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 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 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