linux-kernel - Re: [PATCH again] [libata] libata driver for bf548 on chip ATAPI controller.

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Message-ID: <4e5ebad50708150155s5cd75a5bt813742b5a02d56d@mail.gmail.com>
Date:	Wed, 15 Aug 2007 16:55:48 +0800
From:	"Sonic Zhang" <sonic.adi@...il.com>
To:	"Alan Cox" <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH again] [libata] libata driver for bf548 on chip ATAPI controller.

On 8/14/07, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> > +/**
> > + * Register transfer timing table
> > + */
>
> Libata has a complete set of transfer mode tables and timing functions -
> any reason for not using them ?
>

After a bit investigation, I find the timing paramters difined in
struct ata_timing are different from that in hardware manual of BF548.

struct ata_timing {
        unsigned short mode;            /* ATA mode */
        unsigned short setup;           /* t1 */
        unsigned short act8b;           /* t2 for 8-bit I/O */
        unsigned short rec8b;           /* t2i for 8-bit I/O */
        unsigned short cyc8b;           /* t0 for 8-bit I/O */
        unsigned short active;          /* t2 or tD */
        unsigned short recover;         /* t2i or tK */
        unsigned short cycle;           /* t0 */
        unsigned short udma;            /* t2CYCTYP/2 */
};

BF548 PIO timing registers:
        u8 teoc_reg;
        u8 t2_reg;

        u4 t4_reg;
        u8 t2_pio;
        u4 t1_reg;

        u8 teoc_pio;

BF548 UDMA timing registers:
        u8 tenv;
        u8 tack;

        u8 tcyc_tdvs;
        u8 tdvs;

        u8 tmli;
        u8 tss;

        u8 trp;
        u8 tzah;

I can't find a simple way to configure bf548 registers with the ata_timing data.
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