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
19 static const char *const bcm5301x_dt_compat[] __initconst = {
20 "brcm,bcm4708",
21 NULL,
22 };
23
bcm5301x_abort_handler(unsigned long addr,unsigned int fsr,struct pt_regs * regs)24 static 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
bcm5301x_init_early(void)39 static 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
45 DT_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,
50 MACHINE_END
51