No DMA RX on some BCM4321, on BCM43224 and BCM43225

[Rafał Miłecki]

W dniu 19 lipca 2011 00:59 użytkownik Michael Büsch <m at bues.ch> napisał:
> On Tue, 19 Jul 2011 00:39:10 +0200
> Rafał Miłecki <zajec5 at gmail.com> wrote:
>
>> W dniu 18 lipca 2011 22:41 użytkownik Michael Büsch <m at bues.ch> napisał:
>> > On Mon, 18 Jul 2011 22:14:50 +0200
>> > Rafał Miłecki <zajec5 at gmail.com> wrote:
>> >
>> >> When using DMA on one of my BCM4321s and BCM43224 or BCM43225 I don't
>> >> get a single RX IRQ.
>> >>
>> >> Doing scanning requests sends TX packets to the hardware, and the
>> >> ucode generates IRQs for confirming transmitted packets. RX does not
>> >> seem to work however. I expected to see "native" beacons, or response
>> >> to the scanning request.
>> >>
>> >> Do you have idea what may be wrong, where should I look at?
>> >
>> > Is wl still using the same dma engine for
>> > RX as older versions did? (what was it? the first?)
>>
>> Yes. That's what wl does:
>>
>> 1) Disabling DMA engines (RX part)
>> write32 0xfaafc220 <- 0x00000000
>>  read32 0xfaafc230 -> 0x00000000
>>
>> 2) Enabling DMA engines (RX part)
>>  read32 0xfaafc220 -> 0x00000040
>> write32 0xfaafc220 <- 0x0000084d CTL: [38 << 1 (OFFSET) | 0x1 (EN) |
>> 0x800 (PARITY)]
>> write32 0xfaafc228 <- 0x18948000 LO: [lo addr & ~routing_bits]
>> write32 0xfaafc22c <- 0x80000000 HI: [routing & ~ROUT_MASK | routing]
>>
>> (improved) b43 does:
>>
>> write32 0xfaafc220 <- 0x0000084d CTL
>> write32 0xfaafc228 <- 0x17b70000 LO
>> write32 0xfaafc22c <- 0x80000000 HI
>> write32 0xfaafc224 <- 0x00000400 STOP IDX
>
> What about the DMA interrupt masks?

Well, in b43 we ask for all IRQs:
b43_write32(dev, B43_MMIO_GEN_IRQ_REASON, B43_IRQ_ALL);
write32 0xfaafc128 <- 0xffffffff

wl also does:
write32 0xfaafc128 <- 0xffffffff

(All the dumps I provide in this thread come from BCM43224)

-- 
Rafał