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linuxdebug/drivers/tty/moxa.c

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2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0+
/*****************************************************************************/
/*
* moxa.c -- MOXA Intellio family multiport serial driver.
*
* Copyright (C) 1999-2000 Moxa Technologies (support@moxa.com).
* Copyright (c) 2007 Jiri Slaby <jirislaby@gmail.com>
*
* This code is loosely based on the Linux serial driver, written by
* Linus Torvalds, Theodore T'so and others.
*/
/*
* MOXA Intellio Series Driver
* for : LINUX
* date : 1999/1/7
* version : 5.1
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/errno.h>
#include <linux/firmware.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/serial.h>
#include <linux/tty_driver.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/slab.h>
#include <linux/ratelimit.h>
#include <asm/io.h>
#include <linux/uaccess.h>
#define MOXA 0x400
#define MOXA_GET_IQUEUE (MOXA + 1) /* get input buffered count */
#define MOXA_GET_OQUEUE (MOXA + 2) /* get output buffered count */
#define MOXA_GETDATACOUNT (MOXA + 23)
#define MOXA_GET_IOQUEUE (MOXA + 27)
#define MOXA_FLUSH_QUEUE (MOXA + 28)
#define MOXA_GETMSTATUS (MOXA + 65)
/*
* System Configuration
*/
#define Magic_code 0x404
/*
* for C218 BIOS initialization
*/
#define C218_ConfBase 0x800
#define C218_status (C218_ConfBase + 0) /* BIOS running status */
#define C218_diag (C218_ConfBase + 2) /* diagnostic status */
#define C218_key (C218_ConfBase + 4) /* WORD (0x218 for C218) */
#define C218DLoad_len (C218_ConfBase + 6) /* WORD */
#define C218check_sum (C218_ConfBase + 8) /* BYTE */
#define C218chksum_ok (C218_ConfBase + 0x0a) /* BYTE (1:ok) */
#define C218_TestRx (C218_ConfBase + 0x10) /* 8 bytes for 8 ports */
#define C218_TestTx (C218_ConfBase + 0x18) /* 8 bytes for 8 ports */
#define C218_RXerr (C218_ConfBase + 0x20) /* 8 bytes for 8 ports */
#define C218_ErrFlag (C218_ConfBase + 0x28) /* 8 bytes for 8 ports */
#define C218_LoadBuf 0x0F00
#define C218_KeyCode 0x218
#define CP204J_KeyCode 0x204
/*
* for C320 BIOS initialization
*/
#define C320_ConfBase 0x800
#define C320_LoadBuf 0x0f00
#define STS_init 0x05 /* for C320_status */
#define C320_status C320_ConfBase + 0 /* BIOS running status */
#define C320_diag C320_ConfBase + 2 /* diagnostic status */
#define C320_key C320_ConfBase + 4 /* WORD (0320H for C320) */
#define C320DLoad_len C320_ConfBase + 6 /* WORD */
#define C320check_sum C320_ConfBase + 8 /* WORD */
#define C320chksum_ok C320_ConfBase + 0x0a /* WORD (1:ok) */
#define C320bapi_len C320_ConfBase + 0x0c /* WORD */
#define C320UART_no C320_ConfBase + 0x0e /* WORD */
#define C320_KeyCode 0x320
#define FixPage_addr 0x0000 /* starting addr of static page */
#define DynPage_addr 0x2000 /* starting addr of dynamic page */
#define C218_start 0x3000 /* starting addr of C218 BIOS prg */
#define Control_reg 0x1ff0 /* select page and reset control */
#define HW_reset 0x80
/*
* Function Codes
*/
#define FC_CardReset 0x80
#define FC_ChannelReset 1 /* C320 firmware not supported */
#define FC_EnableCH 2
#define FC_DisableCH 3
#define FC_SetParam 4
#define FC_SetMode 5
#define FC_SetRate 6
#define FC_LineControl 7
#define FC_LineStatus 8
#define FC_XmitControl 9
#define FC_FlushQueue 10
#define FC_SendBreak 11
#define FC_StopBreak 12
#define FC_LoopbackON 13
#define FC_LoopbackOFF 14
#define FC_ClrIrqTable 15
#define FC_SendXon 16
#define FC_SetTermIrq 17 /* C320 firmware not supported */
#define FC_SetCntIrq 18 /* C320 firmware not supported */
#define FC_SetBreakIrq 19
#define FC_SetLineIrq 20
#define FC_SetFlowCtl 21
#define FC_GenIrq 22
#define FC_InCD180 23
#define FC_OutCD180 24
#define FC_InUARTreg 23
#define FC_OutUARTreg 24
#define FC_SetXonXoff 25
#define FC_OutCD180CCR 26
#define FC_ExtIQueue 27
#define FC_ExtOQueue 28
#define FC_ClrLineIrq 29
#define FC_HWFlowCtl 30
#define FC_GetClockRate 35
#define FC_SetBaud 36
#define FC_SetDataMode 41
#define FC_GetCCSR 43
#define FC_GetDataError 45
#define FC_RxControl 50
#define FC_ImmSend 51
#define FC_SetXonState 52
#define FC_SetXoffState 53
#define FC_SetRxFIFOTrig 54
#define FC_SetTxFIFOCnt 55
#define FC_UnixRate 56
#define FC_UnixResetTimer 57
#define RxFIFOTrig1 0
#define RxFIFOTrig4 1
#define RxFIFOTrig8 2
#define RxFIFOTrig14 3
/*
* Dual-Ported RAM
*/
#define DRAM_global 0
#define INT_data (DRAM_global + 0)
#define Config_base (DRAM_global + 0x108)
#define IRQindex (INT_data + 0)
#define IRQpending (INT_data + 4)
#define IRQtable (INT_data + 8)
/*
* Interrupt Status
*/
#define IntrRx 0x01 /* receiver data O.K. */
#define IntrTx 0x02 /* transmit buffer empty */
#define IntrFunc 0x04 /* function complete */
#define IntrBreak 0x08 /* received break */
#define IntrLine 0x10 /* line status change
for transmitter */
#define IntrIntr 0x20 /* received INTR code */
#define IntrQuit 0x40 /* received QUIT code */
#define IntrEOF 0x80 /* received EOF code */
#define IntrRxTrigger 0x100 /* rx data count reach trigger value */
#define IntrTxTrigger 0x200 /* tx data count below trigger value */
#define Magic_no (Config_base + 0)
#define Card_model_no (Config_base + 2)
#define Total_ports (Config_base + 4)
#define Module_cnt (Config_base + 8)
#define Module_no (Config_base + 10)
#define Timer_10ms (Config_base + 14)
#define Disable_IRQ (Config_base + 20)
#define TMS320_PORT1 (Config_base + 22)
#define TMS320_PORT2 (Config_base + 24)
#define TMS320_CLOCK (Config_base + 26)
/*
* DATA BUFFER in DRAM
*/
#define Extern_table 0x400 /* Base address of the external table
(24 words * 64) total 3K bytes
(24 words * 128) total 6K bytes */
#define Extern_size 0x60 /* 96 bytes */
#define RXrptr 0x00 /* read pointer for RX buffer */
#define RXwptr 0x02 /* write pointer for RX buffer */
#define TXrptr 0x04 /* read pointer for TX buffer */
#define TXwptr 0x06 /* write pointer for TX buffer */
#define HostStat 0x08 /* IRQ flag and general flag */
#define FlagStat 0x0A
#define FlowControl 0x0C /* B7 B6 B5 B4 B3 B2 B1 B0 */
/* x x x x | | | | */
/* | | | + CTS flow */
/* | | +--- RTS flow */
/* | +------ TX Xon/Xoff */
/* +--------- RX Xon/Xoff */
#define Break_cnt 0x0E /* received break count */
#define CD180TXirq 0x10 /* if non-0: enable TX irq */
#define RX_mask 0x12
#define TX_mask 0x14
#define Ofs_rxb 0x16
#define Ofs_txb 0x18
#define Page_rxb 0x1A
#define Page_txb 0x1C
#define EndPage_rxb 0x1E
#define EndPage_txb 0x20
#define Data_error 0x22
#define RxTrigger 0x28
#define TxTrigger 0x2a
#define rRXwptr 0x34
#define Low_water 0x36
#define FuncCode 0x40
#define FuncArg 0x42
#define FuncArg1 0x44
#define C218rx_size 0x2000 /* 8K bytes */
#define C218tx_size 0x8000 /* 32K bytes */
#define C218rx_mask (C218rx_size - 1)
#define C218tx_mask (C218tx_size - 1)
#define C320p8rx_size 0x2000
#define C320p8tx_size 0x8000
#define C320p8rx_mask (C320p8rx_size - 1)
#define C320p8tx_mask (C320p8tx_size - 1)
#define C320p16rx_size 0x2000
#define C320p16tx_size 0x4000
#define C320p16rx_mask (C320p16rx_size - 1)
#define C320p16tx_mask (C320p16tx_size - 1)
#define C320p24rx_size 0x2000
#define C320p24tx_size 0x2000
