[MTD] NAND: Alchemy board driver cleanup

- cleaned up the partitions and include files
- added more flexible CS and address detection and setup

Regression tested on db1200 and db1550.
Signed-off-by: NPete Popov <ppopov@pacbell.net>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

drivers/mtd/nand/Kconfig

 # drivers/mtd/nand/Kconfig
-# $Id: Kconfig,v 1.31 2005/06/20 12:03:21 bjd Exp $
+# $Id: Kconfig,v 1.34 2005/09/23 01:44:55 ppopov Exp $
 
 menu "NAND Flash Device Drivers"
 	depends on MTD!=n
@@ -59,8 +59,8 @@ config MTD_NAND_IDS
 	tristate
 
 config MTD_NAND_AU1550
-	tristate "Au1550 NAND support"
-	depends on SOC_AU1550 && MTD_NAND
+	tristate "Au1550/1200 NAND support"
+	depends on (SOC_AU1200 || SOC_AU1550) && MTD_NAND
 	help
 	  This enables the driver for the NAND flash controller on the
 	  AMD/Alchemy 1550 SOC.

drivers/mtd/nand/au1550nd.c

@@ -3,7 +3,7 @@
  *
  *  Copyright (C) 2004 Embedded Edge, LLC
  *
- * $Id: au1550nd.c,v 1.11 2004/11/04 12:53:10 gleixner Exp $
+ * $Id: au1550nd.c,v 1.12 2005/09/23 01:44:55 ppopov Exp $
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -21,13 +21,7 @@
 
 /* fixme: this is ugly */
 #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 0)
-#include <asm/mach-au1x00/au1000.h>
-#ifdef CONFIG_MIPS_PB1550
-#include <asm/mach-pb1x00/pb1550.h> 
-#endif
-#ifdef CONFIG_MIPS_DB1550
-#include <asm/mach-db1x00/db1x00.h> 
-#endif
+#include <asm/mach-au1x00/au1xxx.h>
 #else
 #include <asm/au1000.h>
 #ifdef CONFIG_MIPS_PB1550
@@ -45,39 +39,22 @@ static struct mtd_info *au1550_mtd = NULL;
 static void __iomem *p_nand;
 static int nand_width = 1; /* default x8*/
 
-#define NAND_CS 1
-
 /*
  * Define partitions for flash device
  */
 const static struct mtd_partition partition_info[] = {
-#ifdef CONFIG_MIPS_PB1550
-#define NUM_PARTITIONS            2
-	{ 
-		.name = "Pb1550 NAND FS 0",
-	  	.offset = 0,
-	  	.size = 8*1024*1024 
-	},
-	{ 
-		.name = "Pb1550 NAND FS 1",
-		.offset =  MTDPART_OFS_APPEND,
- 		.size =    MTDPART_SIZ_FULL
-	}
-#endif
-#ifdef CONFIG_MIPS_DB1550
-#define NUM_PARTITIONS            2
 	{ 
-		.name = "Db1550 NAND FS 0",
+		.name 	= "NAND FS 0",
 	  	.offset = 0,
-	  	.size = 8*1024*1024 
+	  	.size 	= 8*1024*1024 
 	},
 	{ 
-		.name = "Db1550 NAND FS 1",
+		.name 	= "NAND FS 1",
 		.offset =  MTDPART_OFS_APPEND,
- 		.size =    MTDPART_SIZ_FULL
+ 		.size 	=    MTDPART_SIZ_FULL
 	}
-#endif
 };
+#define NB_OF(x)  (sizeof(x)/sizeof(x[0]))
 
 
 /**
@@ -339,11 +316,13 @@ int au1550_device_ready(struct mtd_info *mtd)
 /*
  * Main initialization routine
  */
-int __init au1550_init (void)
+int __init au1xxx_nand_init (void)
 {
 	struct nand_chip *this;
 	u16 boot_swapboot = 0; /* default value */
 	int retval;
+	u32 mem_staddr;
+	u32 nand_phys;
 
 	/* Allocate memory for MTD device structure and private data */
 	au1550_mtd = kmalloc (sizeof(struct mtd_info) + 
@@ -364,8 +343,11 @@ int __init au1550_init (void)
 	au1550_mtd->priv = this;
 
 
-	/* MEM_STNDCTL: disable ints, disable nand boot */
-	au_writel(0, MEM_STNDCTL);
+	/* disable interrupts */
+	au_writel(au_readl(MEM_STNDCTL) & ~(1<<8), MEM_STNDCTL);
+ 
+	/* disable NAND boot */
+	au_writel(au_readl(MEM_STNDCTL) & ~(1<<0), MEM_STNDCTL);
 
