/* * drivers/s390/char/con3215.c * 3215 line mode terminal driver. * * S390 version * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), * * Updated: * Aug-2000: Added tab support * Dan Morrison, IBM Corporation (dmorriso@cse.buffalo.edu) */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ctrlchar.h" #define NR_3215 1 #define NR_3215_REQ (4*NR_3215) #define RAW3215_BUFFER_SIZE 65536 /* output buffer size */ #define RAW3215_INBUF_SIZE 256 /* input buffer size */ #define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */ #define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */ #define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */ #define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */ #define RAW3215_NR_CCWS 3 #define RAW3215_TIMEOUT HZ/10 /* time for delayed output */ #define RAW3215_FIXED 1 /* 3215 console device is not be freed */ #define RAW3215_ACTIVE 2 /* set if the device is in use */ #define RAW3215_WORKING 4 /* set if a request is being worked on */ #define RAW3215_THROTTLED 8 /* set if reading is disabled */ #define RAW3215_STOPPED 16 /* set if writing is disabled */ #define RAW3215_CLOSING 32 /* set while in close process */ #define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */ #define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */ #define RAW3215_BH_PENDING 256 /* indication for bh scheduling */ #define TAB_STOP_SIZE 8 /* tab stop size */ struct _raw3215_info; /* forward declaration ... */ int raw3215_condevice = -1; /* preset console device */ /* * Request types for a 3215 device */ typedef enum { RAW3215_FREE, RAW3215_READ, RAW3215_WRITE } raw3215_type; /* * Request structure for a 3215 device */ typedef struct _raw3215_req { raw3215_type type; /* type of the request */ int start, len; /* start index & len in output buffer */ int delayable; /* indication to wait for more data */ int residual; /* residual count for read request */ ccw1_t ccws[RAW3215_NR_CCWS]; /* space for the channel program */ struct _raw3215_info *info; /* pointer to main structure */ struct _raw3215_req *next; /* pointer to next request */ } raw3215_req __attribute__ ((aligned(8))); typedef struct _raw3215_info { int flags; /* state flags */ int irq; /* interrupt number to do_IO */ char *buffer; /* pointer to output buffer */ char *inbuf; /* pointer to input buffer */ int head; /* first free byte in output buffer */ int count; /* number of bytes in output buffer */ int written; /* number of bytes in write requests */ devstat_t devstat; /* device status structure for do_IO */ struct tty_struct *tty; /* pointer to tty structure if present */ struct tq_struct tqueue; /* task queue to bottom half */ raw3215_req *queued_read; /* pointer to queued read requests */ raw3215_req *queued_write; /* pointer to queued write requests */ wait_queue_head_t empty_wait; /* wait queue for flushing */ struct timer_list timer; /* timer for delayed output */ char *message; /* pending message from raw3215_irq */ int msg_dstat; /* dstat for pending message */ int msg_cstat; /* cstat for pending message */ int line_pos; /* position on the line (for tabs) */ } raw3215_info; static raw3215_info *raw3215[NR_3215]; /* array of 3215 devices structures */ static raw3215_req *raw3215_freelist; /* list of free request structures */ static spinlock_t raw3215_freelist_lock;/* spinlock to protect free list */ static struct tty_driver tty3215_driver; static struct tty_struct *tty3215_table[NR_3215]; static struct termios *tty3215_termios[NR_3215]; static struct termios *tty3215_termios_locked[NR_3215]; static int tty3215_refcount; #ifndef MIN #define MIN(a,b) ((a) < (b) ? (a) : (b)) #endif /* * Get a request structure from the free list */ extern inline raw3215_req *raw3215_alloc_req(void) { raw3215_req *req; unsigned long flags; spin_lock_irqsave(&raw3215_freelist_lock, flags); req = raw3215_freelist; raw3215_freelist = req->next; spin_unlock_irqrestore(&raw3215_freelist_lock, flags); return req; } /* * Put a request structure back to the free list */ extern inline void raw3215_free_req(raw3215_req *req) { unsigned long flags; if (req->type == RAW3215_FREE) return; /* don't free a free request */ req->type = RAW3215_FREE; spin_lock_irqsave(&raw3215_freelist_lock, flags); req->next = raw3215_freelist; raw3215_freelist = req; spin_unlock_irqrestore(&raw3215_freelist_lock, flags); } /* * Set up a read request that reads up to 160 byte from the 3215 device. * If there is a queued read request it is used, but that shouldn't happen * because a 3215 terminal won't accept a new read before the old one is * completed. */ static void raw3215_mk_read_req(raw3215_info *raw) { raw3215_req *req; ccw1_t *ccw; /* there can only be ONE read request at a time */ req = raw->queued_read; if (req == NULL) { /* no queued read request, use new req structure */ req = raw3215_alloc_req(); req->type = RAW3215_READ; req->info = raw; raw->queued_read = req; } ccw = req->ccws; ccw->cmd_code = 0x0A; /* read inquiry */ ccw->flags = 0x20; /* ignore incorrect length */ ccw->count = 160; ccw->cda = (__u32) __pa(raw->inbuf); } /* * Set up a write request with the information from the main structure. * A ccw chain is created that writes as much as possible from the output * buffer to the 3215 device. If a queued write exists it is replaced by * the new, probably lengthened request. */ static void raw3215_mk_write_req(raw3215_info *raw) { raw3215_req *req; ccw1_t *ccw; int len, count, ix, lines; if (raw->count <= raw->written) return; /* check if there is a queued write request */ req = raw->queued_write; if (req == NULL) { /* no queued write request, use new req structure */ req = raw3215_alloc_req(); req->type = RAW3215_WRITE; req->info = raw; raw->queued_write = req; } else { raw->written -= req->len; } ccw = req->ccws; req->start = (raw->head - raw->count + raw->written) & (RAW3215_BUFFER_SIZE - 1); /* * now we have to count newlines. We can at max accept * RAW3215_MAX_NEWLINE newlines in a single ssch due to * a restriction in VM */ lines = 0; ix = req->start; while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) { if (raw->buffer[ix] == 0x15) lines++; ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); } len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1; if (len > RAW3215_MAX_BYTES) len = RAW3215_MAX_BYTES; req->len = len; raw->written += len; /* set the indication if we should try to enlarge this request */ req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE); ix = req->start; while (len > 0) { if (ccw > req->ccws) ccw[-1].flags |= 0x40; /* use command chaining */ ccw->cmd_code = 0x01; /* write, auto carrier return */ ccw->flags = 0x20; /* ignore incorrect length ind. */ ccw->cda = (__u32) __pa(raw->buffer + ix); count = len; if (ix + count > RAW3215_BUFFER_SIZE) count = RAW3215_BUFFER_SIZE - ix; ccw->count = count; len -= count; ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1); ccw++; } /* * Add a NOP to the channel program. 