#define C320p24rx_mask (C320p24rx_size - 1)
#define C320p24tx_mask (C320p24tx_size - 1)
#define C320p32rx_size 0x1000
#define C320p32tx_size 0x1000
#define C320p32rx_mask (C320p32rx_size - 1)
#define C320p32tx_mask (C320p32tx_size - 1)
#define Page_size 0x2000U
#define Page_mask (Page_size - 1)
#define C218rx_spage 3
#define C218tx_spage 4
#define C218rx_pageno 1
#define C218tx_pageno 4
#define C218buf_pageno 5
#define C320p8rx_spage 3
#define C320p8tx_spage 4
#define C320p8rx_pgno 1
#define C320p8tx_pgno 4
#define C320p8buf_pgno 5
#define C320p16rx_spage 3
#define C320p16tx_spage 4
#define C320p16rx_pgno 1
#define C320p16tx_pgno 2
#define C320p16buf_pgno 3
#define C320p24rx_spage 3
#define C320p24tx_spage 4
#define C320p24rx_pgno 1
#define C320p24tx_pgno 1
#define C320p24buf_pgno 2
#define C320p32rx_spage 3
#define C320p32tx_ofs C320p32rx_size
#define C320p32tx_spage 3
#define C320p32buf_pgno 1
/*
* Host Status
*/
#define WakeupRx 0x01
#define WakeupTx 0x02
#define WakeupBreak 0x08
#define WakeupLine 0x10
#define WakeupIntr 0x20
#define WakeupQuit 0x40
#define WakeupEOF 0x80 /* used in VTIME control */
#define WakeupRxTrigger 0x100
#define WakeupTxTrigger 0x200
/*
* Flag status
*/
#define Rx_over 0x01
#define Xoff_state 0x02
#define Tx_flowOff 0x04
#define Tx_enable 0x08
#define CTS_state 0x10
#define DSR_state 0x20
#define DCD_state 0x80
/*
* FlowControl
*/
#define CTS_FlowCtl 1
#define RTS_FlowCtl 2
#define Tx_FlowCtl 4
#define Rx_FlowCtl 8
#define IXM_IXANY 0x10
#define LowWater 128
#define DTR_ON 1
#define RTS_ON 2
#define CTS_ON 1
#define DSR_ON 2
#define DCD_ON 8
/* mode definition */
#define MX_CS8 0x03
#define MX_CS7 0x02
#define MX_CS6 0x01
#define MX_CS5 0x00
#define MX_STOP1 0x00
#define MX_STOP15 0x04
#define MX_STOP2 0x08
#define MX_PARNONE 0x00
#define MX_PAREVEN 0x40
#define MX_PARODD 0xC0
#define MX_PARMARK 0xA0
#define MX_PARSPACE 0x20
#define MOXA_VERSION "6.0k"
#define MOXA_FW_HDRLEN 32
#define MOXAMAJOR 172
#define MAX_BOARDS 4 /* Don't change this value */
#define MAX_PORTS_PER_BOARD 32 /* Don't change this value */
#define MAX_PORTS (MAX_BOARDS * MAX_PORTS_PER_BOARD)
#define MOXA_IS_320(brd) ((brd)->boardType == MOXA_BOARD_C320_ISA || \
(brd)->boardType == MOXA_BOARD_C320_PCI)
/*
* Define the Moxa PCI vendor and device IDs.
*/
#define MOXA_BUS_TYPE_ISA 0
#define MOXA_BUS_TYPE_PCI 1
enum {
MOXA_BOARD_C218_PCI = 1,
MOXA_BOARD_C218_ISA,
MOXA_BOARD_C320_PCI,
MOXA_BOARD_C320_ISA,
MOXA_BOARD_CP204J,
};
static char *moxa_brdname[] =
{
"C218 Turbo PCI series",
"C218 Turbo ISA series",
"C320 Turbo PCI series",
"C320 Turbo ISA series",
"CP-204J series",
};
#ifdef CONFIG_PCI
static const struct pci_device_id moxa_pcibrds[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C218),
.driver_data = MOXA_BOARD_C218_PCI },
{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C320),
.driver_data = MOXA_BOARD_C320_PCI },
{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP204J),
.driver_data = MOXA_BOARD_CP204J },
{ 0 }
};
MODULE_DEVICE_TABLE(pci, moxa_pcibrds);
#endif /* CONFIG_PCI */
struct moxa_port;
static struct moxa_board_conf {
int boardType;
int numPorts;
int busType;
unsigned int ready;
struct moxa_port *ports;
void __iomem *basemem;
void __iomem *intNdx;
void __iomem *intPend;
void __iomem *intTable;
} moxa_boards[MAX_BOARDS];
struct mxser_mstatus {
tcflag_t cflag;
int cts;
int dsr;
int ri;
int dcd;
};
struct moxaq_str {
int inq;
int outq;
};
struct moxa_port {
struct tty_port port;
struct moxa_board_conf *board;
void __iomem *tableAddr;
int type;
int cflag;
unsigned long statusflags;
u8 DCDState; /* Protected by the port lock */
u8 lineCtrl;
u8 lowChkFlag;
};
struct mon_str {
int tick;
int rxcnt[MAX_PORTS];
int txcnt[MAX_PORTS];
};
/* statusflags */
#define TXSTOPPED 1
#define LOWWAIT 2
#define EMPTYWAIT 3
#define WAKEUP_CHARS 256
static int ttymajor = MOXAMAJOR;
static struct mon_str moxaLog;
static unsigned int moxaFuncTout = HZ / 2;
static unsigned int moxaLowWaterChk;
static DEFINE_MUTEX(moxa_openlock);
static DEFINE_SPINLOCK(moxa_lock);
static unsigned long baseaddr[MAX_BOARDS];
static unsigned int type[MAX_BOARDS];
static unsigned int numports[MAX_BOARDS];
static struct tty_port moxa_service_port;
MODULE_AUTHOR("William Chen");
MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver");
MODULE_LICENSE("GPL");
MODULE_FIRMWARE("c218tunx.cod");
MODULE_FIRMWARE("cp204unx.cod");
MODULE_FIRMWARE("c320tunx.cod");
module_param_array(type, uint, NULL, 0);
MODULE_PARM_DESC(type, "card type: C218=2, C320=4");
module_param_hw_array(baseaddr, ulong, ioport, NULL, 0);
MODULE_PARM_DESC(baseaddr, "base address");
module_param_array(numports, uint, NULL, 0);
MODULE_PARM_DESC(numports, "numports (ignored for C218)");
module_param(ttymajor, int, 0);
/*
* static functions:
*/
static int moxa_open(struct tty_struct *, struct file *);
static void moxa_close(struct tty_struct *, struct file *);
static int moxa_write(struct tty_struct *, const unsigned char *, int);
static unsigned int moxa_write_room(struct tty_struct *);
static void moxa_flush_buffer(struct tty_struct *);
static unsigned int moxa_chars_in_buffer(struct tty_struct *);
static void moxa_set_termios(struct tty_struct *, const struct ktermios *);
static void moxa_stop(struct tty_struct *);
static void moxa_start(struct tty_struct *);
static void moxa_hangup(struct tty_struct *);
static int moxa_tiocmget(struct tty_struct *tty);
static int moxa_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear);
static void moxa_poll(struct timer_list *);
static void moxa_set_tty_param(struct tty_struct *, const struct ktermios *);
static void moxa_shutdown(struct tty_port *);
static int moxa_carrier_raised(struct tty_port *);
static void moxa_dtr_rts(struct tty_port *, int);
/*
* moxa board interface functions:
*/
static void MoxaPortEnable(struct moxa_port *);
static void MoxaPortDisable(struct moxa_port *);
static int MoxaPortSetTermio(struct moxa_port *, struct ktermios *, speed_t);
static int MoxaPortGetLineOut(struct moxa_port *, int *, int *);
static void MoxaPortLineCtrl(struct moxa_port *, int, int);
static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int);
static int MoxaPortLineStatus(struct moxa_port *);
static void MoxaPortFlushData(struct moxa_port *, int);
static int MoxaPortWriteData(struct tty_struct *, const unsigned char *, int);
static int MoxaPortReadData(struct moxa_port *);
static unsigned int MoxaPortTxQueue(struct moxa_port *);
static int MoxaPortRxQueue(struct moxa_port *);
static unsigned int MoxaPortTxFree(struct moxa_port *);
static void MoxaPortTxDisable(struct moxa_port *);
static void MoxaPortTxEnable(struct moxa_port *);
static int moxa_get_serial_info(struct tty_struct *, struct serial_struct *);
static int moxa_set_serial_info(struct tty_struct *, struct serial_struct *);
static void MoxaSetFifo(struct moxa_port *port, int enable);
/*
* I/O functions
*/
static DEFINE_SPINLOCK(moxafunc_lock);
static void moxa_wait_finish(void __iomem *ofsAddr)
{
unsigned long end = jiffies + moxaFuncTout;
while (readw(ofsAddr + FuncCode) != 0)
if (time_after(jiffies, end))
return;
if (readw(ofsAddr + FuncCode) != 0)
