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Subject[PATCH v9 00/25] gpio/omap: driver cleanup and fixes
Date
The following changes since commit 62aa2b537c6f5957afd98e29f96897419ed5ebab:
Linus Torvalds (1):
Linux 3.3-rc2

are available in the git repository at:
http://gitorious.org/~tarunkanti/omap-sw-develoment/tarunkantis-linux-omap-dev
Branch: for_3.4/gpio_cleanup_fixes_v9

This series is continuation of cleanup of OMAP GPIO driver and fixes.
The cleanup include getting rid of cpu_is_* checks wherever possible,
use of gpio_bank list instead of static array, use of unique platform
specific value associated data member to OMAP platforms to avoid
cpu_is_* checks. The series also include PM runtime support.

Power Tests
a) OMAP3430SDP
- Modify board-3430sdp.c file to have multiple GPIO modules active
with debounce timeout enabled.
- Enable CPU-Idle
- Enable UART timeouts
- Enable offmode
- echo mem > /sys/power/state
- Verify retention and offmode count increment

Used following patches to avoid exception during system suspend:-
[PATCH RFC 1/2] mtd : Prevent the NULL pointer access
[PATCH RFC 2/2] mtd : Make the mtd_suspend return 0 if the suspend is not implemented

# echo mem > /sys/power/state
[ 47.128021] PM: Syncing filesystems ... done.
[ 47.144104] Freezing user space processes ... (elapsed 0.01 seconds) done.
[ 47.168243] Freezing remaining freezable tasks ... (elapsed 0.02 seconds) don e.
[ 47.205139] Unable to handle kernel NULL pointer dereference at virtual addre ss 000000a0
[ 47.213317] pgd = deaac000
[ 47.216033] [000000a0] *pgd=9e932831, *pte=00000000, *ppte=00000000
[ 47.222381] Internal error: Oops: 17 [#1] SMP
[ 47.226745] Modules linked in:
[ 47.229827] CPU: 0 Not tainted (3.3.0-rc2-00031-g12c5c5c #235)
[ 47.236022] PC is at mtd_cls_suspend+0x8/0x20
[ 47.240386] LR is at mtd_cls_suspend+0x8/0x20
[ 47.244750] pc : [<c02e78f8>] lr : [<c02e78f8>] psr: a0000013
[ 47.244750] sp : dea1fe60 ip : 22222222 fp : c0ee7d40
[ 47.256256] r10: c0ee7cf0 r9 : 00000000 r8 : c02e78f0
[ 47.261474] r7 : 00000000 r6 : 00000000 r5 : 00000002 r4 : dea45800
[ 47.268005] r3 : deb4cac0 r2 : 00000000 r1 : 00000002 r0 : 00000000
[ 47.274536] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[ 47.281677] Control: 10c5387d Table: 9eaac019 DAC: 00000015
[ 47.287445] Process sh (pid: 1177, stack limit = 0xdea1e2f8)
[ 47.293090] Stack: (0xdea1fe60 to 0xdea20000)
[...]

b) ZOOM3
- Enable CPU-Idle
- Enable UART timeout
- echo mem > /sys/power/state
- Wakeup system using serial keyboard
- Verify retention count increment

Functional Tests
- Done on OMAP2430, OMAP3430SDP, ZOOM3, OMAP4430

Bootup Test
- Done on OMAP1710
Used following patch to fix OMAP1 build error:-
[PATCH] i2c: OMAP: Fix OMAP1 build error

v9:
- Summary of Comments/Issues fixed
* GPIO wakeup does not work

* Call debounce clock enable/disable functions from PM runtime callbacks.
This will avoid calling the functions from multiple places.

* Modify description of following patch to match latest changes.
gpio/omap: save and restore debounce registers.

* Use (bank->regs->set_dataout && bank->regs->clr_dataout) together instead
of using only one of them.

* Remove cpu_is_omapxxxx() checks from set_gpio_trigger().

* _gpio_dbck_enable() in runtime callback triggered from omap_gpio_request
does not enable dbck because dbck_enable_mask is not set at this point.

* Workaround associated with an errata got missed in v8. This has been
included.

v8:
- Remove PM_CONFIG macro around following assignment.
pdata->get_context_loss_count = omap_pm_get_dev_context_loss_count;

- Once pm_runtime is enabled there is no more need for calling the
omap_device_disable_idle_on_suspend(od).

- With pm_runtime, handling of clocks in Suspend is taken care of by
powerdomain hooks. So remove usage of *_runtime_put/get* from
suspend/resume hooks and Idle path.

