// SPDX-License-Identifier: GPL-2.0 /* * 3215 line mode terminal driver. * * Copyright IBM Corp. 1999, 2009 * Author(s): Martin Schwidefsky * * Updated: * Aug-2000: Added tab support * Dan Morrison, IBM Corporation */ #include #include #include #include #include #include #include #include #include #include #include /* ASYNC_* flags */ #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_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_TIMER_RUNS 64 /* set if the output delay timer is on */ #define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */ #define TAB_STOP_SIZE 8 /* tab stop size */ /* * Request types for a 3215 device */ enum raw3215_type { RAW3215_FREE, RAW3215_READ, RAW3215_WRITE }; /* * Request structure for a 3215 device */ struct raw3215_req { enum 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 */ struct ccw1 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 */ } __attribute__ ((aligned(8))); struct raw3215_info { struct tty_port port; struct ccw_device *cdev; /* device for tty driver */ spinlock_t *lock; /* pointer to irq lock */ int flags; /* state flags */ 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 */ struct raw3215_req *queued_read; /* pointer to queued read requests */ struct raw3215_req *queued_write;/* pointer to queued write requests */ struct tasklet_struct tlet; /* tasklet to invoke tty_wakeup */ wait_queue_head_t empty_wait; /* wait queue for flushing */ struct timer_list timer; /* timer for delayed output */ int line_pos; /* position on the line (for tabs) */ char ubuffer[80]; /* copy_from_user buffer */ }; /* array of 3215 devices structures */ static struct raw3215_info *raw3215[NR_3215]; /* spinlock to protect the raw3215 array */ static DEFINE_SPINLOCK(raw3215_device_lock); /* list of free request structures */ static struct raw3215_req *raw3215_freelist; /* spinlock to protect free list */ static spinlock_t raw3215_freelist_lock; static struct tty_driver *tty3215_driver; /* * Get a request structure from the free list */ static inline struct raw3215_req *raw3215_alloc_req(void) { struct 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 */ static inline void raw3215_free_req(struct 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(struct raw3215_info *raw) { struct raw3215_req *req; struct ccw1 *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(struct raw3215_info *raw) { struct raw3215_req *req; struct ccw1 *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(struct raw3215_info *raw) { struct 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 = ccw_device_start(raw->cdev, 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 = ccw_device_start(raw->cdev, 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(struct timer_list *t) { struct raw3215_info *raw = from_timer(raw, t, timer); unsigned long flags; spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); raw->flags &= ~RAW3215_TIMER_RUNS; if (!tty_port_suspended(&raw->port)) { raw3215_mk_write_req(raw); raw3215_start_io(raw); if ((raw->queued_read || raw->queued_write) && !(raw->flags & RAW3215_WORKING) && !(raw->flags & RAW3215_TIMER_RUNS)) { raw->timer.expires = RAW3215_TIMEOUT + jiffies; add_timer(&raw->timer); raw->flags |= RAW3215_TIMER_RUNS; } } spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); } /* * Function to conditionally start an IO. A read is started immediately, * a write is only started immediately if the flush flag is on or the * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not * done immediately a timer is started with a delay of RAW3215_TIMEOUT. */ static inline void raw3215_try_io(struct raw3215_info *raw) { if (!tty_port_initialized(&raw->port) || tty_port_suspended(&raw->port)) 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->queued_read || raw->queued_write) && !(raw->flags & RAW3215_WORKING) && !