b21dcafea3
The ->smp_init_cpus() function is called very early during boot, at a point where dynamic I/O mappings are not yet possible. However, in the Armada 370/XP implementation of this function, we have to get the number of CPUs. We used to do that by accessing a hardware register, which requires relying on a static I/O mapping set up by ->map_io(). Not only this requires hardcoding a virtual address, but it also prevents us from removing the static I/O mapping. So this commit changes the way used to get the number of CPUs: we now use the Device Tree, which is a representation of the hardware, and provides us the number of available CPUs. This is also more accurate, because it potentially allows to boot the Linux kernel on only a number of CPUs given by the Device Tree, instead of unconditionally on all CPUs. As a consequence, the coherency_get_cpu_count() function becomes no longer used, so we remove it. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
20 lines
543 B
C
20 lines
543 B
C
/*
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* arch/arm/mach-mvebu/include/mach/coherency.h
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*
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*
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* Coherency fabric (Aurora) support for Armada 370 and XP platforms.
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*
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* Copyright (C) 2012 Marvell
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#ifndef __MACH_370_XP_COHERENCY_H
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#define __MACH_370_XP_COHERENCY_H
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int set_cpu_coherent(int cpu_id, int smp_group_id);
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int coherency_init(void);
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#endif /* __MACH_370_XP_COHERENCY_H */
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