David Daney [Wed, 3 Dec 2014 19:12:23 +0000 (11:12 -0800)]
MIPS: Add FPU emulator counter for emulated delay slots.
Delay slot emulation in the FPU emulator is the only kernel user of an
executable stack, it is also very slow. Add a counter so we can see
how many of these emulations are done.
Jayachandran C [Wed, 7 Jan 2015 11:28:35 +0000 (16:58 +0530)]
MIPS: Netlogic: Do not enable SUE for core
Enabling the SUE bit for core can can result in rare cache errors
which are difficult to track down, so do not enable it. This can
cause a minor performance loss in some tests.
Jayachandran C [Wed, 7 Jan 2015 11:28:33 +0000 (16:58 +0530)]
MIPS: Netlogic: Update function to read DRAM BARs
Change name of xlp_get_dram_map to nlm_get_dram_map to be consistent
with the rest of the functions in the file. Pass the the size of the
array 'dram_map' to the function, and ensure that it does not write
past the end of the array.
Jayachandran C [Wed, 7 Jan 2015 11:28:29 +0000 (16:58 +0530)]
MIPS: Netlogic: Use MIPS topology.h
commit bda4584cd943 ("MIPS: Support CPU topology files in sysfs")
added topology related macros for all MIPS platforms and commit bbbf6d8768f5 ("MIPS: NL: Fix nlm_xlp_defconfig build error")
removed most of the contents from mach-netlogic/topology.h.
The netlogic specific topology is not needed anymore, we just need
to setup the package field in current_cpu_data.
MIPS: Netlogic: Fix frequency calculation register
Change the PIC frequency calculation to use the register that has the
current configuration. The existing code used the register that is
written to change frequency, which can have an invalid value if the
firmware did not set it up correctly.
Qingmin Liu [Wed, 7 Jan 2015 11:28:23 +0000 (16:58 +0530)]
MIPS: Netlogic: Fix nlm_xlp2_get_pic_frequency to use ref_div
The variable ref_div is initialized to the correct divisor but not
used in the frequency calculation. This caused incorrect frequency
to be reported when the clock divisor is not 3.
Signed-off-by: Qingmin Liu <qingmin@broadcom.com> Signed-off-by: Jayachandran C <jchandra@broadcom.com> Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8884/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Shanghui Liu [Wed, 7 Jan 2015 11:28:22 +0000 (16:58 +0530)]
MIPS: Netlogic: Fix wait for slave CPUs
For core 0, the condition of "cpu == bootcpu" is always true, so it
does not wait for other three threads to become ready. Fix this by
using correct check.
Signed-off-by: Shanghui Liu <shliu@broadcom.com> Signed-off-by: Jayachandran C <jchandra@broadcom.com> Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8881/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Remove variable self-assignments.
This silences a bunch of -Wself-assign warnings reported by clang.
The changed code can be compiled without warnings by both gcc and clang.
Daniel Sanders [Tue, 24 Feb 2015 15:25:10 +0000 (15:25 +0000)]
MIPS: LLVMLinux: Fix an 'inline asm input/output type mismatch' error.
Replace incorrect matching constraint that caused the error with an alternative
that still has the required constraints on the inline assembly.
This is the error message reported by clang:
arch/mips/include/asm/checksum.h:285:27: error: unsupported inline asm: input with type '__be32' (aka 'unsigned int') matching output with type 'unsigned short'
"0" (htonl(len)), "1" (htonl(proto)), "r" (sum));
^~~~~~~~~~~~
The changed code can be compiled successfully by both gcc and clang.
Signed-off-by: Daniel Sanders <daniel.sanders@imgtec.com> Signed-off-by: Toma Tabacu <toma.tabacu@imgtec.com> Suggested-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Markos Chandras <markos.chandras@imgtec.com> Cc: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/9313/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Toma Tabacu [Tue, 24 Feb 2015 15:25:09 +0000 (15:25 +0000)]
MIPS: LLVMLinux: Fix a 'cast to type not present in union' error.