printk_ratelimited(KERN_WARNING "moxa function expired\n");
}
static void moxafunc(void __iomem *ofsAddr, u16 cmd, u16 arg)
{
unsigned long flags;
spin_lock_irqsave(&moxafunc_lock, flags);
writew(arg, ofsAddr + FuncArg);
writew(cmd, ofsAddr + FuncCode);
moxa_wait_finish(ofsAddr);
spin_unlock_irqrestore(&moxafunc_lock, flags);
}
static int moxafuncret(void __iomem *ofsAddr, u16 cmd, u16 arg)
{
unsigned long flags;
u16 ret;
spin_lock_irqsave(&moxafunc_lock, flags);
writew(arg, ofsAddr + FuncArg);
writew(cmd, ofsAddr + FuncCode);
moxa_wait_finish(ofsAddr);
ret = readw(ofsAddr + FuncArg);
spin_unlock_irqrestore(&moxafunc_lock, flags);
return ret;
}
static void moxa_low_water_check(void __iomem *ofsAddr)
{
u16 rptr, wptr, mask, len;
if (readb(ofsAddr + FlagStat) & Xoff_state) {
rptr = readw(ofsAddr + RXrptr);
wptr = readw(ofsAddr + RXwptr);
mask = readw(ofsAddr + RX_mask);
len = (wptr - rptr) & mask;
if (len <= Low_water)
moxafunc(ofsAddr, FC_SendXon, 0);
}
}
/*
* TTY operations
*/
static int moxa_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
struct moxa_port *ch = tty->driver_data;
void __user *argp = (void __user *)arg;
int status, ret = 0;
if (tty->index == MAX_PORTS) {
if (cmd != MOXA_GETDATACOUNT && cmd != MOXA_GET_IOQUEUE &&
cmd != MOXA_GETMSTATUS)
return -EINVAL;
} else if (!ch)
return -ENODEV;
switch (cmd) {
case MOXA_GETDATACOUNT:
moxaLog.tick = jiffies;
if (copy_to_user(argp, &moxaLog, sizeof(moxaLog)))
ret = -EFAULT;
break;
case MOXA_FLUSH_QUEUE:
MoxaPortFlushData(ch, arg);
break;
case MOXA_GET_IOQUEUE: {
struct moxaq_str __user *argm = argp;
struct moxaq_str tmp;
struct moxa_port *p;
unsigned int i, j;
for (i = 0; i < MAX_BOARDS; i++) {
p = moxa_boards[i].ports;
for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
memset(&tmp, 0, sizeof(tmp));
spin_lock_bh(&moxa_lock);
if (moxa_boards[i].ready) {
tmp.inq = MoxaPortRxQueue(p);
tmp.outq = MoxaPortTxQueue(p);
}
spin_unlock_bh(&moxa_lock);
if (copy_to_user(argm, &tmp, sizeof(tmp)))
return -EFAULT;
}
}
break;
} case MOXA_GET_OQUEUE:
status = MoxaPortTxQueue(ch);
ret = put_user(status, (unsigned long __user *)argp);
break;
case MOXA_GET_IQUEUE:
status = MoxaPortRxQueue(ch);
ret = put_user(status, (unsigned long __user *)argp);
break;
case MOXA_GETMSTATUS: {
struct mxser_mstatus __user *argm = argp;
struct mxser_mstatus tmp;
struct moxa_port *p;
unsigned int i, j;
for (i = 0; i < MAX_BOARDS; i++) {
p = moxa_boards[i].ports;
for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
struct tty_struct *ttyp;
memset(&tmp, 0, sizeof(tmp));
spin_lock_bh(&moxa_lock);
if (!moxa_boards[i].ready) {
spin_unlock_bh(&moxa_lock);
goto copy;
}
status = MoxaPortLineStatus(p);
spin_unlock_bh(&moxa_lock);
if (status & 1)
tmp.cts = 1;
if (status & 2)
tmp.dsr = 1;
if (status & 4)
tmp.dcd = 1;
ttyp = tty_port_tty_get(&p->port);
if (!ttyp)
tmp.cflag = p->cflag;
else
tmp.cflag = ttyp->termios.c_cflag;
tty_kref_put(ttyp);
copy:
if (copy_to_user(argm, &tmp, sizeof(tmp)))
return -EFAULT;
}
}
break;
}
default:
ret = -ENOIOCTLCMD;
}
return ret;
}
static int moxa_break_ctl(struct tty_struct *tty, int state)
{
struct moxa_port *port = tty->driver_data;
moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak,
Magic_code);
return 0;
}
static const struct tty_operations moxa_ops = {
.open = moxa_open,
.close = moxa_close,
.write = moxa_write,
.write_room = moxa_write_room,
.flush_buffer = moxa_flush_buffer,
.chars_in_buffer = moxa_chars_in_buffer,
.ioctl = moxa_ioctl,
.set_termios = moxa_set_termios,
.stop = moxa_stop,
.start = moxa_start,
.hangup = moxa_hangup,
.break_ctl = moxa_break_ctl,
.tiocmget = moxa_tiocmget,
.tiocmset = moxa_tiocmset,
.set_serial = moxa_set_serial_info,
.get_serial = moxa_get_serial_info,
};
static const struct tty_port_operations moxa_port_ops = {
.carrier_raised = moxa_carrier_raised,
.dtr_rts = moxa_dtr_rts,
.shutdown = moxa_shutdown,
};
static struct tty_driver *moxaDriver;
static DEFINE_TIMER(moxaTimer, moxa_poll);
/*
* HW init
*/
static int moxa_check_fw_model(struct moxa_board_conf *brd, u8 model)
{
switch (brd->boardType) {
case MOXA_BOARD_C218_ISA:
case MOXA_BOARD_C218_PCI:
if (model != 1)
goto err;
break;
case MOXA_BOARD_CP204J:
if (model != 3)
goto err;
break;
default:
if (model != 2)
goto err;
break;
}
return 0;
err:
return -EINVAL;
}
static int moxa_check_fw(const void *ptr)
{
const __le16 *lptr = ptr;
if (*lptr != cpu_to_le16(0x7980))
return -EINVAL;
return 0;
}
static int moxa_load_bios(struct moxa_board_conf *brd, const u8 *buf,
size_t len)
{
void __iomem *baseAddr = brd->basemem;
u16 tmp;
writeb(HW_reset, baseAddr + Control_reg); /* reset */
msleep(10);
memset_io(baseAddr, 0, 4096);
memcpy_toio(baseAddr, buf, len); /* download BIOS */
writeb(0, baseAddr + Control_reg); /* restart */
msleep(2000);
switch (brd->boardType) {
case MOXA_BOARD_C218_ISA:
case MOXA_BOARD_C218_PCI:
tmp = readw(baseAddr + C218_key);
if (tmp != C218_KeyCode)
goto err;
break;
case MOXA_BOARD_CP204J:
tmp = readw(baseAddr + C218_key);
if (tmp != CP204J_KeyCode)
goto err;
break;
default:
tmp = readw(baseAddr + C320_key);
if (tmp != C320_KeyCode)
goto err;
tmp = readw(baseAddr + C320_status);
if (tmp != STS_init) {
printk(KERN_ERR "MOXA: bios upload failed -- CPU/Basic "
"module not found\n");
return -EIO;
}
break;
}
return 0;
err:
printk(KERN_ERR "MOXA: bios upload failed -- board not found\n");
return -EIO;
}
static int moxa_load_320b(struct moxa_board_conf *brd, const u8 *ptr,
size_t len)
{
void __iomem *baseAddr = brd->basemem;
if (len < 7168) {
printk(KERN_ERR "MOXA: invalid 320 bios -- too short\n");
return -EINVAL;
}
writew(len - 7168 - 2, baseAddr + C320bapi_len);
writeb(1, baseAddr + Control_reg); /* Select Page 1 */
memcpy_toio(baseAddr + DynPage_addr, ptr, 7168);
writeb(2, baseAddr + Control_reg); /* Select Page 2 */
memcpy_toio(baseAddr + DynPage_addr, ptr + 7168, len - 7168);
return 0;
}
static int moxa_real_load_code(struct moxa_board_conf *brd, const void *ptr,
size_t len)
{
void __iomem *baseAddr = brd->basemem;
const __le16 *uptr = ptr;
size_t wlen, len2, j;
unsigned long key, loadbuf, loadlen, checksum, checksum_ok;
unsigned int i, retry;
u16 usum, keycode;
keycode = (brd->boardType == MOXA_BOARD_CP204J) ? CP204J_KeyCode :
C218_KeyCode;
switch (brd->boardType) {
case MOXA_BOARD_CP204J:
case MOXA_BOARD_C218_ISA:
case MOXA_BOARD_C218_PCI:
key = C218_key;
loadbuf = C218_LoadBuf;
loadlen = C218DLoad_len;
checksum = C218check_sum;
checksum_ok = C218chksum_ok;
break;
default:
key = C320_key;
keycode = C320_KeyCode;
loadbuf = C320_LoadBuf;
loadlen = C320DLoad_len;
checksum = C320check_sum;
checksum_ok = C320chksum_ok;
break;
}
usum = 0;
wlen = len >> 1;
for (i = 0; i < wlen; i++)
usum += le16_to_cpu(uptr[i]);
retry = 0;
do {
wlen = len >> 1;
j = 0;
while (wlen) {
len2 = (wlen > 2048) ? 2048 : wlen;
wlen -= len2;
memcpy_toio(baseAddr + loadbuf, ptr + j, len2 << 1);
j += len2 << 1;
writew(len2, baseAddr + loadlen);
writew(0, baseAddr + key);
for (i = 0; i < 100; i++) {
if (readw(baseAddr + key) == keycode)
break;
msleep(10);
}
if (readw(baseAddr + key) != keycode)
return -EIO;
}
writew(0, baseAddr + loadlen);
