Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2858 insertions, 0 deletions

diff --git a/drivers/char/serial167.c b/drivers/char/serial167.c
new file mode 100644
index 00000000000..c2deac968bd
--- /dev/null
+++ b/drivers/char/serial167.c
@@ -0,0 +1,2858 @@
+/*
+ * linux/drivers/char/serial167.c
+ *
+ * Driver for MVME166/7 board serial ports, which are via a CD2401.
+ * Based very much on cyclades.c.
+ *
+ * MVME166/7 work by Richard Hirst [richard@sleepie.demon.co.uk]
+ *
+ * ==============================================================
+ *
+ * static char rcsid[] =
+ * "$Revision: 1.36.1.4 $$Date: 1995/03/29 06:14:14 $";
+ *
+ *  linux/kernel/cyclades.c
+ *
+ * Maintained by Marcio Saito (cyclades@netcom.com) and
+ * Randolph Bentson (bentson@grieg.seaslug.org)
+ *
+ * Much of the design and some of the code came from serial.c
+ * which was copyright (C) 1991, 1992  Linus Torvalds.  It was
+ * extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92,
+ * and then fixed as suggested by Michael K. Johnson 12/12/92.
+ *
+ * This version does not support shared irq's.
+ *
+ * $Log: cyclades.c,v $
+ * Revision 1.36.1.4  1995/03/29  06:14:14  bentson
+ * disambiguate between Cyclom-16Y and Cyclom-32Ye;
+ *
+ * Changes:
+ *
+ * 200 lines of changes record removed - RGH 11-10-95, starting work on
+ * converting this to drive serial ports on mvme166 (cd2401).
+ *
+ * Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 2000/08/25
+ * - get rid of verify_area
+ * - use get_user to access memory from userspace in set_threshold,
+ *   set_default_threshold and set_timeout
+ * - don't use the panic function in serial167_init
+ * - do resource release on failure on serial167_init
+ * - include missing restore_flags in mvme167_serial_console_setup
+ *
+ * Kars de Jong <jongk@linux-m68k.org> - 2004/09/06
+ * - replace bottom half handler with task queue handler
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/tty.h>
+#include <linux/interrupt.h>
+#include <linux/serial.h>
+#include <linux/serialP.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/serial167.h>
+#include <linux/delay.h>
+#include <linux/major.h>
+#include <linux/mm.h>
+#include <linux/console.h>
+#include <linux/module.h>
+#include <linux/bitops.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/mvme16xhw.h>
+#include <asm/bootinfo.h>
+#include <asm/setup.h>
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+
+#include <asm/uaccess.h>
+#include <linux/init.h>
+
+#define SERIAL_PARANOIA_CHECK
+#undef  SERIAL_DEBUG_OPEN
+#undef  SERIAL_DEBUG_THROTTLE
+#undef  SERIAL_DEBUG_OTHER
+#undef  SERIAL_DEBUG_IO
+#undef  SERIAL_DEBUG_COUNT
+#undef  SERIAL_DEBUG_DTR
+#undef  CYCLOM_16Y_HACK
+#define  CYCLOM_ENABLE_MONITORING
+
+#define WAKEUP_CHARS 256
+
+#define STD_COM_FLAGS (0)
+
+#define SERIAL_TYPE_NORMAL  1
+
+static struct tty_driver *cy_serial_driver;
+extern int serial_console;
+static struct cyclades_port *serial_console_info = NULL;
+static unsigned int serial_console_cflag = 0;
+u_char initial_console_speed;
+
+/* Base address of cd2401 chip on mvme166/7 */
+
+#define BASE_ADDR (0xfff45000)
+#define pcc2chip	((volatile u_char *)0xfff42000)
+#define PccSCCMICR	0x1d
+#define PccSCCTICR	0x1e
+#define PccSCCRICR	0x1f
+#define PccTPIACKR	0x25
+#define PccRPIACKR	0x27
+#define PccIMLR		0x3f
+
+/* This is the per-port data structure */
+struct cyclades_port cy_port[] = {
+      /* CARD#  */
+        {-1 },      /* ttyS0 */
+        {-1 },      /* ttyS1 */
+        {-1 },      /* ttyS2 */
+        {-1 },      /* ttyS3 */
+};
+#define NR_PORTS        (sizeof(cy_port)/sizeof(struct cyclades_port))
+
+/*
+ * tmp_buf is used as a temporary buffer by serial_write.  We need to
+ * lock it in case the copy_from_user 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 = 0;
+DECLARE_MUTEX(tmp_buf_sem);
+
+/*
+ * This is used to look up the divisor speeds and the timeouts
+ * We're normally limited to 15 distinct baud rates.  The extra
+ * are accessed via settings in info->flags.
