con3215.c
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上传日期:2013-02-24
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文件大小:32k
- /*
- * 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 <linux/config.h>
- #include <linux/types.h>
- #include <linux/kdev_t.h>
- #include <linux/tty.h>
- #include <linux/vt_kern.h>
- #include <linux/init.h>
- #include <linux/console.h>
- #include <linux/interrupt.h>
- #include <linux/slab.h>
- #include <linux/bootmem.h>
- #include <linux/devfs_fs_kernel.h>
- #include <asm/io.h>
- #include <asm/ebcdic.h>
- #include <asm/uaccess.h>
- #include <asm/delay.h>
- #include <asm/cpcmd.h>
- #include <asm/irq.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_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 devicen");
- }
- #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 drivern");
- }