1/* 2 * drivers/net/wan/dscc4/dscc4.c: a DSCC4 HDLC driver for Linux 3 * 4 * This software may be used and distributed according to the terms of the 5 * GNU General Public License. 6 * 7 * The author may be reached as romieu@cogenit.fr. 8 * Specific bug reports/asian food will be welcome. 9 * 10 * Special thanks to the nice people at CS-Telecom for the hardware and the 11 * access to the test/measure tools. 12 * 13 * 14 * Theory of Operation 15 * 16 * I. Board Compatibility 17 * 18 * This device driver is designed for the Siemens PEB20534 4 ports serial 19 * controller as found on Etinc PCISYNC cards. The documentation for the 20 * chipset is available at http://www.infineon.com: 21 * - Data Sheet "DSCC4, DMA Supported Serial Communication Controller with 22 * 4 Channels, PEB 20534 Version 2.1, PEF 20534 Version 2.1"; 23 * - Application Hint "Management of DSCC4 on-chip FIFO resources". 24 * - Errata sheet DS5 (courtesy of Michael Skerritt). 25 * Jens David has built an adapter based on the same chipset. Take a look 26 * at http://www.afthd.tu-darmstadt.de/~dg1kjd/pciscc4 for a specific 27 * driver. 28 * Sample code (2 revisions) is available at Infineon. 29 * 30 * II. Board-specific settings 31 * 32 * Pcisync can transmit some clock signal to the outside world on the 33 * *first two* ports provided you put a quartz and a line driver on it and 34 * remove the jumpers. The operation is described on Etinc web site. If you 35 * go DCE on these ports, don't forget to use an adequate cable. 36 * 37 * Sharing of the PCI interrupt line for this board is possible. 38 * 39 * III. Driver operation 40 * 41 * The rx/tx operations are based on a linked list of descriptors. The driver 42 * doesn't use HOLD mode any more. HOLD mode is definitely buggy and the more 43 * I tried to fix it, the more it started to look like (convoluted) software 44 * mutation of LxDA method. Errata sheet DS5 suggests to use LxDA: consider 45 * this a rfc2119 MUST. 46 * 47 * Tx direction 48 * When the tx ring is full, the xmit routine issues a call to netdev_stop. 49 * The device is supposed to be enabled again during an ALLS irq (we could 50 * use HI but as it's easy to lose events, it's fscked). 51 * 52 * Rx direction 53 * The received frames aren't supposed to span over multiple receiving areas. 54 * I may implement it some day but it isn't the highest ranked item. 55 * 56 * IV. Notes 57 * The current error (XDU, RFO) recovery code is untested. 58 * So far, RDO takes his RX channel down and the right sequence to enable it 59 * again is still a mystery. If RDO happens, plan a reboot. More details 60 * in the code (NB: as this happens, TX still works). 61 * Don't mess the cables during operation, especially on DTE ports. I don't 62 * suggest it for DCE either but at least one can get some messages instead 63 * of a complete instant freeze. 64 * Tests are done on Rev. 20 of the silicium. The RDO handling changes with 65 * the documentation/chipset releases. 66 * 67 * TODO: 68 * - test X25. 69 * - use polling at high irq/s, 70 * - performance analysis, 71 * - endianness. 72 * 73 * 2001/12/10 Daniela Squassoni <daniela@cyclades.com> 74 * - Contribution to support the new generic HDLC layer. 75 * 76 * 2002/01 Ueimor 77 * - old style interface removal 78 * - dscc4_release_ring fix (related to DMA mapping) 79 * - hard_start_xmit fix (hint: TxSizeMax) 80 * - misc crapectomy. 81 */ 82 83#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 84 85#include <linux/module.h> 86#include <linux/sched.h> 87#include <linux/types.h> 88#include <linux/errno.h> 89#include <linux/list.h> 90#include <linux/ioport.h> 91#include <linux/pci.h> 92#include <linux/kernel.h> 93#include <linux/mm.h> 94#include <linux/slab.h> 95 96#include <asm/cache.h> 97#include <asm/byteorder.h> 98#include <asm/uaccess.h> 99#include <asm/io.h> 100#include <asm/irq.h> 101 102#include <linux/init.h> 103#include <linux/interrupt.h> 104#include <linux/string.h> 105 106#include <linux/if_arp.h> 107#include <linux/netdevice.h> 108#include <linux/skbuff.h> 109#include <linux/delay.h> 110#include <linux/hdlc.h> 111#include <linux/mutex.h> 112 113/* Version */ 114static const char version[] = "$Id: dscc4.c,v 1.173 2003/09/20 23:55:34 romieu Exp $ for Linux\n"; 115static int debug; 116static int quartz; 117 118#ifdef CONFIG_DSCC4_PCI_RST 119static DEFINE_MUTEX(dscc4_mutex); 120static u32 dscc4_pci_config_store[16]; 121#endif 122 123#define DRV_NAME "dscc4" 124 125#undef DSCC4_POLLING 126 127/* Module parameters */ 128 129MODULE_AUTHOR("Maintainer: Francois Romieu <romieu@cogenit.fr>"); 130MODULE_DESCRIPTION("Siemens PEB20534 PCI Controller"); 131MODULE_LICENSE("GPL"); 132module_param(debug, int, 0); 133MODULE_PARM_DESC(debug,"Enable/disable extra messages"); 134module_param(quartz, int, 0); 135MODULE_PARM_DESC(quartz,"If present, on-board quartz frequency (Hz)"); 136 137/* Structures */ 138 139struct thingie { 140 int define; 141 u32 bits; 142}; 143 144struct TxFD { 145 __le32 state; 146 __le32 next; 147 __le32 data; 148 __le32 complete; 149 u32 jiffies; /* Allows sizeof(TxFD) == sizeof(RxFD) + extra hack */ 150 /* FWIW, datasheet calls that "dummy" and says that card 151 * never looks at it; neither does the driver */ 152}; 153 154struct RxFD { 155 __le32 state1; 156 __le32 next; 157 __le32 data; 158 __le32 state2; 159 __le32 end; 160}; 161 162#define DUMMY_SKB_SIZE 64 163#define TX_LOW 8 164#define TX_RING_SIZE 32 165#define RX_RING_SIZE 32 166#define TX_TOTAL_SIZE TX_RING_SIZE*sizeof(struct TxFD) 167#define RX_TOTAL_SIZE RX_RING_SIZE*sizeof(struct RxFD) 168#define IRQ_RING_SIZE 64 /* Keep it a multiple of 32 */ 169#define TX_TIMEOUT (HZ/10) 170#define DSCC4_HZ_MAX 33000000 171#define BRR_DIVIDER_MAX 64*0x00004000 /* Cf errata DS5 p.10 */ 172#define dev_per_card 4 173#define SCC_REGISTERS_MAX 23 /* Cf errata DS5 p.4 */ 174 175#define SOURCE_ID(flags) (((flags) >> 28) & 0x03) 176#define TO_SIZE(state) (((state) >> 16) & 0x1fff) 177 178/* 179 * Given the operating range of Linux HDLC, the 2 defines below could be 180 * made simpler. However they are a fine reminder for the limitations of 181 * the driver: it's better to stay < TxSizeMax and < RxSizeMax. 182 */ 183#define TO_STATE_TX(len) cpu_to_le32(((len) & TxSizeMax) << 16) 184#define TO_STATE_RX(len) cpu_to_le32((RX_MAX(len) % RxSizeMax) << 16) 185#define RX_MAX(len) ((((len) >> 5) + 1) << 5) /* Cf RLCR */ 186#define SCC_REG_START(dpriv) (SCC_START+(dpriv->dev_id)*SCC_OFFSET) 187 188struct dscc4_pci_priv { 189 __le32 *iqcfg; 190 int cfg_cur; 191 spinlock_t lock; 192 struct pci_dev *pdev; 193 194 struct dscc4_dev_priv *root; 195 dma_addr_t iqcfg_dma; 196 u32 xtal_hz; 197}; 198 199struct dscc4_dev_priv { 200 struct sk_buff *rx_skbuff[RX_RING_SIZE]; 201 struct sk_buff *tx_skbuff[TX_RING_SIZE]; 202 203 struct RxFD *rx_fd; 204 struct TxFD *tx_fd; 205 __le32 *iqrx; 206 __le32 *iqtx; 207 208 /* FIXME: check all the volatile are required */ 209 volatile u32 tx_current; 210 u32 rx_current; 211 u32 iqtx_current; 212 u32 iqrx_current; 213 214 volatile u32 tx_dirty; 215 volatile u32 ltda; 216 u32 rx_dirty; 217 u32 lrda; 218 219 dma_addr_t tx_fd_dma; 220 dma_addr_t rx_fd_dma; 221 dma_addr_t iqtx_dma; 222 dma_addr_t iqrx_dma; 223 224 u32 scc_regs[SCC_REGISTERS_MAX]; /* Cf errata DS5 p.4 */ 225 226 struct timer_list timer; 227 228 struct dscc4_pci_priv *pci_priv; 229 spinlock_t lock; 230 231 int dev_id; 232 volatile