Re: [PATCH] PC-9800 subarch. support for 2.5.64-ac3 (16/20) SCSI

From: Geert Uytterhoeven (geert@linux-m68k.org)
Date: Wed Mar 12 2003 - 06:49:14 EST

On Sun, 9 Mar 2003, Osamu Tomita wrote:
> This is the patch to support NEC PC-9800 subarchitecture
> against 2.5.64-ac3. (16/20)
>
> SCSI host adapter support.
> - BIOS parameter change for PC98.
> - Add pc980155 driver for old PC98.
> - wd33c93.h register address size to int, because PC-9801-55 mapped 0xcc0.
>
> Regards,
> Osamu Tomita
>
> diff -Nru linux/drivers/scsi/wd33c93.h linux98/drivers/scsi/wd33c93.h
> --- linux/drivers/scsi/wd33c93.h 2002-10-12 13:21:35.000000000 +0900
> +++ linux98/drivers/scsi/wd33c93.h 2002-10-12 14:18:53.000000000 +0900
> @@ -186,8 +186,13 @@
>
> /* This is what the 3393 chip looks like to us */
> typedef struct {
> +#if defined(CONFIG_SCSI_PC980155) || defined(CONFIG_SCSI_PC980155_MODULE)
> + volatile unsigned int *SASR;
> + volatile unsigned int *SCMD;

Since you want to do ordinary ISA/PCI I/O on SASR and SCMD, I think you want to
get rid of the pointers and put the plain I/O port numbers there:

    unsigned long SASR;
    unsigned long SCMD;

> +#else
> volatile unsigned char *SASR;
> volatile unsigned char *SCMD;
> +#endif

M68k and MIPS use pointers because they do MMIO.

Then the following can go away:

> +static unsigned int SASR;
> +static unsigned int SCMD;
> +static wd33c93_regs regs = {&SASR, &SCMD};

And you store the I/O ports here:

    static wd33c93_regs regs;

> + for (i = 0; i < nr_base_ios; i++) {
> + base_io = base_ios[i];
> + SASR = REG_ADDRST;
> + SCMD = REG_CONTRL;

      regs.SASR = REG_ADDRST;
      regs.SCMD = REG_CONTRL;

> +static int pc980155_abort(Scsi_Cmnd *cmd)
> +{
> + if (wd33c93_abort(cmd) == SCSI_ABORT_SUCCESS)
> + return SUCCESS;
> +
> + return FAILED;
> +}

The abort handler is generic. Hence it can be moved to wd33c93.c, so the other
wd33c93 drivers (my main interest :-) can use it.

> +static int pc980155_bus_reset(Scsi_Cmnd *cmd)
> +{
> + struct WD33C93_hostdata *hostdata
> + = (struct WD33C93_hostdata *)cmd->device->host->hostdata;
> +
> + pc980155_int_disable(hostdata->regs);
> + pc980155_assert_bus_reset(hostdata->regs);
> + udelay(50);
> + pc980155_negate_bus_reset(hostdata->regs);
> + (void) inb(*hostdata->regs.SASR);
> + (void) read_pc980155(hostdata->regs, WD_SCSI_STATUS);
> + pc980155_int_enable(hostdata->regs);
> + wd33c93_reset(cmd, 0);
> + return SUCCESS;
> +}

Is there a generic (wd33c93) way to do this?

> +static int pc980155_host_reset(Scsi_Cmnd *cmd)
> +{
> + wd33c93_reset(cmd, 0);
> + return SUCCESS;
> +}

The host reset handler is generic, too.

Gr{oetje,eeting}s,

                                                Geert 

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds

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