1 /* 2 * Device driver for Microgate SyncLink GT serial adapters. 3 * 4 * written by Paul Fulghum for Microgate Corporation 5 * paulkf@microgate.com 6 * 7 * Microgate and SyncLink are trademarks of Microgate Corporation 8 * 9 * This code is released under the GNU General Public License (GPL) 10 * 11 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 12 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 13 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 14 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 15 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 16 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 17 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 18 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 19 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 20 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 21 * OF THE POSSIBILITY OF SUCH DAMAGE. 22 */ 23 24 /* 25 * DEBUG OUTPUT DEFINITIONS 26 * 27 * uncomment lines below to enable specific types of debug output 28 * 29 * DBGINFO information - most verbose output 30 * DBGERR serious errors 31 * DBGBH bottom half service routine debugging 32 * DBGISR interrupt service routine debugging 33 * DBGDATA output receive and transmit data 34 * DBGTBUF output transmit DMA buffers and registers 35 * DBGRBUF output receive DMA buffers and registers 36 */ 37 38 #define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt 39 #define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt 40 #define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt 41 #define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt 42 #define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label)) 43 /*#define DBGTBUF(info) dump_tbufs(info)*/ 44 /*#define DBGRBUF(info) dump_rbufs(info)*/ 45 46 47 #include <linux/module.h> 48 #include <linux/errno.h> 49 #include <linux/signal.h> 50 #include <linux/sched.h> 51 #include <linux/timer.h> 52 #include <linux/interrupt.h> 53 #include <linux/pci.h> 54 #include <linux/tty.h> 55 #include <linux/tty_flip.h> 56 #include <linux/serial.h> 57 #include <linux/major.h> 58 #include <linux/string.h> 59 #include <linux/fcntl.h> 60 #include <linux/ptrace.h> 61 #include <linux/ioport.h> 62 #include <linux/mm.h> 63 #include <linux/seq_file.h> 64 #include <linux/slab.h> 65 #include <linux/netdevice.h> 66 #include <linux/vmalloc.h> 67 #include <linux/init.h> 68 #include <linux/delay.h> 69 #include <linux/ioctl.h> 70 #include <linux/termios.h> 71 #include <linux/bitops.h> 72 #include <linux/workqueue.h> 73 #include <linux/hdlc.h> 74 #include <linux/synclink.h> 75 76 #include <asm/io.h> 77 #include <asm/irq.h> 78 #include <asm/dma.h> 79 #include <asm/types.h> 80 #include <asm/uaccess.h> 81 82 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE)) 83 #define SYNCLINK_GENERIC_HDLC 1 84 #else 85 #define SYNCLINK_GENERIC_HDLC 0 86 #endif 87 88 /* 89 * module identification 90 */ 91 static char *driver_name = "SyncLink GT"; 92 static char *tty_driver_name = "synclink_gt"; 93 static char *tty_dev_prefix = "ttySLG"; 94 MODULE_LICENSE("GPL"); 95 #define MGSL_MAGIC 0x5401 96 #define MAX_DEVICES 32 97 98 static struct pci_device_id pci_table[] = { 99 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 100 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 101 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 102 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 103 {0,}, /* terminate list */ 104 }; 105 MODULE_DEVICE_TABLE(pci, pci_table); 106 107 static int init_one(struct pci_dev *dev,const struct pci_device_id *ent); 108 static void remove_one(struct pci_dev *dev); 109 static struct pci_driver pci_driver = { 110 .name = "synclink_gt", 111 .id_table = pci_table, 112 .probe = init_one, 113 .remove = __devexit_p(remove_one), 114 }; 115 116 static bool pci_registered; 117 118 /* 119 * module configuration and status 120 */ 121 static struct slgt_info *slgt_device_list; 122 static int slgt_device_count; 123 124 static int ttymajor; 125 static int debug_level; 126 static int maxframe[MAX_DEVICES]; 127 128 module_param(ttymajor, int, 0); 129 module_param(debug_level, int, 0); 130 module_param_array(maxframe, int, NULL, 0); 131 132 MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned"); 133 MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail"); 134 MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)"); 135 136 /* 137 * tty support and callbacks 138 */ 139 static struct tty_driver *serial_driver; 140 141 static int open(struct tty_struct *tty, struct file * filp); 142 static void close(struct tty_struct *tty, struct file * filp); 143 static void hangup(struct tty_struct *tty); 144 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios); 145 146 static int write(struct tty_struct *tty, const unsigned char *buf, int count); 147 static int put_char(struct tty_struct *tty, unsigned char ch); 148 static void send_xchar(struct tty_struct *tty, char ch); 149 static void wait_until_sent(struct tty_struct *tty, int timeout); 150 static int write_room(struct tty_struct *tty); 151 static void flush_chars(struct tty_struct *tty); 152 static void flush_buffer(struct tty_struct *tty); 153 static void tx_hold(struct tty_struct *tty); 154 static void tx_release(struct tty_struct *tty); 155 156 static int ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg); 157 static int chars_in_buffer(struct tty_struct *tty); 158 static void throttle(struct tty_struct * tty); 159 static void unthrottle(struct tty_struct * tty); 160 static int set_break(struct tty_struct *tty, int break_state); 161 162 /* 163 * generic HDLC support and callbacks 164 */ 165 #if SYNCLINK_GENERIC_HDLC 166 #define dev_to_port(D) (dev_to_hdlc(D)->priv) 167 static void hdlcdev_tx_done(struct slgt_info *info); 168 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size); 169 static int hdlcdev_init(struct slgt_info *info); 170 static void hdlcdev_exit(struct slgt_info *info); 171 #endif 172 173 174 /* 175 * device specific structures, macros and functions 176 */ 177 178 #define SLGT_MAX_PORTS 4 179 #define SLGT_REG_SIZE 256 180 181 /* 182 * conditional wait facility 183 */ 184 struct cond_wait { 185 struct cond_wait *next; 186 wait_queue_head_t q; 187 wait_queue_t wait; 188 unsigned int data; 189 }; 190 static void init_cond_wait(struct cond_wait *w, unsigned int data); 191 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w); 192 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w); 193 static void flush_cond_wait(struct cond_wait **head); 194 195 /* 196 * DMA buffer descriptor and access macros 197 */ 198 struct slgt_desc 199 { 200 __le16 count; 201 __le16 status; 202 __le32 pbuf; /* physical address of data buffer */ 203 __le32 next; /* physical address of next descriptor */ 204 205 /* driver book keeping */ 206 char *buf; /* virtual address of data buffer */ 207 unsigned int pdesc; /* physical address of this descriptor */ 208 dma_addr_t buf_dma_addr; 209 unsigned short buf_count; 210 }; 211 212 #define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b)) 213 #define set_desc_next(a,b) (a).next = cpu_to_le32((unsigned int)(b)) 214 #define set_desc_count(a,b)(a).count = cpu_to_le16((unsigned short)(b)) 215 #define set_desc_eof(a,b) (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0)) 216 #define set_desc_status(a, b) (a).status = cpu_to_le16((unsigned short)(b)) 217 #define desc_count(a) (le16_to_cpu((a).count)) 218 #define desc_status(a) (le16_to_cpu((a).status)) 219 #define desc_complete(a) (le16_to_cpu((a).status) & BIT15) 220 #define desc_eof(a) (le16_to_cpu((a).status) & BIT2) 221 #define desc_crc_error(a) (le16_to_cpu((a).status) & BIT1) 222 #define desc_abort(a) (le16_to_cpu((a).status) & BIT0) 223 #define desc_residue(a) ((le16_to_cpu((a).status) & 0x38) >> 3) 224 225 struct _input_signal_events { 226 int ri_up; 227 int ri_down; 228 int dsr_up; 229 int dsr_down; 230 int dcd_up; 231 int dcd_down; 232 int cts_up; 233 int cts_down; 234 }; 235 236 /* 237 * device instance data structure 238 */ 239 struct slgt_info { 240 void *if_ptr; /* General purpose pointer (used by SPPP) */ 241 struct tty_port port; 242 243 struct slgt_info *next_device; /* device list link */ 244 245 int magic; 246 247 char device_name[25]; 248 struct pci_dev *pdev; 249 250 int port_count; /* count of ports on adapter */ 251 int adapter_num; /* adapter instance number */ 252 int port_num; /* port instance number */ 253 254 /* array of pointers to port contexts on this adapter */ 255 struct slgt_info *port_array[SLGT_MAX_PORTS]; 256 257 int line; /* tty line instance number */ 258 259 struct mgsl_icount icount; 260 261 int timeout; 262 int x_char; /* xon/xoff character */ 263 unsigned int read_status_mask; 264 unsigned int ignore_status_mask; 265 266 wait_queue_head_t status_event_wait_q; 267 wait_queue_head_t event_wait_q; 268 struct timer_list tx_timer; 269 struct timer_list rx_timer; 270 271 unsigned int gpio_present; 272 struct cond_wait *gpio_wait_q; 273 274 spinlock_t lock; /* spinlock for synchronizing with ISR */ 275 276 struct work_struct task; 277 u32 pending_bh; 278 bool bh_requested; 279 bool bh_running; 280 281 int isr_overflow; 282 bool irq_requested; /* true if IRQ requested */ 283 bool irq_occurred; /* for diagnostics use */ 284 285 /* device configuration */ 286 287 unsigned int bus_type; 288 unsigned int irq_level; 289 unsigned long irq_flags; 290 291 unsigned char __iomem * reg_addr; /* memory mapped registers address */ 292 u32 phys_reg_addr; 293 bool reg_addr_requested; 294 295 MGSL_PARAMS params; /* communications parameters */ 296 u32 idle_mode; 297 u32 max_frame_size; /* as set by device config */ 298 299 unsigned int rbuf_fill_level; 300 unsigned int rx_pio; 301 unsigned int if_mode; 302 unsigned int base_clock; 303 unsigned int xsync; 304 unsigned int xctrl; 305 306 /* device status */ 307 308 bool rx_enabled; 309 bool rx_restart; 310 311 bool tx_enabled; 312 bool tx_active; 313 314 unsigned char signals; /* serial signal states */ 315 int init_error; /* initialization error */ 316 317 unsigned char *tx_buf; 318 int tx_count; 319 320 char flag_buf[MAX_ASYNC_BUFFER_SIZE]; 321 char char_buf[MAX_ASYNC_BUFFER_SIZE]; 322 bool drop_rts_on_tx_done; 323 struct _input_signal_events input_signal_events; 324 325 int dcd_chkcount; /* check counts to prevent */ 326 int cts_chkcount; /* too many IRQs if a signal */ 327 int dsr_chkcount; /* is floating */ 328 int ri_chkcount; 329 330 char *bufs; /* virtual address of DMA buffer lists */ 331 dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */ 332 333 unsigned int rbuf_count; 334 struct slgt_desc *rbufs; 335 unsigned int rbuf_current; 336 unsigned int rbuf_index; 337 unsigned int rbuf_fill_index; 338 unsigned short rbuf_fill_count; 339 340 unsigned int tbuf_count; 341 struct slgt_desc *tbufs; 342 unsigned int tbuf_current; 343 unsigned int tbuf_start; 344 345 unsigned char *tmp_rbuf; 346 unsigned int tmp_rbuf_count; 347 348 /* SPPP/Cisco HDLC device parts */ 349 350 int netcount; 351 spinlock_t netlock; 352 #if SYNCLINK_GENERIC_HDLC 353 struct net_device *netdev; 354 #endif 355 356 }; 357 358 static MGSL_PARAMS default_params = { 359 .mode = MGSL_MODE_HDLC, 360 .loopback = 0, 361 .flags = HDLC_FLAG_UNDERRUN_ABORT15, 362 .encoding = HDLC_ENCODING_NRZI_SPACE, 363 .clock_speed = 0, 364 .addr_filter = 0xff, 365 .crc_type = HDLC_CRC_16_CCITT, 366 .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS, 367 .preamble = HDLC_PREAMBLE_PATTERN_NONE, 368 .data_rate = 9600, 369 .data_bits = 8, 370 .stop_bits = 1, 371 .parity = ASYNC_PARITY_NONE 372 }; 373 374 375 #define BH_RECEIVE 1 376 #define BH_TRANSMIT 2 377 #define BH_STATUS 4 378 #define IO_PIN_SHUTDOWN_LIMIT 100 379 380 #define DMABUFSIZE 256 381 #define DESC_LIST_SIZE 4096 382 383 #define MASK_PARITY BIT1 384 #define MASK_FRAMING BIT0 385 #define MASK_BREAK BIT14 386 #define MASK_OVERRUN BIT4 387 388 #define GSR 0x00 /* global status */ 389 #define JCR 0x04 /* JTAG control */ 390 #define IODR 0x08 /* GPIO direction */ 391 #define IOER 0x0c /* GPIO interrupt enable */ 392 #define IOVR 0x10 /* GPIO value */ 393 #define IOSR 0x14 /* GPIO interrupt status */ 394 #define TDR 0x80 /* tx data */ 395 #define RDR 0x80 /* rx data */ 396 #define TCR 0x82 /* tx control */ 397 #define TIR 0x84 /* tx idle */ 398 #define TPR 0x85 /* tx preamble */ 399 #define RCR 0x86 /* rx control */ 400 #define VCR 0x88 /* V.24 control */ 401 #define CCR 0x89 /* clock control */ 402 #define BDR 0x8a /* baud divisor */ 403 #define SCR 0x8c /* serial control */ 404 #define SSR 0x8e /* serial status */ 405 #define RDCSR 0x90 /* rx DMA control/status */ 406 #define TDCSR 0x94 /* tx DMA control/status */ 407 #define RDDAR 0x98 /* rx DMA descriptor address */ 408 #define TDDAR 0x9c /* tx DMA descriptor address */ 409 #define XSR 0x40 /* extended sync pattern */ 410 #define XCR 0x44 /* extended control */ 411 412 #define RXIDLE BIT14 413 #define RXBREAK BIT14 414 #define IRQ_TXDATA BIT13 415 #define IRQ_TXIDLE BIT12 416 #define IRQ_TXUNDER BIT11 /* HDLC */ 417 #define IRQ_RXDATA BIT10 418 #define IRQ_RXIDLE BIT9 /* HDLC */ 419 #define IRQ_RXBREAK BIT9 /* async */ 420 #define IRQ_RXOVER BIT8 421 #define IRQ_DSR BIT7 422 #define IRQ_CTS BIT6 423 #define IRQ_DCD BIT5 424 #define IRQ_RI BIT4 425 #define IRQ_ALL 0x3ff0 426 #define IRQ_MASTER BIT0 427 428 #define slgt_irq_on(info, mask) \ 429 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask))) 430 #define slgt_irq_off(info, mask) \ 431 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask))) 432 433 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr); 434 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value); 435 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr); 436 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value); 437 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr); 438 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value); 439 440 static void msc_set_vcr(struct slgt_info *info); 441 442 static int startup(struct slgt_info *info); 443 static int block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info); 444 static void shutdown(struct slgt_info *info); 445 static void program_hw(struct slgt_info *info); 446 static void change_params(struct slgt_info *info); 447 448 static int register_test(struct slgt_info *info); 449 static int irq_test(struct slgt_info *info); 450 static int loopback_test(struct slgt_info *info); 451 static int adapter_test(struct slgt_info *info); 452 453 static void reset_adapter(struct slgt_info *info); 454 static void reset_port(struct slgt_info *info); 455 static void async_mode(struct slgt_info *info); 456 static void sync_mode(struct slgt_info *info); 457 458 static void rx_stop(struct slgt_info *info); 459 static void rx_start(struct slgt_info *info); 460 static void reset_rbufs(struct slgt_info *info); 461 static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last); 462 static void rdma_reset(struct slgt_info *info); 463 static bool rx_get_frame(struct slgt_info *info); 464 static bool rx_get_buf(struct slgt_info *info); 465 466 static void tx_start(struct slgt_info *info); 467 static void tx_stop(struct slgt_info *info); 468 static void tx_set_idle(struct slgt_info *info); 469 static unsigned int free_tbuf_count(struct slgt_info *info); 470 static unsigned int tbuf_bytes(struct slgt_info *info); 471 static void reset_tbufs(struct slgt_info *info); 472 static void tdma_reset(struct slgt_info *info); 473 static bool tx_load(struct slgt_info *info, const char *buf, unsigned int count); 474 475 static void get_signals(struct slgt_info *info); 476 static void set_signals(struct slgt_info *info); 477 static void enable_loopback(struct slgt_info *info); 478 static void set_rate(struct slgt_info *info, u32 data_rate); 479 480 static int bh_action(struct slgt_info *info); 481 static void bh_handler(struct work_struct *work); 482 static void bh_transmit(struct slgt_info *info); 483 static void isr_serial(struct slgt_info *info); 484 static void isr_rdma(struct slgt_info *info); 485 static void isr_txeom(struct slgt_info *info, unsigned short status); 486 static void isr_tdma(struct slgt_info *info); 487 488 static int alloc_dma_bufs(struct slgt_info *info); 489 static void free_dma_bufs(struct slgt_info *info); 490 static int alloc_desc(struct slgt_info *info); 491 static void free_desc(struct slgt_info *info); 492 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count); 493 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count); 494 495 static int alloc_tmp_rbuf(struct slgt_info *info); 496 static void free_tmp_rbuf(struct slgt_info *info); 497 498 static void tx_timeout(unsigned long context); 499 static void rx_timeout(unsigned long context); 500 501 /* 502 * ioctl handlers 503 */ 504 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount); 505 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *params); 506 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *params); 507 static int get_txidle(struct slgt_info *info, int __user *idle_mode); 508 static int set_txidle(struct slgt_info *info, int idle_mode); 509 static int tx_enable(struct slgt_info *info, int enable); 510 static int tx_abort(struct slgt_info *info); 511 static int rx_enable(struct slgt_info *info, int enable); 512 static int modem_input_wait(struct slgt_info *info,int arg); 513 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr); 514 static int tiocmget(struct tty_struct *tty); 515 static int tiocmset(struct tty_struct *tty, 516 unsigned int set, unsigned int clear); 517 static int set_break(struct tty_struct *tty, int break_state); 518 static int get_interface(struct slgt_info *info, int __user *if_mode); 519 static int set_interface(struct slgt_info *info, int if_mode); 520 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio); 521 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio); 522 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio); 523 static int get_xsync(struct slgt_info *info, int __user *if_mode); 524 static int set_xsync(struct slgt_info *info, int if_mode); 525 static int get_xctrl(struct slgt_info *info, int __user *if_mode); 526 static int set_xctrl(struct slgt_info *info, int if_mode); 527 528 /* 529 * driver functions 530 */ 531 static void add_device(struct slgt_info *info); 532 static void device_init(int adapter_num, struct pci_dev *pdev); 533 static int claim_resources(struct slgt_info *info); 534 static void release_resources(struct slgt_info *info); 535 536 /* 537 * DEBUG OUTPUT CODE 538 */ 539 #ifndef DBGINFO 540 #define DBGINFO(fmt) 541 #endif 542 #ifndef DBGERR 543 #define DBGERR(fmt) 544 #endif 545 #ifndef DBGBH 546 #define DBGBH(fmt) 547 #endif 548 #ifndef DBGISR 549 #define DBGISR(fmt) 550 #endif 551 552 #ifdef DBGDATA 553 static void trace_block(struct slgt_info *info, const char *data, int count, const char *label) 554 { 555 int i; 556 int linecount; 557 printk("%s %s data:\n",info->device_name, label); 558 while(count) { 559 linecount = (count > 16) ? 