- 22 May, 2014 6 commits
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Thomas Petazzoni authored
In the refactoring of the coherency fabric assembly code, a function called ll_get_cpuid() was created to factorize common logic between functions adding CPU to the SMP coherency group, enabling and disabling the coherency. However, the name of the function is highly misleading: ll_get_cpuid() makes one think tat it returns the ID of the CPU, i.e 0 for CPU0, 1 for CPU1, etc. In fact, this is not at all what this function returns: it returns a CPU mask for the current CPU, usable for the coherency fabric configuration and control registers. Therefore this commit renames this function to ll_get_coherency_cpumask(), and adds additional comments on top of the function to explain in more details what it does, and also how the endianess issue is handled. Signed-off-by:
Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Link: https://lkml.kernel.org/r/1400762882-10116-5-git-send-email-thomas.petazzoni@free-electrons.comAcked-by:
Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by:
Jason Cooper <jason@lakedaemon.net>
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Thomas Petazzoni authored
This commit makes no functional change, it only improves a bit the various code comments in mach-mvebu/coherency_ll.S, by fixing a few typos and adding a few more details. Signed-off-by:
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Thomas Petazzoni authored
This commit does not make any functional change, it only fixes the indentation of a few assembly instructions in arch/arm/mach-mvebu/coherency_ll.S. Signed-off-by:
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Thomas Petazzoni authored
As part of the introduction of the cpuidle support for Armada XP, the coherency code was significantly reworked, especially in the coherency_ll.S file. However, when the ll_get_cpuid function was created, the big-endian specific code that switches the endianess of the register was not updated properly. This patch fixes this code, and therefore makes big endian systems bootable again. Signed-off-by:
Kevin Hilman <khilman@linaro.org> Cc: Kevin Hilman <khilman@linaro.org> Acked-by:
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Thomas Petazzoni authored
Commit b0063aad ("ARM: mvebu: use hardware I/O coherency also for PCI devices") added a reference to the pci_bus_type variable, but this variable is only available when CONFIG_PCI is enabled. Therefore, there is now a build failure in !CONFIG_PCI situations. This commit fixes that by enclosing the entire initcall into a IS_ENABLED(CONFIG_PCI) condition. Reported-by:
Arnd Bergmann <arnd@arndb.de> Signed-off-by:
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Thomas Petazzoni authored
The Marvell Armada 375 and Armada 38x SOCs, which use the Cortex-A9 CPU core, the PL310 cache and the Marvell PCIe hardware block are affected a L2/PCIe deadlock caused by a system erratum when hardware I/O coherency is used. This deadlock can be avoided by mapping the PCIe memory areas as strongly-ordered (note: MT_UNCACHED is strongly-ordered), and by removing the outer cache sync done in software. This is implemented in this patch by: * Registering a custom arch_ioremap_caller function that allows to make sure PCI memory regions are mapped MT_UNCACHED. * Adding at runtime the 'arm,io-coherent' property to the PL310 cache controller. This cannot be done permanently in the DT, because the hardware I/O coherency can only be enabled when CONFIG_SMP is enabled, in the current kernel situation. Signed-off-by:
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- 16 May, 2014 1 commit
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Thomas Petazzoni authored
Since the beginning of the introduction of hardware I/O coherency support for Armada 370 and Armada XP, the special DMA operations should have applied to all DMA capable devices. Unfortunately, while the original code properly took into account platform devices, it didn't take into account PCI devices, which can also be DMA masters. This commit fixes that by registering a bus notifier on pci_bus_type, to register our custom DMA operations, like is already done for platform devices. While doing this, we also rename mvebu_hwcc_platform_notifier() to mvebu_hwcc_notifier() and mvebu_hwcc_platform_nb to mvebu_hwcc_nb because they are no longer specific to platform devices. Signed-off-by:
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- 08 May, 2014 33 commits
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Vincent Stehlé authored
