From 161d1907607a5a562a152058c8daf1780ce7a00b Mon Sep 17 00:00:00 2001 From: Magnus Damm Date: Tue, 16 Nov 2010 00:48:07 +0100 Subject: ARM: 6475/1: Introduce asm/hardware/entry-macro-gic.S This patch is the identical GIC demux implementation merge V3. Instead of implementing same code over and over simply share it in entry-macro-gic.S. The shared code is based on the realview implementation. Each GIC demux instance still has to setup the base address of the controller using the get_irqnr_preamble macro. The rest of the GIC specific code can be shared. Signed-off-by: Magnus Damm Acked-by: Srinidhi Kasagar Signed-off-by: Russell King --- arch/arm/include/asm/hardware/entry-macro-gic.S | 68 +++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 arch/arm/include/asm/hardware/entry-macro-gic.S (limited to 'arch/arm/include/asm/hardware/entry-macro-gic.S') diff --git a/arch/arm/include/asm/hardware/entry-macro-gic.S b/arch/arm/include/asm/hardware/entry-macro-gic.S new file mode 100644 index 000000000000..05587f125a13 --- /dev/null +++ b/arch/arm/include/asm/hardware/entry-macro-gic.S @@ -0,0 +1,68 @@ +/* + * arch/arm/include/asm/hardware/entry-macro-gic.S + * + * Low-level IRQ helper macros for GIC + * + * 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 + +/* + * 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 + + ldr \irqstat, [\base, #GIC_CPU_INTACK] + /* bits 12-10 = src CPU, 9-0 = int # */ + + 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 -- cgit v1.2.1 From 7627dc802a98aebebc6a34e5b6558ea4717c968c Mon Sep 17 00:00:00 2001 From: Russell King Date: Sun, 5 Dec 2010 08:51:38 +0000 Subject: ARM: GIC: private a standard get_irqnr_preamble assembler macro Provide a standard get_irqnr_preamble assembler macro for platforms to use, which retrieves the base address of the GIC CPU interface from gic_cpu_base_addr. Allow platforms to override this by defining HAVE_GET_IRQNR_PREAMBLE. Reviewed-by: Catalin Marinas Tested-by: Abhijeet Dharmapurikar Signed-off-by: Russell King --- arch/arm/include/asm/hardware/entry-macro-gic.S | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'arch/arm/include/asm/hardware/entry-macro-gic.S') diff --git a/arch/arm/include/asm/hardware/entry-macro-gic.S b/arch/arm/include/asm/hardware/entry-macro-gic.S index 05587f125a13..c115b82fe80a 100644 --- a/arch/arm/include/asm/hardware/entry-macro-gic.S +++ b/arch/arm/include/asm/hardware/entry-macro-gic.S @@ -10,6 +10,13 @@ #include +#ifndef HAVE_GET_IRQNR_PREAMBLE + .macro get_irqnr_preamble, base, tmp + ldr \base, =gic_cpu_base_addr + ldr \base, [\base] + .endm +#endif + /* * The interrupt numbering scheme is defined in the * interrupt controller spec. To wit: -- cgit v1.2.1