cio.c (dca3a783400a18e2bf4503b1d4a85c4d0ca1a7e4) cio.c (188561a462d3b82451d6ba09e2e32c9ba2c9938c)
1/*
2 * S/390 common I/O routines -- low level i/o calls
3 *
4 * Copyright IBM Corp. 1999, 2008
5 * Author(s): Ingo Adlung (adlung@de.ibm.com)
6 * Cornelia Huck (cornelia.huck@de.ibm.com)
7 * Arnd Bergmann (arndb@de.ibm.com)
8 * Martin Schwidefsky (schwidefsky@de.ibm.com)

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651
652#ifdef CONFIG_CCW_CONSOLE
653static struct subchannel console_subchannel;
654static struct io_subchannel_private console_priv;
655static int console_subchannel_in_use;
656
657/*
658 * Use cio_tsch to update the subchannel status and call the interrupt handler
1/*
2 * S/390 common I/O routines -- low level i/o calls
3 *
4 * Copyright IBM Corp. 1999, 2008
5 * Author(s): Ingo Adlung (adlung@de.ibm.com)
6 * Cornelia Huck (cornelia.huck@de.ibm.com)
7 * Arnd Bergmann (arndb@de.ibm.com)
8 * Martin Schwidefsky (schwidefsky@de.ibm.com)

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651
652#ifdef CONFIG_CCW_CONSOLE
653static struct subchannel console_subchannel;
654static struct io_subchannel_private console_priv;
655static int console_subchannel_in_use;
656
657/*
658 * Use cio_tsch to update the subchannel status and call the interrupt handler
659 * if status had been pending. Called with the console_subchannel lock.
659 * if status had been pending. Called with the subchannel's lock held.
660 */
660 */
661static void cio_tsch(struct subchannel *sch)
661void cio_tsch(struct subchannel *sch)
662{
663 struct irb *irb;
664 int irq_context;
665
666 irb = (struct irb *)&S390_lowcore.irb;
667 /* Store interrupt response block to lowcore. */
668 if (tsch(sch->schid, irb) != 0)
669 /* Not status pending or not operational. */

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685 }
686}
687
688void *cio_get_console_priv(void)
689{
690 return &console_priv;
691}
692
662{
663 struct irb *irb;
664 int irq_context;
665
666 irb = (struct irb *)&S390_lowcore.irb;
667 /* Store interrupt response block to lowcore. */
668 if (tsch(sch->schid, irb) != 0)
669 /* Not status pending or not operational. */

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685 }
686}
687
688void *cio_get_console_priv(void)
689{
690 return &console_priv;
691}
692
693/*
694 * busy wait for the next interrupt on the console
695 */
696void wait_cons_dev(void)
697{
698 if (!console_subchannel_in_use)
699 return;
700
701 while (1) {
702 cio_tsch(&console_subchannel);
703 if (console_subchannel.schib.scsw.cmd.actl == 0)
704 break;
705 udelay_simple(100);
706 }
707}
708
709static int
710cio_test_for_console(struct subchannel_id schid, void *data)
711{
712 if (stsch_err(schid, &console_subchannel.schib) != 0)
713 return -ENXIO;
714 if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) &&
715 console_subchannel.schib.pmcw.dnv &&
716 (console_subchannel.schib.pmcw.dev == console_devno)) {

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694cio_test_for_console(struct subchannel_id schid, void *data)
695{
696 if (stsch_err(schid, &console_subchannel.schib) != 0)
697 return -ENXIO;
698 if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) &&
699 console_subchannel.schib.pmcw.dnv &&
700 (console_subchannel.schib.pmcw.dev == console_devno)) {

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