When compiling for multiplatform for both ARMv6 and ARMv7, the default compiler flags are for ARMv6, and we will get: /tmp/ccwDEzd0.s: Assembler messages: /tmp/ccwDEzd0.s:639: Error: selected processor does not support ARM mode `isb ' /tmp/ccwDEzd0.s:645: Error: selected processor does not support ARM mode `isb ' /tmp/ccwDEzd0.s:646: Error: selected processor does not support ARM mode `dsb ' /tmp/ccwDEzd0.s:695: Error: selected processor does not support ARM mode `isb ' make[1]: *** [arch/arm/mach-mvebu/pmsu.o] Error 1 Fix this in a similar manner than done previously in commit 72533b77, by specifying ARMv7 flags for pmsu.o. Signed-off-by:
Vincent Stehlé <vincent.stehle@laposte.net> Link: https://lkml.kernel.org/r/1399407782-29091-1-git-send-email-vincent.stehle@laposte.net Cc: Jason Cooper <jason@lakedaemon.net> Cc: Andrew Lunn <andrew@lunn.ch> Cc: Gregory Clement <gregory.clement@free-electrons.com> Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Cc: Russell King <linux@arm.linux.org.uk> Signed-off-by:
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Thomas Petazzoni authored
The Armada 375 coherency workaround only needs to be applied to the Z1 revision of the SoC. The A0 and later revisions have been fixed, and no longer need this workaround. Signed-off-by:
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Thomas Petazzoni authored
The Armada 375 SMP workaround only needs to be applied to the Z1 revision of the SoC. The A0 and later revisions have been fixed, and no longer need this workaround. Note that the initialization of the SMP workaround is delayed from ->smp_prepare_cpus() to ->smp_boot_secondary() because when ->smp_prepare_cpus() is called, the early initcalls have not be called, so the mvebu-soc-id mechanism is not operational. Since the workaround is anyway not needed before the secondary CPU is started, we can delay its implementation until the ->smp_boot_secondary() call. Signed-off-by:
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Thomas Petazzoni authored
Now that we have access to Armada 375 A0 platforms, we can add the corresponding revision definition in mvebu-soc-id.h. Signed-off-by:
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Thomas Petazzoni authored
Currently, the mvebu-soc-id logic is initialized through a core_initcall(). However, we will soon need to know the SoC revision before booting secondary CPUs, because a workaround affects Armada 375 Z1 steppings, but should not be applied on Armada 375 A0 steppings. Unfortunately, core_initcall() are called way too late compared to the SMP initialization. Therefore, the mvebu-soc-id initialization is move to an early_initcall(), which is called before the SMP initialization. Signed-off-by:
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Thomas Petazzoni authored
In commit 54fe26a900bc528f3df1e4235cb6b9ca5c6d4dc2 ('ARM: mvebu: Add thermal quirk for the Armada 375 DB board'), a check on the Armada SoC revision was added to decide whether a quirk for the thermal device should be applied or not. However, the quirk implementation has a bug: it assumes mvebu_get_soc_id() returns true on success, but it returns 0. Therefore, the condition: if (mvebu_get_soc_id(&dev, &rev) && rev > ARMADA_375_Z1_REV) is always false (as long as mvebu-soc-id is properly initialized). As a consequence, the quirk is always applied, even on A0 steppings, for which the quirk should not be applied. This was spotted by testing the thermal driver on Armada 375 A0, which Ezequiel could not do since he does not have access to the A0 revision of the SoC for the moment. Signed-off-by:Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Signed-off-by:
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Andrew Lunn authored
Remove platform device instantiating of the audio, which results in board-t5325.c being removed. A DT node will be added to take its place. Signed-off-by:
Andrew Lunn <andrew@lunn.ch> Link: https://lkml.kernel.org/r/1399141819-23924-7-git-send-email-andrew@lunn.chSigned-off-by:
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Andrew Lunn authored
Remove the platform driver and platform data for the audio codec. A DT node will replace it. Signed-off-by:
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Ezequiel Garcia authored
The initial release of the Armada 375 DB board has an Armada 375 Z1 stepping silicon. This commit introduces a quirk that allows to workaround a series of issues with the thermal sensor in this stepping, but updating the devicetree: * Updates the compatible string for the thermal, so the driver can perform a specific initialization of the sensor. * Moves the offset of the thermal control register. This quirk allows to specifiy the correct (A0 stepping) offset in the devicetree. Signed-off-by: -
Ezequiel Garcia authored
HAVE_ARM_TWD depends on SMP, so we should only select it if SMP is enabled, as the others platforms do. Signed-off-by:
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Gregory CLEMENT authored
