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[MIPS] zs.c: Resurrect the deceased zs.c for now.
Not that it's meant to be sustained for long, but from time to time it's useful to have some console... Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Maciej W. Rozycki
Ralf Baechle
parent
e0c9b79730
commit
0905780aae
150
drivers/tc/zs.c
150
drivers/tc/zs.c
@ -6,7 +6,7 @@
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*
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* DECstation changes
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* Copyright (C) 1998-2000 Harald Koerfgen
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* Copyright (C) 2000, 2001, 2002, 2003, 2004 Maciej W. Rozycki
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* Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 Maciej W. Rozycki
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*
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* For the rest of the code the original Copyright applies:
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* Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au)
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@ -55,6 +55,7 @@
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/spinlock.h>
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#ifdef CONFIG_SERIAL_DEC_CONSOLE
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#include <linux/console.h>
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#endif
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@ -63,7 +64,6 @@
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#include <asm/pgtable.h>
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#include <asm/irq.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/bootinfo.h>
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#include <asm/dec/interrupts.h>
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@ -128,6 +128,8 @@ static struct zs_parms ds_parms = {
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#define BUS_PRESENT (DS_BUS_PRESENT)
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DEFINE_SPINLOCK(zs_lock);
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struct dec_zschannel zs_channels[NUM_CHANNELS];
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struct dec_serial zs_soft[NUM_CHANNELS];
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int zs_channels_found;
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@ -159,8 +161,6 @@ static unsigned char zs_init_regs[16] __initdata = {
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0 /* write 15 */
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};
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DECLARE_TASK_QUEUE(tq_zs_serial);
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static struct tty_driver *serial_driver;
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/* serial subtype definitions */
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@ -294,8 +294,7 @@ static inline void zs_rtsdtr(struct dec_serial *info, int which, int set)
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{
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unsigned long flags;
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save_flags(flags); cli();
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spin_lock_irqsave(&zs_lock, flags);
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if (info->zs_channel != info->zs_chan_a) {
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if (set) {
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info->zs_chan_a->curregs[5] |= (which & (RTS | DTR));
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@ -304,7 +303,7 @@ static inline void zs_rtsdtr(struct dec_serial *info, int which, int set)
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}
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write_zsreg(info->zs_chan_a, 5, info->zs_chan_a->curregs[5]);
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}
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restore_flags(flags);
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spin_unlock_irqrestore(&zs_lock, flags);
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}
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/* Utility routines for the Zilog */
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@ -345,12 +344,10 @@ static inline void rs_recv_clear(struct dec_zschannel *zsc)
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* This routine is used by the interrupt handler to schedule
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* processing in the software interrupt portion of the driver.
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*/
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static _INLINE_ void rs_sched_event(struct dec_serial *info,
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int event)
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static _INLINE_ void rs_sched_event(struct dec_serial *info, int event)
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{
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info->event |= 1 << event;
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queue_task(&info->tqueue, &tq_zs_serial);
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mark_bh(SERIAL_BH);
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tasklet_schedule(&info->tlet);
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}
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static _INLINE_ void receive_chars(struct dec_serial *info,
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@ -497,9 +494,10 @@ static _INLINE_ void status_handle(struct dec_serial *info)
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/*
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* This is the serial driver's generic interrupt routine
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*/
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void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
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static irqreturn_t rs_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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{
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struct dec_serial *info = (struct dec_serial *) dev_id;
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irqreturn_t status = IRQ_NONE;
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unsigned char zs_intreg;
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int shift;
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@ -521,6 +519,8 @@ void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
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if ((zs_intreg & CHAN_IRQMASK) == 0)
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break;
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status = IRQ_HANDLED;
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if (zs_intreg & CHBRxIP) {
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receive_chars(info, regs);
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}
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@ -534,6 +534,8 @@ void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
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/* Why do we need this ? */
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write_zsreg(info->zs_channel, 0, RES_H_IUS);
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return status;
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}
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#ifdef ZS_DEBUG_REGS
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@ -578,12 +580,12 @@ static void rs_stop(struct tty_struct *tty)
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return;
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#if 1
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save_flags(flags); cli();
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spin_lock_irqsave(&zs_lock, flags);
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if (info->zs_channel->curregs[5] & TxENAB) {
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info->zs_channel->curregs[5] &= ~TxENAB;
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write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]);
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}
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restore_flags(flags);
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spin_unlock_irqrestore(&zs_lock, flags);
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#endif
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}
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@ -595,7 +597,7 @@ static void rs_start(struct tty_struct *tty)
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if (serial_paranoia_check(info, tty->name, "rs_start"))
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return;
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save_flags(flags); cli();
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spin_lock_irqsave(&zs_lock, flags);
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#if 1
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if (info->xmit_cnt && info->xmit_buf && !(info->zs_channel->curregs[5] & TxENAB)) {
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info->zs_channel->curregs[5] |= TxENAB;
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@ -606,7 +608,7 @@ static void rs_start(struct tty_struct *tty)
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transmit_chars(info);
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}
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#endif
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restore_flags(flags);
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spin_unlock_irqrestore(&zs_lock, flags);
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}
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/*
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@ -618,12 +620,8 @@ static void rs_start(struct tty_struct *tty)
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* interrupt driver proper are done; the interrupt driver schedules
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* them using rs_sched_event(), and they get done here.
