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author | Mohan V <mohanv@ti.com> | 2012-06-22 08:40:02 -0600 |
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committer | Paul Walmsley <paul@pwsan.com> | 2012-06-22 08:40:02 -0600 |
commit | fe7ea0062f2f846bb68447c7b813b9230285dbeb (patch) | |
tree | b32c0698f2ea3a4d55c986638ab34d3205baefea /arch/arm/mach-omap2/prm2xxx_3xxx.h | |
parent | 75a4433e409b2d22cbe443b623d92047b59cbb9a (diff) | |
download | op-kernel-dev-fe7ea0062f2f846bb68447c7b813b9230285dbeb.zip op-kernel-dev-fe7ea0062f2f846bb68447c7b813b9230285dbeb.tar.gz |
ARM: OMAP3: PM: correct enable/disable of daisy io chain
Currently the enabling and disabling of IO Daisy chain is not
according to the TRM. The below steps are followed to enable/
disable the IO chain, based loosely on the "Sec 3.5.7.2.2
I/O Wake-Up Mechanism" section in OMAP3630 Public TRM[1].
Steps to enable IO chain:
[a] Set PM_WKEN_WKUP.EN_IO bit
[b] Set the PM_WKEN_WKUP.EN_IO_CHAIN bit
[c] Poll for PM_WKST_WKUP.ST_IO_CHAIN.
[d] When ST_IO_CHAIN bit set to 1, clear PM_WKEN_WKUP.EN_IO_CHAIN
[e] Clear ST_IO_CHAIN bit.
Steps to disable IO chain:
[a] Clear PM_WKEN_WKUP.EN_IO_CHAIN bit
[b] Clear PM_WKEN_WKUP.EN_IO bit
[c] Clear PM_WKST_WKUP.ST_IO bit by writing 1 to it.
Step [e] & [c] in each case can be skipped, as these are handled
by the PRCM interrupt handler later.
[1] http://focus.ti.com/pdfs/wtbu/OMAP36xx_ES1.x_PUBLIC_TRM_vV.zip
Signed-off-by: Mohan V <mohanv@ti.com>
Signed-off-by: Vishwanath BS <vishwanath.bs@ti.com>
[paul@pwsan.com: modified commit message to clarify that these steps are
based loosely on the TRM section, rather than documented exactly]
Reviewed-by: Rajendra Nayak <rnayak@ti.com>
[paul@pwsan.com: resolved new warnings from checkpatch]
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Diffstat (limited to 'arch/arm/mach-omap2/prm2xxx_3xxx.h')
0 files changed, 0 insertions, 0 deletions