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![Christophe Jaillet](/assets/img/avatar_default.png)
If one memory allocation fails, there is a memory leak. Signed-off-by: Christophe Jaillet <christophe.jaillet@wanadoo.fr> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
1228 lines
30 KiB
C
1228 lines
30 KiB
C
/*
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* 3215 line mode terminal driver.
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*
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* Copyright IBM Corp. 1999, 2009
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*
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* Updated:
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* Aug-2000: Added tab support
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* Dan Morrison, IBM Corporation <dmorriso@cse.buffalo.edu>
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kdev_t.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/vt_kern.h>
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#include <linux/init.h>
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#include <linux/console.h>
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#include <linux/interrupt.h>
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#include <linux/err.h>
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#include <linux/reboot.h>
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#include <linux/serial.h> /* ASYNC_* flags */
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#include <linux/slab.h>
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#include <asm/ccwdev.h>
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#include <asm/cio.h>
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#include <asm/io.h>
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#include <asm/ebcdic.h>
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#include <asm/uaccess.h>
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#include <asm/delay.h>
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#include <asm/cpcmd.h>
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#include <asm/setup.h>
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#include "ctrlchar.h"
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#define NR_3215 1
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#define NR_3215_REQ (4*NR_3215)
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#define RAW3215_BUFFER_SIZE 65536 /* output buffer size */
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#define RAW3215_INBUF_SIZE 256 /* input buffer size */
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#define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */
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#define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */
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#define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */
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#define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */
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#define RAW3215_NR_CCWS 3
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#define RAW3215_TIMEOUT HZ/10 /* time for delayed output */
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#define RAW3215_FIXED 1 /* 3215 console device is not be freed */
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#define RAW3215_WORKING 4 /* set if a request is being worked on */
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#define RAW3215_THROTTLED 8 /* set if reading is disabled */
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#define RAW3215_STOPPED 16 /* set if writing is disabled */
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#define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */
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#define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */
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#define TAB_STOP_SIZE 8 /* tab stop size */
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/*
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* Request types for a 3215 device
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*/
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enum raw3215_type {
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RAW3215_FREE, RAW3215_READ, RAW3215_WRITE
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};
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/*
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* Request structure for a 3215 device
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*/
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struct raw3215_req {
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enum raw3215_type type; /* type of the request */
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int start, len; /* start index & len in output buffer */
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int delayable; /* indication to wait for more data */
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int residual; /* residual count for read request */
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struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */
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struct raw3215_info *info; /* pointer to main structure */
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struct raw3215_req *next; /* pointer to next request */
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} __attribute__ ((aligned(8)));
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struct raw3215_info {
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struct tty_port port;
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struct ccw_device *cdev; /* device for tty driver */
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spinlock_t *lock; /* pointer to irq lock */
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int flags; /* state flags */
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char *buffer; /* pointer to output buffer */
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char *inbuf; /* pointer to input buffer */
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int head; /* first free byte in output buffer */
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int count; /* number of bytes in output buffer */
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int written; /* number of bytes in write requests */
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struct raw3215_req *queued_read; /* pointer to queued read requests */
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struct raw3215_req *queued_write;/* pointer to queued write requests */
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struct tasklet_struct tlet; /* tasklet to invoke tty_wakeup */
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wait_queue_head_t empty_wait; /* wait queue for flushing */
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struct timer_list timer; /* timer for delayed output */
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int line_pos; /* position on the line (for tabs) */
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char ubuffer[80]; /* copy_from_user buffer */
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};
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/* array of 3215 devices structures */
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static struct raw3215_info *raw3215[NR_3215];
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/* spinlock to protect the raw3215 array */
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static DEFINE_SPINLOCK(raw3215_device_lock);
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/* list of free request structures */
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static struct raw3215_req *raw3215_freelist;
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/* spinlock to protect free list */
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static spinlock_t raw3215_freelist_lock;
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static struct tty_driver *tty3215_driver;
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/*
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* Get a request structure from the free list
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*/
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static inline struct raw3215_req *raw3215_alloc_req(void)
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{
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struct raw3215_req *req;
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unsigned long flags;
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spin_lock_irqsave(&raw3215_freelist_lock, flags);
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req = raw3215_freelist;
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raw3215_freelist = req->next;
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spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
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return req;
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}
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/*
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* Put a request structure back to the free list
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*/
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static inline void raw3215_free_req(struct raw3215_req *req)
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{
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unsigned long flags;
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if (req->type == RAW3215_FREE)
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return; /* don't free a free request */
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req->type = RAW3215_FREE;
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spin_lock_irqsave(&raw3215_freelist_lock, flags);
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req->next = raw3215_freelist;
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raw3215_freelist = req;
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spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
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}
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/*
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* Set up a read request that reads up to 160 byte from the 3215 device.