(raw->flags & RAW3215_TIMER_RUNS)) { raw->timer.expires = RAW3215_TIMEOUT + jiffies; add_timer(&raw->timer); raw->flags |= RAW3215_TIMER_RUNS; } } /* * Call tty_wakeup from tasklet context */ static void raw3215_wakeup(unsigned long data) { struct raw3215_info *raw = (struct raw3215_info *) data; struct tty_struct *tty; tty = tty_port_tty_get(&raw->port); if (tty) { tty_wakeup(tty); tty_kref_put(tty); } } /* * Try to start the next IO and wake up processes waiting on the tty. */ static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty) { raw3215_mk_write_req(raw); raw3215_try_io(raw); if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) tasklet_schedule(&raw->tlet); } /* * Interrupt routine, called from common io layer */ static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) { struct raw3215_info *raw; struct raw3215_req *req; struct tty_struct *tty; int cstat, dstat; int count; raw = dev_get_drvdata(&cdev->dev); req = (struct raw3215_req *) intparm; tty = tty_port_tty_get(&raw->port); cstat = irb->scsw.cmd.cstat; dstat = irb->scsw.cmd.dstat; if (cstat != 0) raw3215_next_io(raw, tty); 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 */ raw3215_mk_read_req(raw); raw3215_next_io(raw, tty); break; case 0x08: case 0x0C: /* Channel end interrupt. */ if ((raw = req->info) == NULL) goto put_tty; /* That shouldn't happen ... */ if (req->type == RAW3215_READ) { /* store residual count, then wait for device end */ req->residual = irb->scsw.cmd.count; } if (dstat == 0x08) break; /* else, fall through */ case 0x04: /* Device end interrupt. */ if ((raw = req->info) == NULL) goto put_tty; /* That shouldn't happen ... */ if (req->type == RAW3215_READ && tty != NULL) { unsigned int cchar; count = 160 - req->residual; EBCASC(raw->inbuf, count); cchar = ctrlchar_handle(raw->inbuf, count, tty); switch (cchar & CTRLCHAR_MASK) { case CTRLCHAR_SYSRQ: break; case CTRLCHAR_CTRL: tty_insert_flip_char(&raw->port, cchar, TTY_NORMAL); tty_flip_buffer_push(&raw->port); break; case CTRLCHAR_NONE: if (count < 2 || (strncmp(raw->inbuf+count-2, "\252n", 2) && strncmp(raw->inbuf+count-2, "^n", 2)) ) { /* add the auto \n */ raw->inbuf[count] = '\n'; count++; } else count -= 2; tty_insert_flip_string(&raw->port, raw->inbuf, count); tty_flip_buffer_push(&raw->port); break; } } else if (req->type == RAW3215_WRITE) { raw->count -= req->len; raw->written -= req->len; } 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_next_io(raw, tty); break; default: /* Strange interrupt, I'll do my best to clean up */ 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); } raw3215_next_io(raw, tty); } put_tty: tty_kref_put(tty); } /* * Drop the oldest line from the output buffer. */ static void raw3215_drop_line(struct raw3215_info *raw) { int ix; char ch; BUG_ON(raw->written != 0); ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1); while (raw->count > 0) { ch = raw->buffer[ix]; ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); raw->count--; if (ch == 0x15) break; } raw->head = ix; } /* * Wait until length bytes are available int the output buffer. * Has to be called with the s390irq lock held. Can be called * disabled. */ static void raw3215_make_room(struct raw3215_info *raw, unsigned int length) { while (RAW3215_BUFFER_SIZE - raw->count < length) { /* While console is frozen for suspend we have no other * choice but to drop message from the buffer to make * room for even more messages. */ if (tty_port_suspended(&raw->port)) { raw3215_drop_line(raw); continue; } /* there might be a request pending */ raw->flags |= RAW3215_FLUSHING; raw3215_mk_write_req(raw); raw3215_try_io(raw); raw->flags &= ~RAW3215_FLUSHING; #ifdef CONFIG_TN3215_CONSOLE ccw_device_wait_idle(raw->cdev); #endif /* Enough room freed up ? */ if (RAW3215_BUFFER_SIZE - raw->count >= length) break; /* there might be another cpu waiting for the lock */ spin_unlock(get_ccwdev_lock(raw->cdev)); udelay(100); spin_lock(get_ccwdev_lock(raw->cdev)); } } /* * String write routine for 3215 devices */ static void raw3215_write(struct raw3215_info *raw, const char *str, unsigned int length) { unsigned long flags; int c, count; while (length > 0) { spin_lock_irqsave(get_ccwdev_lock(raw->cdev), 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 */ while (1) { c = min_t(int, 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; } if (!