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*/
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static void do_serial_bh(void)
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{
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run_task_queue(&tq_zs_serial);
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}
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static void do_softint(void *private_)
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static void do_softint(unsigned long private_)
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{
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struct dec_serial *info = (struct dec_serial *) private_;
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struct tty_struct *tty;
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@ -634,10 +632,11 @@ static void do_softint(void *private_)
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if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
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tty_wakeup(tty);
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wake_up_interruptible(&tty->write_wait);
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}
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}
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int zs_startup(struct dec_serial * info)
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static int zs_startup(struct dec_serial * info)
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{
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unsigned long flags;
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@ -650,7 +649,7 @@ int zs_startup(struct dec_serial * info)
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return -ENOMEM;
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}
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save_flags(flags); cli();
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spin_lock_irqsave(&zs_lock, flags);
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#ifdef SERIAL_DEBUG_OPEN
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printk("starting up ttyS%d (irq %d)...", info->line, info->irq);
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@ -706,7 +705,7 @@ int zs_startup(struct dec_serial * info)
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info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
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info->flags |= ZILOG_INITIALIZED;
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restore_flags(flags);
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spin_unlock_irqrestore(&zs_lock, flags);
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return 0;
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}
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@ -726,7 +725,7 @@ static void shutdown(struct dec_serial * info)
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info->irq);
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#endif
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save_flags(flags); cli(); /* Disable interrupts */
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spin_lock_irqsave(&zs_lock, flags);
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if (info->xmit_buf) {
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free_page((unsigned long) info->xmit_buf);
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@ -749,7 +748,7 @@ static void shutdown(struct dec_serial * info)
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set_bit(TTY_IO_ERROR, &info->tty->flags);
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info->flags &= ~ZILOG_INITIALIZED;
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restore_flags(flags);
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spin_unlock_irqrestore(&zs_lock, flags);
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}
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/*
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@ -785,7 +784,7 @@ static void change_speed(struct dec_serial *info)
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i += 15;
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}
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save_flags(flags); cli();
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spin_lock_irqsave(&zs_lock, flags);
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info->zs_baud = baud_table[i];
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if (info->zs_baud) {
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brg = BPS_TO_BRG(info->zs_baud, zs_parms->clock/info->clk_divisor);
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@ -858,7 +857,7 @@ static void change_speed(struct dec_serial *info)
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/* Load up the new values */
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load_zsregs(info->zs_channel, info->zs_channel->curregs);
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restore_flags(flags);
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spin_unlock_irqrestore(&zs_lock, flags);
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}
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static void rs_flush_chars(struct tty_struct *tty)
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@ -874,9 +873,9 @@ static void rs_flush_chars(struct tty_struct *tty)
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return;
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/* Enable transmitter */
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save_flags(flags); cli();
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spin_lock_irqsave(&zs_lock, flags);
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transmit_chars(info);
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restore_flags(flags);
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spin_unlock_irqrestore(&zs_lock, flags);
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}
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static int rs_write(struct tty_struct * tty,
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@ -892,26 +891,17 @@ static int rs_write(struct tty_struct * tty,
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if (!tty || !info->xmit_buf)
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return 0;
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save_flags(flags);
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while (1) {
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cli();
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spin_lock_irqsave(&zs_lock, flags);
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c = min(count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
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SERIAL_XMIT_SIZE - info->xmit_head));
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if (c <= 0)
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break;
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if (from_user) {
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down(&tmp_buf_sem);
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copy_from_user(tmp_buf, buf, c);
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c = min(c, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
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SERIAL_XMIT_SIZE - info->xmit_head));
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memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c);
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up(&tmp_buf_sem);
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} else
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memcpy(info->xmit_buf + info->xmit_head, buf, c);
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memcpy(info->xmit_buf + info->xmit_head, buf, c);
