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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * sgiseeq.c: Seeq8003 ethernet driver for SGI machines.4 *5 * Copyright (C) 1996 David S. Miller (davem@davemloft.net)6 */7 8#undef DEBUG9 10#include <linux/dma-mapping.h>11#include <linux/kernel.h>12#include <linux/module.h>13#include <linux/slab.h>14#include <linux/errno.h>15#include <linux/types.h>16#include <linux/interrupt.h>17#include <linux/string.h>18#include <linux/delay.h>19#include <linux/netdevice.h>20#include <linux/platform_device.h>21#include <linux/etherdevice.h>22#include <linux/skbuff.h>23 24#include <asm/sgi/hpc3.h>25#include <asm/sgi/ip22.h>26#include <asm/sgi/seeq.h>27 28#include "sgiseeq.h"29 30static char *sgiseeqstr = "SGI Seeq8003";31 32/*33 * If you want speed, you do something silly, it always has worked for me. So,34 * with that in mind, I've decided to make this driver look completely like a35 * stupid Lance from a driver architecture perspective. Only difference is that36 * here our "ring buffer" looks and acts like a real Lance one does but is37 * laid out like how the HPC DMA and the Seeq want it to. You'd be surprised38 * how a stupid idea like this can pay off in performance, not to mention39 * making this driver 2,000 times easier to write. ;-)40 */41 42/* Tune these if we tend to run out often etc. */43#define SEEQ_RX_BUFFERS 1644#define SEEQ_TX_BUFFERS 1645 46#define PKT_BUF_SZ 158447 48#define NEXT_RX(i) (((i) + 1) & (SEEQ_RX_BUFFERS - 1))49#define NEXT_TX(i) (((i) + 1) & (SEEQ_TX_BUFFERS - 1))50#define PREV_RX(i) (((i) - 1) & (SEEQ_RX_BUFFERS - 1))51#define PREV_TX(i) (((i) - 1) & (SEEQ_TX_BUFFERS - 1))52 53#define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ? \54 sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \55 sp->tx_old - sp->tx_new - 1)56 57#define VIRT_TO_DMA(sp, v) ((sp)->srings_dma + \58 (dma_addr_t)((unsigned long)(v) - \59 (unsigned long)((sp)->rx_desc)))60 61/* Copy frames shorter than rx_copybreak, otherwise pass on up in62 * a full sized sk_buff. Value of 100 stolen from tulip.c (!alpha).63 */64static int rx_copybreak = 100;65 66#define PAD_SIZE (128 - sizeof(struct hpc_dma_desc) - sizeof(void *))67 68struct sgiseeq_rx_desc {69 volatile struct hpc_dma_desc rdma;70 u8 padding[PAD_SIZE];71 struct sk_buff *skb;72};73 74struct sgiseeq_tx_desc {75 volatile struct hpc_dma_desc tdma;76 u8 padding[PAD_SIZE];77 struct sk_buff *skb;78};79 80/*81 * Warning: This structure is laid out in a certain way because HPC dma82 * descriptors must be 8-byte aligned. So don't touch this without83 * some care.84 */85struct sgiseeq_init_block { /* Note the name ;-) */86 struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS];87 struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS];88};89 90struct sgiseeq_private {91 struct sgiseeq_init_block *srings;92 dma_addr_t srings_dma;93 94 /* Ptrs to the descriptors in uncached space. */95 struct sgiseeq_rx_desc *rx_desc;96 struct sgiseeq_tx_desc *tx_desc;97 98 char *name;99 struct hpc3_ethregs *hregs;100 struct sgiseeq_regs *sregs;101 102 /* Ring entry counters. */103 unsigned int rx_new, tx_new;104 unsigned int rx_old, tx_old;105 106 int is_edlc;107 unsigned char control;108 unsigned char mode;109 110 spinlock_t tx_lock;111};112 113static inline void dma_sync_desc_cpu(struct net_device *dev, void *addr)114{115 struct sgiseeq_private *sp = netdev_priv(dev);116 117 