+ *         0,     1,     2,     3,     4,     5,     6,     7,     8,     9,
+ *        10,    11,    12,    13,    14,    15,    16,    17,    18,    19,
+ *                                                  HI            VHI
+ */
+static int baud_table[] = {
+           0,    50,    75,   110,   134,   150,   200,   300,   600,  1200,
+        1800,  2400,  4800,  9600, 19200, 38400, 57600, 76800,115200,150000,
+        0};
+
+#if 0
+static char baud_co[] = {  /* 25 MHz clock option table */
+        /* value =>    00    01   02    03    04 */
+        /* divide by    8    32   128   512  2048 */
+        0x00,  0x04,  0x04,  0x04,  0x04,  0x04,  0x03,  0x03,  0x03,  0x02,
+        0x02,  0x02,  0x01,  0x01,  0x00,  0x00,  0x00,  0x00,  0x00,  0x00};
+
+static char baud_bpr[] = {  /* 25 MHz baud rate period table */
+        0x00,  0xf5,  0xa3,  0x6f,  0x5c,  0x51,  0xf5,  0xa3,  0x51,  0xa3,
+        0x6d,  0x51,  0xa3,  0x51,  0xa3,  0x51,  0x36,  0x29,  0x1b,  0x15};
+#endif
+
+/* I think 166 brd clocks 2401 at 20MHz.... */
+
+/* These values are written directly to tcor, and >> 5 for writing to rcor */
+static u_char baud_co[] = {  /* 20 MHz clock option table */
+        0x00,  0x80,  0x80,  0x80,  0x80,  0x80,  0x80,  0x60,  0x60,  0x40,
+        0x40,  0x40,  0x20,  0x20,  0x00,  0x00,  0x00,  0x00,  0x00,  0x00};
+
+/* These values written directly to tbpr/rbpr */
+static u_char baud_bpr[] = {  /* 20 MHz baud rate period table */
+        0x00,  0xc0,  0x80,  0x58,  0x6c,  0x40,  0xc0,  0x81,  0x40,  0x81,
+        0x57,  0x40,  0x81,  0x40,  0x81,  0x40,  0x2b,  0x20,  0x15,  0x10};
+
+static u_char baud_cor4[] = {  /* receive threshold */
+        0x0a,  0x0a,  0x0a,  0x0a,  0x0a,  0x0a,  0x0a,  0x0a,  0x0a,  0x0a,
+        0x0a,  0x0a,  0x0a,  0x09,  0x09,  0x08,  0x08,  0x08,  0x08,  0x07};
+
+
+
+static void shutdown(struct cyclades_port *);
+static int startup (struct cyclades_port *);
+static void cy_throttle(struct tty_struct *);
+static void cy_unthrottle(struct tty_struct *);
+static void config_setup(struct cyclades_port *);
+extern void console_print(const char *);
+#ifdef CYCLOM_SHOW_STATUS
+static void show_status(int);
+#endif
+
+#ifdef CONFIG_REMOTE_DEBUG
+static void debug_setup(void);
+void queueDebugChar (int c);
+int getDebugChar(void);
+
+#define DEBUG_PORT	1
+#define DEBUG_LEN	256
+
+typedef struct {
+	int	in;
+	int	out;
+	unsigned char	buf[DEBUG_LEN];
+} debugq;
+
+debugq debugiq;
+#endif
+
+/*
+ * I have my own version of udelay(), as it is needed when initialising
+ * the chip, before the delay loop has been calibrated.  Should probably
+ * reference one of the vmechip2 or pccchip2 counter for an accurate
+ * delay, but this wild guess will do for now.
+ */
+
+void my_udelay (long us)
+{
+	u_char x;
+	volatile u_char *p = &x;
+	int i;
+
+	while (us--)
+		for (i = 100; i; i--)
+			x |= *p;
+}
+
+static inline int
+serial_paranoia_check(struct cyclades_port *info, char *name,
+		      const char *routine)
+{
+#ifdef SERIAL_PARANOIA_CHECK
+    static const char *badmagic =
+	"Warning: bad magic number for serial struct (%s) in %s\n";
+    static const char *badinfo =
+	"Warning: null cyclades_port for (%s) in %s\n";
+    static const char *badrange =
+	"Warning: cyclades_port out of range for (%s) in %s\n";
+
+    if (!info) {
+	printk(badinfo, name, routine);
+	return 1;
+    }
+
+    if( (long)info < (long)(&cy_port[0])
+    || (long)(&cy_port[NR_PORTS]) < (long)info ){
+	printk(badrange, name, routine);
+	return 1;
+    }
+
+    if (info->magic != CYCLADES_MAGIC) {
+	printk(badmagic, name, routine);
+	return 1;
+    }
+#endif
+	return 0;
+} /* serial_paranoia_check */
+
+#if 0
+/* The following diagnostic routines allow the driver to spew
+   information on the screen, even (especially!) during interrupts.
