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
bcm5301x_abort_handler(unsigned long addr,unsigned int fsr,struct pt_regs * regs)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
bcm5301x_init_early(void)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
49