3215 devices are purely * emulated and its much better to avoid the channel end * interrupt in this case. */ if (ccw > req->ccws) ccw[-1].flags |= 0x40; /* use command chaining */ ccw->cmd_code = 0x03; /* NOP */ ccw->flags = 0; ccw->cda = 0; ccw->count = 1; } /* * Start a read or a write request */ static void raw3215_start_io(raw3215_info *raw) { raw3215_req *req; int res; req = raw->queued_read; if (req != NULL && !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) { /* dequeue request */ raw->queued_read = NULL; res = do_IO(raw->irq, req->ccws, (unsigned long) req, 0, 0); if (res != 0) { /* do_IO failed, put request back to queue */ raw->queued_read = req; } else { raw->flags |= RAW3215_WORKING; } } req = raw->queued_write; if (req != NULL && !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) { /* dequeue request */ raw->queued_write = NULL; res = do_IO(raw->irq, req->ccws, (unsigned long) req, 0, 0); if (res != 0) { /* do_IO failed, put request back to queue */ raw->queued_write = req; } else { raw->flags |= RAW3215_WORKING; } } } /* * Function to start a delayed output after RAW3215_TIMEOUT seconds */ static void raw3215_timeout(unsigned long __data) { raw3215_info *raw = (raw3215_info *) __data; unsigned long flags; s390irq_spin_lock_irqsave(raw->irq, flags); if (raw->flags & RAW3215_TIMER_RUNS) { del_timer(&raw->timer); raw->flags &= ~RAW3215_TIMER_RUNS; raw3215_mk_write_req(raw); raw3215_start_io(raw); } s390irq_spin_unlock_irqrestore(raw->irq, flags); } /* * Function to conditionally start an IO. A read is started immediatly, * a write is only started immediatly if the flush flag is on or the * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not * done immediatly a timer is started with a delay of RAW3215_TIMEOUT. */ extern inline void raw3215_try_io(raw3215_info *raw) { if (!(raw->flags & RAW3215_ACTIVE)) return; if (raw->queued_read != NULL) raw3215_start_io(raw); else if (raw->queued_write != NULL) { if ((raw->queued_write->delayable == 0) || (raw->flags & RAW3215_FLUSHING)) { /* execute write requests bigger than minimum size */ raw3215_start_io(raw); if (raw->flags & RAW3215_TIMER_RUNS) { del_timer(&raw->timer); raw->flags &= ~RAW3215_TIMER_RUNS; } } else if (!(raw->flags & RAW3215_TIMER_RUNS)) { /* delay small writes */ init_timer(&raw->timer); raw->timer.expires = RAW3215_TIMEOUT + jiffies; raw->timer.data = (unsigned long) raw; raw->timer.function = raw3215_timeout; add_timer(&raw->timer); raw->flags |= RAW3215_TIMER_RUNS; } } } /* * The bottom half handler routine for 3215 devices. It tries to start * the next IO and wakes up processes waiting on the tty. */ static void raw3215_softint(void *data) { raw3215_info *raw; struct tty_struct *tty; unsigned long flags; raw = (raw3215_info *) data; s390irq_spin_lock_irqsave(raw->irq, flags); raw3215_mk_write_req(raw); raw3215_try_io(raw); raw->flags &= ~RAW3215_BH_PENDING; s390irq_spin_unlock_irqrestore(raw->irq, flags); /* Check for pending message from raw3215_irq */ if (raw->message != NULL) { printk(raw->message, raw->irq, raw->msg_dstat, raw->msg_cstat); raw->message = NULL; } tty = raw->tty; if (tty != NULL && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) { if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup) (tty->ldisc.write_wakeup)(tty); wake_up_interruptible(&tty->write_wait); } } /* * Function to safely add raw3215_softint to tq_immediate. * The s390irq spinlock must be held. */ static inline void raw3215_sched_bh(raw3215_info *raw) { if (raw->flags & RAW3215_BH_PENDING) return; /* already pending */ raw->flags |= RAW3215_BH_PENDING; INIT_LIST_HEAD(&raw->tqueue.list); raw->tqueue.sync = 0; raw->tqueue.routine = raw3215_softint; raw->tqueue.data = raw; queue_task(&raw->tqueue, &tq_immediate); mark_bh(IMMEDIATE_BH); } /* * Find the raw3215_info structure associated with irq */ static inline raw3215_info *raw3215_find_info(int irq) { raw3215_info *raw; int i; for (i = 0; i < NR_3215; i++) { raw = raw3215[i]; if (raw != NULL && raw->irq == irq && (raw->flags & RAW3215_ACTIVE)) break; } return (i >= NR_3215) ? NULL : raw; } /* * Interrupt routine, called from Ingo's I/O layer */ static void raw3215_irq(int irq, void *int_parm, struct pt_regs *regs) { raw3215_info *raw; raw3215_req *req; struct tty_struct *tty; devstat_t *stat; int cstat, dstat; int count, slen; stat = (devstat_t *) int_parm; req = (raw3215_req *) stat->intparm; cstat = stat->cstat; dstat = stat->dstat; if (cstat != 0) { raw = raw3215_find_info(irq); if (raw != NULL) { raw->message = KERN_WARNING "Got nonzero channel status in raw3215_irq " "(dev %i, dev sts 0x%2x, sch sts 0x%2x)"; raw->msg_dstat = dstat; raw->msg_cstat = cstat; raw3215_sched_bh(raw); } } if (dstat & 0x01) { /* we got a unit exception */ dstat &= ~0x01; /* we can ignore it */ } switch (dstat) { case 0x80: if (cstat != 0) break; /* Attention interrupt, someone hit the enter key */ if ((raw = raw3215_find_info(irq)) == NULL) return; /* That shouldn't happen ... */ /* Setup a read request */ raw3215_mk_read_req(raw); if (MACHINE_IS_P390) memset(raw->inbuf, 0, RAW3215_INBUF_SIZE); raw3215_sched_bh(raw); break; case 0x08: case 0x0C: /* Channel end interrupt. */ if ((raw = req->info) == NULL) return; /* That shouldn't happen ... */ if (req->type == RAW3215_READ) { /* store residual count, then wait for device end */ req->residual = stat->rescnt; } if (dstat == 0x08) break; case 0x04: /* Device end interrupt. */ if ((raw = req->info) == NULL) return; /* That shouldn't happen ... */ if (req->type == RAW3215_READ && raw->tty != NULL) { char *cchar; tty = raw->tty; count = 160 - req->residual; if (MACHINE_IS_P390) { slen = strnlen(raw->inbuf, RAW3215_INBUF_SIZE); if (count > slen) count = slen; } else if (count >= TTY_FLIPBUF_SIZE - tty->flip.count) count = TTY_FLIPBUF_SIZE - tty->flip.count - 1; EBCASC(raw->inbuf, count); if ((cchar = ctrlchar_handle(raw->inbuf, count, tty))) { if (cchar == (char *)-1) goto in_out; tty->flip.count++; *tty->flip.flag_buf_ptr++ = TTY_NORMAL; *tty->flip.char_buf_ptr++ = *cchar; tty_flip_buffer_push(raw->tty); } else { memcpy(tty->flip.char_buf_ptr, raw->inbuf, count); if (count < 2 || (strncmp(raw->inbuf+count-2, "^n", 2) || strncmp(raw->inbuf+count-2, "\252n", 2)) ) { /* don't add the auto \n */ tty->flip.char_buf_ptr[count] = '\n'; memset(tty->flip.flag_buf_ptr, TTY_NORMAL, count + 1); count++; } else count-=2; tty->flip.char_buf_ptr += count; tty->flip.flag_buf_ptr += count; tty->flip.count += count; tty_flip_buffer_push(raw->tty); } } else if (req->type == RAW3215_WRITE) { raw->count -= req->len; raw->written -= req->len; } in_out: raw->flags &= ~RAW3215_WORKING; raw3215_free_req(req); /* check for empty wait */ if (waitqueue_active(&raw->empty_wait) && raw->queued_write == NULL && raw->queued_read == NULL) { wake_up_interruptible(&raw->empty_wait); } raw3215_sched_bh(raw); break; default: /* Strange interrupt, I'll do my best to clean up */ if ((raw = raw3215_find_info(irq)) == NULL) return; /* That shouldn't happen ... */ if (raw == NULL) break; if (req != NULL && req->type != RAW3215_FREE) { if (req->type == RAW3215_WRITE) { raw->count -= req->len; raw->written -= req->len; } raw->flags &= ~RAW3215_WORKING; raw3215_free_req(req); } raw->message = KERN_WARNING "Spurious interrupt in in raw3215_irq " "(dev %i, dev sts 0x%2x, sch sts 0x%2x)"; raw->msg_dstat = dstat; raw->msg_cstat = cstat; raw3215_sched_bh(raw); } return; } /* * Wait until length bytes are available int the output buffer. * Has to be called with the s390irq lock held. Can be called * disabled. */ void raw3215_make_room(raw3215_info *raw, unsigned int length) { while (RAW3215_BUFFER_SIZE - raw->count < length) { /* there might be a request pending */ raw->flags |= RAW3215_FLUSHING; raw3215_mk_write_req(raw); raw3215_try_io(raw); raw->flags &= ~RAW3215_FLUSHING; if (wait_cons_dev(raw->irq) != 0) { /* that shouldn't happen */ raw->count = 0; raw->written = 0; } /* Enough room freed up ? */ if (RAW3215_BUFFER_SIZE - raw->count >= length) break; /* there might be another cpu waiting for the lock */ s390irq_spin_unlock(raw->irq); udelay(100); s390irq_spin_lock(raw->irq); } } /* * String write routine for 3215 devices */ static int raw3215_write(raw3215_info *raw, const char *str, int from_user, unsigned int length) { unsigned long flags; int ret, c; int count; ret = 0; while (length > 0) { s390irq_spin_lock_irqsave(raw->irq, flags); count = (length > RAW3215_BUFFER_SIZE) ? RAW3215_BUFFER_SIZE : length; length -= count; raw3215_make_room(raw, count); /* copy string to output buffer and convert it to EBCDIC */ if (from_user) { while (1) { c = MIN(count, MIN(RAW3215_BUFFER_SIZE - raw->count, RAW3215_BUFFER_SIZE - raw->head)); if (c <= 0) break; c -= copy_from_user(raw->buffer + raw->head, str, c); if (c == 0) { if (!ret) ret = -EFAULT; break; } ASCEBC(raw->buffer + raw->head, c); raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); raw->count += c; raw->line_pos += c; str += c; count -= c; ret += c; } } else { while (1) { c = MIN(count, MIN(RAW3215_BUFFER_SIZE - raw->count, RAW3215_BUFFER_SIZE - raw->head)); if (c <= 0) break; memcpy(raw->buffer + raw->head, str, c); ASCEBC(raw->buffer + raw->head, c); raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); raw->count += c; raw->line_pos += c; str += c; count -= c; ret += c; } } if (!(raw->flags & RAW3215_WORKING)) { raw3215_mk_write_req(raw); /* start or queue request */ raw3215_try_io(raw); } s390irq_spin_unlock_irqrestore(raw->irq, flags); } return ret; } /* * Put character routine for 3215 devices */ static void raw3215_putchar(raw3215_info *raw, unsigned char ch) { unsigned long flags; unsigned int length, i; s390irq_spin_lock_irqsave(raw->irq, flags); if (ch == '\t') { length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); raw->line_pos += length; ch = ' '; } else if (ch == '\n') { length = 1; raw->line_pos = 0; } else { length = 1; raw->line_pos++; } raw3215_make_room(raw, length); for (i = 0; i < length; i++) { raw->buffer[raw->head] = (char) _ascebc[(int) ch]; raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); raw->count++; } if (!(raw->flags & RAW3215_WORKING)) { raw3215_mk_write_req(raw); /* start or queue request */ raw3215_try_io(raw); } s390irq_spin_unlock_irqrestore(raw->irq, flags); } /* * Flush routine, it simply sets the flush flag and tries to start * pending IO. */ static void raw3215_flush_buffer(raw3215_info *raw) { unsigned long flags; s390irq_spin_lock_irqsave(raw->irq, flags); if (raw->count > 0) { raw->flags |= RAW3215_FLUSHING; raw3215_try_io(raw); raw->flags &= ~RAW3215_FLUSHING; } s390irq_spin_unlock_irqrestore(raw->irq, flags); } /* * Fire up a 3215 device. */ static int raw3215_startup(raw3215_info *raw) { unsigned long flags; if (raw->flags & RAW3215_ACTIVE) return 0; if (request_irq(raw->irq, raw3215_irq, SA_INTERRUPT, "3215 terminal driver", &raw->devstat) != 0) return -1; raw->line_pos = 0; raw->flags |= RAW3215_ACTIVE; s390irq_spin_lock_irqsave(raw->irq, flags); set_cons_dev(raw->irq); raw3215_try_io(raw); s390irq_spin_unlock_irqrestore(raw->irq, flags); return 0; } /* * Shutdown a 3215 device. */ static void raw3215_shutdown(raw3215_info *raw) { DECLARE_WAITQUEUE(wait, current); unsigned long flags; if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FIXED)) return; /* Wait for outstanding requests, then free irq */ s390irq_spin_lock_irqsave(raw->irq, flags); if ((raw->flags & RAW3215_WORKING) || raw->queued_write != NULL || raw->queued_read != NULL) { raw->flags |= RAW3215_CLOSING; add_wait_queue(&raw->empty_wait, &wait); current->state = TASK_INTERRUPTIBLE; s390irq_spin_unlock_irqrestore(raw->irq, flags); schedule(); s390irq_spin_lock_irqsave(raw->irq, flags); remove_wait_queue(&raw->empty_wait, &wait); current->state = TASK_RUNNING; raw->flags &= ~(RAW3215_ACTIVE | RAW3215_CLOSING); } free_irq(raw->irq, NULL); s390irq_spin_unlock_irqrestore(raw->irq, flags); } static int raw3215_find_dev(int number) { s390_dev_info_t dinfo; int irq; int count; irq = get_irq_first(); count = 0; while (count <= number && irq != -ENODEV) { if (get_dev_info(irq, &dinfo) == -ENODEV) break; if (dinfo.devno == console_device || dinfo.sid_data.cu_type == 0x3215) { count++; if (count > number) return irq; } irq = get_irq_next(irq); } return -1; /* console not found */ } #ifdef CONFIG_TN3215_CONSOLE /* * Write a string to the 3215 console */ static void con3215_write(struct console *co, const char *str, unsigned int count) { raw3215_info *raw; int i; if (count <= 0) return; raw = raw3215[0]; /* console 3215 is the first one */ while (count > 0) { for (i = 0; i < count; i++) if (str[i] == '\t' || str[i] == '\n') break; raw3215_write(raw, str, 0, i); count -= i; str += i; if (count > 0) { raw3215_putchar(raw, *str); count--; str++; } } } kdev_t con3215_device(struct console *c) { return MKDEV(TTY_MAJOR, c->index + 64 ); } /* * panic() calls console_unblank before the system enters a * disabled, endless loop. */ void con3215_unblank(void) { raw3215_info *raw; unsigned long flags; raw = raw3215[0]; /* console 3215 is the first one */ s390irq_spin_lock_irqsave(raw->irq, flags); raw3215_make_room(raw, RAW3215_BUFFER_SIZE); s390irq_spin_unlock_irqrestore(raw->irq, flags); } static int __init con3215_consetup(struct console *co, char *options) { return 0; } /* * The console structure for the 3215 console */ static struct console con3215 = { name: "tty3215", write: con3215_write, device: con3215_device, unblank: con3215_unblank, setup: con3215_consetup, flags: CON_PRINTBUFFER, }; #endif /* * tty3215_open * * This routine is called whenever a 3215 tty is opened. */ static int tty3215_open(struct tty_struct *tty, struct file * filp) { raw3215_info *raw; int retval, line; line = MINOR(tty->device) - tty->driver.minor_start; if ((line < 0) || (line >= NR_3215)) return -ENODEV; raw = raw3215[line]; if (raw == NULL) { raw = kmalloc(sizeof(raw3215_info) + RAW3215_INBUF_SIZE, GFP_KERNEL|GFP_DMA); if (raw == NULL) return -ENOMEM; raw->irq = raw3215_find_dev(line); if (raw->irq == -1) { kfree(raw); return -ENODEV; } raw->inbuf = (char *) raw + sizeof(raw3215_info); memset(raw, 0, sizeof(raw3215_info)); raw->buffer = (char *) kmalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL|GFP_DMA); if (raw->buffer == NULL) { kfree(raw); return -ENOMEM; } raw->tqueue.routine = raw3215_softint; raw->tqueue.data = raw; init_waitqueue_head(&raw->empty_wait); raw3215[line] = raw; } tty->driver_data = raw; raw->tty = tty; tty->low_latency = 0; /* don't use bottom half for pushing chars */ /* * Start up 3215 device */ retval = raw3215_startup(raw); if (retval) return retval; return 0; } /* * tty3215_close() * * This routine is called when the 3215 tty is closed. We wait * for the remaining request to be completed. Then we clean up. */ static void tty3215_close(struct tty_struct *tty, struct file * filp) { raw3215_info *raw; raw = (raw3215_info *) tty->driver_data; if (raw == NULL || tty->count > 1) return; tty->closing = 1; /* Shutdown the terminal */ raw3215_shutdown(raw); tty->closing = 0; raw->tty = NULL; } /* * Returns the amount of free space in the output buffer. */ static int tty3215_write_room(struct tty_struct *tty) { raw3215_info *raw; raw = (raw3215_info *) tty->driver_data; /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; else return 0; } /* * String write routine for 3215 ttys */ static int tty3215_write(struct tty_struct * tty, int from_user, const unsigned char *buf, int count) { raw3215_info *raw; int ret = 0; if (!tty) return 0; raw = (raw3215_info *) tty->driver_data; ret = raw3215_write(raw, buf, from_user, count); return ret; } /* * Put character routine for 3215 ttys */ static void tty3215_put_char(struct tty_struct *tty, unsigned char ch) { raw3215_info *raw; if (!tty) return; raw = (raw3215_info *) tty->driver_data; raw3215_putchar(raw, ch); } static void tty3215_flush_chars(struct tty_struct *tty) { } /* * Returns the number of characters in the output buffer */ static int tty3215_chars_in_buffer(struct tty_struct *tty) { raw3215_info *raw; raw = (raw3215_info *) tty->driver_data; return raw->count; } static void tty3215_flush_buffer(struct tty_struct *tty) { raw3215_info *raw; raw = (raw3215_info *) tty->driver_data; raw3215_flush_buffer(raw); wake_up_interruptible(&tty->write_wait); if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup) (tty->ldisc.write_wakeup)(tty); } /* * Currently we don't have any io controls for 3215 ttys */ static int tty3215_ioctl(struct tty_struct *tty, struct file * file, unsigned int cmd, unsigned long arg) { if (tty->flags & (1 << TTY_IO_ERROR)) return -EIO; switch (cmd) { default: return -ENOIOCTLCMD; } return 0; } /* * Disable reading from a 3215 tty */ static void tty3215_throttle(struct tty_struct * tty) { raw3215_info *raw; raw = (raw3215_info *) tty->driver_data; raw->flags |= RAW3215_THROTTLED; } /* * Enable reading from a 3215 tty */ static void tty3215_unthrottle(struct tty_struct * tty) { raw3215_info *raw; unsigned long flags; raw = (raw3215_info *) tty->driver_data; if (raw->flags & RAW3215_THROTTLED) { s390irq_spin_lock_irqsave(raw->irq, flags); raw->flags &= ~RAW3215_THROTTLED; raw3215_try_io(raw); s390irq_spin_unlock_irqrestore(raw->irq, flags); } } /* * Disable writing to a 3215 tty */ static void tty3215_stop(struct tty_struct *tty) { raw3215_info *raw; raw = (raw3215_info *) tty->driver_data; raw->flags |= RAW3215_STOPPED; } /* * Enable writing to a 3215 tty */ static void tty3215_start(struct tty_struct *tty) { raw3215_info *raw; unsigned long flags; raw = (raw3215_info *) tty->driver_data; if (raw->flags & RAW3215_STOPPED) { s390irq_spin_lock_irqsave(raw->irq, flags); raw->flags &= ~RAW3215_STOPPED; raw3215_try_io(raw); s390irq_spin_unlock_irqrestore(raw->irq, flags); } } /* * 3215 