+ */
+void
+SP(char *data){
+  unsigned long flags;
+    local_irq_save(flags);
+        console_print(data);
+    local_irq_restore(flags);
+}
+char scrn[2];
+void
+CP(char data){
+  unsigned long flags;
+    local_irq_save(flags);
+        scrn[0] = data;
+        console_print(scrn);
+    local_irq_restore(flags);
+}/* CP */
+
+void CP1(int data) { (data<10)?  CP(data+'0'): CP(data+'A'-10); }/* CP1 */
+void CP2(int data) { CP1((data>>4) & 0x0f); CP1( data & 0x0f); }/* CP2 */
+void CP4(int data) { CP2((data>>8) & 0xff); CP2(data & 0xff); }/* CP4 */
+void CP8(long data) { CP4((data>>16) & 0xffff); CP4(data & 0xffff); }/* CP8 */
+#endif
+
+/* This routine waits up to 1000 micro-seconds for the previous
+   command to the Cirrus chip to complete and then issues the
+   new command.  An error is returned if the previous command
+   didn't finish within the time limit.
+ */
+u_short
+write_cy_cmd(volatile u_char *base_addr, u_char cmd)
+{
+  unsigned long flags;
+  volatile int  i;
+
+    local_irq_save(flags);
+	/* Check to see that the previous command has completed */
+	for(i = 0 ; i < 100 ; i++){
+	    if (base_addr[CyCCR] == 0){
+		break;
+	    }
+	    my_udelay(10L);
+	}
+	/* if the CCR never cleared, the previous command
+	    didn't finish within the "reasonable time" */
+	if ( i == 10 ) {
+	    local_irq_restore(flags);
+	    return (-1);
+	}
+
+	/* Issue the new command */
+	base_addr[CyCCR] = cmd;
+    local_irq_restore(flags);
+    return(0);
+} /* write_cy_cmd */
+
+
+/* cy_start and cy_stop provide software output flow control as a
+   function of XON/XOFF, software CTS, and other such stuff. */
+
+static void
+cy_stop(struct tty_struct *tty)
+{
+  struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
+  volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
+  int channel;
+  unsigned long flags;
+
+#ifdef SERIAL_DEBUG_OTHER
+    printk("cy_stop %s\n", tty->name); /* */
+#endif
+
+    if (serial_paranoia_check(info, tty->name, "cy_stop"))
+	return;
+	
+    channel = info->line;
+
+    local_irq_save(flags);
+        base_addr[CyCAR] = (u_char)(channel); /* index channel */
+        base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
+    local_irq_restore(flags);
+
+    return;
+} /* cy_stop */
+
+static void
+cy_start(struct tty_struct *tty)
+{
+  struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
+  volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
+  int channel;
+  unsigned long flags;
+
+#ifdef SERIAL_DEBUG_OTHER
+    printk("cy_start %s\n", tty->name); /* */
+#endif
+
+    if (serial_paranoia_check(info, tty->name, "cy_start"))
+	return;
+	
+    channel = info->line;
+
+    local_irq_save(flags);
+        base_addr[CyCAR] = (u_char)(channel);
+        base_addr[CyIER] |= CyTxMpty;
+    local_irq_restore(flags);
+
+    return;
+} /* cy_start */
+
+
+/*
+ * This routine is used by the interrupt handler to schedule
+ * processing in the software interrupt portion of the driver
+ * (also known as the "bottom half").  This can be called any
+ * number of times for any channel without harm.
+ */
+static inline void
+cy_sched_event(struct cyclades_port *info, int event)
+{
+    info->event |= 1 << event; /* remember what kind of event and who */
+    schedule_work(&info->tqueue);
+} /* cy_sched_event */
+
+
+/* The real interrupt service routines are called
+   whenever the card wants its hand held--chars
+   received, out buffer empty, modem change, etc.
+ */
+static irqreturn_t
+cd2401_rxerr_interrupt(int irq, void *dev_id, struct pt_regs *fp)
+{
+    struct tty_struct *tty;
+    struct cyclades_port *info;
+    volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
+    unsigned char err, rfoc;
+    int channel;
+    char data;
+
+    /* determine the channel and change to that context */
+    channel = (u_short ) (base_addr[CyLICR] >> 2);
+    info = &cy_port[channel];
+    info->last_active = jiffies;
+
+    if ((err = base_addr[CyRISR]) & CyTIMEOUT) {
+	/* This is a receive timeout interrupt, ignore it */
+	base_addr[CyREOIR] = CyNOTRANS;
+	return IRQ_HANDLED;
+    }
+
+    /* Read a byte of data if there is any - assume the error
+     * is associated with this character */
+
+    if ((rfoc = base_addr[CyRFOC]) != 0)
+	data = base_addr[CyRDR];
+    else
+	data = 0;
+
+    /* if there is nowhere to put the data, discard it */
+    if(info->tty == 0) {
+	base_addr[CyREOIR] = rfoc ? 0 : CyNOTRANS;
+	return IRQ_HANDLED;
+    }
+    else { /* there is an open port for this data */
+	tty = info->tty;
+	if(err & info->ignore_status_mask){
+	    base_addr[CyREOIR] = rfoc ? 0 : CyNOTRANS;
+	    return IRQ_HANDLED;
+	}
+	if (tty->flip.count < TTY_FLIPBUF_SIZE){
+	    tty->flip.count++;
+	    if (err & info->read_status_mask){
+		if(err & CyBREAK){
+		    *tty->flip.flag_buf_ptr++ = TTY_BREAK;
+		    *tty->flip.char_buf_ptr++ = data;
+		    if (info->flags & ASYNC_SAK){
+			do_SAK(tty);
+		    }
+		}else if(err & CyFRAME){
+		    *tty->flip.flag_buf_ptr++ = TTY_FRAME;
+		    *tty->flip.char_buf_ptr++ = data;
+		}else if(err & CyPARITY){
+		    *tty->flip.flag_buf_ptr++ = TTY_PARITY;
+		    *tty->flip.char_buf_ptr++ = data;
+		}else if(err & CyOVERRUN){
+		    *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
+		    *tty->flip.char_buf_ptr++ = 0;
+		    /*
+		       If the flip buffer itself is
+		       overflowing, we still loose
+		       the next incoming character.
