Root/drivers/tty/moxa.c

1/*****************************************************************************/
2/*
3 * moxa.c -- MOXA Intellio family multiport serial driver.
4 *
5 * Copyright (C) 1999-2000 Moxa Technologies (support@moxa.com).
6 * Copyright (c) 2007 Jiri Slaby <jirislaby@gmail.com>
7 *
8 * This code is loosely based on the Linux serial driver, written by
9 * Linus Torvalds, Theodore T'so and others.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 */
16
17/*
18 * MOXA Intellio Series Driver
19 * for : LINUX
20 * date : 1999/1/7
21 * version : 5.1
22 */
23
24#include <linux/module.h>
25#include <linux/types.h>
26#include <linux/mm.h>
27#include <linux/ioport.h>
28#include <linux/errno.h>
29#include <linux/firmware.h>
30#include <linux/signal.h>
31#include <linux/sched.h>
32#include <linux/timer.h>
33#include <linux/interrupt.h>
34#include <linux/tty.h>
35#include <linux/tty_flip.h>
36#include <linux/major.h>
37#include <linux/string.h>
38#include <linux/fcntl.h>
39#include <linux/ptrace.h>
40#include <linux/serial.h>
41#include <linux/tty_driver.h>
42#include <linux/delay.h>
43#include <linux/pci.h>
44#include <linux/init.h>
45#include <linux/bitops.h>
46#include <linux/slab.h>
47#include <linux/ratelimit.h>
48
49#include <asm/io.h>
50#include <asm/uaccess.h>
51
52#include "moxa.h"
53
54#define MOXA_VERSION "6.0k"
55
56#define MOXA_FW_HDRLEN 32
57
58#define MOXAMAJOR 172
59
60#define MAX_BOARDS 4 /* Don't change this value */
61#define MAX_PORTS_PER_BOARD 32 /* Don't change this value */
62#define MAX_PORTS (MAX_BOARDS * MAX_PORTS_PER_BOARD)
63
64#define MOXA_IS_320(brd) ((brd)->boardType == MOXA_BOARD_C320_ISA || \
65        (brd)->boardType == MOXA_BOARD_C320_PCI)
66
67/*
68 * Define the Moxa PCI vendor and device IDs.
69 */
70#define MOXA_BUS_TYPE_ISA 0
71#define MOXA_BUS_TYPE_PCI 1
72
73enum {
74    MOXA_BOARD_C218_PCI = 1,
75    MOXA_BOARD_C218_ISA,
76    MOXA_BOARD_C320_PCI,
77    MOXA_BOARD_C320_ISA,
78    MOXA_BOARD_CP204J,
79};
80
81static char *moxa_brdname[] =
82{
83    "C218 Turbo PCI series",
84    "C218 Turbo ISA series",
85    "C320 Turbo PCI series",
86    "C320 Turbo ISA series",
87    "CP-204J series",
88};
89
90#ifdef CONFIG_PCI
91static struct pci_device_id moxa_pcibrds[] = {
92    { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C218),
93        .driver_data = MOXA_BOARD_C218_PCI },
94    { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C320),
95        .driver_data = MOXA_BOARD_C320_PCI },
96    { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP204J),
97        .driver_data = MOXA_BOARD_CP204J },
98    { 0 }
99};
100MODULE_DEVICE_TABLE(pci, moxa_pcibrds);
101#endif /* CONFIG_PCI */
102
103struct moxa_port;
104
105static struct moxa_board_conf {
106    int boardType;
107    int numPorts;
108    int busType;
109
110    unsigned int ready;
111
112    struct moxa_port *ports;
113
114    void __iomem *basemem;
115    void __iomem *intNdx;
116    void __iomem *intPend;
117    void __iomem *intTable;
118} moxa_boards[MAX_BOARDS];
119
120struct mxser_mstatus {
121    tcflag_t cflag;
122    int cts;
123    int dsr;
124    int ri;
125    int dcd;
126};
127
128struct moxaq_str {
129    int inq;
130    int outq;
131};
132
133struct moxa_port {
134    struct tty_port port;
135    struct moxa_board_conf *board;
136    void __iomem *tableAddr;
137
138    int type;
139    int cflag;
140    unsigned long statusflags;
141
142    u8 DCDState; /* Protected by the port lock */
143    u8 lineCtrl;
144    u8 lowChkFlag;
145};
146
147struct mon_str {
148    int tick;
149    int rxcnt[MAX_PORTS];
150    int txcnt[MAX_PORTS];
151};
152
153/* statusflags */
154#define TXSTOPPED 1
155#define LOWWAIT 2
156#define EMPTYWAIT 3
157
158#define SERIAL_DO_RESTART
159
160#define WAKEUP_CHARS 256
161
162static int ttymajor = MOXAMAJOR;
163static struct mon_str moxaLog;
164static unsigned int moxaFuncTout = HZ / 2;
165static unsigned int moxaLowWaterChk;
166static DEFINE_MUTEX(moxa_openlock);
167static DEFINE_SPINLOCK(moxa_lock);
168
169static unsigned long baseaddr[MAX_BOARDS];
170static unsigned int type[MAX_BOARDS];
171static unsigned int numports[MAX_BOARDS];
172
173MODULE_AUTHOR("William Chen");
174MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver");
175MODULE_LICENSE("GPL");
176MODULE_FIRMWARE("c218tunx.cod");
177MODULE_FIRMWARE("cp204unx.cod");
178MODULE_FIRMWARE("c320tunx.cod");
179
180module_param_array(type, uint, NULL, 0);
181MODULE_PARM_DESC(type, "card type: C218=2, C320=4");
182module_param_array(baseaddr, ulong, NULL, 0);
183MODULE_PARM_DESC(baseaddr, "base address");
184module_param_array(numports, uint, NULL, 0);
185MODULE_PARM_DESC(numports, "numports (ignored for C218)");
186
187module_param(ttymajor, int, 0);
188
189/*
190 * static functions:
191 */
192static int moxa_open(struct tty_struct *, struct file *);
193static void moxa_close(struct tty_struct *, struct file *);
194static int moxa_write(struct tty_struct *, const unsigned char *, int);
195static int moxa_write_room(struct tty_struct *);
196static void moxa_flush_buffer(struct tty_struct *);
197static int moxa_chars_in_buffer(struct tty_struct *);
198static void moxa_set_termios(struct tty_struct *, struct ktermios *);
199static void moxa_stop(struct tty_struct *);
200static void moxa_start(struct tty_struct *);
201static void moxa_hangup(struct tty_struct *);
202static int moxa_tiocmget(struct tty_struct *tty);
203static int moxa_tiocmset(struct tty_struct *tty,
204             unsigned int set, unsigned int clear);
205static void moxa_poll(unsigned long);
206static void moxa_set_tty_param(struct tty_struct *, struct ktermios *);
207static void moxa_shutdown(struct tty_port *);
208static int moxa_carrier_raised(struct tty_port *);
209static void moxa_dtr_rts(struct tty_port *, int);
210/*
211 * moxa board interface functions:
212 */
213static void MoxaPortEnable(struct moxa_port *);
214static void MoxaPortDisable(struct moxa_port *);
215static int MoxaPortSetTermio(struct moxa_port *, struct ktermios *, speed_t);
216static int MoxaPortGetLineOut(struct moxa_port *, int *, int *);
217static void MoxaPortLineCtrl(struct moxa_port *, int, int);
218static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int);
219static int MoxaPortLineStatus(struct moxa_port *);
220static void MoxaPortFlushData(struct moxa_port *, int);
221static int MoxaPortWriteData(struct tty_struct *, const unsigned char *, int);
222static int MoxaPortReadData(struct moxa_port *);
223static int MoxaPortTxQueue(struct moxa_port *);
224static int MoxaPortRxQueue(struct moxa_port *);
225static int MoxaPortTxFree(struct moxa_port *);
226static void MoxaPortTxDisable(struct moxa_port *);
227static void MoxaPortTxEnable(struct moxa_port *);
228static int moxa_get_serial_info(struct moxa_port *, struct serial_struct __user *);
229static int moxa_set_serial_info(struct moxa_port *, struct serial_struct __user *);
230static void MoxaSetFifo(struct moxa_port *port, int enable);
231
232/*
233 * I/O functions
234 */
235
236static DEFINE_SPINLOCK(moxafunc_lock);
237
238static void moxa_wait_finish(void __iomem *ofsAddr)
239{
240    unsigned long end = jiffies + moxaFuncTout;
241
242    while (readw(ofsAddr + FuncCode) != 0)
243        if (time_after(jiffies, end))
244            return;
245    if (readw(ofsAddr + FuncCode) != 0)
246        printk_ratelimited(KERN_WARNING "moxa function expired\n");
247}
248
249static void moxafunc(void __iomem *ofsAddr, u16 cmd, u16 arg)
250{
251        unsigned long flags;
252        spin_lock_irqsave(&moxafunc_lock, flags);
253    writew(arg, ofsAddr + FuncArg);
254    writew(cmd, ofsAddr + FuncCode);
255    moxa_wait_finish(ofsAddr);
256    spin_unlock_irqrestore(&moxafunc_lock, flags);
257}
258
259static int moxafuncret(void __iomem *ofsAddr, u16 cmd, u16 arg)
