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, 1056 insertions, 0 deletions

diff --git a/drivers/char/vme_scc.c b/drivers/char/vme_scc.c
new file mode 100644
index 00000000000..19ba83635dd
--- /dev/null
+++ b/drivers/char/vme_scc.c
@@ -0,0 +1,1056 @@
+/*
+ * drivers/char/vme_scc.c: MVME147, MVME162, BVME6000 SCC serial ports
+ * implementation.
+ * Copyright 1999 Richard Hirst <richard@sleepie.demon.co.uk>
+ *
+ * Based on atari_SCC.c which was
+ *   Copyright 1994-95 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
+ *   Partially based on PC-Linux serial.c by Linus Torvalds and Theodore Ts'o
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/kdev_t.h>
+#include <asm/io.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/errno.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/mm.h>
+#include <linux/serial.h>
+#include <linux/fcntl.h>
+#include <linux/major.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/miscdevice.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <asm/setup.h>
+#include <asm/bootinfo.h>
+
+#ifdef CONFIG_MVME147_SCC
+#include <asm/mvme147hw.h>
+#endif
+#ifdef CONFIG_MVME162_SCC
+#include <asm/mvme16xhw.h>
+#endif
+#ifdef CONFIG_BVME6000_SCC
+#include <asm/bvme6000hw.h>
+#endif
+
+#include <linux/generic_serial.h>
+#include "scc.h"
+
+
+#define CHANNEL_A	0
+#define CHANNEL_B	1
+
+#define SCC_MINOR_BASE	64
+
+/* Shadows for all SCC write registers */
+static unsigned char scc_shadow[2][16];
+
+/* Location to access for SCC register access delay */
+static volatile unsigned char *scc_del = NULL;
+
+/* To keep track of STATUS_REG state for detection of Ext/Status int source */
+static unsigned char scc_last_status_reg[2];
+
+/***************************** Prototypes *****************************/
+
+/* Function prototypes */
+static void scc_disable_tx_interrupts(void * ptr);
+static void scc_enable_tx_interrupts(void * ptr);
+static void scc_disable_rx_interrupts(void * ptr);
+static void scc_enable_rx_interrupts(void * ptr);
+static int  scc_get_CD(void * ptr);
+static void scc_shutdown_port(void * ptr);
+static int scc_set_real_termios(void  *ptr);
+static void scc_hungup(void  *ptr);
+static void scc_close(void  *ptr);
+static int scc_chars_in_buffer(void * ptr);
+static int scc_open(struct tty_struct * tty, struct file * filp);
+static int scc_ioctl(struct tty_struct * tty, struct file * filp,
+                     unsigned int cmd, unsigned long arg);
+static void scc_throttle(struct tty_struct *tty);
+static void scc_unthrottle(struct tty_struct *tty);
+static irqreturn_t scc_tx_int(int irq, void *data, struct pt_regs *fp);
+static irqreturn_t scc_rx_int(int irq, void *data, struct pt_regs *fp);
+static irqreturn_t scc_stat_int(int irq, void *data, struct pt_regs *fp);
+static irqreturn_t scc_spcond_int(int irq, void *data, struct pt_regs *fp);
+static void scc_setsignals(struct scc_port *port, int dtr, int rts);
+static void scc_break_ctl(struct tty_struct *tty, int break_state);
+
+static struct tty_driver *scc_driver;
+
+struct scc_port scc_ports[2];
+
+int scc_initialized = 0;
+
+/*---------------------------------------------------------------------------
+ * Interface from generic_serial.c back here
+ *--------------------------------------------------------------------------*/
+
+static struct real_driver scc_real_driver = {
+        scc_disable_tx_interrupts,
+        scc_enable_tx_interrupts,
+        scc_disable_rx_interrupts,
+        scc_enable_rx_interrupts,
+        scc_get_CD,
+        scc_shutdown_port,
+        scc_set_real_termios,
+        scc_chars_in_buffer,
+        scc_close,
+        scc_hungup,
+        NULL
+};
+
+
+static struct tty_operations scc_ops = {
+	.open	= scc_open,
+	.close = gs_close,
+	.write = gs_write,
+	.put_char = gs_put_char,
+	.flush_chars = gs_flush_chars,
+	.write_room = gs_write_room,
+	.chars_in_buffer = gs_chars_in_buffer,
+	.flush_buffer = gs_flush_buffer,
+	.ioctl = scc_ioctl,
+	.throttle = scc_throttle,
+	.unthrottle = scc_unthrottle,
+	.set_termios = gs_set_termios,
+	.stop = gs_stop,
+	.start = gs_start,
+	.hangup = gs_hangup,
+	.break_ctl = scc_break_ctl,
+};
+
+/*----------------------------------------------------------------------------
+ * vme_scc_init() and support functions
+ *---------------------------------------------------------------------------*/
+
+static int scc_init_drivers(void)
+{
+	int error;
+
+	scc_driver = alloc_tty_driver(2);
+	if (!scc_driver)
+		return -ENOMEM;
+	scc_driver->owner = THIS_MODULE;
+	scc_driver->driver_name = "scc";
+	scc_driver->name = "ttyS";
+	scc_driver->devfs_name = "tts/";
+	scc_driver->major = TTY_MAJOR;
+	scc_driver->minor_start = SCC_MINOR_BASE;
+	scc_driver->type = TTY_DRIVER_TYPE_SERIAL;
+	scc_driver->subtype = SERIAL_TYPE_NORMAL;
+	scc_driver->init_termios = tty_std_termios;
+	scc_driver->init_termios.c_cflag =
+	  B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+	scc_driver->flags = TTY_DRIVER_REAL_RAW;
+	tty_set_operations(scc_driver, &scc_ops);
+
+	if ((error = tty_register_driver(scc_driver))) {
+		printk(KERN_ERR "scc: Couldn't register scc driver, error = %d\n",
+		       error);
+		put_tty_driver(scc_driver);
+		return 1;
+	}
+
+	return 0;
+}
+
+
+/* ports[] array is indexed by line no (i.e. [0] for ttyS0, [1] for ttyS1).
