/* * linux/drivers/char/riscom.c -- RISCom/8 multiport serial driver. * * Copyright (C) 1994-1996 Dmitry Gorodchanin (pgmdsg@ibi.com) * * This code is loosely based on the Linux serial driver, written by * Linus Torvalds, Theodore T'so and others. The RISCom/8 card * programming info was obtained from various drivers for other OSes * (FreeBSD, ISC, etc), but no source code from those drivers were * directly included in this driver. * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * Revision 1.1 * * ChangeLog: * Arnaldo Carvalho de Melo - 27-Jun-2001 * - get rid of check_region and several cleanups */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "riscom8.h" #include "riscom8_reg.h" /* Am I paranoid or not ? ;-) */ #define RISCOM_PARANOIA_CHECK /* * Crazy InteliCom/8 boards sometimes has swapped CTS & DSR signals. * You can slightly speed up things by #undefing the following option, * if you are REALLY sure that your board is correct one. */ #define RISCOM_BRAIN_DAMAGED_CTS /* * The following defines are mostly for testing purposes. But if you need * some nice reporting in your syslog, you can define them also. */ #undef RC_REPORT_FIFO #undef RC_REPORT_OVERRUN #define RISCOM_LEGAL_FLAGS \ (ASYNC_HUP_NOTIFY | ASYNC_SAK | ASYNC_SPLIT_TERMIOS | \ ASYNC_SPD_HI | ASYNC_SPEED_VHI | ASYNC_SESSION_LOCKOUT | \ ASYNC_PGRP_LOCKOUT | ASYNC_CALLOUT_NOHUP) #define RS_EVENT_WRITE_WAKEUP 0 static struct riscom_board * IRQ_to_board[16]; static struct tty_driver *riscom_driver; static struct riscom_board rc_board[RC_NBOARD] = { { .base = RC_IOBASE1, }, { .base = RC_IOBASE2, }, { .base = RC_IOBASE3, }, { .base = RC_IOBASE4, }, }; static struct riscom_port rc_port[RC_NBOARD * RC_NPORT]; /* RISCom/8 I/O ports addresses (without address translation) */ static unsigned short rc_ioport[] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0c, }; #define RC_NIOPORT ARRAY_SIZE(rc_ioport) static inline int rc_paranoia_check(struct riscom_port const * port, char *name, const char *routine) { #ifdef RISCOM_PARANOIA_CHECK static const char badmagic[] = KERN_INFO "rc: Warning: bad riscom port magic number for device %s in %s\n"; static const char badinfo[] = KERN_INFO "rc: Warning: null riscom port for device %s in %s\n"; if (!port) { printk(badinfo, name, routine); return 1; } if (port->magic != RISCOM8_MAGIC) { printk(badmagic, name, routine); return 1; } #endif return 0; } /* * * Service functions for RISCom/8 driver. * */ /* Get board number from pointer */ static inline int board_No (struct riscom_board const * bp) { return bp - rc_board; } /* Get port number from pointer */ static inline int port_No (struct riscom_port const * port) { return RC_PORT(port - rc_port); } /* Get pointer to board from pointer to port */ static inline struct riscom_board * port_Board(struct riscom_port const * port) { return &rc_board[RC_BOARD(port - rc_port)]; } /* Input Byte from CL CD180 register */ static inline unsigned char rc_in(struct riscom_board const * bp, unsigned short reg) { return inb(bp->base + RC_TO_ISA(reg)); } /* Output Byte to CL CD180 register */ static inline void rc_out(struct riscom_board const * bp, unsigned short reg, unsigned char val) { outb(val, bp->base + RC_TO_ISA(reg)); } /* Wait for Channel Command Register ready */ static inline void rc_wait_CCR(struct riscom_board const * bp) { unsigned long delay; for (delay = 100000; delay; delay--) if (!rc_in(bp, CD180_CCR)) return; printk(KERN_INFO "rc%d: Timeout waiting for CCR.\n", board_No(bp)); } /* * RISCom/8 probe functions. */ static inline int rc_request_io_range(struct riscom_board * const bp) { int i; for (i = 0; i < RC_NIOPORT; i++) if (!request_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1, "RISCom/8")) { goto out_release; } return 0; out_release: printk(KERN_INFO "rc%d: Skipping probe at 0x%03x. IO address in use.\n", board_No(bp), bp->base); while(--i >= 0) release_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1); return 1; } static inline void rc_release_io_range(struct riscom_board * const bp) { int i; for (i = 0; i < RC_NIOPORT; i++) release_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1); } /* Must be called with enabled interrupts */ static inline void rc_long_delay(unsigned long delay) { unsigned long i; for (i = jiffies + delay; time_after(i,jiffies); ) ; } /* Reset and setup CD180 chip */ static void __init rc_init_CD180(struct riscom_board const * bp) { unsigned long flags; save_flags(flags); cli(); rc_out(bp, RC_CTOUT, 0); /* Clear timeout */ rc_wait_CCR(bp); /* Wait for CCR ready */ rc_out(bp, CD180_CCR, CCR_HARDRESET); /* Reset CD180 chip */ sti(); rc_long_delay(HZ/20); /* Delay 0.05 sec */ cli(); rc_out(bp, CD180_GIVR, RC_ID); /* Set ID for this chip */ rc_out(bp, CD180_GICR, 0); /* Clear all bits */ rc_out(bp, CD180_PILR1, RC_ACK_MINT); /* Prio for modem intr */ rc_out(bp, CD180_PILR2, RC_ACK_TINT); /* Prio