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>

1 files changed, 39 insertions, 6 deletions

diff --git a/drivers/parport/parport_pc.c b/drivers/parport/parport_pc.c
index db26b4017bc1..238628d3a854 100644
--- a/drivers/parport/parport_pc.c
+++ b/drivers/parport/parport_pc.c
@@ -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;
 }