u32 flags; 233 u32 timer_help; 234 235 unsigned short encoding; 236 unsigned short parity; 237 struct net_device *dev; 238 sync_serial_settings settings; 239 void __iomem *base_addr; 240 u32 __pad __attribute__ ((aligned (4))); 241}; 242 243/* GLOBAL registers definitions */ 244#define GCMDR 0x00 245#define GSTAR 0x04 246#define GMODE 0x08 247#define IQLENR0 0x0C 248#define IQLENR1 0x10 249#define IQRX0 0x14 250#define IQTX0 0x24 251#define IQCFG 0x3c 252#define FIFOCR1 0x44 253#define FIFOCR2 0x48 254#define FIFOCR3 0x4c 255#define FIFOCR4 0x34 256#define CH0CFG 0x50 257#define CH0BRDA 0x54 258#define CH0BTDA 0x58 259#define CH0FRDA 0x98 260#define CH0FTDA 0xb0 261#define CH0LRDA 0xc8 262#define CH0LTDA 0xe0 263 264/* SCC registers definitions */ 265#define SCC_START 0x0100 266#define SCC_OFFSET 0x80 267#define CMDR 0x00 268#define STAR 0x04 269#define CCR0 0x08 270#define CCR1 0x0c 271#define CCR2 0x10 272#define BRR 0x2C 273#define RLCR 0x40 274#define IMR 0x54 275#define ISR 0x58 276 277#define GPDIR 0x0400 278#define GPDATA 0x0404 279#define GPIM 0x0408 280 281/* Bit masks */ 282#define EncodingMask 0x00700000 283#define CrcMask 0x00000003 284 285#define IntRxScc0 0x10000000 286#define IntTxScc0 0x01000000 287 288#define TxPollCmd 0x00000400 289#define RxActivate 0x08000000 290#define MTFi 0x04000000 291#define Rdr 0x00400000 292#define Rdt 0x00200000 293#define Idr 0x00100000 294#define Idt 0x00080000 295#define TxSccRes 0x01000000 296#define RxSccRes 0x00010000 297#define TxSizeMax 0x1fff /* Datasheet DS1 - 11.1.1.1 */ 298#define RxSizeMax 0x1ffc /* Datasheet DS1 - 11.1.2.1 */ 299 300#define Ccr0ClockMask 0x0000003f 301#define Ccr1LoopMask 0x00000200 302#define IsrMask 0x000fffff 303#define BrrExpMask 0x00000f00 304#define BrrMultMask 0x0000003f 305#define EncodingMask 0x00700000 306#define Hold cpu_to_le32(0x40000000) 307#define SccBusy 0x10000000 308#define PowerUp 0x80000000 309#define Vis 0x00001000 310#define FrameOk (FrameVfr | FrameCrc) 311#define FrameVfr 0x80 312#define FrameRdo 0x40 313#define FrameCrc 0x20 314#define FrameRab 0x10 315#define FrameAborted cpu_to_le32(0x00000200) 316#define FrameEnd cpu_to_le32(0x80000000) 317#define DataComplete cpu_to_le32(0x40000000) 318#define LengthCheck 0x00008000 319#define SccEvt 0x02000000 320#define NoAck 0x00000200 321#define Action 0x00000001 322#define HiDesc cpu_to_le32(0x20000000) 323 324/* SCC events */ 325#define RxEvt 0xf0000000 326#define TxEvt 0x0f000000 327#define Alls 0x00040000 328#define Xdu 0x00010000 329#define Cts 0x00004000 330#define Xmr 0x00002000 331#define Xpr 0x00001000 332#define Rdo 0x00000080 333#define Rfs 0x00000040 334#define Cd 0x00000004 335#define Rfo 0x00000002 336#define Flex 0x00000001 337 338/* DMA core events */ 339#define Cfg 0x00200000 340#define Hi 0x00040000 341#define Fi 0x00020000 342#define Err 0x00010000 343#define Arf 0x00000002 344#define ArAck 0x00000001 345 346/* State flags */ 347#define Ready 0x00000000 348#define NeedIDR 0x00000001 349#define NeedIDT 0x00000002 350#define RdoSet 0x00000004 351#define FakeReset 0x00000008 352 353/* Don't mask RDO. Ever. */ 354#ifdef DSCC4_POLLING 355#define EventsMask 0xfffeef7f 356#else 357#define EventsMask 0xfffa8f7a 358#endif 359 360/* Functions prototypes */ 361static void dscc4_rx_irq(struct dscc4_pci_priv *, struct dscc4_dev_priv *); 362static void dscc4_tx_irq(struct dscc4_pci_priv *, struct dscc4_dev_priv *); 363static int dscc4_found1(struct pci_dev *, void __iomem *ioaddr); 364static int dscc4_init_one(struct pci_dev *, const struct pci_device_id *ent); 365static int dscc4_open(struct net_device *); 366static netdev_tx_t dscc4_start_xmit(struct sk_buff *, 367 struct net_device *); 368static int dscc4_close(struct net_device *); 369static int dscc4_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 370static int dscc4_init_ring(struct net_device *); 371static void dscc4_release_ring(struct dscc4_dev_priv *); 372static void dscc4_timer(unsigned long); 373static void dscc4_tx_timeout(struct net_device *); 374static irqreturn_t dscc4_irq(int irq, void *dev_id); 375static int dscc4_hdlc_attach(struct net_device *, unsigned short, unsigned short); 376static int dscc4_set_iface(struct dscc4_dev_priv *, struct net_device *); 377#ifdef DSCC4_POLLING 378static int dscc4_tx_poll(struct dscc4_dev_priv *, struct net_device *); 379#endif 380 381static inline struct dscc4_dev_priv *dscc4_priv(struct net_device *dev) 382{ 383 return dev_to_hdlc(dev)->priv; 384} 385 386static inline struct net_device *dscc4_to_dev(struct dscc4_dev_priv *p) 387{ 388 return p->dev; 389} 390 391static void scc_patchl(u32 mask, u32 value, struct dscc4_dev_priv *dpriv, 392 struct net_device *dev, int offset) 393{ 394 u32 state; 395 396 /* Cf scc_writel for concern regarding thread-safety */ 397 state = dpriv->scc_regs[offset >> 2]; 398 state &= ~mask; 399 state |= value; 400 dpriv->scc_regs[offset >> 2] = state; 401 writel(state, dpriv->base_addr + SCC_REG_START(dpriv) + offset); 402} 403 404static void scc_writel(u32 bits, struct dscc4_dev_priv *dpriv, 405 struct net_device *dev, int offset) 406{ 407 /* 408 * Thread-UNsafe. 409 * As of 2002/02/16, there are no thread racing for access. 410 */ 411 dpriv->scc_regs[offset >> 2] = bits; 412 writel(bits, dpriv->base_addr + SCC_REG_START(dpriv) + offset); 413} 414 415static inline u32 scc_readl(struct dscc4_dev_priv *dpriv, int offset) 416{ 417 return dpriv->scc_regs[offset >> 2]; 418} 419 420static u32 scc_readl_star(struct dscc4_dev_priv *dpriv, struct net_device *dev) 421{ 422 /* Cf errata DS5 p.4 */ 423 readl(dpriv->base_addr + SCC_REG_START(dpriv) + STAR); 424 return readl(dpriv->base_addr + SCC_REG_START(dpriv) + STAR); 425} 426 427static inline void dscc4_do_tx(struct dscc4_dev_priv *dpriv, 428 struct net_device *dev) 429{ 430 dpriv->ltda = dpriv->tx_fd_dma + 431 ((dpriv->tx_current-1)%TX_RING_SIZE)*sizeof(struct TxFD); 432 writel(dpriv->ltda, dpriv->base_addr + CH0LTDA + dpriv->dev_id*4); 433 /* Flush posted writes *NOW* */ 434 readl(dpriv->base_addr + CH0LTDA + dpriv->dev_id*4); 435} 436 437static inline void dscc4_rx_update(struct dscc4_dev_priv *dpriv, 438 struct net_device *dev) 439{ 440 dpriv->lrda = dpriv->rx_fd_dma + 441 ((dpriv->rx_dirty - 1)%RX_RING_SIZE)*sizeof(struct RxFD); 442 writel(dpriv->lrda, dpriv->base_addr + CH0LRDA + dpriv->dev_id*4); 443} 444 445static inline unsigned int dscc4_tx_done(struct dscc4_dev_priv *dpriv) 446{ 447 return dpriv->tx_current == dpriv->tx_dirty; 448} 449 450static inline unsigned int dscc4_tx_quiescent(struct dscc4_dev_priv *dpriv, 451 struct net_device *dev) 452{ 453 return readl(dpriv->base_addr + CH0FTDA + dpriv->dev_id*4) == dpriv->ltda; 454} 455 456static int state_check(u32 state, struct dscc4_dev_priv *dpriv, 457 struct net_device *dev, const char *msg) 458{ 459 int ret = 0; 460 461 if (debug > 1) { 462 if (SOURCE_ID(state) != dpriv->dev_id) { 463 printk(KERN_DEBUG "%s (%s): Source Id=%d, state=%08x\n", 464 dev->name, msg, SOURCE_ID(state), state ); 465 ret = -1; 466 } 467 if (state & 0x0df80c00) { 468 printk(KERN_DEBUG "%s (%s): state=%08x (UFO alert)\n", 469 dev->name, msg, state); 470 ret = -1; 471 } 472 } 473 return ret; 474} 475 476static void dscc4_tx_print(struct net_device *dev, 477 struct dscc4_dev_priv *dpriv, 478 char *msg) 479{ 480 printk(KERN_DEBUG "%s: tx_current=%02d tx_dirty=%02d (%s)\n", 481 dev->name, dpriv->tx_current, dpriv->tx_dirty, msg); 