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/*
* IBM/3270 Driver -- Copyright (C) 2000 UTS Global LLC
*
* tuball.c -- Initialization, termination, irq lookup
*
*
*
*
*
* Author: Richard Hitt
*/
#include <linux/config.h>
#include "tubio.h"
#ifndef MODULE
#include <linux/init.h>
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,0))
#include <asm/cpcmd.h>
#include <linux/bootmem.h>
#else
#include "../../../../arch/s390/kernel/cpcmd.h"
#endif
#endif
/* Module parameters */
int tubdebug;
int tubscrolltime = -1;
int tubxcorrect = 1; /* Do correct ebc<->asc tables */
#ifdef MODULE
MODULE_PARM(tubdebug, "i");
MODULE_PARM(tubscrolltime, "i");
MODULE_PARM(tubxcorrect, "i");
#endif
/*
* Values for tubdebug and their effects:
* 1 - print in hex on console the first 16 bytes received
* 2 - print address at which array tubminors is allocated
* 4 - attempt to register tty3270_driver
*/
int tubnummins;
tub_t *(*tubminors)[TUBMAXMINS];
tub_t *(*(*tubirqs)[256])[256];
unsigned char tub_ascebc[256];
unsigned char tub_ebcasc[256];
int tubinitminors(void);
void tubfiniminors(void);
void tubint(int, void *, struct pt_regs *);
/* Lookup-by-irq functions */
int tubaddbyirq(tub_t *, int);
tub_t *tubfindbyirq(int);
void tubdelbyirq(tub_t *, int);
void tubfiniirqs(void);
extern int fs3270_init(void);
extern void fs3270_fini(void);
extern int tty3270_init(void);
extern void tty3270_fini(void);
unsigned char tub_ebcgraf[64] =
{ 0x40, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
0xc8, 0xc9, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
0x50, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
0xd8, 0xd9, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
0x60, 0x61, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
0xe8, 0xe9, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
0xf8, 0xf9, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f };
int tub3270_init(void);
#ifndef MODULE
/*
* Can't have this driver a module & support console at the same time
*/
#ifdef CONFIG_TN3270_CONSOLE
static kdev_t tub3270_con_device(struct console *);
static void tub3270_con_unblank(void);
static void tub3270_con_write(struct console *, const char *,
unsigned int);
static struct console tub3270_con = {
"tub3270", /* name */
tub3270_con_write, /* write */
NULL, /* read */
tub3270_con_device, /* device */
NULL, /* wait_key */
tub3270_con_unblank, /* unblank */
NULL, /* setup */
CON_PRINTBUFFER, /* flags */
0, /* index */
0, /* cflag */
NULL /* next */
};
static bcb_t tub3270_con_bcb; /* Buffer that receives con writes */
static spinlock_t tub3270_con_bcblock; /* Lock for the buffer */
int tub3270_con_irq = -1; /* set nonneg by _activate() */
tub_t *tub3270_con_tubp; /* set nonzero by _activate() */
struct tty_driver tty3270_con_driver; /* for /dev/console at 4, 64 */
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,3,0))
int tub3270_con_devno = -1; /* set by tub3270_con_setup() */
__initfunc(void tub3270_con_setup(char *str, int *ints))
{
int vdev;
vdev = simple_strtoul(str, 0, 16);
if (vdev >= 0 && vdev < 65536)
tub3270_con_devno = vdev;
return;
}
__initfunc (long tub3270_con_init(long kmem_start, long kmem_end))
{
tub3270_con_bcb.bc_len = 65536;
if (!MACHINE_IS_VM && !MACHINE_IS_P390)
return kmem_start;
tub3270_con_bcb.bc_buf = (void *)kmem_start;
kmem_start += tub3270_con_bcb.bc_len;
register_console(&tub3270_con);
return kmem_start;
}
#else
#define tub3270_con_devno console_device