260{
261        unsigned long flags;
262        u16 ret;
263        spin_lock_irqsave(&moxafunc_lock, flags);
264    writew(arg, ofsAddr + FuncArg);
265    writew(cmd, ofsAddr + FuncCode);
266    moxa_wait_finish(ofsAddr);
267    ret = readw(ofsAddr + FuncArg);
268    spin_unlock_irqrestore(&moxafunc_lock, flags);
269    return ret;
270}
271
272static void moxa_low_water_check(void __iomem *ofsAddr)
273{
274    u16 rptr, wptr, mask, len;
275
276    if (readb(ofsAddr + FlagStat) & Xoff_state) {
277        rptr = readw(ofsAddr + RXrptr);
278        wptr = readw(ofsAddr + RXwptr);
279        mask = readw(ofsAddr + RX_mask);
280        len = (wptr - rptr) & mask;
281        if (len <= Low_water)
282            moxafunc(ofsAddr, FC_SendXon, 0);
283    }
284}
285
286/*
287 * TTY operations
288 */
289
290static int moxa_ioctl(struct tty_struct *tty,
291              unsigned int cmd, unsigned long arg)
292{
293    struct moxa_port *ch = tty->driver_data;
294    void __user *argp = (void __user *)arg;
295    int status, ret = 0;
296
297    if (tty->index == MAX_PORTS) {
298        if (cmd != MOXA_GETDATACOUNT && cmd != MOXA_GET_IOQUEUE &&
299                cmd != MOXA_GETMSTATUS)
300            return -EINVAL;
301    } else if (!ch)
302        return -ENODEV;
303
304    switch (cmd) {
305    case MOXA_GETDATACOUNT:
306        moxaLog.tick = jiffies;
307        if (copy_to_user(argp, &moxaLog, sizeof(moxaLog)))
308            ret = -EFAULT;
309        break;
310    case MOXA_FLUSH_QUEUE:
311        MoxaPortFlushData(ch, arg);
312        break;
313    case MOXA_GET_IOQUEUE: {
314        struct moxaq_str __user *argm = argp;
315        struct moxaq_str tmp;
316        struct moxa_port *p;
317        unsigned int i, j;
318
319        for (i = 0; i < MAX_BOARDS; i++) {
320            p = moxa_boards[i].ports;
321            for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
322                memset(&tmp, 0, sizeof(tmp));
323                spin_lock_bh(&moxa_lock);
324                if (moxa_boards[i].ready) {
325                    tmp.inq = MoxaPortRxQueue(p);
326                    tmp.outq = MoxaPortTxQueue(p);
327                }
328                spin_unlock_bh(&moxa_lock);
329                if (copy_to_user(argm, &tmp, sizeof(tmp)))
330                    return -EFAULT;
331            }
332        }
333        break;
334    } case MOXA_GET_OQUEUE:
335        status = MoxaPortTxQueue(ch);
336        ret = put_user(status, (unsigned long __user *)argp);
337        break;
338    case MOXA_GET_IQUEUE:
339        status = MoxaPortRxQueue(ch);
340        ret = put_user(status, (unsigned long __user *)argp);
341        break;
342    case MOXA_GETMSTATUS: {
343        struct mxser_mstatus __user *argm = argp;
344        struct mxser_mstatus tmp;
345        struct moxa_port *p;
346        unsigned int i, j;
347
348        for (i = 0; i < MAX_BOARDS; i++) {
349            p = moxa_boards[i].ports;
350            for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
351                struct tty_struct *ttyp;
352                memset(&tmp, 0, sizeof(tmp));
353                spin_lock_bh(&moxa_lock);
354                if (!moxa_boards[i].ready) {
355                        spin_unlock_bh(&moxa_lock);
356                    goto copy;
357                                }
358
359                status = MoxaPortLineStatus(p);
360                spin_unlock_bh(&moxa_lock);
361
362                if (status & 1)
363                    tmp.cts = 1;
364                if (status & 2)
365                    tmp.dsr = 1;
366                if (status & 4)
367                    tmp.dcd = 1;
368
369                ttyp = tty_port_tty_get(&p->port);
370                if (!ttyp || !ttyp->termios)
371                    tmp.cflag = p->cflag;
372                else
373                    tmp.cflag = ttyp->termios->c_cflag;
374                tty_kref_put(ttyp);
375copy:
376                if (copy_to_user(argm, &tmp, sizeof(tmp)))
377                    return -EFAULT;
378            }
379        }
380        break;
381    }
382    case TIOCGSERIAL:
383            mutex_lock(&ch->port.mutex);
384        ret = moxa_get_serial_info(ch, argp);
385        mutex_unlock(&ch->port.mutex);
386        break;
387    case TIOCSSERIAL:
388            mutex_lock(&ch->port.mutex);
389        ret = moxa_set_serial_info(ch, argp);
390        mutex_unlock(&ch->port.mutex);
391        break;
392    default:
393        ret = -ENOIOCTLCMD;
394    }
395    return ret;
396}
397
398static int moxa_break_ctl(struct tty_struct *tty, int state)
399{
400    struct moxa_port *port = tty->driver_data;
401
402    moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak,
403            Magic_code);
404    return 0;
405}
406
407static const struct tty_operations moxa_ops = {
408    .open = moxa_open,
409    .close = moxa_close,
410    .write = moxa_write,
411    .write_room = moxa_write_room,
412    .flush_buffer = moxa_flush_buffer,
413    .chars_in_buffer = moxa_chars_in_buffer,
414    .ioctl = moxa_ioctl,
415    .set_termios = moxa_set_termios,
416    .stop = moxa_stop,
417    .start = moxa_start,
418    .hangup = moxa_hangup,
419    .break_ctl = moxa_break_ctl,
420    .tiocmget = moxa_tiocmget,
421    .tiocmset = moxa_tiocmset,
422};
423
424static const struct tty_port_operations moxa_port_ops = {
425    .carrier_raised = moxa_carrier_raised,
426    .dtr_rts = moxa_dtr_rts,
427    .shutdown = moxa_shutdown,
428};
429
430static struct tty_driver *moxaDriver;
431static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0);
432
433/*
434 * HW init
435 */
436
437static int moxa_check_fw_model(struct moxa_board_conf *brd, u8 model)
438{
439    switch (brd->boardType) {
440    case MOXA_BOARD_C218_ISA:
441    case MOXA_BOARD_C218_PCI:
442        if (model != 1)
443            goto err;
444        break;
445    case MOXA_BOARD_CP204J:
446        if (model != 3)
447            goto err;
448        break;
449    default:
450        if (model != 2)
451            goto err;
452        break;
453    }
454    return 0;
455err:
456    return -EINVAL;
457}
458
459static int moxa_check_fw(const void *ptr)
460{
461    const __le16 *lptr = ptr;
462
463    if (*lptr != cpu_to_le16(0x7980))
464        return -EINVAL;
465
466    return 0;
467}
468
469static int moxa_load_bios(struct moxa_board_conf *brd, const u8 *buf,
470        size_t len)
471{
472    void __iomem *baseAddr = brd->basemem;
473    u16 tmp;
474
475    writeb(HW_reset, baseAddr + Control_reg); /* reset */
476    msleep(10);
477    memset_io(baseAddr, 0, 4096);
478    memcpy_toio(baseAddr, buf, len); /* download BIOS */
479    writeb(0, baseAddr + Control_reg); /* restart */
480
481    msleep(2000);
482
483    switch (brd->boardType) {
484    case MOXA_BOARD_C218_ISA:
485    case MOXA_BOARD_C218_PCI:
486        tmp = readw(baseAddr + C218_key);
487        if (tmp != C218_KeyCode)
488            goto err;
489        break;
490    case MOXA_BOARD_CP204J:
491        tmp = readw(baseAddr + C218_key);
492        if (tmp != CP204J_KeyCode)
493            goto err;
494        break;
495    default:
496        tmp = readw(baseAddr + C320_key);
497        if (tmp != C320_KeyCode)
498            goto err;
499        tmp = readw(baseAddr + C320_status);
500        if (tmp != STS_init) {
501            printk(KERN_ERR "MOXA: bios upload failed -- CPU/Basic "
502                    "module not found\n");
503            return -EIO;
504        }
505        break;
506    }
507
508    return 0;
509err:
510    printk(KERN_ERR "MOXA: bios upload failed -- board not found\n");
511    return -EIO;
512}
513
514static int moxa_load_320b(struct moxa_board_conf *brd, const u8 *ptr,
515        size_t len)
516{
517    void __iomem *baseAddr = brd->basemem;