Remove a cast to the 'mips16e_instruction' union inside an if
condition and instead do an assignment to a local
'union mips16e_instruction' variable's 'full' member before the if
statement and use this variable in the if condition.
This is the error message reported by clang:
arch/mips/kernel/branch.c:38:8: error: cast to union type from type 'unsigned short' not present in union
if (((union mips16e_instruction)inst).ri.opcode
^ ~~~~
The changed code can be compiled successfully by both gcc and clang.
Signed-off-by: Toma Tabacu <toma.tabacu@imgtec.com> Signed-off-by: Daniel Sanders <daniel.sanders@imgtec.com> Cc: Andreas Herrmann <andreas.herrmann@caviumnetworks.com> Cc: David Daney <david.daney@cavium.com> Cc: Manuel Lauss <manuel.lauss@gmail.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/9312/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Daniel Sanders [Tue, 24 Feb 2015 15:02:57 +0000 (15:02 +0000)]
MIPS: Changed current_thread_info() to an equivalent supported by both clang and GCC
Without this, a 'break' instruction is executed very early in the boot and
the boot hangs.
The problem is that clang doesn't honour named registers on local variables
and silently treats them as normal uninitialized variables. However, it
does honour them on global variables.
Signed-off-by: Daniel Sanders <daniel.sanders@imgtec.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Burton <paul.burton@imgtec.com> Cc: Markos Chandras <markos.chandras@imgtec.com> Cc: James Hogan <james.hogan@imgtec.com> Cc: linux-mips@linux-mips.org Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Cc: David Daney <ddaney.cavm@gmail.com> Acked-by: Behan Webster <behanw@converseincode.com>
Patchwork: https://patchwork.linux-mips.org/patch/9311/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Steven J. Hill [Fri, 27 Feb 2015 00:16:39 +0000 (18:16 -0600)]
MIPS: XPA: Add new configuration file.
Add in new config files for enabling a XPA platform.
Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com> Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9354/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
David Daney [Thu, 5 Mar 2015 14:31:29 +0000 (17:31 +0300)]
MIPS: OCTEON: Add semaphore to serialize bootbus accesses.
Some hardware blocks attached to the OCTEON bootbus run asynchronously
to accesses from the CPUs. These include MMC/SD host, CF(when using
DMA), and NAND controller. A bus error, or corrupt data may occur if
a CPU is trying to access a bootbus connected device at the same time
the bus is running asynchronous operations.
To work around these problems we add this semaphore that must be
acquired before initiating bootbus activity. Subsequent patches will
add users for this.
Kevin Cernekee [Thu, 25 Dec 2014 17:49:20 +0000 (09:49 -0800)]
MIPS: BMIPS: Add DTS files for several platforms
Most of the supported chips use legacy (non-DT) bootloaders, so they will
need to select an appropriate builtin DTB at compile time until the
bootloader is updated. Provide suitable DTS files, and a means to compile
one of them into the kernel image.
Kevin Cernekee [Thu, 25 Dec 2014 17:49:18 +0000 (09:49 -0800)]
MIPS: BMIPS: Refresh BCM3384 DTS files
The DT bindings for this platform have changed as the bootloader and
product requirements evolved. In particular, there are both
Linux-on-Zephyr and Linux-on-Viper configurations.
Kevin Cernekee [Thu, 25 Dec 2014 17:49:15 +0000 (09:49 -0800)]
MIPS: BMIPS: Delete the irqchip driver from irq.c
BCM3384/BCM63xx can use the common drivers/irqchip/irq-bcm7120-l2.c for
this purpose; BCM7xxx will use drivers/irqchip/irq-bcm7038-l1.c. We no
longer need this code under arch/mips.