for transmitter intr */ rc_out(bp, CD180_PILR3, RC_ACK_RINT); /* Prio for receiver intr */ /* Setting up prescaler. We need 4 ticks per 1 ms */ rc_out(bp, CD180_PPRH, (RC_OSCFREQ/(1000000/RISCOM_TPS)) >> 8); rc_out(bp, CD180_PPRL, (RC_OSCFREQ/(1000000/RISCOM_TPS)) & 0xff); restore_flags(flags); } /* Main probing routine, also sets irq. */ static int __init rc_probe(struct riscom_board *bp) { unsigned char val1, val2; int irqs = 0; int retries; bp->irq = 0; if (rc_request_io_range(bp)) return 1; /* Are the I/O ports here ? */ rc_out(bp, CD180_PPRL, 0x5a); outb(0xff, 0x80); val1 = rc_in(bp, CD180_PPRL); rc_out(bp, CD180_PPRL, 0xa5); outb(0x00, 0x80); val2 = rc_in(bp, CD180_PPRL); if ((val1 != 0x5a) || (val2 != 0xa5)) { printk(KERN_ERR "rc%d: RISCom/8 Board at 0x%03x not found.\n", board_No(bp), bp->base); goto out_release; } /* It's time to find IRQ for this board */ for (retries = 0; retries < 5 && irqs <= 0; retries++) { irqs = probe_irq_on(); rc_init_CD180(bp); /* Reset CD180 chip */ rc_out(bp, CD180_CAR, 2); /* Select port 2 */ rc_wait_CCR(bp); rc_out(bp, CD180_CCR, CCR_TXEN); /* Enable transmitter */ rc_out(bp, CD180_IER, IER_TXRDY); /* Enable tx empty intr */ rc_long_delay(HZ/20); irqs = probe_irq_off(irqs); val1 = rc_in(bp, RC_BSR); /* Get Board Status reg */ val2 = rc_in(bp, RC_ACK_TINT); /* ACK interrupt */ rc_init_CD180(bp); /* Reset CD180 again */ if ((val1 & RC_BSR_TINT) || (val2 != (RC_ID | GIVR_IT_TX))) { printk(KERN_ERR "rc%d: RISCom/8 Board at 0x%03x not " "found.\n", board_No(bp), bp->base); goto out_release; } } if (irqs <= 0) { printk(KERN_ERR "rc%d: Can't find IRQ for RISCom/8 board " "at 0x%03x.\n", board_No(bp), bp->base); goto out_release; } bp->irq = irqs; bp->flags |= RC_BOARD_PRESENT; printk(KERN_INFO "rc%d: RISCom/8 Rev. %c board detected at " "0x%03x, IRQ %d.\n", board_No(bp), (rc_in(bp, CD180_GFRCR) & 0x0f) + 'A', /* Board revision */ bp->base, bp->irq); return 0; out_release: rc_release_io_range(bp); return 1; } /* * * Interrupt processing routines. * */ static inline void rc_mark_event(struct riscom_port * port, int event) { set_bit(event, &port->event); schedule_work(&port->tqueue); } static inline struct riscom_port * rc_get_port(struct riscom_board const * bp, unsigned char const * what) { unsigned char channel; struct riscom_port * port; channel = rc_in(bp, CD180_GICR) >> GICR_CHAN_OFF; if (channel < CD180_NCH) { port = &rc_port[board_No(bp) * RC_NPORT + channel]; if (port->flags & ASYNC_INITIALIZED) { return port; } } printk(KERN_ERR "rc%d: %s interrupt from invalid port %d\n", board_No(bp), what, channel); return NULL; } static inline void rc_receive_exc(struct riscom_board const * bp) { struct riscom_port *port; struct tty_struct *tty; unsigned char status; unsigned char ch, flag; if (!(port = rc_get_port(bp, "Receive"))) return; tty = port->tty; #ifdef RC_REPORT_OVERRUN status = rc_in(bp, CD180_RCSR); if (status & RCSR_OE) port->overrun++; status &= port->mark_mask; #else status = rc_in(bp, CD180_RCSR) & port->mark_mask; #endif ch = rc_in(bp, CD180_RDR); if (!status) { return; } if (status & RCSR_TOUT) { printk(KERN_WARNING "rc%d: port %d: Receiver timeout. " "Hardware problems ?\n", board_No(bp), port_No(port)); return; } else if (status & RCSR_BREAK) { printk(KERN_INFO "rc%d: port %d: Handling break...\n", board_No(bp), port_No(port)); flag = TTY_BREAK; if (port->flags & ASYNC_SAK) do_SAK(tty); } else if (status & RCSR_PE) flag = TTY_PARITY; else if (status & RCSR_FE) flag = TTY_FRAME; else if (status & RCSR_OE) flag = TTY_OVERRUN; else flag = TTY_NORMAL; tty_insert_flip_char(tty, ch, flag); tty_flip_buffer_push(tty); } static inline void rc_receive(struct riscom_board const * bp) { struct riscom_port *port; struct tty_struct *tty; unsigned char count; if (!(port = rc_get_port(bp, "Receive"))) return; tty = port->tty; count = rc_in(bp, CD180_RDCR); #ifdef RC_REPORT_FIFO port->hits[count > 8 ? 9 : count]++; #endif while (count--) { if (tty_buffer_request_room(tty, 1) == 0) { printk(KERN_WARNING "rc%d: port %d: Working around " "flip buffer overflow.\n", board_No(bp), port_No(port)); break; } tty_insert_flip_char(tty, rc_in(bp, CD180_RDR), TTY_NORMAL); } tty_flip_buffer_push(tty); } static inline void rc_transmit(struct riscom_board const * bp) { struct riscom_port *port; struct tty_struct *tty; unsigned char count; if (!(port = rc_get_port(bp, "Transmit"))) return; tty = port->tty; if (port->IER & IER_TXEMPTY) { /* FIFO drained */ rc_out(bp, CD180_CAR, port_No(port)); port->IER &= ~IER_TXEMPTY; rc_out(bp, CD180_IER, port->IER); return; } if ((port->xmit_cnt <= 0 && !port->break_length) || tty->stopped || tty->hw_stopped) { rc_out(bp, CD180_CAR, port_No(port)); port->IER &= ~IER_TXRDY; rc_out(bp, CD180_IER, port->IER); return; } if (port->break_length) { if (port->break_length > 0) { if (port->COR2 & COR2_ETC) { rc_out(bp, CD180_TDR, CD180_C_ESC); rc_out(bp, CD180_TDR, CD180_C_SBRK); port->COR2 &= ~COR2_ETC; } count = min_t(int, port->break_length, 0xff); rc_out(bp, CD180_TDR, CD180_C_ESC); rc_out(bp, CD180_TDR, CD180_C_DELAY); rc_out(bp, CD180_TDR, count); if (!