16 : count; 560 for(i=0; i < linecount; i++) 561 printk("%02X ",(unsigned char)data[i]); 562 for(;i<17;i++) 563 printk(" "); 564 for(i=0;i<linecount;i++) { 565 if (data[i]>=040 && data[i]<=0176) 566 printk("%c",data[i]); 567 else 568 printk("."); 569 } 570 printk("\n"); 571 data += linecount; 572 count -= linecount; 573 } 574 } 575 #else 576 #define DBGDATA(info, buf, size, label) 577 #endif 578 579 #ifdef DBGTBUF 580 static void dump_tbufs(struct slgt_info *info) 581 { 582 int i; 583 printk("tbuf_current=%d\n", info->tbuf_current); 584 for (i=0 ; i < info->tbuf_count ; i++) { 585 printk("%d: count=%04X status=%04X\n", 586 i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status)); 587 } 588 } 589 #else 590 #define DBGTBUF(info) 591 #endif 592 593 #ifdef DBGRBUF 594 static void dump_rbufs(struct slgt_info *info) 595 { 596 int i; 597 printk("rbuf_current=%d\n", info->rbuf_current); 598 for (i=0 ; i < info->rbuf_count ; i++) { 599 printk("%d: count=%04X status=%04X\n", 600 i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status)); 601 } 602 } 603 #else 604 #define DBGRBUF(info) 605 #endif 606 607 static inline int sanity_check(struct slgt_info *info, char *devname, const char *name) 608 { 609 #ifdef SANITY_CHECK 610 if (!info) { 611 printk("null struct slgt_info for (%s) in %s\n", devname, name); 612 return 1; 613 } 614 if (info->magic != MGSL_MAGIC) { 615 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name); 616 return 1; 617 } 618 #else 619 if (!info) 620 return 1; 621 #endif 622 return 0; 623 } 624 625 /** 626 * line discipline callback wrappers 627 * 628 * The wrappers maintain line discipline references 629 * while calling into the line discipline. 630 * 631 * ldisc_receive_buf - pass receive data to line discipline 632 */ 633 static void ldisc_receive_buf(struct tty_struct *tty, 634 const __u8 *data, char *flags, int count) 635 { 636 struct tty_ldisc *ld; 637 if (!tty) 638 return; 639 ld = tty_ldisc_ref(tty); 640 if (ld) { 641 if (ld->ops->receive_buf) 642 ld->ops->receive_buf(tty, data, flags, count); 643 tty_ldisc_deref(ld); 644 } 645 } 646 647 /* tty callbacks */ 648 649 static int open(struct tty_struct *tty, struct file *filp) 650 { 651 struct slgt_info *info; 652 int retval, line; 653 unsigned long flags; 654 655 line = tty->index; 656 if (line >= slgt_device_count) { 657 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line)); 658 return -ENODEV; 659 } 660 661 info = slgt_device_list; 662 while(info && info->line != line) 663 info = info->next_device; 664 if (sanity_check(info, tty->name, "open")) 665 return -ENODEV; 666 if (info->init_error) { 667 DBGERR(("%s init error=%d\n", info->device_name, info->init_error)); 668 return -ENODEV; 669 } 670 671 tty->driver_data = info; 672 info->port.tty = tty; 673 674 DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count)); 675 676 /* If port is closing, signal caller to try again */ 677 if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){ 678 if (info->port.flags & ASYNC_CLOSING) 679 interruptible_sleep_on(&info->port.close_wait); 680 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ? 681 -EAGAIN : -ERESTARTSYS); 682 goto cleanup; 683 } 684 685 mutex_lock(&info->port.mutex); 686 info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0; 687 688 spin_lock_irqsave(&info->netlock, flags); 689 if (info->netcount) { 690 retval = -EBUSY; 691 spin_unlock_irqrestore(&info->netlock, flags); 692 mutex_unlock(&info->port.mutex); 693 goto cleanup; 694 } 695 info->port.count++; 696 spin_unlock_irqrestore(&info->netlock, flags); 697 698 if (info->port.count == 1) { 699 /* 1st open on this device, init hardware */ 700 retval = startup(info); 701 if (retval < 0) { 702 mutex_unlock(&info->port.mutex); 703 goto cleanup; 704 } 705 } 706 mutex_unlock(&info->port.mutex); 707 retval = block_til_ready(tty, filp, info); 708 if (retval) { 709 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval)); 710 goto cleanup; 711 } 712 713 retval = 0; 714 715 cleanup: 716 if (retval) { 717 if (tty->count == 1) 718 info->port.tty = NULL; /* tty layer will release tty struct */ 719 if(info->port.count) 720 info->port.count--; 721 } 722 723 DBGINFO(("%s open rc=%d\n", info->device_name, retval)); 724 return retval; 725 } 726 727 static void close(struct tty_struct *tty, struct file *filp) 728 { 729 struct slgt_info *info = tty->driver_data; 730 731 if (sanity_check(info, tty->name, "close")) 732 return; 733 DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count)); 734 735 if (tty_port_close_start(&info->port, tty, filp) == 0) 736 goto cleanup; 737 738 mutex_lock(&info->port.mutex); 739 if (info->port.flags & ASYNC_INITIALIZED) 740 wait_until_sent(tty, info->timeout); 741 flush_buffer(tty); 742 tty_ldisc_flush(tty); 743 744 shutdown(info); 745 mutex_unlock(&info->port.mutex); 746 747 tty_port_close_end(&info->port, tty); 748 info->port.tty = NULL; 749 cleanup: 750 DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count)); 751 } 752 753 static void hangup(struct tty_struct *tty) 754 { 755 struct slgt_info *info = tty->driver_data; 756 unsigned long flags; 757 758 if (sanity_check(info, tty->name, "hangup")) 759 return; 760 DBGINFO(("%s hangup\n", info->device_name)); 761 762 flush_buffer(tty); 763 764 mutex_lock(&info->port.mutex); 765 shutdown(info); 766 767 spin_lock_irqsave(&info->port.lock, flags); 768 info->port.count = 0; 769 info->port.flags &= ~ASYNC_NORMAL_ACTIVE; 770 info->port.tty = NULL; 771 spin_unlock_irqrestore(&info->port.lock, flags); 772 mutex_unlock(&info->port.mutex); 773 774 wake_up_interruptible(&info->port.open_wait); 775 } 776 777 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios) 778 { 779 struct slgt_info *info = tty->driver_data; 780 unsigned long flags; 781 782 DBGINFO(("%s set_termios\n", tty->driver->name)); 783 784 change_params(info); 785 786 /* Handle transition to B0 status */ 787 if (old_termios->c_cflag & CBAUD && 788 !(tty->termios.c_cflag & CBAUD)) { 789 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR); 790 spin_lock_irqsave(&info->lock,flags); 791 set_signals(info); 792 spin_unlock_irqrestore(&info->lock,flags); 793 } 794 795 /* Handle transition away from B0 status */ 796 if (!(old_termios->c_cflag & CBAUD) && 797 tty->termios.c_cflag & CBAUD) { 798 info->signals |= SerialSignal_DTR; 799 if (!(tty->termios.c_cflag & CRTSCTS) || 800 !test_bit(TTY_THROTTLED, &tty->flags)) { 801 info->signals |= SerialSignal_RTS; 802 } 803 spin_lock_irqsave(&info->lock,flags); 804 set_signals(info); 805 spin_unlock_irqrestore(&info->lock,flags); 806 } 807 808 /* Handle turning off CRTSCTS */ 809 if (old_termios->c_cflag & CRTSCTS && 810 !(tty->termios.c_cflag & CRTSCTS)) { 811 tty->hw_stopped = 0; 812 tx_release(tty); 813 } 814 } 815 816 static void update_tx_timer(struct slgt_info *info) 817 { 818 /* 819 * use worst case speed of 1200bps to calculate transmit timeout 820 * based on data in buffers (tbuf_bytes) and FIFO (128 bytes) 821 */ 822 if (info->params.mode == MGSL_MODE_HDLC) { 823 int timeout = (tbuf_bytes(info) * 7) + 1000; 824 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(timeout)); 825 } 826 } 827 828 static int write(struct tty_struct *tty, 829 const unsigned char *buf, int count) 830 { 831 int ret = 0; 832 struct slgt_info *info = tty->driver_data; 833 unsigned long flags; 834 835 if (sanity_check(info, tty->name, "write")) 836 return -EIO; 837 838 DBGINFO(("%s write count=%d\n", info->device_name, count)); 839 840 if (!info->tx_buf || (count > info->max_frame_size)) 841 return -EIO; 842 843 if (!count || tty->stopped || tty->hw_stopped) 844 return 0; 845 846 spin_lock_irqsave(&info->lock, flags); 847 848 if (info->tx_count) { 849 /* send accumulated data from send_char() */ 850 if (!tx_load(info, info->tx_buf, info->tx_count)) 851 goto cleanup; 852 info->tx_count = 0; 853 } 854 855 if (tx_load(info, buf, count)) 856 ret = count; 857 858 cleanup: 859 spin_unlock_irqrestore(&info->lock, flags); 860 DBGINFO(("%s write rc=%d\n", info->device_name, ret)); 861 return ret; 862 } 863 864 static int put_char(struct tty_struct *tty, unsigned char ch) 865 { 866 struct slgt_info *info = tty->driver_data; 867 unsigned long flags; 868 int ret = 0; 869 870 if (sanity_check(info, tty->name, "put_char")) 871 return 0; 872 DBGINFO(("%s put_char(%d)\n", info->device_name, ch)); 873 if (!info->tx_buf) 874 return 0; 875 spin_lock_irqsave(&info->lock,flags); 876 if (info->tx_count < info->max_frame_size) { 877 info->tx_buf[info->tx_count++] = ch; 878 ret = 1; 879 } 880 spin_unlock_irqrestore(&info->lock,flags); 881 return ret; 882 } 883 884 static void send_xchar(struct tty_struct *tty, char ch) 885 { 886 struct slgt_info *info = tty->driver_data; 887 unsigned long flags; 888 889 if (sanity_check(info, tty->name, "send_xchar")) 890 return; 891 DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch)); 892 info->x_char = ch; 893 if (ch) { 894 spin_lock_irqsave(&info->lock,flags); 895 if (!info->tx_enabled) 896 tx_start(info); 897 spin_unlock_irqrestore(&info->lock,flags); 898 } 899 } 900 901 static void wait_until_sent(struct tty_struct *tty, int timeout) 902 { 903 struct slgt_info *info = tty->driver_data; 904 unsigned long orig_jiffies, char_time; 905 906 if (!info ) 907 return; 908 if (sanity_check(info, tty->name, "wait_until_sent")) 909 return; 910 DBGINFO(("%s wait_until_sent entry\n", info->device_name)); 911 if (!(info->port.flags & ASYNC_INITIALIZED)) 912 goto exit; 913 914 orig_jiffies = jiffies; 915 916 /* Set check interval to 1/5 of estimated time to 917 * send a character, and make it at least 1. The check 918 * interval should also be less than the timeout. 919 * Note: use tight timings here to satisfy the NIST-PCTS. 920 */ 921 922 if (info->params.data_rate) { 923 char_time = info->timeout/(32 * 5); 924 if (!char_time) 925 char_time++; 926 } else 927 char_time = 1; 928 929 if (timeout) 930 char_time = min_t(unsigned long, char_time, timeout); 931 932 while (info->tx_active) { 933 msleep_interruptible(jiffies_to_msecs(char_time)); 934 if (signal_pending(current)) 935 break; 936 if (timeout && time_after(jiffies, orig_jiffies + timeout)) 937 break; 938 } 939 exit: 940 DBGINFO(("%s wait_until_sent exit\n", info->device_name)); 941 } 942 943 static int write_room(struct tty_struct *tty) 944 { 945 struct slgt_info *info = tty->driver_data; 946 int ret; 947 948 if (sanity_check(info, tty->name, "write_room")) 949 return 0; 950 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE; 951 DBGINFO(("%s write_room=%d\n", info->device_name, ret)); 952 return ret; 953 } 954 955 static void flush_chars(struct tty_struct *tty) 956 { 957 struct slgt_info *info = tty->driver_data; 958 unsigned long flags; 959 960 if (sanity_check(info, tty->name, "flush_chars")) 961 return; 962 DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count)); 963 964 if (info->tx_count <= 0 || tty->stopped || 965 tty->hw_stopped || !info->tx_buf) 966 return; 967 968 DBGINFO(("%s flush_chars start transmit\n", info->device_name)); 969 970 spin_lock_irqsave(&info->lock,flags); 971 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count)) 972 info->tx_count = 0; 973 spin_unlock_irqrestore(&info->lock,flags); 974 } 975 976 static void flush_buffer(struct tty_struct *tty) 977 { 978 struct slgt_info *info = tty->driver_data; 979 unsigned long flags; 980 981 if (sanity_check(info, tty->name, "flush_buffer")) 982 return; 983 DBGINFO(("%s flush_buffer\n", info->device_name)); 984 985 spin_lock_irqsave(&info->lock, flags); 986 info->tx_count = 0; 987 spin_unlock_irqrestore(&info->lock, flags); 988 989 tty_wakeup(tty); 990 } 991 992 /* 993 * throttle (stop) transmitter 994 */ 995 static void tx_hold(struct tty_struct *tty) 996 { 997 struct slgt_info *info = tty->driver_data; 998 unsigned long flags; 999 1000 if (sanity_check(info, tty->name, "tx_hold")) 1001 return; 1002 DBGINFO(("%s tx_hold\n", info->device_name)); 1003 spin_lock_irqsave(&info->lock,flags); 1004 if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC) 1005 tx_stop(info); 1006 spin_unlock_irqrestore(&info->lock,flags); 1007 } 1008 1009 /* 1010 * release (start) transmitter 1011 */ 1012 static void tx_release(struct tty_struct *tty) 1013 { 1014 struct slgt_info *info = tty->driver_data; 1015 unsigned long flags; 1016 1017 if (sanity_check(info, tty->name, "tx_release")) 1018 return; 1019 DBGINFO(("%s tx_release\n", info->device_name)); 1020 spin_lock_irqsave(&info->lock, flags); 1021 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count)) 1022 info->tx_count = 0; 1023 spin_unlock_irqrestore(&info->lock, flags); 1024 } 1025 1026 /* 1027 * Service an IOCTL request 1028 * 1029 * Arguments 1030 * 1031 * tty pointer to tty instance data 1032 * cmd IOCTL command code 1033 * arg command argument/context 1034 * 1035 * Return 0 if success, otherwise error code 1036 */ 1037 static int ioctl(struct tty_struct *tty, 1038 unsigned int cmd, unsigned long arg) 1039 { 1040 struct slgt_info *info = tty->driver_data; 1041 void __user *argp = (void __user *)arg; 1042 int ret; 1043 1044 if (sanity_check(info, tty->name, "ioctl")) 1045 return -ENODEV; 1046 DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd)); 1047 1048 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && 1049 (cmd != TIOCMIWAIT)) { 1050 if (tty->flags & (1 << TTY_IO_ERROR)) 1051 return -EIO; 1052 } 1053 1054 switch (cmd) { 1055 case MGSL_IOCWAITEVENT: 1056 return wait_mgsl_event(info, argp); 1057 case TIOCMIWAIT: 1058 return modem_input_wait(info,(int)arg); 1059 case MGSL_IOCSGPIO: 1060 return set_gpio(info, argp); 1061 case MGSL_IOCGGPIO: 1062 return get_gpio(info, argp); 1063 case MGSL_IOCWAITGPIO: 1064 return wait_gpio(info, argp); 1065 case MGSL_IOCGXSYNC: 1066 return get_xsync(info, argp); 1067 case MGSL_IOCSXSYNC: 1068 return set_xsync(info, (int)arg); 1069 case MGSL_IOCGXCTRL: 1070 return get_xctrl(info, argp); 1071 case MGSL_IOCSXCTRL: 1072 return set_xctrl(info, (int)arg); 1073 } 1074 mutex_lock(&info->port.mutex); 1075 switch (cmd) { 1076 case MGSL_IOCGPARAMS: 1077 ret = get_params(info, argp); 1078 break; 1079 case MGSL_IOCSPARAMS: 1080 ret = set_params(info, argp); 1081 break; 1082 case MGSL_IOCGTXIDLE: 1083 ret = get_txidle(info, argp); 1084 break; 1085 case MGSL_IOCSTXIDLE: 1086 ret = set_txidle(info, (int)arg); 1087 break; 1088 case MGSL_IOCTXENABLE: 1089 ret = tx_enable(info, (int)arg); 1090 break; 1091 case MGSL_IOCRXENABLE: 1092 ret = rx_enable(info, (int)arg); 1093 break; 1094 case MGSL_IOCTXABORT: 1095 ret = tx_abort(info); 1096 break; 1097 case MGSL_IOCGSTATS: 1098 ret = get_stats(info, argp); 1099 break; 1100 case MGSL_IOCGIF: 1101 ret = get_interface(info, argp); 1102 break; 1103 case MGSL_IOCSIF: 1104 ret = set_interface(info,(int)arg); 1105 break; 1106 default: 1107 ret = -ENOIOCTLCMD; 1108 } 1109 mutex_unlock(&info->port.mutex); 1110 return ret; 1111 } 1112 1113 static int get_icount(struct tty_struct *tty, 1114 struct serial_icounter_struct *icount) 1115 1116 { 1117 struct slgt_info *info = tty->driver_data; 1118 struct mgsl_icount cnow; /* kernel counter temps */ 1119 unsigned long flags; 1120 1121 spin_lock_irqsave(&info->lock,flags); 1122 cnow = info->icount; 1123 spin_unlock_irqrestore(&info->lock,flags); 1124 1125 icount->cts = cnow.cts; 1126 icount->dsr = cnow.dsr; 1127 icount->rng = cnow.rng; 1128 icount->dcd = cnow.dcd; 1129 icount->rx = cnow.rx; 1130 icount->tx = cnow.tx; 1131 icount->frame = cnow.frame; 1132 icount->overrun = cnow.overrun; 1133 icount->parity = cnow.parity; 1134 icount->brk = cnow.brk; 1135 icount->buf_overrun = cnow.buf_overrun; 1136 1137 return 0; 1138 } 1139 1140 /* 1141 * support for 32 bit ioctl calls on 64 bit systems 1142 */ 1143 #ifdef CONFIG_COMPAT 1144 static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params) 1145 { 1146 struct MGSL_PARAMS32 tmp_params; 1147 1148 DBGINFO(("%s get_params32\n", info->device_name)); 1149 memset(&tmp_params, 0, sizeof(tmp_params)); 1150 tmp_params.mode = (compat_ulong_t)info->params.mode; 1151 tmp_params.loopback = info->params.loopback; 1152 tmp_params.flags = info->params.flags; 1153 tmp_params.encoding = info->params.encoding; 1154 tmp_params.clock_speed = (compat_ulong_t)info->params.clock_speed; 1155 tmp_params.addr_filter = info->params.addr_filter; 1156 tmp_params.crc_type = info->params.crc_type; 1157 tmp_params.preamble_length = info->params.preamble_length; 1158 tmp_params.preamble = info->params.preamble; 1159 tmp_params.data_rate = (compat_ulong_t)info->params.data_rate; 1160 tmp_params.data_bits = info->params.data_bits; 1161 tmp_params.stop_bits = info->params.stop_bits; 1162 tmp_params.parity = info->params.parity; 1163 if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32))) 1164 return -EFAULT; 1165 return 0; 1166 } 1167 1168 static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params) 1169 { 1170 struct MGSL_PARAMS32 tmp_params; 1171 1172 DBGINFO(("%s set_params32\n", info->device_name)); 1173 if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32))) 1174 return -EFAULT; 1175 1176 spin_lock(&info->lock); 1177 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) { 1178 info->base_clock = tmp_params.clock_speed; 1179 } else { 1180 info->params.mode = tmp_params.mode; 1181 info->params.loopback = tmp_params.loopback; 1182 info->params.flags = tmp_params.flags; 1183 info->params.encoding = tmp_params.encoding; 1184 info->params.clock_speed = tmp_params.clock_speed; 1185 info->params.addr_filter = tmp_params.addr_filter; 1186 info->params.crc_type = tmp_params.crc_type; 1187 info->params.preamble_length = tmp_params.preamble_length; 1188 info->params.preamble = tmp_params.preamble; 1189 info->params.data_rate = tmp_params.data_rate; 1190 info->params.data_bits = tmp_params.data_bits; 1191 info->params.stop_bits = tmp_params.stop_bits; 1192 info->params.parity = tmp_params.parity; 1193 } 1194 spin_unlock(&info->lock); 1195 1196 program_hw(info); 1197 1198 return 0; 1199 } 1200 1201 static long slgt_compat_ioctl(struct tty_struct *tty, 1202 unsigned int cmd, unsigned long arg) 1203 { 1204 struct slgt_info *info = tty->driver_data; 1205 int rc = -ENOIOCTLCMD; 1206 1207 if (sanity_check(info, tty->name, "compat_ioctl")) 1208 return -ENODEV; 1209 DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd)); 1210 1211 switch (cmd) { 1212 1213 case MGSL_IOCSPARAMS32: 