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[/] [or1k_old/] [trunk/] [uclinux/] [uClinux-2.0.x/] [drivers/] [char/] [68332serial.c] - Rev 1765
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/* 68332serial.c: Serial port driver for 68332 microcontroller * * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>, * D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>, * The Silver Hammer Group, Ltd. * * Based on 68328serial.c. */ #include <linux/errno.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/config.h> #include <linux/major.h> #include <linux/string.h> #include <linux/fcntl.h> #include <linux/mm.h> #include <linux/kernel.h> #include <asm/io.h> #include <asm/irq.h> #include <asm/system.h> #include <asm/segment.h> #include <asm/bitops.h> #include <asm/delay.h> #if 0 #include <asm/kdebug.h> #endif #include "68332serial.h" /* Turn off usage of real serial interrupt code, to "support" Copilot */ #undef USE_INTS static struct m68k_serial m68k_soft; struct tty_struct m68k_ttys; /** struct tty_struct *m68k_constty; **/ /* Console hooks... */ /*static int m68k_cons_chanout = 0; static int m68k_cons_chanin = 0;*/ struct m68k_serial *m68k_consinfo = 0; #if 0 static unsigned char kgdb_regs[16] = { 0, 0, 0, /* write 0, 1, 2 */ (Rx8 | RxENABLE), /* write 3 */ (X16CLK | SB1 | PAR_EVEN), /* write 4 */ (Tx8 | TxENAB), /* write 5 */ 0, 0, 0, /* write 6, 7, 8 */ (NV), /* write 9 */ (NRZ), /* write 10 */ (TCBR | RCBR), /* write 11 */ 0, 0, /* BRG time constant, write 12 + 13 */ (BRSRC | BRENABL), /* write 14 */ (DCDIE) /* write 15 */ }; #endif #define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */ DECLARE_TASK_QUEUE(tq_serial); struct tty_driver serial_driver, callout_driver; static int serial_refcount; /* serial subtype definitions */ #define SERIAL_TYPE_NORMAL 1 #define SERIAL_TYPE_CALLOUT 2 /* number of characters left in xmit buffer before we ask for more */ #define WAKEUP_CHARS 256 /* Debugging... DEBUG_INTR is bad to use when one of the zs * lines is your console ;( */ #undef SERIAL_DEBUG_INTR #undef SERIAL_DEBUG_OPEN #undef SERIAL_DEBUG_FLOW #define RS_ISR_PASS_LIMIT 256 #define _INLINE_ inline static void change_speed(struct m68k_serial *info); static struct tty_struct *serial_table[2]; static struct termios *serial_termios[2]; static struct termios *serial_termios_locked[2]; #ifndef MIN #define MIN(a,b) ((a) < (b) ? (a) : (b)) #endif #if 0 /* * tmp_buf is used as a temporary buffer by serial_write. We need to * lock it in case the memcpy_fromfs blocks while swapping in a page, * and some other program tries to do a serial write at the same time. * Since the lock will only come under contention when the system is * swapping and available memory is low, it makes sense to share one * buffer across all the serial ports, since it significantly saves * memory if large numbers of serial ports are open. */ static unsigned char tmp_buf[4096]; /* This is cheating */ static struct semaphore tmp_buf_sem = MUTEX; #endif static inline int serial_paranoia_check(struct m68k_serial *info, dev_t device, const char *routine) { #ifdef SERIAL_PARANOIA_CHECK static const char *badmagic = "Warning: bad magic number for serial struct (%d, %d) in %s\n"; static const char *badinfo = "Warning: null m68k_serial for (%d, %d) in %s\n"; if (!info) { printk(badinfo, MAJOR(device), MINOR(device), routine); return 1; } if (info->magic != SERIAL_MAGIC) { printk(badmagic, MAJOR(device), MINOR(device), routine); return 1; } #endif return 0; } /* * This is used to figure out the divisor speeds and the timeouts */ static int baud_table[] = { 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 0 }; /* Sets or clears DTR/RTS on the requested line */ static inline void m68k_rtsdtr(struct m68k_serial *ss, int set) { if(set) { /* set the RTS/CTS line */ } else { /* clear it */ } return; } static inline void kgdb_chaninit(struct m68k_serial *ss, int intson, int bps) { #if 0 int brg; if(intson) { kgdb_regs[R1] = INT_ALL_Rx; kgdb_regs[R9] |= MIE; } else { kgdb_regs[R1] = 0; kgdb_regs[R9] &= ~MIE; } brg = BPS_TO_BRG(bps, ZS_CLOCK/16); kgdb_regs[R12] = (brg & 255); kgdb_regs[R13] = ((brg >> 8) & 255); load_zsregs(ss->m68k_channel, kgdb_regs); #endif } /* * ------------------------------------------------------------ * rs_stop() and rs_start() * * This routines are called before setting or resetting tty->stopped. * They enable or disable transmitter interrupts, as necessary. * ------------------------------------------------------------ */ static void rs_stop(struct tty_struct *tty) { struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_stop")) return; save_flags(flags); cli(); SCCR1 &= ~SCCR1_TIE; restore_flags(flags); } #if 0 static void rs_put_char(char ch) { int flags, loops = 0; save_flags(flags); cli(); /*while (!