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* If there is a queued read request it is used, but that shouldn't happen
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* because a 3215 terminal won't accept a new read before the old one is
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* completed.
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*/
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static void raw3215_mk_read_req(struct raw3215_info *raw)
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{
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struct raw3215_req *req;
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struct ccw1 *ccw;
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/* there can only be ONE read request at a time */
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req = raw->queued_read;
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if (req == NULL) {
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/* no queued read request, use new req structure */
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req = raw3215_alloc_req();
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req->type = RAW3215_READ;
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req->info = raw;
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raw->queued_read = req;
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}
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ccw = req->ccws;
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ccw->cmd_code = 0x0A; /* read inquiry */
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ccw->flags = 0x20; /* ignore incorrect length */
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ccw->count = 160;
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ccw->cda = (__u32) __pa(raw->inbuf);
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}
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/*
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* Set up a write request with the information from the main structure.
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* A ccw chain is created that writes as much as possible from the output
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* buffer to the 3215 device. If a queued write exists it is replaced by
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* the new, probably lengthened request.
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*/
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static void raw3215_mk_write_req(struct raw3215_info *raw)
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{
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struct raw3215_req *req;
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struct ccw1 *ccw;
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int len, count, ix, lines;
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if (raw->count <= raw->written)
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return;
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/* check if there is a queued write request */
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req = raw->queued_write;
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if (req == NULL) {
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/* no queued write request, use new req structure */
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req = raw3215_alloc_req();
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req->type = RAW3215_WRITE;
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req->info = raw;
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raw->queued_write = req;
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} else {
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raw->written -= req->len;
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}
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ccw = req->ccws;
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req->start = (raw->head - raw->count + raw->written) &
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(RAW3215_BUFFER_SIZE - 1);
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/*
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* now we have to count newlines. We can at max accept
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* RAW3215_MAX_NEWLINE newlines in a single ssch due to
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* a restriction in VM
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*/
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lines = 0;
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ix = req->start;
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while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) {
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if (raw->buffer[ix] == 0x15)
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lines++;
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ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
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}
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len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1;
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if (len > RAW3215_MAX_BYTES)
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len = RAW3215_MAX_BYTES;
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req->len = len;
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raw->written += len;
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/* set the indication if we should try to enlarge this request */
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req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE);
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ix = req->start;
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while (len > 0) {
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if (ccw > req->ccws)
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ccw[-1].flags |= 0x40; /* use command chaining */
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ccw->cmd_code = 0x01; /* write, auto carrier return */
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ccw->flags = 0x20; /* ignore incorrect length ind. */
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ccw->cda =
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(__u32) __pa(raw->buffer + ix);
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count = len;
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if (ix + count > RAW3215_BUFFER_SIZE)
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count = RAW3215_BUFFER_SIZE - ix;
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ccw->count = count;
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len -= count;
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ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1);
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ccw++;
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}
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/*
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* Add a NOP to the channel program. 3215 devices are purely
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* emulated and its much better to avoid the channel end
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* interrupt in this case.
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*/
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if (ccw > req->ccws)
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ccw[-1].flags |= 0x40; /* use command chaining */
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ccw->cmd_code = 0x03; /* NOP */
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ccw->flags = 0;
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ccw->cda = 0;
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ccw->count = 1;
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}
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/*
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* Start a read or a write request
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*/
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static void raw3215_start_io(struct raw3215_info *raw)
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{
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struct raw3215_req *req;
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int res;
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req = raw->queued_read;
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if (req != NULL &&
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!(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) {
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/* dequeue request */
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raw->queued_read = NULL;
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res = ccw_device_start(raw->cdev, req->ccws,
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(unsigned long) req, 0, 0);
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if (res != 0) {
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/* do_IO failed, put request back to queue */
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raw->queued_read = req;
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} else {
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raw->flags |= RAW3215_WORKING;
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}
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}
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req = raw->queued_write;
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if (req != NULL &&
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!(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) {
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/* dequeue request */
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raw->queued_write = NULL;
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res = ccw_device_start(raw->cdev, req->ccws,
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(unsigned long) req, 0, 0);
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if (res != 0) {
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/* do_IO failed, put request back to queue */
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raw->queued_write = req;
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} else {
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raw->flags |= RAW3215_WORKING;
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}
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}
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}
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/*
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* Function to start a delayed output after RAW3215_TIMEOUT seconds
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*/
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static void raw3215_timeout(unsigned long __data)
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{
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struct raw3215_info *raw = (struct raw3215_info *) __data;
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unsigned long flags;
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spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
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raw->flags &= ~RAW3215_TIMER_RUNS;
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if (!(raw->port.flags & ASYNC_SUSPENDED)) {
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raw3215_mk_write_req(raw);
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raw3215_start_io(raw);
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if ((raw->queued_read || raw->queued_write) &&
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!(raw->flags & RAW3215_WORKING) &&
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!(raw->flags & RAW3215_TIMER_RUNS)) {
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raw->timer.expires = RAW3215_TIMEOUT + jiffies;
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add_timer(&raw->timer);
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raw->flags |= RAW3215_TIMER_RUNS;
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}
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}
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spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
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}
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/*
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* Function to conditionally start an IO. A read is started immediately,
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* a write is only started immediately if the flush flag is on or the
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* amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
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* done immediately a timer is started with a delay of RAW3215_TIMEOUT.