(raw->flags & RAW3215_WORKING)) { raw3215_mk_write_req(raw); /* start or queue request */ raw3215_try_io(raw); } spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); } } /* * Put character routine for 3215 devices */ static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch) { unsigned long flags; unsigned int length, i; spin_lock_irqsave(get_ccwdev_lock(raw->cdev), 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); } spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); } /* * Flush routine, it simply sets the flush flag and tries to start * pending IO. */ static void raw3215_flush_buffer(struct raw3215_info *raw) { unsigned long flags; spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); if (raw->count > 0) { raw->flags |= RAW3215_FLUSHING; raw3215_try_io(raw); raw->flags &= ~RAW3215_FLUSHING; } spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); } /* * Fire up a 3215 device. */ static int raw3215_startup(struct raw3215_info *raw) { unsigned long flags; if (tty_port_initialized(&raw->port)) return 0; raw->line_pos = 0; tty_port_set_initialized(&raw->port, 1); spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); raw3215_try_io(raw); spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); return 0; } /* * Shutdown a 3215 device. */ static void raw3215_shutdown(struct raw3215_info *raw) { DECLARE_WAITQUEUE(wait, current); unsigned long flags; if (!tty_port_initialized(&raw->port) || (raw->flags & RAW3215_FIXED)) return; /* Wait for outstanding requests, then free irq */ spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); if ((raw->flags & RAW3215_WORKING) || raw->queued_write != NULL || raw->queued_read != NULL) { add_wait_queue(&raw->empty_wait, &wait); set_current_state(TASK_INTERRUPTIBLE); spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); schedule(); spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); remove_wait_queue(&raw->empty_wait, &wait); set_current_state(TASK_RUNNING); tty_port_set_initialized(&raw->port, 1); } spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); } static struct raw3215_info *raw3215_alloc_info(void) { struct raw3215_info *info; info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA); if (!info) return NULL; info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA); info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA); if (!info->buffer || !info->inbuf) { kfree(info->inbuf); kfree(info->buffer); kfree(info); return NULL; } timer_setup(&info->timer, raw3215_timeout, 0); init_waitqueue_head(&info->empty_wait); tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info); tty_port_init(&info->port); return info; } static void raw3215_free_info(struct raw3215_info *raw) { kfree(raw->inbuf); kfree(raw->buffer); tty_port_destroy(&raw->port); kfree(raw); } static int raw3215_probe (struct ccw_device *cdev) { struct raw3215_info *raw; int line; /* Console is special. */ if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev))) return 0; raw = raw3215_alloc_info(); if (raw == NULL) return -ENOMEM; raw->cdev = cdev; dev_set_drvdata(&cdev->dev, raw); cdev->handler = raw3215_irq; spin_lock(&raw3215_device_lock); for (line = 0; line < NR_3215; line++) { if (!raw3215[line]) { raw3215[line] = raw; break; } } spin_unlock(&raw3215_device_lock); if (line == NR_3215) { raw3215_free_info(raw); return -ENODEV; } return 0; } static void raw3215_remove (struct ccw_device *cdev) { struct raw3215_info *raw; unsigned int line; ccw_device_set_offline(cdev); raw = dev_get_drvdata(&cdev->dev); if (raw) { spin_lock(&raw3215_device_lock); for (line = 0; line < NR_3215; line++) if (raw3215[line] == raw) break; raw3215[line] = NULL; spin_unlock(&raw3215_device_lock); dev_set_drvdata(&cdev->dev, NULL); raw3215_free_info(raw); } } static int raw3215_set_online (struct ccw_device *cdev) { struct raw3215_info *raw; raw = dev_get_drvdata(&cdev->dev); if (!raw) return -ENODEV; return raw3215_startup(raw); } static int raw3215_set_offline (struct ccw_device *cdev) { struct raw3215_info *raw; raw = dev_get_drvdata(&cdev->dev); if (!raw) return -ENODEV; raw3215_shutdown(raw); return 0; } static int raw3215_pm_stop(struct ccw_device *cdev) { struct raw3215_info *raw; unsigned long flags; /* Empty the output buffer, then prevent new I/O. */ raw = dev_get_drvdata(&cdev->dev); spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); raw3215_make_room(raw, RAW3215_BUFFER_SIZE); tty_port_set_suspended(&raw->port, 1); spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); return 0; } static int raw3215_pm_start(struct ccw_device *cdev) { struct raw3215_info *raw; unsigned long flags; /* Allow I/O again and flush output buffer. */ raw = dev_get_drvdata(&cdev->dev); spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); tty_port_set_suspended(&raw->port, 0); raw->flags |= RAW3215_FLUSHING; raw3215_try_io(raw); raw->flags &= ~RAW3215_FLUSHING; spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); return 0; } static struct ccw_device_id raw3215_id[] = { { CCW_DEVICE(0x3215, 0) }, { /* end of list */ }, }; static struct ccw_driver raw3215_ccw_driver = { .driver = { .name = "3215", .owner = THIS_MODULE, }, .ids = raw3215_id, .probe = &raw3215_probe, .remove = &raw3215_remove, .set_online = &raw3215_set_online, .set_offline = &raw3215_set_offline, .freeze = &raw3215_pm_stop, .thaw = &raw3215_pm_start, .restore = &raw3215_pm_start, .int_class = IRQIO_C15, }; #ifdef CONFIG_TN3215_CONSOLE /* * Write a string to the 3215 console */ static void con3215_write(struct console *co, const char *str, unsigned int count) { struct 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, i); count -= i; str += i; if (count > 0) { raw3215_putchar(raw, *str); count--; str++; } } } static struct tty_driver *con3215_device(struct console *c, int *index) { *index = c->index; return tty3215_driver; } /* * panic() calls con3215_flush through a panic_notifier * before the system enters a disabled, endless loop. */ static void con3215_flush(void) { struct raw3215_info *raw; unsigned long flags; raw = raw3215[0]; /* console 3215 is the first one */ if (tty_port_suspended(&raw->port)) /* The console is still frozen for suspend. */ if (ccw_device_force_console(raw->cdev)) /* Forcing didn't work, no panic message .. */ return; spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); raw3215_make_room(raw, RAW3215_BUFFER_SIZE); spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); } static int con3215_notify(struct notifier_block *self, unsigned long event, void *data) { con3215_flush(); return NOTIFY_OK; } static struct notifier_block on_panic_nb = { .notifier_call = con3215_notify, .priority = 0, }; static struct notifier_block on_reboot_nb = { .notifier_call = con3215_notify, .priority = 0, }; /* * The console structure for the 3215 console */ static struct console con3215 = { .name = "ttyS", .write = con3215_write, .device = con3215_device, .flags = CON_PRINTBUFFER, }; /* * 3215 console initialization code called from console_init(). */ static int __init con3215_init(void) { struct ccw_device *cdev; struct raw3215_info *raw; struct raw3215_req *req; int i; /* Check if 3215 is to be the console */ if (!CONSOLE_IS_3215) return -ENODEV; /* Set the console mode for VM */ if (MACHINE_IS_VM) { cpcmd("TERM CONMODE 3215", NULL, 0, NULL); cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); } /* allocate 3215 request structures */ raw3215_freelist = NULL; spin_lock_init(&raw3215_freelist_lock); for (i = 0; i < NR_3215_REQ; i++) { req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA); if (!req) return -ENOMEM; req->next = raw3215_freelist; raw3215_freelist = req; } cdev = ccw_device_create_console(&raw3215_ccw_driver); if (IS_ERR(cdev)) return -ENODEV; raw3215[0] = raw = raw3215_alloc_info(); raw->cdev = cdev; dev_set_drvdata(&cdev->dev, raw); cdev->handler = raw3215_irq; raw->flags |= RAW3215_FIXED; if (ccw_device_enable_console(cdev)) { ccw_device_destroy_console(cdev); raw3215_free_info(raw); raw3215[0] = NULL; return -ENODEV; } /* Request the console irq */ if (raw3215_startup(raw) != 0) { raw3215_free_info(raw); raw3215[0] = NULL; return -ENODEV; } atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); register_reboot_notifier(&on_reboot_nb); register_console(&con3215); return 0; } console_initcall(con3215_init); #endif static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty) { struct raw3215_info *raw; raw = raw3215[tty->index]; if (raw == NULL) return -ENODEV; tty->driver_data = raw; return tty_port_install(&raw->port, driver, tty); } /* * tty3215_open * * This routine is called whenever a 3215 tty is opened. */ static int tty3215_open(struct tty_struct *tty, struct file * filp) { struct raw3215_info *raw = tty->driver_data; int retval; tty_port_tty_set(&raw->port, tty); raw->port.