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+/*
+ * Low-level IRQ helper macros
+ *
+ * Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <mach/hardware.h>
+#include <asm/hardware/gic.h>
+
+ .macro disable_fiq
+ .endm
+
+ .macro get_irqnr_preamble, base, tmp
+ ldr \base, =gic_cpu_base_addr
+ ldr \base, [\base]
+ .endm
+
+ .macro arch_ret_to_user, tmp1, tmp2
+ .endm
+
+ /*
+ * The interrupt numbering scheme is defined in the
+ * interrupt controller spec. To wit:
+ *
+ * Migrated the code from ARM MP port to be more consistant
+ * with interrupt processing , the following still holds true
+ * however, all interrupts are treated the same regardless of
+ * if they are local IPI or PPI
+ *
+ * Interrupts 0-15 are IPI
+ * 16-31 are PPI
+ * (16-18 are the timers)
+ * 32-1020 are global
+ * 1021-1022 are reserved
+ * 1023 is "spurious" (no interrupt)
+ *
+ * A simple read from the controller will tell us the number of the
+ * highest priority enabled interrupt. We then just need to check
+ * whether it is in the valid range for an IRQ (0-1020 inclusive).
+ *
+ * Base ARM code assumes that the local (private) peripheral interrupts
+ * are not valid, we treat them differently, in that the privates are
+ * handled like normal shared interrupts with the exception that only
+ * one processor can register the interrupt and the handler must be
+ * the same for all processors.
+ */
+
+ .macro get_irqnr_and_base, irqnr, irqstat, base, tmp
+
+ ldr \irqstat, [\base, #GIC_CPU_INTACK] /* bits 12-10 =srcCPU,
+ 9-0 =int # */
+
+ bic \irqnr, \irqstat, #0x1c00 @mask src
+ cmp \irqnr, #15
+ ldr \tmp, =1021
+ cmpcc \irqnr, \irqnr
+ cmpne \irqnr, \tmp
+ cmpcs \irqnr, \irqnr
+
+ .endm
+
+ /* We assume that irqstat (the raw value of the IRQ acknowledge
+ * register) is preserved from the macro above.
+ * If there is an IPI, we immediately signal end of interrupt on the
+ * controller, since this requires the original irqstat value which
+ * we won't easily be able to recreate later.
+ */
+ .macro test_for_ipi, irqnr, irqstat, base, tmp
+ bic \irqnr, \irqstat, #0x1c00
+ cmp \irqnr, #16
+ strcc \irqstat, [\base, #GIC_CPU_EOI]
+ cmpcs \irqnr, \irqnr
+ .endm
+
+ /* As above, this assumes that irqstat and base are preserved.. */
+
+ .macro test_for_ltirq, irqnr, irqstat, base, tmp
+ bic \irqnr, \irqstat, #0x1c00
+ mov \tmp, #0
+ cmp \irqnr, #16
+ moveq \tmp, #1
+ streq \irqstat, [\base, #GIC_CPU_EOI]
+ cmp \tmp, #0
+ .endm
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