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Linux/drivers/atm/nicstar.c

  1 /*
  2  * nicstar.c
  3  *
  4  * Device driver supporting CBR for IDT 77201/77211 "NICStAR" based cards.
  5  *
  6  * IMPORTANT: The included file nicstarmac.c was NOT WRITTEN BY ME.
  7  *            It was taken from the frle-0.22 device driver.
  8  *            As the file doesn't have a copyright notice, in the file
  9  *            nicstarmac.copyright I put the copyright notice from the
 10  *            frle-0.22 device driver.
 11  *            Some code is based on the nicstar driver by M. Welsh.
 12  *
 13  * Author: Rui Prior (rprior@inescn.pt)
 14  * PowerPC support by Jay Talbott (jay_talbott@mcg.mot.com) April 1999
 15  *
 16  *
 17  * (C) INESC 1999
 18  */
 19 
 20 /*
 21  * IMPORTANT INFORMATION
 22  *
 23  * There are currently three types of spinlocks:
 24  *
 25  * 1 - Per card interrupt spinlock (to protect structures and such)
 26  * 2 - Per SCQ scq spinlock
 27  * 3 - Per card resource spinlock (to access registers, etc.)
 28  *
 29  * These must NEVER be grabbed in reverse order.
 30  *
 31  */
 32 
 33 /* Header files */
 34 
 35 #include <linux/module.h>
 36 #include <linux/kernel.h>
 37 #include <linux/skbuff.h>
 38 #include <linux/atmdev.h>
 39 #include <linux/atm.h>
 40 #include <linux/pci.h>
 41 #include <linux/dma-mapping.h>
 42 #include <linux/types.h>
 43 #include <linux/string.h>
 44 #include <linux/delay.h>
 45 #include <linux/init.h>
 46 #include <linux/sched.h>
 47 #include <linux/timer.h>
 48 #include <linux/interrupt.h>
 49 #include <linux/bitops.h>
 50 #include <linux/slab.h>
 51 #include <linux/idr.h>
 52 #include <asm/io.h>
 53 #include <asm/uaccess.h>
 54 #include <linux/atomic.h>
 55 #include <linux/etherdevice.h>
 56 #include "nicstar.h"
 57 #ifdef CONFIG_ATM_NICSTAR_USE_SUNI
 58 #include "suni.h"
 59 #endif /* CONFIG_ATM_NICSTAR_USE_SUNI */
 60 #ifdef CONFIG_ATM_NICSTAR_USE_IDT77105
 61 #include "idt77105.h"
 62 #endif /* CONFIG_ATM_NICSTAR_USE_IDT77105 */
 63 
 64 /* Additional code */
 65 
 66 #include "nicstarmac.c"
 67 
 68 /* Configurable parameters */
 69 
 70 #undef PHY_LOOPBACK
 71 #undef TX_DEBUG
 72 #undef RX_DEBUG
 73 #undef GENERAL_DEBUG
 74 #undef EXTRA_DEBUG
 75 
 76 /* Do not touch these */
 77 
 78 #ifdef TX_DEBUG
 79 #define TXPRINTK(args...) printk(args)
 80 #else
 81 #define TXPRINTK(args...)
 82 #endif /* TX_DEBUG */
 83 
 84 #ifdef RX_DEBUG
 85 #define RXPRINTK(args...) printk(args)
 86 #else
 87 #define RXPRINTK(args...)
 88 #endif /* RX_DEBUG */
 89 
 90 #ifdef GENERAL_DEBUG
 91 #define PRINTK(args...) printk(args)
 92 #else
 93 #define PRINTK(args...)
 94 #endif /* GENERAL_DEBUG */
 95 
 96 #ifdef EXTRA_DEBUG
 97 #define XPRINTK(args...) printk(args)
 98 #else
 99 #define XPRINTK(args...)
100 #endif /* EXTRA_DEBUG */
101 
102 /* Macros */
103 
104 #define CMD_BUSY(card) (readl((card)->membase + STAT) & NS_STAT_CMDBZ)
105 
106 #define NS_DELAY mdelay(1)
107 
108 #define PTR_DIFF(a, b)  ((u32)((unsigned long)(a) - (unsigned long)(b)))
109 
110 #ifndef ATM_SKB
111 #define ATM_SKB(s) (&(s)->atm)
112 #endif
113 
114 #define scq_virt_to_bus(scq, p) \
115                 (scq->dma + ((unsigned long)(p) - (unsigned long)(scq)->org))
116 
117 /* Function declarations */
118 
119 static u32 ns_read_sram(ns_dev * card, u32 sram_address);
120 static void ns_write_sram(ns_dev * card, u32 sram_address, u32 * value,
121                           int count);
122 static int ns_init_card(int i, struct pci_dev *pcidev);
123 static void ns_init_card_error(ns_dev * card, int error);
124 static scq_info *get_scq(ns_dev *card, int size, u32 scd);
125 static void free_scq(ns_dev *card, scq_info * scq, struct atm_vcc *vcc);
126 static void push_rxbufs(ns_dev *, struct sk_buff *);
127 static irqreturn_t ns_irq_handler(int irq, void *dev_id);
128 static int ns_open(struct atm_vcc *vcc);
129 static void ns_close(struct atm_vcc *vcc);
130 static void fill_tst(ns_dev * card, int n, vc_map * vc);
131 static int ns_send(struct atm_vcc *vcc, struct sk_buff *skb);
132 static int push_scqe(ns_dev * card, vc_map * vc, scq_info * scq, ns_scqe * tbd,
133                      struct sk_buff *skb);
134 static void process_tsq(ns_dev * card);
135 static void drain_scq(ns_dev * card, scq_info * scq, int pos);
136 static void process_rsq(ns_dev * card);
137 static void dequeue_rx(ns_dev * card, ns_rsqe * rsqe);
138 static void recycle_rx_buf(ns_dev * card, struct sk_buff *skb);
139 static void recycle_iovec_rx_bufs(ns_dev * card, struct iovec *iov, int count);
140 static void recycle_iov_buf(ns_dev * card, struct sk_buff *iovb);
141 static void dequeue_sm_buf(ns_dev * card, struct sk_buff *sb);
142 static void dequeue_lg_buf(ns_dev * card, struct sk_buff *lb);
143 static int ns_proc_read(struct atm_dev *dev, loff_t * pos, char *page);
144 static int ns_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg);
145 #ifdef EXTRA_DEBUG
146 static void which_list(ns_dev * card, struct sk_buff *skb);
147 #endif
148 static void ns_poll(unsigned long arg);
149 static void ns_phy_put(struct atm_dev *dev, unsigned char value,
150                        unsigned long addr);
151 static unsigned char ns_phy_get(struct atm_dev *dev, unsigned long addr);
152 
153 /* Global variables */
154 
155 static struct ns_dev *cards[NS_MAX_CARDS];
156 static unsigned num_cards;
157 static struct atmdev_ops atm_ops = {
158         .open = ns_open,
159         .close = ns_close,
160         .ioctl = ns_ioctl,
161         .send = ns_send,
162         .phy_put = ns_phy_put,
163         .phy_get = ns_phy_get,
164         .proc_read = ns_proc_read,
165         .owner = THIS_MODULE,
166 };
167 
168 static struct timer_list ns_timer;
169 static char *mac[NS_MAX_CARDS];
170 module_param_array(mac, charp, NULL, 0);
171 MODULE_LICENSE("GPL");
172 
173 /* Functions */
174 
175 static int nicstar_init_one(struct pci_dev *pcidev,
176                             const struct pci_device_id *ent)
177 {
178         static int index = -1;
179         unsigned int error;
180 
181         index++;
182         cards[index] = NULL;
183 
184         error = ns_init_card(index, pcidev);
185         if (error) {
186                 cards[index--] = NULL;  /* don't increment index */
187                 goto err_out;
188         }
189 
190         return 0;
191 err_out:
192         return -ENODEV;
193 }
194 
195 static void nicstar_remove_one(struct pci_dev *pcidev)
196 {
197         int i, j;
198         ns_dev *card = pci_get_drvdata(pcidev);
199         struct sk_buff *hb;
200         struct sk_buff *iovb;
201         struct sk_buff *lb;
202         struct sk_buff *sb;
203 
204         i = card->index;
205 
206         if (cards[i] == NULL)
207                 return;
208 
209         if (card->atmdev->phy && card->atmdev->phy->stop)
210                 card->atmdev->phy->stop(card->atmdev);
211 
212         /* Stop everything */
213         writel(0x00000000, card->membase + CFG);
214 
215         /* De-register device */
216         atm_dev_deregister(card->atmdev);
217 
218         /* Disable PCI device */
219         pci_disable_device(pcidev);
220 
221         /* Free up resources */
222         j = 0;
223         PRINTK("nicstar%d: freeing %d huge buffers.\n", i, card->hbpool.count);
224         while ((hb = skb_dequeue(&card->hbpool.queue)) != NULL) {
225                 dev_kfree_skb_any(hb);
226                 j++;
227         }
228         PRINTK("nicstar%d: %d huge buffers freed.\n", i, j);
229         j = 0;
230         PRINTK("nicstar%d: freeing %d iovec buffers.\n", i,
231                card->iovpool.count);
232         while ((iovb = skb_dequeue(&card->iovpool.queue)) != NULL) {
233                 dev_kfree_skb_any(iovb);
234                 j++;
235         }
236         PRINTK("nicstar%d: %d iovec buffers freed.\n", i, j);
237         while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
238                 dev_kfree_skb_any(lb);
239         while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
240                 dev_kfree_skb_any(sb);
241         free_scq(card, card->scq0, NULL);
242         for (j = 0; j < NS_FRSCD_NUM; j++) {
243                 if (card->scd2vc[j] != NULL)
244                         free_scq(card, card->scd2vc[j]->scq, card->scd2vc[j]->tx_vcc);
245         }
246         idr_destroy(&card->idr);
247         dma_free_coherent(&card->pcidev->dev, NS_RSQSIZE + NS_RSQ_ALIGNMENT,
248                           card->rsq.org, card->rsq.dma);
249         dma_free_coherent(&card->pcidev->dev, NS_TSQSIZE + NS_TSQ_ALIGNMENT,
250                           card->tsq.org, card->tsq.dma);
251         free_irq(card->pcidev->irq, card);
252         iounmap(card->membase);
253         kfree(card);
254 }
255 
256 static struct pci_device_id nicstar_pci_tbl[] = {
257         { PCI_VDEVICE(IDT, PCI_DEVICE_ID_IDT_IDT77201), 0 },
258         {0,}                    /* terminate list */
259 };
260 
261 MODULE_DEVICE_TABLE(pci, nicstar_pci_tbl);
262 
263 static struct pci_driver nicstar_driver = {
264         .name = "nicstar",
265         .id_table = nicstar_pci_tbl,
266         .probe = nicstar_init_one,
267         .remove = nicstar_remove_one,
268 };
269 
270 static int __init nicstar_init(void)
271 {
272         unsigned error = 0;     /* Initialized to remove compile warning */
273 
274         XPRINTK("nicstar: nicstar_init() called.\n");
275 
276         error = pci_register_driver(&nicstar_driver);
277 
278         TXPRINTK("nicstar: TX debug enabled.\n");
279         RXPRINTK("nicstar: RX debug enabled.\n");
280         PRINTK("nicstar: General debug enabled.\n");
281 #ifdef PHY_LOOPBACK
282         printk("nicstar: using PHY loopback.\n");
283 #endif /* PHY_LOOPBACK */
284         XPRINTK("nicstar: nicstar_init() returned.\n");
285 
286         if (!error) {
287                 init_timer(&ns_timer);
288                 ns_timer.expires = jiffies + NS_POLL_PERIOD;
289                 ns_timer.data = 0UL;
290                 ns_timer.function = ns_poll;
291                 add_timer(&ns_timer);
292         }
293 
294         return error;
295 }
296 
297 static void __exit nicstar_cleanup(void)
298 {
299         XPRINTK("nicstar: nicstar_cleanup() called.\n");
300 
301         del_timer(&ns_timer);
302 
303         pci_unregister_driver(&nicstar_driver);
304 
305         XPRINTK("nicstar: nicstar_cleanup() returned.\n");
306 }
307 
308 static u32 ns_read_sram(ns_dev * card, u32 sram_address)
309 {
310         unsigned long flags;
311         u32 data;
312         sram_address <<= 2;
313         sram_address &= 0x0007FFFC;     /* address must be dword aligned */
314         sram_address |= 0x50000000;     /* SRAM read command */
315         spin_lock_irqsave(&card->res_lock, flags);
316         while (CMD_BUSY(card)) ;
317         writel(sram_address, card->membase + CMD);
318         while (CMD_BUSY(card)) ;
319         data = readl(card->membase + DR0);
320         spin_unlock_irqrestore(&card->res_lock, flags);
321         return data;
322 }
323 
324 static void ns_write_sram(ns_dev * card, u32 sram_address, u32 * value,
325                           int count)
326 {
327         unsigned long flags;
328         int i, c;
329         count--;                /* count range now is 0..3 instead of 1..4 */
330         c = count;
331         c <<= 2;                /* to use increments of 4 */
332         spin_lock_irqsave(&card->res_lock, flags);
333         while (CMD_BUSY(card)) ;
334         for (i = 0; i <= c; i += 4)
335                 writel(*(value++), card->membase + i);
336         /* Note: DR# registers are the first 4 dwords in nicstar's memspace,
337            so card->membase + DR0 == card->membase */
338         sram_address <<= 2;
339         sram_address &= 0x0007FFFC;
340         sram_address |= (0x40000000 | count);
341         writel(sram_address, card->membase + CMD);
342         spin_unlock_irqrestore(&card->res_lock, flags);
343 }
344 
345 static int ns_init_card(int i, struct pci_dev *pcidev)
346 {
347         int j;
348         struct ns_dev *card = NULL;
349         unsigned char pci_latency;
350         unsigned error;
351         u32 data;
352         u32 u32d[4];
353         u32 ns_cfg_rctsize;
354         int bcount;
355         unsigned long membase;
356 
357         error = 0;
358 
359         if (pci_enable_device(pcidev)) {