console initialization code called from console_init(). * NOTE: This is called before kmalloc is available. */ void __init con3215_init(void) { raw3215_info *raw; raw3215_req *req; int irq; int i; /* Check if 3215 is to be the console */ if (!CONSOLE_IS_3215) return; irq = raw3215_find_dev(0); /* Set the console mode for VM */ if (MACHINE_IS_VM) { cpcmd("TERM CONMODE 3215", NULL, 0); cpcmd("TERM AUTOCR OFF", NULL, 0); } /* allocate 3215 request structures */ raw3215_freelist = NULL; spin_lock_init(&raw3215_freelist_lock); for (i = 0; i < NR_3215_REQ; i++) { req = (raw3215_req *) alloc_bootmem_low(sizeof(raw3215_req)); req->next = raw3215_freelist; raw3215_freelist = req; } ctrlchar_init(); #ifdef CONFIG_TN3215_CONSOLE raw3215[0] = raw = (raw3215_info *) alloc_bootmem_low(sizeof(raw3215_info)); memset(raw, 0, sizeof(raw3215_info)); raw->buffer = (char *) alloc_bootmem_low(RAW3215_BUFFER_SIZE); raw->inbuf = (char *) alloc_bootmem_low(RAW3215_INBUF_SIZE); /* Find the first console */ raw->irq = raw3215_find_dev(0); raw->flags |= RAW3215_FIXED; raw->tqueue.routine = raw3215_softint; raw->tqueue.data = raw; init_waitqueue_head(&raw->empty_wait); /* Request the console irq */ if ( raw3215_startup(raw) != 0 ) raw->irq = -1; if (raw->irq != -1) { register_console(&con3215); } else { free_bootmem((unsigned long) raw->inbuf, RAW3215_INBUF_SIZE); free_bootmem((unsigned long) raw->buffer, RAW3215_BUFFER_SIZE); free_bootmem((unsigned long) raw, sizeof(raw3215_info)); raw3215[0] = NULL; printk("Couldn't find a 3215 console device\n"); } #endif } /* * 3215 tty registration code called from tty_init(). * Most kernel services (incl. kmalloc) are available at this poimt. */ void __init tty3215_init(void) { /* * Initialize the tty_driver structure * Entries in tty3215_driver that are NOT initialized: * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc */ memset(&tty3215_driver, 0, sizeof(struct tty_driver)); tty3215_driver.magic = TTY_DRIVER_MAGIC; tty3215_driver.driver_name = "tty3215"; tty3215_driver.name = "ttyS"; tty3215_driver.name_base = 0; tty3215_driver.major = TTY_MAJOR; tty3215_driver.minor_start = 64; tty3215_driver.num = NR_3215; tty3215_driver.type = TTY_DRIVER_TYPE_SYSTEM; tty3215_driver.subtype = SYSTEM_TYPE_TTY; tty3215_driver.init_termios = tty_std_termios; tty3215_driver.init_termios.c_iflag = IGNBRK | IGNPAR; tty3215_driver.init_termios.c_oflag = ONLCR | XTABS; tty3215_driver.init_termios.c_lflag = ISIG; tty3215_driver.flags = TTY_DRIVER_REAL_RAW; tty3215_driver.refcount = &tty3215_refcount; tty3215_driver.table = tty3215_table; tty3215_driver.termios = tty3215_termios; tty3215_driver.termios_locked = tty3215_termios_locked; tty3215_driver.open = tty3215_open; tty3215_driver.close = tty3215_close; tty3215_driver.write = tty3215_write; tty3215_driver.put_char = tty3215_put_char; tty3215_driver.flush_chars = tty3215_flush_chars; tty3215_driver.write_room = tty3215_write_room; tty3215_driver.chars_in_buffer = tty3215_chars_in_buffer; tty3215_driver.flush_buffer = tty3215_flush_buffer; tty3215_driver.ioctl = tty3215_ioctl; tty3215_driver.throttle = tty3215_throttle; tty3215_driver.unthrottle = tty3215_unthrottle; tty3215_driver.send_xchar = NULL; tty3215_driver.set_termios = NULL; tty3215_driver.stop = tty3215_stop; tty3215_driver.start = tty3215_start; tty3215_driver.hangup = NULL; tty3215_driver.break_ctl = NULL; tty3215_driver.wait_until_sent = NULL; tty3215_driver.read_proc = NULL; if (tty_register_driver(&tty3215_driver)) panic("Couldn't register tty3215 driver\n"); }