path: root/meta/packages/linux/linux-cmx270-2.6.17/mtd_fixes-r0.patch

Index: linux-2.6.17/drivers/mtd/nand/cm-x270.c
===================================================================
--- linux-2.6.17.orig/drivers/mtd/nand/cm-x270.c	2006-07-18 15:40:10.000000000 +0100
+++ linux-2.6.17/drivers/mtd/nand/cm-x270.c	2006-07-19 15:35:18.000000000 +0100
@@ -1,7 +1,13 @@
 /*
- * drivers/mtd/nand/cm-x270.c
+ *  linux/drivers/mtd/nand/cmx270-nand.c
+ *
+ *  Copyright (C) 2006 Compulab, Ltd.
+ *  Mike Rapoport <mike@compulab.co.il>
+ *
+ *  Derived from drivers/mtd/nand/h1910.c
+ *       Copyright (C) 2002 Marius Gröger (mag@sysgo.de)
+ *       Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
  *
- * Copyright (c) 2006, 8D Technologies inc.
  *
  * 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
@@ -9,397 +15,269 @@
  *
  *  Overview:
  *   This is a device driver for the NAND flash device found on the
- *   cm-x270 compulab SBC.
- *
- *  Changelog:
- *  - April 2006, Raphael Assenat <raph@8d.com>:
- *    Creation of the driver.
+ *   CM-X270 board.
  */
 
-#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/module.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/nand.h>
 #include <linux/mtd/partitions.h>
-#include <asm/hardware.h>
+
 #include <asm/io.h>
+#include <asm/irq.h>
+
+#include <asm/arch/hardware.h>
 #include <asm/arch/pxa-regs.h>
-#include <asm/arch/cm-x270.h>
 
+#define GPIO_NAND_CS	(11)
+#define GPIO_NAND_RB	(89)
 
-static struct mtd_info *cmx270_mtd = NULL;
-static void *cmx270_nand_io_base;
-#define OFFSET_BASE	0
-#define OFFSET_CLE	4
-#define OFFSET_ALE	8
-
-#define DEFAULT_NUM_PARTITIONS	1
-static int nr_partitions;
-static struct mtd_partition cmx270_default_partition_info[] = {
-	{
-	.name = "rootfs",
-	.offset = 0,
-	.size = MTDPART_SIZ_FULL,
-	},
-};
+/* This macro needed to ensure in-order operation of GPIO and local
+ * bus. Without both asm command and dummy uncached read there're
+ * states when NAND access is broken. I've looked for such macro(s) in
+ * include/asm-arm but found nothing approptiate.
+ * dmac_clean_range is close, but is makes cache invalidation
+ * unnecessary here and it cannot be used in module
+ */
+#define DRAIN_WB() \
+	do { \
+		unsigned char dummy; \
+		asm volatile ("mcr p15, 0, r0, c7, c10, 4":::"r0"); \
+		dummy=*((unsigned char*)UNCACHED_ADDR); \
+	} while(0)
 
-static void cmx270_nand_hwcontrol(struct mtd_info *mtd, int cmd)
-{
-	udelay(1);
-	switch(cmd)
+/* MTD structure for CM-X270 board */
+static struct mtd_info *cmx270_nand_mtd;
+
+/* remaped IO address of the device */
+static void __iomem *cmx270_nand_io;
+
+/*
+ * Define static partitions for flash device
+ */
+static struct mtd_partition partition_info[] = {
 	{
-		case NAND_CTL_SETNCE:
-			GPCR(CM_X270_GPIO_NAND_CS) = GPIO_bit(CM_X270_GPIO_NAND_CS);
-			break;
-		case NAND_CTL_CLRNCE:
-			GPSR(CM_X270_GPIO_NAND_CS) = GPIO_bit(CM_X270_GPIO_NAND_CS);
-			break;
+		.name	= "cmx270-0",
+		.offset	= 0,
+		.size	= MTDPART_SIZ_FULL
 	}
-	udelay(1);
-}
-
-static int cmx270_nand_device_ready(struct mtd_info *mtd)
-{
-	/* I was getting ecc errors on reads, but adding this delay
-	   made the problem disappear. There is probably a timing 
-	   issue somewhere. */ 
-	//ndelay (500);
-	udelay (25);
+};
+#define NUM_PARTITIONS (ARRAY_SIZE(partition_info))
 