482} 483 484static void dscc4_release_ring(struct dscc4_dev_priv *dpriv) 485{ 486 struct pci_dev *pdev = dpriv->pci_priv->pdev; 487 struct TxFD *tx_fd = dpriv->tx_fd; 488 struct RxFD *rx_fd = dpriv->rx_fd; 489 struct sk_buff **skbuff; 490 int i; 491 492 pci_free_consistent(pdev, TX_TOTAL_SIZE, tx_fd, dpriv->tx_fd_dma); 493 pci_free_consistent(pdev, RX_TOTAL_SIZE, rx_fd, dpriv->rx_fd_dma); 494 495 skbuff = dpriv->tx_skbuff; 496 for (i = 0; i < TX_RING_SIZE; i++) { 497 if (*skbuff) { 498 pci_unmap_single(pdev, le32_to_cpu(tx_fd->data), 499 (*skbuff)->len, PCI_DMA_TODEVICE); 500 dev_kfree_skb(*skbuff); 501 } 502 skbuff++; 503 tx_fd++; 504 } 505 506 skbuff = dpriv->rx_skbuff; 507 for (i = 0; i < RX_RING_SIZE; i++) { 508 if (*skbuff) { 509 pci_unmap_single(pdev, le32_to_cpu(rx_fd->data), 510 RX_MAX(HDLC_MAX_MRU), PCI_DMA_FROMDEVICE); 511 dev_kfree_skb(*skbuff); 512 } 513 skbuff++; 514 rx_fd++; 515 } 516} 517 518static inline int try_get_rx_skb(struct dscc4_dev_priv *dpriv, 519 struct net_device *dev) 520{ 521 unsigned int dirty = dpriv->rx_dirty%RX_RING_SIZE; 522 struct RxFD *rx_fd = dpriv->rx_fd + dirty; 523 const int len = RX_MAX(HDLC_MAX_MRU); 524 struct sk_buff *skb; 525 int ret = 0; 526 527 skb = dev_alloc_skb(len); 528 dpriv->rx_skbuff[dirty] = skb; 529 if (skb) { 530 skb->protocol = hdlc_type_trans(skb, dev); 531 rx_fd->data = cpu_to_le32(pci_map_single(dpriv->pci_priv->pdev, 532 skb->data, len, PCI_DMA_FROMDEVICE)); 533 } else { 534 rx_fd->data = 0; 535 ret = -1; 536 } 537 return ret; 538} 539 540/* 541 * IRQ/thread/whatever safe 542 */ 543static int dscc4_wait_ack_cec(struct dscc4_dev_priv *dpriv, 544 struct net_device *dev, char *msg) 545{ 546 s8 i = 0; 547 548 do { 549 if (!(scc_readl_star(dpriv, dev) & SccBusy)) { 550 printk(KERN_DEBUG "%s: %s ack (%d try)\n", dev->name, 551 msg, i); 552 goto done; 553 } 554 schedule_timeout_uninterruptible(msecs_to_jiffies(100)); 555 rmb(); 556 } while (++i > 0); 557 netdev_err(dev, "%s timeout\n", msg); 558done: 559 return (i >= 0) ? i : -EAGAIN; 560} 561 562static int dscc4_do_action(struct net_device *dev, char *msg) 563{ 564 void __iomem *ioaddr = dscc4_priv(dev)->base_addr; 565 s16 i = 0; 566 567 writel(Action, ioaddr + GCMDR); 568 ioaddr += GSTAR; 569 do { 570 u32 state = readl(ioaddr); 571 572 if (state & ArAck) { 573 netdev_dbg(dev, "%s ack\n", msg); 574 writel(ArAck, ioaddr); 575 goto done; 576 } else if (state & Arf) { 577 netdev_err(dev, "%s failed\n", msg); 578 writel(Arf, ioaddr); 579 i = -1; 580 goto done; 581 } 582 rmb(); 583 } while (++i > 0); 584 netdev_err(dev, "%s timeout\n", msg); 585done: 586 return i; 587} 588 589static inline int dscc4_xpr_ack(struct dscc4_dev_priv *dpriv) 590{ 591 int cur = dpriv->iqtx_current%IRQ_RING_SIZE; 592 s8 i = 0; 593 594 do { 595 if (!(dpriv->flags & (NeedIDR | NeedIDT)) || 596 (dpriv->iqtx[cur] & cpu_to_le32(Xpr))) 597 break; 598 smp_rmb(); 599 schedule_timeout_uninterruptible(msecs_to_jiffies(100)); 600 } while (++i > 0); 601 602 return (i >= 0 ) ? i : -EAGAIN; 603} 604 605#if 0 /* dscc4_{rx/tx}_reset are both unreliable - more tweak needed */ 606static void dscc4_rx_reset(struct dscc4_dev_priv *dpriv, struct net_device *dev) 607{ 608 unsigned long flags; 609 610 spin_lock_irqsave(&dpriv->pci_priv->lock, flags); 611 /* Cf errata DS5 p.6 */ 612 writel(0x00000000, dpriv->base_addr + CH0LRDA + dpriv->dev_id*4); 613 scc_patchl(PowerUp, 0, dpriv, dev, CCR0); 614 readl(dpriv->base_addr + CH0LRDA + dpriv->dev_id*4); 615 writel(MTFi|Rdr, dpriv->base_addr + dpriv->dev_id*0x0c + CH0CFG); 616 writel(Action, dpriv->base_addr + GCMDR); 617 spin_unlock_irqrestore(&dpriv->pci_priv->lock, flags); 618} 619 620#endif 621 622#if 0 623static void dscc4_tx_reset(struct dscc4_dev_priv *dpriv, struct net_device *dev) 624{ 625 u16 i = 0; 626 627 /* Cf errata DS5 p.7 */ 628 scc_patchl(PowerUp, 0, dpriv, dev, CCR0); 629 scc_writel(0x00050000, dpriv, dev, CCR2); 630 /* 631 * Must be longer than the time required to fill the fifo. 632 */ 633 while (!dscc4_tx_quiescent(dpriv, dev) && ++i) { 634 udelay(1); 635 wmb(); 636 } 637 638 writel(MTFi|Rdt, dpriv->base_addr + dpriv->dev_id*0x0c + CH0CFG); 639 if (dscc4_do_action(dev, "Rdt") < 0) 640 netdev_err(dev, "Tx reset failed\n"); 641} 642#endif 643 644/* TODO: (ab)use this function to refill a completely depleted RX ring. */ 645static inline void dscc4_rx_skb(struct dscc4_dev_priv *dpriv, 646 struct net_device *dev) 647{ 648 struct RxFD *rx_fd = dpriv->rx_fd + dpriv->rx_current%RX_RING_SIZE; 649 struct pci_dev *pdev = dpriv->pci_priv->pdev; 650 struct sk_buff *skb; 651 int pkt_len; 652 653 skb = dpriv->rx_skbuff[dpriv->rx_current++%RX_RING_SIZE]; 654 if (!skb) { 655 printk(KERN_DEBUG "%s: skb=0 (%s)\n", dev->name, __func__); 656 goto refill; 657 } 658 pkt_len = TO_SIZE(le32_to_cpu(rx_fd->state2)); 659 pci_unmap_single(pdev, le32_to_cpu(rx_fd->data), 660 RX_MAX(HDLC_MAX_MRU), PCI_DMA_FROMDEVICE); 661 if ((skb->data[--pkt_len] & FrameOk) == FrameOk) { 662 dev->stats.rx_packets++; 663 dev->stats.rx_bytes += pkt_len; 664 skb_put(skb, pkt_len); 665 if (netif_running(dev)) 666 skb->protocol = hdlc_type_trans(skb, dev); 667 netif_rx(skb); 668 } else { 669 if (skb->data[pkt_len] & FrameRdo) 670 dev->stats.rx_fifo_errors++; 671 else if (!(skb->data[pkt_len] & FrameCrc)) 672 dev->stats.rx_crc_errors++; 673 else if ((skb->data[pkt_len] & (FrameVfr | FrameRab)) != 674 (FrameVfr | FrameRab)) 675 dev->stats.rx_length_errors++; 676 dev->stats.rx_errors++; 677 dev_kfree_skb_irq(skb); 678 } 679refill: 680 while ((dpriv->rx_dirty - dpriv->rx_current) % RX_RING_SIZE) { 681 if (try_get_rx_skb(dpriv, dev) < 0) 682 break; 683 dpriv->rx_dirty++; 684 } 685 dscc4_rx_update(dpriv, dev); 686 rx_fd->state2 = 0x00000000; 687 rx_fd->end = cpu_to_le32(0xbabeface); 688} 689 690static void dscc4_free1(struct pci_dev *pdev) 691{ 692 struct dscc4_pci_priv *ppriv; 693 struct dscc4_dev_priv *root; 694 int i; 695 696 ppriv = pci_get_drvdata(pdev); 697 root = ppriv->root; 698 699 for (i = 0; i < dev_per_card; i++) 700 unregister_hdlc_device(dscc4_to_dev(root + i)); 701 702 for (i = 0; i < dev_per_card; i++) 703 free_netdev(root[i].dev); 704 kfree(root); 705 kfree(ppriv); 706} 707 708static int dscc4_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) 709{ 710 struct dscc4_pci_priv *priv; 711 struct dscc4_dev_priv *dpriv; 712 void __iomem *ioaddr; 713 int i, rc; 714 715 printk(KERN_DEBUG "%s", version); 716 717 rc = pci_enable_device(pdev); 718 if (rc < 0) 719 goto out; 720 721 rc = pci_request_region(pdev, 0, "registers"); 722 if (rc < 0) { 723 pr_err("can't reserve MMIO region (regs)\n"); 724 goto err_disable_0; 725 } 726 rc = pci_request_region(pdev, 1, "LBI interface"); 727 if (rc < 0) { 728 pr_err("can't reserve MMIO region (lbi)\n"); 729 goto err_free_mmio_region_1; 730 } 731 732 ioaddr = pci_ioremap_bar(pdev, 0); 733 if (!ioaddr) { 734 pr_err("cannot remap MMIO region %llx @ %llx\n", 735 (unsigned long long)pci_resource_len(pdev, 0), 736 (unsigned long long)pci_resource_start(pdev, 0)); 737 rc = -EIO; 738 goto err_free_mmio_regions_2; 739 } 740 printk(KERN_DEBUG "Siemens DSCC4, MMIO at %#llx (regs), %#llx (lbi), IRQ %d\n", 741 (unsigned long long)pci_resource_start(pdev, 0), 742 (unsigned long long)pci_resource_start(pdev, 1), pdev->irq); 743 744 /* Cf errata DS5 p.2 */ 745 pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0xf8); 746 pci_set_master(pdev); 