(port->break_length -= count)) port->break_length--; } else { rc_out(bp, CD180_TDR, CD180_C_ESC); rc_out(bp, CD180_TDR, CD180_C_EBRK); rc_out(bp, CD180_COR2, port->COR2); rc_wait_CCR(bp); rc_out(bp, CD180_CCR, CCR_CORCHG2); port->break_length = 0; } return; } count = CD180_NFIFO; do { rc_out(bp, CD180_TDR, port->xmit_buf[port->xmit_tail++]); port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE-1); if (--port->xmit_cnt <= 0) break; } while (--count > 0); if (port->xmit_cnt <= 0) { rc_out(bp, CD180_CAR, port_No(port)); port->IER &= ~IER_TXRDY; rc_out(bp, CD180_IER, port->IER); } if (port->xmit_cnt <= port->wakeup_chars) rc_mark_event(port, RS_EVENT_WRITE_WAKEUP); } static inline void rc_check_modem(struct riscom_board const * bp) { struct riscom_port *port; struct tty_struct *tty; unsigned char mcr; if (!(port = rc_get_port(bp, "Modem"))) return; tty = port->tty; mcr = rc_in(bp, CD180_MCR); if (mcr & MCR_CDCHG) { if (rc_in(bp, CD180_MSVR) & MSVR_CD) wake_up_interruptible(&port->open_wait); else schedule_work(&port->tqueue_hangup); } #ifdef RISCOM_BRAIN_DAMAGED_CTS if (mcr & MCR_CTSCHG) { if (rc_in(bp, CD180_MSVR) & MSVR_CTS) { tty->hw_stopped = 0; port->IER |= IER_TXRDY; if (port->xmit_cnt <= port->wakeup_chars) rc_mark_event(port, RS_EVENT_WRITE_WAKEUP); } else { tty->hw_stopped = 1; port->IER &= ~IER_TXRDY; } rc_out(bp, CD180_IER, port->IER); } if (mcr & MCR_DSRCHG) { if (rc_in(bp, CD180_MSVR) & MSVR_DSR) { tty->hw_stopped = 0; port->IER |= IER_TXRDY; if (port->xmit_cnt <= port->wakeup_chars) rc_mark_event(port, RS_EVENT_WRITE_WAKEUP); } else { tty->hw_stopped = 1; port->IER &= ~IER_TXRDY; } rc_out(bp, CD180_IER, port->IER); } #endif /* RISCOM_BRAIN_DAMAGED_CTS */ /* Clear change bits */ rc_out(bp, CD180_MCR, 0); } /* The main interrupt processing routine */ static irqreturn_t rc_interrupt(int irq, void * dev_id) { unsigned char status; unsigned char ack; struct riscom_board *bp; unsigned long loop = 0; int handled = 0; bp = IRQ_to_board[irq]; if (!(bp->flags & RC_BOARD_ACTIVE)) return IRQ_NONE; while ((++loop < 16) && ((status = ~(rc_in(bp, RC_BSR))) & (RC_BSR_TOUT | RC_BSR_TINT | RC_BSR_MINT | RC_BSR_RINT))) { handled = 1; if (status & RC_BSR_TOUT) printk(KERN_WARNING "rc%d: Got timeout. Hardware " "error?\n", board_No(bp)); else if (status & RC_BSR_RINT) { ack = rc_in(bp, RC_ACK_RINT); if (ack == (RC_ID | GIVR_IT_RCV)) rc_receive(bp); else if (ack == (RC_ID | GIVR_IT_REXC)) rc_receive_exc(bp); else printk(KERN_WARNING "rc%d: Bad receive ack " "0x%02x.\n", board_No(bp), ack); } else if (status & RC_BSR_TINT) { ack = rc_in(bp, RC_ACK_TINT); if (ack == (RC_ID | GIVR_IT_TX)) rc_transmit(bp); else printk(KERN_WARNING "rc%d: Bad transmit ack " "0x%02x.\n", board_No(bp), ack); } else /* if (status & RC_BSR_MINT) */ { ack = rc_in(bp, RC_ACK_MINT); if (ack == (RC_ID | GIVR_IT_MODEM)) rc_check_modem(bp); else printk(KERN_WARNING "rc%d: Bad modem ack " "0x%02x.\n", board_No(bp), ack); } rc_out(bp, CD180_EOIR, 0); /* Mark end of interrupt */ rc_out(bp, RC_CTOUT, 0); /* Clear timeout flag */ } return IRQ_RETVAL(handled); } /* * Routines for open & close processing. */ /* Called with disabled interrupts */ static inline int rc_setup_board(struct riscom_board * bp) { int error; if (bp->flags & RC_BOARD_ACTIVE) return 0; error = request_irq(bp->irq, rc_interrupt, IRQF_DISABLED, "RISCom/8", NULL); if (error) return error; rc_out(bp, RC_CTOUT, 0); /* Just in case */ bp->DTR = ~0; rc_out(bp, RC_DTR, bp->DTR); /* Drop DTR on all ports */ IRQ_to_board[bp->irq] = bp; bp->flags |= RC_BOARD_ACTIVE; return 0; } /* Called with disabled interrupts */ static inline void rc_shutdown_board(struct riscom_board *bp) { if (!(bp->flags & RC_BOARD_ACTIVE)) return; bp->flags &= ~RC_BOARD_ACTIVE; free_irq(bp->irq, NULL); IRQ_to_board[bp->irq] = NULL; bp->DTR = ~0; rc_out(bp, RC_DTR, bp->DTR); /* Drop DTR on all ports */ } /* * Setting up port characteristics. * Must be called with disabled interrupts */ static void rc_change_speed(struct riscom_board *bp, struct riscom_port *port) { struct tty_struct *tty; unsigned long baud; long tmp; unsigned char cor1 = 0, cor3 = 0; unsigned char mcor1 = 0, mcor2 = 0; if (!(tty = port->tty) || !tty->termios) return; port->IER = 0; port->COR2 = 0; port->MSVR = MSVR_RTS; baud = tty_get_baud_rate(tty); /* Select port on the board */ rc_out(bp, CD180_CAR, port_No(port)); if (!baud) { /* Drop DTR & exit */ bp->DTR |= (1u << port_No(port)); rc_out(bp, RC_DTR, bp->DTR); return; } else { /* Set DTR on */ bp->DTR &= ~(1u << port_No(port)); rc_out(bp, RC_DTR, bp->DTR); } /* * Now we must calculate some speed depended things */ /* Set baud rate for port */ tmp = (((RC_OSCFREQ + baud/2) / baud + CD180_TPC/2) / CD180_TPC); rc_out(bp, CD180_RBPRH, (tmp >> 8) & 0xff); rc_out(bp, CD180_TBPRH, (tmp >> 8) & 0xff); rc_out(bp, CD180_RBPRL, tmp & 0xff); rc_out(bp, CD180_TBPRL, tmp & 0xff); baud = (baud + 5) / 10; /* Estimated CPS */ /* Two timer ticks seems enough to wakeup something like SLIP driver */ tmp = ((baud + HZ/2) / HZ) * 2 - CD180_NFIFO; port->wakeup_chars = (tmp < 0) ? 