1 // SPDX-License-Identifier: GPL-1.0+ 2 /* 3 * Device driver for Microgate SyncLink GT serial adapters. 4 * 5 * written by Paul Fulghum for Microgate Corporation 6 * paulkf@microgate.com 7 * 8 * Microgate and SyncLink are trademarks of Microgate Corporation 9 * 10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 11 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 12 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 13 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 14 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 15 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 16 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 17 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 18 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 19 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 20 * OF THE POSSIBILITY OF SUCH DAMAGE. 21 */ 22 23 /* 24 * DEBUG OUTPUT DEFINITIONS 25 * 26 * uncomment lines below to enable specific types of debug output 27 * 28 * DBGINFO information - most verbose output 29 * DBGERR serious errors 30 * DBGBH bottom half service routine debugging 31 * DBGISR interrupt service routine debugging 32 * DBGDATA output receive and transmit data 33 * DBGTBUF output transmit DMA buffers and registers 34 * DBGRBUF output receive DMA buffers and registers 35 */ 36 37 #define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt 38 #define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt 39 #define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt 40 #define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt 41 #define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label)) 42 /*#define DBGTBUF(info) dump_tbufs(info)*/ 43 /*#define DBGRBUF(info) dump_rbufs(info)*/ 44 45 46 #include <linux/module.h> 47 #include <linux/errno.h> 48 #include <linux/signal.h> 49 #include <linux/sched.h> 50 #include <linux/timer.h> 51 #include <linux/interrupt.h> 52 #include <linux/pci.h> 53 #include <linux/tty.h> 54 #include <linux/tty_flip.h> 55 #include <linux/serial.h> 56 #include <linux/major.h> 57 #include <linux/string.h> 58 #include <linux/fcntl.h> 59 #include <linux/ptrace.h> 60 #include <linux/ioport.h> 61 #include <linux/mm.h> 62 #include <linux/seq_file.h> 63 #include <linux/slab.h> 64 #include <linux/netdevice.h> 65 #include <linux/vmalloc.h> 66 #include <linux/init.h> 67 #include <linux/delay.h> 68 #include <linux/ioctl.h> 69 #include <linux/termios.h> 70 #include <linux/bitops.h> 71 #include <linux/workqueue.h> 72 #include <linux/hdlc.h> 73 #include <linux/synclink.h> 74 75 #include <asm/io.h> 76 #include <asm/irq.h> 77 #include <asm/dma.h> 78 #include <asm/types.h> 79 #include <linux/uaccess.h> 80 81 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE)) 82 #define SYNCLINK_GENERIC_HDLC 1 83 #else 84 #define SYNCLINK_GENERIC_HDLC 0 85 #endif 86 87 /* 88 * module identification 89 */ 90 static char *driver_name = "SyncLink GT"; 91 static char *slgt_driver_name = "synclink_gt"; 92 static char *tty_dev_prefix = "ttySLG"; 93 MODULE_LICENSE("GPL"); 94 #define MAX_DEVICES 32 95 96 static const struct pci_device_id pci_table[] = { 97 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 98 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 99 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 100 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 101 {0,}, /* terminate list */ 102 }; 103 MODULE_DEVICE_TABLE(pci, pci_table); 104 105 static int init_one(struct pci_dev *dev,const struct pci_device_id *ent); 106 static void remove_one(struct pci_dev *dev); 107 static struct pci_driver pci_driver = { 108 .name = "synclink_gt", 109 .id_table = pci_table, 110 .probe = init_one, 111 .remove = remove_one, 112 }; 113 114 static bool pci_registered; 115 116 /* 117 * module configuration and status 118 */ 119 static struct slgt_info *slgt_device_list; 120 static int slgt_device_count; 121 122 static int ttymajor; 123 static int debug_level; 124 static int maxframe[MAX_DEVICES]; 125 126 module_param(ttymajor, int, 0); 127 module_param(debug_level, int, 0); 128 module_param_array(maxframe, int, NULL, 0); 129 130 MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned"); 131 MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail"); 132 MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)"); 133 134 /* 135 * tty support and callbacks 136 */ 137 static struct tty_driver *serial_driver; 138 139 static void wait_until_sent(struct tty_struct *tty, int timeout); 140 static void flush_buffer(struct tty_struct *tty); 141 static void tx_release(struct tty_struct *tty); 142 143 /* 144 * generic HDLC support 145 */ 146 #define dev_to_port(D) (dev_to_hdlc(D)->priv) 147 148 149 /* 150 * device specific structures, macros and functions 151 */ 152 153 #define SLGT_MAX_PORTS 4 154 #define SLGT_REG_SIZE 256 155 156 /* 157 * conditional wait facility 158 */ 159 struct cond_wait { 160 struct cond_wait *next; 161 wait_queue_head_t q; 162 wait_queue_entry_t wait; 163 unsigned int data; 164 }; 165 static void flush_cond_wait(struct cond_wait **head); 166 167 /* 168 * DMA buffer descriptor and access macros 169 */ 170 struct slgt_desc 171 { 172 __le16 count; 173 __le16 status; 174 __le32 pbuf; /* physical address of data buffer */ 175 __le32 next; /* physical address of next descriptor */ 176 177 /* driver book keeping */ 178 char *buf; /* virtual address of data buffer */ 179 unsigned int pdesc; /* physical address of this descriptor */ 180 dma_addr_t buf_dma_addr; 181 unsigned short buf_count; 182 }; 183 184 #define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b)) 185 #define set_desc_next(a,b) (a).next = cpu_to_le32((unsigned int)(b)) 186 #define set_desc_count(a,b)(a).count = cpu_to_le16((unsigned short)(b)) 187 #define set_desc_eof(a,b) (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0)) 188 #define set_desc_status(a, b) (a).status = cpu_to_le16((unsigned short)(b)) 189 #define desc_count(a) (le16_to_cpu((a).count)) 190 #define desc_status(a) (le16_to_cpu((a).status)) 191 #define desc_complete(a) (le16_to_cpu((a).status) & BIT15) 192 #define desc_eof(a) (le16_to_cpu((a).status) & BIT2) 193 #define desc_crc_error(a) (le16_to_cpu((a).status) & BIT1) 194 #define desc_abort(a) (le16_to_cpu((a).status) & BIT0) 195 #define desc_residue(a) ((le16_to_cpu((a).status) & 0x38) >> 3) 196 197 struct _input_signal_events { 198 int ri_up; 199 int ri_down; 200 int dsr_up; 201 int dsr_down; 202 int dcd_up; 203 int dcd_down; 204 int cts_up; 205 int cts_down; 206 }; 207 208 /* 209 * device instance data structure 210 */ 211 struct slgt_info { 212 void *if_ptr; /* General purpose pointer (used by SPPP) */ 213 struct tty_port port; 214 215 struct slgt_info *next_device; /* device list link */ 216 217 char device_name[25]; 218 struct pci_dev *pdev; 219 220 int port_count; /* count of ports on adapter */ 221 int adapter_num; /* adapter instance number */ 222 int port_num; /* port instance number */ 223 224 /* array of pointers to port contexts on this adapter */ 225 struct slgt_info *port_array[SLGT_MAX_PORTS]; 226 227 int line; /* tty line instance number */ 228 229 struct mgsl_icount icount; 230 231 int timeout; 232 int x_char; /* xon/xoff character */ 233 unsigned int read_status_mask; 234 unsigned int ignore_status_mask; 235 236 wait_queue_head_t status_event_wait_q; 237 wait_queue_head_t event_wait_q; 238 struct timer_list tx_timer; 239 struct timer_list rx_timer; 240 241 unsigned int gpio_present; 242 struct cond_wait *gpio_wait_q; 243 244 spinlock_t lock; /* spinlock for synchronizing with ISR */ 245 246 struct work_struct task; 247 u32 pending_bh; 248 bool bh_requested; 249 bool bh_running; 250 251 int isr_overflow; 252 bool irq_requested; /* true if IRQ requested */ 253 bool irq_occurred; /* for diagnostics use */ 254 255 /* device configuration */ 256 257 unsigned int bus_type; 258 unsigned int irq_level; 259 unsigned long irq_flags; 260 261 unsigned char __iomem * reg_addr; /* memory mapped registers address */ 262 u32 phys_reg_addr; 263 bool reg_addr_requested; 264 265 MGSL_PARAMS params; /* communications parameters */ 266 u32 idle_mode; 267 u32 max_frame_size; /* as set by device config */ 268 269 unsigned int rbuf_fill_level; 270 unsigned int rx_pio; 271 unsigned int if_mode; 272 unsigned int base_clock; 273 unsigned int xsync; 274 unsigned int xctrl; 275 276 /* device status */ 277 278 bool rx_enabled; 279 bool rx_restart; 280 281 bool tx_enabled; 282 bool tx_active; 283 284 unsigned char signals; /* serial signal states */ 285 int init_error; /* initialization error */ 286 287 unsigned char *tx_buf; 288 int tx_count; 289 290 char *flag_buf; 291 bool drop_rts_on_tx_done; 292 struct _input_signal_events input_signal_events; 293 294 int dcd_chkcount; /* check counts to prevent */ 295 int cts_chkcount; /* too many IRQs if a signal */ 296 int dsr_chkcount; /* is floating */ 297 int ri_chkcount; 298 299 char *bufs; /* virtual address of DMA buffer lists */ 300 dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */ 301 302 unsigned int rbuf_count; 303 struct slgt_desc *rbufs; 304 unsigned int rbuf_current; 305 unsigned int rbuf_index; 306 unsigned int rbuf_fill_index; 307 unsigned short rbuf_fill_count; 308 309 unsigned int tbuf_count; 310 struct slgt_desc *tbufs; 311 unsigned int tbuf_current; 312 unsigned int tbuf_start; 313 314 unsigned char *tmp_rbuf; 315 unsigned int tmp_rbuf_count; 316 317 /* SPPP/Cisco HDLC device parts */ 318 319 int netcount; 320 spinlock_t netlock; 321 #if SYNCLINK_GENERIC_HDLC 322 struct net_device *netdev; 323 #endif 324 325 }; 326 327 static MGSL_PARAMS default_params = { 328 .mode = MGSL_MODE_HDLC, 329 .loopback = 0, 330 .flags = HDLC_FLAG_UNDERRUN_ABORT15, 331 .encoding = HDLC_ENCODING_NRZI_SPACE, 332 .clock_speed = 0, 333 .addr_filter = 0xff, 334 .crc_type = HDLC_CRC_16_CCITT, 335 .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS, 336 .preamble = HDLC_PREAMBLE_PATTERN_NONE, 337 .data_rate = 9600, 338 .data_bits = 8, 339 .stop_bits = 1, 340 .parity = ASYNC_PARITY_NONE 341 }; 342 343 344 #define BH_RECEIVE 1 345 #define BH_TRANSMIT 2 346 #define BH_STATUS 4 347 #define IO_PIN_SHUTDOWN_LIMIT 100 348 349 #define DMABUFSIZE 256 350 #define DESC_LIST_SIZE 4096 351 352 #define MASK_PARITY BIT1 353 #define MASK_FRAMING BIT0 354 #define MASK_BREAK BIT14 355 #define MASK_OVERRUN BIT4 356 357 #define GSR 0x00 /* global status */ 358 #define JCR 0x04 /* JTAG control */ 359 #define IODR 0x08 /* GPIO direction */ 360 #define IOER 0x0c /* GPIO interrupt enable */ 361 #define IOVR 0x10 /* GPIO value */ 362 #define IOSR 0x14 /* GPIO interrupt status */ 363 #define TDR 0x80 /* tx data */ 364 #define RDR 0x80 /* rx data */ 365 #define TCR 0x82 /* tx control */ 366 #define TIR 0x84 /* tx idle */ 367 #define TPR 0x85 /* tx preamble */ 368 #define RCR 0x86 /* rx control */ 369 #define VCR 0x88 /* V.24 control */ 370 #define CCR 0x89 /* clock control */ 371 #define BDR 0x8a /* baud divisor */ 372 #define SCR 0x8c /* serial control */ 373 #define SSR 0x8e /* serial status */ 374 #define RDCSR 0x90 /* rx DMA control/status */ 375 #define TDCSR 0x94 /* tx DMA control/status */ 376 #define RDDAR 0x98 /* rx DMA descriptor address */ 377 #define TDDAR 0x9c /* tx DMA descriptor address */ 378 #define XSR 0x40 /* extended sync pattern */ 379 #define XCR 0x44 /* extended control */ 380 381 #define RXIDLE BIT14 382 #define RXBREAK BIT14 383 #define IRQ_TXDATA BIT13 384 #define IRQ_TXIDLE BIT12 385 #define IRQ_TXUNDER BIT11 /* HDLC */ 386 #define IRQ_RXDATA BIT10 387 #define IRQ_RXIDLE BIT9 /* HDLC */ 388 #define IRQ_RXBREAK BIT9 /* async */ 389 #define IRQ_RXOVER BIT8 390 #define IRQ_DSR BIT7 391 #define IRQ_CTS BIT6 392 #define IRQ_DCD BIT5 393 #define IRQ_RI BIT4 394 #define IRQ_ALL 0x3ff0 395 #define IRQ_MASTER BIT0 396 397 #define slgt_irq_on(info, mask) \ 398 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask))) 399 #define slgt_irq_off(info, mask) \ 400 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask))) 401 402 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr); 403 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value); 404 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr); 405 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value); 406 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr); 407 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value); 408 409 static void msc_set_vcr(struct slgt_info *info); 410 411 static int startup(struct slgt_info *info); 412 static int block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info); 413 static void shutdown(struct slgt_info *info); 414 static void program_hw(struct slgt_info *info); 415 static void change_params(struct slgt_info *info); 416 417 static int adapter_test(struct slgt_info *info); 418 419 static void reset_port(struct slgt_info *info); 420 static void async_mode(struct slgt_info *info); 421 static void sync_mode(struct slgt_info *info); 422 423 static void rx_stop(struct slgt_info *info); 424 static void rx_start(struct slgt_info *info); 425 static void reset_rbufs(struct slgt_info *info); 426 static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last); 427 static bool rx_get_frame(struct slgt_info *info); 428 static bool rx_get_buf(struct slgt_info *info); 429 430 static void tx_start(struct slgt_info *info); 431 static void tx_stop(struct slgt_info *info); 432 static void tx_set_idle(struct slgt_info *info); 433 static unsigned int tbuf_bytes(struct slgt_info *info); 434 static void reset_tbufs(struct slgt_info *info); 435 static void tdma_reset(struct slgt_info *info); 436 static bool tx_load(struct slgt_info *info, const char *buf, unsigned int count); 437 438 static void get_gtsignals(struct slgt_info *info); 439 static void set_gtsignals(struct slgt_info *info); 440 static void set_rate(struct slgt_info *info, u32 data_rate); 441 442 static void bh_transmit(struct slgt_info *info); 443 static void isr_txeom(struct slgt_info *info, unsigned short status); 444 445 static void tx_timeout(struct timer_list *t); 446 static void rx_timeout(struct timer_list *t); 447 448 /* 449 * ioctl handlers 450 */ 451 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount); 452 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *params); 453 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *params); 454 static int get_txidle(struct slgt_info *info, int __user *idle_mode); 455 static int set_txidle(struct slgt_info *info, int idle_mode); 456 static int tx_enable(struct slgt_info *info, int enable); 457 static int tx_abort(struct slgt_info *info); 458 static int rx_enable(struct slgt_info *info, int enable); 459 static int modem_input_wait(struct slgt_info *info,int arg); 460 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr); 461 static int get_interface(struct slgt_info *info, int __user *if_mode); 462 static int set_interface(struct slgt_info *info, int if_mode); 463 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio); 464 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio); 465 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio); 466 static int get_xsync(struct slgt_info *info, int __user *if_mode); 467 static int set_xsync(struct slgt_info *info, int if_mode); 468 static int get_xctrl(struct slgt_info *info, int __user *if_mode); 469 static int set_xctrl(struct slgt_info *info, int if_mode); 470 471 /* 472 * driver functions 473 */ 474 static void release_resources(struct slgt_info *info); 475 476 /* 477 * DEBUG OUTPUT CODE 478 */ 479 #ifndef DBGINFO 480 #define DBGINFO(fmt) 481 #endif 482 #ifndef DBGERR 483 #define DBGERR(fmt) 484 #endif 485 #ifndef DBGBH 486 #define DBGBH(fmt) 487 #endif 488 #ifndef DBGISR 489 #define DBGISR(fmt) 490 #endif 491 492 #ifdef DBGDATA 493 static void trace_block(struct slgt_info *info, const char *data, int count, const char *label) 494 { 495 int i; 496 int linecount; 497 printk("%s %s data:\n",info->device_name, label); 498 while(count) { 499 linecount = (count > 16) ? 16 : count; 500 for(i=0; i < linecount; i++) 501 printk("%02X ",(unsigned char)data[i]); 502 for(;i<17;i++) 503 printk(" "); 504 for(i=0;i<linecount;i++) { 505 if (data[i]>=040 && data[i]<=0176) 506 printk("%c",data[i]); 507 else 508 printk("."); 509 } 510 printk("\n"); 511 data += linecount; 512 count -= linecount; 513 } 514 } 515 #else 516 #define DBGDATA(info, buf, size, label) 517 #endif 518 519 #ifdef DBGTBUF 520 static void dump_tbufs(struct slgt_info *info) 521 { 522 int i; 523 printk("tbuf_current=%d\n", info->tbuf_current); 524 for (i=0 ; i < info->tbuf_count ; i++) { 525 printk("%d: count=%04X status=%04X\n", 526 i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status)); 527 } 528 } 529 #else 530 #define DBGTBUF(info) 531 #endif 532 533 #ifdef DBGRBUF 534 static void dump_rbufs(struct slgt_info *info) 535 { 536 int i; 537 printk("rbuf_current=%d\n", info->rbuf_current); 538 for (i=0 ; i < info->rbuf_count ; i++) { 539 printk("%d: count=%04X status=%04X\n", 540 i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status)); 541 } 542 } 543 #else 544 #define DBGRBUF(info) 545 #endif 546 547 static inline int sanity_check(struct slgt_info *info, char *devname, const char *name) 548 { 549 #ifdef SANITY_CHECK 550 if (!info) { 551 printk("null struct slgt_info for (%s) in %s\n", devname, name); 552 return 1; 553 } 554 #else 555 if (!info) 556 return 1; 557 #endif 558 return 0; 559 } 560 561 /* 562 * line discipline callback wrappers 563 * 564 * The wrappers maintain line discipline references 565 * while calling into the line discipline. 