+ */
+
+static void scc_init_portstructs(void)
+{
+	struct scc_port *port;
+	int i;
+
+	for (i = 0; i < 2; i++) {
+		port = scc_ports + i;
+		port->gs.magic = SCC_MAGIC;
+		port->gs.close_delay = HZ/2;
+		port->gs.closing_wait = 30 * HZ;
+		port->gs.rd = &scc_real_driver;
+#ifdef NEW_WRITE_LOCKING
+		port->gs.port_write_sem = MUTEX;
+#endif
+		init_waitqueue_head(&port->gs.open_wait);
+		init_waitqueue_head(&port->gs.close_wait);
+	}
+}
+
+
+#ifdef CONFIG_MVME147_SCC
+static int mvme147_scc_init(void)
+{
+	struct scc_port *port;
+
+	printk(KERN_INFO "SCC: MVME147 Serial Driver\n");
+	/* Init channel A */
+	port = &scc_ports[0];
+	port->channel = CHANNEL_A;
+	port->ctrlp = (volatile unsigned char *)M147_SCC_A_ADDR;
+	port->datap = port->ctrlp + 1;
+	port->port_a = &scc_ports[0];
+	port->port_b = &scc_ports[1];
+	request_irq(MVME147_IRQ_SCCA_TX, scc_tx_int, SA_INTERRUPT,
+		            "SCC-A TX", port);
+	request_irq(MVME147_IRQ_SCCA_STAT, scc_stat_int, SA_INTERRUPT,
+		            "SCC-A status", port);
+	request_irq(MVME147_IRQ_SCCA_RX, scc_rx_int, SA_INTERRUPT,
+		            "SCC-A RX", port);
+	request_irq(MVME147_IRQ_SCCA_SPCOND, scc_spcond_int, SA_INTERRUPT,
+		            "SCC-A special cond", port);
+	{
+		SCC_ACCESS_INIT(port);
+
+		/* disable interrupts for this channel */
+		SCCwrite(INT_AND_DMA_REG, 0);
+		/* Set the interrupt vector */
+		SCCwrite(INT_VECTOR_REG, MVME147_IRQ_SCC_BASE);
+		/* Interrupt parameters: vector includes status, status low */
+		SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
+		SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
+	}
+
+	/* Init channel B */
+	port = &scc_ports[1];
+	port->channel = CHANNEL_B;
+	port->ctrlp = (volatile unsigned char *)M147_SCC_B_ADDR;
+	port->datap = port->ctrlp + 1;
+	port->port_a = &scc_ports[0];
+	port->port_b = &scc_ports[1];
+	request_irq(MVME147_IRQ_SCCB_TX, scc_tx_int, SA_INTERRUPT,
+		            "SCC-B TX", port);
+	request_irq(MVME147_IRQ_SCCB_STAT, scc_stat_int, SA_INTERRUPT,
+		            "SCC-B status", port);
+	request_irq(MVME147_IRQ_SCCB_RX, scc_rx_int, SA_INTERRUPT,
+		            "SCC-B RX", port);
+	request_irq(MVME147_IRQ_SCCB_SPCOND, scc_spcond_int, SA_INTERRUPT,
+		            "SCC-B special cond", port);
+	{
+		SCC_ACCESS_INIT(port);
+
+		/* disable interrupts for this channel */
+		SCCwrite(INT_AND_DMA_REG, 0);
+	}
+
+        /* Ensure interrupts are enabled in the PCC chip */
+        m147_pcc->serial_cntrl=PCC_LEVEL_SERIAL|PCC_INT_ENAB;
+
+	/* Initialise the tty driver structures and register */
+	scc_init_portstructs();
+	scc_init_drivers();
+
+	return 0;
+}
+#endif
+
+
+#ifdef CONFIG_MVME162_SCC
+static int mvme162_scc_init(void)
+{
+	struct scc_port *port;
+
+	if (!(mvme16x_config & MVME16x_CONFIG_GOT_SCCA))
+		return (-ENODEV);
+
+	printk(KERN_INFO "SCC: MVME162 Serial Driver\n");
+	/* Init channel A */
+	port = &scc_ports[0];
+	port->channel = CHANNEL_A;
+	port->ctrlp = (volatile unsigned char *)MVME_SCC_A_ADDR;
+	port->datap = port->ctrlp + 2;
+	port->port_a = &scc_ports[0];
+	port->port_b = &scc_ports[1];
+	request_irq(MVME162_IRQ_SCCA_TX, scc_tx_int, SA_INTERRUPT,
+		            "SCC-A TX", port);
+	request_irq(MVME162_IRQ_SCCA_STAT, scc_stat_int, SA_INTERRUPT,
+		            "SCC-A status", port);
+	request_irq(MVME162_IRQ_SCCA_RX, scc_rx_int, SA_INTERRUPT,
