Merge branch 'address-masking'
[linux-2.6-microblaze.git] / arch / arm / mach-bcm / bcm_5301x.c
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
17 static const char *const bcm5301x_dt_compat[] __initconst = {
18         "brcm,bcm4708",
19         NULL,
20 };
21
22 static 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
37 static 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
43 DT_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,
48 MACHINE_END