vme_scc.c
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上传日期:2013-02-24
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文件大小:30k
- /*
- * 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/tqueue.h>
- #include <linux/version.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 void scc_tx_int(int irq, void *data, struct pt_regs *fp);
- static void scc_rx_int(int irq, void *data, struct pt_regs *fp);
- static void scc_stat_int(int irq, void *data, struct pt_regs *fp);
- static void 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, scc_callout_driver;
- static struct tty_struct *scc_table[2] = { NULL, };
- static struct termios * scc_termios[2];
- static struct termios * scc_termios_locked[2];
- struct scc_port scc_ports[2];
- int scc_refcount;
- 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
- };
- /*----------------------------------------------------------------------------
- * vme_scc_init() and support functions
- *---------------------------------------------------------------------------*/
- static int scc_init_drivers(void)
- {
- int error;
- memset(&scc_driver, 0, sizeof(scc_driver));
- scc_driver.magic = TTY_DRIVER_MAGIC;
- scc_driver.driver_name = "scc";
- scc_driver.name = "ttyS";
- scc_driver.major = TTY_MAJOR;
- scc_driver.minor_start = SCC_MINOR_BASE;
- scc_driver.num = 2;
- 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;
- scc_driver.refcount = &scc_refcount;
- scc_driver.table = scc_table;
- scc_driver.termios = scc_termios;
- scc_driver.termios_locked = scc_termios_locked;
- scc_driver.open = scc_open;
- scc_driver.close = gs_close;
- scc_driver.write = gs_write;
- scc_driver.put_char = gs_put_char;
- scc_driver.flush_chars = gs_flush_chars;
- scc_driver.write_room = gs_write_room;
- scc_driver.chars_in_buffer = gs_chars_in_buffer;
- scc_driver.flush_buffer = gs_flush_buffer;
- scc_driver.ioctl = scc_ioctl;
- scc_driver.throttle = scc_throttle;
- scc_driver.unthrottle = scc_unthrottle;
- scc_driver.set_termios = gs_set_termios;
- scc_driver.stop = gs_stop;
- scc_driver.start = gs_start;
- scc_driver.hangup = gs_hangup;
- scc_driver.break_ctl = scc_break_ctl;
- scc_callout_driver = scc_driver;
- scc_callout_driver.name = "cua";
- scc_callout_driver.major = TTYAUX_MAJOR;
- scc_callout_driver.subtype = SERIAL_TYPE_CALLOUT;
- if ((error = tty_register_driver(&scc_driver))) {
- printk(KERN_ERR "scc: Couldn't register scc driver, error = %dn",
- error);
- return 1;
- }
- if ((error = tty_register_driver(&scc_callout_driver))) {
- tty_unregister_driver(&scc_driver);
- printk(KERN_ERR "scc: Couldn't register scc callout driver, error = %dn",
- error);
- 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.callout_termios = tty_std_termios;
- port->gs.normal_termios = tty_std_termios;
- 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("SCC: MVME147 Serial Drivern");
- /* 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("SCC: MVME162 Serial Drivern");
- /* 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("SCC: BVME6000 Serial Drivern");
- /* 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
- int vme_scc_init(void)
- {
- int res = -ENODEV;
- static int called = 0;
- if (called)
- return res;
- called = 1;
- #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;
- }
- /*---------------------------------------------------------------------------
- * Interrupt handlers
- *--------------------------------------------------------------------------*/
- static void 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 ("scc_rx_int with NULL tty!n");
- SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
- return;
- }
- 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;
- }
- SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
- tty_flip_buffer_push(tty);
- }
- static void 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 ("scc_spcond_int with NULL tty!n");
- SCCwrite(COMMAND_REG, CR_ERROR_RESET);
- SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
- return;
- }
- 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);
- }
- static void 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 ("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;
- }
- 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) {
- if ((port->gs.tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
- port->gs.tty->ldisc.write_wakeup)
- (port->gs.tty->ldisc.write_wakeup)(port->gs.tty);
- wake_up_interruptible(&port->gs.tty->write_wait);
- }
- SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
- }
- static void 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) {
- if (~(port->gs.flags & ASYNC_NORMAL_ACTIVE) ||