+		            "SCC-A RX", port);
+	request_irq(MVME162_IRQ_SCCA_SPCOND, scc_spcond_int, SA_INTERRUPT,
+		            "SCC-A special cond", port);
+	{
+		SCC_ACCESS_INIT(port);
+
+		/* disable interrupts for this channel */
+		SCCwrite(INT_AND_DMA_REG, 0);
+		/* Set the interrupt vector */
+		SCCwrite(INT_VECTOR_REG, MVME162_IRQ_SCC_BASE);
+		/* Interrupt parameters: vector includes status, status low */
+		SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
+		SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
+	}
+
+	/* Init channel B */
+	port = &scc_ports[1];
+	port->channel = CHANNEL_B;
+	port->ctrlp = (volatile unsigned char *)MVME_SCC_B_ADDR;
+	port->datap = port->ctrlp + 2;
+	port->port_a = &scc_ports[0];
+	port->port_b = &scc_ports[1];
+	request_irq(MVME162_IRQ_SCCB_TX, scc_tx_int, SA_INTERRUPT,
+		            "SCC-B TX", port);
+	request_irq(MVME162_IRQ_SCCB_STAT, scc_stat_int, SA_INTERRUPT,
+		            "SCC-B status", port);
+	request_irq(MVME162_IRQ_SCCB_RX, scc_rx_int, SA_INTERRUPT,
+		            "SCC-B RX", port);
+	request_irq(MVME162_IRQ_SCCB_SPCOND, scc_spcond_int, SA_INTERRUPT,
+		            "SCC-B special cond", port);
+
+	{
+		SCC_ACCESS_INIT(port);	/* Either channel will do */
+
+		/* disable interrupts for this channel */
+		SCCwrite(INT_AND_DMA_REG, 0);
+	}
+
+        /* Ensure interrupts are enabled in the MC2 chip */
+        *(volatile char *)0xfff4201d = 0x14;
+
+	/* Initialise the tty driver structures and register */
+	scc_init_portstructs();
+	scc_init_drivers();
+
+	return 0;
+}
+#endif
+
+
+#ifdef CONFIG_BVME6000_SCC
+static int bvme6000_scc_init(void)
+{
+	struct scc_port *port;
+
+	printk(KERN_INFO "SCC: BVME6000 Serial Driver\n");
+	/* Init channel A */
+	port = &scc_ports[0];
+	port->channel = CHANNEL_A;
+	port->ctrlp = (volatile unsigned char *)BVME_SCC_A_ADDR;
+	port->datap = port->ctrlp + 4;
+	port->port_a = &scc_ports[0];
+	port->port_b = &scc_ports[1];
+	request_irq(BVME_IRQ_SCCA_TX, scc_tx_int, SA_INTERRUPT,
+		            "SCC-A TX", port);
+	request_irq(BVME_IRQ_SCCA_STAT, scc_stat_int, SA_INTERRUPT,
+		            "SCC-A status", port);
+	request_irq(BVME_IRQ_SCCA_RX, scc_rx_int, SA_INTERRUPT,
+		            "SCC-A RX", port);
+	request_irq(BVME_IRQ_SCCA_SPCOND, scc_spcond_int, SA_INTERRUPT,
+		            "SCC-A special cond", port);
+	{
+		SCC_ACCESS_INIT(port);
+
+		/* disable interrupts for this channel */
+		SCCwrite(INT_AND_DMA_REG, 0);
+		/* Set the interrupt vector */
+		SCCwrite(INT_VECTOR_REG, BVME_IRQ_SCC_BASE);
+		/* Interrupt parameters: vector includes status, status low */
+		SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
+		SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
+	}
+
+	/* Init channel B */
+	port = &scc_ports[1];
+	port->channel = CHANNEL_B;
+	port->ctrlp = (volatile unsigned char *)BVME_SCC_B_ADDR;
+	port->datap = port->ctrlp + 4;
+	port->port_a = &scc_ports[0];
+	port->port_b = &scc_ports[1];
+	request_irq(BVME_IRQ_SCCB_TX, scc_tx_int, SA_INTERRUPT,
+		            "SCC-B TX", port);
+	request_irq(BVME_IRQ_SCCB_STAT, scc_stat_int, SA_INTERRUPT,
+		            "SCC-B status", port);
+	request_irq(BVME_IRQ_SCCB_RX, scc_rx_int, SA_INTERRUPT,
+		            "SCC-B RX", port);
+	request_irq(BVME_IRQ_SCCB_SPCOND, scc_spcond_int, SA_INTERRUPT,
+		            "SCC-B special cond", port);
+
+	{
