Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * sgiseeq.c: Seeq8003 ethernet driver for SGI machines. |
| 3 | * |
| 4 | * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com) |
| 5 | */ |
| 6 | #include <linux/kernel.h> |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/errno.h> |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/types.h> |
| 11 | #include <linux/interrupt.h> |
| 12 | #include <linux/ioport.h> |
| 13 | #include <linux/socket.h> |
| 14 | #include <linux/in.h> |
| 15 | #include <linux/route.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/string.h> |
| 18 | #include <linux/delay.h> |
| 19 | #include <linux/netdevice.h> |
| 20 | #include <linux/etherdevice.h> |
| 21 | #include <linux/skbuff.h> |
| 22 | #include <linux/bitops.h> |
| 23 | |
| 24 | #include <asm/byteorder.h> |
| 25 | #include <asm/io.h> |
| 26 | #include <asm/system.h> |
| 27 | #include <asm/page.h> |
| 28 | #include <asm/pgtable.h> |
| 29 | #include <asm/sgi/hpc3.h> |
| 30 | #include <asm/sgi/ip22.h> |
| 31 | #include <asm/sgialib.h> |
| 32 | |
| 33 | #include "sgiseeq.h" |
| 34 | |
| 35 | static char *version = "sgiseeq.c: David S. Miller (dm@engr.sgi.com)\n"; |
| 36 | |
| 37 | static char *sgiseeqstr = "SGI Seeq8003"; |
| 38 | |
| 39 | /* |
| 40 | * If you want speed, you do something silly, it always has worked for me. So, |
| 41 | * with that in mind, I've decided to make this driver look completely like a |
| 42 | * stupid Lance from a driver architecture perspective. Only difference is that |
| 43 | * here our "ring buffer" looks and acts like a real Lance one does but is |
| 44 | * layed out like how the HPC DMA and the Seeq want it to. You'd be surprised |
| 45 | * how a stupid idea like this can pay off in performance, not to mention |
| 46 | * making this driver 2,000 times easier to write. ;-) |
| 47 | */ |
| 48 | |
| 49 | /* Tune these if we tend to run out often etc. */ |
| 50 | #define SEEQ_RX_BUFFERS 16 |
| 51 | #define SEEQ_TX_BUFFERS 16 |
| 52 | |
| 53 | #define PKT_BUF_SZ 1584 |
| 54 | |
| 55 | #define NEXT_RX(i) (((i) + 1) & (SEEQ_RX_BUFFERS - 1)) |
| 56 | #define NEXT_TX(i) (((i) + 1) & (SEEQ_TX_BUFFERS - 1)) |
| 57 | #define PREV_RX(i) (((i) - 1) & (SEEQ_RX_BUFFERS - 1)) |
| 58 | #define PREV_TX(i) (((i) - 1) & (SEEQ_TX_BUFFERS - 1)) |
| 59 | |
| 60 | #define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ? \ |
| 61 | sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \ |
| 62 | sp->tx_old - sp->tx_new - 1) |
| 63 | |
| 64 | #define DEBUG |
| 65 | |
| 66 | struct sgiseeq_rx_desc { |
| 67 | volatile struct hpc_dma_desc rdma; |
| 68 | volatile signed int buf_vaddr; |
| 69 | }; |
| 70 | |
| 71 | struct sgiseeq_tx_desc { |
| 72 | volatile struct hpc_dma_desc tdma; |
| 73 | volatile signed int buf_vaddr; |
| 74 | }; |
| 75 | |
| 76 | /* |
| 77 | * Warning: This structure is layed out in a certain way because HPC dma |
| 78 | * descriptors must be 8-byte aligned. So don't touch this without |
| 79 | * some care. |
| 80 | */ |
| 81 | struct sgiseeq_init_block { /* Note the name ;-) */ |
| 82 | struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS]; |
| 83 | struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS]; |
| 84 | }; |
| 85 | |
| 86 | struct sgiseeq_private { |
| 87 | struct sgiseeq_init_block *srings; |
| 88 | |
| 89 | /* Ptrs to the descriptors in uncached space. */ |
| 90 | struct sgiseeq_rx_desc *rx_desc; |
