diff options
Diffstat (limited to 'drivers/s390/char/con3215.c')
| -rw-r--r-- | drivers/s390/char/con3215.c | 1114 |
1 files changed, 1114 insertions, 0 deletions
diff --git a/drivers/s390/char/con3215.c b/drivers/s390/char/con3215.c new file mode 100644 index 000000000..4ae07c7e2 --- /dev/null +++ b/drivers/s390/char/con3215.c @@ -0,0 +1,1114 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 3215 line mode terminal driver. + * + * Copyright IBM Corp. 1999, 2009 + * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> + * + * Updated: + * Aug-2000: Added tab support + * Dan Morrison, IBM Corporation <dmorriso@cse.buffalo.edu> + */ + +#include <linux/types.h> +#include <linux/kdev_t.h> +#include <linux/tty.h> +#include <linux/tty_flip.h> +#include <linux/vt_kern.h> +#include <linux/init.h> +#include <linux/console.h> +#include <linux/interrupt.h> +#include <linux/err.h> +#include <linux/panic_notifier.h> +#include <linux/reboot.h> +#include <linux/serial.h> /* ASYNC_* flags */ +#include <linux/slab.h> +#include <asm/ccwdev.h> +#include <asm/cio.h> +#include <asm/io.h> +#include <asm/ebcdic.h> +#include <linux/uaccess.h> +#include <asm/delay.h> +#include <asm/cpcmd.h> +#include <asm/setup.h> + +#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 */ + 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 DEFINE_SPINLOCK(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; + 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)) + 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; + } +} + +/* + * 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) + tty_wakeup(tty); +} + +/* + * 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; + fallthrough; + 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); +} + +/* + * 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) { + /* 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); + 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 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, + .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; +} + +/* + * The below function is called as a panic/reboot notifier before the + * system enters a disabled, endless loop. + * + * Notice we must use the spin_trylock() alternative, to prevent lockups + * in atomic context (panic routine runs with secondary CPUs, local IRQs + * and preemption disabled). + */ +static int con3215_notify(struct notifier_block *self, + unsigned long event, void *data) +{ + struct raw3215_info *raw; + unsigned long flags; + + raw = raw3215[0]; /* console 3215 is the first one */ + if (!spin_trylock_irqsave(get_ccwdev_lock(raw->cdev), flags)) + return NOTIFY_DONE; + raw3215_make_room(raw, RAW3215_BUFFER_SIZE); + spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); + + return NOTIFY_DONE; +} + +static struct notifier_block on_panic_nb = { + .notifier_call = con3215_notify, + .priority = INT_MIN + 1, /* run the callback late */ +}; + +static struct notifier_block on_reboot_nb = { + .notifier_call = con3215_notify, + .priority = INT_MIN + 1, /* run the callback late */ +}; + +/* + * 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; + 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; + + tty_port_tty_set(&raw->port, tty); + + /* + * Start up 3215 device + */ + return raw3215_startup(raw); +} + +/* + * 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 = tty->driver_data; + + if (raw == NULL || tty->count > 1) + return; + tty->closing = 1; + /* Shutdown the terminal */ + raw3215_shutdown(raw); + tty->closing = 0; + tty_port_tty_set(&raw->port, NULL); +} + +/* + * Returns the amount of free space in the output buffer. + */ +static unsigned int tty3215_write_room(struct tty_struct *tty) +{ + struct raw3215_info *raw = 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 = tty->driver_data; + int i, written; + + 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 = 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 unsigned int tty3215_chars_in_buffer(struct tty_struct *tty) +{ + struct raw3215_info *raw = tty->driver_data; + + return raw->count; +} + +static void tty3215_flush_buffer(struct tty_struct *tty) +{ + struct raw3215_info *raw = 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 = 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 = tty->driver_data; + unsigned long flags; + + 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 = 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 = tty->driver_data; + unsigned long flags; + + 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 = tty_alloc_driver(NR_3215, TTY_DRIVER_REAL_RAW); + if (IS_ERR(driver)) + return PTR_ERR(driver); + + ret = ccw_driver_register(&raw3215_ccw_driver); + if (ret) { + tty_driver_kref_put(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; + tty_set_operations(driver, &tty3215_ops); + ret = tty_register_driver(driver); + if (ret) { + tty_driver_kref_put(driver); + return ret; + } + tty3215_driver = driver; + return 0; +} +device_initcall(tty3215_init); |