+		SCC_ACCESS_INIT(port);	/* Either channel will do */
+
+		/* disable interrupts for this channel */
+		SCCwrite(INT_AND_DMA_REG, 0);
+	}
+
+	/* Initialise the tty driver structures and register */
+	scc_init_portstructs();
+	scc_init_drivers();
+
+	return 0;
+}
+#endif
+
+
+static int vme_scc_init(void)
+{
+	int res = -ENODEV;
+
+#ifdef CONFIG_MVME147_SCC
+	if (MACH_IS_MVME147)
+		res = mvme147_scc_init();
+#endif
+#ifdef CONFIG_MVME162_SCC
+	if (MACH_IS_MVME16x)
+		res = mvme162_scc_init();
+#endif
+#ifdef CONFIG_BVME6000_SCC
+	if (MACH_IS_BVME6000)
+		res = bvme6000_scc_init();
+#endif
+	return res;
+}
+
+module_init(vme_scc_init);
+
+
+/*---------------------------------------------------------------------------
+ * Interrupt handlers
+ *--------------------------------------------------------------------------*/
+
+static irqreturn_t scc_rx_int(int irq, void *data, struct pt_regs *fp)
+{
+	unsigned char	ch;
+	struct scc_port *port = data;
+	struct tty_struct *tty = port->gs.tty;
+	SCC_ACCESS_INIT(port);
+
+	ch = SCCread_NB(RX_DATA_REG);
+	if (!tty) {
+		printk(KERN_WARNING "scc_rx_int with NULL tty!\n");
+		SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
+		return IRQ_HANDLED;
+	}
+	if (tty->flip.count < TTY_FLIPBUF_SIZE) {
+		*tty->flip.char_buf_ptr = ch;
+		*tty->flip.flag_buf_ptr = 0;
+		tty->flip.flag_buf_ptr++;
+		tty->flip.char_buf_ptr++;
+		tty->flip.count++;
+	}
+
+	/* Check if another character is already ready; in that case, the
+	 * spcond_int() function must be used, because this character may have an
+	 * error condition that isn't signalled by the interrupt vector used!
+	 */
+	if (SCCread(INT_PENDING_REG) &
+	    (port->channel == CHANNEL_A ? IPR_A_RX : IPR_B_RX)) {
+		scc_spcond_int (irq, data, fp);
+		return IRQ_HANDLED;
+	}
+
+	SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
+
+	tty_flip_buffer_push(tty);
+	return IRQ_HANDLED;
+}
+
+
+static irqreturn_t scc_spcond_int(int irq, void *data, struct pt_regs *fp)
+{
+	struct scc_port *port = data;
+	struct tty_struct *tty = port->gs.tty;
+	unsigned char	stat, ch, err;
+	int		int_pending_mask = port->channel == CHANNEL_A ?
+			                   IPR_A_RX : IPR_B_RX;
+	SCC_ACCESS_INIT(port);
+	
+	if (!tty) {
+		printk(KERN_WARNING "scc_spcond_int with NULL tty!\n");
+		SCCwrite(COMMAND_REG, CR_ERROR_RESET);
+		SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
+		return IRQ_HANDLED;
+	}
+	do {
+		stat = SCCread(SPCOND_STATUS_REG);
+		ch = SCCread_NB(RX_DATA_REG);
+
+		if (stat & SCSR_RX_OVERRUN)
+			err = TTY_OVERRUN;
+		else if (stat & SCSR_PARITY_ERR)
+			err = TTY_PARITY;
+		else if (stat & SCSR_CRC_FRAME_ERR)
+			err = TTY_FRAME;
+		else
+			err = 0;
+
+		if (tty->flip.count < TTY_FLIPBUF_SIZE) {
+			*tty->flip.char_buf_ptr = ch;
+			*tty->flip.flag_buf_ptr = err;
+			tty->flip.flag_buf_ptr++;
+			tty->flip.char_buf_ptr++;
+			tty->flip.count++;
+		}
+
+		/* ++TeSche: *All* errors have to be cleared manually,
+		 * else the condition persists for the next chars
+		 */
+		if (err)
+		  SCCwrite(COMMAND_REG, CR_ERROR_RESET);
+
+	} while(SCCread(INT_PENDING_REG) & int_pending_mask);
+
+	SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
+
+	tty_flip_buffer_push(tty);
+	return IRQ_HANDLED;
+}
+
+
+static irqreturn_t scc_tx_int(int irq, void *data, struct pt_regs *fp)
+{
+	struct scc_port *port = data;
+	SCC_ACCESS_INIT(port);