| 91 | struct sgiseeq_tx_desc *tx_desc; |
| 92 | |
| 93 | char *name; |
| 94 | struct hpc3_ethregs *hregs; |
| 95 | struct sgiseeq_regs *sregs; |
| 96 | |
| 97 | /* Ring entry counters. */ |
| 98 | unsigned int rx_new, tx_new; |
| 99 | unsigned int rx_old, tx_old; |
| 100 | |
| 101 | int is_edlc; |
| 102 | unsigned char control; |
| 103 | unsigned char mode; |
| 104 | |
| 105 | struct net_device_stats stats; |
| 106 | |
| 107 | struct net_device *next_module; |
| 108 | spinlock_t tx_lock; |
| 109 | }; |
| 110 | |
| 111 | /* A list of all installed seeq devices, for removing the driver module. */ |
| 112 | static struct net_device *root_sgiseeq_dev; |
| 113 | |
| 114 | static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs) |
| 115 | { |
| 116 | hregs->rx_reset = HPC3_ERXRST_CRESET | HPC3_ERXRST_CLRIRQ; |
| 117 | udelay(20); |
| 118 | hregs->rx_reset = 0; |
| 119 | } |
| 120 | |
| 121 | static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs, |
| 122 | struct sgiseeq_regs *sregs) |
| 123 | { |
| 124 | hregs->rx_ctrl = hregs->tx_ctrl = 0; |
| 125 | hpc3_eth_reset(hregs); |
| 126 | } |
| 127 | |
| 128 | #define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \ |
| 129 | SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC) |
| 130 | |
| 131 | static inline void seeq_go(struct sgiseeq_private *sp, |
| 132 | struct hpc3_ethregs *hregs, |
| 133 | struct sgiseeq_regs *sregs) |
| 134 | { |
| 135 | sregs->rstat = sp->mode | RSTAT_GO_BITS; |
| 136 | hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE; |
| 137 | } |
| 138 | |
| 139 | static inline void __sgiseeq_set_mac_address(struct net_device *dev) |
| 140 | { |
| 141 | struct sgiseeq_private *sp = netdev_priv(dev); |
| 142 | struct sgiseeq_regs *sregs = sp->sregs; |
| 143 | int i; |
| 144 | |
| 145 | sregs->tstat = SEEQ_TCMD_RB0; |
| 146 | for (i = 0; i < 6; i++) |
| 147 | sregs->rw.eth_addr[i] = dev->dev_addr[i]; |
| 148 | } |
| 149 | |
| 150 | static int sgiseeq_set_mac_address(struct net_device *dev, void *addr) |
| 151 | { |
| 152 | struct sgiseeq_private *sp = netdev_priv(dev); |
| 153 | struct sockaddr *sa = addr; |
| 154 | |
| 155 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); |
| 156 | |
| 157 | spin_lock_irq(&sp->tx_lock); |
| 158 | __sgiseeq_set_mac_address(dev); |
| 159 | spin_unlock_irq(&sp->tx_lock); |
| 160 | |
| 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | #define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD) |
| 165 | #define RCNTCFG_INIT (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE) |
| 166 | #define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT)) |
| 167 | |
| 168 | static int seeq_init_ring(struct net_device *dev) |
| 169 | { |
| 170 | struct sgiseeq_private *sp = netdev_priv(dev); |
| 171 | int i; |
| 172 | |
| 173 | netif_stop_queue(dev); |
| 174 | sp->rx_new = sp->tx_new = 0; |
| 175 | sp->rx_old = sp->tx_old = 0; |
| 176 | |
| 177 | __sgiseeq_set_mac_address(dev); |
| 178 | |
| 179 | /* Setup tx ring. */ |
| 180 | for(i = 0; i < SEEQ_TX_BUFFERS; i++) { |
| 181 | if (!sp->tx_desc[i].tdma.pbuf) { |
| 182 | unsigned long buffer; |
| 183 | |
| 184 | buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL); |
| 185 | if (!buffer) |
| 186 | return -ENOMEM; |
| 187 | sp->tx_desc[i].buf_vaddr = CKSEG1ADDR(buffer); |
| 188 | sp->tx_desc[i].tdma.pbuf = CPHYSADDR(buffer); |
| 189 | } |