566 * 567 * ldisc_receive_buf - pass receive data to line discipline 568 */ 569 static void ldisc_receive_buf(struct tty_struct *tty, 570 const __u8 *data, char *flags, int count) 571 { 572 struct tty_ldisc *ld; 573 if (!tty) 574 return; 575 ld = tty_ldisc_ref(tty); 576 if (ld) { 577 if (ld->ops->receive_buf) 578 ld->ops->receive_buf(tty, data, flags, count); 579 tty_ldisc_deref(ld); 580 } 581 } 582 583 /* tty callbacks */ 584 585 static int open(struct tty_struct *tty, struct file *filp) 586 { 587 struct slgt_info *info; 588 int retval, line; 589 unsigned long flags; 590 591 line = tty->index; 592 if (line >= slgt_device_count) { 593 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line)); 594 return -ENODEV; 595 } 596 597 info = slgt_device_list; 598 while(info && info->line != line) 599 info = info->next_device; 600 if (sanity_check(info, tty->name, "open")) 601 return -ENODEV; 602 if (info->init_error) { 603 DBGERR(("%s init error=%d\n", info->device_name, info->init_error)); 604 return -ENODEV; 605 } 606 607 tty->driver_data = info; 608 info->port.tty = tty; 609 610 DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count)); 611 612 mutex_lock(&info->port.mutex); 613 614 spin_lock_irqsave(&info->netlock, flags); 615 if (info->netcount) { 616 retval = -EBUSY; 617 spin_unlock_irqrestore(&info->netlock, flags); 618 mutex_unlock(&info->port.mutex); 619 goto cleanup; 620 } 621 info->port.count++; 622 spin_unlock_irqrestore(&info->netlock, flags); 623 624 if (info->port.count == 1) { 625 /* 1st open on this device, init hardware */ 626 retval = startup(info); 627 if (retval < 0) { 628 mutex_unlock(&info->port.mutex); 629 goto cleanup; 630 } 631 } 632 mutex_unlock(&info->port.mutex); 633 retval = block_til_ready(tty, filp, info); 634 if (retval) { 635 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval)); 636 goto cleanup; 637 } 638 639 retval = 0; 640 641 cleanup: 642 if (retval) { 643 if (tty->count == 1) 644 info->port.tty = NULL; /* tty layer will release tty struct */ 645 if(info->port.count) 646 info->port.count--; 647 } 648 649 DBGINFO(("%s open rc=%d\n", info->device_name, retval)); 650 return retval; 651 } 652 653 static void close(struct tty_struct *tty, struct file *filp) 654 { 655 struct slgt_info *info = tty->driver_data; 656 657 if (sanity_check(info, tty->name, "close")) 658 return; 659 DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count)); 660 661 if (tty_port_close_start(&info->port, tty, filp) == 0) 662 goto cleanup; 663 664 mutex_lock(&info->port.mutex); 665 if (tty_port_initialized(&info->port)) 666 wait_until_sent(tty, info->timeout); 667 flush_buffer(tty); 668 tty_ldisc_flush(tty); 669 670 shutdown(info); 671 mutex_unlock(&info->port.mutex); 672 673 tty_port_close_end(&info->port, tty); 674 info->port.tty = NULL; 675 cleanup: 676 DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count)); 677 } 678 679 static void hangup(struct tty_struct *tty) 680 { 681 struct slgt_info *info = tty->driver_data; 682 unsigned long flags; 683 684 if (sanity_check(info, tty->name, "hangup")) 685 return; 686 DBGINFO(("%s hangup\n", info->device_name)); 687 688 flush_buffer(tty); 689 690 mutex_lock(&info->port.mutex); 691 shutdown(info); 692 693 spin_lock_irqsave(&info->port.lock, flags); 694 info->port.count = 0; 695 info->port.tty = NULL; 696 spin_unlock_irqrestore(&info->port.lock, flags); 697 tty_port_set_active(&info->port, false); 698 mutex_unlock(&info->port.mutex); 699 700 wake_up_interruptible(&info->port.open_wait); 701 } 702 703 static void set_termios(struct tty_struct *tty, 704 const struct ktermios *old_termios) 705 { 706 struct slgt_info *info = tty->driver_data; 707 unsigned long flags; 708 709 DBGINFO(("%s set_termios\n", tty->driver->name)); 710 711 change_params(info); 712 713 /* Handle transition to B0 status */ 714 if ((old_termios->c_cflag & CBAUD) && !C_BAUD(tty)) { 715 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR); 716 spin_lock_irqsave(&info->lock,flags); 717 set_gtsignals(info); 718 spin_unlock_irqrestore(&info->lock,flags); 719 } 720 721 /* Handle transition away from B0 status */ 722 if (!(old_termios->c_cflag & CBAUD) && C_BAUD(tty)) { 723 info->signals |= SerialSignal_DTR; 724 if (!C_CRTSCTS(tty) || !tty_throttled(tty)) 725 info->signals |= SerialSignal_RTS; 726 spin_lock_irqsave(&info->lock,flags); 727 set_gtsignals(info); 728 spin_unlock_irqrestore(&info->lock,flags); 729 } 730 731 /* Handle turning off CRTSCTS */ 732 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) { 733 tty->hw_stopped = 0; 734 tx_release(tty); 735 } 736 } 737 738 static void update_tx_timer(struct slgt_info *info) 739 { 740 /* 741 * use worst case speed of 1200bps to calculate transmit timeout 742 * based on data in buffers (tbuf_bytes) and FIFO (128 bytes) 743 */ 744 if (info->params.mode == MGSL_MODE_HDLC) { 745 int timeout = (tbuf_bytes(info) * 7) + 1000; 746 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(timeout)); 747 } 748 } 749 750 static int write(struct tty_struct *tty, 751 const unsigned char *buf, int count) 752 { 753 int ret = 0; 754 struct slgt_info *info = tty->driver_data; 755 unsigned long flags; 756 757 if (sanity_check(info, tty->name, "write")) 758 return -EIO; 759 760 DBGINFO(("%s write count=%d\n", info->device_name, count)); 761 762 if (!info->tx_buf || (count > info->max_frame_size)) 763 return -EIO; 764 765 if (!count || tty->flow.stopped || tty->hw_stopped) 766 return 0; 767 768 spin_lock_irqsave(&info->lock, flags); 769 770 if (info->tx_count) { 771 /* send accumulated data from send_char() */ 772 if (!tx_load(info, info->tx_buf, info->tx_count)) 773 goto cleanup; 774 info->tx_count = 0; 775 } 776 777 if (tx_load(info, buf, count)) 778 ret = count; 779 780 cleanup: 781 spin_unlock_irqrestore(&info->lock, flags); 782 DBGINFO(("%s write rc=%d\n", info->device_name, ret)); 783 return ret; 784 } 785 786 static int put_char(struct tty_struct *tty, unsigned char ch) 787 { 788 struct slgt_info *info = tty->driver_data; 789 unsigned long flags; 790 int ret = 0; 791 792 if (sanity_check(info, tty->name, "put_char")) 793 return 0; 794 DBGINFO(("%s put_char(%d)\n", info->device_name, ch)); 795 if (!info->tx_buf) 796 return 0; 797 spin_lock_irqsave(&info->lock,flags); 798 if (info->tx_count < info->max_frame_size) { 799 info->tx_buf[info->tx_count++] = ch; 800 ret = 1; 801 } 802 spin_unlock_irqrestore(&info->lock,flags); 803 return ret; 804 } 805 806 static void send_xchar(struct tty_struct *tty, char ch) 807 { 808 struct slgt_info *info = tty->driver_data; 809 unsigned long flags; 810 811 if (sanity_check(info, tty->name, "send_xchar")) 812 return; 813 DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch)); 814 info->x_char = ch; 815 if (ch) { 816 spin_lock_irqsave(&info->lock,flags); 817 if (!info->tx_enabled) 818 tx_start(info); 819 spin_unlock_irqrestore(&info->lock,flags); 820 } 821 } 822 823 static void wait_until_sent(struct tty_struct *tty, int timeout) 824 { 825 struct slgt_info *info = tty->driver_data; 826 unsigned long orig_jiffies, char_time; 827 828 if (!info ) 829 return; 830 if (sanity_check(info, tty->name, "wait_until_sent")) 831 return; 832 DBGINFO(("%s wait_until_sent entry\n", info->device_name)); 833 if (!tty_port_initialized(&info->port)) 834 goto exit; 835 836 orig_jiffies = jiffies; 837 838 /* Set check interval to 1/5 of estimated time to 839 * send a character, and make it at least 1. The check 840 * interval should also be less than the timeout. 841 * Note: use tight timings here to satisfy the NIST-PCTS. 842 */ 843 844 if (info->params.data_rate) { 845 char_time = info->timeout/(32 * 5); 846 if (!char_time) 847 char_time++; 848 } else 849 char_time = 1; 850 851 if (timeout) 852 char_time = min_t(unsigned long, char_time, timeout); 853 854 while (info->tx_active) { 855 msleep_interruptible(jiffies_to_msecs(char_time)); 856 if (signal_pending(current)) 857 break; 858 if (timeout && time_after(jiffies, orig_jiffies + timeout)) 859 break; 860 } 861 exit: 862 DBGINFO(("%s wait_until_sent exit\n", info->device_name)); 863 } 864 865 static unsigned int write_room(struct tty_struct *tty) 866 { 867 struct slgt_info *info = tty->driver_data; 868 unsigned int ret; 869 870 if (sanity_check(info, tty->name, "write_room")) 871 return 0; 872 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE; 873 DBGINFO(("%s write_room=%u\n", info->device_name, ret)); 874 return ret; 875 } 876 877 static void flush_chars(struct tty_struct *tty) 878 { 879 struct slgt_info *info = tty->driver_data; 880 unsigned long flags; 881 882 if (sanity_check(info, tty->name, "flush_chars")) 883 return; 884 DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count)); 885 886 if (info->tx_count <= 0 || tty->flow.stopped || 887 tty->hw_stopped || !info->tx_buf) 888 return; 889 890 DBGINFO(("%s flush_chars start transmit\n", info->device_name)); 891 892 spin_lock_irqsave(&info->lock,flags); 893 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count)) 894 info->tx_count = 0; 895 spin_unlock_irqrestore(&info->lock,flags); 896 } 897 898 static void flush_buffer(struct tty_struct *tty) 899 { 900 struct slgt_info *info = tty->driver_data; 901 unsigned long flags; 902 903 if (sanity_check(info, tty->name, "flush_buffer")) 904 return; 905 DBGINFO(("%s flush_buffer\n", info->device_name)); 906 907 spin_lock_irqsave(&info->lock, flags); 908 info->tx_count = 0; 909 spin_unlock_irqrestore(&info->lock, flags); 910 911 tty_wakeup(tty); 912 } 913 914 /* 915 * throttle (stop) transmitter 916 */ 917 static void tx_hold(struct tty_struct *tty) 918 { 919 struct slgt_info *info = tty->driver_data; 920 unsigned long flags; 921 922 if (sanity_check(info, tty->name, "tx_hold")) 923 return; 924 DBGINFO(("%s tx_hold\n", info->device_name)); 925 spin_lock_irqsave(&info->lock,flags); 926 if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC) 927 tx_stop(info); 928 spin_unlock_irqrestore(&info->lock,flags); 929 } 930 931 /* 932 * release (start) transmitter 933 */ 934 static void tx_release(struct tty_struct *tty) 935 { 936 struct slgt_info *info = tty->driver_data; 937 unsigned long flags; 938 939 if (sanity_check(info, tty->name, "tx_release")) 940 return; 941 DBGINFO(("%s tx_release\n", info->device_name)); 942 spin_lock_irqsave(&info->lock, flags); 943 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count)) 944 info->tx_count = 0; 945 spin_unlock_irqrestore(&info->lock, flags); 946 } 947 948 /* 949 * Service an IOCTL request 950 * 951 * Arguments 952 * 953 * tty pointer to tty instance data 954 * cmd IOCTL command code 955 * arg command argument/context 956 * 957 * Return 0 if success, otherwise error code 958 */ 959 static int ioctl(struct tty_struct *tty, 960 unsigned int cmd, unsigned long arg) 961 { 962 struct slgt_info *info = tty->driver_data; 963 void __user *argp = (void __user *)arg; 964 int ret; 965 966 if (sanity_check(info, tty->name, "ioctl")) 967 return -ENODEV; 968 DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd)); 969 970 if (cmd != TIOCMIWAIT) { 971 if (tty_io_error(tty)) 972 return -EIO; 973 } 974 975 switch (cmd) { 976 case MGSL_IOCWAITEVENT: 977 return wait_mgsl_event(info, argp); 978 case TIOCMIWAIT: 979 return modem_input_wait(info,(int)arg); 980 case MGSL_IOCSGPIO: 981 return set_gpio(info, argp); 982 case MGSL_IOCGGPIO: 983 return get_gpio(info, argp); 984 case MGSL_IOCWAITGPIO: 985 return wait_gpio(info, argp); 986 case MGSL_IOCGXSYNC: 987 return get_xsync(info, argp); 988 case MGSL_IOCSXSYNC: 989 return set_xsync(info, (int)arg); 990 case MGSL_IOCGXCTRL: 991 return get_xctrl(info, argp); 992 case MGSL_IOCSXCTRL: 993 return set_xctrl(info, (int)arg); 994 } 995 mutex_lock(&info->port.mutex); 996 switch (cmd) { 997 case MGSL_IOCGPARAMS: 998 ret = get_params(info, argp); 999 break; 1000 case MGSL_IOCSPARAMS: 1001 ret = set_params(info, argp); 1002 break; 1003 case MGSL_IOCGTXIDLE: 1004 ret = get_txidle(info, argp); 1005 break; 1006 case MGSL_IOCSTXIDLE: 1007 ret = set_txidle(info, (int)arg); 1008 break; 1009 case MGSL_IOCTXENABLE: 1010 ret = tx_enable(info, (int)arg); 1011 break; 1012 case MGSL_IOCRXENABLE: 1013 ret = rx_enable(info, (int)arg); 1014 break; 1015 case MGSL_IOCTXABORT: 1016 ret = tx_abort(info); 1017 break; 1018 case MGSL_IOCGSTATS: 1019 ret = get_stats(info, argp); 1020 break; 1021 case MGSL_IOCGIF: 1022 ret = get_interface(info, argp); 1023 break; 1024 case MGSL_IOCSIF: 1025 ret = set_interface(info,(int)arg); 1026 break; 1027 default: 1028 ret = -ENOIOCTLCMD; 1029 } 1030 mutex_unlock(&info->port.mutex); 1031 return ret; 1032 } 1033 1034 static int get_icount(struct tty_struct *tty, 1035 struct serial_icounter_struct *icount) 1036 1037 { 1038 struct slgt_info *info = tty->driver_data; 1039 struct mgsl_icount cnow; /* kernel counter temps */ 1040 unsigned long flags; 1041 1042 spin_lock_irqsave(&info->lock,flags); 1043 cnow = info->icount; 1044 spin_unlock_irqrestore(&info->lock,flags); 1045 1046 icount->cts = cnow.cts; 1047 icount->dsr = cnow.dsr; 1048 icount->rng = cnow.rng; 1049 icount->dcd = cnow.dcd; 1050 icount->rx = cnow.rx; 1051 icount->tx = cnow.tx; 1052 icount->frame = cnow.frame; 1053 icount->overrun = cnow.overrun; 1054 icount->parity = cnow.parity; 1055 icount->brk = cnow.brk; 1056 icount->buf_overrun = cnow.buf_overrun; 1057 1058 return 0; 1059 } 1060 1061 /* 1062 * support for 32 bit ioctl calls on 64 bit systems 1063 */ 1064 #ifdef CONFIG_COMPAT 1065 static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params) 1066 { 1067 struct MGSL_PARAMS32 tmp_params; 1068 1069 DBGINFO(("%s get_params32\n", info->device_name)); 1070 memset(&tmp_params, 0, sizeof(tmp_params)); 1071 tmp_params.mode = (compat_ulong_t)info->params.mode; 1072 tmp_params.loopback = info->params.loopback; 1073 tmp_params.flags = info->params.flags; 1074 tmp_params.encoding = info->params.encoding; 1075 tmp_params.clock_speed = (compat_ulong_t)info->params.clock_speed; 1076 tmp_params.addr_filter = info->params.addr_filter; 1077 tmp_params.crc_type = info->params.crc_type; 1078 tmp_params.preamble_length = info->params.preamble_length; 1079 tmp_params.preamble = info->params.preamble; 1080 tmp_params.data_rate = (compat_ulong_t)info->params.data_rate; 1081 tmp_params.data_bits = info->params.data_bits; 1082 tmp_params.stop_bits = info->params.stop_bits; 1083 tmp_params.parity = info->params.parity; 1084 if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32))) 1085 return -EFAULT; 1086 return 0; 1087 } 1088 1089 static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params) 1090 { 1091 struct MGSL_PARAMS32 tmp_params; 1092 1093 DBGINFO(("%s set_params32\n", info->device_name)); 1094 if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32))) 1095 return -EFAULT; 1096 1097 spin_lock(&info->lock); 1098 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) { 1099 info->base_clock = tmp_params.clock_speed; 1100 } else { 1101 info->params.mode = tmp_params.mode; 1102 info->params.loopback = tmp_params.loopback; 1103 info->params.flags = tmp_params.flags; 1104 info->params.encoding = tmp_params.encoding; 1105 info->params.clock_speed = tmp_params.clock_speed; 1106 info->params.addr_filter = tmp_params.addr_filter; 1107 info->params.crc_type = tmp_params.crc_type; 1108 info->params.preamble_length = tmp_params.preamble_length; 1109 info->params.preamble = tmp_params.preamble; 1110 info->params.data_rate = tmp_params.data_rate; 1111 info->params.data_bits = tmp_params.data_bits; 1112 info->params.stop_bits = tmp_params.stop_bits; 1113 info->params.parity = tmp_params.parity; 1114 } 1115 spin_unlock(&info->lock); 1116 1117 program_hw(info); 1118 1119 return 0; 1120 } 1121 1122 static long slgt_compat_ioctl(struct tty_struct *tty, 1123 unsigned int cmd, unsigned long arg) 1124 { 1125 struct slgt_info *info = tty->driver_data; 1126 int rc; 1127 1128 if (sanity_check(info, tty->name, "compat_ioctl")) 1129 return -ENODEV; 1130 DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd)); 1131 1132 switch (cmd) { 1133 case MGSL_IOCSPARAMS32: 1134 rc = set_params32(info, compat_ptr(arg)); 1135 break; 1136 1137 case MGSL_IOCGPARAMS32: 1138 rc = get_params32(info, compat_ptr(arg)); 1139 break; 1140 1141 case MGSL_IOCGPARAMS: 1142 case MGSL_IOCSPARAMS: 1143 case MGSL_IOCGTXIDLE: 1144 case MGSL_IOCGSTATS: 1145 case MGSL_IOCWAITEVENT: 1146 case MGSL_IOCGIF: 1147 case MGSL_IOCSGPIO: 1148 case MGSL_IOCGGPIO: 1149 case MGSL_IOCWAITGPIO: 1150 case MGSL_IOCGXSYNC: 1151 case MGSL_IOCGXCTRL: 1152 rc = ioctl(tty, cmd, (unsigned long)compat_ptr(arg)); 1153 break; 1154 default: 1155 rc = ioctl(tty, cmd, arg); 1156 } 1157 DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc)); 1158 return rc; 1159 } 1160 #else 1161 #define slgt_compat_ioctl NULL 1162 #endif /* ifdef CONFIG_COMPAT */ 1163 1164 /* 1165 * proc fs support 1166 */ 1167 static inline void line_info(struct seq_file *m, struct slgt_info *info) 1168 { 1169 char stat_buf[30]; 1170 unsigned long flags; 1171 1172 seq_printf(m, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n", 1173 info->device_name, info->phys_reg_addr, 1174 info->irq_level, info->max_frame_size); 1175 1176 /* output current serial signal states */ 1177 spin_lock_irqsave(&info->lock,flags); 1178 get_gtsignals(info); 1179 spin_unlock_irqrestore(&info->lock,flags); 1180 1181 stat_buf[0] = 0; 1182 stat_buf[1] = 0; 1183 if (info->signals & SerialSignal_RTS) 1184 strcat(stat_buf, "|RTS"); 1185 if (info->signals & SerialSignal_CTS) 1186 strcat(stat_buf, "|CTS"); 1187 if (info->signals & SerialSignal_DTR) 1188 strcat(stat_buf, "|DTR"); 1189 if (info->signals & SerialSignal_DSR) 1190 strcat(stat_buf, "|DSR"); 1191 if (info->signals & SerialSignal_DCD) 1192 strcat(stat_buf, "|CD"); 1193 if (info->signals & SerialSignal_RI) 1194 strcat(stat_buf, "|RI"); 1195 1196 if (info->params.mode != MGSL_MODE_ASYNC) { 1197 seq_printf(m, "\tHDLC txok:%d rxok:%d", 1198 info->icount.txok, info->icount.rxok); 1199 if (info->icount.txunder) 1200 seq_printf(m, " txunder:%d", info->icount.txunder); 1201 if (info->icount.txabort) 1202 seq_printf(m, " txabort:%d", info->icount.txabort); 1203 if (info->icount.rxshort) 1204 seq_printf(m, " rxshort:%d", info->icount.rxshort); 1205 if (info->icount.rxlong) 1206 seq_printf(m, " rxlong:%d", info->icount.rxlong); 1207 if (info->icount.rxover) 1208 seq_printf(m, " rxover:%d", info->icount.rxover); 1209 if (info->icount.rxcrc) 1210 seq_printf(m, " rxcrc:%d", info->icount.rxcrc); 1211 } else { 1212 seq_printf(m, "\tASYNC tx:%d rx:%d", 1213 info->icount.tx, info->icount.rx); 1214 if (info->icount.frame) 1215 seq_printf(m, " fe:%d", info->icount.frame); 1216 if (info->icount.parity) 1217 seq_printf(m, " pe:%d", info->icount.parity); 1218 if (info->icount.brk) 1219 seq_printf(m, " brk:%d", info->icount.brk); 