0 : ((tmp >= SERIAL_XMIT_SIZE) ? SERIAL_XMIT_SIZE - 1 : tmp); /* Receiver timeout will be transmission time for 1.5 chars */ tmp = (RISCOM_TPS + RISCOM_TPS/2 + baud/2) / baud; tmp = (tmp > 0xff) ? 0xff : tmp; rc_out(bp, CD180_RTPR, tmp); switch (C_CSIZE(tty)) { case CS5: cor1 |= COR1_5BITS; break; case CS6: cor1 |= COR1_6BITS; break; case CS7: cor1 |= COR1_7BITS; break; case CS8: cor1 |= COR1_8BITS; break; } if (C_CSTOPB(tty)) cor1 |= COR1_2SB; cor1 |= COR1_IGNORE; if (C_PARENB(tty)) { cor1 |= COR1_NORMPAR; if (C_PARODD(tty)) cor1 |= COR1_ODDP; if (I_INPCK(tty)) cor1 &= ~COR1_IGNORE; } /* Set marking of some errors */ port->mark_mask = RCSR_OE | RCSR_TOUT; if (I_INPCK(tty)) port->mark_mask |= RCSR_FE | RCSR_PE; if (I_BRKINT(tty) || I_PARMRK(tty)) port->mark_mask |= RCSR_BREAK; if (I_IGNPAR(tty)) port->mark_mask &= ~(RCSR_FE | RCSR_PE); if (I_IGNBRK(tty)) { port->mark_mask &= ~RCSR_BREAK; if (I_IGNPAR(tty)) /* Real raw mode. Ignore all */ port->mark_mask &= ~RCSR_OE; } /* Enable Hardware Flow Control */ if (C_CRTSCTS(tty)) { #ifdef RISCOM_BRAIN_DAMAGED_CTS port->IER |= IER_DSR | IER_CTS; mcor1 |= MCOR1_DSRZD | MCOR1_CTSZD; mcor2 |= MCOR2_DSROD | MCOR2_CTSOD; tty->hw_stopped = !(rc_in(bp, CD180_MSVR) & (MSVR_CTS|MSVR_DSR)); #else port->COR2 |= COR2_CTSAE; #endif } /* Some people reported that it works, but I still doubt */ if (I_IXON(tty)) { port->COR2 |= COR2_TXIBE; cor3 |= (COR3_FCT | COR3_SCDE); if (I_IXANY(tty)) port->COR2 |= COR2_IXM; rc_out(bp, CD180_SCHR1, START_CHAR(tty)); rc_out(bp, CD180_SCHR2, STOP_CHAR(tty)); rc_out(bp, CD180_SCHR3, START_CHAR(tty)); rc_out(bp, CD180_SCHR4, STOP_CHAR(tty)); } if (!C_CLOCAL(tty)) { /* Enable CD check */ port->IER |= IER_CD; mcor1 |= MCOR1_CDZD; mcor2 |= MCOR2_CDOD; } if (C_CREAD(tty)) /* Enable receiver */ port->IER |= IER_RXD; /* Set input FIFO size (1-8 bytes) */ cor3 |= RISCOM_RXFIFO; /* Setting up CD180 channel registers */ rc_out(bp, CD180_COR1, cor1); rc_out(bp, CD180_COR2, port->COR2); rc_out(bp, CD180_COR3, cor3); /* Make CD180 know about registers change */ rc_wait_CCR(bp); rc_out(bp, CD180_CCR, CCR_CORCHG1 | CCR_CORCHG2 | CCR_CORCHG3); /* Setting up modem option registers */ rc_out(bp, CD180_MCOR1, mcor1); rc_out(bp, CD180_MCOR2, mcor2); /* Enable CD180 transmitter & receiver */ rc_wait_CCR(bp); rc_out(bp, CD180_CCR, CCR_TXEN | CCR_RXEN); /* Enable interrupts */ rc_out(bp, CD180_IER, port->IER); /* And finally set RTS on */ rc_out(bp, CD180_MSVR, port->MSVR); } /* Must be called with interrupts enabled */ static int rc_setup_port(struct riscom_board *bp, struct riscom_port *port) { unsigned long flags; if (port->flags & ASYNC_INITIALIZED) return 0; if (!port->xmit_buf) { /* We may sleep in get_zeroed_page() */ unsigned long tmp; if (!(tmp = get_zeroed_page(GFP_KERNEL))) return -ENOMEM; if (port->xmit_buf) { free_page(tmp); return -ERESTARTSYS; } port->xmit_buf = (unsigned char *) tmp; } save_flags(flags); cli(); if (port->tty) clear_bit(TTY_IO_ERROR, &port->tty->flags); if (port->count == 1) bp->count++; port->xmit_cnt = port->xmit_head = port->xmit_tail = 0; rc_change_speed(bp, port); port->flags |= ASYNC_INITIALIZED; restore_flags(flags); return 0; } /* Must be called with interrupts disabled */ static void rc_shutdown_port(struct riscom_board *bp, struct riscom_port *port) { struct tty_struct *tty; if (!(port->flags & ASYNC_INITIALIZED)) return; #ifdef RC_REPORT_OVERRUN printk(KERN_INFO "rc%d: port %d: Total %ld overruns were detected.\n", board_No(bp), port_No(port), port->overrun); #endif #ifdef RC_REPORT_FIFO { int i; printk(KERN_INFO "rc%d: port %d: FIFO hits [ ", board_No(bp), port_No(port)); for (i = 0; i < 10; i++) { printk("%ld ", port->hits[i]); } printk("].\n"); } #endif if (port->xmit_buf) { free_page((unsigned long) port->xmit_buf); port->xmit_buf = NULL; } if (!