| 190 | sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT; |
| 191 | } |
| 192 | |
| 193 | /* And now the rx ring. */ |
| 194 | for (i = 0; i < SEEQ_RX_BUFFERS; i++) { |
| 195 | if (!sp->rx_desc[i].rdma.pbuf) { |
| 196 | unsigned long buffer; |
| 197 | |
| 198 | buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL); |
| 199 | if (!buffer) |
| 200 | return -ENOMEM; |
| 201 | sp->rx_desc[i].buf_vaddr = CKSEG1ADDR(buffer); |
| 202 | sp->rx_desc[i].rdma.pbuf = CPHYSADDR(buffer); |
| 203 | } |
| 204 | sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT; |
| 205 | } |
| 206 | sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR; |
| 207 | return 0; |
| 208 | } |
| 209 | |
| 210 | #ifdef DEBUG |
| 211 | static struct sgiseeq_private *gpriv; |
| 212 | static struct net_device *gdev; |
| 213 | |
| 214 | void sgiseeq_dump_rings(void) |
| 215 | { |
| 216 | static int once; |
| 217 | struct sgiseeq_rx_desc *r = gpriv->rx_desc; |
| 218 | struct sgiseeq_tx_desc *t = gpriv->tx_desc; |
| 219 | struct hpc3_ethregs *hregs = gpriv->hregs; |
| 220 | int i; |
| 221 | |
| 222 | if (once) |
| 223 | return; |
| 224 | once++; |
| 225 | printk("RING DUMP:\n"); |
| 226 | for (i = 0; i < SEEQ_RX_BUFFERS; i++) { |
| 227 | printk("RX [%d]: @(%p) [%08x,%08x,%08x] ", |
| 228 | i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo, |
| 229 | r[i].rdma.pnext); |
| 230 | i += 1; |
| 231 | printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n", |
| 232 | i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo, |
| 233 | r[i].rdma.pnext); |
| 234 | } |
| 235 | for (i = 0; i < SEEQ_TX_BUFFERS; i++) { |
| 236 | printk("TX [%d]: @(%p) [%08x,%08x,%08x] ", |
| 237 | i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo, |
| 238 | t[i].tdma.pnext); |
| 239 | i += 1; |
| 240 | printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n", |
| 241 | i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo, |
| 242 | t[i].tdma.pnext); |
| 243 | } |
| 244 | printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n", |
| 245 | gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old); |
| 246 | printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n", |
| 247 | hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl); |
| 248 | printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n", |
| 249 | hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl); |
| 250 | } |
| 251 | #endif |
| 252 | |
| 253 | #define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF) |
| 254 | #define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2) |
| 255 | #define RDMACFG_INIT (HPC3_ERXDCFG_FRXDC | HPC3_ERXDCFG_FEOP | HPC3_ERXDCFG_FIRQ) |
| 256 | |
| 257 | static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp, |
| 258 | struct sgiseeq_regs *sregs) |
| 259 | { |
| 260 | struct hpc3_ethregs *hregs = sp->hregs; |
| 261 | int err; |
| 262 | |
| 263 | reset_hpc3_and_seeq(hregs, sregs); |
| 264 | err = seeq_init_ring(dev); |
| 265 | if (err) |
| 266 | return err; |
| 267 | |
| 268 | /* Setup to field the proper interrupt types. */ |
| 269 | if (sp->is_edlc) { |
| 270 | sregs->tstat = TSTAT_INIT_EDLC; |
| 271 | sregs->rw.wregs.control = sp->control; |
| 272 | sregs->rw.wregs.frame_gap = 0; |
| 273 | } else { |
| 274 | sregs->tstat = TSTAT_INIT_SEEQ; |
| 275 | } |
| 276 | |
| 277 | hregs->rx_dconfig |= RDMACFG_INIT; |
| 278 | |
| 279 | hregs->rx_ndptr = CPHYSADDR(sp->rx_desc); |