- Add handling of debounce clocks along the Suspend and Idle paths.

- Remove [PATCH 04/24] gpio/omap: fix pwrdm_post_transition call sequence
from this series. This will be merged as part of power cleanup series.

- Remove [PATCH v7 20/26] gpio/omap: skip operations in runtime callbacks
The bank->mod_usage check in this patch is not needed any more because
they are now already being taken care in suspend/resume and Idle paths.

- Remove [PATCH v7 26/26] gpio/omap: add dbclk aliases for all gpio modules
This is already taken care in hwmod.

- Remove redundant blank line in
[PATCH v7 14/26] gpio/omap: remove unnecessary bit-masking for read access

- if (cpu_is_omap15xx() && (bank->method == METHOD_MPUIO))
- isr &= 0x0000ffff;

if (bank->level_mask)
level_mask = bank->level_mask & enabled;

v7:
- Use pm_runtime_put() instead of pm_runtime_put_sync_suspend()
- Keep *_runtime_get/put*() outside spinlock
- Remove additional checking of conditions in _restore_context()
From:
if (bank->regs->set_dataout && bank->regs->clear_dataout)
...
To:
if (bank->regs->set_dataout)
...

- Use SET_RUNTIME_PM_OPS and SET_SYSTEM_SLEEP_PM_OPS macros
- In [PATCH 19/25] gpio/omap: cleanup prepare_for_idle and resume_after_idle,
protect the bank data elements and register access using spinlock in
runtime_suspend/resume() callbacks.
This is because these callbacks run with interrupts enabled.
- Add dbclk aliases for all GPIO modules. Without this, GPIO modules were not
getting the correct clock handle to enable/disable debounec clock.
- Fix log comments on the following patches:
[PATCH 19/25] gpio/omap: cleanup prepare_for_idle and resume_after_idle
[PATCH 20/25] gpio/omap: skip operations in runtime callbacks
[PATCH 24/25] gpio/omap: restore OE only after setting the output level

v6:
- Save and restore debounce registers for proper driver operation.
- Restore interrupt enable after all configuration to avoid spurious interrupts.
- Restore dataout register before oe register.
- Restore dataout into dataout_set or dataout based upon the OMAP version.
- Change register name from wkup_status to wkup_en.
- Remove wrapper around omap_pm_get_dev_context_loss_count(). Use it directly.
Also, changed the signature of get_context_loss_count in pdata and bank structure
from int to u32.

- Use 'context' instead of 'ctx' for clarity wherever it is used.
- Merged two patches into one which are related to bank_is_mpuio() modification.
- Use shift operator instead of following:
+ .irqctrl = OMAP_MPUIO_GPIO_INT_EDGE / 2,

- Remove redundant check from the following
+ if (bank_is_mpuio(bank)) {
+ if (bank->regs->wkup_status) <--- redundant check
+ mpuio_init(bank);

- Change subject of following patch
[PATCH v5 15/22] gpio/omap: use readl in irq_handler for all access
into
[PATCH 14/25] gpio/omap: remove unnecessary bit-masking for read access

- Fix multi-line comments in
[PATCH v5 20/22] gpio/omap: cleanup prepare_for_idle and resume_after_idle

v5:
- Reduce runtime callback overhead when *_get/put_sync() called from probe()
and *_gpio_request/free().

- Dynamic context save within functions where context is modified instead of
saving all context within a common function.

- Removed call to mpuio_init() from omap_gpio_mod_init(). Both the functions are
called once during initialization in *_gpio_probe().
Call to omap_gpio_mod_init() has been removed from omap_gpio_request() on the
first access to gpio bank. One time initialization looks sufficient.

- In *_gpio_irq_handler() use *_put_sync_suspend() instead of *_put_sync().

- Removed hardcoding of OMAP16xx sysconfig register value and instead defined an
associated constant.

- Removed *_get_sync() call from *_gpio_suspend() and *_put_sync() call from
*_gpio_resume(). They got wrongly slipped into the code.

- Removed following redundant zero allocated initialization from mach-omap2/gpio.c
+ pdata->regs->irqctrl = 0;
+ pdata->regs->edgectrl1 = 0;
+ pdata->regs->edgectrl2 = 0;

- Removed following redundant code in gpio-omap.c
-#define bank_is_mpuio(bank) ((bank)->method == METHOD_MPUIO)

v4:
- since all accesses to registers are 4-byte aligned, removing special
checks and handling of 16 and 32-bit wide bank registers and instead
use 32-bit read/write access consistently.