-	return GPLR(CM_X270_GPIO_NAND_RB) & GPIO_bit(CM_X270_GPIO_NAND_RB);
-}
+const char *part_probes[] = { "cmdlinepart", NULL };
 
-static u_char cmx270_nand_read_byte(struct mtd_info *mtd)
+static 	u_char cmx270_read_byte(struct mtd_info *mtd)
 {
 	struct nand_chip *this = mtd->priv;
-//	unsigned long raw = readl(this->IO_ADDR_R);
-	unsigned char res = ( readl(this->IO_ADDR_R) >> 16 ) & 0xff;
-	return res;
-}
 
-static void cmx270_nand_write_byte(struct mtd_info *mtd, u_char byte)
-{
-	struct nand_chip *this = mtd->priv;
-	writel( (byte<<16), this->IO_ADDR_W );
-	udelay(1);
+	return (readl(this->IO_ADDR_R) >> 16);
 }
 
-static void cmx270_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
+static void cmx270_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
 {
 	int i;
 	struct nand_chip *this = mtd->priv;
 
 	for (i=0; i<len; i++)
-		writel((buf[i]<<16), this->IO_ADDR_W);
-	udelay(1);
+		writel((*buf++ << 16), this->IO_ADDR_W);
 }
 
-static void cmx270_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
+static void cmx270_read_buf(struct mtd_info *mtd, u_char *buf, int len)
 {
 	int i;
 	struct nand_chip *this = mtd->priv;
 
 	for (i=0; i<len; i++)
-		buf[i] = (readl(this->IO_ADDR_R) >> 16 ) & 0xff;
-	udelay(1);
+		*buf++ = readl(this->IO_ADDR_R) >> 16;
 }
 
-static int cmx270_nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
+static int cmx270_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
 {
 	int i;
 	struct nand_chip *this = mtd->priv;
 
 	for (i=0; i<len; i++)
-		if (buf[i] != ((readl(this->IO_ADDR_R) >> 16) & 0xff))
+		if (buf[i] != (u_char)(readl(this->IO_ADDR_R) >> 16))
 			return -EFAULT;
-	udelay(1);
 
 	return 0;
 }
 
-static void cmx270_nand_write_ALE(struct mtd_info *mtd, const u_char byte)
+static inline void nand_cs_on(void)
 {
-	struct nand_chip *this = mtd->priv;
-	writel( byte << 16 , this->IO_ADDR_W + OFFSET_ALE);
-	udelay(1);
+	GPCR(GPIO_NAND_CS) = GPIO_bit(GPIO_NAND_CS);
 }
 
-static void cmx270_nand_write_CLE(struct mtd_info *mtd, const u_char byte)
+static void nand_cs_off(void)
 {
-	struct nand_chip *this = mtd->priv;
-	writel( byte << 16 , this->IO_ADDR_W + OFFSET_CLE);
-	udelay(1);
+	DRAIN_WB();
+
+	GPSR(GPIO_NAND_CS) = GPIO_bit(GPIO_NAND_CS);
 }
 
-/* Same as nand_core:nand_command() but with different memory
- * addresses for writing to ALE and CLE and without 16 bit support.
+/*
+ *	hardware specific access to control-lines
  */
-static void cmx270_nand_command(struct mtd_info *mtd, unsigned command, int column, int page_addr)
+static void cmx270_hwcontrol(struct mtd_info *mtd, int cmd)
 {
-	register struct nand_chip *this = mtd->priv;
+       struct nand_chip* this = (struct nand_chip *) (mtd->priv);
+       unsigned int nandaddr = (unsigned int)this->IO_ADDR_R;
 
-//	printk("cmd: 0x%02x col: 0x%x page_addr: 0x%x\n",
-//			command, column, page_addr);
-	
-	if (command == NAND_CMD_SEQIN) {
-		int readcmd;
-
-		if (column >= mtd->oobblock) {
-			/* OOB area */
-			column -= mtd->oobblock;
-			readcmd = NAND_CMD_READOOB;
-		} else if (column < 256) {
-			/* First 256 bytes --> READ0 */
-			readcmd = NAND_CMD_READ0;
-		} else {
-			column -= 256;
-			readcmd = NAND_CMD_READ1;
-		}
-		cmx270_nand_write_CLE(mtd, readcmd);
-	}
-	cmx270_nand_write_CLE(mtd, command);
+       DRAIN_WB();
 
