netdev - [PATCH 17/21] ARCNET: com20020: replace magic numbers with readable macros

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Message-Id: <1429896055-31680-18-git-send-email-m.grzeschik@pengutronix.de>
Date:	Fri, 24 Apr 2015 19:20:51 +0200
From:	Michael Grzeschik <m.grzeschik@...gutronix.de>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel@...gutronix.de
Subject: [PATCH 17/21] ARCNET: com20020: replace magic numbers with readable macros

This patch replaces all magic numbers in the driver with
proper named macros. For the case of XTOcfg and STARTIOcmd
it introduces the new macros.

Signed-off-by: Michael Grzeschik <m.grzeschik@...gutronix.de>
---
 drivers/net/arcnet/com20020.c | 21 +++++++++++----------
 include/linux/arcdevice.h     |  1 +
 include/linux/com20020.h      |  1 +
 3 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/net/arcnet/com20020.c b/drivers/net/arcnet/com20020.c
index 4b4bb96..27ad484 100644
--- a/drivers/net/arcnet/com20020.c
+++ b/drivers/net/arcnet/com20020.c
@@ -92,9 +92,9 @@ int com20020_check(struct net_device *dev)
 	struct arcnet_local *lp = netdev_priv(dev);
 
 	/* reset the card */
-	outb(0x18 | 0x80, ioaddr + _CONFIG);
+	outb(XTOcfg(3) | RESETcfg, ioaddr + _CONFIG);
 	udelay(5);
-	outb(0x18, ioaddr + _CONFIG);
+	outb(XTOcfg(3), ioaddr + _CONFIG);
 	mdelay(RESETtime);
 
 	lp->setup = lp->clockm ? 0 : (lp->clockp << 1);
@@ -115,13 +115,13 @@ int com20020_check(struct net_device *dev)
 
 		/* must now write the magic "restart operation" command */
 		mdelay(1);
-		outb(0x18, ioaddr + _COMMAND);
+		outb(STARTIOcmd, ioaddr + _COMMAND);
 	}
 
-	lp->config = 0x21 | (lp->timeout << 3) | (lp->backplane << 2);
+	lp->config = TXENcfg | (lp->timeout << 3) | (lp->backplane << 2) | SUB_NODE;
 	/* set node ID to 0x42 (but transmitter is disabled, so it's okay) */
 	outb(lp->config, ioaddr + _CONFIG);
-	outb(0x42, ioaddr + BUS_ALIGN*7);
+	outb(0x42, ioaddr + _XREG);
 
 	status = inb(ioaddr + _STATUS);
 
@@ -132,8 +132,9 @@ int com20020_check(struct net_device *dev)
 	BUGMSG(D_INIT_REASONS, "status after reset: %X\n", status);
 
 	/* Enable TX */
-	outb(0x39, ioaddr + _CONFIG);
-	outb(inb(ioaddr + BUS_ALIGN*8), ioaddr + BUS_ALIGN*7);
+	lp->config |= TXENcfg;
+	outb(lp->config, ioaddr + _CONFIG);
+	outb(inb(ioaddr + BUS_ALIGN * 8), ioaddr + _XREG);
 
 	outb((CFLAGScmd | RESETclear | CONFIGclear), ioaddr + _COMMAND);
 
@@ -212,10 +213,10 @@ int com20020_found(struct net_device *dev, int shared)
 
 		/* must now write the magic "restart operation" command */
 		mdelay(1);
-		outb(0x18, ioaddr + _COMMAND);
+		outb(STARTIOcmd, ioaddr + _COMMAND);
 	}
 
-	lp->config = 0x20 | (lp->timeout << 3) | (lp->backplane << 2) | 1;
+	lp->config = TXENcfg | (lp->timeout << 3) | (lp->backplane << 2) | SUB_NODE;
 	/* Default 0x38 + register: Node ID */
 	outb(lp->config, ioaddr + _CONFIG);
 	outb(dev->dev_addr[0], ioaddr + _XREG);
@@ -276,7 +277,7 @@ static int com20020_reset(struct net_device *dev, int really_reset)
 
 	if (really_reset) {
 		/* reset the card */
-		outb(lp->config | 0x80, ioaddr + _CONFIG);
+		outb(lp->config | RESETcfg, ioaddr + _CONFIG);
 		udelay(5);
 		outb(lp->config, ioaddr + _CONFIG);
 		mdelay(RESETtime * 2);	/* COM20020 seems to be slower sometimes */
diff --git a/include/linux/arcdevice.h b/include/linux/arcdevice.h
index c20f100..bc3b085 100644
--- a/include/linux/arcdevice.h
+++ b/include/linux/arcdevice.h
@@ -155,6 +155,7 @@ extern int arcnet_debug;
 #define CONFIGcmd       0x05	/* define configuration */
 #define CFLAGScmd       0x06	/* clear flags */
 #define TESTcmd         0x07	/* load test flags */
+#define STARTIOcmd      0x18	/* start internal operation */
 
 /* flags for "clear flags" command */
 #define RESETclear      0x08	/* power-on-reset */
diff --git a/include/linux/com20020.h b/include/linux/com20020.h
index c2d8647..f194b74 100644
--- a/include/linux/com20020.h
+++ b/include/linux/com20020.h
@@ -92,6 +92,7 @@ struct com20020_dev {
 /* in the CONFIG register */
 #define RESETcfg	0x80	/* put card in reset state */
 #define TXENcfg		0x20	/* enable TX */
+#define XTOcfg(x)	((x) << 3)	/* extended timeout */
 
 /* in SETUP register */
 #define PROMISCset	0x10	/* enable RCV_ALL */
-- 
2.1.4

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