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2013-02-28arm: mvebu: Enable USB controllers on Armada 370/XP boardsEzequiel Garcia
This patch activates every USB port provided by each SoC. Except for Armada XP Openblocks AX3-4 board, where we enable only the first two USB ports until we have more information on the third one usage. Cc: Lior Amsalem <alior@marvell.com> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Gregory CLEMENT <gregory.clement@free-electrons.com> Tested-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org> Tested-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: Add support for USB host controllers in Armada 370/XPEzequiel Garcia
The Armada 370 and Armada XP SoC has an Orion EHCI USB controller. This patch adds support for this controller in Armada 370 and Armada XP SoC common device tree files. Cc: Lior Amsalem <alior@marvell.com> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Tested-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org> Tested-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: add button for OpenBlocks AX3-4Thomas Petazzoni
The OpenBlocks AX3-4 board has one software-controlled button on the front side, labeled "INIT", so we add minimal support for this button in the kernel. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28ARM: Kirkwood: Convert NS2 to gpio-poweroff.Andrew Lunn
Remove C code and add a Device Tree node in its place. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Tested-by: Simon Guinot <simon.guinot@sequanux.org> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28ARM: Kirkwood: Convert NSA310 I2C to device treeAndrew Lunn
Add a sub-node into the I2C node to represent the adt7476 device. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28ARM: Kirkwood: Convert NSA310 to use gpio-poweroff driverAndrew Lunn
Remove the C code and add a Device Tree node for gpio-poweroff. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28ARM: Kirkwood: Convert NSA310 to DT based regulators.Andrew Lunn
Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28ARM: Dove: add fixed regulator for CuBox USB powerSebastian Hesselbarth
CuBox needs to enable USB power on a gpio pin. Add a fixed regulator to always enable usb power on boot. Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28ARM: Dove: move CuBox led pinctrl to gpio-leds nodeSebastian Hesselbarth
gpio-leds has support for pinctrl allocation, make use of it. Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28ARM: Kirkwood: Convert openblocks A6 board to pinctrlNobuhiro Iwamatsu
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28ARM: Kirkwood: Add pinctrl of NAND to 88f6282Nobuhiro Iwamatsu
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28ARM: Kirkwood: Add pinctrl of TWSI1 to 88f6282Nobuhiro Iwamatsu
The 88f6282 has one more TWSI(TWSI1). This add the information to enable pinctl of TWSI1. Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org> Acked-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: kirkwood: add pinmux option for the SDIO interface on 88F6282Thomas Petazzoni
This commit adds a pinmux option, pmx_sdio, to enable the muxing of the SDIO interface on the 88F6282 SoC from Marvell. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: kirkwood: mplcec4: use Device Tree to probe SDIOThomas Petazzoni
Now that the mvsdio driver has a Device Tree binding, and the SDIO controller is declared in kirkwood.dtsi, migrate the mplcec4 board to use the Device Tree to probe the SDIO controller and to mux the pins of the SDIO interface correctly. This patch has not been tested, it remains to be tested by a person having access to the hardware. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Stefan Peter <s.peter@mpl.ch> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: kirkwood: dreamplug: use Device Tree to probe SDIOThomas Petazzoni
Now that the mvsdio driver has a Device Tree binding, and the SDIO controller is declared in kirkwood.dtsi, migrate the dreamplug board to use the Device Tree to probe the SDIO controller and to mux this interface properly. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Jason Cooper <jason@lakedaemon.net> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: kirkwood: add Device Tree informations for the SDIO controllerThomas Petazzoni
Now that the SDIO controller has a Device Tree binding, let's use it in kirkwood.dtsi. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: enable the SDIO interface on the Globalscale MiraboxThomas Petazzoni
The Globalscale Mirabox uses the SDIO interface of the Armada 370 to connect to a Wifi/Bluetooth SD8787 chip, so we enable the SDIO interface of this board in its Device Tree file. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: enable the SD card slot on Armada 370 DB boardThomas Petazzoni
The Armada XP DB evaluation board has one SD card slot, directly connected to the SDIO IP of the SoC, so we add a device tree description for it. However, in the default configuration of the board, the SD card slot is not usable: the connector plugged into CON40 must be changed against a different one, provided with the board by the manufacturer. Since such a manual modification of the hardware is needed, we did not enable the SDIO interface by default, and left it to the board user to modify the Device Tree if needed. Since this board is really only an evaluation board for developers and not a final product, it is not too bad. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: enable the SD card slot on Armada XP DB boardThomas Petazzoni
