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Commit f63fd7e2 authored by Petr Cvek's avatar Petr Cvek Committed by Linus Torvalds
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parport_pc: detection for SuperIO IT87XX POST 



Add detection for IT87XX SuperIO chip and disabling its POST feature, which
made noise on parallel port's pins.

Signed-off-by: default avatarPetr Cvek <petr.cvek@tul.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent a9000d03

drivers/parport/parport_pc.c

+39 −6
Original line number Diff line number Diff line
@@ -1540,6 +1540,38 @@ static void __devinit detect_and_report_smsc (void) 
	smsc_check(0x3f0,0x44);

	smsc_check(0x370,0x44);

}



static void __devinit detect_and_report_it87(void)

{

	u16 dev;

	u8 r;

	if (verbose_probing)

		printk(KERN_DEBUG "IT8705 Super-IO detection, now testing port 2E ...\n");

	if (!request_region(0x2e, 1, __FUNCTION__))

		return;

	outb(0x87, 0x2e);

	outb(0x01, 0x2e);

	outb(0x55, 0x2e);

	outb(0x55, 0x2e);

	outb(0x20, 0x2e);

	dev = inb(0x2f) << 8;

	outb(0x21, 0x2e);

	dev |= inb(0x2f);

	if (dev == 0x8712 || dev == 0x8705 || dev == 0x8715 ||

	    dev == 0x8716 || dev == 0x8718 || dev == 0x8726) {

		printk(KERN_INFO "IT%04X SuperIO detected.\n", dev);

		outb(0x07, 0x2E);	/* Parallel Port */

		outb(0x03, 0x2F);

		outb(0xF0, 0x2E);	/* BOOT 0x80 off */

		r = inb(0x2f);

		outb(0xF0, 0x2E);

		outb(r | 8, 0x2F);

		outb(0x02, 0x2E);	/* Lock */

		outb(0x02, 0x2F);



		release_region(0x2e, 1);

	}

}

#endif /* CONFIG_PARPORT_PC_SUPERIO */



static int get_superio_dma (struct parport *p)
@@ -3164,6 +3196,7 @@ static void __init parport_pc_find_ports (int autoirq, int autodma) 
	int count = 0, err;



#ifdef CONFIG_PARPORT_PC_SUPERIO

	detect_and_report_it87();

	detect_and_report_winbond();

	detect_and_report_smsc();

#endif