- redundant usage of MOD_REG_BIT has been corrected and replaced with
_gpio_rmw().

- omap_gpio_mod_init() function has been simplified further using _gpio_rmw().

- sysconfig register offset specific to omap16xx has been removed along
with its usage.

- additional logic to skip from suspend/resume:

if (!bank->regs->wkup_status || !bank->suspend_wakeup)
return 0;

if (!bank->regs->wkup_status || !bank->saved_wakeup)
return 0;

- separated mpuio related changes into a different patch from the patch where
wakeup status register related changes are done.

- Incorrect replacement of !cpu_class_is_omap2() in gpio_irq_type()
corrected:
+ if (!bank->regs->leveldetect0 &&
+ (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
return -EINVAL;
v3:
- Avoid use of wkup_set and wkup_clear registers. Instead use wkup_status
register for all platforms. This is because on OMAP4 it is recommended
not to use them.

- Remove duplicate code in omap_gpio_mod_init() for handling the same for
32-bit and 16-bit GPIO bank widths. This is accomplished by having two
functions to handle each case while assiging a common function pointer
during initialization.

- Remove OMAP16xx specific one time initialization from omap_gpio_mod_init().
Move it inside omap16xx_gpio_init().

- Avoid usage of USHRT_MAX to indicate undefined values. Use 0 instead.

- In omap_gpio_suspend()/resume() functions remove code that checks
if the feature is supported. Instead, assign these functions to
struct platform_driver's suspend & resume function pointers for those
OMAP platforms whcih support this feature.

- Remove 'suspend_support' flag because it is redundant. Instead use
wkup_* registers to decode the same information.

- Restore context also when we don't know if the context is lost.

- Make omap_gpio_save_context() and omap_gpio_restore_context() static.

v2:
- Do special handling of non-wakeup GPIOs only on OMAP2420. Avoid this
handling on OMAP3430.
- Isolate cleanups and fixes into separate set of patches. Keep the cleanup
first followed by the fixes.
- Avoid calling omap_gpio_get_context_loss() directly and instead call it
through function pointer in pdata initialized during init.
- workaround_enabled flag is not longer needed and is removed.
- Call pwrdm_post_transition() before calling omap_gpio_resume_after_idle().
- In omap2_gpio_resume_after_idle() do context restore before handling
workaround.
- Use PM runtime framework.
- Modify register offset names to : wkup_status, wkup_clear, wkup_set.
Also use 'base + offset' for readibility in all relevant places.
- Remove unwanted messages from commit section like TODO, etc.


Charulatha V (8):
gpio/omap: remove dependency on gpio_bank_count
gpio/omap: use flag to identify wakeup domain
gpio/omap: make gpio_context part of gpio_bank structure
gpio/omap: make non-wakeup GPIO part of pdata
gpio/omap: avoid cpu checks during module ena/disable
gpio/omap: use pinctrl offset instead of macro
gpio/omap: remove bank->method & METHOD_* macros
gpio/omap: fix bankwidth for OMAP7xx MPUIO

Nishanth Menon (4):
gpio/omap: save and restore debounce registers
gpio/omap: enable irq at the end of all configuration in restore
gpio/omap: restore OE only after setting the output level
gpio/omap: handle set_dataout reg capable IP on restore

Tarun Kanti DebBarma (13):
gpio/omap: handle save/restore context in GPIO driver
gpio/omap: further cleanup using wkup_en register
gpio/omap: use level/edge detect reg offsets
gpio/omap: remove hardcoded offsets in context save/restore
gpio/omap: cleanup set_gpio_triggering function
gpio/omap: cleanup omap_gpio_mod_init function
gpio/omap: remove unnecessary bit-masking for read access
gpio/omap: use pm-runtime framework
gpio/omap: optimize suspend and resume functions
gpio/omap: cleanup prepare_for_idle and resume_after_idle
gpio/omap: fix debounce clock handling
gpio/omap: fix incorrect access of debounce module
gpio/omap: remove omap_gpio_save_context overhead

arch/arm/mach-omap1/gpio15xx.c | 7 +-
arch/arm/mach-omap1/gpio16xx.c | 47 ++-
arch/arm/mach-omap1/gpio7xx.c | 14 +-
arch/arm/mach-omap2/gpio.c | 36 +-
arch/arm/mach-omap2/pm34xx.c | 14 -
arch/arm/plat-omap/include/plat/gpio.h | 29 +-
drivers/gpio/gpio-omap.c | 1099 +++++++++++++-------------------
7 files changed, 549 insertions(+), 697 deletions(-)



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