Boot tested on omap 3430 and 3630, functionality on iva2 only. Introduced hwmod data and support for omap3 (iva2 mmu & isp mmu) and omap4 (ducati mmu & tesla mmu). Minor cleanup due to this changes. There is an issue (present without patches too): Doing a cycle of insmod-rmmod to iommu module and then full insmod of bridgedriver (with all dependencies) causes the next read of iommu registers to dump an unhandled fault log; this, because when rmmod of iommu is called it tries to clean the iommu tables and flush any old entry prior to removing the driver, however these reads/writes are attempted while the MMU is under reset and will timeout on the L3 IVA target agent, which will leave MMU unusable until the proper restore sequence to clear this L3 error is executed. Fix would be to move page table allocation to iommu get and its correspondent free to iommu put, however it will fall entirely under iommu user responsibility, as it needs to clear the mmu reset bit, before calling iommu functions that read/write into mmu registers (which should apply only for first boot or on baseimage reload); trading this restriction in order to keep the same generic iommu code for all omap iommu devices. This issue has been seen on omap3 iva2 mmu, same restriction should apply for tesla mmu. For discussion: should iommu handle mmu reset source directly? This register is grouped into an IVA PRM register which handles sequencer, iva2 mmu and dsp resets. As mentioned iommu handles cam, iva2 mmu (OMAP3) and tesla, ducati mmu (OMAP4), only tesla and iva2 should suffer from this restriction and according changes should be needed to handle both cases on mach-omap2 code. This also affects hwmod, since, if defined, it tries to read SYSC registers at boot time when registering the hwmod and causing the same issue. Omar Ramirez Luna (6): omap: iommu: remove redundant clock usage OMAP3: hwmod data: Add mmu for iva2 and isp OMAP4: hwmod data: add mmu hwmod for ducati and tesla omap: iommu: intial hwmod support omap: iommu: hwmod device enable/disable routines omap: iommu: code reorganization and cleanup arch/arm/mach-omap2/omap-iommu.c | 168 +++++++++------------------- arch/arm/mach-omap2/omap_hwmod_3xxx_data.c | 103 +++++++++++++++++ arch/arm/mach-omap2/omap_hwmod_44xx_data.c | 105 +++++++++++++++++ arch/arm/plat-omap/include/plat/iommu.h | 19 +++- arch/arm/plat-omap/include/plat/omap34xx.h | 2 + arch/arm/plat-omap/iommu.c | 64 ++++------- 6 files changed, 299 insertions(+), 162 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