The Armada XP DB evaluation board has one SD card slot, directly connected to the SDIO IP of the SoC, so we enable this IP. Unfortunately, there are no GPIOs for card-detect and write-protect. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: add pin muxing options for the SDIO interface on Armada XPThomas Petazzoni
The SDIO interface is only available on pins MPP30/31/32/33/34/35 on the various Armada XP variants, so we provide a pin muxing option for this in the Armada XP .dtsi files. Even though those muxing options are the same for MV78230, MV78260 and MV78460, we keep them in each .dtsi file, because the number of pins, and therefore the declaration of the pinctrl node, is different for each SoC variant. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: add pin muxing options for the SDIO interface on Armada 370Thomas Petazzoni
The SDIO interface is available either on pins MPP9/11/12/13/14/15 or MPP47/48/49/50/51/52 on the Armada 370. Even though all combinations are potentially possible, those two muxing options are the most probable ones, so we provide those at the SoC level .dtsi file. In practice, in turns out the Armada 370 DB board uses the former, while the Armada 370 Mirabox uses the latter. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: add DT information for the SDIO interface of Armada 370/XPThomas Petazzoni
Now that the mvsdio MMC driver has a Device Tree binding, we add the Device Tree informations to describe the SDIO interface available in the Armada 370/XP SoCs. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: Add RTC support for Armada 370 and Armada XPGregory CLEMENT
The Armada 370 and Armada XP Socs have the same controller that the one used in the orion platforms. This patch updates the device tree for these SoCs. Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Acked-by: Andrew Lunn <andrew@lunn.ch> Tested-by: Florian Fainelli <florian@openwrt.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: update defconfig with ATAG support when using DTGregory CLEMENT
Some of the mvebu boards (mainly the development board) come with plug-in RAM modules. This patch allows to let the bootloaders which have no support for DTS to give the real amount of memory available on the board. Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28ARM: mvebu: Update defconfig to select SPI flash and MTD supportEzequiel Garcia
The Armada XP DB-MV784MP-GP board has an SPI flash device. These options allow to access that device over MTD. Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28ARM: mvebu: Update defconfig to select SPI supportEzequiel Garcia
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Lior Amsalem <alior@marvell.com> Acked-by: Gregory Clement <gregory.clement@free-electrons.com> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: support for the new Armada XP development board(DB-MV784MP-GP)Gregory CLEMENT
This is the new Armada XP evaluation board from Marvell. It comes with a RS232 port over USB, a SATA link, an internal SSD, 4 Ethernet Gigabit links. Support for USB (Host and device), SDIO, PCIe will be added as drivers when they become available for Armada XP in mainline. Tested-by: Simon Guinot <simon.guinot@sequanux.org> Tested-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Tested-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: update defconfig with local timer supportGregory CLEMENT
Now that we have support for local timers, enable it by default Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: Add support for local interruptGregory CLEMENT
MPIC allows the use of private interrupt for each CPUs. The 28th first interrupts are per-cpu. This patch adds support to use them. Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: Update defconfig to select USB supportEzequiel Garcia
Cc: Lior Amsalem <alior@marvell.com> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Gregory CLEMENT <gregory.clement@free-electrons.com> Tested-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org> Tested-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28ARM: kirkwood: convert Guruplug Server Plus to use the device treeWilly Tarreau
Add a device tree entry for the Guruplug Server Plus board. This port was based both on the work done on the dreamplug and the dockstar. It builds, boots and works on my Guruplug Server Plus. Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: add DTS file for Marvell RD-A370-A1 boardFlorian Fainelli
This patch adds the DTS file to support the Marvell RD-A370-A1 (Reference Design board) also known as RD-88F6710 board. It is almost entirely similar to the DB-A370 board except that the first Ethernet PHY is SGMII-wired and the second is a switch which is RGMII-wired. Signed-off-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: Improve the SMP support of the interrupt controllerGregory CLEMENT
This patch makes the interrupt controller driver more SMP aware for the Armada XP SoCs. It adds the support for the per-CPU irq. It also adds the implementation for the set_affinity hook. Patch initialy wrote by Yehuda Yitschak and reworked by Gregory CLEMENT. Signed-off-by: Yehuda Yitschak <yehuday@marvell.com> Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28ARM: Dove: split legacy and DT setupArnd Bergmann
