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From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
To: barebox@lists.infradead.org
Subject: [PATCH 5/7] smc911x: improve detection handle
Date: Wed, 29 Aug 2012 07:06:16 +0200	[thread overview]
Message-ID: <1346216778-14100-5-git-send-email-plagnioj@jcrosoft.com> (raw)
In-Reply-To: <1346216778-14100-1-git-send-email-plagnioj@jcrosoft.com>

detect if the bus is swapped and report a 32bit drivers is used on a 16bit bus

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 drivers/net/smc911x.c |   20 +++++++++++++++++++-
 drivers/net/smc911x.h |    2 ++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/net/smc911x.c b/drivers/net/smc911x.c
index 75a332e..17f365d 100644
--- a/drivers/net/smc911x.c
+++ b/drivers/net/smc911x.c
@@ -470,9 +470,27 @@ static int smc911x_probe(struct device_d *dev)
 	}
 
 	val = smc911x_reg_read(priv, BYTE_TEST);
-	if(val != 0x87654321) {
+	if (val == 0x43218765) {
+		dev_info(dev, "BYTE_TEST looks swapped, "
+			   "applying WORD_SWAP");
+		smc911x_reg_write(priv, WORD_SWAP, 0xffffffff);
+
+		/* 1 dummy read of BYTE_TEST is needed after a write to
+		 * WORD_SWAP before its contents are valid */
+		val = smc911x_reg_read(priv, BYTE_TEST);
+
+		val = smc911x_reg_read(priv, BYTE_TEST);
+	}
+
+	if (val != 0x87654321) {
 		dev_err(dev, "no smc911x found on 0x%p (byte_test=0x%08x)\n",
 			priv->base, val);
+		if (((val >> 16) & 0xFFFF) == (val & 0xFFFF)) {
+			dev_err(dev, "top 16 bits equal to bottom 16 bits\n");
+			dev_err(dev,
+				   "This may mean the chip is set "
+				   "for 32 bit while the bus is reading 16 bit\n");
+		}
 		return -ENODEV;
 	}
 
diff --git a/drivers/net/smc911x.h b/drivers/net/smc911x.h
index baf3598..d409247 100644
--- a/drivers/net/smc911x.h
+++ b/drivers/net/smc911x.h
@@ -26,6 +26,8 @@
  * of the Lan911x memory space
  */
 
+#define WORD_SWAP		0x98
+
 #define RX_DATA_FIFO		 0x00
 
 #define TX_DATA_FIFO		 0x20
-- 
1.7.10.4


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  parent reply	other threads:[~2012-08-29  5:06 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-08-29  4:27 [PATCH 0/7 2] smsc911x: runtime configuration improvement Jean-Christophe PLAGNIOL-VILLARD
2012-08-29  5:06 ` [PATCH 1/7] smc911x: move register define to smc911x.h Jean-Christophe PLAGNIOL-VILLARD
2012-08-29  5:06   ` [PATCH 2/7] smc911x: introduce read/write ops Jean-Christophe PLAGNIOL-VILLARD
2012-08-29  5:06   ` [PATCH 3/7] smc911x: add 16bit bus width support Jean-Christophe PLAGNIOL-VILLARD
2012-08-29  5:06   ` [PATCH 4/7] smc911x: add support to pass the shift via platform data Jean-Christophe PLAGNIOL-VILLARD
2012-08-29  5:06   ` Jean-Christophe PLAGNIOL-VILLARD [this message]
2012-08-29  6:52     ` [PATCH 5/7] smc911x: improve detection handle Sascha Hauer
2012-08-29  8:36       ` Jean-Christophe PLAGNIOL-VILLARD
2012-08-29  9:04         ` Sascha Hauer
2012-08-29  5:06   ` [PATCH 6/7] smc911x: update chip detection Jean-Christophe PLAGNIOL-VILLARD
2012-08-29  5:06   ` [PATCH 7/7] smm911x: check if the device is ready before using it Jean-Christophe PLAGNIOL-VILLARD
2012-08-29  6:53     ` Sascha Hauer
2012-08-29  8:35       ` Jean-Christophe PLAGNIOL-VILLARD
2012-08-29  9:04         ` Sascha Hauer
2012-08-29 10:07     ` Christian Hemp
  -- strict thread matches above, loose matches on Subject: below --
2012-09-01  8:47 [PATCH 0/7 v3] smsc911x: runtime configuration improvement Jean-Christophe PLAGNIOL-VILLARD
2012-09-01  8:52 ` [PATCH 1/7] smc911x: move register define to smc911x.h Jean-Christophe PLAGNIOL-VILLARD
2012-09-01  8:52   ` [PATCH 5/7] smc911x: improve detection handle Jean-Christophe PLAGNIOL-VILLARD
2012-08-14 17:25 [PATCH 0/7] smsc911x: runtime configuration improvement Jean-Christophe PLAGNIOL-VILLARD
2012-08-14 17:32 ` [PATCH 1/7] smc911x: move register define to smc911x.h Jean-Christophe PLAGNIOL-VILLARD
2012-08-14 17:32   ` [PATCH 5/7] smc911x: improve detection handle Jean-Christophe PLAGNIOL-VILLARD

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