[PATCH v9 1/1] PRUSS UIO driver support
Thomas Gleixner
tglx at linutronix.de
Tue Mar 8 05:34:59 EST 2011
On Fri, 4 Mar 2011, TK, Pratheesh Gangadhar wrote:
> Hi,
> > -----Original Message-----
> > From: Arnd Bergmann [mailto:arnd at arndb.de]
> > Sent: Thursday, March 03, 2011 11:46 PM
> > On Thursday 03 March 2011 19:07:57 Pratheesh Gangadhar wrote:
> > > +struct uio_pruss_dev {
> > > + struct uio_info *info;
> > > + struct clk *pruss_clk;
> > > + dma_addr_t sram_paddr;
> > > + dma_addr_t ddr_paddr;
> > > + void __iomem *prussio_vaddr;
> > > + void *sram_vaddr;
> > > + void *ddr_vaddr;
> > > + unsigned int hostirq_start;
> > > + unsigned int pintc_base;
> > > +};
> > > +
> > > +struct pruss_priv {
> > > + struct uio_pruss_dev *pupdev;
> > > +};
> >
> > I cannot see the point of struct pruss_priv, I think it would be better to
> > just merge the two data structures into one. Everything else looks
> > good to me now.
>
> pruss_priv is needed to get access to uio_pruss_dev from uio_info *info in
> UIO interrupt handler (pruss_handler) and shall be per interrupt entry.
>
> +static irqreturn_t pruss_handler(int irq, struct uio_info *info) {
> + struct pruss_priv *priv = info->priv;
> + struct uio_pruss_dev *gdev = priv->pupdev;
>
> Note that info is a pointer to array supporting 8 interrupts. This allows to
> redirect to driver structure via info->priv quickly.
struct uio_pruss_dev *dev = container_of(info, struct uio_pruss_dev, info);
Perhaps ?
Thanks,
tglx
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