BMC/Intel-BMC/linux.git/arch/mips/mti-malta, branch dev

MIPS: Export get_c0_perfcount_int()

2015-08-03T07:25:18+00:00

get_c0_perfcount_int is tested from oprofile code. If oprofile is compiled as module, get_c0_perfcount_int needs to be exported, otherwise it cannot be resolved. Fixes: a669efc4a3b4 ("MIPS: Add hook to get C0 performance counter interrupt") Cc: stable@vger.kernel.org # v3.19+ Signed-off-by: Felix Fietkau Cc: linux-mips@linux-mips.org Cc: abrestic@chromium.org Patchwork: https://patchwork.linux-mips.org/patch/10763/ Signed-off-by: Ralf Baechle

MIPS: SMP: Don't increment irq_count multiple times for call function IPIs

2015-08-03T07:25:12+00:00

The majority of SMP platforms handle their IPIs through do_IRQ() which calls irq_{enter/exit}(). When a call function IPI is received, smp_call_function_interrupt() is called which also calls irq_{enter,exit}(), meaning irq_count is raised twice. When tick broadcasting is used (which is implemented via a call function IPI), this incorrectly causes all CPU idle time on the core receiving broadcast ticks to be accounted as time spent servicing IRQs, as account_process_tick() will account as such if irq_count is greater than 1. This results in 100% CPU usage being reported on a core which receives its ticks via broadcast. This patch removes the SMP smp_call_function_interrupt() wrapper which calls irq_{enter,exit}(). Platforms which handle their IPIs through do_IRQ() now call generic_smp_call_function_interrupt() directly to avoid incrementing irq_count a second time. Platforms which don't (loongson, sgi-ip27, sibyte) call generic_smp_call_function_interrupt() wrapped in irq_{enter,exit}(). Signed-off-by: Alex Smith Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/10770/ Signed-off-by: Ralf Baechle

MIPS: Malta: Don't reinitialise RTC

2015-08-03T07:25:07+00:00

On Malta, since commit a87ea88d8f6c ("MIPS: Malta: initialise the RTC at boot"), the RTC is reinitialised and forced into binary coded decimal (BCD) mode during init, even if the bootloader has already initialised it, and may even have already put it into binary mode (as YAMON does). This corrupts the current time, can result in the RTC seconds being an invalid BCD (e.g. 0x1a..0x1f) for up to 6 seconds, as well as confusing YAMON for a while after reset, enough for it to report timeouts when attempting to load from TFTP (it actually uses the RTC in that code). Therefore only initialise the RTC to the extent that is necessary so that Linux avoids interfering with the bootloader setup, while also allowing it to estimate the CPU frequency without hanging, without a bootloader necessarily having done anything with the RTC (for example when the kernel is loaded via EJTAG). The divider control is configured for a 32KHZ reference clock if necessary, and the SET bit of the RTC_CONTROL register is cleared if necessary without changing any other bits (this bit will be set when coming out of reset if the battery has been disconnected). Fixes: a87ea88d8f6c ("MIPS: Malta: initialise the RTC at boot") Signed-off-by: James Hogan Reviewed-by: Paul Burton Cc: Ralf Baechle Cc: Maciej W. Rozycki Cc: linux-mips@linux-mips.org Cc: # 3.14+ Patchwork: https://patchwork.linux-mips.org/patch/10739/ Signed-off-by: Ralf Baechle

MIPS: Malta: Make GIC FDC IRQ workaround Malta specific

2015-07-10T09:02:18+00:00

Wider testing reveals that the Fast Debug Channel (FDC) interrupt is routed through the GIC just fine on Pistachio SoC, even though it contains interAptiv cores. Clearly the FDC interrupt routing problems previously observed on interAptiv and proAptiv cores are specific to the Malta FPGA bitstreams. Move the workaround for interAptiv and proAptiv out of gic_get_c0_fdc_int() in the GIC irqchip driver into Malta's get_c0_fdc_int() platform callback, to allow the Pistachio SoC to use the FDC interrupt. Signed-off-by: James Hogan Cc: Ralf Baechle Cc: Andrew Bresticker Cc: Thomas Gleixner Cc: Jason Cooper Cc: linux-mips@linux-mips.org Reviewed-by: Andrew Bresticker Cc: James Hartley Patchwork: http://patchwork.linux-mips.org/patch/9748/ Signed-off-by: Ralf Baechle

