02b4e2756e
All ARMv5 and older CPUs invalidate their caches in the early assembly setup function, prior to enabling the MMU. This is because the L1 cache should not contain any data relevant to the execution of the kernel at this point; all data should have been flushed out to memory. This requirement should also be true for ARMv6 and ARMv7 CPUs - indeed, these typically do not search their caches when caching is disabled (as it needs to be when the MMU is disabled) so this change should be safe. ARMv7 allows there to be CPUs which search their caches while caching is disabled, and it's permitted that the cache is uninitialised at boot; for these, the architecture reference manual requires that an implementation specific code sequence is used immediately after reset to ensure that the cache is placed into a sane state. Such functionality is definitely outside the remit of the Linux kernel, and must be done by the SoC's firmware before _any_ CPU gets to the Linux kernel. Changing the data cache clean+invalidate to a mere invalidate allows us to get rid of a lot of platform specific hacks around this issue for their secondary CPU bringup paths - some of which were buggy. Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Tested-by: Florian Fainelli <f.fainelli@gmail.com> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Dinh Nguyen <dinguyen@opensource.altera.com> Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Tested-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Acked-by: Shawn Guo <shawn.guo@linaro.org> Tested-by: Thierry Reding <treding@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> Tested-by: Michal Simek <michal.simek@xilinx.com> Tested-by: Wei Xu <xuwei5@hisilicon.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
/*
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* Copyright 2012 Pavel Machek <pavel@denx.de>
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* Copyright (C) 2012 Altera Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __MACH_CORE_H
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#define __MACH_CORE_H
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#define SOCFPGA_RSTMGR_CTRL 0x04
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#define SOCFPGA_RSTMGR_MODMPURST 0x10
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#define SOCFPGA_RSTMGR_MODPERRST 0x14
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#define SOCFPGA_RSTMGR_BRGMODRST 0x1c
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/* System Manager bits */
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#define RSTMGR_CTRL_SWCOLDRSTREQ 0x1 /* Cold Reset */
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#define RSTMGR_CTRL_SWWARMRSTREQ 0x2 /* Warm Reset */
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#define RSTMGR_MPUMODRST_CPU1 0x2 /* CPU1 Reset */
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extern void __iomem *socfpga_scu_base_addr;
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extern void socfpga_init_clocks(void);
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extern void socfpga_sysmgr_init(void);
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extern void __iomem *sys_manager_base_addr;
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extern void __iomem *rst_manager_base_addr;
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extern struct smp_operations socfpga_smp_ops;
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extern char secondary_trampoline, secondary_trampoline_end;
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extern unsigned long socfpga_cpu1start_addr;
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#define SOCFPGA_SCU_VIRT_BASE 0xfee00000
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#endif
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