summaryrefslogtreecommitdiffstats
path: root/drivers/s390/char/con3215.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--drivers/s390/char/con3215.c1114
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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-11 12:28:48 +0000