(tty = port->tty) || C_HUPCL(tty)) { /* Drop DTR */ bp->DTR |= (1u << port_No(port)); rc_out(bp, RC_DTR, bp->DTR); } /* Select port */ rc_out(bp, CD180_CAR, port_No(port)); /* Reset port */ rc_wait_CCR(bp); rc_out(bp, CD180_CCR, CCR_SOFTRESET); /* Disable all interrupts from this port */ port->IER = 0; rc_out(bp, CD180_IER, port->IER); if (tty) set_bit(TTY_IO_ERROR, &tty->flags); port->flags &= ~ASYNC_INITIALIZED; if (--bp->count < 0) { printk(KERN_INFO "rc%d: rc_shutdown_port: " "bad board count: %d\n", board_No(bp), bp->count); bp->count = 0; } /* * If this is the last opened port on the board * shutdown whole board */ if (!bp->count) rc_shutdown_board(bp); } static int block_til_ready(struct tty_struct *tty, struct file * filp, struct riscom_port *port) { DECLARE_WAITQUEUE(wait, current); struct riscom_board *bp = port_Board(port); int retval; int do_clocal = 0; int CD; /* * If the device is in the middle of being closed, then block * until it's done, and then try again. */ if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) { interruptible_sleep_on(&port->close_wait); if (port->flags & ASYNC_HUP_NOTIFY) return -EAGAIN; else return -ERESTARTSYS; } /* * If non-blocking mode is set, or the port is not enabled, * then make the check up front and then exit. */ if ((filp->f_flags & O_NONBLOCK) || (tty->flags & (1 << TTY_IO_ERROR))) { port->flags |= ASYNC_NORMAL_ACTIVE; return 0; } if (C_CLOCAL(tty)) do_clocal = 1; /* * Block waiting for the carrier detect and the line to become * free (i.e., not in use by the callout). While we are in * this loop, info->count is dropped by one, so that * rs_close() knows when to free things. We restore it upon * exit, either normal or abnormal. */ retval = 0; add_wait_queue(&port->open_wait, &wait); cli(); if (!tty_hung_up_p(filp)) port->count--; sti(); port->blocked_open++; while (1) { cli(); rc_out(bp, CD180_CAR, port_No(port)); CD = rc_in(bp, CD180_MSVR) & MSVR_CD; rc_out(bp, CD180_MSVR, MSVR_RTS); bp->DTR &= ~(1u << port_No(port)); rc_out(bp, RC_DTR, bp->DTR); sti(); set_current_state(TASK_INTERRUPTIBLE); if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) { if (port->flags & ASYNC_HUP_NOTIFY) retval = -EAGAIN; else retval = -ERESTARTSYS; break; } if (!(port->flags & ASYNC_CLOSING) && (do_clocal || CD)) break; if (signal_pending(current)) { retval = -ERESTARTSYS; break; } schedule(); } __set_current_state(TASK_RUNNING); remove_wait_queue(&port->open_wait, &wait); if (!tty_hung_up_p(filp)) port->count++; port->blocked_open--; if (retval) return retval; port->flags |= ASYNC_NORMAL_ACTIVE; return 0; } static int rc_open(struct tty_struct * tty, struct file * filp) { int board; int error; struct riscom_port * port; struct riscom_board * bp; board = RC_BOARD(tty->index); if (board >= RC_NBOARD || !(rc_board[board].flags & RC_BOARD_PRESENT)) return -ENODEV; bp = &rc_board[board]; port = rc_port + board * RC_NPORT + RC_PORT(tty->index); if (rc_paranoia_check(port, tty->name, "rc_open")) return -ENODEV; if ((error = rc_setup_board(bp))) return error; port->count++; tty->driver_data = port; port->tty = tty; if ((error = rc_setup_port(bp, port))) return error; if ((error = block_til_ready(tty, filp, port))) return error; return 0; } static void rc_close(struct tty_struct * tty, struct file * filp) { struct riscom_port *port = (struct riscom_port *) tty->driver_data; struct riscom_board *bp; unsigned long flags; unsigned long timeout; if (!port || rc_paranoia_check(port, tty->name, "close")) return; save_flags(flags); cli(); if (tty_hung_up_p(filp)) goto out; bp = port_Board(port); if ((tty->count == 1) && (port->count != 1)) { printk(KERN_INFO "rc%d: rc_close: bad port count;" " tty->count is 1, port count is %d\n", board_No(bp), port->count); port->count = 1; } if (--port->count < 0) { printk(KERN_INFO "rc%d: rc_close: bad port count " "for tty%d: %d\n", board_No(bp), port_No(port), port->count); port->count = 0; } if (port->count) goto out; port->flags |= ASYNC_CLOSING; /* * Now we wait for the transmit buffer to clear; and we notify * the line discipline to only process XON/XOFF characters. */ tty->closing = 1; if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) tty_wait_until_sent(tty, port->closing_wait); /* * At this point we stop accepting input. To do this, we * disable the receive line status interrupts, and tell the * interrupt driver to stop checking the data ready bit in the * line status register. */ port->IER &= ~IER_RXD; if (port->flags & ASYNC_INITIALIZED) { port->IER &= ~IER_TXRDY; port->IER |= IER_TXEMPTY; rc_out(bp, CD180_CAR, port_No(port)); rc_out(bp, CD180_IER, port->IER); /* * Before we drop DTR, make sure the UART transmitter * has completely drained; this is especially * important if there is a transmit FIFO! */ timeout = jiffies+HZ; while(port->IER & IER_TXEMPTY) { msleep_interruptible(jiffies_to_msecs(port->timeout)); if (time_after(jiffies, timeout)) break; } } rc_shutdown_port(bp, port); if (tty->driver->flush_buffer) tty->driver->flush_buffer(tty); tty_ldisc_flush(tty); tty->closing = 0; port->event = 0; port->tty = NULL; if (port->blocked_open) { if (port->close_delay) { msleep_interruptible(jiffies_to_msecs(port->close_delay)); } wake_up_interruptible(&port->open_wait); } port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); wake_up_interruptible(&port->close_wait); out: restore_flags(flags); } static int rc_write(struct tty_struct * tty, const unsigned char *buf, int count) { struct riscom_port *port = (struct riscom_port *)tty->driver_data; struct riscom_board *bp; int c, total = 0; unsigned long flags; if (rc_paranoia_check(port, tty->name, "rc_write")) return 0; bp = port_Board(port); if (!tty || !port->xmit_buf) return 0; save_flags(flags); while (1) { cli(); c = min_t(int, count, min(SERIAL_XMIT_SIZE - port->xmit_cnt - 1, SERIAL_XMIT_SIZE - port->xmit_head)); if (c <= 0) { restore_flags(flags); break; } memcpy(port->xmit_buf + port->xmit_head, buf, c); port->xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE-1); port->xmit_cnt += c; restore_flags(flags); buf += c; count -= c; total += c; } cli(); if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped && !