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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: Petr Cvek <petr.cvek@tul.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Petr Cvek 2008-02-06 01:37:48 -08:00 committed by Linus Torvalds
parent a9000d037d
commit f63fd7e299
1 changed files with 39 additions and 6 deletions
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33
drivers/parport/parport_pc.c
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@ -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