In the beginning of DT for Dove it was reasonable to have it close to non-DT code. With improved DT support, it became more and more difficult to not break non-DT while changing DT code. This patch splits up DT board setup and introduces a DOVE_LEGACY config to allow to remove legacy code for DT-only kernels. Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28ARM: dove: update dove_defconfig with a few useful optionsOlof Johansson
This refreshes the dove_defconfig, and adds: PRINTK_TIME DEVTMPFS EXT4 They're quite useful, and allows booting a cubox ubuntu rootfs on SD card, since that by default uses ext4. The rest of the churn is due to options and defaults moving around, no functional difference. Signed-off-by: Olof Johansson <olof@lixom.net> Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28ARM: Kirkwood: Remove redundent SDIO clock aliasAndrew Lunn
Now that SDIO is instantiated via DT, and the SDIO DT node has a clocks property, we no longer need a C coded clock alias. Remove it. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28ARM: Kirkwood: Remove redundent USB clock aliasAndrew Lunn
Now that USB is instantiated via DT, and the USB DT node has a clocks property, we no longer need a C coded clock alias. Remove it. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: add LEDs support to defconfig fileThomas Petazzoni
The OpenBlocks AX3-4 platform has several LEDs, so it sounds wise to enable LED support in mvebu_defconfig. We anticipate that more platforms using Marvell EBU SoCs will have LEDs in the future. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: enable btmrvl driver in mvebu_defconfigThomas Petazzoni
The Globalscale Mirabox platform, based on the Armada 370 from Marvell, has a SD8787 Wireless/Bluetooth chip connected on the SDIO interface. Now that the mvsdio has a Device Tree binding, and the necessary Device Tree informations have been added at the SoC and board level, let's enable the btmrvl driver for the Bluetooth part of the SD8787 chip. For now, the driver gets probed correctly, detects the device but apparently fails to push the firmware to the device: Bluetooth: vendor=0x2df, device=0x911a, class=255, fn=2 Bluetooth: FW failed to be active in time! Bluetooth: Downloading firmware failed! Bluetooth: vendor=0x2df, device=0x911b, class=255, fn=3 Bluetooth: FW failed to be active in time! Bluetooth: Downloading firmware failed! This will have to be investigated separately. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: enable mwifiex driver in mvebu_defconfigThomas Petazzoni
The Globalscale Mirabox platform, based on the Armada 370 from Marvell, has a SD8787 Wireless chip connected on the SDIO interface. Now that the mvsdio has a Device Tree binding, and the necessary Device Tree informations have been added at the SoC and board level, let's enable the mwifiex driver for the Wireless part of the SD8787 chip. For now, the driver gets probed correctly, detects a device and shows the network interfaces. However, scanning Wifi networks doesn't work for now, with a 'CMD_RESP: cmd 0x6 error, result=0x1' message. This will have to be investigated separately. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: enable SDIO support in mvebu_defconfigThomas Petazzoni
Now that the mvsdio driver has gained Device Tree support and the necessary Device Tree informations has been added for Armada 370 and Armada XP platforms, we enable the MMC subsystem and the mvsdio driver in mvebu_defconfig. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28arm: mvebu: Update defconfig with Marvell RTC supportGregory CLEMENT
The RTC class driver is already part of the mvebu_defconfig but the Marvell internal RTC not yet. Now that its support is added for mvebu let's update the config file. Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Tested-by: Florian Fainelli <florian@openwrt.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-02-28Merge branch 'timer/cleanup' into late/mvebu2Arnd Bergmann
Basing the mvebu patches on top of the timer cleanup avoids some nasty merges. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2013-02-28Merge 'mmc/upstream' into late/mvebu2Arnd Bergmann
These patches from the mmc tree were merged into v3.9 already and the later mvebu patches depend on them. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2013-02-01Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linusLinus Torvalds
Pull MIPS updates from Ralf Baechle: "A number of fixes all across the MIPS tree. No area is particularly standing out and things have cooled down quite nicely for a release." * 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: MIPS: Function tracer: Fix broken function tracing mips: Move __virt_addr_valid() to a place for MIPS 64 MIPS: Netlogic: Fix UP compilation on XLR MIPS: AR71xx: Fix AR71XX_PCI_MEM_SIZE MIPS: AR724x: Fix AR724X_PCI_MEM_SIZE MIPS: Lantiq: Fix cp0_perfcount_irq mapping MIPS: DSP: Fix DSP mask for registers. MIPS: Fix build failure by adding definition of pfn_pmd(). MIPS: Octeon: Fix warning. MIPS: delay.c: Check BITS_PER_LONG instead of __SIZEOF_LONG__ MIPS: PNX833x: Fix comment. MIPS: Add struct p_format to union mips_instruction. MIPS: Export <asm/break.h>. MIPS: BCM47xx: Enable SSB prerequisite SSB_DRIVER_PCICORE. MIPS: BCM47xx: Select GPIOLIB for BCMA on bcm47xx platform MIPS: vpe.c: Fix null pointer dereference in print arguments.