518
519    if (len < 7168) {
520        printk(KERN_ERR "MOXA: invalid 320 bios -- too short\n");
521        return -EINVAL;
522    }
523
524    writew(len - 7168 - 2, baseAddr + C320bapi_len);
525    writeb(1, baseAddr + Control_reg); /* Select Page 1 */
526    memcpy_toio(baseAddr + DynPage_addr, ptr, 7168);
527    writeb(2, baseAddr + Control_reg); /* Select Page 2 */
528    memcpy_toio(baseAddr + DynPage_addr, ptr + 7168, len - 7168);
529
530    return 0;
531}
532
533static int moxa_real_load_code(struct moxa_board_conf *brd, const void *ptr,
534        size_t len)
535{
536    void __iomem *baseAddr = brd->basemem;
537    const __le16 *uptr = ptr;
538    size_t wlen, len2, j;
539    unsigned long key, loadbuf, loadlen, checksum, checksum_ok;
540    unsigned int i, retry;
541    u16 usum, keycode;
542
543    keycode = (brd->boardType == MOXA_BOARD_CP204J) ? CP204J_KeyCode :
544                C218_KeyCode;
545
546    switch (brd->boardType) {
547    case MOXA_BOARD_CP204J:
548    case MOXA_BOARD_C218_ISA:
549    case MOXA_BOARD_C218_PCI:
550        key = C218_key;
551        loadbuf = C218_LoadBuf;
552        loadlen = C218DLoad_len;
553        checksum = C218check_sum;
554        checksum_ok = C218chksum_ok;
555        break;
556    default:
557        key = C320_key;
558        keycode = C320_KeyCode;
559        loadbuf = C320_LoadBuf;
560        loadlen = C320DLoad_len;
561        checksum = C320check_sum;
562        checksum_ok = C320chksum_ok;
563        break;
564    }
565
566    usum = 0;
567    wlen = len >> 1;
568    for (i = 0; i < wlen; i++)
569        usum += le16_to_cpu(uptr[i]);
570    retry = 0;
571    do {
572        wlen = len >> 1;
573        j = 0;
574        while (wlen) {
575            len2 = (wlen > 2048) ? 2048 : wlen;
576            wlen -= len2;
577            memcpy_toio(baseAddr + loadbuf, ptr + j, len2 << 1);
578            j += len2 << 1;
579
580            writew(len2, baseAddr + loadlen);
581            writew(0, baseAddr + key);
582            for (i = 0; i < 100; i++) {
583                if (readw(baseAddr + key) == keycode)
584                    break;
585                msleep(10);
586            }
587            if (readw(baseAddr + key) != keycode)
588                return -EIO;
589        }
590        writew(0, baseAddr + loadlen);
591        writew(usum, baseAddr + checksum);
592        writew(0, baseAddr + key);
593        for (i = 0; i < 100; i++) {
594            if (readw(baseAddr + key) == keycode)
595                break;
596            msleep(10);
597        }
598        retry++;
599    } while ((readb(baseAddr + checksum_ok) != 1) && (retry < 3));
600    if (readb(baseAddr + checksum_ok) != 1)
601        return -EIO;
602
603    writew(0, baseAddr + key);
604    for (i = 0; i < 600; i++) {
605        if (readw(baseAddr + Magic_no) == Magic_code)
606            break;
607        msleep(10);
608    }
609    if (readw(baseAddr + Magic_no) != Magic_code)
610        return -EIO;
611
612    if (MOXA_IS_320(brd)) {
613        if (brd->busType == MOXA_BUS_TYPE_PCI) { /* ASIC board */
614            writew(0x3800, baseAddr + TMS320_PORT1);
615            writew(0x3900, baseAddr + TMS320_PORT2);
616            writew(28499, baseAddr + TMS320_CLOCK);
617        } else {
618            writew(0x3200, baseAddr + TMS320_PORT1);
619            writew(0x3400, baseAddr + TMS320_PORT2);
620            writew(19999, baseAddr + TMS320_CLOCK);
621        }
622    }
623    writew(1, baseAddr + Disable_IRQ);
624    writew(0, baseAddr + Magic_no);
625    for (i = 0; i < 500; i++) {
626        if (readw(baseAddr + Magic_no) == Magic_code)
627            break;
628        msleep(10);
629    }
630    if (readw(baseAddr + Magic_no) != Magic_code)
631        return -EIO;
632
633    if (MOXA_IS_320(brd)) {
634        j = readw(baseAddr + Module_cnt);
635        if (j <= 0)
636            return -EIO;
637        brd->numPorts = j * 8;
638        writew(j, baseAddr + Module_no);
639        writew(0, baseAddr + Magic_no);
640        for (i = 0; i < 600; i++) {
641            if (readw(baseAddr + Magic_no) == Magic_code)
642                break;
643            msleep(10);
644        }
645        if (readw(baseAddr + Magic_no) != Magic_code)
646            return -EIO;
647    }
648    brd->intNdx = baseAddr + IRQindex;
649    brd->intPend = baseAddr + IRQpending;
650    brd->intTable = baseAddr + IRQtable;
651
652    return 0;
653}
654
655static int moxa_load_code(struct moxa_board_conf *brd, const void *ptr,
656        size_t len)
657{
658    void __iomem *ofsAddr, *baseAddr = brd->basemem;
659    struct moxa_port *port;
660    int retval, i;
661
662    if (len % 2) {
663        printk(KERN_ERR "MOXA: bios length is not even\n");
664        return -EINVAL;
665    }
666
667    retval = moxa_real_load_code(brd, ptr, len); /* may change numPorts */
668    if (retval)
669        return retval;
670
671    switch (brd->boardType) {
672    case MOXA_BOARD_C218_ISA:
673    case MOXA_BOARD_C218_PCI:
674    case MOXA_BOARD_CP204J:
675        port = brd->ports;
676        for (i = 0; i < brd->numPorts; i++, port++) {
677            port->board = brd;
678            port->DCDState = 0;
679            port->tableAddr = baseAddr + Extern_table +
680                    Extern_size * i;
681            ofsAddr = port->tableAddr;
682            writew(C218rx_mask, ofsAddr + RX_mask);
683            writew(C218tx_mask, ofsAddr + TX_mask);
684            writew(C218rx_spage + i * C218buf_pageno, ofsAddr + Page_rxb);
685            writew(readw(ofsAddr + Page_rxb) + C218rx_pageno, ofsAddr + EndPage_rxb);
686
687            writew(C218tx_spage + i * C218buf_pageno, ofsAddr + Page_txb);
688            writew(readw(ofsAddr + Page_txb) + C218tx_pageno, ofsAddr + EndPage_txb);
689
690        }
691        break;
692    default:
693        port = brd->ports;
694        for (i = 0; i < brd->numPorts; i++, port++) {
695            port->board = brd;
696            port->DCDState = 0;
697            port->tableAddr = baseAddr + Extern_table +
698                    Extern_size * i;
699            ofsAddr = port->tableAddr;
700            switch (brd->numPorts) {
701            case 8:
702                writew(C320p8rx_mask, ofsAddr + RX_mask);
703                writew(C320p8tx_mask, ofsAddr + TX_mask);
704                writew(C320p8rx_spage + i * C320p8buf_pgno, ofsAddr + Page_rxb);
705                writew(readw(ofsAddr + Page_rxb) + C320p8rx_pgno, ofsAddr + EndPage_rxb);
706                writew(C320p8tx_spage + i * C320p8buf_pgno, ofsAddr + Page_txb);
707                writew(readw(ofsAddr + Page_txb) + C320p8tx_pgno, ofsAddr + EndPage_txb);
708
709                break;
710            case 16:
711                writew(C320p16rx_mask, ofsAddr + RX_mask);
712                writew(C320p16tx_mask, ofsAddr + TX_mask);
713                writew(C320p16rx_spage + i * C320p16buf_pgno, ofsAddr + Page_rxb);
714                writew(readw(ofsAddr + Page_rxb) + C320p16rx_pgno, ofsAddr + EndPage_rxb);
715                writew(C320p16tx_spage + i * C320p16buf_pgno, ofsAddr + Page_txb);
716                writew(readw(ofsAddr + Page_txb) + C320p16tx_pgno, ofsAddr + EndPage_txb);
717                break;
718
719            case 24:
720                writew(C320p24rx_mask, ofsAddr + RX_mask);
721                writew(C320p24tx_mask, ofsAddr + TX_mask);
722                writew(C320p24rx_spage + i * C320p24buf_pgno, ofsAddr + Page_rxb);
723                writew(readw(ofsAddr + Page_rxb) + C320p24rx_pgno, ofsAddr + EndPage_rxb);
724                writew(C320p24tx_spage + i * C320p24buf_pgno, ofsAddr + Page_txb);
725                writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
726                break;
727            case 32:
728                writew(C320p32rx_mask, ofsAddr + RX_mask);
729                writew(C320p32tx_mask, ofsAddr + TX_mask);
730                writew(C320p32tx_ofs, ofsAddr + Ofs_txb);
731                writew(C320p32rx_spage + i * C320p32buf_pgno, ofsAddr + Page_rxb);
732                writew(readb(ofsAddr + Page_rxb), ofsAddr + EndPage_rxb);
733                writew(C320p32tx_spage + i * C320p32buf_pgno, ofsAddr + Page_txb);
734                writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
735                break;
736            }
737        }
738        break;
739    }
740    return 0;
741}
742
743static int moxa_load_fw(struct moxa_board_conf *brd, const struct firmware *fw)
744{
745    const void *ptr = fw->data;
746    char rsn[64];
747    u16 lens[5];
748    size_t len;
749    unsigned int a, lenp, lencnt;
750    int ret = -EINVAL;
751    struct {
752        __le32 magic; /* 0x34303430 */
753        u8 reserved1[2];
754        u8 type; /* UNIX = 3 */
755        u8 model; /* C218T=1, C320T=2, CP204=3 */
756        u8 reserved2[8];
757        __le16 len[5];
758    } const *hdr = ptr;
759
760    BUILD_BUG_ON(ARRAY_SIZE(hdr->len) != ARRAY_SIZE(lens));
761
762    if (fw->size < MOXA_FW_HDRLEN) {
763        strcpy(rsn, "too short (even header won't fit)");
764        goto err;
765    }
766    if (hdr->magic != cpu_to_le32(0x30343034)) {
767        sprintf(rsn, "bad magic: %.8x", le32_to_cpu(hdr->magic));
768        goto err;
769    }
770    if (hdr->type != 3) {
771        sprintf(rsn, "not for linux, type is %u", hdr->type);
772        goto err;
773    }
774    if (moxa_check_fw_model(brd, hdr->model)) {
775        sprintf(rsn, "not for this card, model is %u", hdr->model);
776        goto err;
777    }
778
779    len = MOXA_FW_HDRLEN;
780    lencnt = hdr->model == 2 ? 5 : 3;
781    for (a = 0; a < ARRAY_SIZE(lens); a++) {
782        lens[a] = le16_to_cpu(hdr->len[a]);
783        if (lens[a] && len + lens[a] <= fw->size &&
784                moxa_check_fw(&fw->data[len]))
785            printk(KERN_WARNING "MOXA firmware: unexpected input "
786                "at offset %u, but going on\n", (u32)len);
787        if (!lens[a] && a < lencnt) {
788            sprintf(rsn, "too few entries in fw file");
789            goto err;
790        }
791        len += lens[a];
792    }
793
794    if (len != fw->size) {
795        sprintf(rsn, "bad length: %u (should be %u)", (u32)fw->size,
796                (u32)len);
797        goto err;
798    }
799
800    ptr += MOXA_FW_HDRLEN;
801    lenp = 0; /* bios */
802
803    strcpy(rsn, "read above");
804
805    ret = moxa_load_bios(brd, ptr, lens[lenp]);
806    if (ret)
807        goto err;
808
809    /* we skip the tty section (lens[1]), since we don't need it */
810    ptr += lens[lenp] + lens[lenp + 1];
811    lenp += 2; /* comm */
812
813    if (hdr->model == 2) {
814        ret = moxa_load_320b(brd, ptr, lens[lenp]);
815        if (ret)
816            goto err;
817        /* skip another tty */
818        ptr += lens[lenp] + lens[lenp + 1];
819        lenp += 2;
820    }
821
822    ret = moxa_load_code(brd, ptr, lens[lenp]);
823    if (ret)
824        goto err;
825
826    return 0;
827err:
828    printk(KERN_ERR "firmware failed to load, reason: %s\n", rsn);
829    return ret;
830}
831
832static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev)
833{
834    const struct firmware *fw;
835    const char *file;
836    struct moxa_port *p;
837    unsigned int i;
838    int ret;
839
840    brd->ports = kcalloc(MAX_PORTS_PER_BOARD, sizeof(*brd->ports),
841            GFP_KERNEL);
842    if (brd->ports == NULL) {
843        printk(KERN_ERR "cannot allocate memory for ports\n");
844        ret = -ENOMEM;
845        goto err;
846    }
847
848    for (i = 0, p = brd->ports; i < MAX_PORTS_PER_BOARD; i++, p++) {
849        tty_port_init(&p->port);
850        p->port.ops = &moxa_port_ops;
851        p->type = PORT_16550A;
852        p->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
853    }
854
855    switch (brd->boardType) {
856    case MOXA_BOARD_C218_ISA:
857    case MOXA_BOARD_C218_PCI:
858        file = "c218tunx.cod";
859        break;
860    case MOXA_BOARD_CP204J:
861        file = "cp204unx.cod";
862        break;
863    default:
864        file = "c320tunx.cod";
865        break;
866    }
867
868    ret = request_firmware(&fw, file, dev);
869    if (ret) {
870        printk(KERN_ERR "MOXA: request_firmware failed. Make sure "
871                "you've placed '%s' file into your firmware "
872                "loader directory (e.g. /lib/firmware)\n",
873                file);
874        goto err_free;
875    }
876
877    ret = moxa_load_fw(brd, fw);
878
879    release_firmware(fw);
880
881    if (ret)
882        goto err_free;
883
884    spin_lock_bh(&moxa_lock);
885    brd->ready = 1;
886    if (!timer_pending(&moxaTimer))
887        mod_timer(&moxaTimer, jiffies + HZ / 50);
888    spin_unlock_bh(&moxa_lock);
889
890    return 0;
891err_free:
892    kfree(brd->ports);
893err:
894    return ret;
895}
896
897static void moxa_board_deinit(struct moxa_board_conf *brd)
898{
899    unsigned int a, opened;
900
901    mutex_lock(&moxa_openlock);
902    spin_lock_bh(&moxa_lock);
903    brd->ready = 0;
904    spin_unlock_bh(&moxa_lock);
905
906    /* pci hot-un-plug support */
907    for (a = 0; a < brd->numPorts; a++)
908        if (brd->ports[a].port.flags & ASYNC_INITIALIZED) {
909            struct tty_struct *tty = tty_port_tty_get(
910                        &brd->ports[a].port);
911            if (tty) {
912                tty_hangup(tty);
913                tty_kref_put(tty);
914            }
915        }
916    while (1) {
917        opened = 0;
918        for (a = 0; a < brd->numPorts; a++)
919            if (brd->ports[a].port.flags & ASYNC_INITIALIZED)
920                opened++;
921        mutex_unlock(&moxa_openlock);
922        if (!opened)
923            break;
924        msleep(50);
925        mutex_lock(&moxa_openlock);
926    }
927
928    iounmap(brd->basemem);
929    brd->basemem = NULL;
930    kfree(brd->ports);
931}
932
933#ifdef CONFIG_PCI
934static int __devinit moxa_pci_probe(struct pci_dev *pdev,
935        const struct pci_device_id *ent)
936{
937    struct moxa_board_conf *board;
938    unsigned int i;
939    int board_type = ent->driver_data;
940    int retval;
941
942    retval = pci_enable_device(pdev);
943    if (retval) {
944        dev_err(&pdev->dev, "can't enable pci device\n");
945        goto err;
946    }
947
948    for (i = 0; i < MAX_BOARDS; i++)
949        if (moxa_boards[i].basemem == NULL)
950            break;
951
952    retval = -ENODEV;
953    if (i >= MAX_BOARDS) {
954        dev_warn(&pdev->dev, "more than %u MOXA Intellio family boards "
955                "found. Board is ignored.\n", MAX_BOARDS);
956        goto err;
957    }
958
959    board = &moxa_boards[i];
960
961    retval = pci_request_region(pdev, 2, "moxa-base");
962    if (retval) {
963        dev_err(&pdev->dev, "can't request pci region 2\n");
964        goto err;
965    }
966
967    board->basemem = ioremap_nocache(pci_resource_start(pdev, 2), 0x4000);
968    if (board->basemem == NULL) {
969        dev_err(&pdev->dev, "can't remap io space 2\n");
970        goto err_reg;
971    }
972
973    board->boardType = board_type;
974    switch (board_type) {
975    case MOXA_BOARD_C218_ISA:
976    case MOXA_BOARD_C218_PCI:
977        board->numPorts = 8;
978        break;
979
980    case MOXA_BOARD_CP204J:
981        board->numPorts = 4;
982        break;
983    default:
984        board->numPorts = 0;
985        break;
986    }
987    board->busType = MOXA_BUS_TYPE_PCI;
988
989    retval = moxa_init_board(board, &pdev->dev);
990    if (retval)
991        goto err_base;
992