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*/
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static inline void raw3215_try_io(struct raw3215_info *raw)
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{
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if (!(raw->port.flags & ASYNC_INITIALIZED) ||
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(raw->port.flags & ASYNC_SUSPENDED))
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return;
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if (raw->queued_read != NULL)
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raw3215_start_io(raw);
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else if (raw->queued_write != NULL) {
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if ((raw->queued_write->delayable == 0) ||
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(raw->flags & RAW3215_FLUSHING)) {
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/* execute write requests bigger than minimum size */
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raw3215_start_io(raw);
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}
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}
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if ((raw->queued_read || raw->queued_write) &&
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!(raw->flags & RAW3215_WORKING) &&
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!(raw->flags & RAW3215_TIMER_RUNS)) {
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raw->timer.expires = RAW3215_TIMEOUT + jiffies;
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add_timer(&raw->timer);
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raw->flags |= RAW3215_TIMER_RUNS;
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}
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}
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/*
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* Call tty_wakeup from tasklet context
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*/
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static void raw3215_wakeup(unsigned long data)
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{
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struct raw3215_info *raw = (struct raw3215_info *) data;
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struct tty_struct *tty;
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tty = tty_port_tty_get(&raw->port);
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if (tty) {
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tty_wakeup(tty);
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tty_kref_put(tty);
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}
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}
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/*
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* Try to start the next IO and wake up processes waiting on the tty.
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*/
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static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty)
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{
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raw3215_mk_write_req(raw);
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raw3215_try_io(raw);
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if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE)
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tasklet_schedule(&raw->tlet);
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}
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/*
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* Interrupt routine, called from common io layer
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*/
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static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,
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struct irb *irb)
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{
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struct raw3215_info *raw;
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struct raw3215_req *req;
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struct tty_struct *tty;
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int cstat, dstat;
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int count;
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raw = dev_get_drvdata(&cdev->dev);
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req = (struct raw3215_req *) intparm;
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tty = tty_port_tty_get(&raw->port);
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cstat = irb->scsw.cmd.cstat;
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dstat = irb->scsw.cmd.dstat;
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if (cstat != 0)
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raw3215_next_io(raw, tty);
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if (dstat & 0x01) { /* we got a unit exception */
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dstat &= ~0x01; /* we can ignore it */
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}
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switch (dstat) {
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case 0x80:
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if (cstat != 0)
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break;
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/* Attention interrupt, someone hit the enter key */
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raw3215_mk_read_req(raw);
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raw3215_next_io(raw, tty);
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break;
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case 0x08:
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case 0x0C:
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/* Channel end interrupt. */
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if ((raw = req->info) == NULL)
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goto put_tty; /* That shouldn't happen ... */
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if (req->type == RAW3215_READ) {
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/* store residual count, then wait for device end */
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req->residual = irb->scsw.cmd.count;
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}
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if (dstat == 0x08)
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break;
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case 0x04:
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/* Device end interrupt. */
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if ((raw = req->info) == NULL)
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goto put_tty; /* That shouldn't happen ... */
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if (req->type == RAW3215_READ && tty != NULL) {
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unsigned int cchar;
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count = 160 - req->residual;
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EBCASC(raw->inbuf, count);
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cchar = ctrlchar_handle(raw->inbuf, count, tty);
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switch (cchar & CTRLCHAR_MASK) {
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case CTRLCHAR_SYSRQ:
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break;
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case CTRLCHAR_CTRL:
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tty_insert_flip_char(&raw->port, cchar,
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TTY_NORMAL);
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tty_flip_buffer_push(&raw->port);
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break;
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case CTRLCHAR_NONE:
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if (count < 2 ||
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(strncmp(raw->inbuf+count-2, "\252n", 2) &&
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strncmp(raw->inbuf+count-2, "^n", 2)) ) {
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/* add the auto \n */
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raw->inbuf[count] = '\n';
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count++;
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} else
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count -= 2;
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tty_insert_flip_string(&raw->port, raw->inbuf,
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count);
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tty_flip_buffer_push(&raw->port);
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break;
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}
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} else if (req->type == RAW3215_WRITE) {
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raw->count -= req->len;
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raw->written -= req->len;
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}
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raw->flags &= ~RAW3215_WORKING;
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raw3215_free_req(req);
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/* check for empty wait */
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if (waitqueue_active(&raw->empty_wait) &&
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raw->queued_write == NULL &&
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raw->queued_read == NULL) {
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wake_up_interruptible(&raw->empty_wait);
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}
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raw3215_next_io(raw, tty);
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break;
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default:
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/* Strange interrupt, I'll do my best to clean up */
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if (req != NULL && req->type != RAW3215_FREE) {
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if (req->type == RAW3215_WRITE) {
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raw->count -= req->len;
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raw->written -= req->len;
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}
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raw->flags &= ~RAW3215_WORKING;
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raw3215_free_req(req);
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}
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raw3215_next_io(raw, tty);
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}
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put_tty:
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tty_kref_put(tty);
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}
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/*
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* Drop the oldest line from the output buffer.