1220 if (info->icount.overrun) 1221 seq_printf(m, " oe:%d", info->icount.overrun); 1222 } 1223 1224 /* Append serial signal status to end */ 1225 seq_printf(m, " %s\n", stat_buf+1); 1226 1227 seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n", 1228 info->tx_active,info->bh_requested,info->bh_running, 1229 info->pending_bh); 1230 } 1231 1232 /* Called to print information about devices 1233 */ 1234 static int synclink_gt_proc_show(struct seq_file *m, void *v) 1235 { 1236 struct slgt_info *info; 1237 1238 seq_puts(m, "synclink_gt driver\n"); 1239 1240 info = slgt_device_list; 1241 while( info ) { 1242 line_info(m, info); 1243 info = info->next_device; 1244 } 1245 return 0; 1246 } 1247 1248 /* 1249 * return count of bytes in transmit buffer 1250 */ 1251 static unsigned int chars_in_buffer(struct tty_struct *tty) 1252 { 1253 struct slgt_info *info = tty->driver_data; 1254 unsigned int count; 1255 if (sanity_check(info, tty->name, "chars_in_buffer")) 1256 return 0; 1257 count = tbuf_bytes(info); 1258 DBGINFO(("%s chars_in_buffer()=%u\n", info->device_name, count)); 1259 return count; 1260 } 1261 1262 /* 1263 * signal remote device to throttle send data (our receive data) 1264 */ 1265 static void throttle(struct tty_struct * tty) 1266 { 1267 struct slgt_info *info = tty->driver_data; 1268 unsigned long flags; 1269 1270 if (sanity_check(info, tty->name, "throttle")) 1271 return; 1272 DBGINFO(("%s throttle\n", info->device_name)); 1273 if (I_IXOFF(tty)) 1274 send_xchar(tty, STOP_CHAR(tty)); 1275 if (C_CRTSCTS(tty)) { 1276 spin_lock_irqsave(&info->lock,flags); 1277 info->signals &= ~SerialSignal_RTS; 1278 set_gtsignals(info); 1279 spin_unlock_irqrestore(&info->lock,flags); 1280 } 1281 } 1282 1283 /* 1284 * signal remote device to stop throttling send data (our receive data) 1285 */ 1286 static void unthrottle(struct tty_struct * tty) 1287 { 1288 struct slgt_info *info = tty->driver_data; 1289 unsigned long flags; 1290 1291 if (sanity_check(info, tty->name, "unthrottle")) 1292 return; 1293 DBGINFO(("%s unthrottle\n", info->device_name)); 1294 if (I_IXOFF(tty)) { 1295 if (info->x_char) 1296 info->x_char = 0; 1297 else 1298 send_xchar(tty, START_CHAR(tty)); 1299 } 1300 if (C_CRTSCTS(tty)) { 1301 spin_lock_irqsave(&info->lock,flags); 1302 info->signals |= SerialSignal_RTS; 1303 set_gtsignals(info); 1304 spin_unlock_irqrestore(&info->lock,flags); 1305 } 1306 } 1307 1308 /* 1309 * set or clear transmit break condition 1310 * break_state -1=set break condition, 0=clear 1311 */ 1312 static int set_break(struct tty_struct *tty, int break_state) 1313 { 1314 struct slgt_info *info = tty->driver_data; 1315 unsigned short value; 1316 unsigned long flags; 1317 1318 if (sanity_check(info, tty->name, "set_break")) 1319 return -EINVAL; 1320 DBGINFO(("%s set_break(%d)\n", info->device_name, break_state)); 1321 1322 spin_lock_irqsave(&info->lock,flags); 1323 value = rd_reg16(info, TCR); 1324 if (break_state == -1) 1325 value |= BIT6; 1326 else 1327 value &= ~BIT6; 1328 wr_reg16(info, TCR, value); 1329 spin_unlock_irqrestore(&info->lock,flags); 1330 return 0; 1331 } 1332 1333 #if SYNCLINK_GENERIC_HDLC 1334 1335 /** 1336 * hdlcdev_attach - called by generic HDLC layer when protocol selected (PPP, frame relay, etc.) 1337 * @dev: pointer to network device structure 1338 * @encoding: serial encoding setting 1339 * @parity: FCS setting 1340 * 1341 * Set encoding and frame check sequence (FCS) options. 1342 * 1343 * Return: 0 if success, otherwise error code 1344 */ 1345 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding, 1346 unsigned short parity) 1347 { 1348 struct slgt_info *info = dev_to_port(dev); 1349 unsigned char new_encoding; 1350 unsigned short new_crctype; 1351 1352 /* return error if TTY interface open */ 1353 if (info->port.count) 1354 return -EBUSY; 1355 1356 DBGINFO(("%s hdlcdev_attach\n", info->device_name)); 1357 1358 switch (encoding) 1359 { 1360 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break; 1361 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break; 1362 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break; 1363 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break; 1364 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break; 1365 default: return -EINVAL; 1366 } 1367 1368 switch (parity) 1369 { 1370 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break; 1371 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break; 1372 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break; 1373 default: return -EINVAL; 1374 } 1375 1376 info->params.encoding = new_encoding; 1377 info->params.crc_type = new_crctype; 1378 1379 /* if network interface up, reprogram hardware */ 1380 if (info->netcount) 1381 program_hw(info); 1382 1383 return 0; 1384 } 1385 1386 /** 1387 * hdlcdev_xmit - called by generic HDLC layer to send a frame 1388 * @skb: socket buffer containing HDLC frame 1389 * @dev: pointer to network device structure 1390 */ 1391 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb, 1392 struct net_device *dev) 1393 { 1394 struct slgt_info *info = dev_to_port(dev); 1395 unsigned long flags; 1396 1397 DBGINFO(("%s hdlc_xmit\n", dev->name)); 1398 1399 if (!skb->len) 1400 return NETDEV_TX_OK; 1401 1402 /* stop sending until this frame completes */ 1403 netif_stop_queue(dev); 1404 1405 /* update network statistics */ 1406 dev->stats.tx_packets++; 1407 dev->stats.tx_bytes += skb->len; 1408 1409 /* save start time for transmit timeout detection */ 1410 netif_trans_update(dev); 1411 1412 spin_lock_irqsave(&info->lock, flags); 1413 tx_load(info, skb->data, skb->len); 1414 spin_unlock_irqrestore(&info->lock, flags); 1415 1416 /* done with socket buffer, so free it */ 1417 dev_kfree_skb(skb); 1418 1419 return NETDEV_TX_OK; 1420 } 1421 1422 /** 1423 * hdlcdev_open - called by network layer when interface enabled 1424 * @dev: pointer to network device structure 1425 * 1426 * Claim resources and initialize hardware. 1427 * 1428 * Return: 0 if success, otherwise error code 1429 */ 1430 static int hdlcdev_open(struct net_device *dev) 1431 { 1432 struct slgt_info *info = dev_to_port(dev); 1433 int rc; 1434 unsigned long flags; 1435 1436 DBGINFO(("%s hdlcdev_open\n", dev->name)); 1437 1438 /* arbitrate between network and tty opens */ 1439 spin_lock_irqsave(&info->netlock, flags); 1440 if (info->port.count != 0 || info->netcount != 0) { 1441 DBGINFO(("%s hdlc_open busy\n", dev->name)); 1442 spin_unlock_irqrestore(&info->netlock, flags); 1443 return -EBUSY; 1444 } 1445 info->netcount=1; 1446 spin_unlock_irqrestore(&info->netlock, flags); 1447 1448 /* claim resources and init adapter */ 1449 if ((rc = startup(info)) != 0) { 1450 spin_lock_irqsave(&info->netlock, flags); 1451 info->netcount=0; 1452 spin_unlock_irqrestore(&info->netlock, flags); 1453 return rc; 1454 } 1455 1456 /* generic HDLC layer open processing */ 1457 rc = hdlc_open(dev); 1458 if (rc) { 1459 shutdown(info); 1460 spin_lock_irqsave(&info->netlock, flags); 1461 info->netcount = 0; 1462 spin_unlock_irqrestore(&info->netlock, flags); 1463 return rc; 1464 } 1465 1466 /* assert RTS and DTR, apply hardware settings */ 1467 info->signals |= SerialSignal_RTS | SerialSignal_DTR; 1468 program_hw(info); 1469 1470 /* enable network layer transmit */ 1471 netif_trans_update(dev); 1472 netif_start_queue(dev); 1473 1474 /* inform generic HDLC layer of current DCD status */ 1475 spin_lock_irqsave(&info->lock, flags); 1476 get_gtsignals(info); 1477 spin_unlock_irqrestore(&info->lock, flags); 1478 if (info->signals & SerialSignal_DCD) 1479 netif_carrier_on(dev); 1480 else 1481 netif_carrier_off(dev); 1482 return 0; 1483 } 1484 1485 /** 1486 * hdlcdev_close - called by network layer when interface is disabled 1487 * @dev: pointer to network device structure 1488 * 1489 * Shutdown hardware and release resources. 1490 * 1491 * Return: 0 if success, otherwise error code 1492 */ 1493 static int hdlcdev_close(struct net_device *dev) 1494 { 1495 struct slgt_info *info = dev_to_port(dev); 1496 unsigned long flags; 1497 1498 DBGINFO(("%s hdlcdev_close\n", dev->name)); 1499 1500 netif_stop_queue(dev); 1501 1502 /* shutdown adapter and release resources */ 1503 shutdown(info); 1504 1505 hdlc_close(dev); 1506 1507 spin_lock_irqsave(&info->netlock, flags); 1508 info->netcount=0; 1509 spin_unlock_irqrestore(&info->netlock, flags); 1510 1511 return 0; 1512 } 1513 1514 /** 1515 * hdlcdev_ioctl - called by network layer to process IOCTL call to network device 1516 * @dev: pointer to network device structure 1517 * @ifr: pointer to network interface request structure 1518 * @cmd: IOCTL command code 1519 * 1520 * Return: 0 if success, otherwise error code 1521 */ 1522 static int hdlcdev_ioctl(struct net_device *dev, struct if_settings *ifs) 1523 { 1524 const size_t size = sizeof(sync_serial_settings); 1525 sync_serial_settings new_line; 1526 sync_serial_settings __user *line = ifs->ifs_ifsu.sync; 1527 struct slgt_info *info = dev_to_port(dev); 1528 unsigned int flags; 1529 1530 DBGINFO(("%s hdlcdev_ioctl\n", dev->name)); 1531 1532 /* return error if TTY interface open */ 1533 if (info->port.count) 1534 return -EBUSY; 1535 1536 memset(&new_line, 0, sizeof(new_line)); 1537 1538 switch (ifs->type) { 1539 case IF_GET_IFACE: /* return current sync_serial_settings */ 1540 1541 ifs->type = IF_IFACE_SYNC_SERIAL; 1542 if (ifs->size < size) { 1543 ifs->size = size; /* data size wanted */ 1544 return -ENOBUFS; 1545 } 1546 1547 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL | 1548 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN | 1549 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL | 1550 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); 1551 1552 switch (flags){ 1553 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break; 1554 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break; 1555 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break; 1556 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break; 1557 default: new_line.clock_type = CLOCK_DEFAULT; 1558 } 1559 1560 new_line.clock_rate = info->params.clock_speed; 1561 new_line.loopback = info->params.loopback ? 1:0; 1562 1563 if (copy_to_user(line, &new_line, size)) 1564 return -EFAULT; 1565 return 0; 1566 1567 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */ 1568 1569 if(!capable(CAP_NET_ADMIN)) 1570 return -EPERM; 1571 if (copy_from_user(&new_line, line, size)) 1572 return -EFAULT; 1573 1574 switch (new_line.clock_type) 1575 { 1576 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break; 1577 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break; 1578 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break; 1579 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break; 1580 case CLOCK_DEFAULT: flags = info->params.flags & 1581 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL | 1582 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN | 1583 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL | 1584 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break; 1585 default: return -EINVAL; 1586 } 1587 1588 if (new_line.loopback != 0 && new_line.loopback != 1) 1589 return -EINVAL; 1590 1591 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL | 1592 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN | 1593 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL | 1594 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); 1595 info->params.flags |= flags; 1596 1597 info->params.loopback = new_line.loopback; 1598 1599 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG)) 1600 info->params.clock_speed = new_line.clock_rate; 1601 else 1602 info->params.clock_speed = 0; 1603 1604 /* if network interface up, reprogram hardware */ 1605 if (info->netcount) 1606 program_hw(info); 1607 return 0; 1608 1609 default: 1610 return hdlc_ioctl(dev, ifs); 1611 } 1612 } 1613 1614 /** 1615 * hdlcdev_tx_timeout - called by network layer when transmit timeout is detected 1616 * @dev: pointer to network device structure 1617 * @txqueue: unused 1618 */ 1619 static void hdlcdev_tx_timeout(struct net_device *dev, unsigned int txqueue) 1620 { 1621 struct slgt_info *info = dev_to_port(dev); 1622 unsigned long flags; 1623 1624 DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name)); 1625 1626 dev->stats.tx_errors++; 1627 dev->stats.tx_aborted_errors++; 1628 1629 spin_lock_irqsave(&info->lock,flags); 1630 tx_stop(info); 1631 spin_unlock_irqrestore(&info->lock,flags); 1632 1633 netif_wake_queue(dev); 1634 } 1635 1636 /** 1637 * hdlcdev_tx_done - called by device driver when transmit completes 1638 * @info: pointer to device instance information 1639 * 1640 * Reenable network layer transmit if stopped. 1641 */ 1642 static void hdlcdev_tx_done(struct slgt_info *info) 1643 { 1644 if (netif_queue_stopped(info->netdev)) 1645 netif_wake_queue(info->netdev); 1646 } 1647 1648 /** 1649 * hdlcdev_rx - called by device driver when frame received 1650 * @info: pointer to device instance information 1651 * @buf: pointer to buffer contianing frame data 1652 * @size: count of data bytes in buf 1653 * 1654 * Pass frame to network layer. 1655 */ 1656 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size) 1657 { 1658 struct sk_buff *skb = dev_alloc_skb(size); 1659 struct net_device *dev = info->netdev; 1660 1661 DBGINFO(("%s hdlcdev_rx\n", dev->name)); 1662 1663 if (skb == NULL) { 1664 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name)); 1665 dev->stats.rx_dropped++; 1666 return; 1667 } 1668 1669 skb_put_data(skb, buf, size); 1670 1671 skb->protocol = hdlc_type_trans(skb, dev); 1672 1673 dev->stats.rx_packets++; 1674 dev->stats.rx_bytes += size; 1675 1676 netif_rx(skb); 1677 } 1678 1679 static const struct net_device_ops hdlcdev_ops = { 1680 .ndo_open = hdlcdev_open, 1681 .ndo_stop = hdlcdev_close, 1682 .ndo_start_xmit = hdlc_start_xmit, 1683 .ndo_siocwandev = hdlcdev_ioctl, 1684 .ndo_tx_timeout = hdlcdev_tx_timeout, 1685 }; 1686 1687 /** 1688 * hdlcdev_init - called by device driver when adding device instance 1689 * @info: pointer to device instance information 1690 * 1691 * Do generic HDLC initialization. 1692 * 1693 * Return: 0 if success, otherwise error code 1694 */ 1695 static int hdlcdev_init(struct slgt_info *info) 1696 { 1697 int rc; 1698 struct net_device *dev; 1699 hdlc_device *hdlc; 1700 1701 /* allocate and initialize network and HDLC layer objects */ 1702 1703 dev = alloc_hdlcdev(info); 1704 if (!dev) { 1705 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name); 1706 return -ENOMEM; 1707 } 1708 1709 /* for network layer reporting purposes only */ 1710 dev->mem_start = info->phys_reg_addr; 1711 dev->mem_end = info->phys_reg_addr + SLGT_REG_SIZE - 1; 1712 dev->irq = info->irq_level; 1713 1714 /* network layer callbacks and settings */ 1715 dev->netdev_ops = &hdlcdev_ops; 1716 dev->watchdog_timeo = 10 * HZ; 1717 dev->tx_queue_len = 50; 1718 1719 /* generic HDLC layer callbacks and settings */ 1720 hdlc = dev_to_hdlc(dev); 1721 hdlc->attach = hdlcdev_attach; 1722 hdlc->xmit = hdlcdev_xmit; 1723 1724 /* register objects with HDLC layer */ 1725 rc = register_hdlc_device(dev); 1726 if (rc) { 1727 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__); 1728 free_netdev(dev); 1729 return rc; 1730 } 1731 1732 info->netdev = dev; 1733 return 0; 1734 } 1735 1736 /** 1737 * hdlcdev_exit - called by device driver when removing device instance 1738 * @info: pointer to device instance information 1739 * 1740 * Do generic HDLC cleanup. 