993    pci_set_drvdata(pdev, board);
994
995    dev_info(&pdev->dev, "board '%s' ready (%u ports, firmware loaded)\n",
996            moxa_brdname[board_type - 1], board->numPorts);
997
998    return 0;
999err_base:
1000    iounmap(board->basemem);
1001    board->basemem = NULL;
1002err_reg:
1003    pci_release_region(pdev, 2);
1004err:
1005    return retval;
1006}
1007
1008static void __devexit moxa_pci_remove(struct pci_dev *pdev)
1009{
1010    struct moxa_board_conf *brd = pci_get_drvdata(pdev);
1011
1012    moxa_board_deinit(brd);
1013
1014    pci_release_region(pdev, 2);
1015}
1016
1017static struct pci_driver moxa_pci_driver = {
1018    .name = "moxa",
1019    .id_table = moxa_pcibrds,
1020    .probe = moxa_pci_probe,
1021    .remove = __devexit_p(moxa_pci_remove)
1022};
1023#endif /* CONFIG_PCI */
1024
1025static int __init moxa_init(void)
1026{
1027    unsigned int isabrds = 0;
1028    int retval = 0;
1029    struct moxa_board_conf *brd = moxa_boards;
1030    unsigned int i;
1031
1032    printk(KERN_INFO "MOXA Intellio family driver version %s\n",
1033            MOXA_VERSION);
1034    moxaDriver = alloc_tty_driver(MAX_PORTS + 1);
1035    if (!moxaDriver)
1036        return -ENOMEM;
1037
1038    moxaDriver->name = "ttyMX";
1039    moxaDriver->major = ttymajor;
1040    moxaDriver->minor_start = 0;
1041    moxaDriver->type = TTY_DRIVER_TYPE_SERIAL;
1042    moxaDriver->subtype = SERIAL_TYPE_NORMAL;
1043    moxaDriver->init_termios = tty_std_termios;
1044    moxaDriver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
1045    moxaDriver->init_termios.c_ispeed = 9600;
1046    moxaDriver->init_termios.c_ospeed = 9600;
1047    moxaDriver->flags = TTY_DRIVER_REAL_RAW;
1048    tty_set_operations(moxaDriver, &moxa_ops);
1049
1050    if (tty_register_driver(moxaDriver)) {
1051        printk(KERN_ERR "can't register MOXA Smartio tty driver!\n");
1052        put_tty_driver(moxaDriver);
1053        return -1;
1054    }
1055
1056    /* Find the boards defined from module args. */
1057
1058    for (i = 0; i < MAX_BOARDS; i++) {
1059        if (!baseaddr[i])
1060            break;
1061        if (type[i] == MOXA_BOARD_C218_ISA ||
1062                type[i] == MOXA_BOARD_C320_ISA) {
1063            pr_debug("Moxa board %2d: %s board(baseAddr=%lx)\n",
1064                    isabrds + 1, moxa_brdname[type[i] - 1],
1065                    baseaddr[i]);
1066            brd->boardType = type[i];
1067            brd->numPorts = type[i] == MOXA_BOARD_C218_ISA ? 8 :
1068                    numports[i];
1069            brd->busType = MOXA_BUS_TYPE_ISA;
1070            brd->basemem = ioremap_nocache(baseaddr[i], 0x4000);
1071            if (!brd->basemem) {
1072                printk(KERN_ERR "MOXA: can't remap %lx\n",
1073                        baseaddr[i]);
1074                continue;
1075            }
1076            if (moxa_init_board(brd, NULL)) {
1077                iounmap(brd->basemem);
1078                brd->basemem = NULL;
1079                continue;
1080            }
1081
1082            printk(KERN_INFO "MOXA isa board found at 0x%.8lu and "
1083                    "ready (%u ports, firmware loaded)\n",
1084                    baseaddr[i], brd->numPorts);
1085
1086            brd++;
1087            isabrds++;
1088        }
1089    }
1090
1091#ifdef CONFIG_PCI
1092    retval = pci_register_driver(&moxa_pci_driver);
1093    if (retval) {
1094        printk(KERN_ERR "Can't register MOXA pci driver!\n");
1095        if (isabrds)
1096            retval = 0;
1097    }
1098#endif
1099
1100    return retval;
1101}
1102
1103static void __exit moxa_exit(void)
1104{
1105    unsigned int i;
1106
1107#ifdef CONFIG_PCI
1108    pci_unregister_driver(&moxa_pci_driver);
1109#endif
1110
1111    for (i = 0; i < MAX_BOARDS; i++) /* ISA boards */
1112        if (moxa_boards[i].ready)
1113            moxa_board_deinit(&moxa_boards[i]);
1114
1115    del_timer_sync(&moxaTimer);
1116
1117    if (tty_unregister_driver(moxaDriver))
1118        printk(KERN_ERR "Couldn't unregister MOXA Intellio family "
1119                "serial driver\n");
1120    put_tty_driver(moxaDriver);
1121}
1122
1123module_init(moxa_init);
1124module_exit(moxa_exit);
1125
1126static void moxa_shutdown(struct tty_port *port)
1127{
1128    struct moxa_port *ch = container_of(port, struct moxa_port, port);
1129        MoxaPortDisable(ch);
1130    MoxaPortFlushData(ch, 2);
1131}
1132
1133static int moxa_carrier_raised(struct tty_port *port)
1134{
1135    struct moxa_port *ch = container_of(port, struct moxa_port, port);
1136    int dcd;
1137
1138    spin_lock_irq(&port->lock);
1139    dcd = ch->DCDState;
1140    spin_unlock_irq(&port->lock);
1141    return dcd;
1142}
1143
1144static void moxa_dtr_rts(struct tty_port *port, int onoff)
1145{
1146    struct moxa_port *ch = container_of(port, struct moxa_port, port);
1147    MoxaPortLineCtrl(ch, onoff, onoff);
1148}
1149
1150
1151static int moxa_open(struct tty_struct *tty, struct file *filp)
1152{
1153    struct moxa_board_conf *brd;
1154    struct moxa_port *ch;
1155    int port;
1156
1157    port = tty->index;
1158    if (port == MAX_PORTS) {
1159        return capable(CAP_SYS_ADMIN) ? 0 : -EPERM;
1160    }
1161    if (mutex_lock_interruptible(&moxa_openlock))
1162        return -ERESTARTSYS;
1163    brd = &moxa_boards[port / MAX_PORTS_PER_BOARD];
1164    if (!brd->ready) {
1165        mutex_unlock(&moxa_openlock);
1166        return -ENODEV;
1167    }
1168
1169    if (port % MAX_PORTS_PER_BOARD >= brd->numPorts) {
1170        mutex_unlock(&moxa_openlock);
1171        return -ENODEV;
1172    }
1173
1174    ch = &brd->ports[port % MAX_PORTS_PER_BOARD];
1175    ch->port.count++;
1176    tty->driver_data = ch;
1177    tty_port_tty_set(&ch->port, tty);
1178    mutex_lock(&ch->port.mutex);
1179    if (!(ch->port.flags & ASYNC_INITIALIZED)) {
1180        ch->statusflags = 0;
1181        moxa_set_tty_param(tty, tty->termios);
1182        MoxaPortLineCtrl(ch, 1, 1);
1183        MoxaPortEnable(ch);
1184        MoxaSetFifo(ch, ch->type == PORT_16550A);
1185        ch->port.flags |= ASYNC_INITIALIZED;
1186    }
1187    mutex_unlock(&ch->port.mutex);
1188    mutex_unlock(&moxa_openlock);
1189
1190    return tty_port_block_til_ready(&ch->port, tty, filp);
1191}
1192
1193static void moxa_close(struct tty_struct *tty, struct file *filp)
1194{
1195    struct moxa_port *ch = tty->driver_data;
1196    ch->cflag = tty->termios->c_cflag;
1197    tty_port_close(&ch->port, tty, filp);
1198}
1199
1200static int moxa_write(struct tty_struct *tty,
1201              const unsigned char *buf, int count)
1202{
1203    struct moxa_port *ch = tty->driver_data;
1204    unsigned long flags;
1205    int len;
1206
1207    if (ch == NULL)
1208        return 0;
1209
1210    spin_lock_irqsave(&moxa_lock, flags);
1211    len = MoxaPortWriteData(tty, buf, count);
1212    spin_unlock_irqrestore(&moxa_lock, flags);
1213
1214    set_bit(LOWWAIT, &ch->statusflags);
1215    return len;
1216}
1217
1218static int moxa_write_room(struct tty_struct *tty)
1219{
1220    struct moxa_port *ch;
1221
1222    if (tty->stopped)
1223        return 0;
1224    ch = tty->driver_data;
1225    if (ch == NULL)
1226        return 0;
1227    return MoxaPortTxFree(ch);
1228}
1229
1230static void moxa_flush_buffer(struct tty_struct *tty)
1231{
1232    struct moxa_port *ch = tty->driver_data;
1233
1234    if (ch == NULL)
1235        return;
1236    MoxaPortFlushData(ch, 1);
1237    tty_wakeup(tty);
1238}
1239
1240static int moxa_chars_in_buffer(struct tty_struct *tty)
1241{
1242    struct moxa_port *ch = tty->driver_data;
1243    int chars;
1244
1245    chars = MoxaPortTxQueue(ch);
1246    if (chars)
1247        /*
1248         * Make it possible to wakeup anything waiting for output
1249         * in tty_ioctl.c, etc.