(port->IER & IER_TXRDY)) { port->IER |= IER_TXRDY; rc_out(bp, CD180_CAR, port_No(port)); rc_out(bp, CD180_IER, port->IER); } restore_flags(flags); return total; } static void rc_put_char(struct tty_struct * tty, unsigned char ch) { struct riscom_port *port = (struct riscom_port *)tty->driver_data; unsigned long flags; if (rc_paranoia_check(port, tty->name, "rc_put_char")) return; if (!tty || !port->xmit_buf) return; save_flags(flags); cli(); if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1) goto out; port->xmit_buf[port->xmit_head++] = ch; port->xmit_head &= SERIAL_XMIT_SIZE - 1; port->xmit_cnt++; out: restore_flags(flags); } static void rc_flush_chars(struct tty_struct * tty) { struct riscom_port *port = (struct riscom_port *)tty->driver_data; unsigned long flags; if (rc_paranoia_check(port, tty->name, "rc_flush_chars")) return; if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || !port->xmit_buf) return; save_flags(flags); cli(); port->IER |= IER_TXRDY; rc_out(port_Board(port), CD180_CAR, port_No(port)); rc_out(port_Board(port), CD180_IER, port->IER); restore_flags(flags); } static int rc_write_room(struct tty_struct * tty) { struct riscom_port *port = (struct riscom_port *)tty->driver_data; int ret; if (rc_paranoia_check(port, tty->name, "rc_write_room")) return 0; ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1; if (ret < 0) ret = 0; return ret; } static int rc_chars_in_buffer(struct tty_struct *tty) { struct riscom_port *port = (struct riscom_port *)tty->driver_data; if (rc_paranoia_check(port, tty->name, "rc_chars_in_buffer")) return 0; return port->xmit_cnt; } static void rc_flush_buffer(struct tty_struct *tty) { struct riscom_port *port = (struct riscom_port *)tty->driver_data; unsigned long flags; if (rc_paranoia_check(port, tty->name, "rc_flush_buffer")) return; save_flags(flags); cli(); port->xmit_cnt = port->xmit_head = port->xmit_tail = 0; restore_flags(flags); tty_wakeup(tty); } static int rc_tiocmget(struct tty_struct *tty, struct file *file) { struct riscom_port *port = (struct riscom_port *)tty->driver_data; struct riscom_board * bp; unsigned char status; unsigned int result; unsigned long flags; if (rc_paranoia_check(port, tty->name, __FUNCTION__)) return -ENODEV; bp = port_Board(port); save_flags(flags); cli(); rc_out(bp, CD180_CAR, port_No(port)); status = rc_in(bp, CD180_MSVR); result = rc_in(bp, RC_RI) & (1u << port_No(port)) ? 0 : TIOCM_RNG; restore_flags(flags); result |= ((status & MSVR_RTS) ? TIOCM_RTS : 0) | ((status & MSVR_DTR) ? TIOCM_DTR : 0) | ((status & MSVR_CD) ? TIOCM_CAR : 0) | ((status & MSVR_DSR) ? TIOCM_DSR : 0) | ((status & MSVR_CTS) ? TIOCM_CTS : 0); return result; } static int rc_tiocmset(struct tty_struct *tty, struct file *file, unsigned int set, unsigned int clear) { struct riscom_port *port = (struct riscom_port *)tty->driver_data; unsigned long flags; struct riscom_board *bp; if (rc_paranoia_check(port, tty->name, __FUNCTION__)) return -ENODEV; bp = port_Board(port); save_flags(flags); cli(); if (set & TIOCM_RTS) port->MSVR |= MSVR_RTS; if (set & TIOCM_DTR) bp->DTR &= ~(1u << port_No(port)); if (clear & TIOCM_RTS) port->MSVR &= ~MSVR_RTS; if (clear & TIOCM_DTR) bp->DTR |= (1u << port_No(port)); rc_out(bp, CD180_CAR, port_No(port)); rc_out(bp, CD180_MSVR, port->MSVR); rc_out(bp, RC_DTR, bp->DTR); restore_flags(flags); return 0; } static inline void rc_send_break(struct riscom_port * port, unsigned long length) { struct riscom_board *bp = port_Board(port); unsigned long flags; save_flags(flags); cli(); port->break_length = RISCOM_TPS / HZ * length; port->COR2 |= COR2_ETC; port->IER |= IER_TXRDY; rc_out(bp, CD180_CAR, port_No(port)); rc_out(bp, CD180_COR2, port->COR2); rc_out(bp, CD180_IER, port->IER); rc_wait_CCR(bp); rc_out(bp, CD180_CCR, CCR_CORCHG2); rc_wait_CCR(bp); restore_flags(flags); } static inline int rc_set_serial_info(struct riscom_port * port, struct serial_struct __user * newinfo) { struct serial_struct tmp; struct riscom_board *bp = port_Board(port); int change_speed; unsigned long flags; if (copy_from_user(&tmp, newinfo, sizeof(tmp))) return -EFAULT; change_speed = ((port->flags & ASYNC_SPD_MASK) != (tmp.flags & ASYNC_SPD_MASK)); if (!capable(CAP_SYS_ADMIN)) { if ((tmp.close_delay != port->close_delay) || (tmp.closing_wait != port->closing_wait) || ((tmp.flags & ~ASYNC_USR_MASK) != (port->flags & ~ASYNC_USR_MASK))) return -EPERM; port->flags = ((port->flags & ~ASYNC_USR_MASK) | (tmp.flags & ASYNC_USR_MASK)); } else { port->flags = ((port->flags & ~ASYNC_FLAGS) | (tmp.flags & ASYNC_FLAGS)); port->close_delay = tmp.close_delay; port->closing_wait = tmp.closing_wait; } if (change_speed) { save_flags(flags); cli(); rc_change_speed(bp, port); restore_flags(flags); } return 0; } static inline int rc_get_serial_info(struct riscom_port * port, struct serial_struct __user *retinfo) { struct serial_struct tmp; struct riscom_board *bp = port_Board(port); memset(&tmp, 0, sizeof(tmp)); tmp.type = PORT_CIRRUS; tmp.line = port - rc_port; tmp.port = bp->base; tmp.irq = bp->irq; tmp.flags = port->flags; tmp.baud_base = (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC; tmp.close_delay = port->close_delay * HZ/100; tmp.closing_wait = port->closing_wait * HZ/100; tmp.xmit_fifo_size = CD180_NFIFO; return copy_to_user(retinfo, &tmp, sizeof(tmp)) ? -EFAULT : 0; } static int rc_ioctl(struct tty_struct * tty, struct file * filp, unsigned int cmd, unsigned long arg) { struct riscom_port *port = (struct riscom_port *)tty->driver_data; void __user *argp = (void __user *)arg; int retval; if (rc_paranoia_check(port, tty->name, "rc_ioctl")) return -ENODEV; switch (cmd) { case TCSBRK: /* SVID version: non-zero arg --> no break */ retval = tty_check_change(tty); if (retval) return retval; tty_wait_until_sent(tty, 0); if (!arg) rc_send_break(port, HZ/4); /* 1/4 second */ break; case TCSBRKP: /* support for POSIX tcsendbreak() */ retval = tty_check_change(tty); if (retval) return retval; tty_wait_until_sent(tty, 0); rc_send_break(port, arg ? arg*(HZ/10) : HZ/4); break; case TIOCGSOFTCAR: return put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned __user *)argp); case TIOCSSOFTCAR: if (get_user(arg,(unsigned __user *) argp)) return -EFAULT; tty->termios->c_cflag = ((tty->termios->c_cflag & ~CLOCAL) | (arg ? CLOCAL : 0)); break; case TIOCGSERIAL: return rc_get_serial_info(port, argp); case TIOCSSERIAL: return rc_set_serial_info(port, argp); default: return -ENOIOCTLCMD; } return 0; } static void rc_throttle(struct tty_struct * tty) { struct riscom_port *port = (struct riscom_port *)tty->driver_data; struct riscom_board *bp; unsigned long flags; if (rc_paranoia_check(port, tty->name, "rc_throttle")) return; bp = port_Board(port); save_flags(flags); cli(); port->MSVR &= ~MSVR_RTS; rc_out(bp, CD180_CAR, port_No(port)); if (I_IXOFF(tty)) { rc_wait_CCR(bp); rc_out(bp, CD180_CCR, CCR_SSCH2); rc_wait_CCR(bp); } rc_out(bp, CD180_MSVR, port->MSVR); restore_flags(flags); } static void rc_unthrottle(struct tty_struct * tty) { struct riscom_port *port = (struct riscom_port *)tty->driver_data; struct riscom_board *bp; unsigned long flags; if (rc_paranoia_check(port, tty->name, "rc_unthrottle")) return; bp = port_Board(port); save_flags(flags); cli(); port->MSVR |= MSVR_RTS; rc_out(bp, CD180_CAR, port_No(port)); if (I_IXOFF(tty)) { rc_wait_CCR(bp); rc_out(bp, CD180_CCR, CCR_SSCH1); rc_wait_CCR(bp); } rc_out(bp, CD180_MSVR, port->MSVR); restore_flags(flags); } static void rc_stop(struct tty_struct * tty) { struct riscom_port *port = (struct riscom_port *)tty->driver_data; struct riscom_board *bp; unsigned long flags; if (rc_paranoia_check(port, tty->name, "rc_stop")) return; bp = port_Board(port); save_flags(flags); cli(); port->IER &= ~IER_TXRDY; rc_out(bp, CD180_CAR, port_No(port)); rc_out(bp, CD180_IER, port->IER); restore_flags(flags); } static void rc_start(struct tty_struct * tty) { struct riscom_port *port = (struct riscom_port *)tty->driver_data; struct riscom_board *bp; unsigned long flags; if (rc_paranoia_check(port, tty->name, "rc_start")) return; bp = port_Board(port); save_flags(flags); cli(); if (port->xmit_cnt && port->xmit_buf && !(port->IER & IER_TXRDY)) { port->IER |= IER_TXRDY; rc_out(bp, CD180_CAR, port_No(port)); rc_out(bp, CD180_IER, port->IER); } restore_flags(flags); } /* * This routine is called from the work queue when the interrupt * routine has signalled that a hangup has occurred. The path of * hangup processing is: * * serial interrupt routine -> (workqueue) -> * do_rc_hangup() -> tty->hangup() -> rc_hangup() * */ static void do_rc_hangup(struct work_struct *ugly_api) { struct riscom_port *port = container_of(ugly_api, struct riscom_port, tqueue_hangup); struct tty_struct *tty; tty = port->tty; if (tty) tty_hangup(tty); } static void rc_hangup(struct tty_struct * tty) { struct riscom_port *port = (struct riscom_port *)tty->driver_data; struct riscom_board *bp; if (rc_paranoia_check(port, tty->name, "rc_hangup")) return; bp = port_Board(port); rc_shutdown_port(bp, port); port->event = 0; port->count = 0; port->flags &= ~ASYNC_NORMAL_ACTIVE; port->tty = NULL; wake_up_interruptible(&port->open_wait); } static void rc_set_termios(struct tty_struct * tty, struct ktermios * old_termios) { struct riscom_port *port = (struct riscom_port *)tty->driver_data; unsigned long flags; if (rc_paranoia_check(port, tty->name, "rc_set_termios")) return; if (tty->termios->c_cflag == old_termios->c_cflag && tty->termios->c_iflag == old_termios->c_iflag) return; save_flags(flags); cli(); rc_change_speed(port_Board(port), port); restore_flags(flags); if ((old_termios->c_cflag & CRTSCTS) && !