Due to an OMAP3 errata (1.142), on HS/EMU devices SDRC should be
programed to issue automatic self refresh on timeout
of AUTO_CNT = 1 prior to any transition to OFF mode.
This is needed only on sil rev's ES3.0 and above.

This patch enables the above needed WA in the SDRC power register
value stored in scratchpad, so that ROM code restores this value
in SDRC POWER on the wakeup path.
The original SDRC POWER register value is stored and restored back
in omap_sram_idle() function.

This fixes some random crashes observed while stressing suspend
on HS/EMU devices.
Signed-off-by: NRajendra Nayak <rnayak@ti.com>
Signed-off-by: NKalle Jokiniemi <kalle.jokiniemi@digia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

OMAP 3430 ES3.1 chips have a separate bit for IO daisy-chain
wake up enabling. It needs to be enabled when entering
retention or off state, otherwise waking up might not work
in all situations.
Signed-off-by: NKalle Jokiniemi <kalle.jokiniemi@digia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

MPU and CORE should stay awake if there is CAM domain ACTIVE. This is
because that module doesn't have wake-up capability.

This should replace the patch that is currently in the PM branch.
Signed-off-by: NJouni Hogander <jouni.hogander@nokia.com>
Signed-off-by: NTero Kristo <tero.kristo@nokia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

OMAP3 can't generate wakeups in this state, thus it is not permitted.
Signed-off-by: NTero Kristo <tero.kristo@nokia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

Using debugfs, export a configurable wakeup timer to be used to
wakeup system from suspend.

If a non-zero value is written to
/debug/pm_debug/wakeup_timer_seconds, A timer wakeup event will wake
the system and resume after the configured number of seconds.
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

Allow enable/disable of low-power states during idle.  To
enable low-power idle:

   echo 1 > /debug/pm_debug/sleep_while_idle

 to disable:

   echo 0 > /debug/pm_debug/sleep_while_idle

Also allow enable/disable of OFF-mode.  To enable:

   echo 1 > /debug/pm_debug/enable_off_mode

 to disable:

   echo 0 > /debug/pm_debug/enable_off_mode
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

This patch improves the wakeup SRAM code polling the SDRC to become ready
instead of just waiting for a fixed amount of time.
Signed-off-by: NPeter 'p2' De Schrijver <peter.de-schrijver@nokia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

The hardware SAVEANDRESTORE mechanism seems to leave
USB HOST power domain permanently into active state
after one transition from off to active state.
Disabling for now.
Signed-off-by: NKalle Jokiniemi <ext-kalle.jokiniemi@nokia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

Wrong index was used for ILR.
Signed-off-by: NAaro Koskinen <Aaro.Koskinen@nokia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

Errata: ES3.0, ES3.1 SDRC not sending auto-refresh when OMAP wakes-up
from OFF mode
Signed-off-by: NTero Kristo <tero.kristo@nokia.com>
Signed-off-by: NKalle Jokiniemi <kalle.jokiniemi@digia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

The reboot mode can be communicated to a bootloader (or the
kernel itself) with a scratchpad register. This functionality
is especially useful, if userspace is allowed to change
the reboot mode.
Signed-off-by: NJuha Yrjola <juha.yrjola@solidboot.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

Clear DMA channel states so that users can assume a known initial
state.
Signed-off-by: NAaro Koskinen <aaro.koskinen@nokia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

The CM_CLKEN_PLL register saved in scratchpad memory
was wrongly using offset of 0x0004 instead of 0x0000.

The effect of this was that boot ROM code would
restore the wrong value when waking up from off mode.
This wrong value, however, will be overwritten by
prcm context restore. Still, a short period of wrong
clock settings in CM_CLKEN_PLL remained between ROM
code and prcm context restore. This is fixed by the
patch.

Problem reported by: Jouni Hogander <jouni.hogander@nokia.com>
Signed-off-by: NKalle Jokiniemi <kalle.jokiniemi@digia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

The SMS_SYSCONFIG register gets reset in off mode, added a
save/restore mechanism for that.
Signed-off-by: NKalle Jokiniemi <kalle.jokiniemi@digia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

The secure sram context save uses dma channels 0 and 1.
In order to avoid collision between kernel DMA transfers and
ROM code dma transfers, we need to reserve DMA channels 0
1 on high security devices.

A bug in ROM code leaves dma irq status bits uncleared.
Hence those irq status bits need to be cleared when restoring
DMA context after off mode.