Kevin Cernekee [Thu, 25 Dec 2014 17:49:06 +0000 (09:49 -0800)]
IRQCHIP: Add new driver for BCM7038-style level 1 interrupt controllers
This is the main peripheral IRQ controller on the BCM7xxx MIPS chips;
it has the following characteristics:
- 64 to 160+ level IRQs
- Atomic set/clear registers
- Reasonably predictable register layout (N status words, then N
mask status words, then N mask set words, then N mask clear words)
- SMP affinity supported on most systems
- Typically connected to MIPS IRQ 2,3,2,3 on CPUs 0,1,2,3
This driver registers one IRQ domain and one IRQ chip to cover all
instances of the block. Up to 4 instances of the block may appear, as
it supports 4-way IRQ affinity on BCM7435.
The same block exists on the ARM BCM7xxx chips, but typically the ARM GIC
is used instead. So this driver is primarily intended for MIPS STB chips.
Kevin Cernekee [Thu, 25 Dec 2014 17:49:05 +0000 (09:49 -0800)]
IRQCHIP: bcm7120-l2: Add support for BCM3380-style controllers
These controllers support multiple enable/status pairs (64+ IRQs),
can put the enable/status words at different offsets, and do not
support multiple parent IRQs.
Kevin Cernekee [Thu, 25 Dec 2014 17:49:04 +0000 (09:49 -0800)]
IRQCHIP: bcm7120-l2: Split STB-specific logic into its own function
The BCM7xxx instances of this block (listed in the register manual as
simply "IRQ0") all have the following items in common:
- brcm,int-map-mask: for routing different bits in the L2 to different
parent IRQs
- brcm,int-fwd-mask: for hardwiring certain IRQs to bypass the L2 and
use dedicated L1 lines
- one enable/status pair (32 bits only)
Much of the driver code can be shared with BCM3380-style controllers, but
in order to do this cleanly, let's split out the BCM7xxx-specific logic
first.
Kevin Cernekee [Thu, 25 Dec 2014 17:49:03 +0000 (09:49 -0800)]
IRQCHIP: bcm7120-l2: Refactor driver for arbitrary IRQEN/IRQSTAT offsets
Currently the driver assumes that REG_BASE+0x00 is the IRQ enable mask,
and REG_BASE+0x04 is the IRQ status mask. This is true on BCM3384 and
BCM7xxx, but it is not true for some of the controllers found on BCM63xx
chips. So we will change a couple of key assumptions:
- Don't assume that both the IRQEN and IRQSTAT registers will be
covered by a single ioremap() operation.
- Don't assume any particular ordering (IRQSTAT might show up before
IRQEN on some chips).
- For an L2 controller with >=64 IRQs, don't assume that every
IRQEN/IRQSTAT pair will use the same register spacing.
This patch changes the "plumbing" but doesn't yet provide a way for users
to instantiate a controller with arbitrary IRQEN/IRQSTAT offsets.
Brian Norris [Thu, 25 Dec 2014 17:49:02 +0000 (09:49 -0800)]
IRQCHIP: brcmstb-l2: don't clear wakeable interrupts at init time
Wakeable interrupts might be pending at boot/init time, because wakeup
interrupts might have triggered a resume from S5. So don't clear such
wakeups.
This means that any driver which requests a wakeable interrupt bit
should be prepared to handle an interrupt as soon as they call
request_irq(). (This is technically already the correct development
practice, but some drivers probably expect not to receive interrupts
until they have performed some I/O.)
Kevin Cernekee [Thu, 25 Dec 2014 17:49:00 +0000 (09:49 -0800)]
MIPS: bcm3384: Rename "bcm3384" target to "bmips"
This platform is configured primarily through device tree, and we can
reuse the same code to support a bunch of other chips. Change the name
to reflect this.
[ralf@linux-mips.org: Fix conflicts with other patches.]
Deng-Cheng Zhu [Sat, 7 Mar 2015 18:30:35 +0000 (10:30 -0800)]
MIPS: Add support for fine granularity task level IRQ time accounting
With sched_clock being ready, it makes sense to add the option of IRQ time
accounting -- When we have a fast enough sched_clock, IRQ time accounting
will be enabled (see sched_clock_register).