1741 */ 1742 static void hdlcdev_exit(struct slgt_info *info) 1743 { 1744 if (!info->netdev) 1745 return; 1746 unregister_hdlc_device(info->netdev); 1747 free_netdev(info->netdev); 1748 info->netdev = NULL; 1749 } 1750 1751 #endif /* ifdef CONFIG_HDLC */ 1752 1753 /* 1754 * get async data from rx DMA buffers 1755 */ 1756 static void rx_async(struct slgt_info *info) 1757 { 1758 struct mgsl_icount *icount = &info->icount; 1759 unsigned int start, end; 1760 unsigned char *p; 1761 unsigned char status; 1762 struct slgt_desc *bufs = info->rbufs; 1763 int i, count; 1764 int chars = 0; 1765 int stat; 1766 unsigned char ch; 1767 1768 start = end = info->rbuf_current; 1769 1770 while(desc_complete(bufs[end])) { 1771 count = desc_count(bufs[end]) - info->rbuf_index; 1772 p = bufs[end].buf + info->rbuf_index; 1773 1774 DBGISR(("%s rx_async count=%d\n", info->device_name, count)); 1775 DBGDATA(info, p, count, "rx"); 1776 1777 for(i=0 ; i < count; i+=2, p+=2) { 1778 ch = *p; 1779 icount->rx++; 1780 1781 stat = 0; 1782 1783 status = *(p + 1) & (BIT1 + BIT0); 1784 if (status) { 1785 if (status & BIT1) 1786 icount->parity++; 1787 else if (status & BIT0) 1788 icount->frame++; 1789 /* discard char if tty control flags say so */ 1790 if (status & info->ignore_status_mask) 1791 continue; 1792 if (status & BIT1) 1793 stat = TTY_PARITY; 1794 else if (status & BIT0) 1795 stat = TTY_FRAME; 1796 } 1797 tty_insert_flip_char(&info->port, ch, stat); 1798 chars++; 1799 } 1800 1801 if (i < count) { 1802 /* receive buffer not completed */ 1803 info->rbuf_index += i; 1804 mod_timer(&info->rx_timer, jiffies + 1); 1805 break; 1806 } 1807 1808 info->rbuf_index = 0; 1809 free_rbufs(info, end, end); 1810 1811 if (++end == info->rbuf_count) 1812 end = 0; 1813 1814 /* if entire list searched then no frame available */ 1815 if (end == start) 1816 break; 1817 } 1818 1819 if (chars) 1820 tty_flip_buffer_push(&info->port); 1821 } 1822 1823 /* 1824 * return next bottom half action to perform 1825 */ 1826 static int bh_action(struct slgt_info *info) 1827 { 1828 unsigned long flags; 1829 int rc; 1830 1831 spin_lock_irqsave(&info->lock,flags); 1832 1833 if (info->pending_bh & BH_RECEIVE) { 1834 info->pending_bh &= ~BH_RECEIVE; 1835 rc = BH_RECEIVE; 1836 } else if (info->pending_bh & BH_TRANSMIT) { 1837 info->pending_bh &= ~BH_TRANSMIT; 1838 rc = BH_TRANSMIT; 1839 } else if (info->pending_bh & BH_STATUS) { 1840 info->pending_bh &= ~BH_STATUS; 1841 rc = BH_STATUS; 1842 } else { 1843 /* Mark BH routine as complete */ 1844 info->bh_running = false; 1845 info->bh_requested = false; 1846 rc = 0; 1847 } 1848 1849 spin_unlock_irqrestore(&info->lock,flags); 1850 1851 return rc; 1852 } 1853 1854 /* 1855 * perform bottom half processing 1856 */ 1857 static void bh_handler(struct work_struct *work) 1858 { 1859 struct slgt_info *info = container_of(work, struct slgt_info, task); 1860 int action; 1861 1862 info->bh_running = true; 1863 1864 while((action = bh_action(info))) { 1865 switch (action) { 1866 case BH_RECEIVE: 1867 DBGBH(("%s bh receive\n", info->device_name)); 1868 switch(info->params.mode) { 1869 case MGSL_MODE_ASYNC: 1870 rx_async(info); 1871 break; 1872 case MGSL_MODE_HDLC: 1873 while(rx_get_frame(info)); 1874 break; 1875 case MGSL_MODE_RAW: 1876 case MGSL_MODE_MONOSYNC: 1877 case MGSL_MODE_BISYNC: 1878 case MGSL_MODE_XSYNC: 1879 while(rx_get_buf(info)); 1880 break; 1881 } 1882 /* restart receiver if rx DMA buffers exhausted */ 1883 if (info->rx_restart) 1884 rx_start(info); 1885 break; 1886 case BH_TRANSMIT: 1887 bh_transmit(info); 1888 break; 1889 case BH_STATUS: 1890 DBGBH(("%s bh status\n", info->device_name)); 1891 info->ri_chkcount = 0; 1892 info->dsr_chkcount = 0; 1893 info->dcd_chkcount = 0; 1894 info->cts_chkcount = 0; 1895 break; 1896 default: 1897 DBGBH(("%s unknown action\n", info->device_name)); 1898 break; 1899 } 1900 } 1901 DBGBH(("%s bh_handler exit\n", info->device_name)); 1902 } 1903 1904 static void bh_transmit(struct slgt_info *info) 1905 { 1906 struct tty_struct *tty = info->port.tty; 1907 1908 DBGBH(("%s bh_transmit\n", info->device_name)); 1909 if (tty) 1910 tty_wakeup(tty); 1911 } 1912 1913 static void dsr_change(struct slgt_info *info, unsigned short status) 1914 { 1915 if (status & BIT3) { 1916 info->signals |= SerialSignal_DSR; 1917 info->input_signal_events.dsr_up++; 1918 } else { 1919 info->signals &= ~SerialSignal_DSR; 1920 info->input_signal_events.dsr_down++; 1921 } 1922 DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals)); 1923 if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) { 1924 slgt_irq_off(info, IRQ_DSR); 1925 return; 1926 } 1927 info->icount.dsr++; 1928 wake_up_interruptible(&info->status_event_wait_q); 1929 wake_up_interruptible(&info->event_wait_q); 1930 info->pending_bh |= BH_STATUS; 1931 } 1932 1933 static void cts_change(struct slgt_info *info, unsigned short status) 1934 { 1935 if (status & BIT2) { 1936 info->signals |= SerialSignal_CTS; 1937 info->input_signal_events.cts_up++; 1938 } else { 1939 info->signals &= ~SerialSignal_CTS; 1940 info->input_signal_events.cts_down++; 1941 } 1942 DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals)); 1943 if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) { 1944 slgt_irq_off(info, IRQ_CTS); 1945 return; 1946 } 1947 info->icount.cts++; 1948 wake_up_interruptible(&info->status_event_wait_q); 1949 wake_up_interruptible(&info->event_wait_q); 1950 info->pending_bh |= BH_STATUS; 1951 1952 if (tty_port_cts_enabled(&info->port)) { 1953 if (info->port.tty) { 1954 if (info->port.tty->hw_stopped) { 1955 if (info->signals & SerialSignal_CTS) { 1956 info->port.tty->hw_stopped = 0; 1957 info->pending_bh |= BH_TRANSMIT; 1958 return; 1959 } 1960 } else { 1961 if (!(info->signals & SerialSignal_CTS)) 1962 info->port.tty->hw_stopped = 1; 1963 } 1964 } 1965 } 1966 } 1967 1968 static void dcd_change(struct slgt_info *info, unsigned short status) 1969 { 1970 if (status & BIT1) { 1971 info->signals |= SerialSignal_DCD; 1972 info->input_signal_events.dcd_up++; 1973 } else { 1974 info->signals &= ~SerialSignal_DCD; 1975 info->input_signal_events.dcd_down++; 1976 } 1977 DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals)); 1978 if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) { 1979 slgt_irq_off(info, IRQ_DCD); 1980 return; 1981 } 1982 info->icount.dcd++; 1983 #if SYNCLINK_GENERIC_HDLC 1984 if (info->netcount) { 1985 if (info->signals & SerialSignal_DCD) 1986 netif_carrier_on(info->netdev); 1987 else 1988 netif_carrier_off(info->netdev); 1989 } 1990 #endif 1991 wake_up_interruptible(&info->status_event_wait_q); 1992 wake_up_interruptible(&info->event_wait_q); 1993 info->pending_bh |= BH_STATUS; 1994 1995 if (tty_port_check_carrier(&info->port)) { 1996 if (info->signals & SerialSignal_DCD) 1997 wake_up_interruptible(&info->port.open_wait); 1998 else { 1999 if (info->port.tty) 2000 tty_hangup(info->port.tty); 2001 } 2002 } 2003 } 2004 2005 static void ri_change(struct slgt_info *info, unsigned short status) 2006 { 2007 if (status & BIT0) { 2008 info->signals |= SerialSignal_RI; 2009 info->input_signal_events.ri_up++; 2010 } else { 2011 info->signals &= ~SerialSignal_RI; 2012 info->input_signal_events.ri_down++; 2013 } 2014 DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals)); 2015 if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) { 2016 slgt_irq_off(info, IRQ_RI); 2017 return; 2018 } 2019 info->icount.rng++; 2020 wake_up_interruptible(&info->status_event_wait_q); 2021 wake_up_interruptible(&info->event_wait_q); 2022 info->pending_bh |= BH_STATUS; 2023 } 2024 2025 static void isr_rxdata(struct slgt_info *info) 2026 { 2027 unsigned int count = info->rbuf_fill_count; 2028 unsigned int i = info->rbuf_fill_index; 2029 unsigned short reg; 2030 2031 while (rd_reg16(info, SSR) & IRQ_RXDATA) { 2032 reg = rd_reg16(info, RDR); 2033 DBGISR(("isr_rxdata %s RDR=%04X\n", info->device_name, reg)); 2034 if (desc_complete(info->rbufs[i])) { 2035 /* all buffers full */ 2036 rx_stop(info); 2037 info->rx_restart = true; 2038 continue; 2039 } 2040 info->rbufs[i].buf[count++] = (unsigned char)reg; 2041 /* async mode saves status byte to buffer for each data byte */ 2042 if (info->params.mode == MGSL_MODE_ASYNC) 2043 info->rbufs[i].buf[count++] = (unsigned char)(reg >> 8); 2044 if (count == info->rbuf_fill_level || (reg & BIT10)) { 2045 /* buffer full or end of frame */ 2046 set_desc_count(info->rbufs[i], count); 2047 set_desc_status(info->rbufs[i], BIT15 | (reg >> 8)); 2048 info->rbuf_fill_count = count = 0; 2049 if (++i == info->rbuf_count) 2050 i = 0; 2051 info->pending_bh |= BH_RECEIVE; 2052 } 2053 } 2054 2055 info->rbuf_fill_index = i; 2056 info->rbuf_fill_count = count; 2057 } 2058 2059 static void isr_serial(struct slgt_info *info) 2060 { 2061 unsigned short status = rd_reg16(info, SSR); 2062 2063 DBGISR(("%s isr_serial status=%04X\n", info->device_name, status)); 2064 2065 wr_reg16(info, SSR, status); /* clear pending */ 2066 2067 info->irq_occurred = true; 2068 2069 if (info->params.mode == MGSL_MODE_ASYNC) { 2070 if (status & IRQ_TXIDLE) { 2071 if (info->tx_active) 2072 isr_txeom(info, status); 2073 } 2074 if (info->rx_pio && (status & IRQ_RXDATA)) 2075 isr_rxdata(info); 2076 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) { 2077 info->icount.brk++; 2078 /* process break detection if tty control allows */ 2079 if (info->port.tty) { 2080 if (!(status & info->ignore_status_mask)) { 2081 if (info->read_status_mask & MASK_BREAK) { 2082 tty_insert_flip_char(&info->port, 0, TTY_BREAK); 2083 if (info->port.flags & ASYNC_SAK) 2084 do_SAK(info->port.tty); 2085 } 2086 } 2087 } 2088 } 2089 } else { 2090 if (status & (IRQ_TXIDLE + IRQ_TXUNDER)) 2091 isr_txeom(info, status); 2092 if (info->rx_pio && (status & IRQ_RXDATA)) 2093 isr_rxdata(info); 2094 if (status & IRQ_RXIDLE) { 2095 if (status & RXIDLE) 2096 info->icount.rxidle++; 2097 else 2098 info->icount.exithunt++; 2099 wake_up_interruptible(&info->event_wait_q); 2100 } 2101 2102 if (status & IRQ_RXOVER) 2103 rx_start(info); 2104 } 2105 2106 if (status & IRQ_DSR) 2107 dsr_change(info, status); 2108 if (status & IRQ_CTS) 2109 cts_change(info, status); 2110 if (status & IRQ_DCD) 2111 dcd_change(info, status); 2112 if (status & IRQ_RI) 2113 ri_change(info, status); 2114 } 2115 2116 static void isr_rdma(struct slgt_info *info) 2117 { 2118 unsigned int status = rd_reg32(info, RDCSR); 2119 2120 DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status)); 2121 2122 /* RDCSR (rx DMA control/status) 2123 * 2124 * 31..07 reserved 2125 * 06 save status byte to DMA buffer 2126 * 05 error 2127 * 04 eol (end of list) 2128 * 03 eob (end of buffer) 2129 * 02 IRQ enable 2130 * 01 reset 2131 * 00 enable 2132 */ 2133 wr_reg32(info, RDCSR, status); /* clear pending */ 2134 2135 if (status & (BIT5 + BIT4)) { 2136 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name)); 2137 info->rx_restart = true; 2138 } 2139 info->pending_bh |= BH_RECEIVE; 2140 } 2141 2142 static void isr_tdma(struct slgt_info *info) 2143 { 2144 unsigned int status = rd_reg32(info, TDCSR); 2145 2146 DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status)); 2147 2148 /* TDCSR (tx DMA control/status) 2149 * 2150 * 31..06 reserved 2151 * 05 error 2152 * 04 eol (end of list) 2153 * 03 eob (end of buffer) 2154 * 02 IRQ enable 2155 * 01 reset 2156 * 00 enable 2157 */ 2158 wr_reg32(info, TDCSR, status); /* clear pending */ 2159 2160 if (status & (BIT5 + BIT4 + BIT3)) { 2161 // another transmit buffer has completed 2162 // run bottom half to get more send data from user 2163 info->pending_bh |= BH_TRANSMIT; 2164 } 2165 } 2166 2167 /* 2168 * return true if there are unsent tx DMA buffers, otherwise false 2169 * 2170 * if there are unsent buffers then info->tbuf_start 2171 * is set to index of first unsent buffer 2172 */ 2173 static bool unsent_tbufs(struct slgt_info *info) 2174 { 2175 unsigned int i = info->tbuf_current; 2176 bool rc = false; 2177 2178 /* 2179 * search backwards from last loaded buffer (precedes tbuf_current) 2180 * for first unsent buffer (desc_count > 0) 2181 */ 2182 2183 do { 2184 if (i) 2185 i--; 2186 else 2187 i = info->tbuf_count - 1; 2188 if (!desc_count(info->tbufs[i])) 2189 break; 2190 info->tbuf_start = i; 2191 rc = true; 2192 } while (i != info->tbuf_current); 2193 2194 return rc; 2195 } 2196 2197 static void isr_txeom(struct slgt_info *info, unsigned short status) 2198 { 2199 DBGISR(("%s txeom status=%04x\n", info->device_name, status)); 2200 2201 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER); 2202 tdma_reset(info); 2203 if (status & IRQ_TXUNDER) { 2204 unsigned short val = rd_reg16(info, TCR); 2205 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */ 2206 wr_reg16(info, TCR, val); /* clear reset bit */ 2207 } 2208 2209 if (info->tx_active) { 2210 if (info->params.mode != MGSL_MODE_ASYNC) { 2211 if (status & IRQ_TXUNDER) 2212 info->icount.txunder++; 2213 else if (status & IRQ_TXIDLE) 2214 info->icount.txok++; 2215 } 2216 2217 if (unsent_tbufs(info)) { 2218 tx_start(info); 2219 update_tx_timer(info); 2220 return; 2221 } 2222 info->tx_active = false; 2223 2224 del_timer(&info->tx_timer); 2225 2226 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) { 2227 info->signals &= ~SerialSignal_RTS; 2228 info->drop_rts_on_tx_done = false; 2229 set_gtsignals(info); 2230 } 2231 2232 #if SYNCLINK_GENERIC_HDLC 2233 if (info->netcount) 2234 hdlcdev_tx_done(info); 2235 else 2236 #endif 2237 { 2238 if (info->port.tty && (info->port.tty->flow.stopped || info->port.tty->hw_stopped)) { 2239 tx_stop(info); 2240 return; 2241 } 2242 info->pending_bh |= BH_TRANSMIT; 2243 } 2244 } 2245 } 2246 2247 static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state) 2248 { 2249 struct cond_wait *w, *prev; 2250 2251 /* wake processes waiting for specific transitions */ 2252 for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) { 2253 if (w->data & changed) { 2254 w->data = state; 2255 wake_up_interruptible(&w->q); 2256 if (prev != NULL) 2257 prev->next = w->next; 2258 else 2259 info->gpio_wait_q = w->next; 2260 } else 2261 prev = w; 2262 } 2263 } 2264 2265 /* interrupt service routine 2266 * 2267 * irq interrupt number 2268 * dev_id device ID supplied during interrupt registration 2269 */ 2270 static irqreturn_t slgt_interrupt(int dummy, void *dev_id) 2271 { 2272 struct slgt_info *info = dev_id; 2273 unsigned int gsr; 2274 unsigned int i; 2275 2276 DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level)); 2277 2278 while((gsr = rd_reg32(info, GSR) & 0xffffff00)) { 2279 DBGISR(("%s gsr=%08x\n", info->device_name, gsr)); 2280 info->irq_occurred = true; 2281 for(i=0; i < info->port_count ; i++) { 2282 if (info->port_array[i] == NULL) 2283 continue; 2284 spin_lock(&info->port_array[i]->lock); 2285 if (gsr & (BIT8 << i)) 2286 isr_serial(info->port_array[i]); 2287 if (gsr & (BIT16 << (i*2))) 2288 isr_rdma(info->port_array[i]); 2289 if (gsr & (BIT17 << (i*2))) 2290 isr_tdma(info->port_array[i]); 2291 spin_unlock(&info->port_array[i]->lock); 2292 } 2293 } 2294 2295 if (info->gpio_present) { 2296 unsigned int state; 2297 unsigned int changed; 2298 spin_lock(&info->lock); 2299 while ((changed = rd_reg32(info, IOSR)) != 0) { 2300 DBGISR(("%s iosr=%08x\n", info->device_name, changed)); 2301 /* read latched state of GPIO signals */ 2302 state = rd_reg32(info, IOVR); 2303 /* clear pending GPIO interrupt bits */ 2304 wr_reg32(info, IOSR, changed); 2305 for (i=0 ; i < info->port_count ; i++) { 2306 if (info->port_array[i] != NULL) 2307 isr_gpio(info->port_array[i], changed, state); 2308 } 2309 } 2310 spin_unlock(&info->lock); 2311 } 2312 2313 for(i=0; i < info->port_count ; i++) { 2314 struct slgt_info *port = info->port_array[i]; 2315 if (port == NULL) 2316 continue; 2317 spin_lock(&port->lock); 2318 if ((port->port.count || port->netcount) && 2319 port->pending_bh && !port->bh_running && 2320 !port->bh_requested) { 2321 DBGISR(("%s bh queued\n", port->device_name)); 2322 schedule_work(&port->task); 2323 port->bh_requested = true; 2324 } 2325 spin_unlock(&port->lock); 2326 } 2327 2328 DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level)); 2329 return IRQ_HANDLED; 2330 } 2331 2332 static int startup(struct slgt_info *info) 2333 { 2334 DBGINFO(("%s startup\n", info->device_name)); 2335 2336 if (tty_port_initialized(&info->port)) 2337 return 0; 2338 2339 if (!info->tx_buf) { 2340 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL); 2341 if (!info->tx_buf) { 2342 DBGERR(("%s can't allocate tx buffer\n", info->device_name)); 2343 return -ENOMEM; 2344 } 2345 } 2346 2347 info->pending_bh = 0; 2348 2349 memset(&info->icount, 0, sizeof(info->icount)); 2350 2351 /* program hardware for current parameters */ 2352 change_params(info); 2353 2354 if (info->port.tty) 2355 clear_bit(TTY_IO_ERROR, &info->port.tty->flags); 2356 2357 tty_port_set_initialized(&info->port, true); 2358 2359 return 0; 2360 } 2361 2362 /* 2363 * called by close() and hangup() to shutdown hardware 2364 */ 2365 static void shutdown(struct slgt_info *info) 2366 { 2367 unsigned long flags; 2368 2369 if (!tty_port_initialized(&info->port)) 2370 return; 2371 2372 DBGINFO(("%s shutdown\n", info->device_name)); 2373 2374 /* clear status wait queue because status changes */ 2375 /* can't happen after shutting down the hardware */ 2376 wake_up_interruptible(&info->status_event_wait_q); 2377 wake_up_interruptible(&info->event_wait_q); 2378 2379 del_timer_sync(&info->tx_timer); 2380 del_timer_sync(&info->rx_timer); 2381 2382 kfree(info->tx_buf); 2383 info->tx_buf = NULL; 2384 2385 spin_lock_irqsave(&info->lock,flags); 2386 2387 tx_stop(info); 2388 rx_stop(info); 2389 2390 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER); 2391 2392 if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) { 2393 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR); 2394 set_gtsignals(info); 2395 } 2396 2397 flush_cond_wait(&info->gpio_wait_q); 2398 2399 spin_unlock_irqrestore(&info->lock,flags); 2400 2401 if (info->port.tty) 2402 set_bit(TTY_IO_ERROR, &info->port.tty->flags); 2403 2404 tty_port_set_initialized(&info->port, false); 2405 } 2406 2407 static void program_hw(struct slgt_info *info) 2408 { 2409 unsigned long flags; 2410 2411 spin_lock_irqsave(&info->lock,flags); 2412 2413 rx_stop(info); 2414 tx_stop(info); 2415 2416 if (info->params.mode != MGSL_MODE_ASYNC || 2417 info->netcount) 2418 sync_mode(info); 2419 else 2420 async_mode(info); 2421 2422 set_gtsignals(info); 2423 2424 info->dcd_chkcount = 0; 2425 info->cts_chkcount = 0; 2426 info->ri_chkcount = 0; 2427 info->dsr_chkcount = 0; 2428 2429 slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI); 2430 get_gtsignals(info); 2431 2432 if (info->netcount || 2433 (info->port.tty && info->port.tty->termios.c_cflag & CREAD)) 2434 rx_start(info); 2435 2436 spin_unlock_irqrestore(&info->lock,flags); 2437 } 2438 2439 /* 2440 * reconfigure adapter based on new parameters 2441 */ 2442 static void change_params(struct slgt_info *info) 2443 { 2444 unsigned cflag; 2445 int bits_per_char; 2446 2447 if (!info->port.tty) 2448 return; 2449 DBGINFO(("%s change_params\n", info->device_name)); 2450 2451 cflag = info->port.tty->termios.c_cflag; 2452 2453 /* if B0 rate (hangup) specified then negate RTS and DTR */ 2454 /* otherwise assert RTS and DTR */ 2455 if (cflag & CBAUD) 2456 info->signals |= SerialSignal_RTS | SerialSignal_DTR; 2457 else 2458 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR); 2459 2460 /* byte size and parity */ 2461 2462 info->params.data_bits = tty_get_char_size(cflag); 2463 info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1; 2464 2465 if (cflag & PARENB) 2466 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN; 2467 else 2468 info->params.parity = ASYNC_PARITY_NONE; 2469 2470 /* calculate number of jiffies to transmit a full 2471 * FIFO (32 bytes) at specified data rate 2472 */ 2473 bits_per_char = info->params.data_bits + 2474 info->params.stop_bits + 1; 2475 2476 info->params.data_rate = tty_get_baud_rate(info->port.tty); 2477 2478 if (info->params.data_rate) { 2479 info->timeout = (32*HZ*bits_per_char) / 2480 info->params.data_rate; 2481 } 2482 info->timeout += HZ/50; /* Add .02 seconds of slop */ 2483 2484 tty_port_set_cts_flow(&info->port, cflag & CRTSCTS); 2485 tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL); 2486 2487 /* process tty input control flags */ 2488 2489 info->read_status_mask = IRQ_RXOVER; 2490 if (I_INPCK(info->port.tty)) 2491 info->read_status_mask |= MASK_PARITY | MASK_FRAMING; 2492 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty)) 2493 info->read_status_mask |= MASK_BREAK; 2494 if (I_IGNPAR(info->port.tty)) 2495 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING; 2496 if (I_IGNBRK(info->port.tty)) { 2497 info->ignore_status_mask |= MASK_BREAK; 2498 /* If ignoring parity and break indicators, ignore 2499 * overruns too. (For real raw support). 