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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 <linux/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         card = kmalloc(sizeof(*card), GFP_KERNEL);
374         if (!card) {
375                 printk
376                     ("nicstar%d: can't allocate memory for device structure.\n",
377                      i);
378                 error = 2;
379                 ns_init_card_error(card, error);
380                 return error;
381         }
382         cards[i] = card;
383         spin_lock_init(&card->int_lock);
384         spin_lock_init(&card->res_lock);
385 
386         pci_set_drvdata(pcidev, card);
387 
388         card->index = i;
389         card->atmdev = NULL;
390         card->pcidev = pcidev;
391         membase = pci_resource_start(pcidev, 1);
392         card->membase = ioremap(membase, NS_IOREMAP_SIZE);
393         if (!card->membase) {
394                 printk("nicstar%d: can't ioremap() membase.\n", i);
395                 error = 3;
396                 ns_init_card_error(card, error);
397                 return error;
398         }
399         PRINTK("nicstar%d: membase at 0x%p.\n", i, card->membase);
400 
401         pci_set_master(pcidev);
402 
403         if (pci_read_config_byte(pcidev, PCI_LATENCY_TIMER, &pci_latency) != 0) {
404                 printk("nicstar%d: can't read PCI latency timer.\n", i);
405                 error = 6;
406                 ns_init_card_error(card, error);
407                 return error;
408         }
409 #ifdef NS_PCI_LATENCY
410         if (pci_latency < NS_PCI_LATENCY) {
411                 PRINTK("nicstar%d: setting PCI latency timer to %d.\n", i,
412                        NS_PCI_LATENCY);
413                 for (j = 1; j < 4; j++) {
414                         if (pci_write_config_byte
415                             (pcidev, PCI_LATENCY_TIMER, NS_PCI_LATENCY) != 0)
416                                 break;
417                 }
418                 if (j == 4) {
419                         printk
420                             ("nicstar%d: can't set PCI latency timer to %d.\n",
421                              i, NS_PCI_LATENCY);
422                         error = 7;
423                         ns_init_card_error(card, error);
424                         return error;
425                 }
426         }
427 #endif /* NS_PCI_LATENCY */
428 
429         /* Clear timer overflow */
430         data = readl(card->membase + STAT);
431         if (data & NS_STAT_TMROF)
432                 writel(NS_STAT_TMROF, card->membase + STAT);
433 
434         /* Software reset */
435         writel(NS_CFG_SWRST, card->membase + CFG);
436         NS_DELAY;
437         writel(0x00000000, card->membase + CFG);
438 
439         /* PHY reset */
440         writel(0x00000008, card->membase + GP);
441         NS_DELAY;
442         writel(0x00000001, card->membase + GP);
443         NS_DELAY;
444         while (CMD_BUSY(card)) ;
445         writel(NS_CMD_WRITE_UTILITY | 0x00000100, card->membase + CMD); /* Sync UTOPIA with SAR clock */
446         NS_DELAY;
447 
448         /* Detect PHY type */
449         while (CMD_BUSY(card)) ;
450         writel(NS_CMD_READ_UTILITY | 0x00000200, card->membase + CMD);
451         while (CMD_BUSY(card)) ;
452         data = readl(card->membase + DR0);
453         switch (data) {
454         case 0x00000009:
455                 printk("nicstar%d: PHY seems to be 25 Mbps.\n", i);
456                 card->max_pcr = ATM_25_PCR;
457                 while (CMD_BUSY(card)) ;
458                 writel(0x00000008, card->membase + DR0);
459                 writel(NS_CMD_WRITE_UTILITY | 0x00000200, card->membase + CMD);
460                 /* Clear an eventual pending interrupt */
461                 writel(NS_STAT_SFBQF, card->membase + STAT);
462 #ifdef PHY_LOOPBACK
463                 while (CMD_BUSY(card)) ;
464                 writel(0x00000022, card->membase + DR0);
465                 writel(NS_CMD_WRITE_UTILITY | 0x00000202, card->membase + CMD);
466 #endif /* PHY_LOOPBACK */
467                 break;
468         case 0x00000030:
469         case 0x00000031:
470                 printk("nicstar%d: PHY seems to be 155 Mbps.\n", i);
471                 card->max_pcr = ATM_OC3_PCR;
472 #ifdef PHY_LOOPBACK
473                 while (CMD_BUSY(card)) ;
474                 writel(0x00000002, card->membase + DR0);
475                 writel(NS_CMD_WRITE_UTILITY | 0x00000205, card->membase + CMD);
476 #endif /* PHY_LOOPBACK */
477                 break;
478         default:
479                 printk("nicstar%d: unknown PHY type (0x%08X).\n", i, data);
480                 error = 8;
481                 ns_init_card_error(card, error);
482                 return error;
483         }
484         writel(0x00000000, card->membase + GP);
485 
486         /* Determine SRAM size */
487         data = 0x76543210;
488         ns_write_sram(card, 0x1C003, &data, 1);
489         data = 0x89ABCDEF;
490         ns_write_sram(card, 0x14003, &data, 1);
491         if (ns_read_sram(card, 0x14003) == 0x89ABCDEF &&
492             ns_read_sram(card, 0x1C003) == 0x76543210)
493                 card->sram_size = 128;
494         else
495                 card->sram_size = 32;
496         PRINTK("nicstar%d: %dK x 32bit SRAM size.\n", i, card->sram_size);
497 
498         card->rct_size = NS_MAX_RCTSIZE;
499 
500 #if (NS_MAX_RCTSIZE == 4096)
501         if (card->sram_size == 128)
502                 printk
503                     ("nicstar%d: limiting maximum VCI. See NS_MAX_RCTSIZE in nicstar.h\n",
504                      i);
505 #elif (NS_MAX_RCTSIZE == 16384)
506         if (card->sram_size == 32) {
507                 printk
508                     ("nicstar%d: wasting memory. See NS_MAX_RCTSIZE in nicstar.h\n",
509                      i);
510                 card->rct_size = 4096;
511         }
512 #else
513 #error NS_MAX_RCTSIZE must be either 4096 or 16384 in nicstar.c
514 #endif
515 
516         card->vpibits = NS_VPIBITS;
517         if (card->rct_size == 4096)
518                 card->vcibits = 12 - NS_VPIBITS;
519         else                    /* card->rct_size == 16384 */
520                 card->vcibits = 14 - NS_VPIBITS;
521 
522         /* Initialize the nicstar eeprom/eprom stuff, for the MAC addr */
523         if (mac[i] == NULL)
524                 nicstar_init_eprom(card->membase);
525 
526         /* Set the VPI/VCI MSb mask to zero so we can receive OAM cells */
527         writel(0x00000000, card->membase + VPM);
528 
529         /* Initialize TSQ */
530         card->tsq.org = dma_alloc_coherent(&card->pcidev->dev,
531                                            NS_TSQSIZE + NS_TSQ_ALIGNMENT,
532                                            &card->tsq.dma, GFP_KERNEL);
533         if (card->tsq.org == NULL) {
534                 printk("nicstar%d: can't allocate TSQ.\n", i);
535                 error = 10;
536                 ns_init_card_error(card, error);
537                 return error;
538         }
539         card->tsq.base = PTR_ALIGN(card->tsq.org, NS_TSQ_ALIGNMENT);
540         card->tsq.next = card->tsq.base;
541         card->tsq.last = card->tsq.base + (NS_TSQ_NUM_ENTRIES - 1);
542         for (j = 0; j < NS_TSQ_NUM_ENTRIES; j++)
543                 ns_tsi_init(card->tsq.base + j);
544         writel(0x00000000, card->membase + TSQH);
545         writel(ALIGN(card->tsq.dma, NS_TSQ_ALIGNMENT), card->membase + TSQB);
546         PRINTK("nicstar%d: TSQ base at 0x%p.\n", i, card->tsq.base);
547 
548         /* Initialize RSQ */
549         card->rsq.org = dma_alloc_coherent(&card->pcidev->dev,
550                                            NS_RSQSIZE + NS_RSQ_ALIGNMENT,
551                                            &card->rsq.dma, GFP_KERNEL);
552         if (card->rsq.org == NULL) {
553                 printk("nicstar%d: can't allocate RSQ.\n", i);
554                 error = 11;
555                 ns_init_card_error(card, error);
556                 return error;
557         }
558         card->rsq.base = PTR_ALIGN(card->rsq.org, NS_RSQ_ALIGNMENT);
559         card->rsq.next = card->rsq.base;
560         card->rsq.last = card->rsq.base + (NS_RSQ_NUM_ENTRIES - 1);
561         for (j = 0; j < NS_RSQ_NUM_ENTRIES; j++)
562                 ns_rsqe_init(card->rsq.base + j);
563         writel(0x00000000, card->membase + RSQH);
564         writel(ALIGN(card->rsq.dma, NS_RSQ_ALIGNMENT), card->membase + RSQB);
565         PRINTK("nicstar%d: RSQ base at 0x%p.\n", i, card->rsq.base);
566 
567         /* Initialize SCQ0, the only VBR SCQ used */
568         card->scq1 = NULL;
569         card->scq2 = NULL;
570         card->scq0 = get_scq(card, VBR_SCQSIZE, NS_VRSCD0);
571         if (card->scq0 == NULL) {
572                 printk("nicstar%d: can't get SCQ0.\n", i);
573                 error = 12;
574                 ns_init_card_error(card, error);
575                 return error;
576         }
577         u32d[0] = scq_virt_to_bus(card->scq0, card->scq0->base);
578         u32d[1] = (u32) 0x00000000;
579         u32d[2] = (u32) 0xffffffff;
580         u32d[3] = (u32) 0x00000000;
581         ns_write_sram(card, NS_VRSCD0, u32d, 4);
582         ns_write_sram(card, NS_VRSCD1, u32d, 4);        /* These last two won't be used */
583         ns_write_sram(card, NS_VRSCD2, u32d, 4);        /* but are initialized, just in case... */
584         card->scq0->scd = NS_VRSCD0;
585         PRINTK("nicstar%d: VBR-SCQ0 base at 0x%p.\n", i, card->scq0->base);
586 
587         /* Initialize TSTs */
588         card->tst_addr = NS_TST0;
589         card->tst_free_entries = NS_TST_NUM_ENTRIES;
590         data = NS_TST_OPCODE_VARIABLE;
591         for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
592                 ns_write_sram(card, NS_TST0 + j, &data, 1);
593         data = ns_tste_make(NS_TST_OPCODE_END, NS_TST0);
594         ns_write_sram(card, NS_TST0 + NS_TST_NUM_ENTRIES, &data, 1);
595         for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
596                 ns_write_sram(card, NS_TST1 + j, &data, 1);
597         data = ns_tste_make(NS_TST_OPCODE_END, NS_TST1);
598         ns_write_sram(card, NS_TST1 + NS_TST_NUM_ENTRIES, &data, 1);
599         for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
600                 card->tste2vc[j] = NULL;
601         writel(NS_TST0 << 2, card->membase + TSTB);
602 
603         /* Initialize RCT. AAL type is set on opening the VC. */
604 #ifdef RCQ_SUPPORT
605         u32d[0] = NS_RCTE_RAWCELLINTEN;
606 #else
607         u32d[0] = 0x00000000;
608 #endif /* RCQ_SUPPORT */
609         u32d[1] = 0x00000000;
610         u32d[2] = 0x00000000;
611         u32d[3] = 0xFFFFFFFF;
612         for (j = 0; j < card->rct_size; j++)
613                 ns_write_sram(card, j * 4, u32d, 4);
614 
615         memset(card->vcmap, 0, sizeof(card->vcmap));
616 
617         for (j = 0; j < NS_FRSCD_NUM; j++)
618                 card->scd2vc[j] = NULL;
619 
620         /* Initialize buffer levels */
621         card->sbnr.min = MIN_SB;
622         card->sbnr.init = NUM_SB;
623         card->sbnr.max = MAX_SB;
624         card->lbnr.min = MIN_LB;
625         card->lbnr.init = NUM_LB;
626         card->lbnr.max = MAX_LB;
627         card->iovnr.min = MIN_IOVB;
628         card->iovnr.init = NUM_IOVB;
629         card->iovnr.max = MAX_IOVB;
630         card->hbnr.min = MIN_HB;
631         card->hbnr.init = NUM_HB;
632         card->hbnr.max = MAX_HB;
633 
634         card->sm_handle = NULL;
635         card->sm_addr = 0x00000000;
636         card->lg_handle = NULL;
637         card->lg_addr = 0x00000000;
638 
639         card->efbie = 1;        /* To prevent push_rxbufs from enabling the interrupt */
640 
641         idr_init(&card->idr);
642 
643         /* Pre-allocate some huge buffers */
644         skb_queue_head_init(&card->hbpool.queue);
645         card->hbpool.count = 0;
646         for (j = 0; j < NUM_HB; j++) {
647                 struct sk_buff *hb;
648                 hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
649                 if (hb == NULL) {