Deng-Cheng Zhu [Sat, 7 Mar 2015 18:30:33 +0000 (10:30 -0800)]
MIPS: csrc-sb1250: Remove FSF mail address from GPL notice
This is to make checkpatch.pl happy for the next patch. It would otherwise
say --
ERROR: Do not include the paragraph about writing to the Free Software
Foundation's mailing address from the sample GPL notice. The FSF has
changed addresses in the past, and may do so again. Linux already includes
a copy of the GPL.
Deng-Cheng Zhu [Sat, 7 Mar 2015 18:30:27 +0000 (10:30 -0800)]
MIPS: csrc-ioasic: Remove FSF mail address from GPL notice
This is to make checkpatch.pl happy for the next patch. It would otherwise
say --
ERROR: Do not include the paragraph about writing to the Free Software
Foundation's mailing address from the sample GPL notice. The FSF has
changed addresses in the past, and may do so again. Linux already includes
a copy of the GPL.
Acked-by: Maciej W. Rozycki <macro@linux-mips.org> Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@imgtec.com> Cc: linux-mips@linux-mips.org Cc: macro@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9481/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Deng-Cheng Zhu [Sat, 7 Mar 2015 18:30:25 +0000 (10:30 -0800)]
MIPS: csrc-bcm1480: Remove FSF mail address from GPL notice
This is to make checkpatch.pl happy for the next patch. It would otherwise
say --
ERROR: Do not include the paragraph about writing to the Free Software
Foundation's mailing address from the sample GPL notice. The FSF has
changed addresses in the past, and may do so again. Linux already includes
a copy of the GPL.
Deng-Cheng Zhu [Sat, 7 Mar 2015 18:30:23 +0000 (10:30 -0800)]
MIPS: Add sched_clock support
This will provide sched_clock interface to implement individual
read_sched_clock(). Not for CAVIUM_OCTEON_SOC as it defines its own
sched_clock() directly (not using the sched_clock_register interface).
GENERIC_SCHED_CLOCK can be selected by architectures other than ARM. The
current dependencies of CLKSRC_VERSATILE make it possible that other
architectures will have CLKSRC_VERSATILE available in configuration once
they select GENERIC_SCHED_CLOCK, whereas this clock source should be solely
available to ARM in reality.
This patch adds one more dependency to CLKSRC_VERSATILE to fix the issue.
Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@imgtec.com> Reported-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: Russell King <linux@arm.linux.org.uk> Cc: LKML <linux-kernel@vger.kernel.org> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9476/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Deng-Cheng Zhu [Sat, 7 Mar 2015 18:30:20 +0000 (10:30 -0800)]
MIPS: Fall back to generic implementation of cmpxchg64 on 32-bit platforms
This is in preparation of adding HAVE_VIRT_CPU_ACCOUNTING_GEN support in
the next patch.
Without having cmpxchg64 to use the generic implementation, kernel linking
will complain:
kernel/built-in.o: In function `cputime_adjust':
cputime.c:(.text+0x33748): undefined reference to `__cmpxchg_called_with_bad_pointer'
cputime.c:(.text+0x33810): undefined reference to `__cmpxchg_called_with_bad_pointer'
Deng-Cheng Zhu [Sat, 7 Mar 2015 18:30:19 +0000 (10:30 -0800)]
MIPS: Add SCHED_HRTICK support
We have HIGH_RES_TIMERS to support SCHED_HRTICK. But SCHED_HRTICK is in
kernel/Kconfig.hz where HZ values unsuitable for MIPS are defined. So we
simply add this config in arch/mips/Kconfig as opposed to including the
whole kernel/Kconfig.hz.
Markos Chandras [Mon, 23 Mar 2015 12:32:01 +0000 (12:32 +0000)]
IRQCHIP: irq-mips-gic: Add new functions to start/stop the GIC counter
We add new functions to start and stop the GIC counter since there are no
guarantees the counter will be running after a CPU reset. The GIC counter
is stopped by setting the 29th bit on the GIC Config register and it is
started by clearing that bit.
