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 49