-	if (column != -1 || page_addr != -1) {
-		
-		/* Serially input address */
-		if (column != -1) {
-			cmx270_nand_write_ALE(mtd, column);
-		}
-		if (page_addr != -1) {
-			cmx270_nand_write_ALE(mtd, (unsigned char) (page_addr & 0xff));
-			cmx270_nand_write_ALE(mtd, (unsigned char) ((page_addr >> 8) & 0xff));
-			/* One more address cycle for devices > 32MiB */
-			if (this->chipsize > (32 << 20))
-				cmx270_nand_write_ALE(mtd, (unsigned char) ((page_addr >> 16) & 0x0f));
-		}
-	}
+       switch(cmd) {
 
-	/*
-	 * program and erase have their own busy handlers
-	 * status and sequential in needs no delay
-	 */
-	switch (command) {
-		
-	case NAND_CMD_PAGEPROG:
-	case NAND_CMD_ERASE1:
-	case NAND_CMD_ERASE2:
-	case NAND_CMD_SEQIN:
-	case NAND_CMD_STATUS:
-		return;
-
-	case NAND_CMD_RESET:
-		if (this->dev_ready)
-			break;
-		udelay(this->chip_delay);
-		cmx270_nand_write_CLE(mtd, NAND_CMD_STATUS);
-		while ( !(this->read_byte(mtd) & 0x40));
-		return;
-		
-	/* This applies to read commands */	
-	default:
-		/*
-		 * If we don't have access to the busy pin, we apply the given
-		 * command delay
-		 */
-		if (!this->dev_ready) {
-			udelay(this->chip_delay);
-			return;
-		}
-	}
-	
-	/* Apply this short delay always to ensure that we do wait tWB in
-	 * any case on any machine. */
-	ndelay (100);
-	/* wait until command is processed */
-	while (!this->dev_ready(mtd));
-	ndelay (100);
+       case NAND_CTL_SETCLE:
+               nandaddr |= (1 << 2);
+               this->IO_ADDR_R = (void __iomem*)nandaddr;
+               this->IO_ADDR_W = (void __iomem*)nandaddr;
+               break;
+       case NAND_CTL_CLRCLE:
+               nandaddr &= ~(1 << 2);
+               this->IO_ADDR_R = (void __iomem*)nandaddr;
+               this->IO_ADDR_W = (void __iomem*)nandaddr;
+               break;
+
+       case NAND_CTL_SETALE:
+               nandaddr |= (1 << 3);
+               this->IO_ADDR_R = (void __iomem*)nandaddr;
+               this->IO_ADDR_W = (void __iomem*)nandaddr;
+               break;
+       case NAND_CTL_CLRALE:
+               nandaddr &= ~(1 << 3);
+               this->IO_ADDR_R = (void __iomem*)nandaddr;
+               this->IO_ADDR_W = (void __iomem*)nandaddr;
+               break;
+
+       case NAND_CTL_SETNCE:
+               nand_cs_on();
+               break;
+       case NAND_CTL_CLRNCE:
+               nand_cs_off();
+               break;
+       }
+
+       DRAIN_WB();
 }
 
-/* Same as nand_core:nand_command_lp() but with different memory
- * addresses for writing to ALE and CLE and without 16 bit support.
+
+/*
+ *	read device ready pin
  */
-static void cmx270_nand_command_lp (struct mtd_info *mtd, unsigned command, int column, int page_addr)
+static int cmx270_device_ready(struct mtd_info *mtd)
 {
-	register struct nand_chip *this = mtd->priv;
-
-	/* Emulate NAND_CMD_READOOB */
-	if (command == NAND_CMD_READOOB) {
-		column += mtd->oobblock;
-		command = NAND_CMD_READ0;
-//		printk("Read OOB: column: $%x, page: $%x\n", column, page_addr);
-	}
-		
-	/* Write out the command to the device. */
-	cmx270_nand_write_CLE(mtd, command);	
-
-	if (column != -1 || page_addr != -1) {
-
-		/* Serially input address */
-		if (column != -1) {
-			cmx270_nand_write_ALE(mtd, column & 0xff);
-			cmx270_nand_write_ALE(mtd, column >> 8);
-			if ((column >> 8) > 0xf) {
-				printk("out of range column\n");
-			}
-		}	
-		if (page_addr != -1) {
-			cmx270_nand_write_ALE(mtd, (unsigned char) (page_addr & 0xff));
-			cmx270_nand_write_ALE(mtd, (unsigned char) ((page_addr >> 8) & 0xff));
-			/* One more address cycle for devices > 128MiB */
-			if (this->chipsize > (128 << 20)) {
-				cmx270_nand_write_ALE(mtd, (unsigned char) ((page_addr >> 16) & 0xff));
-			}
-		}
-	}
+	DRAIN_WB();
 
