[Skiboot] [PATCH 1/9] npu2: Add a function to detect POWER9 DD1

[Alistair Popple]

On Fri, 14 Jul 2017 10:39:20 AM Reza Arbab wrote:
> Provide a convenience we'll use quite a bit to preserve backwards
> compatibility with DD1.
> 
> Cc: Alistair Popple <alistair at popple.id.au>
> Signed-off-by: Reza Arbab <arbab at linux.vnet.ibm.com>
> ---
>  hw/npu2.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/hw/npu2.c b/hw/npu2.c
> index 83451c3..a986652 100644
> --- a/hw/npu2.c
> +++ b/hw/npu2.c
> @@ -58,6 +58,16 @@
>  
>  #define VENDOR_CAP_PCI_DEV_OFFSET 0x0d
>  
> +static bool is_p9dd1(void)

We could get the proc_chip from struct npu2 rather than just assuming all chips
are the same, but that seems overly complicated as I doubt we will ever support
multiple DD levels in a single system.

Acked-by: Alistair Popple <alistair at popple.id.au>

> +{
> +	struct proc_chip *chip = next_chip(NULL);
> +
> +	return chip &&
> +	       (chip->type == PROC_CHIP_P9_NIMBUS ||
> +		chip->type == PROC_CHIP_P9_CUMULUS) &&
> +	       (chip->ec_level & 0xf0) == 0x10;
> +}
> +
>  /*
>   * We use the indirect method because it uses the same addresses as
>   * the MMIO offsets (NPU RING)
>