360                 printk("nicstar%d: can't enable PCI device\n", i);
361                 error = 2;
362                 ns_init_card_error(card, error);
363                 return error;
364         }
365         if (dma_set_mask_and_coherent(&pcidev->dev, DMA_BIT_MASK(32)) != 0) {
366                 printk(KERN_WARNING
367                        "nicstar%d: No suitable DMA available.\n", i);
368                 error = 2;
369                 ns_init_card_error(card, error);
370                 return error;
371         }
372 
373         if ((card = kmalloc(sizeof(ns_dev), GFP_KERNEL)) == NULL) {
374                 printk
375                     ("nicstar%d: can't allocate memory for device structure.\n",
376                      i);
377                 error = 2;
378                 ns_init_card_error(card, error);
379                 return error;
380         }
381         cards[i] = card;
382         spin_lock_init(&card->int_lock);
383         spin_lock_init(&card->res_lock);
384 
385         pci_set_drvdata(pcidev, card);
386 
387         card->index = i;
388         card->atmdev = NULL;
389         card->pcidev = pcidev;
390         membase = pci_resource_start(pcidev, 1);
391         card->membase = ioremap(membase, NS_IOREMAP_SIZE);
392         if (!card->membase) {
393                 printk("nicstar%d: can't ioremap() membase.\n", i);
394                 error = 3;
395                 ns_init_card_error(card, error);
396                 return error;
397         }
398         PRINTK("nicstar%d: membase at 0x%p.\n", i, card->membase);
399 
400         pci_set_master(pcidev);
401 
402         if (pci_read_config_byte(pcidev, PCI_LATENCY_TIMER, &pci_latency) != 0) {
403                 printk("nicstar%d: can't read PCI latency timer.\n", i);
404                 error = 6;
405                 ns_init_card_error(card, error);
406                 return error;
407         }
408 #ifdef NS_PCI_LATENCY
409         if (pci_latency < NS_PCI_LATENCY) {
410                 PRINTK("nicstar%d: setting PCI latency timer to %d.\n", i,
411                        NS_PCI_LATENCY);
412                 for (j = 1; j < 4; j++) {
413                         if (pci_write_config_byte
414                             (pcidev, PCI_LATENCY_TIMER, NS_PCI_LATENCY) != 0)
415                                 break;
416                 }
417                 if (j == 4) {
418                         printk
419                             ("nicstar%d: can't set PCI latency timer to %d.\n",
420                              i, NS_PCI_LATENCY);
421                         error = 7;
422                         ns_init_card_error(card, error);
423                         return error;
424                 }
425         }
426 #endif /* NS_PCI_LATENCY */
427 
428         /* Clear timer overflow */
429         data = readl(card->membase + STAT);
430         if (data & NS_STAT_TMROF)
431                 writel(NS_STAT_TMROF, card->membase + STAT);
432 
433         /* Software reset */
434         writel(NS_CFG_SWRST, card->membase + CFG);
435         NS_DELAY;
436         writel(0x00000000, card->membase + CFG);
437 
438         /* PHY reset */
439         writel(0x00000008, card->membase + GP);
440         NS_DELAY;
441         writel(0x00000001, card->membase + GP);
442         NS_DELAY;
443         while (CMD_BUSY(card)) ;
444         writel(NS_CMD_WRITE_UTILITY | 0x00000100, card->membase + CMD); /* Sync UTOPIA with SAR clock */
445         NS_DELAY;
446 
447         /* Detect PHY type */
448         while (CMD_BUSY(card)) ;
449         writel(NS_CMD_READ_UTILITY | 0x00000200, card->membase + CMD);
450         while (CMD_BUSY(card)) ;
451         data = readl(card->membase + DR0);
452         switch (data) {
453         case 0x00000009:
454                 printk("nicstar%d: PHY seems to be 25 Mbps.\n", i);
455                 card->max_pcr = ATM_25_PCR;
456                 while (CMD_BUSY(card)) ;
457                 writel(0x00000008, card->membase + DR0);
458                 writel(NS_CMD_WRITE_UTILITY | 0x00000200, card->membase + CMD);
459                 /* Clear an eventual pending interrupt */
460                 writel(NS_STAT_SFBQF, card->membase + STAT);
461 #ifdef PHY_LOOPBACK
462                 while (CMD_BUSY(card)) ;
463                 writel(0x00000022, card->membase + DR0);
464                 writel(NS_CMD_WRITE_UTILITY | 0x00000202, card->membase + CMD);
465 #endif /* PHY_LOOPBACK */
466                 break;
467         case 0x00000030:
468         case 0x00000031:
469                 printk("nicstar%d: PHY seems to be 155 Mbps.\n", i);
470                 card->max_pcr = ATM_OC3_PCR;
471 #ifdef PHY_LOOPBACK
472                 while (CMD_BUSY(card)) ;
473                 writel(0x00000002, card->membase + DR0);
474                 writel(NS_CMD_WRITE_UTILITY | 0x00000205, card->membase + CMD);
475 #endif /* PHY_LOOPBACK */
476                 break;
477         default:
478                 printk("nicstar%d: unknown PHY type (0x%08X).\n", i, data);
479                 error = 8;
480                 ns_init_card_error(card, error);
481                 return error;
482         }
483         writel(0x00000000, card->membase + GP);
484 
485         /* Determine SRAM size */
486         data = 0x76543210;
487         ns_write_sram(card, 0x1C003, &data, 1);
488         data = 0x89ABCDEF;
489         ns_write_sram(card, 0x14003, &data, 1);
490         if (ns_read_sram(card, 0x14003) == 0x89ABCDEF &&
491             ns_read_sram(card, 0x1C003) == 0x76543210)
492                 card->sram_size = 128;
493         else
494                 card->sram_size = 32;
495         PRINTK("nicstar%d: %dK x 32bit SRAM size.\n", i, card->sram_size);
496 
497         card->rct_size = NS_MAX_RCTSIZE;
498 
499 #if (NS_MAX_RCTSIZE == 4096)
500         if (card->sram_size == 128)
501                 printk
502                     ("nicstar%d: limiting maximum VCI. See NS_MAX_RCTSIZE in nicstar.h\n",
503                      i);
504 #elif (NS_MAX_RCTSIZE == 16384)
505         if (card->sram_size == 32) {
506                 printk
507                     ("nicstar%d: wasting memory. See NS_MAX_RCTSIZE in nicstar.h\n",
508                      i);
509                 card->rct_size = 4096;
510         }
511 #else
512 #error NS_MAX_RCTSIZE must be either 4096 or 16384 in nicstar.c
513 #endif
514 
515         card->vpibits = NS_VPIBITS;
516         if (card->rct_size == 4096)
517                 card->vcibits = 12 - NS_VPIBITS;
518         else                    /* card->rct_size == 16384 */
519                 card->vcibits = 14 - NS_VPIBITS;
520 
521         /* Initialize the nicstar eeprom/eprom stuff, for the MAC addr */
522         if (mac[i] == NULL)
523                 nicstar_init_eprom(card->membase);
524 
525         /* Set the VPI/VCI MSb mask to zero so we can receive OAM cells */
526         writel(0x00000000, card->membase + VPM);
527 
528         /* Initialize TSQ */
529         card->tsq.org = dma_alloc_coherent(&card->pcidev->dev,
530                                            NS_TSQSIZE + NS_TSQ_ALIGNMENT,
531                                            &card->tsq.dma, GFP_KERNEL);
532         if (card->tsq.org == NULL) {
533                 printk("nicstar%d: can't allocate TSQ.\n", i);
534                 error = 10;
535                 ns_init_card_error(card, error);
536                 return error;
537         }
538         card->tsq.base = PTR_ALIGN(card->tsq.org, NS_TSQ_ALIGNMENT);
539         card->tsq.next = card->tsq.base;
540         card->tsq.last = card->tsq.base + (NS_TSQ_NUM_ENTRIES - 1);
541         for (j = 0; j < NS_TSQ_NUM_ENTRIES; j++)
542                 ns_tsi_init(card->tsq.base + j);
543         writel(0x00000000, card->membase + TSQH);
544         writel(ALIGN(card->tsq.dma, NS_TSQ_ALIGNMENT), card->membase + TSQB);
545         PRINTK("nicstar%d: TSQ base at 0x%p.\n", i, card->tsq.base);
546 
547         /* Initialize RSQ */
548         card->rsq.org = dma_alloc_coherent(&card->pcidev->dev,
549                                            NS_RSQSIZE + NS_RSQ_ALIGNMENT,
550                                            &card->rsq.dma, GFP_KERNEL);
551         if (card->rsq.org == NULL) {
552                 printk("nicstar%d: can't allocate RSQ.\n", i);
553                 error = 11;
554                 ns_init_card_error(card, error);
555                 return error;
556         }
557         card->rsq.base = PTR_ALIGN(card->rsq.org, NS_RSQ_ALIGNMENT);
558         card->rsq.next = card->rsq.base;
559         card->rsq.last = card->rsq.base + (NS_RSQ_NUM_ENTRIES - 1);
560         for (j = 0; j < NS_RSQ_NUM_ENTRIES; j++)
561                 ns_rsqe_init(card->rsq.base + j);
562         writel(0x00000000, card->membase + RSQH);
563         writel(ALIGN(card->rsq.dma, NS_RSQ_ALIGNMENT), card->membase + RSQB);
564         PRINTK("nicstar%d: RSQ base at 0x%p.\n", i, card->rsq.base);
565 
566         /* Initialize SCQ0, the only VBR SCQ used */
567         card->scq1 = NULL;
568         card->scq2 = NULL;
569         card->scq0 = get_scq(card, VBR_SCQSIZE, NS_VRSCD0);
570         if (card->scq0 == NULL) {
571                 printk("nicstar%d: can't get SCQ0.\n", i);
572                 error = 12;
573                 ns_init_card_error(card, error);
574                 return error;
575         }
576         u32d[0] = scq_virt_to_bus(card->scq0, card->scq0->base);
577         u32d[1] = (u32) 0x00000000;
578         u32d[2] = (u32) 0xffffffff;
579         u32d[3] = (u32) 0x00000000;
580         ns_write_sram(card, NS_VRSCD0, u32d, 4);
581         ns_write_sram(card, NS_VRSCD1, u32d, 4);        /* These last two won't be used */
582         ns_write_sram(card, NS_VRSCD2, u32d, 4);        /* but are initialized, just in case... */
583         card->scq0->scd = NS_VRSCD0;
584         PRINTK("nicstar%d: VBR-SCQ0 base at 0x%p.\n", i, card->scq0->base);
585 
586         /* Initialize TSTs */
587         card->tst_addr = NS_TST0;
588         card->tst_free_entries = NS_TST_NUM_ENTRIES;
589         data = NS_TST_OPCODE_VARIABLE;
590         for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
591                 ns_write_sram(card, NS_TST0 + j, &data, 1);
592         data = ns_tste_make(NS_TST_OPCODE_END, NS_TST0);
593         ns_write_sram(card, NS_TST0 + NS_TST_NUM_ENTRIES, &data, 1);
594         for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
595                 ns_write_sram(card, NS_TST1 + j, &data, 1);
596         data = ns_tste_make(NS_TST_OPCODE_END, NS_TST1);
597         ns_write_sram(card, NS_TST1 + NS_TST_NUM_ENTRIES, &data, 1);
598         for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
599                 card->tste2vc[j] = NULL;
600         writel(NS_TST0 << 2, card->membase + TSTB);
601 
602         /* Initialize RCT. AAL type is set on opening the VC. */
603 #ifdef RCQ_SUPPORT
604         u32d[0] = NS_RCTE_RAWCELLINTEN;
605 #else
606         u32d[0] = 0x00000000;
607 #endif /* RCQ_SUPPORT */
608         u32d[1] = 0x00000000;
609         u32d[2] = 0x00000000;
610         u32d[3] = 0xFFFFFFFF;
611         for (j = 0; j < card->rct_size; j++)
612                 ns_write_sram(card, j * 4, u32d, 4);
613 
614         memset(card->vcmap, 0, NS_MAX_RCTSIZE * sizeof(vc_map));
615 
616         for (j = 0; j < NS_FRSCD_NUM; j++)
617                 card->scd2vc[j] = NULL;
618 
619         /* Initialize buffer levels */
620         card->sbnr.min = MIN_SB;
621         card->sbnr.init = NUM_SB;
622         card->sbnr.max = MAX_SB;
623         card->lbnr.min = MIN_LB;
624         card->lbnr.init = NUM_LB;
625         card->lbnr.max = MAX_LB;
626         card->iovnr.min = MIN_IOVB;
627         card->iovnr.init = NUM_IOVB;
628         card->iovnr.max = MAX_IOVB;
629         card->hbnr.min = MIN_HB;
630         card->hbnr.init = NUM_HB;
631         card->hbnr.max = MAX_HB;
632 
633         card->sm_handle = NULL;
634         card->sm_addr = 0x00000000;
635         card->lg_handle = NULL;
636         card->lg_addr = 0x00000000;
637 
638         card->efbie = 1;        /* To prevent push_rxbufs from enabling the interrupt */
639 
640         idr_init(&card->idr);
641 
642         /* Pre-allocate some huge buffers */
643         skb_queue_head_init(&card->hbpool.queue);
644         card->hbpool.count = 0;