-	udelay(1);
-	
-	/* 
-	 * program and erase have their own busy handlers 
-	 * status and sequential in needs no delay
-	*/
-	switch (command) {
-			
-	case NAND_CMD_CACHEDPROG:
-	case NAND_CMD_PAGEPROG:
-	case NAND_CMD_ERASE1:
-	case NAND_CMD_ERASE2:
-	case NAND_CMD_SEQIN:
-	case NAND_CMD_STATUS:
-	case NAND_CMD_DEPLETE1:
-		return;
-
-	/* 
-	 * read error status commands require only a short delay
-	 */
-	case NAND_CMD_STATUS_ERROR:
-	case NAND_CMD_STATUS_ERROR0:
-	case NAND_CMD_STATUS_ERROR1:
-	case NAND_CMD_STATUS_ERROR2:
-	case NAND_CMD_STATUS_ERROR3:
-		udelay(this->chip_delay);
-		return;
-
-	case NAND_CMD_RESET:
-		if (this->dev_ready)	
-			break;
-		udelay(this->chip_delay);
-		cmx270_nand_write_CLE(mtd, NAND_CMD_STATUS);
-		while ( !(this->read_byte(mtd) & NAND_STATUS_READY));
-		return;
-
-	case NAND_CMD_READ0:
-		/* Write out the start read command */
-		cmx270_nand_write_CLE(mtd, NAND_CMD_READSTART);
-		/* Fall through into ready check */
-		
-	/* This applies to read commands */	
-	default:
-		/* 
-		 * If we don't have access to the busy pin, we apply the given
-		 * command delay
-		*/
-		if (!this->dev_ready) {
-			udelay (this->chip_delay);
-			return;
-		}	
-	}
-
-	/* Apply this short delay always to ensure that we do wait tWB in
-	 * any case on any machine. */
-	ndelay (100);
-	/* wait until command is processed */
-	while (!this->dev_ready(mtd));
+	return (GPLR(GPIO_NAND_RB) & GPIO_bit(GPIO_NAND_RB));
 }
 
-
-#ifdef CONFIG_MTD_PARTITIONS
-const char *part_probes[] = { "cmdlinepart", NULL };
-#endif
-
-int __init cmx270_nand_init(void)
+/*
+ * Main initialization routine
+ */
+static int __devinit cmx270_init(void)
 {
 	struct nand_chip *this;
-	struct mtd_partition* cmx270_partition_info;
-	int err = 0;
-
-	pxa_gpio_mode(CM_X270_GPIO_NAND_RB);
+	const char *part_type;
+	struct mtd_partition *mtd_parts;
+	int mtd_parts_nb = 0;
+	int ret;
 
-	GPSR(CM_X270_GPIO_NAND_CS) = GPIO_bit(CM_X270_GPIO_NAND_CS);
-	pxa_gpio_mode(CM_X270_GPIO_NAND_CS | GPIO_OUT);
-	
 	/* Allocate memory for MTD device structure and private data */
-	cmx270_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip),
-					GFP_KERNEL);
-	if (!cmx270_mtd) {
-		printk(KERN_WARNING "Unable to allocate cm-x270 NAND mtd device structure.\n");
-		err = -ENOMEM;
-		goto out;
+	cmx270_nand_mtd = kzalloc(sizeof(struct mtd_info) +
+				  sizeof(struct nand_chip),
+				  GFP_KERNEL);
+	if (!cmx270_nand_mtd) {
+		printk("Unable to allocate CM-X270 NAND MTD device structure.\n");
+		return -ENOMEM;
 	}
 