747 748 rc = dscc4_found1(pdev, ioaddr); 749 if (rc < 0) 750 goto err_iounmap_3; 751 752 priv = pci_get_drvdata(pdev); 753 754 rc = request_irq(pdev->irq, dscc4_irq, IRQF_SHARED, DRV_NAME, priv->root); 755 if (rc < 0) { 756 pr_warn("IRQ %d busy\n", pdev->irq); 757 goto err_release_4; 758 } 759 760 /* power up/little endian/dma core controlled via lrda/ltda */ 761 writel(0x00000001, ioaddr + GMODE); 762 /* Shared interrupt queue */ 763 { 764 u32 bits; 765 766 bits = (IRQ_RING_SIZE >> 5) - 1; 767 bits |= bits << 4; 768 bits |= bits << 8; 769 bits |= bits << 16; 770 writel(bits, ioaddr + IQLENR0); 771 } 772 /* Global interrupt queue */ 773 writel((u32)(((IRQ_RING_SIZE >> 5) - 1) << 20), ioaddr + IQLENR1); 774 775 rc = -ENOMEM; 776 777 priv->iqcfg = (__le32 *) pci_alloc_consistent(pdev, 778 IRQ_RING_SIZE*sizeof(__le32), &priv->iqcfg_dma); 779 if (!priv->iqcfg) 780 goto err_free_irq_5; 781 writel(priv->iqcfg_dma, ioaddr + IQCFG); 782 783 /* 784 * SCC 0-3 private rx/tx irq structures 785 * IQRX/TXi needs to be set soon. Learned it the hard way... 786 */ 787 for (i = 0; i < dev_per_card; i++) { 788 dpriv = priv->root + i; 789 dpriv->iqtx = (__le32 *) pci_alloc_consistent(pdev, 790 IRQ_RING_SIZE*sizeof(u32), &dpriv->iqtx_dma); 791 if (!dpriv->iqtx) 792 goto err_free_iqtx_6; 793 writel(dpriv->iqtx_dma, ioaddr + IQTX0 + i*4); 794 } 795 for (i = 0; i < dev_per_card; i++) { 796 dpriv = priv->root + i; 797 dpriv->iqrx = (__le32 *) pci_alloc_consistent(pdev, 798 IRQ_RING_SIZE*sizeof(u32), &dpriv->iqrx_dma); 799 if (!dpriv->iqrx) 800 goto err_free_iqrx_7; 801 writel(dpriv->iqrx_dma, ioaddr + IQRX0 + i*4); 802 } 803 804 /* Cf application hint. Beware of hard-lock condition on threshold. */ 805 writel(0x42104000, ioaddr + FIFOCR1); 806 //writel(0x9ce69800, ioaddr + FIFOCR2); 807 writel(0xdef6d800, ioaddr + FIFOCR2); 808 //writel(0x11111111, ioaddr + FIFOCR4); 809 writel(0x18181818, ioaddr + FIFOCR4); 810 // FIXME: should depend on the chipset revision 811 writel(0x0000000e, ioaddr + FIFOCR3); 812 813 writel(0xff200001, ioaddr + GCMDR); 814 815 rc = 0; 816out: 817 return rc; 818 819err_free_iqrx_7: 820 while (--i >= 0) { 821 dpriv = priv->root + i; 822 pci_free_consistent(pdev, IRQ_RING_SIZE*sizeof(u32), 823 dpriv->iqrx, dpriv->iqrx_dma); 824 } 825 i = dev_per_card; 826err_free_iqtx_6: 827 while (--i >= 0) { 828 dpriv = priv->root + i; 829 pci_free_consistent(pdev, IRQ_RING_SIZE*sizeof(u32), 830 dpriv->iqtx, dpriv->iqtx_dma); 831 } 832 pci_free_consistent(pdev, IRQ_RING_SIZE*sizeof(u32), priv->iqcfg, 833 priv->iqcfg_dma); 834err_free_irq_5: 835 free_irq(pdev->irq, priv->root); 836err_release_4: 837 dscc4_free1(pdev); 838err_iounmap_3: 839 iounmap (ioaddr); 840err_free_mmio_regions_2: 841 pci_release_region(pdev, 1); 842err_free_mmio_region_1: 843 pci_release_region(pdev, 0); 844err_disable_0: 845 pci_disable_device(pdev); 846 goto out; 847}; 848 849/* 850 * Let's hope the default values are decent enough to protect my 851 * feet from the user's gun - Ueimor 852 */ 853static void dscc4_init_registers(struct dscc4_dev_priv *dpriv, 854 struct net_device *dev) 855{ 856 /* No interrupts, SCC core disabled. Let's relax */ 857 scc_writel(0x00000000, dpriv, dev, CCR0); 858 859 scc_writel(LengthCheck | (HDLC_MAX_MRU >> 5), dpriv, dev, RLCR); 860 861 /* 862 * No address recognition/crc-CCITT/cts enabled 863 * Shared flags transmission disabled - cf errata DS5 p.11 864 * Carrier detect disabled - cf errata p.14 865 * FIXME: carrier detection/polarity may be handled more gracefully. 866 */ 867 scc_writel(0x02408000, dpriv, dev, CCR1); 868 869 /* crc not forwarded - Cf errata DS5 p.11 */ 870 scc_writel(0x00050008 & ~RxActivate, dpriv, dev, CCR2); 871 // crc forwarded 872 //scc_writel(0x00250008 & ~RxActivate, dpriv, dev, CCR2); 873} 874 875static inline int dscc4_set_quartz(struct dscc4_dev_priv *dpriv, int hz) 876{ 877 int ret = 0; 878 879 if ((hz < 0) || (hz > DSCC4_HZ_MAX)) 880 ret = -EOPNOTSUPP; 881 else 882 dpriv->pci_priv->xtal_hz = hz; 883 884 return ret; 885} 886 887static const struct net_device_ops dscc4_ops = { 888 .ndo_open = dscc4_open, 889 .ndo_stop = dscc4_close, 890 .ndo_change_mtu = hdlc_change_mtu, 891 .ndo_start_xmit = hdlc_start_xmit, 892 .ndo_do_ioctl = dscc4_ioctl, 893 .ndo_tx_timeout = dscc4_tx_timeout, 894}; 895 896static int dscc4_found1(struct pci_dev *pdev, void __iomem *ioaddr) 897{ 898 struct dscc4_pci_priv *ppriv; 899 struct dscc4_dev_priv *root; 900 int i, ret = -ENOMEM; 901 902 root = kcalloc(dev_per_card, sizeof(*root), GFP_KERNEL); 903 if (!root) 904 goto err_out; 905 906 for (i = 0; i < dev_per_card; i++) { 907 root[i].dev = alloc_hdlcdev(root + i); 908 if (!root[i].dev) 909 goto err_free_dev; 910 } 911 912 ppriv = kzalloc(sizeof(*ppriv), GFP_KERNEL); 913 if (!ppriv) 914 goto err_free_dev; 915 916 ppriv->root = root; 917 spin_lock_init(&ppriv->lock); 918 919 for (i = 0; i < dev_per_card; i++) { 920 struct dscc4_dev_priv *dpriv = root + i; 921 struct net_device *d = dscc4_to_dev(dpriv); 922 hdlc_device *hdlc = dev_to_hdlc(d); 923 924 d->base_addr = (unsigned long)ioaddr; 925 d->irq = pdev->irq; 926 d->netdev_ops = &dscc4_ops; 927 d->watchdog_timeo = TX_TIMEOUT; 928 SET_NETDEV_DEV(d, &pdev->dev); 929 930 dpriv->dev_id = i; 931 dpriv->pci_priv = ppriv; 932 dpriv->base_addr = ioaddr; 933 spin_lock_init(&dpriv->lock); 934 935 hdlc->xmit = dscc4_start_xmit; 936 hdlc->attach = dscc4_hdlc_attach; 937 938 dscc4_init_registers(dpriv, d); 939 dpriv->parity = PARITY_CRC16_PR0_CCITT; 940 dpriv->encoding = ENCODING_NRZ; 941 942 ret = dscc4_init_ring(d); 943 if (ret < 0) 944 goto err_unregister; 945 946 ret = register_hdlc_device(d); 947 if (ret < 0) { 948 pr_err("unable to register\n"); 949 dscc4_release_ring(dpriv); 950 goto err_unregister; 951 } 952 } 953 954 ret = dscc4_set_quartz(root, quartz); 955 if (ret < 0) 956 goto err_unregister; 957 958 pci_set_drvdata(pdev, ppriv); 959 return ret; 960 961err_unregister: 962 while (i-- > 0) { 963 dscc4_release_ring(root + i); 964 unregister_hdlc_device(dscc4_to_dev(root + i)); 965 } 966 kfree(ppriv); 967 i = dev_per_card; 968err_free_dev: 969 while (i-- > 0) 970 free_netdev(root[i].dev); 971 kfree(root); 972err_out: 973 return ret; 974}; 975 976/* FIXME: get rid of the unneeded code */ 977static void dscc4_timer(unsigned long data) 978{ 979 struct net_device *dev = (struct net_device *)data; 980 struct dscc4_dev_priv *dpriv = dscc4_priv(dev); 981// struct dscc4_pci_priv *ppriv; 982 983 goto done; 984done: 985 dpriv->timer.expires = jiffies + TX_TIMEOUT; 986 add_timer(&dpriv->timer); 987} 988 989static void dscc4_tx_timeout(struct net_device *dev) 990{ 991 /* FIXME: something is missing there */ 992} 993 994static int dscc4_loopback_check(struct dscc4_dev_priv *dpriv) 995{ 996 sync_serial_settings *settings = &dpriv->settings; 997 998 if (settings->loopback && (settings->clock_type != CLOCK_INT)) { 999 struct net_device *dev = dscc4_to_dev(dpriv); 1000 1001 netdev_info(dev, "loopback requires clock\n"); 1002 return -1; 1003 } 1004 return 0; 1005} 1006 1007#ifdef CONFIG_DSCC4_PCI_RST 1008/* 1009 * Some DSCC4-based cards wires the GPIO port and the PCI #RST pin together 1010 * so as to provide a safe way to reset the asic while not the whole machine 1011 * rebooting. 