Peter Maydell f9b71fef12 ARM: PCI: versatile: Fix map_irq function to match hardware ... The PCI controller code for the Versatile board has never had the correct IRQ mapping for hardware. For many years it had an odd mapping ("all interrupts are int 27") which aligned with the equivalent bug in QEMU. However as of commit 1bc39ac5da the mapping changed and no longer matched either hardware or QEMU, with the result that any PCI card beyond the first in QEMU would not have functioning interrupts; for example a boot with a SCSI controller would time out as follows: ------------ sym0: <895a> rev 0x0 at pci 0000:00:0d.0 irq 92 sym0: SCSI BUS has been reset. scsi0 : sym-2.2.3 [...] scsi 0:0:0:0: ABORT operation started scsi 0:0:0:0: ABORT operation timed-out. scsi 0:0:0:0: DEVICE RESET operation started scsi 0:0:0:0: DEVICE RESET operation timed-out. scsi 0:0:0:0: BUS RESET operation started scsi 0:0:0:0: BUS RESET operation timed-out. scsi 0:0:0:0: HOST RESET operation started sym0: SCSI BUS has been reset ------------ Fix the mapping so that it matches real hardware (checked against the schematics for PB926 and backplane, and tested against the hardware). This allows PCI cards using interrupts to work on hardware for the first time; this change will also work with QEMU 1.5 or later, where the equivalent bugs in the modelling of the hardware have been fixed. Although QEMU will attempt to autodetect whether the kernel is expecting the long-standing "everything is int 27" mapping or the one hardware has, for certainty we force it into "definitely behave like hardware mode"; this will avoid unexpected surprises later if we implement sparse irqs. This is harmless on hardware. Thanks to Paul Gortmaker for bisecting the problem and finding an initial solution, to Russell King for providing the correct interrupt mapping, and to Guenter Roeck for providing an initial version of this patch and prodding me into relocating the hardware and retesting everything. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Cc: stable@vger.kernel.org Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Kevin Hilman <khilman@linaro.org>		2013-09-04 14:52:52 -07:00
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include/mach	The series cleans up ARCH_HAS_DECOMP_WDOG and arch_decomp_wdog which	2013-02-05 10:26:20 -08:00
core.c	reboot: arm: change reboot_mode to use enum reboot_mode	2013-07-09 10:33:29 -07:00
core.h	reboot: arm: change reboot_mode to use enum reboot_mode	2013-07-09 10:33:29 -07:00
Kconfig	ARM: pick Versatile by default for !MMU	2013-02-14 15:04:38 +01:00
Makefile	arm/versatile: Add device tree support	2011-07-28 01:32:04 -06:00
Makefile.boot	ARM: 7022/1: allow to detect conflicting zreladdrs	2011-10-17 09:12:40 +01:00
pci.c	ARM: PCI: versatile: Fix map_irq function to match hardware	2013-09-04 14:52:52 -07:00
versatile_ab.c	Initial irqchip init infrastructure and GIC and VIC clean-ups	2013-01-14 19:55:03 -08:00
versatile_dt.c	ARM: versatile: use OF init for sp804 timer	2013-04-11 15:11:21 -05:00
versatile_pb.c	Initial irqchip init infrastructure and GIC and VIC clean-ups	2013-01-14 19:55:03 -08:00