writew(usum, baseAddr + checksum);
writew(0, baseAddr + key);
for (i = 0; i < 100; i++) {
if (readw(baseAddr + key) == keycode)
break;
msleep(10);
}
retry++;
} while ((readb(baseAddr + checksum_ok) != 1) && (retry < 3));
if (readb(baseAddr + checksum_ok) != 1)
return -EIO;
writew(0, baseAddr + key);
for (i = 0; i < 600; i++) {
if (readw(baseAddr + Magic_no) == Magic_code)
break;
msleep(10);
}
if (readw(baseAddr + Magic_no) != Magic_code)
return -EIO;
if (MOXA_IS_320(brd)) {
if (brd->busType == MOXA_BUS_TYPE_PCI) { /* ASIC board */
writew(0x3800, baseAddr + TMS320_PORT1);
writew(0x3900, baseAddr + TMS320_PORT2);
writew(28499, baseAddr + TMS320_CLOCK);
} else {
writew(0x3200, baseAddr + TMS320_PORT1);
writew(0x3400, baseAddr + TMS320_PORT2);
writew(19999, baseAddr + TMS320_CLOCK);
}
}
writew(1, baseAddr + Disable_IRQ);
writew(0, baseAddr + Magic_no);
for (i = 0; i < 500; i++) {
if (readw(baseAddr + Magic_no) == Magic_code)
break;
msleep(10);
}
if (readw(baseAddr + Magic_no) != Magic_code)
return -EIO;
if (MOXA_IS_320(brd)) {
j = readw(baseAddr + Module_cnt);
if (j <= 0)
return -EIO;
brd->numPorts = j * 8;
writew(j, baseAddr + Module_no);
writew(0, baseAddr + Magic_no);
for (i = 0; i < 600; i++) {
if (readw(baseAddr + Magic_no) == Magic_code)
break;
msleep(10);
}
if (readw(baseAddr + Magic_no) != Magic_code)
return -EIO;
}
brd->intNdx = baseAddr + IRQindex;
brd->intPend = baseAddr + IRQpending;
brd->intTable = baseAddr + IRQtable;
return 0;
}
static int moxa_load_code(struct moxa_board_conf *brd, const void *ptr,
size_t len)
{
void __iomem *ofsAddr, *baseAddr = brd->basemem;
struct moxa_port *port;
int retval, i;
if (len % 2) {
printk(KERN_ERR "MOXA: bios length is not even\n");
return -EINVAL;
}
retval = moxa_real_load_code(brd, ptr, len); /* may change numPorts */
if (retval)
return retval;
switch (brd->boardType) {
case MOXA_BOARD_C218_ISA:
case MOXA_BOARD_C218_PCI:
case MOXA_BOARD_CP204J:
port = brd->ports;
for (i = 0; i < brd->numPorts; i++, port++) {
port->board = brd;
port->DCDState = 0;
port->tableAddr = baseAddr + Extern_table +
Extern_size * i;
ofsAddr = port->tableAddr;
writew(C218rx_mask, ofsAddr + RX_mask);
writew(C218tx_mask, ofsAddr + TX_mask);
writew(C218rx_spage + i * C218buf_pageno, ofsAddr + Page_rxb);
writew(readw(ofsAddr + Page_rxb) + C218rx_pageno, ofsAddr + EndPage_rxb);
writew(C218tx_spage + i * C218buf_pageno, ofsAddr + Page_txb);
writew(readw(ofsAddr + Page_txb) + C218tx_pageno, ofsAddr + EndPage_txb);
}
break;
default:
port = brd->ports;
for (i = 0; i < brd->numPorts; i++, port++) {
port->board = brd;
port->DCDState = 0;
port->tableAddr = baseAddr + Extern_table +
Extern_size * i;
ofsAddr = port->tableAddr;
switch (brd->numPorts) {
case 8:
writew(C320p8rx_mask, ofsAddr + RX_mask);
writew(C320p8tx_mask, ofsAddr + TX_mask);
writew(C320p8rx_spage + i * C320p8buf_pgno, ofsAddr + Page_rxb);
writew(readw(ofsAddr + Page_rxb) + C320p8rx_pgno, ofsAddr + EndPage_rxb);
writew(C320p8tx_spage + i * C320p8buf_pgno, ofsAddr + Page_txb);
writew(readw(ofsAddr + Page_txb) + C320p8tx_pgno, ofsAddr + EndPage_txb);
break;
case 16:
writew(C320p16rx_mask, ofsAddr + RX_mask);
writew(C320p16tx_mask, ofsAddr + TX_mask);
writew(C320p16rx_spage + i * C320p16buf_pgno, ofsAddr + Page_rxb);
writew(readw(ofsAddr + Page_rxb) + C320p16rx_pgno, ofsAddr + EndPage_rxb);
writew(C320p16tx_spage + i * C320p16buf_pgno, ofsAddr + Page_txb);
writew(readw(ofsAddr + Page_txb) + C320p16tx_pgno, ofsAddr + EndPage_txb);
break;
case 24:
writew(C320p24rx_mask, ofsAddr + RX_mask);
writew(C320p24tx_mask, ofsAddr + TX_mask);
writew(C320p24rx_spage + i * C320p24buf_pgno, ofsAddr + Page_rxb);
writew(readw(ofsAddr + Page_rxb) + C320p24rx_pgno, ofsAddr + EndPage_rxb);
writew(C320p24tx_spage + i * C320p24buf_pgno, ofsAddr + Page_txb);
writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
break;
case 32:
writew(C320p32rx_mask, ofsAddr + RX_mask);
writew(C320p32tx_mask, ofsAddr + TX_mask);
writew(C320p32tx_ofs, ofsAddr + Ofs_txb);
writew(C320p32rx_spage + i * C320p32buf_pgno, ofsAddr + Page_rxb);
writew(readb(ofsAddr + Page_rxb), ofsAddr + EndPage_rxb);
writew(C320p32tx_spage + i * C320p32buf_pgno, ofsAddr + Page_txb);
writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
break;
}
}
break;
}
return 0;
}
static int moxa_load_fw(struct moxa_board_conf *brd, const struct firmware *fw)
{
const void *ptr = fw->data;
char rsn[64];
u16 lens[5];
size_t len;
unsigned int a, lenp, lencnt;
int ret = -EINVAL;
struct {
__le32 magic; /* 0x34303430 */
u8 reserved1[2];
u8 type; /* UNIX = 3 */
u8 model; /* C218T=1, C320T=2, CP204=3 */
u8 reserved2[8];
__le16 len[5];
} const *hdr = ptr;
BUILD_BUG_ON(ARRAY_SIZE(hdr->len) != ARRAY_SIZE(lens));
if (fw->size < MOXA_FW_HDRLEN) {
strcpy(rsn, "too short (even header won't fit)");
goto err;
}
if (hdr->magic != cpu_to_le32(0x30343034)) {
sprintf(rsn, "bad magic: %.8x", le32_to_cpu(hdr->magic));
goto err;
}
if (hdr->type != 3) {
sprintf(rsn, "not for linux, type is %u", hdr->type);
goto err;
}
if (moxa_check_fw_model(brd, hdr->model)) {
sprintf(rsn, "not for this card, model is %u", hdr->model);
goto err;
}
len = MOXA_FW_HDRLEN;
lencnt = hdr->model == 2 ? 5 : 3;
for (a = 0; a < ARRAY_SIZE(lens); a++) {
lens[a] = le16_to_cpu(hdr->len[a]);
if (lens[a] && len + lens[a] <= fw->size &&
moxa_check_fw(&fw->data[len]))
printk(KERN_WARNING "MOXA firmware: unexpected input "
"at offset %u, but going on\n", (u32)len);
if (!lens[a] && a < lencnt) {
sprintf(rsn, "too few entries in fw file");
goto err;
}
len += lens[a];
}
if (len != fw->size) {
sprintf(rsn, "bad length: %u (should be %u)", (u32)fw->size,
(u32)len);
goto err;
}
ptr += MOXA_FW_HDRLEN;
lenp = 0; /* bios */
strcpy(rsn, "read above");
ret = moxa_load_bios(brd, ptr, lens[lenp]);
if (ret)
goto err;
/* we skip the tty section (lens[1]), since we don't need it */
ptr += lens[lenp] + lens[lenp + 1];
lenp += 2; /* comm */
if (hdr->model == 2) {
ret = moxa_load_320b(brd, ptr, lens[lenp]);
if (ret)
goto err;
/* skip another tty */
ptr += lens[lenp] + lens[lenp + 1];
lenp += 2;
}
ret = moxa_load_code(brd, ptr, lens[lenp]);
if (ret)
goto err;
return 0;
err:
printk(KERN_ERR "firmware failed to load, reason: %s\n", rsn);
return ret;
}
static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev)
{
const struct firmware *fw;
const char *file;
struct moxa_port *p;
unsigned int i, first_idx;
int ret;
brd->ports = kcalloc(MAX_PORTS_PER_BOARD, sizeof(*brd->ports),
GFP_KERNEL);
if (brd->ports == NULL) {
printk(KERN_ERR "cannot allocate memory for ports\n");
ret = -ENOMEM;
goto err;
}
for (i = 0, p = brd->ports; i < MAX_PORTS_PER_BOARD; i++, p++) {
tty_port_init(&p->port);
p->port.ops = &moxa_port_ops;
p->type = PORT_16550A;
p->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
}
switch (brd->boardType) {
case MOXA_BOARD_C218_ISA:
case MOXA_BOARD_C218_PCI:
file = "c218tunx.cod";
break;
case MOXA_BOARD_CP204J:
file = "cp204unx.cod";
break;
default:
file = "c320tunx.cod";
break;
}
ret = request_firmware(&fw, file, dev);
if (ret) {
printk(KERN_ERR "MOXA: request_firmware failed. Make sure "
"you've placed '%s' file into your firmware "
"loader directory (e.g. /lib/firmware)\n",