2500 */ 2501 if (I_IGNPAR(info->port.tty)) 2502 info->ignore_status_mask |= MASK_OVERRUN; 2503 } 2504 2505 program_hw(info); 2506 } 2507 2508 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount) 2509 { 2510 DBGINFO(("%s get_stats\n", info->device_name)); 2511 if (!user_icount) { 2512 memset(&info->icount, 0, sizeof(info->icount)); 2513 } else { 2514 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount))) 2515 return -EFAULT; 2516 } 2517 return 0; 2518 } 2519 2520 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params) 2521 { 2522 DBGINFO(("%s get_params\n", info->device_name)); 2523 if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS))) 2524 return -EFAULT; 2525 return 0; 2526 } 2527 2528 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params) 2529 { 2530 unsigned long flags; 2531 MGSL_PARAMS tmp_params; 2532 2533 DBGINFO(("%s set_params\n", info->device_name)); 2534 if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS))) 2535 return -EFAULT; 2536 2537 spin_lock_irqsave(&info->lock, flags); 2538 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) 2539 info->base_clock = tmp_params.clock_speed; 2540 else 2541 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS)); 2542 spin_unlock_irqrestore(&info->lock, flags); 2543 2544 program_hw(info); 2545 2546 return 0; 2547 } 2548 2549 static int get_txidle(struct slgt_info *info, int __user *idle_mode) 2550 { 2551 DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode)); 2552 if (put_user(info->idle_mode, idle_mode)) 2553 return -EFAULT; 2554 return 0; 2555 } 2556 2557 static int set_txidle(struct slgt_info *info, int idle_mode) 2558 { 2559 unsigned long flags; 2560 DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode)); 2561 spin_lock_irqsave(&info->lock,flags); 2562 info->idle_mode = idle_mode; 2563 if (info->params.mode != MGSL_MODE_ASYNC) 2564 tx_set_idle(info); 2565 spin_unlock_irqrestore(&info->lock,flags); 2566 return 0; 2567 } 2568 2569 static int tx_enable(struct slgt_info *info, int enable) 2570 { 2571 unsigned long flags; 2572 DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable)); 2573 spin_lock_irqsave(&info->lock,flags); 2574 if (enable) { 2575 if (!info->tx_enabled) 2576 tx_start(info); 2577 } else { 2578 if (info->tx_enabled) 2579 tx_stop(info); 2580 } 2581 spin_unlock_irqrestore(&info->lock,flags); 2582 return 0; 2583 } 2584 2585 /* 2586 * abort transmit HDLC frame 2587 */ 2588 static int tx_abort(struct slgt_info *info) 2589 { 2590 unsigned long flags; 2591 DBGINFO(("%s tx_abort\n", info->device_name)); 2592 spin_lock_irqsave(&info->lock,flags); 2593 tdma_reset(info); 2594 spin_unlock_irqrestore(&info->lock,flags); 2595 return 0; 2596 } 2597 2598 static int rx_enable(struct slgt_info *info, int enable) 2599 { 2600 unsigned long flags; 2601 unsigned int rbuf_fill_level; 2602 DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable)); 2603 spin_lock_irqsave(&info->lock,flags); 2604 /* 2605 * enable[31..16] = receive DMA buffer fill level 2606 * 0 = noop (leave fill level unchanged) 2607 * fill level must be multiple of 4 and <= buffer size 2608 */ 2609 rbuf_fill_level = ((unsigned int)enable) >> 16; 2610 if (rbuf_fill_level) { 2611 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) { 2612 spin_unlock_irqrestore(&info->lock, flags); 2613 return -EINVAL; 2614 } 2615 info->rbuf_fill_level = rbuf_fill_level; 2616 if (rbuf_fill_level < 128) 2617 info->rx_pio = 1; /* PIO mode */ 2618 else 2619 info->rx_pio = 0; /* DMA mode */ 2620 rx_stop(info); /* restart receiver to use new fill level */ 2621 } 2622 2623 /* 2624 * enable[1..0] = receiver enable command 2625 * 0 = disable 2626 * 1 = enable 2627 * 2 = enable or force hunt mode if already enabled 2628 */ 2629 enable &= 3; 2630 if (enable) { 2631 if (!info->rx_enabled) 2632 rx_start(info); 2633 else if (enable == 2) { 2634 /* force hunt mode (write 1 to RCR[3]) */ 2635 wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3); 2636 } 2637 } else { 2638 if (info->rx_enabled) 2639 rx_stop(info); 2640 } 2641 spin_unlock_irqrestore(&info->lock,flags); 2642 return 0; 2643 } 2644 2645 /* 2646 * wait for specified event to occur 2647 */ 2648 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr) 2649 { 2650 unsigned long flags; 2651 int s; 2652 int rc=0; 2653 struct mgsl_icount cprev, cnow; 2654 int events; 2655 int mask; 2656 struct _input_signal_events oldsigs, newsigs; 2657 DECLARE_WAITQUEUE(wait, current); 2658 2659 if (get_user(mask, mask_ptr)) 2660 return -EFAULT; 2661 2662 DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask)); 2663 2664 spin_lock_irqsave(&info->lock,flags); 2665 2666 /* return immediately if state matches requested events */ 2667 get_gtsignals(info); 2668 s = info->signals; 2669 2670 events = mask & 2671 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) + 2672 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) + 2673 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) + 2674 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) ); 2675 if (events) { 2676 spin_unlock_irqrestore(&info->lock,flags); 2677 goto exit; 2678 } 2679 2680 /* save current irq counts */ 2681 cprev = info->icount; 2682 oldsigs = info->input_signal_events; 2683 2684 /* enable hunt and idle irqs if needed */ 2685 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) { 2686 unsigned short val = rd_reg16(info, SCR); 2687 if (!(val & IRQ_RXIDLE)) 2688 wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE)); 2689 } 2690 2691 set_current_state(TASK_INTERRUPTIBLE); 2692 add_wait_queue(&info->event_wait_q, &wait); 2693 2694 spin_unlock_irqrestore(&info->lock,flags); 2695 2696 for(;;) { 2697 schedule(); 2698 if (signal_pending(current)) { 2699 rc = -ERESTARTSYS; 2700 break; 2701 } 2702 2703 /* get current irq counts */ 2704 spin_lock_irqsave(&info->lock,flags); 2705 cnow = info->icount; 2706 newsigs = info->input_signal_events; 2707 set_current_state(TASK_INTERRUPTIBLE); 2708 spin_unlock_irqrestore(&info->lock,flags); 2709 2710 /* if no change, wait aborted for some reason */ 2711 if (newsigs.dsr_up == oldsigs.dsr_up && 2712 newsigs.dsr_down == oldsigs.dsr_down && 2713 newsigs.dcd_up == oldsigs.dcd_up && 2714 newsigs.dcd_down == oldsigs.dcd_down && 2715 newsigs.cts_up == oldsigs.cts_up && 2716 newsigs.cts_down == oldsigs.cts_down && 2717 newsigs.ri_up == oldsigs.ri_up && 2718 newsigs.ri_down == oldsigs.ri_down && 2719 cnow.exithunt == cprev.exithunt && 2720 cnow.rxidle == cprev.rxidle) { 2721 rc = -EIO; 2722 break; 2723 } 2724 2725 events = mask & 2726 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) + 2727 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) + 2728 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) + 2729 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) + 2730 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) + 2731 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) + 2732 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) + 2733 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) + 2734 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) + 2735 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) ); 2736 if (events) 2737 break; 2738 2739 cprev = cnow; 2740 oldsigs = newsigs; 2741 } 2742 2743 remove_wait_queue(&info->event_wait_q, &wait); 2744 set_current_state(TASK_RUNNING); 2745 2746 2747 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) { 2748 spin_lock_irqsave(&info->lock,flags); 2749 if (!waitqueue_active(&info->event_wait_q)) { 2750 /* disable enable exit hunt mode/idle rcvd IRQs */ 2751 wr_reg16(info, SCR, 2752 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE)); 2753 } 2754 spin_unlock_irqrestore(&info->lock,flags); 2755 } 2756 exit: 2757 if (rc == 0) 2758 rc = put_user(events, mask_ptr); 2759 return rc; 2760 } 2761 2762 static int get_interface(struct slgt_info *info, int __user *if_mode) 2763 { 2764 DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode)); 2765 if (put_user(info->if_mode, if_mode)) 2766 return -EFAULT; 2767 return 0; 2768 } 2769 2770 static int set_interface(struct slgt_info *info, int if_mode) 2771 { 2772 unsigned long flags; 2773 unsigned short val; 2774 2775 DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode)); 2776 spin_lock_irqsave(&info->lock,flags); 2777 info->if_mode = if_mode; 2778 2779 msc_set_vcr(info); 2780 2781 /* TCR (tx control) 07 1=RTS driver control */ 2782 val = rd_reg16(info, TCR); 2783 if (info->if_mode & MGSL_INTERFACE_RTS_EN) 2784 val |= BIT7; 2785 else 2786 val &= ~BIT7; 2787 wr_reg16(info, TCR, val); 2788 2789 spin_unlock_irqrestore(&info->lock,flags); 2790 return 0; 2791 } 2792 2793 static int get_xsync(struct slgt_info *info, int __user *xsync) 2794 { 2795 DBGINFO(("%s get_xsync=%x\n", info->device_name, info->xsync)); 2796 if (put_user(info->xsync, xsync)) 2797 return -EFAULT; 2798 return 0; 2799 } 2800 2801 /* 2802 * set extended sync pattern (1 to 4 bytes) for extended sync mode 2803 * 2804 * sync pattern is contained in least significant bytes of value 2805 * most significant byte of sync pattern is oldest (1st sent/detected) 2806 */ 2807 static int set_xsync(struct slgt_info *info, int xsync) 2808 { 2809 unsigned long flags; 2810 2811 DBGINFO(("%s set_xsync=%x)\n", info->device_name, xsync)); 2812 spin_lock_irqsave(&info->lock, flags); 2813 info->xsync = xsync; 2814 wr_reg32(info, XSR, xsync); 2815 spin_unlock_irqrestore(&info->lock, flags); 2816 return 0; 2817 } 2818 2819 static int get_xctrl(struct slgt_info *info, int __user *xctrl) 2820 { 2821 DBGINFO(("%s get_xctrl=%x\n", info->device_name, info->xctrl)); 2822 if (put_user(info->xctrl, xctrl)) 2823 return -EFAULT; 2824 return 0; 2825 } 2826 2827 /* 2828 * set extended control options 2829 * 2830 * xctrl[31:19] reserved, must be zero 2831 * xctrl[18:17] extended sync pattern length in bytes 2832 * 00 = 1 byte in xsr[7:0] 2833 * 01 = 2 bytes in xsr[15:0] 2834 * 10 = 3 bytes in xsr[23:0] 2835 * 11 = 4 bytes in xsr[31:0] 2836 * xctrl[16] 1 = enable terminal count, 0=disabled 2837 * xctrl[15:0] receive terminal count for fixed length packets 2838 * value is count minus one (0 = 1 byte packet) 2839 * when terminal count is reached, receiver 2840 * automatically returns to hunt mode and receive 2841 * FIFO contents are flushed to DMA buffers with 2842 * end of frame (EOF) status 2843 */ 2844 static int set_xctrl(struct slgt_info *info, int xctrl) 2845 { 2846 unsigned long flags; 2847 2848 DBGINFO(("%s set_xctrl=%x)\n", info->device_name, xctrl)); 2849 spin_lock_irqsave(&info->lock, flags); 2850 info->xctrl = xctrl; 2851 wr_reg32(info, XCR, xctrl); 2852 spin_unlock_irqrestore(&info->lock, flags); 2853 return 0; 2854 } 2855 2856 /* 2857 * set general purpose IO pin state and direction 2858 * 2859 * user_gpio fields: 2860 * state each bit indicates a pin state 2861 * smask set bit indicates pin state to set 2862 * dir each bit indicates a pin direction (0=input, 1=output) 2863 * dmask set bit indicates pin direction to set 2864 */ 2865 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio) 2866 { 2867 unsigned long flags; 2868 struct gpio_desc gpio; 2869 __u32 data; 2870 2871 if (!info->gpio_present) 2872 return -EINVAL; 2873 if (copy_from_user(&gpio, user_gpio, sizeof(gpio))) 2874 return -EFAULT; 2875 DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n", 2876 info->device_name, gpio.state, gpio.smask, 2877 gpio.dir, gpio.dmask)); 2878 2879 spin_lock_irqsave(&info->port_array[0]->lock, flags); 2880 if (gpio.dmask) { 2881 data = rd_reg32(info, IODR); 2882 data |= gpio.dmask & gpio.dir; 2883 data &= ~(gpio.dmask & ~gpio.dir); 2884 wr_reg32(info, IODR, data); 2885 } 2886 if (gpio.smask) { 2887 data = rd_reg32(info, IOVR); 2888 data |= gpio.smask & gpio.state; 2889 data &= ~(gpio.smask & ~gpio.state); 2890 wr_reg32(info, IOVR, data); 2891 } 2892 spin_unlock_irqrestore(&info->port_array[0]->lock, flags); 2893 2894 return 0; 2895 } 2896 2897 /* 2898 * get general purpose IO pin state and direction 2899 */ 2900 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio) 2901 { 2902 struct gpio_desc gpio; 2903 if (!info->gpio_present) 2904 return -EINVAL; 2905 gpio.state = rd_reg32(info, IOVR); 2906 gpio.smask = 0xffffffff; 2907 gpio.dir = rd_reg32(info, IODR); 2908 gpio.dmask = 0xffffffff; 2909 if (copy_to_user(user_gpio, &gpio, sizeof(gpio))) 2910 return -EFAULT; 2911 DBGINFO(("%s get_gpio state=%08x dir=%08x\n", 2912 info->device_name, gpio.state, gpio.dir)); 2913 return 0; 2914 } 2915 2916 /* 2917 * conditional wait facility 2918 */ 2919 static void init_cond_wait(struct cond_wait *w, unsigned int data) 2920 { 2921 init_waitqueue_head(&w->q); 2922 init_waitqueue_entry(&w->wait, current); 2923 w->data = data; 2924 } 2925 2926 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w) 2927 { 2928 set_current_state(TASK_INTERRUPTIBLE); 2929 add_wait_queue(&w->q, &w->wait); 2930 w->next = *head; 2931 *head = w; 2932 } 2933 2934 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw) 2935 { 2936 struct cond_wait *w, *prev; 2937 remove_wait_queue(&cw->q, &cw->wait); 2938 set_current_state(TASK_RUNNING); 2939 for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) { 2940 if (w == cw) { 2941 if (prev != NULL) 2942 prev->next = w->next; 2943 else 2944 *head = w->next; 2945 break; 2946 } 2947 } 2948 } 2949 2950 static void flush_cond_wait(struct cond_wait **head) 2951 { 2952 while (*head != NULL) { 2953 wake_up_interruptible(&(*head)->q); 2954 *head = (*head)->next; 2955 } 2956 } 2957 2958 /* 2959 * wait for general purpose I/O pin(s) to enter specified state 2960 * 2961 * user_gpio fields: 2962 * state - bit indicates target pin state 2963 * smask - set bit indicates watched pin 2964 * 2965 * The wait ends when at least one watched pin enters the specified 2966 * state. When 0 (no error) is returned, user_gpio->state is set to the 2967 * state of all GPIO pins when the wait ends. 2968 * 2969 * Note: Each pin may be a dedicated input, dedicated output, or 2970 * configurable input/output. The number and configuration of pins 2971 * varies with the specific adapter model. Only input pins (dedicated 2972 * or configured) can be monitored with this function. 2973 */ 2974 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio) 2975 { 2976 unsigned long flags; 2977 int rc = 0; 2978 struct gpio_desc gpio; 2979 struct cond_wait wait; 2980 u32 state; 2981 2982 if (!info->gpio_present) 2983 return -EINVAL; 2984 if (copy_from_user(&gpio, user_gpio, sizeof(gpio))) 2985 return -EFAULT; 2986 DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n", 2987 info->device_name, gpio.state, gpio.smask)); 2988 /* ignore output pins identified by set IODR bit */ 2989 if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0) 2990 return -EINVAL; 2991 init_cond_wait(&wait, gpio.smask); 2992 2993 spin_lock_irqsave(&info->port_array[0]->lock, flags); 2994 /* enable interrupts for watched pins */ 2995 wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask); 2996 /* get current pin states */ 2997 state = rd_reg32(info, IOVR); 2998 2999 if (gpio.smask & ~(state ^ gpio.state)) { 3000 /* already in target state */ 3001 gpio.state = state; 3002 } else { 3003 /* wait for target state */ 3004 add_cond_wait(&info->gpio_wait_q, &wait); 3005 spin_unlock_irqrestore(&info->port_array[0]->lock, flags); 3006 schedule(); 3007 if (signal_pending(current)) 3008 rc = -ERESTARTSYS; 3009 else 3010 gpio.state = wait.data; 3011 spin_lock_irqsave(&info->port_array[0]->lock, flags); 3012 remove_cond_wait(&info->gpio_wait_q, &wait); 3013 } 3014 3015 /* disable all GPIO interrupts if no waiting processes */ 3016 if (info->gpio_wait_q == NULL) 3017 wr_reg32(info, IOER, 0); 3018 spin_unlock_irqrestore(&info->port_array[0]->lock, flags); 3019 3020 if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio))) 3021 rc = -EFAULT; 3022 return rc; 3023 } 3024 3025 static int modem_input_wait(struct slgt_info *info,int arg) 3026 { 3027 unsigned long flags; 3028 int rc; 3029 struct mgsl_icount cprev, cnow; 3030 DECLARE_WAITQUEUE(wait, current); 3031 3032 /* save current irq counts */ 3033 spin_lock_irqsave(&info->lock,flags); 3034 cprev = info->icount; 3035 add_wait_queue(&info->status_event_wait_q, &wait); 3036 set_current_state(TASK_INTERRUPTIBLE); 3037 spin_unlock_irqrestore(&info->lock,flags); 3038 3039 for(;;) { 3040 schedule(); 3041 if (signal_pending(current)) { 3042 rc = -ERESTARTSYS; 3043 break; 3044 } 3045 3046 /* get new irq counts */ 3047 spin_lock_irqsave(&info->lock,flags); 3048 cnow = info->icount; 3049 set_current_state(TASK_INTERRUPTIBLE); 3050 spin_unlock_irqrestore(&info->lock,flags); 3051 3052 /* if no change, wait aborted for some reason */ 3053 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 3054 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) { 3055 rc = -EIO; 3056 break; 3057 } 3058 3059 /* check for change in caller specified modem input */ 3060 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) || 3061 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) || 3062 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) || 3063 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) { 3064 rc = 0; 3065 break; 3066 } 3067 3068 cprev = cnow; 3069 } 3070 remove_wait_queue(&info->status_event_wait_q, &wait); 3071 set_current_state(TASK_RUNNING); 3072 return rc; 3073 } 3074 3075 /* 3076 * return state of serial control and status signals 3077 */ 3078 static int tiocmget(struct tty_struct *tty) 3079 { 3080 struct slgt_info *info = tty->driver_data; 3081 unsigned int result; 3082 unsigned long flags; 3083 3084 spin_lock_irqsave(&info->lock,flags); 3085 get_gtsignals(info); 3086 spin_unlock_irqrestore(&info->lock,flags); 3087 3088 result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) + 3089 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) + 3090 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) + 3091 ((info->signals & SerialSignal_RI) ? TIOCM_RNG:0) + 3092 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) + 3093 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0); 3094 3095 DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result)); 3096 return result; 3097 } 3098 3099 /* 3100 * set modem control signals (DTR/RTS) 3101 * 3102 * cmd signal command: TIOCMBIS = set bit TIOCMBIC = clear bit 3103 * TIOCMSET = set/clear signal values 3104 * value bit mask for command 3105 */ 3106 static int tiocmset(struct tty_struct *tty, 3107 unsigned int set, unsigned int clear) 3108 { 3109 struct slgt_info *info = tty->driver_data; 3110 unsigned long flags; 3111 3112 DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear)); 3113 3114 if (set & TIOCM_RTS) 3115 info->signals |= SerialSignal_RTS; 3116 if (set & TIOCM_DTR) 3117 info->signals |= SerialSignal_DTR; 3118 if (clear & TIOCM_RTS) 3119 info->signals &= ~SerialSignal_RTS; 3120 if (clear & TIOCM_DTR) 3121 info->signals &= ~SerialSignal_DTR; 3122 3123 spin_lock_irqsave(&info->lock,flags); 3124 set_gtsignals(info); 3125 spin_unlock_irqrestore(&info->lock,flags); 3126 return 0; 3127 } 3128 3129 static bool carrier_raised(struct tty_port *port) 3130 { 3131 unsigned long flags; 3132 struct slgt_info *info = container_of(port, struct slgt_info, port); 3133 3134 spin_lock_irqsave(&info->lock,flags); 3135 get_gtsignals(info); 3136 spin_unlock_irqrestore(&info->lock,flags); 3137 3138 return info->signals & SerialSignal_DCD; 3139 } 3140 3141 static void dtr_rts(struct tty_port *port, bool active) 3142 { 3143 unsigned long flags; 3144 struct slgt_info *info = container_of(port, struct slgt_info, port); 3145 3146 spin_lock_irqsave(&info->lock,flags); 3147 if (active) 3148 info->signals |= SerialSignal_RTS | SerialSignal_DTR; 3149 else 3150 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR); 3151 set_gtsignals(info); 3152 spin_unlock_irqrestore(&info->lock,flags); 3153 } 3154 3155 3156 /* 3157 * block current process until the device is ready to open 3158 */ 3159 static int block_til_ready(struct tty_struct *tty, struct file *filp, 3160 struct slgt_info *info) 3161 { 3162 DECLARE_WAITQUEUE(wait, current); 3163 int retval; 3164 bool do_clocal = false; 3165 unsigned long flags; 3166 bool cd; 3167 struct tty_port *port = &info->port; 3168 3169 DBGINFO(("%s block_til_ready\n", tty->driver->name)); 3170 3171 if (filp->f_flags & O_NONBLOCK || tty_io_error(tty)) { 3172 /* nonblock mode is set or port is not enabled */ 3173 tty_port_set_active(port, true); 3174 return 0; 3175 } 3176 3177 if (C_CLOCAL(tty)) 3178 do_clocal = true; 3179 3180 /* Wait for carrier detect and the line to become 3181 * free (i.e., not in use by the callout). While we are in 3182 * this loop, port->count is dropped by one, so that 3183 * close() knows when to free things. We restore it upon 3184 * exit, either normal or abnormal. 