+		     */
+		    if(tty->flip.count < TTY_FLIPBUF_SIZE){
+			tty->flip.count++;
+			*tty->flip.flag_buf_ptr++ = TTY_NORMAL;
+			*tty->flip.char_buf_ptr++ = data;
+		    }
+		/* These two conditions may imply */
+		/* a normal read should be done. */
+		/* else if(data & CyTIMEOUT) */
+		/* else if(data & CySPECHAR) */
+		}else{
+		    *tty->flip.flag_buf_ptr++ = 0;
+		    *tty->flip.char_buf_ptr++ = 0;
+		}
+	    }else{
+		*tty->flip.flag_buf_ptr++ = 0;
+		*tty->flip.char_buf_ptr++ = 0;
+	    }
+	}else{
+	    /* there was a software buffer overrun
+	       and nothing could be done about it!!! */
+	}
+    }
+    schedule_delayed_work(&tty->flip.work, 1);
+    /* end of service */
+    base_addr[CyREOIR] = rfoc ? 0 : CyNOTRANS;
+    return IRQ_HANDLED;
+} /* cy_rxerr_interrupt */
+
+static irqreturn_t
+cd2401_modem_interrupt(int irq, void *dev_id, struct pt_regs *fp)
+{
+    struct cyclades_port *info;
+    volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
+    int channel;
+    int mdm_change;
+    int mdm_status;
+
+
+    /* determine the channel and change to that context */
+    channel = (u_short ) (base_addr[CyLICR] >> 2);
+    info = &cy_port[channel];
+    info->last_active = jiffies;
+
+    mdm_change = base_addr[CyMISR];
+    mdm_status = base_addr[CyMSVR1];
+
+    if(info->tty == 0){ /* nowhere to put the data, ignore it */
+	;
+    }else{
+	if((mdm_change & CyDCD)
+	&& (info->flags & ASYNC_CHECK_CD)){
+	    if(mdm_status & CyDCD){
+/* CP('!'); */
+		cy_sched_event(info, Cy_EVENT_OPEN_WAKEUP);
+	    } else {
+/* CP('@'); */
+		cy_sched_event(info, Cy_EVENT_HANGUP);
+	    }
+	}
+	if((mdm_change & CyCTS)
+	&& (info->flags & ASYNC_CTS_FLOW)){
+	    if(info->tty->stopped){
+		if(mdm_status & CyCTS){
+		    /* !!! cy_start isn't used because... */
+		    info->tty->stopped = 0;
+        	    base_addr[CyIER] |= CyTxMpty;
+		    cy_sched_event(info, Cy_EVENT_WRITE_WAKEUP);
+		}
+	    }else{
+		if(!(mdm_status & CyCTS)){
+		    /* !!! cy_stop isn't used because... */
+		    info->tty->stopped = 1;
+        	    base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
+		}
+	    }
+	}
+	if(mdm_status & CyDSR){
+	}
+    }
+    base_addr[CyMEOIR] = 0;
+    return IRQ_HANDLED;
+} /* cy_modem_interrupt */
+
+static irqreturn_t
+cd2401_tx_interrupt(int irq, void *dev_id, struct pt_regs *fp)
+{
+    struct cyclades_port *info;
+    volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
+    int channel;
+    int char_count, saved_cnt;
+    int outch;
+
+    /* determine the channel and change to that context */
+    channel = (u_short ) (base_addr[CyLICR] >> 2);
+
+#ifdef CONFIG_REMOTE_DEBUG
+    if (channel == DEBUG_PORT) {
+	panic ("TxInt on debug port!!!");
+    }
+#endif
+
+    info = &cy_port[channel];
+
+    /* validate the port number (as configured and open) */
+    if( (channel < 0) || (NR_PORTS <= channel) ){
+	base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
+	base_addr[CyTEOIR] = CyNOTRANS;
+	return IRQ_HANDLED;
+    }
+    info->last_active = jiffies;
+    if(info->tty == 0){
+	base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
+        if (info->xmit_cnt < WAKEUP_CHARS) {
+	    cy_sched_event(info, Cy_EVENT_WRITE_WAKEUP);
+        }
+	base_addr[CyTEOIR] = CyNOTRANS;
+	return IRQ_HANDLED;
+    }
+
+    /* load the on-chip space available for outbound data */
+    saved_cnt = char_count = base_addr[CyTFTC];
+
+    if(info->x_char) { /* send special char */
+	outch = info->x_char;
+	base_addr[CyTDR] = outch;
+	char_count--;
+	info->x_char = 0;
+    }
+
+    if (info->x_break){
+	/*  The Cirrus chip requires the "Embedded Transmit
+	    Commands" of start break, delay, and end break
+	    sequences to be sent.  The duration of the
+	    break is given in TICs, which runs at HZ
+	    (typically 100) and the PPR runs at 200 Hz,
+	    so the delay is duration * 200/HZ, and thus a
+	    break can run from 1/100 sec to about 5/4 sec.