file);
goto err_free;
}
ret = moxa_load_fw(brd, fw);
release_firmware(fw);
if (ret)
goto err_free;
spin_lock_bh(&moxa_lock);
brd->ready = 1;
if (!timer_pending(&moxaTimer))
mod_timer(&moxaTimer, jiffies + HZ / 50);
spin_unlock_bh(&moxa_lock);
first_idx = (brd - moxa_boards) * MAX_PORTS_PER_BOARD;
for (i = 0; i < brd->numPorts; i++)
tty_port_register_device(&brd->ports[i].port, moxaDriver,
first_idx + i, dev);
return 0;
err_free:
for (i = 0; i < MAX_PORTS_PER_BOARD; i++)
tty_port_destroy(&brd->ports[i].port);
kfree(brd->ports);
err:
return ret;
}
static void moxa_board_deinit(struct moxa_board_conf *brd)
{
unsigned int a, opened, first_idx;
mutex_lock(&moxa_openlock);
spin_lock_bh(&moxa_lock);
brd->ready = 0;
spin_unlock_bh(&moxa_lock);
/* pci hot-un-plug support */
for (a = 0; a < brd->numPorts; a++)
if (tty_port_initialized(&brd->ports[a].port))
tty_port_tty_hangup(&brd->ports[a].port, false);
for (a = 0; a < MAX_PORTS_PER_BOARD; a++)
tty_port_destroy(&brd->ports[a].port);
while (1) {
opened = 0;
for (a = 0; a < brd->numPorts; a++)
if (tty_port_initialized(&brd->ports[a].port))
opened++;
mutex_unlock(&moxa_openlock);
if (!opened)
break;
msleep(50);
mutex_lock(&moxa_openlock);
}
first_idx = (brd - moxa_boards) * MAX_PORTS_PER_BOARD;
for (a = 0; a < brd->numPorts; a++)
tty_unregister_device(moxaDriver, first_idx + a);
iounmap(brd->basemem);
brd->basemem = NULL;
kfree(brd->ports);
}
#ifdef CONFIG_PCI
static int moxa_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
struct moxa_board_conf *board;
unsigned int i;
int board_type = ent->driver_data;
int retval;
retval = pci_enable_device(pdev);
if (retval) {
dev_err(&pdev->dev, "can't enable pci device\n");
goto err;
}
for (i = 0; i < MAX_BOARDS; i++)
if (moxa_boards[i].basemem == NULL)
break;
retval = -ENODEV;
if (i >= MAX_BOARDS) {
dev_warn(&pdev->dev, "more than %u MOXA Intellio family boards "
"found. Board is ignored.\n", MAX_BOARDS);
goto err;
}
board = &moxa_boards[i];
retval = pci_request_region(pdev, 2, "moxa-base");
if (retval) {
dev_err(&pdev->dev, "can't request pci region 2\n");
goto err;
}
board->basemem = ioremap(pci_resource_start(pdev, 2), 0x4000);
if (board->basemem == NULL) {
dev_err(&pdev->dev, "can't remap io space 2\n");
retval = -ENOMEM;
goto err_reg;
}
board->boardType = board_type;
switch (board_type) {
case MOXA_BOARD_C218_ISA:
case MOXA_BOARD_C218_PCI:
board->numPorts = 8;
break;
case MOXA_BOARD_CP204J:
board->numPorts = 4;
break;
default:
board->numPorts = 0;
break;
}
board->busType = MOXA_BUS_TYPE_PCI;
retval = moxa_init_board(board, &pdev->dev);
if (retval)
goto err_base;
pci_set_drvdata(pdev, board);
dev_info(&pdev->dev, "board '%s' ready (%u ports, firmware loaded)\n",
moxa_brdname[board_type - 1], board->numPorts);
return 0;
err_base:
iounmap(board->basemem);
board->basemem = NULL;
err_reg:
pci_release_region(pdev, 2);
err:
return retval;
}
static void moxa_pci_remove(struct pci_dev *pdev)
{
struct moxa_board_conf *brd = pci_get_drvdata(pdev);
moxa_board_deinit(brd);
pci_release_region(pdev, 2);
}
static struct pci_driver moxa_pci_driver = {
.name = "moxa",
.id_table = moxa_pcibrds,
.probe = moxa_pci_probe,
.remove = moxa_pci_remove
};
#endif /* CONFIG_PCI */
static int __init moxa_init(void)
{
unsigned int isabrds = 0;
int retval = 0;
struct moxa_board_conf *brd = moxa_boards;
unsigned int i;
printk(KERN_INFO "MOXA Intellio family driver version %s\n",
MOXA_VERSION);
tty_port_init(&moxa_service_port);
moxaDriver = tty_alloc_driver(MAX_PORTS + 1,
TTY_DRIVER_REAL_RAW |
TTY_DRIVER_DYNAMIC_DEV);
if (IS_ERR(moxaDriver))
return PTR_ERR(moxaDriver);
moxaDriver->name = "ttyMX";
moxaDriver->major = ttymajor;
moxaDriver->minor_start = 0;
moxaDriver->type = TTY_DRIVER_TYPE_SERIAL;
moxaDriver->subtype = SERIAL_TYPE_NORMAL;
moxaDriver->init_termios = tty_std_termios;
moxaDriver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
moxaDriver->init_termios.c_ispeed = 9600;
moxaDriver->init_termios.c_ospeed = 9600;
tty_set_operations(moxaDriver, &moxa_ops);
/* Having one more port only for ioctls is ugly */
tty_port_link_device(&moxa_service_port, moxaDriver, MAX_PORTS);
if (tty_register_driver(moxaDriver)) {
printk(KERN_ERR "can't register MOXA Smartio tty driver!\n");
tty_driver_kref_put(moxaDriver);
return -1;
}
/* Find the boards defined from module args. */
for (i = 0; i < MAX_BOARDS; i++) {
if (!baseaddr[i])
break;
if (type[i] == MOXA_BOARD_C218_ISA ||
type[i] == MOXA_BOARD_C320_ISA) {
pr_debug("Moxa board %2d: %s board(baseAddr=%lx)\n",
isabrds + 1, moxa_brdname[type[i] - 1],
baseaddr[i]);
brd->boardType = type[i];
brd->numPorts = type[i] == MOXA_BOARD_C218_ISA ? 8 :
numports[i];
brd->busType = MOXA_BUS_TYPE_ISA;
brd->basemem = ioremap(baseaddr[i], 0x4000);
if (!brd->basemem) {
printk(KERN_ERR "MOXA: can't remap %lx\n",
baseaddr[i]);
continue;
}
if (moxa_init_board(brd, NULL)) {
iounmap(brd->basemem);
brd->basemem = NULL;
continue;
}
printk(KERN_INFO "MOXA isa board found at 0x%.8lx and "
"ready (%u ports, firmware loaded)\n",
baseaddr[i], brd->numPorts);
brd++;
isabrds++;
}
}
#ifdef CONFIG_PCI
retval = pci_register_driver(&moxa_pci_driver);
if (retval) {
printk(KERN_ERR "Can't register MOXA pci driver!\n");
if (isabrds)
retval = 0;
}
#endif
return retval;
}
static void __exit moxa_exit(void)
{
unsigned int i;
#ifdef CONFIG_PCI
pci_unregister_driver(&moxa_pci_driver);
#endif
for (i = 0; i < MAX_BOARDS; i++) /* ISA boards */
if (moxa_boards[i].ready)
moxa_board_deinit(&moxa_boards[i]);
del_timer_sync(&moxaTimer);
tty_unregister_driver(moxaDriver);
tty_driver_kref_put(moxaDriver);
}
module_init(moxa_init);
module_exit(moxa_exit);
static void moxa_shutdown(struct tty_port *port)
{
struct moxa_port *ch = container_of(port, struct moxa_port, port);
MoxaPortDisable(ch);
MoxaPortFlushData(ch, 2);
}
static int moxa_carrier_raised(struct tty_port *port)
{
struct moxa_port *ch = container_of(port, struct moxa_port, port);
int dcd;
spin_lock_irq(&port->lock);
dcd = ch->DCDState;
spin_unlock_irq(&port->lock);
return dcd;
}
static void moxa_dtr_rts(struct tty_port *port, int onoff)
{
struct moxa_port *ch = container_of(port, struct moxa_port, port);
MoxaPortLineCtrl(ch, onoff, onoff);
}
static int moxa_open(struct tty_struct *tty, struct file *filp)
{
struct moxa_board_conf *brd;
struct moxa_port *ch;
int port;
port = tty->index;
if (port == MAX_PORTS) {
return capable(CAP_SYS_ADMIN) ? 0 : -EPERM;
}
if (mutex_lock_interruptible(&moxa_openlock))
return -ERESTARTSYS;
brd = &moxa_boards[port / MAX_PORTS_PER_BOARD];
if (!brd->ready) {
mutex_unlock(&moxa_openlock);
return -ENODEV;
}
if (port % MAX_PORTS_PER_BOARD >= brd->numPorts) {
mutex_unlock(&moxa_openlock);
return -ENODEV;
}
ch = &brd->ports[port % MAX_PORTS_PER_BOARD];
ch->port.count++;
tty->driver_data = ch;
tty_port_tty_set(&ch->port, tty);
mutex_lock(&ch->port.mutex);
if (!tty_port_initialized(&ch->port)) {
ch->statusflags = 0;
moxa_set_tty_param(tty, &tty->termios);
MoxaPortLineCtrl(ch, 1, 1);
MoxaPortEnable(ch);
MoxaSetFifo(ch, ch->type == PORT_16550A);
tty_port_set_initialized(&ch->port, 1);
}
mutex_unlock(&ch->port.mutex);
mutex_unlock(&moxa_openlock);