3185 */ 3186 3187 retval = 0; 3188 add_wait_queue(&port->open_wait, &wait); 3189 3190 spin_lock_irqsave(&info->lock, flags); 3191 port->count--; 3192 spin_unlock_irqrestore(&info->lock, flags); 3193 port->blocked_open++; 3194 3195 while (1) { 3196 if (C_BAUD(tty) && tty_port_initialized(port)) 3197 tty_port_raise_dtr_rts(port); 3198 3199 set_current_state(TASK_INTERRUPTIBLE); 3200 3201 if (tty_hung_up_p(filp) || !tty_port_initialized(port)) { 3202 retval = (port->flags & ASYNC_HUP_NOTIFY) ? 3203 -EAGAIN : -ERESTARTSYS; 3204 break; 3205 } 3206 3207 cd = tty_port_carrier_raised(port); 3208 if (do_clocal || cd) 3209 break; 3210 3211 if (signal_pending(current)) { 3212 retval = -ERESTARTSYS; 3213 break; 3214 } 3215 3216 DBGINFO(("%s block_til_ready wait\n", tty->driver->name)); 3217 tty_unlock(tty); 3218 schedule(); 3219 tty_lock(tty); 3220 } 3221 3222 set_current_state(TASK_RUNNING); 3223 remove_wait_queue(&port->open_wait, &wait); 3224 3225 if (!tty_hung_up_p(filp)) 3226 port->count++; 3227 port->blocked_open--; 3228 3229 if (!retval) 3230 tty_port_set_active(port, true); 3231 3232 DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval)); 3233 return retval; 3234 } 3235 3236 /* 3237 * allocate buffers used for calling line discipline receive_buf 3238 * directly in synchronous mode 3239 * note: add 5 bytes to max frame size to allow appending 3240 * 32-bit CRC and status byte when configured to do so 3241 */ 3242 static int alloc_tmp_rbuf(struct slgt_info *info) 3243 { 3244 info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL); 3245 if (info->tmp_rbuf == NULL) 3246 return -ENOMEM; 3247 /* unused flag buffer to satisfy receive_buf calling interface */ 3248 info->flag_buf = kzalloc(info->max_frame_size + 5, GFP_KERNEL); 3249 if (!info->flag_buf) { 3250 kfree(info->tmp_rbuf); 3251 info->tmp_rbuf = NULL; 3252 return -ENOMEM; 3253 } 3254 return 0; 3255 } 3256 3257 static void free_tmp_rbuf(struct slgt_info *info) 3258 { 3259 kfree(info->tmp_rbuf); 3260 info->tmp_rbuf = NULL; 3261 kfree(info->flag_buf); 3262 info->flag_buf = NULL; 3263 } 3264 3265 /* 3266 * allocate DMA descriptor lists. 3267 */ 3268 static int alloc_desc(struct slgt_info *info) 3269 { 3270 unsigned int i; 3271 unsigned int pbufs; 3272 3273 /* allocate memory to hold descriptor lists */ 3274 info->bufs = dma_alloc_coherent(&info->pdev->dev, DESC_LIST_SIZE, 3275 &info->bufs_dma_addr, GFP_KERNEL); 3276 if (info->bufs == NULL) 3277 return -ENOMEM; 3278 3279 info->rbufs = (struct slgt_desc*)info->bufs; 3280 info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count; 3281 3282 pbufs = (unsigned int)info->bufs_dma_addr; 3283 3284 /* 3285 * Build circular lists of descriptors 3286 */ 3287 3288 for (i=0; i < info->rbuf_count; i++) { 3289 /* physical address of this descriptor */ 3290 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc)); 3291 3292 /* physical address of next descriptor */ 3293 if (i == info->rbuf_count - 1) 3294 info->rbufs[i].next = cpu_to_le32(pbufs); 3295 else 3296 info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc))); 3297 set_desc_count(info->rbufs[i], DMABUFSIZE); 3298 } 3299 3300 for (i=0; i < info->tbuf_count; i++) { 3301 /* physical address of this descriptor */ 3302 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc)); 3303 3304 /* physical address of next descriptor */ 3305 if (i == info->tbuf_count - 1) 3306 info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc)); 3307 else 3308 info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc))); 3309 } 3310 3311 return 0; 3312 } 3313 3314 static void free_desc(struct slgt_info *info) 3315 { 3316 if (info->bufs != NULL) { 3317 dma_free_coherent(&info->pdev->dev, DESC_LIST_SIZE, 3318 info->bufs, info->bufs_dma_addr); 3319 info->bufs = NULL; 3320 info->rbufs = NULL; 3321 info->tbufs = NULL; 3322 } 3323 } 3324 3325 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count) 3326 { 3327 int i; 3328 for (i=0; i < count; i++) { 3329 bufs[i].buf = dma_alloc_coherent(&info->pdev->dev, DMABUFSIZE, 3330 &bufs[i].buf_dma_addr, GFP_KERNEL); 3331 if (!bufs[i].buf) 3332 return -ENOMEM; 3333 bufs[i].pbuf = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr); 3334 } 3335 return 0; 3336 } 3337 3338 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count) 3339 { 3340 int i; 3341 for (i=0; i < count; i++) { 3342 if (bufs[i].buf == NULL) 3343 continue; 3344 dma_free_coherent(&info->pdev->dev, DMABUFSIZE, bufs[i].buf, 3345 bufs[i].buf_dma_addr); 3346 bufs[i].buf = NULL; 3347 } 3348 } 3349 3350 static int alloc_dma_bufs(struct slgt_info *info) 3351 { 3352 info->rbuf_count = 32; 3353 info->tbuf_count = 32; 3354 3355 if (alloc_desc(info) < 0 || 3356 alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 || 3357 alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 || 3358 alloc_tmp_rbuf(info) < 0) { 3359 DBGERR(("%s DMA buffer alloc fail\n", info->device_name)); 3360 return -ENOMEM; 3361 } 3362 reset_rbufs(info); 3363 return 0; 3364 } 3365 3366 static void free_dma_bufs(struct slgt_info *info) 3367 { 3368 if (info->bufs) { 3369 free_bufs(info, info->rbufs, info->rbuf_count); 3370 free_bufs(info, info->tbufs, info->tbuf_count); 3371 free_desc(info); 3372 } 3373 free_tmp_rbuf(info); 3374 } 3375 3376 static int claim_resources(struct slgt_info *info) 3377 { 3378 if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) { 3379 DBGERR(("%s reg addr conflict, addr=%08X\n", 3380 info->device_name, info->phys_reg_addr)); 3381 info->init_error = DiagStatus_AddressConflict; 3382 goto errout; 3383 } 3384 else 3385 info->reg_addr_requested = true; 3386 3387 info->reg_addr = ioremap(info->phys_reg_addr, SLGT_REG_SIZE); 3388 if (!info->reg_addr) { 3389 DBGERR(("%s can't map device registers, addr=%08X\n", 3390 info->device_name, info->phys_reg_addr)); 3391 info->init_error = DiagStatus_CantAssignPciResources; 3392 goto errout; 3393 } 3394 return 0; 3395 3396 errout: 3397 release_resources(info); 3398 return -ENODEV; 3399 } 3400 3401 static void release_resources(struct slgt_info *info) 3402 { 3403 if (info->irq_requested) { 3404 free_irq(info->irq_level, info); 3405 info->irq_requested = false; 3406 } 3407 3408 if (info->reg_addr_requested) { 3409 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE); 3410 info->reg_addr_requested = false; 3411 } 3412 3413 if (info->reg_addr) { 3414 iounmap(info->reg_addr); 3415 info->reg_addr = NULL; 3416 } 3417 } 3418 3419 /* Add the specified device instance data structure to the 3420 * global linked list of devices and increment the device count. 3421 */ 3422 static void add_device(struct slgt_info *info) 3423 { 3424 char *devstr; 3425 3426 info->next_device = NULL; 3427 info->line = slgt_device_count; 3428 sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line); 3429 3430 if (info->line < MAX_DEVICES) { 3431 if (maxframe[info->line]) 3432 info->max_frame_size = maxframe[info->line]; 3433 } 3434 3435 slgt_device_count++; 3436 3437 if (!slgt_device_list) 3438 slgt_device_list = info; 3439 else { 3440 struct slgt_info *current_dev = slgt_device_list; 3441 while(current_dev->next_device) 3442 current_dev = current_dev->next_device; 3443 current_dev->next_device = info; 3444 } 3445 3446 if (info->max_frame_size < 4096) 3447 info->max_frame_size = 4096; 3448 else if (info->max_frame_size > 65535) 3449 info->max_frame_size = 65535; 3450 3451 switch(info->pdev->device) { 3452 case SYNCLINK_GT_DEVICE_ID: 3453 devstr = "GT"; 3454 break; 3455 case SYNCLINK_GT2_DEVICE_ID: 3456 devstr = "GT2"; 3457 break; 3458 case SYNCLINK_GT4_DEVICE_ID: 3459 devstr = "GT4"; 3460 break; 3461 case SYNCLINK_AC_DEVICE_ID: 3462 devstr = "AC"; 3463 info->params.mode = MGSL_MODE_ASYNC; 3464 break; 3465 default: 3466 devstr = "(unknown model)"; 3467 } 3468 printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n", 3469 devstr, info->device_name, info->phys_reg_addr, 3470 info->irq_level, info->max_frame_size); 3471 3472 #if SYNCLINK_GENERIC_HDLC 3473 hdlcdev_init(info); 3474 #endif 3475 } 3476 3477 static const struct tty_port_operations slgt_port_ops = { 3478 .carrier_raised = carrier_raised, 3479 .dtr_rts = dtr_rts, 3480 }; 3481 3482 /* 3483 * allocate device instance structure, return NULL on failure 3484 */ 3485 static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev) 3486 { 3487 struct slgt_info *info; 3488 3489 info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL); 3490 3491 if (!info) { 3492 DBGERR(("%s device alloc failed adapter=%d port=%d\n", 3493 driver_name, adapter_num, port_num)); 3494 } else { 3495 tty_port_init(&info->port); 3496 info->port.ops = &slgt_port_ops; 3497 INIT_WORK(&info->task, bh_handler); 3498 info->max_frame_size = 4096; 3499 info->base_clock = 14745600; 3500 info->rbuf_fill_level = DMABUFSIZE; 3501 init_waitqueue_head(&info->status_event_wait_q); 3502 init_waitqueue_head(&info->event_wait_q); 3503 spin_lock_init(&info->netlock); 3504 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS)); 3505 info->idle_mode = HDLC_TXIDLE_FLAGS; 3506 info->adapter_num = adapter_num; 3507 info->port_num = port_num; 3508 3509 timer_setup(&info->tx_timer, tx_timeout, 0); 3510 timer_setup(&info->rx_timer, rx_timeout, 0); 3511 3512 /* Copy configuration info to device instance data */ 3513 info->pdev = pdev; 3514 info->irq_level = pdev->irq; 3515 info->phys_reg_addr = pci_resource_start(pdev,0); 3516 3517 info->bus_type = MGSL_BUS_TYPE_PCI; 3518 info->irq_flags = IRQF_SHARED; 3519 3520 info->init_error = -1; /* assume error, set to 0 on successful init */ 3521 } 3522 3523 return info; 3524 } 3525 3526 static void device_init(int adapter_num, struct pci_dev *pdev) 3527 { 3528 struct slgt_info *port_array[SLGT_MAX_PORTS]; 3529 int i; 3530 int port_count = 1; 3531 3532 if (pdev->device == SYNCLINK_GT2_DEVICE_ID) 3533 port_count = 2; 3534 else if (pdev->device == SYNCLINK_GT4_DEVICE_ID) 3535 port_count = 4; 3536 3537 /* allocate device instances for all ports */ 3538 for (i=0; i < port_count; ++i) { 3539 port_array[i] = alloc_dev(adapter_num, i, pdev); 3540 if (port_array[i] == NULL) { 3541 for (--i; i >= 0; --i) { 3542 tty_port_destroy(&port_array[i]->port); 3543 kfree(port_array[i]); 3544 } 3545 return; 3546 } 3547 } 3548 3549 /* give copy of port_array to all ports and add to device list */ 3550 for (i=0; i < port_count; ++i) { 3551 memcpy(port_array[i]->port_array, port_array, sizeof(port_array)); 3552 add_device(port_array[i]); 3553 port_array[i]->port_count = port_count; 3554 spin_lock_init(&port_array[i]->lock); 3555 } 3556 3557 /* Allocate and claim adapter resources */ 3558 if (!claim_resources(port_array[0])) { 3559 3560 alloc_dma_bufs(port_array[0]); 3561 3562 /* copy resource information from first port to others */ 3563 for (i = 1; i < port_count; ++i) { 3564 port_array[i]->irq_level = port_array[0]->irq_level; 3565 port_array[i]->reg_addr = port_array[0]->reg_addr; 3566 alloc_dma_bufs(port_array[i]); 3567 } 3568 3569 if (request_irq(port_array[0]->irq_level, 3570 slgt_interrupt, 3571 port_array[0]->irq_flags, 3572 port_array[0]->device_name, 3573 port_array[0]) < 0) { 3574 DBGERR(("%s request_irq failed IRQ=%d\n", 3575 port_array[0]->device_name, 3576 port_array[0]->irq_level)); 3577 } else { 3578 port_array[0]->irq_requested = true; 3579 adapter_test(port_array[0]); 3580 for (i=1 ; i < port_count ; i++) { 3581 port_array[i]->init_error = port_array[0]->init_error; 3582 port_array[i]->gpio_present = port_array[0]->gpio_present; 3583 } 3584 } 3585 } 3586 3587 for (i = 0; i < port_count; ++i) { 3588 struct slgt_info *info = port_array[i]; 3589 tty_port_register_device(&info->port, serial_driver, info->line, 3590 &info->pdev->dev); 3591 } 3592 } 3593 3594 static int init_one(struct pci_dev *dev, 3595 const struct pci_device_id *ent) 3596 { 3597 if (pci_enable_device(dev)) { 3598 printk("error enabling pci device %p\n", dev); 3599 return -EIO; 3600 } 3601 pci_set_master(dev); 3602 device_init(slgt_device_count, dev); 3603 return 0; 3604 } 3605 3606 static void remove_one(struct pci_dev *dev) 3607 { 3608 } 3609 3610 static const struct tty_operations ops = { 3611 .open = open, 3612 .close = close, 3613 .write = write, 3614 .put_char = put_char, 3615 .flush_chars = flush_chars, 3616 .write_room = write_room, 3617 .chars_in_buffer = chars_in_buffer, 3618 .flush_buffer = flush_buffer, 3619 .ioctl = ioctl, 3620 .compat_ioctl = slgt_compat_ioctl, 3621 .throttle = throttle, 3622 .unthrottle = unthrottle, 3623 .send_xchar = send_xchar, 3624 .break_ctl = set_break, 3625 .wait_until_sent = wait_until_sent, 3626 .set_termios = set_termios, 3627 .stop = tx_hold, 3628 .start = tx_release, 3629 .hangup = hangup, 3630 .tiocmget = tiocmget, 3631 .tiocmset = tiocmset, 3632 .get_icount = get_icount, 3633 .proc_show = synclink_gt_proc_show, 3634 }; 3635 3636 static void slgt_cleanup(void) 3637 { 3638 struct slgt_info *info; 3639 struct slgt_info *tmp; 3640 3641 printk(KERN_INFO "unload %s\n", driver_name); 3642 3643 if (serial_driver) { 3644 for (info=slgt_device_list ; info != NULL ; info=info->next_device) 3645 tty_unregister_device(serial_driver, info->line); 3646 tty_unregister_driver(serial_driver); 3647 tty_driver_kref_put(serial_driver); 3648 } 3649 3650 /* reset devices */ 3651 info = slgt_device_list; 3652 while(info) { 3653 reset_port(info); 3654 info = info->next_device; 3655 } 3656 3657 /* release devices */ 3658 info = slgt_device_list; 3659 while(info) { 3660 #if SYNCLINK_GENERIC_HDLC 3661 hdlcdev_exit(info); 3662 #endif 3663 free_dma_bufs(info); 3664 free_tmp_rbuf(info); 3665 if (info->port_num == 0) 3666 release_resources(info); 3667 tmp = info; 3668 info = info->next_device; 3669 tty_port_destroy(&tmp->port); 3670 kfree(tmp); 3671 } 3672 3673 if (pci_registered) 3674 pci_unregister_driver(&pci_driver); 3675 } 3676 3677 /* 3678 * Driver initialization entry point. 3679 */ 3680 static int __init slgt_init(void) 3681 { 3682 int rc; 3683 3684 printk(KERN_INFO "%s\n", driver_name); 3685 3686 serial_driver = tty_alloc_driver(MAX_DEVICES, TTY_DRIVER_REAL_RAW | 3687 TTY_DRIVER_DYNAMIC_DEV); 3688 if (IS_ERR(serial_driver)) { 3689 printk("%s can't allocate tty driver\n", driver_name); 3690 return PTR_ERR(serial_driver); 3691 } 3692 3693 /* Initialize the tty_driver structure */ 3694 3695 serial_driver->driver_name = slgt_driver_name; 3696 serial_driver->name = tty_dev_prefix; 3697 serial_driver->major = ttymajor; 3698 serial_driver->minor_start = 64; 3699 serial_driver->type = TTY_DRIVER_TYPE_SERIAL; 3700 serial_driver->subtype = SERIAL_TYPE_NORMAL; 3701 serial_driver->init_termios = tty_std_termios; 3702 serial_driver->init_termios.c_cflag = 3703 B9600 | CS8 | CREAD | HUPCL | CLOCAL; 3704 serial_driver->init_termios.c_ispeed = 9600; 3705 serial_driver->init_termios.c_ospeed = 9600; 3706 tty_set_operations(serial_driver, &ops); 3707 if ((rc = tty_register_driver(serial_driver)) < 0) { 3708 DBGERR(("%s can't register serial driver\n", driver_name)); 3709 tty_driver_kref_put(serial_driver); 3710 serial_driver = NULL; 3711 goto error; 3712 } 3713 3714 printk(KERN_INFO "%s, tty major#%d\n", 3715 driver_name, serial_driver->major); 3716 3717 slgt_device_count = 0; 3718 if ((rc = pci_register_driver(&pci_driver)) < 0) { 3719 printk("%s pci_register_driver error=%d\n", driver_name, rc); 3720 goto error; 3721 } 3722 pci_registered = true; 3723 3724 if (!slgt_device_list) 3725 printk("%s no devices found\n",driver_name); 3726 3727 return 0; 3728 3729 error: 3730 slgt_cleanup(); 3731 return rc; 3732 } 3733 3734 static void __exit slgt_exit(void) 3735 { 3736 slgt_cleanup(); 3737 } 3738 3739 module_init(slgt_init); 3740 module_exit(slgt_exit); 3741 3742 /* 3743 * register access routines 3744 */ 3745 3746 #define CALC_REGADDR() \ 3747 unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \ 3748 if (addr >= 0x80) \ 3749 reg_addr += (info->port_num) * 32; \ 3750 else if (addr >= 0x40) \ 3751 reg_addr += (info->port_num) * 16; 3752 3753 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr) 3754 { 3755 CALC_REGADDR(); 3756 return readb((void __iomem *)reg_addr); 3757 } 3758 3759 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value) 3760 { 3761 CALC_REGADDR(); 3762 writeb(value, (void __iomem *)reg_addr); 3763 } 3764 3765 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr) 3766 { 3767 CALC_REGADDR(); 3768 return readw((void __iomem *)reg_addr); 3769 } 3770 3771 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value) 3772 { 3773 CALC_REGADDR(); 3774 writew(value, (void __iomem *)reg_addr); 3775 } 3776 3777 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr) 3778 { 3779 CALC_REGADDR(); 3780 return readl((void __iomem *)reg_addr); 3781 } 3782 3783 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value) 3784 { 3785 CALC_REGADDR(); 3786 writel(value, (void __iomem *)reg_addr); 3787 } 3788 3789 static void rdma_reset(struct slgt_info *info) 3790 { 3791 unsigned int i; 3792 3793 /* set reset bit */ 3794 wr_reg32(info, RDCSR, BIT1); 3795 3796 /* wait for enable bit cleared */ 3797 for(i=0 ; i < 1000 ; i++) 3798 if (!