netdev - [PATCH 8/8] macb: support data bus widths

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Date:	Thu, 10 Mar 2011 10:10:43 +0000
From:	Jamie Iles <jamie@...ieiles.com>
To:	netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:	nicolas.ferre@...el.com, Jamie Iles <jamie@...ieiles.com>
Subject: [PATCH 8/8] macb: support data bus widths > 32 bits

Some GEM implementations may support data bus widths up to 128 bits.
Allow the platform data to specify the data bus width and let the driver
program it up.

Signed-off-by: Jamie Iles <jamie@...ieiles.com>
---
 drivers/net/macb.c                 |    5 +++++
 drivers/net/macb.h                 |    3 +++
 include/linux/platform_data/macb.h |    6 ++++++
 3 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/drivers/net/macb.c b/drivers/net/macb.c
index 2965405..6ecbd69 100644
--- a/drivers/net/macb.c
+++ b/drivers/net/macb.c
@@ -797,6 +797,7 @@ static void macb_reset_hw(struct macb *bp)
 static void macb_init_hw(struct macb *bp)
 {
 	u32 config;
+	struct eth_platform_data *pdata = dev_get_platdata(&bp->pdev->dev);
 
 	macb_reset_hw(bp);
 	__macb_set_hwaddr(bp);
@@ -810,6 +811,8 @@ static void macb_init_hw(struct macb *bp)
 		config |= MACB_BIT(CAF);	/* Copy All Frames */
 	if (!(bp->dev->flags & IFF_BROADCAST))
 		config |= MACB_BIT(NBC);	/* No BroadCast */
+	if (bp->is_gem)
+		config |= GEM_BF(DBW, pdata->dbw);	/* Data bus width. */
 	macb_writel(bp, NCFGR, config);
 
 	/* Initialize TX and RX buffers */
@@ -1292,6 +1295,8 @@ static int __macb_probe(struct platform_device *pdev, int is_gem)
 	pclk_hz = clk_get_rate(bp->pclk);
 	config = bp->is_gem ? gem_mdc_clk_div(pclk_hz) :
 		macb_mdc_clk_div(pclk_hz);
+	if (bp->is_gem)
+		config |= GEM_BF(DBW, pdata->dbw);	/* Data bus width. */
 	macb_writel(bp, NCFGR, config);
 
 	macb_get_hwaddr(bp);
diff --git a/drivers/net/macb.h b/drivers/net/macb.h
index bc2e2c0..cd63c1b 100644
--- a/drivers/net/macb.h
+++ b/drivers/net/macb.h
@@ -134,6 +134,9 @@
 /* GEM specific NCFGR bitfields. */
 #define GEM_CLK_OFFSET				18
 #define GEM_CLK_SIZE				3
+#define GEM_DBW_OFFSET				21
+#define GEM_DBW_SIZE				2
+
 /* Bitfields in NSR */
 #define MACB_NSR_LINK_OFFSET			0
 #define MACB_NSR_LINK_SIZE			1
diff --git a/include/linux/platform_data/macb.h b/include/linux/platform_data/macb.h
index ae18579..d11bfab 100644
--- a/include/linux/platform_data/macb.h
+++ b/include/linux/platform_data/macb.h
@@ -1,11 +1,17 @@
 #ifndef __MACB_PDATA_H__
 #define __MACB_PDATA_H__
 
+/* Constants for data bus width. */
+#define MACB_DBW32				0
+#define MACB_DBW64				1
+#define MACB_DBW128				2
+
 struct eth_platform_data {
 	u32		phy_mask;
 	u8		phy_irq_pin;	/* PHY IRQ */
 	u8		is_rmii;	/* using RMII interface? */
 	int		have_hclk;	/* have hclk as well as pclk */
+	u8		dbw;		/* Data bus width. */
 };
 
 #endif /* __MACB_PDATA_H__ */
-- 
1.7.4

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