dma_sync_single_for_cpu(dev->dev.parent, VIRT_TO_DMA(sp, addr),118 sizeof(struct sgiseeq_rx_desc), DMA_BIDIRECTIONAL);119}120 121static inline void dma_sync_desc_dev(struct net_device *dev, void *addr)122{123 struct sgiseeq_private *sp = netdev_priv(dev);124 125 dma_sync_single_for_device(dev->dev.parent, VIRT_TO_DMA(sp, addr),126 sizeof(struct sgiseeq_rx_desc), DMA_BIDIRECTIONAL);127}128 129static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs)130{131 hregs->reset = HPC3_ERST_CRESET | HPC3_ERST_CLRIRQ;132 udelay(20);133 hregs->reset = 0;134}135 136static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs,137 struct sgiseeq_regs *sregs)138{139 hregs->rx_ctrl = hregs->tx_ctrl = 0;140 hpc3_eth_reset(hregs);141}142 143#define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \144 SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC)145 146static inline void seeq_go(struct sgiseeq_private *sp,147 struct hpc3_ethregs *hregs,148 struct sgiseeq_regs *sregs)149{150 sregs->rstat = sp->mode | RSTAT_GO_BITS;151 hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE;152}153 154static inline void __sgiseeq_set_mac_address(struct net_device *dev)155{156 struct sgiseeq_private *sp = netdev_priv(dev);157 struct sgiseeq_regs *sregs = sp->sregs;158 int i;159 160 sregs->tstat = SEEQ_TCMD_RB0;161 for (i = 0; i < 6; i++)162 sregs->rw.eth_addr[i] = dev->dev_addr[i];163}164 165static int sgiseeq_set_mac_address(struct net_device *dev, void *addr)166{167 struct sgiseeq_private *sp = netdev_priv(dev);168 struct sockaddr *sa = addr;169 170 eth_hw_addr_set(dev, sa->sa_data);171 172 spin_lock_irq(&sp->tx_lock);173 __sgiseeq_set_mac_address(dev);174 spin_unlock_irq(&sp->tx_lock);175 176 return 0;177}178 179#define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD)180#define RCNTCFG_INIT (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE)181#define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT))182 183static int seeq_init_ring(struct net_device *dev)184{185 struct sgiseeq_private *sp = netdev_priv(dev);186 int i;187 188 netif_stop_queue(dev);189 sp->rx_new = sp->tx_new = 0;190 sp->rx_old = sp->tx_old = 0;191 192 __sgiseeq_set_mac_address(dev);193 194 /* Setup tx ring. */195 for(i = 0; i < SEEQ_TX_BUFFERS; i++) {196 sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT;197 dma_sync_desc_dev(dev, &sp->tx_desc[i]);198 }199 200 /* And now the rx ring. */201 for (i = 0; i < SEEQ_RX_BUFFERS; i++) {202 if (!sp->rx_desc[i].skb) {203 dma_addr_t dma_addr;204 struct sk_buff *skb = netdev_alloc_skb(dev, PKT_BUF_SZ);205 206 if (skb == NULL)207 return -ENOMEM;208 skb_reserve(skb, 2);209 dma_addr = dma_map_single(dev->dev.parent,210 skb->data - 2,211 PKT_BUF_SZ, DMA_FROM_DEVICE);212 sp->rx_desc[i].skb = skb;213 sp->rx_desc[i].rdma.pbuf = dma_addr;214 }215 sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT;216 dma_sync_desc_dev(dev, &sp->rx_desc[i]);217 }218 sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR;219 dma_sync_desc_dev(dev, &sp->rx_desc[i - 1]);220 return 0;221}222 223static void seeq_purge_ring(struct net_device *dev)224{225 struct sgiseeq_private *sp = netdev_priv(dev);226 int i;227 228 /* clear tx ring. */229 for (i = 0; i < SEEQ_TX_BUFFERS; i++) {230 if (sp->tx_desc[i].skb) {231 dev_kfree_skb(sp->tx_desc[i].skb);232 sp->tx_desc[i].skb = NULL;233 }234 }235 236 /* And now the rx ring. */237 for (i = 0; i < SEEQ_RX_BUFFERS; i++) {238 if (sp->rx_desc[i].skb) {239 dev_kfree_skb(sp->rx_desc[i].skb);240 