(rd_reg32(info, RDCSR) & BIT0)) 3799 break; 3800 } 3801 3802 static void tdma_reset(struct slgt_info *info) 3803 { 3804 unsigned int i; 3805 3806 /* set reset bit */ 3807 wr_reg32(info, TDCSR, BIT1); 3808 3809 /* wait for enable bit cleared */ 3810 for(i=0 ; i < 1000 ; i++) 3811 if (!(rd_reg32(info, TDCSR) & BIT0)) 3812 break; 3813 } 3814 3815 /* 3816 * enable internal loopback 3817 * TxCLK and RxCLK are generated from BRG 3818 * and TxD is looped back to RxD internally. 3819 */ 3820 static void enable_loopback(struct slgt_info *info) 3821 { 3822 /* SCR (serial control) BIT2=loopback enable */ 3823 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2)); 3824 3825 if (info->params.mode != MGSL_MODE_ASYNC) { 3826 /* CCR (clock control) 3827 * 07..05 tx clock source (010 = BRG) 3828 * 04..02 rx clock source (010 = BRG) 3829 * 01 auxclk enable (0 = disable) 3830 * 00 BRG enable (1 = enable) 3831 * 3832 * 0100 1001 3833 */ 3834 wr_reg8(info, CCR, 0x49); 3835 3836 /* set speed if available, otherwise use default */ 3837 if (info->params.clock_speed) 3838 set_rate(info, info->params.clock_speed); 3839 else 3840 set_rate(info, 3686400); 3841 } 3842 } 3843 3844 /* 3845 * set baud rate generator to specified rate 3846 */ 3847 static void set_rate(struct slgt_info *info, u32 rate) 3848 { 3849 unsigned int div; 3850 unsigned int osc = info->base_clock; 3851 3852 /* div = osc/rate - 1 3853 * 3854 * Round div up if osc/rate is not integer to 3855 * force to next slowest rate. 3856 */ 3857 3858 if (rate) { 3859 div = osc/rate; 3860 if (!(osc % rate) && div) 3861 div--; 3862 wr_reg16(info, BDR, (unsigned short)div); 3863 } 3864 } 3865 3866 static void rx_stop(struct slgt_info *info) 3867 { 3868 unsigned short val; 3869 3870 /* disable and reset receiver */ 3871 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */ 3872 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */ 3873 wr_reg16(info, RCR, val); /* clear reset bit */ 3874 3875 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE); 3876 3877 /* clear pending rx interrupts */ 3878 wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER); 3879 3880 rdma_reset(info); 3881 3882 info->rx_enabled = false; 3883 info->rx_restart = false; 3884 } 3885 3886 static void rx_start(struct slgt_info *info) 3887 { 3888 unsigned short val; 3889 3890 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA); 3891 3892 /* clear pending rx overrun IRQ */ 3893 wr_reg16(info, SSR, IRQ_RXOVER); 3894 3895 /* reset and disable receiver */ 3896 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */ 3897 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */ 3898 wr_reg16(info, RCR, val); /* clear reset bit */ 3899 3900 rdma_reset(info); 3901 reset_rbufs(info); 3902 3903 if (info->rx_pio) { 3904 /* rx request when rx FIFO not empty */ 3905 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) & ~BIT14)); 3906 slgt_irq_on(info, IRQ_RXDATA); 3907 if (info->params.mode == MGSL_MODE_ASYNC) { 3908 /* enable saving of rx status */ 3909 wr_reg32(info, RDCSR, BIT6); 3910 } 3911 } else { 3912 /* rx request when rx FIFO half full */ 3913 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT14)); 3914 /* set 1st descriptor address */ 3915 wr_reg32(info, RDDAR, info->rbufs[0].pdesc); 3916 3917 if (info->params.mode != MGSL_MODE_ASYNC) { 3918 /* enable rx DMA and DMA interrupt */ 3919 wr_reg32(info, RDCSR, (BIT2 + BIT0)); 3920 } else { 3921 /* enable saving of rx status, rx DMA and DMA interrupt */ 3922 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0)); 3923 } 3924 } 3925 3926 slgt_irq_on(info, IRQ_RXOVER); 3927 3928 /* enable receiver */ 3929 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1)); 3930 3931 info->rx_restart = false; 3932 info->rx_enabled = true; 3933 } 3934 3935 static void tx_start(struct slgt_info *info) 3936 { 3937 if (!info->tx_enabled) { 3938 wr_reg16(info, TCR, 3939 (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2)); 3940 info->tx_enabled = true; 3941 } 3942 3943 if (desc_count(info->tbufs[info->tbuf_start])) { 3944 info->drop_rts_on_tx_done = false; 3945 3946 if (info->params.mode != MGSL_MODE_ASYNC) { 3947 if (info->params.flags & HDLC_FLAG_AUTO_RTS) { 3948 get_gtsignals(info); 3949 if (!(info->signals & SerialSignal_RTS)) { 3950 info->signals |= SerialSignal_RTS; 3951 set_gtsignals(info); 3952 info->drop_rts_on_tx_done = true; 3953 } 3954 } 3955 3956 slgt_irq_off(info, IRQ_TXDATA); 3957 slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE); 3958 /* clear tx idle and underrun status bits */ 3959 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER)); 3960 } else { 3961 slgt_irq_off(info, IRQ_TXDATA); 3962 slgt_irq_on(info, IRQ_TXIDLE); 3963 /* clear tx idle status bit */ 3964 wr_reg16(info, SSR, IRQ_TXIDLE); 3965 } 3966 /* set 1st descriptor address and start DMA */ 3967 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc); 3968 wr_reg32(info, TDCSR, BIT2 + BIT0); 3969 info->tx_active = true; 3970 } 3971 } 3972 3973 static void tx_stop(struct slgt_info *info) 3974 { 3975 unsigned short val; 3976 3977 del_timer(&info->tx_timer); 3978 3979 tdma_reset(info); 3980 3981 /* reset and disable transmitter */ 3982 val = rd_reg16(info, TCR) & ~BIT1; /* clear enable bit */ 3983 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */ 3984 3985 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER); 3986 3987 /* clear tx idle and underrun status bit */ 3988 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER)); 3989 3990 reset_tbufs(info); 3991 3992 info->tx_enabled = false; 3993 info->tx_active = false; 3994 } 3995 3996 static void reset_port(struct slgt_info *info) 3997 { 3998 if (!info->reg_addr) 3999 return; 4000 4001 tx_stop(info); 4002 rx_stop(info); 4003 4004 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR); 4005 set_gtsignals(info); 4006 4007 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER); 4008 } 4009 4010 static void reset_adapter(struct slgt_info *info) 4011 { 4012 int i; 4013 for (i=0; i < info->port_count; ++i) { 4014 if (info->port_array[i]) 4015 reset_port(info->port_array[i]); 4016 } 4017 } 4018 4019 static void async_mode(struct slgt_info *info) 4020 { 4021 unsigned short val; 4022 4023 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER); 4024 tx_stop(info); 4025 rx_stop(info); 4026 4027 /* TCR (tx control) 4028 * 4029 * 15..13 mode, 010=async 4030 * 12..10 encoding, 000=NRZ 4031 * 09 parity enable 4032 * 08 1=odd parity, 0=even parity 4033 * 07 1=RTS driver control 4034 * 06 1=break enable 4035 * 05..04 character length 4036 * 00=5 bits 4037 * 01=6 bits 4038 * 10=7 bits 4039 * 11=8 bits 4040 * 03 0=1 stop bit, 1=2 stop bits 4041 * 02 reset 4042 * 01 enable 4043 * 00 auto-CTS enable 4044 */ 4045 val = 0x4000; 4046 4047 if (info->if_mode & MGSL_INTERFACE_RTS_EN) 4048 val |= BIT7; 4049 4050 if (info->params.parity != ASYNC_PARITY_NONE) { 4051 val |= BIT9; 4052 if (info->params.parity == ASYNC_PARITY_ODD) 4053 val |= BIT8; 4054 } 4055 4056 switch (info->params.data_bits) 4057 { 4058 case 6: val |= BIT4; break; 4059 case 7: val |= BIT5; break; 4060 case 8: val |= BIT5 + BIT4; break; 4061 } 4062 4063 if (info->params.stop_bits != 1) 4064 val |= BIT3; 4065 4066 if (info->params.flags & HDLC_FLAG_AUTO_CTS) 4067 val |= BIT0; 4068 4069 wr_reg16(info, TCR, val); 4070 4071 /* RCR (rx control) 4072 * 4073 * 15..13 mode, 010=async 4074 * 12..10 encoding, 000=NRZ 4075 * 09 parity enable 4076 * 08 1=odd parity, 0=even parity 4077 * 07..06 reserved, must be 0 4078 * 05..04 character length 4079 * 00=5 bits 4080 * 01=6 bits 4081 * 10=7 bits 4082 * 11=8 bits 4083 * 03 reserved, must be zero 4084 * 02 reset 4085 * 01 enable 4086 * 00 auto-DCD enable 4087 */ 4088 val = 0x4000; 4089 4090 if (info->params.parity != ASYNC_PARITY_NONE) { 4091 val |= BIT9; 4092 if (info->params.parity == ASYNC_PARITY_ODD) 4093 val |= BIT8; 4094 } 4095 4096 switch (info->params.data_bits) 4097 { 4098 case 6: val |= BIT4; break; 4099 case 7: val |= BIT5; break; 4100 case 8: val |= BIT5 + BIT4; break; 4101 } 4102 4103 if (info->params.flags & HDLC_FLAG_AUTO_DCD) 4104 val |= BIT0; 4105 4106 wr_reg16(info, RCR, val); 4107 4108 /* CCR (clock control) 4109 * 4110 * 07..05 011 = tx clock source is BRG/16 4111 * 04..02 010 = rx clock source is BRG 4112 * 01 0 = auxclk disabled 4113 * 00 1 = BRG enabled 4114 * 4115 * 0110 1001 4116 */ 4117 wr_reg8(info, CCR, 0x69); 4118 4119 msc_set_vcr(info); 4120 4121 /* SCR (serial control) 4122 * 4123 * 15 1=tx req on FIFO half empty 4124 * 14 1=rx req on FIFO half full 4125 * 13 tx data IRQ enable 4126 * 12 tx idle IRQ enable 4127 * 11 rx break on IRQ enable 4128 * 10 rx data IRQ enable 4129 * 09 rx break off IRQ enable 4130 * 08 overrun IRQ enable 4131 * 07 DSR IRQ enable 4132 * 06 CTS IRQ enable 4133 * 05 DCD IRQ enable 4134 * 04 RI IRQ enable 4135 * 03 0=16x sampling, 1=8x sampling 4136 * 02 1=txd->rxd internal loopback enable 4137 * 01 reserved, must be zero 4138 * 00 1=master IRQ enable 4139 */ 4140 val = BIT15 + BIT14 + BIT0; 4141 /* JCR[8] : 1 = x8 async mode feature available */ 4142 if ((rd_reg32(info, JCR) & BIT8) && info->params.data_rate && 4143 ((info->base_clock < (info->params.data_rate * 16)) || 4144 (info->base_clock % (info->params.data_rate * 16)))) { 4145 /* use 8x sampling */ 4146 val |= BIT3; 4147 set_rate(info, info->params.data_rate * 8); 4148 } else { 4149 /* use 16x sampling */ 4150 set_rate(info, info->params.data_rate * 16); 4151 } 4152 wr_reg16(info, SCR, val); 4153 4154 slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER); 4155 4156 if (info->params.loopback) 4157 enable_loopback(info); 4158 } 4159 4160 static void sync_mode(struct slgt_info *info) 4161 { 4162 unsigned short val; 4163 4164 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER); 4165 tx_stop(info); 4166 rx_stop(info); 4167 4168 /* TCR (tx control) 4169 * 4170 * 15..13 mode 4171 * 000=HDLC/SDLC 4172 * 001=raw bit synchronous 4173 * 010=asynchronous/isochronous 4174 * 011=monosync byte synchronous 4175 * 100=bisync byte synchronous 4176 * 101=xsync byte synchronous 4177 * 12..10 encoding 4178 * 09 CRC enable 4179 * 08 CRC32 4180 * 07 1=RTS driver control 4181 * 06 preamble enable 4182 * 05..04 preamble length 4183 * 03 share open/close flag 4184 * 02 reset 4185 * 01 enable 4186 * 00 auto-CTS enable 4187 */ 4188 val = BIT2; 4189 4190 switch(info->params.mode) { 4191 case MGSL_MODE_XSYNC: 4192 val |= BIT15 + BIT13; 4193 break; 4194 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break; 4195 case MGSL_MODE_BISYNC: val |= BIT15; break; 4196 case MGSL_MODE_RAW: val |= BIT13; break; 4197 } 4198 if (info->if_mode & MGSL_INTERFACE_RTS_EN) 4199 val |= BIT7; 4200 4201 switch(info->params.encoding) 4202 { 4203 case HDLC_ENCODING_NRZB: val |= BIT10; break; 4204 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break; 4205 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break; 4206 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break; 4207 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break; 4208 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break; 4209 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break; 4210 } 4211 4212 switch (info->params.crc_type & HDLC_CRC_MASK) 4213 { 4214 case HDLC_CRC_16_CCITT: val |= BIT9; break; 4215 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break; 4216 } 4217 4218 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE) 4219 val |= BIT6; 4220 4221 switch (info->params.preamble_length) 4222 { 4223 case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break; 4224 case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break; 4225 case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break; 4226 } 4227 4228 if (info->params.flags & HDLC_FLAG_AUTO_CTS) 4229 val |= BIT0; 4230 4231 wr_reg16(info, TCR, val); 4232 4233 /* TPR (transmit preamble) */ 4234 4235 switch (info->params.preamble) 4236 { 4237 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break; 4238 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break; 4239 case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break; 4240 case HDLC_PREAMBLE_PATTERN_10: val = 0x55; break; 4241 case HDLC_PREAMBLE_PATTERN_01: val = 0xaa; break; 4242 default: val = 0x7e; break; 4243 } 4244 wr_reg8(info, TPR, (unsigned char)val); 4245 4246 /* RCR (rx control) 4247 * 4248 * 15..13 mode 4249 * 000=HDLC/SDLC 4250 * 001=raw bit synchronous 4251 * 010=asynchronous/isochronous 4252 * 011=monosync byte synchronous 4253 * 100=bisync byte synchronous 4254 * 101=xsync byte synchronous 4255 * 12..10 encoding 4256 * 09 CRC enable 4257 * 08 CRC32 4258 * 07..03 reserved, must be 0 4259 * 02 reset 4260 * 01 enable 4261 * 00 auto-DCD enable 4262 */ 4263 val = 0; 4264 4265 switch(info->params.mode) { 4266 case MGSL_MODE_XSYNC: 4267 val |= BIT15 + BIT13; 4268 break; 4269 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break; 4270 case MGSL_MODE_BISYNC: val |= BIT15; break; 4271 case MGSL_MODE_RAW: val |= BIT13; break; 4272 } 4273 4274 switch(info->params.encoding) 4275 { 4276 case HDLC_ENCODING_NRZB: val |= BIT10; break; 4277 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break; 4278 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break; 4279 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break; 4280 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break; 4281 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break; 4282 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break; 4283 } 4284 4285 switch (info->params.crc_type & HDLC_CRC_MASK) 4286 { 4287 case HDLC_CRC_16_CCITT: val |= BIT9; break; 4288 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break; 4289 } 4290 4291 if (info->params.flags & HDLC_FLAG_AUTO_DCD) 4292 val |= BIT0; 4293 4294 wr_reg16(info, RCR, val); 4295 4296 /* CCR (clock control) 4297 * 4298 * 07..05 tx clock source 4299 * 04..02 rx clock source 4300 * 01 auxclk enable 4301 * 00 BRG enable 4302 */ 4303 val = 0; 4304 4305 if (info->params.flags & HDLC_FLAG_TXC_BRG) 4306 { 4307 // when RxC source is DPLL, BRG generates 16X DPLL 4308 // reference clock, so take TxC from BRG/16 to get 4309 // transmit clock at actual data rate 4310 if (info->params.flags & HDLC_FLAG_RXC_DPLL) 4311 val |= BIT6 + BIT5; /* 011, txclk = BRG/16 */ 4312 else 4313 val |= BIT6; /* 010, txclk = BRG */ 4314 } 4315 else if (info->params.flags & HDLC_FLAG_TXC_DPLL) 4316 val |= BIT7; /* 100, txclk = DPLL Input */ 4317 else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN) 4318 val |= BIT5; /* 001, txclk = RXC Input */ 4319 4320 if (info->params.flags & HDLC_FLAG_RXC_BRG) 4321 val |= BIT3; /* 010, rxclk = BRG */ 4322 else if (info->params.flags & HDLC_FLAG_RXC_DPLL) 4323 val |= BIT4; /* 100, rxclk = DPLL */ 4324 else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN) 4325 val |= BIT2; /* 001, rxclk = TXC Input */ 4326 4327 if (info->params.clock_speed) 4328 val |= BIT1 + BIT0; 4329 4330 wr_reg8(info, CCR, (unsigned char)val); 4331 4332 if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL)) 4333 { 4334 // program DPLL mode 4335 switch(info->params.encoding) 4336 { 4337 case HDLC_ENCODING_BIPHASE_MARK: 4338 case HDLC_ENCODING_BIPHASE_SPACE: 4339 val = BIT7; break; 4340 case HDLC_ENCODING_BIPHASE_LEVEL: 4341 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: 4342 val = BIT7 + BIT6; break; 4343 default: val = BIT6; // NRZ encodings 4344 } 4345 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val)); 4346 4347 // DPLL requires a 16X reference clock from BRG 4348 set_rate(info, info->params.clock_speed * 16); 4349 } 4350 else 4351 set_rate(info, info->params.clock_speed); 4352 4353 tx_set_idle(info); 4354 4355 msc_set_vcr(info); 4356 4357 /* SCR (serial control) 4358 * 4359 * 15 1=tx req on FIFO half empty 4360 * 14 1=rx req on FIFO half full 4361 * 13 tx data IRQ enable 4362 * 12 tx idle IRQ enable 4363 * 11 underrun IRQ enable 4364 * 10 rx data IRQ enable 4365 * 09 rx idle IRQ enable 4366 * 08 overrun IRQ enable 4367 * 07 DSR IRQ enable 4368 * 06 CTS IRQ enable 4369 * 05 DCD IRQ enable 4370 * 04 RI IRQ enable 4371 * 03 reserved, must be zero 4372 * 02 1=txd->rxd internal loopback enable 4373 * 01 reserved, must be zero 4374 * 00 1=master IRQ enable 4375 */ 4376 wr_reg16(info, SCR, BIT15 + BIT14 + BIT0); 4377 4378 if (info->params.loopback) 4379 enable_loopback(info); 4380 } 4381 4382 /* 4383 * set transmit idle mode 4384 */ 4385 static void tx_set_idle(struct slgt_info *info) 4386 { 4387 unsigned char val; 4388 unsigned short tcr; 4389 4390 /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits 4391 * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits 4392 */ 4393 tcr = rd_reg16(info, TCR); 4394 if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) { 4395 /* disable preamble, set idle size to 16 bits */ 4396 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4; 4397 /* MSB of 16 bit idle specified in tx preamble register (TPR) */ 4398 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff)); 4399 } else if (!