diff options
Diffstat (limited to 'drivers/tc/zs.c')
| -rw-r--r-- | drivers/tc/zs.c | 2203 |
1 files changed, 0 insertions, 2203 deletions
diff --git a/drivers/tc/zs.c b/drivers/tc/zs.c deleted file mode 100644 index ed979f13908a..000000000000 --- a/drivers/tc/zs.c +++ /dev/null @@ -1,2203 +0,0 @@ -/* - * decserial.c: Serial port driver for IOASIC DECstations. - * - * Derived from drivers/sbus/char/sunserial.c by Paul Mackerras. - * Derived from drivers/macintosh/macserial.c by Harald Koerfgen. - * - * DECstation changes - * Copyright (C) 1998-2000 Harald Koerfgen - * Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 Maciej W. Rozycki - * - * For the rest of the code the original Copyright applies: - * Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au) - * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) - * - * - * Note: for IOASIC systems the wiring is as follows: - * - * mouse/keyboard: - * DIN-7 MJ-4 signal SCC - * 2 1 TxD <- A.TxD - * 3 4 RxD -> A.RxD - * - * EIA-232/EIA-423: - * DB-25 MMJ-6 signal SCC - * 2 2 TxD <- B.TxD - * 3 5 RxD -> B.RxD - * 4 RTS <- ~A.RTS - * 5 CTS -> ~B.CTS - * 6 6 DSR -> ~A.SYNC - * 8 CD -> ~B.DCD - * 12 DSRS(DCE) -> ~A.CTS (*) - * 15 TxC -> B.TxC - * 17 RxC -> B.RxC - * 20 1 DTR <- ~A.DTR - * 22 RI -> ~A.DCD - * 23 DSRS(DTE) <- ~B.RTS - * - * (*) EIA-232 defines the signal at this pin to be SCD, while DSRS(DCE) - * is shared with DSRS(DTE) at pin 23. - */ - -#include <linux/errno.h> -#include <linux/signal.h> -#include <linux/sched.h> -#include <linux/timer.h> -#include <linux/interrupt.h> -#include <linux/tty.h> -#include <linux/tty_flip.h> -#include <linux/major.h> -#include <linux/string.h> -#include <linux/fcntl.h> -#include <linux/mm.h> -#include <linux/kernel.h> -#include <linux/delay.h> -#include <linux/init.h> -#include <linux/ioport.h> -#include <linux/spinlock.h> -#ifdef CONFIG_SERIAL_DEC_CONSOLE -#include <linux/console.h> -#endif - -#include <asm/io.h> -#include <asm/pgtable.h> -#include <asm/irq.h> -#include <asm/system.h> -#include <asm/bootinfo.h> - -#include <asm/dec/interrupts.h> -#include <asm/dec/ioasic_addrs.h> -#include <asm/dec/machtype.h> -#include <asm/dec/serial.h> -#include <asm/dec/system.h> - -#ifdef CONFIG_KGDB -#include <asm/kgdb.h> -#endif -#ifdef CONFIG_MAGIC_SYSRQ -#include <linux/sysrq.h> -#endif - -#include "zs.h" - -/* - * It would be nice to dynamically allocate everything that - * depends on NUM_SERIAL, so we could support any number of - * Z8530s, but for now... - */ -#define NUM_SERIAL 2 /* Max number of ZS chips supported */ -#define NUM_CHANNELS (NUM_SERIAL * 2) /* 2 channels per chip */ -#define CHANNEL_A_NR (zs_parms->channel_a_offset > zs_parms->channel_b_offset) - /* Number of channel A in the chip */ -#define ZS_CHAN_IO_SIZE 8 -#define ZS_CLOCK 7372800 /* Z8530 RTxC input clock rate */ - -#define RECOVERY_DELAY udelay(2) - -struct zs_parms { - unsigned long scc0; - unsigned long scc1; - int channel_a_offset; - int channel_b_offset; - int irq0; - int irq1; - int clock; -}; - -static struct zs_parms *zs_parms; - -#ifdef CONFIG_MACH_DECSTATION -static struct zs_parms ds_parms = { - scc0 : IOASIC_SCC0, - scc1 : IOASIC_SCC1, - channel_a_offset : 1, - channel_b_offset : 9, - irq0 : -1, - irq1 : -1, - clock : ZS_CLOCK -}; -#endif - -#ifdef CONFIG_MACH_DECSTATION -#define DS_BUS_PRESENT (IOASIC) -#else -#define DS_BUS_PRESENT 0 -#endif - -#define BUS_PRESENT (DS_BUS_PRESENT) - -DEFINE_SPINLOCK(zs_lock); - -struct dec_zschannel zs_channels[NUM_CHANNELS]; -struct dec_serial zs_soft[NUM_CHANNELS]; -int zs_channels_found; -struct dec_serial *zs_chain; /* list of all channels */ - -struct tty_struct zs_ttys[NUM_CHANNELS]; - -#ifdef CONFIG_SERIAL_DEC_CONSOLE -static struct console zs_console; -#endif -#if defined(CONFIG_SERIAL_DEC_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) && \ - !defined(MODULE) -static unsigned long break_pressed; /* break, really ... */ -#endif - -static unsigned char zs_init_regs[16] __initdata = { - 0, /* write 0 */ - 0, /* write 1 */ - 0, /* write 2 */ - 0, /* write 3 */ - (X16CLK), /* write 4 */ - 0, /* write 5 */ - 0, 0, 0, /* write 6, 7, 8 */ - (MIE | DLC | NV), /* write 9 */ - (NRZ), /* write 10 */ - (TCBR | RCBR), /* write 11 */ - 0, 0, /* BRG time constant, write 12 + 13 */ - (BRSRC | BRENABL), /* write 14 */ - 0 /* write 15 */ -}; - -static struct tty_driver *serial_driver; - -/* serial subtype definitions */ -#define SERIAL_TYPE_NORMAL 1 - -/* number of characters left in xmit buffer before we ask for more */ -#define WAKEUP_CHARS 256 - -/* - * Debugging. - */ -#undef SERIAL_DEBUG_OPEN -#undef SERIAL_DEBUG_FLOW -#undef SERIAL_DEBUG_THROTTLE -#undef SERIAL_PARANOIA_CHECK - -#undef ZS_DEBUG_REGS - -#ifdef SERIAL_DEBUG_THROTTLE -#define _tty_name(tty,buf) tty_name(tty,buf) -#endif - -#define RS_STROBE_TIME 10 -#define RS_ISR_PASS_LIMIT 256 - -static void probe_sccs(void); -static void change_speed(struct dec_serial *info); -static void rs_wait_until_sent(struct tty_struct *tty, int timeout); - -static inline int serial_paranoia_check(struct dec_serial *info, - char *name, const char *routine) -{ -#ifdef SERIAL_PARANOIA_CHECK - static const char *badmagic = - "Warning: bad magic number for serial struct %s in %s\n"; - static const char *badinfo = - "Warning: null mac_serial for %s in %s\n"; - - if (!info) { - printk(badinfo, name, routine); - return 1; - } - if (info->magic != SERIAL_MAGIC) { - printk(badmagic, name, routine); - return 1; - } -#endif - return 0; -} - -/* - * This is used to figure out the divisor speeds and the timeouts - */ -static int baud_table[] = { - 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, - 9600, 19200, 38400, 57600, 115200, 0 }; - -/* - * Reading and writing Z8530 registers. - */ -static inline unsigned char read_zsreg(struct dec_zschannel *channel, - unsigned char reg) -{ - unsigned char retval; - - if (reg != 0) { - *channel->control = reg & 0xf; - fast_iob(); RECOVERY_DELAY; - } - retval = *channel->control; - RECOVERY_DELAY; - return retval; -} - -static inline void write_zsreg(struct dec_zschannel *channel, - unsigned char reg, unsigned char value) -{ - if (reg != 0) { - *channel->control = reg & 0xf; - fast_iob(); RECOVERY_DELAY; - } - *channel->control = value; - fast_iob(); RECOVERY_DELAY; - return; -} - -static inline unsigned char read_zsdata(struct dec_zschannel *channel) -{ - unsigned char retval; - - retval = *channel->data; - RECOVERY_DELAY; - return retval; -} - -static inline void write_zsdata(struct dec_zschannel *channel, - unsigned char value) -{ - *channel->data = value; - fast_iob(); RECOVERY_DELAY; - return; -} - -static inline void load_zsregs(struct dec_zschannel *channel, - unsigned char *regs) -{ -/* ZS_CLEARERR(channel); - ZS_CLEARFIFO(channel); */ - /* Load 'em up */ - write_zsreg(channel, R3, regs[R3] & ~RxENABLE); - write_zsreg(channel, R5, regs[R5] & ~TxENAB); - write_zsreg(channel, R4, regs[R4]); - write_zsreg(channel, R9, regs[R9]); - write_zsreg(channel, R1, regs[R1]); - write_zsreg(channel, R2, regs[R2]); - write_zsreg(channel, R10, regs[R10]); - write_zsreg(channel, R11, regs[R11]); - write_zsreg(channel, R12, regs[R12]); - write_zsreg(channel, R13, regs[R13]); - write_zsreg(channel, R14, regs[R14]); - write_zsreg(channel, R15, regs[R15]); - write_zsreg(channel, R3, regs[R3]); - write_zsreg(channel, R5, regs[R5]); - return; -} - -/* Sets or clears DTR/RTS on the requested line */ -static inline void zs_rtsdtr(struct dec_serial *info, int which, int set) -{ - unsigned long flags; - - spin_lock_irqsave(&zs_lock, flags); - if (info->zs_channel != info->zs_chan_a) { - if (set) { - info->zs_chan_a->curregs[5] |= (which & (RTS | DTR)); - } else { - info->zs_chan_a->curregs[5] &= ~(which & (RTS | DTR)); - } - write_zsreg(info->zs_chan_a, 5, info->zs_chan_a->curregs[5]); - } - spin_unlock_irqrestore(&zs_lock, flags); -} - -/* Utility routines for the Zilog */ -static inline int get_zsbaud(struct dec_serial *ss) -{ - struct dec_zschannel *channel = ss->zs_channel; - int brg; - - /* The baud rate is split up between two 8-bit registers in - * what is termed 'BRG time constant' format in my docs for - * the chip, it is a function of the clk rate the chip is - * receiving which happens to be constant. - */ - brg = (read_zsreg(channel, 13) << 8); - brg |= read_zsreg(channel, 12); - return BRG_TO_BPS(brg, (zs_parms->clock/(ss->clk_divisor))); -} - -/* On receive, this clears errors and the receiver interrupts */ -static inline void rs_recv_clear(struct dec_zschannel *zsc) -{ - write_zsreg(zsc, 0, ERR_RES); - write_zsreg(zsc, 0, RES_H_IUS); /* XXX this is unnecessary */ -} - -/* - * ---------------------------------------------------------------------- - * - * Here starts the interrupt handling routines. All of the following - * subroutines are declared as inline and are folded into - * rs_interrupt(). They were separated out for readability's sake. - * - * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 - * ----------------------------------------------------------------------- - */ - -/* - * This routine is used by the interrupt handler to schedule - * processing in the software interrupt portion of the driver. - */ -static void rs_sched_event(struct dec_serial *info, int event) -{ - info->event |= 1 << event; - tasklet_schedule(&info->tlet); -} - -static void receive_chars(struct dec_serial *info) -{ - struct tty_struct *tty = info->tty; - unsigned char ch, stat, flag; - - while ((read_zsreg(info->zs_channel, R0) & Rx_CH_AV) != 0) { - - stat = read_zsreg(info->zs_channel, R1); - ch = read_zsdata(info->zs_channel); - - if (!tty && (!info->hook || !info->hook->rx_char)) - continue; - - flag = TTY_NORMAL; - if (info->tty_break) { - info->tty_break = 0; - flag = TTY_BREAK; - if (info->flags & ZILOG_SAK) - do_SAK(tty); - /* Ignore the null char got when BREAK is removed. */ - if (ch == 0) - continue; - } else { - if (stat & Rx_OVR) { - flag = TTY_OVERRUN; - } else if (stat & FRM_ERR) { - flag = TTY_FRAME; - } else if (stat & PAR_ERR) { - flag = TTY_PARITY; - } - if (flag != TTY_NORMAL) - /* reset the error indication */ - write_zsreg(info->zs_channel, R0, ERR_RES); - } - -#if defined(CONFIG_SERIAL_DEC_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) && \ - !defined(MODULE) - if (break_pressed && info->line == zs_console.index) { - /* Ignore the null char got when BREAK is removed. */ - if (ch == 0) - continue; - if (time_before(jiffies, break_pressed + HZ * 5)) { - handle_sysrq(ch, NULL); - break_pressed = 0; - continue; - } - break_pressed = 0; - } -#endif - - if (info->hook && info->hook->rx_char) { - (*info->hook->rx_char)(ch, flag); - return; - } - - tty_insert_flip_char(tty, ch, flag); - } - if (tty) - tty_flip_buffer_push(tty); -} - -static void transmit_chars(struct dec_serial *info) -{ - if ((read_zsreg(info->zs_channel, R0) & Tx_BUF_EMP) == 0) - return; - info->tx_active = 0; - - if (info->x_char) { - /* Send next char */ - write_zsdata(info->zs_channel, info->x_char); - info->x_char = 0; - info->tx_active = 1; - return; - } - - if ((info->xmit_cnt <= 0) || (info->tty && info->tty->stopped) - || info->tx_stopped) { - write_zsreg(info->zs_channel, R0, RES_Tx_P); - return; - } - /* Send char */ - write_zsdata(info->zs_channel, info->xmit_buf[info->xmit_tail++]); - info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); - info->xmit_cnt--; - info->tx_active = 1; - - if (info->xmit_cnt < WAKEUP_CHARS) - rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); -} - -static void status_handle(struct dec_serial *info) -{ - unsigned char stat; - - /* Get status from Read Register 0 */ - stat = read_zsreg(info->zs_channel, R0); - - if ((stat & BRK_ABRT) && !(info->read_reg_zero & BRK_ABRT)) { -#if defined(CONFIG_SERIAL_DEC_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) && \ - !defined(MODULE) - if (info->line == zs_console.index) { - if (!break_pressed) - break_pressed = jiffies; - } else -#endif - info->tty_break = 1; - } - - if (info->zs_channel != info->zs_chan_a) { - - /* Check for DCD transitions */ - if (info->tty && !C_CLOCAL(info->tty) && - ((stat ^ info->read_reg_zero) & DCD) != 0 ) { - if (stat & DCD) { - wake_up_interruptible(&info->open_wait); - } else { - tty_hangup(info->tty); - } - } - - /* Check for CTS transitions */ - if (info->tty && C_CRTSCTS(info->tty)) { - if ((stat & CTS) != 0) { - if (info->tx_stopped) { - info->tx_stopped = 0; - if (!info->tx_active) - transmit_chars(info); - } - } else { - info->tx_stopped = 1; - } - } - - } - - /* Clear status condition... */ - write_zsreg(info->zs_channel, R0, RES_EXT_INT); - info->read_reg_zero = stat; -} - -/* - * This is the serial driver's generic interrupt routine - */ -static irqreturn_t rs_interrupt(int irq, void *dev_id) -{ - struct dec_serial *info = (struct dec_serial *) dev_id; - irqreturn_t status = IRQ_NONE; - unsigned char zs_intreg; - int shift; - - /* NOTE: The read register 3, which holds the irq status, - * does so for both channels on each chip. Although - * the status value itself must be read from the A - * channel and is only valid when read from channel A. - * Yes... broken hardware... - */ -#define CHAN_IRQMASK (CHBRxIP | CHBTxIP | CHBEXT) - - if (info->zs_chan_a == info->zs_channel) - shift = 3; /* Channel A */ - else - shift = 0; /* Channel B */ - - for (;;) { - zs_intreg = read_zsreg(info->zs_chan_a, R3) >> shift; - if ((zs_intreg & CHAN_IRQMASK) == 0) - break; - - status = IRQ_HANDLED; - - if (zs_intreg & CHBRxIP) { - receive_chars(info); - } - if (zs_intreg & CHBTxIP) { - transmit_chars(info); - } - if (zs_intreg & CHBEXT) { - status_handle(info); - } - } - - /* Why do we need this ? */ - write_zsreg(info->zs_channel, 0, RES_H_IUS); - - return status; -} - -#ifdef ZS_DEBUG_REGS -void zs_dump (void) { - int i, j; - for (i = 0; i < zs_channels_found; i++) { - struct dec_zschannel *ch = &zs_channels[i]; - if ((long)ch->control == UNI_IO_BASE+UNI_SCC1A_CTRL) { - for (j = 0; j < 15; j++) { - printk("W%d = 0x%x\t", - j, (int)ch->curregs[j]); - } - for (j = 0; j < 15; j++) { - printk("R%d = 0x%x\t", - j, (int)read_zsreg(ch,j)); - } - printk("\n\n"); - } - } -} -#endif - -/* - * ------------------------------------------------------------------- - * Here ends the serial interrupt routines. - * ------------------------------------------------------------------- - */ - -/* - * ------------------------------------------------------------ - * rs_stop() and rs_start() - * - * This routines are called before setting or resetting tty->stopped. - * ------------------------------------------------------------ - */ -static void rs_stop(struct tty_struct *tty) -{ - struct dec_serial *info = (struct dec_serial *)tty->driver_data; - unsigned long flags; - - if (serial_paranoia_check(info, tty->name, "rs_stop")) - return; - -#if 1 - spin_lock_irqsave(&zs_lock, flags); - if (info->zs_channel->curregs[5] & TxENAB) { - info->zs_channel->curregs[5] &= ~TxENAB; - write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]); - } - spin_unlock_irqrestore(&zs_lock, flags); -#endif -} - -static void rs_start(struct tty_struct *tty) -{ - struct dec_serial *info = (struct dec_serial *)tty->driver_data; - unsigned long flags; - - if (serial_paranoia_check(info, tty->name, "rs_start")) - return; - - spin_lock_irqsave(&zs_lock, flags); -#if 1 - if (info->xmit_cnt && info->xmit_buf && !(info->zs_channel->curregs[5] & TxENAB)) { - info->zs_channel->curregs[5] |= TxENAB; - write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]); - } -#else - if (info->xmit_cnt && info->xmit_buf && !info->tx_active) { - transmit_chars(info); - } -#endif - spin_unlock_irqrestore(&zs_lock, flags); -} - -/* - * This routine is used to handle the "bottom half" processing for the - * serial driver, known also the "software interrupt" processing. - * This processing is done at the kernel interrupt level, after the - * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This - * is where time-consuming activities which can not be done in the - * interrupt driver proper are done; the interrupt driver schedules - * them using rs_sched_event(), and they get done here. - */ - -static void do_softint(unsigned long private_) -{ - struct dec_serial *info = (struct dec_serial *) private_; - struct tty_struct *tty; - - tty = info->tty; - if (!tty) - return; - - if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) - tty_wakeup(tty); -} - -static int zs_startup(struct dec_serial * info) -{ - unsigned long flags; - - if (info->flags & ZILOG_INITIALIZED) - return 0; - - if (!info->xmit_buf) { - info->xmit_buf = (unsigned char *) get_zeroed_page(GFP_KERNEL); - if (!info->xmit_buf) - return -ENOMEM; - } - - spin_lock_irqsave(&zs_lock, flags); - -#ifdef SERIAL_DEBUG_OPEN - printk("starting up ttyS%d (irq %d)...", info->line, info->irq); -#endif - - /* - * Clear the receive FIFO. - */ - ZS_CLEARFIFO(info->zs_channel); - info->xmit_fifo_size = 1; - - /* - * Clear the interrupt registers. - */ - write_zsreg(info->zs_channel, R0, ERR_RES); - write_zsreg(info->zs_channel, R0, RES_H_IUS); - - /* - * Set the speed of the serial port - */ - change_speed(info); - - /* - * Turn on RTS and DTR. - */ - zs_rtsdtr(info, RTS | DTR, 1); - - /* - * Finally, enable sequencing and interrupts - */ - info->zs_channel->curregs[R1] &= ~RxINT_MASK; - info->zs_channel->curregs[R1] |= (RxINT_ALL | TxINT_ENAB | - EXT_INT_ENAB); - info->zs_channel->curregs[R3] |= RxENABLE; - info->zs_channel->curregs[R5] |= TxENAB; - info->zs_channel->curregs[R15] |= (DCDIE | CTSIE | TxUIE | BRKIE); - write_zsreg(info->zs_channel, R1, info->zs_channel->curregs[R1]); - write_zsreg(info->zs_channel, R3, info->zs_channel->curregs[R3]); - write_zsreg(info->zs_channel, R5, info->zs_channel->curregs[R5]); - write_zsreg(info->zs_channel, R15, info->zs_channel->curregs[R15]); - - /* - * And clear the interrupt registers again for luck. - */ - write_zsreg(info->zs_channel, R0, ERR_RES); - write_zsreg(info->zs_channel, R0, RES_H_IUS); - - /* Save the current value of RR0 */ - info->read_reg_zero = read_zsreg(info->zs_channel, R0); - - if (info->tty) - clear_bit(TTY_IO_ERROR, &info->tty->flags); - info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; - - info->flags |= ZILOG_INITIALIZED; - spin_unlock_irqrestore(&zs_lock, flags); - return 0; -} - -/* - * This routine will shutdown a serial port; interrupts are disabled, and - * DTR is dropped if the hangup on close termio flag is on. - */ -static void shutdown(struct dec_serial * info) -{ - unsigned long flags; - - if (!(info->flags & ZILOG_INITIALIZED)) - return; - -#ifdef SERIAL_DEBUG_OPEN - printk("Shutting down serial port %d (irq %d)....", info->line, - info->irq); -#endif - - spin_lock_irqsave(&zs_lock, flags); - - if (info->xmit_buf) { - free_page((unsigned long) info->xmit_buf); - info->xmit_buf = 0; - } - - info->zs_channel->curregs[1] = 0; - write_zsreg(info->zs_channel, 1, info->zs_channel->curregs[1]); /* no interrupts */ - - info->zs_channel->curregs[3] &= ~RxENABLE; - write_zsreg(info->zs_channel, 3, info->zs_channel->curregs[3]); - - info->zs_channel->curregs[5] &= ~TxENAB; - write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]); - if (!info->tty || C_HUPCL(info->tty)) { - zs_rtsdtr(info, RTS | DTR, 0); - } - - if (info->tty) - set_bit(TTY_IO_ERROR, &info->tty->flags); - - info->flags &= ~ZILOG_INITIALIZED; - spin_unlock_irqrestore(&zs_lock, flags); -} - -/* - * This routine is called to set the UART divisor registers to match - * the specified baud rate for a serial port. - */ -static void change_speed(struct dec_serial *info) -{ - unsigned cflag; - int i; - int brg, bits; - unsigned long flags; - - if (!info->hook) { - if (!info->tty || !info->tty->termios) - return; - cflag = info->tty->termios->c_cflag; - if (!info->port) - return; - } else { - cflag = info->hook->cflags; - } - - i = cflag & CBAUD; - if (i & CBAUDEX) { - i &= ~CBAUDEX; - if (i < 1 || i > 2) { - if (!info->hook) - info->tty->termios->c_cflag &= ~CBAUDEX; - else - info->hook->cflags &= ~CBAUDEX; - } else - i += 15; - } - - spin_lock_irqsave(&zs_lock, flags); - info->zs_baud = baud_table[i]; - if (info->zs_baud) { - brg = BPS_TO_BRG(info->zs_baud, zs_parms->clock/info->clk_divisor); - info->zs_channel->curregs[12] = (brg & 255); - info->zs_channel->curregs[13] = ((brg >> 8) & 255); - zs_rtsdtr(info, DTR, 1); - } else { - zs_rtsdtr(info, RTS | DTR, 0); - return; - } - - /* byte size and parity */ - info->zs_channel->curregs[3] &= ~RxNBITS_MASK; - info->zs_channel->curregs[5] &= ~TxNBITS_MASK; - switch (cflag & CSIZE) { - case CS5: - bits = 7; - info->zs_channel->curregs[3] |= Rx5; - info->zs_channel->curregs[5] |= Tx5; - break; - case CS6: - bits = 8; - info->zs_channel->curregs[3] |= Rx6; - info->zs_channel->curregs[5] |= Tx6; - break; - case CS7: - bits = 9; - info->zs_channel->curregs[3] |= Rx7; - info->zs_channel->curregs[5] |= Tx7; - break; - case CS8: - default: /* defaults to 8 bits */ - bits = 10; - info->zs_channel->curregs[3] |= Rx8; - info->zs_channel->curregs[5] |= Tx8; - break; - } - - info->timeout = ((info->xmit_fifo_size*HZ*bits) / info->zs_baud); - info->timeout += HZ/50; /* Add .02 seconds of slop */ - - info->zs_channel->curregs[4] &= ~(SB_MASK | PAR_ENA | PAR_EVEN); - if (cflag & CSTOPB) { - info->zs_channel->curregs[4] |= SB2; - } else { - info->zs_channel->curregs[4] |= SB1; - } - if (cflag & PARENB) { - info->zs_channel->curregs[4] |= PAR_ENA; - } - if (!