1012 * 1013 * This code doesn't need to be efficient. Keep It Simple 1014 */ 1015static void dscc4_pci_reset(struct pci_dev *pdev, void __iomem *ioaddr) 1016{ 1017 int i; 1018 1019 mutex_lock(&dscc4_mutex); 1020 for (i = 0; i < 16; i++) 1021 pci_read_config_dword(pdev, i << 2, dscc4_pci_config_store + i); 1022 1023 /* Maximal LBI clock divider (who cares ?) and whole GPIO range. */ 1024 writel(0x001c0000, ioaddr + GMODE); 1025 /* Configure GPIO port as output */ 1026 writel(0x0000ffff, ioaddr + GPDIR); 1027 /* Disable interruption */ 1028 writel(0x0000ffff, ioaddr + GPIM); 1029 1030 writel(0x0000ffff, ioaddr + GPDATA); 1031 writel(0x00000000, ioaddr + GPDATA); 1032 1033 /* Flush posted writes */ 1034 readl(ioaddr + GSTAR); 1035 1036 schedule_timeout_uninterruptible(msecs_to_jiffies(100)); 1037 1038 for (i = 0; i < 16; i++) 1039 pci_write_config_dword(pdev, i << 2, dscc4_pci_config_store[i]); 1040 mutex_unlock(&dscc4_mutex); 1041} 1042#else 1043#define dscc4_pci_reset(pdev,ioaddr) do {} while (0) 1044#endif /* CONFIG_DSCC4_PCI_RST */ 1045 1046static int dscc4_open(struct net_device *dev) 1047{ 1048 struct dscc4_dev_priv *dpriv = dscc4_priv(dev); 1049 int ret = -EAGAIN; 1050 1051 if ((dscc4_loopback_check(dpriv) < 0)) 1052 goto err; 1053 1054 if ((ret = hdlc_open(dev))) 1055 goto err; 1056 1057 /* 1058 * Due to various bugs, there is no way to reliably reset a 1059 * specific port (manufacturer's dependent special PCI #RST wiring 1060 * apart: it affects all ports). Thus the device goes in the best 1061 * silent mode possible at dscc4_close() time and simply claims to 1062 * be up if it's opened again. It still isn't possible to change 1063 * the HDLC configuration without rebooting but at least the ports 1064 * can be up/down ifconfig'ed without killing the host. 1065 */ 1066 if (dpriv->flags & FakeReset) { 1067 dpriv->flags &= ~FakeReset; 1068 scc_patchl(0, PowerUp, dpriv, dev, CCR0); 1069 scc_patchl(0, 0x00050000, dpriv, dev, CCR2); 1070 scc_writel(EventsMask, dpriv, dev, IMR); 1071 netdev_info(dev, "up again\n"); 1072 goto done; 1073 } 1074 1075 /* IDT+IDR during XPR */ 1076 dpriv->flags = NeedIDR | NeedIDT; 1077 1078 scc_patchl(0, PowerUp | Vis, dpriv, dev, CCR0); 1079 1080 /* 1081 * The following is a bit paranoid... 1082 * 1083 * NB: the datasheet "...CEC will stay active if the SCC is in 1084 * power-down mode or..." and CCR2.RAC = 1 are two different 1085 * situations. 1086 */ 1087 if (scc_readl_star(dpriv, dev) & SccBusy) { 1088 netdev_err(dev, "busy - try later\n"); 1089 ret = -EAGAIN; 1090 goto err_out; 1091 } else 1092 netdev_info(dev, "available - good\n"); 1093 1094 scc_writel(EventsMask, dpriv, dev, IMR); 1095 1096 /* Posted write is flushed in the wait_ack loop */ 1097 scc_writel(TxSccRes | RxSccRes, dpriv, dev, CMDR); 1098 1099 if ((ret = dscc4_wait_ack_cec(dpriv, dev, "Cec")) < 0) 1100 goto err_disable_scc_events; 1101 1102 /* 1103 * I would expect XPR near CE completion (before ? after ?). 1104 * At worst, this code won't see a late XPR and people 1105 * will have to re-issue an ifconfig (this is harmless). 1106 * WARNING, a really missing XPR usually means a hardware 1107 * reset is needed. Suggestions anyone ? 1108 */ 1109 if ((ret = dscc4_xpr_ack(dpriv)) < 0) { 1110 pr_err("XPR timeout\n"); 1111 goto err_disable_scc_events; 1112 } 1113 1114 if (debug > 2) 1115 dscc4_tx_print(dev, dpriv, "Open"); 1116 1117done: 1118 netif_start_queue(dev); 1119 1120 init_timer(&dpriv->timer); 1121 dpriv->timer.expires = jiffies + 10*HZ; 1122 dpriv->timer.data = (unsigned long)dev; 1123 dpriv->timer.function = dscc4_timer; 1124 add_timer(&dpriv->timer); 1125 netif_carrier_on(dev); 1126 1127 return 0; 1128 1129err_disable_scc_events: 1130 scc_writel(0xffffffff, dpriv, dev, IMR); 1131 scc_patchl(PowerUp | Vis, 0, dpriv, dev, CCR0); 1132err_out: 1133 hdlc_close(dev); 1134err: 1135 return ret; 1136} 1137 1138#ifdef DSCC4_POLLING 1139static int dscc4_tx_poll(struct dscc4_dev_priv *dpriv, struct net_device *dev) 1140{ 1141 /* FIXME: it's gonna be easy (TM), for sure */ 1142} 1143#endif /* DSCC4_POLLING */ 1144 1145static netdev_tx_t dscc4_start_xmit(struct sk_buff *skb, 1146 struct net_device *dev) 1147{ 1148 struct dscc4_dev_priv *dpriv = dscc4_priv(dev); 1149 struct dscc4_pci_priv *ppriv = dpriv->pci_priv; 1150 struct TxFD *tx_fd; 1151 int next; 1152 1153 next = dpriv->tx_current%TX_RING_SIZE; 1154 dpriv->tx_skbuff[next] = skb; 1155 tx_fd = dpriv->tx_fd + next; 1156 tx_fd->state = FrameEnd | TO_STATE_TX(skb->len); 1157 tx_fd->data = cpu_to_le32(pci_map_single(ppriv->pdev, skb->data, skb->len, 1158 PCI_DMA_TODEVICE)); 1159 tx_fd->complete = 0x00000000; 1160 tx_fd->jiffies = jiffies; 1161 mb(); 1162 1163#ifdef DSCC4_POLLING 1164 spin_lock(&dpriv->lock); 1165 while (dscc4_tx_poll(dpriv, dev)); 1166 spin_unlock(&dpriv->lock); 1167#endif 1168 1169 if (debug > 2) 1170 dscc4_tx_print(dev, dpriv, "Xmit"); 1171 /* To be cleaned(unsigned int)/optimized. Later, ok ? */ 1172 if (!((++dpriv->tx_current - dpriv->tx_dirty)%TX_RING_SIZE)) 1173 netif_stop_queue(dev); 1174 1175 if (dscc4_tx_quiescent(dpriv, dev)) 1176 dscc4_do_tx(dpriv, dev); 1177 1178 return NETDEV_TX_OK; 1179} 1180 1181static int dscc4_close(struct net_device *dev) 1182{ 1183 struct dscc4_dev_priv *dpriv = dscc4_priv(dev); 1184 1185 del_timer_sync(&dpriv->timer); 1186 netif_stop_queue(dev); 1187 1188 scc_patchl(PowerUp | Vis, 0, dpriv, dev, CCR0); 1189 scc_patchl(0x00050000, 0, dpriv, dev, CCR2); 1190 scc_writel(0xffffffff, dpriv, dev, IMR); 1191 1192 dpriv->flags |= FakeReset; 1193 1194 hdlc_close(dev); 1195 1196 return 0; 1197} 1198 1199static inline int dscc4_check_clock_ability(int port) 1200{ 1201 int ret = 0; 1202 1203#ifdef CONFIG_DSCC4_PCISYNC 1204 if (port >= 2) 1205 ret = -1; 1206#endif 1207 return ret; 1208} 1209 1210/* 1211 * DS1 p.137: "There are a total of 13 different clocking modes..." 1212 * ^^ 1213 * Design choices: 1214 * - by default, assume a clock is provided on pin RxClk/TxClk (clock mode 0a). 1215 * Clock mode 3b _should_ work but the testing seems to make this point 1216 * dubious (DIY testing requires setting CCR0 at 0x00000033). 1217 * This is supposed to provide least surprise "DTE like" behavior. 1218 * - if line rate is specified, clocks are assumed to be locally generated. 1219 * A quartz must be available (on pin XTAL1). Modes 6b/7b are used. Choosing 1220 * between these it automagically done according on the required frequency 1221 * scaling. Of course some rounding may take place. 1222 * - no high speed mode (40Mb/s). May be trivial to do but I don't have an 1223 * appropriate external clocking device for testing. 1224 * - no time-slot/clock mode 5: shameless laziness. 1225 * 1226 * The clock signals wiring can be (is ?) manufacturer dependent. Good luck. 1227 * 1228 * BIG FAT WARNING: if the device isn't provided enough clocking signal, it 1229 * won't pass the init sequence. For example, straight back-to-back DTE without 1230 * external clock will fail when dscc4_open() (<- 'ifconfig hdlcx xxx') is 1231 * called. 1232 * 1233 * Typos lurk in datasheet (missing divier in clock mode 7a figure 51 p.153 1234 * DS0 for example) 1235 * 1236 * Clock mode related bits of CCR0: 1237 * +------------ TOE: output TxClk (0b/2b/3a/3b/6b/7a/7b only) 1238 * | +---------- SSEL: sub-mode select 0 -> a, 1 -> b 1239 * | | +-------- High Speed: say 0 1240 * | | | +-+-+-- Clock Mode: 0..7 1241 * | | | | | | 1242 * -+-+-+-+-+-+-+-+ 1243 * x|x|5|4|3|2|1|0| lower bits 1244 * 1245 * Division factor of BRR: k = (N+1)x2^M (total divider = 16xk in mode 6b) 1246 * +-+-+-+------------------ M (0..15) 1247 * | | | | +-+-+-+-+-+-- N (0..63) 1248 * 0 0 0 0 | | | | 0 0 | | | | | | 1249 * ...