ARM: OMAP2+: Add custom abort handler for t410

Similar to commit fdf4850cb5b2 ("ARM: BCM5301X: workaround suppress fault"),
let's add custom handling for the aborts on t410 that prevent booting:

Unhandled fault: imprecise external abort (0xc06) at 0xee091fb0
pgd = ee4bc000
[ee091fb0] *pgd=ae00041e(bad)
Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000007

Cc: Matthijs van Duin <matthijsvanduin@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/mach-omap2/pdata-quirks.c b/arch/arm/mach-omap2/pdata-quirks.c
index 4e655ae..1e9917c 100644 (file)
--- a/arch/arm/mach-omap2/pdata-quirks.c
+++ b/arch/arm/mach-omap2/pdata-quirks.c
@@ -24,6 +24,9 @@
 #include <linux/platform_data/iommu-omap.h>
 #include <linux/platform_data/wkup_m3.h>
 
+#include <asm/siginfo.h>
+#include <asm/signal.h>
+
 #include "common.h"
 #include "common-board-devices.h"
 #include "dss-common.h"
@@ -382,6 +385,29 @@ static void __init omap3_pandora_legacy_init(void)
 }
 #endif /* CONFIG_ARCH_OMAP3 */
 
+#ifdef CONFIG_SOC_TI81XX
+static int fault_fixed_up;
+
+static int t410_abort_handler(unsigned long addr, unsigned int fsr,
+                             struct pt_regs *regs)
+{
+       if ((fsr == 0x406 || fsr == 0xc06) && !fault_fixed_up) {
+               pr_warn("External imprecise Data abort at addr=%#lx, fsr=%#x ignored.\n",
+                       addr, fsr);
+               fault_fixed_up = 1;
+               return 0;
+       }
+
+       return 1;
+}
+
+static void __init t410_abort_init(void)
+{
+       hook_fault_code(16 + 6, t410_abort_handler, SIGBUS, BUS_OBJERR,
+                       "imprecise external abort");
+}
+#endif
+
 #if defined(CONFIG_ARCH_OMAP4) || defined(CONFIG_SOC_OMAP5)
 static struct iommu_platform_data omap4_iommu_pdata = {
        .reset_name = "mmu_cache",
@@ -510,6 +536,9 @@ static struct pdata_init pdata_quirks[] __initdata = {
        { "openpandora,omap3-pandora-600mhz", omap3_pandora_legacy_init, },
        { "openpandora,omap3-pandora-1ghz", omap3_pandora_legacy_init, },
 #endif
+#ifdef CONFIG_SOC_TI81XX
+       { "hp,t410", t410_abort_init, },
+#endif
 #ifdef CONFIG_SOC_OMAP5
        { "ti,omap5-uevm", omap5_uevm_legacy_init, },
 #endif