650                         printk
651                             ("nicstar%d: can't allocate %dth of %d huge buffers.\n",
652                              i, j, NUM_HB);
653                         error = 13;
654                         ns_init_card_error(card, error);
655                         return error;
656                 }
657                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
658                 skb_queue_tail(&card->hbpool.queue, hb);
659                 card->hbpool.count++;
660         }
661 
662         /* Allocate large buffers */
663         skb_queue_head_init(&card->lbpool.queue);
664         card->lbpool.count = 0; /* Not used */
665         for (j = 0; j < NUM_LB; j++) {
666                 struct sk_buff *lb;
667                 lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
668                 if (lb == NULL) {
669                         printk
670                             ("nicstar%d: can't allocate %dth of %d large buffers.\n",
671                              i, j, NUM_LB);
672                         error = 14;
673                         ns_init_card_error(card, error);
674                         return error;
675                 }
676                 NS_PRV_BUFTYPE(lb) = BUF_LG;
677                 skb_queue_tail(&card->lbpool.queue, lb);
678                 skb_reserve(lb, NS_SMBUFSIZE);
679                 push_rxbufs(card, lb);
680                 /* Due to the implementation of push_rxbufs() this is 1, not 0 */
681                 if (j == 1) {
682                         card->rcbuf = lb;
683                         card->rawcell = (struct ns_rcqe *) lb->data;
684                         card->rawch = NS_PRV_DMA(lb);
685                 }
686         }
687         /* Test for strange behaviour which leads to crashes */
688         if ((bcount =
689              ns_stat_lfbqc_get(readl(card->membase + STAT))) < card->lbnr.min) {
690                 printk
691                     ("nicstar%d: Strange... Just allocated %d large buffers and lfbqc = %d.\n",
692                      i, j, bcount);
693                 error = 14;
694                 ns_init_card_error(card, error);
695                 return error;
696         }
697 
698         /* Allocate small buffers */
699         skb_queue_head_init(&card->sbpool.queue);
700         card->sbpool.count = 0; /* Not used */
701         for (j = 0; j < NUM_SB; j++) {
702                 struct sk_buff *sb;
703                 sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
704                 if (sb == NULL) {
705                         printk
706                             ("nicstar%d: can't allocate %dth of %d small buffers.\n",
707                              i, j, NUM_SB);
708                         error = 15;
709                         ns_init_card_error(card, error);
710                         return error;
711                 }
712                 NS_PRV_BUFTYPE(sb) = BUF_SM;
713                 skb_queue_tail(&card->sbpool.queue, sb);
714                 skb_reserve(sb, NS_AAL0_HEADER);
715                 push_rxbufs(card, sb);
716         }
717         /* Test for strange behaviour which leads to crashes */
718         if ((bcount =
719              ns_stat_sfbqc_get(readl(card->membase + STAT))) < card->sbnr.min) {
720                 printk
721                     ("nicstar%d: Strange... Just allocated %d small buffers and sfbqc = %d.\n",
722                      i, j, bcount);
723                 error = 15;
724                 ns_init_card_error(card, error);
725                 return error;
726         }
727 
728         /* Allocate iovec buffers */
729         skb_queue_head_init(&card->iovpool.queue);
730         card->iovpool.count = 0;
731         for (j = 0; j < NUM_IOVB; j++) {
732                 struct sk_buff *iovb;
733                 iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
734                 if (iovb == NULL) {
735                         printk
736                             ("nicstar%d: can't allocate %dth of %d iovec buffers.\n",
737                              i, j, NUM_IOVB);
738                         error = 16;
739                         ns_init_card_error(card, error);
740                         return error;
741                 }
742                 NS_PRV_BUFTYPE(iovb) = BUF_NONE;
743                 skb_queue_tail(&card->iovpool.queue, iovb);
744                 card->iovpool.count++;
745         }
746 
747         /* Configure NICStAR */
748         if (card->rct_size == 4096)
749                 ns_cfg_rctsize = NS_CFG_RCTSIZE_4096_ENTRIES;
750         else                    /* (card->rct_size == 16384) */
751                 ns_cfg_rctsize = NS_CFG_RCTSIZE_16384_ENTRIES;
752 
753         card->efbie = 1;
754 
755         card->intcnt = 0;
756         if (request_irq
757             (pcidev->irq, &ns_irq_handler, IRQF_SHARED, "nicstar", card) != 0) {
758                 printk("nicstar%d: can't allocate IRQ %d.\n", i, pcidev->irq);
759                 error = 9;
760                 ns_init_card_error(card, error);
761                 return error;
762         }
763 
764         /* Register device */
765         card->atmdev = atm_dev_register("nicstar", &card->pcidev->dev, &atm_ops,
766                                         -1, NULL);
767         if (card->atmdev == NULL) {
768                 printk("nicstar%d: can't register device.\n", i);
769                 error = 17;
770                 ns_init_card_error(card, error);
771                 return error;
772         }
773 
774         if (mac[i] == NULL || !mac_pton(mac[i], card->atmdev->esi)) {
775                 nicstar_read_eprom(card->membase, NICSTAR_EPROM_MAC_ADDR_OFFSET,
776                                    card->atmdev->esi, 6);
777                 if (ether_addr_equal(card->atmdev->esi, "\x00\x00\x00\x00\x00\x00")) {
778                         nicstar_read_eprom(card->membase,
779                                            NICSTAR_EPROM_MAC_ADDR_OFFSET_ALT,
780                                            card->atmdev->esi, 6);
781                 }
782         }
783 
784         printk("nicstar%d: MAC address %pM\n", i, card->atmdev->esi);
785 
786         card->atmdev->dev_data = card;
787         card->atmdev->ci_range.vpi_bits = card->vpibits;
788         card->atmdev->ci_range.vci_bits = card->vcibits;
789         card->atmdev->link_rate = card->max_pcr;
790         card->atmdev->phy = NULL;
791 
792 #ifdef CONFIG_ATM_NICSTAR_USE_SUNI
793         if (card->max_pcr == ATM_OC3_PCR)
794                 suni_init(card->atmdev);
795 #endif /* CONFIG_ATM_NICSTAR_USE_SUNI */
796 
797 #ifdef CONFIG_ATM_NICSTAR_USE_IDT77105
798         if (card->max_pcr == ATM_25_PCR)
799                 idt77105_init(card->atmdev);
800 #endif /* CONFIG_ATM_NICSTAR_USE_IDT77105 */
801 
802         if (card->atmdev->phy && card->atmdev->phy->start)
803                 card->atmdev->phy->start(card->atmdev);
804 
805         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 */
806                NS_CFG_RSQAFIE | NS_CFG_TXEN | NS_CFG_TXIE | NS_CFG_TSQFIE_OPT | /* Only enabled if ENABLE_TSQFIE */
807                NS_CFG_PHYIE, card->membase + CFG);
808 
809         num_cards++;
810 
811         return error;
812 }
813 
814 static void ns_init_card_error(ns_dev *card, int error)
815 {
816         if (error >= 17) {
817                 writel(0x00000000, card->membase + CFG);
818         }
819         if (error >= 16) {
820                 struct sk_buff *iovb;
821                 while ((iovb = skb_dequeue(&card->iovpool.queue)) != NULL)
822                         dev_kfree_skb_any(iovb);
823         }
824         if (error >= 15) {
825                 struct sk_buff *sb;
826                 while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
827                         dev_kfree_skb_any(sb);
828                 free_scq(card, card->scq0, NULL);
829         }
830         if (error >= 14) {
831                 struct sk_buff *lb;
832                 while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
833                         dev_kfree_skb_any(lb);
834         }
835         if (error >= 13) {
836                 struct sk_buff *hb;
837                 while ((hb = skb_dequeue(&card->hbpool.queue)) != NULL)
838                         dev_kfree_skb_any(hb);
839         }
840         if (error >= 12) {
841                 kfree(card->rsq.org);
842         }
843         if (error >= 11) {
844                 kfree(card->tsq.org);
845         }
846         if (error >= 10) {
847                 free_irq(card->pcidev->irq, card);
848         }
849         if (error >= 4) {
850                 iounmap(card->membase);
851         }
852         if (error >= 3) {
853                 pci_disable_device(card->pcidev);
854                 kfree(card);
855         }
856 }
857 
858 static scq_info *get_scq(ns_dev *card, int size, u32 scd)
859 {
860         scq_info *scq;
861         int i;
862 
863         if (size != VBR_SCQSIZE && size != CBR_SCQSIZE)
864                 return NULL;
865 
866         scq = kmalloc(sizeof(*scq), GFP_KERNEL);
867         if (!scq)
868                 return NULL;
869         scq->org = dma_alloc_coherent(&card->pcidev->dev,
870                                       2 * size,  &scq->dma, GFP_KERNEL);
871         if (!scq->org) {
872                 kfree(scq);
873                 return NULL;
874         }
875         scq->skb = kmalloc_array(size / NS_SCQE_SIZE,
876                                  sizeof(*scq->skb),
877                                  GFP_KERNEL);
878         if (!scq->skb) {
879                 dma_free_coherent(&card->pcidev->dev,
880                                   2 * size, scq->org, scq->dma);
881                 kfree(scq);
882                 return NULL;
883         }
884         scq->num_entries = size / NS_SCQE_SIZE;
885         scq->base = PTR_ALIGN(scq->org, size);
886         scq->next = scq->base;
887         scq->last = scq->base + (scq->num_entries - 1);
888         scq->tail = scq->last;
889         scq->scd = scd;
890         scq->num_entries = size / NS_SCQE_SIZE;
891         scq->tbd_count = 0;
892         init_waitqueue_head(&scq->scqfull_waitq);
893         scq->full = 0;
894         spin_lock_init(&scq->lock);
895 
896         for (i = 0; i < scq->num_entries; i++)
897                 scq->skb[i] = NULL;
898 
899         return scq;
900 }
901 
902 /* For variable rate SCQ vcc must be NULL */
903 static void free_scq(ns_dev *card, scq_info *scq, struct atm_vcc *vcc)
904 {
905         int i;
906 
907         if (scq->num_entries == VBR_SCQ_NUM_ENTRIES)
908                 for (i = 0; i < scq->num_entries; i++) {
909                         if (scq->skb[i] != NULL) {
910                                 vcc = ATM_SKB(scq->skb[i])->vcc;
911                                 if (vcc->pop != NULL)
912                                         vcc->pop(vcc, scq->skb[i]);
913                                 else
914                                         dev_kfree_skb_any(scq->skb[i]);
915                         }
916         } else {                /* vcc must be != NULL */
917 
918                 if (vcc == NULL) {
919                         printk
920                             ("nicstar: free_scq() called with vcc == NULL for fixed rate scq.");
921                         for (i = 0; i < scq->num_entries; i++)
922                                 dev_kfree_skb_any(scq->skb[i]);
923                 } else
924                         for (i = 0; i < scq->num_entries; i++) {
925                                 if (scq->skb[i] != NULL) {
926                                         if (vcc->pop != NULL)
927                                                 vcc->pop(vcc, scq->skb[i]);
928                                         else
929                                                 dev_kfree_skb_any(scq->skb[i]);
930                                 }
931                         }
932         }
933         kfree(scq->skb);
934         dma_free_coherent(&card->pcidev->dev,
935                           2 * (scq->num_entries == VBR_SCQ_NUM_ENTRIES ?
