Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

In the early days, the A10 and A13 shared quite some code. Nowadays it
shares less and less code, the A31 diverging even more, so it doesn't
make much sense to continue to maintain this structure, just use one
DTSI for every SoC, and that's it.
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

The port controller needs the apb0_pio clock enabled to be able to
work. This commit declares that on the device tree.
Signed-off-by: NEmilio López <emilio@elopez.com.ar>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

All the UARTs are connected to clock gates; now that our clock driver
is able to handle them, make the switch.
Signed-off-by: NEmilio López <emilio@elopez.com.ar>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

This commit adds the corresponding DT bindings for all the AXI,
AHB, APB0 and APB1 gates.
Signed-off-by: NEmilio López <emilio@elopez.com.ar>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

We previously relied on the bootloader to do the muxing of the UART for
the Cubieboard. Don't rely on it anymore and use pinctrl.

Also remove uart1, as it is not enabled by default and it's not exposed
on the board headers.
Signed-off-by: NEmilio López <emilio@elopez.com.ar>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

We previously relied on the bootloader to do the muxing of the UART for
the Hackberry. Don't rely on it anymore and use pinctrl.
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: NEmilio López <emilio@elopez.com.ar>

The Allwinner A10 SoC has 8 available UARTs, which is 6 more than on the
A13, so add the missing UARTs to the sun4i-a10 dtsi.
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: NEmilio López <emilio@elopez.com.ar>

Both A10 and A13 Allwinner SoCs have a Synopsys APB uart3 device
available, so add it to the sunxi.dtsi file
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: NEmilio López <emilio@elopez.com.ar>

The UART0 is only available on the Allwinner A10 SoCs, and not on the
A13, so move the uart0 node to sun4i-a10.dtsi.
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: NEmilio López <emilio@elopez.com.ar>
Tested-by: NEmilio López <emilio@elopez.com.ar>

The other architecture use serial@address for their uart nodes, so
rename our uart dt nodes to be consistent
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

It will be especially useful when we will have the clock definitions in
the device tree.
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: NEmilio López <emilio@elopez.com.ar>
Tested-by: NEmilio López <emilio@elopez.com.ar>

During the introduction of the Allwinner SoC platforms, sunxi was
initially meant as a generic name for all the variants of the Allwinner
SoC.

It was ok at the time of the support of only the A10 and A13 that
look pretty much the same; but it's beginning to be troublesome with
the future addition of the Allwinner A31 (sun6i) that is quite
different, and would introduce some weird logic, where sunxi would
actually mean in some case sun4i and sun5i but without sun6i...

Moreover, it makes the compatible strings naming scheme not consistent
with other architectures, where usually for this kind of compability, we
just use the oldest SoC name that has this IP, so let's do just this.
Signed-off-by: NEmilio López <emilio@elopez.com.ar>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

This introduces proper clock definitions on sunxi.dtsi, to be used
with the new clock driver for sunxi.
Signed-off-by: NEmilio López <emilio@elopez.com.ar>
Acked-by: NMike Turquette <mturquette@linaro.org>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

This board comes with an Allwinner A10, two external USB ports, a SD
Card reader, 1GB of RAM, the usual video connectors and an onboard wifi
chip.

Of course, the support is quite minimal for now...
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

Cubieboard has two LEDs available for use, a blue one (labeled LED1)
and a green one (labeled LED2).
Signed-off-by: NEmilio López <emilio@elopez.com.ar>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

metag/allmodconfig:

drivers/media/v4l2-core/videobuf2-dma-contig.c: In function 'vb2_dc_get_base_sgt':
drivers/media/v4l2-core/videobuf2-dma-contig.c:387: error: implicit declaration of function 'dma_get_sgtable'

For architectures using dma_map_ops, dma_get_sgtable() is provided in
<asm-generic/dma-mapping-common.h>.

Metag does not use dma_map_ops yet, hence it should implement it as an
inline stub using dma_common_get_sgtable().
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: NMarek Szyprowski <m.szyprowski@samsung.com>

Metag doesn't have a metag_dt_memblock_reserve() function so remove the
declaration from asm/prom.h.
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>

Make a copy of the device tree blob in non-init memory. It is required
when using built-in device tree files that the platform code copies the
blob to non-init memory prior to calling unflatten_device_tree(),
otherwise the strings that the device tree refer to will get poisoned
and potentially reused, breaking later reading of the device tree
post-init (such as compatible matching in modules, debugfs, and the
procfs interface).
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
Reviewed-by: NVineet Gupta <vgupta@synopsys.com>

Minimise metag_ksyms.c includes to directly include the <asm/*.h> files
that declare a particular symbol, and not include any unnecessary ones.
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>

It's less error prone to have function symbols exported immediately
after the function rather than in metag_ksyms.c. Move each EXPORT_SYMBOL
in metag_ksyms.c for symbols defined in mm/init.c into mm/init.c.
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>

It's less error prone to have function symbols exported immediately
after the function rather than in metag_ksyms.c. Move each EXPORT_SYMBOL
in metag_ksyms.c for symbols defined in usercopy.c into usercopy.c
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>