645         for (j = 0; j < NUM_HB; j++) {
646                 struct sk_buff *hb;
647                 hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
648                 if (hb == NULL) {
649                         printk
650                             ("nicstar%d: can't allocate %dth of %d huge buffers.\n",
651                              i, j, NUM_HB);
652                         error = 13;
653                         ns_init_card_error(card, error);
654                         return error;
655                 }
656                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
657                 skb_queue_tail(&card->hbpool.queue, hb);
658                 card->hbpool.count++;
659         }
660 
661         /* Allocate large buffers */
662         skb_queue_head_init(&card->lbpool.queue);
663         card->lbpool.count = 0; /* Not used */
664         for (j = 0; j < NUM_LB; j++) {
665                 struct sk_buff *lb;
666                 lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
667                 if (lb == NULL) {
668                         printk
669                             ("nicstar%d: can't allocate %dth of %d large buffers.\n",
670                              i, j, NUM_LB);
671                         error = 14;
672                         ns_init_card_error(card, error);
673                         return error;
674                 }
675                 NS_PRV_BUFTYPE(lb) = BUF_LG;
676                 skb_queue_tail(&card->lbpool.queue, lb);
677                 skb_reserve(lb, NS_SMBUFSIZE);
678                 push_rxbufs(card, lb);
679                 /* Due to the implementation of push_rxbufs() this is 1, not 0 */
680                 if (j == 1) {
681                         card->rcbuf = lb;
682                         card->rawcell = (struct ns_rcqe *) lb->data;
683                         card->rawch = NS_PRV_DMA(lb);
684                 }
685         }
686         /* Test for strange behaviour which leads to crashes */
687         if ((bcount =
688              ns_stat_lfbqc_get(readl(card->membase + STAT))) < card->lbnr.min) {
689                 printk
690                     ("nicstar%d: Strange... Just allocated %d large buffers and lfbqc = %d.\n",
691                      i, j, bcount);
692                 error = 14;
693                 ns_init_card_error(card, error);
694                 return error;
695         }
696 
697         /* Allocate small buffers */
698         skb_queue_head_init(&card->sbpool.queue);
699         card->sbpool.count = 0; /* Not used */
700         for (j = 0; j < NUM_SB; j++) {
701                 struct sk_buff *sb;
702                 sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
703                 if (sb == NULL) {
704                         printk
705                             ("nicstar%d: can't allocate %dth of %d small buffers.\n",
706                              i, j, NUM_SB);
707                         error = 15;
708                         ns_init_card_error(card, error);
709                         return error;
710                 }
711                 NS_PRV_BUFTYPE(sb) = BUF_SM;
712                 skb_queue_tail(&card->sbpool.queue, sb);
713                 skb_reserve(sb, NS_AAL0_HEADER);
714                 push_rxbufs(card, sb);
715         }
716         /* Test for strange behaviour which leads to crashes */
717         if ((bcount =
718              ns_stat_sfbqc_get(readl(card->membase + STAT))) < card->sbnr.min) {
719                 printk
720                     ("nicstar%d: Strange... Just allocated %d small buffers and sfbqc = %d.\n",
721                      i, j, bcount);
722                 error = 15;
723                 ns_init_card_error(card, error);
724                 return error;
725         }
726 
727         /* Allocate iovec buffers */
728         skb_queue_head_init(&card->iovpool.queue);
729         card->iovpool.count = 0;
730         for (j = 0; j < NUM_IOVB; j++) {
731                 struct sk_buff *iovb;
732                 iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
733                 if (iovb == NULL) {
734                         printk
735                             ("nicstar%d: can't allocate %dth of %d iovec buffers.\n",
736                              i, j, NUM_IOVB);
737                         error = 16;
738                         ns_init_card_error(card, error);
739                         return error;
740                 }
741                 NS_PRV_BUFTYPE(iovb) = BUF_NONE;
742                 skb_queue_tail(&card->iovpool.queue, iovb);
743                 card->iovpool.count++;
744         }
745 
746         /* Configure NICStAR */
747         if (card->rct_size == 4096)
748                 ns_cfg_rctsize = NS_CFG_RCTSIZE_4096_ENTRIES;
749         else                    /* (card->rct_size == 16384) */
750                 ns_cfg_rctsize = NS_CFG_RCTSIZE_16384_ENTRIES;
751 
752         card->efbie = 1;
753 
754         card->intcnt = 0;
755         if (request_irq
756             (pcidev->irq, &ns_irq_handler, IRQF_SHARED, "nicstar", card) != 0) {
757                 printk("nicstar%d: can't allocate IRQ %d.\n", i, pcidev->irq);
758                 error = 9;
759                 ns_init_card_error(card, error);
760                 return error;
761         }
762 
763         /* Register device */
764         card->atmdev = atm_dev_register("nicstar", &card->pcidev->dev, &atm_ops,
765                                         -1, NULL);
766         if (card->atmdev == NULL) {
767                 printk("nicstar%d: can't register device.\n", i);
768                 error = 17;
769                 ns_init_card_error(card, error);
770                 return error;
771         }
772 
773         if (mac[i] == NULL || !mac_pton(mac[i], card->atmdev->esi)) {
774                 nicstar_read_eprom(card->membase, NICSTAR_EPROM_MAC_ADDR_OFFSET,
775                                    card->atmdev->esi, 6);
776                 if (ether_addr_equal(card->atmdev->esi, "\x00\x00\x00\x00\x00\x00")) {
777                         nicstar_read_eprom(card->membase,
778                                            NICSTAR_EPROM_MAC_ADDR_OFFSET_ALT,
779                                            card->atmdev->esi, 6);
780                 }
781         }
782 
783         printk("nicstar%d: MAC address %pM\n", i, card->atmdev->esi);
784 
785         card->atmdev->dev_data = card;
786         card->atmdev->ci_range.vpi_bits = card->vpibits;
787         card->atmdev->ci_range.vci_bits = card->vcibits;
788         card->atmdev->link_rate = card->max_pcr;
789         card->atmdev->phy = NULL;
790 
791 #ifdef CONFIG_ATM_NICSTAR_USE_SUNI
792         if (card->max_pcr == ATM_OC3_PCR)
793                 suni_init(card->atmdev);
794 #endif /* CONFIG_ATM_NICSTAR_USE_SUNI */
795 
796 #ifdef CONFIG_ATM_NICSTAR_USE_IDT77105
797         if (card->max_pcr == ATM_25_PCR)
798                 idt77105_init(card->atmdev);
799 #endif /* CONFIG_ATM_NICSTAR_USE_IDT77105 */
800 
801         if (card->atmdev->phy && card->atmdev->phy->start)
802                 card->atmdev->phy->start(card->atmdev);
803 
804         writel(NS_CFG_RXPATH | NS_CFG_SMBUFSIZE | NS_CFG_LGBUFSIZE | NS_CFG_EFBIE | NS_CFG_RSQSIZE | NS_CFG_VPIBITS | ns_cfg_rctsize | NS_CFG_RXINT_NODELAY | NS_CFG_RAWIE |    /* Only enabled if RCQ_SUPPORT */
805                NS_CFG_RSQAFIE | NS_CFG_TXEN | NS_CFG_TXIE | NS_CFG_TSQFIE_OPT | /* Only enabled if ENABLE_TSQFIE */
806                NS_CFG_PHYIE, card->membase + CFG);
807 
808         num_cards++;
809 
810         return error;
811 }
812 
813 static void ns_init_card_error(ns_dev *card, int error)
814 {
815         if (error >= 17) {
816                 writel(0x00000000, card->membase + CFG);
817         }
818         if (error >= 16) {
819                 struct sk_buff *iovb;
820                 while ((iovb = skb_dequeue(&card->iovpool.queue)) != NULL)
821                         dev_kfree_skb_any(iovb);
822         }
823         if (error >= 15) {
824                 struct sk_buff *sb;
825                 while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
826                         dev_kfree_skb_any(sb);
827                 free_scq(card, card->scq0, NULL);
828         }
829         if (error >= 14) {
830                 struct sk_buff *lb;
831                 while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
832                         dev_kfree_skb_any(lb);
833         }
834         if (error >= 13) {
835                 struct sk_buff *hb;
836                 while ((hb = skb_dequeue(&card->hbpool.queue)) != NULL)
837                         dev_kfree_skb_any(hb);
838         }
839         if (error >= 12) {
840                 kfree(card->rsq.org);
841         }
842         if (error >= 11) {
843                 kfree(card->tsq.org);
844         }
845         if (error >= 10) {
846                 free_irq(card->pcidev->irq, card);
847         }
848         if (error >= 4) {
849                 iounmap(card->membase);
850         }
851         if (error >= 3) {
852                 pci_disable_device(card->pcidev);
853                 kfree(card);
854         }
855 }
856 
857 static scq_info *get_scq(ns_dev *card, int size, u32 scd)
858 {
859         scq_info *scq;
860         int i;
861 
862         if (size != VBR_SCQSIZE && size != CBR_SCQSIZE)
863                 return NULL;
864 
865         scq = kmalloc(sizeof(scq_info), GFP_KERNEL);
866         if (!scq)
867                 return NULL;
868         scq->org = dma_alloc_coherent(&card->pcidev->dev,
869                                       2 * size,  &scq->dma, GFP_KERNEL);
870         if (!scq->org) {
871                 kfree(scq);
872                 return NULL;
873         }
874         scq->skb = kmalloc(sizeof(struct sk_buff *) *
875                            (size / NS_SCQE_SIZE), GFP_KERNEL);
876         if (!scq->skb) {
877                 kfree(scq->org);
878                 kfree(scq);
879                 return NULL;
880         }
881         scq->num_entries = size / NS_SCQE_SIZE;
882         scq->base = PTR_ALIGN(scq->org, size);
883         scq->next = scq->base;
884         scq->last = scq->base + (scq->num_entries - 1);
885         scq->tail = scq->last;
886         scq->scd = scd;
887         scq->num_entries = size / NS_SCQE_SIZE;
888         scq->tbd_count = 0;
889         init_waitqueue_head(&scq->scqfull_waitq);
890         scq->full = 0;
891         spin_lock_init(&scq->lock);
892 
893         for (i = 0; i < scq->num_entries; i++)
894                 scq->skb[i] = NULL;
895 
896         return scq;
897 }
898 
899 /* For variable rate SCQ vcc must be NULL */
900 static void free_scq(ns_dev *card, scq_info *scq, struct atm_vcc *vcc)
901 {
902         int i;
903 
904         if (scq->num_entries == VBR_SCQ_NUM_ENTRIES)
905                 for (i = 0; i < scq->num_entries; i++) {
906                         if (scq->skb[i] != NULL) {
907                                 vcc = ATM_SKB(scq->skb[i])->vcc;
908                                 if (vcc->pop != NULL)
909                                         vcc->pop(vcc, scq->skb[i]);
910                                 else
911                                         dev_kfree_skb_any(scq->skb[i]);
912                         }
913         } else {                /* vcc must be != NULL */
914 
915                 if (vcc == NULL) {
916                         printk
917                             ("nicstar: free_scq() called with vcc == NULL for fixed rate scq.");
918                         for (i = 0; i < scq->num_entries; i++)
919                                 dev_kfree_skb_any(scq->skb[i]);
920                 } else
921                         for (i = 0; i < scq->num_entries; i++) {
922                                 if (scq->skb[i] != NULL) {
923                                         if (vcc->pop != NULL)
924                                                 vcc->pop(vcc, scq->skb[i]);
925                                         else
926                                                 dev_kfree_skb_any(scq->skb[i]);
927                                 }
928                         }
929         }
930         kfree(scq->skb);
931         dma_free_coherent(&card->pcidev->dev,
932                           2 * (scq->num_entries == VBR_SCQ_NUM_ENTRIES ?