936                                VBR_SCQSIZE : CBR_SCQSIZE),
937                           scq->org, scq->dma);
938         kfree(scq);
939 }
940 
941 /* The handles passed must be pointers to the sk_buff containing the small
942    or large buffer(s) cast to u32. */
943 static void push_rxbufs(ns_dev * card, struct sk_buff *skb)
944 {
945         struct sk_buff *handle1, *handle2;
946         int id1, id2;
947         u32 addr1, addr2;
948         u32 stat;
949         unsigned long flags;
950 
951         /* *BARF* */
952         handle2 = NULL;
953         addr2 = 0;
954         handle1 = skb;
955         addr1 = dma_map_single(&card->pcidev->dev,
956                                skb->data,
957                                (NS_PRV_BUFTYPE(skb) == BUF_SM
958                                 ? NS_SMSKBSIZE : NS_LGSKBSIZE),
959                                DMA_TO_DEVICE);
960         NS_PRV_DMA(skb) = addr1; /* save so we can unmap later */
961 
962 #ifdef GENERAL_DEBUG
963         if (!addr1)
964                 printk("nicstar%d: push_rxbufs called with addr1 = 0.\n",
965                        card->index);
966 #endif /* GENERAL_DEBUG */
967 
968         stat = readl(card->membase + STAT);
969         card->sbfqc = ns_stat_sfbqc_get(stat);
970         card->lbfqc = ns_stat_lfbqc_get(stat);
971         if (NS_PRV_BUFTYPE(skb) == BUF_SM) {
972                 if (!addr2) {
973                         if (card->sm_addr) {
974                                 addr2 = card->sm_addr;
975                                 handle2 = card->sm_handle;
976                                 card->sm_addr = 0x00000000;
977                                 card->sm_handle = NULL;
978                         } else {        /* (!sm_addr) */
979 
980                                 card->sm_addr = addr1;
981                                 card->sm_handle = handle1;
982                         }
983                 }
984         } else {                /* buf_type == BUF_LG */
985 
986                 if (!addr2) {
987                         if (card->lg_addr) {
988                                 addr2 = card->lg_addr;
989                                 handle2 = card->lg_handle;
990                                 card->lg_addr = 0x00000000;
991                                 card->lg_handle = NULL;
992                         } else {        /* (!lg_addr) */
993 
994                                 card->lg_addr = addr1;
995                                 card->lg_handle = handle1;
996                         }
997                 }
998         }
999 
1000         if (addr2) {
1001                 if (NS_PRV_BUFTYPE(skb) == BUF_SM) {
1002                         if (card->sbfqc >= card->sbnr.max) {
1003                                 skb_unlink(handle1, &card->sbpool.queue);
1004                                 dev_kfree_skb_any(handle1);
1005                                 skb_unlink(handle2, &card->sbpool.queue);
1006                                 dev_kfree_skb_any(handle2);
1007                                 return;
1008                         } else
1009                                 card->sbfqc += 2;
1010                 } else {        /* (buf_type == BUF_LG) */
1011 
1012                         if (card->lbfqc >= card->lbnr.max) {
1013                                 skb_unlink(handle1, &card->lbpool.queue);
1014                                 dev_kfree_skb_any(handle1);
1015                                 skb_unlink(handle2, &card->lbpool.queue);
1016                                 dev_kfree_skb_any(handle2);
1017                                 return;
1018                         } else
1019                                 card->lbfqc += 2;
1020                 }
1021 
1022                 id1 = idr_alloc(&card->idr, handle1, 0, 0, GFP_ATOMIC);
1023                 if (id1 < 0)
1024                         goto out;
1025 
1026                 id2 = idr_alloc(&card->idr, handle2, 0, 0, GFP_ATOMIC);
1027                 if (id2 < 0)
1028                         goto out;
1029 
1030                 spin_lock_irqsave(&card->res_lock, flags);
1031                 while (CMD_BUSY(card)) ;
1032                 writel(addr2, card->membase + DR3);
1033                 writel(id2, card->membase + DR2);
1034                 writel(addr1, card->membase + DR1);
1035                 writel(id1, card->membase + DR0);
1036                 writel(NS_CMD_WRITE_FREEBUFQ | NS_PRV_BUFTYPE(skb),
1037                        card->membase + CMD);
1038                 spin_unlock_irqrestore(&card->res_lock, flags);
1039 
1040                 XPRINTK("nicstar%d: Pushing %s buffers at 0x%x and 0x%x.\n",
1041                         card->index,
1042                         (NS_PRV_BUFTYPE(skb) == BUF_SM ? "small" : "large"),
1043                         addr1, addr2);
1044         }
1045 
1046         if (!card->efbie && card->sbfqc >= card->sbnr.min &&
1047             card->lbfqc >= card->lbnr.min) {
1048                 card->efbie = 1;
1049                 writel((readl(card->membase + CFG) | NS_CFG_EFBIE),
1050                        card->membase + CFG);
1051         }
1052 
1053 out:
1054         return;
1055 }
1056 
1057 static irqreturn_t ns_irq_handler(int irq, void *dev_id)
1058 {
1059         u32 stat_r;
1060         ns_dev *card;
1061         struct atm_dev *dev;
1062         unsigned long flags;
1063 
1064         card = (ns_dev *) dev_id;
1065         dev = card->atmdev;
1066         card->intcnt++;
1067 
1068         PRINTK("nicstar%d: NICStAR generated an interrupt\n", card->index);
1069 
1070         spin_lock_irqsave(&card->int_lock, flags);
1071 
1072         stat_r = readl(card->membase + STAT);
1073 
1074         /* Transmit Status Indicator has been written to T. S. Queue */
1075         if (stat_r & NS_STAT_TSIF) {
1076                 TXPRINTK("nicstar%d: TSI interrupt\n", card->index);
1077                 process_tsq(card);
1078                 writel(NS_STAT_TSIF, card->membase + STAT);
1079         }
1080 
1081         /* Incomplete CS-PDU has been transmitted */
1082         if (stat_r & NS_STAT_TXICP) {
1083                 writel(NS_STAT_TXICP, card->membase + STAT);
1084                 TXPRINTK("nicstar%d: Incomplete CS-PDU transmitted.\n",
1085                          card->index);
1086         }
1087 
1088         /* Transmit Status Queue 7/8 full */
1089         if (stat_r & NS_STAT_TSQF) {
1090                 writel(NS_STAT_TSQF, card->membase + STAT);
1091                 PRINTK("nicstar%d: TSQ full.\n", card->index);
1092                 process_tsq(card);
1093         }
1094 
1095         /* Timer overflow */
1096         if (stat_r & NS_STAT_TMROF) {
1097                 writel(NS_STAT_TMROF, card->membase + STAT);
1098                 PRINTK("nicstar%d: Timer overflow.\n", card->index);
1099         }
1100 
1101         /* PHY device interrupt signal active */
1102         if (stat_r & NS_STAT_PHYI) {
1103                 writel(NS_STAT_PHYI, card->membase + STAT);
1104                 PRINTK("nicstar%d: PHY interrupt.\n", card->index);
1105                 if (dev->phy && dev->phy->interrupt) {
1106                         dev->phy->interrupt(dev);
1107                 }
1108         }
1109 
1110         /* Small Buffer Queue is full */
1111         if (stat_r & NS_STAT_SFBQF) {
1112                 writel(NS_STAT_SFBQF, card->membase + STAT);
1113                 printk("nicstar%d: Small free buffer queue is full.\n",
1114                        card->index);
1115         }
1116 
1117         /* Large Buffer Queue is full */
1118         if (stat_r & NS_STAT_LFBQF) {
1119                 writel(NS_STAT_LFBQF, card->membase + STAT);
1120                 printk("nicstar%d: Large free buffer queue is full.\n",
1121                        card->index);
1122         }
1123 
1124         /* Receive Status Queue is full */
1125         if (stat_r & NS_STAT_RSQF) {
1126                 writel(NS_STAT_RSQF, card->membase + STAT);
1127                 printk("nicstar%d: RSQ full.\n", card->index);
1128                 process_rsq(card);
1129         }
1130 
1131         /* Complete CS-PDU received */
1132         if (stat_r & NS_STAT_EOPDU) {
1133                 RXPRINTK("nicstar%d: End of CS-PDU received.\n", card->index);
1134                 process_rsq(card);
1135                 writel(NS_STAT_EOPDU, card->membase + STAT);
1136         }
1137 
1138         /* Raw cell received */
1139         if (stat_r & NS_STAT_RAWCF) {
1140                 writel(NS_STAT_RAWCF, card->membase + STAT);
1141 #ifndef RCQ_SUPPORT
1142                 printk("nicstar%d: Raw cell received and no support yet...\n",
1143                        card->index);
1144 #endif /* RCQ_SUPPORT */
1145                 /* NOTE: the following procedure may keep a raw cell pending until the
1146                    next interrupt. As this preliminary support is only meant to
1147                    avoid buffer leakage, this is not an issue. */
1148                 while (readl(card->membase + RAWCT) != card->rawch) {
1149 
1150                         if (ns_rcqe_islast(card->rawcell)) {
1151                                 struct sk_buff *oldbuf;
1152 
1153                                 oldbuf = card->rcbuf;
1154                                 card->rcbuf = idr_find(&card->idr,
1155                                                        ns_rcqe_nextbufhandle(card->rawcell));
1156                                 card->rawch = NS_PRV_DMA(card->rcbuf);
1157                                 card->rawcell = (struct ns_rcqe *)
1158                                                 card->rcbuf->data;
1159                                 recycle_rx_buf(card, oldbuf);
1160                         } else {
1161                                 card->rawch += NS_RCQE_SIZE;
1162                                 card->rawcell++;
1163                         }
1164                 }
1165         }
1166 
1167         /* Small buffer queue is empty */
1168         if (stat_r & NS_STAT_SFBQE) {
1169                 int i;
1170                 struct sk_buff *sb;
1171 
1172                 writel(NS_STAT_SFBQE, card->membase + STAT);
1173                 printk("nicstar%d: Small free buffer queue empty.\n",
1174                        card->index);
1175                 for (i = 0; i < card->sbnr.min; i++) {
1176                         sb = dev_alloc_skb(NS_SMSKBSIZE);
1177                         if (sb == NULL) {
1178                                 writel(readl(card->membase + CFG) &
1179                                        ~NS_CFG_EFBIE, card->membase + CFG);
1180                                 card->efbie = 0;
1181                                 break;
1182                         }
1183                         NS_PRV_BUFTYPE(sb) = BUF_SM;
1184                         skb_queue_tail(&card->sbpool.queue, sb);
1185                         skb_reserve(sb, NS_AAL0_HEADER);
1186                         push_rxbufs(card, sb);
1187                 }
1188                 card->sbfqc = i;
1189                 process_rsq(card);
1190         }
1191 
1192         /* Large buffer queue empty */
1193         if (stat_r & NS_STAT_LFBQE) {
1194                 int i;
1195                 struct sk_buff *lb;
1196 
1197                 writel(NS_STAT_LFBQE, card->membase + STAT);
1198                 printk("nicstar%d: Large free buffer queue empty.\n",
1199                        card->index);
1200                 for (i = 0; i < card->lbnr.min; i++) {
1201                         lb = dev_alloc_skb(NS_LGSKBSIZE);
1202                         if (lb == NULL) {
1203                                 writel(readl(card->membase + CFG) &
1204                                        ~NS_CFG_EFBIE, card->membase + CFG);
1205                                 card->efbie = 0;
1206                                 break;
1207                         }
1208                         NS_PRV_BUFTYPE(lb) = BUF_LG;
1209                         skb_queue_tail(&card->lbpool.queue, lb);
1210                         skb_reserve(lb, NS_SMBUFSIZE);
1211                         push_rxbufs(card, lb);
1212                 }
1213                 card->lbfqc = i;
1214                 process_rsq(card);
1215         }
1216 
1217         /* Receive Status Queue is 7/8 full */
1218         if (stat_r & NS_STAT_RSQAF) {
1219                 writel(NS_STAT_RSQAF, card->membase + STAT);
1220                 RXPRINTK("nicstar%d: RSQ almost full.\n", card->index);
1221                 process_rsq(card);
1222         }
1223 
1224         spin_unlock_irqrestore(&card->int_lock, flags);
1225         PRINTK("nicstar%d: end of interrupt service\n", card->index);
1226         return IRQ_HANDLED;
1227 }
1228 
1229 static int ns_open(struct atm_vcc *vcc)
1230 {
1231         ns_dev *card;
1232         vc_map *vc;
1233         unsigned long tmpl, modl;
1234         int tcr, tcra;          /* target cell rate, and absolute value */
1235         int n = 0;              /* Number of entries in the TST. Initialized to remove
1236                                    the compiler warning. */
1237         u32 u32d[4];
1238         int frscdi = 0;         /* Index of the SCD. Initialized to remove the compiler
1239                                    warning. How I wish compilers were clever enough to
1240                                    tell which variables can truly be used
1241                                    uninitialized... */
1242         int inuse;              /* tx or rx vc already in use by another vcc */
1243         short vpi = vcc->vpi;
1244         int vci = vcc->vci;
1245 
1246         card = (ns_dev *) vcc->dev->dev_data;
1247         PRINTK("nicstar%d: opening vpi.vci %d.%d \n", card->index, (int)vpi,
1248                vci);
1249         if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0) {
1250                 PRINTK("nicstar%d: unsupported AAL.\n", card->index);
1251                 return -EINVAL;
1252         }
1253 
1254         vc = &(card->vcmap[vpi << card->vcibits | vci]);
1255         vcc->dev_data = vc;
1256 
1257         inuse = 0;
1258         if (vcc->qos.txtp.traffic_class != ATM_NONE && vc->tx)
