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 16 static bool first_fault = true; 17 18 static int bcm5301x_abort_handler(unsigned long addr, unsigned int fsr, 19 struct pt_regs *regs) 20 { 21 if (fsr == 0x1c06 && first_fault) { 22 first_fault = false; 23 24 /* 25 * These faults with code 0x1c06 happens for no good reason, 26 * possibly left over from the CFE boot loader. 27 */ 28 pr_warn("External imprecise Data abort at addr=%#lx, fsr=%#x ignored.\n", 29 addr, fsr); 30 31 /* Returning non-zero causes fault display and panic */ 32 return 0; 33 } 34 35 /* Others should cause a fault */ 36 return 1; 37 } 38 39 static void __init bcm5301x_init_early(void) 40 { 41 /* Install our hook */ 42 hook_fault_code(16 + 6, bcm5301x_abort_handler, SIGBUS, BUS_OBJERR, 43 "imprecise external abort"); 44 } 45 46 static const char __initconst *bcm5301x_dt_compat[] = { 47 "brcm,bcm4708", 48 NULL, 49 }; 50 51 DT_MACHINE_START(BCM5301X, "BCM5301X") 52 .l2c_aux_val = 0, 53 .l2c_aux_mask = ~0, 54 .init_early = bcm5301x_init_early, 55 .dt_compat = bcm5301x_dt_compat, 56 MACHINE_END 57