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Re: IDE DMA mode in Big endian for mips

To: hli@quicklogic.com
Subject: Re: IDE DMA mode in Big endian for mips
From: Atsushi Nemoto <nemoto@toshiba-tops.co.jp>
Date: Wed, 17 Oct 2001 11:38:42 +0900 (JST)
Cc: linux-mips@oss.sgi.com
In-reply-to: <APEOLACBIPNAFKJDDFIIEECJCBAA.hli@quicklogic.com>
Organization: TOSHIBA Personal Computer System Corporation
References: <20011012225433.A10523@lucon.org> <APEOLACBIPNAFKJDDFIIEECJCBAA.hli@quicklogic.com>
Sender: owner-linux-mips@oss.sgi.com
>>>>> On Tue, 16 Oct 2001 10:28:56 -0400, "Hanks Li" <hli@quicklogic.com> said:
hli> We are working on the IDE/ATAPI for mips. When I changed to Big
hli> endian mode, the following information appared, and the program
hli> hang.

When I tried PCI-IDE in BigEndian (with 2.4.6 kernel), this patch
solved my problem.

--- linux/drivers/ide/ide-dma.c:1.1.1.1 Fri Jul  6 11:24:54 2001
+++ linux/drivers/ide/ide-dma.c Fri Aug 17 20:17:30 2001
@@ -492,7 +492,11 @@
                        SELECT_READ_WRITE(hwif,drive,func);
                        if (!(count = ide_build_dmatable(drive, func)))
                                return 1;       /* try PIO instead of DMA */
+#if defined(__mips__) && defined(__BIG_ENDIAN) /* XXX mips only? */
+                       outl(cpu_to_le32(hwif->dmatable_dma), dma_base + 4); /* 
PRD table */
+#else
                        outl(hwif->dmatable_dma, dma_base + 4); /* PRD table */
+#endif
                        outb(reading, dma_base);                        /* 
specify r/w */
                        outb(inb(dma_base+2)|6, dma_base+2);            /* 
clear INTR & ERROR flags */
                        drive->waiting_for_dma = 1;
---
Atsushi Nemoto

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