summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-tegra/include/mach/entry-macro.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-tegra/include/mach/entry-macro.S')
-rw-r--r--arch/arm/mach-tegra/include/mach/entry-macro.S118
1 files changed, 118 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/include/mach/entry-macro.S b/arch/arm/mach-tegra/include/mach/entry-macro.S
new file mode 100644
index 000000000000..2ba9e5c9d2f6
--- /dev/null
+++ b/arch/arm/mach-tegra/include/mach/entry-macro.S
@@ -0,0 +1,118 @@
+/* arch/arm/mach-tegra/include/mach/entry-macro.S
+ *
+ * Copyright (C) 2009 Palm, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <mach/iomap.h>
+#include <mach/io.h>
+
+#if defined(CONFIG_ARM_GIC)
+
+#include <asm/hardware/gic.h>
+
+ /* Uses the GIC interrupt controller built into the cpu */
+#define ICTRL_BASE (IO_CPU_VIRT + 0x100)
+
+ .macro disable_fiq
+ .endm
+
+ .macro get_irqnr_preamble, base, tmp
+ movw \base, #(ICTRL_BASE & 0x0000ffff)
+ movt \base, #((ICTRL_BASE & 0xffff0000) >> 16)
+ .endm
+
+ .macro arch_ret_to_user, tmp1, tmp2
+ .endm
+
+ /*
+ * The interrupt numbering scheme is defined in the
+ * interrupt controller spec. To wit:
+ *
+ * Interrupts 0-15 are IPI
+ * 16-28 are reserved
+ * 29-31 are local. We allow 30 to be used for the watchdog.
+ * 32-1020 are global
+ * 1021-1022 are reserved
+ * 1023 is "spurious" (no interrupt)
+ *
+ * For now, we ignore all local interrupts so only return an interrupt
+ * if it's between 30 and 1020. The test_for_ipi routine below will
+ * pick up on IPIs.
+ *
+ * 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 (30-1020 inclusive).
+ */
+
+ .macro get_irqnr_and_base, irqnr, irqstat, base, tmp
+
+ /* bits 12-10 = src CPU, 9-0 = int # */
+ ldr \irqstat, [\base, #GIC_CPU_INTACK]
+
+ ldr \tmp, =1021
+
+ bic \irqnr, \irqstat, #0x1c00
+
+ cmp \irqnr, #29
+ 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, #29
+ moveq \tmp, #1
+ streq \irqstat, [\base, #GIC_CPU_EOI]
+ cmp \tmp, #0
+ .endm
+
+#else
+ /* legacy interrupt controller for AP16 */
+ .macro disable_fiq
+ .endm
+
+ .macro get_irqnr_preamble, base, tmp
+ @ enable imprecise aborts
+ cpsie a
+ @ EVP base at 0xf010f000
+ mov \base, #0xf0000000
+ orr \base, #0x00100000
+ orr \base, #0x0000f000
+ .endm
+
+ .macro arch_ret_to_user, tmp1, tmp2
+ .endm
+
+ .macro get_irqnr_and_base, irqnr, irqstat, base, tmp
+ ldr \irqnr, [\base, #0x20] @ EVT_IRQ_STS
+ cmp \irqnr, #0x80
+ .endm
+#endif
OpenPOWER on IntegriCloud