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linux/arch/arm/mach-vexpress/platsmp.c

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ARM: Add Versatile Express SMP support Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-02-12 05:56:07 +08:00
/*
* linux/arch/arm/mach-vexpress/platsmp.c
*
* Copyright (C) 2002 ARM Ltd.
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/smp.h>
#include <linux/io.h>
ARM: vexpress: Simplify SMP operations for DT-powered system As all cores must be properly described in the Device Tree, there is no point in getting their numbers from SCU on A5/A9 platforms. This significantly simplifies the code, removing the need for flat-tree scanning and early static mapping. Signed-off-by: Pawel Moll <pawel.moll@arm.com>
2013-09-18 01:30:58 +08:00
#include <linux/of_address.h>
ARM: vexpress: Start using new Versatile Express infrastructure This patch starts using all the configuration infrastructure. - generic GPIO library is forced now - sysreg GPIOs are used as MMC CD and WP information sources; thanks to this MMCI auxiliary data is not longer necessary - DVI muxer and mode control is removed from non-DT V2P-CA9 code as this is now handled by the vexpress-dvi driver - clock generators control is removed as is being handled by the common clock driver now - the sysreg and sysctl control is now delegated to the appropriate drivers and all related code was removed - NOR Flash set_vpp function has been removed as the control bit used does _not_ control its VPP line, but the #WP signal instead (which is de facto unusable in case of Linux MTD drivers); this also allowed the remove its DT auxiliary data The non-DT code defines only minimal required number of the config devices. Device Trees are updated to make use of all new features. Signed-off-by: Pawel Moll <pawel.moll@arm.com>
2012-10-09 19:56:36 +08:00
#include <linux/vexpress.h>
ARM: vexpress: Use FDT data in platform SMP calls Scan flatten device looking for A5/A9 SCU node and initialize it using base address in "reg" property. If nothing is found, assume that there is no special SCU initialization required and initialize CPUs basing on numbers of "cpu" type devices in "cpus" node of the Device Tree. All this happens only if the board was booted with FDT, otherwise ct_desc callbacks are used. Signed-off-by: Pawel Moll <pawel.moll@arm.com>
2012-02-24 17:18:14 +08:00
ARM: vexpress: Select multi-cluster SMP operation if required Signed-off-by: Jon Medhurst <tixy@linaro.org> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Pawel Moll <pawel.moll@arm.com>
2013-01-30 17:12:55 +08:00
#include <asm/mcpm.h>
ARM: vexpress: Use FDT data in platform SMP calls Scan flatten device looking for A5/A9 SCU node and initialize it using base address in "reg" property. If nothing is found, assume that there is no special SCU initialization required and initialize CPUs basing on numbers of "cpu" type devices in "cpus" node of the Device Tree. All this happens only if the board was booted with FDT, otherwise ct_desc callbacks are used. Signed-off-by: Pawel Moll <pawel.moll@arm.com>
2012-02-24 17:18:14 +08:00
#include <asm/smp_scu.h>
#include <asm/mach/map.h>
ARM: Add Versatile Express SMP support Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-02-12 05:56:07 +08:00
ARM: SoC: convert VExpress/RealView to SMP operations Convert both Realview and VExpress to use struct smp_operations to provide their SMP and CPU hotplug operation. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Nicolas Pitre <nico@fluxnic.net> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2011-09-08 20:15:22 +08:00
#include <plat/platsmp.h>
ARM: Add Versatile Express SMP support Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-02-12 05:56:07 +08:00
ARM: SoC: convert VExpress/RealView to SMP operations Convert both Realview and VExpress to use struct smp_operations to provide their SMP and CPU hotplug operation. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Nicolas Pitre <nico@fluxnic.net> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2011-09-08 20:15:22 +08:00
#include "core.h"