sp->rx_desc[i].skb = NULL;241 }242 }243}244 245#ifdef DEBUG246static struct sgiseeq_private *gpriv;247static struct net_device *gdev;248 249static void sgiseeq_dump_rings(void)250{251 static int once;252 struct sgiseeq_rx_desc *r = gpriv->rx_desc;253 struct sgiseeq_tx_desc *t = gpriv->tx_desc;254 struct hpc3_ethregs *hregs = gpriv->hregs;255 int i;256 257 if (once)258 return;259 once++;260 printk("RING DUMP:\n");261 for (i = 0; i < SEEQ_RX_BUFFERS; i++) {262 printk("RX [%d]: @(%p) [%08x,%08x,%08x] ",263 i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,264 r[i].rdma.pnext);265 i += 1;266 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",267 i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,268 r[i].rdma.pnext);269 }270 for (i = 0; i < SEEQ_TX_BUFFERS; i++) {271 printk("TX [%d]: @(%p) [%08x,%08x,%08x] ",272 i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,273 t[i].tdma.pnext);274 i += 1;275 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",276 i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,277 t[i].tdma.pnext);278 }279 printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n",280 gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old);281 printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n",282 hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl);283 printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n",284 hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl);285}286#endif287 288#define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF)289#define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2)290 291static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp,292 struct sgiseeq_regs *sregs)293{294 struct hpc3_ethregs *hregs = sp->hregs;295 int err;296 297 reset_hpc3_and_seeq(hregs, sregs);298 err = seeq_init_ring(dev);299 if (err)300 return err;301 302 /* Setup to field the proper interrupt types. */303 if (sp->is_edlc) {304 sregs->tstat = TSTAT_INIT_EDLC;305 sregs->rw.wregs.control = sp->control;306 sregs->rw.wregs.frame_gap = 0;307 } else {308 sregs->tstat = TSTAT_INIT_SEEQ;309 }310 311 hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc);312 hregs->tx_ndptr = VIRT_TO_DMA(sp, sp->tx_desc);313 314 seeq_go(sp, hregs, sregs);315 return 0;316}317 318static void record_rx_errors(struct net_device *dev, unsigned char status)319{320 if (status & SEEQ_RSTAT_OVERF ||321 status & SEEQ_RSTAT_SFRAME)322 dev->stats.rx_over_errors++;323 if (status & SEEQ_RSTAT_CERROR)324 dev->stats.rx_crc_errors++;325 if (status & SEEQ_RSTAT_DERROR)326 dev->stats.rx_frame_errors++;327 if (status & SEEQ_RSTAT_REOF)328 dev->stats.rx_errors++;329}330 331static inline void rx_maybe_restart(struct sgiseeq_private *sp,332 struct hpc3_ethregs *hregs,333 struct sgiseeq_regs *sregs)334{335 if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) {336 hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc + sp->rx_new);337 seeq_go(sp, hregs, sregs);338 }339}340 341static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp,342 struct hpc3_ethregs *hregs,343 struct sgiseeq_regs *sregs)344{345 struct sgiseeq_rx_desc *rd;346 struct sk_buff *skb = NULL;347 struct sk_buff *newskb;348 unsigned char pkt_status;349 int len = 0;350 unsigned int orig_end = PREV_RX(sp->rx_new);351 352 /* Service every received packet. */353 rd = &sp->rx_desc[sp->rx_new];354 dma_sync_desc_cpu(dev, rd);355 while (!