-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1250 * f|e|d|c|b|a|9|8|7|6|5|4|3|2|1|0| lower bits 1251 * 1252 */ 1253static int dscc4_set_clock(struct net_device *dev, u32 *bps, u32 *state) 1254{ 1255 struct dscc4_dev_priv *dpriv = dscc4_priv(dev); 1256 int ret = -1; 1257 u32 brr; 1258 1259 *state &= ~Ccr0ClockMask; 1260 if (*bps) { /* Clock generated - required for DCE */ 1261 u32 n = 0, m = 0, divider; 1262 int xtal; 1263 1264 xtal = dpriv->pci_priv->xtal_hz; 1265 if (!xtal) 1266 goto done; 1267 if (dscc4_check_clock_ability(dpriv->dev_id) < 0) 1268 goto done; 1269 divider = xtal / *bps; 1270 if (divider > BRR_DIVIDER_MAX) { 1271 divider >>= 4; 1272 *state |= 0x00000036; /* Clock mode 6b (BRG/16) */ 1273 } else 1274 *state |= 0x00000037; /* Clock mode 7b (BRG) */ 1275 if (divider >> 22) { 1276 n = 63; 1277 m = 15; 1278 } else if (divider) { 1279 /* Extraction of the 6 highest weighted bits */ 1280 m = 0; 1281 while (0xffffffc0 & divider) { 1282 m++; 1283 divider >>= 1; 1284 } 1285 n = divider; 1286 } 1287 brr = (m << 8) | n; 1288 divider = n << m; 1289 if (!(*state & 0x00000001)) /* ?b mode mask => clock mode 6b */ 1290 divider <<= 4; 1291 *bps = xtal / divider; 1292 } else { 1293 /* 1294 * External clock - DTE 1295 * "state" already reflects Clock mode 0a (CCR0 = 0xzzzzzz00). 1296 * Nothing more to be done 1297 */ 1298 brr = 0; 1299 } 1300 scc_writel(brr, dpriv, dev, BRR); 1301 ret = 0; 1302done: 1303 return ret; 1304} 1305 1306static int dscc4_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1307{ 1308 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync; 1309 struct dscc4_dev_priv *dpriv = dscc4_priv(dev); 1310 const size_t size = sizeof(dpriv->settings); 1311 int ret = 0; 1312 1313 if (dev->flags & IFF_UP) 1314 return -EBUSY; 1315 1316 if (cmd != SIOCWANDEV) 1317 return -EOPNOTSUPP; 1318 1319 switch(ifr->ifr_settings.type) { 1320 case IF_GET_IFACE: 1321 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL; 1322 if (ifr->ifr_settings.size < size) { 1323 ifr->ifr_settings.size = size; /* data size wanted */ 1324 return -ENOBUFS; 1325 } 1326 if (copy_to_user(line, &dpriv->settings, size)) 1327 return -EFAULT; 1328 break; 1329 1330 case IF_IFACE_SYNC_SERIAL: 1331 if (!capable(CAP_NET_ADMIN)) 1332 return -EPERM; 1333 1334 if (dpriv->flags & FakeReset) { 1335 netdev_info(dev, "please reset the device before this command\n"); 1336 return -EPERM; 1337 } 1338 if (copy_from_user(&dpriv->settings, line, size)) 1339 return -EFAULT; 1340 ret = dscc4_set_iface(dpriv, dev); 1341 break; 1342 1343 default: 1344 ret = hdlc_ioctl(dev, ifr, cmd); 1345 break; 1346 } 1347 1348 return ret; 1349} 1350 1351static int dscc4_match(const struct thingie *p, int value) 1352{ 1353 int i; 1354 1355 for (i = 0; p[i].define != -1; i++) { 1356 if (value == p[i].define) 1357 break; 1358 } 1359 if (p[i].define == -1) 1360 return -1; 1361 else 1362 return i; 1363} 1364 1365static int dscc4_clock_setting(struct dscc4_dev_priv *dpriv, 1366 struct net_device *dev) 1367{ 1368 sync_serial_settings *settings = &dpriv->settings; 1369 int ret = -EOPNOTSUPP; 1370 u32 bps, state; 1371 1372 bps = settings->clock_rate; 1373 state = scc_readl(dpriv, CCR0); 1374 if (dscc4_set_clock(dev, &bps, &state) < 0) 1375 goto done; 1376 if (bps) { /* DCE */ 1377 printk(KERN_DEBUG "%s: generated RxClk (DCE)\n", dev->name); 1378 if (settings->clock_rate != bps) { 1379 printk(KERN_DEBUG "%s: clock adjusted (%08d -> %08d)\n", 1380 dev->name, settings->clock_rate, bps); 1381 settings->clock_rate = bps; 1382 } 1383 } else { /* DTE */ 1384 state |= PowerUp | Vis; 1385 printk(KERN_DEBUG "%s: external RxClk (DTE)\n", dev->name); 1386 } 1387 scc_writel(state, dpriv, dev, CCR0); 1388 ret = 0; 1389done: 1390 return ret; 1391} 1392 1393static int dscc4_encoding_setting(struct dscc4_dev_priv *dpriv, 1394 struct net_device *dev) 1395{ 1396 static const struct thingie encoding[] = { 1397 { ENCODING_NRZ, 0x00000000 }, 1398 { ENCODING_NRZI, 0x00200000 }, 1399 { ENCODING_FM_MARK, 0x00400000 }, 1400 { ENCODING_FM_SPACE, 0x00500000 }, 1401 { ENCODING_MANCHESTER, 0x00600000 }, 1402 { -1, 0} 1403 }; 1404 int i, ret = 0; 1405 1406 i = dscc4_match(encoding, dpriv->encoding); 1407 if (i >= 0) 1408 scc_patchl(EncodingMask, encoding[i].bits, dpriv, dev, CCR0); 1409 else 1410 ret = -EOPNOTSUPP; 1411 return ret; 1412} 1413 1414static int dscc4_loopback_setting(struct dscc4_dev_priv *dpriv, 1415 struct net_device *dev) 1416{ 1417 sync_serial_settings *settings = &dpriv->settings; 1418 u32 state; 1419 1420 state = scc_readl(dpriv, CCR1); 1421 if (settings->loopback) { 1422 printk(KERN_DEBUG "%s: loopback\n", dev->name); 1423 state |= 0x00000100; 1424 } else { 1425 printk(KERN_DEBUG "%s: normal\n", dev->name); 1426 state &= ~0x00000100; 1427 } 1428 scc_writel(state, dpriv, dev, CCR1); 1429 return 0; 1430} 1431 1432static int dscc4_crc_setting(struct dscc4_dev_priv *dpriv, 1433 struct net_device *dev) 1434{ 1435 static const struct thingie crc[] = { 1436 { PARITY_CRC16_PR0_CCITT, 0x00000010 }, 1437 { PARITY_CRC16_PR1_CCITT, 0x00000000 }, 1438 { PARITY_CRC32_PR0_CCITT, 0x00000011 }, 1439 { PARITY_CRC32_PR1_CCITT, 0x00000001 } 1440 }; 1441 int i, ret = 0; 1442 1443 i = dscc4_match(crc, dpriv->parity); 1444 if (i >= 0) 1445 scc_patchl(CrcMask, crc[i].bits, dpriv, dev, CCR1); 1446 else 1447 ret = -EOPNOTSUPP; 1448 return ret; 1449} 1450 1451static int dscc4_set_iface(struct dscc4_dev_priv *dpriv, struct net_device *dev) 1452{ 1453 struct { 1454 int (*action)(struct dscc4_dev_priv *, struct net_device *); 1455 } *p, do_setting[] = { 1456 { dscc4_encoding_setting }, 1457 { dscc4_clock_setting }, 1458 { dscc4_loopback_setting }, 1459 { dscc4_crc_setting }, 1460 { NULL } 1461 }; 1462 int ret = 0; 1463 1464 for (p = do_setting; p->action; p++) { 1465 if ((ret = p->action(dpriv, dev)) < 0) 1466 break; 1467 } 1468 return ret; 1469} 1470 1471static irqreturn_t dscc4_irq(int irq, void *token) 1472{ 1473 struct dscc4_dev_priv *root = token; 1474 struct dscc4_pci_priv *priv; 1475 struct net_device *dev; 1476 void __iomem *ioaddr; 1477 u32 state; 1478 unsigned long flags; 1479 int i, handled = 1; 1480 1481 priv = root->pci_priv; 1482 dev = dscc4_to_dev(root); 1483 1484 spin_lock_irqsave(&priv->lock, flags); 1485 1486 ioaddr = root->base_addr; 1487 1488 state = readl(ioaddr + GSTAR); 1489 if (!state) { 1490 handled = 0; 1491 goto out; 1492 } 1493 if (debug > 3) 1494 printk(KERN_DEBUG "%s: GSTAR = 0x%08x\n", DRV_NAME, state); 1495 writel(state, ioaddr + GSTAR); 1496 1497 if (state & Arf) { 1498 netdev_err(dev, "failure (Arf). Harass the maintainer\n"); 1499 goto out; 1500 } 1501 state &= ~ArAck; 1502 if (state & Cfg) { 1503 if (debug > 0) 1504 printk(KERN_DEBUG "%s: CfgIV\n", DRV_NAME); 1505 if (priv->iqcfg[priv->cfg_cur++%IRQ_RING_SIZE] & cpu_to_le32(Arf)) 1506 netdev_err(dev, "CFG failed\n"); 1507 if (!