| 280 | hregs->tx_ndptr = CPHYSADDR(sp->tx_desc); |
| 281 | |
| 282 | seeq_go(sp, hregs, sregs); |
| 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | static inline void record_rx_errors(struct sgiseeq_private *sp, |
| 287 | unsigned char status) |
| 288 | { |
| 289 | if (status & SEEQ_RSTAT_OVERF || |
| 290 | status & SEEQ_RSTAT_SFRAME) |
| 291 | sp->stats.rx_over_errors++; |
| 292 | if (status & SEEQ_RSTAT_CERROR) |
| 293 | sp->stats.rx_crc_errors++; |
| 294 | if (status & SEEQ_RSTAT_DERROR) |
| 295 | sp->stats.rx_frame_errors++; |
| 296 | if (status & SEEQ_RSTAT_REOF) |
| 297 | sp->stats.rx_errors++; |
| 298 | } |
| 299 | |
| 300 | static inline void rx_maybe_restart(struct sgiseeq_private *sp, |
| 301 | struct hpc3_ethregs *hregs, |
| 302 | struct sgiseeq_regs *sregs) |
| 303 | { |
| 304 | if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) { |
| 305 | hregs->rx_ndptr = CPHYSADDR(sp->rx_desc + sp->rx_new); |
| 306 | seeq_go(sp, hregs, sregs); |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | #define for_each_rx(rd, sp) for((rd) = &(sp)->rx_desc[(sp)->rx_new]; \ |
| 311 | !((rd)->rdma.cntinfo & HPCDMA_OWN); \ |
| 312 | (rd) = &(sp)->rx_desc[(sp)->rx_new]) |
| 313 | |
| 314 | static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp, |
| 315 | struct hpc3_ethregs *hregs, |
| 316 | struct sgiseeq_regs *sregs) |
| 317 | { |
| 318 | struct sgiseeq_rx_desc *rd; |
| 319 | struct sk_buff *skb = 0; |
| 320 | unsigned char pkt_status; |
| 321 | unsigned char *pkt_pointer = 0; |
| 322 | int len = 0; |
| 323 | unsigned int orig_end = PREV_RX(sp->rx_new); |
| 324 | |
| 325 | /* Service every received packet. */ |
| 326 | for_each_rx(rd, sp) { |
| 327 | len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3; |
| 328 | pkt_pointer = (unsigned char *)(long)rd->buf_vaddr; |
| 329 | pkt_status = pkt_pointer[len + 2]; |
| 330 | |
| 331 | if (pkt_status & SEEQ_RSTAT_FIG) { |
| 332 | /* Packet is OK. */ |
| 333 | skb = dev_alloc_skb(len + 2); |
| 334 | |
| 335 | if (skb) { |
| 336 | skb->dev = dev; |
| 337 | skb_reserve(skb, 2); |
| 338 | skb_put(skb, len); |
| 339 | |
| 340 | /* Copy out of kseg1 to avoid silly cache flush. */ |
| 341 | eth_copy_and_sum(skb, pkt_pointer + 2, len, 0); |
| 342 | skb->protocol = eth_type_trans(skb, dev); |
| 343 | |
| 344 | /* We don't want to receive our own packets */ |
| 345 | if (memcmp(eth_hdr(skb)->h_source, dev->dev_addr, ETH_ALEN)) { |
| 346 | netif_rx(skb); |
| 347 | dev->last_rx = jiffies; |
| 348 | sp->stats.rx_packets++; |
| 349 | sp->stats.rx_bytes += len; |
| 350 | } else { |
| 351 | /* Silently drop my own packets */ |
| 352 | dev_kfree_skb_irq(skb); |
| 353 | } |
| 354 | } else { |
| 355 | printk (KERN_NOTICE "%s: Memory squeeze, deferring packet.\n", |
| 356 | dev->name); |
| 357 | sp->stats.rx_dropped++; |
| 358 | } |
| 359 | } else { |
| 360 | record_rx_errors(sp, pkt_status); |
| 361 | } |
| 362 | |
| 363 | /* Return the entry to the ring pool. */ |
| 364 | rd->rdma.cntinfo = RCNTINFO_INIT; |
| 365 | sp->rx_new = NEXT_RX(sp->rx_new); |
| 366 | } |
| 367 | sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR); |
| 368 | sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR; |
| 369 | rx_maybe_restart(sp, hregs, sregs); |
| 370 | } |
| 371 | |
| 372 | static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp, |
| 373 | struct sgiseeq_regs *sregs) |
| 374 | { |
| 375 | if (sp->is_edlc) { |
| 376 | sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT); |
| 377 | sregs->rw.wregs.control = sp->control; |
| 378 | } |
| 379 | } |
| 380 | |
| 381 | static inline void kick_tx(struct sgiseeq_tx_desc *td, |
| 382 | struct hpc3_ethregs *hregs) |
| 383 | { |
| 384 | /* If the HPC aint doin nothin, and there are more packets |
| 385 | * with ETXD cleared and XIU set we must make very certain |
| 386 | * that we restart the HPC else we risk locking up the |
| 387 | * adapter. The following code is only safe iff the HPCDMA |
| 388 | * is not active! |
| 389 | */ |
| 390 | while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) == |
| 391 | (HPCDMA_XIU | HPCDMA_ETXD)) |
| 392 | td = (struct sgiseeq_tx_desc *)(long) CKSEG1ADDR(td->tdma.pnext); |
| 393 | if (td->tdma.cntinfo & HPCDMA_XIU) { |
| 394 | hregs->tx_ndptr = CPHYSADDR(td); |
| 395 | hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE; |
| 396 | } |
| 397 | } |
| 398 | |
| 399 | static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp, |
| 400 | struct hpc3_ethregs *hregs, |
| 401 | struct sgiseeq_regs *sregs) |
| 402 | { |
| 403 | struct sgiseeq_tx_desc *td; |
| 404 | unsigned long status = hregs->tx_ctrl; |
| 405 | int j; |
| 406 | |
| 407 | tx_maybe_reset_collisions(sp, sregs); |
| 408 | |
| 409 | if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) { |
| 410 | /* Oops, HPC detected some sort of error. */ |
| 411 | if (status & SEEQ_TSTAT_R16) |
| 412 | sp->stats.tx_aborted_errors++; |
| 413 | if (status & SEEQ_TSTAT_UFLOW) |
| 414 | sp->stats.tx_fifo_errors++; |
| 415 | if (status & SEEQ_TSTAT_LCLS) |
| 416 | sp->stats.collisions++; |
| 417 | } |
| 418 | |
| 419 | /* Ack 'em... */ |
| 420 | for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) { |
| 421 | td = &sp->tx_desc[j]; |
| 422 | |
| 423 | if (!(td->tdma.cntinfo & (HPCDMA_XIU))) |
| 424 | break; |
| 425 | if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) { |
| 426 | if (!(status & HPC3_ETXCTRL_ACTIVE)) { |
| 427 | hregs->tx_ndptr = CPHYSADDR(td); |
| 428 | hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE; |
| 429 | } |
| 430 | break; |
| 431 | } |
| 432 | sp->stats.tx_packets++; |
| 433 | sp->tx_old = NEXT_TX(sp->tx_old); |
| 434 | td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE); |
| 435 | td->tdma.cntinfo |= HPCDMA_EOX; |
| 436 | } |
| 437 | } |
| 438 | |
| 439 | static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id, struct pt_regs *regs) |
| 440 | { |
| 441 | struct net_device *dev = (struct net_device *) dev_id; |
| 442 | struct sgiseeq_private *sp = netdev_priv(dev); |
| 443 | struct hpc3_ethregs *hregs = sp->hregs; |
| 444 | struct sgiseeq_regs *sregs = sp->sregs; |
| 445 | |
| 446 | spin_lock(&sp->tx_lock); |
| 447 | |
| 448 | /* Ack the IRQ and set software state. */ |
| 449 | hregs->rx_reset = HPC3_ERXRST_CLRIRQ; |
| 450 | |
| 451 | /* Always check for received packets. */ |
| 452 | sgiseeq_rx(dev, sp, hregs, sregs); |
| 453 | |
| 454 | /* Only check for tx acks if we have something queued. */ |
| 455 | if (sp->tx_old != sp->tx_new) |
| 456 | sgiseeq_tx(dev, sp, hregs, sregs); |
| 457 | |
| 458 | if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) { |
| 459 | netif_wake_queue(dev); |
| 460 | } |
| 461 | spin_unlock(&sp->tx_lock); |
| 462 | |
| 463 | return IRQ_HANDLED; |
| 464 | } |
| 465 | |
| 466 | static int sgiseeq_open(struct net_device *dev) |
| 467 | { |