1214 rc = set_params32(info, compat_ptr(arg)); 1215 break; 1216 1217 case MGSL_IOCGPARAMS32: 1218 rc = get_params32(info, compat_ptr(arg)); 1219 break; 1220 1221 case MGSL_IOCGPARAMS: 1222 case MGSL_IOCSPARAMS: 1223 case MGSL_IOCGTXIDLE: 1224 case MGSL_IOCGSTATS: 1225 case MGSL_IOCWAITEVENT: 1226 case MGSL_IOCGIF: 1227 case MGSL_IOCSGPIO: 1228 case MGSL_IOCGGPIO: 1229 case MGSL_IOCWAITGPIO: 1230 case MGSL_IOCGXSYNC: 1231 case MGSL_IOCGXCTRL: 1232 case MGSL_IOCSTXIDLE: 1233 case MGSL_IOCTXENABLE: 1234 case MGSL_IOCRXENABLE: 1235 case MGSL_IOCTXABORT: 1236 case TIOCMIWAIT: 1237 case MGSL_IOCSIF: 1238 case MGSL_IOCSXSYNC: 1239 case MGSL_IOCSXCTRL: 1240 rc = ioctl(tty, cmd, arg); 1241 break; 1242 } 1243 1244 DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc)); 1245 return rc; 1246 } 1247 #else 1248 #define slgt_compat_ioctl NULL 1249 #endif /* ifdef CONFIG_COMPAT */ 1250 1251 /* 1252 * proc fs support 1253 */ 1254 static inline void line_info(struct seq_file *m, struct slgt_info *info) 1255 { 1256 char stat_buf[30]; 1257 unsigned long flags; 1258 1259 seq_printf(m, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n", 1260 info->device_name, info->phys_reg_addr, 1261 info->irq_level, info->max_frame_size); 1262 1263 /* output current serial signal states */ 1264 spin_lock_irqsave(&info->lock,flags); 1265 get_signals(info); 1266 spin_unlock_irqrestore(&info->lock,flags); 1267 1268 stat_buf[0] = 0; 1269 stat_buf[1] = 0; 1270 if (info->signals & SerialSignal_RTS) 1271 strcat(stat_buf, "|RTS"); 1272 if (info->signals & SerialSignal_CTS) 1273 strcat(stat_buf, "|CTS"); 1274 if (info->signals & SerialSignal_DTR) 1275 strcat(stat_buf, "|DTR"); 1276 if (info->signals & SerialSignal_DSR) 1277 strcat(stat_buf, "|DSR"); 1278 if (info->signals & SerialSignal_DCD) 1279 strcat(stat_buf, "|CD"); 1280 if (info->signals & SerialSignal_RI) 1281 strcat(stat_buf, "|RI"); 1282 1283 if (info->params.mode != MGSL_MODE_ASYNC) { 1284 seq_printf(m, "\tHDLC txok:%d rxok:%d", 1285 info->icount.txok, info->icount.rxok); 1286 if (info->icount.txunder) 1287 seq_printf(m, " txunder:%d", info->icount.txunder); 1288 if (info->icount.txabort) 1289 seq_printf(m, " txabort:%d", info->icount.txabort); 1290 if (info->icount.rxshort) 1291 seq_printf(m, " rxshort:%d", info->icount.rxshort); 1292 if (info->icount.rxlong) 1293 seq_printf(m, " rxlong:%d", info->icount.rxlong); 1294 if (info->icount.rxover) 1295 seq_printf(m, " rxover:%d", info->icount.rxover); 1296 if (info->icount.rxcrc) 1297 seq_printf(m, " rxcrc:%d", info->icount.rxcrc); 1298 } else { 1299 seq_printf(m, "\tASYNC tx:%d rx:%d", 1300 info->icount.tx, info->icount.rx); 1301 if (info->icount.frame) 1302 seq_printf(m, " fe:%d", info->icount.frame); 1303 if (info->icount.parity) 1304 seq_printf(m, " pe:%d", info->icount.parity); 1305 if (info->icount.brk) 1306 seq_printf(m, " brk:%d", info->icount.brk); 1307 if (info->icount.overrun) 1308 seq_printf(m, " oe:%d", info->icount.overrun); 1309 } 1310 1311 /* Append serial signal status to end */ 1312 seq_printf(m, " %s\n", stat_buf+1); 1313 1314 seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n", 1315 info->tx_active,info->bh_requested,info->bh_running, 1316 info->pending_bh); 1317 } 1318 1319 /* Called to print information about devices 1320 */ 1321 static int synclink_gt_proc_show(struct seq_file *m, void *v) 1322 { 1323 struct slgt_info *info; 1324 1325 seq_puts(m, "synclink_gt driver\n"); 1326 1327 info = slgt_device_list; 1328 while( info ) { 1329 line_info(m, info); 1330 info = info->next_device; 1331 } 1332 return 0; 1333 } 1334 1335 static int synclink_gt_proc_open(struct inode *inode, struct file *file) 1336 { 1337 return single_open(file, synclink_gt_proc_show, NULL); 1338 } 1339 1340 static const struct file_operations synclink_gt_proc_fops = { 1341 .owner = THIS_MODULE, 1342 .open = synclink_gt_proc_open, 1343 .read = seq_read, 1344 .llseek = seq_lseek, 1345 .release = single_release, 1346 }; 1347 1348 /* 1349 * return count of bytes in transmit buffer 1350 */ 1351 static int chars_in_buffer(struct tty_struct *tty) 1352 { 1353 struct slgt_info *info = tty->driver_data; 1354 int count; 1355 if (sanity_check(info, tty->name, "chars_in_buffer")) 1356 return 0; 1357 count = tbuf_bytes(info); 1358 DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, count)); 1359 return count; 1360 } 1361 1362 /* 1363 * signal remote device to throttle send data (our receive data) 1364 */ 1365 static void throttle(struct tty_struct * tty) 1366 { 1367 struct slgt_info *info = tty->driver_data; 1368 unsigned long flags; 1369 1370 if (sanity_check(info, tty->name, "throttle")) 1371 return; 1372 DBGINFO(("%s throttle\n", info->device_name)); 1373 if (I_IXOFF(tty)) 1374 send_xchar(tty, STOP_CHAR(tty)); 1375 if (tty->termios.c_cflag & CRTSCTS) { 1376 spin_lock_irqsave(&info->lock,flags); 1377 info->signals &= ~SerialSignal_RTS; 1378 set_signals(info); 1379 spin_unlock_irqrestore(&info->lock,flags); 1380 } 1381 } 1382 1383 /* 1384 * signal remote device to stop throttling send data (our receive data) 1385 */ 1386 static void unthrottle(struct tty_struct * tty) 1387 { 1388 struct slgt_info *info = tty->driver_data; 1389 unsigned long flags; 1390 1391 if (sanity_check(info, tty->name, "unthrottle")) 1392 return; 1393 DBGINFO(("%s unthrottle\n", info->device_name)); 1394 if (I_IXOFF(tty)) { 1395 if (info->x_char) 1396 info->x_char = 0; 1397 else 1398 send_xchar(tty, START_CHAR(tty)); 1399 } 1400 if (tty->termios.c_cflag & CRTSCTS) { 1401 spin_lock_irqsave(&info->lock,flags); 1402 info->signals |= SerialSignal_RTS; 1403 set_signals(info); 1404 spin_unlock_irqrestore(&info->lock,flags); 1405 } 1406 } 1407 1408 /* 1409 * set or clear transmit break condition 1410 * break_state -1=set break condition, 0=clear 1411 */ 1412 static int set_break(struct tty_struct *tty, int break_state) 1413 { 1414 struct slgt_info *info = tty->driver_data; 1415 unsigned short value; 1416 unsigned long flags; 1417 1418 if (sanity_check(info, tty->name, "set_break")) 1419 return -EINVAL; 1420 DBGINFO(("%s set_break(%d)\n", info->device_name, break_state)); 1421 1422 spin_lock_irqsave(&info->lock,flags); 1423 value = rd_reg16(info, TCR); 1424 if (break_state == -1) 1425 value |= BIT6; 1426 else 1427 value &= ~BIT6; 1428 wr_reg16(info, TCR, value); 1429 spin_unlock_irqrestore(&info->lock,flags); 1430 return 0; 1431 } 1432 1433 #if SYNCLINK_GENERIC_HDLC 1434 1435 /** 1436 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.) 1437 * set encoding and frame check sequence (FCS) options 1438 * 1439 * dev pointer to network device structure 1440 * encoding serial encoding setting 1441 * parity FCS setting 1442 * 1443 * returns 0 if success, otherwise error code 1444 */ 1445 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding, 1446 unsigned short parity) 1447 { 1448 struct slgt_info *info = dev_to_port(dev); 1449 unsigned char new_encoding; 1450 unsigned short new_crctype; 1451 1452 /* return error if TTY interface open */ 1453 if (info->port.count) 1454 return -EBUSY; 1455 1456 DBGINFO(("%s hdlcdev_attach\n", info->device_name)); 1457 1458 switch (encoding) 1459 { 1460 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break; 1461 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break; 1462 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break; 1463 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break; 1464 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break; 1465 default: return -EINVAL; 1466 } 1467 1468 switch (parity) 1469 { 1470 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break; 1471 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break; 1472 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break; 1473 default: return -EINVAL; 1474 } 1475 1476 info->params.encoding = new_encoding; 1477 info->params.crc_type = new_crctype; 1478 1479 /* if network interface up, reprogram hardware */ 1480 if (info->netcount) 1481 program_hw(info); 1482 1483 return 0; 1484 } 1485 1486 /** 1487 * called by generic HDLC layer to send frame 1488 * 1489 * skb socket buffer containing HDLC frame 1490 * dev pointer to network device structure 1491 */ 1492 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb, 1493 struct net_device *dev) 1494 { 1495 struct slgt_info *info = dev_to_port(dev); 1496 unsigned long flags; 1497 1498 DBGINFO(("%s hdlc_xmit\n", dev->name)); 1499 1500 if (!skb->len) 1501 return NETDEV_TX_OK; 1502 1503 /* stop sending until this frame completes */ 1504 netif_stop_queue(dev); 1505 1506 /* update network statistics */ 1507 dev->stats.tx_packets++; 1508 dev->stats.tx_bytes += skb->len; 1509 1510 /* save start time for transmit timeout detection */ 1511 dev->trans_start = jiffies; 1512 1513 spin_lock_irqsave(&info->lock, flags); 1514 tx_load(info, skb->data, skb->len); 1515 spin_unlock_irqrestore(&info->lock, flags); 1516 1517 /* done with socket buffer, so free it */ 1518 dev_kfree_skb(skb); 1519 1520 return NETDEV_TX_OK; 1521 } 1522 1523 /** 1524 * called by network layer when interface enabled 1525 * claim resources and initialize hardware 1526 * 1527 * dev pointer to network device structure 1528 * 1529 * returns 0 if success, otherwise error code 1530 */ 1531 static int hdlcdev_open(struct net_device *dev) 1532 { 1533 struct slgt_info *info = dev_to_port(dev); 1534 int rc; 1535 unsigned long flags; 1536 1537 if (!try_module_get(THIS_MODULE)) 1538 return -EBUSY; 1539 1540 DBGINFO(("%s hdlcdev_open\n", dev->name)); 1541 1542 /* generic HDLC layer open processing */ 1543 if ((rc = hdlc_open(dev))) 1544 return rc; 1545 1546 /* arbitrate between network and tty opens */ 1547 spin_lock_irqsave(&info->netlock, flags); 1548 if (info->port.count != 0 || info->netcount != 0) { 1549 DBGINFO(("%s hdlc_open busy\n", dev->name)); 1550 spin_unlock_irqrestore(&info->netlock, flags); 1551 return -EBUSY; 1552 } 1553 info->netcount=1; 1554 spin_unlock_irqrestore(&info->netlock, flags); 1555 1556 /* claim resources and init adapter */ 1557 if ((rc = startup(info)) != 0) { 1558 spin_lock_irqsave(&info->netlock, flags); 1559 info->netcount=0; 1560 spin_unlock_irqrestore(&info->netlock, flags); 1561 return rc; 1562 } 1563 1564 /* assert DTR and RTS, apply hardware settings */ 1565 info->signals |= SerialSignal_RTS + SerialSignal_DTR; 1566 program_hw(info); 1567 1568 /* enable network layer transmit */ 1569 dev->trans_start = jiffies; 1570 netif_start_queue(dev); 1571 1572 /* inform generic HDLC layer of current DCD status */ 1573 spin_lock_irqsave(&info->lock, flags); 1574 get_signals(info); 1575 spin_unlock_irqrestore(&info->lock, flags); 1576 if (info->signals & SerialSignal_DCD) 1577 netif_carrier_on(dev); 1578 else 1579 netif_carrier_off(dev); 1580 return 0; 1581 } 1582 1583 /** 1584 * called by network layer when interface is disabled 1585 * shutdown hardware and release resources 1586 * 1587 * dev pointer to network device structure 1588 * 1589 * returns 0 if success, otherwise error code 1590 */ 1591 static int hdlcdev_close(struct net_device *dev) 1592 { 1593 struct slgt_info *info = dev_to_port(dev); 1594 unsigned long flags; 1595 1596 DBGINFO(("%s hdlcdev_close\n", dev->name)); 1597 1598 netif_stop_queue(dev); 1599 1600 /* shutdown adapter and release resources */ 1601 shutdown(info); 1602 1603 hdlc_close(dev); 1604 1605 spin_lock_irqsave(&info->netlock, flags); 1606 info->netcount=0; 1607 spin_unlock_irqrestore(&info->netlock, flags); 1608 1609 module_put(THIS_MODULE); 1610 return 0; 1611 } 1612 1613 /** 1614 * called by network layer to process IOCTL call to network device 1615 * 1616 * dev pointer to network device structure 1617 * ifr pointer to network interface request structure 1618 * cmd IOCTL command code 1619 * 1620 * returns 0 if success, otherwise error code 1621 */ 1622 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1623 { 1624 const size_t size = sizeof(sync_serial_settings); 1625 sync_serial_settings new_line; 1626 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync; 1627 struct slgt_info *info = dev_to_port(dev); 1628 unsigned int flags; 1629 1630 DBGINFO(("%s hdlcdev_ioctl\n", dev->name)); 1631 1632 /* return error if TTY interface open */ 1633 if (info->port.count) 1634 return -EBUSY; 1635 1636 if (cmd != SIOCWANDEV) 1637 return hdlc_ioctl(dev, ifr, cmd); 1638 1639 memset(&new_line, 0, sizeof(new_line)); 1640 1641 switch(ifr->ifr_settings.type) { 1642 case IF_GET_IFACE: /* return current sync_serial_settings */ 1643 1644 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL; 1645 if (ifr->ifr_settings.size < size) { 1646 ifr->ifr_settings.size = size; /* data size wanted */ 1647 return -ENOBUFS; 1648 } 1649 1650 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL | 1651 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN | 1652 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL | 1653 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); 1654 1655 switch (flags){ 1656 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break; 1657 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break; 1658 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break; 1659 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break; 1660 default: new_line.clock_type = CLOCK_DEFAULT; 1661 } 1662 1663 new_line.clock_rate = info->params.clock_speed; 1664 new_line.loopback = info->params.loopback ? 1:0; 1665 1666 if (copy_to_user(line, &new_line, size)) 1667 return -EFAULT; 1668 return 0; 1669 1670 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */ 1671 1672 if(!capable(CAP_NET_ADMIN)) 1673 return -EPERM; 1674 if (copy_from_user(&new_line, line, size)) 1675 return -EFAULT; 1676 1677 switch (new_line.clock_type) 1678 { 1679 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break; 1680 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break; 1681 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break; 1682 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break; 1683 case CLOCK_DEFAULT: flags = info->params.flags & 1684 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL | 1685 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN | 1686 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL | 1687 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break; 1688 default: return -EINVAL; 1689 } 1690 1691 if (new_line.loopback != 0 && new_line.loopback != 1) 1692 return -EINVAL; 1693 1694 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL | 1695 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN | 1696 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL | 1697 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); 1698 info->params.flags |= flags; 1699 1700 info->params.loopback = new_line.loopback; 1701 1702 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG)) 1703 info->params.clock_speed = new_line.clock_rate; 1704 else 1705 info->params.clock_speed = 0; 1706 1707 /* if network interface up, reprogram hardware */ 1708 if (info->netcount) 1709 program_hw(info); 1710 return 0; 1711 1712 default: 1713 return hdlc_ioctl(dev, ifr, cmd); 1714 } 1715 } 1716 1717 /** 1718 * called by network layer when transmit timeout is detected 1719 * 1720 * dev pointer to network device structure 1721 */ 1722 static void hdlcdev_tx_timeout(struct net_device *dev) 1723 { 1724 struct slgt_info *info = dev_to_port(dev); 1725 unsigned long flags; 1726 1727 DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name)); 1728 1729 dev->stats.tx_errors++; 1730 dev->stats.tx_aborted_errors++; 1731 1732 spin_lock_irqsave(&info->lock,flags); 1733 tx_stop(info); 1734 spin_unlock_irqrestore(&info->lock,flags); 1735 1736 netif_wake_queue(dev); 1737 } 1738 1739 /** 1740 * called by device driver when transmit completes 1741 * reenable network layer transmit if stopped 1742 * 1743 * info pointer to device instance information 1744 */ 1745 static void hdlcdev_tx_done(struct slgt_info *info) 1746 { 1747 if (netif_queue_stopped(info->netdev)) 1748 netif_wake_queue(info->netdev); 1749 } 1750 1751 /** 1752 * called by device driver when frame received 1753 * pass frame to network layer 1754 * 1755 * info pointer to device instance information 1756 * buf pointer to buffer contianing frame data 1757 * size count of data bytes in buf 1758 */ 1759 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size) 1760 { 1761 struct sk_buff *skb = dev_alloc_skb(size); 1762 struct net_device *dev = info->netdev; 1763 1764 DBGINFO(("%s hdlcdev_rx\n", dev->name)); 1765 1766 if (skb == NULL) { 1767 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name)); 1768 dev->stats.rx_dropped++; 1769 return; 1770 } 1771 1772 memcpy(skb_put(skb, size), buf, size); 1773 1774 skb->protocol = hdlc_type_trans(skb, dev); 1775 1776 dev->stats.rx_packets++; 1777 dev->stats.rx_bytes += size; 1778 1779 netif_rx(skb); 1780 } 1781 1782 static const struct net_device_ops hdlcdev_ops = { 1783 .ndo_open = hdlcdev_open, 1784 .ndo_stop = hdlcdev_close, 1785 .ndo_change_mtu = hdlc_change_mtu, 1786 .ndo_start_xmit = hdlc_start_xmit, 1787 .ndo_do_ioctl = hdlcdev_ioctl, 1788 .ndo_tx_timeout = hdlcdev_tx_timeout, 1789 }; 1790 1791 /** 1792 * called by device driver when adding device instance 1793 * do generic HDLC initialization 1794 * 1795 * info pointer to device instance information 1796 * 1797 * returns 0 if success, otherwise error code 1798 */ 1799 static int hdlcdev_init(struct slgt_info *info) 1800 { 1801 int rc; 1802 struct net_device *dev; 1803 hdlc_device *hdlc; 1804 1805 /* allocate and initialize network and HDLC layer objects */ 1806 1807 if (!