It's less error prone to have function symbols exported immediately
after the function rather than in metag_ksyms.c. Move each EXPORT_SYMBOL
in metag_ksyms.c for symbols defined in setup.c into setup.c
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>

It's less error prone to have function symbols exported immediately
after the function rather than in metag_ksyms.c. Move each EXPORT_SYMBOL
in metag_ksyms.c for symbols defined in kick.c into kick.c
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>

It's less error prone to have function symbols exported immediately
after the function rather than in metag_ksyms.c. Move each EXPORT_SYMBOL
in metag_ksyms.c for symbols defined in traps.c into traps.c
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>

The SMP version of arch_local_irq_enable() uses preempt_disable(), but
<asm/irqflags.h> doesn't include <linux/preempt.h> causing the following
errors on SMP when pstore/ftrace is enabled (caught by buildbot smp
allyesconfig):

In file included from include/linux/irqflags.h:15,
                 from fs/pstore/ftrace.c:16:
arch/metag/include/asm/irqflags.h: In function 'arch_local_irq_enable':
arch/metag/include/asm/irqflags.h:84: error: implicit declaration of function 'preempt_disable'
arch/metag/include/asm/irqflags.h:86: error: implicit declaration of function 'preempt_enable_no_resched'

However <linux/preempt.h> cannot be easily included from
<asm/irqflags.h> as it can cause circular include dependencies in the
!SMP case, and potentially in the SMP case in the future. Therefore move
the SMP implementation of arch_local_irq_enable() into traps.c and use
an inline version of get_trigger_mask() which is also defined in traps.c
for SMP.

This adds an extra layer of function call / stack push when
preempt_disable needs to call other functions, however in the
non-preemptive SMP case it should be about as fast, as it was already
calling the get_trigger_mask() function which is now used inline.
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>

Convert hugetlb_get_unmapped_area_new_pmd() to use vm_unmapped_area()
rather than searching the virtual address space itself. This fixes the
following errors in linux-next due to the specified members being
removed after other architectures have already been converted:

arch/metag/mm/hugetlbpage.c: In function 'hugetlb_get_unmapped_area_new_pmd':
arch/metag/mm/hugetlbpage.c:199: error: 'struct mm_struct' has no member named 'cached_hole_size'
arch/metag/mm/hugetlbpage.c:200: error: 'struct mm_struct' has no member named 'free_area_cache'
arch/metag/mm/hugetlbpage.c:215: error: 'struct mm_struct' has no member named 'cached_hole_size'
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
Acked-by: NMichel Lespinasse <walken@google.com>

Various file systems use clear_page() and copy_page(), so when they're
built as modules we get build errors like the following:

ERROR: "clear_page" [fs/ntfs/ntfs.ko] undefined!
ERROR: "copy_page" [fs/nilfs2/nilfs2.ko] undefined!

Therefore export these functions to modules from metag_ksyms.c to fix
the errors. This was hit by a randconfig build.
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>

Various file systems indirectly use metag_code_cache_flush_all(), so
when they're built as modules we get build errors like the following:

ERROR: "metag_code_cache_flush_all" [fs/xfs/xfs.ko] undefined!

Therefore export this function to modules to fix the errors. This was
hit by a randconfig build.
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>

Rename setup_txprivext() to setup_priv() and add initialisation of some
more per-thread privilege protection registers:

 - TxPRIVSYSR: 0x04400000-0x047fffff
               0x05000000-0x07ffffff
               0x84000000-0x87ffffff
 - TxPIOREG:   0x02000000-0x02ffffff
               0x04800000-0x048fffff
 - TxSYREG:    0x04000000-0x04000fff (except write fetch system event)
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>

Define PRIV_BITS using explicit constants from <asm/metag_regs.h> rather
than with a hard coded value. This also adds a couple of missing
definitions for the TXPRIVEXT priv bits for protecting writes to TXTIMER
and the trace registers.
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>

Sort includes in kernel/setup.c.
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>

Add boot time check for whether LNKGET/LNKSET go through or around the
cache. Depending on the configuration an info message (no harm), warning
(technically wrong but no harm), or big WARN (expect failure in either
kernel or userland) may be emitted if the behaviour is not as expected:

Configuration                                Hardware   Response
------------------------------------------   --------   --------
AROUND_CACHE                                 through    pr_info
!AROUND_CACHE && ATOMICITY_LNKGET            around     WARN (kernel)
     "        && !ATOMICITY_LNKGET && SMP    around     WARN (user)
     "                   "         && !SMP   around     pr_warn
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>

metag_cache_probe() is only called from setup_arch(), so add the __init
attribute to it.
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>

Add basic JTAG Debug Adapter (DA) support so that drivers which
communicate with the DA can detect whether one is actually present
(otherwise the target will halt indefinitely).

This allows the metag_da TTY driver and imgdafs filesystem driver to be
built, updates defconfigs, and sets up the metag_da console early if
it's configured in.
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>

Add ftrace support for metag.
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Reviewed-by: NSteven Rostedt <rostedt@goodmis.org>

Add Perf support for metag.
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>