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Commit ca4a6f87 authored by Thomas Petazzoni's avatar Thomas Petazzoni Committed by Jason Cooper
Browse files

ARM: mvebu: add workaround for data abort issue on Armada 375 



Early versions of Armada 375 SoC have a bug where the BootROM leaves
an external data abort pending. The kernel is hit by this data abort
as soon as it enters userspace, because it unmasks the data aborts at
this moment. We register a custom abort handler below to ignore the
first data abort to work around this problem.

Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: default avatarJason Cooper <jason@lakedaemon.net>
parent d3ce7f25

arch/arm/mach-mvebu/board-v7.c

+25 −0
Original line number Diff line number Diff line
@@ -31,6 +31,27 @@ 
#include "coherency.h"

#include "mvebu-soc-id.h"



/*

 * Early versions of Armada 375 SoC have a bug where the BootROM

 * leaves an external data abort pending. The kernel is hit by this

 * data abort as soon as it enters userspace, because it unmasks the

 * data aborts at this moment. We register a custom abort handler

 * below to ignore the first data abort to work around this

 * problem.

 */

static int armada_375_external_abort_wa(unsigned long addr, unsigned int fsr,

					struct pt_regs *regs)

{

	static int ignore_first;



	if (!ignore_first && fsr == 0x1406) {

		ignore_first = 1;

		return 0;

	}



	return 1;

}



static void __init mvebu_timer_and_clk_init(void)

{

	of_clk_init(NULL);
@@ -40,6 +61,10 @@ static void __init mvebu_timer_and_clk_init(void) 
#ifdef CONFIG_CACHE_L2X0

	l2x0_of_init(0, ~0UL);

#endif



	if (of_machine_is_compatible("marvell,armada375"))

		hook_fault_code(16 + 6, armada_375_external_abort_wa, SIGBUS, 0,

				"imprecise external abort");

}



static void __init i2c_quirk(void)