netdev - [PATCH 3/4] defxx: Disable DEFEA's ESIC I/O decoding on shutdown

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Date:	Fri, 21 Nov 2014 14:10:02 +0000 (GMT)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	netdev@...r.kernel.org
Subject: [PATCH 3/4] defxx: Disable DEFEA's ESIC I/O decoding on shutdown

Make sure the option card does not respond after shutdown by disabling
it via ESIC's Expansion Board Control register.  Also disable memory and
port I/O decoders, the latter in particular to disable slot-specific I/O
decoding that otherwise remains active even in the board is disabled.

Signed-off-by: Maciej W. Rozycki <macro@...ux-mips.org>
---
linux-defea-bus-uninit.patch
Index: linux-20141025-dolch/drivers/net/fddi/defxx.c
===================================================================
--- linux-20141025-dolch.orig/drivers/net/fddi/defxx.c
+++ linux-20141025-dolch/drivers/net/fddi/defxx.c
@@ -856,6 +856,12 @@ static void dfx_bus_uninit(struct net_de
 		val = inb(base_addr + PI_ESIC_K_IO_CONFIG_STAT_0);
 		val &= ~PI_CONFIG_STAT_0_M_INT_ENB;
 		outb(val, base_addr + PI_ESIC_K_IO_CONFIG_STAT_0);
+
+		/* Disable the board.  */
+		outb(0, base_addr + PI_ESIC_K_SLOT_CNTRL);
+
+		/* Disable memory and port decoders.  */
+		outb(0, base_addr + PI_ESIC_K_FUNCTION_CNTRL);
 	}
 	if (dfx_bus_pci) {
 		/* Disable interrupts at PCI bus interface chip (PFI) */
--
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