1/*
2 * Broadcom BCM470X / BCM5301X ARM platform code.
3 *
4 * Copyright 2013 Hauke Mehrtens <hauke@hauke-m.de>
5 *
6 * Licensed under the GNU/GPL. See COPYING for details.
7 */
8
9#include <asm/mach/arch.h>
10#include <asm/siginfo.h>
11#include <asm/signal.h>
12
13#define FSR_EXTERNAL		(1 << 12)
14#define FSR_READ		(0 << 10)
15#define FSR_IMPRECISE		0x0406
16
17static const char *const bcm5301x_dt_compat[] __initconst = {
18	"brcm,bcm4708",
19	NULL,
20};
21
22static int bcm5301x_abort_handler(unsigned long addr, unsigned int fsr,
23				  struct pt_regs *regs)
24{
25	/*
26	 * We want to ignore aborts forwarded from the PCIe bus that are
27	 * expected and shouldn't really be passed by the PCIe controller.
28	 * The biggest disadvantage is the same FSR code may be reported when
29	 * reading non-existing APB register and we shouldn't ignore that.
30	 */
31	if (fsr == (FSR_EXTERNAL | FSR_READ | FSR_IMPRECISE))
32		return 0;
33
34	return 1;
35}
36
37static void __init bcm5301x_init_early(void)
38{
39	hook_fault_code(16 + 6, bcm5301x_abort_handler, SIGBUS, BUS_OBJERR,
40			"imprecise external abort");
41}
42
43DT_MACHINE_START(BCM5301X, "BCM5301X")
44	.l2c_aux_val	= 0,
45	.l2c_aux_mask	= ~0,
46	.dt_compat	= bcm5301x_dt_compat,
47	.init_early	= bcm5301x_init_early,
48MACHINE_END
49