linux.git/arch/xtensa/kernel, branch v3.14

Merge tag 'xtensa-for-next-20140221-1' into for_next

2014-02-24T08:34:36+00:00

Xtensa fixes for 3.14:
- allow booting xtfpga on boards with new uBoot and >128MBytes memory;
- drop nonexistent GPIO32 support from fsf variant;
- don't select USE_GENERIC_SMP_HELPERS;
- enable common clock framework support, set up ethoc clock on xtfpga;
- wire up sched_setattr and sched_getattr syscalls.

Signed-off-by: Chris Zankel

xtensa: support common clock framework

2014-02-21T17:33:42+00:00

Signed-off-by: Max Filippov

xtensa: fix fast_syscall_spill_registers

2014-01-29T21:47:26+00:00

The original implementation could clobber registers under certain conditions.

The Xtensa processor architecture uses windowed registers and the original
implementation was using a4 as a temporary register, which under certain
conditions could be register a0 of the oldest window frame, and didn't always
restore the content correctly.

By moving the _spill_registers routine inside the fast system call, it frees
up one more register (the return address is not required anymore) for the
spill routine.

Signed-off-by: Chris Zankel

xtensa: fix fast_syscall_spill_registers

2014-01-29T06:09:51+00:00

The original implementation could clobber registers under certain conditions.

The Xtensa processor architecture uses windowed registers and the original
implementation was using a4 as a temporary register, which under certain
conditions could be register a0 of the oldest window frame, and didn't always
restore the content correctly.

By moving the _spill_registers routine inside the fast system call, it frees
up one more register (the return address is not required anymore) for the
spill routine.

Signed-off-by: Chris Zankel

xtensa: save current register frame in fast_syscall_spill_registers_fixup

2014-01-25T19:24:38+00:00

We need it saved because it contains a3 where we track which register
windows we still need to spill, and fixup handler may call C exception
handlers. Also fix comments.

Cc: stable@vger.kernel.org
Signed-off-by: Max Filippov

xtensa: introduce spill_registers_kernel macro

2014-01-25T19:20:09+00:00

Most in-kernel users want registers spilled on the kernel stack and
don't require PS.EXCM to be set. That means that they don't need fixup
routine and could reuse regular window overflow mechanism for that,
which makes spill routine very simple.

Cc: stable@vger.kernel.org
Suggested-by: Chris Zankel 
Signed-off-by: Max Filippov

xtensa: export ccount_freq

2014-01-19T16:00:48+00:00

Now that ccount_freq is used in udelay and ndelay it needs to be
exported in order to be available to modules.

Signed-off-by: Max Filippov

xtensa: remap io area defined in device tree

2014-01-14T20:25:14+00:00

Use the simple-bus node to discover the io area, and remap the cached and
bypass io ranges. The parent-bus-address value of the first triplet in the
"ranges" property is used. This value is rounded down to the nearest 256MB
boundary. The length of the io area is fixed at 256MB; the "ranges" property
length value is ignored.

Other limitations: (1) only the first simple-bus node is considered, and (2)
only the first triplet of the "ranges" property is considered.

See ePAPR 1.1 §6.5 for the simple-bus node description, and §2.3.8 for the
"ranges" property description.

Signed-off-by: Baruch Siach 
Signed-off-by: Max Filippov

xtensa: support default device tree buses

2014-01-14T20:24:12+00:00

This currently includes simple-bus.

Signed-off-by: Baruch Siach 
Signed-off-by: Max Filippov

xtensa: initialize device tree clock sources

2014-01-14T20:24:05+00:00

Signed-off-by: Baruch Siach 
Signed-off-by: Max Filippov