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#include <linux/of_platform.h>
9#include <asm/hardware/cache-l2x0.h>
10
11#include <asm/mach/arch.h>
12#include <asm/siginfo.h>
13#include <asm/signal.h>
14
15#define FSR_EXTERNAL		(1 << 12)
16#define FSR_READ		(0 << 10)
17#define FSR_IMPRECISE		0x0406
18
19static const char *const bcm5301x_dt_compat[] __initconst = {
20	"brcm,bcm4708",
21	NULL,
22};
23
24static int bcm5301x_abort_handler(unsigned long addr, unsigned int fsr,
25				  struct pt_regs *regs)
26{
27	/*
28	 * We want to ignore aborts forwarded from the PCIe bus that are
29	 * expected and shouldn't really be passed by the PCIe controller.
30	 * The biggest disadvantage is the same FSR code may be reported when
31	 * reading non-existing APB register and we shouldn't ignore that.
32	 */
33	if (fsr == (FSR_EXTERNAL | FSR_READ | FSR_IMPRECISE))
34		return 0;
35
36	return 1;
37}
38
39static void __init bcm5301x_init_early(void)
40{
41	hook_fault_code(16 + 6, bcm5301x_abort_handler, SIGBUS, BUS_OBJERR,
42			"imprecise external abort");
43}
44
45DT_MACHINE_START(BCM5301X, "BCM5301X")
46	.l2c_aux_val	= 0,
47	.l2c_aux_mask	= ~0,
48	.dt_compat	= bcm5301x_dt_compat,
49	.init_early	= bcm5301x_init_early,
50MACHINE_END
51