1250         */
1251            set_bit(EMPTYWAIT, &ch->statusflags);
1252    return chars;
1253}
1254
1255static int moxa_tiocmget(struct tty_struct *tty)
1256{
1257    struct moxa_port *ch = tty->driver_data;
1258    int flag = 0, dtr, rts;
1259
1260    MoxaPortGetLineOut(ch, &dtr, &rts);
1261    if (dtr)
1262        flag |= TIOCM_DTR;
1263    if (rts)
1264        flag |= TIOCM_RTS;
1265    dtr = MoxaPortLineStatus(ch);
1266    if (dtr & 1)
1267        flag |= TIOCM_CTS;
1268    if (dtr & 2)
1269        flag |= TIOCM_DSR;
1270    if (dtr & 4)
1271        flag |= TIOCM_CD;
1272    return flag;
1273}
1274
1275static int moxa_tiocmset(struct tty_struct *tty,
1276             unsigned int set, unsigned int clear)
1277{
1278    struct moxa_port *ch;
1279    int dtr, rts;
1280
1281    mutex_lock(&moxa_openlock);
1282    ch = tty->driver_data;
1283    if (!ch) {
1284        mutex_unlock(&moxa_openlock);
1285        return -EINVAL;
1286    }
1287
1288    MoxaPortGetLineOut(ch, &dtr, &rts);
1289    if (set & TIOCM_RTS)
1290        rts = 1;
1291    if (set & TIOCM_DTR)
1292        dtr = 1;
1293    if (clear & TIOCM_RTS)
1294        rts = 0;
1295    if (clear & TIOCM_DTR)
1296        dtr = 0;
1297    MoxaPortLineCtrl(ch, dtr, rts);
1298    mutex_unlock(&moxa_openlock);
1299    return 0;
1300}
1301
1302static void moxa_set_termios(struct tty_struct *tty,
1303        struct ktermios *old_termios)
1304{
1305    struct moxa_port *ch = tty->driver_data;
1306
1307    if (ch == NULL)
1308        return;
1309    moxa_set_tty_param(tty, old_termios);
1310    if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1311        wake_up_interruptible(&ch->port.open_wait);
1312}
1313
1314static void moxa_stop(struct tty_struct *tty)
1315{
1316    struct moxa_port *ch = tty->driver_data;
1317
1318    if (ch == NULL)
1319        return;
1320    MoxaPortTxDisable(ch);
1321    set_bit(TXSTOPPED, &ch->statusflags);
1322}
1323
1324
1325static void moxa_start(struct tty_struct *tty)
1326{
1327    struct moxa_port *ch = tty->driver_data;
1328
1329    if (ch == NULL)
1330        return;
1331
1332    if (!test_bit(TXSTOPPED, &ch->statusflags))
1333        return;
1334
1335    MoxaPortTxEnable(ch);
1336    clear_bit(TXSTOPPED, &ch->statusflags);
1337}
1338
1339static void moxa_hangup(struct tty_struct *tty)
1340{
1341    struct moxa_port *ch = tty->driver_data;
1342    tty_port_hangup(&ch->port);
1343}
1344
1345static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd)
1346{
1347    struct tty_struct *tty;
1348    unsigned long flags;
1349    dcd = !!dcd;
1350
1351    spin_lock_irqsave(&p->port.lock, flags);
1352    if (dcd != p->DCDState) {
1353            p->DCDState = dcd;
1354            spin_unlock_irqrestore(&p->port.lock, flags);
1355        tty = tty_port_tty_get(&p->port);
1356        if (tty && C_CLOCAL(tty) && !dcd)
1357            tty_hangup(tty);
1358        tty_kref_put(tty);
1359    }
1360    else
1361        spin_unlock_irqrestore(&p->port.lock, flags);
1362}
1363
1364static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
1365        u16 __iomem *ip)
1366{
1367    struct tty_struct *tty = tty_port_tty_get(&p->port);
1368    void __iomem *ofsAddr;
1369    unsigned int inited = p->port.flags & ASYNC_INITIALIZED;
1370    u16 intr;
1371
1372    if (tty) {
1373        if (test_bit(EMPTYWAIT, &p->statusflags) &&
1374                MoxaPortTxQueue(p) == 0) {
1375            clear_bit(EMPTYWAIT, &p->statusflags);
1376            tty_wakeup(tty);
1377        }
1378        if (test_bit(LOWWAIT, &p->statusflags) && !tty->stopped &&
1379                MoxaPortTxQueue(p) <= WAKEUP_CHARS) {
1380            clear_bit(LOWWAIT, &p->statusflags);
1381            tty_wakeup(tty);
1382        }
1383
1384        if (inited && !test_bit(TTY_THROTTLED, &tty->flags) &&
1385                MoxaPortRxQueue(p) > 0) { /* RX */
1386            MoxaPortReadData(p);
1387            tty_schedule_flip(tty);
1388        }
1389    } else {
1390        clear_bit(EMPTYWAIT, &p->statusflags);
1391        MoxaPortFlushData(p, 0); /* flush RX */
1392    }
1393
1394    if (!handle) /* nothing else to do */
1395        goto put;
1396
1397    intr = readw(ip); /* port irq status */
1398    if (intr == 0)
1399        goto put;
1400
1401    writew(0, ip); /* ACK port */
1402    ofsAddr = p->tableAddr;
1403    if (intr & IntrTx) /* disable tx intr */
1404        writew(readw(ofsAddr + HostStat) & ~WakeupTx,
1405                ofsAddr + HostStat);
1406
1407    if (!inited)
1408        goto put;
1409
1410    if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */
1411        tty_insert_flip_char(tty, 0, TTY_BREAK);
1412        tty_schedule_flip(tty);
1413    }
1414
1415    if (intr & IntrLine)
1416        moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state);
1417put:
1418    tty_kref_put(tty);
1419
1420    return 0;
1421}
1422
1423static void moxa_poll(unsigned long ignored)
1424{
1425    struct moxa_board_conf *brd;
1426    u16 __iomem *ip;
1427    unsigned int card, port, served = 0;
1428
1429    spin_lock(&moxa_lock);
1430    for (card = 0; card < MAX_BOARDS; card++) {
1431        brd = &moxa_boards[card];
1432        if (!brd->ready)
1433            continue;
1434
1435        served++;
1436
1437        ip = NULL;
1438        if (readb(brd->intPend) == 0xff)
1439            ip = brd->intTable + readb(brd->intNdx);
1440
1441        for (port = 0; port < brd->numPorts; port++)
1442            moxa_poll_port(&brd->ports[port], !!ip, ip + port);
1443
1444        if (ip)
1445            writeb(0, brd->intPend); /* ACK */
1446
1447        if (moxaLowWaterChk) {
1448            struct moxa_port *p = brd->ports;
1449            for (port = 0; port < brd->numPorts; port++, p++)
1450                if (p->lowChkFlag) {
1451                    p->lowChkFlag = 0;
1452                    moxa_low_water_check(p->tableAddr);
1453                }
1454        }
1455    }
1456    moxaLowWaterChk = 0;
1457
1458    if (served)
1459        mod_timer(&moxaTimer, jiffies + HZ / 50);
1460    spin_unlock(&moxa_lock);
1461}
1462
1463/******************************************************************************/
1464
1465static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_termios)
1466{
1467    register struct ktermios *ts = tty->termios;
1468    struct moxa_port *ch = tty->driver_data;
1469    int rts, cts, txflow, rxflow, xany, baud;
1470
1471    rts = cts = txflow = rxflow = xany = 0;
1472    if (ts->c_cflag & CRTSCTS)
1473        rts = cts = 1;
1474    if (ts->c_iflag & IXON)
1475        txflow = 1;
1476    if (ts->c_iflag & IXOFF)
1477        rxflow = 1;
1478    if (ts->c_iflag & IXANY)
1479        xany = 1;
1480
1481    /* Clear the features we don't support */
1482    ts->c_cflag &= ~CMSPAR;
1483    MoxaPortFlowCtrl(ch, rts, cts, txflow, rxflow, xany);
1484    baud = MoxaPortSetTermio(ch, ts, tty_get_baud_rate(tty));
1485    if (baud == -1)
1486        baud = tty_termios_baud_rate(old_termios);
1487    /* Not put the baud rate into the termios data */
1488    tty_encode_baud_rate(tty, baud, baud);
1489}
1490
1491/*****************************************************************************
1492 * Driver level functions: *
1493 *****************************************************************************/
1494
1495static void MoxaPortFlushData(struct moxa_port *port, int mode)
1496{
1497    void __iomem *ofsAddr;
1498    if (mode < 0 || mode > 2)
1499        return;
1500    ofsAddr = port->tableAddr;
1501    moxafunc(ofsAddr, FC_FlushQueue, mode);
1502    if (mode != 1) {
1503        port->lowChkFlag = 0;
1504        moxa_low_water_check(ofsAddr);
1505    }
1506}
1507
1508/*
1509 * Moxa Port Number Description:
1510 *
1511 * MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And,
1512 * the port number using in MOXA driver functions will be 0 to 31 for
1513 * first MOXA board, 32 to 63 for second, 64 to 95 for third and 96
1514 * to 127 for fourth. For example, if you setup three MOXA boards,
1515 * first board is C218, second board is C320-16 and third board is
1516 * C320-32. The port number of first board (C218 - 8 ports) is from
1517 * 0 to 7. The port number of second board (C320 - 16 ports) is form
1518 * 32 to 47. The port number of third board (C320 - 32 ports) is from
1519 * 64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to
1520 * 127 will be invalid.
1521 *
1522 *
1523 * Moxa Functions Description:
1524 *
1525 * Function 1: Driver initialization routine, this routine must be
1526 * called when initialized driver.
1527 * Syntax:
1528 * void MoxaDriverInit();
1529 *
1530 *
1531 * Function 2: Moxa driver private IOCTL command processing.
1532 * Syntax:
1533 * int MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port);
1534 *
1535 * unsigned int cmd : IOCTL command
1536 * unsigned long arg : IOCTL argument
1537 * int port : port number (0 - 127)
1538 *
1539 * return: 0 (OK)
1540 * -EINVAL
1541 * -ENOIOCTLCMD
1542 *
1543 *
1544 * Function 6: Enable this port to start Tx/Rx data.
1545 * Syntax:
1546 * void MoxaPortEnable(int port);
1547 * int port : port number (0 - 127)
1548 *
1549 *
1550 * Function 7: Disable this port
1551 * Syntax:
1552 * void MoxaPortDisable(int port);
1553 * int port : port number (0 - 127)
1554 *
1555 *
1556 * Function 10: Setting baud rate of this port.
1557 * Syntax:
1558 * speed_t MoxaPortSetBaud(int port, speed_t baud);
1559 * int port : port number (0 - 127)
1560 * long baud : baud rate (50 - 115200)
1561 *
1562 * return: 0 : this port is invalid or baud < 50
1563 * 50 - 115200 : the real baud rate set to the port, if
1564 * the argument baud is large than maximun
1565 * available baud rate, the real setting
1566 * baud rate will be the maximun baud rate.
1567 *
1568 *
1569 * Function 12: Configure the port.