1259                 inuse = 1;
1260         if (vcc->qos.rxtp.traffic_class != ATM_NONE && vc->rx)
1261                 inuse += 2;
1262         if (inuse) {
1263                 printk("nicstar%d: %s vci already in use.\n", card->index,
1264                        inuse == 1 ? "tx" : inuse == 2 ? "rx" : "tx and rx");
1265                 return -EINVAL;
1266         }
1267 
1268         set_bit(ATM_VF_ADDR, &vcc->flags);
1269 
1270         /* NOTE: You are not allowed to modify an open connection's QOS. To change
1271            that, remove the ATM_VF_PARTIAL flag checking. There may be other changes
1272            needed to do that. */
1273         if (!test_bit(ATM_VF_PARTIAL, &vcc->flags)) {
1274                 scq_info *scq;
1275 
1276                 set_bit(ATM_VF_PARTIAL, &vcc->flags);
1277                 if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1278                         /* Check requested cell rate and availability of SCD */
1279                         if (vcc->qos.txtp.max_pcr == 0 && vcc->qos.txtp.pcr == 0
1280                             && vcc->qos.txtp.min_pcr == 0) {
1281                                 PRINTK
1282                                     ("nicstar%d: trying to open a CBR vc with cell rate = 0 \n",
1283                                      card->index);
1284                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1285                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1286                                 return -EINVAL;
1287                         }
1288 
1289                         tcr = atm_pcr_goal(&(vcc->qos.txtp));
1290                         tcra = tcr >= 0 ? tcr : -tcr;
1291 
1292                         PRINTK("nicstar%d: target cell rate = %d.\n",
1293                                card->index, vcc->qos.txtp.max_pcr);
1294 
1295                         tmpl =
1296                             (unsigned long)tcra *(unsigned long)
1297                             NS_TST_NUM_ENTRIES;
1298                         modl = tmpl % card->max_pcr;
1299 
1300                         n = (int)(tmpl / card->max_pcr);
1301                         if (tcr > 0) {
1302                                 if (modl > 0)
1303                                         n++;
1304                         } else if (tcr == 0) {
1305                                 if ((n =
1306                                      (card->tst_free_entries -
1307                                       NS_TST_RESERVED)) <= 0) {
1308                                         PRINTK
1309                                             ("nicstar%d: no CBR bandwidth free.\n",
1310                                              card->index);
1311                                         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1312                                         clear_bit(ATM_VF_ADDR, &vcc->flags);
1313                                         return -EINVAL;
1314                                 }
1315                         }
1316 
1317                         if (n == 0) {
1318                                 printk
1319                                     ("nicstar%d: selected bandwidth < granularity.\n",
1320                                      card->index);
1321                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1322                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1323                                 return -EINVAL;
1324                         }
1325 
1326                         if (n > (card->tst_free_entries - NS_TST_RESERVED)) {
1327                                 PRINTK
1328                                     ("nicstar%d: not enough free CBR bandwidth.\n",
1329                                      card->index);
1330                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1331                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1332                                 return -EINVAL;
1333                         } else
1334                                 card->tst_free_entries -= n;
1335 
1336                         XPRINTK("nicstar%d: writing %d tst entries.\n",
1337                                 card->index, n);
1338                         for (frscdi = 0; frscdi < NS_FRSCD_NUM; frscdi++) {
1339                                 if (card->scd2vc[frscdi] == NULL) {
1340                                         card->scd2vc[frscdi] = vc;
1341                                         break;
1342                                 }
1343                         }
1344                         if (frscdi == NS_FRSCD_NUM) {
1345                                 PRINTK
1346                                     ("nicstar%d: no SCD available for CBR channel.\n",
1347                                      card->index);
1348                                 card->tst_free_entries += n;
1349                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1350                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1351                                 return -EBUSY;
1352                         }
1353 
1354                         vc->cbr_scd = NS_FRSCD + frscdi * NS_FRSCD_SIZE;
1355 
1356                         scq = get_scq(card, CBR_SCQSIZE, vc->cbr_scd);
1357                         if (scq == NULL) {
1358                                 PRINTK("nicstar%d: can't get fixed rate SCQ.\n",
1359                                        card->index);
1360                                 card->scd2vc[frscdi] = NULL;
1361                                 card->tst_free_entries += n;
1362                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1363                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1364                                 return -ENOMEM;
1365                         }
1366                         vc->scq = scq;
1367                         u32d[0] = scq_virt_to_bus(scq, scq->base);
1368                         u32d[1] = (u32) 0x00000000;
1369                         u32d[2] = (u32) 0xffffffff;
1370                         u32d[3] = (u32) 0x00000000;
1371                         ns_write_sram(card, vc->cbr_scd, u32d, 4);
1372 
1373                         fill_tst(card, n, vc);
1374                 } else if (vcc->qos.txtp.traffic_class == ATM_UBR) {
1375                         vc->cbr_scd = 0x00000000;
1376                         vc->scq = card->scq0;
1377                 }
1378 
1379                 if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1380                         vc->tx = 1;
1381                         vc->tx_vcc = vcc;
1382                         vc->tbd_count = 0;
1383                 }
1384                 if (vcc->qos.rxtp.traffic_class != ATM_NONE) {
1385                         u32 status;
1386 
1387                         vc->rx = 1;
1388                         vc->rx_vcc = vcc;
1389                         vc->rx_iov = NULL;
1390 
1391                         /* Open the connection in hardware */
1392                         if (vcc->qos.aal == ATM_AAL5)
1393                                 status = NS_RCTE_AAL5 | NS_RCTE_CONNECTOPEN;
1394                         else    /* vcc->qos.aal == ATM_AAL0 */
1395                                 status = NS_RCTE_AAL0 | NS_RCTE_CONNECTOPEN;
1396 #ifdef RCQ_SUPPORT
1397                         status |= NS_RCTE_RAWCELLINTEN;
1398 #endif /* RCQ_SUPPORT */
1399                         ns_write_sram(card,
1400                                       NS_RCT +
1401                                       (vpi << card->vcibits | vci) *
1402                                       NS_RCT_ENTRY_SIZE, &status, 1);
1403                 }
1404 
1405         }
1406 
1407         set_bit(ATM_VF_READY, &vcc->flags);
1408         return 0;
1409 }
1410 
1411 static void ns_close(struct atm_vcc *vcc)
1412 {
1413         vc_map *vc;
1414         ns_dev *card;
1415         u32 data;
1416         int i;
1417 
1418         vc = vcc->dev_data;
1419         card = vcc->dev->dev_data;
1420         PRINTK("nicstar%d: closing vpi.vci %d.%d \n", card->index,
1421                (int)vcc->vpi, vcc->vci);
1422 
1423         clear_bit(ATM_VF_READY, &vcc->flags);
1424 
1425         if (vcc->qos.rxtp.traffic_class != ATM_NONE) {
1426                 u32 addr;
1427                 unsigned long flags;
1428 
1429                 addr =
1430                     NS_RCT +
1431                     (vcc->vpi << card->vcibits | vcc->vci) * NS_RCT_ENTRY_SIZE;
1432                 spin_lock_irqsave(&card->res_lock, flags);
1433                 while (CMD_BUSY(card)) ;
1434                 writel(NS_CMD_CLOSE_CONNECTION | addr << 2,
1435                        card->membase + CMD);
1436                 spin_unlock_irqrestore(&card->res_lock, flags);
1437 
1438                 vc->rx = 0;
1439                 if (vc->rx_iov != NULL) {
1440                         struct sk_buff *iovb;
1441                         u32 stat;
1442 
1443                         stat = readl(card->membase + STAT);
1444                         card->sbfqc = ns_stat_sfbqc_get(stat);
1445                         card->lbfqc = ns_stat_lfbqc_get(stat);
1446 
1447                         PRINTK
1448                             ("nicstar%d: closing a VC with pending rx buffers.\n",
1449                              card->index);
1450                         iovb = vc->rx_iov;
1451                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
1452                                               NS_PRV_IOVCNT(iovb));
1453                         NS_PRV_IOVCNT(iovb) = 0;
1454                         spin_lock_irqsave(&card->int_lock, flags);
1455                         recycle_iov_buf(card, iovb);
1456                         spin_unlock_irqrestore(&card->int_lock, flags);
1457                         vc->rx_iov = NULL;
1458                 }
1459         }
1460 
1461         if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1462                 vc->tx = 0;
1463         }
1464 
1465         if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1466                 unsigned long flags;
1467                 ns_scqe *scqep;
1468                 scq_info *scq;
1469 
1470                 scq = vc->scq;
1471 
1472                 for (;;) {
1473                         spin_lock_irqsave(&scq->lock, flags);
1474                         scqep = scq->next;
1475                         if (scqep == scq->base)
1476                                 scqep = scq->last;
1477                         else
1478                                 scqep--;
1479                         if (scqep == scq->tail) {
1480                                 spin_unlock_irqrestore(&scq->lock, flags);
1481                                 break;
1482                         }
1483                         /* If the last entry is not a TSR, place one in the SCQ in order to
1484                            be able to completely drain it and then close. */
1485                         if (!ns_scqe_is_tsr(scqep) && scq->tail != scq->next) {
1486                                 ns_scqe tsr;
1487                                 u32 scdi, scqi;
1488                                 u32 data;
1489                                 int index;
1490 
1491                                 tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
1492                                 scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
1493                                 scqi = scq->next - scq->base;
1494                                 tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
1495                                 tsr.word_3 = 0x00000000;
1496                                 tsr.word_4 = 0x00000000;
1497                                 *scq->next = tsr;
1498                                 index = (int)scqi;
1499                                 scq->skb[index] = NULL;
1500                                 if (scq->next == scq->last)
1501                                         scq->next = scq->base;
1502                                 else
1503                                         scq->next++;
1504                                 data = scq_virt_to_bus(scq, scq->next);
1505                                 ns_write_sram(card, scq->scd, &data, 1);
1506                         }
1507                         spin_unlock_irqrestore(&scq->lock, flags);
1508                         schedule();
1509                 }
1510 
1511                 /* Free all TST entries */
1512                 data = NS_TST_OPCODE_VARIABLE;
1513                 for (i = 0; i < NS_TST_NUM_ENTRIES; i++) {
1514                         if (card->tste2vc[i] == vc) {
1515                                 ns_write_sram(card, card->tst_addr + i, &data,
1516                                               1);
1517                                 card->tste2vc[i] = NULL;
1518                                 card->tst_free_entries++;
1519                         }
1520                 }
1521 
1522                 card->scd2vc[(vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE] = NULL;
1523                 free_scq(card, vc->scq, vcc);
1524         }
1525 
1526         /* remove all references to vcc before deleting it */
1527         if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1528                 unsigned long flags;
1529                 scq_info *scq = card->scq0;
1530 
1531                 spin_lock_irqsave(&scq->lock, flags);
1532 
1533                 for (i = 0; i < scq->num_entries; i++) {
1534                         if (scq->skb[i] && ATM_SKB(scq->skb[i])->vcc == vcc) {
1535                                 ATM_SKB(scq->skb[i])->vcc = NULL;
1536                                 atm_return(vcc, scq->skb[i]->truesize);
1537                                 PRINTK
1538                                     ("nicstar: deleted pending vcc mapping\n");
1539                         }
1540                 }
1541 
1542                 spin_unlock_irqrestore(&scq->lock, flags);
1543         }
1544 
1545         vcc->dev_data = NULL;
1546         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1547         clear_bit(ATM_VF_ADDR, &vcc->flags);
1548 