933                                VBR_SCQSIZE : CBR_SCQSIZE),
934                           scq->org, scq->dma);
935         kfree(scq);
936 }
937 
938 /* The handles passed must be pointers to the sk_buff containing the small
939    or large buffer(s) cast to u32. */
940 static void push_rxbufs(ns_dev * card, struct sk_buff *skb)
941 {
942         struct sk_buff *handle1, *handle2;
943         int id1, id2;
944         u32 addr1, addr2;
945         u32 stat;
946         unsigned long flags;
947 
948         /* *BARF* */
949         handle2 = NULL;
950         addr2 = 0;
951         handle1 = skb;
952         addr1 = dma_map_single(&card->pcidev->dev,
953                                skb->data,
954                                (NS_PRV_BUFTYPE(skb) == BUF_SM
955                                 ? NS_SMSKBSIZE : NS_LGSKBSIZE),
956                                DMA_TO_DEVICE);
957         NS_PRV_DMA(skb) = addr1; /* save so we can unmap later */
958 
959 #ifdef GENERAL_DEBUG
960         if (!addr1)
961                 printk("nicstar%d: push_rxbufs called with addr1 = 0.\n",
962                        card->index);
963 #endif /* GENERAL_DEBUG */
964 
965         stat = readl(card->membase + STAT);
966         card->sbfqc = ns_stat_sfbqc_get(stat);
967         card->lbfqc = ns_stat_lfbqc_get(stat);
968         if (NS_PRV_BUFTYPE(skb) == BUF_SM) {
969                 if (!addr2) {
970                         if (card->sm_addr) {
971                                 addr2 = card->sm_addr;
972                                 handle2 = card->sm_handle;
973                                 card->sm_addr = 0x00000000;
974                                 card->sm_handle = NULL;
975                         } else {        /* (!sm_addr) */
976 
977                                 card->sm_addr = addr1;
978                                 card->sm_handle = handle1;
979                         }
980                 }
981         } else {                /* buf_type == BUF_LG */
982 
983                 if (!addr2) {
984                         if (card->lg_addr) {
985                                 addr2 = card->lg_addr;
986                                 handle2 = card->lg_handle;
987                                 card->lg_addr = 0x00000000;
988                                 card->lg_handle = NULL;
989                         } else {        /* (!lg_addr) */
990 
991                                 card->lg_addr = addr1;
992                                 card->lg_handle = handle1;
993                         }
994                 }
995         }
996 
997         if (addr2) {
998                 if (NS_PRV_BUFTYPE(skb) == BUF_SM) {
999                         if (card->sbfqc >= card->sbnr.max) {
1000                                 skb_unlink(handle1, &card->sbpool.queue);
1001                                 dev_kfree_skb_any(handle1);
1002                                 skb_unlink(handle2, &card->sbpool.queue);
1003                                 dev_kfree_skb_any(handle2);
1004                                 return;
1005                         } else
1006                                 card->sbfqc += 2;
1007                 } else {        /* (buf_type == BUF_LG) */
1008 
1009                         if (card->lbfqc >= card->lbnr.max) {
1010                                 skb_unlink(handle1, &card->lbpool.queue);
1011                                 dev_kfree_skb_any(handle1);
1012                                 skb_unlink(handle2, &card->lbpool.queue);
1013                                 dev_kfree_skb_any(handle2);
1014                                 return;
1015                         } else
1016                                 card->lbfqc += 2;
1017                 }
1018 
1019                 id1 = idr_alloc(&card->idr, handle1, 0, 0, GFP_ATOMIC);
1020                 if (id1 < 0)
1021                         goto out;
1022 
1023                 id2 = idr_alloc(&card->idr, handle2, 0, 0, GFP_ATOMIC);
1024                 if (id2 < 0)
1025                         goto out;
1026 
1027                 spin_lock_irqsave(&card->res_lock, flags);
1028                 while (CMD_BUSY(card)) ;
1029                 writel(addr2, card->membase + DR3);
1030                 writel(id2, card->membase + DR2);
1031                 writel(addr1, card->membase + DR1);
1032                 writel(id1, card->membase + DR0);
1033                 writel(NS_CMD_WRITE_FREEBUFQ | NS_PRV_BUFTYPE(skb),
1034                        card->membase + CMD);
1035                 spin_unlock_irqrestore(&card->res_lock, flags);
1036 
1037                 XPRINTK("nicstar%d: Pushing %s buffers at 0x%x and 0x%x.\n",
1038                         card->index,
1039                         (NS_PRV_BUFTYPE(skb) == BUF_SM ? "small" : "large"),
1040                         addr1, addr2);
1041         }
1042 
1043         if (!card->efbie && card->sbfqc >= card->sbnr.min &&
1044             card->lbfqc >= card->lbnr.min) {
1045                 card->efbie = 1;
1046                 writel((readl(card->membase + CFG) | NS_CFG_EFBIE),
1047                        card->membase + CFG);
1048         }
1049 
1050 out:
1051         return;
1052 }
1053 
1054 static irqreturn_t ns_irq_handler(int irq, void *dev_id)
1055 {
1056         u32 stat_r;
1057         ns_dev *card;
1058         struct atm_dev *dev;
1059         unsigned long flags;
1060 
1061         card = (ns_dev *) dev_id;
1062         dev = card->atmdev;
1063         card->intcnt++;
1064 
1065         PRINTK("nicstar%d: NICStAR generated an interrupt\n", card->index);
1066 
1067         spin_lock_irqsave(&card->int_lock, flags);
1068 
1069         stat_r = readl(card->membase + STAT);
1070 
1071         /* Transmit Status Indicator has been written to T. S. Queue */
1072         if (stat_r & NS_STAT_TSIF) {
1073                 TXPRINTK("nicstar%d: TSI interrupt\n", card->index);
1074                 process_tsq(card);
1075                 writel(NS_STAT_TSIF, card->membase + STAT);
1076         }
1077 
1078         /* Incomplete CS-PDU has been transmitted */
1079         if (stat_r & NS_STAT_TXICP) {
1080                 writel(NS_STAT_TXICP, card->membase + STAT);
1081                 TXPRINTK("nicstar%d: Incomplete CS-PDU transmitted.\n",
1082                          card->index);
1083         }
1084 
1085         /* Transmit Status Queue 7/8 full */
1086         if (stat_r & NS_STAT_TSQF) {
1087                 writel(NS_STAT_TSQF, card->membase + STAT);
1088                 PRINTK("nicstar%d: TSQ full.\n", card->index);
1089                 process_tsq(card);
1090         }
1091 
1092         /* Timer overflow */
1093         if (stat_r & NS_STAT_TMROF) {
1094                 writel(NS_STAT_TMROF, card->membase + STAT);
1095                 PRINTK("nicstar%d: Timer overflow.\n", card->index);
1096         }
1097 
1098         /* PHY device interrupt signal active */
1099         if (stat_r & NS_STAT_PHYI) {
1100                 writel(NS_STAT_PHYI, card->membase + STAT);
1101                 PRINTK("nicstar%d: PHY interrupt.\n", card->index);
1102                 if (dev->phy && dev->phy->interrupt) {
1103                         dev->phy->interrupt(dev);
1104                 }
1105         }
1106 
1107         /* Small Buffer Queue is full */
1108         if (stat_r & NS_STAT_SFBQF) {
1109                 writel(NS_STAT_SFBQF, card->membase + STAT);
1110                 printk("nicstar%d: Small free buffer queue is full.\n",
1111                        card->index);
1112         }
1113 
1114         /* Large Buffer Queue is full */
1115         if (stat_r & NS_STAT_LFBQF) {
1116                 writel(NS_STAT_LFBQF, card->membase + STAT);
1117                 printk("nicstar%d: Large free buffer queue is full.\n",
1118                        card->index);
1119         }
1120 
1121         /* Receive Status Queue is full */
1122         if (stat_r & NS_STAT_RSQF) {
1123                 writel(NS_STAT_RSQF, card->membase + STAT);
1124                 printk("nicstar%d: RSQ full.\n", card->index);
1125                 process_rsq(card);
1126         }
1127 
1128         /* Complete CS-PDU received */
1129         if (stat_r & NS_STAT_EOPDU) {
1130                 RXPRINTK("nicstar%d: End of CS-PDU received.\n", card->index);
1131                 process_rsq(card);
1132                 writel(NS_STAT_EOPDU, card->membase + STAT);
1133         }
1134 
1135         /* Raw cell received */
1136         if (stat_r & NS_STAT_RAWCF) {
1137                 writel(NS_STAT_RAWCF, card->membase + STAT);
1138 #ifndef RCQ_SUPPORT
1139                 printk("nicstar%d: Raw cell received and no support yet...\n",
1140                        card->index);
1141 #endif /* RCQ_SUPPORT */
1142                 /* NOTE: the following procedure may keep a raw cell pending until the
1143                    next interrupt. As this preliminary support is only meant to
1144                    avoid buffer leakage, this is not an issue. */
1145                 while (readl(card->membase + RAWCT) != card->rawch) {
1146 
1147                         if (ns_rcqe_islast(card->rawcell)) {
1148                                 struct sk_buff *oldbuf;
1149 
1150                                 oldbuf = card->rcbuf;
1151                                 card->rcbuf = idr_find(&card->idr,
1152                                                        ns_rcqe_nextbufhandle(card->rawcell));
1153                                 card->rawch = NS_PRV_DMA(card->rcbuf);
1154                                 card->rawcell = (struct ns_rcqe *)
1155                                                 card->rcbuf->data;
1156                                 recycle_rx_buf(card, oldbuf);
1157                         } else {
1158                                 card->rawch += NS_RCQE_SIZE;
1159                                 card->rawcell++;
1160                         }
1161                 }
1162         }
1163 
1164         /* Small buffer queue is empty */
1165         if (stat_r & NS_STAT_SFBQE) {
1166                 int i;
1167                 struct sk_buff *sb;
1168 
1169                 writel(NS_STAT_SFBQE, card->membase + STAT);
1170                 printk("nicstar%d: Small free buffer queue empty.\n",
1171                        card->index);
1172                 for (i = 0; i < card->sbnr.min; i++) {
1173                         sb = dev_alloc_skb(NS_SMSKBSIZE);
1174                         if (sb == NULL) {
1175                                 writel(readl(card->membase + CFG) &
1176                                        ~NS_CFG_EFBIE, card->membase + CFG);
1177                                 card->efbie = 0;
1178                                 break;
1179                         }
1180                         NS_PRV_BUFTYPE(sb) = BUF_SM;
1181                         skb_queue_tail(&card->sbpool.queue, sb);
1182                         skb_reserve(sb, NS_AAL0_HEADER);
1183                         push_rxbufs(card, sb);
1184                 }
1185                 card->sbfqc = i;
1186                 process_rsq(card);
1187         }
1188 
1189         /* Large buffer queue empty */
1190         if (stat_r & NS_STAT_LFBQE) {
1191                 int i;
1192                 struct sk_buff *lb;
1193 
1194                 writel(NS_STAT_LFBQE, card->membase + STAT);
1195                 printk("nicstar%d: Large free buffer queue empty.\n",
1196                        card->index);
1197                 for (i = 0; i < card->lbnr.min; i++) {
1198                         lb = dev_alloc_skb(NS_LGSKBSIZE);
1199                         if (lb == NULL) {
1200                                 writel(readl(card->membase + CFG) &
1201                                        ~NS_CFG_EFBIE, card->membase + CFG);
1202                                 card->efbie = 0;
1203                                 break;
1204                         }
1205                         NS_PRV_BUFTYPE(lb) = BUF_LG;
1206                         skb_queue_tail(&card->lbpool.queue, lb);
1207                         skb_reserve(lb, NS_SMBUFSIZE);
1208                         push_rxbufs(card, lb);
1209                 }
1210                 card->lbfqc = i;
1211                 process_rsq(card);
1212         }
1213 
1214         /* Receive Status Queue is 7/8 full */
1215         if (stat_r & NS_STAT_RSQAF) {
1216                 writel(NS_STAT_RSQAF, card->membase + STAT);
1217                 RXPRINTK("nicstar%d: RSQ almost full.\n", card->index);
1218                 process_rsq(card);
1219         }
1220 
1221         spin_unlock_irqrestore(&card->int_lock, flags);
1222         PRINTK("nicstar%d: end of interrupt service\n", card->index);
1223         return IRQ_HANDLED;
1224 }
1225 
1226 static int ns_open(struct atm_vcc *vcc)
1227 {
1228         ns_dev *card;
1229         vc_map *vc;
1230         unsigned long tmpl, modl;
1231         int tcr, tcra;          /* target cell rate, and absolute value */
1232         int n = 0;              /* Number of entries in the TST. Initialized to remove
1233                                    the compiler warning. */
1234         u32 u32d[4];
1235         int frscdi = 0;         /* Index of the SCD. Initialized to remove the compiler
1236                                    warning. How I wish compilers were clever enough to
1237                                    tell which variables can truly be used
1238                                    uninitialized... */
1239         int inuse;              /* tx or rx vc already in use by another vcc */
1240         short vpi = vcc->vpi;
1241         int vci = vcc->vci;
1242 
1243         card = (ns_dev *) vcc->dev->dev_data;
1244         PRINTK("nicstar%d: opening vpi.vci %d.%d \n", card->index, (int)vpi,
1245                vci);
1246         if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0) {
1247                 PRINTK("nicstar%d: unsupported AAL.\n", card->index);
1248                 return -EINVAL;
1249         }
1250 
1251         vc = &(card->vcmap[vpi << card->vcibits | vci]);
1252         vcc->dev_data = vc;
1253 
1254         inuse = 0;
1255         if (vcc->qos.txtp.traffic_class != ATM_NONE && vc->tx)
1256                 inuse = 1;
1257         if (vcc->qos.rxtp.traffic_class != ATM_NONE && vc->rx)
1258                 inuse += 2;
1259         if (inuse) {
1260                 printk("nicstar%d: %s vci already in use.\n", card->index,
1261                        inuse == 1 ? "tx" : inuse == 2 ? "rx" : "tx and rx");
1262                 return -EINVAL;
1263         }
1264 
1265         set_bit(ATM_VF_ADDR, &vcc->flags);
1266 
1267         /* NOTE: You are not allowed to modify an open connection's QOS. To change
1268            that, remove the ATM_VF_PARTIAL flag checking. There may be other changes
1269            needed to do that. */
1270         if (!test_bit(ATM_VF_PARTIAL, &vcc->flags)) {
1271                 scq_info *scq;
1272 
1273                 set_bit(ATM_VF_PARTIAL, &vcc->flags);
1274                 if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1275                         /* Check requested cell rate and availability of SCD */
1276                         if (vcc->qos.txtp.max_pcr == 0 && vcc->qos.txtp.pcr == 0
1277                             && vcc->qos.txtp.min_pcr == 0) {
1278                                 PRINTK
1279                                     ("nicstar%d: trying to open a CBR vc with cell rate = 0 \n",
1280                                      card->index);
1281                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1282                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1283                                 return -EINVAL;
1284                         }
1285 
1286                         tcr = atm_pcr_goal(&(vcc->qos.txtp));
1287                         tcra = tcr >= 0 ? tcr : -tcr;
1288 
1289                         PRINTK("nicstar%d: target cell rate = %d.\n",
1290                                card->index, vcc->qos.txtp.max_pcr);
1291 
1292                         tmpl =
1293                             (unsigned long)tcra *(unsigned long)
1294                             NS_TST_NUM_ENTRIES;
1295                         modl = tmpl % card->max_pcr;
1296 
1297                         n = (int)(tmpl / card->max_pcr);
1298                         if (tcr > 0) {
1299                                 if (modl > 0)
1300                                         n++;
1301                         } else if (tcr == 0) {
1302                                 if ((n =
1303                                      (card->tst_free_entries -
1304                                       NS_TST_RESERVED)) <= 0) {
1305                                         PRINTK
1306                                             ("nicstar%d: no CBR bandwidth free.\n",
1307                                              card->index);
1308                                         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1309                                         clear_bit(ATM_VF_ADDR, &vcc->flags);