(UTX & UTX_FIFOEMPTY) && (loops < 10000)) {*/ while (!(SCSR & SCSR_TDRE) && (loops < 1000000)) { loops++; } SCDR = ch; restore_flags(flags); } #else static void rs_put_char(char ch) { int loops = 0; while (!(SCSR & SCSR_TDRE) && (loops < 1000000)) { loops++; } SCDR = ch; } #endif static void rs_start(struct tty_struct *tty) { struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_start")) return; save_flags(flags); cli(); if (info->xmit_cnt && info->xmit_buf && !(SCCR1 & SCCR1_TIE)) { SCCR1 |= SCCR1_TIE; } restore_flags(flags); } /* Drop into either the boot monitor or kadb upon receiving a break * from keyboard/console input. */ static void batten_down_hatches(void) { /* If we are doing kadb, we call the debugger * else we just drop into the boot monitor. * Note that we must flush the user windows * first before giving up control. */ #if 0 if((((unsigned long)linux_dbvec)>=DEBUG_FIRSTVADDR) && (((unsigned long)linux_dbvec)<=DEBUG_LASTVADDR)) sp_enter_debugger(); else panic("m68k_serial: batten_down_hatches"); return; #endif } /* * ---------------------------------------------------------------------- * * Here starts the interrupt handling routines. All of the following * subroutines are declared as inline and are folded into * rs_interrupt(). They were separated out for readability's sake. * * Note: rs_interrupt() is a "fast" interrupt, which means that it * runs with interrupts turned off. People who may want to modify * rs_interrupt() should try to keep the interrupt handler as fast as * possible. After you are done making modifications, it is not a bad * idea to do: * * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c * * and look at the resulting assemble code in serial.s. * * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 * ----------------------------------------------------------------------- */ /* * This routine is used by the interrupt handler to schedule * processing in the software interrupt portion of the driver. */ static _INLINE_ void rs_sched_event(struct m68k_serial *info, int event) { info->event |= 1 << event; queue_task_irq_off(&info->tqueue, &tq_serial); mark_bh(SERIAL_BH); } extern void breakpoint(void); /* For the KGDB frame character */ static _INLINE_ void receive_chars(struct m68k_serial *info, struct pt_regs *regs, unsigned short scsr, unsigned short scsd) { struct tty_struct *tty = info->tty; unsigned char ch = scsd & 0xff; if ((tty->termios->c_line == N_TTY) && (tty->termios->c_lflag & ICANON)) { if (ch == 16) { show_state(); show_free_areas(); show_buffers(); show_net_buffers(); goto clear_and_exit; } else if (ch == 20) { try_to_free_page(GFP_BUFFER,0,1); goto clear_and_exit; } else if (ch == 18) { hard_reset_now(); /* ! */ goto clear_and_exit; /* shrug */ } } if(info->is_cons) { #if 0 if(URX_BREAK & rx) { /* whee, break received */ batten_down_hatches(); /*rs_recv_clear(info->m68k_channel);*/ return; } else #endif if (ch == 1) { show_state(); return; } else if (ch == 2) { show_buffers(); return; } /* It is a 'keyboard interrupt' ;-) */ wake_up(&keypress_wait); } /* Look for kgdb 'stop' character, consult the gdb documentation * for remote target debugging and arch/sparc/kernel/sparc-stub.c * to see how all this works. */ /*if((info->kgdb_channel) && (ch =='\003')) { breakpoint(); goto clear_and_exit; }*/ if(!tty) goto clear_and_exit; if (tty->flip.count >= TTY_FLIPBUF_SIZE) queue_task_irq_off(&tty->flip.tqueue, &tq_timer); tty->flip.count++; if(scsr & SCSR_PF) *tty->flip.flag_buf_ptr++ = TTY_PARITY; else if(scsr & SCSR_OR) *tty->flip.flag_buf_ptr++ = TTY_OVERRUN; else if(scsr & SCSR_FE) *tty->flip.flag_buf_ptr++ = TTY_FRAME; else *tty->flip.flag_buf_ptr++ = 0; /* XXX */ *tty->flip.char_buf_ptr++ = ch; queue_task_irq_off(&tty->flip.tqueue, &tq_timer); clear_and_exit: return; } static _INLINE_ void transmit_chars(struct m68k_serial *info) { if (info->x_char) { /* Send next char */ SCDR = info->x_char; info->x_char = 0; goto clear_and_return; } if((info->xmit_cnt <= 0) || info->tty->stopped) { /* That's peculiar... */ SCCR1 &= ~SCCR1_TIE; goto clear_and_return; } /* Send char */ SCDR = info->xmit_buf[info->xmit_tail++]; info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); info->xmit_cnt--; if (info->xmit_cnt < WAKEUP_CHARS) rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); if(info->xmit_cnt <= 0) { SCCR1 &= ~SCCR1_TIE; goto clear_and_return; } clear_and_return: /* Clear interrupt (should be auto)*/ return; } #if 0 static _INLINE_ void status_handle(struct m68k_serial *info, unsigned short status) { #if 0 if(status & DCD) { if((info->tty->termios->c_cflag & CRTSCTS) && ((info->curregs[3] & AUTO_ENAB)==0)) { info->curregs[3] |= AUTO_ENAB; info->pendregs[3] |= AUTO_ENAB; write_zsreg(info->m68k_channel, 3, info->curregs[3]); } } else { if((info->curregs[3] & AUTO_ENAB)) { info->curregs[3] &= ~AUTO_ENAB; info->pendregs[3] &= ~AUTO_ENAB; write_zsreg(info->m68k_channel, 3, info->curregs[3]); } } #endif return; } #endif /* * This is the serial driver's generic interrupt routine */ void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs) { struct m68k_serial * info = &m68k_soft; unsigned short scsr = SCSR; unsigned short scdr = SCDR; /* *(volatile char*)0xfffa13 &= 0x7f;*/ if (scsr & SCSR_RDRF) receive_chars(info, regs, scsr, scdr); if (scsr & SCSR_TDRE) transmit_chars(info); return; } /* * ------------------------------------------------------------------- * Here ends the serial interrupt routines. * ------------------------------------------------------------------- */ /* * This routine is used to handle the "bottom half" processing for the * serial driver, known also the "software interrupt" processing. * This processing is done at the kernel interrupt level, after the * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This * is where time-consuming activities which can not be done in the * interrupt driver proper are done; the interrupt driver schedules * them using rs_sched_event(), and they get done here. */ static void do_serial_bh(void) { run_task_queue(&tq_serial); } static void do_softint(void *private_) { struct m68k_serial *info = (struct m68k_serial *) private_; struct tty_struct *tty; tty = info->tty; if (!tty) return; if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup) (tty->ldisc.write_wakeup)(tty); wake_up_interruptible(&tty->write_wait); } } /* * This routine is called from the scheduler tqueue when the interrupt * routine has signalled that a hangup has occurred. The path of * hangup processing is: * * serial interrupt routine -> (scheduler tqueue) -> * do_serial_hangup() -> tty->hangup() -> rs_hangup() * */ static void do_serial_hangup(void *private_) { struct m68k_serial *info = (struct m68k_serial *) private_; struct tty_struct *tty; tty = info->tty; if (!tty) return; tty_hangup(tty); } /* * This subroutine is called when the RS_TIMER goes off. It is used * by the serial driver to handle ports that do not have an interrupt * (irq=0). This doesn't work at all for 16450's, as a sun has a Z8530. */ static void rs_timer(void) { panic("rs_timer called\n"); return; } static int startup(struct m68k_serial * info) { unsigned long flags; if (info->flags & S_INITIALIZED) return 0; if (!info->xmit_buf) { info->xmit_buf = (unsigned char *) get_free_page(GFP_KERNEL); if (!info->xmit_buf) return -ENOMEM; } save_flags(flags); cli(); #ifdef SERIAL_DEBUG_OPEN printk("starting up ttyS%d (irq %d)...\n", info->line, info->irq); #endif /* * Clear the FIFO buffers and disable them * (they will be reenabled in change_speed()) */ SCCR1 = SCCR1_ILT | SCCR1_RE | SCCR1_TE; info->xmit_fifo_size = 1; if (SCSR & SCSR_RDRF) /* If there is data in FIFO... */ (void)SCDR; /* ...read it in and discard it. */ /* * Finally, enable sequencing and interrupts */ SCCR1 |= SCCR1_RIE; if (info->tty) clear_bit(TTY_IO_ERROR, &info->tty->flags); info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; /* * Set up serial timers... * We'll just leave them alone then D.J.D */ #if 0 /* Works well and stops the machine. */ timer_table[RS_TIMER].expires = jiffies + 2; timer_active |= 1 << RS_TIMER; #endif /* * and set the speed of the serial port */ change_speed(info); /*console_print_68332("{");*/ info->flags |= S_INITIALIZED; restore_flags(flags); return 0; } /* * This routine will shutdown a serial port; interrupts are disabled, and * DTR is dropped if the hangup on close termio flag is on. */ static void shutdown(struct m68k_serial * info) { unsigned long flags; /*printk("dc");*/ if (!(info->flags & S_INITIALIZED)) return; #ifdef SERIAL_DEBUG_OPEN printk("Shutting down serial port %d (irq %d)....\n", info->line, info->irq); #endif save_flags(flags); cli(); /* Disable interrupts */ if (info->xmit_buf) { free_page((unsigned long) info->xmit_buf); info->xmit_buf = 0; } /*console_print_68332("}");*/ SCCR0 = 0; /* Added */ SCCR1 = SCCR1_TE; if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags); info->flags &= ~S_INITIALIZED; restore_flags(flags); } /* * This routine is called to set the UART divisor registers to match * the specified baud rate for a serial port. */ static void change_speed(struct m68k_serial *info) { unsigned short port; unsigned short sccr1, sccr0; unsigned cflag; int i; int width; unsigned long sysclock; if (!info->tty || !info->tty->termios) return; cflag = info->tty->termios->c_cflag; if (!