(dev = alloc_hdlcdev(info))) { 1808 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name); 1809 return -ENOMEM; 1810 } 1811 1812 /* for network layer reporting purposes only */ 1813 dev->mem_start = info->phys_reg_addr; 1814 dev->mem_end = info->phys_reg_addr + SLGT_REG_SIZE - 1; 1815 dev->irq = info->irq_level; 1816 1817 /* network layer callbacks and settings */ 1818 dev->netdev_ops = &hdlcdev_ops; 1819 dev->watchdog_timeo = 10 * HZ; 1820 dev->tx_queue_len = 50; 1821 1822 /* generic HDLC layer callbacks and settings */ 1823 hdlc = dev_to_hdlc(dev); 1824 hdlc->attach = hdlcdev_attach; 1825 hdlc->xmit = hdlcdev_xmit; 1826 1827 /* register objects with HDLC layer */ 1828 if ((rc = register_hdlc_device(dev))) { 1829 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__); 1830 free_netdev(dev); 1831 return rc; 1832 } 1833 1834 info->netdev = dev; 1835 return 0; 1836 } 1837 1838 /** 1839 * called by device driver when removing device instance 1840 * do generic HDLC cleanup 1841 * 1842 * info pointer to device instance information 1843 */ 1844 static void hdlcdev_exit(struct slgt_info *info) 1845 { 1846 unregister_hdlc_device(info->netdev); 1847 free_netdev(info->netdev); 1848 info->netdev = NULL; 1849 } 1850 1851 #endif /* ifdef CONFIG_HDLC */ 1852 1853 /* 1854 * get async data from rx DMA buffers 1855 */ 1856 static void rx_async(struct slgt_info *info) 1857 { 1858 struct tty_struct *tty = info->port.tty; 1859 struct mgsl_icount *icount = &info->icount; 1860 unsigned int start, end; 1861 unsigned char *p; 1862 unsigned char status; 1863 struct slgt_desc *bufs = info->rbufs; 1864 int i, count; 1865 int chars = 0; 1866 int stat; 1867 unsigned char ch; 1868 1869 start = end = info->rbuf_current; 1870 1871 while(desc_complete(bufs[end])) { 1872 count = desc_count(bufs[end]) - info->rbuf_index; 1873 p = bufs[end].buf + info->rbuf_index; 1874 1875 DBGISR(("%s rx_async count=%d\n", info->device_name, count)); 1876 DBGDATA(info, p, count, "rx"); 1877 1878 for(i=0 ; i < count; i+=2, p+=2) { 1879 ch = *p; 1880 icount->rx++; 1881 1882 stat = 0; 1883 1884 if ((status = *(p+1) & (BIT1 + BIT0))) { 1885 if (status & BIT1) 1886 icount->parity++; 1887 else if (status & BIT0) 1888 icount->frame++; 1889 /* discard char if tty control flags say so */ 1890 if (status & info->ignore_status_mask) 1891 continue; 1892 if (status & BIT1) 1893 stat = TTY_PARITY; 1894 else if (status & BIT0) 1895 stat = TTY_FRAME; 1896 } 1897 if (tty) { 1898 tty_insert_flip_char(tty, ch, stat); 1899 chars++; 1900 } 1901 } 1902 1903 if (i < count) { 1904 /* receive buffer not completed */ 1905 info->rbuf_index += i; 1906 mod_timer(&info->rx_timer, jiffies + 1); 1907 break; 1908 } 1909 1910 info->rbuf_index = 0; 1911 free_rbufs(info, end, end); 1912 1913 if (++end == info->rbuf_count) 1914 end = 0; 1915 1916 /* if entire list searched then no frame available */ 1917 if (end == start) 1918 break; 1919 } 1920 1921 if (tty && chars) 1922 tty_flip_buffer_push(tty); 1923 } 1924 1925 /* 1926 * return next bottom half action to perform 1927 */ 1928 static int bh_action(struct slgt_info *info) 1929 { 1930 unsigned long flags; 1931 int rc; 1932 1933 spin_lock_irqsave(&info->lock,flags); 1934 1935 if (info->pending_bh & BH_RECEIVE) { 1936 info->pending_bh &= ~BH_RECEIVE; 1937 rc = BH_RECEIVE; 1938 } else if (info->pending_bh & BH_TRANSMIT) { 1939 info->pending_bh &= ~BH_TRANSMIT; 1940 rc = BH_TRANSMIT; 1941 } else if (info->pending_bh & BH_STATUS) { 1942 info->pending_bh &= ~BH_STATUS; 1943 rc = BH_STATUS; 1944 } else { 1945 /* Mark BH routine as complete */ 1946 info->bh_running = false; 1947 info->bh_requested = false; 1948 rc = 0; 1949 } 1950 1951 spin_unlock_irqrestore(&info->lock,flags); 1952 1953 return rc; 1954 } 1955 1956 /* 1957 * perform bottom half processing 1958 */ 1959 static void bh_handler(struct work_struct *work) 1960 { 1961 struct slgt_info *info = container_of(work, struct slgt_info, task); 1962 int action; 1963 1964 if (!info) 1965 return; 1966 info->bh_running = true; 1967 1968 while((action = bh_action(info))) { 1969 switch (action) { 1970 case BH_RECEIVE: 1971 DBGBH(("%s bh receive\n", info->device_name)); 1972 switch(info->params.mode) { 1973 case MGSL_MODE_ASYNC: 1974 rx_async(info); 1975 break; 1976 case MGSL_MODE_HDLC: 1977 while(rx_get_frame(info)); 1978 break; 1979 case MGSL_MODE_RAW: 1980 case MGSL_MODE_MONOSYNC: 1981 case MGSL_MODE_BISYNC: 1982 case MGSL_MODE_XSYNC: 1983 while(rx_get_buf(info)); 1984 break; 1985 } 1986 /* restart receiver if rx DMA buffers exhausted */ 1987 if (info->rx_restart) 1988 rx_start(info); 1989 break; 1990 case BH_TRANSMIT: 1991 bh_transmit(info); 1992 break; 1993 case BH_STATUS: 1994 DBGBH(("%s bh status\n", info->device_name)); 1995 info->ri_chkcount = 0; 1996 info->dsr_chkcount = 0; 1997 info->dcd_chkcount = 0; 1998 info->cts_chkcount = 0; 1999 break; 2000 default: 2001 DBGBH(("%s unknown action\n", info->device_name)); 2002 break; 2003 } 2004 } 2005 DBGBH(("%s bh_handler exit\n", info->device_name)); 2006 } 2007 2008 static void bh_transmit(struct slgt_info *info) 2009 { 2010 struct tty_struct *tty = info->port.tty; 2011 2012 DBGBH(("%s bh_transmit\n", info->device_name)); 2013 if (tty) 2014 tty_wakeup(tty); 2015 } 2016 2017 static void dsr_change(struct slgt_info *info, unsigned short status) 2018 { 2019 if (status & BIT3) { 2020 info->signals |= SerialSignal_DSR; 2021 info->input_signal_events.dsr_up++; 2022 } else { 2023 info->signals &= ~SerialSignal_DSR; 2024 info->input_signal_events.dsr_down++; 2025 } 2026 DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals)); 2027 if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) { 2028 slgt_irq_off(info, IRQ_DSR); 2029 return; 2030 } 2031 info->icount.dsr++; 2032 wake_up_interruptible(&info->status_event_wait_q); 2033 wake_up_interruptible(&info->event_wait_q); 2034 info->pending_bh |= BH_STATUS; 2035 } 2036 2037 static void cts_change(struct slgt_info *info, unsigned short status) 2038 { 2039 if (status & BIT2) { 2040 info->signals |= SerialSignal_CTS; 2041 info->input_signal_events.cts_up++; 2042 } else { 2043 info->signals &= ~SerialSignal_CTS; 2044 info->input_signal_events.cts_down++; 2045 } 2046 DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals)); 2047 if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) { 2048 slgt_irq_off(info, IRQ_CTS); 2049 return; 2050 } 2051 info->icount.cts++; 2052 wake_up_interruptible(&info->status_event_wait_q); 2053 wake_up_interruptible(&info->event_wait_q); 2054 info->pending_bh |= BH_STATUS; 2055 2056 if (tty_port_cts_enabled(&info->port)) { 2057 if (info->port.tty) { 2058 if (info->port.tty->hw_stopped) { 2059 if (info->signals & SerialSignal_CTS) { 2060 info->port.tty->hw_stopped = 0; 2061 info->pending_bh |= BH_TRANSMIT; 2062 return; 2063 } 2064 } else { 2065 if (!(info->signals & SerialSignal_CTS)) 2066 info->port.tty->hw_stopped = 1; 2067 } 2068 } 2069 } 2070 } 2071 2072 static void dcd_change(struct slgt_info *info, unsigned short status) 2073 { 2074 if (status & BIT1) { 2075 info->signals |= SerialSignal_DCD; 2076 info->input_signal_events.dcd_up++; 2077 } else { 2078 info->signals &= ~SerialSignal_DCD; 2079 info->input_signal_events.dcd_down++; 2080 } 2081 DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals)); 2082 if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) { 2083 slgt_irq_off(info, IRQ_DCD); 2084 return; 2085 } 2086 info->icount.dcd++; 2087 #if SYNCLINK_GENERIC_HDLC 2088 if (info->netcount) { 2089 if (info->signals & SerialSignal_DCD) 2090 netif_carrier_on(info->netdev); 2091 else 2092 netif_carrier_off(info->netdev); 2093 } 2094 #endif 2095 wake_up_interruptible(&info->status_event_wait_q); 2096 wake_up_interruptible(&info->event_wait_q); 2097 info->pending_bh |= BH_STATUS; 2098 2099 if (info->port.flags & ASYNC_CHECK_CD) { 2100 if (info->signals & SerialSignal_DCD) 2101 wake_up_interruptible(&info->port.open_wait); 2102 else { 2103 if (info->port.tty) 2104 tty_hangup(info->port.tty); 2105 } 2106 } 2107 } 2108 2109 static void ri_change(struct slgt_info *info, unsigned short status) 2110 { 2111 if (status & BIT0) { 2112 info->signals |= SerialSignal_RI; 2113 info->input_signal_events.ri_up++; 2114 } else { 2115 info->signals &= ~SerialSignal_RI; 2116 info->input_signal_events.ri_down++; 2117 } 2118 DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals)); 2119 if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) { 2120 slgt_irq_off(info, IRQ_RI); 2121 return; 2122 } 2123 info->icount.rng++; 2124 wake_up_interruptible(&info->status_event_wait_q); 2125 wake_up_interruptible(&info->event_wait_q); 2126 info->pending_bh |= BH_STATUS; 2127 } 2128 2129 static void isr_rxdata(struct slgt_info *info) 2130 { 2131 unsigned int count = info->rbuf_fill_count; 2132 unsigned int i = info->rbuf_fill_index; 2133 unsigned short reg; 2134 2135 while (rd_reg16(info, SSR) & IRQ_RXDATA) { 2136 reg = rd_reg16(info, RDR); 2137 DBGISR(("isr_rxdata %s RDR=%04X\n", info->device_name, reg)); 2138 if (desc_complete(info->rbufs[i])) { 2139 /* all buffers full */ 2140 rx_stop(info); 2141 info->rx_restart = 1; 2142 continue; 2143 } 2144 info->rbufs[i].buf[count++] = (unsigned char)reg; 2145 /* async mode saves status byte to buffer for each data byte */ 2146 if (info->params.mode == MGSL_MODE_ASYNC) 2147 info->rbufs[i].buf[count++] = (unsigned char)(reg >> 8); 2148 if (count == info->rbuf_fill_level || (reg & BIT10)) { 2149 /* buffer full or end of frame */ 2150 set_desc_count(info->rbufs[i], count); 2151 set_desc_status(info->rbufs[i], BIT15 | (reg >> 8)); 2152 info->rbuf_fill_count = count = 0; 2153 if (++i == info->rbuf_count) 2154 i = 0; 2155 info->pending_bh |= BH_RECEIVE; 2156 } 2157 } 2158 2159 info->rbuf_fill_index = i; 2160 info->rbuf_fill_count = count; 2161 } 2162 2163 static void isr_serial(struct slgt_info *info) 2164 { 2165 unsigned short status = rd_reg16(info, SSR); 2166 2167 DBGISR(("%s isr_serial status=%04X\n", info->device_name, status)); 2168 2169 wr_reg16(info, SSR, status); /* clear pending */ 2170 2171 info->irq_occurred = true; 2172 2173 if (info->params.mode == MGSL_MODE_ASYNC) { 2174 if (status & IRQ_TXIDLE) { 2175 if (info->tx_active) 2176 isr_txeom(info, status); 2177 } 2178 if (info->rx_pio && (status & IRQ_RXDATA)) 2179 isr_rxdata(info); 2180 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) { 2181 info->icount.brk++; 2182 /* process break detection if tty control allows */ 2183 if (info->port.tty) { 2184 if (!(status & info->ignore_status_mask)) { 2185 if (info->read_status_mask & MASK_BREAK) { 2186 tty_insert_flip_char(info->port.tty, 0, TTY_BREAK); 2187 if (info->port.flags & ASYNC_SAK) 2188 do_SAK(info->port.tty); 2189 } 2190 } 2191 } 2192 } 2193 } else { 2194 if (status & (IRQ_TXIDLE + IRQ_TXUNDER)) 2195 isr_txeom(info, status); 2196 if (info->rx_pio && (status & IRQ_RXDATA)) 2197 isr_rxdata(info); 2198 if (status & IRQ_RXIDLE) { 2199 if (status & RXIDLE) 2200 info->icount.rxidle++; 2201 else 2202 info->icount.exithunt++; 2203 wake_up_interruptible(&info->event_wait_q); 2204 } 2205 2206 if (status & IRQ_RXOVER) 2207 rx_start(info); 2208 } 2209 2210 if (status & IRQ_DSR) 2211 dsr_change(info, status); 2212 if (status & IRQ_CTS) 2213 cts_change(info, status); 2214 if (status & IRQ_DCD) 2215 dcd_change(info, status); 2216 if (status & IRQ_RI) 2217 ri_change(info, status); 2218 } 2219 2220 static void isr_rdma(struct slgt_info *info) 2221 { 2222 unsigned int status = rd_reg32(info, RDCSR); 2223 2224 DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status)); 2225 2226 /* RDCSR (rx DMA control/status) 2227 * 2228 * 31..07 reserved 2229 * 06 save status byte to DMA buffer 2230 * 05 error 2231 * 04 eol (end of list) 2232 * 03 eob (end of buffer) 2233 * 02 IRQ enable 2234 * 01 reset 2235 * 00 enable 2236 */ 2237 wr_reg32(info, RDCSR, status); /* clear pending */ 2238 2239 if (status & (BIT5 + BIT4)) { 2240 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name)); 2241 info->rx_restart = true; 2242 } 2243 info->pending_bh |= BH_RECEIVE; 2244 } 2245 2246 static void isr_tdma(struct slgt_info *info) 2247 { 2248 unsigned int status = rd_reg32(info, TDCSR); 2249 2250 DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status)); 2251 2252 /* TDCSR (tx DMA control/status) 2253 * 2254 * 31..06 reserved 2255 * 05 error 2256 * 04 eol (end of list) 2257 * 03 eob (end of buffer) 2258 * 02 IRQ enable 2259 * 01 reset 2260 * 00 enable 2261 */ 2262 wr_reg32(info, TDCSR, status); /* clear pending */ 2263 2264 if (status & (BIT5 + BIT4 + BIT3)) { 2265 // another transmit buffer has completed 2266 // run bottom half to get more send data from user 2267 info->pending_bh |= BH_TRANSMIT; 2268 } 2269 } 2270 2271 /* 2272 * return true if there are unsent tx DMA buffers, otherwise false 2273 * 2274 * if there are unsent buffers then info->tbuf_start 2275 * is set to index of first unsent buffer 2276 */ 2277 static bool unsent_tbufs(struct slgt_info *info) 2278 { 2279 unsigned int i = info->tbuf_current; 2280 bool rc = false; 2281 2282 /* 2283 * search backwards from last loaded buffer (precedes tbuf_current) 2284 * for first unsent buffer (desc_count > 0) 2285 */ 2286 2287 do { 2288 if (i) 2289 i--; 2290 else 2291 i = info->tbuf_count - 1; 2292 if (!desc_count(info->tbufs[i])) 2293 break; 2294 info->tbuf_start = i; 2295 rc = true; 2296 } while (i != info->tbuf_current); 2297 2298 return rc; 2299 } 2300 2301 static void isr_txeom(struct slgt_info *info, unsigned short status) 2302 { 2303 DBGISR(("%s txeom status=%04x\n", info->device_name, status)); 2304 2305 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER); 2306 tdma_reset(info); 2307 if (status & IRQ_TXUNDER) { 2308 unsigned short val = rd_reg16(info, TCR); 2309 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */ 2310 wr_reg16(info, TCR, val); /* clear reset bit */ 2311 } 2312 2313 if (info->tx_active) { 2314 if (info->params.mode != MGSL_MODE_ASYNC) { 2315 if (status & IRQ_TXUNDER) 2316 info->icount.txunder++; 2317 else if (status & IRQ_TXIDLE) 2318 info->icount.txok++; 2319 } 2320 2321 if (unsent_tbufs(info)) { 2322 tx_start(info); 2323 update_tx_timer(info); 2324 return; 2325 } 2326 info->tx_active = false; 2327 2328 del_timer(&info->tx_timer); 2329 2330 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) { 2331 info->signals &= ~SerialSignal_RTS; 2332 info->drop_rts_on_tx_done = false; 2333 set_signals(info); 2334 } 2335 2336 #if SYNCLINK_GENERIC_HDLC 2337 if (info->netcount) 2338 hdlcdev_tx_done(info); 2339 else 2340 #endif 2341 { 2342 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) { 2343 tx_stop(info); 2344 return; 2345 } 2346 info->pending_bh |= BH_TRANSMIT; 2347 } 2348 } 2349 } 2350 2351 static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state) 2352 { 2353 struct cond_wait *w, *prev; 2354 2355 /* wake processes waiting for specific transitions */ 2356 for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) { 2357 if (w->data & changed) { 2358 w->data = state; 2359 wake_up_interruptible(&w->q); 2360 if (prev != NULL) 2361 prev->next = w->next; 2362 else 2363 info->gpio_wait_q = w->next; 2364 } else 2365 prev = w; 2366 } 2367 } 2368 2369 /* interrupt service routine 2370 * 2371 * irq interrupt number 2372 * dev_id device ID supplied during interrupt registration 2373 */ 2374 static irqreturn_t slgt_interrupt(int dummy, void *dev_id) 2375 { 2376 struct slgt_info *info = dev_id; 2377 unsigned int gsr; 2378 unsigned int i; 2379 2380 DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level)); 2381 2382 while((gsr = rd_reg32(info, GSR) & 0xffffff00)) { 2383 DBGISR(("%s gsr=%08x\n", info->device_name, gsr)); 2384 info->irq_occurred = true; 2385 for(i=0; i < info->port_count ; i++) { 2386 if (info->port_array[i] == NULL) 2387 continue; 2388 spin_lock(&info->port_array[i]->lock); 2389 if (gsr & (BIT8 << i)) 2390 isr_serial(info->port_array[i]); 2391 if (gsr & (BIT16 << (i*2))) 2392 isr_rdma(info->port_array[i]); 2393 if (gsr & (BIT17 << (i*2))) 2394 isr_tdma(info->port_array[i]); 2395 spin_unlock(&info->port_array[i]->lock); 2396 } 2397 } 2398 2399 if (info->gpio_present) { 2400 unsigned int state; 2401 unsigned int changed; 2402 spin_lock(&info->lock); 2403 while ((changed = rd_reg32(info, IOSR)) != 0) { 2404 DBGISR(("%s iosr=%08x\n", info->device_name, changed)); 2405 /* read latched state of GPIO signals */ 2406 state = rd_reg32(info, IOVR); 2407 /* clear pending GPIO interrupt bits */ 2408 wr_reg32(info, IOSR, changed); 2409 for (i=0 ; i < info->port_count ; i++) { 2410 if (info->port_array[i] != NULL) 2411 isr_gpio(info->port_array[i], changed, state); 2412 } 2413 } 2414 spin_unlock(&info->lock); 2415 } 2416 2417 for(i=0; i < info->port_count ; i++) { 2418 struct slgt_info *port = info->port_array[i]; 2419 if (port == NULL) 2420 continue; 2421 spin_lock(&port->lock); 2422 if ((port->port.count || port->netcount) && 2423 port->pending_bh && !port->bh_running && 2424 !port->bh_requested) { 2425 DBGISR(("%s bh queued\n", port->device_name)); 2426 schedule_work(&port->task); 2427 port->bh_requested = true; 2428 } 2429 spin_unlock(&port->lock); 2430 } 2431 2432 DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level)); 2433 return IRQ_HANDLED; 2434 } 2435 2436 static int startup(struct slgt_info *info) 2437 { 2438 DBGINFO(("%s startup\n", info->device_name)); 2439 2440 if (info->port.flags & ASYNC_INITIALIZED) 2441 return 0; 2442 2443 if (!info->tx_buf) { 2444 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL); 2445 if (!info->tx_buf) { 2446 DBGERR(("%s can't allocate tx buffer\n", info->device_name)); 2447 return -ENOMEM; 2448 } 2449 } 2450 2451 info->pending_bh = 0; 2452 2453 memset(&info->icount, 0, sizeof(info->icount)); 2454 2455 /* program hardware for current parameters */ 2456 change_params(info); 2457 2458 if (info->port.tty) 2459 clear_bit(TTY_IO_ERROR, &info->port.tty->flags); 2460 2461 info->port.flags |= ASYNC_INITIALIZED; 2462 2463 return 0; 2464 } 2465 2466 /* 2467 * called by close() and hangup() to shutdown hardware 2468 */ 2469 static void shutdown(struct slgt_info *info) 2470 { 2471 unsigned long flags; 2472 2473 if (!