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>
63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/*
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* arch/arm/mach-tegra/reset.h
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*
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* CPU reset dispatcher.
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*
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* Copyright (c) 2011, NVIDIA Corporation.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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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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*/
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#ifndef __MACH_TEGRA_RESET_H
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#define __MACH_TEGRA_RESET_H
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#define TEGRA_RESET_MASK_PRESENT 0
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#define TEGRA_RESET_MASK_LP1 1
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#define TEGRA_RESET_MASK_LP2 2
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#define TEGRA_RESET_STARTUP_SECONDARY 3
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#define TEGRA_RESET_STARTUP_LP2 4
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#define TEGRA_RESET_STARTUP_LP1 5
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#define TEGRA_RESET_DATA_SIZE 6
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#ifndef __ASSEMBLY__
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#include "irammap.h"
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extern unsigned long __tegra_cpu_reset_handler_data[TEGRA_RESET_DATA_SIZE];
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void __tegra_cpu_reset_handler_start(void);
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void __tegra_cpu_reset_handler(void);
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void __tegra_cpu_reset_handler_end(void);
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#ifdef CONFIG_PM_SLEEP
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#define tegra_cpu_lp1_mask \
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(IO_ADDRESS(TEGRA_IRAM_BASE + TEGRA_IRAM_RESET_HANDLER_OFFSET + \
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((u32)&__tegra_cpu_reset_handler_data[TEGRA_RESET_MASK_LP1] - \
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(u32)__tegra_cpu_reset_handler_start)))
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#define tegra_cpu_lp2_mask \
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(IO_ADDRESS(TEGRA_IRAM_BASE + TEGRA_IRAM_RESET_HANDLER_OFFSET + \
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((u32)&__tegra_cpu_reset_handler_data[TEGRA_RESET_MASK_LP2] - \
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(u32)__tegra_cpu_reset_handler_start)))
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#endif
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#define tegra_cpu_reset_handler_offset \
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((u32)__tegra_cpu_reset_handler - \
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(u32)__tegra_cpu_reset_handler_start)
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#define tegra_cpu_reset_handler_size \
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(__tegra_cpu_reset_handler_end - \
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__tegra_cpu_reset_handler_start)
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void __init tegra_cpu_reset_handler_init(void);
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#endif
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#endif
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