void __init tub3270_con_init(void)
{
tub3270_con_bcb.bc_len = 65536;
if (!CONSOLE_IS_3270)
return;
tub3270_con_bcb.bc_buf = (void *)alloc_bootmem_low(
tub3270_con_bcb.bc_len);
register_console(&tub3270_con);
}
#endif
static kdev_t
tub3270_con_device(struct console *conp)
{
return MKDEV(IBM_TTY3270_MAJOR, conp->index + 1);
}
static void
tub3270_con_unblank(void)
{
/* flush everything: panic has occurred */
}
int tub3270_con_write_deadlock_ct;
int tub3270_con_write_deadlock_bytes;
static void
tub3270_con_write(struct console *conp,
const char *buf, unsigned int count)
{
long flags;
tub_t *tubp = tub3270_con_tubp;
void tty3270_sched_bh(tub_t *);
int rc;
bcb_t obcb;
obcb.bc_buf = (char *)buf;
obcb.bc_len = obcb.bc_cnt = obcb.bc_wr =
MIN(count, tub3270_con_bcb.bc_len);
obcb.bc_rd = 0;
spin_lock_irqsave(&tub3270_con_bcblock, flags);
rc = tub3270_movedata(&obcb, &tub3270_con_bcb, 0);
spin_unlock_irqrestore(&tub3270_con_bcblock, flags);
if (tubp && rc && TUBTRYLOCK(tubp->irq, flags)) {
tty3270_sched_bh(tubp);
TUBUNLOCK(tubp->irq, flags);
}
}
int tub3270_con_copy(tub_t *tubp)
{
long flags;
int rc;
spin_lock_irqsave(&tub3270_con_bcblock, flags);
rc = tub3270_movedata(&tub3270_con_bcb, &tubp->tty_bcb, 0);
spin_unlock_irqrestore(&tub3270_con_bcblock, flags);
return rc;
}
#endif /* CONFIG_TN3270_CONSOLE */
#else /* If generated as a MODULE */
/*
* module init: find tubes; get a major nbr
*/
int
init_module(void)
{
if (tubnummins != 0) {
printk(KERN_ERR "EEEK!! Tube driver cobbigling!!\n");
return -1;
}
return tub3270_init();
}
/*
* remove driver: unregister the major number
*/
void
cleanup_module(void)
{
fs3270_fini();
tty3270_fini();
tubfiniminors();
}
#endif /* Not a MODULE or a MODULE */
void
tub_inc_use_count(void)
{
MOD_INC_USE_COUNT;
}
void
tub_dec_use_count(void)
{
MOD_DEC_USE_COUNT;
}
/*
* tub3270_init() called by kernel or module initialization
*/
int
tub3270_init(void)
{
s390_dev_info_t d;
int i, rc;
/*
* Copy and correct ebcdic - ascii translate tables
*/
memcpy(tub_ascebc, _ascebc, sizeof tub_ascebc);
memcpy(tub_ebcasc, _ebcasc, sizeof tub_ebcasc);
if (tubxcorrect) {
/* correct brackets and circumflex */
tub_ascebc['['] = 0xad;
tub_ascebc[']'] = 0xbd;
tub_ebcasc[0xad] = '[';
tub_ebcasc[0xbd] = ']';
tub_ascebc['^'] = 0xb0;
tub_ebcasc[0x5f] = '^';
}
rc = tubinitminors();
if (rc != 0)
return rc;
if (fs3270_init() || tty3270_init()) {
printk(KERN_ERR "fs3270_init() or tty3270_init() failed\n");
fs3270_fini();
tty3270_fini();
tubfiniminors();
return -1;
}
for (i = get_irq_first(); i >= 0; i = get_irq_next(i)) {
if ((rc = get_dev_info_by_irq(i, &d)))
continue;
if (d.status)
continue;
#ifdef CONFIG_TN3270_CONSOLE
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,3,0))
if (d.sid_data.cu_type == 0x3215 && MACHINE_IS_VM) {
cpcmd("TERM CONMODE 3270", NULL, 0);
d.sid_data.cu_type = 0x3270;
}
#else
if (d.sid_data.cu_type == 0x3215 && CONSOLE_IS_3270) {
cpcmd("TERM CONMODE 3270", NULL, 0);
d.sid_data.cu_type = 0x3270;
}
#endif /* LINUX_VERSION_CODE */
#endif /* CONFIG_TN3270_CONSOLE */
if ((d.sid_data.cu_type & 0xfff0) != 0x3270)
continue;
rc = tubmakemin(i, &d);
if (rc < 0) {
printk(KERN_WARNING
"3270 tube registration ran out of memory"
" after %d devices\n", tubnummins - 1);
break;
} else {
printk(KERN_INFO "3270: %.4x on sch %d, minor %d\n",
d.devno, d.irq, rc);
}
}
return 0;
}
/*
* tub3270_movedata(bcb_t *, bcb_t *) -- Move data stream
*/
int
