Hi Prabu,
On Tue, August 20, 2013, Arnd Bergmann wrote:
> On Monday 19 August 2013, Prabu Thangamuthu wrote:
> >
> > +#ifdef CONFIG_MMC_DW_IDMAC_64BIT_ADDRESS
> > + u32 des1; /* Reserved */
> > +
> > + u32 des2; /* Buffer sizes */
> > +#define IDMAC_SET_BUFFER1_SIZE(d, s) \
> > + ((d)->des2 = ((d)->des2 & 0x03ffe000) | ((s) & 0x1fff))
> > +
> > + u32 des3; /* Reserved */
> > +
> > + u32 des4; /* Lower 32-bits of Buffer Address Pointer 1*/
> > + u32 des5; /* Upper 32-bits of Buffer Address Pointer 1*/
> > + u32 des6; /* Lower 32-bits of Next Descriptor Address */
> > + u32 des7; /* Upper 32-bits of Next Descriptor Address */
> > +#else
> > u32 des1; /* Buffer sizes */
> > #define IDMAC_SET_BUFFER1_SIZE(d, s) \
> > ((d)->des1 = ((d)->des1 & 0x03ffe000) | ((s) & 0x1fff))
> > @@ -73,6 +86,7 @@ struct idmac_desc {
> > u32 des2; /* buffer 1 physical address */
> >
> > u32 des3; /* buffer 2 physical address */
> > +#endif /* CONFIG_MMC_DW_IDMAC_64BIT_ADDRESS */
>
> This is not a good idea: It means you cannot build the driver to support
> both 32 and 64 bit at run-time. You have to remove all the #ifdef here
> and replace it with runtime checks. You also need to update the binding
> document to provide a way to detect which one is present in a given
> system.
>
I guess HCON register can be used to identify 32 or 64 bit, right?
You already used it.
addr_config = (mci_readl(host, HCON) >> 27) & 0x01;
Then, CONFIG_MMC_DW_IDMAC_64BIT_ADDRESS could be removed.
Thanks,
Seungwon Jeon
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