netdev - Re: [PATCH 1/5] temac: Add Virtex4 address mappings

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Date:	Mon, 22 Feb 2010 15:10:39 -0700
From:	Grant Likely <grant.likely@...retlab.ca>
To:	gfilip@...ethz.ch
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH 1/5] temac: Add Virtex4 address mappings

On Mon, Feb 22, 2010 at 12:06 PM,  <gfilip@...ethz.ch> wrote:
> This patch belongs to a set of patches which extends the temac driver to support Virtex4-FX. It was successfully tested on the ML403 evaluation board.
>
> Signed-off-by: Filip Gospodinov <gfilip@...ethz.ch>
> ---
>  drivers/net/ll_temac.h |   46 ++++++++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 46 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/net/ll_temac.h b/drivers/net/ll_temac.h
> index 1af66a1..95dd650 100644
> --- a/drivers/net/ll_temac.h
> +++ b/drivers/net/ll_temac.h
> @@ -56,7 +56,52 @@ This option defaults to enabled (set) */
>         XTE_OPTION_RXEN)
>
>  /* XPS_LL_TEMAC SDMA registers definition */
> +#ifdef CONFIG_XILINX_VIRTEX_4_FX
> +#define TX_NXTDESC_PTR      0x00            /* r */
> +#define TX_CURBUF_ADDR      0x04            /* r */
> +#define TX_CURBUF_LENGTH    0x08            /* r */
> +#define TX_CURDESC_PTR      0x0C            /* rw */
> +#define TX_TAILDESC_PTR     0x10            /* rw */
> +#define TX_CHNL_CTRL        0x14            /* rw */
> +#define CHNL_CTRL_IRQ_IOE       (1 << 9)
> +#define CHNL_CTRL_IRQ_EN        (1 << 7)
> +#define CHNL_CTRL_IRQ_ERR_EN    (1 << 2)
> +#define CHNL_CTRL_IRQ_DLY_EN    (1 << 1)
> +#define CHNL_CTRL_IRQ_COAL_EN   (1 << 0)
> +#define TX_IRQ_REG          0x18            /* rw */
> +#define TX_CHNL_STS         0x1C            /* r */
> +#define RX_NXTDESC_PTR      0x20            /* r */
> +#define RX_CURBUF_ADDR      0x24            /* r */
> +#define RX_CURBUF_LENGTH    0x28            /* r */
> +#define RX_CURDESC_PTR      0x2C            /* rw */
> +#define RX_TAILDESC_PTR     0x30            /* rw */
> +#define RX_CHNL_CTRL        0x34            /* rw */
> +#define RX_IRQ_REG          0x38           /* rw */
> +#define IRQ_COAL        (1 << 0)
> +#define IRQ_DLY         (1 << 1)
> +#define IRQ_ERR         (1 << 2)
> +#define IRQ_DMAERR      (1 << 7)            /* this is not documented ??? */
> +#define RX_CHNL_STS         0x3C        /* r */
> +#define CHNL_STS_ENGBUSY    (1 << 1)
> +#define CHNL_STS_EOP        (1 << 2)
> +#define CHNL_STS_SOP        (1 << 3)
> +#define CHNL_STS_CMPLT      (1 << 4)
> +#define CHNL_STS_SOE        (1 << 5)
> +#define CHNL_STS_IOE        (1 << 6)
> +#define CHNL_STS_ERR        (1 << 7)
> +
> +#define CHNL_STS_BSYWR      (1 << 16)
> +#define CHNL_STS_CURPERR    (1 << 17)
> +#define CHNL_STS_NXTPERR    (1 << 18)
> +#define CHNL_STS_ADDRERR    (1 << 19)
> +#define CHNL_STS_CMPERR     (1 << 20)
> +#define CHNL_STS_TAILERR    (1 << 21)
> +
> +#define DMA_CONTROL_REG             0x40            /* rw */
> +#define DMA_CONTROL_RST                 (1 << 0)
> +#define DMA_TAIL_ENABLE                 (1 << 2)
>

Oh, ugly.  The register definitions are identical for virtex4 mmio
access and virtex5 DCR access.  The only difference is the multiplier
(DCRs increase by 1, mmio increments by 4) to the register.  Rather
than defining a whole new register block, just multiply the offset by
4 when doing an MMIO access.

g.
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