The name of the two parameters of mvebu_get_soc_id were inverted. This patch fix it in order to have a more readable code. Reported-by:
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Gregory CLEMENT authored
l2x0_of_init function is always defined arch/arm/include/asm/hardware/cache-l2x0.h: in case of CONFIG_CACHE_L2X0 is not selected then a placeholder is defined. Then there is no need to have ifdef around l2x0_of_init. Signed-off-by:
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Gregory CLEMENT authored
The cpuidle is a platform driver so we register the device just after the initialization of the board in an arch_initcall. Signed-off-by:
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Gregory CLEMENT authored
Add the wfi, cpu idle and cpu deep idle power states support for the Armada XP SoCs. All the latencies and the power consumption values used at the "armada_370_xp_idle_driver" structure are preliminary and will be modified in the future after running some measurements and analysis. Based on the work of Nadav Haklai. Signed-off-by:
Nadav Haklai <nadavh@marvell.com> Link: https://lkml.kernel.org/r/1397488214-20685-11-git-send-email-gregory.clement@free-electrons.comSigned-off-by:
Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by:
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Gregory CLEMENT authored
In order to have well encapsulated code, we use notifier callbacks for CPU_PM_ENTER and CPU_PM_EXIT inside the mvebu power management code. Signed-off-by:
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Thomas Petazzoni authored
Following the integration into mach-mvebu of the Kirkwood ARMv5 support, we need to be more careful about which files get built. For example, the pmsu.c file now calls wfi(), which only exists on ARMv7 platforms. Therefore, this commit changes mach-mvebu/Makefile to build the Armada 370/XP/375/38x specific files only when CONFIG_MACH_MVEBU_V7 is enabled. Signed-off-by:
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Gregory CLEMENT authored
The cpu idle support will need to access to Power Management Service Unit. This commit adds the architecture related functions that will be used in the idle path of the cpuidle driver. Signed-off-by:
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Gregory CLEMENT authored
This commit adds a function which adjusts the PMSU configuration to automatically power down the L2 and coherency fabric when we enter a certain idle state. This feature is part of the Power Management Service Unit of the Armada 370 and Armada XP SoCs. Signed-off-by:
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Gregory CLEMENT authored
When going to deep idle we need to disable the SoC snooping (aka hardware coherency support). Playing with the coherency fabric requires to use assembly code to be sure that the compiler doesn't reorder the instructions nor do wrong optimization. Signed-off-by:
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Gregory CLEMENT authored
Actually enabling coherency and adding a CPU on a SMP group are two different operations which can be done separately. This patch splits this in two functions. Moreover as they use common pattern, this patch also creates local low level functions (ll_get_coherency_base and ll_get_cpuid) to be used by the exposed functions (ll_add_cpu_to_smp_group and ll_enable_coherency) Signed-off-by:
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Gregory CLEMENT authored
set_cpu_coherent() took the SMP group ID as parameter. But this parameter was never used, and the CPU always uses the SMP group 0. So we can remove this parameter. Signed-off-by:
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Gregory CLEMENT authored
ll_set_cpu_coherent is always used on the current CPU, so instead of passing the CPU id as argument, ll_set_cpu_coherent() can find it by itself. Signed-off-by:
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Gregory CLEMENT authored
In order to be able to deal with the MMU enabled and the MMU disabled cases, the base address of the coherency registers was passed to the function. The address by itself was not interesting as it can't change for a given SoC, the only thing we need is to have a distinction between the physical or the virtual address. This patch add a check of the MMU bit to choose the accurate address, then the calling function doesn't have to pass this information. Signed-off-by:
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Thomas Petazzoni authored
Since the Armada 38x PMSU registers are slightly different than the Armada 370/XP PMSU ones, we introduce a new compatible string "armada-380-pmsu" in the PMSU driver. These differences are not visible for the current usage of the PMSU, but they might become visible in the future. Signed-off-by:
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Gregory CLEMENT authored
Due to internal bootrom issue, CPU[1] initial jump code (four instructions) should be placed in SRAM memory of the SoC. In order to achieve this, we have to unmap the BootROM and at some specific location where the BootROM was place, create a specific MBus window for the SRAM. This SRAM is initialized with a few instructions of code that allows to jump into the real secondary CPU boot address. This workaround will most likely be disabled when newer steppings of the Armada 375 will be made available, in which case a dynamic test based on mvebu-soc-id will be added. Signed-off-by:
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Gregory CLEMENT authored
This commit adds the SMP support for Armada 375 and Armada 38x. It turns out that the SMP logic for both of these SOCs are fairly similar, the only differences being: * A different method to set the secondary CPU boot address * An Armada 375 specific workaround needed for the early Z1 stepping, added by the following patch. Other than that, the patch is fairly straightforward and adds the usual platsmp and headsmp code, defining the smp_operations structure that is referenced from the DT_MACHINE structures. Signed-off-by:
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Gregory CLEMENT authored
In order to boot the secondary CPUs on Armada 375, we need to set the boot address of these CPUs, through a register part of the System Controller (this deviates from the Armada XP design, where the boot address was defined using a register part of the PMSU unit). Therefore, this commit adds a new helper function in the System Controller driver to set the secondary CPU boot address. Moreover, it moves the System Controller initialization as an early_initcall(), since arch_initcall() is too late for an SMP-related initialization. Signed-off-by:
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Jason Cooper authored
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Thomas Petazzoni authored
This commit adds the CPU_METHOD_OF_DECLARE declaration for the Armada XP SMP operations. Note that the .smp_ops field of Armada XP DT_MACHINE structure is kept, in order to ensure we remain compatible with older Device Trees that do not include the "enable-method" property for the CPUs. Signed-off-by:
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Thomas Petazzoni authored
The pmsu.c driver contained an armada_xp_boot_cpu() function that sets the boot address of a secondary CPUs and deasserts the reset. However, the Armada 375 needs a slightly different logic, so it makes more sense to move this code into the Armada XP specific platsmp.c. In order to achieve this, the mvebu_pmsu_set_cpu_boot_addr() function is exported. It will be needed for both the Armada XP and Armada 38x SMP implementations. Signed-off-by:
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Jason Cooper authored
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Sebastian Hesselbarth authored
Non-DT irq handlers were working through irq causes from most-significant to least-significant bit, while DT irqchip driver does it the other way round. This revealed some more HW issues on Kirkwood peripheral IP, where spurious sdio irqs can happen although irqs are masked. Also, the generated binaries show that original non-DT order compared to DT order save two instructions for each bit count check: irqchip DT order with ffs(): 60: e3a06001 mov r6, #1 64: e2643000 rsb r3, r4, #0 68: e0033004 and r3, r3, r4 6c: e16f3f13 clz r3, r3 70: e263301f rsb r3, r3, #31 74: e1c44316 bic r4, r4, r6, lsl r3 78: e5971004 ldr r1, [r7, #4] Original non-DT order with fls(): 60: e3a07001 mov r7, #1 64: e16f3f14 clz r3, r4 68: e263301f rsb r3, r3, #31 6c: e1c44317 bic r4, r4, r7, lsl r3 70: e5951004 ldr r1, [r5, #4] Therefore, reverse irq bit handling back to original order by replacing ffs() with fls(). Signed-off-by:
Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Link: https://lkml.kernel.org/r/1398719528-23607-1-git-send-email-sebastian.hesselbarth@gmail.comAcked-by:
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Thomas Petazzoni authored
Some irqchip initialization must be done on secondary CPUs. On mvebu platforms, this is currently achieved by having the arch/arm/mach-mvebu/platsmp.c code directly call into a function exported by the irqchip driver, which isn't really nice. This commit changes this by using the same solution as the one used in the GIC driver: the irqchip driver registers a CPU notifier, which is used to do the secondary CPU IRQ initialization. This way, the irqchip driver is completely autonomous, and the function no longer needs to be exposed from the irqchip driver to the SoC code. Signed-off-by:
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