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info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
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info->xmit_cnt += c;
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restore_flags(flags);
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spin_unlock_irqrestore(&zs_lock, flags);
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buf += c;
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count -= c;
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total += c;
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@ -920,7 +910,7 @@ static int rs_write(struct tty_struct * tty,
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if (info->xmit_cnt && !tty->stopped && !info->tx_stopped
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&& !info->tx_active)
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transmit_chars(info);
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restore_flags(flags);
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spin_unlock_irqrestore(&zs_lock, flags);
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return total;
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}
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@ -952,9 +942,9 @@ static void rs_flush_buffer(struct tty_struct *tty)
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if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
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return;
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cli();
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spin_lock_irq(&zs_lock);
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info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
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sti();
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spin_unlock_irq(&zs_lock);
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tty_wakeup(tty);
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}
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@ -982,11 +972,11 @@ static void rs_throttle(struct tty_struct * tty)
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return;
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if (I_IXOFF(tty)) {
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save_flags(flags); cli();
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spin_lock_irqsave(&zs_lock, flags);
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info->x_char = STOP_CHAR(tty);
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if (!info->tx_active)
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transmit_chars(info);
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restore_flags(flags);
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spin_unlock_irqrestore(&zs_lock, flags);
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}
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if (C_CRTSCTS(tty)) {
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@ -1010,7 +1000,7 @@ static void rs_unthrottle(struct tty_struct * tty)
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return;
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if (I_IXOFF(tty)) {
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save_flags(flags); cli();
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spin_lock_irqsave(&zs_lock, flags);
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if (info->x_char)
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info->x_char = 0;
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else {
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@ -1018,7 +1008,7 @@ static void rs_unthrottle(struct tty_struct * tty)
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if (!info->tx_active)
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transmit_chars(info);
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}
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restore_flags(flags);
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spin_unlock_irqrestore(&zs_lock, flags);
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}
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if (C_CRTSCTS(tty)) {
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@ -1111,9 +1101,9 @@ static int get_lsr_info(struct dec_serial * info, unsigned int *value)
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{
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unsigned char status;
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cli();
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spin_lock(&zs_lock);
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status = read_zsreg(info->zs_channel, 0);
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sti();
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spin_unlock_irq(&zs_lock);
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put_user(status,value);
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return 0;
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}
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@ -1136,11 +1126,11 @@ static int rs_tiocmget(struct tty_struct *tty, struct file *file)
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if (info->zs_channel == info->zs_chan_a)
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result = 0;
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else {
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cli();
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spin_lock(&zs_lock);
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control = info->zs_chan_a->curregs[5];
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status_a = read_zsreg(info->zs_chan_a, 0);
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status_b = read_zsreg(info->zs_channel, 0);
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sti();
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spin_unlock_irq(&zs_lock);
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result = ((control & RTS) ? TIOCM_RTS: 0)
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| ((control & DTR) ? TIOCM_DTR: 0)
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| ((status_b & DCD) ? TIOCM_CAR: 0)
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@ -1155,8 +1145,6 @@ static int rs_tiocmset(struct tty_struct *tty, struct file *file,
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unsigned int set, unsigned int clear)
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{
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struct dec_serial * info = (struct dec_serial *)tty->driver_data;
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int error;
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unsigned int arg, bits;
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if (info->hook)
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return -ENODEV;
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@ -1170,8 +1158,7 @@ static int rs_tiocmset(struct tty_struct *tty, struct file *file,
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if (info->zs_channel == info->zs_chan_a)
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return 0;
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get_user(arg, value);
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cli();
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spin_lock(&zs_lock);
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if (set & TIOCM_RTS)
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info->zs_chan_a->curregs[5] |= RTS;
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if (set & TIOCM_DTR)
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@ -1181,7 +1168,7 @@ static int rs_tiocmset(struct tty_struct *tty, struct file *file,
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if (clear & TIOCM_DTR)