+	    Need to check these values - RGH 141095.
+	 */
+	base_addr[CyTDR] = 0; /* start break */
+	base_addr[CyTDR] = 0x81;
+	base_addr[CyTDR] = 0; /* delay a bit */
+	base_addr[CyTDR] = 0x82;
+	base_addr[CyTDR] = info->x_break*200/HZ;
+	base_addr[CyTDR] = 0; /* terminate break */
+	base_addr[CyTDR] = 0x83;
+	char_count -= 7;
+	info->x_break = 0;
+    }
+
+    while (char_count > 0){
+	if (!info->xmit_cnt){
+	    base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
+	    break;
+	}
+	if (info->xmit_buf == 0){
+	    base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
+	    break;
+	}
+	if (info->tty->stopped || info->tty->hw_stopped){
+	    base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
+	    break;
+	}
+	/* Because the Embedded Transmit Commands have been
+	   enabled, we must check to see if the escape
+	   character, NULL, is being sent.  If it is, we
+	   must ensure that there is room for it to be
+	   doubled in the output stream.  Therefore we
+	   no longer advance the pointer when the character
+	   is fetched, but rather wait until after the check
+	   for a NULL output character. (This is necessary
+	   because there may not be room for the two chars
+	   needed to send a NULL.
+	 */
+	outch = info->xmit_buf[info->xmit_tail];
+	if( outch ){
+	    info->xmit_cnt--;
+	    info->xmit_tail = (info->xmit_tail + 1)
+				      & (PAGE_SIZE - 1);
+	    base_addr[CyTDR] = outch;
+	    char_count--;
+	}else{
+	    if(char_count > 1){
+		info->xmit_cnt--;
+		info->xmit_tail = (info->xmit_tail + 1)
+					  & (PAGE_SIZE - 1);
+		base_addr[CyTDR] = outch;
+		base_addr[CyTDR] = 0;
+		char_count--;
+		char_count--;
+	    }else{
+		break;
+	    }
+	}
+    }
+
+    if (info->xmit_cnt < WAKEUP_CHARS) {
+	cy_sched_event(info, Cy_EVENT_WRITE_WAKEUP);
+    }
+    base_addr[CyTEOIR] = (char_count != saved_cnt) ? 0 : CyNOTRANS;
+    return IRQ_HANDLED;
+} /* cy_tx_interrupt */
+
+static irqreturn_t
+cd2401_rx_interrupt(int irq, void *dev_id, struct pt_regs *fp)
+{
+    struct tty_struct *tty;
+    struct cyclades_port *info;
+    volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
+    int channel;
+    char data;
+    int char_count;
+    int save_cnt;
+
+    /* determine the channel and change to that context */
+    channel = (u_short ) (base_addr[CyLICR] >> 2);
+    info = &cy_port[channel];
+    info->last_active = jiffies;
+    save_cnt = char_count = base_addr[CyRFOC];
+
+#ifdef CONFIG_REMOTE_DEBUG
+    if (channel == DEBUG_PORT) {
+	while (char_count--) {
+            data = base_addr[CyRDR];
+	    queueDebugChar(data);
+	}
+    }
+    else
+#endif
+    /* if there is nowhere to put the data, discard it */
+    if(info->tty == 0){
+	while(char_count--){
+	    data = base_addr[CyRDR];
+	}
+    }else{ /* there is an open port for this data */
+	tty = info->tty;
+	/* load # characters available from the chip */
+
+#ifdef CYCLOM_ENABLE_MONITORING
+	++info->mon.int_count;
+	info->mon.char_count += char_count;
+	if (char_count > info->mon.char_max)
+	    info->mon.char_max = char_count;
+	info->mon.char_last = char_count;
+#endif
+	while(char_count--){
+	    data = base_addr[CyRDR];
+	    if (tty->flip.count >= TTY_FLIPBUF_SIZE){
+		continue;
+	    }
+	    tty->flip.count++;
+	    *tty->flip.flag_buf_ptr++ = TTY_NORMAL;
+	    *tty->flip.char_buf_ptr++ = data;
+#ifdef CYCLOM_16Y_HACK
+	    udelay(10L);
+#endif
+        }
+	schedule_delayed_work(&tty->flip.work, 1);
+    }
+    /* end of service */
+    base_addr[CyREOIR] = save_cnt ? 0 : CyNOTRANS;
+    return IRQ_HANDLED;
+} /* cy_rx_interrupt */
+
+/*
+ * 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
+ * cy#/_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 cy_sched_event(), and they get done here.
