linux-kernel - Re: [PATCH v2 74/71] ncr5380: Enable PDMA for NCR53C400A

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Date:	Tue, 8 Dec 2015 13:05:11 +1100 (AEDT)
From:	Finn Thain <fthain@...egraphics.com.au>
To:	Ondrej Zary <linux@...nbow-software.org>
cc:	Michael Schmitz <schmitzmic@...il.com>, linux-m68k@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 74/71] ncr5380: Enable PDMA for NCR53C400A


On Sun, 6 Dec 2015, Ondrej Zary wrote:

> Add I/O register mapping for NCR53C400A and enable PDMA mode to
> improve performance and fix non-working IRQ.
> 
> Tested with HP C2502 (and user-space enabler).
> 
> Signed-off-by: Ondrej Zary <linux@...nbow-software.org>
> ---
>  drivers/scsi/g_NCR5380.c |   14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c
> index 86740fd..099fdac 100644
> --- a/drivers/scsi/g_NCR5380.c
> +++ b/drivers/scsi/g_NCR5380.c
> @@ -324,7 +324,7 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
>  #endif
>  			break;
>  		case BOARD_NCR53C400A:
> -			flags = FLAG_NO_PSEUDO_DMA;
> +			flags = FLAG_NO_DMA_FIXUP;
>  			ports = ncr_53c400a_ports;
>  			break;
>  		case BOARD_DTC3181E:
> @@ -406,11 +406,18 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
>  		 * On NCR53C400 boards, NCR5380 registers are mapped 8 past
>  		 * the base address.
>  		 */
> -		if (overrides[current_override].board == BOARD_NCR53C400) {
> +		switch (overrides[current_override].board) {
> +		case BOARD_NCR53C400:
>  			instance->io_port += 8;
>  			hostdata->c400_ctl_status = 0;
>  			hostdata->c400_blk_cnt = 1;
>  			hostdata->c400_host_buf = 4;
> +			break;
> +		case BOARD_NCR53C400A:
> +			hostdata->c400_ctl_status = 9;
> +			hostdata->c400_blk_cnt = 10;
> +			hostdata->c400_host_buf = 8;
> +			break;
>  		}
>  #else
>  		instance->base = overrides[current_override].NCR5380_map_name;


For SCSI_G_NCR5380_MEM and BOARD_NCR53C400A (or BOARD_DTC3181E), you have 
not assigned c400_ctl_status, c400_blk_cnt and c400_host_buf. Perhaps we 
should throw an error, something like this?

 		hostdata->iomem = iomem;
-		if (overrides[current_override].board == BOARD_NCR53C400) {
+		switch (overrides[current_override].board) {
+		case BOARD_NCR53C400:
 			hostdata->c400_ctl_status = 0x100;
 			hostdata->c400_blk_cnt = 0x101;
 			hostdata->c400_host_buf = 0x104;
+			break;
+		case BOARD_NCR53C400A:
+			pr_err(DRV_MODULE_NAME ": unknown register offsets\n");
+			goto out_unregister;
 		}
 #endif
 
-- 

> @@ -425,7 +432,8 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
>  		if (NCR5380_init(instance, flags))
>  			goto out_unregister;
>  
> -		if (overrides[current_override].board == BOARD_NCR53C400)
> +		if (overrides[current_override].board == BOARD_NCR53C400 ||
> +		    overrides[current_override].board == BOARD_NCR53C400A)
>  			NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
>  
>  		NCR5380_maybe_reset_bus(instance);
> 
--
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