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info->zs_chan_a->curregs[5] &= ~DTR;
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write_zsreg(info->zs_chan_a, 5, info->zs_chan_a->curregs[5]);
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sti();
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spin_unlock_irq(&zs_lock);
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return 0;
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}
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@ -1198,19 +1185,18 @@ static void rs_break(struct tty_struct *tty, int break_state)
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if (!info->port)
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return;
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save_flags(flags); cli();
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spin_lock_irqsave(&zs_lock, flags);
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if (break_state == -1)
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info->zs_channel->curregs[5] |= SND_BRK;
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else
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info->zs_channel->curregs[5] &= ~SND_BRK;
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write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]);
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restore_flags(flags);
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spin_unlock_irqrestore(&zs_lock, flags);
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}
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static int rs_ioctl(struct tty_struct *tty, struct file * file,
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unsigned int cmd, unsigned long arg)
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{
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int error;
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struct dec_serial * info = (struct dec_serial *)tty->driver_data;
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if (info->hook)
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@ -1287,10 +1273,10 @@ static void rs_close(struct tty_struct *tty, struct file * filp)
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if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
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return;
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save_flags(flags); cli();
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spin_lock_irqsave(&zs_lock, flags);
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if (tty_hung_up_p(filp)) {
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restore_flags(flags);
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spin_unlock_irqrestore(&zs_lock, flags);
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return;
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}
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@ -1315,7 +1301,7 @@ static void rs_close(struct tty_struct *tty, struct file * filp)
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info->count = 0;
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}
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if (info->count) {
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restore_flags(flags);
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spin_unlock_irqrestore(&zs_lock, flags);
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return;
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}
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info->flags |= ZILOG_CLOSING;
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@ -1358,7 +1344,7 @@ static void rs_close(struct tty_struct *tty, struct file * filp)
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}
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info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CLOSING);
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wake_up_interruptible(&info->close_wait);
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restore_flags(flags);
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spin_unlock_irqrestore(&zs_lock, flags);
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}
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/*
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@ -1398,7 +1384,7 @@ static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
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/*
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* rs_hangup() --- called by tty_hangup() when a hangup is signaled.
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*/
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void rs_hangup(struct tty_struct *tty)
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static void rs_hangup(struct tty_struct *tty)
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{
|
||||
struct dec_serial * info = (struct dec_serial *)tty->driver_data;
|
||||
|
||||
@ -1466,16 +1452,16 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
|
||||
printk("block_til_ready before block: ttyS%d, count = %d\n",
|
||||
info->line, info->count);
|
||||
#endif
|
||||
cli();
|
||||
spin_lock(&zs_lock);
|
||||
if (!tty_hung_up_p(filp))
|
||||
info->count--;
|
||||
sti();
|
||||
spin_unlock_irq(&zs_lock);
|
||||
info->blocked_open++;
|
||||
while (1) {
|
||||
cli();
|
||||
spin_lock(&zs_lock);
|
||||
if (tty->termios->c_cflag & CBAUD)
|
||||
zs_rtsdtr(info, RTS | DTR, 1);
|
||||
sti();
|
||||
spin_unlock_irq(&zs_lock);
|
||||
set_current_state(TASK_INTERRUPTIBLE);
|
||||
if (tty_hung_up_p(filp) ||
|
||||
!(info->flags & ZILOG_INITIALIZED)) {
|
||||
@ -1523,7 +1509,7 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
|
||||
* the IRQ chain. It also performs the serial-specific
|
||||
* initialization for the tty structure.
|
||||
*/
|
||||
int rs_open(struct tty_struct *tty, struct file * filp)
|
||||
static int rs_open(struct tty_struct *tty, struct file * filp)
|
||||
{
|
||||
struct dec_serial *info;
|
||||
int retval, line;
|
||||
@ -1706,7 +1692,7 @@ static void __init probe_sccs(void)
|
||||
}
|
||||
}
|
||||
|
||||
save_and_cli(flags);
|
||||
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);
|
||||
@ -1716,7 +1702,7 @@ static void __init probe_sccs(void)
|
||||
load_zsregs(zs_soft[n].zs_channel,
|
||||
zs_soft[n].zs_channel->curregs);
|
||||
}
|
||||
restore_flags(flags);
|
||||
spin_unlock_irqrestore(&zs_lock, flags);
|
||||
}
|
||||
|
||||
static struct tty_operations serial_ops = {
|
||||
@ -1749,9 +1735,6 @@ int __init zs_init(void)
|
||||
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();
|
||||
@ -1800,8 +1783,7 @@ int __init zs_init(void)
|
||||
info->event = 0;
|
||||
info->count = 0;
|
||||
info->blocked_open = 0;
|
||||
info->tqueue.routine = do_softint;
|
||||
info->tqueue.data = info;
|
||||
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",
|
||||
@ -1833,8 +1815,7 @@ int __init zs_init(void)
|
||||
/*
|
||||
* polling I/O routines
|
||||
*/
|
||||
static int
|
||||
zs_poll_tx_char(void *handle, unsigned char ch)
|
||||
static int zs_poll_tx_char(void *handle, unsigned char ch)
|
||||
{
|
||||
struct dec_serial *info = handle;
|
||||
struct dec_zschannel *chan = info->zs_channel;
|
||||
@ -1857,8 +1838,7 @@ zs_poll_tx_char(void *handle, unsigned char ch)
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
static int
|
||||
zs_poll_rx_char(void *handle)
|
||||
static int zs_poll_rx_char(void *handle)
|
||||
{
|
||||
struct dec_serial *info = handle;
|
||||
struct dec_zschannel *chan = info->zs_channel;
|
||||
@ -2037,7 +2017,7 @@ static int __init serial_console_setup(struct console *co, char *options)
|
||||
}
|
||||
co->cflag = cflag;
|
||||
|
||||
save_and_cli(flags);
|
||||
spin_lock_irqsave(&zs_lock, flags);
|
||||
|
||||
/*
|
||||
* Set up the baud rate generator.