1310                                         return -EINVAL;
1311                                 }
1312                         }
1313 
1314                         if (n == 0) {
1315                                 printk
1316                                     ("nicstar%d: selected bandwidth < granularity.\n",
1317                                      card->index);
1318                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1319                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1320                                 return -EINVAL;
1321                         }
1322 
1323                         if (n > (card->tst_free_entries - NS_TST_RESERVED)) {
1324                                 PRINTK
1325                                     ("nicstar%d: not enough free CBR bandwidth.\n",
1326                                      card->index);
1327                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1328                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1329                                 return -EINVAL;
1330                         } else
1331                                 card->tst_free_entries -= n;
1332 
1333                         XPRINTK("nicstar%d: writing %d tst entries.\n",
1334                                 card->index, n);
1335                         for (frscdi = 0; frscdi < NS_FRSCD_NUM; frscdi++) {
1336                                 if (card->scd2vc[frscdi] == NULL) {
1337                                         card->scd2vc[frscdi] = vc;
1338                                         break;
1339                                 }
1340                         }
1341                         if (frscdi == NS_FRSCD_NUM) {
1342                                 PRINTK
1343                                     ("nicstar%d: no SCD available for CBR channel.\n",
1344                                      card->index);
1345                                 card->tst_free_entries += n;
1346                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1347                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1348                                 return -EBUSY;
1349                         }
1350 
1351                         vc->cbr_scd = NS_FRSCD + frscdi * NS_FRSCD_SIZE;
1352 
1353                         scq = get_scq(card, CBR_SCQSIZE, vc->cbr_scd);
1354                         if (scq == NULL) {
1355                                 PRINTK("nicstar%d: can't get fixed rate SCQ.\n",
1356                                        card->index);
1357                                 card->scd2vc[frscdi] = NULL;
1358                                 card->tst_free_entries += n;
1359                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1360                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1361                                 return -ENOMEM;
1362                         }
1363                         vc->scq = scq;
1364                         u32d[0] = scq_virt_to_bus(scq, scq->base);
1365                         u32d[1] = (u32) 0x00000000;
1366                         u32d[2] = (u32) 0xffffffff;
1367                         u32d[3] = (u32) 0x00000000;
1368                         ns_write_sram(card, vc->cbr_scd, u32d, 4);
1369 
1370                         fill_tst(card, n, vc);
1371                 } else if (vcc->qos.txtp.traffic_class == ATM_UBR) {
1372                         vc->cbr_scd = 0x00000000;
1373                         vc->scq = card->scq0;
1374                 }
1375 
1376                 if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1377                         vc->tx = 1;
1378                         vc->tx_vcc = vcc;
1379                         vc->tbd_count = 0;
1380                 }
1381                 if (vcc->qos.rxtp.traffic_class != ATM_NONE) {
1382                         u32 status;
1383 
1384                         vc->rx = 1;
1385                         vc->rx_vcc = vcc;
1386                         vc->rx_iov = NULL;
1387 
1388                         /* Open the connection in hardware */
1389                         if (vcc->qos.aal == ATM_AAL5)
1390                                 status = NS_RCTE_AAL5 | NS_RCTE_CONNECTOPEN;
1391                         else    /* vcc->qos.aal == ATM_AAL0 */
1392                                 status = NS_RCTE_AAL0 | NS_RCTE_CONNECTOPEN;
1393 #ifdef RCQ_SUPPORT
1394                         status |= NS_RCTE_RAWCELLINTEN;
1395 #endif /* RCQ_SUPPORT */
1396                         ns_write_sram(card,
1397                                       NS_RCT +
1398                                       (vpi << card->vcibits | vci) *
1399                                       NS_RCT_ENTRY_SIZE, &status, 1);
1400                 }
1401 
1402         }
1403 
1404         set_bit(ATM_VF_READY, &vcc->flags);
1405         return 0;
1406 }
1407 
1408 static void ns_close(struct atm_vcc *vcc)
1409 {
1410         vc_map *vc;
1411         ns_dev *card;
1412         u32 data;
1413         int i;
1414 
1415         vc = vcc->dev_data;
1416         card = vcc->dev->dev_data;
1417         PRINTK("nicstar%d: closing vpi.vci %d.%d \n", card->index,
1418                (int)vcc->vpi, vcc->vci);
1419 
1420         clear_bit(ATM_VF_READY, &vcc->flags);
1421 
1422         if (vcc->qos.rxtp.traffic_class != ATM_NONE) {
1423                 u32 addr;
1424                 unsigned long flags;
1425 
1426                 addr =
1427                     NS_RCT +
1428                     (vcc->vpi << card->vcibits | vcc->vci) * NS_RCT_ENTRY_SIZE;
1429                 spin_lock_irqsave(&card->res_lock, flags);
1430                 while (CMD_BUSY(card)) ;
1431                 writel(NS_CMD_CLOSE_CONNECTION | addr << 2,
1432                        card->membase + CMD);
1433                 spin_unlock_irqrestore(&card->res_lock, flags);
1434 
1435                 vc->rx = 0;
1436                 if (vc->rx_iov != NULL) {
1437                         struct sk_buff *iovb;
1438                         u32 stat;
1439 
1440                         stat = readl(card->membase + STAT);
1441                         card->sbfqc = ns_stat_sfbqc_get(stat);
1442                         card->lbfqc = ns_stat_lfbqc_get(stat);
1443 
1444                         PRINTK
1445                             ("nicstar%d: closing a VC with pending rx buffers.\n",
1446                              card->index);
1447                         iovb = vc->rx_iov;
1448                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
1449                                               NS_PRV_IOVCNT(iovb));
1450                         NS_PRV_IOVCNT(iovb) = 0;
1451                         spin_lock_irqsave(&card->int_lock, flags);
1452                         recycle_iov_buf(card, iovb);
1453                         spin_unlock_irqrestore(&card->int_lock, flags);
1454                         vc->rx_iov = NULL;
1455                 }
1456         }
1457 
1458         if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1459                 vc->tx = 0;
1460         }
1461 
1462         if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1463                 unsigned long flags;
1464                 ns_scqe *scqep;
1465                 scq_info *scq;
1466 
1467                 scq = vc->scq;
1468 
1469                 for (;;) {
1470                         spin_lock_irqsave(&scq->lock, flags);
1471                         scqep = scq->next;
1472                         if (scqep == scq->base)
1473                                 scqep = scq->last;
1474                         else
1475                                 scqep--;
1476                         if (scqep == scq->tail) {
1477                                 spin_unlock_irqrestore(&scq->lock, flags);
1478                                 break;
1479                         }
1480                         /* If the last entry is not a TSR, place one in the SCQ in order to
1481                            be able to completely drain it and then close. */
1482                         if (!ns_scqe_is_tsr(scqep) && scq->tail != scq->next) {
1483                                 ns_scqe tsr;
1484                                 u32 scdi, scqi;
1485                                 u32 data;
1486                                 int index;
1487 
1488                                 tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
1489                                 scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
1490                                 scqi = scq->next - scq->base;
1491                                 tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
1492                                 tsr.word_3 = 0x00000000;
1493                                 tsr.word_4 = 0x00000000;
1494                                 *scq->next = tsr;
1495                                 index = (int)scqi;
1496                                 scq->skb[index] = NULL;
1497                                 if (scq->next == scq->last)
1498                                         scq->next = scq->base;
1499                                 else
1500                                         scq->next++;
1501                                 data = scq_virt_to_bus(scq, scq->next);
1502                                 ns_write_sram(card, scq->scd, &data, 1);
1503                         }
1504                         spin_unlock_irqrestore(&scq->lock, flags);
1505                         schedule();
1506                 }
1507 
1508                 /* Free all TST entries */
1509                 data = NS_TST_OPCODE_VARIABLE;
1510                 for (i = 0; i < NS_TST_NUM_ENTRIES; i++) {
1511                         if (card->tste2vc[i] == vc) {
1512                                 ns_write_sram(card, card->tst_addr + i, &data,
1513                                               1);
1514                                 card->tste2vc[i] = NULL;
1515                                 card->tst_free_entries++;
1516                         }
1517                 }
1518 
1519                 card->scd2vc[(vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE] = NULL;
1520                 free_scq(card, vc->scq, vcc);
1521         }
1522 
1523         /* remove all references to vcc before deleting it */
1524         if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1525                 unsigned long flags;
1526                 scq_info *scq = card->scq0;
1527 
1528                 spin_lock_irqsave(&scq->lock, flags);
1529 
1530                 for (i = 0; i < scq->num_entries; i++) {
1531                         if (scq->skb[i] && ATM_SKB(scq->skb[i])->vcc == vcc) {
1532                                 ATM_SKB(scq->skb[i])->vcc = NULL;
1533                                 atm_return(vcc, scq->skb[i]->truesize);
1534                                 PRINTK
1535                                     ("nicstar: deleted pending vcc mapping\n");
1536                         }
1537                 }
1538 
1539                 spin_unlock_irqrestore(&scq->lock, flags);
1540         }
1541 
1542         vcc->dev_data = NULL;
1543         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1544         clear_bit(ATM_VF_ADDR, &vcc->flags);
1545 
1546 #ifdef RX_DEBUG
1547         {
1548                 u32 stat, cfg;
1549                 stat = readl(card->membase + STAT);
1550                 cfg = readl(card->membase + CFG);
1551                 printk("STAT = 0x%08X  CFG = 0x%08X  \n", stat, cfg);
1552                 printk
1553                     ("TSQ: base = 0x%p  next = 0x%p  last = 0x%p  TSQT = 0x%08X \n",
1554                      card->tsq.base, card->tsq.next,
1555                      card->tsq.last, readl(card->membase + TSQT));
1556                 printk
1557                     ("RSQ: base = 0x%p  next = 0x%p  last = 0x%p  RSQT = 0x%08X \n",
1558                      card->rsq.base, card->rsq.next,
1559                      card->rsq.last, readl(card->membase + RSQT));
1560                 printk("Empty free buffer queue interrupt %s \n",
1561                        card->efbie ? "enabled" : "disabled");
1562                 printk("SBCNT = %d  count = %d   LBCNT = %d count = %d \n",
1563                        ns_stat_sfbqc_get(stat), card->sbpool.count,
1564                        ns_stat_lfbqc_get(stat), card->lbpool.count);
1565                 printk("hbpool.count = %d  iovpool.count = %d \n",
1566                        card->hbpool.count, card->iovpool.count);
1567         }
1568 #endif /* RX_DEBUG */
1569 }
1570 
1571 static void fill_tst(ns_dev * card, int n, vc_map * vc)
1572 {
1573         u32 new_tst;
1574         unsigned long cl;
1575         int e, r;
1576         u32 data;
1577 
1578         /* It would be very complicated to keep the two TSTs synchronized while
1579            assuring that writes are only made to the inactive TST. So, for now I
1580            will use only one TST. If problems occur, I will change this again */
1581 
1582         new_tst = card->tst_addr;
1583 
1584         /* Fill procedure */
1585 
1586         for (e = 0; e < NS_TST_NUM_ENTRIES; e++) {
1587                 if (card->tste2vc[e] == NULL)
1588                         break;
1589         }
1590         if (e == NS_TST_NUM_ENTRIES) {
1591                 printk("nicstar%d: No free TST entries found. \n", card->index);
1592                 return;
1593         }
1594 
1595         r = n;
1596         cl = NS_TST_NUM_ENTRIES;
1597         data = ns_tste_make(NS_TST_OPCODE_FIXED, vc->cbr_scd);
1598 
1599         while (r > 0) {
1600                 if (cl >= NS_TST_NUM_ENTRIES && card->tste2vc[e] == NULL) {
1601                         card->tste2vc[e] = vc;
1602                         ns_write_sram(card, new_tst + e, &data, 1);
1603                         cl -= NS_TST_NUM_ENTRIES;
1604                         r--;
1605                 }
1606 
1607                 if (++e == NS_TST_NUM_ENTRIES) {
1608                         e = 0;
1609                 }
1610                 cl += n;
1611         }
1612 
1613         /* End of fill procedure */
1614 
1615         data = ns_tste_make(NS_TST_OPCODE_END, new_tst);
1616         ns_write_sram(card, new_tst + NS_TST_NUM_ENTRIES, &data, 1);
1617         ns_write_sram(card, card->tst_addr + NS_TST_NUM_ENTRIES, &data, 1);
1618         card->tst_addr = new_tst;
1619 }
1620 
1621 static int ns_send(struct atm_vcc *vcc, struct sk_buff *skb)
1622 {
1623         ns_dev *card;
1624         vc_map *vc;
1625         scq_info *scq;
1626         unsigned long buflen;
1627         ns_scqe scqe;
1628         u32 flags;              /* TBD flags, not CPU flags */
1629 
1630         card = vcc->dev->dev_data;
1631         TXPRINTK("nicstar%d: ns_send() called.\n", card->index);
1632         if ((vc = (vc_map *) vcc->dev_data) == NULL) {
1633                 printk("nicstar%d: vcc->dev_data == NULL on ns_send().\n",
1634                        card->index);
1635                 atomic_inc(&vcc->stats->tx_err);
1636                 dev_kfree_skb_any(skb);
1637                 return -EINVAL;
1638         }
1639 
1640         if (!vc->tx) {
1641                 printk("nicstar%d: Trying to transmit on a non-tx VC.\n",
1642                        card->index);
1643                 atomic_inc(&vcc->stats->tx_err);
1644                 dev_kfree_skb_any(skb);
1645                 return -EINVAL;
1646         }
1647 
1648         if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0) {
1649                 printk("nicstar%d: Only AAL0 and AAL5 are supported.\n",
1650                        card->index);
1651                 atomic_inc(&vcc->stats->tx_err);
1652                 dev_kfree_skb_any(skb);
1653                 return -EINVAL;
1654         }
1655 
1656         if (skb_shinfo(skb)->nr_frags != 0) {
1657                 printk("nicstar%d: No scatter-gather yet.\n", card->index);
1658                 atomic_inc(&vcc->stats->tx_err);
1659                 dev_kfree_skb_any(skb);
1660                 return -EINVAL;
1661         }
1662 
1663         ATM_SKB(skb)->vcc = vcc;
1664 
1665         NS_PRV_DMA(skb) = dma_map_single(&card->pcidev->dev, skb->data,
1666                                          skb->len, DMA_TO_DEVICE);
1667 
1668         if (vcc->qos.aal == ATM_AAL5) {
1669                 buflen = (skb->len + 47 + 8) / 48 * 48; /* Multiple of 48 */
1670                 flags = NS_TBD_AAL5;
1671                 scqe.word_2 = cpu_to_le32(NS_PRV_DMA(skb));
1672                 scqe.word_3 = cpu_to_le32(skb->len);
1673                 scqe.word_4 =
1674                     ns_tbd_mkword_4(0, (u32) vcc->vpi, (u32) vcc->vci, 0,
1675                                     ATM_SKB(skb)->
1676                                     atm_options & ATM_ATMOPT_CLP ? 1 : 0);
1677                 flags |= NS_TBD_EOPDU;
1678         } else {                /* (vcc->qos.aal == ATM_AAL0) */
1679 