+
+	if (!port->gs.tty) {
+		printk(KERN_WARNING "scc_tx_int with NULL tty!\n");
+		SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
+		SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET);
+		SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
+		return IRQ_HANDLED;
+	}
+	while ((SCCread_NB(STATUS_REG) & SR_TX_BUF_EMPTY)) {
+		if (port->x_char) {
+			SCCwrite(TX_DATA_REG, port->x_char);
+			port->x_char = 0;
+		}
+		else if ((port->gs.xmit_cnt <= 0) || port->gs.tty->stopped ||
+				port->gs.tty->hw_stopped)
+			break;
+		else {
+			SCCwrite(TX_DATA_REG, port->gs.xmit_buf[port->gs.xmit_tail++]);
+			port->gs.xmit_tail = port->gs.xmit_tail & (SERIAL_XMIT_SIZE-1);
+			if (--port->gs.xmit_cnt <= 0)
+				break;
+		}
+	}
+	if ((port->gs.xmit_cnt <= 0) || port->gs.tty->stopped ||
+			port->gs.tty->hw_stopped) {
+		/* disable tx interrupts */
+		SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
+		SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET);   /* disable tx_int on next tx underrun? */
+		port->gs.flags &= ~GS_TX_INTEN;
+	}
+	if (port->gs.tty && port->gs.xmit_cnt <= port->gs.wakeup_chars)
+		tty_wakeup(port->gs.tty);
+
+	SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
+	return IRQ_HANDLED;
+}
+
+
+static irqreturn_t scc_stat_int(int irq, void *data, struct pt_regs *fp)
+{
+	struct scc_port *port = data;
+	unsigned channel = port->channel;
+	unsigned char	last_sr, sr, changed;
+	SCC_ACCESS_INIT(port);
+
+	last_sr = scc_last_status_reg[channel];
+	sr = scc_last_status_reg[channel] = SCCread_NB(STATUS_REG);
+	changed = last_sr ^ sr;
+
+	if (changed & SR_DCD) {
+		port->c_dcd = !!(sr & SR_DCD);
+		if (!(port->gs.flags & ASYNC_CHECK_CD))
+			;	/* Don't report DCD changes */
+		else if (port->c_dcd) {
+			wake_up_interruptible(&port->gs.open_wait);
+		}
+		else {
+			if (port->gs.tty)
+				tty_hangup (port->gs.tty);
+		}
+	}
+	SCCwrite(COMMAND_REG, CR_EXTSTAT_RESET);
+	SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
+	return IRQ_HANDLED;
+}
+
+
+/*---------------------------------------------------------------------------
+ * generic_serial.c callback funtions
+ *--------------------------------------------------------------------------*/
+
+static void scc_disable_tx_interrupts(void *ptr)
+{
+	struct scc_port *port = ptr;
+	unsigned long	flags;
+	SCC_ACCESS_INIT(port);
+
+	local_irq_save(flags);
+	SCCmod(INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
+	port->gs.flags &= ~GS_TX_INTEN;
+	local_irq_restore(flags);
+}
+
+
+static void scc_enable_tx_interrupts(void *ptr)
+{
+	struct scc_port *port = ptr;
+	unsigned long	flags;
+	SCC_ACCESS_INIT(port);
+
+	local_irq_save(flags);
+	SCCmod(INT_AND_DMA_REG, 0xff, IDR_TX_INT_ENAB);
+	/* restart the transmitter */
+	scc_tx_int (0, port, 0);
+	local_irq_restore(flags);
+}
+
+
+static void scc_disable_rx_interrupts(void *ptr)
+{
+	struct scc_port *port = ptr;
+	unsigned long	flags;
+	SCC_ACCESS_INIT(port);
+
+	local_irq_save(flags);
+	SCCmod(INT_AND_DMA_REG,
+	    ~(IDR_RX_INT_MASK|IDR_PARERR_AS_SPCOND|IDR_EXTSTAT_INT_ENAB), 0);
+	local_irq_restore(flags);
+}
+
+
+static void scc_enable_rx_interrupts(void *ptr)
+{
+	struct scc_port *port = ptr;
+	unsigned long	flags;
+	SCC_ACCESS_INIT(port);
+
+	local_irq_save(flags);
+	SCCmod(INT_AND_DMA_REG, 0xff,
+		IDR_EXTSTAT_INT_ENAB|IDR_PARERR_AS_SPCOND|IDR_RX_INT_ALL);
