arc: Mask individual IRQ lines during core INTC init

ARC cores on reset have all interrupt lines of built-in INTC enabled.
Which means once we globally enable interrupts (very early on boot)
faulty hardware blocks may trigger an interrupt that Linux kernel
cannot handle yet as corresponding handler is not yet installed.

In that case system falls in "interrupt storm" and basically never
does anything useful except entering and exiting generic IRQ handling
code.

One real example of that kind of problematic hardware is DW GMAC which
also has interrupts enabled on reset and if Ethernet PHY informs GMAC
about link state, GMAC immediately reports that upstream to ARC core
and here we are.

Now with that change we mask all individual IRQ lines making entire
system more fool-proof.

[This patch was motivated by Adaptrum platform support]

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Eugeniy Paltsev <paltsev@synopsys.com>
Tested-by: Alexandru Gagniuc <alex.g@adaptrum.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

diff --git a/arch/arc/kernel/intc-arcv2.c b/arch/arc/kernel/intc-arcv2.c
index f928795fd07a813e9f6f3e6d86f325b45561b3dc..cf90714a676d6baabbdc1beb2119fe530e1c84f3 100644 (file)
--- a/arch/arc/kernel/intc-arcv2.c
+++ b/arch/arc/kernel/intc-arcv2.c
@@ -75,10 +75,13 @@ void arc_init_IRQ(void)
         * Set a default priority for all available interrupts to prevent
         * switching of register banks if Fast IRQ and multiple register banks
         * are supported by CPU.
+        * Also disable all IRQ lines so faulty external hardware won't
+        * trigger interrupt that kernel is not ready to handle.
         */
        for (i = NR_EXCEPTIONS; i < irq_bcr.irqs + NR_EXCEPTIONS; i++) {
                write_aux_reg(AUX_IRQ_SELECT, i);
                write_aux_reg(AUX_IRQ_PRIORITY, ARCV2_IRQ_DEF_PRIO);
+               write_aux_reg(AUX_IRQ_ENABLE, 0);
        }
 
        /* setup status32, don't enable intr yet as kernel doesn't want */

diff --git a/arch/arc/kernel/intc-compact.c b/arch/arc/kernel/intc-compact.c
index 7e608c6b0a018697fb22c52c7fb4ac46a45fe2f0..cef388025adf43aed091869f102e01e1bee72092 100644 (file)
--- a/arch/arc/kernel/intc-compact.c
+++ b/arch/arc/kernel/intc-compact.c
@@ -27,7 +27,7 @@
  */
 void arc_init_IRQ(void)
 {
-       int level_mask = 0;
+       int level_mask = 0, i;
 
        /* Is timer high priority Interrupt (Level2 in ARCompact jargon) */
        level_mask |= IS_ENABLED(CONFIG_ARC_COMPACT_IRQ_LEVELS) << TIMER0_IRQ;
@@ -40,6 +40,18 @@ void arc_init_IRQ(void)
 
        if (level_mask)
                pr_info("Level-2 interrupts bitset %x\n", level_mask);
+
+       /*
+        * Disable all IRQ lines so faulty external hardware won't
+        * trigger interrupt that kernel is not ready to handle.
+        */
+       for (i = TIMER0_IRQ; i < NR_CPU_IRQS; i++) {
+               unsigned int ienb;
+
+               ienb = read_aux_reg(AUX_IENABLE);
+               ienb &= ~(1 << i);
+               write_aux_reg(AUX_IENABLE, ienb);
+       }
 }
 
 /*