(port = info->port)) return; sccr1 = SCCR1; i = cflag & CBAUD; info->baud = baud_table[i]; #if 1 sysclock = FREF * 4 *(((SYNCR & 0x3f00)>>8) +1)*(1<<((SYNCR & 0xc000)>>14)); sccr0 = sysclock / (32 * info->baud); #ifdef DEBUG printk("Setting SCCR0 to %x (was %x) (baud rate %d, sysclock %d)\n", sccr0, SCCR0, info->baud, sysclock); #endif width = 1; /* Start bit */ switch (cflag & CSIZE) { /* Number of data bits */ case CS5: width += 5; break; case CS6: width += 6; break; case CS7: width += 7; break; case CS8: width += 8; break; } width++; /* Stop bit */ if (cflag & CSTOPB) width++; /* Second stop bit */ if (cflag & PARENB) { sccr1 |= SCCR1_PE; sccr1 &= ~SCCR1_PT; width++; /* Parity bit */ } else if (cflag & PARODD) { sccr1 |= SCCR1_PE; sccr1 |= SCCR1_PT; width++; /* Parity bit */ } else sccr1 &= ~SCCR1_PE; if (width == 10) sccr1 &= ~SCCR1_M; /* 10-bit frame */ else if (width == 11) sccr1 |= SCCR1_M; /* 11-bit frame */ else { printk("68332: Warning, unsupported serial frame length %d\n", width); sccr1 |= SCCR1_M; } SCCR0 = sccr0; SCCR1 = sccr1; #endif return; } /* * Fair output driver allows a process to speak. */ static void rs_fair_output(void) { int left; /* Output no more than that */ unsigned long flags; struct m68k_serial *info = &m68k_soft; char c; if (info == 0) return; if (info->xmit_buf == 0) return; save_flags(flags); cli(); left = info->xmit_cnt; while (left != 0) { c = info->xmit_buf[info->xmit_tail]; info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1); info->xmit_cnt--; restore_flags(flags); rs_put_char(c); save_flags(flags); cli(); left = MIN(info->xmit_cnt, left-1); } /* Last character is being transmitted now (hopefully). */ udelay(5); restore_flags(flags); return; } #if 0 /* * m68k_console_print is registered for printk. */ void console_print_68332(const char *p) { char c; if (!(SCCR1 & SCCR1_TE)) { SCCR1 |= SCCR1_TE; while((c=*(p++)) != 0) { if(c == '\n') rs_put_char('\r'); rs_put_char(c); } SCCR1 &= ~SCCR1_TE; return; } while((c=*(p++)) != 0) { if(c == '\n') rs_put_char('\r'); rs_put_char(c); } /* Comment this if you want to have a strict interrupt-driven output */ /*rs_fair_output();*/ return; } #else /* * console_print_68332 can be registered for printk. */ void console_print_68332(const char *p) { char c; unsigned long flags; static struct m68k_serial * info = &m68k_soft; unsigned short sccr0,sccr1; if (!SCCR0) return; save_flags(flags); cli(); sccr1 = SCCR1; /* Enable transmitter, and disable transmit interrupts */ SCCR1 = (sccr1 & ~SCCR1_TIE) | SCCR1_TE; restore_flags(flags); while((c=*(p++)) != 0) { if(c == '\n') rs_put_char('\r'); rs_put_char(c); } if (info->xmit_buf && info->xmit_cnt && (sccr1 & SCCR1_TIE) && (sccr1 & SCCR1_TE)) { /* Re-prime transmitter. */ cli(); SCCR1 |= SCCR1_TIE; if (SCSR & SCSR_TDRE) { SCDR = info->xmit_buf[info->xmit_tail++]; info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); info->xmit_cnt--; } if (!info->xmit_cnt) SCCR1 &= ~SCCR1_TIE; restore_flags(flags); } return; } #endif static void rs_flush_chars(struct tty_struct *tty) { struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_flush_chars")) return; if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || !info->xmit_buf) return; /* Enable transmitter */ save_flags(flags); cli(); do { cli(); SCCR1 |= SCCR1_TIE; if (SCSR & SCSR_TDRE) { SCDR = info->xmit_buf[info->xmit_tail++]; info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); info->xmit_cnt--; } sti(); if (!info->xmit_cnt) SCCR1 &= ~SCCR1_TIE; } while ((info->xmit_cnt > 0) && (!tty->stopped) && (!tty->hw_stopped)); restore_flags(flags); } extern void console_printn(const char * b, int count); static int rs_write(struct tty_struct * tty, int from_user, const unsigned char *buf, int count) { int c, total = 0; struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_write")) return 0; if (!tty || !info->xmit_buf) return 0; /*for(c=0;c<count;c++) printk("{%c}", buf[c]);*/ save_flags(flags); while (1) { cli(); c = MIN(count, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, SERIAL_XMIT_SIZE - info->xmit_head)); if (c <= 0) break; #if 0 if (from_user) { down(&tmp_buf_sem); memcpy_fromfs(tmp_buf, buf, c); c = MIN(c, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, SERIAL_XMIT_SIZE - info->xmit_head)); memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c); up(&tmp_buf_sem); } else #endif memcpy(info->xmit_buf + info->xmit_head, buf, c); info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); info->xmit_cnt += c; restore_flags(flags); buf += c; count -= c; total += c; } #if 1 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped && !(SCCR1 & SCCR1_TIE)) { /* Enable transmitter */ cli(); SCCR1 |= SCCR1_TIE; if (SCSR & SCSR_TDRE) { SCDR = info->xmit_buf[info->xmit_tail++]; info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); info->xmit_cnt--; } if (!info->xmit_cnt) SCCR1 &= ~SCCR1_TIE; } #else while ((info->xmit_cnt > 0) && !tty->stopped && !tty->hw_stopped) { rs_put_char(info->xmit_buf[info->xmit_tail++]); info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); info->xmit_cnt--; } #endif restore_flags(flags); /* printk("rs_write = %d\n", total);*/ return total; } static int rs_write_room(struct tty_struct *tty) { struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; int ret; if (serial_paranoia_check(info, tty->device, "rs_write_room")) return 0; ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; if (ret < 0) ret = 0; return ret; } static int rs_chars_in_buffer(struct tty_struct *tty) { struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer")) return 0; return info->xmit_cnt; } static void rs_flush_buffer(struct tty_struct *tty) { struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; if (serial_paranoia_check(info, tty->device, "rs_flush_buffer")) return; cli(); info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; sti(); wake_up_interruptible(&tty->write_wait); if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup) (tty->ldisc.write_wakeup)(tty); } /* * ------------------------------------------------------------ * rs_throttle() * * This routine is called by the upper-layer tty layer to signal that * incoming characters should be throttled. * ------------------------------------------------------------ */ static void rs_throttle(struct tty_struct * tty) { struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; #ifdef SERIAL_DEBUG_THROTTLE char buf[64]; printk("throttle %s: %d....\n", _tty_name(tty, buf), tty->ldisc.chars_in_buffer(tty)); #endif if (serial_paranoia_check(info, tty->device, "rs_throttle")) return; if (I_IXOFF(tty)) info->x_char = STOP_CHAR(tty); /* Turn off RTS line (do this atomic) */ } static void rs_unthrottle(struct tty_struct * tty) { struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; #ifdef SERIAL_DEBUG_THROTTLE char buf[64]; printk("unthrottle %s: %d....\n", _tty_name(tty, buf), tty->ldisc.chars_in_buffer(tty)); #endif if (serial_paranoia_check(info, tty->device, "rs_unthrottle")) return; if (I_IXOFF(tty)) { if (info->x_char) info->x_char = 0; else info->x_char = START_CHAR(tty); } /* Assert RTS line (do this atomic) */ } /* * ------------------------------------------------------------ * rs_ioctl() and friends * ------------------------------------------------------------ */ static int get_serial_info(struct m68k_serial * info, struct serial_struct * retinfo) { struct serial_struct tmp; if (!retinfo) return -EFAULT; memset(&tmp, 0, sizeof(tmp)); tmp.type = info->type; tmp.line = info->line; tmp.port = info->port; tmp.irq = info->irq; tmp.flags = info->flags; tmp.baud_base = info->baud_base; tmp.close_delay = info->close_delay; tmp.closing_wait = info->closing_wait; tmp.custom_divisor = info->custom_divisor; memcpy_tofs(retinfo,&tmp,sizeof(*retinfo)); return 0; } static int set_serial_info(struct m68k_serial * info, struct serial_struct * new_info) { struct serial_struct new_serial; struct m68k_serial old_info; int retval = 0; if (!new_info) return -EFAULT; memcpy_fromfs(&new_serial,new_info,sizeof(new_serial)); old_info = *info; if (!suser()) { if ((new_serial.baud_base != info->baud_base) || (new_serial.type != info->type) || (new_serial.close_delay != info->close_delay) || ((new_serial.flags & ~S_USR_MASK) != (info->flags & ~S_USR_MASK))) return -EPERM; info->flags = ((info->flags & ~S_USR_MASK) | (new_serial.flags & S_USR_MASK)); info->custom_divisor = new_serial.custom_divisor; goto check_and_exit; } if (info->count > 1) return -EBUSY; /* * OK, past this point, all the error checking has been done. * At this point, we start making changes..... */ info->baud_base = new_serial.baud_base; info->flags = ((info->flags & ~S_FLAGS) | (new_serial.flags & S_FLAGS)); info->type = new_serial.type; info->close_delay = new_serial.close_delay; info->closing_wait = new_serial.closing_wait; check_and_exit: retval = startup(info); return retval; } /* * get_lsr_info - get line status register info * * Purpose: Let user call ioctl() to get info when the UART physically * is emptied. On bus types like RS485, the transmitter must * release the bus after transmitting. This must be done when * the transmit shift register is empty, not be done when the * transmit holding register is empty. This functionality * allows an RS485 driver to be written in user space. */ static int get_lsr_info(struct m68k_serial * info, unsigned int *value) { unsigned char status; cli(); status = 0; sti(); put_user(status,value); return 0; } /* * This routine sends a break character out the serial port. */ static void send_break( struct m68k_serial * info, int duration) { if (!info->port) return; current->state = TASK_INTERRUPTIBLE; current->timeout = jiffies + duration; cli(); SCCR1 |= SCCR1_SBK; schedule(); SCCR1 &= SCCR1_SBK; sti(); } static int rs_ioctl(struct tty_struct *tty, struct file * file, unsigned int cmd, unsigned long arg) { int error; struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; int retval; if (serial_paranoia_check(info, tty->device, "rs_ioctl")) return -ENODEV; if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { if (tty->flags & (1 << TTY_IO_ERROR)) return -EIO; } 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) send_break(info, HZ/4); /* 1/4 second */ return 0; case TCSBRKP: /* support for POSIX tcsendbreak() */ retval = tty_check_change(tty); if (retval) return retval; tty_wait_until_sent(tty, 0); send_break(info, arg ? arg*(HZ/10) : HZ/4); return 0; case TIOCGSOFTCAR: error = verify_area(VERIFY_WRITE, (void *) arg,sizeof(long)); if (error) return error; put_fs_long(C_CLOCAL(tty) ? 