* Tomi Valkeinen <[email protected]> [121008 05:31]:
> This patch converts vrfb library into a platform device, in an effort to
> remove omap dependencies.
>
> The platform device is registered in arch/arm/plat-omap/fb.c and
> assigned resources depending on whether running on omap2 or omap3.
>
> The vrfb driver will parse those resources and use them to access vrfb
> configuration registers and the vrfb virtual rotation areas.
>
> Signed-off-by: Tomi Valkeinen <[email protected]>
> Cc: Tony Lindgren <[email protected]>
> ---
> arch/arm/plat-omap/fb.c | 53 +++++++++++++++++++
> drivers/video/omap2/vrfb.c | 124
> +++++++++++++++++++++++++++++++++++++-------
> 2 files changed, 157 insertions(+), 20 deletions(-)
>
> diff --git a/arch/arm/plat-omap/fb.c b/arch/arm/plat-omap/fb.c
> index dd6f92c..d231912 100644
> --- a/arch/arm/plat-omap/fb.c
> +++ b/arch/arm/plat-omap/fb.c
> @@ -35,6 +35,59 @@
>
> #include <plat/board.h>
>
> +#if defined(CONFIG_OMAP2_VRFB)
> +static const struct resource omap2_vrfb_resources[] = {
> + DEFINE_RES_MEM(0x68008000u, 0x40),
> + DEFINE_RES_MEM(0x70000000u, 0x4000000),
> + DEFINE_RES_MEM(0x74000000u, 0x4000000),
> + DEFINE_RES_MEM(0x78000000u, 0x4000000),
> + DEFINE_RES_MEM(0x7c000000u, 0x4000000),
> +};
> +
> +static const struct resource omap3_vrfb_resources[] = {
> + DEFINE_RES_MEM(0x6C000180u, 0xc0),
> + DEFINE_RES_MEM(0x70000000u, 0x4000000),
> + DEFINE_RES_MEM(0x74000000u, 0x4000000),
> + DEFINE_RES_MEM(0x78000000u, 0x4000000),
> + DEFINE_RES_MEM(0x7c000000u, 0x4000000),
> + DEFINE_RES_MEM(0xe0000000u, 0x4000000),
> + DEFINE_RES_MEM(0xe4000000u, 0x4000000),
> + DEFINE_RES_MEM(0xe8000000u, 0x4000000),
> + DEFINE_RES_MEM(0xec000000u, 0x4000000),
> + DEFINE_RES_MEM(0xf0000000u, 0x4000000),
> + DEFINE_RES_MEM(0xf4000000u, 0x4000000),
> + DEFINE_RES_MEM(0xf8000000u, 0x4000000),
> + DEFINE_RES_MEM(0xfc000000u, 0x4000000),
> +};
Maybe add comments describing what these register are in case
we have a framework handling them at some point later on?
> --- a/drivers/video/omap2/vrfb.c
> +++ b/drivers/video/omap2/vrfb.c
> +#define SMS_ROT_CONTROL(context) (0x0 + 0x10 * context)
> +#define SMS_ROT_SIZE(context) (0x4 + 0x10 * context)
> +#define SMS_ROT_PHYSICAL_BA(context) (0x8 + 0x10 * context)
> +#define SMS_ROT_VIRT_BASE(rot) (0x1000000 * (rot))
Can you please also remove the old SMS defines and functions
so other code won't start tinkering with them?
> +static int __init vrfb_probe(struct platform_device *pdev)
> +{
> + struct resource *mem;
> + int i;
> +
> + /* first resource is the register res, the rest are vrfb contexts */
> +
> + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!mem) {
> + dev_err(&pdev->dev, "can't get vrfb base address\n");
> + return -EINVAL;
> + }
Now that we assume vrfb is the only user of this, so you must do
request_mem_region here as that's the only protection we have.
If that fails here, then we know something is wrong.
> + vrfb_base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
> + if (!vrfb_base) {
> + dev_err(&pdev->dev, "can't ioremap vrfb memory\n");
> + return -ENOMEM;
> + }
> +
> + num_ctxs = pdev->num_resources - 1;
> +
> + ctxs = devm_kzalloc(&pdev->dev,
> + sizeof(struct vrfb_ctx) * num_ctxs,
> + GFP_KERNEL);
> +
> + if (!ctxs)
> + return -ENOMEM;
> +
> + for (i = 0; i < num_ctxs; ++i) {
> + mem = platform_get_resource(pdev, IORESOURCE_MEM, 1 + i);
> + if (!mem) {
> + dev_err(&pdev->dev, "can't get vrfb ctx %d address\n",
> + i);
> + return -EINVAL;
> + }
> +
> + ctxs[i].base = mem->start;
> + }
And request_mem_region must also be done for these registers to make
sure no other code is using them. Again, if it fails, something is
wrong.
Regards,
Tony
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