linux-stable.git/arch/x86/kernel/pmc_atom.c, branch master

x86/platform/intel/pmc_atom: Move the PMC-Atom code to arch/x86/platform/atom

2015-07-06T16:39:38+00:00

This is specific driver for Intel Atom SoCs like BayTrail and
Braswell. Let's move it to dedicated folder and alleviate a
arch/x86/kernel burden.

There is no functional change.

Signed-off-by: Andy Shevchenko 
Cc: Aubrey Li 
Cc: Kumar P Mahesh 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Rafael J . Wysocki 
Cc: Thomas Gleixner 
Link: http://lkml.kernel.org/r/1436192944-56496-6-git-send-email-andriy.shevchenko@linux.intel.com
Signed-off-by: Ingo Molnar

x86/platform/intel/pmc_atom: Add Cherrytrail PMC interface

2015-07-06T16:39:38+00:00

The patch adds CHT PMC interface. This exposes all the South IP
device power states and S0ix states for CHT. The bit map of
FUNC_DIS and D3_STS_0 registers for SoCs are consistent. The
D3_STS_1 and FUNC_DIS_2 registers, however, are not aligned.
This is fixed by splitting a common mapping on per register basis.

(Originally based on code from Kumar P Mahesh.)

Originally-from: Kumar P Mahesh 
Signed-off-by: Andy Shevchenko 
Cc: Aubrey Li 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Rafael J . Wysocki 
Cc: Thomas Gleixner 
Link: http://lkml.kernel.org/r/1436192944-56496-5-git-send-email-andriy.shevchenko@linux.intel.com
Signed-off-by: Ingo Molnar

x86/platform/intel/pmc_atom: Supply register mappings via PMC object

2015-07-06T15:42:46+00:00

The patch converts the functions to use the register mappings
provided by PMC object. It would help in case of mappings on
different platforms.

Signed-off-by: Andy Shevchenko 
Cc: Aubrey Li 
Cc: Rafael J . Wysocki 
Cc: Kumar P Mahesh 
Link: http://lkml.kernel.org/r/1436192944-56496-4-git-send-email-andriy.shevchenko@linux.intel.com
Signed-off-by: Ingo Molnar

x86/platform/intel/pmc_atom: Print index of device in loop

2015-07-06T15:42:46+00:00

The register mapping may change from one platform to another.
Thus, indices might be not the same on different platforms. The
patch makes the code to print the device index dynamically at
run time.

The patch also changes the for loop to iterate over the map
until a terminator is found.

Signed-off-by: Andy Shevchenko 
Cc: Aubrey Li 
Cc: Rafael J . Wysocki 
Cc: Kumar P Mahesh 
Link: http://lkml.kernel.org/r/1436192944-56496-3-git-send-email-andriy.shevchenko@linux.intel.com
Signed-off-by: Ingo Molnar

x86/platform/intel/pmc_atom: Export accessors to PMC registers

2015-07-06T15:42:45+00:00

Export the pmc_atom_read() and pmc_atom_write() accessors to the PMC
registers. On early initcall stages the functions will return
-ENODEV, and caller has to wait when it will be available.

Additionally make absence of debugfs a non-fatal error.

The patch will be useful for the upcoming fixes regarding to the
LPSS block found on Intel BayTrail-T and Braswell.

Signed-off-by: Andy Shevchenko 
Cc: Aubrey Li 
Cc: Kumar P Mahesh 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Rafael J . Wysocki 
Cc: Thomas Gleixner 
Link: http://lkml.kernel.org/r/1436192944-56496-2-git-send-email-andriy.shevchenko@linux.intel.com
Signed-off-by: Ingo Molnar

x86: pmc_atom: Expose contents of PSS

2015-01-20T11:50:14+00:00

The PSS register reflects the power state of each island on SoC. It would be
useful to know which of the islands is on or off at the momemnt.

Signed-off-by: Andy Shevchenko 
Acked-by: Aubrey Li 
Cc: Rafael J. Wysocki 
Cc: Kumar P. Mahesh 
Link: http://lkml.kernel.org/r/1421253575-22509-6-git-send-email-andriy.shevchenko@linux.intel.com
Signed-off-by: Thomas Gleixner

x86: pmc_atom: Clean up init function

2015-01-20T11:50:14+00:00

There is no need to use err variable.

Signed-off-by: Andy Shevchenko 
Acked-by: Aubrey Li 
Cc: Rafael J. Wysocki 
Cc: Kumar P. Mahesh 
Link: http://lkml.kernel.org/r/1421253575-22509-5-git-send-email-andriy.shevchenko@linux.intel.com
Signed-off-by: Thomas Gleixner

x86: pmc-atom: Remove unused macro

2015-01-20T11:50:14+00:00

DRIVER_NAME seems unused. This patch just removes it. There is no functional
change.

Signed-off-by: Andy Shevchenko 
Cc: Aubrey Li 
Cc: Rafael J. Wysocki 
Cc: Kumar P. Mahesh 
Link: http://lkml.kernel.org/r/1421253575-22509-4-git-send-email-andriy.shevchenko@linux.intel.com
Signed-off-by: Thomas Gleixner

x86: pmc_atom: don%27t check for NULL twice

2015-01-20T11:50:14+00:00

debugfs_remove_recursive() is NULL-aware, thus, we may safely remove the check
here. There is no need to assing NULL to variable since it will be not used
anywhere.

Signed-off-by: Andy Shevchenko 
Acked-by: Aubrey Li 
Cc: Rafael J. Wysocki 
Cc: Kumar P. Mahesh 
Link: http://lkml.kernel.org/r/1421253575-22509-3-git-send-email-andriy.shevchenko@linux.intel.com
Signed-off-by: Thomas Gleixner

x86: pmc-atom: Assign debugfs node as soon as possible

2015-01-20T11:50:14+00:00

pmc_dbgfs_unregister() will be called when pmc->dbgfs_dir is unconditionally
NULL on error path in pmc_dbgfs_register(). To prevent this we move the
assignment to where is should be.

Fixes: f855911c1f48 (x86/pmc_atom: Expose PMC device state and platform sleep state)
Reported-by: Thomas Gleixner 
Signed-off-by: Andy Shevchenko 
Cc: Aubrey Li 
Cc: Rafael J. Wysocki 
Cc: Kumar P. Mahesh 
Link: http://lkml.kernel.org/r/1421253575-22509-2-git-send-email-andriy.shevchenko@linux.intel.com
Signed-off-by: Thomas Gleixner