Hi Kieran,
On Fri, Aug 16, 2019 at 09:07:14AM +0100, Kieran Bingham wrote:
> On 14/08/2019 15:54, Laurent Pinchart wrote:
> > This helps identifying the IP core version, for debugging purpose only
> > for now.
> >
> > Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
> > ---
> > Changes since v1:
> >
> > - Use devm_platform_ioremap_resource()
> > ---
> > drivers/media/platform/rcar-fcp.c | 41 +++++++++++++++++++++++++++++++
> > 1 file changed, 41 insertions(+)
> >
> > diff --git a/drivers/media/platform/rcar-fcp.c b/drivers/media/platform/rcar-fcp.c
> > index 43c78620c9d8..6e0c0e7c0f8c 100644
> > --- a/drivers/media/platform/rcar-fcp.c
> > +++ b/drivers/media/platform/rcar-fcp.c
> > @@ -8,6 +8,7 @@
> > */
> >
> > #include <linux/device.h>
> > +#include <linux/io.h>
> > #include <linux/list.h>
> > #include <linux/module.h>
> > #include <linux/mod_devicetable.h>
> > @@ -21,11 +22,38 @@
> > struct rcar_fcp_device {
> > struct list_head list;
> > struct device *dev;
> > + void __iomem *iomem;
> > };
> >
> > static LIST_HEAD(fcp_devices);
> > static DEFINE_MUTEX(fcp_lock);
> >
> > +#define FCP_VCR 0x0000
> > +#define FCP_VCR_CATEGORY_MASK (0xff << 8)
> > +#define FCP_VCR_CATEGORY_SHIFT 8
> > +#define FCP_VCR_REVISION_MASK (0xff << 0)
> > +#define FCP_VCR_REVISION_SHIFT 0
> > +
> > +#define FCP_CFG0 0x0004
> > +#define FCP_RST 0x0010
> > +#define FCP_STA 0x0018
> > +#define FCP_TL_CTRL 0x0070
> > +#define FCP_PICINFO1 0x00c4
> > +#define FCP_BA_ANC_Y0 0x0100
> > +#define FCP_BA_ANC_Y1 0x0104
> > +#define FCP_BA_ANC_Y2 0x0108
> > +#define FCP_BA_ANC_C 0x010c
> > +#define FCP_BA_REF_Y0 0x0110
> > +#define FCP_BA_REF_Y1 0x0114
> > +#define FCP_BA_REF_Y2 0x0118
> > +#define FCP_BA_REF_C 0x011c
>
> Do we need to pull in all these extra register definitions just to read
> the version?
>
> They don't hurt if they're for something else later...
At least FCP_CFG0 will be used for FCNL. Some of the other registers
could be left out, but I don't think they really hurt either, they don't
take any space in the compiled object.
> Otherwise,
>
> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
>
> > +
> > +
> > +static inline u32 rcar_fcp_read(struct rcar_fcp_device *fcp, u32 reg)
> > +{
> > + return ioread32(fcp->iomem + reg);
> > +}
> > +
> > /* -----------------------------------------------------------------------------
> > * Public API
> > */
> > @@ -129,6 +157,7 @@ EXPORT_SYMBOL_GPL(rcar_fcp_disable);
> > static int rcar_fcp_probe(struct platform_device *pdev)
> > {
> > struct rcar_fcp_device *fcp;
> > + u32 version;
> >
> > fcp = devm_kzalloc(&pdev->dev, sizeof(*fcp), GFP_KERNEL);
> > if (fcp == NULL)
> > @@ -138,6 +167,18 @@ static int rcar_fcp_probe(struct platform_device *pdev)
> >
> > pm_runtime_enable(&pdev->dev);
> >
> > + fcp->iomem = devm_platform_ioremap_resource(pdev, 0);
> > + if (IS_ERR(fcp->iomem))
> > + return PTR_ERR(fcp->iomem);
> > +
> > + pm_runtime_get_sync(&pdev->dev);
> > + version = rcar_fcp_read(fcp, FCP_VCR);
> > + pm_runtime_put(&pdev->dev);
> > +
> > + dev_dbg(&pdev->dev, "FCP category %u revision %u\n",
> > + (version & FCP_VCR_CATEGORY_MASK) >> FCP_VCR_CATEGORY_SHIFT,
> > + (version & FCP_VCR_REVISION_MASK) >> FCP_VCR_REVISION_SHIFT);
> > +
> > mutex_lock(&fcp_lock);
> > list_add_tail(&fcp->list, &fcp_devices);
> > mutex_unlock(&fcp_lock);
--
Regards,
Laurent Pinchart
