LXR linux/arch/arm/mach-bcm/bcm

   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
  19static const char *const bcm5301x_dt_compat[] __initconst = {
  20        "brcm,bcm4708",
  21        NULL,
  22};
  23
  24static 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
  39static 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
  45DT_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,
  50MACHINE_END
  51