- ~(port->gs.flags & ASYNC_CALLOUT_ACTIVE)) {
- /* Are we blocking in open?*/
- wake_up_interruptible(&port->gs.open_wait);
- }
- }
- else {
- if (!((port->gs.flags & ASYNC_CALLOUT_ACTIVE) &&
- (port->gs.flags & ASYNC_CALLOUT_NOHUP))) {
- if (port->gs.tty)
- tty_hangup (port->gs.tty);
- }
- }
- }
- SCCwrite(COMMAND_REG, CR_EXTSTAT_RESET);
- SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
- }
- /*---------------------------------------------------------------------------
- * 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);
- save_flags(flags);
- cli();
- SCCmod(INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
- port->gs.flags &= ~GS_TX_INTEN;
- restore_flags(flags);
- }
- static void scc_enable_tx_interrupts(void *ptr)
- {
- struct scc_port *port = ptr;
- unsigned long flags;
- SCC_ACCESS_INIT(port);
- save_flags(flags);
- cli();
- SCCmod(INT_AND_DMA_REG, 0xff, IDR_TX_INT_ENAB);
- /* restart the transmitter */
- scc_tx_int (0, port, 0);
- restore_flags(flags);
- }
- static void scc_disable_rx_interrupts(void *ptr)
- {
- struct scc_port *port = ptr;
- unsigned long flags;
- SCC_ACCESS_INIT(port);
- save_flags(flags);
- cli();
- SCCmod(INT_AND_DMA_REG,
- ~(IDR_RX_INT_MASK|IDR_PARERR_AS_SPCOND|IDR_EXTSTAT_INT_ENAB), 0);
- restore_flags(flags);
- }
- static void scc_enable_rx_interrupts(void *ptr)
- {
- struct scc_port *port = ptr;
- unsigned long flags;
- SCC_ACCESS_INIT(port);
- save_flags(flags);
- cli();
- SCCmod(INT_AND_DMA_REG, 0xff,
- IDR_EXTSTAT_INT_ENAB|IDR_PARERR_AS_SPCOND|IDR_RX_INT_ALL);
- restore_flags(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 */
- save_flags(flags);
- cli();
- SCCmod(TX_CTRL_REG, ~TCR_DTR, 0);
- restore_flags(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("SCC: Bad speed requested, %dn", 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;
- else
- #endif
- #ifdef CONFIG_MVME162_SCC
- if (MACH_IS_MVME16x)
- brgval = (MVME_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
- else
- #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: */
- save_flags(flags);
- cli();
- /* 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);
- restore_flags(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;
- }
- static void scc_hungup(void *ptr)
- {
- scc_disable_tx_interrupts(ptr);
- scc_disable_rx_interrupts(ptr);
- MOD_DEC_USE_COUNT;
- }
- 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);
- save_flags(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);
- restore_flags(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 = MINOR(tty->device) - SCC_MINOR_BASE;
- 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)) {
- save_flags(flags);
- cli();
- #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);
- restore_flags(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;
- if (port->gs.count == 1) {
- MOD_INC_USE_COUNT;
- }
- retval = block_til_ready(port, filp);
- if (retval) {
- MOD_DEC_USE_COUNT;
- port->gs.count--;
- return retval;
- }
- if ((port->gs.count == 1) && (port->gs.flags & ASYNC_SPLIT_TERMIOS)) {
- if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
- *tty->termios = port->gs.normal_termios;
- else
- *tty->termios = port->gs.callout_termios;
- scc_set_real_termios (port);
- }
- port->gs.session = current->session;
- port->gs.pgrp = current->pgrp;
- 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) {
- save_flags(flags);
- cli();
- SCCmod(TX_CTRL_REG, ~TCR_RTS, 0);
- restore_flags(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) {
- save_flags(flags);
- cli();
- SCCmod(TX_CTRL_REG, 0xff, TCR_RTS);
- restore_flags(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);
- save_flags(flags);
- cli();
- SCCmod(TX_CTRL_REG, ~TCR_SEND_BREAK,
- break_state ? TCR_SEND_BREAK : 0);
- restore_flags(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;
- save_flags(flags);
- cli();
- while (count--)
- {
- if (*str == 'n')
- scc_ch_write ('r');
- scc_ch_write (*str++);
- }
- restore_flags(flags);
- }
- static int scc_console_wait_key(struct console *co)
- {
- unsigned long flags;
- volatile char *p = NULL;
- int c;
-
- #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
- save_flags(flags);
- cli();
- /* wait for rx buf filled */
- while ((*p & 0x01) == 0)
- ;
- *p = 8;
- scc_delay();
- c = *p;
- restore_flags(flags);
- return c;
- }
- static kdev_t scc_console_device(struct console *c)
- {
- return MKDEV(TTY_MAJOR, SCC_MINOR_BASE + c->index);
- }
- 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,
- wait_key: scc_console_wait_key,
- setup: scc_console_setup,
- flags: CON_PRINTBUFFER,
- index: -1,
- };
- void __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);
- }