diff options
Diffstat (limited to 'drivers/tc/zs.c')
| -rw-r--r-- | drivers/tc/zs.c | 2253 |
1 files changed, 2253 insertions, 0 deletions
diff --git a/drivers/tc/zs.c b/drivers/tc/zs.c new file mode 100644 index 00000000000..4382ee60b6a --- /dev/null +++ b/drivers/tc/zs.c @@ -0,0 +1,2253 @@ +/* + * 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 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/config.h> +#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> +#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/uaccess.h> +#include <asm/bootinfo.h> +#include <asm/dec/serial.h> + +#ifdef CONFIG_MACH_DECSTATION +#include <asm/dec/interrupts.h> +#include <asm/dec/machtype.h> +#include <asm/dec/tc.h> +#include <asm/dec/ioasic_addrs.h> +#endif +#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) + +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 sercons; +#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 */ +}; + +DECLARE_TASK_QUEUE(tq_zs_serial); + +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 + +#define _INLINE_ inline + +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); + +/* + * tmp_buf is used as a temporary buffer by serial_write. We need to + * lock it in case the copy_from_user blocks while swapping in a page, + * and some other program tries to do a serial write at the same time. + * Since the lock will only come under contention when the system is + * swapping and available memory is low, it makes sense to share one + * buffer across all the serial ports, since it significantly saves + * memory if large numbers of serial ports are open. + */ +static unsigned char tmp_buf[4096]; /* This is cheating */ +static DECLARE_MUTEX(tmp_buf_sem); + +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; + + + save_flags(flags); cli(); + 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]); + } + restore_flags(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 _INLINE_ void rs_sched_event(struct dec_serial *info, + int event) +{ + info->event |= 1 << event; + queue_task(&info->tqueue, &tq_zs_serial); + mark_bh(SERIAL_BH); +} + +static _INLINE_ void receive_chars(struct dec_serial *info, + struct pt_regs *regs) +{ + 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 == sercons.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, regs, 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 _INLINE_ 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 == sercons.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 + */ +void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs) +{ + struct dec_serial *info = (struct dec_serial *) dev_id; + 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; + + if (zs_intreg & CHBRxIP) { + receive_chars(info, regs); + } + 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); +} + +#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 + save_flags(flags); cli(); + if (info->zs_channel->curregs[5] & TxENAB) { + info->zs_channel->curregs[5] &= ~TxENAB; + write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]); + } + restore_flags(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; + + save_flags(flags); cli(); +#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 + restore_flags(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_serial_bh(void) +{ + run_task_queue(&tq_zs_serial); +} + +static void do_softint(void *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); + } +} + +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; + } + + save_flags(flags); cli(); + +#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; + restore_flags(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 + + save_flags(flags); cli(); /* Disable interrupts */ + + 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; + restore_flags(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; + } + + save_flags(flags); cli(); + 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); + + restore_flags(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 */ + save_flags(flags); cli(); + transmit_chars(info); + restore_flags(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; + + save_flags(flags); + while (1) { + cli(); + c = min(count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, + SERIAL_XMIT_SIZE - info->xmit_head)); + if (c <= 0) + break; + + if (from_user) { + down(&tmp_buf_sem); + copy_from_user(tmp_buf, buf, c); + c = min(c, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, + SERIAL_XMIT_SIZE - info->xmit_head)); + memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c); + up(&tmp_buf_sem); + } else + memcpy(info->xmit_buf + info->xmit_head, buf, c); + info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); + info->xmit_cnt += c; + restore_flags(flags); + buf += c; + count -= c; + total += c; + } + + if (info->xmit_cnt && !tty->stopped && !info->tx_stopped + && !info->tx_active) + transmit_chars(info); + restore_flags(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; + cli(); + info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; + sti(); + 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)) { + save_flags(flags); cli(); + info->x_char = STOP_CHAR(tty); + if (!info->tx_active) + transmit_chars(info); + restore_flags(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)) { + save_flags(flags); cli(); + if (info->x_char) + info->x_char = 0; + else { + info->x_char = START_CHAR(tty); + if (!info->tx_active) + transmit_chars(info); + } + restore_flags(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; + + cli(); + status = read_zsreg(info->zs_channel, 0); + sti(); + 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 { + cli(); + control = info->zs_chan_a->curregs[5]; + status_a = read_zsreg(info->zs_chan_a, 0); + status_b = read_zsreg(info->zs_channel, 0); + sti(); + 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; + int error; + unsigned int arg, bits; + + 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; + + get_user(arg, value); + cli(); + 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]); + sti(); + 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; + + save_flags(flags); cli(); + 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]); + restore_flags(flags); +} + +static int rs_ioctl(struct tty_struct *tty, struct file * file, + unsigned int cmd, unsigned long arg) +{ + int error; + 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 termios *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; + + save_flags(flags); cli(); + + if (tty_hung_up_p(filp)) { + restore_flags(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) { + restore_flags(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); + restore_flags(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. + */ +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 + cli(); + if (!tty_hung_up_p(filp)) + info->count--; + sti(); + info->blocked_open++; + while (1) { + cli(); + if (tty->termios->c_cflag & CBAUD) + zs_rtsdtr(info, RTS | DTR, 1); + sti(); + 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. + */ +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 (sercons.cflag && sercons.index == line) { + tty->termios->c_cflag = sercons.cflag; + sercons.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; + } + + /* + * When serial console is activated, tc_init has not been called yet + * and system_base is undefined. Unfortunately we have to hardcode + * system_base for this case :-(. HK + */ + switch(mips_machtype) { +#ifdef CONFIG_MACH_DECSTATION + case MACH_DS5000_2X0: + case MACH_DS5900: + system_base = KSEG1ADDR(0x1f800000); + 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: + system_base = KSEG1ADDR(0x1c000000); + 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: + system_base = KSEG1ADDR(0x1c000000); + 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 unsigned char *)system_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 check_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]; + } + } + + save_and_cli(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); + } + restore_flags(flags); +} + +static 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; + + /* Setup base handler, and timer table. */ + init_bh(SERIAL_BH, do_serial_bh); + + /* 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->devfs_name = "tts/"; + 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_NO_DEVFS; + 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; + info->tqueue.routine = do_softint; + info->tqueue.data = 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, SA_SHIRQ, + "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; + + save_and_cli(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]); + + restore_flags(flags); + + return 0; +} + +static struct console sercons = { + .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(&sercons); +} +#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 */ + + |