+	local_irq_restore(flags);
+}
+
+
+static int scc_get_CD(void *ptr)
+{
+	struct scc_port *port = ptr;
+	unsigned channel = port->channel;
+
+	return !!(scc_last_status_reg[channel] & SR_DCD);
+}
+
+
+static void scc_shutdown_port(void *ptr)
+{
+	struct scc_port *port = ptr;
+
+	port->gs.flags &= ~ GS_ACTIVE;
+	if (port->gs.tty && port->gs.tty->termios->c_cflag & HUPCL) {
+		scc_setsignals (port, 0, 0);
+	}
+}
+
+
+static int scc_set_real_termios (void *ptr)
+{
+	/* the SCC has char sizes 5,7,6,8 in that order! */
+	static int chsize_map[4] = { 0, 2, 1, 3 };
+	unsigned cflag, baud, chsize, channel, brgval = 0;
+	unsigned long flags;
+	struct scc_port *port = ptr;
+	SCC_ACCESS_INIT(port);
+
+	if (!port->gs.tty || !port->gs.tty->termios) return 0;
+
+	channel = port->channel;
+
+	if (channel == CHANNEL_A)
+		return 0;		/* Settings controlled by boot PROM */
+
+	cflag  = port->gs.tty->termios->c_cflag;
+	baud = port->gs.baud;
+	chsize = (cflag & CSIZE) >> 4;
+
+	if (baud == 0) {
+		/* speed == 0 -> drop DTR */
+		local_irq_save(flags);
+		SCCmod(TX_CTRL_REG, ~TCR_DTR, 0);
+		local_irq_restore(flags);
+		return 0;
+	}
+	else if ((MACH_IS_MVME16x && (baud < 50 || baud > 38400)) ||
+		 (MACH_IS_MVME147 && (baud < 50 || baud > 19200)) ||
+		 (MACH_IS_BVME6000 &&(baud < 50 || baud > 76800))) {
+		printk(KERN_NOTICE "SCC: Bad speed requested, %d\n", baud);
+		return 0;
+	}
+
+	if (cflag & CLOCAL)
+		port->gs.flags &= ~ASYNC_CHECK_CD;
+	else
+		port->gs.flags |= ASYNC_CHECK_CD;
+
+#ifdef CONFIG_MVME147_SCC
+	if (MACH_IS_MVME147)
+		brgval = (M147_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
+#endif
+#ifdef CONFIG_MVME162_SCC
+	if (MACH_IS_MVME16x)
+		brgval = (MVME_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
+#endif
+#ifdef CONFIG_BVME6000_SCC
+	if (MACH_IS_BVME6000)
+		brgval = (BVME_SCC_RTxC + baud/2) / (16 * 2 * baud) - 2;
+#endif
+	/* Now we have all parameters and can go to set them: */
+	local_irq_save(flags);
+
+	/* receiver's character size and auto-enables */
+	SCCmod(RX_CTRL_REG, ~(RCR_CHSIZE_MASK|RCR_AUTO_ENAB_MODE),
+			(chsize_map[chsize] << 6) |
+			((cflag & CRTSCTS) ? RCR_AUTO_ENAB_MODE : 0));
+	/* parity and stop bits (both, Tx and Rx), clock mode never changes */
+	SCCmod (AUX1_CTRL_REG,
+		~(A1CR_PARITY_MASK | A1CR_MODE_MASK),
+		((cflag & PARENB
+		  ? (cflag & PARODD ? A1CR_PARITY_ODD : A1CR_PARITY_EVEN)
+		  : A1CR_PARITY_NONE)
+		 | (cflag & CSTOPB ? A1CR_MODE_ASYNC_2 : A1CR_MODE_ASYNC_1)));
+	/* sender's character size, set DTR for valid baud rate */
+	SCCmod(TX_CTRL_REG, ~TCR_CHSIZE_MASK, chsize_map[chsize] << 5 | TCR_DTR);
+	/* clock sources never change */
+	/* disable BRG before changing the value */
+	SCCmod(DPLL_CTRL_REG, ~DCR_BRG_ENAB, 0);
+	/* BRG value */
+	SCCwrite(TIMER_LOW_REG, brgval & 0xff);
+	SCCwrite(TIMER_HIGH_REG, (brgval >> 8) & 0xff);
+	/* BRG enable, and clock source never changes */
+	SCCmod(DPLL_CTRL_REG, 0xff, DCR_BRG_ENAB);
+
+	local_irq_restore(flags);
+
+	return 0;
+}
+
+
+static int scc_chars_in_buffer (void *ptr)
+{
+	struct scc_port *port = ptr;
+	SCC_ACCESS_INIT(port);
+
+	return (SCCread (SPCOND_STATUS_REG) & SCSR_ALL_SENT) ? 0  : 1;
+}
+
+
+/* Comment taken from sx.c (2.4.0):
+   I haven't the foggiest why the decrement use count has to happen
+   here. The whole linux serial drivers stuff needs to be redesigned.
