Re: [PATCH 1/3] fpga manager: Add cyclonespi driver for Altera fpgas

From: Joshua Clayton
Date: Fri Oct 07 2016 - 16:54:19 EST

On 10/07/2016 11:21 AM, atull wrote:
> On Fri, 7 Oct 2016, Moritz Fischer wrote:
>>> +static inline u32 revbit8x4(u32 n)
>>> +{
>>> + n = ((n & 0xF0F0F0F0UL) >> 4) | ((n & 0x0F0F0F0FUL) << 4);
>>> + n = ((n & 0xCCCCCCCCUL) >> 2) | ((n & 0x33333333UL) << 2);
>>> + n = ((n & 0xAAAAAAAAUL) >> 1) | ((n & 0x55555555UL) << 1);
>>> + return n;
>>> +}
The real issue is that The FPGA wants lsb first, and my SPI driver
doesn't support it.
What I really wanted to do here was to get generic support for lsb-first
SPI into the SPI subsystem.
>> During the Zynq FPGA manager reviews we decided that manipulating the bitstream
>> to be consumable by the driver is userland's job.
> Moritz, Can you remind me what that issue was there (or point me to
> that email, I can't find it)? I don't think I had a problem with that
> in your case. In general I think if these drivers can take the
> bitstream that comes from the manufacturer's tools and stuff it into
> the FPGA, then we are accomplishing what we want. So I am OK with
> this here. The intent of the driver is to load a standard rbf, same
> as the other Altera FPGA drivers.
> There is a problem here though it will be easy to fix. This call to
> revbit8x4 should happen in cyclonespi_write(), not in
> cyclonespi_write_init(). The reason for that is that write_init() may
> just get the first chunk of the image (the header) and that write()
> will be called multiple times for the remaining chunks. The current
> FPGA manager API won't show this problem since you have to give
> fpga_mgr_buf_load the whole image buffer at once. But it is easy to
> imagine that some time in the future we may want to expand the FPGA
> manager API to support streaming where we don't have the whole buffer.
If generic lsb first support for SPI is too high a bar (which it may be),
I will move the bit reversing code into the write function.
> Thanks for submitting, Joshua. Will be looking at this over the
> next several days.
> Alan
Thanks for the quick response!
I'll be looking forward to your review,

Joshua Clayton