+ *
+ * This is done through one level of indirection--the task queue.
+ * When a hardware interrupt service routine wants service by the
+ * driver's bottom half, it enqueues the appropriate tq_struct (one
+ * per port) to the keventd work queue and sets a request flag
+ * that the work queue be processed.
+ *
+ * Although this may seem unwieldy, it gives the system a way to
+ * pass an argument (in this case the pointer to the cyclades_port
+ * structure) to the bottom half of the driver.  Previous kernels
+ * had to poll every port to see if that port needed servicing.
+ */
+static void
+do_softint(void *private_)
+{
+  struct cyclades_port *info = (struct cyclades_port *) private_;
+  struct tty_struct    *tty;
+
+    tty = info->tty;
+    if (!tty)
+	return;
+
+    if (test_and_clear_bit(Cy_EVENT_HANGUP, &info->event)) {
+	tty_hangup(info->tty);
+	wake_up_interruptible(&info->open_wait);
+	info->flags &= ~ASYNC_NORMAL_ACTIVE;
+    }
+    if (test_and_clear_bit(Cy_EVENT_OPEN_WAKEUP, &info->event)) {
+	wake_up_interruptible(&info->open_wait);
+    }
+    if (test_and_clear_bit(Cy_EVENT_WRITE_WAKEUP, &info->event)) {
+    	tty_wakeup(tty);
+    }
+} /* do_softint */
+
+
+/* This is called whenever a port becomes active;
+   interrupts are enabled and DTR & RTS are turned on.
+ */
+static int
+startup(struct cyclades_port * info)
+{
+  unsigned long flags;
+  volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
+  int channel;
+
+    if (info->flags & ASYNC_INITIALIZED){
+	return 0;
+    }
+
+    if (!info->type){
+	if (info->tty){
+	    set_bit(TTY_IO_ERROR, &info->tty->flags);
+	}
+	return 0;
+    }
+    if (!info->xmit_buf){
+	info->xmit_buf = (unsigned char *) get_zeroed_page (GFP_KERNEL);
+	if (!info->xmit_buf){
+	    return -ENOMEM;
+	}
+    }
+
+    config_setup(info);
+
+    channel = info->line;
+
+#ifdef SERIAL_DEBUG_OPEN
+    printk("startup channel %d\n", channel);
+#endif
+
+    local_irq_save(flags);
+	base_addr[CyCAR] = (u_char)channel;
+	write_cy_cmd(base_addr,CyENB_RCVR|CyENB_XMTR);
+
+	base_addr[CyCAR] = (u_char)channel; /* !!! Is this needed? */
+	base_addr[CyMSVR1] = CyRTS;
+/* CP('S');CP('1'); */
+	base_addr[CyMSVR2] = CyDTR;
+
+#ifdef SERIAL_DEBUG_DTR
+        printk("cyc: %d: raising DTR\n", __LINE__);
+        printk("     status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
+#endif
+
+	base_addr[CyIER] |= CyRxData;
+	info->flags |= ASYNC_INITIALIZED;
+
+	if (info->tty){
+	    clear_bit(TTY_IO_ERROR, &info->tty->flags);
+	}
+	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+
+    local_irq_restore(flags);
+
+#ifdef SERIAL_DEBUG_OPEN
+    printk(" done\n");
+#endif
+    return 0;
+} /* startup */
+
+void
+start_xmit( struct cyclades_port *info )
+{
+  unsigned long flags;
+  volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
+  int channel;
+
+    channel = info->line;
+    local_irq_save(flags);
+	base_addr[CyCAR] = channel;
+	base_addr[CyIER] |= CyTxMpty;
+    local_irq_restore(flags);
+} /* start_xmit */
+
+/*
+ * This routine shuts down a serial port; interrupts are disabled,
+ * and DTR is dropped if the hangup on close termio flag is on.
+ */
+static void
+shutdown(struct cyclades_port * info)
+{
+  unsigned long flags;
+  volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
+  int channel;
+
+    if (!(info->flags & ASYNC_INITIALIZED)){
+/* CP('$'); */
+	return;
+    }
+
+    channel = info->line;
+
+#ifdef SERIAL_DEBUG_OPEN
+    printk("shutdown channel %d\n", channel);
+#endif
+
+    /* !!! REALLY MUST WAIT FOR LAST CHARACTER TO BE
+       SENT BEFORE DROPPING THE LINE !!!  (Perhaps
+       set some flag that is read when XMTY happens.)
+       Other choices are to delay some fixed interval
+       or schedule some later processing.