1680                 buflen = ATM_CELL_PAYLOAD;      /* i.e., 48 bytes */
1681                 flags = NS_TBD_AAL0;
1682                 scqe.word_2 = cpu_to_le32(NS_PRV_DMA(skb) + NS_AAL0_HEADER);
1683                 scqe.word_3 = cpu_to_le32(0x00000000);
1684                 if (*skb->data & 0x02)  /* Payload type 1 - end of pdu */
1685                         flags |= NS_TBD_EOPDU;
1686                 scqe.word_4 =
1687                     cpu_to_le32(*((u32 *) skb->data) & ~NS_TBD_VC_MASK);
1688                 /* Force the VPI/VCI to be the same as in VCC struct */
1689                 scqe.word_4 |=
1690                     cpu_to_le32((((u32) vcc->
1691                                   vpi) << NS_TBD_VPI_SHIFT | ((u32) vcc->
1692                                                               vci) <<
1693                                  NS_TBD_VCI_SHIFT) & NS_TBD_VC_MASK);
1694         }
1695 
1696         if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1697                 scqe.word_1 = ns_tbd_mkword_1_novbr(flags, (u32) buflen);
1698                 scq = ((vc_map *) vcc->dev_data)->scq;
1699         } else {
1700                 scqe.word_1 =
1701                     ns_tbd_mkword_1(flags, (u32) 1, (u32) 1, (u32) buflen);
1702                 scq = card->scq0;
1703         }
1704 
1705         if (push_scqe(card, vc, scq, &scqe, skb) != 0) {
1706                 atomic_inc(&vcc->stats->tx_err);
1707                 dev_kfree_skb_any(skb);
1708                 return -EIO;
1709         }
1710         atomic_inc(&vcc->stats->tx);
1711 
1712         return 0;
1713 }
1714 
1715 static int push_scqe(ns_dev * card, vc_map * vc, scq_info * scq, ns_scqe * tbd,
1716                      struct sk_buff *skb)
1717 {
1718         unsigned long flags;
1719         ns_scqe tsr;
1720         u32 scdi, scqi;
1721         int scq_is_vbr;
1722         u32 data;
1723         int index;
1724 
1725         spin_lock_irqsave(&scq->lock, flags);
1726         while (scq->tail == scq->next) {
1727                 if (in_interrupt()) {
1728                         spin_unlock_irqrestore(&scq->lock, flags);
1729                         printk("nicstar%d: Error pushing TBD.\n", card->index);
1730                         return 1;
1731                 }
1732 
1733                 scq->full = 1;
1734                 wait_event_interruptible_lock_irq_timeout(scq->scqfull_waitq,
1735                                                           scq->tail != scq->next,
1736                                                           scq->lock,
1737                                                           SCQFULL_TIMEOUT);
1738 
1739                 if (scq->full) {
1740                         spin_unlock_irqrestore(&scq->lock, flags);
1741                         printk("nicstar%d: Timeout pushing TBD.\n",
1742                                card->index);
1743                         return 1;
1744                 }
1745         }
1746         *scq->next = *tbd;
1747         index = (int)(scq->next - scq->base);
1748         scq->skb[index] = skb;
1749         XPRINTK("nicstar%d: sending skb at 0x%p (pos %d).\n",
1750                 card->index, skb, index);
1751         XPRINTK("nicstar%d: TBD written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%p.\n",
1752                 card->index, le32_to_cpu(tbd->word_1), le32_to_cpu(tbd->word_2),
1753                 le32_to_cpu(tbd->word_3), le32_to_cpu(tbd->word_4),
1754                 scq->next);
1755         if (scq->next == scq->last)
1756                 scq->next = scq->base;
1757         else
1758                 scq->next++;
1759 
1760         vc->tbd_count++;
1761         if (scq->num_entries == VBR_SCQ_NUM_ENTRIES) {
1762                 scq->tbd_count++;
1763                 scq_is_vbr = 1;
1764         } else
1765                 scq_is_vbr = 0;
1766 
1767         if (vc->tbd_count >= MAX_TBD_PER_VC
1768             || scq->tbd_count >= MAX_TBD_PER_SCQ) {
1769                 int has_run = 0;
1770 
1771                 while (scq->tail == scq->next) {
1772                         if (in_interrupt()) {
1773                                 data = scq_virt_to_bus(scq, scq->next);
1774                                 ns_write_sram(card, scq->scd, &data, 1);
1775                                 spin_unlock_irqrestore(&scq->lock, flags);
1776                                 printk("nicstar%d: Error pushing TSR.\n",
1777                                        card->index);
1778                                 return 0;
1779                         }
1780 
1781                         scq->full = 1;
1782                         if (has_run++)
1783                                 break;
1784                         wait_event_interruptible_lock_irq_timeout(scq->scqfull_waitq,
1785                                                                   scq->tail != scq->next,
1786                                                                   scq->lock,
1787                                                                   SCQFULL_TIMEOUT);
1788                 }
1789 
1790                 if (!scq->full) {
1791                         tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
1792                         if (scq_is_vbr)
1793                                 scdi = NS_TSR_SCDISVBR;
1794                         else
1795                                 scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
1796                         scqi = scq->next - scq->base;
1797                         tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
1798                         tsr.word_3 = 0x00000000;
1799                         tsr.word_4 = 0x00000000;
1800 
1801                         *scq->next = tsr;
1802                         index = (int)scqi;
1803                         scq->skb[index] = NULL;
1804                         XPRINTK
1805                             ("nicstar%d: TSR written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%p.\n",
1806                              card->index, le32_to_cpu(tsr.word_1),
1807                              le32_to_cpu(tsr.word_2), le32_to_cpu(tsr.word_3),
1808                              le32_to_cpu(tsr.word_4), scq->next);
1809                         if (scq->next == scq->last)
1810                                 scq->next = scq->base;
1811                         else
1812                                 scq->next++;
1813                         vc->tbd_count = 0;
1814                         scq->tbd_count = 0;
1815                 } else
1816                         PRINTK("nicstar%d: Timeout pushing TSR.\n",
1817                                card->index);
1818         }
1819         data = scq_virt_to_bus(scq, scq->next);
1820         ns_write_sram(card, scq->scd, &data, 1);
1821 
1822         spin_unlock_irqrestore(&scq->lock, flags);
1823 
1824         return 0;
1825 }
1826 
1827 static void process_tsq(ns_dev * card)
1828 {
1829         u32 scdi;
1830         scq_info *scq;
1831         ns_tsi *previous = NULL, *one_ahead, *two_ahead;
1832         int serviced_entries;   /* flag indicating at least on entry was serviced */
1833 
1834         serviced_entries = 0;
1835 
1836         if (card->tsq.next == card->tsq.last)
1837                 one_ahead = card->tsq.base;
1838         else
1839                 one_ahead = card->tsq.next + 1;
1840 
1841         if (one_ahead == card->tsq.last)
1842                 two_ahead = card->tsq.base;
1843         else
1844                 two_ahead = one_ahead + 1;
1845 
1846         while (!ns_tsi_isempty(card->tsq.next) || !ns_tsi_isempty(one_ahead) ||
1847                !ns_tsi_isempty(two_ahead))
1848                 /* At most two empty, as stated in the 77201 errata */
1849         {
1850                 serviced_entries = 1;
1851 
1852                 /* Skip the one or two possible empty entries */
1853                 while (ns_tsi_isempty(card->tsq.next)) {
1854                         if (card->tsq.next == card->tsq.last)
1855                                 card->tsq.next = card->tsq.base;
1856                         else
1857                                 card->tsq.next++;
1858                 }
1859 
1860                 if (!ns_tsi_tmrof(card->tsq.next)) {
1861                         scdi = ns_tsi_getscdindex(card->tsq.next);
1862                         if (scdi == NS_TSI_SCDISVBR)
1863                                 scq = card->scq0;
1864                         else {
1865                                 if (card->scd2vc[scdi] == NULL) {
1866                                         printk
1867                                             ("nicstar%d: could not find VC from SCD index.\n",
1868                                              card->index);
1869                                         ns_tsi_init(card->tsq.next);
1870                                         return;
1871                                 }
1872                                 scq = card->scd2vc[scdi]->scq;
1873                         }
1874                         drain_scq(card, scq, ns_tsi_getscqpos(card->tsq.next));
1875                         scq->full = 0;
1876                         wake_up_interruptible(&(scq->scqfull_waitq));
1877                 }
1878 
1879                 ns_tsi_init(card->tsq.next);
1880                 previous = card->tsq.next;
1881                 if (card->tsq.next == card->tsq.last)
1882                         card->tsq.next = card->tsq.base;
1883                 else
1884                         card->tsq.next++;
1885 
1886                 if (card->tsq.next == card->tsq.last)
1887                         one_ahead = card->tsq.base;
1888                 else
1889                         one_ahead = card->tsq.next + 1;
1890 
1891                 if (one_ahead == card->tsq.last)
1892                         two_ahead = card->tsq.base;
1893                 else
1894                         two_ahead = one_ahead + 1;
1895         }
1896 
1897         if (serviced_entries)
1898                 writel(PTR_DIFF(previous, card->tsq.base),
1899                        card->membase + TSQH);
1900 }
1901 
1902 static void drain_scq(ns_dev * card, scq_info * scq, int pos)
1903 {
1904         struct atm_vcc *vcc;
1905         struct sk_buff *skb;
1906         int i;
1907         unsigned long flags;
1908 
1909         XPRINTK("nicstar%d: drain_scq() called, scq at 0x%p, pos %d.\n",
1910                 card->index, scq, pos);
1911         if (pos >= scq->num_entries) {
1912                 printk("nicstar%d: Bad index on drain_scq().\n", card->index);
1913                 return;
1914         }
1915 
1916         spin_lock_irqsave(&scq->lock, flags);
1917         i = (int)(scq->tail - scq->base);
1918         if (++i == scq->num_entries)
1919                 i = 0;
1920         while (i != pos) {
1921                 skb = scq->skb[i];
1922                 XPRINTK("nicstar%d: freeing skb at 0x%p (index %d).\n",
1923                         card->index, skb, i);
1924                 if (skb != NULL) {
1925                         dma_unmap_single(&card->pcidev->dev,
1926                                          NS_PRV_DMA(skb),
1927                                          skb->len,
1928                                          DMA_TO_DEVICE);
1929                         vcc = ATM_SKB(skb)->vcc;
1930                         if (vcc && vcc->pop != NULL) {
1931                                 vcc->pop(vcc, skb);
1932                         } else {
1933                                 dev_kfree_skb_irq(skb);
1934                         }
1935                         scq->skb[i] = NULL;
1936                 }
1937                 if (++i == scq->num_entries)
1938                         i = 0;
1939         }
1940         scq->tail = scq->base + pos;
1941         spin_unlock_irqrestore(&scq->lock, flags);
1942 }
1943 
1944 static void process_rsq(ns_dev * card)
1945 {
1946         ns_rsqe *previous;
1947 
1948         if (!ns_rsqe_valid(card->rsq.next))
1949                 return;
1950         do {
1951                 dequeue_rx(card, card->rsq.next);
1952                 ns_rsqe_init(card->rsq.next);
1953                 previous = card->rsq.next;
1954                 if (card->rsq.next == card->rsq.last)
1955                         card->rsq.next = card->rsq.base;
1956                 else
1957                         card->rsq.next++;
1958         } while (ns_rsqe_valid(card->rsq.next));
1959         writel(PTR_DIFF(previous, card->rsq.base), card->membase + RSQH);
1960 }
1961 
1962 static void dequeue_rx(ns_dev * card, ns_rsqe * rsqe)
1963 {
1964         u32 vpi, vci;
1965         vc_map *vc;
1966         struct sk_buff *iovb;
1967         struct iovec *iov;
1968         struct atm_vcc *vcc;
1969         struct sk_buff *skb;
1970         unsigned short aal5_len;
1971         int len;
1972         u32 stat;
1973         u32 id;
1974 
1975         stat = readl(card->membase + STAT);
1976         card->sbfqc = ns_stat_sfbqc_get(stat);
1977         card->lbfqc = ns_stat_lfbqc_get(stat);
1978 
1979         id = le32_to_cpu(rsqe->buffer_handle);
1980         skb = idr_find(&card->idr, id);
1981         if (!skb) {
1982                 RXPRINTK(KERN_ERR
1983                          "nicstar%d: idr_find() failed!\n", card->index);
1984                 return;
1985         }
1986         idr_remove(&card->idr, id);
1987         dma_sync_single_for_cpu(&card->pcidev->dev,
1988                                 NS_PRV_DMA(skb),
1989                                 (NS_PRV_BUFTYPE(skb) == BUF_SM
1990                                  ? NS_SMSKBSIZE : NS_LGSKBSIZE),
1991                                 DMA_FROM_DEVICE);
1992         dma_unmap_single(&card->pcidev->dev,
1993                          NS_PRV_DMA(skb),
1994                          (NS_PRV_BUFTYPE(skb) == BUF_SM
1995                           ? NS_SMSKBSIZE : NS_LGSKBSIZE),
1996                          DMA_FROM_DEVICE);
1997         vpi = ns_rsqe_vpi(rsqe);
1998         vci = ns_rsqe_vci(rsqe);
1999         if (vpi >= 1UL << card->vpibits || vci >= 1UL << card->vcibits) {
2000                 printk("nicstar%d: SDU received for out-of-range vc %d.%d.\n",
2001                        card->index, vpi, vci);
2002                 recycle_rx_buf(card, skb);
2003                 return;
2004         }
2005 
2006         vc = &(card->vcmap[vpi << card->vcibits | vci]);
2007         if (!vc->rx) {
2008                 RXPRINTK("nicstar%d: SDU received on non-rx vc %d.%d.\n",
2009                          card->index, vpi, vci);
2010                 recycle_rx_buf(card, skb);
2011                 return;
2012         }
2013 
2014         vcc = vc->rx_vcc;
2015 
2016         if (vcc->qos.aal == ATM_AAL0) {
2017                 struct sk_buff *sb;
2018                 unsigned char *cell;
2019                 int i;
2020 
2021                 cell = skb->data;
2022                 for (i = ns_rsqe_cellcount(rsqe); i; i--) {
2023                         if ((sb = dev_alloc_skb(NS_SMSKBSIZE)) == NULL) {
2024                                 printk
2025                                     ("nicstar%d: Can't allocate buffers for aal0.\n",
2026                                      card->index);
2027                                 atomic_add(i, &vcc->stats->rx_drop);
2028                                 break;
2029                         }
2030                         if (!atm_charge(vcc, sb->truesize)) {
2031                                 RXPRINTK
2032                                     ("nicstar%d: atm_charge() dropped aal0 packets.\n",
2033                                      card->index);
2034                                 atomic_add(i - 1, &vcc->stats->rx_drop);        /* already increased by 1 */
2035                                 dev_kfree_skb_any(sb);
2036                                 break;
2037                         }
2038                         /* Rebuild the header */
2039                         *((u32 *) sb->data) = le32_to_cpu(rsqe->word_1) << 4 |
2040                             (ns_rsqe_clp(rsqe) ? 0x00000001 : 0x00000000);
2041                         if (i == 1 && ns_rsqe_eopdu(rsqe))
2042                                 *((u32 *) sb->data) |= 0x00000002;
2043                         skb_put(sb, NS_AAL0_HEADER);
2044                         memcpy(skb_tail_pointer(sb), cell, ATM_CELL_PAYLOAD);
2045                         skb_put(sb, ATM_CELL_PAYLOAD);
2046                         ATM_SKB(sb)->vcc = vcc;
2047                         __net_timestamp(sb);
2048                         vcc->push(vcc, sb);
2049                         atomic_inc(&vcc->stats->rx);
2050                         cell += ATM_CELL_PAYLOAD;
2051                 }
2052 
2053                 recycle_rx_buf(card, skb);
2054                 return;
2055         }
2056 
2057         /* To reach this point, the AAL layer can only be AAL5 */
2058 
2059         if ((iovb = vc->rx_iov) == NULL) {
2060                 iovb = skb_dequeue(&(card->iovpool.queue));
2061                 if (iovb == NULL) {     /* No buffers in the queue */
2062                         iovb = alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC);
2063                         if (iovb == NULL) {
2064                                 printk("nicstar%d: Out of iovec buffers.\n",
2065                                        card->index);
2066                                 atomic_inc(&vcc->stats->rx_drop);
2067                                 recycle_rx_buf(card, skb);
2068                                 return;
2069                         }
2070                         NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2071                 } else if (--card->iovpool.count < card->iovnr.min) {
2072                         struct sk_buff *new_iovb;
2073                         if ((new_iovb =
2074                              alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC)) != NULL) {
2075                                 NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2076                                 skb_queue_tail(&card->iovpool.queue, new_iovb);
2077                                 card->iovpool.count++;
2078                         }
2079                 }
2080                 vc->rx_iov = iovb;
2081                 NS_PRV_IOVCNT(iovb) = 0;
2082                 iovb->len = 0;
2083                 iovb->data = iovb->head;
2084                 skb_reset_tail_pointer(iovb);
2085                 /* IMPORTANT: a pointer to the sk_buff containing the small or large
2086                    buffer is stored as iovec base, NOT a pointer to the
2087                    small or large buffer itself. */
2088         } else if (NS_PRV_IOVCNT(iovb) >= NS_MAX_IOVECS) {
2089                 printk("nicstar%d: received too big AAL5 SDU.\n", card->index);
2090                 atomic_inc(&vcc->stats->rx_err);
2091                 recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2092                                       NS_MAX_IOVECS);
2093                 NS_PRV_IOVCNT(iovb) = 0;
2094                 iovb->len = 0;
2095                 iovb->data = iovb->head;
2096                 skb_reset_tail_pointer(iovb);
2097         }
2098         iov = &((struct iovec *)iovb->data)[NS_PRV_IOVCNT(iovb)++];
2099         iov->iov_base = (void *)skb;
2100         iov->iov_len = ns_rsqe_cellcount(rsqe) * 48;
2101         iovb->len += iov->iov_len;
2102 
2103 #ifdef EXTRA_DEBUG
2104         if (NS_PRV_IOVCNT(iovb) == 1) {
2105                 if (NS_PRV_BUFTYPE(skb) != BUF_SM) {
2106                         printk
2107                             ("nicstar%d: Expected a small buffer, and this is not one.\n",
2108                              card->index);
2109                         which_list(card, skb);
2110                         atomic_inc(&vcc->stats->rx_err);
2111                         recycle_rx_buf(card, skb);
2112                         vc->rx_iov = NULL;
2113                         recycle_iov_buf(card, iovb);
2114                         return;
2115                 }
2116         } else {                /* NS_PRV_IOVCNT(iovb) >= 2 */
2117 
2118                 if (NS_PRV_BUFTYPE(skb) != BUF_LG) {
2119                         printk
2120                             ("nicstar%d: Expected a large buffer, and this is not one.\n",
2121                              card->index);
2122                         which_list(card, skb);
2123                         atomic_inc(&vcc->stats->rx_err);
2124                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2125                                               NS_PRV_IOVCNT(iovb));
2126                         vc->rx_iov = NULL;
2127                         recycle_iov_buf(card, iovb);
2128                         return;
2129                 }
2130         }
2131 #endif /* EXTRA_DEBUG */
2132 
2133         if (ns_rsqe_eopdu(rsqe)) {
2134                 /* This works correctly regardless of the endianness of the host */
2135                 unsigned char *L1L2 = (unsigned char *)
2136                                                 (skb->data + iov->iov_len - 6);
2137                 aal5_len = L1L2[0] << 8 | L1L2[1];
2138                 len = (aal5_len == 0x0000) ? 0x10000 : aal5_len;
2139                 if (ns_rsqe_crcerr(rsqe) ||
2140                     len + 8 > iovb->len || len + (47 + 8) < iovb->len) {
2141                         printk("nicstar%d: AAL5 CRC error", card->index);
2142                         if (len + 8 > iovb->len || len + (47 + 8) < iovb->len)
2143                                 printk(" - PDU size mismatch.\n");
2144                         else
2145                                 printk(".\n");
2146                         atomic_inc(&vcc->stats->rx_err);
2147                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2148                                               NS_PRV_IOVCNT(iovb));
2149                         vc->rx_iov = NULL;
2150                         recycle_iov_buf(card, iovb);
2151                         return;
2152                 }
2153 
2154                 /* By this point we (hopefully) have a complete SDU without errors. */
2155 
2156                 if (NS_PRV_IOVCNT(iovb) == 1) { /* Just a small buffer */
2157                         /* skb points to a small buffer */
2158                         if (!atm_charge(vcc, skb->truesize)) {
2159                                 push_rxbufs(card, skb);
2160                                 atomic_inc(&vcc->stats->rx_drop);
2161                         } else {
2162                                 skb_put(skb, len);
2163                                 dequeue_sm_buf(card, skb);
2164                                 ATM_SKB(skb)->vcc = vcc;
2165                                 __net_timestamp(skb);
2166                                 vcc->push(vcc, skb);
2167                                 atomic_inc(&vcc->stats->rx);
2168                         }
2169                 } else if (NS_PRV_IOVCNT(iovb) == 2) {  /* One small plus one large buffer */
2170                         struct sk_buff *sb;
2171 
2172                         sb = (struct sk_buff *)(iov - 1)->iov_base;
2173                         /* skb points to a large buffer */
2174 
2175                         if (len <= NS_SMBUFSIZE) {
2176                                 if (!atm_charge(vcc, sb->truesize)) {
2177                                         push_rxbufs(card, sb);
2178                                         atomic_inc(&vcc->stats->rx_drop);
2179                                 } else {
2180                                         skb_put(sb, len);
2181                                         dequeue_sm_buf(card, sb);
2182                                         ATM_SKB(sb)->vcc = vcc;
2183                                         __net_timestamp(sb);
2184                                         vcc->push(vcc, sb);
2185                                         atomic_inc(&vcc->stats->rx);
2186                                 }
2187 
2188                                 push_rxbufs(card, skb);
2189 
2190                         } else {        /* len > NS_SMBUFSIZE, the usual case */
2191 
2192                                 if (!atm_charge(vcc, skb->truesize)) {
2193                                         push_rxbufs(card, skb);
2194                                         atomic_inc(&vcc->stats->rx_drop);
2195                                 } else {
2196                                         dequeue_lg_buf(card, skb);
2197                                         skb_push(skb, NS_SMBUFSIZE);
2198                                         skb_copy_from_linear_data(sb, skb->data,
2199                                                                   NS_SMBUFSIZE);
2200                                         skb_put(skb, len - NS_SMBUFSIZE);
2201                                         ATM_SKB(skb)->vcc = vcc;
2202                                         __net_timestamp(skb);
2203                                         vcc->push(vcc, skb);
2204                                         atomic_inc(&vcc->stats->rx);
2205                                 }
2206 
2207                                 push_rxbufs(card, sb);
2208 
2209                         }
2210 
2211                 } else {        /* Must push a huge buffer */
2212 
2213                         struct sk_buff *hb, *sb, *lb;
2214                         int remaining, tocopy;
2215                         int j;
2216 
2217                         hb = skb_dequeue(&(card->hbpool.queue));
2218                         if (hb == NULL) {       /* No buffers in the queue */
2219 
2220                                 hb = dev_alloc_skb(NS_HBUFSIZE);
2221                                 if (hb == NULL) {
2222                                         printk
2223                                             ("nicstar%d: Out of huge buffers.\n",
2224                                              card->index);
2225                                         atomic_inc(&vcc->stats->rx_drop);
2226                                         recycle_iovec_rx_bufs(card,
2227                                                               (struct iovec *)
2228                                                               iovb->data,
2229                                                               NS_PRV_IOVCNT(iovb));
2230                                         vc->rx_iov = NULL;
2231                                         recycle_iov_buf(card, iovb);
2232                                         return;
2233                                 } else if (card->hbpool.count < card->hbnr.min) {
2234                                         struct sk_buff *new_hb;
2235                                         if ((new_hb =
2236                                              dev_alloc_skb(NS_HBUFSIZE)) !=
2237                                             NULL) {
2238                                                 skb_queue_tail(&card->hbpool.
2239                                                                queue, new_hb);
2240                                                 card->hbpool.count++;
2241                                         }
2242                                 }
2243                                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
2244                         } else if (--card->hbpool.count < card->hbnr.min) {
2245                                 struct sk_buff *new_hb;
2246                                 if ((new_hb =
2247                                      dev_alloc_skb(NS_HBUFSIZE)) != NULL) {
2248                                         NS_PRV_BUFTYPE(new_hb) = BUF_NONE;
2249                                         skb_queue_tail(&card->hbpool.queue,
2250                                                        new_hb);
2251                                         card->hbpool.count++;
2252                                 }
2253                                 if (card->hbpool.count < card->hbnr.min) {
2254                                         if ((new_hb =
2255                                              dev_alloc_skb(NS_HBUFSIZE)) !=
2256                                             NULL) {
2257                                                 NS_PRV_BUFTYPE(new_hb) =
2258                                                     BUF_NONE;
2259                                                 skb_queue_tail(&card->hbpool.
2260                                                                queue, new_hb);
2261                                                 card->hbpool.count++;
2262                                         }
2263                                 }
2264                         }
2265 
2266                         iov = (struct iovec *)iovb->data;
2267 
2268                         if (!atm_charge(vcc, hb->truesize)) {
2269                                 recycle_iovec_rx_bufs(card, iov,
2270                                                       NS_PRV_IOVCNT(iovb));
2271                                 if (card->hbpool.count < card->hbnr.max) {
2272                                         skb_queue_tail(&card->hbpool.queue, hb);
2273                                         card->hbpool.count++;
2274                                 } else
2275                                         dev_kfree_skb_any(hb);
2276                                 atomic_inc(&vcc->stats->rx_drop);
2277                         } else {
2278                                 /* Copy the small buffer to the huge buffer */
2279                                 sb = (struct sk_buff *)iov->iov_base;
2280                                 skb_copy_from_linear_data(sb, hb->data,
2281                                                           iov->iov_len);
2282                                 skb_put(hb, iov->iov_len);
2283                                 remaining = len - iov->iov_len;
2284                                 iov++;
2285                                 /* Free the small buffer */
2286                                 push_rxbufs(card, sb);
2287 
2288                                 /* Copy all large buffers to the huge buffer and free them */
2289                                 for (j = 1; j < NS_PRV_IOVCNT(iovb); j++) {
2290                                         lb = (struct sk_buff *)iov->iov_base;
2291                                         tocopy =
2292                                             min_t(int, remaining, iov->iov_len);
2293                                         skb_copy_from_linear_data(lb,
2294                                                                   skb_tail_pointer
2295                                                                   (hb), tocopy);
2296                                         skb_put(hb, tocopy);
2297                                         iov++;
2298                                         remaining -= tocopy;
2299                                         push_rxbufs(card, lb);
2300                                 }
2301 #ifdef EXTRA_DEBUG
2302                                 if (remaining != 0 || hb->len != len)
2303                                         printk
2304                                             ("nicstar%d: Huge buffer len mismatch.\n",
2305                                              card->index);
2306 #endif /* EXTRA_DEBUG */
2307                                 ATM_SKB(hb)->vcc = vcc;
2308                                 __net_timestamp(hb);
2309                                 vcc->push(vcc, hb);
2310                                 atomic_inc(&vcc->stats->rx);
2311                         }
2312                 }
2313 
2314                 vc->rx_iov = NULL;
2315                 recycle_iov_buf(card, iovb);
2316         }
2317 
2318 }
2319 
2320 static void recycle_rx_buf(ns_dev * card, struct sk_buff *skb)
2321 {
2322         if (unlikely(NS_PRV_BUFTYPE(skb) == BUF_NONE)) {
2323                 printk("nicstar%d: What kind of rx buffer is this?\n",
2324                        card->index);
2325                 dev_kfree_skb_any(skb);
2326         } else
2327                 push_rxbufs(card, skb);
2328 }
2329 
2330 static void recycle_iovec_rx_bufs(ns_dev * card, struct iovec *iov, int count)
2331 {
2332         while (count-- > 0)
2333                 recycle_rx_buf(card, (struct sk_buff *)(iov++)->iov_base);
2334 }
2335 
2336 static void recycle_iov_buf(ns_dev * card, struct sk_buff *iovb)
2337 {
2338         if (card->iovpool.count < card->iovnr.max) {
2339                 skb_queue_tail(&card->iovpool.queue, iovb);
2340                 card->iovpool.count++;
2341         } else
2342                 dev_kfree_skb_any(iovb);
2343 }
2344 
2345 static void dequeue_sm_buf(ns_dev * card, struct sk_buff *sb)
2346 {
2347         skb_unlink(sb, &card->sbpool.queue);
2348         if (card->sbfqc < card->sbnr.init) {
2349                 struct sk_buff *new_sb;
2350                 if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL) {
2351                         NS_PRV_BUFTYPE(new_sb) = BUF_SM;
2352                         skb_queue_tail(&card->sbpool.queue, new_sb);
2353                         skb_reserve(new_sb, NS_AAL0_HEADER);
2354                         push_rxbufs(card, new_sb);
2355                 }
2356         }
2357         if (card->sbfqc < card->sbnr.init)
2358         {
2359                 struct sk_buff *new_sb;
2360                 if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL) {
2361                         NS_PRV_BUFTYPE(new_sb) = BUF_SM;
2362                         skb_queue_tail(&card->sbpool.queue, new_sb);
2363                         skb_reserve(new_sb, NS_AAL0_HEADER);
2364                         push_rxbufs(card, new_sb);
2365                 }
2366         }
2367 }
2368 
2369 static void dequeue_lg_buf(ns_dev * card, struct sk_buff *lb)
2370 {
2371         skb_unlink(lb, &card->lbpool.queue);
2372         if (card->lbfqc < card->lbnr.init) {
2373                 struct sk_buff *new_lb;
