Nabil Rahiman wrote:
> Hi,
>
> I am trying to port the lnux device driver into Solaris platform.
Just a heads up. Unless you wrote the original Linux driver, or have
explicit permission from the author to perform such a port, generally
you cannot do this. At least one prominent author of Linux device
drivers (Donald Becker) has been very vocal about his willingness to
bring lawsuits against anyone who tries to port (or otherwise create
derivative works) his code to any operating system which is not GPLv2.
At the moment, I believe Linux is the only major OS that carries a GPLv2.
What can work, is to use the Linux code to understand how the device
works, and then write a fresh driver based on your understanding of the
device. This is hard to do safely -- if you are going to do that, I
recommend writing a chip specification from the Linux code (assuming you
can't find one), or writing, in plain language, chip behaviors. Then
use *that* to help you write your driver.
In general, if a driver in NetBSD/FreeBSD/OpenBSD exists, they are much
safer to use. (Plus, to be quite honest, I have found that the code
written by BSD developers tends to be a little higher quality -- easier
to understand and maintain, and you'll also find that the BSD style
guidelines are almost bang-on identical to Solaris' cstyle rules.)
-- Garrett
>
> In Solaris for allocatting dma resource, we have to set the
> following set of dma attributes.
>
> typedef struct ddi_dma_attr {
>
> uint_t dma_attr_version; /* version number */
> uint64_t dma_attr_addr_lo; /* low DMA address range */
> uint64_t dma_attr_addr_hi; /* high DMA address range */
>
> uint64_t dma_attr_count_max; /* DMA counter register */
> uint64_t dma_attr_align; /* DMA address alignment */
> uint_t dma_attr_burstsizes; /* DMA burstsizes */
>
> uint32_t dma_attr_minxfer; /* min effective DMA size */
> uint64_t dma_attr_maxxfer; /* max DMA xfer size */
> uint64_t dma_attr_seg; /* segment boundary */
>
> int dma_attr_sgllen; /* s/g length */
> uint32_t dma_attr_granular; /* granularity of device */
> uint_t dma_attr_flags; /* Bus specific DMA flags */
>
> } ddi_dma_attr_t;
>
> And most of these attribute values are specific to the device.
>
> But I couldn't find out the corresponding structure/functionality in
> Linux.
>
> Please guide me.
>
>
> Regards,
> Nabil
> ------------------------------------------------------------------------
>
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>
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