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Andrew Bresticker <abrestic@chromium.org> Cc: Qais Yousef <qais.yousef@imgtec.com> Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9594/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
James Hogan [Thu, 29 Jan 2015 11:14:14 +0000 (11:14 +0000)]
ttyFDC: Implement KGDB IO operations.
Implement KGDB IO operations for MIPS Fast Debug Channel (FDC). This can
be enabled via Kconfig, which also allows the channel number to be
chosen.
The magic sysrq hack is implemented in the TTY driver, detecting just ^C
for the KGDB channel, and ^O followed by a letter for the FDC console
channel.
The KGDB operations are reasonably efficient thanks to the flush
callback, with a 4 byte buffer being used in both directions to allow up
to 4 bytes to be encoded per FDC word. Reading of data for KGDB will
discard any data received on other channels, which clearly isn't ideal,
but given that there is a single FIFO shared between channels we can't
do much better.
James Hogan [Thu, 29 Jan 2015 11:14:12 +0000 (11:14 +0000)]
TTY: Add MIPS EJTAG Fast Debug Channel TTY driver
Add TTY driver and consoles for the MIPS EJTAG Fast Debug Channel (FDC),
which is found on the per-CPU MIPS Common Device Mapped Memory (CDMM)
bus.
The FDC is a per-CPU device which is used to communicate with an EJTAG
probe. RX and TX FIFOs exist, containing 32-bits of data and 4-bit
channel numbers. 16 general data streams are implemented on this for TTY
and console use by encoding up to 4 bytes on each 32-bit FDC word.
The TTY devices are named e.g. /dev/ttyFDC3c2 for channel 2 of the FDC
attached to logical CPU 3.
These can be used for getting the kernel log, a login prompt, or as a
GDB remote transport, all over EJTAG and without needing a serial port.
It can have an interrupt to notify of when incoming data is available in
the RX FIFO or when the TX FIFO is no longer full. The detection of this
interrupt occurs in architecture / platform code, but it may be shared
with the timer and/or performance counter interrupt.
Due to the per-CPU nature of the hardware, all outgoing TTY data is
written out from a kthread which is pinned to the appropriate CPU.
The console is not bound to a specific CPU, so output will appear on the
chosen channel on whichever CPU the code is executing on. Enable with
e.g. console=fdc1 in kernel arguments. /dev/console is bound to the same
channel on the boot CPU's FDC if it exists.
James Hogan [Thu, 29 Jan 2015 11:14:11 +0000 (11:14 +0000)]
MIPS: idle: Workaround wait + FDC problems
On certain cores (namely proAptiv and P5600) incoming data via a Fast
Debug Channel (FDC) while the core is blocked on a wait instruction will
cause the wait not to wake up even when another interrupt is received.
This makes an idle target stop as soon as you send FDC data to it, until
the debug probe interrupts it and restarts the wait instruction.
This is worked around by avoiding using r4k_wait on these cores if
CONFIG_MIPS_EJTAG_FDC_TTY is enabled (which would imply the user intends
to use the FDC).
James Hogan [Thu, 29 Jan 2015 11:14:10 +0000 (11:14 +0000)]
MIPS: Malta: Implement get_c0_fdc_int()
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.
James Hogan [Thu, 29 Jan 2015 11:14:09 +0000 (11:14 +0000)]
IRQCHIP: mips-gic: Add function for retrieving FDC IRQ
Add a function to the MIPS GIC driver for retrieving the Fast Debug
Channel (FDC) interrupt number, similar to the existing ones for the
timer and perf counter interrupts. This will be used by platform
implementations of get_c0_fdc_int() if a GIC is present.
A workaround exists for interAptiv and proAptiv which claim to be able
to route the FDC interrupt but don't seem to be able to in practice (at
least on Malta).
[ralf@linux-mips.org: Fix conflict.]
Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Andrew Bresticker <abrestic@chromium.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jason Cooper <jason@lakedaemon.net> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/9142/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
James Hogan [Thu, 29 Jan 2015 11:14:08 +0000 (11:14 +0000)]
irqchip: mips-gic: Don't treat FDC IRQ as percpu devid
Treat the Fast Debug Channel (FDC) interrupt the same as the timer and
performance counter interrupts. Like them, the FDC IRQ is also per-VPE,
and also doesn't use a per-CPU device ID yet. Per-CPU device IDs don't
seem to work with IRQF_SHARED which is needed for compatibility with
cores which don't route the FDC IRQ through the GIC. For hardware which
routes FDC IRQs through the GIC this is something that could be added
later.
Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Andrew Bresticker <abrestic@chromium.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jason Cooper <jason@lakedaemon.net> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/9141/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
James Hogan [Thu, 29 Jan 2015 11:14:07 +0000 (11:14 +0000)]
MIPS: Read CPU IRQ line that FDC to routed to
Read the CPU IRQ line reportedly used for the Fast Debug Channel (FDC)
interrupt from the IntCtl register and store it in cp0_fdc_irq where
platform implementations of the new weak platform function
get_c0_fdc_int() can refer to it.
[ralf@linux-mips.org: Fixed conflict.]
Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: James Hogan <james.hogan@imgtec.com>
Patchwork: https://patchwork.linux-mips.org/patch/9140/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
James Hogan [Thu, 29 Jan 2015 11:14:06 +0000 (11:14 +0000)]
MIPS: Add architectural FDC IRQ fields
Add architectural field definitions relating to the Fast Debug Channel
(FDC) interrupt, namely the pending bit in Cause and the field in
IntCtl to specify which CPU IRQ line the FDC interrupt is routed to.
Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: James Hogan <james.hogan@imgtec.com>
Patchwork: https://patchwork.linux-mips.org/patch/9139/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
James Hogan [Mon, 2 Feb 2015 11:45:10 +0000 (11:45 +0000)]
MIPS: Malta: Implement mips_cdmm_phys_base()
Implement mips_cdmm_phys_base() for Malta, returning the physical base
address 0x1fc10000 which is "typically unused".
This allows the Common Device Memory Map (CDMM) region to be mapped, and
devices in that region (such as the Fast Debug Channel (FDC) hardware
for communication over EJTAG) to be discovered.
James Hogan [Wed, 25 Mar 2015 15:39:50 +0000 (15:39 +0000)]
MIPS: Add CDMM bus support
Add MIPS Common Device Memory Map (CDMM) support in the form of a bus in
the standard Linux device model. Each device attached via CDMM is
discoverable via an 8-bit type identifier and may contain a number of
blocks of memory mapped registers in the CDMM region. IRQs are expected
to be handled separately.
Due to the per-cpu (per-VPE for MT cores) nature of the CDMM devices,
all the driver callbacks take place from workqueues which are run on the
right CPU for the device in question, so that the driver doesn't need to
be as concerned about which CPU it is running on. Callbacks also exist
for when CPUs are taken offline, so that any per-CPU resources used by
the driver can be disabled so they don't get forcefully migrated. CDMM
devices are created as children of the CPU device they are attached to.
Any existing CDMM configuration by the bootloader will be inherited,
however platforms wishing to enable CDMM should implement the weak
mips_cdmm_phys_base() function (see asm/cdmm.h) so that the bus driver
knows where it should put the CDMM region in the physical address space
if the bootloader hasn't already enabled it.
A mips_cdmm_early_probe() function is also provided to allow early boot
or particularly low level code to set up the CDMM region and probe for a
specific device type, for example early console or KGDB IO drivers for
the EJTAG Fast Debug Channel (FDC) CDMM device.
James Hogan [Mon, 2 Feb 2015 11:45:08 +0000 (11:45 +0000)]
MIPS: Add arch CDMM definitions and probing
Add architectural definitions and probing for the MIPS Common Device
Memory Map (CDMM) region. When supported and enabled at a particular
physical address, this region allows some number of per-CPU devices to
be discovered and controlled via MMIO.
A bit exists in Config3 to determine whether the feature is present, and
a CDMMBase CP0 register allows the region to be enabled at a particular
physical address.
[ralf@linux-mips.org: Sort conflict with other patches.]
James Hogan [Tue, 27 Jan 2015 21:45:55 +0000 (21:45 +0000)]
MIPS: Allow shared IRQ for timer & perf counter
Before release 2 of the architecture there weren't separate interrupt
pending bits for the local CPU interrupts (timer & perf counter
overflow), so when they were connected to the same interrupt line the
timer handler had to call the performance counter handler before knowing
whether a timer interrupt was actually pending.
Now another CPU local interrupt, for the Fast Debug Channel (FDC), can
also be routed to an arbitrary interrupt line. It isn't scalable to keep
adding cross-calls between handlers for these cases of shared interrupt
lines, especially since the FDC could in theory share its interrupt line
with the performance counter, timer, or both.
Fortunately since release 2 of the architecture separate interrupt
pending bits do exist in the Cause register. This allows local
interrupts which share an interrupt line to have separate handlers using
IRQF_SHARED. Unfortunately they can't easily have their own irqchip as
there is no generic way to individually mask them.
Enable this sharing to happen by removing the special case for when the
perf count shares an IRQ with the timer. cp0_perfcount_irq and
cp0_compare_irq can then be set to the same value with shared interrupt
handlers registered for both of them.
Pre-R2 code should be unaffected. cp0_perfcount_irq will always be -1
and the timer handler will contnue to call into the perf counter
handler.
James Hogan [Tue, 27 Jan 2015 21:45:54 +0000 (21:45 +0000)]
MIPS: OProfile: Allow sharing IRQ with timer
When requesting the performance counter overflow interrupt, pass flags
which are compatible with the cevt-r4k driver, in particular
IRQF_SHARED so that the two handlers can share the same IRQ. This is
possible since release 2 of the architecture where there are separate
pending interrupt bits for the timer interrupt and the performance
counter interrupt.
This will be necessary since the FDC interrupt can also be arbitrarily
routed to a CPU interrupt, possibly sharing with the timer, the
performance counters, or both, and it isn't scalable to have all the
handlers able to call other handlers that may be on the same IRQ line.
James Hogan [Tue, 27 Jan 2015 21:45:53 +0000 (21:45 +0000)]
MIPS: perf: Allow sharing IRQ with timer
When requesting the performance counter overflow interrupt, pass flags
which are compatible with the cevt-r4k driver, in particular
IRQF_SHARED so that the two handlers can share the same IRQ. This is
possible since release 2 of the architecture where there are separate
pending interrupt bits for the timer interrupt and the performance
counter interrupt.
This will be necessary since the FDC interrupt can also be arbitrarily
routed to a CPU interrupt, possibly sharing with the timer, the
performance counters, or both, and it isn't scalable to have all the
handlers able to call other handlers that may be on the same IRQ line.
Shared handlers must also have a unique device pointer so they can be
individually removed, so &mipspmu is now passed in for that instead of
NULL.
Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/9129/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
James Hogan [Tue, 27 Jan 2015 21:45:52 +0000 (21:45 +0000)]
MIPS: cevt-r4k: Make interrupt handler shared
Make the cevt-r4k interrupt handler shared so that other interrupt
handlers (specifically the performance counter overflow handler and fast
debug channel interrupt handler) can share the same interrupt line.
This simply imvolves returning IRQ_NONE when no timer interrupt has been
handled to allow other handlers to run, and passing IRQF_SHARED when
setting up the IRQ handler so that other handlers (with compatible
flags) can be registered.
James Hogan [Tue, 27 Jan 2015 21:45:51 +0000 (21:45 +0000)]
IRQCHIP: mips-gic: Add missing definitions for FDC IRQ
Add missing VPE_PEND, VPE_RMASK and VPE_SMASK definitions for the local
FDC interrupt.
These local interrupt definitions aren't directly used, but if they
exist they should be complete.
Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Andrew Bresticker <abrestic@chromium.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jason Cooper <jason@lakedaemon.net> Cc: linux-mips@linux-mips.org Reviewed-by: Andrew Bresticker <abrestic@chromium.org> Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/9127/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
James Hogan [Tue, 27 Jan 2015 21:45:50 +0000 (21:45 +0000)]
IRQCHIP: mips-gic: Fix typo in comment
Fix typo in comment in gic_get_c0_perfcount_int:
"erformance" -> "performance".
Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Andrew Bresticker <abrestic@chromium.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jason Cooper <jason@lakedaemon.net> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Andrew Bresticker <abrestic@chromium.org>
Patchwork: https://patchwork.linux-mips.org/patch/9126/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
James Hogan [Tue, 27 Jan 2015 21:45:49 +0000 (21:45 +0000)]
MIPS: Remove redundant IPTI==IPPCI logic
The situation where the timer interrupt is on the same line as the
performance counter interrupt is handled in per_cpu_trap_init() by
setting cp0_perfcount_irq to -1, so there is no need to duplicate the
logic conditional upon cp0_perfcount_irq >= 0 in perf
(init_hw_perf_events()) and oprofile (mipsxx_init()).
James Hogan [Tue, 27 Jan 2015 21:45:47 +0000 (21:45 +0000)]
MIPS: cevt-r4k: Move handle_perf_irq() out of header
Long ago, commit 8531a35e5e27 ("[MIPS] SMTC: Fix SMTC dyntick support.")
moved handle_perf_irq() out of cevt-r4k.c into a header so it could be
shared with cevt-smtc.c.
Slightly less long ago, commit b633648c5ad3 ("MIPS: MT: Remove SMTC
support") removed all traces of SMTC support, including cevt-smtc.c,
leaving cevt-r4k.c once again the sole user of handle_perf_irq(),
therefore move it back into cevt-r4k.c from the header.
Add initial support for boards based on the Imagination Pistachio SoC.
Pistachio is based on a dual-core MIPS interAptiv CPU and will boot
using device-tree.
Signed-off-by: James Hartley <james.hartley@imgtec.com> Signed-off-by: Andrew Bresticker <abrestic@chromium.org> Cc: devicetree@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Cc: Ezequiel Garcia <ezequiel.garcia@imgtec.com> Cc: James Hogan <james.hogan@imgtec.com>
Patchwork: https://patchwork.linux-mips.org/patch/9569/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
MIPS: Document Pistachio boot protocol and device-tree bindings
The Pistachio SoC boots only with device-tree. Document the required
properties and nodes as well as the boot protocol between the bootlaoder
and the kernel.
Signed-off-by: Andrew Bresticker <abrestic@chromium.org> Cc: Rob Herring <robh+dt@kernel.org> Cc: Pawel Moll <pawel.moll@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Ian Campbell <ijc+devicetree@hellion.org.uk> Cc: Kumar Gala <galak@codeaurora.org> Cc: devicetree@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Cc: Andrew Bresticker <abrestic@chromium.org> Cc: Ezequiel Garcia <ezequiel.garcia@imgtec.com> Cc: James Hartley <james.hartley@imgtec.com> Cc: James Hogan <james.hogan@imgtec.com>
Patchwork: https://patchwork.linux-mips.org/patch/9568/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
MIPS: Allow platforms to specify the decompressor load address
Platforms which use raw zboot images may need to link the image at
a fixed address if there is no other way to communicate the load
address to the bootloader. Allow the per-platform Kbuild files
to specify an optional zboot image load address (zload-y) and fall
back to calc_vmlinuz_load_addr if unset.
Signed-off-by: Andrew Bresticker <abrestic@chromium.org> Cc: Lars-Peter Clausen <lars@metafoo.de> Cc: devicetree@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Cc: Andrew Bresticker <abrestic@chromium.org> Cc: Ezequiel Garcia <ezequiel.garcia@imgtec.com> Cc: James Hartley <james.hartley@imgtec.com> Cc: James Hogan <james.hogan@imgtec.com>
Patchwork: https://patchwork.linux-mips.org/patch/9566/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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