From: Todd Poynor <tpoynor@mvista.com>
Date: Tue, 2 Aug 2005 20:36:09 +0000 (+0100)
Subject: [MTD] Pre-CFI Sharp chip driver: Some speedups and cleanups
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1da2c9a638f8af7be3daf1fa8dbd087b3284d16e;p=linux-beck.git

[MTD] Pre-CFI Sharp chip driver: Some speedups and cleanups

Remove useless udelay(100) after status value already read.  Poll
for status OK with reduced udelay if not immediate OK status return.

Fix read and compare of 32-bit status value using 16-bit variable.

Include slab.h since kmalloc/kfree are called.

Signed-off-by: Todd Poynor <tpoynor@mvista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

diff --git a/drivers/mtd/chips/sharp.c b/drivers/mtd/chips/sharp.c
index c3cf0f63bc93..08376dbf5d62 100644
--- a/drivers/mtd/chips/sharp.c
+++ b/drivers/mtd/chips/sharp.c
@@ -4,7 +4,7 @@
  * Copyright 2000,2001 David A. Schleef <ds@schleef.org>
  *           2000,2001 Lineo, Inc.
  *
- * $Id: sharp.c,v 1.14 2004/08/09 13:19:43 dwmw2 Exp $
+ * $Id: sharp.c,v 1.15 2005/08/02 20:36:05 tpoynor Exp $
  *
  * Devices supported:
  *   LH28F016SCT Symmetrical block flash memory, 2Mx8
@@ -31,6 +31,7 @@
 #include <linux/mtd/cfi.h>
 #include <linux/delay.h>
 #include <linux/init.h>
+#include <linux/slab.h>
 
 #define CMD_RESET		0xffffffff
 #define CMD_READ_ID		0x90909090
@@ -214,7 +215,7 @@ static int sharp_probe_map(struct map_info *map,struct mtd_info *mtd)
 /* This function returns with the chip->mutex lock held. */
 static int sharp_wait(struct map_info *map, struct flchip *chip)
 {
-	__u16 status;
+	int status, i;
 	unsigned long timeo = jiffies + HZ;
 	DECLARE_WAITQUEUE(wait, current);
 	int adr = 0;
@@ -227,13 +228,11 @@ retry:
 		map_write32(map,CMD_READ_STATUS,adr);
 		chip->state = FL_STATUS;
 	case FL_STATUS:
-		status = map_read32(map,adr);
-//printk("status=%08x\n",status);
-
-		udelay(100);
-		if((status & SR_READY)!=SR_READY){
-//printk(".status=%08x\n",status);
-			udelay(100);
+		for(i=0;i<100;i++){
+			status = map_read32(map,adr);
+			if((status & SR_READY)==SR_READY)
+				break;
+			udelay(1);
 		}
 		break;
 	default: