patch-2.3.99-pre8 linux/drivers/s390/char/con3215.c
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- Lines: 1130
- Date:
Fri May 12 11:41:44 2000
- Orig file:
v2.3.99-pre7/linux/drivers/s390/char/con3215.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.3.99-pre7/linux/drivers/s390/char/con3215.c linux/drivers/s390/char/con3215.c
@@ -0,0 +1,1129 @@
+/*
+ * 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),
+ */
+
+#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/malloc.h>
+#include <linux/bootmem.h>
+#include <asm/io.h>
+#include <asm/ebcdic.h>
+#include <asm/uaccess.h>
+
+#include "../../../arch/s390/kernel/cpcmd.h"
+#include <asm/irq.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_CCWLEN 3968 /* max. bytes to write with one ccw */
+#define RAW3215_NR_CCWS ((RAW3215_BUFFER_SIZE/RAW3215_MAX_CCWLEN)+2)
+#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 */
+
+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, end; /* start/end index into output buffer */
+ 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 */
+ 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 */
+} 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
+
+static int __init con3215_setup(char *str)
+{
+ int vdev;
+
+ vdev = simple_strtoul(str,&str,16);
+ if (vdev >= 0 && vdev < 65536)
+ raw3215_condevice = vdev;
+ return 1;
+}
+
+__setup("condev=", con3215_setup);
+
+/*
+ * 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);
+}
+
+/*
+ * Get a write request structure. That is either a new or the last
+ * queued write request. The request structure is set up in
+ * raw3215_mk_write_ccw.
+ */
+static raw3215_req *raw3215_mk_write_req(raw3215_info *raw)
+{
+ raw3215_req *req;
+
+ /* 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;
+ req->start = raw->head;
+ } else
+ raw->queued_write = NULL;
+ return req;
+}
+
+/*
+ * Get a read request structure. 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 raw3215_req *raw3215_mk_read_req(raw3215_info *raw)
+{
+ raw3215_req *req;
+
+ /* 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;
+ } else
+ raw->queued_read = NULL;
+ return req;
+}
+
+/*
+ * Set up a write request with the information from the main structure.
+ * A ccw chain is created that writes everything in the output buffer
+ * to the 3215 device.
+ */
+static int raw3215_mk_write_ccw(raw3215_info *raw, raw3215_req *req)
+{
+ ccw1_t *ccw;
+ int len, count, ix;
+
+ ccw = req->ccws;
+ req->end = (raw->head - 1) & (RAW3215_BUFFER_SIZE - 1);
+ len = ((req->end - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1;
+ 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 =
+ (void *) virt_to_phys(raw->buffer + ix);
+ count = (len > RAW3215_MAX_CCWLEN) ?
+ RAW3215_MAX_CCWLEN : 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++;
+ }
+ return len;
+}
+
+/*
+ * Set up a read request that reads up to 160 byte from the 3215 device.
+ */
+static void raw3215_mk_read_ccw(raw3215_info *raw, raw3215_req *req)
+{
+ ccw1_t *ccw;
+
+ ccw = req->ccws;
+ ccw->cmd_code = 0x0A; /* read inquiry */
+ ccw->flags = 0x20; /* ignore incorrect length */
+ ccw->count = 160;
+ ccw->cda = (void *) virt_to_phys(raw->inbuf);
+}
+
+/*
+ * 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, (__u32) 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, (__u32) 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_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->count >= RAW3215_MIN_WRITE ||
+ (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_try_io((raw3215_info *) data);
+ 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;
+ 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 */
+ req = raw3215_mk_read_req(raw);
+ raw3215_mk_read_ccw(raw, req);
+ raw->queued_read = req;
+ if (MACHINE_IS_P390)
+ memset(raw->inbuf, 0, RAW3215_INBUF_SIZE);
+ raw3215_sched_bh(raw);
+ break;
+ case 0x08:
+ case 0x0C:
+ /* Channel end interrupt. */
+ raw = req->info;
+ 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. */
+ raw = req->info;
+ if (req->type == RAW3215_READ && raw->tty != NULL) {
+ 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 (count == 2 && (
+ /* hat is 0xb0 in codepage 037 (US etc.) and thus */
+ /* converted to 0x5e in ascii ('^') */
+ strncmp(raw->inbuf, "^c", 2) == 0 ||
+ /* hat is 0xb0 in several other codepages (German,*/
+ /* UK, ...) and thus converted to ascii octal 252 */
+ strncmp(raw->inbuf, "\252c", 2) == 0) ) {
+ /* emulate a control C = break */
+ tty->flip.count++;
+ *tty->flip.flag_buf_ptr++ = TTY_NORMAL;
+ *tty->flip.char_buf_ptr++ = INTR_CHAR(tty);
+ tty_flip_buffer_push(raw->tty);
+ } else if (count == 2 && (
+ strncmp(raw->inbuf, "^d", 2) == 0 ||
+ strncmp(raw->inbuf, "\252d", 2) == 0) ) {
+ /* emulate a control D = end of file */
+ tty->flip.count++;
+ *tty->flip.flag_buf_ptr++ = TTY_NORMAL;
+ *tty->flip.char_buf_ptr++ = EOF_CHAR(tty);
+ tty_flip_buffer_push(raw->tty);
+ } else if (count == 2 && (
+ strncmp(raw->inbuf, "^z", 2) == 0 ||
+ strncmp(raw->inbuf, "\252z", 2) == 0) ) {
+ /* emulate a control Z = suspend */
+ tty->flip.count++;