return tty_port_block_til_ready(&ch->port, tty, filp);
}
static void moxa_close(struct tty_struct *tty, struct file *filp)
{
struct moxa_port *ch = tty->driver_data;
ch->cflag = tty->termios.c_cflag;
tty_port_close(&ch->port, tty, filp);
}
static int moxa_write(struct tty_struct *tty,
const unsigned char *buf, int count)
{
struct moxa_port *ch = tty->driver_data;
unsigned long flags;
int len;
if (ch == NULL)
return 0;
spin_lock_irqsave(&moxa_lock, flags);
len = MoxaPortWriteData(tty, buf, count);
spin_unlock_irqrestore(&moxa_lock, flags);
set_bit(LOWWAIT, &ch->statusflags);
return len;
}
static unsigned int moxa_write_room(struct tty_struct *tty)
{
struct moxa_port *ch;
if (tty->flow.stopped)
return 0;
ch = tty->driver_data;
if (ch == NULL)
return 0;
return MoxaPortTxFree(ch);
}
static void moxa_flush_buffer(struct tty_struct *tty)
{
struct moxa_port *ch = tty->driver_data;
if (ch == NULL)
return;
MoxaPortFlushData(ch, 1);
tty_wakeup(tty);
}
static unsigned int moxa_chars_in_buffer(struct tty_struct *tty)
{
struct moxa_port *ch = tty->driver_data;
unsigned int chars;
chars = MoxaPortTxQueue(ch);
if (chars)
/*
* Make it possible to wakeup anything waiting for output
* in tty_ioctl.c, etc.
*/
set_bit(EMPTYWAIT, &ch->statusflags);
return chars;
}
static int moxa_tiocmget(struct tty_struct *tty)
{
struct moxa_port *ch = tty->driver_data;
int flag = 0, dtr, rts;
MoxaPortGetLineOut(ch, &dtr, &rts);
if (dtr)
flag |= TIOCM_DTR;
if (rts)
flag |= TIOCM_RTS;
dtr = MoxaPortLineStatus(ch);
if (dtr & 1)
flag |= TIOCM_CTS;
if (dtr & 2)
flag |= TIOCM_DSR;
if (dtr & 4)
flag |= TIOCM_CD;
return flag;
}
static int moxa_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
struct moxa_port *ch;
int dtr, rts;
mutex_lock(&moxa_openlock);
ch = tty->driver_data;
if (!ch) {
mutex_unlock(&moxa_openlock);
return -EINVAL;
}
MoxaPortGetLineOut(ch, &dtr, &rts);
if (set & TIOCM_RTS)
rts = 1;
if (set & TIOCM_DTR)
dtr = 1;
if (clear & TIOCM_RTS)
rts = 0;
if (clear & TIOCM_DTR)
dtr = 0;
MoxaPortLineCtrl(ch, dtr, rts);
mutex_unlock(&moxa_openlock);
return 0;
}
static void moxa_set_termios(struct tty_struct *tty,
const struct ktermios *old_termios)
{
struct moxa_port *ch = tty->driver_data;
if (ch == NULL)
return;
moxa_set_tty_param(tty, old_termios);
if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
wake_up_interruptible(&ch->port.open_wait);
}
static void moxa_stop(struct tty_struct *tty)
{
struct moxa_port *ch = tty->driver_data;
if (ch == NULL)
return;
MoxaPortTxDisable(ch);
set_bit(TXSTOPPED, &ch->statusflags);
}
static void moxa_start(struct tty_struct *tty)
{
struct moxa_port *ch = tty->driver_data;
if (ch == NULL)
return;
if (!test_bit(TXSTOPPED, &ch->statusflags))
return;
MoxaPortTxEnable(ch);
clear_bit(TXSTOPPED, &ch->statusflags);
}
static void moxa_hangup(struct tty_struct *tty)
{
struct moxa_port *ch = tty->driver_data;
tty_port_hangup(&ch->port);
}
static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd)
{
unsigned long flags;
dcd = !!dcd;
spin_lock_irqsave(&p->port.lock, flags);
if (dcd != p->DCDState) {
p->DCDState = dcd;
spin_unlock_irqrestore(&p->port.lock, flags);
if (!dcd)
tty_port_tty_hangup(&p->port, true);
}
else
spin_unlock_irqrestore(&p->port.lock, flags);
}
static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
u16 __iomem *ip)
{
struct tty_struct *tty = tty_port_tty_get(&p->port);
void __iomem *ofsAddr;
unsigned int inited = tty_port_initialized(&p->port);
u16 intr;
if (tty) {
if (test_bit(EMPTYWAIT, &p->statusflags) &&
MoxaPortTxQueue(p) == 0) {
clear_bit(EMPTYWAIT, &p->statusflags);
tty_wakeup(tty);
}
if (test_bit(LOWWAIT, &p->statusflags) && !tty->flow.stopped &&
MoxaPortTxQueue(p) <= WAKEUP_CHARS) {
clear_bit(LOWWAIT, &p->statusflags);
tty_wakeup(tty);
}
if (inited && !tty_throttled(tty) &&
MoxaPortRxQueue(p) > 0) { /* RX */
MoxaPortReadData(p);
tty_flip_buffer_push(&p->port);
}
} else {
clear_bit(EMPTYWAIT, &p->statusflags);
MoxaPortFlushData(p, 0); /* flush RX */
}
if (!handle) /* nothing else to do */
goto put;
intr = readw(ip); /* port irq status */
if (intr == 0)
goto put;
writew(0, ip); /* ACK port */
ofsAddr = p->tableAddr;
if (intr & IntrTx) /* disable tx intr */
writew(readw(ofsAddr + HostStat) & ~WakeupTx,
ofsAddr + HostStat);
if (!inited)
goto put;
if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */
tty_insert_flip_char(&p->port, 0, TTY_BREAK);
tty_flip_buffer_push(&p->port);
}
if (intr & IntrLine)
moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state);
put:
tty_kref_put(tty);
return 0;
}
static void moxa_poll(struct timer_list *unused)
{
struct moxa_board_conf *brd;
u16 __iomem *ip;
unsigned int card, port, served = 0;
spin_lock(&moxa_lock);
for (card = 0; card < MAX_BOARDS; card++) {
brd = &moxa_boards[card];
if (!brd->ready)
continue;
served++;
ip = NULL;
if (readb(brd->intPend) == 0xff)
ip = brd->intTable + readb(brd->intNdx);
for (port = 0; port < brd->numPorts; port++)
moxa_poll_port(&brd->ports[port], !!ip, ip + port);
if (ip)
writeb(0, brd->intPend); /* ACK */
if (moxaLowWaterChk) {
struct moxa_port *p = brd->ports;
for (port = 0; port < brd->numPorts; port++, p++)
if (p->lowChkFlag) {
p->lowChkFlag = 0;
moxa_low_water_check(p->tableAddr);
}
}
}
moxaLowWaterChk = 0;
if (served)
mod_timer(&moxaTimer, jiffies + HZ / 50);
spin_unlock(&moxa_lock);
}
/******************************************************************************/
static void moxa_set_tty_param(struct tty_struct *tty,
const struct ktermios *old_termios)
{
register struct ktermios *ts = &tty->termios;
struct moxa_port *ch = tty->driver_data;
int rts, cts, txflow, rxflow, xany, baud;
rts = cts = txflow = rxflow = xany = 0;
if (ts->c_cflag & CRTSCTS)
rts = cts = 1;
if (ts->c_iflag & IXON)
txflow = 1;
if (ts->c_iflag & IXOFF)
rxflow = 1;
if (ts->c_iflag & IXANY)
xany = 1;
MoxaPortFlowCtrl(ch, rts, cts, txflow, rxflow, xany);
baud = MoxaPortSetTermio(ch, ts, tty_get_baud_rate(tty));
if (baud == -1)
baud = tty_termios_baud_rate(old_termios);
/* Not put the baud rate into the termios data */
tty_encode_baud_rate(tty, baud, baud);
}
/*****************************************************************************
* Driver level functions: *
*****************************************************************************/
static void MoxaPortFlushData(struct moxa_port *port, int mode)
{
void __iomem *ofsAddr;
if (mode < 0 || mode > 2)
return;
ofsAddr = port->tableAddr;
moxafunc(ofsAddr, FC_FlushQueue, mode);
if (mode != 1) {
port->lowChkFlag = 0;
moxa_low_water_check(ofsAddr);
}
}
/*
* Moxa Port Number Description:
*
* MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And,
* the port number using in MOXA driver functions will be 0 to 31 for
* first MOXA board, 32 to 63 for second, 64 to 95 for third and 96
* to 127 for fourth. For example, if you setup three MOXA boards,
* first board is C218, second board is C320-16 and third board is
* C320-32. The port number of first board (C218 - 8 ports) is from
* 0 to 7. The port number of second board (C320 - 16 ports) is form
* 32 to 47. The port number of third board (C320 - 32 ports) is from
* 64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to
* 127 will be invalid.
