+++ /dev/null
-/*
- * 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/kdev_t.h>
-#include <asm/io.h>
-#include <linux/kernel.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/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_carrier_raised(struct tty_port *port);
-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,
- 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);
-static irqreturn_t scc_rx_int(int irq, void *data);
-static irqreturn_t scc_stat_int(int irq, void *data);
-static irqreturn_t scc_spcond_int(int irq, void *data);
-static void scc_setsignals(struct scc_port *port, int dtr, int rts);
-static int scc_break_ctl(struct tty_struct *tty, int break_state);
-
-static struct tty_driver *scc_driver;
-
-static struct scc_port scc_ports[2];
-
-/*---------------------------------------------------------------------------
- * 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_shutdown_port,
- scc_set_real_termios,
- scc_chars_in_buffer,
- scc_close,
- scc_hungup,
- NULL
-};
-
-
-static const 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,
-};
-
-static const struct tty_port_operations scc_port_ops = {
- .carrier_raised = scc_carrier_raised,
-};
-
-/*----------------------------------------------------------------------------
- * vme_scc_init() and support functions
- *---------------------------------------------------------------------------*/
-
-static int __init 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->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->init_termios.c_ispeed = 9600;
- scc_driver->init_termios.c_ospeed = 9600;
- 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 __init scc_init_portstructs(void)
-{
- struct scc_port *port;
- int i;
-
- for (i = 0; i < 2; i++) {
- port = scc_ports + i;
- tty_port_init(&port->gs.port);
- port->gs.port.ops = &scc_port_ops;
- 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_mutex = MUTEX;
-#endif
- init_waitqueue_head(&port->gs.port.open_wait);
- init_waitqueue_head(&port->gs.port.close_wait);
- }
-}
-
-
-#ifdef CONFIG_MVME147_SCC
-static int __init mvme147_scc_init(void)
-{
- struct scc_port *port;
- int error;
-
- 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];
- error = request_irq(MVME147_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
- "SCC-A TX", port);
- if (error)
- goto fail;
- error = request_irq(MVME147_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
- "SCC-A status", port);
- if (error)
- goto fail_free_a_tx;
- error = request_irq(MVME147_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
- "SCC-A RX", port);
- if (error)
- goto fail_free_a_stat;
- error = request_irq(MVME147_IRQ_SCCA_SPCOND, scc_spcond_int,
- IRQF_DISABLED, "SCC-A special cond", port);
- if (error)
- goto fail_free_a_rx;
-
- {
- 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];
- error = request_irq(MVME147_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
- "SCC-B TX", port);
- if (error)
- goto fail_free_a_spcond;
- error = request_irq(MVME147_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
- "SCC-B status", port);
- if (error)
- goto fail_free_b_tx;
- error = request_irq(MVME147_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
- "SCC-B RX", port);
- if (error)
- goto fail_free_b_stat;
- error = request_irq(MVME147_IRQ_SCCB_SPCOND, scc_spcond_int,
- IRQF_DISABLED, "SCC-B special cond", port);
- if (error)
- goto fail_free_b_rx;
-
- {
- 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;
-
-fail_free_b_rx:
- free_irq(MVME147_IRQ_SCCB_RX, port);
-fail_free_b_stat:
- free_irq(MVME147_IRQ_SCCB_STAT, port);
-fail_free_b_tx:
- free_irq(MVME147_IRQ_SCCB_TX, port);
-fail_free_a_spcond:
- free_irq(MVME147_IRQ_SCCA_SPCOND, port);
-fail_free_a_rx:
- free_irq(MVME147_IRQ_SCCA_RX, port);
-fail_free_a_stat:
- free_irq(MVME147_IRQ_SCCA_STAT, port);
-fail_free_a_tx:
- free_irq(MVME147_IRQ_SCCA_TX, port);
-fail:
- return error;
-}
-#endif
-
-
-#ifdef CONFIG_MVME162_SCC
-static int __init mvme162_scc_init(void)
-{
- struct scc_port *port;
- int error;
-
- 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];
- error = request_irq(MVME162_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
- "SCC-A TX", port);
- if (error)
- goto fail;
- error = request_irq(MVME162_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
- "SCC-A status", port);
- if (error)
- goto fail_free_a_tx;
- error = request_irq(MVME162_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
- "SCC-A RX", port);
- if (error)
- goto fail_free_a_stat;
- error = request_irq(MVME162_IRQ_SCCA_SPCOND, scc_spcond_int,
- IRQF_DISABLED, "SCC-A special cond", port);
- if (error)
- goto fail_free_a_rx;
-
- {
- 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];
- error = request_irq(MVME162_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
- "SCC-B TX", port);
- if (error)
- goto fail_free_a_spcond;
- error = request_irq(MVME162_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
- "SCC-B status", port);
- if (error)
- goto fail_free_b_tx;
- error = request_irq(MVME162_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
- "SCC-B RX", port);
- if (error)
- goto fail_free_b_stat;
- error = request_irq(MVME162_IRQ_SCCB_SPCOND, scc_spcond_int,
- IRQF_DISABLED, "SCC-B special cond", port);
- if (error)
- goto fail_free_b_rx;
-
- {
- 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;
-
-fail_free_b_rx:
- free_irq(MVME162_IRQ_SCCB_RX, port);
-fail_free_b_stat:
- free_irq(MVME162_IRQ_SCCB_STAT, port);
-fail_free_b_tx:
- free_irq(MVME162_IRQ_SCCB_TX, port);
-fail_free_a_spcond:
- free_irq(MVME162_IRQ_SCCA_SPCOND, port);
-fail_free_a_rx:
- free_irq(MVME162_IRQ_SCCA_RX, port);
-fail_free_a_stat:
- free_irq(MVME162_IRQ_SCCA_STAT, port);
-fail_free_a_tx:
- free_irq(MVME162_IRQ_SCCA_TX, port);
-fail:
- return error;
-}
-#endif
-
-
-#ifdef CONFIG_BVME6000_SCC
-static int __init bvme6000_scc_init(void)
-{
- struct scc_port *port;
- int error;
-
- 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];
- error = request_irq(BVME_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
- "SCC-A TX", port);
- if (error)
- goto fail;
- error = request_irq(BVME_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
- "SCC-A status", port);
- if (error)
- goto fail_free_a_tx;
- error = request_irq(BVME_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
- "SCC-A RX", port);
- if (error)
- goto fail_free_a_stat;
- error = request_irq(BVME_IRQ_SCCA_SPCOND, scc_spcond_int,
- IRQF_DISABLED, "SCC-A special cond", port);
- if (error)
- goto fail_free_a_rx;
-
- {
- 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];
- error = request_irq(BVME_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
- "SCC-B TX", port);
- if (error)
- goto fail_free_a_spcond;
- error = request_irq(BVME_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
- "SCC-B status", port);
- if (error)
- goto fail_free_b_tx;
- error = request_irq(BVME_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
- "SCC-B RX", port);
- if (error)
- goto fail_free_b_stat;
- error = request_irq(BVME_IRQ_SCCB_SPCOND, scc_spcond_int,
- IRQF_DISABLED, "SCC-B special cond", port);
- if (error)
- goto fail_free_b_rx;
-
- {
- 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;
-
-fail:
- free_irq(BVME_IRQ_SCCA_STAT, port);
-fail_free_a_tx:
- free_irq(BVME_IRQ_SCCA_RX, port);
-fail_free_a_stat:
- free_irq(BVME_IRQ_SCCA_SPCOND, port);
-fail_free_a_rx:
- free_irq(BVME_IRQ_SCCB_TX, port);
-fail_free_a_spcond:
- free_irq(BVME_IRQ_SCCB_STAT, port);
-fail_free_b_tx:
- free_irq(BVME_IRQ_SCCB_RX, port);
-fail_free_b_stat:
- free_irq(BVME_IRQ_SCCB_SPCOND, port);
-fail_free_b_rx:
- return error;
-}
-#endif
-
-
-static int __init 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)
-{
- unsigned char ch;
- struct scc_port *port = data;
- struct tty_struct *tty = port->gs.port.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;
- }
- tty_insert_flip_char(tty, ch, 0);
-
- /* 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);
- 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 scc_port *port = data;
- struct tty_struct *tty = port->gs.port.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;
-
- tty_insert_flip_char(tty, ch, err);
-
- /* ++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 scc_port *port = data;
- SCC_ACCESS_INIT(port);
-
- if (!port->gs.port.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.port.tty->stopped ||
- port->gs.port.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.port.tty->stopped ||
- port->gs.port.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.port.flags &= ~GS_TX_INTEN;
- }
- if (port->gs.port.tty && port->gs.xmit_cnt <= port->gs.wakeup_chars)
- tty_wakeup(port->gs.port.tty);
-
- SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
- return IRQ_HANDLED;
-}
-
-
-static irqreturn_t scc_stat_int(int irq, void *data)
-{
- 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.port.flags & ASYNC_CHECK_CD))
- ; /* Don't report DCD changes */
- else if (port->c_dcd) {
- wake_up_interruptible(&port->gs.port.open_wait);
- }
- else {
- if (port->gs.port.tty)
- tty_hangup (port->gs.port.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.port.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);
- 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_carrier_raised(struct tty_port *port)
-{
- struct scc_port *sc = container_of(port, struct scc_port, gs.port);
- unsigned channel = sc->channel;
-
- return !!(scc_last_status_reg[channel] & SR_DCD);
-}
-
-
-static void scc_shutdown_port(void *ptr)
-{
- struct scc_port *port = ptr;
-
- port->gs.port.flags &= ~ GS_ACTIVE;
- if (port->gs.port.tty && (port->gs.port.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.port.tty || !port->gs.port.tty->termios) return 0;
-
- channel = port->channel;
-
- if (channel == CHANNEL_A)
- return 0; /* Settings controlled by boot PROM */
-
- cflag = port->gs.port.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.port.flags &= ~ASYNC_CHECK_CD;
- else
- port->gs.port.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 = 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.port.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 < ARRAY_SIZE(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 < ARRAY_SIZE(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.port.tty = tty;
- port->gs.port.count++;
- retval = gs_init_port(&port->gs);
- if (retval) {
- port->gs.port.count--;
- return retval;
- }
- port->gs.port.flags |= GS_ACTIVE;
- retval = gs_block_til_ready(port, filp);
-
- if (retval) {
- port->gs.port.count--;
- return retval;
- }
-
- port->c_dcd = tty_port_carrier_raised(&port->gs.port);
-
- scc_enable_rx_interrupts(port);
-
- return 0;
-}
-
-
-static void scc_throttle (struct tty_struct * tty)
-{
- struct scc_port *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 = 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,
- unsigned int cmd, unsigned long arg)
-{
- return -ENOIOCTLCMD;
-}
-
-
-static int scc_break_ctl(struct tty_struct *tty, int break_state)
-{
- struct scc_port *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);
- return 0;
-}
-
-
-/*---------------------------------------------------------------------------
- * 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 struct console sercons = {
- .name = "ttyS",
- .write = scc_console_write,
- .device = scc_console_device,
- .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);
git.openpandora.org / pandora-kernel.git / blobdiff