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*/
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static void raw3215_drop_line(struct raw3215_info *raw)
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{
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int ix;
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char ch;
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BUG_ON(raw->written != 0);
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ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1);
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while (raw->count > 0) {
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ch = raw->buffer[ix];
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ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
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raw->count--;
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|
if (ch == 0x15)
|
|
break;
|
|
}
|
|
raw->head = ix;
|
|
}
|
|
|
|
/*
|
|
* Wait until length bytes are available int the output buffer.
|
|
* Has to be called with the s390irq lock held. Can be called
|
|
* disabled.
|
|
*/
|
|
static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
|
|
{
|
|
while (RAW3215_BUFFER_SIZE - raw->count < length) {
|
|
/* While console is frozen for suspend we have no other
|
|
* choice but to drop message from the buffer to make
|
|
* room for even more messages. */
|
|
if (raw->port.flags & ASYNC_SUSPENDED) {
|
|
raw3215_drop_line(raw);
|
|
continue;
|
|
}
|
|
/* there might be a request pending */
|
|
raw->flags |= RAW3215_FLUSHING;
|
|
raw3215_mk_write_req(raw);
|
|
raw3215_try_io(raw);
|
|
raw->flags &= ~RAW3215_FLUSHING;
|
|
#ifdef CONFIG_TN3215_CONSOLE
|
|
ccw_device_wait_idle(raw->cdev);
|
|
#endif
|
|
/* Enough room freed up ? */
|
|
if (RAW3215_BUFFER_SIZE - raw->count >= length)
|
|
break;
|
|
/* there might be another cpu waiting for the lock */
|
|
spin_unlock(get_ccwdev_lock(raw->cdev));
|
|
udelay(100);
|
|
spin_lock(get_ccwdev_lock(raw->cdev));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* String write routine for 3215 devices
|
|
*/
|
|
static void raw3215_write(struct raw3215_info *raw, const char *str,
|
|
unsigned int length)
|
|
{
|
|
unsigned long flags;
|
|
int c, count;
|
|
|
|
while (length > 0) {
|
|
spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
|
|
count = (length > RAW3215_BUFFER_SIZE) ?
|
|
RAW3215_BUFFER_SIZE : length;
|
|
length -= count;
|
|
|
|
raw3215_make_room(raw, count);
|
|
|
|
/* copy string to output buffer and convert it to EBCDIC */
|
|
while (1) {
|
|
c = min_t(int, count,
|
|
min(RAW3215_BUFFER_SIZE - raw->count,
|
|
RAW3215_BUFFER_SIZE - raw->head));
|
|
if (c <= 0)
|
|
break;
|
|
memcpy(raw->buffer + raw->head, str, c);
|
|
ASCEBC(raw->buffer + raw->head, c);
|
|
raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
|
|
raw->count += c;
|
|
raw->line_pos += c;
|
|
str += c;
|
|
count -= c;
|
|
}
|
|
if (!(raw->flags & RAW3215_WORKING)) {
|
|
raw3215_mk_write_req(raw);
|
|
/* start or queue request */
|
|
raw3215_try_io(raw);
|
|
}
|
|
spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Put character routine for 3215 devices
|
|
*/
|
|
static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
|
|
{
|
|
unsigned long flags;
|
|
unsigned int length, i;
|
|
|
|
spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
|
|
if (ch == '\t') {
|
|
length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
|
|
raw->line_pos += length;
|
|
ch = ' ';
|
|
} else if (ch == '\n') {
|
|
length = 1;
|
|
raw->line_pos = 0;
|
|
} else {
|
|
length = 1;
|
|
raw->line_pos++;
|
|
}
|
|
raw3215_make_room(raw, length);
|
|
|
|
for (i = 0; i < length; i++) {
|
|
raw->buffer[raw->head] = (char) _ascebc[(int) ch];
|
|
raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
|
|
raw->count++;
|
|
}
|
|
if (!(raw->flags & RAW3215_WORKING)) {
|
|
raw3215_mk_write_req(raw);
|
|
/* start or queue request */
|
|
raw3215_try_io(raw);
|
|
}
|
|
spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
|
|
}
|
|
|
|
/*
|
|
* Flush routine, it simply sets the flush flag and tries to start
|
|
* pending IO.