| 468 | struct sgiseeq_private *sp = netdev_priv(dev); |
| 469 | struct sgiseeq_regs *sregs = sp->sregs; |
| 470 | unsigned int irq = dev->irq; |
| 471 | int err; |
| 472 | |
| 473 | if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) { |
| 474 | printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq); |
| 475 | err = -EAGAIN; |
| 476 | } |
| 477 | |
| 478 | err = init_seeq(dev, sp, sregs); |
| 479 | if (err) |
| 480 | goto out_free_irq; |
| 481 | |
| 482 | netif_start_queue(dev); |
| 483 | |
| 484 | return 0; |
| 485 | |
| 486 | out_free_irq: |
| 487 | free_irq(irq, dev); |
| 488 | |
| 489 | return err; |
| 490 | } |
| 491 | |
| 492 | static int sgiseeq_close(struct net_device *dev) |
| 493 | { |
| 494 | struct sgiseeq_private *sp = netdev_priv(dev); |
| 495 | struct sgiseeq_regs *sregs = sp->sregs; |
| 496 | |
| 497 | netif_stop_queue(dev); |
| 498 | |
| 499 | /* Shutdown the Seeq. */ |
| 500 | reset_hpc3_and_seeq(sp->hregs, sregs); |
| 501 | |
| 502 | return 0; |
| 503 | } |
| 504 | |
| 505 | static inline int sgiseeq_reset(struct net_device *dev) |
| 506 | { |
| 507 | struct sgiseeq_private *sp = netdev_priv(dev); |
| 508 | struct sgiseeq_regs *sregs = sp->sregs; |
| 509 | int err; |
| 510 | |
| 511 | err = init_seeq(dev, sp, sregs); |
| 512 | if (err) |
| 513 | return err; |
| 514 | |
| 515 | dev->trans_start = jiffies; |
| 516 | netif_wake_queue(dev); |
| 517 | |
| 518 | return 0; |
| 519 | } |
| 520 | |
| 521 | void sgiseeq_my_reset(void) |
| 522 | { |
| 523 | printk("RESET!\n"); |
| 524 | sgiseeq_reset(gdev); |
| 525 | } |
| 526 | |
| 527 | static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev) |
| 528 | { |
| 529 | struct sgiseeq_private *sp = netdev_priv(dev); |
| 530 | struct hpc3_ethregs *hregs = sp->hregs; |
| 531 | unsigned long flags; |
| 532 | struct sgiseeq_tx_desc *td; |
| 533 | int skblen, len, entry; |
| 534 | |
| 535 | spin_lock_irqsave(&sp->tx_lock, flags); |
| 536 | |
| 537 | /* Setup... */ |
| 538 | skblen = skb->len; |
| 539 | len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen; |
| 540 | sp->stats.tx_bytes += len; |
| 541 | entry = sp->tx_new; |
| 542 | td = &sp->tx_desc[entry]; |
| 543 | |
| 544 | /* Create entry. There are so many races with adding a new |
| 545 | * descriptor to the chain: |
| 546 | * 1) Assume that the HPC is off processing a DMA chain while |
| 547 | * we are changing all of the following. |
| 548 | * 2) Do no allow the HPC to look at a new descriptor until |
| 549 | * we have completely set up it's state. This means, do |
| 550 | * not clear HPCDMA_EOX in the current last descritptor |
| 551 | * until the one we are adding looks consistent and could |
| 552 | * be processes right now. |
| 553 | * 3) The tx interrupt code must notice when we've added a new |
| 554 | * entry and the HPC got to the end of the chain before we |
| 555 | * added this new entry and restarted it. |
| 556 | */ |
| 557 | memcpy((char *)(long)td->buf_vaddr, skb->data, skblen); |
| 558 | if (len != skblen) |
| 559 | memset((char *)(long)td->buf_vaddr + skb->len, 0, len-skblen); |
| 560 | td->tdma.cntinfo = (len & HPCDMA_BCNT) | |
| 561 | HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX; |
| 562 | if (sp->tx_old != sp->tx_new) { |
| 563 | struct sgiseeq_tx_desc *backend; |
| 564 | |
| 565 | backend = &sp->tx_desc[PREV_TX(sp->tx_new)]; |
| 566 | backend->tdma.cntinfo &= ~HPCDMA_EOX; |
| 567 | } |