+     */
+    local_irq_save(flags);
+	if (info->xmit_buf){
+	    free_page((unsigned long) info->xmit_buf);
+	    info->xmit_buf = 0;
+	}
+
+	base_addr[CyCAR] = (u_char)channel;
+	if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) {
+	    base_addr[CyMSVR1] = 0;
+/* CP('C');CP('1'); */
+	    base_addr[CyMSVR2] = 0;
+#ifdef SERIAL_DEBUG_DTR
+            printk("cyc: %d: dropping DTR\n", __LINE__);
+            printk("     status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
+#endif
+        }
+	write_cy_cmd(base_addr,CyDIS_RCVR);
+         /* it may be appropriate to clear _XMIT at
+           some later date (after testing)!!! */
+
+	if (info->tty){
+	    set_bit(TTY_IO_ERROR, &info->tty->flags);
+	}
+	info->flags &= ~ASYNC_INITIALIZED;
+    local_irq_restore(flags);
+
+#ifdef SERIAL_DEBUG_OPEN
+    printk(" done\n");
+#endif
+    return;
+} /* shutdown */
+
+/*
+ * This routine finds or computes the various line characteristics.
+ */
+static void
+config_setup(struct cyclades_port * info)
+{
+  unsigned long flags;
+  volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
+  int channel;
+  unsigned cflag;
+  int   i;
+  unsigned char ti, need_init_chan = 0;
+
+    if (!info->tty || !info->tty->termios){
+        return;
+    }
+    if (info->line == -1){
+        return;
+    }
+    cflag = info->tty->termios->c_cflag;
+
+    /* baud rate */
+    i = cflag & CBAUD;
+#ifdef CBAUDEX
+/* Starting with kernel 1.1.65, there is direct support for
+   higher baud rates.  The following code supports those
+   changes.  The conditional aspect allows this driver to be
+   used for earlier as well as later kernel versions.  (The
+   mapping is slightly different from serial.c because there
+   is still the possibility of supporting 75 kbit/sec with
+   the Cyclades board.)
+ */
+    if (i & CBAUDEX) {
+	if (i == B57600)
+	    i = 16;
+	else if(i == B115200) 
+	    i = 18;
+#ifdef B78600
+	else if(i == B78600) 
+	    i = 17;
+#endif
+	else
+	    info->tty->termios->c_cflag &= ~CBAUDEX;
+    }
+#endif
+    if (i == 15) {
+	    if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
+		    i += 1;
+	    if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
+		    i += 3;
+    }
+    /* Don't ever change the speed of the console port.  It will
+     * run at the speed specified in bootinfo, or at 19.2K */
+    /* Actually, it should run at whatever speed 166Bug was using */
+    /* Note info->timeout isn't used at present */
+    if (info != serial_console_info) {
+	info->tbpr = baud_bpr[i]; /* Tx BPR */
+	info->tco = baud_co[i]; /* Tx CO */
+	info->rbpr = baud_bpr[i]; /* Rx BPR */
+	info->rco = baud_co[i] >> 5; /* Rx CO */
+	if (baud_table[i] == 134) {
+            info->timeout = (info->xmit_fifo_size*HZ*30/269) + 2;
+            /* get it right for 134.5 baud */
+	} else if (baud_table[i]) {
+            info->timeout = (info->xmit_fifo_size*HZ*15/baud_table[i]) + 2;
+        /* this needs to be propagated into the card info */
+	} else {
+            info->timeout = 0;
+	}
+    }
+    /* By tradition (is it a standard?) a baud rate of zero
+       implies the line should be/has been closed.  A bit
+       later in this routine such a test is performed. */
+
+    /* byte size and parity */
+    info->cor7 = 0;
+    info->cor6 = 0;
+    info->cor5 = 0;
+    info->cor4 = (info->default_threshold
+		  ? info->default_threshold
+		  : baud_cor4[i]); /* receive threshold */
+    /* Following two lines added 101295, RGH. */
+    /* It is obviously wrong to access CyCORx, and not info->corx here,
+     * try and remember to fix it later! */
+    channel = info->line;
+    base_addr[CyCAR] = (u_char)channel;
+    if (C_CLOCAL(info->tty)) {
+	if (base_addr[CyIER] & CyMdmCh)
+	    base_addr[CyIER] &= ~CyMdmCh; /* without modem intr */
+			       /* ignore 1->0 modem transitions */
