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2011-04-20OMAP3: PM: Do not rely on ROM code to restore CM_AUTOIDLE_PLL.AUTO_PERIPH_DPLLEduardo Valentin
As per OMAP3 erratum (i671), ROM code adds extra latencies while restoring CM_AUTOIDLE_PLL register, if AUTO_PERIPH_DPLL is equal to 1. This patch stores 0's in scratchpad content area corresponding to AUTO_PERIPH_DPLL, to prevent ROM code to try to lock per DPLL, since it won't respect proper programing scheme. This register is then stored in prcm context. The saving and restore is now done by kernel side. Here follow the erratum description DESCRIPTION After OFF mode transition, among many restorations, the ROM Code restores the CM_AUTOIDLE_PLL register, and after that, it tries to relock the PER DPLL. In case the restoration data stored in scratchpad memory contains a field CM_AUTOIDLE_PLL.AUTO_PERIPH_DPLL = 1, then the way the ROM Code restores and locks the PER DPLL does not respect the PER DPLL programming scheme. In that case, the DPLL might not lock. Meanwhile, when trying to lock the PER DPLL, the ROM Code does not hang. Only extra latencies are introduced at wake-up. WORKAROUND When saving the context-restore structure in scratchpad memory, in order to respect the PER DPLL programming scheme, it is advised to store 0 in the CM_AUTOIDLE_PLL.AUTO_PERIPH_DPLL field of the saved structure. After wake-up, the application should store in CM_AUTOIDLE_PLL register the right desired value. Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com> Signed-off-by: Paul Walmsley <paul@pwsan.com>
2011-03-07OMAP2xxx: clock: add clockfw autoidle support for APLLsPaul Walmsley
OMAP2xxx devices have two on-chip APLLs. These APLLs can automatically enter idle when not in use. Connect the APLL autoidle code to the clock code, so that the clock framework can handle this process. As part of this patch, remove the code in mach-omap2/pm24xx.c that previously handled APLL autoidle control. Signed-off-by: Paul Walmsley <paul@pwsan.com> Cc: Kevin Hilman <khilman@ti.com> Tested-by: Rajendra Nayak <rnayak@ti.com> Reviewed-by: Kevin Hilman <khilman@ti.com>
2011-03-07OMAP2: clock: add DPLL autoidle supportPaul Walmsley
Add the necessary code and data to allow the clock framework to enable and disable the OMAP2 DPLL autoidle state. This is so the direct register access can be moved out of the mach-omap2/pm24xx.c code, and other code that needs to control this (e.g., CPUIdle) can do so via an API. As part of this patch, remove the pm24xx.c code that formerly wrote directly to the autoidle bits. Signed-off-by: Paul Walmsley <paul@pwsan.com> Cc: Kevin Hilman <khilman@ti.com> Tested-by: Rajendra Nayak <rnayak@ti.com> Reviewed-by: Kevin Hilman <khilman@ti.com>
2010-12-21OMAP2/3: clockdomain: remove unneeded .clkstctrl_reg, remove some direct CM ↵Paul Walmsley
register accesses Reverse some of the effects of commit 84c0c39aec31a09571fc08a752a2f4da0fe9fcf2 ("ARM: OMAP4: PM: Make OMAP3 Clock-domain framework compatible for OMAP4"). On OMAP2/3, the CM_CLKSTCTRL register is at a constant offset from the powerdomain's CM instance. Also, remove some of the direct CM register access from the clockdomain code, moving it to the OMAP2/3 CM code instead. The intention here is to simplify the clockdomain code. (The long-term goal is to move all direct CM register access across the OMAP core code to the appropriate cm*.c file.) Signed-off-by: Paul Walmsley <paul@pwsan.com> Tested-by: Rajendra Nayak <rnayak@ti.com> Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
2010-12-21OMAP2/3: PRM/CM: prefix OMAP2 PRM/CM functions with "omap2_"Paul Walmsley
Now that OMAP4-specific PRCM functions have been added, distinguish the existing OMAP2/3-specific PRCM functions by prefixing them with "omap2_". This patch should not result in any functional change. Signed-off-by: Paul Walmsley <paul@pwsan.com> Cc: Kevin Hilman <khilman@deeprootsystems.com> Cc: Jarkko Nikula <jhnikula@gmail.com> Cc: Peter Ujfalusi <peter.ujfalusi@nokia.com> Cc: Liam Girdwood <lrg@slimlogic.co.uk> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Tested-by: Rajendra Nayak <rnayak@ti.com>
2010-12-21OMAP3: PRM/CM: separate CM context save/restore; remove PRM context save/restorePaul Walmsley
The OMAP3 PRM module is in the WKUP powerdomain, which is always powered when the chip is powered, so it shouldn't be necessary to save and restore those PRM registers. Remove the PRM register save/restore code, which should save several microseconds during off-mode entry/exit, since PRM register accesses are relatively slow. While doing so, move the CM register save/restore code into CM-specific code. The CM module has been distinct from the PRM module since 2430. This patch includes some minor changes to pm34xx.c. Signed-off-by: Paul Walmsley <paul@pwsan.com> Cc: Kevin Hilman <khilman@deeprootsystems.com> Cc: Rajendra Nayak <rnayak@ti.com> Cc: Tero Kristo <tero.kristo@nokia.com> Cc: Kalle Jokiniemi <kalle.jokiniemi@digia.com> Reviewed-by: Kevin Hilman <khilman@deeprootsystems.com> Tested-by: Kevin Hilman <khilman@deeprootsystems.com> Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Tested-by: Rajendra Nayak <rnayak@ti.com>
2010-12-21OMAP2/3: PRCM: split OMAP2/3-specific PRCM code into OMAP2/3-specific filesPaul Walmsley
In preparation for adding OMAP4-specific PRCM accessor/mutator functions, split the existing OMAP2/3 PRCM code into OMAP2/3-specific files. Most of what was in mach-omap2/{cm,prm}.{c,h} has now been moved into mach-omap2/{cm,prm}2xxx_3xxx.{c,h}, since it was OMAP2xxx/3xxx-specific. This process also requires the #includes in each of these files to be changed to reference the new file name. As part of doing so, add some comments into plat-omap/sram.c and plat-omap/mcbsp.c, which use "sideways includes", to indicate that these users of the PRM/CM includes should not be doing so. Thanks to Felipe Contreras <felipe.contreras@gmail.com> for comments on this patch. Signed-off-by: Paul Walmsley <paul@pwsan.com> Cc: Jarkko Nikula <jhnikula@gmail.com> Cc: Peter Ujfalusi <peter.ujfalusi@nokia.com> Cc: Liam Girdwood <lrg@slimlogic.co.uk> Cc: Omar Ramirez Luna <omar.ramirez@ti.com> Acked-by: Omar Ramirez Luna <omar.ramirez@ti.com> Cc: Felipe Contreras <felipe.contreras@gmail.com> Acked-by: Felipe Contreras <felipe.contreras@gmail.com> Cc: Greg Kroah-Hartman <greg@kroah.com> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Reviewed-by: Kevin Hilman <khilman@deeprootsystems.com> Tested-by: Kevin Hilman <khilman@deeprootsystems.com> Tested-by: Rajendra Nayak <rnayak@ti.com> Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>