ARM: Fix subtle race in CPU pen_release hotplug code There is a subtle race in the CPU hotplug code, where a CPU which has been offlined can online itself before being requested, which results in things going astray on the next online/offline cycle. What happens in the normal online/offline/online cycle is: CPU0 CPU3 requests boot of CPU3 pen_release = 3 flush cache line checks pen_release, reads 3 starts boot pen_release = -1 ... requests CPU3 offline ... ... dies ... checks pen_release, reads -1 requests boot of CPU3 pen_release = 3 flush cache line checks pen_release, reads 3 starts boot pen_release = -1 However, as the write of -1 of pen_release is not fully flushed back to memory, and the checking of pen_release is done with caches disabled, this allows CPU3 the opportunity to read the old value of pen_release: CPU0 CPU3 requests boot of CPU3 pen_release = 3 flush cache line checks pen_release, reads 3 starts boot pen_release = -1 ... requests CPU3 offline ... ... dies ... checks pen_release, reads 3 starts boot pen_release = -1 requests boot of CPU3 pen_release = 3 flush cache line Fix this by grouping the write of pen_release along with its cache line flushing code to ensure that any update to pen_release is always pushed out to physical memory. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-18 18:53:12 +08:00
ARM: vexpress: Select multi-cluster SMP operation if required Signed-off-by: Jon Medhurst <tixy@linaro.org> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Pawel Moll <pawel.moll@arm.com>
2013-01-30 17:12:55 +08:00
bool __init vexpress_smp_init_ops(void)
{
#ifdef CONFIG_MCPM
ARM: vexpress: refine MCPM smp operations override criteria Current vexpress smp init code detects whether to override the default smp ops with MCPM smp ops by matching the "cci-400" compatible string, in that MCPM requires control over CCI ports to manage low-power states entry/exit. The "cci-400" compatible string check is a necessary but not sufficient condition for MCPM to work, because the cci-400 can be made visible to the kernel, but firmware can nonetheless disable non-secure CCI ports control, while still allowing PMU access; if booted in non-secure world, the kernel would still blindly override smp operations with MCPM operations, resulting in kernel faults when the CCI ports programming interface is accessed from non-secure world. This means that the "cci-400" compatible string check would result in a false positive in systems that eg boot in HYP mode, where CCI ports non-secure access is explicitly not allowed, and it is reported in the respective device tree nodes with CCI ports marked as disabled. Refactor the smp operations initialization to make sure that the kernel is actually allowed to take control over CCI ports (by enabling MCPM smp operations) before overriding default vexpress smp operations. Cc: Liviu Dudau <liviu.dudau@arm.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Nicolas Pitre <nico@linaro.org> Tested-by: Jon Medhurst <tixy@linaro.org> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
2016-09-23 21:09:06 +08:00
int cpu;
struct device_node *cpu_node, *cci_node;
ARM: vexpress: Select multi-cluster SMP operation if required Signed-off-by: Jon Medhurst <tixy@linaro.org> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Pawel Moll <pawel.moll@arm.com>
2013-01-30 17:12:55 +08:00
/*
ARM: vexpress: refine MCPM smp operations override criteria Current vexpress smp init code detects whether to override the default smp ops with MCPM smp ops by matching the "cci-400" compatible string, in that MCPM requires control over CCI ports to manage low-power states entry/exit. The "cci-400" compatible string check is a necessary but not sufficient condition for MCPM to work, because the cci-400 can be made visible to the kernel, but firmware can nonetheless disable non-secure CCI ports control, while still allowing PMU access; if booted in non-secure world, the kernel would still blindly override smp operations with MCPM operations, resulting in kernel faults when the CCI ports programming interface is accessed from non-secure world. This means that the "cci-400" compatible string check would result in a false positive in systems that eg boot in HYP mode, where CCI ports non-secure access is explicitly not allowed, and it is reported in the respective device tree nodes with CCI ports marked as disabled. Refactor the smp operations initialization to make sure that the kernel is actually allowed to take control over CCI ports (by enabling MCPM smp operations) before overriding default vexpress smp operations. Cc: Liviu Dudau <liviu.dudau@arm.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Nicolas Pitre <nico@linaro.org> Tested-by: Jon Medhurst <tixy@linaro.org> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
2016-09-23 21:09:06 +08:00
* The best way to detect a multi-cluster configuration
* is to detect if the kernel can take over CCI ports
* control. Loop over possible CPUs and check if CCI
* port control is available.
ARM: vexpress: Select multi-cluster SMP operation if required Signed-off-by: Jon Medhurst <tixy@linaro.org> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Pawel Moll <pawel.moll@arm.com>
2013-01-30 17:12:55 +08:00
* Override the default vexpress_smp_ops if so.