1 : 0, (unsigned long *) arg); return 0; case TIOCSSOFTCAR: arg = get_fs_long((unsigned long *) arg); tty->termios->c_cflag = ((tty->termios->c_cflag & ~CLOCAL) | (arg ? CLOCAL : 0)); return 0; case TIOCGSERIAL: error = verify_area(VERIFY_WRITE, (void *) arg, sizeof(struct serial_struct)); if (error) return error; return get_serial_info(info, (struct serial_struct *) arg); case TIOCSSERIAL: return set_serial_info(info, (struct serial_struct *) arg); case TIOCSERGETLSR: /* Get line status register */ error = verify_area(VERIFY_WRITE, (void *) arg, sizeof(unsigned int)); if (error) return error; else return get_lsr_info(info, (unsigned int *) arg); case TIOCSERGSTRUCT: error = verify_area(VERIFY_WRITE, (void *) arg, sizeof(struct m68k_serial)); if (error) return error; memcpy_tofs((struct m68k_serial *) arg, info, sizeof(struct m68k_serial)); return 0; default: return -ENOIOCTLCMD; } return 0; } static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios) { struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; if (tty->termios->c_cflag == old_termios->c_cflag) return; change_speed(info); if ((old_termios->c_cflag & CRTSCTS) && !(tty->termios->c_cflag & CRTSCTS)) { tty->hw_stopped = 0; rs_start(tty); } } /* * ------------------------------------------------------------ * rs_close() * * This routine is called when the serial port gets closed. First, we * wait for the last remaining data to be sent. Then, we unlink its * S structure from the interrupt chain if necessary, and we free * that IRQ if nothing is left in the chain. * ------------------------------------------------------------ */ static void rs_close(struct tty_struct *tty, struct file * filp) { struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; unsigned long flags; if (!info || serial_paranoia_check(info, tty->device, "rs_close")) return; save_flags(flags); cli(); if (tty_hung_up_p(filp)) { restore_flags(flags); return; } #ifdef SERIAL_DEBUG_OPEN printk("rs_close ttyS%d, count = %d\n", info->line, info->count); #endif if ((tty->count == 1) && (info->count != 1)) { /* * Uh, oh. tty->count is 1, which means that the tty * structure will be freed. Info->count should always * be one in these conditions. If it's greater than * one, we've got real problems, since it means the * serial port won't be shutdown. */ printk("rs_close: bad serial port count; tty->count is 1, " "info->count is %d\n", info->count); info->count = 1; } if (--info->count < 0) { printk("rs_close: bad serial port count for ttyS%d: %d\n", info->line, info->count); info->count = 0; } if (info->count) { restore_flags(flags); return; } info->flags |= S_CLOSING; /* * Save the termios structure, since this port may have * separate termios for callout and dialin. */ if (info->flags & S_NORMAL_ACTIVE) info->normal_termios = *tty->termios; if (info->flags & S_CALLOUT_ACTIVE) info->callout_termios = *tty->termios; /* * 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 (info->closing_wait != S_CLOSING_WAIT_NONE) tty_wait_until_sent(tty, info->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. */ SCCR1 &= ~(SCCR1_RIE | SCCR1_RE | SCCR1_RWU); shutdown(info); if (tty->driver.flush_buffer) tty->driver.flush_buffer(tty); if (tty->ldisc.flush_buffer) tty->ldisc.flush_buffer(tty); tty->closing = 0; info->event = 0; info->tty = 0; if (tty->ldisc.num != ldiscs[N_TTY].num) { if (tty->ldisc.close) (tty->ldisc.close)(tty); tty->ldisc = ldiscs[N_TTY]; tty->termios->c_line = N_TTY; if (tty->ldisc.open) (tty->ldisc.open)(tty); } if (info->blocked_open) { if (info->close_delay) { current->state = TASK_INTERRUPTIBLE; current->timeout = jiffies + info->close_delay; schedule(); } wake_up_interruptible(&info->open_wait); } info->flags &= ~(S_NORMAL_ACTIVE|S_CALLOUT_ACTIVE| S_CLOSING); wake_up_interruptible(&info->close_wait); restore_flags(flags); } /* * rs_hangup() --- called by tty_hangup() when a hangup is signaled. */ void rs_hangup(struct tty_struct *tty) { struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; if (serial_paranoia_check(info, tty->device, "rs_hangup")) return; rs_flush_buffer(tty); shutdown(info); info->event = 0; info->count = 0; info->flags &= ~(S_NORMAL_ACTIVE|S_CALLOUT_ACTIVE); info->tty = 0; wake_up_interruptible(&info->open_wait); } /* * ------------------------------------------------------------ * rs_open() and friends * ------------------------------------------------------------ */ static int block_til_ready(struct tty_struct *tty, struct file * filp, struct m68k_serial *info) { struct wait_queue wait = { current, NULL }; int retval; int do_clocal = 0; /* * If the device is in the middle of being closed, then block * until it's done, and then try again. */ if (info->flags & S_CLOSING) { interruptible_sleep_on(&info->close_wait); #ifdef SERIAL_DO_RESTART if (info->flags & S_HUP_NOTIFY) return -EAGAIN; else return -ERESTARTSYS; #else return -EAGAIN; #endif } /* * If this is a callout device, then just make sure the normal * device isn't being used. */ if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) { if (info->flags & S_NORMAL_ACTIVE) return -EBUSY; if ((info->flags & S_CALLOUT_ACTIVE) && (info->flags & S_SESSION_LOCKOUT) && (info->session != current->session)) return -EBUSY; if ((info->flags & S_CALLOUT_ACTIVE) && (info->flags & S_PGRP_LOCKOUT) && (info->pgrp != current->pgrp)) return -EBUSY; info->flags |= S_CALLOUT_ACTIVE; return 0; } /* * 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))) { if (info->flags & S_CALLOUT_ACTIVE) return -EBUSY; info->flags |= S_NORMAL_ACTIVE; return 0; } if (info->flags & S_CALLOUT_ACTIVE) { if (info->normal_termios.c_cflag & CLOCAL) do_clocal = 1; } else { if (tty->termios->c_cflag & CLOCAL) 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(&info->open_wait, &wait); #ifdef SERIAL_DEBUG_OPEN printk("block_til_ready before block: ttyS%d, count = %d\n", info->line, info->count); #endif info->count--; info->blocked_open++; while (1) { cli(); if (!(info->flags & S_CALLOUT_ACTIVE)) m68k_rtsdtr(info, 1); sti(); current->state = TASK_INTERRUPTIBLE; if (tty_hung_up_p(filp) || !(info->flags & S_INITIALIZED)) { #ifdef SERIAL_DO_RESTART if (info->flags & S_HUP_NOTIFY) retval = -EAGAIN; else retval = -ERESTARTSYS; #else retval = -EAGAIN; #endif break; } if (!(info->flags & S_CALLOUT_ACTIVE) && !(info->flags & S_CLOSING) && do_clocal) break; if (current->signal & ~current->blocked) { retval = -ERESTARTSYS; break; } #ifdef SERIAL_DEBUG_OPEN printk("block_til_ready blocking: ttyS%d, count = %d\n", info->line, info->count); #endif schedule(); } current->state = TASK_RUNNING; remove_wait_queue(&info->open_wait, &wait); if (!tty_hung_up_p(filp)) info->count++; info->blocked_open--; #ifdef SERIAL_DEBUG_OPEN printk("block_til_ready after blocking: ttyS%d, count = %d\n", info->line, info->count); #endif if (retval) return retval; info->flags |= S_NORMAL_ACTIVE; return 0; } /* * This routine is called whenever a serial port is opened. It * enables interrupts for a serial port, linking in its S structure into * the IRQ chain. It also performs the serial-specific * initialization for the tty structure. */ int rs_open(struct tty_struct *tty, struct file * filp) { struct m68k_serial *info; int retval, line; line = MINOR(tty->device) - tty->driver.minor_start; if (line != 0) /* we have exactly one */ return -ENODEV; info = &m68k_soft; #if 0 /* Is the kgdb running over this line? */ if (info->kgdb_channel) return -ENODEV; #endif if (serial_paranoia_check(info, tty->device, "rs_open")) return -ENODEV; #ifdef SERIAL_DEBUG_OPEN printk("rs_open %s%d, count = %d\n", tty->driver.name, info->line, info->count); #endif info->count++; tty->driver_data = info; info->tty = tty; /* * Start up serial port */ retval = startup(info); if (retval) return retval; retval = block_til_ready(tty, filp, info); if (retval) { #ifdef SERIAL_DEBUG_OPEN printk("rs_open returning after block_til_ready with %d\n", retval); #endif return retval; } if ((info->count == 1) && (info->flags & S_SPLIT_TERMIOS)) { if (tty->driver.subtype == SERIAL_TYPE_NORMAL) *tty->termios = info->normal_termios; else *tty->termios = info->callout_termios; change_speed(info); } info->session = current->session; info->pgrp = current->pgrp; #ifdef SERIAL_DEBUG_OPEN printk("rs_open ttyS%d successful...