Hi Manjunath, On Sunday 06 March 2011 16:36:05 Manjunath Hadli wrote: > Introduction > ------------ > This is the proposal of the initial version of design and implementation > of the Davinci family (dm644x,dm355,dm365)VPFE (Video Port Front End) > drivers using Media Controloler , the initial version which supports > the following: > 1) dm365 vpfe > 2) ccdc,previewer,resizer,h3a,af blocks > 3) supports only continuous mode and not on-the-fly > 4) supports user pointer exchange and memory mapped modes for buffer > allocation > > This driver bases its design on Laurent Pinchart's Media Controller Design > whose patches for Media Controller and subdev enhancements form the base. > The driver also takes copious elements taken from Laurent Pinchart and > others' OMAP ISP driver based on Media Controller. So thank you all the > people who are responsible for the Media Controller and the OMAP ISP > driver. You're welcome :-) > Also, the core functionality of the driver comes from the arago vpfe > capture driver of which the CCDC capture was based on V4L2, with other > drivers like Previwer, Resizer and other being individual character > drivers. The CCDC, preview and resizer modules look very similar to their OMAP3 counterparts. I think we should aim at sharing code between the drivers. It's hard enough to develop, review and maintain one driver, let's not duplicate the effort. > The current driver caters to dm6446,dm355 and dm365 of which the current > implementation works for dm365. The three VPFE IPs have some common > elements in terms of some highe level functionality but there are > differences in terms of register definitions and some core blocks. > > The individual specifications for each of these can be found here: > dm6446 vpfe: http://www.ti.com/litv/pdf/sprue38h > dm355 vpfe: http://www.ti.com/litv/pdf/spruf71a > dm365 vpfe: http://www.ti.com/litv/pdf/sprufg8c > > The initial version of the driver implementation can be found here: > > http://git.linuxtv.org/mhadli/v4l-dvb-davinci_devices.git?a=shortlog;h=refs > /heads/mc_release > > Driver Design: Main entities > ---------------------------- > The hardware modules for dm355,dm365 are mainly ipipe, ipipeif,isif. These > hardware modules are generically exposed to the user level in the for of > dm6446 style modules. Mainly - > ccdc, previewer, resizer in addition to the other histogram and > auto color/white balance correction and auto focus modules. > > 1)MT9P031 sensor module for RAW capture > 2)TVP7002 decoder module for HD inputs > 3)TVP514x decoder module for SD inputs > 4)CCDC capture module > 5)Previewer Module for Bayer to YUV conversion > 6)Resizer Module for scaling > > > Connection for on-the-fly capture > --------------------------------- > Mt9P031 ------>CCDC--->Previewer(optional)--->Resizer(optional)--->Video > > TVP7002 --- > > TV514x --- > > File Organisation > ----------------- > > main driver files > ---------------- > drivers/media/video/davinci/vpfe_capture.c > include/media/davinci/vpfe_capture.h > > Instantiatiation of the v4l2 device, media device and all subdevs from > here. > > video Interface files > --------------------- > drivers/media/video/davinci/vpfe_video.c > include/media/davinci/vpfe_video.h > > Implements all the v4l2 video operations with a generic implementation for > continuous and one shot mode. > > subdev interface files > ---------------------- > These file implement the subdev interface functionality for > each of the subdev entities - mainly the entry points and their > implementations in a IP generic way. > > drivers/media/video/davinci/vpfe_ccdc.c > drivers/media/video/davinci/vpfe_previewer.c > drivers/media/video/davinci/vpfe_resizer.c > drivers/media/video/davinci/vpfe_af.c > drivers/media/video/davinci/vpfe_aew.c > drivers/media/video/tvp514x.c > drivers/media/video/tvp7002.c > drivers/media/video/ths7353.c > > include/media/davinci/vpfe_ccdc.h > include/media/davinci/vpfe_previewer.h > include/media/davinci/vpfe_resizer.h > include/media/davinci/vpfe_af.h > include/media/davinci/vpfe_aew.h > include/media/tvp514x.h > drivers/media/video/tvp514x_regs.h > include/media/tvp7002.h > drivers/media/video/tvp7002_reg.h > > core implementation files > ------------------------- > These provide a core implementation routines for ccdc, ipipeif, > ipipe,aew, af, resizer hardware modules. > > drivers/char/imp_common.c > drivers/media/video/davinci/dm365_ccdc.c > drivers/media/video/davinci/dm355_ccdc.c > drivers/media/video/davinci/dm644x_ccdc.c > drivers/char/dm355_ipipe.c > drivers/char/dm355_ipipe_hw.c > drivers/char/dm355_def_para.c > drivers/char/dm365_ipipe.c > drivers/char/dm365_def_para.c > drivers/char/dm365_ipipe_hw.c > drivers/char/dm6446_imp.c > drivers/char/davinci_resizer_hw.c > drivers/char/dm3xx_ipipe.c > drivers/media/video/davinci/dm365_aew.c > drivers/media/video/davinci/dm365_af.c > drivers/media/video/davinci/dm365_a3_hw.c > drivers/media/video/davinci/dm355_aew.c > drivers/media/video/davinci/dm355_af.c > drivers/media/video/davinci/dm355_aew_hw.c > drivers/media/video/davinci/dm355_af_hw.c > > include/media/davinci/imp_common.h > include/media/davinci/dm365_ccdc.h > include/media/davinci/dm355_ccdc.h > include/media/davinci/dm644x_ccdc.h > include/media/davinci/dm355_ipipe.h > include/media/davinci/dm365_ipipe.h > include/media/davinci/imp_hw_if.h > include/media/davinci/dm3xx_ipipe.h > include/media/davinci/dm365_aew.h > include/media/davinci/dm365_af.h > include/media/davinci/dm365_a3_hw.h > include/media/davinci/dm355_aew.h > include/media/davinci/dm355_af.h > include/media/davinci/dm355_aew_hw.h > include/media/davinci/dm355_af_hw.h > include/media/davinci/vpfe_types.h > > drivers/media/video/davinci/dm365_ccdc_regs.h > drivers/media/video/davinci/dm355_ccdc_regs.h > drivers/media/video/davinci/dm644x_ccdc_regs.h > drivers/media/video/davinci/ccdc_hw_device.h > drivers/char/dm355_ipipe_hw.h > drivers/char/dm355_def_para.h > drivers/char/dm365_def_para.h > drivers/char/dm365_ipipe_hw.h > drivers/char/davinci_resizer_hw.h > > TODOs: > ====== > 1. Single shot implementation for previewer and resizer. > 2. Seperation of v4l2 video related structures and routines to aid single > shot implementation. > 3. Support NV12 format > 4. Move the files from char folder to drivers/media/video along with > headers Why are the drivers in drivers/char for ? > 5. Make the aew and af headers common between dm355 and dm365. > 6. Enable dm355 and dm6446 functionality by making appropriate platform > changes -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
