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>
53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/*
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* This file contains common function prototypes to avoid externs
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* in the c files.
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*
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* Copyright (C) 2011 Xilinx
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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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#ifndef __MACH_ZYNQ_COMMON_H__
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#define __MACH_ZYNQ_COMMON_H__
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extern int zynq_slcr_init(void);
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extern int zynq_early_slcr_init(void);
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extern void zynq_slcr_system_reset(void);
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extern void zynq_slcr_cpu_stop(int cpu);
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extern void zynq_slcr_cpu_start(int cpu);
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extern bool zynq_slcr_cpu_state_read(int cpu);
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extern void zynq_slcr_cpu_state_write(int cpu, bool die);
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extern u32 zynq_slcr_get_device_id(void);
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#ifdef CONFIG_SMP
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extern char zynq_secondary_trampoline;
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extern char zynq_secondary_trampoline_jump;
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extern char zynq_secondary_trampoline_end;
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extern int zynq_cpun_start(u32 address, int cpu);
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extern struct smp_operations zynq_smp_ops __initdata;
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#endif
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extern void __iomem *zynq_scu_base;
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void zynq_pm_late_init(void);
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static inline void zynq_core_pm_init(void)
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{
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/* A9 clock gating */
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asm volatile ("mrc p15, 0, r12, c15, c0, 0\n"
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"orr r12, r12, #1\n"
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"mcr p15, 0, r12, c15, c0, 0\n"
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: /* no outputs */
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: /* no inputs */
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: "r12");
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}
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#endif
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