parport_pc: detection for SuperIO IT87XX POST
Petr Cvek [Wed, 6 Feb 2008 09:37:48 +0000 (01:37 -0800)]
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>

drivers/parport/parport_pc.c

index db26b40..238628d 100644 (file)
@@ -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)
@@ -3164,24 +3196,25 @@ static void __init parport_pc_find_ports (int autoirq, int autodma)
        int count = 0, err;
 
 #ifdef CONFIG_PARPORT_PC_SUPERIO
-       detect_and_report_winbond ();
-       detect_and_report_smsc ();
+       detect_and_report_it87();
+       detect_and_report_winbond();
+       detect_and_report_smsc();
 #endif
 
        /* Onboard SuperIO chipsets that show themselves on the PCI bus. */
-       count += parport_pc_init_superio (autoirq, autodma);
+       count += parport_pc_init_superio(autoirq, autodma);
 
        /* PnP ports, skip detection if SuperIO already found them */
        if (!count) {
-               err = pnp_register_driver (&parport_pc_pnp_driver);
+               err = pnp_register_driver(&parport_pc_pnp_driver);
                if (!err)
                        pnp_registered_parport = 1;
        }
 
        /* ISA ports and whatever (see asm/parport.h). */
-       parport_pc_find_nonpci_ports (autoirq, autodma);
+       parport_pc_find_nonpci_ports(autoirq, autodma);
 
-       err = pci_register_driver (&parport_pc_pci_driver);
+       err = pci_register_driver(&parport_pc_pci_driver);
        if (!err)
                pci_registered_parport = 1;
 }