arch/arm/mach-bcm/bcm_5301x.c

   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