1570 * Syntax:
1571 * int MoxaPortSetTermio(int port, struct ktermios *termio, speed_t baud);
1572 * int port : port number (0 - 127)
1573 * struct ktermios * termio : termio structure pointer
1574 * speed_t baud : baud rate
1575 *
1576 * return: -1 : this port is invalid or termio == NULL
1577 * 0 : setting O.K.
1578 *
1579 *
1580 * Function 13: Get the DTR/RTS state of this port.
1581 * Syntax:
1582 * int MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);
1583 * int port : port number (0 - 127)
1584 * int * dtrState : pointer to INT to receive the current DTR
1585 * state. (if NULL, this function will not
1586 * write to this address)
1587 * int * rtsState : pointer to INT to receive the current RTS
1588 * state. (if NULL, this function will not
1589 * write to this address)
1590 *
1591 * return: -1 : this port is invalid
1592 * 0 : O.K.
1593 *
1594 *
1595 * Function 14: Setting the DTR/RTS output state of this port.
1596 * Syntax:
1597 * void MoxaPortLineCtrl(int port, int dtrState, int rtsState);
1598 * int port : port number (0 - 127)
1599 * int dtrState : DTR output state (0: off, 1: on)
1600 * int rtsState : RTS output state (0: off, 1: on)
1601 *
1602 *
1603 * Function 15: Setting the flow control of this port.
1604 * Syntax:
1605 * void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow,
1606 * int txFlow,int xany);
1607 * int port : port number (0 - 127)
1608 * int rtsFlow : H/W RTS flow control (0: no, 1: yes)
1609 * int ctsFlow : H/W CTS flow control (0: no, 1: yes)
1610 * int rxFlow : S/W Rx XON/XOFF flow control (0: no, 1: yes)
1611 * int txFlow : S/W Tx XON/XOFF flow control (0: no, 1: yes)
1612 * int xany : S/W XANY flow control (0: no, 1: yes)
1613 *
1614 *
1615 * Function 16: Get ths line status of this port
1616 * Syntax:
1617 * int MoxaPortLineStatus(int port);
1618 * int port : port number (0 - 127)
1619 *
1620 * return: Bit 0 - CTS state (0: off, 1: on)
1621 * Bit 1 - DSR state (0: off, 1: on)
1622 * Bit 2 - DCD state (0: off, 1: on)
1623 *
1624 *
1625 * Function 19: Flush the Rx/Tx buffer data of this port.
1626 * Syntax:
1627 * void MoxaPortFlushData(int port, int mode);
1628 * int port : port number (0 - 127)
1629 * int mode
1630 * 0 : flush the Rx buffer
1631 * 1 : flush the Tx buffer
1632 * 2 : flush the Rx and Tx buffer
1633 *
1634 *
1635 * Function 20: Write data.
1636 * Syntax:
1637 * int MoxaPortWriteData(int port, unsigned char * buffer, int length);
1638 * int port : port number (0 - 127)
1639 * unsigned char * buffer : pointer to write data buffer.
1640 * int length : write data length
1641 *
1642 * return: 0 - length : real write data length
1643 *
1644 *
1645 * Function 21: Read data.
1646 * Syntax:
1647 * int MoxaPortReadData(int port, struct tty_struct *tty);
1648 * int port : port number (0 - 127)
1649 * struct tty_struct *tty : tty for data
1650 *
1651 * return: 0 - length : real read data length
1652 *
1653 *
1654 * Function 24: Get the Tx buffer current queued data bytes
1655 * Syntax:
1656 * int MoxaPortTxQueue(int port);
1657 * int port : port number (0 - 127)
1658 *
1659 * return: .. : Tx buffer current queued data bytes
1660 *
1661 *
1662 * Function 25: Get the Tx buffer current free space
1663 * Syntax:
1664 * int MoxaPortTxFree(int port);
1665 * int port : port number (0 - 127)
1666 *
1667 * return: .. : Tx buffer current free space
1668 *
1669 *
1670 * Function 26: Get the Rx buffer current queued data bytes
1671 * Syntax:
1672 * int MoxaPortRxQueue(int port);
1673 * int port : port number (0 - 127)
1674 *
1675 * return: .. : Rx buffer current queued data bytes
1676 *
1677 *
1678 * Function 28: Disable port data transmission.
1679 * Syntax:
1680 * void MoxaPortTxDisable(int port);
1681 * int port : port number (0 - 127)
1682 *
1683 *
1684 * Function 29: Enable port data transmission.
1685 * Syntax:
1686 * void MoxaPortTxEnable(int port);
1687 * int port : port number (0 - 127)
1688 *
1689 *
1690 * Function 31: Get the received BREAK signal count and reset it.
1691 * Syntax:
1692 * int MoxaPortResetBrkCnt(int port);
1693 * int port : port number (0 - 127)
1694 *
1695 * return: 0 - .. : BREAK signal count
1696 *
1697 *
1698 */
1699
1700static void MoxaPortEnable(struct moxa_port *port)
1701{
1702    void __iomem *ofsAddr;
1703    u16 lowwater = 512;
1704
1705    ofsAddr = port->tableAddr;
1706    writew(lowwater, ofsAddr + Low_water);
1707    if (MOXA_IS_320(port->board))
1708        moxafunc(ofsAddr, FC_SetBreakIrq, 0);
1709    else
1710        writew(readw(ofsAddr + HostStat) | WakeupBreak,
1711                ofsAddr + HostStat);
1712
1713    moxafunc(ofsAddr, FC_SetLineIrq, Magic_code);
1714    moxafunc(ofsAddr, FC_FlushQueue, 2);
1715
1716    moxafunc(ofsAddr, FC_EnableCH, Magic_code);
1717    MoxaPortLineStatus(port);
1718}
1719
1720static void MoxaPortDisable(struct moxa_port *port)
1721{
1722    void __iomem *ofsAddr = port->tableAddr;
1723
1724    moxafunc(ofsAddr, FC_SetFlowCtl, 0); /* disable flow control */
1725    moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code);
1726    writew(0, ofsAddr + HostStat);
1727    moxafunc(ofsAddr, FC_DisableCH, Magic_code);
1728}
1729
1730static speed_t MoxaPortSetBaud(struct moxa_port *port, speed_t baud)
1731{
1732    void __iomem *ofsAddr = port->tableAddr;
1733    unsigned int clock, val;
1734    speed_t max;
1735
1736    max = MOXA_IS_320(port->board) ? 460800 : 921600;
1737    if (baud < 50)
1738        return 0;
1739    if (baud > max)
1740        baud = max;
1741    clock = 921600;
1742    val = clock / baud;
1743    moxafunc(ofsAddr, FC_SetBaud, val);
1744    baud = clock / val;
1745    return baud;
1746}
1747
1748static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio,
1749        speed_t baud)
1750{
1751    void __iomem *ofsAddr;
1752    tcflag_t mode = 0;
1753
1754    ofsAddr = port->tableAddr;
1755
1756    mode = termio->c_cflag & CSIZE;
1757    if (mode == CS5)
1758        mode = MX_CS5;
1759    else if (mode == CS6)
1760        mode = MX_CS6;
1761    else if (mode == CS7)
1762        mode = MX_CS7;
1763    else if (mode == CS8)
1764        mode = MX_CS8;
1765
1766    if (termio->c_cflag & CSTOPB) {
1767        if (mode == MX_CS5)
1768            mode |= MX_STOP15;
1769        else
1770            mode |= MX_STOP2;
1771    } else
1772        mode |= MX_STOP1;
1773
1774    if (termio->c_cflag & PARENB) {
1775        if (termio->c_cflag & PARODD)
1776            mode |= MX_PARODD;
1777        else
1778            mode |= MX_PAREVEN;
1779    } else
1780        mode |= MX_PARNONE;
1781
1782    moxafunc(ofsAddr, FC_SetDataMode, (u16)mode);
1783
1784    if (MOXA_IS_320(port->board) && baud >= 921600)
1785        return -1;
1786
1787    baud = MoxaPortSetBaud(port, baud);
1788
1789    if (termio->c_iflag & (IXON | IXOFF | IXANY)) {
1790            spin_lock_irq(&moxafunc_lock);
1791        writeb(termio->c_cc[VSTART], ofsAddr + FuncArg);
1792        writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1);
1793        writeb(FC_SetXonXoff, ofsAddr + FuncCode);
1794        moxa_wait_finish(ofsAddr);
1795        spin_unlock_irq(&moxafunc_lock);
1796
1797    }
1798    return baud;
1799}
1800
1801static int MoxaPortGetLineOut(struct moxa_port *port, int *dtrState,
1802        int *rtsState)
1803{
1804    if (dtrState)
1805        *dtrState = !!(port->lineCtrl & DTR_ON);
1806    if (rtsState)
1807        *rtsState = !!(port->lineCtrl & RTS_ON);
1808
1809    return 0;
1810}
1811
1812static void MoxaPortLineCtrl(struct moxa_port *port, int dtr, int rts)
1813{
1814    u8 mode = 0;
1815
1816    if (dtr)
1817        mode |= DTR_ON;
1818    if (rts)
1819        mode |= RTS_ON;
1820    port->lineCtrl = mode;
1821    moxafunc(port->tableAddr, FC_LineControl, mode);
1822}
1823
1824static void MoxaPortFlowCtrl(struct moxa_port *port, int rts, int cts,
1825        int txflow, int rxflow, int txany)
1826{
1827    int mode = 0;
1828
1829    if (rts)
1830        mode |= RTS_FlowCtl;
1831    if (cts)
1832        mode |= CTS_FlowCtl;
1833    if (txflow)
1834        mode |= Tx_FlowCtl;
1835    if (rxflow)
1836        mode |= Rx_FlowCtl;
1837    if (txany)
1838        mode |= IXM_IXANY;
1839    moxafunc(port->tableAddr, FC_SetFlowCtl, mode);
1840}
1841