1549 #ifdef RX_DEBUG
1550         {
1551                 u32 stat, cfg;
1552                 stat = readl(card->membase + STAT);
1553                 cfg = readl(card->membase + CFG);
1554                 printk("STAT = 0x%08X  CFG = 0x%08X  \n", stat, cfg);
1555                 printk
1556                     ("TSQ: base = 0x%p  next = 0x%p  last = 0x%p  TSQT = 0x%08X \n",
1557                      card->tsq.base, card->tsq.next,
1558                      card->tsq.last, readl(card->membase + TSQT));
1559                 printk
1560                     ("RSQ: base = 0x%p  next = 0x%p  last = 0x%p  RSQT = 0x%08X \n",
1561                      card->rsq.base, card->rsq.next,
1562                      card->rsq.last, readl(card->membase + RSQT));
1563                 printk("Empty free buffer queue interrupt %s \n",
1564                        card->efbie ? "enabled" : "disabled");
1565                 printk("SBCNT = %d  count = %d   LBCNT = %d count = %d \n",
1566                        ns_stat_sfbqc_get(stat), card->sbpool.count,
1567                        ns_stat_lfbqc_get(stat), card->lbpool.count);
1568                 printk("hbpool.count = %d  iovpool.count = %d \n",
1569                        card->hbpool.count, card->iovpool.count);
1570         }
1571 #endif /* RX_DEBUG */
1572 }
1573 
1574 static void fill_tst(ns_dev * card, int n, vc_map * vc)
1575 {
1576         u32 new_tst;
1577         unsigned long cl;
1578         int e, r;
1579         u32 data;
1580 
1581         /* It would be very complicated to keep the two TSTs synchronized while
1582            assuring that writes are only made to the inactive TST. So, for now I
1583            will use only one TST. If problems occur, I will change this again */
1584 
1585         new_tst = card->tst_addr;
1586 
1587         /* Fill procedure */
1588 
1589         for (e = 0; e < NS_TST_NUM_ENTRIES; e++) {
1590                 if (card->tste2vc[e] == NULL)
1591                         break;
1592         }
1593         if (e == NS_TST_NUM_ENTRIES) {
1594                 printk("nicstar%d: No free TST entries found. \n", card->index);
1595                 return;
1596         }
1597 
1598         r = n;
1599         cl = NS_TST_NUM_ENTRIES;
1600         data = ns_tste_make(NS_TST_OPCODE_FIXED, vc->cbr_scd);
1601 
1602         while (r > 0) {
1603                 if (cl >= NS_TST_NUM_ENTRIES && card->tste2vc[e] == NULL) {
1604                         card->tste2vc[e] = vc;
1605                         ns_write_sram(card, new_tst + e, &data, 1);
1606                         cl -= NS_TST_NUM_ENTRIES;
1607                         r--;
1608                 }
1609 
1610                 if (++e == NS_TST_NUM_ENTRIES) {
1611                         e = 0;
1612                 }
1613                 cl += n;
1614         }
1615 
1616         /* End of fill procedure */
1617 
1618         data = ns_tste_make(NS_TST_OPCODE_END, new_tst);
1619         ns_write_sram(card, new_tst + NS_TST_NUM_ENTRIES, &data, 1);
1620         ns_write_sram(card, card->tst_addr + NS_TST_NUM_ENTRIES, &data, 1);
1621         card->tst_addr = new_tst;
1622 }
1623 
1624 static int ns_send(struct atm_vcc *vcc, struct sk_buff *skb)
1625 {
1626         ns_dev *card;
1627         vc_map *vc;
1628         scq_info *scq;
1629         unsigned long buflen;
1630         ns_scqe scqe;
1631         u32 flags;              /* TBD flags, not CPU flags */
1632 
1633         card = vcc->dev->dev_data;
1634         TXPRINTK("nicstar%d: ns_send() called.\n", card->index);
1635         if ((vc = (vc_map *) vcc->dev_data) == NULL) {
1636                 printk("nicstar%d: vcc->dev_data == NULL on ns_send().\n",
1637                        card->index);
1638                 atomic_inc(&vcc->stats->tx_err);
1639                 dev_kfree_skb_any(skb);
1640                 return -EINVAL;
1641         }
1642 
1643         if (!vc->tx) {
1644                 printk("nicstar%d: Trying to transmit on a non-tx VC.\n",
1645                        card->index);
1646                 atomic_inc(&vcc->stats->tx_err);
1647                 dev_kfree_skb_any(skb);
1648                 return -EINVAL;
1649         }
1650 
1651         if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0) {
1652                 printk("nicstar%d: Only AAL0 and AAL5 are supported.\n",
1653                        card->index);
1654                 atomic_inc(&vcc->stats->tx_err);
1655                 dev_kfree_skb_any(skb);
1656                 return -EINVAL;
1657         }
1658 
1659         if (skb_shinfo(skb)->nr_frags != 0) {
1660                 printk("nicstar%d: No scatter-gather yet.\n", card->index);
1661                 atomic_inc(&vcc->stats->tx_err);
1662                 dev_kfree_skb_any(skb);
1663                 return -EINVAL;
1664         }
1665 
1666         ATM_SKB(skb)->vcc = vcc;
1667 
1668         NS_PRV_DMA(skb) = dma_map_single(&card->pcidev->dev, skb->data,
1669                                          skb->len, DMA_TO_DEVICE);
1670 
1671         if (vcc->qos.aal == ATM_AAL5) {
1672                 buflen = (skb->len + 47 + 8) / 48 * 48; /* Multiple of 48 */
1673                 flags = NS_TBD_AAL5;
1674                 scqe.word_2 = cpu_to_le32(NS_PRV_DMA(skb));
1675                 scqe.word_3 = cpu_to_le32(skb->len);
1676                 scqe.word_4 =
1677                     ns_tbd_mkword_4(0, (u32) vcc->vpi, (u32) vcc->vci, 0,
1678                                     ATM_SKB(skb)->
1679                                     atm_options & ATM_ATMOPT_CLP ? 1 : 0);
1680                 flags |= NS_TBD_EOPDU;
1681         } else {                /* (vcc->qos.aal == ATM_AAL0) */
1682 
1683                 buflen = ATM_CELL_PAYLOAD;      /* i.e., 48 bytes */
1684                 flags = NS_TBD_AAL0;
1685                 scqe.word_2 = cpu_to_le32(NS_PRV_DMA(skb) + NS_AAL0_HEADER);
1686                 scqe.word_3 = cpu_to_le32(0x00000000);
1687                 if (*skb->data & 0x02)  /* Payload type 1 - end of pdu */
1688                         flags |= NS_TBD_EOPDU;
1689                 scqe.word_4 =
1690                     cpu_to_le32(*((u32 *) skb->data) & ~NS_TBD_VC_MASK);
1691                 /* Force the VPI/VCI to be the same as in VCC struct */
1692                 scqe.word_4 |=
1693                     cpu_to_le32((((u32) vcc->
1694                                   vpi) << NS_TBD_VPI_SHIFT | ((u32) vcc->
1695                                                               vci) <<
1696                                  NS_TBD_VCI_SHIFT) & NS_TBD_VC_MASK);
1697         }
1698 
1699         if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1700                 scqe.word_1 = ns_tbd_mkword_1_novbr(flags, (u32) buflen);
1701                 scq = ((vc_map *) vcc->dev_data)->scq;
1702         } else {
1703                 scqe.word_1 =
1704                     ns_tbd_mkword_1(flags, (u32) 1, (u32) 1, (u32) buflen);
1705                 scq = card->scq0;
1706         }
1707 
1708         if (push_scqe(card, vc, scq, &scqe, skb) != 0) {
1709                 atomic_inc(&vcc->stats->tx_err);
1710                 dev_kfree_skb_any(skb);
1711                 return -EIO;
1712         }
1713         atomic_inc(&vcc->stats->tx);
1714 
1715         return 0;
1716 }
1717 
1718 static int push_scqe(ns_dev * card, vc_map * vc, scq_info * scq, ns_scqe * tbd,
1719                      struct sk_buff *skb)
1720 {
1721         unsigned long flags;
1722         ns_scqe tsr;
1723         u32 scdi, scqi;
1724         int scq_is_vbr;
1725         u32 data;
1726         int index;
1727 
1728         spin_lock_irqsave(&scq->lock, flags);
1729         while (scq->tail == scq->next) {
1730                 if (in_interrupt()) {
1731                         spin_unlock_irqrestore(&scq->lock, flags);
1732                         printk("nicstar%d: Error pushing TBD.\n", card->index);
1733                         return 1;
1734                 }
1735 
1736                 scq->full = 1;
1737                 wait_event_interruptible_lock_irq_timeout(scq->scqfull_waitq,
1738                                                           scq->tail != scq->next,
1739                                                           scq->lock,
1740                                                           SCQFULL_TIMEOUT);
1741 
1742                 if (scq->full) {
1743                         spin_unlock_irqrestore(&scq->lock, flags);
1744                         printk("nicstar%d: Timeout pushing TBD.\n",
1745                                card->index);
1746                         return 1;
1747                 }
1748         }
1749         *scq->next = *tbd;
1750         index = (int)(scq->next - scq->base);
1751         scq->skb[index] = skb;
1752         XPRINTK("nicstar%d: sending skb at 0x%p (pos %d).\n",
1753                 card->index, skb, index);
1754         XPRINTK("nicstar%d: TBD written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%p.\n",
1755                 card->index, le32_to_cpu(tbd->word_1), le32_to_cpu(tbd->word_2),
1756                 le32_to_cpu(tbd->word_3), le32_to_cpu(tbd->word_4),
1757                 scq->next);
1758         if (scq->next == scq->last)
1759                 scq->next = scq->base;
1760         else
1761                 scq->next++;
1762 
1763         vc->tbd_count++;
1764         if (scq->num_entries == VBR_SCQ_NUM_ENTRIES) {
1765                 scq->tbd_count++;
1766                 scq_is_vbr = 1;
1767         } else
1768                 scq_is_vbr = 0;
1769 
1770         if (vc->tbd_count >= MAX_TBD_PER_VC
1771             || scq->tbd_count >= MAX_TBD_PER_SCQ) {
1772                 int has_run = 0;
1773 
1774                 while (scq->tail == scq->next) {
1775                         if (in_interrupt()) {
1776                                 data = scq_virt_to_bus(scq, scq->next);
1777                                 ns_write_sram(card, scq->scd, &data, 1);
1778                                 spin_unlock_irqrestore(&scq->lock, flags);
1779                                 printk("nicstar%d: Error pushing TSR.\n",
1780                                        card->index);
1781                                 return 0;
1782                         }
1783 
1784                         scq->full = 1;
1785                         if (has_run++)
1786                                 break;
1787                         wait_event_interruptible_lock_irq_timeout(scq->scqfull_waitq,
1788                                                                   scq->tail != scq->next,
1789                                                                   scq->lock,
1790                                                                   SCQFULL_TIMEOUT);
1791                 }
1792 
1793                 if (!scq->full) {
1794                         tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
1795                         if (scq_is_vbr)
1796                                 scdi = NS_TSR_SCDISVBR;
1797                         else
1798                                 scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
1799                         scqi = scq->next - scq->base;
1800                         tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
1801                         tsr.word_3 = 0x00000000;
1802                         tsr.word_4 = 0x00000000;
1803 
1804                         *scq->next = tsr;
1805                         index = (int)scqi;
1806                         scq->skb[index] = NULL;
1807                         XPRINTK
1808                             ("nicstar%d: TSR written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%p.\n",
1809                              card->index, le32_to_cpu(tsr.word_1),
1810                              le32_to_cpu(tsr.word_2), le32_to_cpu(tsr.word_3),
1811                              le32_to_cpu(tsr.word_4), scq->next);
1812                         if (scq->next == scq->last)
1813                                 scq->next = scq->base;
1814                         else
1815                                 scq->next++;
1816                         vc->tbd_count = 0;
1817                         scq->tbd_count = 0;
1818                 } else
1819                         PRINTK("nicstar%d: Timeout pushing TSR.\n",
1820                                card->index);
1821         }
1822         data = scq_virt_to_bus(scq, scq->next);
1823         ns_write_sram(card, scq->scd, &data, 1);
1824 
1825         spin_unlock_irqrestore(&scq->lock, flags);
1826 
1827         return 0;
1828 }
1829 
1830 static void process_tsq(ns_dev * card)
1831 {
1832         u32 scdi;
1833         scq_info *scq;
1834         ns_tsi *previous = NULL, *one_ahead, *two_ahead;
1835         int serviced_entries;   /* flag indicating at least on entry was serviced */
1836 
1837         serviced_entries = 0;
1838 
1839         if (card->tsq.next == card->tsq.last)
1840                 one_ahead = card->tsq.base;
1841         else
1842                 one_ahead = card->tsq.next + 1;
1843 
1844         if (one_ahead == card->tsq.last)
1845                 two_ahead = card->tsq.base;
1846         else
1847                 two_ahead = one_ahead + 1;
1848 
1849         while (!ns_tsi_isempty(card->tsq.next) || !ns_tsi_isempty(one_ahead) ||
1850                !ns_tsi_isempty(two_ahead))
1851                 /* At most two empty, as stated in the 77201 errata */
1852         {
1853                 serviced_entries = 1;
1854 
1855                 /* Skip the one or two possible empty entries */
1856                 while (ns_tsi_isempty(card->tsq.next)) {
1857                         if (card->tsq.next == card->tsq.last)
1858                                 card->tsq.next = card->tsq.base;
1859                         else
1860                                 card->tsq.next++;
1861                 }
1862 
1863                 if (!ns_tsi_tmrof(card->tsq.next)) {
1864                         scdi = ns_tsi_getscdindex(card->tsq.next);
1865                         if (scdi == NS_TSI_SCDISVBR)
1866                                 scq = card->scq0;
1867                         else {
1868                                 if (card->scd2vc[scdi] == NULL) {