|
||||
@ -2092,7 +2072,7 @@ static int __init serial_console_setup(struct console *co, char *options)
|
||||
zs_soft[co->index].clk_divisor = clk_divisor;
|
||||
zs_soft[co->index].zs_baud = get_zsbaud(&zs_soft[co->index]);
|
||||
|
||||
restore_flags(flags);
|
||||
spin_unlock_irqrestore(&zs_lock, flags);
|
||||
|
||||
return 0;
|
||||
}
|
||||
@ -2229,5 +2209,3 @@ void __init zs_kgdb_hook(int tty_num)
|
||||
set_debug_traps(); /* init stub */
|
||||
}
|
||||
#endif /* ifdef CONFIG_KGDB */
|
||||
|
||||
|
||||
|
||||
@ -6,14 +6,14 @@
|
||||
*
|
||||
* Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au)
|
||||
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
|
||||
* Copyright (C) 2004 Maciej W. Rozycki
|
||||
* Copyright (C) 2004, 2005 Maciej W. Rozycki
|
||||
*/
|
||||
#ifndef _DECSERIAL_H
|
||||
#define _DECSERIAL_H
|
||||
|
||||
#include <asm/dec/serial.h>
|
||||
|
||||
#define NUM_ZSREGS 16
|
||||
#define NUM_ZSREGS 16
|
||||
|
||||
struct serial_struct {
|
||||
int type;
|
||||
@ -139,8 +139,7 @@ struct dec_serial {
|
||||
int xmit_head;
|
||||
int xmit_tail;
|
||||
int xmit_cnt;
|
||||
struct tq_struct tqueue;
|
||||
struct tq_struct tqueue_hangup;
|
||||
struct tasklet_struct tlet;
|
||||
wait_queue_head_t open_wait;
|
||||
wait_queue_head_t close_wait;
|
||||
};
|
||||
@ -282,7 +281,7 @@ struct dec_serial {
|
||||
#define DLC 4 /* Disable Lower Chain */
|
||||
#define MIE 8 /* Master Interrupt Enable */
|
||||
#define STATHI 0x10 /* Status high */
|
||||
#define SOFTACK 0x20 /* Software Interrupt Acknowledge */
|
||||
#define SOFTACK 0x20 /* Software Interrupt Acknowledge */
|
||||
#define NORESET 0 /* No reset on write to R9 */
|
||||
#define CHRB 0x40 /* Reset channel B */
|
||||
#define CHRA 0x80 /* Reset channel A */
|
||||
@ -395,8 +394,8 @@ struct dec_serial {
|
||||
/* Read Register 15 (value of WR 15) */
|
||||
|
||||
/* Misc macros */
|
||||
#define ZS_CLEARERR(channel) (write_zsreg(channel, 0, ERR_RES))
|
||||
#define ZS_CLEARFIFO(channel) do { volatile unsigned char garbage; \
|
||||
#define ZS_CLEARERR(channel) (write_zsreg(channel, 0, ERR_RES))
|
||||
#define ZS_CLEARFIFO(channel) do { volatile unsigned char garbage; \
|
||||
garbage = read_zsdata(channel); \
|
||||
garbage = read_zsdata(channel); \
|
||||
garbage = read_zsdata(channel); \
|
||||
|
||||
Loading…
Reference in New Issue
Block a user