+ *tty->flip.flag_buf_ptr++ = TTY_NORMAL;
+ *tty->flip.char_buf_ptr++ = SUSP_CHAR(tty);
+ 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->end - req->start) &
+ (RAW3215_BUFFER_SIZE - 1)) + 1;
+ }
+ 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->end - req->start) &
+ (RAW3215_BUFFER_SIZE-1))+1;
+ 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;
+}
+
+/*
+ * String write routine for 3215 devices
+ */
+static int
+raw3215_write(raw3215_info *raw, const char *str,
+ int from_user, unsigned int length)
+{
+ raw3215_req *req;
+ 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;
+
+ while (RAW3215_BUFFER_SIZE - raw->count < count) {
+ /* there might be a request pending */
+ raw3215_try_io(raw);
+ if (wait_cons_dev(raw->irq) != 0) {
+ /* that shouldn't happen */
+ raw->count = 0;
+ }
+ }
+
+ req = raw3215_mk_write_req(raw);
+ /* 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;
+ 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;
+ str += c;
+ count -= c;
+ ret += c;
+ }
+ }
+ raw3215_mk_write_ccw(raw, req);
+ raw->queued_write = req;
+ /* 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)
+{
+ raw3215_req *req;
+ unsigned long flags;
+
+ s390irq_spin_lock_irqsave(raw->irq, flags);
+ while (RAW3215_BUFFER_SIZE - raw->count < 1) {
+ /* there might be a request pending */
+ raw3215_try_io(raw);
+ if (wait_cons_dev(raw->irq) != 0) {
+ /* that shouldn't happen */
+ raw->count = 0;
+ }
+ }
+
+ req = raw3215_mk_write_req(raw);
+ raw->buffer[raw->head] = (char) _ascebc[(int) ch];
+ raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
+ raw->count++;
+ raw3215_mk_write_ccw(raw, req);
+ raw->queued_write = req;
+ /* 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->flags |= RAW3215_ACTIVE;
+ s390irq_spin_lock_irqsave(raw->irq, flags);
+ 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);
+ 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)
+{
+ 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 == raw3215_condevice ||
+ dinfo.sid_data.cu_type == 0x3215) {
+ count++;
+ if (count > number)
+ return irq;
+ }
+ irq = get_irq_next(irq);
+ }
+ return -1; /* console not found */
+}
+
+#ifdef CONFIG_3215_CONSOLE
+
+/*
+ * Try to request the console IRQ. Called from init/main.c
+ */
+int con3215_activate(void)
+{
+ raw3215_info *raw;
+
+ if (!MACHINE_IS_VM && !MACHINE_IS_P390)
+ return 0;
+ raw = raw3215[0]; /* 3215 console is the first one */
+ if (raw->irq == -1) /* now console device found in con3215_init */
+ return -1;
+ return raw3215_startup(raw);
+}
+
+/*
+ * Write a string to the 3215 console
+ */
+static void
+con3215_write(struct console *co, const char *str, unsigned int count)
+{
+ raw3215_info *raw;
+
+ if (count <= 0)
+ return;
+ raw = raw3215[0]; /* console 3215 is the first one */
+ raw3215_write(raw, str, 0, count);
+}
+
+kdev_t con3215_device(struct console *c)
+{
+ return MKDEV(TTY_MAJOR, c->index);
+}
+
+/*
+ * 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);
+ while (raw->count > 0) {
+ /* there might be a request pending */
+ raw->flags |= RAW3215_FLUSHING;
+ raw3215_try_io(raw);
+ if (wait_cons_dev(raw->irq) != 0) {
+ /* that shouldn't happen */
+ raw->count = 0;
+ }
+ raw->flags &= ~RAW3215_FLUSHING;
+ }
+ 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 = {
+ "tty3215",
+ con3215_write,
+ NULL,
+ con3215_device,
+ NULL,
+ con3215_unblank,
+ con3215_consetup,
+ CON_PRINTBUFFER,
+ 0,
+ 0,
+ NULL
+};
+
+#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);
+ 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);
+ if (raw->buffer == NULL) {
+ kfree_s(raw, sizeof(raw3215_info));
+ 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;
+ return RAW3215_BUFFER_SIZE - raw->count;
+}
+
+/*
+ * 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;
+
+ 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 driver boottime initialization code.
+ * Register console. We can't request the IRQ here, because
+ * it's too early (kmalloc isn't working yet). We'll have to
+ * buffer all the console requests until we can request the
+ * irq. For this purpose we use some pages of fixed memory.
+ */
+void __init con3215_init(void)
+{
+ raw3215_info *raw;
+ raw3215_req *req;
+ int i;
+
+ if (!MACHINE_IS_VM && !MACHINE_IS_P390)
+ return;
+ 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(sizeof(raw3215_req));
+ req->next = raw3215_freelist;
+ raw3215_freelist = req;
+ }
+
+#ifdef CONFIG_3215_CONSOLE
+ raw3215[0] = raw = (raw3215_info *)
+ alloc_bootmem(sizeof(raw3215_info));
+ memset(raw, 0, sizeof(raw3215_info));
+ raw->buffer = (char *) alloc_bootmem(RAW3215_BUFFER_SIZE);
+ raw->inbuf = (char *) alloc_bootmem(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);
+
+ if (raw->irq != -1) {
+ register_console(&con3215);
+ s390irq_spin_lock(raw->irq);
+ set_cons_dev(raw->irq);
+ s390irq_spin_unlock(raw->irq);
+ } 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
+
+ /*
+ * 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;
+ 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");
+
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)