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
  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 == 0x1406 || fsr == 0x1c06) && first_fault) {
  22                 first_fault = false;
  23
  24                 /*
  25                  * These faults with codes 0x1406 (BCM4709) or 0x1c06 happens
  26                  * for no good reason, possibly left over from the CFE boot
  27                  * loader.
  28                  */
  29                 pr_warn("External imprecise Data abort at addr=%#lx, fsr=%#x ignored.\n",
  30                         addr, fsr);
  31
  32                 /* Returning non-zero causes fault display and panic */
  33                 return 0;
  34         }
  35
  36         /* Others should cause a fault */
  37         return 1;
  38 }
  39
  40 static void __init bcm5301x_init_early(void)
  41 {
  42         /* Install our hook */
  43         hook_fault_code(16 + 6, bcm5301x_abort_handler, SIGBUS, BUS_OBJERR,
  44                         "imprecise external abort");
  45 }
  46
  47 static const char *const bcm5301x_dt_compat[] __initconst = {
  48         "brcm,bcm4708",
  49         NULL,
  50 };
  51
  52 DT_MACHINE_START(BCM5301X, "BCM5301X")
  53         .l2c_aux_val    = 0,
  54         .l2c_aux_mask   = ~0,
  55         .init_early     = bcm5301x_init_early,
  56         .dt_compat      = bcm5301x_dt_compat,
  57 MACHINE_END