1869                                         printk
1870                                             ("nicstar%d: could not find VC from SCD index.\n",
1871                                              card->index);
1872                                         ns_tsi_init(card->tsq.next);
1873                                         return;
1874                                 }
1875                                 scq = card->scd2vc[scdi]->scq;
1876                         }
1877                         drain_scq(card, scq, ns_tsi_getscqpos(card->tsq.next));
1878                         scq->full = 0;
1879                         wake_up_interruptible(&(scq->scqfull_waitq));
1880                 }
1881 
1882                 ns_tsi_init(card->tsq.next);
1883                 previous = card->tsq.next;
1884                 if (card->tsq.next == card->tsq.last)
1885                         card->tsq.next = card->tsq.base;
1886                 else
1887                         card->tsq.next++;
1888 
1889                 if (card->tsq.next == card->tsq.last)
1890                         one_ahead = card->tsq.base;
1891                 else
1892                         one_ahead = card->tsq.next + 1;
1893 
1894                 if (one_ahead == card->tsq.last)
1895                         two_ahead = card->tsq.base;
1896                 else
1897                         two_ahead = one_ahead + 1;
1898         }
1899 
1900         if (serviced_entries)
1901                 writel(PTR_DIFF(previous, card->tsq.base),
1902                        card->membase + TSQH);
1903 }
1904 
1905 static void drain_scq(ns_dev * card, scq_info * scq, int pos)
1906 {
1907         struct atm_vcc *vcc;
1908         struct sk_buff *skb;
1909         int i;
1910         unsigned long flags;
1911 
1912         XPRINTK("nicstar%d: drain_scq() called, scq at 0x%p, pos %d.\n",
1913                 card->index, scq, pos);
1914         if (pos >= scq->num_entries) {
1915                 printk("nicstar%d: Bad index on drain_scq().\n", card->index);
1916                 return;
1917         }
1918 
1919         spin_lock_irqsave(&scq->lock, flags);
1920         i = (int)(scq->tail - scq->base);
1921         if (++i == scq->num_entries)
1922                 i = 0;
1923         while (i != pos) {
1924                 skb = scq->skb[i];
1925                 XPRINTK("nicstar%d: freeing skb at 0x%p (index %d).\n",
1926                         card->index, skb, i);
1927                 if (skb != NULL) {
1928                         dma_unmap_single(&card->pcidev->dev,
1929                                          NS_PRV_DMA(skb),
1930                                          skb->len,
1931                                          DMA_TO_DEVICE);
1932                         vcc = ATM_SKB(skb)->vcc;
1933                         if (vcc && vcc->pop != NULL) {
1934                                 vcc->pop(vcc, skb);
1935                         } else {
1936                                 dev_kfree_skb_irq(skb);
1937                         }
1938                         scq->skb[i] = NULL;
1939                 }
1940                 if (++i == scq->num_entries)
1941                         i = 0;
1942         }
1943         scq->tail = scq->base + pos;
1944         spin_unlock_irqrestore(&scq->lock, flags);
1945 }
1946 
1947 static void process_rsq(ns_dev * card)
1948 {
1949         ns_rsqe *previous;
1950 
1951         if (!ns_rsqe_valid(card->rsq.next))
1952                 return;
1953         do {
1954                 dequeue_rx(card, card->rsq.next);
1955                 ns_rsqe_init(card->rsq.next);
1956                 previous = card->rsq.next;
1957                 if (card->rsq.next == card->rsq.last)
1958                         card->rsq.next = card->rsq.base;
1959                 else
1960                         card->rsq.next++;
1961         } while (ns_rsqe_valid(card->rsq.next));
1962         writel(PTR_DIFF(previous, card->rsq.base), card->membase + RSQH);
1963 }
1964 
1965 static void dequeue_rx(ns_dev * card, ns_rsqe * rsqe)
1966 {
1967         u32 vpi, vci;
1968         vc_map *vc;
1969         struct sk_buff *iovb;
1970         struct iovec *iov;
1971         struct atm_vcc *vcc;
1972         struct sk_buff *skb;
1973         unsigned short aal5_len;
1974         int len;
1975         u32 stat;
1976         u32 id;
1977 
1978         stat = readl(card->membase + STAT);
1979         card->sbfqc = ns_stat_sfbqc_get(stat);
1980         card->lbfqc = ns_stat_lfbqc_get(stat);
1981 
1982         id = le32_to_cpu(rsqe->buffer_handle);
1983         skb = idr_find(&card->idr, id);
1984         if (!skb) {
1985                 RXPRINTK(KERN_ERR
1986                          "nicstar%d: idr_find() failed!\n", card->index);
1987                 return;
1988         }
1989         idr_remove(&card->idr, id);
1990         dma_sync_single_for_cpu(&card->pcidev->dev,
1991                                 NS_PRV_DMA(skb),
1992                                 (NS_PRV_BUFTYPE(skb) == BUF_SM
1993                                  ? NS_SMSKBSIZE : NS_LGSKBSIZE),
1994                                 DMA_FROM_DEVICE);
1995         dma_unmap_single(&card->pcidev->dev,
1996                          NS_PRV_DMA(skb),
1997                          (NS_PRV_BUFTYPE(skb) == BUF_SM
1998                           ? NS_SMSKBSIZE : NS_LGSKBSIZE),
1999                          DMA_FROM_DEVICE);
2000         vpi = ns_rsqe_vpi(rsqe);
2001         vci = ns_rsqe_vci(rsqe);
2002         if (vpi >= 1UL << card->vpibits || vci >= 1UL << card->vcibits) {
2003                 printk("nicstar%d: SDU received for out-of-range vc %d.%d.\n",
2004                        card->index, vpi, vci);
2005                 recycle_rx_buf(card, skb);
2006                 return;
2007         }
2008 
2009         vc = &(card->vcmap[vpi << card->vcibits | vci]);
2010         if (!vc->rx) {
2011                 RXPRINTK("nicstar%d: SDU received on non-rx vc %d.%d.\n",
2012                          card->index, vpi, vci);
2013                 recycle_rx_buf(card, skb);
2014                 return;
2015         }
2016 
2017         vcc = vc->rx_vcc;
2018 
2019         if (vcc->qos.aal == ATM_AAL0) {
2020                 struct sk_buff *sb;
2021                 unsigned char *cell;
2022                 int i;
2023 
2024                 cell = skb->data;
2025                 for (i = ns_rsqe_cellcount(rsqe); i; i--) {
2026                         sb = dev_alloc_skb(NS_SMSKBSIZE);
2027                         if (!sb) {
2028                                 printk
2029                                     ("nicstar%d: Can't allocate buffers for aal0.\n",
2030                                      card->index);
2031                                 atomic_add(i, &vcc->stats->rx_drop);
2032                                 break;
2033                         }
2034                         if (!atm_charge(vcc, sb->truesize)) {
2035                                 RXPRINTK
2036                                     ("nicstar%d: atm_charge() dropped aal0 packets.\n",
2037                                      card->index);
2038                                 atomic_add(i - 1, &vcc->stats->rx_drop);        /* already increased by 1 */
2039                                 dev_kfree_skb_any(sb);
2040                                 break;
2041                         }
2042                         /* Rebuild the header */
2043                         *((u32 *) sb->data) = le32_to_cpu(rsqe->word_1) << 4 |
2044                             (ns_rsqe_clp(rsqe) ? 0x00000001 : 0x00000000);
2045                         if (i == 1 && ns_rsqe_eopdu(rsqe))
2046                                 *((u32 *) sb->data) |= 0x00000002;
2047                         skb_put(sb, NS_AAL0_HEADER);
2048                         memcpy(skb_tail_pointer(sb), cell, ATM_CELL_PAYLOAD);
2049                         skb_put(sb, ATM_CELL_PAYLOAD);
2050                         ATM_SKB(sb)->vcc = vcc;
2051                         __net_timestamp(sb);
2052                         vcc->push(vcc, sb);
2053                         atomic_inc(&vcc->stats->rx);
2054                         cell += ATM_CELL_PAYLOAD;
2055                 }
2056 
2057                 recycle_rx_buf(card, skb);
2058                 return;
2059         }
2060 
2061         /* To reach this point, the AAL layer can only be AAL5 */
2062 
2063         if ((iovb = vc->rx_iov) == NULL) {
2064                 iovb = skb_dequeue(&(card->iovpool.queue));
2065                 if (iovb == NULL) {     /* No buffers in the queue */
2066                         iovb = alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC);
2067                         if (iovb == NULL) {
2068                                 printk("nicstar%d: Out of iovec buffers.\n",
2069                                        card->index);
2070                                 atomic_inc(&vcc->stats->rx_drop);
2071                                 recycle_rx_buf(card, skb);
2072                                 return;
2073                         }
2074                         NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2075                 } else if (--card->iovpool.count < card->iovnr.min) {
2076                         struct sk_buff *new_iovb;
2077                         if ((new_iovb =
2078                              alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC)) != NULL) {
2079                                 NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2080                                 skb_queue_tail(&card->iovpool.queue, new_iovb);
2081                                 card->iovpool.count++;
2082                         }
2083                 }
2084                 vc->rx_iov = iovb;
2085                 NS_PRV_IOVCNT(iovb) = 0;
2086                 iovb->len = 0;
2087                 iovb->data = iovb->head;
2088                 skb_reset_tail_pointer(iovb);
2089                 /* IMPORTANT: a pointer to the sk_buff containing the small or large
2090                    buffer is stored as iovec base, NOT a pointer to the
2091                    small or large buffer itself. */
2092         } else if (NS_PRV_IOVCNT(iovb) >= NS_MAX_IOVECS) {
2093                 printk("nicstar%d: received too big AAL5 SDU.\n", card->index);
2094                 atomic_inc(&vcc->stats->rx_err);
2095                 recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2096                                       NS_MAX_IOVECS);
2097                 NS_PRV_IOVCNT(iovb) = 0;
2098                 iovb->len = 0;
2099                 iovb->data = iovb->head;
2100                 skb_reset_tail_pointer(iovb);
2101         }
2102         iov = &((struct iovec *)iovb->data)[NS_PRV_IOVCNT(iovb)++];
2103         iov->iov_base = (void *)skb;
2104         iov->iov_len = ns_rsqe_cellcount(rsqe) * 48;
2105         iovb->len += iov->iov_len;
2106 
2107 #ifdef EXTRA_DEBUG
2108         if (NS_PRV_IOVCNT(iovb) == 1) {
2109                 if (NS_PRV_BUFTYPE(skb) != BUF_SM) {
2110                         printk
2111                             ("nicstar%d: Expected a small buffer, and this is not one.\n",
2112                              card->index);
2113                         which_list(card, skb);
2114                         atomic_inc(&vcc->stats->rx_err);
2115                         recycle_rx_buf(card, skb);
2116                         vc->rx_iov = NULL;
2117                         recycle_iov_buf(card, iovb);
2118                         return;
2119                 }
2120         } else {                /* NS_PRV_IOVCNT(iovb) >= 2 */
2121 
2122                 if (NS_PRV_BUFTYPE(skb) != BUF_LG) {
2123                         printk
2124                             ("nicstar%d: Expected a large buffer, and this is not one.\n",
2125                              card->index);
2126                         which_list(card, skb);
2127                         atomic_inc(&vcc->stats->rx_err);
2128                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2129                                               NS_PRV_IOVCNT(iovb));
2130                         vc->rx_iov = NULL;
2131                         recycle_iov_buf(card, iovb);
2132                         return;
2133                 }
2134         }
2135 #endif /* EXTRA_DEBUG */
2136 
2137         if (ns_rsqe_eopdu(rsqe)) {
2138                 /* This works correctly regardless of the endianness of the host */
2139                 unsigned char *L1L2 = (unsigned char *)
2140                                                 (skb->data + iov->iov_len - 6);
2141                 aal5_len = L1L2[0] << 8 | L1L2[1];
2142                 len = (aal5_len == 0x0000) ? 0x10000 : aal5_len;
2143                 if (ns_rsqe_crcerr(rsqe) ||
2144                     len + 8 > iovb->len || len + (47 + 8) < iovb->len) {
2145                         printk("nicstar%d: AAL5 CRC error", card->index);
2146                         if (len + 8 > iovb->len || len + (47 + 8) < iovb->len)
2147                                 printk(" - PDU size mismatch.\n");
2148                         else
2149                                 printk(".\n");
2150                         atomic_inc(&vcc->stats->rx_err);
2151                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2152                                               NS_PRV_IOVCNT(iovb));
2153                         vc->rx_iov = NULL;
2154                         recycle_iov_buf(card, iovb);
2155                         return;
2156                 }
2157 
2158                 /* By this point we (hopefully) have a complete SDU without errors. */
2159 
2160                 if (NS_PRV_IOVCNT(iovb) == 1) { /* Just a small buffer */
2161                         /* skb points to a small buffer */
2162                         if (!atm_charge(vcc, skb->truesize)) {
2163                                 push_rxbufs(card, skb);
2164                                 atomic_inc(&vcc->stats->rx_drop);
2165                         } else {
2166                                 skb_put(skb, len);
2167                                 dequeue_sm_buf(card, skb);