2013-01-31Merge tag 'tags/drivers_for_v3.9' into mvebu/boardsJason Cooper
mvebu drivers for v3.9 - use rtc-mv in mvebu armv7 SoCs - add pci-e hotplug for kirkwood Depends on: - tags/mvebu_fixes_for_v3.8-rc6
2013-01-31Merge tag 'tags/cleanup_for_v3.9_round2' into mvebu/boardsJason Cooper
cleanup for v3.9 round2 - remove unneeded #includes for mach-dove - remove unneeded #includes and code for the nsa310
2013-01-31Merge tag 'tags/mvebu_fixes_for_v3.8-rc6' into mvebu/boardsJason Cooper
fixes for v3.8-rc6 - add missing gpio interrupt lines to dove dt - fix bad logic for printing MPP error message on orion boards - build proper serial port driver after changing mvebu DT compatible property - This is a change to mvebu_defconfig that I wouldn't usually push out as a fix. However, the commit b24212f arm: mvebu: Use dw-apb-uart instead of ns16650 as UART driver changed the serial driver for the board in the dts file. without the patch I've included in this pull, users won't see any log messages.
2013-01-31cpuidle: kirkwood: Move out of mach directoryAndrew Lunn
Move the Kirkwood cpuidle driver out of arch/arm/mach-kirkwood and into drivers/cpuidle. Convert the driver into a platform driver. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-01-31MIPS: Function tracer: Fix broken function tracingAl Cooper
Function tracing is currently broken for all 32 bit MIPS platforms. When tracing is enabled, the kernel immediately hangs on boot. This is a result of commit b732d439cb43336cd6d7e804ecb2c81193ef63b0 that changes the kernel/trace/Kconfig file so that is no longer forces FRAME_POINTER when FUNCTION_TRACING is enabled. MIPS frame pointers are generally considered to be useless because they cannot be used to unwind the stack. Unfortunately the MIPS function tracing code has bugs that are masked by the use of frame pointers. This commit fixes the bugs so that MIPS frame pointers don't need to be enabled. The bugs are a result of the odd calling sequence used to call the trace routine. This calling sequence is inserted into every traceable function when the tracing CONFIG option is enabled. This sequence is generated for 32bit MIPS platforms by the compiler via the "-pg" flag. Part of the sequence is "addiu sp,sp,-8" in the delay slot after every call to the trace routine "_mcount" (some legacy thing where 2 arguments used to be pushed on the stack). The _mcount routine is expected to adjust the sp by +8 before returning. So when not disabled, the original jalr and addiu will be there, so _mcount has to adjust sp. The problem is that when tracing is disabled for a function, the "jalr _mcount" instruction is replaced with a nop, but the "addiu sp,sp,-8" is still executed and the stack pointer is left trashed. When frame pointers are enabled the problem is masked because any access to the stack is done through the frame pointer and the stack pointer is restored from the frame pointer when the function returns. This patch writes two nops starting at the address of the "jalr _mcount" instruction whenever tracing is disabled. This means that the "addiu sp,sp.-8" will be converted to a nop along with the "jalr". When disabled, there will be two nops. This is SMP safe because the first time this happens is during ftrace_init() which is before any other processor has been started. Subsequent calls to enable/disable tracing when other CPUs ARE running will still be safe because the enable will only change the first nop to a "jalr" and the disable, while writing 2 nops, will only be changing the "jalr". This patch also stops using stop_machine() to call the tracer enable/disable routines and calls them directly because the routines are SMP safe. When the kernel first boots we have to be able to handle the gcc generated jalr, addui sequence until ftrace_init gets a chance to run and change the sequence. At this point mcount just adjusts the stack and returns. When ftrace_init runs, we convert the jalr/addui to nops. Then whenever tracing is enabled we convert the first nop to a "jalr mcount+8". The mcount+8 entry point skips the stack adjust. [ralf@linux-mips.org: Folded in Steven Rostedt's build fix.] Signed-off-by: Al Cooper <alcooperx@gmail.com> Cc: rostedt@goodmis.org Cc: ddaney.cavm@gmail.com Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/4806/ Patchwork: https://patchwork.linux-mips.org/patch/4841/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>