\n", info->line); #endif return 0; } /* Finally, routines used to initialize the serial driver. */ static void show_serial_version(void) { printk("MC68332 serial driver version 1.00\n"); } extern void register_console(void (*proc)(const char *)); volatile int test_done; /* rs_init inits the driver */ int rs68332_init(void) { int flags; struct m68k_serial *info; /* Setup base handler, and timer table. */ init_bh(SERIAL_BH, do_serial_bh); timer_table[RS_TIMER].fn = rs_timer; timer_table[RS_TIMER].expires = 0; show_serial_version(); /* Initialize the tty_driver structure */ /* SPARC: Not all of this is exactly right for us. */ memset(&serial_driver, 0, sizeof(struct tty_driver)); serial_driver.magic = TTY_DRIVER_MAGIC; serial_driver.name = "ttyS"; serial_driver.major = TTY_MAJOR; serial_driver.minor_start = 64; serial_driver.num = 1; serial_driver.type = TTY_DRIVER_TYPE_SERIAL; serial_driver.subtype = SERIAL_TYPE_NORMAL; serial_driver.init_termios = tty_std_termios; serial_driver.init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; serial_driver.flags = TTY_DRIVER_REAL_RAW; serial_driver.refcount = &serial_refcount; serial_driver.table = serial_table; serial_driver.termios = serial_termios; serial_driver.termios_locked = serial_termios_locked; serial_driver.open = rs_open; serial_driver.close = rs_close; serial_driver.write = rs_write; serial_driver.flush_chars = rs_flush_chars; serial_driver.write_room = rs_write_room; serial_driver.chars_in_buffer = rs_chars_in_buffer; serial_driver.flush_buffer = rs_flush_buffer; serial_driver.ioctl = rs_ioctl; serial_driver.throttle = rs_throttle; serial_driver.unthrottle = rs_unthrottle; serial_driver.set_termios = rs_set_termios; serial_driver.stop = rs_stop; serial_driver.start = rs_start; serial_driver.hangup = rs_hangup; /* * The callout device is just like normal device except for * major number and the subtype code. */ callout_driver = serial_driver; callout_driver.name = "cua"; callout_driver.major = TTYAUX_MAJOR; callout_driver.subtype = SERIAL_TYPE_CALLOUT; if (tty_register_driver(&serial_driver)) panic("Couldn't register serial driver\n"); if (tty_register_driver(&callout_driver)) panic("Couldn't register callout driver\n"); save_flags(flags); cli(); info = &m68k_soft; info->magic = SERIAL_MAGIC; info->port = 1; info->tty = 0; info->irq = 0;/*zilog_irq;*/ info->custom_divisor = 16; info->close_delay = 50; info->closing_wait = 3000; info->x_char = 0; info->event = 0; info->count = 0; info->blocked_open = 0; info->tqueue.routine = do_softint; info->tqueue.data = info; info->tqueue_hangup.routine = do_serial_hangup; info->tqueue_hangup.data = info; info->callout_termios =callout_driver.init_termios; info->normal_termios = serial_driver.init_termios; info->open_wait = 0; info->close_wait = 0; info->line = 0; printk("%s%d", serial_driver.name, info->line); printk(" is a builtin MC68332 UART\n"); QSMCR = 0x408f; QILR = 0x0142; #if 0 if (request_irq(zilog_irq, rs_interrupt, (SA_INTERRUPT | SA_STATIC_ALLOC), "Zilog8530", NULL)) panic("Unable to attach zs intr\n"); #endif restore_flags(flags); return 0; } /* * register_serial and unregister_serial allows for serial ports to be * configured at run-time, to support PCMCIA modems. */ /* SPARC: Unused at this time, just here to make things link. */ int register_serial(struct serial_struct *req) { return -1; } void unregister_serial(int line) { return; } #if 0 /* Hooks for running a serial console. con_init() calls this if the * console is being run over one of the ttya/ttyb serial ports. * 'chip' should be zero, as chip 1 drives the mouse/keyboard. * 'channel' is decoded as 0=TTYA 1=TTYB, note that the channels * are addressed backwards, channel B is first, then channel A. */ void rs_cons_hook(int chip, int out, int channel) { if(chip) panic("rs_cons_hook called with chip not zero"); if(!m68k_chips[chip]) { m68k_chips[chip] = get_zs(chip); /* Two channels per chip */ m68k_channels[(chip*2)] = &m68k_chips[chip]->channelA; m68k_channels[(chip*2)+1] = &m68k_chips[chip]->channelB; } m68k_soft[channel].m68k_channel = m68k_channels[channel]; m68k_soft[channel].change_needed = 0; m68k_soft[channel].clk_divisor = 16; m68k_soft[channel].m68k_baud = get_zsbaud(&m68k_soft[channel]); rs_cons_check(&m68k_soft[channel], channel); if(out) m68k_cons_chanout = ((chip * 2) + channel); else m68k_cons_chanin = ((chip * 2) + channel); } /* This is called at boot time to prime the kgdb serial debugging * serial line. The 'tty_num' argument is 0 for /dev/ttya and 1 * for /dev/ttyb which is determined in setup_arch() from the * boot command line flags. */ void rs_kgdb_hook(int tty_num) { int chip = 0; if(!m68k_chips[chip]) { m68k_chips[chip] = get_zs(chip); /* Two channels per chip */ m68k_channels[(chip*2)] = &m68k_chips[chip]->channelA; m68k_channels[(chip*2)+1] = &m68k_chips[chip]->channelB; } m68k_soft[tty_num].m68k_channel = m68k_channels[tty_num]; m68k_kgdbchan = m68k_soft[tty_num].m68k_channel; m68k_soft[tty_num].change_needed = 0; m68k_soft[tty_num].clk_divisor = 16; m68k_soft[tty_num].m68k_baud = get_zsbaud(&m68k_soft[tty_num]); m68k_soft[tty_num].kgdb_channel = 1; /* This runs kgdb */ m68k_soft[tty_num ^ 1].kgdb_channel = 0; /* This does not */ /* Turn on transmitter/receiver at 8-bits/char */ kgdb_chaninit(&m68k_soft[tty_num], 0, 9600); ZS_CLEARERR(m68k_kgdbchan); udelay(5); ZS_CLEARFIFO(m68k_kgdbchan); } #endif
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