2168                                 ATM_SKB(skb)->vcc = vcc;
2169                                 __net_timestamp(skb);
2170                                 vcc->push(vcc, skb);
2171                                 atomic_inc(&vcc->stats->rx);
2172                         }
2173                 } else if (NS_PRV_IOVCNT(iovb) == 2) {  /* One small plus one large buffer */
2174                         struct sk_buff *sb;
2175 
2176                         sb = (struct sk_buff *)(iov - 1)->iov_base;
2177                         /* skb points to a large buffer */
2178 
2179                         if (len <= NS_SMBUFSIZE) {
2180                                 if (!atm_charge(vcc, sb->truesize)) {
2181                                         push_rxbufs(card, sb);
2182                                         atomic_inc(&vcc->stats->rx_drop);
2183                                 } else {
2184                                         skb_put(sb, len);
2185                                         dequeue_sm_buf(card, sb);
2186                                         ATM_SKB(sb)->vcc = vcc;
2187                                         __net_timestamp(sb);
2188                                         vcc->push(vcc, sb);
2189                                         atomic_inc(&vcc->stats->rx);
2190                                 }
2191 
2192                                 push_rxbufs(card, skb);
2193 
2194                         } else {        /* len > NS_SMBUFSIZE, the usual case */
2195 
2196                                 if (!atm_charge(vcc, skb->truesize)) {
2197                                         push_rxbufs(card, skb);
2198                                         atomic_inc(&vcc->stats->rx_drop);
2199                                 } else {
2200                                         dequeue_lg_buf(card, skb);
2201                                         skb_push(skb, NS_SMBUFSIZE);
2202                                         skb_copy_from_linear_data(sb, skb->data,
2203                                                                   NS_SMBUFSIZE);
2204                                         skb_put(skb, len - NS_SMBUFSIZE);
2205                                         ATM_SKB(skb)->vcc = vcc;
2206                                         __net_timestamp(skb);
2207                                         vcc->push(vcc, skb);
2208                                         atomic_inc(&vcc->stats->rx);
2209                                 }
2210 
2211                                 push_rxbufs(card, sb);
2212 
2213                         }
2214 
2215                 } else {        /* Must push a huge buffer */
2216 
2217                         struct sk_buff *hb, *sb, *lb;
2218                         int remaining, tocopy;
2219                         int j;
2220 
2221                         hb = skb_dequeue(&(card->hbpool.queue));
2222                         if (hb == NULL) {       /* No buffers in the queue */
2223 
2224                                 hb = dev_alloc_skb(NS_HBUFSIZE);
2225                                 if (hb == NULL) {
2226                                         printk
2227                                             ("nicstar%d: Out of huge buffers.\n",
2228                                              card->index);
2229                                         atomic_inc(&vcc->stats->rx_drop);
2230                                         recycle_iovec_rx_bufs(card,
2231                                                               (struct iovec *)
2232                                                               iovb->data,
2233                                                               NS_PRV_IOVCNT(iovb));
2234                                         vc->rx_iov = NULL;
2235                                         recycle_iov_buf(card, iovb);
2236                                         return;
2237                                 } else if (card->hbpool.count < card->hbnr.min) {
2238                                         struct sk_buff *new_hb;
2239                                         if ((new_hb =
2240                                              dev_alloc_skb(NS_HBUFSIZE)) !=
2241                                             NULL) {
2242                                                 skb_queue_tail(&card->hbpool.
2243                                                                queue, new_hb);
2244                                                 card->hbpool.count++;
2245                                         }
2246                                 }
2247                                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
2248                         } else if (--card->hbpool.count < card->hbnr.min) {
2249                                 struct sk_buff *new_hb;
2250                                 if ((new_hb =
2251                                      dev_alloc_skb(NS_HBUFSIZE)) != NULL) {
2252                                         NS_PRV_BUFTYPE(new_hb) = BUF_NONE;
2253                                         skb_queue_tail(&card->hbpool.queue,
2254                                                        new_hb);
2255                                         card->hbpool.count++;
2256                                 }
2257                                 if (card->hbpool.count < card->hbnr.min) {
2258                                         if ((new_hb =
2259                                              dev_alloc_skb(NS_HBUFSIZE)) !=
2260                                             NULL) {
2261                                                 NS_PRV_BUFTYPE(new_hb) =
2262                                                     BUF_NONE;
2263                                                 skb_queue_tail(&card->hbpool.
2264                                                                queue, new_hb);
2265                                                 card->hbpool.count++;
2266                                         }
2267                                 }
2268                         }
2269 
2270                         iov = (struct iovec *)iovb->data;
2271 
2272                         if (!atm_charge(vcc, hb->truesize)) {
2273                                 recycle_iovec_rx_bufs(card, iov,
2274                                                       NS_PRV_IOVCNT(iovb));
2275                                 if (card->hbpool.count < card->hbnr.max) {
2276                                         skb_queue_tail(&card->hbpool.queue, hb);
2277                                         card->hbpool.count++;
2278                                 } else
2279                                         dev_kfree_skb_any(hb);
2280                                 atomic_inc(&vcc->stats->rx_drop);
2281                         } else {
2282                                 /* Copy the small buffer to the huge buffer */
2283                                 sb = (struct sk_buff *)iov->iov_base;
2284                                 skb_copy_from_linear_data(sb, hb->data,
2285                                                           iov->iov_len);
2286                                 skb_put(hb, iov->iov_len);
2287                                 remaining = len - iov->iov_len;
2288                                 iov++;
2289                                 /* Free the small buffer */
2290                                 push_rxbufs(card, sb);
2291 
2292                                 /* Copy all large buffers to the huge buffer and free them */
2293                                 for (j = 1; j < NS_PRV_IOVCNT(iovb); j++) {
2294                                         lb = (struct sk_buff *)iov->iov_base;
2295                                         tocopy =
2296                                             min_t(int, remaining, iov->iov_len);
2297                                         skb_copy_from_linear_data(lb,
2298                                                                   skb_tail_pointer
2299                                                                   (hb), tocopy);
2300                                         skb_put(hb, tocopy);
2301                                         iov++;
2302                                         remaining -= tocopy;
2303                                         push_rxbufs(card, lb);
2304                                 }
2305 #ifdef EXTRA_DEBUG
2306                                 if (remaining != 0 || hb->len != len)
2307                                         printk
2308                                             ("nicstar%d: Huge buffer len mismatch.\n",
2309                                              card->index);
2310 #endif /* EXTRA_DEBUG */
2311                                 ATM_SKB(hb)->vcc = vcc;
2312                                 __net_timestamp(hb);
2313                                 vcc->push(vcc, hb);
2314                                 atomic_inc(&vcc->stats->rx);
2315                         }
2316                 }
2317 
2318                 vc->rx_iov = NULL;
2319                 recycle_iov_buf(card, iovb);
2320         }
2321 
2322 }
2323 
2324 static void recycle_rx_buf(ns_dev * card, struct sk_buff *skb)
2325 {
2326         if (unlikely(NS_PRV_BUFTYPE(skb) == BUF_NONE)) {
2327                 printk("nicstar%d: What kind of rx buffer is this?\n",
2328                        card->index);
2329                 dev_kfree_skb_any(skb);
2330         } else
2331                 push_rxbufs(card, skb);
2332 }
2333 
2334 static void recycle_iovec_rx_bufs(ns_dev * card, struct iovec *iov, int count)
2335 {
2336         while (count-- > 0)
2337                 recycle_rx_buf(card, (struct sk_buff *)(iov++)->iov_base);
2338 }
2339 
2340 static void recycle_iov_buf(ns_dev * card, struct sk_buff *iovb)
2341 {
2342         if (card->iovpool.count < card->iovnr.max) {
2343                 skb_queue_tail(&card->iovpool.queue, iovb);
2344                 card->iovpool.count++;
2345         } else
2346                 dev_kfree_skb_any(iovb);
2347 }
2348 
2349 static void dequeue_sm_buf(ns_dev * card, struct sk_buff *sb)
2350 {
2351         skb_unlink(sb, &card->sbpool.queue);
2352         if (card->sbfqc < card->sbnr.init) {
2353                 struct sk_buff *new_sb;
2354                 if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL) {
2355                         NS_PRV_BUFTYPE(new_sb) = BUF_SM;
2356                         skb_queue_tail(&card->sbpool.queue, new_sb);
2357                         skb_reserve(new_sb, NS_AAL0_HEADER);
2358                         push_rxbufs(card, new_sb);
2359                 }
2360         }
2361         if (card->sbfqc < card->sbnr.init)
2362         {
2363                 struct sk_buff *new_sb;
2364                 if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL) {
2365                         NS_PRV_BUFTYPE(new_sb) = BUF_SM;
2366                         skb_queue_tail(&card->sbpool.queue, new_sb);
2367                         skb_reserve(new_sb, NS_AAL0_HEADER);
2368                         push_rxbufs(card, new_sb);
2369                 }
2370         }
2371 }
2372 
2373 static void dequeue_lg_buf(ns_dev * card, struct sk_buff *lb)
2374 {
2375         skb_unlink(lb, &card->lbpool.queue);
2376         if (card->lbfqc < card->lbnr.init) {
2377                 struct sk_buff *new_lb;
2378                 if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL) {
2379                         NS_PRV_BUFTYPE(new_lb) = BUF_LG;
2380                         skb_queue_tail(&card->lbpool.queue, new_lb);
2381                         skb_reserve(new_lb, NS_SMBUFSIZE);
2382                         push_rxbufs(card, new_lb);
2383                 }
2384         }
2385         if (card->lbfqc < card->lbnr.init)
2386         {
2387                 struct sk_buff *new_lb;
2388                 if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL) {
2389                         NS_PRV_BUFTYPE(new_lb) = BUF_LG;
2390                         skb_queue_tail(&card->lbpool.queue, new_lb);
2391                         skb_reserve(new_lb, NS_SMBUFSIZE);
2392                         push_rxbufs(card, new_lb);
2393                 }
2394         }
2395 }
2396 
2397 static int ns_proc_read(struct atm_dev *dev, loff_t * pos, char *page)
2398 {
2399         u32 stat;
2400         ns_dev *card;
2401         int left;
2402 
2403         left = (int)*pos;
2404         card = (ns_dev *) dev->dev_data;
2405         stat = readl(card->membase + STAT);
2406         if (!left--)
2407                 return sprintf(page, "Pool   count    min   init    max \n");
2408         if (!left--)
2409                 return sprintf(page, "Small  %5d  %5d  %5d  %5d \n",
2410                                ns_stat_sfbqc_get(stat), card->sbnr.min,
2411                                card->sbnr.init, card->sbnr.max);
2412         if (!left--)
2413                 return sprintf(page, "Large  %5d  %5d  %5d  %5d \n",
2414                                ns_stat_lfbqc_get(stat), card->lbnr.min,
2415                                card->lbnr.init, card->lbnr.max);
2416         if (!left--)
2417                 return sprintf(page, "Huge   %5d  %5d  %5d  %5d \n",
2418                                card->hbpool.count, card->hbnr.min,
2419                                card->hbnr.init, card->hbnr.max);
2420         if (!left--)
2421                 return sprintf(page, "Iovec  %5d  %5d  %5d  %5d \n",
2422                                card->iovpool.count, card->iovnr.min,
2423                                card->iovnr.init, card->iovnr.max);
2424         if (!left--) {
2425                 int retval;
2426                 retval =
2427                     sprintf(page, "Interrupt counter: %u \n", card->intcnt);
2428                 card->intcnt = 0;
2429                 return retval;
2430         }
2431 #if 0
2432         /* Dump 25.6 Mbps PHY registers */
2433         /* Now there's a 25.6 Mbps PHY driver this code isn't needed. I left it
2434            here just in case it's needed for debugging. */
2435         if (card->max_pcr == ATM_25_PCR && !left--) {
2436                 u32 phy_regs[4];