There was also a faulty parameter given to PPA in the secure
ram context save assembly code, which caused interrupts to
be enabled during secure ram context save. This caused the
save to fail sometimes, which resulted the saved context
to be corrupted, but also left DMA channels in secure mode.
The secure mode DMA channels caused "DMA secure error with
device 0" errors to be displayed.
Signed-off-by: NKalle Jokiniemi <kalle.jokiniemi@digia.com>
Signed-off-by: NJouni Hogander <jouni.hogander@nokia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

CM_CLKSEL1_PLL_IVA2 is not saved/restored currently. This patch is
adding save and restore for it.
Signed-off-by: NJouni Hogander <jouni.hogander@nokia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

Fix for ES3.0 bug: SDRC not sending auto-refresh when OMAP wakes-up
from OFF mode (warning for HS devices.)
Signed-off-by: NTero Kristo <tero.kristo@nokia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

The function omap3_save_secure_ram() is now called only once during
the initialization of the device and consequent sleep cycles will
re-use the same saved contents for secure RAM. Users who need secure
services should do secure RAM saving before entering off-mode, if a
secure service has been accessed after last save.

There are both latency and reliability issues with saving secure RAM
context in the idle path. The context save uses a hardware resource
which takes an order of hundreds of milliseconds to initialize after a
wake up from off-mode, and also there is no way of checking whether it
is ready from kernel side or not. It just crashes if you use it too
quickly

Additional fix to ensure scratchpad save is done after secure
RAM by Roger Quadros.
Signed-off-by: NTero Kristo <tero.kristo@nokia.com>
Signed-off-by: NRoger Quadros <ext-roger.quadros@nokia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

For HS/EMU devices, some additional resources need to be
saved/restored for off-mode support.  Namely, saving the secure RAM
and a pointer to it in the scratchpad.
Signed-off-by: NTero Kristo <tero.kristo@nokia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

For HS/EMU devices, these additional features are also used:

- DMA interrupt disable routine added
- Added DMA controller reset to DMA context restore
Signed-off-by: NTero Kristo <tero.kristo@nokia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

Add context save and restore for CORE powerdomain resources in order
to support off-mode.
Signed-off-by: NRajendra Nayak <rnayak@ti.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

Adds a 'save_state' option when calling into SRAM idle function
and adds some minor cleanups of SRAM asm code.
Signed-off-by: NRajendra Nayak <rnayak@ti.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

During the MMU restoration on the restore path from MPU OFF, the page
table entry for the page consisting of the code being executed is
modified to make MMU return VA=PA.

The MMU is then enabled and the original entry is being stored in
scratchpad.  This patch reads the original values stored in
scratchpad, and restores them back.
Signed-off-by: NRajendra Nayak <rnayak@ti.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

Expand the powerdomains handled in the idle path to include PER, NEON
and CORE.  This includes properly clearing the previous powerstates,
linking NEON state to MPU state and calling the UART prepare functions
for only the appropraite powerdomain transitions (CORE for UART1,2,
PER for UART3.)
Signed-off-by: NRajendra Nayak <rnayak@ti.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

Generalize the copy of SRAM functions into omap_push_sram_idle()
so it can be used on init but also after off-mode transitions.
Signed-off-by: NRajendra Nayak <rnayak@ti.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

Add context save and restore for the System Control Module to suport
off-mode.

ETK and debobs definitions added by Peter De Schrijver.
Signed-off-by: NRajendra Nayak <rnayak@ti.com>
Signed-off-by: NPeter 'p2' De Schrijver <peter.de-schrijver@nokia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

This patch populates the scratchpad contents as expected by the
bootROM code.
Signed-off-by: NRajendra Nayak <rnayak@ti.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

Add context save and restore for PRCM module to support off-mode.
Additional registers (CM_CLKSEL4, CM_CLKEN, CM_CLKEN2) added by Tero
Kristo.

Missing CM_CLKEN_PLL_IVA2 register added by Kalle Jokiniemi.
Signed-off-by: NRajendra Nayak <rnayak@ti.com>
Signed-off-by: NTero Kristo <tero.kristo@nokia.com>
Signed-off-by: NKalle Jokiniemi <kalle.jokiniemi@digia.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

Add context save and restore for the INTC module to support off-mode.
Signed-off-by: NRajendra Nayak <rnayak@ti.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

Add context save and restore to enable off-mode.
Signed-off-by: NRajendra Nayak <rnayak@ti.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

This patch adds the context save and restore functions for GPMC to
enable off-mode.
Signed-off-by: NRajendra Nayak <rnayak@ti.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

* 'for-linus' of git://github.com/at91linux/linux-2.6-at91:
  at91: at91sam9g45 family: identify several chip versions
  avr32: add two new at91 to cpu.h definition

cpu_is_xxx() macros are identifying generic at91sam9g45 chip. This patch adds
the capacity to differentiate Engineering Samples and final lots through the
inclusion of  at91_cpu_fully_identify() and the related chip IDs with chip
version field preserved.
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: NJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: NHans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>

Somme common drivers will need those at91 cpu_is_xxx() definitions. As
at91sam9g10 and at91sam9g45 are on the way to linus' tree, here is the patch
that adds those chips to cpu.h in AVR32 architecture.
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: NHaavard Skinnemoen <haavard.skinnemoen@atmel.com>

* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus: (38 commits)
  MIPS: O32: Fix ppoll
  MIPS: Oprofile: Rename cpu_type from godson2 to loongson2
  MIPS: Alchemy: Fix hang with high-frequency edge interrupts
  MIPS: TXx9: Fix spi-baseclk value
  MIPS: bcm63xx: Set the correct BCM3302 CPU name
  MIPS: Loongson 2: Set cpu_has_dc_aliases and cpu_icache_snoops_remote_store
  MIPS: Avoid potential hazard on Context register
  MIPS: Octeon: Use lockless interrupt controller operations when possible.
  MIPS: Octeon: Use write_{un,}lock_irq{restore,save} to set irq affinity
  MIPS: Set S-cache linesize to 64-bytes for MTI's S-cache
  MIPS: SMTC: Avoid queing multiple reschedule IPIs
  MIPS: GCMP: Avoid accessing registers when they are not present
  MIPS: GIC: Random fixes and enhancements.
  MIPS: CMP: Fix memory barriers for correct operation of amon_cpu_start
  MIPS: Fix abs.[sd] and neg.[sd] emulation for NaN operands
  MIPS: SPRAM: Clean up support code a little
  MIPS: 1004K: Enable SPRAM support.
  MIPS: Malta: Enable PCI 2.1 compatibility in PIIX4
  MIPS: Kconfig: Fix duplicate default value for MIPS_L1_CACHE_SHIFT.
  MIPS: MTI: Fix accesses to device registers on MIPS boards
  ...

* 'pm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6:
  PM: Remove some debug messages producing too much noise
  PM: Fix warning on suspend errors
  PM / Hibernate: Add newline to load_image() fail path
  PM / Hibernate: Fix error handling in save_image()
  PM / Hibernate: Fix blkdev refleaks
  PM / yenta: Split resume into early and late parts (rev. 4)

nr_processes() returns the sum of the per cpu counter process_counts for
all online CPUs. This counter is incremented for the current CPU on
fork() and decremented for the current CPU on exit(). Since a process
does not necessarily fork and exit on the same CPU the process_count for
an individual CPU can be either positive or negative and effectively has
no meaning in isolation.

Therefore calculating the sum of process_counts over only the online
CPUs omits the processes which were started or stopped on any CPU which
has since been unplugged. Only the sum of process_counts across all
possible CPUs has meaning.

The only caller of nr_processes() is proc_root_getattr() which
calculates the number of links to /proc as
        stat->nlink = proc_root.nlink + nr_processes();

You don't have to be all that unlucky for the nr_processes() to return a
negative value leading to a negative number of links (or rather, an
apparently enormous number of links). If this happens then you can get
failures where things like "ls /proc" start to fail because they got an
-EOVERFLOW from some stat() call.

Example with some debugging inserted to show what goes on:
        # ps haux|wc -l
        nr_processes: CPU0:     90
        nr_processes: CPU1:     1030
        nr_processes: CPU2:     -900
        nr_processes: CPU3:     -136
        nr_processes: TOTAL:    84
        proc_root_getattr. nlink 12 + nr_processes() 84 = 96
        84
        # echo 0 >/sys/devices/system/cpu/cpu1/online
        # ps haux|wc -l
        nr_processes: CPU0:     85
        nr_processes: CPU2:     -901
        nr_processes: CPU3:     -137
        nr_processes: TOTAL:    -953
        proc_root_getattr. nlink 12 + nr_processes() -953 = -941
        75
        # stat /proc/
        nr_processes: CPU0:     84
        nr_processes: CPU2:     -901
        nr_processes: CPU3:     -137
        nr_processes: TOTAL:    -954
        proc_root_getattr. nlink 12 + nr_processes() -954 = -942
          File: `/proc/'
          Size: 0               Blocks: 0          IO Block: 1024   directory
        Device: 3h/3d   Inode: 1           Links: 4294966354
        Access: (0555/dr-xr-xr-x)  Uid: (    0/    root)   Gid: (    0/    root)
        Access: 2009-11-03 09:06:55.000000000 +0000
        Modify: 2009-11-03 09:06:55.000000000 +0000
        Change: 2009-11-03 09:06:55.000000000 +0000

I'm not 100% convinced that the per_cpu regions remain valid for offline
CPUs, although my testing suggests that they do. If not then I think the
correct solution would be to aggregate the process_count for a given CPU
into a global base value in cpu_down().

This bug appears to pre-date the transition to git and it looks like it
may even have been present in linux-2.6.0-test7-bk3 since it looks like
the code Rusty patched in http://lwn.net/Articles/64773/ was already
wrong.
Signed-off-by: NIan Campbell <ian.campbell@citrix.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>