|
|
*/
|
|
static void raw3215_flush_buffer(struct raw3215_info *raw)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
|
|
if (raw->count > 0) {
|
|
raw->flags |= RAW3215_FLUSHING;
|
|
raw3215_try_io(raw);
|
|
raw->flags &= ~RAW3215_FLUSHING;
|
|
}
|
|
spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
|
|
}
|
|
|
|
/*
|
|
* Fire up a 3215 device.
|
|
*/
|
|
static int raw3215_startup(struct raw3215_info *raw)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (raw->port.flags & ASYNC_INITIALIZED)
|
|
return 0;
|
|
raw->line_pos = 0;
|
|
raw->port.flags |= ASYNC_INITIALIZED;
|
|
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 (!(raw->port.flags & ASYNC_INITIALIZED) ||
|
|
(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) {
|
|
raw->port.flags |= ASYNC_CLOSING;
|
|
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);
|
|
raw->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_CLOSING);
|
|
}
|
|
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;
|
|
}
|
|
|
|
setup_timer(&info->timer, raw3215_timeout, (unsigned long)info);
|
|
init_waitqueue_head(&info->empty_wait);
|
|
tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info);
|
|
tty_port_init(&info->port);
|
|
|
|
return info;
|
|
}
|
|
|
|
static void raw3215_free_info(struct raw3215_info *raw)
|
|
{
|
|
kfree(raw->inbuf);
|
|
kfree(raw->buffer);
|
|
tty_port_destroy(&raw->port);
|
|
kfree(raw);
|
|
}
|
|
|
|
static int raw3215_probe (struct ccw_device *cdev)
|
|
{
|
|
struct raw3215_info *raw;
|
|
int line;
|
|
|
|
/* Console is special. */
|
|
if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev)))
|
|
return 0;
|
|
|
|
raw = raw3215_alloc_info();
|
|
if (raw == NULL)
|
|
return -ENOMEM;
|
|
|
|
raw->cdev = cdev;
|
|
dev_set_drvdata(&cdev->dev, raw);
|
|
cdev->handler = raw3215_irq;
|
|
|
|
spin_lock(&raw3215_device_lock);
|
|
for (line = 0; line < NR_3215; line++) {
|
|
if (!raw3215[line]) {
|
|
raw3215[line] = raw;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&raw3215_device_lock);
|
|
if (line == NR_3215) {
|
|
raw3215_free_info(raw);
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void raw3215_remove (struct ccw_device *cdev)
|
|
{
|
|
struct raw3215_info *raw;
|
|
unsigned int line;
|
|
|
|
ccw_device_set_offline(cdev);
|
|
raw = dev_get_drvdata(&cdev->dev);
|
|
if (raw) {
|
|
spin_lock(&raw3215_device_lock);
|
|
for (line = 0; line < NR_3215; line++)
|
|
if (raw3215[line] == raw)
|
|
break;
|
|
raw3215[line] = NULL;
|
|
spin_unlock(&raw3215_device_lock);
|
|
dev_set_drvdata(&cdev->dev, NULL);
|
|
raw3215_free_info(raw);
|
|
}
|
|
}
|
|
|
|
static int raw3215_set_online (struct ccw_device *cdev)
|
|
{
|
|
struct raw3215_info *raw;
|
|
|
|
raw = dev_get_drvdata(&cdev->dev);
|
|
if (!raw)
|
|
return -ENODEV;
|
|
|
|
return raw3215_startup(raw);
|
|
}
|
|
|
|
static int raw3215_set_offline (struct ccw_device *cdev)
|
|
{
|
|
struct raw3215_info *raw;
|
|
|
|
raw = dev_get_drvdata(&cdev->dev);
|
|
if (!raw)
|
|
return -ENODEV;
|
|
|
|
raw3215_shutdown(raw);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int raw3215_pm_stop(struct ccw_device *cdev)
|
|
{
|
|
struct raw3215_info *raw;
|
|
unsigned long flags;
|
|
|
|
/* Empty the output buffer, then prevent new I/O. */
|
|
raw = dev_get_drvdata(&cdev->dev);
|
|
spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
|
|
raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
|
|
raw->port.flags |= ASYNC_SUSPENDED;
|
|
spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
|
|
return 0;
|
|
}
|
|
|
|
static int raw3215_pm_start(struct ccw_device *cdev)
|
|
{
|
|
struct raw3215_info *raw;
|
|
unsigned long flags;
|
|
|
|
/* Allow I/O again and flush output buffer. */
|
|
raw = dev_get_drvdata(&cdev->dev);
|
|
spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
|
|
raw->port.flags &= ~ASYNC_SUSPENDED;
|
|
raw->flags |= RAW3215_FLUSHING;
|
|
raw3215_try_io(raw);
|
|
raw->flags &= ~RAW3215_FLUSHING;
|
|
spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
|
|
return 0;
|
|
}
|
|
|
|
static struct ccw_device_id raw3215_id[] = {
|
|
{ CCW_DEVICE(0x3215, 0) },
|
|
{ /* end of list */ },
|
|
};
|
|
|
|
static struct ccw_driver raw3215_ccw_driver = {
|
|
.driver = {
|
|
.name = "3215",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.ids = raw3215_id,
|
|
.probe = &raw3215_probe,
|
|
.remove = &raw3215_remove,
|
|
.set_online = &raw3215_set_online,
|
|
.set_offline = &raw3215_set_offline,
|
|
.freeze = &raw3215_pm_stop,
|
|
.thaw = &raw3215_pm_start,
|
|
.restore = &raw3215_pm_start,
|
|
.int_class = IRQIO_C15,
|
|
};
|
|
|
|
#ifdef CONFIG_TN3215_CONSOLE
|
|
/*
|
|
* Write a string to the 3215 console
|
|
*/
|
|
static void con3215_write(struct console *co, const char *str,
|
|
unsigned int count)
|
|
{
|
|
struct raw3215_info *raw;
|
|
int i;
|
|
|
|
if (count <= 0)
|
|
return;
|
|
raw = raw3215[0]; /* console 3215 is the first one */
|
|
while (count > 0) {
|
|
for (i = 0; i < count; i++)
|
|
if (str[i] == '\t' || str[i] == '\n')
|
|
break;
|
|
raw3215_write(raw, str, i);
|
|
count -= i;
|
|
str += i;
|
|
if (count > 0) {
|
|
raw3215_putchar(raw, *str);
|
|
count--;
|
|
str++;
|
|
}
|
|
}
|
|
}
|
|
|
|
static struct tty_driver *con3215_device(struct console *c, int *index)
|
|
{
|
|
*index = c->index;
|
|
return tty3215_driver;
|
|
}
|
|
|
|
/*
|
|
* panic() calls con3215_flush through a panic_notifier
|
|
* before the system enters a disabled, endless loop.
|
|
*/
|
|
static void con3215_flush(void)
|
|
{
|
|
struct raw3215_info *raw;
|
|
unsigned long flags;
|
|
|
|
raw = raw3215[0]; /* console 3215 is the first one */
|
|
if (raw->port.flags & ASYNC_SUSPENDED)
|
|
/* The console is still frozen for suspend. */
|
|
if (ccw_device_force_console(raw->cdev))
|
|
/* Forcing didn't work, no panic message .. */
|
|
return;
|
|
spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
|
|
raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
|
|
}
|
|
|
|
static int con3215_notify(struct notifier_block *self,
|
|
unsigned long event, void *data)
|
|
{
|
|
con3215_flush();
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block on_panic_nb = {
|
|
.notifier_call = con3215_notify,
|
|
.priority = 0,
|
|
};
|
|
|
|
static struct notifier_block on_reboot_nb = {
|
|
.notifier_call = con3215_notify,
|
|
.priority = 0,
|
|
};
|
|
|
|
/*
|
|
* The console structure for the 3215 console
|
|
*/
|
|
static struct console con3215 = {
|
|
.name = "ttyS",
|
|
.write = con3215_write,
|
|
.device = con3215_device,
|
|
.flags = CON_PRINTBUFFER,
|
|
};
|
|
|
|
/*
|
|
* 3215 console initialization code called from console_init().