1842static int MoxaPortLineStatus(struct moxa_port *port)
1843{
1844    void __iomem *ofsAddr;
1845    int val;
1846
1847    ofsAddr = port->tableAddr;
1848    if (MOXA_IS_320(port->board))
1849        val = moxafuncret(ofsAddr, FC_LineStatus, 0);
1850    else
1851        val = readw(ofsAddr + FlagStat) >> 4;
1852    val &= 0x0B;
1853    if (val & 8)
1854        val |= 4;
1855    moxa_new_dcdstate(port, val & 8);
1856    val &= 7;
1857    return val;
1858}
1859
1860static int MoxaPortWriteData(struct tty_struct *tty,
1861        const unsigned char *buffer, int len)
1862{
1863    struct moxa_port *port = tty->driver_data;
1864    void __iomem *baseAddr, *ofsAddr, *ofs;
1865    unsigned int c, total;
1866    u16 head, tail, tx_mask, spage, epage;
1867    u16 pageno, pageofs, bufhead;
1868
1869    ofsAddr = port->tableAddr;
1870    baseAddr = port->board->basemem;
1871    tx_mask = readw(ofsAddr + TX_mask);
1872    spage = readw(ofsAddr + Page_txb);
1873    epage = readw(ofsAddr + EndPage_txb);
1874    tail = readw(ofsAddr + TXwptr);
1875    head = readw(ofsAddr + TXrptr);
1876    c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask);
1877    if (c > len)
1878        c = len;
1879    moxaLog.txcnt[port->port.tty->index] += c;
1880    total = c;
1881    if (spage == epage) {
1882        bufhead = readw(ofsAddr + Ofs_txb);
1883        writew(spage, baseAddr + Control_reg);
1884        while (c > 0) {
1885            if (head > tail)
1886                len = head - tail - 1;
1887            else
1888                len = tx_mask + 1 - tail;
1889            len = (c > len) ? len : c;
1890            ofs = baseAddr + DynPage_addr + bufhead + tail;
1891            memcpy_toio(ofs, buffer, len);
1892            buffer += len;
1893            tail = (tail + len) & tx_mask;
1894            c -= len;
1895        }
1896    } else {
1897        pageno = spage + (tail >> 13);
1898        pageofs = tail & Page_mask;
1899        while (c > 0) {
1900            len = Page_size - pageofs;
1901            if (len > c)
1902                len = c;
1903            writeb(pageno, baseAddr + Control_reg);
1904            ofs = baseAddr + DynPage_addr + pageofs;
1905            memcpy_toio(ofs, buffer, len);
1906            buffer += len;
1907            if (++pageno == epage)
1908                pageno = spage;
1909            pageofs = 0;
1910            c -= len;
1911        }
1912        tail = (tail + total) & tx_mask;
1913    }
1914    writew(tail, ofsAddr + TXwptr);
1915    writeb(1, ofsAddr + CD180TXirq); /* start to send */
1916    return total;
1917}
1918
1919static int MoxaPortReadData(struct moxa_port *port)
1920{
1921    struct tty_struct *tty = port->port.tty;
1922    unsigned char *dst;
1923    void __iomem *baseAddr, *ofsAddr, *ofs;
1924    unsigned int count, len, total;
1925    u16 tail, rx_mask, spage, epage;
1926    u16 pageno, pageofs, bufhead, head;
1927
1928    ofsAddr = port->tableAddr;
1929    baseAddr = port->board->basemem;
1930    head = readw(ofsAddr + RXrptr);
1931    tail = readw(ofsAddr + RXwptr);
1932    rx_mask = readw(ofsAddr + RX_mask);
1933    spage = readw(ofsAddr + Page_rxb);
1934    epage = readw(ofsAddr + EndPage_rxb);
1935    count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1);
1936    if (count == 0)
1937        return 0;
1938
1939    total = count;
1940    moxaLog.rxcnt[tty->index] += total;
1941    if (spage == epage) {
1942        bufhead = readw(ofsAddr + Ofs_rxb);
1943        writew(spage, baseAddr + Control_reg);
1944        while (count > 0) {
1945            ofs = baseAddr + DynPage_addr + bufhead + head;
1946            len = (tail >= head) ? (tail - head) :
1947                    (rx_mask + 1 - head);
1948            len = tty_prepare_flip_string(tty, &dst,
1949                    min(len, count));
1950            memcpy_fromio(dst, ofs, len);
1951            head = (head + len) & rx_mask;
1952            count -= len;
1953        }
1954    } else {
1955        pageno = spage + (head >> 13);
1956        pageofs = head & Page_mask;
1957        while (count > 0) {
1958            writew(pageno, baseAddr + Control_reg);
1959            ofs = baseAddr + DynPage_addr + pageofs;
1960            len = tty_prepare_flip_string(tty, &dst,
1961                    min(Page_size - pageofs, count));
1962            memcpy_fromio(dst, ofs, len);
1963
1964            count -= len;
1965            pageofs = (pageofs + len) & Page_mask;
1966            if (pageofs == 0 && ++pageno == epage)
1967                pageno = spage;
1968        }
1969        head = (head + total) & rx_mask;
1970    }
1971    writew(head, ofsAddr + RXrptr);
1972    if (readb(ofsAddr + FlagStat) & Xoff_state) {
1973        moxaLowWaterChk = 1;
1974        port->lowChkFlag = 1;
1975    }
1976    return total;
1977}
1978
1979
1980static int MoxaPortTxQueue(struct moxa_port *port)
1981{
1982    void __iomem *ofsAddr = port->tableAddr;
1983    u16 rptr, wptr, mask;
1984
1985    rptr = readw(ofsAddr + TXrptr);
1986    wptr = readw(ofsAddr + TXwptr);
1987    mask = readw(ofsAddr + TX_mask);
1988    return (wptr - rptr) & mask;
1989}
1990
1991static int MoxaPortTxFree(struct moxa_port *port)
1992{
1993    void __iomem *ofsAddr = port->tableAddr;
1994    u16 rptr, wptr, mask;
1995
1996    rptr = readw(ofsAddr + TXrptr);
1997    wptr = readw(ofsAddr + TXwptr);
1998    mask = readw(ofsAddr + TX_mask);
1999    return mask - ((wptr - rptr) & mask);
2000}
2001
2002static int MoxaPortRxQueue(struct moxa_port *port)
2003{
2004    void __iomem *ofsAddr = port->tableAddr;
2005    u16 rptr, wptr, mask;
2006
2007    rptr = readw(ofsAddr + RXrptr);
2008    wptr = readw(ofsAddr + RXwptr);
2009    mask = readw(ofsAddr + RX_mask);
2010    return (wptr - rptr) & mask;
2011}
2012
2013static void MoxaPortTxDisable(struct moxa_port *port)
2014{
2015    moxafunc(port->tableAddr, FC_SetXoffState, Magic_code);
2016}
2017
2018static void MoxaPortTxEnable(struct moxa_port *port)
2019{
2020    moxafunc(port->tableAddr, FC_SetXonState, Magic_code);
2021}
2022
2023static int moxa_get_serial_info(struct moxa_port *info,
2024        struct serial_struct __user *retinfo)
2025{
2026    struct serial_struct tmp = {
2027        .type = info->type,
2028        .line = info->port.tty->index,
2029        .flags = info->port.flags,
2030        .baud_base = 921600,
2031        .close_delay = info->port.close_delay
2032    };
2033    return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
2034}
2035
2036
2037static int moxa_set_serial_info(struct moxa_port *info,
2038        struct serial_struct __user *new_info)
2039{
2040    struct serial_struct new_serial;
2041
2042    if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
2043        return -EFAULT;
2044
2045    if (new_serial.irq != 0 || new_serial.port != 0 ||
2046            new_serial.custom_divisor != 0 ||
2047            new_serial.baud_base != 921600)
2048        return -EPERM;
2049
2050    if (!capable(CAP_SYS_ADMIN)) {
2051        if (((new_serial.flags & ~ASYNC_USR_MASK) !=
2052             (info->port.flags & ~ASYNC_USR_MASK)))
2053            return -EPERM;
2054    } else
2055        info->port.close_delay = new_serial.close_delay * HZ / 100;
2056
2057    new_serial.flags = (new_serial.flags & ~ASYNC_FLAGS);
2058    new_serial.flags |= (info->port.flags & ASYNC_FLAGS);
2059
2060    MoxaSetFifo(info, new_serial.type == PORT_16550A);
2061
2062    info->type = new_serial.type;
2063    return 0;
2064}
2065
2066
2067
2068/*****************************************************************************
2069 * Static local functions: *
2070 *****************************************************************************/
2071
2072static void MoxaSetFifo(struct moxa_port *port, int enable)
2073{
2074    void __iomem *ofsAddr = port->tableAddr;
2075
2076    if (!enable) {
2077        moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0);
2078        moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1);
2079    } else {
2080        moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3);
2081        moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16);
2082    }
2083}
2084

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