 #ifdef CONFIG_MIPS_PB1550
 	/* set gpio206 high */
@@ -397,19 +379,60 @@ int __init au1550_init (void)
 	}
 #endif
 
-	/* Configure RCE1 - should be done by YAMON */
-	au_writel(0x5 | (nand_width << 22), 0xB4001010); /* MEM_STCFG1 */
-	au_writel(NAND_TIMING, 0xB4001014); /* MEM_STTIME1 */
-	au_sync();
+	/* Configure chip-select; normally done by boot code, e.g. YAMON */
+#ifdef NAND_STCFG
+	if (NAND_CS == 0) {
+		au_writel(NAND_STCFG,  MEM_STCFG0);
+		au_writel(NAND_STTIME, MEM_STTIME0);
+		au_writel(NAND_STADDR, MEM_STADDR0);
+	}
+	if (NAND_CS == 1) {
+		au_writel(NAND_STCFG,  MEM_STCFG1);
+		au_writel(NAND_STTIME, MEM_STTIME1);
+		au_writel(NAND_STADDR, MEM_STADDR1);
+	}
+	if (NAND_CS == 2) {
+		au_writel(NAND_STCFG,  MEM_STCFG2);
+		au_writel(NAND_STTIME, MEM_STTIME2);
+		au_writel(NAND_STADDR, MEM_STADDR2);
+	}
+	if (NAND_CS == 3) {
+		au_writel(NAND_STCFG,  MEM_STCFG3);
+		au_writel(NAND_STTIME, MEM_STTIME3);
+		au_writel(NAND_STADDR, MEM_STADDR3);
+	}
+#endif
+ 
+	/* Locate NAND chip-select in order to determine NAND phys address */
+	mem_staddr = 0x00000000;
+	if (((au_readl(MEM_STCFG0) & 0x7) == 0x5) && (NAND_CS == 0))
+		mem_staddr = au_readl(MEM_STADDR0);
+	else if (((au_readl(MEM_STCFG1) & 0x7) == 0x5) && (NAND_CS == 1))
+		mem_staddr = au_readl(MEM_STADDR1);
+	else if (((au_readl(MEM_STCFG2) & 0x7) == 0x5) && (NAND_CS == 2))
+		mem_staddr = au_readl(MEM_STADDR2);
+	else if (((au_readl(MEM_STCFG3) & 0x7) == 0x5) && (NAND_CS == 3))
+		mem_staddr = au_readl(MEM_STADDR3);
+
+	if (mem_staddr == 0x00000000) {
+		printk("Au1xxx NAND: ERROR WITH NAND CHIP-SELECT\n");
+		kfree(au1550_mtd);
+		return 1;
+	}
+	nand_phys = (mem_staddr << 4) & 0xFFFC0000;
 
-	/* setup and enable chip select, MEM_STADDR1 */
-	/* we really need to decode offsets only up till 0x20 */
-	au_writel((1<<28) | (NAND_PHYS_ADDR>>4) | 
-			(((NAND_PHYS_ADDR + 0x1000)-1) & (0x3fff<<18)>>18), 
-			MEM_STADDR1);
-	au_sync();
+	p_nand = (void __iomem *)ioremap(nand_phys, 0x1000);
+
+	/* make controller and MTD agree */
+	if (NAND_CS == 0)
+		nand_width = au_readl(MEM_STCFG0) & (1<<22);
+	if (NAND_CS == 1)
+		nand_width = au_readl(MEM_STCFG1) & (1<<22);
+	if (NAND_CS == 2)
+		nand_width = au_readl(MEM_STCFG2) & (1<<22);
+	if (NAND_CS == 3)
+		nand_width = au_readl(MEM_STCFG3) & (1<<22);
 
-	p_nand = ioremap(NAND_PHYS_ADDR, 0x1000);
 
 	/* Set address of hardware control function */
 	this->hwcontrol = au1550_hwcontrol;
@@ -438,7 +461,7 @@ int __init au1550_init (void)
 	}
 
 	/* Register the partitions */
-	add_mtd_partitions(au1550_mtd, partition_info, NUM_PARTITIONS);
+	add_mtd_partitions(au1550_mtd, partition_info, NB_OF(partition_info));
 
 	return 0;
 
@@ -450,7 +473,7 @@ int __init au1550_init (void)
 	return retval;
 }
 
-module_init(au1550_init);
+module_init(au1xxx_nand_init);
 
 /*
  * Clean up routine