2437                 u32 i;
2438 
2439                 for (i = 0; i < 4; i++) {
2440                         while (CMD_BUSY(card)) ;
2441                         writel(NS_CMD_READ_UTILITY | 0x00000200 | i,
2442                                card->membase + CMD);
2443                         while (CMD_BUSY(card)) ;
2444                         phy_regs[i] = readl(card->membase + DR0) & 0x000000FF;
2445                 }
2446 
2447                 return sprintf(page, "PHY regs: 0x%02X 0x%02X 0x%02X 0x%02X \n",
2448                                phy_regs[0], phy_regs[1], phy_regs[2],
2449                                phy_regs[3]);
2450         }
2451 #endif /* 0 - Dump 25.6 Mbps PHY registers */
2452 #if 0
2453         /* Dump TST */
2454         if (left-- < NS_TST_NUM_ENTRIES) {
2455                 if (card->tste2vc[left + 1] == NULL)
2456                         return sprintf(page, "%5d - VBR/UBR \n", left + 1);
2457                 else
2458                         return sprintf(page, "%5d - %d %d \n", left + 1,
2459                                        card->tste2vc[left + 1]->tx_vcc->vpi,
2460                                        card->tste2vc[left + 1]->tx_vcc->vci);
2461         }
2462 #endif /* 0 */
2463         return 0;
2464 }
2465 
2466 static int ns_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg)
2467 {
2468         ns_dev *card;
2469         pool_levels pl;
2470         long btype;
2471         unsigned long flags;
2472 
2473         card = dev->dev_data;
2474         switch (cmd) {
2475         case NS_GETPSTAT:
2476                 if (get_user
2477                     (pl.buftype, &((pool_levels __user *) arg)->buftype))
2478                         return -EFAULT;
2479                 switch (pl.buftype) {
2480                 case NS_BUFTYPE_SMALL:
2481                         pl.count =
2482                             ns_stat_sfbqc_get(readl(card->membase + STAT));
2483                         pl.level.min = card->sbnr.min;
2484                         pl.level.init = card->sbnr.init;
2485                         pl.level.max = card->sbnr.max;
2486                         break;
2487 
2488                 case NS_BUFTYPE_LARGE:
2489                         pl.count =
2490                             ns_stat_lfbqc_get(readl(card->membase + STAT));
2491                         pl.level.min = card->lbnr.min;
2492                         pl.level.init = card->lbnr.init;
2493                         pl.level.max = card->lbnr.max;
2494                         break;
2495 
2496                 case NS_BUFTYPE_HUGE:
2497                         pl.count = card->hbpool.count;
2498                         pl.level.min = card->hbnr.min;
2499                         pl.level.init = card->hbnr.init;
2500                         pl.level.max = card->hbnr.max;
2501                         break;
2502 
2503                 case NS_BUFTYPE_IOVEC:
2504                         pl.count = card->iovpool.count;
2505                         pl.level.min = card->iovnr.min;
2506                         pl.level.init = card->iovnr.init;
2507                         pl.level.max = card->iovnr.max;
2508                         break;
2509 
2510                 default:
2511                         return -ENOIOCTLCMD;
2512 
2513                 }
2514                 if (!copy_to_user((pool_levels __user *) arg, &pl, sizeof(pl)))
2515                         return (sizeof(pl));
2516                 else
2517                         return -EFAULT;
2518 
2519         case NS_SETBUFLEV:
2520                 if (!capable(CAP_NET_ADMIN))
2521                         return -EPERM;
2522                 if (copy_from_user(&pl, (pool_levels __user *) arg, sizeof(pl)))
2523                         return -EFAULT;
2524                 if (pl.level.min >= pl.level.init
2525                     || pl.level.init >= pl.level.max)
2526                         return -EINVAL;
2527                 if (pl.level.min == 0)
2528                         return -EINVAL;
2529                 switch (pl.buftype) {
2530                 case NS_BUFTYPE_SMALL:
2531                         if (pl.level.max > TOP_SB)
2532                                 return -EINVAL;
2533                         card->sbnr.min = pl.level.min;
2534                         card->sbnr.init = pl.level.init;
2535                         card->sbnr.max = pl.level.max;
2536                         break;
2537 
2538                 case NS_BUFTYPE_LARGE:
2539                         if (pl.level.max > TOP_LB)
2540                                 return -EINVAL;
2541                         card->lbnr.min = pl.level.min;
2542                         card->lbnr.init = pl.level.init;
2543                         card->lbnr.max = pl.level.max;
2544                         break;
2545 
2546                 case NS_BUFTYPE_HUGE:
2547                         if (pl.level.max > TOP_HB)
2548                                 return -EINVAL;
2549                         card->hbnr.min = pl.level.min;
2550                         card->hbnr.init = pl.level.init;
2551                         card->hbnr.max = pl.level.max;
2552                         break;
2553 
2554                 case NS_BUFTYPE_IOVEC:
2555                         if (pl.level.max > TOP_IOVB)
2556                                 return -EINVAL;
2557                         card->iovnr.min = pl.level.min;
2558                         card->iovnr.init = pl.level.init;
2559                         card->iovnr.max = pl.level.max;
2560                         break;
2561 
2562                 default:
2563                         return -EINVAL;
2564 
2565                 }
2566                 return 0;
2567 
2568         case NS_ADJBUFLEV:
2569                 if (!capable(CAP_NET_ADMIN))
2570                         return -EPERM;
2571                 btype = (long)arg;      /* a long is the same size as a pointer or bigger */
2572                 switch (btype) {
2573                 case NS_BUFTYPE_SMALL:
2574                         while (card->sbfqc < card->sbnr.init) {
2575                                 struct sk_buff *sb;
2576 
2577                                 sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
2578                                 if (sb == NULL)
2579                                         return -ENOMEM;
2580                                 NS_PRV_BUFTYPE(sb) = BUF_SM;
2581                                 skb_queue_tail(&card->sbpool.queue, sb);
2582                                 skb_reserve(sb, NS_AAL0_HEADER);
2583                                 push_rxbufs(card, sb);
2584                         }
2585                         break;
2586 
2587                 case NS_BUFTYPE_LARGE:
2588                         while (card->lbfqc < card->lbnr.init) {
2589                                 struct sk_buff *lb;
2590 
2591                                 lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
2592                                 if (lb == NULL)
2593                                         return -ENOMEM;
2594                                 NS_PRV_BUFTYPE(lb) = BUF_LG;
2595                                 skb_queue_tail(&card->lbpool.queue, lb);
2596                                 skb_reserve(lb, NS_SMBUFSIZE);
2597                                 push_rxbufs(card, lb);
2598                         }
2599                         break;
2600 
2601                 case NS_BUFTYPE_HUGE:
2602                         while (card->hbpool.count > card->hbnr.init) {
2603                                 struct sk_buff *hb;
2604 
2605                                 spin_lock_irqsave(&card->int_lock, flags);
2606                                 hb = skb_dequeue(&card->hbpool.queue);
2607                                 card->hbpool.count--;
2608                                 spin_unlock_irqrestore(&card->int_lock, flags);
2609                                 if (hb == NULL)
2610                                         printk
2611                                             ("nicstar%d: huge buffer count inconsistent.\n",
2612                                              card->index);
2613                                 else
2614                                         dev_kfree_skb_any(hb);
2615 
2616                         }
2617                         while (card->hbpool.count < card->hbnr.init) {
2618                                 struct sk_buff *hb;
2619 
2620                                 hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
2621                                 if (hb == NULL)
2622                                         return -ENOMEM;
2623                                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
2624                                 spin_lock_irqsave(&card->int_lock, flags);
2625                                 skb_queue_tail(&card->hbpool.queue, hb);
2626                                 card->hbpool.count++;
2627                                 spin_unlock_irqrestore(&card->int_lock, flags);
2628                         }
2629                         break;
2630 
2631                 case NS_BUFTYPE_IOVEC:
2632                         while (card->iovpool.count > card->iovnr.init) {
2633                                 struct sk_buff *iovb;
2634 
2635                                 spin_lock_irqsave(&card->int_lock, flags);
2636                                 iovb = skb_dequeue(&card->iovpool.queue);
2637                                 card->iovpool.count--;
2638                                 spin_unlock_irqrestore(&card->int_lock, flags);
2639                                 if (iovb == NULL)
2640                                         printk
2641                                             ("nicstar%d: iovec buffer count inconsistent.\n",
2642                                              card->index);
2643                                 else
2644                                         dev_kfree_skb_any(iovb);
2645 
2646                         }
2647                         while (card->iovpool.count < card->iovnr.init) {
2648                                 struct sk_buff *iovb;
2649 
2650                                 iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
2651                                 if (iovb == NULL)
2652                                         return -ENOMEM;
2653                                 NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2654                                 spin_lock_irqsave(&card->int_lock, flags);
2655                                 skb_queue_tail(&card->iovpool.queue, iovb);
2656                                 card->iovpool.count++;
2657                                 spin_unlock_irqrestore(&card->int_lock, flags);
2658                         }
2659                         break;
2660 
2661                 default:
2662                         return -EINVAL;
2663 
2664                 }
2665                 return 0;
2666 
2667         default:
2668                 if (dev->phy && dev->phy->ioctl) {
2669                         return dev->phy->ioctl(dev, cmd, arg);
2670                 } else {
2671                         printk("nicstar%d: %s == NULL \n", card->index,
2672                                dev->phy ? "dev->phy->ioctl" : "dev->phy");
2673                         return -ENOIOCTLCMD;
2674                 }
2675         }
2676 }
2677 
2678 #ifdef EXTRA_DEBUG
2679 static void which_list(ns_dev * card, struct sk_buff *skb)
2680 {
2681         printk("skb buf_type: 0x%08x\n", NS_PRV_BUFTYPE(skb));
2682 }
2683 #endif /* EXTRA_DEBUG */
2684 
2685 static void ns_poll(unsigned long arg)
2686 {
2687         int i;
2688         ns_dev *card;
2689         unsigned long flags;
2690         u32 stat_r, stat_w;
2691 
2692         PRINTK("nicstar: Entering ns_poll().\n");
2693         for (i = 0; i < num_cards; i++) {
2694                 card = cards[i];
2695                 if (spin_is_locked(&card->int_lock)) {
2696                         /* Probably it isn't worth spinning */
2697                         continue;
2698                 }
2699                 spin_lock_irqsave(&card->int_lock, flags);
2700 
2701                 stat_w = 0;
2702                 stat_r = readl(card->membase + STAT);
2703                 if (stat_r & NS_STAT_TSIF)
2704                         stat_w |= NS_STAT_TSIF;
2705                 if (stat_r & NS_STAT_EOPDU)
2706                         stat_w |= NS_STAT_EOPDU;
2707 
2708                 process_tsq(card);
2709                 process_rsq(card);
2710 
2711                 writel(stat_w, card->membase + STAT);
2712                 spin_unlock_irqrestore(&card->int_lock, flags);
2713         }
2714         mod_timer(&ns_timer, jiffies + NS_POLL_PERIOD);
2715         PRINTK("nicstar: Leaving ns_poll().\n");
2716 }
2717 
2718 static void ns_phy_put(struct atm_dev *dev, unsigned char value,
2719                        unsigned long addr)
2720 {
2721         ns_dev *card;
2722         unsigned long flags;
2723 
2724         card = dev->dev_data;
2725         spin_lock_irqsave(&card->res_lock, flags);
2726         while (CMD_BUSY(card)) ;
2727         writel((u32) value, card->membase + DR0);
2728         writel(NS_CMD_WRITE_UTILITY | 0x00000200 | (addr & 0x000000FF),
2729                card->membase + CMD);
2730         spin_unlock_irqrestore(&card->res_lock, flags);
2731 }
2732 
2733 static unsigned char ns_phy_get(struct atm_dev *dev, unsigned long addr)
2734 {
2735         ns_dev *card;
2736         unsigned long flags;
2737         u32 data;
2738 
2739         card = dev->dev_data;
2740         spin_lock_irqsave(&card->res_lock, flags);
2741         while (CMD_BUSY(card)) ;
2742         writel(NS_CMD_READ_UTILITY | 0x00000200 | (addr & 0x000000FF),
2743                card->membase + CMD);
2744         while (CMD_BUSY(card)) ;
2745         data = readl(card->membase + DR0) & 0x000000FF;
2746         spin_unlock_irqrestore(&card->res_lock, flags);
2747         return (unsigned char)data;
2748 }
2749 
2750 module_init(nicstar_init);
2751 module_exit(nicstar_cleanup);
2752 

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