(info->port.flags & ASYNC_INITIALIZED)) 2474 return; 2475 2476 DBGINFO(("%s shutdown\n", info->device_name)); 2477 2478 /* clear status wait queue because status changes */ 2479 /* can't happen after shutting down the hardware */ 2480 wake_up_interruptible(&info->status_event_wait_q); 2481 wake_up_interruptible(&info->event_wait_q); 2482 2483 del_timer_sync(&info->tx_timer); 2484 del_timer_sync(&info->rx_timer); 2485 2486 kfree(info->tx_buf); 2487 info->tx_buf = NULL; 2488 2489 spin_lock_irqsave(&info->lock,flags); 2490 2491 tx_stop(info); 2492 rx_stop(info); 2493 2494 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER); 2495 2496 if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) { 2497 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS); 2498 set_signals(info); 2499 } 2500 2501 flush_cond_wait(&info->gpio_wait_q); 2502 2503 spin_unlock_irqrestore(&info->lock,flags); 2504 2505 if (info->port.tty) 2506 set_bit(TTY_IO_ERROR, &info->port.tty->flags); 2507 2508 info->port.flags &= ~ASYNC_INITIALIZED; 2509 } 2510 2511 static void program_hw(struct slgt_info *info) 2512 { 2513 unsigned long flags; 2514 2515 spin_lock_irqsave(&info->lock,flags); 2516 2517 rx_stop(info); 2518 tx_stop(info); 2519 2520 if (info->params.mode != MGSL_MODE_ASYNC || 2521 info->netcount) 2522 sync_mode(info); 2523 else 2524 async_mode(info); 2525 2526 set_signals(info); 2527 2528 info->dcd_chkcount = 0; 2529 info->cts_chkcount = 0; 2530 info->ri_chkcount = 0; 2531 info->dsr_chkcount = 0; 2532 2533 slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI); 2534 get_signals(info); 2535 2536 if (info->netcount || 2537 (info->port.tty && info->port.tty->termios.c_cflag & CREAD)) 2538 rx_start(info); 2539 2540 spin_unlock_irqrestore(&info->lock,flags); 2541 } 2542 2543 /* 2544 * reconfigure adapter based on new parameters 2545 */ 2546 static void change_params(struct slgt_info *info) 2547 { 2548 unsigned cflag; 2549 int bits_per_char; 2550 2551 if (!info->port.tty) 2552 return; 2553 DBGINFO(("%s change_params\n", info->device_name)); 2554 2555 cflag = info->port.tty->termios.c_cflag; 2556 2557 /* if B0 rate (hangup) specified then negate DTR and RTS */ 2558 /* otherwise assert DTR and RTS */ 2559 if (cflag & CBAUD) 2560 info->signals |= SerialSignal_RTS + SerialSignal_DTR; 2561 else 2562 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR); 2563 2564 /* byte size and parity */ 2565 2566 switch (cflag & CSIZE) { 2567 case CS5: info->params.data_bits = 5; break; 2568 case CS6: info->params.data_bits = 6; break; 2569 case CS7: info->params.data_bits = 7; break; 2570 case CS8: info->params.data_bits = 8; break; 2571 default: info->params.data_bits = 7; break; 2572 } 2573 2574 info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1; 2575 2576 if (cflag & PARENB) 2577 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN; 2578 else 2579 info->params.parity = ASYNC_PARITY_NONE; 2580 2581 /* calculate number of jiffies to transmit a full 2582 * FIFO (32 bytes) at specified data rate 2583 */ 2584 bits_per_char = info->params.data_bits + 2585 info->params.stop_bits + 1; 2586 2587 info->params.data_rate = tty_get_baud_rate(info->port.tty); 2588 2589 if (info->params.data_rate) { 2590 info->timeout = (32*HZ*bits_per_char) / 2591 info->params.data_rate; 2592 } 2593 info->timeout += HZ/50; /* Add .02 seconds of slop */ 2594 2595 if (cflag & CRTSCTS) 2596 info->port.flags |= ASYNC_CTS_FLOW; 2597 else 2598 info->port.flags &= ~ASYNC_CTS_FLOW; 2599 2600 if (cflag & CLOCAL) 2601 info->port.flags &= ~ASYNC_CHECK_CD; 2602 else 2603 info->port.flags |= ASYNC_CHECK_CD; 2604 2605 /* process tty input control flags */ 2606 2607 info->read_status_mask = IRQ_RXOVER; 2608 if (I_INPCK(info->port.tty)) 2609 info->read_status_mask |= MASK_PARITY | MASK_FRAMING; 2610 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty)) 2611 info->read_status_mask |= MASK_BREAK; 2612 if (I_IGNPAR(info->port.tty)) 2613 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING; 2614 if (I_IGNBRK(info->port.tty)) { 2615 info->ignore_status_mask |= MASK_BREAK; 2616 /* If ignoring parity and break indicators, ignore 2617 * overruns too. (For real raw support). 2618 */ 2619 if (I_IGNPAR(info->port.tty)) 2620 info->ignore_status_mask |= MASK_OVERRUN; 2621 } 2622 2623 program_hw(info); 2624 } 2625 2626 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount) 2627 { 2628 DBGINFO(("%s get_stats\n", info->device_name)); 2629 if (!user_icount) { 2630 memset(&info->icount, 0, sizeof(info->icount)); 2631 } else { 2632 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount))) 2633 return -EFAULT; 2634 } 2635 return 0; 2636 } 2637 2638 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params) 2639 { 2640 DBGINFO(("%s get_params\n", info->device_name)); 2641 if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS))) 2642 return -EFAULT; 2643 return 0; 2644 } 2645 2646 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params) 2647 { 2648 unsigned long flags; 2649 MGSL_PARAMS tmp_params; 2650 2651 DBGINFO(("%s set_params\n", info->device_name)); 2652 if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS))) 2653 return -EFAULT; 2654 2655 spin_lock_irqsave(&info->lock, flags); 2656 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) 2657 info->base_clock = tmp_params.clock_speed; 2658 else 2659 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS)); 2660 spin_unlock_irqrestore(&info->lock, flags); 2661 2662 program_hw(info); 2663 2664 return 0; 2665 } 2666 2667 static int get_txidle(struct slgt_info *info, int __user *idle_mode) 2668 { 2669 DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode)); 2670 if (put_user(info->idle_mode, idle_mode)) 2671 return -EFAULT; 2672 return 0; 2673 } 2674 2675 static int set_txidle(struct slgt_info *info, int idle_mode) 2676 { 2677 unsigned long flags; 2678 DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode)); 2679 spin_lock_irqsave(&info->lock,flags); 2680 info->idle_mode = idle_mode; 2681 if (info->params.mode != MGSL_MODE_ASYNC) 2682 tx_set_idle(info); 2683 spin_unlock_irqrestore(&info->lock,flags); 2684 return 0; 2685 } 2686 2687 static int tx_enable(struct slgt_info *info, int enable) 2688 { 2689 unsigned long flags; 2690 DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable)); 2691 spin_lock_irqsave(&info->lock,flags); 2692 if (enable) { 2693 if (!info->tx_enabled) 2694 tx_start(info); 2695 } else { 2696 if (info->tx_enabled) 2697 tx_stop(info); 2698 } 2699 spin_unlock_irqrestore(&info->lock,flags); 2700 return 0; 2701 } 2702 2703 /* 2704 * abort transmit HDLC frame 2705 */ 2706 static int tx_abort(struct slgt_info *info) 2707 { 2708 unsigned long flags; 2709 DBGINFO(("%s tx_abort\n", info->device_name)); 2710 spin_lock_irqsave(&info->lock,flags); 2711 tdma_reset(info); 2712 spin_unlock_irqrestore(&info->lock,flags); 2713 return 0; 2714 } 2715 2716 static int rx_enable(struct slgt_info *info, int enable) 2717 { 2718 unsigned long flags; 2719 unsigned int rbuf_fill_level; 2720 DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable)); 2721 spin_lock_irqsave(&info->lock,flags); 2722 /* 2723 * enable[31..16] = receive DMA buffer fill level 2724 * 0 = noop (leave fill level unchanged) 2725 * fill level must be multiple of 4 and <= buffer size 2726 */ 2727 rbuf_fill_level = ((unsigned int)enable) >> 16; 2728 if (rbuf_fill_level) { 2729 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) { 2730 spin_unlock_irqrestore(&info->lock, flags); 2731 return -EINVAL; 2732 } 2733 info->rbuf_fill_level = rbuf_fill_level; 2734 if (rbuf_fill_level < 128) 2735 info->rx_pio = 1; /* PIO mode */ 2736 else 2737 info->rx_pio = 0; /* DMA mode */ 2738 rx_stop(info); /* restart receiver to use new fill level */ 2739 } 2740 2741 /* 2742 * enable[1..0] = receiver enable command 2743 * 0 = disable 2744 * 1 = enable 2745 * 2 = enable or force hunt mode if already enabled 2746 */ 2747 enable &= 3; 2748 if (enable) { 2749 if (!info->rx_enabled) 2750 rx_start(info); 2751 else if (enable == 2) { 2752 /* force hunt mode (write 1 to RCR[3]) */ 2753 wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3); 2754 } 2755 } else { 2756 if (info->rx_enabled) 2757 rx_stop(info); 2758 } 2759 spin_unlock_irqrestore(&info->lock,flags); 2760 return 0; 2761 } 2762 2763 /* 2764 * wait for specified event to occur 2765 */ 2766 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr) 2767 { 2768 unsigned long flags; 2769 int s; 2770 int rc=0; 2771 struct mgsl_icount cprev, cnow; 2772 int events; 2773 int mask; 2774 struct _input_signal_events oldsigs, newsigs; 2775 DECLARE_WAITQUEUE(wait, current); 2776 2777 if (get_user(mask, mask_ptr)) 2778 return -EFAULT; 2779 2780 DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask)); 2781 2782 spin_lock_irqsave(&info->lock,flags); 2783 2784 /* return immediately if state matches requested events */ 2785 get_signals(info); 2786 s = info->signals; 2787 2788 events = mask & 2789 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) + 2790 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) + 2791 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) + 2792 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) ); 2793 if (events) { 2794 spin_unlock_irqrestore(&info->lock,flags); 2795 goto exit; 2796 } 2797 2798 /* save current irq counts */ 2799 cprev = info->icount; 2800 oldsigs = info->input_signal_events; 2801 2802 /* enable hunt and idle irqs if needed */ 2803 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) { 2804 unsigned short val = rd_reg16(info, SCR); 2805 if (!(val & IRQ_RXIDLE)) 2806 wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE)); 2807 } 2808 2809 set_current_state(TASK_INTERRUPTIBLE); 2810 add_wait_queue(&info->event_wait_q, &wait); 2811 2812 spin_unlock_irqrestore(&info->lock,flags); 2813 2814 for(;;) { 2815 schedule(); 2816 if (signal_pending(current)) { 2817 rc = -ERESTARTSYS; 2818 break; 2819 } 2820 2821 /* get current irq counts */ 2822 spin_lock_irqsave(&info->lock,flags); 2823 cnow = info->icount; 2824 newsigs = info->input_signal_events; 2825 set_current_state(TASK_INTERRUPTIBLE); 2826 spin_unlock_irqrestore(&info->lock,flags); 2827 2828 /* if no change, wait aborted for some reason */ 2829 if (newsigs.dsr_up == oldsigs.dsr_up && 2830 newsigs.dsr_down == oldsigs.dsr_down && 2831 newsigs.dcd_up == oldsigs.dcd_up && 2832 newsigs.dcd_down == oldsigs.dcd_down && 2833 newsigs.cts_up == oldsigs.cts_up && 2834 newsigs.cts_down == oldsigs.cts_down && 2835 newsigs.ri_up == oldsigs.ri_up && 2836 newsigs.ri_down == oldsigs.ri_down && 2837 cnow.exithunt == cprev.exithunt && 2838 cnow.rxidle == cprev.rxidle) { 2839 rc = -EIO; 2840 break; 2841 } 2842 2843 events = mask & 2844 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) + 2845 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) + 2846 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) + 2847 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) + 2848 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) + 2849 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) + 2850 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) + 2851 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) + 2852 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) + 2853 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) ); 2854 if (events) 2855 break; 2856 2857 cprev = cnow; 2858 oldsigs = newsigs; 2859 } 2860 2861 remove_wait_queue(&info->event_wait_q, &wait); 2862 set_current_state(TASK_RUNNING); 2863 2864 2865 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) { 2866 spin_lock_irqsave(&info->lock,flags); 2867 if (!waitqueue_active(&info->event_wait_q)) { 2868 /* disable enable exit hunt mode/idle rcvd IRQs */ 2869 wr_reg16(info, SCR, 2870 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE)); 2871 } 2872 spin_unlock_irqrestore(&info->lock,flags); 2873 } 2874 exit: 2875 if (rc == 0) 2876 rc = put_user(events, mask_ptr); 2877 return rc; 2878 } 2879 2880 static int get_interface(struct slgt_info *info, int __user *if_mode) 2881 { 2882 DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode)); 2883 if (put_user(info->if_mode, if_mode)) 2884 return -EFAULT; 2885 return 0; 2886 } 2887 2888 static int set_interface(struct slgt_info *info, int if_mode) 2889 { 2890 unsigned long flags; 2891 unsigned short val; 2892 2893 DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode)); 2894 spin_lock_irqsave(&info->lock,flags); 2895 info->if_mode = if_mode; 2896 2897 msc_set_vcr(info); 2898 2899 /* TCR (tx control) 07 1=RTS driver control */ 2900 val = rd_reg16(info, TCR); 2901 if (info->if_mode & MGSL_INTERFACE_RTS_EN) 2902 val |= BIT7; 2903 else 2904 val &= ~BIT7; 2905 wr_reg16(info, TCR, val); 2906 2907 spin_unlock_irqrestore(&info->lock,flags); 2908 return 0; 2909 } 2910 2911 static int get_xsync(struct slgt_info *info, int __user *xsync) 2912 { 2913 DBGINFO(("%s get_xsync=%x\n", info->device_name, info->xsync)); 2914 if (put_user(info->xsync, xsync)) 2915 return -EFAULT; 2916 return 0; 2917 } 2918 2919 /* 2920 * set extended sync pattern (1 to 4 bytes) for extended sync mode 2921 * 2922 * sync pattern is contained in least significant bytes of value 2923 * most significant byte of sync pattern is oldest (1st sent/detected) 2924 */ 2925 static int set_xsync(struct slgt_info *info, int xsync) 2926 { 2927 unsigned long flags; 2928 2929 DBGINFO(("%s set_xsync=%x)\n", info->device_name, xsync)); 2930 spin_lock_irqsave(&info->lock, flags); 2931 info->xsync = xsync; 2932 wr_reg32(info, XSR, xsync); 2933 spin_unlock_irqrestore(&info->lock, flags); 2934 return 0; 2935 } 2936 2937 static int get_xctrl(struct slgt_info *info, int __user *xctrl) 2938 { 2939 DBGINFO(("%s get_xctrl=%x\n", info->device_name, info->xctrl)); 2940 if (put_user(info->xctrl, xctrl)) 2941 return -EFAULT; 2942 return 0; 2943 } 2944 2945 /* 2946 * set extended control options 2947 * 2948 * xctrl[31:19] reserved, must be zero 2949 * xctrl[18:17] extended sync pattern length in bytes 2950 * 00 = 1 byte in xsr[7:0] 2951 * 01 = 2 bytes in xsr[15:0] 2952 * 10 = 3 bytes in xsr[23:0] 2953 * 11 = 4 bytes in xsr[31:0] 2954 * xctrl[16] 1 = enable terminal count, 0=disabled 2955 * xctrl[15:0] receive terminal count for fixed length packets 2956 * value is count minus one (0 = 1 byte packet) 2957 * when terminal count is reached, receiver 2958 * automatically returns to hunt mode and receive 2959 * FIFO contents are flushed to DMA buffers with 2960 * end of frame (EOF) status 2961 */ 2962 static int set_xctrl(struct slgt_info *info, int xctrl) 2963 { 2964 unsigned long flags; 2965 2966 DBGINFO(("%s set_xctrl=%x)\n", info->device_name, xctrl)); 2967 spin_lock_irqsave(&info->lock, flags); 2968 info->xctrl = xctrl; 2969 wr_reg32(info, XCR, xctrl); 2970 spin_unlock_irqrestore(&info->lock, flags); 2971 return 0; 2972 } 2973 2974 /* 2975 * set general purpose IO pin state and direction 2976 * 2977 * user_gpio fields: 2978 * state each bit indicates a pin state 2979 * smask set bit indicates pin state to set 2980 * dir each bit indicates a pin direction (0=input, 1=output) 2981 * dmask set bit indicates pin direction to set 2982 */ 2983 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio) 2984 { 2985 unsigned long flags; 2986 struct gpio_desc gpio; 2987 __u32 data; 2988 2989 if (!info->gpio_present) 2990 return -EINVAL; 2991 if (copy_from_user(&gpio, user_gpio, sizeof(gpio))) 2992 return -EFAULT; 2993 DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n", 2994 info->device_name, gpio.state, gpio.smask, 2995 gpio.dir, gpio.dmask)); 2996 2997 spin_lock_irqsave(&info->port_array[0]->lock, flags); 2998 if (gpio.dmask) { 2999 data = rd_reg32(info, IODR); 3000 data |= gpio.dmask & gpio.dir; 3001 data &= ~(gpio.dmask & ~gpio.dir); 3002 wr_reg32(info, IODR, data); 3003 } 3004 if (gpio.smask) { 3005 data = rd_reg32(info, IOVR); 3006 data |= gpio.smask & gpio.state; 3007 data &= ~(gpio.smask & ~gpio.state); 3008 wr_reg32(info, IOVR, data); 3009 } 3010 spin_unlock_irqrestore(&info->port_array[0]->lock, flags); 3011 3012 return 0; 3013 } 3014 3015 /* 3016 * get general purpose IO pin state and direction 3017 */ 3018 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio) 3019 { 3020 struct gpio_desc gpio; 3021 if (!info->gpio_present) 3022 return -EINVAL; 3023 gpio.state = rd_reg32(info, IOVR); 3024 gpio.smask = 0xffffffff; 3025 gpio.dir = rd_reg32(info, IODR); 3026 gpio.dmask = 0xffffffff; 3027 if (copy_to_user(user_gpio, &gpio, sizeof(gpio))) 3028 return -EFAULT; 3029 DBGINFO(("%s get_gpio state=%08x dir=%08x\n", 3030 info->device_name, gpio.state, gpio.dir)); 3031 return 0; 3032 } 3033 3034 /* 3035 * conditional wait facility 3036 */ 3037 static void init_cond_wait(struct cond_wait *w, unsigned int data) 3038 { 3039 init_waitqueue_head(&w->q); 3040 init_waitqueue_entry(&w->wait, current); 3041 w->data = data; 3042 } 3043 3044 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w) 3045 { 3046 set_current_state(TASK_INTERRUPTIBLE); 3047 add_wait_queue(&w->q, &w->wait); 3048 w->next = *head; 3049 *head = w; 3050 } 3051 3052 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw) 3053 { 3054 struct cond_wait *w, *prev; 3055 remove_wait_queue(&cw->q, &cw->wait); 3056 set_current_state(TASK_RUNNING); 3057 for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) { 3058 if (w == cw) { 3059 if (prev != NULL) 3060 prev->next = w->next; 3061 else 3062 *head = w->next; 3063 break; 3064 } 3065 } 3066 } 3067 3068 static void flush_cond_wait(struct cond_wait **head) 3069 { 3070 while (*head != NULL) { 3071 wake_up_interruptible(&(*head)->q); 3072 *head = (*head)->next; 3073 } 3074 } 3075 3076 /* 3077 * wait for general purpose I/O pin(s) to enter specified state 3078 * 3079 * user_gpio fields: 3080 * state - bit indicates target pin state 3081 * smask - set bit indicates watched pin 3082 * 3083 * The wait ends when at least one watched pin enters the specified 3084 * state. When 0 (no error) is returned, user_gpio->state is set to the 3085 * state of all GPIO pins when the wait ends. 3086 * 3087 * Note: Each pin may be a dedicated input, dedicated output, or 3088 * configurable input/output. The number and configuration of pins 3089 * varies with the specific adapter model. Only input pins (dedicated 3090 * or configured) can be monitored with this function. 