(state &= ~Cfg)) 1508 goto out; 1509 } 1510 if (state & RxEvt) { 1511 i = dev_per_card - 1; 1512 do { 1513 dscc4_rx_irq(priv, root + i); 1514 } while (--i >= 0); 1515 state &= ~RxEvt; 1516 } 1517 if (state & TxEvt) { 1518 i = dev_per_card - 1; 1519 do { 1520 dscc4_tx_irq(priv, root + i); 1521 } while (--i >= 0); 1522 state &= ~TxEvt; 1523 } 1524out: 1525 spin_unlock_irqrestore(&priv->lock, flags); 1526 return IRQ_RETVAL(handled); 1527} 1528 1529static void dscc4_tx_irq(struct dscc4_pci_priv *ppriv, 1530 struct dscc4_dev_priv *dpriv) 1531{ 1532 struct net_device *dev = dscc4_to_dev(dpriv); 1533 u32 state; 1534 int cur, loop = 0; 1535 1536try: 1537 cur = dpriv->iqtx_current%IRQ_RING_SIZE; 1538 state = le32_to_cpu(dpriv->iqtx[cur]); 1539 if (!state) { 1540 if (debug > 4) 1541 printk(KERN_DEBUG "%s: Tx ISR = 0x%08x\n", dev->name, 1542 state); 1543 if ((debug > 1) && (loop > 1)) 1544 printk(KERN_DEBUG "%s: Tx irq loop=%d\n", dev->name, loop); 1545 if (loop && netif_queue_stopped(dev)) 1546 if ((dpriv->tx_current - dpriv->tx_dirty)%TX_RING_SIZE) 1547 netif_wake_queue(dev); 1548 1549 if (netif_running(dev) && dscc4_tx_quiescent(dpriv, dev) && 1550 !dscc4_tx_done(dpriv)) 1551 dscc4_do_tx(dpriv, dev); 1552 return; 1553 } 1554 loop++; 1555 dpriv->iqtx[cur] = 0; 1556 dpriv->iqtx_current++; 1557 1558 if (state_check(state, dpriv, dev, "Tx") < 0) 1559 return; 1560 1561 if (state & SccEvt) { 1562 if (state & Alls) { 1563 struct sk_buff *skb; 1564 struct TxFD *tx_fd; 1565 1566 if (debug > 2) 1567 dscc4_tx_print(dev, dpriv, "Alls"); 1568 /* 1569 * DataComplete can't be trusted for Tx completion. 1570 * Cf errata DS5 p.8 1571 */ 1572 cur = dpriv->tx_dirty%TX_RING_SIZE; 1573 tx_fd = dpriv->tx_fd + cur; 1574 skb = dpriv->tx_skbuff[cur]; 1575 if (skb) { 1576 pci_unmap_single(ppriv->pdev, le32_to_cpu(tx_fd->data), 1577 skb->len, PCI_DMA_TODEVICE); 1578 if (tx_fd->state & FrameEnd) { 1579 dev->stats.tx_packets++; 1580 dev->stats.tx_bytes += skb->len; 1581 } 1582 dev_kfree_skb_irq(skb); 1583 dpriv->tx_skbuff[cur] = NULL; 1584 ++dpriv->tx_dirty; 1585 } else { 1586 if (debug > 1) 1587 netdev_err(dev, "Tx: NULL skb %d\n", 1588 cur); 1589 } 1590 /* 1591 * If the driver ends sending crap on the wire, it 1592 * will be way easier to diagnose than the (not so) 1593 * random freeze induced by null sized tx frames. 1594 */ 1595 tx_fd->data = tx_fd->next; 1596 tx_fd->state = FrameEnd | TO_STATE_TX(2*DUMMY_SKB_SIZE); 1597 tx_fd->complete = 0x00000000; 1598 tx_fd->jiffies = 0; 1599 1600 if (!(state &= ~Alls)) 1601 goto try; 1602 } 1603 /* 1604 * Transmit Data Underrun 1605 */ 1606 if (state & Xdu) { 1607 netdev_err(dev, "Tx Data Underrun. Ask maintainer\n"); 1608 dpriv->flags = NeedIDT; 1609 /* Tx reset */ 1610 writel(MTFi | Rdt, 1611 dpriv->base_addr + 0x0c*dpriv->dev_id + CH0CFG); 1612 writel(Action, dpriv->base_addr + GCMDR); 1613 return; 1614 } 1615 if (state & Cts) { 1616 netdev_info(dev, "CTS transition\n"); 1617 if (!(state &= ~Cts)) /* DEBUG */ 1618 goto try; 1619 } 1620 if (state & Xmr) { 1621 /* Frame needs to be sent again - FIXME */ 1622 netdev_err(dev, "Tx ReTx. Ask maintainer\n"); 1623 if (!(state &= ~Xmr)) /* DEBUG */ 1624 goto try; 1625 } 1626 if (state & Xpr) { 1627 void __iomem *scc_addr; 1628 unsigned long ring; 1629 int i; 1630 1631 /* 1632 * - the busy condition happens (sometimes); 1633 * - it doesn't seem to make the handler unreliable. 1634 */ 1635 for (i = 1; i; i <<= 1) { 1636 if (!(scc_readl_star(dpriv, dev) & SccBusy)) 1637 break; 1638 } 1639 if (!i) 1640 netdev_info(dev, "busy in irq\n"); 1641 1642 scc_addr = dpriv->base_addr + 0x0c*dpriv->dev_id; 1643 /* Keep this order: IDT before IDR */ 1644 if (dpriv->flags & NeedIDT) { 1645 if (debug > 2) 1646 dscc4_tx_print(dev, dpriv, "Xpr"); 1647 ring = dpriv->tx_fd_dma + 1648 (dpriv->tx_dirty%TX_RING_SIZE)* 1649 sizeof(struct TxFD); 1650 writel(ring, scc_addr + CH0BTDA); 1651 dscc4_do_tx(dpriv, dev); 1652 writel(MTFi | Idt, scc_addr + CH0CFG); 1653 if (dscc4_do_action(dev, "IDT") < 0) 1654 goto err_xpr; 1655 dpriv->flags &= ~NeedIDT; 1656 } 1657 if (dpriv->flags & NeedIDR) { 1658 ring = dpriv->rx_fd_dma + 1659 (dpriv->rx_current%RX_RING_SIZE)* 1660 sizeof(struct RxFD); 1661 writel(ring, scc_addr + CH0BRDA); 1662 dscc4_rx_update(dpriv, dev); 1663 writel(MTFi | Idr, scc_addr + CH0CFG); 1664 if (dscc4_do_action(dev, "IDR") < 0) 1665 goto err_xpr; 1666 dpriv->flags &= ~NeedIDR; 1667 smp_wmb(); 1668 /* Activate receiver and misc */ 1669 scc_writel(0x08050008, dpriv, dev, CCR2); 1670 } 1671 err_xpr: 1672 if (!(state &= ~Xpr)) 1673 goto try; 1674 } 1675 if (state & Cd) { 1676 if (debug > 0) 1677 netdev_info(dev, "CD transition\n"); 1678 if (!(state &= ~Cd)) /* DEBUG */ 1679 goto try; 1680 } 1681 } else { /* ! SccEvt */ 1682 if (state & Hi) { 1683#ifdef DSCC4_POLLING 1684 while (!dscc4_tx_poll(dpriv, dev)); 1685#endif 1686 netdev_info(dev, "Tx Hi\n"); 1687 state &= ~Hi; 1688 } 1689 if (state & Err) { 1690 netdev_info(dev, "Tx ERR\n"); 1691 dev->stats.tx_errors++; 1692 state &= ~Err; 1693 } 1694 } 1695 goto try; 1696} 1697 1698static void dscc4_rx_irq(struct dscc4_pci_priv *priv, 1699 struct dscc4_dev_priv *dpriv) 1700{ 1701 struct net_device *dev = dscc4_to_dev(dpriv); 1702 u32 state; 1703 int cur; 1704 1705try: 1706 cur = dpriv->iqrx_current%IRQ_RING_SIZE; 1707 state = le32_to_cpu(dpriv->iqrx[cur]); 1708 if (!state) 1709 return; 1710 dpriv->iqrx[cur] = 0; 1711 dpriv->iqrx_current++; 1712 1713 if (state_check(state, dpriv, dev, "Rx") < 0) 1714 return; 1715 1716 if (!(state & SccEvt)){ 1717 struct RxFD *rx_fd; 1718 1719 if (debug > 4) 1720 printk(KERN_DEBUG "%s: Rx ISR = 0x%08x\n", dev->name, 1721 state); 1722 state &= 0x00ffffff; 1723 if (state & Err) { /* Hold or reset */ 1724 printk(KERN_DEBUG "%s: Rx ERR\n", dev->name); 1725 cur = dpriv->rx_current%RX_RING_SIZE; 1726 rx_fd = dpriv->rx_fd + cur; 1727 /* 1728 * Presume we're not facing a DMAC receiver reset. 1729 * As We use the rx size-filtering feature of the 1730 * DSCC4, the beginning of a new frame is waiting in 1731 * the rx fifo. I bet a Receive Data Overflow will 1732 * happen most of time but let's try and avoid it. 1733 * Btw (as for RDO) if one experiences ERR whereas 1734 * the system looks rather idle, there may be a 1735 * problem with latency. In this case, increasing 1736 * RX_RING_SIZE may help. 1737 */ 1738 //while (dpriv->rx_needs_refill) { 1739 while (!(rx_fd->state1 & Hold)) { 1740 rx_fd++; 1741 cur++; 1742 if (!(cur = cur%RX_RING_SIZE)) 1743 rx_fd = dpriv->rx_fd; 1744 } 1745 //dpriv->rx_needs_refill--; 1746 try_get_rx_skb(dpriv, dev); 1747 if (!rx_fd->data) 1748 goto try; 1749 rx_fd->state1 &= ~Hold; 1750 rx_fd->state2 = 0x00000000; 1751 rx_fd->end = cpu_to_le32(0xbabeface); 1752 //} 1753 goto try; 1754 } 1755 if (state & Fi) { 1756 dscc4_rx_skb(dpriv, dev); 1757 goto try; 1758 } 1759 if (state & Hi ) { /* HI bit */ 1760 netdev_info(dev, "Rx Hi\n"); 1761 state &= ~Hi; 1762 goto try; 1763 } 1764 } else { /* SccEvt */ 1765 if (debug > 1) { 1766 //FIXME: verifier la presence de tous les evenements 1767 static struct { 1768 u32 mask; 1769 const char *irq_name; 1770 } evts[] = { 1771 { 0x00008000, "TIN"}, 1772 { 0x00000020, "RSC"}, 1773 { 0x00000010, "PCE"}, 1774 { 0x00000008, "PLLA"}, 1775 { 0, NULL} 1776 }, *evt; 1777 1778 for (evt = evts; evt->irq_name; evt++) { 1779 if (state & evt->mask) { 1780 printk(KERN_DEBUG "%s: %s\n", 1781 dev->name, evt->irq_name); 1782 if (!(state &= ~evt->mask)) 1783 goto try; 1784 } 1785 } 1786 } else { 1787 if (!(state &= ~0x0000c03c)) 1788 goto try; 1789 } 1790 if (state & Cts) { 1791 netdev_info(dev, "CTS transition\n"); 1792 if (!(state &= ~Cts)) /* DEBUG */ 1793 goto try; 1794 } 1795 /* 1796 * Receive Data Overflow (FIXME: fscked) 1797 */ 1798 if (state & Rdo) { 1799 struct RxFD *rx_fd; 1800 void __iomem *scc_addr; 1801 int cur; 1802 1803 //if (debug) 1804 // dscc4_rx_dump(dpriv); 1805 scc_addr = dpriv->base_addr + 0x0c*dpriv->dev_id; 1806 1807 scc_patchl(RxActivate, 0, dpriv, dev, CCR2); 1808 /* 1809 * This has no effect. Why ? 