tub3270_movedata(bcb_t *ib, bcb_t *ob, int fromuser)
{
int count; /* Total move length */
int rc;
rc = count = MIN(ib->bc_cnt, ob->bc_len - ob->bc_cnt);
while (count > 0) {
int len1; /* Contig bytes avail in ib */
if (ib->bc_wr > ib->bc_rd)
len1 = ib->bc_wr - ib->bc_rd;
else
len1 = ib->bc_len - ib->bc_rd;
if (len1 > count)
len1 = count;
while (len1 > 0) {
int len2; /* Contig space avail in ob */
if (ob->bc_rd > ob->bc_wr)
len2 = ob->bc_rd - ob->bc_wr;
else
len2 = ob->bc_len - ob->bc_wr;
if (len2 > len1)
len2 = len1;
if (fromuser) {
len2 -= copy_from_user(ob->bc_buf + ob->bc_wr,
ib->bc_buf + ib->bc_rd,
len2);
if (len2 == 0) {
if (!rc)
rc = -EFAULT;
break;
}
} else
memcpy(ob->bc_buf + ob->bc_wr,
ib->bc_buf + ib->bc_rd,
len2);
ib->bc_rd += len2;
if (ib->bc_rd == ib->bc_len)
ib->bc_rd = 0;
ib->bc_cnt -= len2;
ob->bc_wr += len2;
if (ob->bc_wr == ob->bc_len)
ob->bc_wr = 0;
ob->bc_cnt += len2;
len1 -= len2;
count -= len2;
}
}
return rc;
}
/*
* receive an interrupt
*/
void
tubint(int irq, void *ipp, struct pt_regs *prp)
{
devstat_t *dsp = ipp;
tub_t *tubp;
if ((tubp = IRQ2TUB(irq)) && (tubp->intv))
(tubp->intv)(tubp, dsp);
}
/*
* Initialize array of pointers to minor structures tub_t.
* Returns 0 or -ENOMEM.
*/
int
tubinitminors(void)
{
tubminors = (tub_t *(*)[TUBMAXMINS])kmalloc(sizeof *tubminors,
GFP_KERNEL);
if (tubminors == NULL)
return -ENOMEM;
memset(tubminors, 0, sizeof *tubminors);
return 0;
}
/*
* Add a minor 327x device. Argument is an irq value.
*
* Point elements of two arrays to the newly created tub_t:
* 1. (*tubminors)[minor]
* 2. (*(*tubirqs)[irqhi])[irqlo]
* The first looks up from minor number at context time; the second
* looks up from irq at interrupt time.
*/
int
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,3,0))
tubmakemin(int irq, dev_info_t *dp)
#else
tubmakemin(int irq, s390_dev_info_t *dp)
#endif
{
tub_t *tubp;
int minor;
long flags;
if ((minor = ++tubnummins) == TUBMAXMINS)
return -ENODEV;
tubp = kmalloc(sizeof(tub_t), GFP_KERNEL);
if (tubp == NULL) {
return -ENOMEM;
}
if (tubaddbyirq(tubp, irq) != 0) {
kfree(tubp);
return -ENOMEM;
}
memset(tubp, 0, sizeof(tub_t));
tubp->minor = minor;
tubp->irq = irq;
TUBLOCK(tubp->irq, flags);
tubp->devno = dp->devno;
tubp->geom_rows = _GEOM_ROWS;
tubp->geom_cols = _GEOM_COLS;
init_waitqueue_head(&tubp->waitq);
tubp->tty_bcb.bc_len = TTY_OUTPUT_SIZE;
tubp->tty_bcb.bc_buf = (void *)kmalloc(tubp->tty_bcb.bc_len,
GFP_KERNEL|GFP_DMA);
if (tubp->tty_bcb.bc_buf == NULL) {
TUBUNLOCK(tubp->irq, flags);
tubdelbyirq(tubp, irq);
kfree(tubp);
return -ENOMEM;
}
tubp->tty_bcb.bc_cnt = 0;
tubp->tty_bcb.bc_wr = 0;
tubp->tty_bcb.bc_rd = 0;
(*tubminors)[minor] = tubp;
#ifdef CONFIG_TN3270_CONSOLE
if (CONSOLE_IS_3270) {
if (tub3270_con_tubp == NULL &&
tub3270_con_bcb.bc_buf != NULL &&
(tub3270_con_devno == -1 ||
tub3270_con_devno == dp->devno)) {
extern void tty3270_int(tub_t *, devstat_t *);
tub3270_con_devno = dp->devno;
tubp->cmd = TBC_CONOPEN;
tubp->flags |= TUB_OPEN_STET | TUB_INPUT_HACK;
tty3270_size(tubp, &flags);
tty3270_aid_init(tubp);
tty3270_scl_init(tubp);
tub3270_con_irq = tubp->irq;
tub3270_con_tubp = tubp;
tubp->intv = tty3270_int;
tubp->cmd = TBC_UPDSTAT;
tty3270_build(tubp);
}
}
#endif /* CONFIG_TN3270_CONSOLE */
#ifdef CONFIG_DEVFS_FS
fs3270_devfs_register(tubp);
#endif
TUBUNLOCK(tubp->irq, flags);
return minor;
}
/*
* Release array of pointers to minor structures tub_t, but first
* release any storage pointed to by them.