3091 */ 3092 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio) 3093 { 3094 unsigned long flags; 3095 int rc = 0; 3096 struct gpio_desc gpio; 3097 struct cond_wait wait; 3098 u32 state; 3099 3100 if (!info->gpio_present) 3101 return -EINVAL; 3102 if (copy_from_user(&gpio, user_gpio, sizeof(gpio))) 3103 return -EFAULT; 3104 DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n", 3105 info->device_name, gpio.state, gpio.smask)); 3106 /* ignore output pins identified by set IODR bit */ 3107 if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0) 3108 return -EINVAL; 3109 init_cond_wait(&wait, gpio.smask); 3110 3111 spin_lock_irqsave(&info->port_array[0]->lock, flags); 3112 /* enable interrupts for watched pins */ 3113 wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask); 3114 /* get current pin states */ 3115 state = rd_reg32(info, IOVR); 3116 3117 if (gpio.smask & ~(state ^ gpio.state)) { 3118 /* already in target state */ 3119 gpio.state = state; 3120 } else { 3121 /* wait for target state */ 3122 add_cond_wait(&info->gpio_wait_q, &wait); 3123 spin_unlock_irqrestore(&info->port_array[0]->lock, flags); 3124 schedule(); 3125 if (signal_pending(current)) 3126 rc = -ERESTARTSYS; 3127 else 3128 gpio.state = wait.data; 3129 spin_lock_irqsave(&info->port_array[0]->lock, flags); 3130 remove_cond_wait(&info->gpio_wait_q, &wait); 3131 } 3132 3133 /* disable all GPIO interrupts if no waiting processes */ 3134 if (info->gpio_wait_q == NULL) 3135 wr_reg32(info, IOER, 0); 3136 spin_unlock_irqrestore(&info->port_array[0]->lock, flags); 3137 3138 if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio))) 3139 rc = -EFAULT; 3140 return rc; 3141 } 3142 3143 static int modem_input_wait(struct slgt_info *info,int arg) 3144 { 3145 unsigned long flags; 3146 int rc; 3147 struct mgsl_icount cprev, cnow; 3148 DECLARE_WAITQUEUE(wait, current); 3149 3150 /* save current irq counts */ 3151 spin_lock_irqsave(&info->lock,flags); 3152 cprev = info->icount; 3153 add_wait_queue(&info->status_event_wait_q, &wait); 3154 set_current_state(TASK_INTERRUPTIBLE); 3155 spin_unlock_irqrestore(&info->lock,flags); 3156 3157 for(;;) { 3158 schedule(); 3159 if (signal_pending(current)) { 3160 rc = -ERESTARTSYS; 3161 break; 3162 } 3163 3164 /* get new irq counts */ 3165 spin_lock_irqsave(&info->lock,flags); 3166 cnow = info->icount; 3167 set_current_state(TASK_INTERRUPTIBLE); 3168 spin_unlock_irqrestore(&info->lock,flags); 3169 3170 /* if no change, wait aborted for some reason */ 3171 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 3172 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) { 3173 rc = -EIO; 3174 break; 3175 } 3176 3177 /* check for change in caller specified modem input */ 3178 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) || 3179 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) || 3180 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) || 3181 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) { 3182 rc = 0; 3183 break; 3184 } 3185 3186 cprev = cnow; 3187 } 3188 remove_wait_queue(&info->status_event_wait_q, &wait); 3189 set_current_state(TASK_RUNNING); 3190 return rc; 3191 } 3192 3193 /* 3194 * return state of serial control and status signals 3195 */ 3196 static int tiocmget(struct tty_struct *tty) 3197 { 3198 struct slgt_info *info = tty->driver_data; 3199 unsigned int result; 3200 unsigned long flags; 3201 3202 spin_lock_irqsave(&info->lock,flags); 3203 get_signals(info); 3204 spin_unlock_irqrestore(&info->lock,flags); 3205 3206 result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) + 3207 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) + 3208 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) + 3209 ((info->signals & SerialSignal_RI) ? TIOCM_RNG:0) + 3210 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) + 3211 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0); 3212 3213 DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result)); 3214 return result; 3215 } 3216 3217 /* 3218 * set modem control signals (DTR/RTS) 3219 * 3220 * cmd signal command: TIOCMBIS = set bit TIOCMBIC = clear bit 3221 * TIOCMSET = set/clear signal values 3222 * value bit mask for command 3223 */ 3224 static int tiocmset(struct tty_struct *tty, 3225 unsigned int set, unsigned int clear) 3226 { 3227 struct slgt_info *info = tty->driver_data; 3228 unsigned long flags; 3229 3230 DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear)); 3231 3232 if (set & TIOCM_RTS) 3233 info->signals |= SerialSignal_RTS; 3234 if (set & TIOCM_DTR) 3235 info->signals |= SerialSignal_DTR; 3236 if (clear & TIOCM_RTS) 3237 info->signals &= ~SerialSignal_RTS; 3238 if (clear & TIOCM_DTR) 3239 info->signals &= ~SerialSignal_DTR; 3240 3241 spin_lock_irqsave(&info->lock,flags); 3242 set_signals(info); 3243 spin_unlock_irqrestore(&info->lock,flags); 3244 return 0; 3245 } 3246 3247 static int carrier_raised(struct tty_port *port) 3248 { 3249 unsigned long flags; 3250 struct slgt_info *info = container_of(port, struct slgt_info, port); 3251 3252 spin_lock_irqsave(&info->lock,flags); 3253 get_signals(info); 3254 spin_unlock_irqrestore(&info->lock,flags); 3255 return (info->signals & SerialSignal_DCD) ? 1 : 0; 3256 } 3257 3258 static void dtr_rts(struct tty_port *port, int on) 3259 { 3260 unsigned long flags; 3261 struct slgt_info *info = container_of(port, struct slgt_info, port); 3262 3263 spin_lock_irqsave(&info->lock,flags); 3264 if (on) 3265 info->signals |= SerialSignal_RTS + SerialSignal_DTR; 3266 else 3267 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR); 3268 set_signals(info); 3269 spin_unlock_irqrestore(&info->lock,flags); 3270 } 3271 3272 3273 /* 3274 * block current process until the device is ready to open 3275 */ 3276 static int block_til_ready(struct tty_struct *tty, struct file *filp, 3277 struct slgt_info *info) 3278 { 3279 DECLARE_WAITQUEUE(wait, current); 3280 int retval; 3281 bool do_clocal = false; 3282 bool extra_count = false; 3283 unsigned long flags; 3284 int cd; 3285 struct tty_port *port = &info->port; 3286 3287 DBGINFO(("%s block_til_ready\n", tty->driver->name)); 3288 3289 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){ 3290 /* nonblock mode is set or port is not enabled */ 3291 port->flags |= ASYNC_NORMAL_ACTIVE; 3292 return 0; 3293 } 3294 3295 if (tty->termios.c_cflag & CLOCAL) 3296 do_clocal = true; 3297 3298 /* Wait for carrier detect and the line to become 3299 * free (i.e., not in use by the callout). While we are in 3300 * this loop, port->count is dropped by one, so that 3301 * close() knows when to free things. We restore it upon 3302 * exit, either normal or abnormal. 3303 */ 3304 3305 retval = 0; 3306 add_wait_queue(&port->open_wait, &wait); 3307 3308 spin_lock_irqsave(&info->lock, flags); 3309 if (!tty_hung_up_p(filp)) { 3310 extra_count = true; 3311 port->count--; 3312 } 3313 spin_unlock_irqrestore(&info->lock, flags); 3314 port->blocked_open++; 3315 3316 while (1) { 3317 if ((tty->termios.c_cflag & CBAUD)) 3318 tty_port_raise_dtr_rts(port); 3319 3320 set_current_state(TASK_INTERRUPTIBLE); 3321 3322 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){ 3323 retval = (port->flags & ASYNC_HUP_NOTIFY) ? 3324 -EAGAIN : -ERESTARTSYS; 3325 break; 3326 } 3327 3328 cd = tty_port_carrier_raised(port); 3329 3330 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd )) 3331 break; 3332 3333 if (signal_pending(current)) { 3334 retval = -ERESTARTSYS; 3335 break; 3336 } 3337 3338 DBGINFO(("%s block_til_ready wait\n", tty->driver->name)); 3339 tty_unlock(tty); 3340 schedule(); 3341 tty_lock(tty); 3342 } 3343 3344 set_current_state(TASK_RUNNING); 3345 remove_wait_queue(&port->open_wait, &wait); 3346 3347 if (extra_count) 3348 port->count++; 3349 port->blocked_open--; 3350 3351 if (!retval) 3352 port->flags |= ASYNC_NORMAL_ACTIVE; 3353 3354 DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval)); 3355 return retval; 3356 } 3357 3358 static int alloc_tmp_rbuf(struct slgt_info *info) 3359 { 3360 info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL); 3361 if (info->tmp_rbuf == NULL) 3362 return -ENOMEM; 3363 return 0; 3364 } 3365 3366 static void free_tmp_rbuf(struct slgt_info *info) 3367 { 3368 kfree(info->tmp_rbuf); 3369 info->tmp_rbuf = NULL; 3370 } 3371 3372 /* 3373 * allocate DMA descriptor lists. 3374 */ 3375 static int alloc_desc(struct slgt_info *info) 3376 { 3377 unsigned int i; 3378 unsigned int pbufs; 3379 3380 /* allocate memory to hold descriptor lists */ 3381 info->bufs = pci_alloc_consistent(info->pdev, DESC_LIST_SIZE, &info->bufs_dma_addr); 3382 if (info->bufs == NULL) 3383 return -ENOMEM; 3384 3385 memset(info->bufs, 0, DESC_LIST_SIZE); 3386 3387 info->rbufs = (struct slgt_desc*)info->bufs; 3388 info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count; 3389 3390 pbufs = (unsigned int)info->bufs_dma_addr; 3391 3392 /* 3393 * Build circular lists of descriptors 3394 */ 3395 3396 for (i=0; i < info->rbuf_count; i++) { 3397 /* physical address of this descriptor */ 3398 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc)); 3399 3400 /* physical address of next descriptor */ 3401 if (i == info->rbuf_count - 1) 3402 info->rbufs[i].next = cpu_to_le32(pbufs); 3403 else 3404 info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc))); 3405 set_desc_count(info->rbufs[i], DMABUFSIZE); 3406 } 3407 3408 for (i=0; i < info->tbuf_count; i++) { 3409 /* physical address of this descriptor */ 3410 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc)); 3411 3412 /* physical address of next descriptor */ 3413 if (i == info->tbuf_count - 1) 3414 info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc)); 3415 else 3416 info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc))); 3417 } 3418 3419 return 0; 3420 } 3421 3422 static void free_desc(struct slgt_info *info) 3423 { 3424 if (info->bufs != NULL) { 3425 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr); 3426 info->bufs = NULL; 3427 info->rbufs = NULL; 3428 info->tbufs = NULL; 3429 } 3430 } 3431 3432 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count) 3433 { 3434 int i; 3435 for (i=0; i < count; i++) { 3436 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL) 3437 return -ENOMEM; 3438 bufs[i].pbuf = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr); 3439 } 3440 return 0; 3441 } 3442 3443 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count) 3444 { 3445 int i; 3446 for (i=0; i < count; i++) { 3447 if (bufs[i].buf == NULL) 3448 continue; 3449 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr); 3450 bufs[i].buf = NULL; 3451 } 3452 } 3453 3454 static int alloc_dma_bufs(struct slgt_info *info) 3455 { 3456 info->rbuf_count = 32; 3457 info->tbuf_count = 32; 3458 3459 if (alloc_desc(info) < 0 || 3460 alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 || 3461 alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 || 3462 alloc_tmp_rbuf(info) < 0) { 3463 DBGERR(("%s DMA buffer alloc fail\n", info->device_name)); 3464 return -ENOMEM; 3465 } 3466 reset_rbufs(info); 3467 return 0; 3468 } 3469 3470 static void free_dma_bufs(struct slgt_info *info) 3471 { 3472 if (info->bufs) { 3473 free_bufs(info, info->rbufs, info->rbuf_count); 3474 free_bufs(info, info->tbufs, info->tbuf_count); 3475 free_desc(info); 3476 } 3477 free_tmp_rbuf(info); 3478 } 3479 3480 static int claim_resources(struct slgt_info *info) 3481 { 3482 if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) { 3483 DBGERR(("%s reg addr conflict, addr=%08X\n", 3484 info->device_name, info->phys_reg_addr)); 3485 info->init_error = DiagStatus_AddressConflict; 3486 goto errout; 3487 } 3488 else 3489 info->reg_addr_requested = true; 3490 3491 info->reg_addr = ioremap_nocache(info->phys_reg_addr, SLGT_REG_SIZE); 3492 if (!info->reg_addr) { 3493 DBGERR(("%s can't map device registers, addr=%08X\n", 3494 info->device_name, info->phys_reg_addr)); 3495 info->init_error = DiagStatus_CantAssignPciResources; 3496 goto errout; 3497 } 3498 return 0; 3499 3500 errout: 3501 release_resources(info); 3502 return -ENODEV; 3503 } 3504 3505 static void release_resources(struct slgt_info *info) 3506 { 3507 if (info->irq_requested) { 3508 free_irq(info->irq_level, info); 3509 info->irq_requested = false; 3510 } 3511 3512 if (info->reg_addr_requested) { 3513 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE); 3514 info->reg_addr_requested = false; 3515 } 3516 3517 if (info->reg_addr) { 3518 iounmap(info->reg_addr); 3519 info->reg_addr = NULL; 3520 } 3521 } 3522 3523 /* Add the specified device instance data structure to the 3524 * global linked list of devices and increment the device count. 3525 */ 3526 static void add_device(struct slgt_info *info) 3527 { 3528 char *devstr; 3529 3530 info->next_device = NULL; 3531 info->line = slgt_device_count; 3532 sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line); 3533 3534 if (info->line < MAX_DEVICES) { 3535 if (maxframe[info->line]) 3536 info->max_frame_size = maxframe[info->line]; 3537 } 3538 3539 slgt_device_count++; 3540 3541 if (!slgt_device_list) 3542 slgt_device_list = info; 3543 else { 3544 struct slgt_info *current_dev = slgt_device_list; 3545 while(current_dev->next_device) 3546 current_dev = current_dev->next_device; 3547 current_dev->next_device = info; 3548 } 3549 3550 if (info->max_frame_size < 4096) 3551 info->max_frame_size = 4096; 3552 else if (info->max_frame_size > 65535) 3553 info->max_frame_size = 65535; 3554 3555 switch(info->pdev->device) { 3556 case SYNCLINK_GT_DEVICE_ID: 3557 devstr = "GT"; 3558 break; 3559 case SYNCLINK_GT2_DEVICE_ID: 3560 devstr = "GT2"; 3561 break; 3562 case SYNCLINK_GT4_DEVICE_ID: 3563 devstr = "GT4"; 3564 break; 3565 case SYNCLINK_AC_DEVICE_ID: 3566 devstr = "AC"; 3567 info->params.mode = MGSL_MODE_ASYNC; 3568 break; 3569 default: 3570 devstr = "(unknown model)"; 3571 } 3572 printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n", 3573 devstr, info->device_name, info->phys_reg_addr, 3574 info->irq_level, info->max_frame_size); 3575 3576 #if SYNCLINK_GENERIC_HDLC 3577 hdlcdev_init(info); 3578 #endif 3579 } 3580 3581 static const struct tty_port_operations slgt_port_ops = { 3582 .carrier_raised = carrier_raised, 3583 .dtr_rts = dtr_rts, 3584 }; 3585 3586 /* 3587 * allocate device instance structure, return NULL on failure 3588 */ 3589 static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev) 3590 { 3591 struct slgt_info *info; 3592 3593 info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL); 3594 3595 if (!info) { 3596 DBGERR(("%s device alloc failed adapter=%d port=%d\n", 3597 driver_name, adapter_num, port_num)); 3598 } else { 3599 tty_port_init(&info->port); 3600 info->port.ops = &slgt_port_ops; 3601 info->magic = MGSL_MAGIC; 3602 INIT_WORK(&info->task, bh_handler); 3603 info->max_frame_size = 4096; 3604 info->base_clock = 14745600; 3605 info->rbuf_fill_level = DMABUFSIZE; 3606 info->port.close_delay = 5*HZ/10; 3607 info->port.closing_wait = 30*HZ; 3608 init_waitqueue_head(&info->status_event_wait_q); 3609 init_waitqueue_head(&info->event_wait_q); 3610 spin_lock_init(&info->netlock); 3611 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS)); 3612 info->idle_mode = HDLC_TXIDLE_FLAGS; 3613 info->adapter_num = adapter_num; 3614 info->port_num = port_num; 3615 3616 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info); 3617 setup_timer(&info->rx_timer, rx_timeout, (unsigned long)info); 3618 3619 /* Copy configuration info to device instance data */ 3620 info->pdev = pdev; 3621 info->irq_level = pdev->irq; 3622 info->phys_reg_addr = pci_resource_start(pdev,0); 3623 3624 info->bus_type = MGSL_BUS_TYPE_PCI; 3625 info->irq_flags = IRQF_SHARED; 3626 3627 info->init_error = -1; /* assume error, set to 0 on successful init */ 3628 } 3629 3630 return info; 3631 } 3632 3633 static void device_init(int adapter_num, struct pci_dev *pdev) 3634 { 3635 struct slgt_info *port_array[SLGT_MAX_PORTS]; 3636 int i; 3637 int port_count = 1; 3638 3639 if (pdev->device == SYNCLINK_GT2_DEVICE_ID) 3640 port_count = 2; 3641 else if (pdev->device == SYNCLINK_GT4_DEVICE_ID) 3642 port_count = 4; 3643 3644 /* allocate device instances for all ports */ 3645 for (i=0; i < port_count; ++i) { 3646 port_array[i] = alloc_dev(adapter_num, i, pdev); 3647 if (port_array[i] == NULL) { 3648 for (--i; i >= 0; --i) 3649 kfree(port_array[i]); 3650 return; 3651 } 3652 } 3653 3654 /* give copy of port_array to all ports and add to device list */ 3655 for (i=0; i < port_count; ++i) { 3656 memcpy(port_array[i]->port_array, port_array, sizeof(port_array)); 3657 add_device(port_array[i]); 3658 port_array[i]->port_count = port_count; 3659 spin_lock_init(&port_array[i]->lock); 3660 } 3661 3662 /* Allocate and claim adapter resources */ 3663 if (!claim_resources(port_array[0])) { 3664 3665 alloc_dma_bufs(port_array[0]); 3666 3667 /* copy resource information from first port to others */ 3668 for (i = 1; i < port_count; ++i) { 3669 port_array[i]->irq_level = port_array[0]->irq_level; 3670 port_array[i]->reg_addr = port_array[0]->reg_addr; 3671 alloc_dma_bufs(port_array[i]); 3672 } 3673 3674 if (request_irq(port_array[0]->irq_level, 3675 slgt_interrupt, 3676 port_array[0]->irq_flags, 3677 port_array[0]->device_name, 3678 port_array[0]) < 0) { 3679 DBGERR(("%s request_irq failed IRQ=%d\n", 3680 port_array[0]->device_name, 3681 port_array[0]->irq_level)); 3682 } else { 3683 port_array[0]->irq_requested = true; 3684 adapter_test(port_array[0]); 3685 for (i=1 ; i < port_count ; i++) { 3686 port_array[i]->init_error = port_array[0]->init_error; 3687 port_array[i]->gpio_present = port_array[0]->gpio_present; 3688 } 3689 } 3690 } 3691 3692 for (i = 0; i < port_count; ++i) { 3693 struct slgt_info *info = port_array[i]; 3694 tty_port_register_device(&info->port, serial_driver, info->line, 3695 &info->pdev->dev); 3696 } 3697 } 3698 3699 static int __devinit init_one(struct pci_dev *dev, 3700 const struct pci_device_id *ent) 3701 { 3702 if (pci_enable_device(dev)) { 3703 printk("error enabling pci device %p\n", dev); 3704 return -EIO; 3705 } 3706 pci_set_master(dev); 3707 device_init(slgt_device_count, dev); 3708 return 0; 3709 } 3710 3711 static void __devexit remove_one(struct pci_dev *dev) 3712 { 3713 } 3714 3715 static const struct tty_operations ops = { 3716 .open = open, 3717 .close = close, 3718 .write = write, 3719 .put_char = put_char, 3720 .flush_chars = flush_chars, 3721 .write_room = write_room, 3722 .chars_in_buffer = chars_in_buffer, 3723 .flush_buffer = flush_buffer, 3724 .ioctl = ioctl, 3725 .compat_ioctl = slgt_compat_ioctl, 3726 .throttle = throttle, 3727 .unthrottle = unthrottle, 3728 .send_xchar = send_xchar, 3729 .break_ctl = set_break, 3730 .wait_until_sent = wait_until_sent, 3731 .set_termios = set_termios, 3732 .stop = tx_hold, 3733 .start = tx_release, 3734 .hangup = hangup, 3735 .tiocmget = tiocmget, 3736 .tiocmset = tiocmset, 3737 .get_icount = get_icount, 3738 .proc_fops = &synclink_gt_proc_fops, 3739 }; 3740 3741 static void slgt_cleanup(void) 3742 { 3743 int rc; 3744 struct slgt_info *info; 3745 struct slgt_info *tmp; 3746 3747 printk(KERN_INFO "unload %s\n", driver_name); 3748 3749 if (serial_driver) { 3750 for (info=slgt_device_list ; info != NULL ; info=info->next_device) 3751 tty_unregister_device(serial_driver, info->line); 3752 if ((rc = tty_unregister_driver(serial_driver))) 3753 DBGERR(("tty_unregister_driver error=%d\n", rc)); 3754 put_tty_driver(serial_driver); 3755 } 3756 3757 /* reset devices */ 3758 info = slgt_device_list; 3759 while(info) { 3760 reset_port(info); 3761 info = info->next_device; 3762 } 3763 3764 /* release devices */ 3765 info = slgt_device_list; 3766 while(info) { 3767 #if SYNCLINK_GENERIC_HDLC 3768 hdlcdev_exit(info); 3769 #endif 3770 free_dma_bufs(info); 3771 free_tmp_rbuf(info); 3772 if (info->port_num == 0) 3773 release_resources(info); 3774 tmp = info; 3775 info = info->next_device; 3776 kfree(tmp); 3777 } 3778 3779 if (pci_registered) 3780 pci_unregister_driver(&pci_driver); 3781 } 3782 3783 /* 3784 * Driver initialization entry point. 