tuball.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:13k
- /*
- * 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() failedn");
- 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 devicesn", tubnummins - 1);
- break;
- } else {
- printk(KERN_INFO "3270: %.4x on sch %d, minor %dn",
- 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 NULLn");
- return;
- }
- itubpp = (*tubirqs)[irqhi];
- if (itubpp == NULL) {
- printk(KERN_ERR "tubirqs[%d] is NULLn", irqhi);
- return;
- }
- itubp = (*itubpp)[irqlo];
- if (itubp == NULL) {
- printk(KERN_ERR "tubirqs[%d][%d] is NULLn", 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;
- }
- }