*/
void
tubfiniminors(void)
{
int i;
tub_t **tubpp, *tubp;
if (tubminors == NULL)
return;
for (i = 0; i < TUBMAXMINS; i++) {
tubpp = &(*tubminors)[i];
if ((tubp = *tubpp)) {
#ifdef CONFIG_DEVFS_FS
fs3270_devfs_unregister(tubp);
#endif
tubdelbyirq(tubp, tubp->irq);
tty3270_rcl_fini(tubp);
kfree(tubp->tty_bcb.bc_buf);
tubp->tty_bcb.bc_buf = NULL;
tubp->ttyscreen = NULL;
kfree(tubp);
*tubpp = NULL;
}
}
kfree(tubminors);
tubminors = NULL;
tubfiniirqs();
}
/*
* tubaddbyirq() -- Add tub_t for irq lookup in tubint()
*/
int
tubaddbyirq(tub_t *tubp, int irq)
{
int irqhi = (irq >> 8) & 255;
int irqlo = irq & 255;
tub_t *(*itubpp)[256];
/* Allocate array (*tubirqs)[] if first time */
if (tubirqs == NULL) {
tubirqs = (tub_t *(*(*)[256])[256])
kmalloc(sizeof *tubirqs, GFP_KERNEL);
if (tubirqs == NULL)
return -ENOMEM;
memset(tubirqs, 0, sizeof *tubirqs);
}
/* Allocate subarray (*(*tubirqs)[])[] if first use */
if ((itubpp = (*tubirqs)[irqhi]) == NULL) {
itubpp = (tub_t *(*)[256])
kmalloc(sizeof(*itubpp), GFP_KERNEL);
if (itubpp == NULL) {
if (tubnummins == 1) { /* if first time */
kfree(tubirqs);
tubirqs = NULL;
}
return -ENOMEM;
} else {
memset(itubpp, 0, sizeof(*itubpp));
(*tubirqs)[irqhi] = itubpp;
}
}
/* Request interrupt service */
if ((tubp->irqrc = request_irq(irq, tubint, SA_INTERRUPT,
"3270 tube driver", &tubp->devstat)) != 0)
return tubp->irqrc;
/* Fill in the proper subarray element */
(*itubpp)[irqlo] = tubp;
return 0;
}
/*
* tubfindbyirq(irq)
*/
tub_t *
tubfindbyirq(int irq)
{
int irqhi = (irq >> 8) & 255;
int irqlo = irq & 255;
tub_t *tubp;
if (tubirqs == NULL)
return NULL;
if ((*tubirqs)[irqhi] == NULL)
return NULL;
tubp = (*(*tubirqs)[irqhi])[irqlo];
if (tubp->irq == irq)
return tubp;
return NULL;
}
/*
* tubdelbyirq(tub_t*, irq)
*/
void
tubdelbyirq(tub_t *tubp, int irq)
{
int irqhi = (irq >> 8) & 255;
int irqlo = irq & 255;
tub_t *(*itubpp)[256], *itubp;
if (tubirqs == NULL) {
printk(KERN_ERR "tubirqs is NULL\n");
return;
}
itubpp = (*tubirqs)[irqhi];
if (itubpp == NULL) {
printk(KERN_ERR "tubirqs[%d] is NULL\n", irqhi);
return;
}
itubp = (*itubpp)[irqlo];
if (itubp == NULL) {
printk(KERN_ERR "tubirqs[%d][%d] is NULL\n", irqhi, irqlo);
return;
}
if (itubp->irqrc == 0)
free_irq(irq, &itubp->devstat);
(*itubpp)[irqlo] = NULL;
}
/*
* tubfiniirqs() -- clean up storage in tub_t *(*(*tubirqs)[256])[256]
*/
void
tubfiniirqs(void)
{
int i;
tub_t *(*itubpp)[256];
if (tubirqs != NULL) {
for (i = 0; i < 256; i++) {
if ((itubpp = (*tubirqs)[i])) {
kfree(itubpp);
(*tubirqs)[i] = NULL;
}
}
kfree(tubirqs);
tubirqs = NULL;
}
}
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