+   My guess is that this is a hack to minimize the impact of a bug
+   elsewhere. Thinking about it some more. (try it sometime) Try
+   running minicom on a serial port that is driven by a modularized
+   driver. Have the modem hangup. Then remove the driver module. Then
+   exit minicom.  I expect an "oops".  -- REW */
+
+static void scc_hungup(void *ptr)
+{
+	scc_disable_tx_interrupts(ptr);
+	scc_disable_rx_interrupts(ptr);
+}
+
+
+static void scc_close(void *ptr)
+{
+	scc_disable_tx_interrupts(ptr);
+	scc_disable_rx_interrupts(ptr);
+}
+
+
+/*---------------------------------------------------------------------------
+ * Internal support functions
+ *--------------------------------------------------------------------------*/
+
+static void scc_setsignals(struct scc_port *port, int dtr, int rts)
+{
+	unsigned long flags;
+	unsigned char t;
+	SCC_ACCESS_INIT(port);
+
+	local_irq_save(flags);
+	t = SCCread(TX_CTRL_REG);
+	if (dtr >= 0) t = dtr? (t | TCR_DTR): (t & ~TCR_DTR);
+	if (rts >= 0) t = rts? (t | TCR_RTS): (t & ~TCR_RTS);
+	SCCwrite(TX_CTRL_REG, t);
+	local_irq_restore(flags);
+}
+
+
+static void scc_send_xchar(struct tty_struct *tty, char ch)
+{
+	struct scc_port *port = (struct scc_port *)tty->driver_data;
+
+	port->x_char = ch;
+	if (ch)
+		scc_enable_tx_interrupts(port);
+}
+
+
+/*---------------------------------------------------------------------------
+ * Driver entrypoints referenced from above
+ *--------------------------------------------------------------------------*/
+
+static int scc_open (struct tty_struct * tty, struct file * filp)
+{
+	int line = tty->index;
+	int retval;
+	struct scc_port *port = &scc_ports[line];
+	int i, channel = port->channel;
+	unsigned long	flags;
+	SCC_ACCESS_INIT(port);
+#if defined(CONFIG_MVME162_SCC) || defined(CONFIG_MVME147_SCC)
+	static const struct {
+		unsigned reg, val;
+	} mvme_init_tab[] = {
+		/* Values for MVME162 and MVME147 */
+		/* no parity, 1 stop bit, async, 1:16 */
+		{ AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 },
+		/* parity error is special cond, ints disabled, no DMA */
+		{ INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB },
+		/* Rx 8 bits/char, no auto enable, Rx off */
+		{ RX_CTRL_REG, RCR_CHSIZE_8 },
+		/* DTR off, Tx 8 bits/char, RTS off, Tx off */
+		{ TX_CTRL_REG, TCR_CHSIZE_8 },
+		/* special features off */
+		{ AUX2_CTRL_REG, 0 },
+		{ CLK_CTRL_REG, CCR_RXCLK_BRG | CCR_TXCLK_BRG },
+		{ DPLL_CTRL_REG, DCR_BRG_ENAB | DCR_BRG_USE_PCLK },
+		/* Start Rx */
+		{ RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 },
+		/* Start Tx */
+		{ TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 },
+		/* Ext/Stat ints: DCD only */
+		{ INT_CTRL_REG, ICR_ENAB_DCD_INT },
+		/* Reset Ext/Stat ints */
+		{ COMMAND_REG, CR_EXTSTAT_RESET },
+		/* ...again */
+		{ COMMAND_REG, CR_EXTSTAT_RESET },
+	};
+#endif
+#if defined(CONFIG_BVME6000_SCC)
+	static const struct {
+		unsigned reg, val;
+	} bvme_init_tab[] = {
+		/* Values for BVME6000 */
+		/* no parity, 1 stop bit, async, 1:16 */
+		{ AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 },
+		/* parity error is special cond, ints disabled, no DMA */
+		{ INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB },
+		/* Rx 8 bits/char, no auto enable, Rx off */
+		{ RX_CTRL_REG, RCR_CHSIZE_8 },
+		/* DTR off, Tx 8 bits/char, RTS off, Tx off */
+		{ TX_CTRL_REG, TCR_CHSIZE_8 },
+		/* special features off */
+		{ AUX2_CTRL_REG, 0 },
+		{ CLK_CTRL_REG, CCR_RTxC_XTAL | CCR_RXCLK_BRG | CCR_TXCLK_BRG },
+		{ DPLL_CTRL_REG, DCR_BRG_ENAB },
+		/* Start Rx */
+		{ RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 },
+		/* Start Tx */
+		{ TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 },
+		/* Ext/Stat ints: DCD only */
+		{ INT_CTRL_REG, ICR_ENAB_DCD_INT },
+		/* Reset Ext/Stat ints */
+		{ COMMAND_REG, CR_EXTSTAT_RESET },
+		/* ...again */
+		{ COMMAND_REG, CR_EXTSTAT_RESET },
+	};
+#endif
+	if (!(port->gs.flags & ASYNC_INITIALIZED)) {
+		local_irq_save(flags);
+#if defined(CONFIG_MVME147_SCC) || defined(CONFIG_MVME162_SCC)