1810 * ORed with TxSccRes, one sees the CFG ack (for 1811 * the TX part only). 1812 */ 1813 scc_writel(RxSccRes, dpriv, dev, CMDR); 1814 dpriv->flags |= RdoSet; 1815 1816 /* 1817 * Let's try and save something in the received data. 1818 * rx_current must be incremented at least once to 1819 * avoid HOLD in the BRDA-to-be-pointed desc. 1820 */ 1821 do { 1822 cur = dpriv->rx_current++%RX_RING_SIZE; 1823 rx_fd = dpriv->rx_fd + cur; 1824 if (!(rx_fd->state2 & DataComplete)) 1825 break; 1826 if (rx_fd->state2 & FrameAborted) { 1827 dev->stats.rx_over_errors++; 1828 rx_fd->state1 |= Hold; 1829 rx_fd->state2 = 0x00000000; 1830 rx_fd->end = cpu_to_le32(0xbabeface); 1831 } else 1832 dscc4_rx_skb(dpriv, dev); 1833 } while (1); 1834 1835 if (debug > 0) { 1836 if (dpriv->flags & RdoSet) 1837 printk(KERN_DEBUG 1838 "%s: no RDO in Rx data\n", DRV_NAME); 1839 } 1840#ifdef DSCC4_RDO_EXPERIMENTAL_RECOVERY 1841 /* 1842 * FIXME: must the reset be this violent ? 1843 */ 1844#warning "FIXME: CH0BRDA" 1845 writel(dpriv->rx_fd_dma + 1846 (dpriv->rx_current%RX_RING_SIZE)* 1847 sizeof(struct RxFD), scc_addr + CH0BRDA); 1848 writel(MTFi|Rdr|Idr, scc_addr + CH0CFG); 1849 if (dscc4_do_action(dev, "RDR") < 0) { 1850 netdev_err(dev, "RDO recovery failed(RDR)\n"); 1851 goto rdo_end; 1852 } 1853 writel(MTFi|Idr, scc_addr + CH0CFG); 1854 if (dscc4_do_action(dev, "IDR") < 0) { 1855 netdev_err(dev, "RDO recovery failed(IDR)\n"); 1856 goto rdo_end; 1857 } 1858 rdo_end: 1859#endif 1860 scc_patchl(0, RxActivate, dpriv, dev, CCR2); 1861 goto try; 1862 } 1863 if (state & Cd) { 1864 netdev_info(dev, "CD transition\n"); 1865 if (!(state &= ~Cd)) /* DEBUG */ 1866 goto try; 1867 } 1868 if (state & Flex) { 1869 printk(KERN_DEBUG "%s: Flex. Ttttt...\n", DRV_NAME); 1870 if (!(state &= ~Flex)) 1871 goto try; 1872 } 1873 } 1874} 1875 1876/* 1877 * I had expected the following to work for the first descriptor 1878 * (tx_fd->state = 0xc0000000) 1879 * - Hold=1 (don't try and branch to the next descripto); 1880 * - No=0 (I want an empty data section, i.e. size=0); 1881 * - Fe=1 (required by No=0 or we got an Err irq and must reset). 1882 * It failed and locked solid. Thus the introduction of a dummy skb. 1883 * Problem is acknowledged in errata sheet DS5. Joy :o/ 1884 */ 1885static struct sk_buff *dscc4_init_dummy_skb(struct dscc4_dev_priv *dpriv) 1886{ 1887 struct sk_buff *skb; 1888 1889 skb = dev_alloc_skb(DUMMY_SKB_SIZE); 1890 if (skb) { 1891 int last = dpriv->tx_dirty%TX_RING_SIZE; 1892 struct TxFD *tx_fd = dpriv->tx_fd + last; 1893 1894 skb->len = DUMMY_SKB_SIZE; 1895 skb_copy_to_linear_data(skb, version, 1896 strlen(version) % DUMMY_SKB_SIZE); 1897 tx_fd->state = FrameEnd | TO_STATE_TX(DUMMY_SKB_SIZE); 1898 tx_fd->data = cpu_to_le32(pci_map_single(dpriv->pci_priv->pdev, 1899 skb->data, DUMMY_SKB_SIZE, 1900 PCI_DMA_TODEVICE)); 1901 dpriv->tx_skbuff[last] = skb; 1902 } 1903 return skb; 1904} 1905 1906static int dscc4_init_ring(struct net_device *dev) 1907{ 1908 struct dscc4_dev_priv *dpriv = dscc4_priv(dev); 1909 struct pci_dev *pdev = dpriv->pci_priv->pdev; 1910 struct TxFD *tx_fd; 1911 struct RxFD *rx_fd; 1912 void *ring; 1913 int i; 1914 1915 ring = pci_alloc_consistent(pdev, RX_TOTAL_SIZE, &dpriv->rx_fd_dma); 1916 if (!ring) 1917 goto err_out; 1918 dpriv->rx_fd = rx_fd = (struct RxFD *) ring; 1919 1920 ring = pci_alloc_consistent(pdev, TX_TOTAL_SIZE, &dpriv->tx_fd_dma); 1921 if (!ring) 1922 goto err_free_dma_rx; 1923 dpriv->tx_fd = tx_fd = (struct TxFD *) ring; 1924 1925 memset(dpriv->tx_skbuff, 0, sizeof(struct sk_buff *)*TX_RING_SIZE); 1926 dpriv->tx_dirty = 0xffffffff; 1927 i = dpriv->tx_current = 0; 1928 do { 1929 tx_fd->state = FrameEnd | TO_STATE_TX(2*DUMMY_SKB_SIZE); 1930 tx_fd->complete = 0x00000000; 1931 /* FIXME: NULL should be ok - to be tried */ 1932 tx_fd->data = cpu_to_le32(dpriv->tx_fd_dma); 1933 (tx_fd++)->next = cpu_to_le32(dpriv->tx_fd_dma + 1934 (++i%TX_RING_SIZE)*sizeof(*tx_fd)); 1935 } while (i < TX_RING_SIZE); 1936 1937 if (!dscc4_init_dummy_skb(dpriv)) 1938 goto err_free_dma_tx; 1939 1940 memset(dpriv->rx_skbuff, 0, sizeof(struct sk_buff *)*RX_RING_SIZE); 1941 i = dpriv->rx_dirty = dpriv->rx_current = 0; 1942 do { 1943 /* size set by the host. Multiple of 4 bytes please */ 1944 rx_fd->state1 = HiDesc; 1945 rx_fd->state2 = 0x00000000; 1946 rx_fd->end = cpu_to_le32(0xbabeface); 1947 rx_fd->state1 |= TO_STATE_RX(HDLC_MAX_MRU); 1948 // FIXME: return value verifiee mais traitement suspect 1949 if (try_get_rx_skb(dpriv, dev) >= 0) 1950 dpriv->rx_dirty++; 1951 (rx_fd++)->next = cpu_to_le32(dpriv->rx_fd_dma + 1952 (++i%RX_RING_SIZE)*sizeof(*rx_fd)); 1953 } while (i < RX_RING_SIZE); 1954 1955 return 0; 1956 1957err_free_dma_tx: 1958 pci_free_consistent(pdev, TX_TOTAL_SIZE, ring, dpriv->tx_fd_dma); 1959err_free_dma_rx: 1960 pci_free_consistent(pdev, RX_TOTAL_SIZE, rx_fd, dpriv->rx_fd_dma); 1961err_out: 1962 return -ENOMEM; 1963} 1964 1965static void dscc4_remove_one(struct pci_dev *pdev) 1966{ 1967 struct dscc4_pci_priv *ppriv; 1968 struct dscc4_dev_priv *root; 1969 void __iomem *ioaddr; 1970 int i; 1971 1972 ppriv = pci_get_drvdata(pdev); 1973 root = ppriv->root; 1974 1975 ioaddr = root->base_addr; 1976 1977 dscc4_pci_reset(pdev, ioaddr); 1978 1979 free_irq(pdev->irq, root); 1980 pci_free_consistent(pdev, IRQ_RING_SIZE*sizeof(u32), ppriv->iqcfg, 1981 ppriv->iqcfg_dma); 1982 for (i = 0; i < dev_per_card; i++) { 1983 struct dscc4_dev_priv *dpriv = root + i; 1984 1985 dscc4_release_ring(dpriv); 1986 pci_free_consistent(pdev, IRQ_RING_SIZE*sizeof(u32), 1987 dpriv->iqrx, dpriv->iqrx_dma); 1988 pci_free_consistent(pdev, IRQ_RING_SIZE*sizeof(u32), 1989 dpriv->iqtx, dpriv->iqtx_dma); 1990 } 1991 1992 dscc4_free1(pdev); 1993 1994 iounmap(ioaddr); 1995 1996 pci_release_region(pdev, 1); 1997 pci_release_region(pdev, 0); 1998 1999 pci_disable_device(pdev); 2000} 2001 2002static int dscc4_hdlc_attach(struct net_device *dev, unsigned short encoding, 2003 unsigned short parity) 2004{ 2005 struct dscc4_dev_priv *dpriv = dscc4_priv(dev); 2006 2007 if (encoding != ENCODING_NRZ && 2008 encoding != ENCODING_NRZI && 2009 encoding != ENCODING_FM_MARK && 2010 encoding != ENCODING_FM_SPACE && 2011 encoding != ENCODING_MANCHESTER) 2012 return -EINVAL; 2013 2014 if (parity != PARITY_NONE && 2015 parity != PARITY_CRC16_PR0_CCITT && 2016 parity != PARITY_CRC16_PR1_CCITT && 2017 parity != PARITY_CRC32_PR0_CCITT && 2018 parity != PARITY_CRC32_PR1_CCITT) 2019 return -EINVAL; 2020 2021 dpriv->encoding = encoding; 2022 dpriv->parity = parity; 2023 return 0; 2024} 2025 2026#ifndef MODULE 2027static int __init dscc4_setup(char *str) 2028{ 2029 int *args[] = { &debug, &quartz, NULL }, **p = args; 2030 2031 while (*p && (get_option(&str, *p) == 2)) 2032 p++; 2033 return 1; 2034} 2035 2036__setup("dscc4.setup=", dscc4_setup); 2037#endif 2038 2039static const struct pci_device_id dscc4_pci_tbl[] = { 2040 { PCI_VENDOR_ID_SIEMENS, PCI_DEVICE_ID_SIEMENS_DSCC4, 2041 PCI_ANY_ID, PCI_ANY_ID, }, 2042 { 0,} 2043}; 2044MODULE_DEVICE_TABLE(pci, dscc4_pci_tbl); 2045 2046static struct pci_driver dscc4_driver = { 2047 .name = DRV_NAME, 2048 .id_table = dscc4_pci_tbl, 2049 .probe = dscc4_init_one, 2050 .remove = dscc4_remove_one, 2051}; 2052 2053module_pci_driver(dscc4_driver); 2054