2374                 if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL) {
2375                         NS_PRV_BUFTYPE(new_lb) = BUF_LG;
2376                         skb_queue_tail(&card->lbpool.queue, new_lb);
2377                         skb_reserve(new_lb, NS_SMBUFSIZE);
2378                         push_rxbufs(card, new_lb);
2379                 }
2380         }
2381         if (card->lbfqc < card->lbnr.init)
2382         {
2383                 struct sk_buff *new_lb;
2384                 if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL) {
2385                         NS_PRV_BUFTYPE(new_lb) = BUF_LG;
2386                         skb_queue_tail(&card->lbpool.queue, new_lb);
2387                         skb_reserve(new_lb, NS_SMBUFSIZE);
2388                         push_rxbufs(card, new_lb);
2389                 }
2390         }
2391 }
2392 
2393 static int ns_proc_read(struct atm_dev *dev, loff_t * pos, char *page)
2394 {
2395         u32 stat;
2396         ns_dev *card;
2397         int left;
2398 
2399         left = (int)*pos;
2400         card = (ns_dev *) dev->dev_data;
2401         stat = readl(card->membase + STAT);
2402         if (!left--)
2403                 return sprintf(page, "Pool   count    min   init    max \n");
2404         if (!left--)
2405                 return sprintf(page, "Small  %5d  %5d  %5d  %5d \n",
2406                                ns_stat_sfbqc_get(stat), card->sbnr.min,
2407                                card->sbnr.init, card->sbnr.max);
2408         if (!left--)
2409                 return sprintf(page, "Large  %5d  %5d  %5d  %5d \n",
2410                                ns_stat_lfbqc_get(stat), card->lbnr.min,
2411                                card->lbnr.init, card->lbnr.max);
2412         if (!left--)
2413                 return sprintf(page, "Huge   %5d  %5d  %5d  %5d \n",
2414                                card->hbpool.count, card->hbnr.min,
2415                                card->hbnr.init, card->hbnr.max);
2416         if (!left--)
2417                 return sprintf(page, "Iovec  %5d  %5d  %5d  %5d \n",
2418                                card->iovpool.count, card->iovnr.min,
2419                                card->iovnr.init, card->iovnr.max);
2420         if (!left--) {
2421                 int retval;
2422                 retval =
2423                     sprintf(page, "Interrupt counter: %u \n", card->intcnt);
2424                 card->intcnt = 0;
2425                 return retval;
2426         }
2427 #if 0
2428         /* Dump 25.6 Mbps PHY registers */
2429         /* Now there's a 25.6 Mbps PHY driver this code isn't needed. I left it
2430            here just in case it's needed for debugging. */
2431         if (card->max_pcr == ATM_25_PCR && !left--) {
2432                 u32 phy_regs[4];
2433                 u32 i;
2434 
2435                 for (i = 0; i < 4; i++) {
2436                         while (CMD_BUSY(card)) ;
2437                         writel(NS_CMD_READ_UTILITY | 0x00000200 | i,
2438                                card->membase + CMD);
2439                         while (CMD_BUSY(card)) ;
2440                         phy_regs[i] = readl(card->membase + DR0) & 0x000000FF;
2441                 }
2442 
2443                 return sprintf(page, "PHY regs: 0x%02X 0x%02X 0x%02X 0x%02X \n",
2444                                phy_regs[0], phy_regs[1], phy_regs[2],
2445                                phy_regs[3]);
2446         }
2447 #endif /* 0 - Dump 25.6 Mbps PHY registers */
2448 #if 0
2449         /* Dump TST */
2450         if (left-- < NS_TST_NUM_ENTRIES) {
2451                 if (card->tste2vc[left + 1] == NULL)
2452                         return sprintf(page, "%5d - VBR/UBR \n", left + 1);
2453                 else
2454                         return sprintf(page, "%5d - %d %d \n", left + 1,
2455                                        card->tste2vc[left + 1]->tx_vcc->vpi,
2456                                        card->tste2vc[left + 1]->tx_vcc->vci);
2457         }
2458 #endif /* 0 */
2459         return 0;
2460 }
2461 
2462 static int ns_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg)
2463 {
2464         ns_dev *card;
2465         pool_levels pl;
2466         long btype;
2467         unsigned long flags;
2468 
2469         card = dev->dev_data;
2470         switch (cmd) {
2471         case NS_GETPSTAT:
2472                 if (get_user
2473                     (pl.buftype, &((pool_levels __user *) arg)->buftype))
2474                         return -EFAULT;
2475                 switch (pl.buftype) {
2476                 case NS_BUFTYPE_SMALL:
2477                         pl.count =
2478                             ns_stat_sfbqc_get(readl(card->membase + STAT));
2479                         pl.level.min = card->sbnr.min;
2480                         pl.level.init = card->sbnr.init;
2481                         pl.level.max = card->sbnr.max;
2482                         break;
2483 
2484                 case NS_BUFTYPE_LARGE:
2485                         pl.count =
2486                             ns_stat_lfbqc_get(readl(card->membase + STAT));
2487                         pl.level.min = card->lbnr.min;
2488                         pl.level.init = card->lbnr.init;
2489                         pl.level.max = card->lbnr.max;
2490                         break;
2491 
2492                 case NS_BUFTYPE_HUGE:
2493                         pl.count = card->hbpool.count;
2494                         pl.level.min = card->hbnr.min;
2495                         pl.level.init = card->hbnr.init;
2496                         pl.level.max = card->hbnr.max;
2497                         break;
2498 
2499                 case NS_BUFTYPE_IOVEC:
2500                         pl.count = card->iovpool.count;
2501                         pl.level.min = card->iovnr.min;
2502                         pl.level.init = card->iovnr.init;
2503                         pl.level.max = card->iovnr.max;
2504                         break;
2505 
2506                 default:
2507                         return -ENOIOCTLCMD;
2508 
2509                 }
2510                 if (!copy_to_user((pool_levels __user *) arg, &pl, sizeof(pl)))
2511                         return (sizeof(pl));
2512                 else
2513                         return -EFAULT;
2514 
2515         case NS_SETBUFLEV:
2516                 if (!capable(CAP_NET_ADMIN))
2517                         return -EPERM;
2518                 if (copy_from_user(&pl, (pool_levels __user *) arg, sizeof(pl)))
2519                         return -EFAULT;
2520                 if (pl.level.min >= pl.level.init
2521                     || pl.level.init >= pl.level.max)
2522                         return -EINVAL;
2523                 if (pl.level.min == 0)
2524                         return -EINVAL;
2525                 switch (pl.buftype) {
2526                 case NS_BUFTYPE_SMALL:
2527                         if (pl.level.max > TOP_SB)
2528                                 return -EINVAL;
2529                         card->sbnr.min = pl.level.min;
2530                         card->sbnr.init = pl.level.init;
2531                         card->sbnr.max = pl.level.max;
2532                         break;
2533 
2534                 case NS_BUFTYPE_LARGE:
2535                         if (pl.level.max > TOP_LB)
2536                                 return -EINVAL;
2537                         card->lbnr.min = pl.level.min;
2538                         card->lbnr.init = pl.level.init;
2539                         card->lbnr.max = pl.level.max;
2540                         break;
2541 
2542                 case NS_BUFTYPE_HUGE:
2543                         if (pl.level.max > TOP_HB)
2544                                 return -EINVAL;
2545                         card->hbnr.min = pl.level.min;
2546                         card->hbnr.init = pl.level.init;
2547                         card->hbnr.max = pl.level.max;
2548                         break;
2549 
2550                 case NS_BUFTYPE_IOVEC:
2551                         if (pl.level.max > TOP_IOVB)
2552                                 return -EINVAL;
2553                         card->iovnr.min = pl.level.min;
2554                         card->iovnr.init = pl.level.init;
2555                         card->iovnr.max = pl.level.max;
2556                         break;
2557 
2558                 default:
2559                         return -EINVAL;
2560 
2561                 }
2562                 return 0;
2563 
2564         case NS_ADJBUFLEV:
2565                 if (!capable(CAP_NET_ADMIN))
2566                         return -EPERM;
2567                 btype = (long)arg;      /* a long is the same size as a pointer or bigger */
2568                 switch (btype) {
2569                 case NS_BUFTYPE_SMALL:
2570                         while (card->sbfqc < card->sbnr.init) {
2571                                 struct sk_buff *sb;
2572 
2573                                 sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
2574                                 if (sb == NULL)
2575                                         return -ENOMEM;
2576                                 NS_PRV_BUFTYPE(sb) = BUF_SM;
2577                                 skb_queue_tail(&card->sbpool.queue, sb);
2578                                 skb_reserve(sb, NS_AAL0_HEADER);
2579                                 push_rxbufs(card, sb);
2580                         }
2581                         break;
2582 
2583                 case NS_BUFTYPE_LARGE:
2584                         while (card->lbfqc < card->lbnr.init) {
2585                                 struct sk_buff *lb;
2586 
2587                                 lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
2588                                 if (lb == NULL)
2589                                         return -ENOMEM;
2590                                 NS_PRV_BUFTYPE(lb) = BUF_LG;
2591                                 skb_queue_tail(&card->lbpool.queue, lb);
2592                                 skb_reserve(lb, NS_SMBUFSIZE);
2593                                 push_rxbufs(card, lb);
2594                         }
2595                         break;
2596 
2597                 case NS_BUFTYPE_HUGE:
2598                         while (card->hbpool.count > card->hbnr.init) {
2599                                 struct sk_buff *hb;
2600 
2601                                 spin_lock_irqsave(&card->int_lock, flags);
2602                                 hb = skb_dequeue(&card->hbpool.queue);
2603                                 card->hbpool.count--;
2604                                 spin_unlock_irqrestore(&card->int_lock, flags);
2605                                 if (hb == NULL)
2606                                         printk
2607                                             ("nicstar%d: huge buffer count inconsistent.\n",
2608                                              card->index);
2609                                 else
2610                                         dev_kfree_skb_any(hb);
2611 
2612                         }
2613                         while (card->hbpool.count < card->hbnr.init) {
2614                                 struct sk_buff *hb;
2615 
2616                                 hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
2617                                 if (hb == NULL)
2618                                         return -ENOMEM;
2619                                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
2620                                 spin_lock_irqsave(&card->int_lock, flags);
2621                                 skb_queue_tail(&card->hbpool.queue, hb);
2622                                 card->hbpool.count++;
2623                                 spin_unlock_irqrestore(&card->int_lock, flags);
2624                         }
2625                         break;
2626 
2627                 case NS_BUFTYPE_IOVEC:
2628                         while (card->iovpool.count > card->iovnr.init) {
2629                                 struct sk_buff *iovb;
2630 
2631                                 spin_lock_irqsave(&card->int_lock, flags);
2632                                 iovb = skb_dequeue(&card->iovpool.queue);
2633                                 card->iovpool.count--;
2634                                 spin_unlock_irqrestore(&card->int_lock, flags);
2635                                 if (iovb == NULL)
2636                                         printk
2637                                             ("nicstar%d: iovec buffer count inconsistent.\n",
2638                                              card->index);
2639                                 else
2640                                         dev_kfree_skb_any(iovb);
2641 
2642                         }
2643                         while (card->iovpool.count < card->iovnr.init) {
2644                                 struct sk_buff *iovb;
2645 
2646                                 iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
2647                                 if (iovb == NULL)
2648                                         return -ENOMEM;
2649                                 NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2650                                 spin_lock_irqsave(&card->int_lock, flags);
2651                                 skb_queue_tail(&card->iovpool.queue, iovb);
2652                                 card->iovpool.count++;
2653                                 spin_unlock_irqrestore(&card->int_lock, flags);
2654                         }
2655                         break;
2656 
2657                 default:
2658                         return -EINVAL;
2659 
2660                 }
2661                 return 0;
2662 
2663         default:
2664                 if (dev->phy && dev->phy->ioctl) {
2665                         return dev->phy->ioctl(dev, cmd, arg);
2666                 } else {
2667                         printk("nicstar%d: %s == NULL \n", card->index,
2668                                dev->phy ? "dev->phy->ioctl" : "dev->phy");
2669                         return -ENOIOCTLCMD;
2670                 }
2671         }
2672 }
2673 
2674 #ifdef EXTRA_DEBUG
2675 static void which_list(ns_dev * card, struct sk_buff *skb)
2676 {
2677         printk("skb buf_type: 0x%08x\n", NS_PRV_BUFTYPE(skb));
2678 }
2679 #endif /* EXTRA_DEBUG */
2680 
2681 static void ns_poll(unsigned long arg)
2682 {
2683         int i;
2684         ns_dev *card;
2685         unsigned long flags;
2686         u32 stat_r, stat_w;
2687 
2688         PRINTK("nicstar: Entering ns_poll().\n");
2689         for (i = 0; i < num_cards; i++) {
2690                 card = cards[i];
2691                 if (spin_is_locked(&card->int_lock)) {
2692                         /* Probably it isn't worth spinning */
2693                         continue;
2694                 }
2695                 spin_lock_irqsave(&card->int_lock, flags);
2696 
2697                 stat_w = 0;
2698                 stat_r = readl(card->membase + STAT);
2699                 if (stat_r & NS_STAT_TSIF)
2700                         stat_w |= NS_STAT_TSIF;
2701                 if (stat_r & NS_STAT_EOPDU)
2702                         stat_w |= NS_STAT_EOPDU;
2703 
2704                 process_tsq(card);
2705                 process_rsq(card);
2706 
2707                 writel(stat_w, card->membase + STAT);
2708                 spin_unlock_irqrestore(&card->int_lock, flags);
2709         }
2710         mod_timer(&ns_timer, jiffies + NS_POLL_PERIOD);
2711         PRINTK("nicstar: Leaving ns_poll().\n");
2712 }
2713 
2714 static void ns_phy_put(struct atm_dev *dev, unsigned char value,
2715                        unsigned long addr)
2716 {
2717         ns_dev *card;
2718         unsigned long flags;
2719 
2720         card = dev->dev_data;
2721         spin_lock_irqsave(&card->res_lock, flags);
2722         while (CMD_BUSY(card)) ;
2723         writel((u32) value, card->membase + DR0);
2724         writel(NS_CMD_WRITE_UTILITY | 0x00000200 | (addr & 0x000000FF),
2725                card->membase + CMD);
2726         spin_unlock_irqrestore(&card->res_lock, flags);
2727 }
2728 
2729 static unsigned char ns_phy_get(struct atm_dev *dev, unsigned long addr)
2730 {
2731         ns_dev *card;
2732         unsigned long flags;
2733         u32 data;
2734 
2735         card = dev->dev_data;
2736         spin_lock_irqsave(&card->res_lock, flags);
2737         while (CMD_BUSY(card)) ;
2738         writel(NS_CMD_READ_UTILITY | 0x00000200 | (addr & 0x000000FF),
2739                card->membase + CMD);
2740         while (CMD_BUSY(card)) ;
2741         data = readl(card->membase + DR0) & 0x000000FF;
2742         spin_unlock_irqrestore(&card->res_lock, flags);
2743         return (unsigned char)data;
2744 }
2745 
2746 module_init(nicstar_init);
2747 module_exit(nicstar_cleanup);
2748 

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