|
|
*/
|
|
static int __init con3215_init(void)
|
|
{
|
|
struct ccw_device *cdev;
|
|
struct raw3215_info *raw;
|
|
struct raw3215_req *req;
|
|
int i;
|
|
|
|
/* Check if 3215 is to be the console */
|
|
if (!CONSOLE_IS_3215)
|
|
return -ENODEV;
|
|
|
|
/* Set the console mode for VM */
|
|
if (MACHINE_IS_VM) {
|
|
cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
|
|
cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
|
|
}
|
|
|
|
/* allocate 3215 request structures */
|
|
raw3215_freelist = NULL;
|
|
spin_lock_init(&raw3215_freelist_lock);
|
|
for (i = 0; i < NR_3215_REQ; i++) {
|
|
req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA);
|
|
req->next = raw3215_freelist;
|
|
raw3215_freelist = req;
|
|
}
|
|
|
|
cdev = ccw_device_create_console(&raw3215_ccw_driver);
|
|
if (IS_ERR(cdev))
|
|
return -ENODEV;
|
|
|
|
raw3215[0] = raw = raw3215_alloc_info();
|
|
raw->cdev = cdev;
|
|
dev_set_drvdata(&cdev->dev, raw);
|
|
cdev->handler = raw3215_irq;
|
|
|
|
raw->flags |= RAW3215_FIXED;
|
|
if (ccw_device_enable_console(cdev)) {
|
|
ccw_device_destroy_console(cdev);
|
|
raw3215_free_info(raw);
|
|
raw3215[0] = NULL;
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Request the console irq */
|
|
if (raw3215_startup(raw) != 0) {
|
|
raw3215_free_info(raw);
|
|
raw3215[0] = NULL;
|
|
return -ENODEV;
|
|
}
|
|
atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
|
|
register_reboot_notifier(&on_reboot_nb);
|
|
register_console(&con3215);
|
|
return 0;
|
|
}
|
|
console_initcall(con3215_init);
|
|
#endif
|
|
|
|
static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty)
|
|
{
|
|
struct raw3215_info *raw;
|
|
|
|
raw = raw3215[tty->index];
|
|
if (raw == NULL)
|
|
return -ENODEV;
|
|
|
|
tty->driver_data = raw;
|
|
|
|
return tty_port_install(&raw->port, driver, tty);
|
|
}
|
|
|
|
/*
|
|
* tty3215_open
|
|
*
|
|
* This routine is called whenever a 3215 tty is opened.
|
|
*/
|
|
static int tty3215_open(struct tty_struct *tty, struct file * filp)
|
|
{
|
|
struct raw3215_info *raw = tty->driver_data;
|
|
int retval;
|
|
|
|
tty_port_tty_set(&raw->port, tty);
|
|
|
|
raw->port.low_latency = 0; /* don't use bottom half for pushing chars */
|
|
/*
|
|
* Start up 3215 device
|
|
*/
|
|
retval = raw3215_startup(raw);
|
|
if (retval)
|
|
return retval;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* tty3215_close()
|
|
*
|
|
* This routine is called when the 3215 tty is closed. We wait
|
|
* for the remaining request to be completed. Then we clean up.
|
|
*/
|
|
static void tty3215_close(struct tty_struct *tty, struct file * filp)
|
|
{
|
|
struct raw3215_info *raw;
|
|
|
|
raw = (struct raw3215_info *) tty->driver_data;
|
|
if (raw == NULL || tty->count > 1)
|
|
return;
|
|
tty->closing = 1;
|
|
/* Shutdown the terminal */
|
|
raw3215_shutdown(raw);
|
|
tasklet_kill(&raw->tlet);
|
|
tty->closing = 0;
|
|
tty_port_tty_set(&raw->port, NULL);
|
|
}
|
|
|
|
/*
|
|
* Returns the amount of free space in the output buffer.
|
|
*/
|
|
static int tty3215_write_room(struct tty_struct *tty)
|
|
{
|
|
struct raw3215_info *raw;
|
|
|
|
raw = (struct raw3215_info *) tty->driver_data;
|
|
|
|
/* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
|
|
if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
|
|
return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* String write routine for 3215 ttys
|
|
*/
|
|
static int tty3215_write(struct tty_struct * tty,
|
|
const unsigned char *buf, int count)
|
|
{
|
|
struct raw3215_info *raw;
|
|
int i, written;
|
|
|
|
if (!tty)
|
|
return 0;
|
|
raw = (struct raw3215_info *) tty->driver_data;
|
|
written = count;
|
|
while (count > 0) {
|
|
for (i = 0; i < count; i++)
|
|
if (buf[i] == '\t' || buf[i] == '\n')
|
|
break;
|
|
raw3215_write(raw, buf, i);
|
|
count -= i;
|
|
buf += i;
|
|
if (count > 0) {
|
|
raw3215_putchar(raw, *buf);
|
|
count--;
|
|
buf++;
|
|
}
|
|
}
|
|
return written;
|
|
}
|
|
|
|
/*
|
|
* Put character routine for 3215 ttys
|
|
*/
|
|
static int tty3215_put_char(struct tty_struct *tty, unsigned char ch)
|
|
{
|
|
struct raw3215_info *raw;
|
|
|
|
if (!tty)
|
|