MIPS: Malta: Basic DT plumbing

2015-06-21T19:54:29+00:00

Build a DT for the Malta platform into the kernel, load it & probe devices from it. The DT is essentially empty at this point, devices will be added in further patches. [ralf@linux-mips.org: Fixed conflicts.] Signed-off-by: Paul Burton Cc: linux-mips@linux-mips.org Cc: devicetree@vger.kernel.org Cc: Rob Herring Cc: Pawel Moll Cc: Mark Rutland Cc: Ian Campbell Cc: Kumar Gala Cc: Andrew Bresticker Cc: linux-kernel@vger.kernel.org Cc: Markos Chandras Patchwork: http://patchwork.linux-mips.org/patch/10119/ Signed-off-by: Ralf Baechle

Merge tag 'tty-4.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

2015-04-21T16:33:10+00:00

Pull tty/serial updates from Greg KH: "Here's the big tty/serial driver update for 4.1-rc1. It was delayed for a bit due to some questions surrounding some of the console command line parsing changes that are in here. There's still one tiny regression for people who were previously putting multiple console command lines and expecting them all to be ignored for some odd reason, but Peter is working on fixing that. If not, I'll send a revert for the offending patch, but I have faith that Peter can address it. Other than the console work here, there's the usual serial driver updates and changes, and a buch of 8250 reworks to try to make that driver easier to maintain over time, and have it support more devices in the future. All of these have been in linux-next for a while" * tag 'tty-4.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (119 commits) n_gsm: Drop unneeded cast on netdev_priv sc16is7xx: expose RTS inversion in RS-485 mode serial: 8250_pci: port failed after wakeup from S3 earlycon: 8250: Document kernel command line options earlycon: 8250: Fix command line regression earlycon: Fix __earlycon_table stride tty: clean up the tty time logic a bit serial: 8250_dw: only get the clock rate in one place serial: 8250_dw: remove useless ACPI ID check dmaengine: hsu: move memory allocation to GFP_NOWAIT dmaengine: hsu: remove redundant pieces of code serial: 8250_pci: add Intel Tangier support dmaengine: hsu: add Intel Tangier PCI ID serial: 8250_pci: replace switch-case by formula for Intel MID serial: 8250_pci: replace switch-case by formula tty: cpm_uart: replace CONFIG_8xx by CONFIG_CPM1 serial: jsm: some off by one bugs serial: xuartps: Fix check in console_setup(). serial: xuartps: Get rid of register access macros. serial: xuartps: Fix iobase use. ...

Merge branch '4.0-fixes' into mips-for-linux-next

2015-04-13T14:03:32+00:00

MIPS: Malta: Detect and fix bad memsize values

2015-04-10T13:41:49+00:00

memsize denotes the amount of RAM we can access from kseg{0,1} and that should be up to 256M. In case the bootloader reports a value higher than that (perhaps reporting all the available RAM) it's best if we fix it ourselves and just warn the user about that. This is usually a problem with the bootloader and/or its environment. [ralf@linux-mips.org: Remove useless parens as suggested bei Sergei. Reformat long pr_warn statement to fit into 80 column limit.] Signed-off-by: Markos Chandras Cc: # v3.15+ Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9362/ Signed-off-by: Ralf Baechle

MIPS: Malta: malta-time: Ensure GIC counter is running

2015-03-31T10:04:13+00:00

Start the GIC counter before we try to determine its frequency. Signed-off-by: Markos Chandras Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9596/ Signed-off-by: Ralf Baechle

MIPS: Malta: Implement get_c0_fdc_int()

2015-03-31T10:04:12+00:00

Implement the weak get_c0_fdc_int() function for Malta. The Fast Debug Channel (FDC) interrupt is obtained mainly depending on whether a GIC is present. Vectored external interrupt mode isn't yet supported. Signed-off-by: James Hogan Cc: Ralf Baechle Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/9143/ Signed-off-by: Ralf Baechle