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) { struct raw3215_info *raw; raw = (struct raw3215_info *) tty->driver_data; if (raw == NULL || tty->count > 1) return; tty->closing = 1; /* Shutdown the terminal */ raw3215_shutdown(raw); tasklet_kill(&raw->tlet); tty->closing = 0; tty_port_tty_set(&raw->port, NULL); } /* * Returns the amount of free space in the output buffer. */ static int tty3215_write_room(struct tty_struct *tty) { struct raw3215_info *raw; raw = (struct 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, const unsigned char *buf, int count) { struct raw3215_info *raw; int i, written; if (!tty) return 0; raw = (struct raw3215_info *) tty->driver_data; written = count; while (count > 0) { for (i = 0; i < count; i++) if (buf[i] == '\t' || buf[i] == '\n') break; raw3215_write(raw, buf, i); count -= i; buf += i; if (count > 0) { raw3215_putchar(raw, *buf); count--; buf++; } } return written; } /* * Put character routine for 3215 ttys */ static int tty3215_put_char(struct tty_struct *tty, unsigned char ch) { struct raw3215_info *raw; if (!tty) return 0; raw = (struct raw3215_info *) tty->driver_data; raw3215_putchar(raw, ch); return 1; } 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) { struct raw3215_info *raw; raw = (struct raw3215_info *) tty->driver_data; return raw->count; } static void tty3215_flush_buffer(struct tty_struct *tty) { struct raw3215_info *raw; raw = (struct raw3215_info *) tty->driver_data; raw3215_flush_buffer(raw); tty_wakeup(tty); } /* * Disable reading from a 3215 tty */ static void tty3215_throttle(struct tty_struct * tty) { struct raw3215_info *raw; raw = (struct raw3215_info *) tty->driver_data; raw->flags |= RAW3215_THROTTLED; } /* * Enable reading from a 3215 tty */ static void tty3215_unthrottle(struct tty_struct * tty) { struct raw3215_info *raw; unsigned long flags; raw = (struct raw3215_info *) tty->driver_data; if (raw->flags & RAW3215_THROTTLED) { spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); raw->flags &= ~RAW3215_THROTTLED; raw3215_try_io(raw); spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); } } /* * Disable writing to a 3215 tty */ static void tty3215_stop(struct tty_struct *tty) { struct raw3215_info *raw; raw = (struct raw3215_info *) tty->driver_data; raw->flags |= RAW3215_STOPPED; } /* * Enable writing to a 3215 tty */ static void tty3215_start(struct tty_struct *tty) { struct raw3215_info *raw; unsigned long flags; raw = (struct raw3215_info *) tty->driver_data; if (raw->flags & RAW3215_STOPPED) { spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); raw->flags &= ~RAW3215_STOPPED; raw3215_try_io(raw); spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); } } static const struct tty_operations tty3215_ops = { .install = tty3215_install, .open = tty3215_open, .close = tty3215_close, .write = tty3215_write, .put_char = tty3215_put_char, .flush_chars = tty3215_flush_chars, .write_room = tty3215_write_room, .chars_in_buffer = tty3215_chars_in_buffer, .flush_buffer = tty3215_flush_buffer, .throttle = tty3215_throttle, .unthrottle = tty3215_unthrottle, .stop = tty3215_stop, .start = tty3215_start, }; /* * 3215 tty registration code called from tty_init(). * Most kernel services (incl. kmalloc) are available at this poimt. */ static int __init tty3215_init(void) { struct tty_driver *driver; int ret; if (!CONSOLE_IS_3215) return 0; driver = alloc_tty_driver(NR_3215); if (!driver) return -ENOMEM; ret = ccw_driver_register(&raw3215_ccw_driver); if (ret) { put_tty_driver(driver); return ret; } /* * Initialize the tty_driver structure * Entries in tty3215_driver that are NOT initialized: * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc */ driver->driver_name = "tty3215"; driver->name = "ttyS"; driver->major = TTY_MAJOR; driver->minor_start = 64; driver->type = TTY_DRIVER_TYPE_SYSTEM; driver->subtype = SYSTEM_TYPE_TTY; driver->init_termios = tty_std_termios; driver->init_termios.c_iflag = IGNBRK | IGNPAR; driver->init_termios.c_oflag = ONLCR; driver->init_termios.c_lflag = ISIG; driver->flags = TTY_DRIVER_REAL_RAW; tty_set_operations(driver, &tty3215_ops); ret = tty_register_driver(driver); if (ret) { put_tty_driver(driver); return ret; } tty3215_driver = driver; return 0; } device_initcall(tty3215_init);