(tcr & BIT6)) { 4400 /* preamble is disabled, set idle size to 8 bits */ 4401 tcr &= ~(BIT5 + BIT4); 4402 } 4403 wr_reg16(info, TCR, tcr); 4404 4405 if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) { 4406 /* LSB of custom tx idle specified in tx idle register */ 4407 val = (unsigned char)(info->idle_mode & 0xff); 4408 } else { 4409 /* standard 8 bit idle patterns */ 4410 switch(info->idle_mode) 4411 { 4412 case HDLC_TXIDLE_FLAGS: val = 0x7e; break; 4413 case HDLC_TXIDLE_ALT_ZEROS_ONES: 4414 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break; 4415 case HDLC_TXIDLE_ZEROS: 4416 case HDLC_TXIDLE_SPACE: val = 0x00; break; 4417 default: val = 0xff; 4418 } 4419 } 4420 4421 wr_reg8(info, TIR, val); 4422 } 4423 4424 /* 4425 * get state of V24 status (input) signals 4426 */ 4427 static void get_gtsignals(struct slgt_info *info) 4428 { 4429 unsigned short status = rd_reg16(info, SSR); 4430 4431 /* clear all serial signals except RTS and DTR */ 4432 info->signals &= SerialSignal_RTS | SerialSignal_DTR; 4433 4434 if (status & BIT3) 4435 info->signals |= SerialSignal_DSR; 4436 if (status & BIT2) 4437 info->signals |= SerialSignal_CTS; 4438 if (status & BIT1) 4439 info->signals |= SerialSignal_DCD; 4440 if (status & BIT0) 4441 info->signals |= SerialSignal_RI; 4442 } 4443 4444 /* 4445 * set V.24 Control Register based on current configuration 4446 */ 4447 static void msc_set_vcr(struct slgt_info *info) 4448 { 4449 unsigned char val = 0; 4450 4451 /* VCR (V.24 control) 4452 * 4453 * 07..04 serial IF select 4454 * 03 DTR 4455 * 02 RTS 4456 * 01 LL 4457 * 00 RL 4458 */ 4459 4460 switch(info->if_mode & MGSL_INTERFACE_MASK) 4461 { 4462 case MGSL_INTERFACE_RS232: 4463 val |= BIT5; /* 0010 */ 4464 break; 4465 case MGSL_INTERFACE_V35: 4466 val |= BIT7 + BIT6 + BIT5; /* 1110 */ 4467 break; 4468 case MGSL_INTERFACE_RS422: 4469 val |= BIT6; /* 0100 */ 4470 break; 4471 } 4472 4473 if (info->if_mode & MGSL_INTERFACE_MSB_FIRST) 4474 val |= BIT4; 4475 if (info->signals & SerialSignal_DTR) 4476 val |= BIT3; 4477 if (info->signals & SerialSignal_RTS) 4478 val |= BIT2; 4479 if (info->if_mode & MGSL_INTERFACE_LL) 4480 val |= BIT1; 4481 if (info->if_mode & MGSL_INTERFACE_RL) 4482 val |= BIT0; 4483 wr_reg8(info, VCR, val); 4484 } 4485 4486 /* 4487 * set state of V24 control (output) signals 4488 */ 4489 static void set_gtsignals(struct slgt_info *info) 4490 { 4491 unsigned char val = rd_reg8(info, VCR); 4492 if (info->signals & SerialSignal_DTR) 4493 val |= BIT3; 4494 else 4495 val &= ~BIT3; 4496 if (info->signals & SerialSignal_RTS) 4497 val |= BIT2; 4498 else 4499 val &= ~BIT2; 4500 wr_reg8(info, VCR, val); 4501 } 4502 4503 /* 4504 * free range of receive DMA buffers (i to last) 4505 */ 4506 static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last) 4507 { 4508 int done = 0; 4509 4510 while(!done) { 4511 /* reset current buffer for reuse */ 4512 info->rbufs[i].status = 0; 4513 set_desc_count(info->rbufs[i], info->rbuf_fill_level); 4514 if (i == last) 4515 done = 1; 4516 if (++i == info->rbuf_count) 4517 i = 0; 4518 } 4519 info->rbuf_current = i; 4520 } 4521 4522 /* 4523 * mark all receive DMA buffers as free 4524 */ 4525 static void reset_rbufs(struct slgt_info *info) 4526 { 4527 free_rbufs(info, 0, info->rbuf_count - 1); 4528 info->rbuf_fill_index = 0; 4529 info->rbuf_fill_count = 0; 4530 } 4531 4532 /* 4533 * pass receive HDLC frame to upper layer 4534 * 4535 * return true if frame available, otherwise false 4536 */ 4537 static bool rx_get_frame(struct slgt_info *info) 4538 { 4539 unsigned int start, end; 4540 unsigned short status; 4541 unsigned int framesize = 0; 4542 unsigned long flags; 4543 struct tty_struct *tty = info->port.tty; 4544 unsigned char addr_field = 0xff; 4545 unsigned int crc_size = 0; 4546 4547 switch (info->params.crc_type & HDLC_CRC_MASK) { 4548 case HDLC_CRC_16_CCITT: crc_size = 2; break; 4549 case HDLC_CRC_32_CCITT: crc_size = 4; break; 4550 } 4551 4552 check_again: 4553 4554 framesize = 0; 4555 addr_field = 0xff; 4556 start = end = info->rbuf_current; 4557 4558 for (;;) { 4559 if (!desc_complete(info->rbufs[end])) 4560 goto cleanup; 4561 4562 if (framesize == 0 && info->params.addr_filter != 0xff) 4563 addr_field = info->rbufs[end].buf[0]; 4564 4565 framesize += desc_count(info->rbufs[end]); 4566 4567 if (desc_eof(info->rbufs[end])) 4568 break; 4569 4570 if (++end == info->rbuf_count) 4571 end = 0; 4572 4573 if (end == info->rbuf_current) { 4574 if (info->rx_enabled){ 4575 spin_lock_irqsave(&info->lock,flags); 4576 rx_start(info); 4577 spin_unlock_irqrestore(&info->lock,flags); 4578 } 4579 goto cleanup; 4580 } 4581 } 4582 4583 /* status 4584 * 4585 * 15 buffer complete 4586 * 14..06 reserved 4587 * 05..04 residue 4588 * 02 eof (end of frame) 4589 * 01 CRC error 4590 * 00 abort 4591 */ 4592 status = desc_status(info->rbufs[end]); 4593 4594 /* ignore CRC bit if not using CRC (bit is undefined) */ 4595 if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE) 4596 status &= ~BIT1; 4597 4598 if (framesize == 0 || 4599 (addr_field != 0xff && addr_field != info->params.addr_filter)) { 4600 free_rbufs(info, start, end); 4601 goto check_again; 4602 } 4603 4604 if (framesize < (2 + crc_size) || status & BIT0) { 4605 info->icount.rxshort++; 4606 framesize = 0; 4607 } else if (status & BIT1) { 4608 info->icount.rxcrc++; 4609 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) 4610 framesize = 0; 4611 } 4612 4613 #if SYNCLINK_GENERIC_HDLC 4614 if (framesize == 0) { 4615 info->netdev->stats.rx_errors++; 4616 info->netdev->stats.rx_frame_errors++; 4617 } 4618 #endif 4619 4620 DBGBH(("%s rx frame status=%04X size=%d\n", 4621 info->device_name, status, framesize)); 4622 DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx"); 4623 4624 if (framesize) { 4625 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) { 4626 framesize -= crc_size; 4627 crc_size = 0; 4628 } 4629 4630 if (framesize > info->max_frame_size + crc_size) 4631 info->icount.rxlong++; 4632 else { 4633 /* copy dma buffer(s) to contiguous temp buffer */ 4634 int copy_count = framesize; 4635 int i = start; 4636 unsigned char *p = info->tmp_rbuf; 4637 info->tmp_rbuf_count = framesize; 4638 4639 info->icount.rxok++; 4640 4641 while(copy_count) { 4642 int partial_count = min_t(int, copy_count, info->rbuf_fill_level); 4643 memcpy(p, info->rbufs[i].buf, partial_count); 4644 p += partial_count; 4645 copy_count -= partial_count; 4646 if (++i == info->rbuf_count) 4647 i = 0; 4648 } 4649 4650 if (info->params.crc_type & HDLC_CRC_RETURN_EX) { 4651 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK; 4652 framesize++; 4653 } 4654 4655 #if SYNCLINK_GENERIC_HDLC 4656 if (info->netcount) 4657 hdlcdev_rx(info,info->tmp_rbuf, framesize); 4658 else 4659 #endif 4660 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize); 4661 } 4662 } 4663 free_rbufs(info, start, end); 4664 return true; 4665 4666 cleanup: 4667 return false; 4668 } 4669 4670 /* 4671 * pass receive buffer (RAW synchronous mode) to tty layer 4672 * return true if buffer available, otherwise false 4673 */ 4674 static bool rx_get_buf(struct slgt_info *info) 4675 { 4676 unsigned int i = info->rbuf_current; 4677 unsigned int count; 4678 4679 if (!desc_complete(info->rbufs[i])) 4680 return false; 4681 count = desc_count(info->rbufs[i]); 4682 switch(info->params.mode) { 4683 case MGSL_MODE_MONOSYNC: 4684 case MGSL_MODE_BISYNC: 4685 case MGSL_MODE_XSYNC: 4686 /* ignore residue in byte synchronous modes */ 4687 if (desc_residue(info->rbufs[i])) 4688 count--; 4689 break; 4690 } 4691 DBGDATA(info, info->rbufs[i].buf, count, "rx"); 4692 DBGINFO(("rx_get_buf size=%d\n", count)); 4693 if (count) 4694 ldisc_receive_buf(info->port.tty, info->rbufs[i].buf, 4695 info->flag_buf, count); 4696 free_rbufs(info, i, i); 4697 return true; 4698 } 4699 4700 static void reset_tbufs(struct slgt_info *info) 4701 { 4702 unsigned int i; 4703 info->tbuf_current = 0; 4704 for (i=0 ; i < info->tbuf_count ; i++) { 4705 info->tbufs[i].status = 0; 4706 info->tbufs[i].count = 0; 4707 } 4708 } 4709 4710 /* 4711 * return number of free transmit DMA buffers 4712 */ 4713 static unsigned int free_tbuf_count(struct slgt_info *info) 4714 { 4715 unsigned int count = 0; 4716 unsigned int i = info->tbuf_current; 4717 4718 do 4719 { 4720 if (desc_count(info->tbufs[i])) 4721 break; /* buffer in use */ 4722 ++count; 4723 if (++i == info->tbuf_count) 4724 i=0; 4725 } while (i != info->tbuf_current); 4726 4727 /* if tx DMA active, last zero count buffer is in use */ 4728 if (count && (rd_reg32(info, TDCSR) & BIT0)) 4729 --count; 4730 4731 return count; 4732 } 4733 4734 /* 4735 * return number of bytes in unsent transmit DMA buffers 4736 * and the serial controller tx FIFO 4737 */ 4738 static unsigned int tbuf_bytes(struct slgt_info *info) 4739 { 4740 unsigned int total_count = 0; 4741 unsigned int i = info->tbuf_current; 4742 unsigned int reg_value; 4743 unsigned int count; 4744 unsigned int active_buf_count = 0; 4745 4746 /* 4747 * Add descriptor counts for all tx DMA buffers. 4748 * If count is zero (cleared by DMA controller after read), 4749 * the buffer is complete or is actively being read from. 4750 * 4751 * Record buf_count of last buffer with zero count starting 4752 * from current ring position. buf_count is mirror 4753 * copy of count and is not cleared by serial controller. 4754 * If DMA controller is active, that buffer is actively 4755 * being read so add to total. 4756 */ 4757 do { 4758 count = desc_count(info->tbufs[i]); 4759 if (count) 4760 total_count += count; 4761 else if (!total_count) 4762 active_buf_count = info->tbufs[i].buf_count; 4763 if (++i == info->tbuf_count) 4764 i = 0; 4765 } while (i != info->tbuf_current); 4766 4767 /* read tx DMA status register */ 4768 reg_value = rd_reg32(info, TDCSR); 4769 4770 /* if tx DMA active, last zero count buffer is in use */ 4771 if (reg_value & BIT0) 4772 total_count += active_buf_count; 4773 4774 /* add tx FIFO count = reg_value[15..8] */ 4775 total_count += (reg_value >> 8) & 0xff; 4776 4777 /* if transmitter active add one byte for shift register */ 4778 if (info->tx_active) 4779 total_count++; 4780 4781 return total_count; 4782 } 4783 4784 /* 4785 * load data into transmit DMA buffer ring and start transmitter if needed 4786 * return true if data accepted, otherwise false (buffers full) 4787 */ 4788 static bool tx_load(struct slgt_info *info, const char *buf, unsigned int size) 4789 { 4790 unsigned short count; 4791 unsigned int i; 4792 struct slgt_desc *d; 4793 4794 /* check required buffer space */ 4795 if (DIV_ROUND_UP(size, DMABUFSIZE) > free_tbuf_count(info)) 4796 return false; 4797 4798 DBGDATA(info, buf, size, "tx"); 4799 4800 /* 4801 * copy data to one or more DMA buffers in circular ring 4802 * tbuf_start = first buffer for this data 4803 * tbuf_current = next free buffer 4804 * 4805 * Copy all data before making data visible to DMA controller by 4806 * setting descriptor count of the first buffer. 4807 * This prevents an active DMA controller from reading the first DMA 4808 * buffers of a frame and stopping before the final buffers are filled. 4809 */ 4810 4811 info->tbuf_start = i = info->tbuf_current; 4812 4813 while (size) { 4814 d = &info->tbufs[i]; 4815 4816 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size); 4817 memcpy(d->buf, buf, count); 4818 4819 size -= count; 4820 buf += count; 4821 4822 /* 4823 * set EOF bit for last buffer of HDLC frame or 4824 * for every buffer in raw mode 4825 */ 4826 if ((!size && info->params.mode == MGSL_MODE_HDLC) || 4827 info->params.mode == MGSL_MODE_RAW) 4828 set_desc_eof(*d, 1); 4829 else 4830 set_desc_eof(*d, 0); 4831 4832 /* set descriptor count for all but first buffer */ 4833 if (i != info->tbuf_start) 4834 set_desc_count(*d, count); 4835 d->buf_count = count; 4836 4837 if (++i == info->tbuf_count) 4838 i = 0; 4839 } 4840 4841 info->tbuf_current = i; 4842 4843 /* set first buffer count to make new data visible to DMA controller */ 4844 d = &info->tbufs[info->tbuf_start]; 4845 set_desc_count(*d, d->buf_count); 4846 4847 /* start transmitter if needed and update transmit timeout */ 4848 if (!info->tx_active) 4849 tx_start(info); 4850 update_tx_timer(info); 4851 4852 return true; 4853 } 4854 4855 static int register_test(struct slgt_info *info) 4856 { 4857 static unsigned short patterns[] = 4858 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696}; 4859 static unsigned int count = ARRAY_SIZE(patterns); 4860 unsigned int i; 4861 int rc = 0; 4862 4863 for (i=0 ; i < count ; i++) { 4864 wr_reg16(info, TIR, patterns[i]); 4865 wr_reg16(info, BDR, patterns[(i+1)%count]); 4866 if ((rd_reg16(info, TIR) != patterns[i]) || 4867 (rd_reg16(info, BDR) != patterns[(i+1)%count])) { 4868 rc = -ENODEV; 4869 break; 4870 } 4871 } 4872 info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0; 4873 info->init_error = rc ? 0 : DiagStatus_AddressFailure; 4874 return rc; 4875 } 4876 4877 static int irq_test(struct slgt_info *info) 4878 { 4879 unsigned long timeout; 4880 unsigned long flags; 4881 struct tty_struct *oldtty = info->port.tty; 4882 u32 speed = info->params.data_rate; 4883 4884 info->params.data_rate = 921600; 4885 info->port.tty = NULL; 4886 4887 spin_lock_irqsave(&info->lock, flags); 4888 async_mode(info); 4889 slgt_irq_on(info, IRQ_TXIDLE); 4890 4891 /* enable transmitter */ 4892 wr_reg16(info, TCR, 4893 (unsigned short)(rd_reg16(info, TCR) | BIT1)); 4894 4895 /* write one byte and wait for tx idle */ 4896 wr_reg16(info, TDR, 0); 4897 4898 /* assume failure */ 4899 info->init_error = DiagStatus_IrqFailure; 4900 info->irq_occurred = false; 4901 4902 spin_unlock_irqrestore(&info->lock, flags); 4903 4904 timeout=100; 4905 while(timeout-- && !info->irq_occurred) 4906 msleep_interruptible(10); 4907 4908 spin_lock_irqsave(&info->lock,flags); 4909 reset_port(info); 4910 spin_unlock_irqrestore(&info->lock,flags); 4911 4912 info->params.data_rate = speed; 4913 info->port.tty = oldtty; 4914 4915 info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure; 4916 return info->irq_occurred ? 0 : -ENODEV; 4917 } 4918 4919 static int loopback_test_rx(struct slgt_info *info) 4920 { 4921 unsigned char *src, *dest; 4922 int count; 4923 4924 if (desc_complete(info->rbufs[0])) { 4925 count = desc_count(info->rbufs[0]); 4926 src = info->rbufs[0].buf; 4927 dest = info->tmp_rbuf; 4928 4929 for( ; count ; count-=2, src+=2) { 4930 /* src=data byte (src+1)=status byte */ 4931 if (!(*(src+1) & (BIT9 + BIT8))) { 4932 *dest = *src; 4933 dest++; 4934 info->tmp_rbuf_count++; 4935 } 4936 } 4937 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx"); 4938 return 1; 4939 } 4940 return 0; 4941 } 4942 4943 static int loopback_test(struct slgt_info *info) 4944 { 4945 #define TESTFRAMESIZE 20 4946 4947 unsigned long timeout; 4948 u16 count; 4949 unsigned char buf[TESTFRAMESIZE]; 4950 int rc = -ENODEV; 4951 unsigned long flags; 4952 4953 struct tty_struct *oldtty = info->port.tty; 4954 MGSL_PARAMS params; 4955 4956 memcpy(¶ms, &info->params, sizeof(params)); 4957 4958 info->params.mode = MGSL_MODE_ASYNC; 4959 info->params.data_rate = 921600; 4960 info->params.loopback = 1; 4961 info->port.tty = NULL; 4962 4963 /* build and send transmit frame */ 4964 for (count = 0; count < TESTFRAMESIZE; ++count) 4965 buf[count] = (unsigned char)count; 4966 4967 info->tmp_rbuf_count = 0; 4968 memset(info->tmp_rbuf, 0, TESTFRAMESIZE); 4969 4970 /* program hardware for HDLC and enabled receiver */ 4971 spin_lock_irqsave(&info->lock,flags); 4972 async_mode(info); 4973 rx_start(info); 4974 tx_load(info, buf, count); 4975 spin_unlock_irqrestore(&info->lock, flags); 4976 4977 /* wait for receive complete */ 4978 for (timeout = 100; timeout; --timeout) { 4979 msleep_interruptible(10); 4980 if (loopback_test_rx(info)) { 4981 rc = 0; 4982 break; 4983 } 4984 } 4985 4986 /* verify received frame length and contents */ 4987 if (!rc && (info->tmp_rbuf_count != count || 4988 memcmp(buf, info->tmp_rbuf, count))) { 4989 rc = -ENODEV; 4990 } 4991 4992 spin_lock_irqsave(&info->lock,flags); 4993 reset_adapter(info); 4994 spin_unlock_irqrestore(&info->lock,flags); 4995 4996 memcpy(&info->params, ¶ms, sizeof(info->params)); 4997 info->port.tty = oldtty; 4998 4999 info->init_error = rc ? DiagStatus_DmaFailure : 0; 5000 return rc; 5001 } 5002 5003 static int adapter_test(struct slgt_info *info) 5004 { 5005 DBGINFO(("testing %s\n", info->device_name)); 5006 if (register_test(info) < 0) { 5007 printk("register test failure %s addr=%08X\n", 5008 info->device_name, info->phys_reg_addr); 5009 } else if (irq_test(info) < 0) { 5010 printk("IRQ test failure %s IRQ=%d\n", 5011 info->device_name, info->irq_level); 5012 } else if (loopback_test(info) < 0) { 5013 printk("loopback test failure %s\n", info->device_name); 5014 } 5015 return info->init_error; 5016 } 5017 5018 /* 5019 * transmit timeout handler 5020 */ 5021 static void tx_timeout(struct timer_list *t) 5022 { 5023 struct slgt_info *info = from_timer(info, t, tx_timer); 5024 unsigned long flags; 5025 5026 DBGINFO(("%s tx_timeout\n", info->device_name)); 5027 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) { 5028 info->icount.txtimeout++; 5029 } 5030 spin_lock_irqsave(&info->lock,flags); 5031 tx_stop(info); 5032 spin_unlock_irqrestore(&info->lock,flags); 5033 5034 #if SYNCLINK_GENERIC_HDLC 5035 if (info->netcount) 5036 hdlcdev_tx_done(info); 5037 else 5038 #endif 5039 bh_transmit(info); 5040 } 5041 5042 /* 5043 * receive buffer polling timer 5044 */ 5045 static void rx_timeout(struct timer_list *t) 5046 { 5047 struct slgt_info *info = from_timer(info, t, rx_timer); 5048 unsigned long flags; 5049 5050 DBGINFO(("%s rx_timeout\n", info->device_name)); 5051 spin_lock_irqsave(&info->lock, flags); 5052 info->pending_bh |= BH_RECEIVE; 5053 spin_unlock_irqrestore(&info->lock, flags); 5054 bh_handler(&info->task); 5055 } 5056 5057