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