(cflag & PARODD)) { - info->zs_channel->curregs[4] |= PAR_EVEN; - } - - if (!(cflag & CLOCAL)) { - if (!(info->zs_channel->curregs[15] & DCDIE)) - info->read_reg_zero = read_zsreg(info->zs_channel, 0); - info->zs_channel->curregs[15] |= DCDIE; - } else - info->zs_channel->curregs[15] &= ~DCDIE; - if (cflag & CRTSCTS) { - info->zs_channel->curregs[15] |= CTSIE; - if ((read_zsreg(info->zs_channel, 0) & CTS) == 0) - info->tx_stopped = 1; - } else { - info->zs_channel->curregs[15] &= ~CTSIE; - info->tx_stopped = 0; - } - - /* Load up the new values */ - load_zsregs(info->zs_channel, info->zs_channel->curregs); - - spin_unlock_irqrestore(&zs_lock, flags); -} - -static void rs_flush_chars(struct tty_struct *tty) -{ - struct dec_serial *info = (struct dec_serial *)tty->driver_data; - unsigned long flags; - - if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) - return; - - if (info->xmit_cnt <= 0 || tty->stopped || info->tx_stopped || - !info->xmit_buf) - return; - - /* Enable transmitter */ - spin_lock_irqsave(&zs_lock, flags); - transmit_chars(info); - spin_unlock_irqrestore(&zs_lock, flags); -} - -static int rs_write(struct tty_struct * tty, - const unsigned char *buf, int count) -{ - int c, total = 0; - struct dec_serial *info = (struct dec_serial *)tty->driver_data; - unsigned long flags; - - if (serial_paranoia_check(info, tty->name, "rs_write")) - return 0; - - if (!tty || !info->xmit_buf) - return 0; - - while (1) { - spin_lock_irqsave(&zs_lock, flags); - c = min(count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, - SERIAL_XMIT_SIZE - info->xmit_head)); - if (c <= 0) - break; - - memcpy(info->xmit_buf + info->xmit_head, buf, c); - info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); - info->xmit_cnt += c; - spin_unlock_irqrestore(&zs_lock, flags); - buf += c; - count -= c; - total += c; - } - - if (info->xmit_cnt && !tty->stopped && !info->tx_stopped - && !info->tx_active) - transmit_chars(info); - spin_unlock_irqrestore(&zs_lock, flags); - return total; -} - -static int rs_write_room(struct tty_struct *tty) -{ - struct dec_serial *info = (struct dec_serial *)tty->driver_data; - int ret; - - if (serial_paranoia_check(info, tty->name, "rs_write_room")) - return 0; - ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; - if (ret < 0) - ret = 0; - return ret; -} - -static int rs_chars_in_buffer(struct tty_struct *tty) -{ - struct dec_serial *info = (struct dec_serial *)tty->driver_data; - - if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) - return 0; - return info->xmit_cnt; -} - -static void rs_flush_buffer(struct tty_struct *tty) -{ - struct dec_serial *info = (struct dec_serial *)tty->driver_data; - - if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) - return; - spin_lock_irq(&zs_lock); - info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; - spin_unlock_irq(&zs_lock); - tty_wakeup(tty); -} - -/* - * ------------------------------------------------------------ - * rs_throttle() - * - * This routine is called by the upper-layer tty layer to signal that - * incoming characters should be throttled. - * ------------------------------------------------------------ - */ -static void rs_throttle(struct tty_struct * tty) -{ - struct dec_serial *info = (struct dec_serial *)tty->driver_data; - unsigned long flags; - -#ifdef SERIAL_DEBUG_THROTTLE - char buf[64]; - - printk("throttle %s: %d....\n", _tty_name(tty, buf), - tty->ldisc.chars_in_buffer(tty)); -#endif - - if (serial_paranoia_check(info, tty->name, "rs_throttle")) - return; - - if (I_IXOFF(tty)) { - spin_lock_irqsave(&zs_lock, flags); - info->x_char = STOP_CHAR(tty); - if (!info->tx_active) - transmit_chars(info); - spin_unlock_irqrestore(&zs_lock, flags); - } - - if (C_CRTSCTS(tty)) { - zs_rtsdtr(info, RTS, 0); - } -} - -static void rs_unthrottle(struct tty_struct * tty) -{ - struct dec_serial *info = (struct dec_serial *)tty->driver_data; - unsigned long flags; - -#ifdef SERIAL_DEBUG_THROTTLE - char buf[64]; - - printk("unthrottle %s: %d....\n", _tty_name(tty, buf), - tty->ldisc.chars_in_buffer(tty)); -#endif - - if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) - return; - - if (I_IXOFF(tty)) { - spin_lock_irqsave(&zs_lock, flags); - if (info->x_char) - info->x_char = 0; - else { - info->x_char = START_CHAR(tty); - if (!info->tx_active) - transmit_chars(info); - } - spin_unlock_irqrestore(&zs_lock, flags); - } - - if (C_CRTSCTS(tty)) { - zs_rtsdtr(info, RTS, 1); - } -} - -/* - * ------------------------------------------------------------ - * rs_ioctl() and friends - * ------------------------------------------------------------ - */ - -static int get_serial_info(struct dec_serial * info, - struct serial_struct * retinfo) -{ - struct serial_struct tmp; - - if (!retinfo) - return -EFAULT; - memset(&tmp, 0, sizeof(tmp)); - tmp.type = info->type; - tmp.line = info->line; - tmp.port = info->port; - tmp.irq = info->irq; - tmp.flags = info->flags; - tmp.baud_base = info->baud_base; - tmp.close_delay = info->close_delay; - tmp.closing_wait = info->closing_wait; - tmp.custom_divisor = info->custom_divisor; - return copy_to_user(retinfo,&tmp,sizeof(*retinfo)) ? -EFAULT : 0; -} - -static int set_serial_info(struct dec_serial * info, - struct serial_struct * new_info) -{ - struct serial_struct new_serial; - struct dec_serial old_info; - int retval = 0; - - if (!new_info) - return -EFAULT; - copy_from_user(&new_serial,new_info,sizeof(new_serial)); - old_info = *info; - - if (!capable(CAP_SYS_ADMIN)) { - if ((new_serial.baud_base != info->baud_base) || - (new_serial.type != info->type) || - (new_serial.close_delay != info->close_delay) || - ((new_serial.flags & ~ZILOG_USR_MASK) != - (info->flags & ~ZILOG_USR_MASK))) - return -EPERM; - info->flags = ((info->flags & ~ZILOG_USR_MASK) | - (new_serial.flags & ZILOG_USR_MASK)); - info->custom_divisor = new_serial.custom_divisor; - goto check_and_exit; - } - - if (info->count > 1) - return -EBUSY; - - /* - * OK, past this point, all the error checking has been done. - * At this point, we start making changes..... - */ - - info->baud_base = new_serial.baud_base; - info->flags = ((info->flags & ~ZILOG_FLAGS) | - (new_serial.flags & ZILOG_FLAGS)); - info->type = new_serial.type; - info->close_delay = new_serial.close_delay; - info->closing_wait = new_serial.closing_wait; - -check_and_exit: - retval = zs_startup(info); - return retval; -} - -/* - * get_lsr_info - get line status register