*/
ARM: vexpress: refine MCPM smp operations override criteria Current vexpress smp init code detects whether to override the default smp ops with MCPM smp ops by matching the "cci-400" compatible string, in that MCPM requires control over CCI ports to manage low-power states entry/exit. The "cci-400" compatible string check is a necessary but not sufficient condition for MCPM to work, because the cci-400 can be made visible to the kernel, but firmware can nonetheless disable non-secure CCI ports control, while still allowing PMU access; if booted in non-secure world, the kernel would still blindly override smp operations with MCPM operations, resulting in kernel faults when the CCI ports programming interface is accessed from non-secure world. This means that the "cci-400" compatible string check would result in a false positive in systems that eg boot in HYP mode, where CCI ports non-secure access is explicitly not allowed, and it is reported in the respective device tree nodes with CCI ports marked as disabled. Refactor the smp operations initialization to make sure that the kernel is actually allowed to take control over CCI ports (by enabling MCPM smp operations) before overriding default vexpress smp operations. Cc: Liviu Dudau <liviu.dudau@arm.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Nicolas Pitre <nico@linaro.org> Tested-by: Jon Medhurst <tixy@linaro.org> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
2016-09-23 21:09:06 +08:00
for_each_possible_cpu(cpu) {
bool available;
cpu_node = of_get_cpu_node(cpu, NULL);
if (WARN(!cpu_node, "Missing cpu device node!"))
return false;
cci_node = of_parse_phandle(cpu_node, "cci-control-port", 0);
available = cci_node && of_device_is_available(cci_node);
of_node_put(cci_node);
of_node_put(cpu_node);
if (!available)
return false;
ARM: vexpress: Select multi-cluster SMP operation if required Signed-off-by: Jon Medhurst <tixy@linaro.org> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Pawel Moll <pawel.moll@arm.com>
2013-01-30 17:12:55 +08:00
}
ARM: vexpress: refine MCPM smp operations override criteria Current vexpress smp init code detects whether to override the default smp ops with MCPM smp ops by matching the "cci-400" compatible string, in that MCPM requires control over CCI ports to manage low-power states entry/exit. The "cci-400" compatible string check is a necessary but not sufficient condition for MCPM to work, because the cci-400 can be made visible to the kernel, but firmware can nonetheless disable non-secure CCI ports control, while still allowing PMU access; if booted in non-secure world, the kernel would still blindly override smp operations with MCPM operations, resulting in kernel faults when the CCI ports programming interface is accessed from non-secure world. This means that the "cci-400" compatible string check would result in a false positive in systems that eg boot in HYP mode, where CCI ports non-secure access is explicitly not allowed, and it is reported in the respective device tree nodes with CCI ports marked as disabled. Refactor the smp operations initialization to make sure that the kernel is actually allowed to take control over CCI ports (by enabling MCPM smp operations) before overriding default vexpress smp operations. Cc: Liviu Dudau <liviu.dudau@arm.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Nicolas Pitre <nico@linaro.org> Tested-by: Jon Medhurst <tixy@linaro.org> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
2016-09-23 21:09:06 +08:00
mcpm_smp_set_ops();
return true;
#else
ARM: vexpress: Select multi-cluster SMP operation if required Signed-off-by: Jon Medhurst <tixy@linaro.org> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Pawel Moll <pawel.moll@arm.com>
2013-01-30 17:12:55 +08:00
return false;