*
*
* Moxa Functions Description:
*
* Function 1: Driver initialization routine, this routine must be
* called when initialized driver.
* Syntax:
* void MoxaDriverInit();
*
*
* Function 2: Moxa driver private IOCTL command processing.
* Syntax:
* int MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port);
*
* unsigned int cmd : IOCTL command
* unsigned long arg : IOCTL argument
* int port : port number (0 - 127)
*
* return: 0 (OK)
* -EINVAL
* -ENOIOCTLCMD
*
*
* Function 6: Enable this port to start Tx/Rx data.
* Syntax:
* void MoxaPortEnable(int port);
* int port : port number (0 - 127)
*
*
* Function 7: Disable this port
* Syntax:
* void MoxaPortDisable(int port);
* int port : port number (0 - 127)
*
*
* Function 10: Setting baud rate of this port.
* Syntax:
* speed_t MoxaPortSetBaud(int port, speed_t baud);
* int port : port number (0 - 127)
* long baud : baud rate (50 - 115200)
*
* return: 0 : this port is invalid or baud < 50
* 50 - 115200 : the real baud rate set to the port, if
* the argument baud is large than maximun
* available baud rate, the real setting
* baud rate will be the maximun baud rate.
*
*
* Function 12: Configure the port.
* Syntax:
* int MoxaPortSetTermio(int port, struct ktermios *termio, speed_t baud);
* int port : port number (0 - 127)
* struct ktermios * termio : termio structure pointer
* speed_t baud : baud rate
*
* return: -1 : this port is invalid or termio == NULL
* 0 : setting O.K.
*
*
* Function 13: Get the DTR/RTS state of this port.
* Syntax:
* int MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);
* int port : port number (0 - 127)
* int * dtrState : pointer to INT to receive the current DTR
* state. (if NULL, this function will not
* write to this address)
* int * rtsState : pointer to INT to receive the current RTS
* state. (if NULL, this function will not
* write to this address)
*
* return: -1 : this port is invalid
* 0 : O.K.
*
*
* Function 14: Setting the DTR/RTS output state of this port.
* Syntax:
* void MoxaPortLineCtrl(int port, int dtrState, int rtsState);
* int port : port number (0 - 127)
* int dtrState : DTR output state (0: off, 1: on)
* int rtsState : RTS output state (0: off, 1: on)
*
*
* Function 15: Setting the flow control of this port.
* Syntax:
* void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow,
* int txFlow,int xany);
* int port : port number (0 - 127)
* int rtsFlow : H/W RTS flow control (0: no, 1: yes)
* int ctsFlow : H/W CTS flow control (0: no, 1: yes)
* int rxFlow : S/W Rx XON/XOFF flow control (0: no, 1: yes)
* int txFlow : S/W Tx XON/XOFF flow control (0: no, 1: yes)
* int xany : S/W XANY flow control (0: no, 1: yes)
*
*
* Function 16: Get ths line status of this port
* Syntax:
* int MoxaPortLineStatus(int port);
* int port : port number (0 - 127)
*
* return: Bit 0 - CTS state (0: off, 1: on)
* Bit 1 - DSR state (0: off, 1: on)
* Bit 2 - DCD state (0: off, 1: on)
*
*
* Function 19: Flush the Rx/Tx buffer data of this port.
* Syntax:
* void MoxaPortFlushData(int port, int mode);
* int port : port number (0 - 127)
* int mode
* 0 : flush the Rx buffer
* 1 : flush the Tx buffer
* 2 : flush the Rx and Tx buffer
*
*
* Function 20: Write data.
* Syntax:
* int MoxaPortWriteData(int port, unsigned char * buffer, int length);
* int port : port number (0 - 127)
* unsigned char * buffer : pointer to write data buffer.
* int length : write data length
*
* return: 0 - length : real write data length
*
*
* Function 21: Read data.
* Syntax:
* int MoxaPortReadData(int port, struct tty_struct *tty);
* int port : port number (0 - 127)
* struct tty_struct *tty : tty for data
*
* return: 0 - length : real read data length
*
*
* Function 24: Get the Tx buffer current queued data bytes
* Syntax:
* int MoxaPortTxQueue(int port);
* int port : port number (0 - 127)
*
* return: .. : Tx buffer current queued data bytes
*
*
* Function 25: Get the Tx buffer current free space
* Syntax:
* int MoxaPortTxFree(int port);
* int port : port number (0 - 127)
*
* return: .. : Tx buffer current free space
*
*
* Function 26: Get the Rx buffer current queued data bytes
* Syntax:
* int MoxaPortRxQueue(int port);
* int port : port number (0 - 127)
*
* return: .. : Rx buffer current queued data bytes
*
*
* Function 28: Disable port data transmission.
* Syntax:
* void MoxaPortTxDisable(int port);
* int port : port number (0 - 127)
*
*
* Function 29: Enable port data transmission.
* Syntax:
* void MoxaPortTxEnable(int port);
* int port : port number (0 - 127)
*
*
* Function 31: Get the received BREAK signal count and reset it.