+	if (base_addr[CyCOR4] & (CyDSR|CyCTS|CyDCD))
+	    base_addr[CyCOR4] &= ~(CyDSR|CyCTS|CyDCD);
+			       /* ignore 0->1 modem transitions */
+	if (base_addr[CyCOR5] & (CyDSR|CyCTS|CyDCD))
+	    base_addr[CyCOR5] &= ~(CyDSR|CyCTS|CyDCD);
+    } else {
+	if ((base_addr[CyIER] & CyMdmCh) != CyMdmCh)
+	    base_addr[CyIER] |= CyMdmCh; /* with modem intr */
+			       /* act on 1->0 modem transitions */
+	if ((base_addr[CyCOR4] & (CyDSR|CyCTS|CyDCD)) != (CyDSR|CyCTS|CyDCD))
+	    base_addr[CyCOR4] |= CyDSR|CyCTS|CyDCD;
+			       /* act on 0->1 modem transitions */
+	if ((base_addr[CyCOR5] & (CyDSR|CyCTS|CyDCD)) != (CyDSR|CyCTS|CyDCD))
+	    base_addr[CyCOR5] |= CyDSR|CyCTS|CyDCD;
+    }
+    info->cor3 = (cflag & CSTOPB) ? Cy_2_STOP : Cy_1_STOP;
+    info->cor2 = CyETC;
+    switch(cflag & CSIZE){
+    case CS5:
+        info->cor1 = Cy_5_BITS;
+        break;
+    case CS6:
+        info->cor1 = Cy_6_BITS;
+        break;
+    case CS7:
+        info->cor1 = Cy_7_BITS;
+        break;
+    case CS8:
+        info->cor1 = Cy_8_BITS;
+        break;
+    }
+    if (cflag & PARENB){
+        if (cflag & PARODD){
+            info->cor1 |= CyPARITY_O;
+        }else{
+            info->cor1 |= CyPARITY_E;
+        }
+    }else{
+        info->cor1 |= CyPARITY_NONE;
+    }
+	
+    /* CTS flow control flag */
+#if 0
+    /* Don't complcate matters for now! RGH 141095 */
+    if (cflag & CRTSCTS){
+	info->flags |= ASYNC_CTS_FLOW;
+	info->cor2 |= CyCtsAE;
+    }else{
+	info->flags &= ~ASYNC_CTS_FLOW;
+	info->cor2 &= ~CyCtsAE;
+    }
+#endif
+    if (cflag & CLOCAL)
+	info->flags &= ~ASYNC_CHECK_CD;
+    else
+	info->flags |= ASYNC_CHECK_CD;
+
+     /***********************************************
+	The hardware option, CyRtsAO, presents RTS when
+	the chip has characters to send.  Since most modems
+	use RTS as reverse (inbound) flow control, this
+	option is not used.  If inbound flow control is
+	necessary, DTR can be programmed to provide the
+	appropriate signals for use with a non-standard
+	cable.  Contact Marcio Saito for details.
+     ***********************************************/
+
+    channel = info->line;
+
+    local_irq_save(flags);
+	base_addr[CyCAR] = (u_char)channel;
+
+	/* CyCMR set once only in mvme167_init_serial() */
+	if (base_addr[CyLICR] != channel << 2)
+	    base_addr[CyLICR] = channel << 2;
+	if (base_addr[CyLIVR] != 0x5c)
+	    base_addr[CyLIVR] = 0x5c;
+
+       /* tx and rx baud rate */
+
+	if (base_addr[CyCOR1] != info->cor1)
+	    need_init_chan = 1;
+	if (base_addr[CyTCOR] != info->tco)
+	    base_addr[CyTCOR] = info->tco;
+	if (base_addr[CyTBPR] != info->tbpr)
+	    base_addr[CyTBPR] = info->tbpr;
+	if (base_addr[CyRCOR] != info->rco)
+	    base_addr[CyRCOR] = info->rco;
+	if (base_addr[CyRBPR] != info->rbpr)
+	    base_addr[CyRBPR] = info->rbpr;
+
+	/* set line characteristics  according configuration */
+
+	if (base_addr[CySCHR1] != START_CHAR(info->tty))
+	    base_addr[CySCHR1] = START_CHAR(info->tty);
+	if (base_addr[CySCHR2] != STOP_CHAR(info->tty))
+	    base_addr[CySCHR2] = STOP_CHAR(info->tty);
+	if (base_addr[CySCRL] != START_CHAR(info->tty))
+	    base_addr[CySCRL] = START_CHAR(info->tty);
+	if (base_addr[CySCRH] != START_CHAR(info->tty))
+	    base_addr[CySCRH] = START_CHAR(info->tty);
+	if (base_addr[CyCOR1] != info->cor1)
+	    base_addr[CyCOR1] = info->cor1;
+	if (base_addr[CyCOR2] != info->cor2)
+	    base_addr[CyCOR2] = info->cor2;
+	if (base_addr[CyCOR3] != info->cor3)
+	    base_addr[CyCOR3] = info->cor3;
+	if (base_addr[CyCOR4] != info->cor4)
+	    base_addr[CyCOR4] = info->cor4;
+	if (base_addr[CyCOR5] != info->cor5)
+	    base_addr[CyCOR5] = info->cor5;
+	if (base_addr[CyCOR6] != info->cor6)
+	    base_addr[CyCOR6] = info->cor6;
+	if (base_addr[CyCOR7] != info->cor7)
+	    base_addr[CyCOR7] = info->cor7;
+
+	if (need_init_chan)
+	    write_cy_cmd(base_addr,CyINIT_CHAN);