE_FDXDIS);
933 cp->cp_pbdir |= (PB_BSE_POWERUP | PB_BSE_FDXDIS);
934 cp->cp_pbdat |= (PB_BSE_POWERUP | PB_BSE_FDXDIS);
936 immap->im_ioport.iop_pcpar &= ~PC_BSE_LOOPBACK;
937 immap->im_ioport.iop_pcdir |= PC_BSE_LOOPBACK;
938 immap->im_ioport.iop_pcso &= ~PC_BSE_LOOPBACK;
939 immap->im_ioport.iop_pcdat &= ~PC_BSE_LOOPBACK;
943 cp->cp_pbpar |= PB_ENET_TENA;
944 cp->cp_pbdir |= PB_ENET_TENA;
946 /* Enable the EEST PHY.
948 *((volatile uint *)BCSR1) &= ~BCSR1_ETHEN;
951 #ifdef CONFIG_MPC885ADS
953 /* Deassert PHY reset and enable the PHY.
956 volatile uint __iomem *bcsr = ioremap(BCSR_ADDR, BCSR_SIZE);
959 tmp = in_be32(bcsr + 1 /* BCSR1 */);
961 out_be32(bcsr + 1, tmp);
962 tmp = in_be32(bcsr + 4 /* BCSR4 */);
963 tmp |= BCSR4_ETH10_RST;
964 out_be32(bcsr + 4, tmp);
968 /* On MPC885ADS SCC ethernet PHY defaults to the full duplex mode
969 * upon reset. SCC is set to half duplex by default. So this
970 * inconsistency should be better fixed by the software.
974 dev->base_addr = (unsigned long)ep;
976 dev->name = "CPM_ENET";
979 /* The CPM Ethernet specific entries in the device structure. */
980 dev->open = scc_enet_open;
981 dev->hard_start_xmit = scc_enet_start_xmit;
982 dev->tx_timeout = scc_enet_timeout;
983 dev->watchdog_timeo = TX_TIMEOUT;
984 dev->stop = scc_enet_close;
985 dev->get_stats = scc_enet_get_stats;
986 dev->set_multicast_list = set_multicast_list;
988 err = register_netdev(dev);
994 /* And last, enable the transmit and receive processing.
996 sccp->scc_gsmrl |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);
998 printk("%s: CPM ENET Version 0.2 on SCC%d, ", dev->name, SCC_ENET+1);
1000 printk("%02x:", dev->dev_addr[i]);
1001 printk("%02x\n", dev->dev_addr[5]);
1006 module_init(scc_enet_init);