+		if (MACH_IS_MVME147 || MACH_IS_MVME16x) {
+			for (i=0; i<sizeof(mvme_init_tab)/sizeof(*mvme_init_tab); ++i)
+				SCCwrite(mvme_init_tab[i].reg, mvme_init_tab[i].val);
+		}
+#endif
+#if defined(CONFIG_BVME6000_SCC)
+		if (MACH_IS_BVME6000) {
+			for (i=0; i<sizeof(bvme_init_tab)/sizeof(*bvme_init_tab); ++i)
+				SCCwrite(bvme_init_tab[i].reg, bvme_init_tab[i].val);
+		}
+#endif
+
+		/* remember status register for detection of DCD and CTS changes */
+		scc_last_status_reg[channel] = SCCread(STATUS_REG);
+
+		port->c_dcd = 0;	/* Prevent initial 1->0 interrupt */
+		scc_setsignals (port, 1,1);
+		local_irq_restore(flags);
+	}
+
+	tty->driver_data = port;
+	port->gs.tty = tty;
+	port->gs.count++;
+	retval = gs_init_port(&port->gs);
+	if (retval) {
+		port->gs.count--;
+		return retval;
+	}
+	port->gs.flags |= GS_ACTIVE;
+	retval = gs_block_til_ready(port, filp);
+
+	if (retval) {
+		port->gs.count--;
+		return retval;
+	}
+
+	port->c_dcd = scc_get_CD (port);
+
+	scc_enable_rx_interrupts(port);
+
+	return 0;
+}
+
+
+static void scc_throttle (struct tty_struct * tty)
+{
+	struct scc_port *port = (struct scc_port *)tty->driver_data;
+	unsigned long	flags;
+	SCC_ACCESS_INIT(port);
+
+	if (tty->termios->c_cflag & CRTSCTS) {
+		local_irq_save(flags);
+		SCCmod(TX_CTRL_REG, ~TCR_RTS, 0);
+		local_irq_restore(flags);
+	}
+	if (I_IXOFF(tty))
+		scc_send_xchar(tty, STOP_CHAR(tty));
+}
+
+
+static void scc_unthrottle (struct tty_struct * tty)
+{
+	struct scc_port *port = (struct scc_port *)tty->driver_data;
+	unsigned long	flags;
+	SCC_ACCESS_INIT(port);
+
+	if (tty->termios->c_cflag & CRTSCTS) {
+		local_irq_save(flags);
+		SCCmod(TX_CTRL_REG, 0xff, TCR_RTS);
+		local_irq_restore(flags);
+	}
+	if (I_IXOFF(tty))
+		scc_send_xchar(tty, START_CHAR(tty));
+}
+
+
+static int scc_ioctl(struct tty_struct *tty, struct file *file,
+		     unsigned int cmd, unsigned long arg)
+{
+	return -ENOIOCTLCMD;
+}
+
+
+static void scc_break_ctl(struct tty_struct *tty, int break_state)
+{
+	struct scc_port *port = (struct scc_port *)tty->driver_data;
+	unsigned long	flags;
+	SCC_ACCESS_INIT(port);
+
+	local_irq_save(flags);
+	SCCmod(TX_CTRL_REG, ~TCR_SEND_BREAK, 
+			break_state ? TCR_SEND_BREAK : 0);
+	local_irq_restore(flags);
+}
+
+
+/*---------------------------------------------------------------------------
+ * Serial console stuff...
+ *--------------------------------------------------------------------------*/
+
+#define scc_delay() do { __asm__ __volatile__ (" nop; nop"); } while (0)
+
+static void scc_ch_write (char ch)
+{
+	volatile char *p = NULL;
+	
+#ifdef CONFIG_MVME147_SCC
+	if (MACH_IS_MVME147)
+		p = (volatile char *)M147_SCC_A_ADDR;
+#endif
+#ifdef CONFIG_MVME162_SCC
+	if (MACH_IS_MVME16x)
+		p = (volatile char *)MVME_SCC_A_ADDR;
+#endif
+#ifdef CONFIG_BVME6000_SCC
+	if (MACH_IS_BVME6000)
+		p = (volatile char *)BVME_SCC_A_ADDR;
+#endif
+
+	do {
+		scc_delay();
+	}
+	while (!(*p & 4));
+	scc_delay();
+	*p = 8;
+	scc_delay();
+	*p = ch;
+}
+
+/* The console must be locked when we get here. */
+
+static void scc_console_write (struct console *co, const char *str, unsigned count)
+{
+	unsigned long	flags;
+
+	local_irq_save(flags);
+
+	while (count--)
+	{
+		if (*str == '\n')
+			scc_ch_write ('\r');
+		scc_ch_write (*str++);
+	}
+	local_irq_restore(flags);
+}
+
+static struct tty_driver *scc_console_device(struct console *c, int *index)
+{
+	*index = c->index;
+	return scc_driver;
+}
+
+
+static int __init scc_console_setup(struct console *co, char *options)
+{
+	return 0;
+}
+
+
+static struct console sercons = {
+	.name		= "ttyS",
+	.write		= scc_console_write,
+	.device		= scc_console_device,
+	.setup		= scc_console_setup,
+	.flags		= CON_PRINTBUFFER,
+	.index		= -1,
+};
+
+
+static int __init vme_scc_console_init(void)
+{
+	if (vme_brdtype == VME_TYPE_MVME147 ||
+			vme_brdtype == VME_TYPE_MVME162 ||
+			vme_brdtype == VME_TYPE_MVME172 ||
+			vme_brdtype == VME_TYPE_BVME4000 ||
+			vme_brdtype == VME_TYPE_BVME6000)
+		register_console(&sercons);
+	return 0;
+}
+console_initcall(vme_scc_console_init);