[PATCH v5 1/7] riscv: Add DMA 64-bit address support

[Padmarao Begari]

Hi Bin,

On Thu, Dec 10, 2020 at 4:11 PM Bin Meng <bmeng.cn at gmail.com> wrote:

> Hi Padmarao,
>
> On Thu, Dec 3, 2020 at 4:43 AM Padmarao Begari
> <padmarao.begari at microchip.com> wrote:
> >
> > dma_addr_t holds any valid DMA address. If the DMA API only uses
> 32/64-bit
> > addresses, dma_addr_t need only be 32/64 bits wide.
> >
> > Signed-off-by: Padmarao Begari <padmarao.begari at microchip.com>
> > Reviewed-by: Anup Patel <anup.patel at wdc.com>
> > ---
> >  arch/riscv/Kconfig             | 4 ++++
> >  arch/riscv/include/asm/types.h | 4 ++++
> >  2 files changed, 8 insertions(+)
> >
> > diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> > index 30b05408b1..55eaee2da6 100644
> > --- a/arch/riscv/Kconfig
> > +++ b/arch/riscv/Kconfig
> > @@ -152,6 +152,10 @@ config 32BIT
> >  config 64BIT
> >         bool
> >
> > +config DMA_ADDR_T_64BIT
> > +       bool
> > +       default y if 64BIT
> > +
> >  config SIFIVE_CLINT
> >         bool
> >         depends on RISCV_MMODE || SPL_RISCV_MMODE
> > diff --git a/arch/riscv/include/asm/types.h
> b/arch/riscv/include/asm/types.h
> > index 403cf9a48f..b800b2d221 100644
> > --- a/arch/riscv/include/asm/types.h
> > +++ b/arch/riscv/include/asm/types.h
> > @@ -29,7 +29,11 @@ typedef unsigned short umode_t;
> >
> >  #include <stddef.h>
> >
> > +#ifdef CONFIG_DMA_ADDR_T_64BIT
> > +typedef u64 dma_addr_t;
> > +#else
> >  typedef u32 dma_addr_t;
> > +#endif
>
> Why is this patch needed for U-Boot?
>
>
Initially this patch was created for the MACB driver dependency and now the
MACB driver is not dependent on CONFIG_DMA_ADDR_T_64BIT.
But We created this patch the same as the ARM 64-bit kconfig and the
'CONFIG_DMA_ADDR_T_64BIT' is used when the MMC driver is configured with
DMA.

Regards
Padmarao


> Regards,
> Bin
>