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 #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