2011/5/25 Mika Westerberg <[email protected]>: > I re-checked the specs and indeed, as discussed previously, it is clear that > Cirrus (or ARM) copied the interface from other. Even the wording in the > document is identical in many places. However, in ep93xx User's Guide, there > is no mention about SSP being AMBA PrimeCell peripheral. For UARTs it is > mentioned... go figure. > > There are differences also, some of the bits in control registers are in > different places. Interrupt registers are completely different and there is no > DMA control register at all. The same things we discussed before.
But it really does not matter. The amba-pl022.c driver has all the same deviations for things called "PL023" that are not pure PL022 either. I just made the driver a bit more flexible, supporting both. If the people doing drivers/usb/musb/* had done the same thing we would have had what, 5 drivers for similar hardware? > Back then, it wasn't known how the M2M DMA interface (the one used > by SSP and IDE) was going to be implemented. But I knew, having just written the needed extensions to dmaengine. And I said so. But I realize I'm maybe not considered an authoritative source on the subject, and I'm biased. > IMHO it is better to have ep93xx implementation on its own driver since it is > not a real AMBA PL022 peripheral but some weird hack made by Cirrus (although > my opinions are bit biased). I disagree because it's IMO at first sight no more deviant than our "PL023" variants that still use the same pl022 driver. Is there some inexepensive hardware with EP93xx I can get to fix this myself? Yours, Linus Walleij ------------------------------------------------------------------------------ vRanger cuts backup time in half-while increasing security. With the market-leading solution for virtual backup and recovery, you get blazing-fast, flexible, and affordable data protection. Download your free trial now. http://p.sf.net/sfu/quest-d2dcopy1 _______________________________________________ spi-devel-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/spi-devel-general