info - * - * Purpose: Let user call ioctl() to get info when the UART physically - * is emptied. On bus types like RS485, the transmitter must - * release the bus after transmitting. This must be done when - * the transmit shift register is empty, not be done when the - * transmit holding register is empty. This functionality - * allows an RS485 driver to be written in user space. - */ -static int get_lsr_info(struct dec_serial * info, unsigned int *value) -{ - unsigned char status; - - spin_lock(&zs_lock); - status = read_zsreg(info->zs_channel, 0); - spin_unlock_irq(&zs_lock); - put_user(status,value); - return 0; -} - -static int rs_tiocmget(struct tty_struct *tty, struct file *file) -{ - struct dec_serial * info = (struct dec_serial *)tty->driver_data; - unsigned char control, status_a, status_b; - unsigned int result; - - if (info->hook) - return -ENODEV; - - if (serial_paranoia_check(info, tty->name, __FUNCTION__)) - return -ENODEV; - - if (tty->flags & (1 << TTY_IO_ERROR)) - return -EIO; - - if (info->zs_channel == info->zs_chan_a) - result = 0; - else { - spin_lock(&zs_lock); - control = info->zs_chan_a->curregs[5]; - status_a = read_zsreg(info->zs_chan_a, 0); - status_b = read_zsreg(info->zs_channel, 0); - spin_unlock_irq(&zs_lock); - result = ((control & RTS) ? TIOCM_RTS: 0) - | ((control & DTR) ? TIOCM_DTR: 0) - | ((status_b & DCD) ? TIOCM_CAR: 0) - | ((status_a & DCD) ? TIOCM_RNG: 0) - | ((status_a & SYNC_HUNT) ? TIOCM_DSR: 0) - | ((status_b & CTS) ? TIOCM_CTS: 0); - } - return result; -} - -static int rs_tiocmset(struct tty_struct *tty, struct file *file, - unsigned int set, unsigned int clear) -{ - struct dec_serial * info = (struct dec_serial *)tty->driver_data; - - if (info->hook) - return -ENODEV; - - if (serial_paranoia_check(info, tty->name, __FUNCTION__)) - return -ENODEV; - - if (tty->flags & (1 << TTY_IO_ERROR)) - return -EIO; - - if (info->zs_channel == info->zs_chan_a) - return 0; - - spin_lock(&zs_lock); - if (set & TIOCM_RTS) - info->zs_chan_a->curregs[5] |= RTS; - if (set & TIOCM_DTR) - info->zs_chan_a->curregs[5] |= DTR; - if (clear & TIOCM_RTS) - info->zs_chan_a->curregs[5] &= ~RTS; - if (clear & TIOCM_DTR) - info->zs_chan_a->curregs[5] &= ~DTR; - write_zsreg(info->zs_chan_a, 5, info->zs_chan_a->curregs[5]); - spin_unlock_irq(&zs_lock); - return 0; -} - -/* - * rs_break - turn transmit break condition on/off - */ -static void rs_break(struct tty_struct *tty, int break_state) -{ - struct dec_serial *info = (struct dec_serial *) tty->driver_data; - unsigned long flags; - - if (serial_paranoia_check(info, tty->name, "rs_break")) - return; - if (!info->port) - return; - - spin_lock_irqsave(&zs_lock, flags); - if (break_state == -1) - info->zs_channel->curregs[5] |= SND_BRK; - else - info->zs_channel->curregs[5] &= ~SND_BRK; - write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]); - spin_unlock_irqrestore(&zs_lock, flags); -} - -static int rs_ioctl(struct tty_struct *tty, struct file * file, - unsigned int cmd, unsigned long arg) -{ - struct dec_serial * info = (struct dec_serial *)tty->driver_data; - - if (info->hook) - return -ENODEV; - - if (serial_paranoia_check(info, tty->name, "rs_ioctl")) - return -ENODEV; - - if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && - (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && - (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { - if (tty->flags & (1 << TTY_IO_ERROR)) - return -EIO; - } - - switch (cmd) { - case TIOCGSERIAL: - if (!access_ok(VERIFY_WRITE, (void *)arg, - sizeof(struct serial_struct))) - return -EFAULT; - return get_serial_info(info, (struct serial_struct *)arg); - - case TIOCSSERIAL: - return set_serial_info(info, (struct serial_struct *)arg); - - case TIOCSERGETLSR: /* Get line status register */ - if (!access_ok(VERIFY_WRITE, (void *)arg, - sizeof(unsigned int))) - return -EFAULT; - return get_lsr_info(info, (unsigned int *)arg); - - case TIOCSERGSTRUCT: - if (!access_ok(VERIFY_WRITE, (void *)arg, - sizeof(struct dec_serial))) - return -EFAULT; - copy_from_user((struct dec_serial *)arg, info, - sizeof(struct dec_serial)); - return 0; - - default: - return -ENOIOCTLCMD; - } - return 0; -} - -static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) -{ - struct dec_serial *info = (struct dec_serial *)tty->driver_data; - int was_stopped; - - if (tty->termios->c_cflag == old_termios->c_cflag) - return; - was_stopped = info->tx_stopped; - - change_speed(info); - - if (was_stopped && !info->tx_stopped) - rs_start(tty); -} - -/* - * ------------------------------------------------------------ - * rs_close() - * - * This routine is called when the serial port gets closed. - * Wait for the last remaining data to be sent. - * ------------------------------------------------------------ - */ -static void rs_close(struct tty_struct *tty, struct file * filp) -{ - struct dec_serial * info = (struct dec_serial *)tty->driver_data; - unsigned long flags; - - if (!info || serial_paranoia_check(info, tty->name, "rs_close")) - return; - - spin_lock_irqsave(&zs_lock, flags); - - if (tty_hung_up_p(filp)) { - spin_unlock_irqrestore(&zs_lock, flags); - return; - } - -#ifdef SERIAL_DEBUG_OPEN - printk("rs_close ttyS%d, count = %d\n", info->line, info->count); -#endif - if ((tty->count == 1) && (info->count != 1)) { - /* - * Uh, oh. tty->count is 1, which means that the tty - * structure will be freed. Info->count should always - * be one in these conditions. If it's greater than - * one, we've got real problems, since it means the - * serial port won't be shutdown. - */ - printk("rs_close: bad serial port count; tty->count is 1, " - "info->count is %d\n", info->count); - info->count = 1; - } - if (--info->count < 0) { - printk("rs_close: bad serial port count for ttyS%d: %d\n", - info->line, info->count); - info->count = 0; - } - if (info->count) { - spin_unlock_irqrestore(&zs_lock, flags); - return; - } - info->flags |= ZILOG_CLOSING; - /* - * Now we wait for the transmit buffer to clear; and we notify - * the line discipline to only process XON/XOFF characters. - */ - tty->closing = 1; - if (info->closing_wait != ZILOG_CLOSING_WAIT_NONE) - tty_wait_until_sent(tty, info->closing_wait); - /* - * At this point we stop accepting input. To do this, we - * disable the receiver and receive interrupts. - */ - info->zs_channel->curregs[3] &= ~RxENABLE; - write_zsreg(info->zs_channel, 3, info->zs_channel->curregs[3]); - info->zs_channel->curregs[1] = 0; /* disable any rx ints */ - write_zsreg(info->zs_channel, 1, info->zs_channel->curregs[1]); - ZS_CLEARFIFO(info->zs_channel); - if (info->flags & ZILOG_INITIALIZED) { - /* - * Before we drop DTR, make sure the SCC transmitter - * has completely drained. - */ - rs_wait_until_sent(tty, info->timeout); - } - - shutdown(info); - if (tty->driver->flush_buffer) - tty->driver->flush_buffer(tty); - tty_ldisc_flush(tty); - tty->closing = 0; - info->event = 0; - info->tty = 0; - if (info->blocked_open) { - if (info->close_delay) { - msleep_interruptible(jiffies_to_msecs(info->close_delay)); - } - wake_up_interruptible(&info->open_wait); - } - info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CLOSING); - wake_up_interruptible(&info->close_wait); - spin_unlock_irqrestore(&zs_lock, flags); -} - -/* - * rs_wait_until_sent() --- wait until the transmitter is empty - */ -static void rs_wait_until_sent(struct tty_struct *tty, int timeout) -{ - struct dec_serial *info = (struct dec_serial *) tty->driver_data; - unsigned long orig_jiffies; - int char_time; - - if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent")) - return; - - orig_jiffies = jiffies; - /* - * Set the check interval to be 1/5 of the estimated time to - * send a single character, and make it at least 1. The check - * interval should also be less than the timeout. - */ - char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; - char_time = char_time / 5; - if (char_time == 0) - char_time = 1; - if (timeout) - char_time = min(char_time, timeout); - while ((read_zsreg(info->zs_channel, 1) & Tx_BUF_EMP) == 0) { - msleep_interruptible(jiffies_to_msecs(char_time)); - if (signal_pending(current)) - break; - if (timeout && time_after(jiffies, orig_jiffies + timeout)) - break; - } - current->state = TASK_RUNNING; -} - -/* - * rs_hangup() --- called by tty_hangup() when a hangup is signaled. - */ -static void rs_hangup(struct tty_struct *tty) -{ - struct dec_serial * info = (struct dec_serial *)tty->driver_data; - - if (serial_paranoia_check(info, tty->name, "rs_hangup")) - return; - - rs_flush_buffer(tty); - shutdown(info); - info->event = 0; - info->count = 0; - info->flags &= ~ZILOG_NORMAL_ACTIVE; - info->tty = 0; - wake_up_interruptible(&info->open_wait); -} - -/* - * ------------------------------------------------------------ - * rs_open() and friends - * ------------------------------------------------------------ - */ -static int block_til_ready(struct tty_struct *tty, struct file * filp, - struct dec_serial *info) -{ - DECLARE_WAITQUEUE(wait, current); - int retval; - int do_clocal = 0; - - /* - * If the device is in the middle of being closed, then block - * until it's done, and then try again. - */ - if (info->flags & ZILOG_CLOSING) { - interruptible_sleep_on(&info->close_wait); -#ifdef SERIAL_DO_RESTART - return ((info->flags & ZILOG_HUP_NOTIFY) ? - -EAGAIN : -ERESTARTSYS); -#else - return -EAGAIN; -#endif - } - - /* - * If non-blocking mode is set, or the port is not enabled, - * then make the check up front and then exit. - */ - if ((filp->f_flags & O_NONBLOCK) || - (tty->flags & (1 << TTY_IO_ERROR))) { - info->flags |= ZILOG_NORMAL_ACTIVE; - return 0; - } - - if (tty->termios->c_cflag & CLOCAL) - do_clocal = 1; - - /* - * Block waiting for the carrier detect and the line to become - * free (i.e., not in use by the callout). While we are in - * this loop, info->count is dropped by one, so that - * rs_close() knows when to free things. We restore it upon - * exit, either normal or abnormal. - */ - retval = 0; - add_wait_queue(&info->open_wait, &wait); -#ifdef SERIAL_DEBUG_OPEN - printk("block_til_ready before block: ttyS%d, count = %d\n", - info->line, info->count); -#endif - spin_lock(&zs_lock); - if (!tty_hung_up_p(filp)) - info->count--; - spin_unlock_irq(&zs_lock); - info->blocked_open++; - while (1) { - spin_lock(&zs_lock); - if (tty->termios->c_cflag & CBAUD) - zs_rtsdtr(info, RTS | DTR, 1); - spin_unlock_irq(&zs_lock); - set_current_state(TASK_INTERRUPTIBLE); - if (tty_hung_up_p(filp) || - !(info->flags & ZILOG_INITIALIZED)) { -#ifdef SERIAL_DO_RESTART - if (info->flags & ZILOG_HUP_NOTIFY) - retval = -EAGAIN; - else - retval = -ERESTARTSYS; -#else - retval = -EAGAIN; -#endif - break; - } - if (!(info->flags & ZILOG_CLOSING) && - (do_clocal || (read_zsreg(info->zs_channel, 0) & DCD))) - break; - if (signal_pending(current)) { - retval = -ERESTARTSYS; - break; - } -#ifdef SERIAL_DEBUG_OPEN - printk("block_til_ready blocking: ttyS%d, count = %d\n", - info->line, info->count); -#endif - schedule(); - } - current->state = TASK_RUNNING; - remove_wait_queue(&info->open_wait, &wait); - if (!tty_hung_up_p(filp)) - info->count++; - info->blocked_open--; -#ifdef SERIAL_DEBUG_OPEN - printk("block_til_ready after blocking: ttyS%d, count = %d\n", - info->line, info->count); -#endif - if (retval) - return retval; - info->flags |= ZILOG_NORMAL_ACTIVE; - return 0; -} - -/* - * This routine is called whenever a serial port is opened. It - * enables interrupts for a serial port, linking in its ZILOG structure into - * the IRQ chain. It also performs the serial-specific - * initialization for the tty structure. - */ -static int rs_open(struct tty_struct *tty, struct file * filp) -{ - struct dec_serial *info; - int retval, line; - - line = tty->index; - if ((line < 0) || (line >= zs_channels_found)) - return -ENODEV; - info = zs_soft + line; - - if (info->hook) - return -ENODEV; - - if (serial_paranoia_check(info, tty->name, "rs_open")) - return -ENODEV; -#ifdef SERIAL_DEBUG_OPEN - printk("rs_open %s, count = %d\n", tty->name, info->count); -#endif - - info->count++; - tty->driver_data = info; - info->tty = tty; - - /* - * If the port is the middle of closing, bail out now - */ - if (tty_hung_up_p(filp) || - (info->flags & ZILOG_CLOSING)) { - if (info->flags & ZILOG_CLOSING) - interruptible_sleep_on(&info->close_wait); -#ifdef SERIAL_DO_RESTART - return ((info->flags & ZILOG_HUP_NOTIFY) ? - -EAGAIN : -ERESTARTSYS); -#else - return -EAGAIN; -#endif - } - - /* - * Start up serial port - */ - retval = zs_startup(info); - if (retval) - return retval; - - retval = block_til_ready(tty, filp, info); - if (retval) { -#ifdef SERIAL_DEBUG_OPEN - printk("rs_open returning after block_til_ready with %d\n", - retval); -#endif - return retval; - } - -#ifdef CONFIG_SERIAL_DEC_CONSOLE - if (zs_console.cflag && zs_console.index == line) { - tty->termios->c_cflag = zs_console.cflag; - zs_console.cflag = 0; - change_speed(info); - } -#endif - -#ifdef SERIAL_DEBUG_OPEN - printk("rs_open %s successful...", tty->name); -#endif -/* tty->low_latency = 1; */ - return 0; -} - -/* Finally, routines used to initialize the serial driver. */ - -static void __init show_serial_version(void) -{ - printk("DECstation Z8530 serial driver version 0.09\n"); -} - -/* Initialize Z8530s zs_channels - */ - -static void __init probe_sccs(void) -{ - struct dec_serial **pp; - int i, n, n_chips = 0, n_channels, chip, channel; - unsigned long flags; - - /* - * did we get here by accident? - */ - if(!BUS_PRESENT) { - printk("Not on JUNKIO machine, skipping probe_sccs\n"); - return; - } - - switch(mips_machtype) { -#ifdef CONFIG_MACH_DECSTATION - case MACH_DS5000_2X0: - case MACH_DS5900: - n_chips = 2; - zs_parms = &ds_parms; - zs_parms->irq0 = dec_interrupt[DEC_IRQ_SCC0]; - zs_parms->irq1 = dec_interrupt[DEC_IRQ_SCC1]; - break; - case MACH_DS5000_1XX: - n_chips = 2; - zs_parms = &ds_parms; - zs_parms->irq0 = dec_interrupt[DEC_IRQ_SCC0]; - zs_parms->irq1 = dec_interrupt[DEC_IRQ_SCC1]; - break; - case MACH_DS5000_XX: - n_chips = 1; - zs_parms = &ds_parms; - zs_parms->irq0 = dec_interrupt[DEC_IRQ_SCC0]; - break; -#endif - default: - panic("zs: unsupported bus"); - } - if (!zs_parms) - panic("zs: uninitialized parms"); - - pp = &zs_chain; - - n_channels = 0; - - for (chip = 0; chip < n_chips; chip++) { - for (channel = 0; channel <= 1; channel++) { - /* - * The sccs reside on the high byte of the 16 bit IOBUS - */ - zs_channels[n_channels].control = - (volatile void *)CKSEG1ADDR(dec_kn_slot_base + - (0 == chip ? zs_parms->scc0 : zs_parms->scc1) + - (0 == channel ? zs_parms->channel_a_offset : - zs_parms->channel_b_offset)); - zs_channels[n_channels].data = - zs_channels[n_channels].control + 4; - -#ifndef CONFIG_SERIAL_DEC_CONSOLE - /* - * We're called early and memory managment isn't up, yet. - * Thus request_region would fail. - */ - if (!request_region((unsigned long) - zs_channels[n_channels].control, - ZS_CHAN_IO_SIZE, "SCC")) - panic("SCC I/O region is not free"); -#endif - zs_soft[n_channels].zs_channel = &zs_channels[n_channels]; - /* HACK alert! */ - if (!(chip & 1)) - zs_soft[n_channels].irq = zs_parms->irq0; - else - zs_soft[n_channels].irq = zs_parms->irq1; - - /* - * Identification of channel A. Location of channel A - * inside chip depends on mapping of internal address - * the chip decodes channels by. - * CHANNEL_A_NR returns either 0 (in case of - * DECstations) or 1 (in case of Baget). - */ - if (CHANNEL_A_NR == channel) - zs_soft[n_channels].zs_chan_a = - &zs_channels[n_channels+1-2*CHANNEL_A_NR]; - else - zs_soft[n_channels].zs_chan_a = - &zs_channels[n_channels]; - - *pp = &zs_soft[n_channels]; - pp = &zs_soft[n_channels].zs_next; - n_channels++; - } - } - - *pp = 0; - zs_channels_found = n_channels; - - for (n = 0; n < zs_channels_found; n++) { - for (i = 0; i < 16; i++) { - zs_soft[n].zs_channel->curregs[i] = zs_init_regs[i]; - } - } - - spin_lock_irqsave(&zs_lock, flags); - for (n = 0; n < zs_channels_found; n++) { - if (n % 2 == 0) { - write_zsreg(zs_soft[n].zs_chan_a, R9, FHWRES); - udelay(10); - write_zsreg(zs_soft[n].zs_chan_a, R9, 0); - } - load_zsregs(zs_soft[n].zs_channel, - zs_soft[n].zs_channel->curregs); - } - spin_unlock_irqrestore(&zs_lock, flags); -} - -static const struct tty_operations serial_ops = { - .open = rs_open, - .close = rs_close, - .write = rs_write, - .flush_chars = rs_flush_chars, - .write_room = rs_write_room, - .chars_in_buffer = rs_chars_in_buffer, - .flush_buffer = rs_flush_buffer, - .ioctl = rs_ioctl, - .throttle = rs_throttle, - .unthrottle = rs_unthrottle, - .set_termios = rs_set_termios, - .stop = rs_stop, - .start = rs_start, - .hangup = rs_hangup, - .break_ctl = rs_break, - .wait_until_sent = rs_wait_until_sent, - .tiocmget = rs_tiocmget, - .tiocmset = rs_tiocmset, -}; - -/* zs_init inits the driver */ -int __init zs_init(void) -{ - int channel, i; - struct dec_serial *info; - - if(!BUS_PRESENT) - return -ENODEV; - - /* Find out how many Z8530 SCCs we have */ - if (zs_chain == 0) - probe_sccs(); - serial_driver = alloc_tty_driver(zs_channels_found); - if (!serial_driver) - return -ENOMEM; - - show_serial_version(); - - /* Initialize the tty_driver structure */ - /* Not all of this is exactly right for us. */ - - serial_driver->owner = THIS_MODULE; - serial_driver->name = "ttyS"; - serial_driver->major = TTY_MAJOR; - serial_driver->minor_start = 64; - serial_driver->type = TTY_DRIVER_TYPE_SERIAL; - serial_driver->subtype = SERIAL_TYPE_NORMAL; - serial_driver->init_termios = tty_std_termios; - serial_driver->init_termios.c_cflag = - B9600 | CS8 | CREAD | HUPCL | CLOCAL; - serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; - tty_set_operations(serial_driver, &serial_ops); - - if (tty_register_driver(serial_driver)) - panic("Couldn't register serial driver"); - - for (info = zs_chain, i = 0; info; info = info->zs_next, i++) { - - /* Needed before interrupts are enabled. */ - info->tty = 0; - info->x_char = 0; - - if (info->hook && info->hook->init_info) { - (*info->hook->init_info)(info); - continue; - } - - info->magic = SERIAL_MAGIC; - info->port = (int) info->zs_channel->control; - info->line = i; - info->custom_divisor = 16; - info->close_delay = 50; - info->closing_wait = 3000; - info->event = 0; - info->count = 0; - info->blocked_open = 0; - tasklet_init(&info->tlet, do_softint, (unsigned long)info); - init_waitqueue_head(&info->open_wait); - init_waitqueue_head(&info->close_wait); - printk("ttyS%02d at 0x%08x (irq = %d) is a Z85C30 SCC\n", - info->line, info->port, info->irq); - tty_register_device(serial_driver, info->line, NULL); - - } - - for (channel = 0; channel < zs_channels_found; ++channel) { - zs_soft[channel].clk_divisor = 16; - zs_soft[channel].zs_baud = get_zsbaud(&zs_soft[channel]); - - if (request_irq(zs_soft[channel].irq, rs_interrupt, IRQF_SHARED, - "scc", &zs_soft[channel])) - printk(KERN_ERR "decserial: can't get irq %d\n", - zs_soft[channel].irq); - - if (zs_soft[channel].hook) { - zs_startup(&zs_soft[channel]); - if (zs_soft[channel].hook->init_channel) - (*zs_soft[channel].hook->init_channel) - (&zs_soft[channel]); - } - } - - return 0; -} - -/* - * polling I/O routines - */ -static int zs_poll_tx_char(void *handle, unsigned char ch) -{ - struct dec_serial *info = handle; - struct dec_zschannel *chan = info->zs_channel; - int ret; - - if(chan) { - int loops = 10000; - - while (loops && !(read_zsreg(chan, 0) & Tx_BUF_EMP)) - loops--; - - if (loops) { - write_zsdata(chan, ch); - ret = 0; - } else - ret = -EAGAIN; - - return ret; - } else - return -ENODEV; -} - -static int zs_poll_rx_char(void *handle) -{ - struct dec_serial *info = handle; - struct dec_zschannel *chan = info->zs_channel; - int ret; - - if(chan) { - int loops = 10000; - - while (loops && !(read_zsreg(chan, 0) & Rx_CH_AV)) - loops--; - - if (loops) - ret = read_zsdata(chan); - else - ret = -EAGAIN; - - return ret; - } else - return -ENODEV; -} - -int register_zs_hook(unsigned int channel, struct dec_serial_hook *hook) -{ - struct dec_serial *info = &zs_soft[channel]; - - if (info->hook) { - printk("%s: line %d has already a hook registered\n", - __FUNCTION__, channel); - - return 0; - } else { - hook->poll_rx_char = zs_poll_rx_char; - hook->poll_tx_char = zs_poll_tx_char; - info->hook = hook; - - return 1; - } -} - -int unregister_zs_hook(unsigned int channel) -{ - struct dec_serial *info = &zs_soft[channel]; - - if (info->hook) { - info->hook = NULL; - return 1; - } else { - printk("%s: trying to unregister hook on line %d," - " but none is registered\n", __FUNCTION__, channel); - return 0; - } -} - -/* - * ------------------------------------------------------------ - * Serial console driver - * ------------------------------------------------------------ - */ -#ifdef CONFIG_SERIAL_DEC_CONSOLE - - -/* - * Print a string to the serial port trying not to disturb - * any possible real use