(rd->rdma.cntinfo & HPCDMA_OWN)) {356 len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3;357 dma_unmap_single(dev->dev.parent, rd->rdma.pbuf,358 PKT_BUF_SZ, DMA_FROM_DEVICE);359 pkt_status = rd->skb->data[len];360 if (pkt_status & SEEQ_RSTAT_FIG) {361 /* Packet is OK. */362 /* We don't want to receive our own packets */363 if (!ether_addr_equal(rd->skb->data + 6, dev->dev_addr)) {364 if (len > rx_copybreak) {365 skb = rd->skb;366 newskb = netdev_alloc_skb(dev, PKT_BUF_SZ);367 if (!newskb) {368 newskb = skb;369 skb = NULL;370 goto memory_squeeze;371 }372 skb_reserve(newskb, 2);373 } else {374 skb = netdev_alloc_skb_ip_align(dev, len);375 if (skb)376 skb_copy_to_linear_data(skb, rd->skb->data, len);377 378 newskb = rd->skb;379 }380memory_squeeze:381 if (skb) {382 skb_put(skb, len);383 skb->protocol = eth_type_trans(skb, dev);384 netif_rx(skb);385 dev->stats.rx_packets++;386 dev->stats.rx_bytes += len;387 } else {388 dev->stats.rx_dropped++;389 }390 } else {391 /* Silently drop my own packets */392 newskb = rd->skb;393 }394 } else {395 record_rx_errors(dev, pkt_status);396 newskb = rd->skb;397 }398 rd->skb = newskb;399 rd->rdma.pbuf = dma_map_single(dev->dev.parent,400 newskb->data - 2,401 PKT_BUF_SZ, DMA_FROM_DEVICE);402 403 /* Return the entry to the ring pool. */404 rd->rdma.cntinfo = RCNTINFO_INIT;405 sp->rx_new = NEXT_RX(sp->rx_new);406 dma_sync_desc_dev(dev, rd);407 rd = &sp->rx_desc[sp->rx_new];408 dma_sync_desc_cpu(dev, rd);409 }410 dma_sync_desc_dev(dev, rd);411 412 dma_sync_desc_cpu(dev, &sp->rx_desc[orig_end]);413 sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR);414 dma_sync_desc_dev(dev, &sp->rx_desc[orig_end]);415 dma_sync_desc_cpu(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]);416 sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR;417 dma_sync_desc_dev(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]);418 rx_maybe_restart(sp, hregs, sregs);419}420 421static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp,422 struct sgiseeq_regs *sregs)423{424 if (sp->is_edlc) {425 sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT);426 sregs->rw.wregs.control = sp->control;427 }428}429 430static inline void kick_tx(struct net_device *dev,431 struct sgiseeq_private *sp,432 struct hpc3_ethregs *hregs)433{434 struct sgiseeq_tx_desc *td;435 int i = sp->tx_old;436 437 /* If the HPC aint doin nothin, and there are more packets438 * with ETXD cleared and XIU set we must make very certain439 * that we restart the HPC else we risk locking up the440 * adapter. The following code is only safe iff the HPCDMA441 * is not active!442 */443 td = &sp->tx_desc[i];444 dma_sync_desc_cpu(dev, td);445 while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) ==446 (HPCDMA_XIU | HPCDMA_ETXD)) {447 i = NEXT_TX(i);448 td = &sp->tx_desc[i];449 dma_sync_desc_cpu(dev, td);450 }451 if (td->tdma.cntinfo & HPCDMA_XIU) {452 dma_sync_desc_dev(dev, td);453 hregs->tx_ndptr = VIRT_TO_DMA(sp, td);454 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;455 }456}457 458static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp,459 struct hpc3_ethregs *hregs,460 struct sgiseeq_regs *sregs)461{462 struct sgiseeq_tx_desc *td;463 unsigned long status = hregs->tx_ctrl;464 int j;465 466 tx_maybe_reset_collisions(sp, sregs);467 468 if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) {469 /* Oops, HPC detected some sort of error. */470 if (status & SEEQ_TSTAT_R16)471 dev->stats.tx_aborted_errors++;472 if (status & SEEQ_TSTAT_UFLOW)473 dev->stats.tx_fifo_errors++;474 if (status & SEEQ_TSTAT_LCLS)475 dev->stats.collisions++;476 }477 478 /* Ack 'em... */479 for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) {480 td = &sp->tx_desc[j];481 482 dma_sync_desc_cpu(dev, td);483 if (!