(tty->termios->c_cflag & CRTSCTS)) { tty->hw_stopped = 0; rc_start(tty); } } static void do_softint(struct work_struct *ugly_api) { struct riscom_port *port = container_of(ugly_api, struct riscom_port, tqueue); struct tty_struct *tty; if(!(tty = port->tty)) return; if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &port->event)) tty_wakeup(tty); } static const struct tty_operations riscom_ops = { .open = rc_open, .close = rc_close, .write = rc_write, .put_char = rc_put_char, .flush_chars = rc_flush_chars, .write_room = rc_write_room, .chars_in_buffer = rc_chars_in_buffer, .flush_buffer = rc_flush_buffer, .ioctl = rc_ioctl, .throttle = rc_throttle, .unthrottle = rc_unthrottle, .set_termios = rc_set_termios, .stop = rc_stop, .start = rc_start, .hangup = rc_hangup, .tiocmget = rc_tiocmget, .tiocmset = rc_tiocmset, }; static inline int rc_init_drivers(void) { int error; int i; riscom_driver = alloc_tty_driver(RC_NBOARD * RC_NPORT); if (!riscom_driver) return -ENOMEM; memset(IRQ_to_board, 0, sizeof(IRQ_to_board)); riscom_driver->owner = THIS_MODULE; riscom_driver->name = "ttyL"; riscom_driver->major = RISCOM8_NORMAL_MAJOR; riscom_driver->type = TTY_DRIVER_TYPE_SERIAL; riscom_driver->subtype = SERIAL_TYPE_NORMAL; riscom_driver->init_termios = tty_std_termios; riscom_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; riscom_driver->init_termios.c_ispeed = 9600; riscom_driver->init_termios.c_ospeed = 9600; riscom_driver->flags = TTY_DRIVER_REAL_RAW; tty_set_operations(riscom_driver, &riscom_ops); if ((error = tty_register_driver(riscom_driver))) { put_tty_driver(riscom_driver); printk(KERN_ERR "rc: Couldn't register RISCom/8 driver, " "error = %d\n", error); return 1; } memset(rc_port, 0, sizeof(rc_port)); for (i = 0; i < RC_NPORT * RC_NBOARD; i++) { rc_port[i].magic = RISCOM8_MAGIC; INIT_WORK(&rc_port[i].tqueue, do_softint); INIT_WORK(&rc_port[i].tqueue_hangup, do_rc_hangup); rc_port[i].close_delay = 50 * HZ/100; rc_port[i].closing_wait = 3000 * HZ/100; init_waitqueue_head(&rc_port[i].open_wait); init_waitqueue_head(&rc_port[i].close_wait); } return 0; } static void rc_release_drivers(void) { unsigned long flags; save_flags(flags); cli(); tty_unregister_driver(riscom_driver); put_tty_driver(riscom_driver); restore_flags(flags); } #ifndef MODULE /* * Called at boot time. * * You can specify IO base for up to RC_NBOARD cards, * using line "riscom8=0xiobase1,0xiobase2,.." at LILO prompt. * Note that there will be no probing at default * addresses in this case. * */ static int __init riscom8_setup(char *str) { int ints[RC_NBOARD]; int i; str = get_options(str, ARRAY_SIZE(ints), ints); for (i = 0; i < RC_NBOARD; i++) { if (i < ints[0]) rc_board[i].base = ints[i+1]; else rc_board[i].base = 0; } return 1; } __setup("riscom8=", riscom8_setup); #endif static char banner[] __initdata = KERN_INFO "rc: SDL RISCom/8 card driver v1.1, (c) D.Gorodchanin " "1994-1996.\n"; static char no_boards_msg[] __initdata = KERN_INFO "rc: No RISCom/8 boards detected.\n"; /* * This routine must be called by kernel at boot time */ static int __init riscom8_init(void) { int i; int found = 0; printk(banner); if (rc_init_drivers()) return -EIO; for (i = 0; i < RC_NBOARD; i++) if (rc_board[i].base && !rc_probe(&rc_board[i])) found++; if (!found) { rc_release_drivers(); printk(no_boards_msg); return -EIO; } return 0; } #ifdef MODULE static int iobase; static int iobase1; static int iobase2; static int iobase3; module_param(iobase, int, 0); module_param(iobase1, int, 0); module_param(iobase2, int, 0); module_param(iobase3, int, 0); MODULE_LICENSE("GPL"); #endif /* MODULE */ /* * You can setup up to 4 boards (current value of RC_NBOARD) * by specifying "iobase=0xXXX iobase1=0xXXX ..." as insmod parameter. * */ static int __init riscom8_init_module (void) { #ifdef MODULE int i; if (iobase || iobase1 || iobase2 || iobase3) { for(i = 0; i < RC_NBOARD; i++) rc_board[0].base = 0; } if (iobase) rc_board[0].base = iobase; if (iobase1) rc_board[1].base = iobase1; if (iobase2) rc_board[2].base = iobase2; if (iobase3) rc_board[3].base = iobase3; #endif /* MODULE */ return riscom8_init(); } static void __exit riscom8_exit_module (void) { int i; rc_release_drivers(); for (i = 0; i < RC_NBOARD; i++) if (rc_board[i].flags & RC_BOARD_PRESENT) rc_release_io_range(&rc_board[i]); } module_init(riscom8_init_module); module_exit(riscom8_exit_module);