of the port... - */ -static void serial_console_write(struct console *co, const char *s, - unsigned count) -{ - struct dec_serial *info; - int i; - - info = zs_soft + co->index; - - for (i = 0; i < count; i++, s++) { - if(*s == '\n') - zs_poll_tx_char(info, '\r'); - zs_poll_tx_char(info, *s); - } -} - -static struct tty_driver *serial_console_device(struct console *c, int *index) -{ - *index = c->index; - return serial_driver; -} - -/* - * Setup initial baud/bits/parity. We do two things here: - * - construct a cflag setting for the first rs_open() - * - initialize the serial port - * Return non-zero if we didn't find a serial port. - */ -static int __init serial_console_setup(struct console *co, char *options) -{ - struct dec_serial *info; - int baud = 9600; - int bits = 8; - int parity = 'n'; - int cflag = CREAD | HUPCL | CLOCAL; - int clk_divisor = 16; - int brg; - char *s; - unsigned long flags; - - if(!BUS_PRESENT) - return -ENODEV; - - info = zs_soft + co->index; - - if (zs_chain == 0) - probe_sccs(); - - info->is_cons = 1; - - if (options) { - baud = simple_strtoul(options, NULL, 10); - s = options; - while(*s >= '0' && *s <= '9') - s++; - if (*s) - parity = *s++; - if (*s) - bits = *s - '0'; - } - - /* - * Now construct a cflag setting. - */ - switch(baud) { - case 1200: - cflag |= B1200; - break; - case 2400: - cflag |= B2400; - break; - case 4800: - cflag |= B4800; - break; - case 19200: - cflag |= B19200; - break; - case 38400: - cflag |= B38400; - break; - case 57600: - cflag |= B57600; - break; - case 115200: - cflag |= B115200; - break; - case 9600: - default: - cflag |= B9600; - /* - * Set this to a sane value to prevent a divide error. - */ - baud = 9600; - break; - } - switch(bits) { - case 7: - cflag |= CS7; - break; - default: - case 8: - cflag |= CS8; - break; - } - switch(parity) { - case 'o': case 'O': - cflag |= PARODD; - break; - case 'e': case 'E': - cflag |= PARENB; - break; - } - co->cflag = cflag; - - spin_lock_irqsave(&zs_lock, flags); - - /* - * Set up the baud rate generator. - */ - brg = BPS_TO_BRG(baud, zs_parms->clock / clk_divisor); - info->zs_channel->curregs[R12] = (brg & 255); - info->zs_channel->curregs[R13] = ((brg >> 8) & 255); - - /* - * Set byte size and parity. - */ - if (bits == 7) { - info->zs_channel->curregs[R3] |= Rx7; - info->zs_channel->curregs[R5] |= Tx7; - } else { - info->zs_channel->curregs[R3] |= Rx8; - info->zs_channel->curregs[R5] |= Tx8; - } - if (cflag & PARENB) { - info->zs_channel->curregs[R4] |= PAR_ENA; - } - if (!(cflag & PARODD)) { - info->zs_channel->curregs[R4] |= PAR_EVEN; - } - info->zs_channel->curregs[R4] |= SB1; - - /* - * Turn on RTS and DTR. - */ - zs_rtsdtr(info, RTS | DTR, 1); - - /* - * Finally, enable sequencing. - */ - info->zs_channel->curregs[R3] |= RxENABLE; - info->zs_channel->curregs[R5] |= TxENAB; - - /* - * Clear the interrupt registers. - */ - write_zsreg(info->zs_channel, R0, ERR_RES); - write_zsreg(info->zs_channel, R0, RES_H_IUS); - - /* - * Load up the new values. - */ - load_zsregs(info->zs_channel, info->zs_channel->curregs); - - /* Save the current value of RR0 */ - info->read_reg_zero = read_zsreg(info->zs_channel, R0); - - zs_soft[co->index].clk_divisor = clk_divisor; - zs_soft[co->index].zs_baud = get_zsbaud(&zs_soft[co->index]); - - spin_unlock_irqrestore(&zs_lock, flags); - - return 0; -} - -static struct console zs_console = { - .name = "ttyS", - .write = serial_console_write, - .device = serial_console_device, - .setup = serial_console_setup, - .flags = CON_PRINTBUFFER, - .index = -1, -}; - -/* - * Register console. - */ -void __init zs_serial_console_init(void) -{ - register_console(&zs_console); -} -#endif /* ifdef CONFIG_SERIAL_DEC_CONSOLE */ - -#ifdef CONFIG_KGDB -struct dec_zschannel *zs_kgdbchan; -static unsigned char scc_inittab[] = { - 9, 0x80, /* reset A side (CHRA) */ - 13, 0, /* set baud rate divisor */ - 12, 1, - 14, 1, /* baud rate gen enable, src=rtxc (BRENABL) */ - 11, 0x50, /* clocks = br gen (RCBR | TCBR) */ - 5, 0x6a, /* tx 8 bits, assert RTS (Tx8 | TxENAB | RTS) */ - 4, 0x44, /* x16 clock, 1 stop (SB1 | X16CLK)*/ - 3, 0xc1, /* rx enable, 8 bits (RxENABLE | Rx8)*/ -}; - -/* These are for receiving and sending characters under the kgdb - * source level kernel debugger. - */ -void putDebugChar(char kgdb_char) -{ - struct dec_zschannel *chan = zs_kgdbchan; - while ((read_zsreg(chan, 0) & Tx_BUF_EMP) == 0) - RECOVERY_DELAY; - write_zsdata(chan, kgdb_char); -} -char getDebugChar(void) -{ - struct dec_zschannel *chan = zs_kgdbchan; - while((read_zsreg(chan, 0) & Rx_CH_AV) == 0) - eieio(); /*barrier();*/ - return read_zsdata(chan); -} -void kgdb_interruptible(int yes) -{ - struct dec_zschannel *chan = zs_kgdbchan; - int one, nine; - nine = read_zsreg(chan, 9); - if (yes == 1) { - one = EXT_INT_ENAB|RxINT_ALL; - nine |= MIE; - printk("turning serial ints on\n"); - } else { - one = RxINT_DISAB; - nine &= ~MIE; - printk("turning serial ints off\n"); - } - write_zsreg(chan, 1, one); - write_zsreg(chan, 9, nine); -} - -static int kgdbhook_init_channel(void *handle) -{ - return 0; -} - -static void kgdbhook_init_info(void *handle) -{ -} - -static void kgdbhook_rx_char(void *handle, unsigned char ch, unsigned char fl) -{ - struct dec_serial *info = handle; - - if (fl != TTY_NORMAL) - return; - if (ch == 0x03 || ch == '$') - breakpoint(); -} - -/* This sets up the serial port we're using, and turns on - * interrupts for that channel, so kgdb is usable once we're done. - */ -static inline void kgdb_chaninit(struct dec_zschannel *ms, int intson, int bps) -{ - int brg; - int i, x; - volatile char *sccc = ms->control; - brg = BPS_TO_BRG(bps, zs_parms->clock/16); - printk("setting bps on kgdb line to %d [brg=%x]\n", bps, brg); - for (i = 20000; i != 0; --i) { - x = *sccc; eieio(); - } - for (i = 0; i < sizeof(scc_inittab); ++i) { - write_zsreg(ms, scc_inittab[i], scc_inittab[i+1]); - i++; - } -} -/* This is called at boot time to prime the kgdb serial debugging - * serial line. The 'tty_num' argument is 0 for /dev/ttya and 1 - * for /dev/ttyb which is determined in setup_arch() from the - * boot command line flags. - */ -struct dec_serial_hook zs_kgdbhook = { - .init_channel = kgdbhook_init_channel, - .init_info = kgdbhook_init_info, - .rx_char = kgdbhook_rx_char, - .cflags = B38400 | CS8 | CLOCAL, -}; - -void __init zs_kgdb_hook(int tty_num) -{ - /* Find out how many Z8530 SCCs we have */ - if (zs_chain == 0) - probe_sccs(); - zs_soft[tty_num].zs_channel = &zs_channels[tty_num]; - zs_kgdbchan = zs_soft[tty_num].zs_channel; - zs_soft[tty_num].change_needed = 0; - zs_soft[tty_num].clk_divisor = 16; - zs_soft[tty_num].zs_baud = 38400; - zs_soft[tty_num].hook = &zs_kgdbhook; /* This runs kgdb */ - /* Turn on transmitter/receiver at 8-bits/char */ - kgdb_chaninit(zs_soft[tty_num].zs_channel, 1, 38400); - printk("KGDB: on channel %d initialized\n", tty_num); - set_debug_traps(); /* init stub */ -} -#endif /* ifdef CONFIG_KGDB */ |