* Syntax:
* int MoxaPortResetBrkCnt(int port);
* int port : port number (0 - 127)
*
* return: 0 - .. : BREAK signal count
*
*
*/
static void MoxaPortEnable(struct moxa_port *port)
{
void __iomem *ofsAddr;
u16 lowwater = 512;
ofsAddr = port->tableAddr;
writew(lowwater, ofsAddr + Low_water);
if (MOXA_IS_320(port->board))
moxafunc(ofsAddr, FC_SetBreakIrq, 0);
else
writew(readw(ofsAddr + HostStat) | WakeupBreak,
ofsAddr + HostStat);
moxafunc(ofsAddr, FC_SetLineIrq, Magic_code);
moxafunc(ofsAddr, FC_FlushQueue, 2);
moxafunc(ofsAddr, FC_EnableCH, Magic_code);
MoxaPortLineStatus(port);
}
static void MoxaPortDisable(struct moxa_port *port)
{
void __iomem *ofsAddr = port->tableAddr;
moxafunc(ofsAddr, FC_SetFlowCtl, 0); /* disable flow control */
moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code);
writew(0, ofsAddr + HostStat);
moxafunc(ofsAddr, FC_DisableCH, Magic_code);
}
static speed_t MoxaPortSetBaud(struct moxa_port *port, speed_t baud)
{
void __iomem *ofsAddr = port->tableAddr;
unsigned int clock, val;
speed_t max;
max = MOXA_IS_320(port->board) ? 460800 : 921600;
if (baud < 50)
return 0;
if (baud > max)
baud = max;
clock = 921600;
val = clock / baud;
moxafunc(ofsAddr, FC_SetBaud, val);
baud = clock / val;
return baud;
}
static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio,
speed_t baud)
{
void __iomem *ofsAddr;
tcflag_t mode = 0;
ofsAddr = port->tableAddr;
mode = termio->c_cflag & CSIZE;
if (mode == CS5)
mode = MX_CS5;
else if (mode == CS6)
mode = MX_CS6;
else if (mode == CS7)
mode = MX_CS7;
else if (mode == CS8)
mode = MX_CS8;
if (termio->c_cflag & CSTOPB) {
if (mode == MX_CS5)
mode |= MX_STOP15;
else
mode |= MX_STOP2;
} else
mode |= MX_STOP1;
if (termio->c_cflag & PARENB) {
if (termio->c_cflag & PARODD) {
if (termio->c_cflag & CMSPAR)
mode |= MX_PARMARK;
else
mode |= MX_PARODD;
} else {
if (termio->c_cflag & CMSPAR)
mode |= MX_PARSPACE;
else
mode |= MX_PAREVEN;
}
} else
mode |= MX_PARNONE;
moxafunc(ofsAddr, FC_SetDataMode, (u16)mode);
if (MOXA_IS_320(port->board) && baud >= 921600)
return -1;
baud = MoxaPortSetBaud(port, baud);
if (termio->c_iflag & (IXON | IXOFF | IXANY)) {
spin_lock_irq(&moxafunc_lock);
writeb(termio->c_cc[VSTART], ofsAddr + FuncArg);
writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1);
writeb(FC_SetXonXoff, ofsAddr + FuncCode);
moxa_wait_finish(ofsAddr);
spin_unlock_irq(&moxafunc_lock);
}
return baud;
}
static int MoxaPortGetLineOut(struct moxa_port *port, int *dtrState,
int *rtsState)
{
if (dtrState)
*dtrState = !!(port->lineCtrl & DTR_ON);
if (rtsState)
*rtsState = !!(port->lineCtrl & RTS_ON);
return 0;
}
static void MoxaPortLineCtrl(struct moxa_port *port, int dtr, int rts)
{
u8 mode = 0;
if (dtr)
mode |= DTR_ON;
if (rts)
mode |= RTS_ON;
port->lineCtrl = mode;
moxafunc(port->tableAddr, FC_LineControl, mode);
}
static void MoxaPortFlowCtrl(struct moxa_port *port, int rts, int cts,
int txflow, int rxflow, int txany)
{
int mode = 0;
if (rts)
mode |= RTS_FlowCtl;
if (cts)
mode |= CTS_FlowCtl;
if (txflow)
mode |= Tx_FlowCtl;
if (rxflow)
mode |= Rx_FlowCtl;
if (txany)
mode |= IXM_IXANY;
moxafunc(port->tableAddr, FC_SetFlowCtl, mode);
}
static int MoxaPortLineStatus(struct moxa_port *port)
{
void __iomem *ofsAddr;
int val;
ofsAddr = port->tableAddr;
if (MOXA_IS_320(port->board))
val = moxafuncret(ofsAddr, FC_LineStatus, 0);
else
val = readw(ofsAddr + FlagStat) >> 4;
val &= 0x0B;
if (val & 8)
val |= 4;
moxa_new_dcdstate(port, val & 8);
val &= 7;
return val;
}
static int MoxaPortWriteData(struct tty_struct *tty,
const unsigned char *buffer, int len)
{
struct moxa_port *port = tty->driver_data;
void __iomem *baseAddr, *ofsAddr, *ofs;
unsigned int c, total;
u16 head, tail, tx_mask, spage, epage;
u16 pageno, pageofs, bufhead;
ofsAddr = port->tableAddr;
baseAddr = port->board->basemem;
tx_mask = readw(ofsAddr + TX_mask);
spage = readw(ofsAddr + Page_txb);
epage = readw(ofsAddr + EndPage_txb);
tail = readw(ofsAddr + TXwptr);
head = readw(ofsAddr + TXrptr);
c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask);
if (c > len)
c = len;
moxaLog.txcnt[port->port.tty->index] += c;
total = c;
if (spage == epage) {
bufhead = readw(ofsAddr + Ofs_txb);
writew(spage, baseAddr + Control_reg);
while (c > 0) {
if (head > tail)
len = head - tail - 1;
else
len = tx_mask + 1 - tail;
len = (c > len) ? len : c;
ofs = baseAddr + DynPage_addr + bufhead + tail;
memcpy_toio(ofs, buffer, len);
buffer += len;
tail = (tail + len) & tx_mask;
c -= len;
}
} else {
pageno = spage + (tail >> 13);
pageofs = tail & Page_mask;
while (c > 0) {
len = Page_size - pageofs;
if (len > c)
len = c;
writeb(pageno, baseAddr + Control_reg);
ofs = baseAddr + DynPage_addr + pageofs;
memcpy_toio(ofs, buffer, len);
buffer += len;
if (++pageno == epage)
pageno = spage;
pageofs = 0;
c -= len;
}
tail = (tail + total) & tx_mask;
}
writew(tail, ofsAddr + TXwptr);
writeb(1, ofsAddr + CD180TXirq); /* start to send */
return total;
}
static int MoxaPortReadData(struct moxa_port *port)
{
struct tty_struct *tty = port->port.tty;
unsigned char *dst;
void __iomem *baseAddr, *ofsAddr, *ofs;
unsigned int count, len, total;
u16 tail, rx_mask, spage, epage;
u16 pageno, pageofs, bufhead, head;
ofsAddr = port->tableAddr;
baseAddr = port->board->basemem;
head = readw(ofsAddr + RXrptr);
tail = readw(ofsAddr + RXwptr);
rx_mask = readw(ofsAddr + RX_mask);
spage = readw(ofsAddr + Page_rxb);
epage = readw(ofsAddr + EndPage_rxb);
count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1);
if (count == 0)
return 0;
total = count;
moxaLog.rxcnt[tty->index] += total;
if (spage == epage) {
bufhead = readw(ofsAddr + Ofs_rxb);
writew(spage, baseAddr + Control_reg);
while (count > 0) {
ofs = baseAddr + DynPage_addr + bufhead + head;
len = (tail >= head) ? (tail - head) :
(rx_mask + 1 - head);
len = tty_prepare_flip_string(&port->port, &dst,
min(len, count));
memcpy_fromio(dst, ofs, len);
head = (head + len) & rx_mask;
count -= len;
}
} else {
pageno = spage + (head >> 13);
pageofs = head & Page_mask;
while (count > 0) {
writew(pageno, baseAddr + Control_reg);
ofs = baseAddr + DynPage_addr + pageofs;
len = tty_prepare_flip_string(&port->port, &dst,
min(Page_size - pageofs, count));
memcpy_fromio(dst, ofs, len);
count -= len;
pageofs = (pageofs + len) & Page_mask;
if (pageofs == 0 && ++pageno == epage)
pageno = spage;
}
head = (head + total) & rx_mask;
}
writew(head, ofsAddr + RXrptr);
if (readb(ofsAddr + FlagStat) & Xoff_state) {
moxaLowWaterChk = 1;
port->lowChkFlag = 1;
}
return total;
}
static unsigned int MoxaPortTxQueue(struct moxa_port *port)
{
void __iomem *ofsAddr = port->tableAddr;
u16 rptr, wptr, mask;
rptr = readw(ofsAddr + TXrptr);
wptr = readw(ofsAddr + TXwptr);
mask = readw(ofsAddr + TX_mask);
return (wptr - rptr) & mask;
}
static unsigned int MoxaPortTxFree(struct moxa_port *port)
{
void __iomem *ofsAddr = port->tableAddr;
u16 rptr, wptr, mask;
rptr = readw(ofsAddr + TXrptr);
wptr = readw(ofsAddr + TXwptr);
mask = readw(ofsAddr + TX_mask);
return mask - ((wptr - rptr) & mask);
}
static int MoxaPortRxQueue(struct moxa_port *port)
{
void __iomem *ofsAddr = port->tableAddr;
u16 rptr, wptr, mask;
rptr = readw(ofsAddr + RXrptr);
wptr = readw(ofsAddr + RXwptr);
mask = readw(ofsAddr + RX_mask);
return (wptr - rptr) & mask;
}
static void MoxaPortTxDisable(struct moxa_port *port)
{
moxafunc(port->tableAddr, FC_SetXoffState, Magic_code);
}
static void MoxaPortTxEnable(struct moxa_port *port)
{
moxafunc(port->tableAddr, FC_SetXonState, Magic_code);
}
static int moxa_get_serial_info(struct tty_struct *tty,
struct serial_struct *ss)
{
struct moxa_port *info = tty->driver_data;
if (tty->index == MAX_PORTS)
return -EINVAL;
if (!info)
return -ENODEV;
mutex_lock(&info->port.mutex);
ss->type = info->type;
ss->line = info->port.tty->index;
ss->flags = info->port.flags;
ss->baud_base = 921600;
ss->close_delay = jiffies_to_msecs(info->port.close_delay) / 10;
mutex_unlock(&info->port.mutex);
return 0;
}
static int moxa_set_serial_info(struct tty_struct *tty,
struct serial_struct *ss)
{
struct moxa_port *info = tty->driver_data;
unsigned int close_delay;
if (tty->index == MAX_PORTS)
return -EINVAL;
if (!info)
return -ENODEV;
close_delay = msecs_to_jiffies(ss->close_delay * 10);
mutex_lock(&info->port.mutex);
if (!capable(CAP_SYS_ADMIN)) {
if (close_delay != info->port.close_delay ||
ss->type != info->type ||
((ss->flags & ~ASYNC_USR_MASK) !=
(info->port.flags & ~ASYNC_USR_MASK))) {
mutex_unlock(&info->port.mutex);
return -EPERM;
}
} else {
info->port.close_delay = close_delay;
MoxaSetFifo(info, ss->type == PORT_16550A);
info->type = ss->type;
}
mutex_unlock(&info->port.mutex);
return 0;
}
/*****************************************************************************
* Static local functions: *
*****************************************************************************/
static void MoxaSetFifo(struct moxa_port *port, int enable)
{
void __iomem *ofsAddr = port->tableAddr;
if (!enable) {
moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0);
moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1);
} else {
moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3);
moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16);
}
}