3785 */ 3786 static int __init slgt_init(void) 3787 { 3788 int rc; 3789 3790 printk(KERN_INFO "%s\n", driver_name); 3791 3792 serial_driver = alloc_tty_driver(MAX_DEVICES); 3793 if (!serial_driver) { 3794 printk("%s can't allocate tty driver\n", driver_name); 3795 return -ENOMEM; 3796 } 3797 3798 /* Initialize the tty_driver structure */ 3799 3800 serial_driver->driver_name = tty_driver_name; 3801 serial_driver->name = tty_dev_prefix; 3802 serial_driver->major = ttymajor; 3803 serial_driver->minor_start = 64; 3804 serial_driver->type = TTY_DRIVER_TYPE_SERIAL; 3805 serial_driver->subtype = SERIAL_TYPE_NORMAL; 3806 serial_driver->init_termios = tty_std_termios; 3807 serial_driver->init_termios.c_cflag = 3808 B9600 | CS8 | CREAD | HUPCL | CLOCAL; 3809 serial_driver->init_termios.c_ispeed = 9600; 3810 serial_driver->init_termios.c_ospeed = 9600; 3811 serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 3812 tty_set_operations(serial_driver, &ops); 3813 if ((rc = tty_register_driver(serial_driver)) < 0) { 3814 DBGERR(("%s can't register serial driver\n", driver_name)); 3815 put_tty_driver(serial_driver); 3816 serial_driver = NULL; 3817 goto error; 3818 } 3819 3820 printk(KERN_INFO "%s, tty major#%d\n", 3821 driver_name, serial_driver->major); 3822 3823 slgt_device_count = 0; 3824 if ((rc = pci_register_driver(&pci_driver)) < 0) { 3825 printk("%s pci_register_driver error=%d\n", driver_name, rc); 3826 goto error; 3827 } 3828 pci_registered = true; 3829 3830 if (!slgt_device_list) 3831 printk("%s no devices found\n",driver_name); 3832 3833 return 0; 3834 3835 error: 3836 slgt_cleanup(); 3837 return rc; 3838 } 3839 3840 static void __exit slgt_exit(void) 3841 { 3842 slgt_cleanup(); 3843 } 3844 3845 module_init(slgt_init); 3846 module_exit(slgt_exit); 3847 3848 /* 3849 * register access routines 3850 */ 3851 3852 #define CALC_REGADDR() \ 3853 unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \ 3854 if (addr >= 0x80) \ 3855 reg_addr += (info->port_num) * 32; \ 3856 else if (addr >= 0x40) \ 3857 reg_addr += (info->port_num) * 16; 3858 3859 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr) 3860 { 3861 CALC_REGADDR(); 3862 return readb((void __iomem *)reg_addr); 3863 } 3864 3865 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value) 3866 { 3867 CALC_REGADDR(); 3868 writeb(value, (void __iomem *)reg_addr); 3869 } 3870 3871 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr) 3872 { 3873 CALC_REGADDR(); 3874 return readw((void __iomem *)reg_addr); 3875 } 3876 3877 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value) 3878 { 3879 CALC_REGADDR(); 3880 writew(value, (void __iomem *)reg_addr); 3881 } 3882 3883 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr) 3884 { 3885 CALC_REGADDR(); 3886 return readl((void __iomem *)reg_addr); 3887 } 3888 3889 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value) 3890 { 3891 CALC_REGADDR(); 3892 writel(value, (void __iomem *)reg_addr); 3893 } 3894 3895 static void rdma_reset(struct slgt_info *info) 3896 { 3897 unsigned int i; 3898 3899 /* set reset bit */ 3900 wr_reg32(info, RDCSR, BIT1); 3901 3902 /* wait for enable bit cleared */ 3903 for(i=0 ; i < 1000 ; i++) 3904 if (!(rd_reg32(info, RDCSR) & BIT0)) 3905 break; 3906 } 3907 3908 static void tdma_reset(struct slgt_info *info) 3909 { 3910 unsigned int i; 3911 3912 /* set reset bit */ 3913 wr_reg32(info, TDCSR, BIT1); 3914 3915 /* wait for enable bit cleared */ 3916 for(i=0 ; i < 1000 ; i++) 3917 if (!(rd_reg32(info, TDCSR) & BIT0)) 3918 break; 3919 } 3920 3921 /* 3922 * enable internal loopback 3923 * TxCLK and RxCLK are generated from BRG 3924 * and TxD is looped back to RxD internally. 3925 */ 3926 static void enable_loopback(struct slgt_info *info) 3927 { 3928 /* SCR (serial control) BIT2=loopback enable */ 3929 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2)); 3930 3931 if (info->params.mode != MGSL_MODE_ASYNC) { 3932 /* CCR (clock control) 3933 * 07..05 tx clock source (010 = BRG) 3934 * 04..02 rx clock source (010 = BRG) 3935 * 01 auxclk enable (0 = disable) 3936 * 00 BRG enable (1 = enable) 3937 * 3938 * 0100 1001 3939 */ 3940 wr_reg8(info, CCR, 0x49); 3941 3942 /* set speed if available, otherwise use default */ 3943 if (info->params.clock_speed) 3944 set_rate(info, info->params.clock_speed); 3945 else 3946 set_rate(info, 3686400); 3947 } 3948 } 3949 3950 /* 3951 * set baud rate generator to specified rate 3952 */ 3953 static void set_rate(struct slgt_info *info, u32 rate) 3954 { 3955 unsigned int div; 3956 unsigned int osc = info->base_clock; 3957 3958 /* div = osc/rate - 1 3959 * 3960 * Round div up if osc/rate is not integer to 3961 * force to next slowest rate. 3962 */ 3963 3964 if (rate) { 3965 div = osc/rate; 3966 if (!(osc % rate) && div) 3967 div--; 3968 wr_reg16(info, BDR, (unsigned short)div); 3969 } 3970 } 3971 3972 static void rx_stop(struct slgt_info *info) 3973 { 3974 unsigned short val; 3975 3976 /* disable and reset receiver */ 3977 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */ 3978 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */ 3979 wr_reg16(info, RCR, val); /* clear reset bit */ 3980 3981 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE); 3982 3983 /* clear pending rx interrupts */ 3984 wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER); 3985 3986 rdma_reset(info); 3987 3988 info->rx_enabled = false; 3989 info->rx_restart = false; 3990 } 3991 3992 static void rx_start(struct slgt_info *info) 3993 { 3994 unsigned short val; 3995 3996 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA); 3997 3998 /* clear pending rx overrun IRQ */ 3999 wr_reg16(info, SSR, IRQ_RXOVER); 4000 4001 /* reset and disable receiver */ 4002 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */ 4003 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */ 4004 wr_reg16(info, RCR, val); /* clear reset bit */ 4005 4006 rdma_reset(info); 4007 reset_rbufs(info); 4008 4009 if (info->rx_pio) { 4010 /* rx request when rx FIFO not empty */ 4011 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) & ~BIT14)); 4012 slgt_irq_on(info, IRQ_RXDATA); 4013 if (info->params.mode == MGSL_MODE_ASYNC) { 4014 /* enable saving of rx status */ 4015 wr_reg32(info, RDCSR, BIT6); 4016 } 4017 } else { 4018 /* rx request when rx FIFO half full */ 4019 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT14)); 4020 /* set 1st descriptor address */ 4021 wr_reg32(info, RDDAR, info->rbufs[0].pdesc); 4022 4023 if (info->params.mode != MGSL_MODE_ASYNC) { 4024 /* enable rx DMA and DMA interrupt */ 4025 wr_reg32(info, RDCSR, (BIT2 + BIT0)); 4026 } else { 4027 /* enable saving of rx status, rx DMA and DMA interrupt */ 4028 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0)); 4029 } 4030 } 4031 4032 slgt_irq_on(info, IRQ_RXOVER); 4033 4034 /* enable receiver */ 4035 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1)); 4036 4037 info->rx_restart = false; 4038 info->rx_enabled = true; 4039 } 4040 4041 static void tx_start(struct slgt_info *info) 4042 { 4043 if (!info->tx_enabled) { 4044 wr_reg16(info, TCR, 4045 (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2)); 4046 info->tx_enabled = true; 4047 } 4048 4049 if (desc_count(info->tbufs[info->tbuf_start])) { 4050 info->drop_rts_on_tx_done = false; 4051 4052 if (info->params.mode != MGSL_MODE_ASYNC) { 4053 if (info->params.flags & HDLC_FLAG_AUTO_RTS) { 4054 get_signals(info); 4055 if (!(info->signals & SerialSignal_RTS)) { 4056 info->signals |= SerialSignal_RTS; 4057 set_signals(info); 4058 info->drop_rts_on_tx_done = true; 4059 } 4060 } 4061 4062 slgt_irq_off(info, IRQ_TXDATA); 4063 slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE); 4064 /* clear tx idle and underrun status bits */ 4065 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER)); 4066 } else { 4067 slgt_irq_off(info, IRQ_TXDATA); 4068 slgt_irq_on(info, IRQ_TXIDLE); 4069 /* clear tx idle status bit */ 4070 wr_reg16(info, SSR, IRQ_TXIDLE); 4071 } 4072 /* set 1st descriptor address and start DMA */ 4073 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc); 4074 wr_reg32(info, TDCSR, BIT2 + BIT0); 4075 info->tx_active = true; 4076 } 4077 } 4078 4079 static void tx_stop(struct slgt_info *info) 4080 { 4081 unsigned short val; 4082 4083 del_timer(&info->tx_timer); 4084 4085 tdma_reset(info); 4086 4087 /* reset and disable transmitter */ 4088 val = rd_reg16(info, TCR) & ~BIT1; /* clear enable bit */ 4089 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */ 4090 4091 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER); 4092 4093 /* clear tx idle and underrun status bit */ 4094 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER)); 4095 4096 reset_tbufs(info); 4097 4098 info->tx_enabled = false; 4099 info->tx_active = false; 4100 } 4101 4102 static void reset_port(struct slgt_info *info) 4103 { 4104 if (!info->reg_addr) 4105 return; 4106 4107 tx_stop(info); 4108 rx_stop(info); 4109 4110 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS); 4111 set_signals(info); 4112 4113 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER); 4114 } 4115 4116 static void reset_adapter(struct slgt_info *info) 4117 { 4118 int i; 4119 for (i=0; i < info->port_count; ++i) { 4120 if (info->port_array[i]) 4121 reset_port(info->port_array[i]); 4122 } 4123 } 4124 4125 static void async_mode(struct slgt_info *info) 4126 { 4127 unsigned short val; 4128 4129 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER); 4130 tx_stop(info); 4131 rx_stop(info); 4132 4133 /* TCR (tx control) 4134 * 4135 * 15..13 mode, 010=async 4136 * 12..10 encoding, 000=NRZ 4137 * 09 parity enable 4138 * 08 1=odd parity, 0=even parity 4139 * 07 1=RTS driver control 4140 * 06 1=break enable 4141 * 05..04 character length 4142 * 00=5 bits 4143 * 01=6 bits 4144 * 10=7 bits 4145 * 11=8 bits 4146 * 03 0=1 stop bit, 1=2 stop bits 4147 * 02 reset 4148 * 01 enable 4149 * 00 auto-CTS enable 4150 */ 4151 val = 0x4000; 4152 4153 if (info->if_mode & MGSL_INTERFACE_RTS_EN) 4154 val |= BIT7; 4155 4156 if (info->params.parity != ASYNC_PARITY_NONE) { 4157 val |= BIT9; 4158 if (info->params.parity == ASYNC_PARITY_ODD) 4159 val |= BIT8; 4160 } 4161 4162 switch (info->params.data_bits) 4163 { 4164 case 6: val |= BIT4; break; 4165 case 7: val |= BIT5; break; 4166 case 8: val |= BIT5 + BIT4; break; 4167 } 4168 4169 if (info->params.stop_bits != 1) 4170 val |= BIT3; 4171 4172 if (info->params.flags & HDLC_FLAG_AUTO_CTS) 4173 val |= BIT0; 4174 4175 wr_reg16(info, TCR, val); 4176 4177 /* RCR (rx control) 4178 * 4179 * 15..13 mode, 010=async 4180 * 12..10 encoding, 000=NRZ 4181 * 09 parity enable 4182 * 08 1=odd parity, 0=even parity 4183 * 07..06 reserved, must be 0 4184 * 05..04 character length 4185 * 00=5 bits 4186 * 01=6 bits 4187 * 10=7 bits 4188 * 11=8 bits 4189 * 03 reserved, must be zero 4190 * 02 reset 4191 * 01 enable 4192 * 00 auto-DCD enable 4193 */ 4194 val = 0x4000; 4195 4196 if (info->params.parity != ASYNC_PARITY_NONE) { 4197 val |= BIT9; 4198 if (info->params.parity == ASYNC_PARITY_ODD) 4199 val |= BIT8; 4200 } 4201 4202 switch (info->params.data_bits) 4203 { 4204 case 6: val |= BIT4; break; 4205 case 7: val |= BIT5; break; 4206 case 8: val |= BIT5 + BIT4; break; 4207 } 4208 4209 if (info->params.flags & HDLC_FLAG_AUTO_DCD) 4210 val |= BIT0; 4211 4212 wr_reg16(info, RCR, val); 4213 4214 /* CCR (clock control) 4215 * 4216 * 07..05 011 = tx clock source is BRG/16 4217 * 04..02 010 = rx clock source is BRG 4218 * 01 0 = auxclk disabled 4219 * 00 1 = BRG enabled 4220 * 4221 * 0110 1001 4222 */ 4223 wr_reg8(info, CCR, 0x69); 4224 4225 msc_set_vcr(info); 4226 4227 /* SCR (serial control) 4228 * 4229 * 15 1=tx req on FIFO half empty 4230 * 14 1=rx req on FIFO half full 4231 * 13 tx data IRQ enable 4232 * 12 tx idle IRQ enable 4233 * 11 rx break on IRQ enable 4234 * 10 rx data IRQ enable 4235 * 09 rx break off IRQ enable 4236 * 08 overrun IRQ enable 4237 * 07 DSR IRQ enable 4238 * 06 CTS IRQ enable 4239 * 05 DCD IRQ enable 4240 * 04 RI IRQ enable 4241 * 03 0=16x sampling, 1=8x sampling 4242 * 02 1=txd->rxd internal loopback enable 4243 * 01 reserved, must be zero 4244 * 00 1=master IRQ enable 4245 */ 4246 val = BIT15 + BIT14 + BIT0; 4247 /* JCR[8] : 1 = x8 async mode feature available */ 4248 if ((rd_reg32(info, JCR) & BIT8) && info->params.data_rate && 4249 ((info->base_clock < (info->params.data_rate * 16)) || 4250 (info->base_clock % (info->params.data_rate * 16)))) { 4251 /* use 8x sampling */ 4252 val |= BIT3; 4253 set_rate(info, info->params.data_rate * 8); 4254 } else { 4255 /* use 16x sampling */ 4256 set_rate(info, info->params.data_rate * 16); 4257 } 4258 wr_reg16(info, SCR, val); 4259 4260 slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER); 4261 4262 if (info->params.loopback) 4263 enable_loopback(info); 4264 } 4265 4266 static void sync_mode(struct slgt_info *info) 4267 { 4268 unsigned short val; 4269 4270 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER); 4271 tx_stop(info); 4272 rx_stop(info); 4273 4274 /* TCR (tx control) 4275 * 4276 * 15..13 mode 4277 * 000=HDLC/SDLC 4278 * 001=raw bit synchronous 4279 * 010=asynchronous/isochronous 4280 * 011=monosync byte synchronous 4281 * 100=bisync byte synchronous 4282 * 101=xsync byte synchronous 4283 * 12..10 encoding 4284 * 09 CRC enable 4285 * 08 CRC32 4286 * 07 1=RTS driver control 4287 * 06 preamble enable 4288 * 05..04 preamble length 4289 * 03 share open/close flag 4290 * 02 reset 4291 * 01 enable 4292 * 00 auto-CTS enable 4293 */ 4294 val = BIT2; 4295 4296 switch(info->params.mode) { 4297 case MGSL_MODE_XSYNC: 4298 val |= BIT15 + BIT13; 4299 break; 4300 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break; 4301 case MGSL_MODE_BISYNC: val |= BIT15; break; 4302 case MGSL_MODE_RAW: val |= BIT13; break; 4303 } 4304 if (info->if_mode & MGSL_INTERFACE_RTS_EN) 4305 val |= BIT7; 4306 4307 switch(info->params.encoding) 4308 { 4309 case HDLC_ENCODING_NRZB: val |= BIT10; break; 4310 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break; 4311 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break; 4312 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break; 4313 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break; 4314 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break; 4315 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break; 4316 } 4317 4318 switch (info->params.crc_type & HDLC_CRC_MASK) 4319 { 4320 case HDLC_CRC_16_CCITT: val |= BIT9; break; 4321 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break; 4322 } 4323 4324 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE) 4325 val |= BIT6; 4326 4327 switch (info->params.preamble_length) 4328 { 4329 case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break; 4330 case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break; 4331 case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break; 4332 } 4333 4334 if (info->params.flags & HDLC_FLAG_AUTO_CTS) 4335 val |= BIT0; 4336 4337 wr_reg16(info, TCR, val); 4338 4339 /* TPR (transmit preamble) */ 4340 4341 switch (info->params.preamble) 4342 { 4343 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break; 4344 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break; 4345 case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break; 4346 case HDLC_PREAMBLE_PATTERN_10: val = 0x55; break; 4347 case HDLC_PREAMBLE_PATTERN_01: val = 0xaa; break; 4348 default: val = 0x7e; break; 4349 } 4350 wr_reg8(info, TPR, (unsigned char)val); 4351 4352 /* RCR (rx control) 4353 * 4354 * 15..13 mode 4355 * 000=HDLC/SDLC 4356 * 001=raw bit synchronous 4357 * 010=asynchronous/isochronous 4358 * 011=monosync byte synchronous 4359 * 100=bisync byte synchronous 4360 * 101=xsync byte synchronous 4361 * 12..10 encoding 4362 * 09 CRC enable 4363 * 08 CRC32 4364 * 07..03 reserved, must be 0 4365 * 02 reset 4366 * 01 enable 4367 * 00 auto-DCD enable 4368 */ 4369 val = 0; 4370 4371 switch(info->params.mode) { 4372 case MGSL_MODE_XSYNC: 4373 val |= BIT15 + BIT13; 4374 break; 4375 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break; 4376 case MGSL_MODE_BISYNC: val |= BIT15; break; 4377 case MGSL_MODE_RAW: val |= BIT13; break; 4378 } 4379 4380 switch(info->params.encoding) 4381 { 4382 case HDLC_ENCODING_NRZB: val |= BIT10; break; 4383 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break; 4384 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break; 4385 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break; 4386 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break; 4387 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break; 4388 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break; 4389 } 4390 4391 switch (info->params.crc_type & HDLC_CRC_MASK) 4392 { 4393 case HDLC_CRC_16_CCITT: val |= BIT9; break; 4394 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break; 4395 } 4396 4397 if (info->params.flags & HDLC_FLAG_AUTO_DCD) 4398 val |= BIT0; 4399 4400 wr_reg16(info, RCR, val); 4401 4402 /* CCR (clock control) 4403 * 4404 * 07..05 tx clock source 4405 * 04..02 rx clock source 4406 * 01 auxclk enable 4407 * 00 BRG enable 4408 */ 4409 val = 0; 4410 4411 if (info->params.flags & HDLC_FLAG_TXC_BRG) 4412 { 4413 // when RxC source is DPLL, BRG generates 16X DPLL 4414 // reference clock, so take TxC from BRG/16 to get 4415 // transmit clock at actual data rate 4416 if (info->params.flags & HDLC_FLAG_RXC_DPLL) 4417 val |= BIT6 + BIT5; /* 011, txclk = BRG/16 */ 4418 else 4419 val |= BIT6; /* 010, txclk = BRG */ 4420 } 4421 else if (info->params.flags & HDLC_FLAG_TXC_DPLL) 4422 val |= BIT7; /* 100, txclk = DPLL Input */ 4423 else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN) 4424 val |= BIT5; /* 001, txclk = RXC Input */ 4425 4426 if (info->params.flags & HDLC_FLAG_RXC_BRG) 4427 val |= BIT3; /* 010, rxclk = BRG */ 4428 else if (info->params.flags & HDLC_FLAG_RXC_DPLL) 4429 val |= BIT4; /* 100, rxclk = DPLL */ 4430 else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN) 4431 val |= BIT2; /* 001, rxclk = TXC Input */ 4432 4433 if (info->params.clock_speed) 4434 val |= BIT1 + BIT0; 4435 4436 wr_reg8(info, CCR, (unsigned char)val); 4437 4438 if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL)) 4439 { 4440 // program DPLL mode 4441 switch(info->params.encoding) 4442 { 4443 case HDLC_ENCODING_BIPHASE_MARK: 4444 case HDLC_ENCODING_BIPHASE_SPACE: 4445 val = BIT7; break; 4446 case HDLC_ENCODING_BIPHASE_LEVEL: 4447 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: 4448 val = BIT7 + BIT6; break; 4449 default: val = BIT6; // NRZ encodings 4450 } 4451 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val)); 4452 4453 // DPLL requires a 16X reference clock from BRG 4454 set_rate(info, info->params.clock_speed * 16); 4455 } 4456 else 4457 set_rate(info, info->params.clock_speed); 4458 4459 tx_set_idle(info); 4460 4461 msc_set_vcr(info); 4462 4463 /* SCR (serial control) 4464 * 4465 * 15 1=tx req on FIFO half empty 4466 * 14 1=rx req on FIFO half full 4467 * 13 tx data IRQ enable 4468 * 12 tx idle IRQ enable 4469 * 11 underrun IRQ enable 4470 * 10 rx data IRQ enable 4471 * 09 rx idle IRQ enable 4472 * 08 overrun IRQ enable 4473 * 07 DSR IRQ enable 4474 * 06 CTS IRQ enable 4475 * 05 DCD IRQ enable 4476 * 04 RI IRQ enable 4477 * 03 reserved, must be zero 4478 * 02 1=txd->rxd internal loopback enable 4479 * 01 reserved, must be zero 4480 * 00 1=master IRQ enable 4481 */ 4482 wr_reg16(info, SCR, BIT15 + BIT14 + BIT0); 4483 4484 if (info->params.loopback) 4485 enable_loopback(info); 4486 } 4487 4488 /* 4489 * set transmit idle mode 4490 */ 4491 static void tx_set_idle(struct slgt_info *info) 4492 { 4493 unsigned char val; 4494 unsigned short tcr; 4495 4496 /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits 4497 * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits 4498 */ 4499 tcr = rd_reg16(info, TCR); 4500 if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) { 4501 /* disable preamble, set idle size to 16 bits */ 4502 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4; 4503 /* MSB of 16 bit idle specified in tx preamble register (TPR) */ 4504 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff)); 4505 } else if (!