ARM: vexpress: refine MCPM smp operations override criteria Current vexpress smp init code detects whether to override the default smp ops with MCPM smp ops by matching the "cci-400" compatible string, in that MCPM requires control over CCI ports to manage low-power states entry/exit. The "cci-400" compatible string check is a necessary but not sufficient condition for MCPM to work, because the cci-400 can be made visible to the kernel, but firmware can nonetheless disable non-secure CCI ports control, while still allowing PMU access; if booted in non-secure world, the kernel would still blindly override smp operations with MCPM operations, resulting in kernel faults when the CCI ports programming interface is accessed from non-secure world. This means that the "cci-400" compatible string check would result in a false positive in systems that eg boot in HYP mode, where CCI ports non-secure access is explicitly not allowed, and it is reported in the respective device tree nodes with CCI ports marked as disabled. Refactor the smp operations initialization to make sure that the kernel is actually allowed to take control over CCI ports (by enabling MCPM smp operations) before overriding default vexpress smp operations. Cc: Liviu Dudau <liviu.dudau@arm.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Nicolas Pitre <nico@linaro.org> Tested-by: Jon Medhurst <tixy@linaro.org> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
2016-09-23 21:09:06 +08:00
#endif
ARM: vexpress: Select multi-cluster SMP operation if required Signed-off-by: Jon Medhurst <tixy@linaro.org> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Pawel Moll <pawel.moll@arm.com>
2013-01-30 17:12:55 +08:00
}
ARM: vexpress: Simplify SMP operations for DT-powered system As all cores must be properly described in the Device Tree, there is no point in getting their numbers from SCU on A5/A9 platforms. This significantly simplifies the code, removing the need for flat-tree scanning and early static mapping. Signed-off-by: Pawel Moll <pawel.moll@arm.com>
2013-09-18 01:30:58 +08:00
static const struct of_device_id vexpress_smp_dt_scu_match[] __initconst = {
{ .compatible = "arm,cortex-a5-scu", },
{ .compatible = "arm,cortex-a9-scu", },
{}
};
static void __init vexpress_smp_dt_prepare_cpus(unsigned int max_cpus)
{
struct device_node *scu = of_find_matching_node(NULL,
vexpress_smp_dt_scu_match);
if (scu)
scu_enable(of_iomap(scu, 0));
/*
* Write the address of secondary startup into the
* system-wide flags register. The boot monitor waits
* until it receives a soft interrupt, and then the
* secondary CPU branches to this address.
*/
ARM: 8641/1: treewide: Replace uses of virt_to_phys with __pa_symbol All low-level PM/SMP code using virt_to_phys() should actually use __pa_symbol() against kernel symbols. Update code where relevant to move away from virt_to_phys(). Acked-by: Russell King <rmk+kernel@armlinux.org.uk> Reviewed-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2017-01-15 10:59:29 +08:00
vexpress_flags_set(__pa_symbol(versatile_secondary_startup));
ARM: vexpress: Simplify SMP operations for DT-powered system As all cores must be properly described in the Device Tree, there is no point in getting their numbers from SCU on A5/A9 platforms. This significantly simplifies the code, removing the need for flat-tree scanning and early static mapping. Signed-off-by: Pawel Moll <pawel.moll@arm.com>
2013-09-18 01:30:58 +08:00
}
ARM: use const and __initconst for smp_operations These smp_operations structures are not over-written, so add "const" qualifier and replace __initdata with __initconst. Also, add "static" where it is possible. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by: Moritz Fischer <moritz.fischer@ettus.com> Acked-by: Stephen Boyd <sboyd@codeaurora.org> # qcom part Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Patrice Chotard <patrice.chotard@st.com> Acked-by: Heiko Stuebner <heiko@sntech.de> Acked-by: Wei Xu <xuwei5@hisilicon.com> Acked-by: Florian Fainelli <f.fainelli@gmail.com> Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Acked-by: Shawn Guo <shawnguo@kernel.org> Acked-by: Matthias Brugger <matthias.bgg@gmail.com> Acked-by: Thierry Reding <treding@nvidia.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Liviu Dudau <Liviu.Dudau@arm.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2015-11-15 09:39:53 +08:00
const struct smp_operations vexpress_smp_dt_ops __initconst = {
ARM: vexpress: Simplify SMP operations for DT-powered system As all cores must be properly described in the Device Tree, there is no point in getting their numbers from SCU on A5/A9 platforms. This significantly simplifies the code, removing the need for flat-tree scanning and early static mapping. Signed-off-by: Pawel Moll <pawel.moll@arm.com>
2013-09-18 01:30:58 +08:00
.smp_prepare_cpus = vexpress_smp_dt_prepare_cpus,
.smp_secondary_init = versatile_secondary_init,
.smp_boot_secondary = versatile_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
.cpu_die = vexpress_cpu_die,
#endif
};