linux-kernel - [168/205] libertas/sdio: 8686: set ECSI bit for 1-bit transfers

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Message-Id: <20100730175149.193511268@clark.site>
Date:	Fri, 30 Jul 2010 10:53:05 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Daniel Mack <daniel@...aq.de>,
	Alagu Sankar <alagusankar@...wise.com>,
	Volker Ernst <volker.ernst@...r.com>,
	Dan Williams <dcbw@...hat.com>,
	"John W. Linville" <linville@...driver.com>,
	Holger Schurig <hs4233@...l.mn-solutions.de>,
	Bing Zhao <bzhao@...vell.com>,
	libertas-dev@...ts.infradead.org, linux-wireless@...r.kernel.org,
	linux-mmc@...r.kernel.org
Subject: [168/205] libertas/sdio: 8686: set ECSI bit for 1-bit transfers

2.6.34-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Daniel Mack <daniel@...aq.de>

commit 8a64c0f6b7ec7f758c4ef445e49f479e27fa2236 upstream.

When operating in 1-bit mode, SDAT1 is used as dedicated interrupt line.
However, the 8686 will only drive this line when the ECSI bit is set in
the CCCR_IF register.

Thanks to Alagu Sankar for pointing me in the right direction.

Signed-off-by: Daniel Mack <daniel@...aq.de>
Cc: Alagu Sankar <alagusankar@...wise.com>
Cc: Volker Ernst <volker.ernst@...r.com>
Cc: Dan Williams <dcbw@...hat.com>
Cc: John W. Linville <linville@...driver.com>
Cc: Holger Schurig <hs4233@...l.mn-solutions.de>
Cc: Bing Zhao <bzhao@...vell.com>
Cc: libertas-dev@...ts.infradead.org
Cc: linux-wireless@...r.kernel.org
Cc: linux-mmc@...r.kernel.org
Acked-by: Dan Williams <dcbw@...hat.com>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/wireless/libertas/if_sdio.c |   22 ++++++++++++++++++++++
 include/linux/mmc/sdio.h                |    2 ++
 2 files changed, 24 insertions(+)

--- a/drivers/net/wireless/libertas/if_sdio.c
+++ b/drivers/net/wireless/libertas/if_sdio.c
@@ -35,6 +35,8 @@
 #include <linux/mmc/card.h>
 #include <linux/mmc/sdio_func.h>
 #include <linux/mmc/sdio_ids.h>
+#include <linux/mmc/sdio.h>
+#include <linux/mmc/host.h>
 
 #include "host.h"
 #include "decl.h"
@@ -943,6 +945,7 @@ static int if_sdio_probe(struct sdio_fun
 	int ret, i;
 	unsigned int model;
 	struct if_sdio_packet *packet;
+	struct mmc_host *host = func->card->host;
 
 	lbs_deb_enter(LBS_DEB_SDIO);
 
@@ -1023,6 +1026,25 @@ static int if_sdio_probe(struct sdio_fun
 	if (ret)
 		goto disable;
 
+	/* For 1-bit transfers to the 8686 model, we need to enable the
+	 * interrupt flag in the CCCR register. Set the MMC_QUIRK_LENIENT_FN0
+	 * bit to allow access to non-vendor registers. */
+	if ((card->model == IF_SDIO_MODEL_8686) &&
+	    (host->caps & MMC_CAP_SDIO_IRQ) &&
+	    (host->ios.bus_width == MMC_BUS_WIDTH_1)) {
+		u8 reg;
+
+		func->card->quirks |= MMC_QUIRK_LENIENT_FN0;
+		reg = sdio_f0_readb(func, SDIO_CCCR_IF, &ret);
+		if (ret)
+			goto release_int;
+
+		reg |= SDIO_BUS_ECSI;
+		sdio_f0_writeb(func, reg, SDIO_CCCR_IF, &ret);
+		if (ret)
+			goto release_int;
+	}
+
 	card->ioport = sdio_readb(func, IF_SDIO_IOPORT, &ret);
 	if (ret)
 		goto release_int;
--- a/include/linux/mmc/sdio.h
+++ b/include/linux/mmc/sdio.h
@@ -94,6 +94,8 @@
 
 #define  SDIO_BUS_WIDTH_1BIT	0x00
 #define  SDIO_BUS_WIDTH_4BIT	0x02
+#define  SDIO_BUS_ECSI		0x20	/* Enable continuous SPI interrupt */
+#define  SDIO_BUS_SCSI		0x40	/* Support continuous SPI interrupt */
 
 #define  SDIO_BUS_ASYNC_INT	0x20
 


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