On Feb 7, 2007, at 11:52 PM, Li Yang-r58472 wrote:
-----Original Message-----
From: Timur Tabi [mailto:[EMAIL PROTECTED]
Sent: Thursday, February 08, 2007 1:03 AM
To: Kumar Gala
Cc: Li Yang-r58472; netdev@vger.kernel.org; [EMAIL PROTECTED]
Subject: Re: [PATCH 1/4] ucc_geth: Change private
immrbar_virt_to_phys
to generic
iopa
Kumar Gala wrote:
If its been mapped with ioremap() you know the physical address
already
so why do you need iopa().
That's what the original function immrbar_virt_to_phys() does. We're
trying to
get rid of it, because we thought is redundant with iopa().
static inline unsigned long immrbar_virt_to_phys(volatile void *
address)
{
if ( ((u32)address >= (u32)qe_immr) &&
((u32)address < ((u32)qe_immr + QE_IMMAP_SIZE))
)
return (unsigned long)(address - (u32)qe_immr +
(u32)get_qe_base());
return (unsigned long)virt_to_phys(address);
}
get_qe_base() does a search of the OF tree the first time it's
called.
Here's the code that calls immrbar_virt_to_phys():
out_be32(&ugeth->p_send_q_mem_reg->sqqd[i].bd_ring_base,
(u32) immrbar_virt_to_phys(ugeth->
p_tx_bd_ring[i]));
Would it be better to replace this code with something like this:
out_be32(&ugeth->p_send_q_mem_reg->sqqd[i].bd_ring_base,
get_qe_base() + ((void *) ugeth->p_tx_bd_ring[i] - (void *)
qe_immr));
No, we don't know if the BD ring is in MURAM or main memory as it is
configurable. iopa() is best choice to handle both case, IMHO.
Does MURAM behave differently than normal memory?
- k
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