return 0;
|
|
raw = (struct raw3215_info *) tty->driver_data;
|
|
raw3215_putchar(raw, ch);
|
|
return 1;
|
|
}
|
|
|
|
static void tty3215_flush_chars(struct tty_struct *tty)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Returns the number of characters in the output buffer
|
|
*/
|
|
static int tty3215_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
struct raw3215_info *raw;
|
|
|
|
raw = (struct raw3215_info *) tty->driver_data;
|
|
return raw->count;
|
|
}
|
|
|
|
static void tty3215_flush_buffer(struct tty_struct *tty)
|
|
{
|
|
struct raw3215_info *raw;
|
|
|
|
raw = (struct raw3215_info *) tty->driver_data;
|
|
raw3215_flush_buffer(raw);
|
|
tty_wakeup(tty);
|
|
}
|
|
|
|
/*
|
|
* Disable reading from a 3215 tty
|
|
*/
|
|
static void tty3215_throttle(struct tty_struct * tty)
|
|
{
|
|
struct raw3215_info *raw;
|
|
|
|
raw = (struct raw3215_info *) tty->driver_data;
|
|
raw->flags |= RAW3215_THROTTLED;
|
|
}
|
|
|
|
/*
|
|
* Enable reading from a 3215 tty
|
|
*/
|
|
static void tty3215_unthrottle(struct tty_struct * tty)
|
|
{
|
|
struct raw3215_info *raw;
|
|
unsigned long flags;
|
|
|
|
raw = (struct raw3215_info *) tty->driver_data;
|
|
if (raw->flags & RAW3215_THROTTLED) {
|
|
spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
|
|
raw->flags &= ~RAW3215_THROTTLED;
|
|
raw3215_try_io(raw);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Disable writing to a 3215 tty
|
|
*/
|
|
static void tty3215_stop(struct tty_struct *tty)
|
|
{
|
|
struct raw3215_info *raw;
|
|
|
|
raw = (struct raw3215_info *) tty->driver_data;
|
|
raw->flags |= RAW3215_STOPPED;
|
|
}
|
|
|
|
/*
|
|
* Enable writing to a 3215 tty
|
|
*/
|
|
static void tty3215_start(struct tty_struct *tty)
|
|
{
|
|
struct raw3215_info *raw;
|
|
unsigned long flags;
|
|
|
|
raw = (struct raw3215_info *) tty->driver_data;
|
|
if (raw->flags & RAW3215_STOPPED) {
|
|
spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
|
|
raw->flags &= ~RAW3215_STOPPED;
|
|
raw3215_try_io(raw);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
|
|
}
|
|
}
|
|
|
|
static const struct tty_operations tty3215_ops = {
|
|
.install = tty3215_install,
|
|
.open = tty3215_open,
|
|
.close = tty3215_close,
|
|
.write = tty3215_write,
|
|
.put_char = tty3215_put_char,
|
|
.flush_chars = tty3215_flush_chars,
|
|
.write_room = tty3215_write_room,
|
|
.chars_in_buffer = tty3215_chars_in_buffer,
|
|
.flush_buffer = tty3215_flush_buffer,
|
|
.throttle = tty3215_throttle,
|
|
.unthrottle = tty3215_unthrottle,
|
|
.stop = tty3215_stop,
|
|
.start = tty3215_start,
|
|
};
|
|
|
|
/*
|
|
* 3215 tty registration code called from tty_init().
|
|
* Most kernel services (incl. kmalloc) are available at this poimt.
|
|
*/
|
|
static int __init tty3215_init(void)
|
|
{
|
|
struct tty_driver *driver;
|
|
int ret;
|
|
|
|
if (!CONSOLE_IS_3215)
|
|
return 0;
|
|
|
|
driver = alloc_tty_driver(NR_3215);
|
|
if (!driver)
|
|
return -ENOMEM;
|
|
|
|
ret = ccw_driver_register(&raw3215_ccw_driver);
|
|
if (ret) {
|
|
put_tty_driver(driver);
|
|
return ret;
|
|
}
|
|
/*
|
|
* Initialize the tty_driver structure
|
|
* Entries in tty3215_driver that are NOT initialized:
|
|
* proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
|
|
*/
|
|
|
|
driver->driver_name = "tty3215";
|
|
driver->name = "ttyS";
|
|
driver->major = TTY_MAJOR;
|
|
driver->minor_start = 64;
|
|
driver->type = TTY_DRIVER_TYPE_SYSTEM;
|
|
driver->subtype = SYSTEM_TYPE_TTY;
|
|
driver->init_termios = tty_std_termios;
|
|
driver->init_termios.c_iflag = IGNBRK | IGNPAR;
|
|
driver->init_termios.c_oflag = ONLCR;
|
|
driver->init_termios.c_lflag = ISIG;
|
|
driver->flags = TTY_DRIVER_REAL_RAW;
|
|
tty_set_operations(driver, &tty3215_ops);
|
|
ret = tty_register_driver(driver);
|
|
if (ret) {
|
|
put_tty_driver(driver);
|
|
return ret;
|
|
}
|
|
tty3215_driver = driver;
|
|
return 0;
|
|
}
|
|
|
|
static void __exit tty3215_exit(void)
|
|
{
|
|
tty_unregister_driver(tty3215_driver);
|
|
put_tty_driver(tty3215_driver);
|
|
ccw_driver_unregister(&raw3215_ccw_driver);
|
|
}
|
|
|
|
module_init(tty3215_init);
|
|
module_exit(tty3215_exit);
|