linux-kernel - [PATCH] Patch Dreamcast AICA driver to handle Maple bus support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 9 Sep 2007 21:22:17 +0100
From:	"Adrian McMenamin" <adrianmcmenamin@...il.com>
To:	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	linuxsh-dev@...ts.sourceforge.net
Cc:	"Paul Mundt" <lethal@...ux-sh.org>
Subject: [PATCH] Patch Dreamcast AICA driver to handle Maple bus support

This patches the AICA sound driver for the Dreamcast to handle the
well known flakiness of the Dreamcast's G2 bus.

This is dependent on getting Maple bus support (see
http://lkml.org/lkml/2007/9/9/70) into the kernel.

Signed-off by: Adrian McMenamin <adrian@...en.demon.co.uk>

diff --git a/sound/sh/aica.c b/sound/sh/aica.c
index 7397865..a42c58f 100644
--- a/sound/sh/aica.c
+++ b/sound/sh/aica.c
@@ -35,6 +35,7 @@
 #include <linux/timer.h>
 #include <linux/delay.h>
 #include <linux/workqueue.h>
+#include <linux/maple.h>
 #include <sound/driver.h>
 #include <sound/core.h>
 #include <sound/control.h>
@@ -43,7 +44,7 @@
 #include <sound/info.h>
 #include <asm/io.h>
 #include <asm/dma.h>
-#include <asm/dreamcast/sysasic.h>
+#include <asm/mach/sysasic.h>
 #include "aica.h"

 MODULE_AUTHOR("Adrian McMenamin <adrian@...en.demon.co.uk>");
@@ -218,6 +219,12 @@ static int aica_dma_transfer(int channels, int buffer_size,
 	period_offset = dreamcastcard->clicks;
 	period_offset %= (AICA_PERIOD_NUMBER / channels);
 	runtime = substream->runtime;
+	/* If maple dma is running, wait for it to finish */
+	do{ cpu_relax();}
+	while (!maple_dma_done());
+	/* Turn off the maple dma now */
+	ctrl_outl(0, MAPLE_ENABLE);
+	local_irq_disable();	
 	for (q = 0; q < channels; q++) {
 		err = dma_xfer(AICA_DMA_CHANNEL,
 			       (unsigned long) (runtime->dma_area +
@@ -232,6 +239,9 @@ static int aica_dma_transfer(int channels, int buffer_size,
 			break;
 		dma_wait_for_completion(AICA_DMA_CHANNEL);
 	}
+	/* restore maple dma */
+	local_irq_enable();
+	maplebus_init_hardware();
 	return err;
 }
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/