| 568 | sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */ |
| 569 | |
| 570 | /* Maybe kick the HPC back into motion. */ |
| 571 | if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE)) |
| 572 | kick_tx(&sp->tx_desc[sp->tx_old], hregs); |
| 573 | |
| 574 | dev->trans_start = jiffies; |
| 575 | dev_kfree_skb(skb); |
| 576 | |
| 577 | if (!TX_BUFFS_AVAIL(sp)) |
| 578 | netif_stop_queue(dev); |
| 579 | spin_unlock_irqrestore(&sp->tx_lock, flags); |
| 580 | |
| 581 | return 0; |
| 582 | } |
| 583 | |
| 584 | static void timeout(struct net_device *dev) |
| 585 | { |
| 586 | printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name); |
| 587 | sgiseeq_reset(dev); |
| 588 | |
| 589 | dev->trans_start = jiffies; |
| 590 | netif_wake_queue(dev); |
| 591 | } |
| 592 | |
| 593 | static struct net_device_stats *sgiseeq_get_stats(struct net_device *dev) |
| 594 | { |
| 595 | struct sgiseeq_private *sp = netdev_priv(dev); |
| 596 | |
| 597 | return &sp->stats; |
| 598 | } |
| 599 | |
| 600 | static void sgiseeq_set_multicast(struct net_device *dev) |
| 601 | { |
| 602 | struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv; |
| 603 | unsigned char oldmode = sp->mode; |
| 604 | |
| 605 | if(dev->flags & IFF_PROMISC) |
| 606 | sp->mode = SEEQ_RCMD_RANY; |
| 607 | else if ((dev->flags & IFF_ALLMULTI) || dev->mc_count) |
| 608 | sp->mode = SEEQ_RCMD_RBMCAST; |
| 609 | else |
| 610 | sp->mode = SEEQ_RCMD_RBCAST; |
| 611 | |
| 612 | /* XXX I know this sucks, but is there a better way to reprogram |
| 613 | * XXX the receiver? At least, this shouldn't happen too often. |
| 614 | */ |
| 615 | |
| 616 | if (oldmode != sp->mode) |
| 617 | sgiseeq_reset(dev); |
| 618 | } |
| 619 | |
| 620 | static inline void setup_tx_ring(struct sgiseeq_tx_desc *buf, int nbufs) |
| 621 | { |
| 622 | int i = 0; |
| 623 | |
| 624 | while (i < (nbufs - 1)) { |
| 625 | buf[i].tdma.pnext = CPHYSADDR(buf + i + 1); |
| 626 | buf[i].tdma.pbuf = 0; |
| 627 | i++; |
| 628 | } |
| 629 | buf[i].tdma.pnext = CPHYSADDR(buf); |
| 630 | } |
| 631 | |
| 632 | static inline void setup_rx_ring(struct sgiseeq_rx_desc *buf, int nbufs) |
| 633 | { |
| 634 | int i = 0; |
| 635 | |
| 636 | while (i < (nbufs - 1)) { |
| 637 | buf[i].rdma.pnext = CPHYSADDR(buf + i + 1); |
| 638 | buf[i].rdma.pbuf = 0; |
| 639 | i++; |
| 640 | } |
| 641 | buf[i].rdma.pbuf = 0; |
| 642 | buf[i].rdma.pnext = CPHYSADDR(buf); |
| 643 | } |
| 644 | |
| 645 | #define ALIGNED(x) ((((unsigned long)(x)) + 0xf) & ~(0xf)) |
| 646 | |
| 647 | static int sgiseeq_init(struct hpc3_regs* regs, int irq) |
| 648 | { |
| 649 | struct sgiseeq_init_block *sr; |
| 650 | struct sgiseeq_private *sp; |
| 651 | struct net_device *dev; |
| 652 | int err, i; |
| 653 | |
| 654 | dev = alloc_etherdev(sizeof (struct sgiseeq_private)); |
| 655 | if (!dev) { |
| 656 | printk(KERN_ERR "Sgiseeq: Etherdev alloc failed, aborting.\n"); |
| 657 | err = -ENOMEM; |
| 658 | goto err_out; |
| 659 | } |
| 660 | sp = netdev_priv(dev); |
| 661 | |
| 662 | /* Make private data page aligned */ |
| 663 | sr = (struct sgiseeq_init_block *) get_zeroed_page(GFP_KERNEL); |
| 664 | if (!sr) { |
| 665 | printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n"); |
| 666 | err = -ENOMEM; |
| 667 | goto err_out_free_dev; |
| 668 | } |
| 669 | sp->srings = sr; |
| 670 | |
| 671 | #define EADDR_NVOFS 250 |
| 672 | for (i = 0; i < 3; i++) { |