(td->tdma.cntinfo & (HPCDMA_XIU)))484 break;485 if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) {486 dma_sync_desc_dev(dev, td);487 if (!(status & HPC3_ETXCTRL_ACTIVE)) {488 hregs->tx_ndptr = VIRT_TO_DMA(sp, td);489 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;490 }491 break;492 }493 dev->stats.tx_packets++;494 sp->tx_old = NEXT_TX(sp->tx_old);495 td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE);496 td->tdma.cntinfo |= HPCDMA_EOX;497 if (td->skb) {498 dev_kfree_skb_any(td->skb);499 td->skb = NULL;500 }501 dma_sync_desc_dev(dev, td);502 }503}504 505static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id)506{507 struct net_device *dev = (struct net_device *) dev_id;508 struct sgiseeq_private *sp = netdev_priv(dev);509 struct hpc3_ethregs *hregs = sp->hregs;510 struct sgiseeq_regs *sregs = sp->sregs;511 512 spin_lock(&sp->tx_lock);513 514 /* Ack the IRQ and set software state. */515 hregs->reset = HPC3_ERST_CLRIRQ;516 517 /* Always check for received packets. */518 sgiseeq_rx(dev, sp, hregs, sregs);519 520 /* Only check for tx acks if we have something queued. */521 if (sp->tx_old != sp->tx_new)522 sgiseeq_tx(dev, sp, hregs, sregs);523 524 if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) {525 netif_wake_queue(dev);526 }527 spin_unlock(&sp->tx_lock);528 529 return IRQ_HANDLED;530}531 532static int sgiseeq_open(struct net_device *dev)533{534 struct sgiseeq_private *sp = netdev_priv(dev);535 struct sgiseeq_regs *sregs = sp->sregs;536 unsigned int irq = dev->irq;537 int err;538 539 if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) {540 printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq);541 return -EAGAIN;542 }543 544 err = init_seeq(dev, sp, sregs);545 if (err)546 goto out_free_irq;547 548 netif_start_queue(dev);549 550 return 0;551 552out_free_irq:553 free_irq(irq, dev);554 555 return err;556}557 558static int sgiseeq_close(struct net_device *dev)559{560 struct sgiseeq_private *sp = netdev_priv(dev);561 struct sgiseeq_regs *sregs = sp->sregs;562 unsigned int irq = dev->irq;563 564 netif_stop_queue(dev);565 566 /* Shutdown the Seeq. */567 reset_hpc3_and_seeq(sp->hregs, sregs);568 free_irq(irq, dev);569 seeq_purge_ring(dev);570 571 return 0;572}573 574static inline int sgiseeq_reset(struct net_device *dev)575{576 struct sgiseeq_private *sp = netdev_priv(dev);577 struct sgiseeq_regs *sregs = sp->sregs;578 int err;579 580 err = init_seeq(dev, sp, sregs);581 if (err)582 return err;583 584 netif_trans_update(dev); /* prevent tx timeout */585 netif_wake_queue(dev);586 587 return 0;588}589 590static netdev_tx_t591sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev)592{593 struct sgiseeq_private *sp = netdev_priv(dev);594 struct hpc3_ethregs *hregs = sp->hregs;595 unsigned long flags;596 struct sgiseeq_tx_desc *td;597 int len, entry;598 599 spin_lock_irqsave(&sp->tx_lock, flags);600 601 /* Setup... */602 len = skb->len;603 if (len < ETH_ZLEN) {604 if (skb_padto(skb, ETH_ZLEN)) {605 spin_unlock_irqrestore(&sp->tx_lock, flags);606 return NETDEV_TX_OK;607 }608 len = ETH_ZLEN;609 }610 611 dev->stats.tx_bytes += len;612 entry = sp->tx_new;613 td = &sp->tx_desc[entry];614 dma_sync_desc_cpu(dev, td);615 616 /* Create entry. There are so many races with adding a new617 * descriptor to the chain:618 * 1) Assume that the HPC is off processing a DMA chain while619 * we are changing all of the following.620 * 2) Do no allow the HPC to look at a new descriptor until621 * we have completely set up it's state. This means, do622 * not clear HPCDMA_EOX in the current last descritptor623 * until the one we are adding looks consistent and could624 * be processes right now.625 * 3) The tx interrupt code must notice when we've added a new626 * entry and the HPC got to the end of the chain before we627 * added this new entry and restarted it.628 */629 td->skb = skb;630 td->tdma.pbuf = dma_map_single(dev->dev.parent, skb->data,631 len, DMA_TO_DEVICE);632 td->tdma.cntinfo = (len & HPCDMA_BCNT) |633 HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX;634 dma_sync_desc_dev(dev, td);635 if (sp->tx_old != sp->tx_new) {636 struct sgiseeq_tx_desc *backend;637 638 backend = &sp->tx_desc[PREV_TX(sp->tx_new)];639 dma_sync_desc_cpu(dev, backend);640 backend->tdma.cntinfo &= ~HPCDMA_EOX;641 dma_sync_desc_dev(dev, backend);642 }643 sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */644 645 /* Maybe kick the HPC back into motion. */646 if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE))647 kick_tx(dev, sp, hregs);648 649 if (!TX_BUFFS_AVAIL(sp))650 netif_stop_queue(dev);651 spin_unlock_irqrestore(&sp->tx_lock, flags);652 653 return NETDEV_TX_OK;654}655 656static void timeout(struct net_device *dev, unsigned int txqueue)657{658 printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name);659 sgiseeq_reset(dev);660 661 netif_trans_update(dev); /* prevent tx timeout */662 netif_wake_queue(dev);663}664 665static void sgiseeq_set_multicast(struct net_device *dev)666{667 struct sgiseeq_private *sp = netdev_priv(dev);668 unsigned char oldmode = sp->mode;669 670 if(dev->flags & IFF_PROMISC)671 sp->mode = SEEQ_RCMD_RANY;672 else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev))673 sp->mode = SEEQ_RCMD_RBMCAST;674 else675 sp->mode = SEEQ_RCMD_RBCAST;676 677 /* XXX I know this sucks, but is there a better way to reprogram678 * XXX the receiver? At least, this shouldn't happen too often.679 */680 681 if (oldmode != sp->mode)682 sgiseeq_reset(dev);683}684 685static inline void setup_tx_ring(struct net_device *dev,686 struct sgiseeq_tx_desc *buf,687 int nbufs)688{689 struct sgiseeq_private *sp = netdev_priv(dev);690 int i = 0;691 692 while (i < (nbufs - 1)) {693 buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf + i + 1);694 buf[i].tdma.pbuf = 0;695 dma_sync_desc_dev(dev, &buf[i]);696 i++;697 }698 buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf);699 dma_sync_desc_dev(dev, &buf[i]);700}701 702static inline void setup_rx_ring(struct net_device *dev,703 struct sgiseeq_rx_desc *buf,704 int nbufs)705{706 struct sgiseeq_private *sp = netdev_priv(dev);707 int i = 0;708 709 while (i < (nbufs - 1)) {710 buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf + i + 1);711 buf[i].rdma.pbuf = 0;712 dma_sync_desc_dev(dev, &buf[i]);713 i++;714 }715 buf[i].rdma.pbuf = 0;716 buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf);717 dma_sync_desc_dev(dev, &buf[i]);718}719 720static const struct net_device_ops sgiseeq_netdev_ops = {721 .ndo_open = sgiseeq_open,722 .ndo_stop = sgiseeq_close,723 .ndo_start_xmit = sgiseeq_start_xmit,724 .ndo_tx_timeout = timeout,725 .ndo_set_rx_mode = sgiseeq_set_multicast,726 .ndo_set_mac_address = sgiseeq_set_mac_address,727 .ndo_validate_addr = eth_validate_addr,728};729 730static int sgiseeq_probe(struct platform_device *pdev)731{732 struct sgiseeq_platform_data *pd = dev_get_platdata(&pdev->dev);733 struct hpc3_regs *hpcregs = pd->hpc;734 struct sgiseeq_init_block *sr;735 unsigned int irq = pd->irq;736 struct sgiseeq_private *sp;737 struct net_device *dev;738 int err;739 740 dev = alloc_etherdev(sizeof (struct sgiseeq_private));741 if (!dev) {742 err = -ENOMEM;743 goto err_out;744 }745 746 platform_set_drvdata(pdev, dev);747 SET_NETDEV_DEV(dev, &pdev->dev);748 sp = netdev_priv(dev);749 750 /* Make private data page aligned */751 sr = dma_alloc_noncoherent(&pdev->dev, sizeof(*sp->srings),752 &sp->srings_dma, DMA_BIDIRECTIONAL, GFP_KERNEL);753 if (!sr) {754 printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n");755 err = -ENOMEM;756 goto err_out_free_dev;757 }758 sp->srings = sr;759 sp->rx_desc = sp->srings->rxvector;760 sp->tx_desc = sp->srings->txvector;761 spin_lock_init(&sp->tx_lock);762 763 /* A couple calculations now, saves many cycles later. */764 setup_rx_ring(dev, sp->rx_desc, SEEQ_RX_BUFFERS);765 setup_tx_ring(dev, sp->tx_desc, SEEQ_TX_BUFFERS);766 767 eth_hw_addr_set(dev, pd->mac);768 769#ifdef DEBUG770 gpriv = sp;771 gdev = dev;772#endif773 sp->sregs = (struct sgiseeq_regs *) &hpcregs->eth_ext[0];774 sp->hregs = &hpcregs->ethregs;775 sp->name = sgiseeqstr;776 sp->mode = SEEQ_RCMD_RBCAST;777 778 /* Setup PIO and DMA transfer timing */779 sp->hregs->pconfig = 0x161;780 sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP |781 HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026;782 783 /* Setup PIO and DMA transfer timing */784 sp->hregs->pconfig = 0x161;785 sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP |786 HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026;787 788 /* Reset the chip. */789 hpc3_eth_reset(sp->hregs);790 791 sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff);792 if (sp->is_edlc)793 sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT |794 SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT |795 SEEQ_CTRL_ENCARR;796 797 dev->netdev_ops = &sgiseeq_netdev_ops;798 dev->watchdog_timeo = (200 * HZ) / 1000;799 dev->irq = irq;800 801 if (register_netdev(dev)) {802 printk(KERN_ERR "Sgiseeq: Cannot register net device, "803 "aborting.\n");804 err = -ENODEV;805 goto err_out_free_attrs;806 }807 808 printk(KERN_INFO "%s: %s %pM\n", dev->name, sgiseeqstr, dev->dev_addr);809 810 return 0;811 812err_out_free_attrs:813 dma_free_noncoherent(&pdev->dev, sizeof(*sp->srings), sp->srings,814 sp->srings_dma, DMA_BIDIRECTIONAL);815err_out_free_dev:816 free_netdev(dev);817 818err_out:819 return err;820}821 822static void sgiseeq_remove(struct platform_device *pdev)823{824 struct net_device *dev = platform_get_drvdata(pdev);825 struct sgiseeq_private *sp = netdev_priv(dev);826 827 unregister_netdev(dev);828 dma_free_noncoherent(&pdev->dev, sizeof(*sp->srings), sp->srings,829 sp->srings_dma, DMA_BIDIRECTIONAL);830 free_netdev(dev);831}832 833static struct platform_driver sgiseeq_driver = {834 .probe = sgiseeq_probe,835 .remove_new = sgiseeq_remove,836 .driver = {837 .name = "sgiseeq",838 }839};840 841module_platform_driver(sgiseeq_driver);842 843MODULE_DESCRIPTION("SGI Seeq 8003 driver");844MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>");845MODULE_LICENSE("GPL");846MODULE_ALIAS("platform:sgiseeq");847