summaryrefslogtreecommitdiff
path: root/drivers/char/vme_scc.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/char/vme_scc.c
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!
Diffstat (limited to 'drivers/char/vme_scc.c')
-rw-r--r--drivers/char/vme_scc.c1056
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 000000000000..19ba83635dd7
--- /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);