| 673 | unsigned short tmp = ip22_nvram_read(EADDR_NVOFS / 2 + i); |
| 674 | |
| 675 | dev->dev_addr[2 * i] = tmp >> 8; |
| 676 | dev->dev_addr[2 * i + 1] = tmp & 0xff; |
| 677 | } |
| 678 | |
| 679 | #ifdef DEBUG |
| 680 | gpriv = sp; |
| 681 | gdev = dev; |
| 682 | #endif |
| 683 | sp->sregs = (struct sgiseeq_regs *) &hpc3c0->eth_ext[0]; |
| 684 | sp->hregs = &hpc3c0->ethregs; |
| 685 | sp->name = sgiseeqstr; |
| 686 | sp->mode = SEEQ_RCMD_RBCAST; |
| 687 | |
| 688 | sp->rx_desc = (struct sgiseeq_rx_desc *) |
| 689 | CKSEG1ADDR(ALIGNED(&sp->srings->rxvector[0])); |
| 690 | dma_cache_wback_inv((unsigned long)&sp->srings->rxvector, |
| 691 | sizeof(sp->srings->rxvector)); |
| 692 | sp->tx_desc = (struct sgiseeq_tx_desc *) |
| 693 | CKSEG1ADDR(ALIGNED(&sp->srings->txvector[0])); |
| 694 | dma_cache_wback_inv((unsigned long)&sp->srings->txvector, |
| 695 | sizeof(sp->srings->txvector)); |
| 696 | |
| 697 | /* A couple calculations now, saves many cycles later. */ |
| 698 | setup_rx_ring(sp->rx_desc, SEEQ_RX_BUFFERS); |
| 699 | setup_tx_ring(sp->tx_desc, SEEQ_TX_BUFFERS); |
| 700 | |
| 701 | /* Reset the chip. */ |
| 702 | hpc3_eth_reset(sp->hregs); |
| 703 | |
| 704 | sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff); |
| 705 | if (sp->is_edlc) |
| 706 | sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT | |
| 707 | SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT | |
| 708 | SEEQ_CTRL_ENCARR; |
| 709 | |
| 710 | dev->open = sgiseeq_open; |
| 711 | dev->stop = sgiseeq_close; |
| 712 | dev->hard_start_xmit = sgiseeq_start_xmit; |
| 713 | dev->tx_timeout = timeout; |
| 714 | dev->watchdog_timeo = (200 * HZ) / 1000; |
| 715 | dev->get_stats = sgiseeq_get_stats; |
| 716 | dev->set_multicast_list = sgiseeq_set_multicast; |
| 717 | dev->set_mac_address = sgiseeq_set_mac_address; |
| 718 | dev->irq = irq; |
| 719 | |
| 720 | if (register_netdev(dev)) { |
| 721 | printk(KERN_ERR "Sgiseeq: Cannot register net device, " |
| 722 | "aborting.\n"); |
| 723 | err = -ENODEV; |
| 724 | goto err_out_free_page; |
| 725 | } |
| 726 | |
| 727 | printk(KERN_INFO "%s: SGI Seeq8003 ", dev->name); |
| 728 | for (i = 0; i < 6; i++) |
| 729 | printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':'); |
| 730 | |
| 731 | sp->next_module = root_sgiseeq_dev; |
| 732 | root_sgiseeq_dev = dev; |
| 733 | |
| 734 | return 0; |
| 735 | |
| 736 | err_out_free_page: |
| 737 | free_page((unsigned long) sp); |
| 738 | err_out_free_dev: |
| 739 | kfree(dev); |
| 740 | |
| 741 | err_out: |
| 742 | return err; |
| 743 | } |
| 744 | |
| 745 | static int __init sgiseeq_probe(void) |
| 746 | { |
| 747 | printk(version); |
| 748 | |
| 749 | /* On board adapter on 1st HPC is always present */ |
| 750 | return sgiseeq_init(hpc3c0, SGI_ENET_IRQ); |
| 751 | } |
| 752 | |
| 753 | static void __exit sgiseeq_exit(void) |
| 754 | { |
| 755 | struct net_device *next, *dev; |
| 756 | struct sgiseeq_private *sp; |
| 757 | int irq; |
| 758 | |
| 759 | for (dev = root_sgiseeq_dev; dev; dev = next) { |
| 760 | sp = (struct sgiseeq_private *) netdev_priv(dev); |
| 761 | next = sp->next_module; |
| 762 | irq = dev->irq; |
| 763 | unregister_netdev(dev); |
| 764 | free_irq(irq, dev); |
| 765 | free_page((unsigned long) sp); |
| 766 | free_netdev(dev); |
| 767 | } |
| 768 | } |
| 769 | |
| 770 | module_init(sgiseeq_probe); |
| 771 | module_exit(sgiseeq_exit); |
| 772 | |
| 773 | MODULE_LICENSE("GPL"); |