(tcr & BIT6)) { 4506 /* preamble is disabled, set idle size to 8 bits */ 4507 tcr &= ~(BIT5 + BIT4); 4508 } 4509 wr_reg16(info, TCR, tcr); 4510 4511 if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) { 4512 /* LSB of custom tx idle specified in tx idle register */ 4513 val = (unsigned char)(info->idle_mode & 0xff); 4514 } else { 4515 /* standard 8 bit idle patterns */ 4516 switch(info->idle_mode) 4517 { 4518 case HDLC_TXIDLE_FLAGS: val = 0x7e; break; 4519 case HDLC_TXIDLE_ALT_ZEROS_ONES: 4520 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break; 4521 case HDLC_TXIDLE_ZEROS: 4522 case HDLC_TXIDLE_SPACE: val = 0x00; break; 4523 default: val = 0xff; 4524 } 4525 } 4526 4527 wr_reg8(info, TIR, val); 4528 } 4529 4530 /* 4531 * get state of V24 status (input) signals 4532 */ 4533 static void get_signals(struct slgt_info *info) 4534 { 4535 unsigned short status = rd_reg16(info, SSR); 4536 4537 /* clear all serial signals except DTR and RTS */ 4538 info->signals &= SerialSignal_DTR + SerialSignal_RTS; 4539 4540 if (status & BIT3) 4541 info->signals |= SerialSignal_DSR; 4542 if (status & BIT2) 4543 info->signals |= SerialSignal_CTS; 4544 if (status & BIT1) 4545 info->signals |= SerialSignal_DCD; 4546 if (status & BIT0) 4547 info->signals |= SerialSignal_RI; 4548 } 4549 4550 /* 4551 * set V.24 Control Register based on current configuration 4552 */ 4553 static void msc_set_vcr(struct slgt_info *info) 4554 { 4555 unsigned char val = 0; 4556 4557 /* VCR (V.24 control) 4558 * 4559 * 07..04 serial IF select 4560 * 03 DTR 4561 * 02 RTS 4562 * 01 LL 4563 * 00 RL 4564 */ 4565 4566 switch(info->if_mode & MGSL_INTERFACE_MASK) 4567 { 4568 case MGSL_INTERFACE_RS232: 4569 val |= BIT5; /* 0010 */ 4570 break; 4571 case MGSL_INTERFACE_V35: 4572 val |= BIT7 + BIT6 + BIT5; /* 1110 */ 4573 break; 4574 case MGSL_INTERFACE_RS422: 4575 val |= BIT6; /* 0100 */ 4576 break; 4577 } 4578 4579 if (info->if_mode & MGSL_INTERFACE_MSB_FIRST) 4580 val |= BIT4; 4581 if (info->signals & SerialSignal_DTR) 4582 val |= BIT3; 4583 if (info->signals & SerialSignal_RTS) 4584 val |= BIT2; 4585 if (info->if_mode & MGSL_INTERFACE_LL) 4586 val |= BIT1; 4587 if (info->if_mode & MGSL_INTERFACE_RL) 4588 val |= BIT0; 4589 wr_reg8(info, VCR, val); 4590 } 4591 4592 /* 4593 * set state of V24 control (output) signals 4594 */ 4595 static void set_signals(struct slgt_info *info) 4596 { 4597 unsigned char val = rd_reg8(info, VCR); 4598 if (info->signals & SerialSignal_DTR) 4599 val |= BIT3; 4600 else 4601 val &= ~BIT3; 4602 if (info->signals & SerialSignal_RTS) 4603 val |= BIT2; 4604 else 4605 val &= ~BIT2; 4606 wr_reg8(info, VCR, val); 4607 } 4608 4609 /* 4610 * free range of receive DMA buffers (i to last) 4611 */ 4612 static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last) 4613 { 4614 int done = 0; 4615 4616 while(!done) { 4617 /* reset current buffer for reuse */ 4618 info->rbufs[i].status = 0; 4619 set_desc_count(info->rbufs[i], info->rbuf_fill_level); 4620 if (i == last) 4621 done = 1; 4622 if (++i == info->rbuf_count) 4623 i = 0; 4624 } 4625 info->rbuf_current = i; 4626 } 4627 4628 /* 4629 * mark all receive DMA buffers as free 4630 */ 4631 static void reset_rbufs(struct slgt_info *info) 4632 { 4633 free_rbufs(info, 0, info->rbuf_count - 1); 4634 info->rbuf_fill_index = 0; 4635 info->rbuf_fill_count = 0; 4636 } 4637 4638 /* 4639 * pass receive HDLC frame to upper layer 4640 * 4641 * return true if frame available, otherwise false 4642 */ 4643 static bool rx_get_frame(struct slgt_info *info) 4644 { 4645 unsigned int start, end; 4646 unsigned short status; 4647 unsigned int framesize = 0; 4648 unsigned long flags; 4649 struct tty_struct *tty = info->port.tty; 4650 unsigned char addr_field = 0xff; 4651 unsigned int crc_size = 0; 4652 4653 switch (info->params.crc_type & HDLC_CRC_MASK) { 4654 case HDLC_CRC_16_CCITT: crc_size = 2; break; 4655 case HDLC_CRC_32_CCITT: crc_size = 4; break; 4656 } 4657 4658 check_again: 4659 4660 framesize = 0; 4661 addr_field = 0xff; 4662 start = end = info->rbuf_current; 4663 4664 for (;;) { 4665 if (!desc_complete(info->rbufs[end])) 4666 goto cleanup; 4667 4668 if (framesize == 0 && info->params.addr_filter != 0xff) 4669 addr_field = info->rbufs[end].buf[0]; 4670 4671 framesize += desc_count(info->rbufs[end]); 4672 4673 if (desc_eof(info->rbufs[end])) 4674 break; 4675 4676 if (++end == info->rbuf_count) 4677 end = 0; 4678 4679 if (end == info->rbuf_current) { 4680 if (info->rx_enabled){ 4681 spin_lock_irqsave(&info->lock,flags); 4682 rx_start(info); 4683 spin_unlock_irqrestore(&info->lock,flags); 4684 } 4685 goto cleanup; 4686 } 4687 } 4688 4689 /* status 4690 * 4691 * 15 buffer complete 4692 * 14..06 reserved 4693 * 05..04 residue 4694 * 02 eof (end of frame) 4695 * 01 CRC error 4696 * 00 abort 4697 */ 4698 status = desc_status(info->rbufs[end]); 4699 4700 /* ignore CRC bit if not using CRC (bit is undefined) */ 4701 if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE) 4702 status &= ~BIT1; 4703 4704 if (framesize == 0 || 4705 (addr_field != 0xff && addr_field != info->params.addr_filter)) { 4706 free_rbufs(info, start, end); 4707 goto check_again; 4708 } 4709 4710 if (framesize < (2 + crc_size) || status & BIT0) { 4711 info->icount.rxshort++; 4712 framesize = 0; 4713 } else if (status & BIT1) { 4714 info->icount.rxcrc++; 4715 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) 4716 framesize = 0; 4717 } 4718 4719 #if SYNCLINK_GENERIC_HDLC 4720 if (framesize == 0) { 4721 info->netdev->stats.rx_errors++; 4722 info->netdev->stats.rx_frame_errors++; 4723 } 4724 #endif 4725 4726 DBGBH(("%s rx frame status=%04X size=%d\n", 4727 info->device_name, status, framesize)); 4728 DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx"); 4729 4730 if (framesize) { 4731 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) { 4732 framesize -= crc_size; 4733 crc_size = 0; 4734 } 4735 4736 if (framesize > info->max_frame_size + crc_size) 4737 info->icount.rxlong++; 4738 else { 4739 /* copy dma buffer(s) to contiguous temp buffer */ 4740 int copy_count = framesize; 4741 int i = start; 4742 unsigned char *p = info->tmp_rbuf; 4743 info->tmp_rbuf_count = framesize; 4744 4745 info->icount.rxok++; 4746 4747 while(copy_count) { 4748 int partial_count = min_t(int, copy_count, info->rbuf_fill_level); 4749 memcpy(p, info->rbufs[i].buf, partial_count); 4750 p += partial_count; 4751 copy_count -= partial_count; 4752 if (++i == info->rbuf_count) 4753 i = 0; 4754 } 4755 4756 if (info->params.crc_type & HDLC_CRC_RETURN_EX) { 4757 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK; 4758 framesize++; 4759 } 4760 4761 #if SYNCLINK_GENERIC_HDLC 4762 if (info->netcount) 4763 hdlcdev_rx(info,info->tmp_rbuf, framesize); 4764 else 4765 #endif 4766 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize); 4767 } 4768 } 4769 free_rbufs(info, start, end); 4770 return true; 4771 4772 cleanup: 4773 return false; 4774 } 4775 4776 /* 4777 * pass receive buffer (RAW synchronous mode) to tty layer 4778 * return true if buffer available, otherwise false 4779 */ 4780 static bool rx_get_buf(struct slgt_info *info) 4781 { 4782 unsigned int i = info->rbuf_current; 4783 unsigned int count; 4784 4785 if (!desc_complete(info->rbufs[i])) 4786 return false; 4787 count = desc_count(info->rbufs[i]); 4788 switch(info->params.mode) { 4789 case MGSL_MODE_MONOSYNC: 4790 case MGSL_MODE_BISYNC: 4791 case MGSL_MODE_XSYNC: 4792 /* ignore residue in byte synchronous modes */ 4793 if (desc_residue(info->rbufs[i])) 4794 count--; 4795 break; 4796 } 4797 DBGDATA(info, info->rbufs[i].buf, count, "rx"); 4798 DBGINFO(("rx_get_buf size=%d\n", count)); 4799 if (count) 4800 ldisc_receive_buf(info->port.tty, info->rbufs[i].buf, 4801 info->flag_buf, count); 4802 free_rbufs(info, i, i); 4803 return true; 4804 } 4805 4806 static void reset_tbufs(struct slgt_info *info) 4807 { 4808 unsigned int i; 4809 info->tbuf_current = 0; 4810 for (i=0 ; i < info->tbuf_count ; i++) { 4811 info->tbufs[i].status = 0; 4812 info->tbufs[i].count = 0; 4813 } 4814 } 4815 4816 /* 4817 * return number of free transmit DMA buffers 4818 */ 4819 static unsigned int free_tbuf_count(struct slgt_info *info) 4820 { 4821 unsigned int count = 0; 4822 unsigned int i = info->tbuf_current; 4823 4824 do 4825 { 4826 if (desc_count(info->tbufs[i])) 4827 break; /* buffer in use */ 4828 ++count; 4829 if (++i == info->tbuf_count) 4830 i=0; 4831 } while (i != info->tbuf_current); 4832 4833 /* if tx DMA active, last zero count buffer is in use */ 4834 if (count && (rd_reg32(info, TDCSR) & BIT0)) 4835 --count; 4836 4837 return count; 4838 } 4839 4840 /* 4841 * return number of bytes in unsent transmit DMA buffers 4842 * and the serial controller tx FIFO 4843 */ 4844 static unsigned int tbuf_bytes(struct slgt_info *info) 4845 { 4846 unsigned int total_count = 0; 4847 unsigned int i = info->tbuf_current; 4848 unsigned int reg_value; 4849 unsigned int count; 4850 unsigned int active_buf_count = 0; 4851 4852 /* 4853 * Add descriptor counts for all tx DMA buffers. 4854 * If count is zero (cleared by DMA controller after read), 4855 * the buffer is complete or is actively being read from. 4856 * 4857 * Record buf_count of last buffer with zero count starting 4858 * from current ring position. buf_count is mirror 4859 * copy of count and is not cleared by serial controller. 4860 * If DMA controller is active, that buffer is actively 4861 * being read so add to total. 4862 */ 4863 do { 4864 count = desc_count(info->tbufs[i]); 4865 if (count) 4866 total_count += count; 4867 else if (!total_count) 4868 active_buf_count = info->tbufs[i].buf_count; 4869 if (++i == info->tbuf_count) 4870 i = 0; 4871 } while (i != info->tbuf_current); 4872 4873 /* read tx DMA status register */ 4874 reg_value = rd_reg32(info, TDCSR); 4875 4876 /* if tx DMA active, last zero count buffer is in use */ 4877 if (reg_value & BIT0) 4878 total_count += active_buf_count; 4879 4880 /* add tx FIFO count = reg_value[15..8] */ 4881 total_count += (reg_value >> 8) & 0xff; 4882 4883 /* if transmitter active add one byte for shift register */ 4884 if (info->tx_active) 4885 total_count++; 4886 4887 return total_count; 4888 } 4889 4890 /* 4891 * load data into transmit DMA buffer ring and start transmitter if needed 4892 * return true if data accepted, otherwise false (buffers full) 4893 */ 4894 static bool tx_load(struct slgt_info *info, const char *buf, unsigned int size) 4895 { 4896 unsigned short count; 4897 unsigned int i; 4898 struct slgt_desc *d; 4899 4900 /* check required buffer space */ 4901 if (DIV_ROUND_UP(size, DMABUFSIZE) > free_tbuf_count(info)) 4902 return false; 4903 4904 DBGDATA(info, buf, size, "tx"); 4905 4906 /* 4907 * copy data to one or more DMA buffers in circular ring 4908 * tbuf_start = first buffer for this data 4909 * tbuf_current = next free buffer 4910 * 4911 * Copy all data before making data visible to DMA controller by 4912 * setting descriptor count of the first buffer. 4913 * This prevents an active DMA controller from reading the first DMA 4914 * buffers of a frame and stopping before the final buffers are filled. 4915 */ 4916 4917 info->tbuf_start = i = info->tbuf_current; 4918 4919 while (size) { 4920 d = &info->tbufs[i]; 4921 4922 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size); 4923 memcpy(d->buf, buf, count); 4924 4925 size -= count; 4926 buf += count; 4927 4928 /* 4929 * set EOF bit for last buffer of HDLC frame or 4930 * for every buffer in raw mode 4931 */ 4932 if ((!size && info->params.mode == MGSL_MODE_HDLC) || 4933 info->params.mode == MGSL_MODE_RAW) 4934 set_desc_eof(*d, 1); 4935 else 4936 set_desc_eof(*d, 0); 4937 4938 /* set descriptor count for all but first buffer */ 4939 if (i != info->tbuf_start) 4940 set_desc_count(*d, count); 4941 d->buf_count = count; 4942 4943 if (++i == info->tbuf_count) 4944 i = 0; 4945 } 4946 4947 info->tbuf_current = i; 4948 4949 /* set first buffer count to make new data visible to DMA controller */ 4950 d = &info->tbufs[info->tbuf_start]; 4951 set_desc_count(*d, d->buf_count); 4952 4953 /* start transmitter if needed and update transmit timeout */ 4954 if (!info->tx_active) 4955 tx_start(info); 4956 update_tx_timer(info); 4957 4958 return true; 4959 } 4960 4961 static int register_test(struct slgt_info *info) 4962 { 4963 static unsigned short patterns[] = 4964 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696}; 4965 static unsigned int count = ARRAY_SIZE(patterns); 4966 unsigned int i; 4967 int rc = 0; 4968 4969 for (i=0 ; i < count ; i++) { 4970 wr_reg16(info, TIR, patterns[i]); 4971 wr_reg16(info, BDR, patterns[(i+1)%count]); 4972 if ((rd_reg16(info, TIR) != patterns[i]) || 4973 (rd_reg16(info, BDR) != patterns[(i+1)%count])) { 4974 rc = -ENODEV; 4975 break; 4976 } 4977 } 4978 info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0; 4979 info->init_error = rc ? 0 : DiagStatus_AddressFailure; 4980 return rc; 4981 } 4982 4983 static int irq_test(struct slgt_info *info) 4984 { 4985 unsigned long timeout; 4986 unsigned long flags; 4987 struct tty_struct *oldtty = info->port.tty; 4988 u32 speed = info->params.data_rate; 4989 4990 info->params.data_rate = 921600; 4991 info->port.tty = NULL; 4992 4993 spin_lock_irqsave(&info->lock, flags); 4994 async_mode(info); 4995 slgt_irq_on(info, IRQ_TXIDLE); 4996 4997 /* enable transmitter */ 4998 wr_reg16(info, TCR, 4999 (unsigned short)(rd_reg16(info, TCR) | BIT1)); 5000 5001 /* write one byte and wait for tx idle */ 5002 wr_reg16(info, TDR, 0); 5003 5004 /* assume failure */ 5005 info->init_error = DiagStatus_IrqFailure; 5006 info->irq_occurred = false; 5007 5008 spin_unlock_irqrestore(&info->lock, flags); 5009 5010 timeout=100; 5011 while(timeout-- && !info->irq_occurred) 5012 msleep_interruptible(10); 5013 5014 spin_lock_irqsave(&info->lock,flags); 5015 reset_port(info); 5016 spin_unlock_irqrestore(&info->lock,flags); 5017 5018 info->params.data_rate = speed; 5019 info->port.tty = oldtty; 5020 5021 info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure; 5022 return info->irq_occurred ? 0 : -ENODEV; 5023 } 5024 5025 static int loopback_test_rx(struct slgt_info *info) 5026 { 5027 unsigned char *src, *dest; 5028 int count; 5029 5030 if (desc_complete(info->rbufs[0])) { 5031 count = desc_count(info->rbufs[0]); 5032 src = info->rbufs[0].buf; 5033 dest = info->tmp_rbuf; 5034 5035 for( ; count ; count-=2, src+=2) { 5036 /* src=data byte (src+1)=status byte */ 5037 if (!(*(src+1) & (BIT9 + BIT8))) { 5038 *dest = *src; 5039 dest++; 5040 info->tmp_rbuf_count++; 5041 } 5042 } 5043 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx"); 5044 return 1; 5045 } 5046 return 0; 5047 } 5048 5049 static int loopback_test(struct slgt_info *info) 5050 { 5051 #define TESTFRAMESIZE 20 5052 5053 unsigned long timeout; 5054 u16 count = TESTFRAMESIZE; 5055 unsigned char buf[TESTFRAMESIZE]; 5056 int rc = -ENODEV; 5057 unsigned long flags; 5058 5059 struct tty_struct *oldtty = info->port.tty; 5060 MGSL_PARAMS params; 5061 5062 memcpy(¶ms, &info->params, sizeof(params)); 5063 5064 info->params.mode = MGSL_MODE_ASYNC; 5065 info->params.data_rate = 921600; 5066 info->params.loopback = 1; 5067 info->port.tty = NULL; 5068 5069 /* build and send transmit frame */ 5070 for (count = 0; count < TESTFRAMESIZE; ++count) 5071 buf[count] = (unsigned char)count; 5072 5073 info->tmp_rbuf_count = 0; 5074 memset(info->tmp_rbuf, 0, TESTFRAMESIZE); 5075 5076 /* program hardware for HDLC and enabled receiver */ 5077 spin_lock_irqsave(&info->lock,flags); 5078 async_mode(info); 5079 rx_start(info); 5080 tx_load(info, buf, count); 5081 spin_unlock_irqrestore(&info->lock, flags); 5082 5083 /* wait for receive complete */ 5084 for (timeout = 100; timeout; --timeout) { 5085 msleep_interruptible(10); 5086 if (loopback_test_rx(info)) { 5087 rc = 0; 5088 break; 5089 } 5090 } 5091 5092 /* verify received frame length and contents */ 5093 if (!rc && (info->tmp_rbuf_count != count || 5094 memcmp(buf, info->tmp_rbuf, count))) { 5095 rc = -ENODEV; 5096 } 5097 5098 spin_lock_irqsave(&info->lock,flags); 5099 reset_adapter(info); 5100 spin_unlock_irqrestore(&info->lock,flags); 5101 5102 memcpy(&info->params, ¶ms, sizeof(info->params)); 5103 info->port.tty = oldtty; 5104 5105 info->init_error = rc ? DiagStatus_DmaFailure : 0; 5106 return rc; 5107 } 5108 5109 static int adapter_test(struct slgt_info *info) 5110 { 5111 DBGINFO(("testing %s\n", info->device_name)); 5112 if (register_test(info) < 0) { 5113 printk("register test failure %s addr=%08X\n", 5114 info->device_name, info->phys_reg_addr); 5115 } else if (irq_test(info) < 0) { 5116 printk("IRQ test failure %s IRQ=%d\n", 5117 info->device_name, info->irq_level); 5118 } else if (loopback_test(info) < 0) { 5119 printk("loopback test failure %s\n", info->device_name); 5120 } 5121 return info->init_error; 5122 } 5123 5124 /* 5125 * transmit timeout handler 5126 */ 5127 static void tx_timeout(unsigned long context) 5128 { 5129 struct slgt_info *info = (struct slgt_info*)context; 5130 unsigned long flags; 5131 5132 DBGINFO(("%s tx_timeout\n", info->device_name)); 5133 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) { 5134 info->icount.txtimeout++; 5135 } 5136 spin_lock_irqsave(&info->lock,flags); 5137 tx_stop(info); 5138 spin_unlock_irqrestore(&info->lock,flags); 5139 5140 #if SYNCLINK_GENERIC_HDLC 5141 if (info->netcount) 5142 hdlcdev_tx_done(info); 5143 else 5144 #endif 5145 bh_transmit(info); 5146 } 5147 5148 /* 5149 * receive buffer polling timer 5150 */ 5151 static void rx_timeout(unsigned long context) 5152 { 5153 struct slgt_info *info = (struct slgt_info*)context; 5154 unsigned long flags; 5155 5156 DBGINFO(("%s rx_timeout\n", info->device_name)); 5157 spin_lock_irqsave(&info->lock, flags); 5158 info->pending_bh |= BH_RECEIVE; 5159 spin_unlock_irqrestore(&info->lock, flags); 5160 bh_handler(&info->task); 5161 } 5162 5163