-	/* map physical address */
-	cmx270_nand_io_base = ioremap(CM_X270_NAND_PHYS, 0x100);
-	if (!cmx270_nand_io_base) {
-		err = -EIO;
-		goto out_mtd;
+	cmx270_nand_io = ioremap(PXA_CS1_PHYS, 12);
+	if (!cmx270_nand_io) {
+		printk("Unable to ioremap NAND device\n");
+		ret = -EINVAL;
+		goto err1;
 	}
 
 	/* Get pointer to private data */
-	this = (struct nand_chip *)(&cmx270_mtd[1]);
-	
-	/* Initialize structures */
-	memset((char *) cmx270_mtd, 0, sizeof(struct mtd_info));
-	memset((char *) this, 0, sizeof(struct nand_chip));
+	this = (struct nand_chip *)(&cmx270_nand_mtd[1]);
 
 	/* Link the private data with the MTD structure */
-	cmx270_mtd->priv = this;
+	cmx270_nand_mtd->owner = THIS_MODULE;
+	cmx270_nand_mtd->priv = this;
 
-	this->IO_ADDR_R = cmx270_nand_io_base;
-	this->IO_ADDR_W = cmx270_nand_io_base;
-	this->read_byte = cmx270_nand_read_byte;
-	this->write_byte = cmx270_nand_write_byte;
-	this->write_buf = cmx270_nand_write_buf;
-	this->read_buf = cmx270_nand_read_buf;
-	this->verify_buf = cmx270_nand_verify_buf;
-	this->hwcontrol = cmx270_nand_hwcontrol;
-	this->dev_ready = cmx270_nand_device_ready;
-	this->cmdfunc = cmx270_nand_command_lp;
-	this->chip_delay = 25;
+	/* insert callbacks */
+	this->IO_ADDR_R = cmx270_nand_io;
+	this->IO_ADDR_W = cmx270_nand_io;
+	this->hwcontrol = cmx270_hwcontrol;
+	this->dev_ready = cmx270_device_ready;
+
+	/* 15 us command delay time */
+	this->chip_delay = 20;
 	this->eccmode = NAND_ECC_SOFT;
 
-	/* Scan to find existance of the device */
-	if (nand_scan(cmx270_mtd, 1)) {
-		err = -ENXIO;
-		goto out_ior;
+	/* read/write functions */
+	this->read_byte = cmx270_read_byte;
+	this->read_buf = cmx270_read_buf;
+	this->write_buf = cmx270_write_buf;
+	this->verify_buf = cmx270_verify_buf;
+
+	/* Scan to find existence of the device */
+	if (nand_scan (cmx270_nand_mtd, 1)) {
+		printk(KERN_NOTICE "No NAND device\n");
+		ret = -ENXIO;
+		goto err2;
+	}
+
+#ifdef CONFIG_MTD_CMDLINE_PARTS
+	mtd_parts_nb = parse_mtd_partitions(cmx270_nand_mtd, part_probes,
+					    &mtd_parts, 0);
+	if (mtd_parts_nb > 0)
+		part_type = "command line";
+	else
+		mtd_parts_nb = 0;
+#endif
+	if (!mtd_parts_nb) {
+		mtd_parts = partition_info;
+		mtd_parts_nb = NUM_PARTITIONS;
+		part_type = "static";
 	}
 
 	/* Register the partitions */
-	cmx270_mtd->name = "cmx270-mtd";
-	nr_partitions = parse_mtd_partitions(cmx270_mtd, part_probes, &cmx270_partition_info, 0);
-	if (nr_partitions <= 0) {
-		nr_partitions = DEFAULT_NUM_PARTITIONS;
-		cmx270_partition_info = cmx270_default_partition_info;
-	}
+	printk(KERN_NOTICE "Using %s partition definition\n", part_type);
+	ret = add_mtd_partitions(cmx270_nand_mtd, mtd_parts, mtd_parts_nb);
+	if (ret)
+		goto err2;
+
+	/* Return happy */
+	return 0;
+
+err2:
+	iounmap(cmx270_nand_io);
+err1:
+	kfree(cmx270_nand_mtd);
+
+	return ret;
 
-	add_mtd_partitions(cmx270_mtd, cmx270_partition_info, nr_partitions);
-	
-	goto out;
-	
-out_ior:	
-	iounmap((void*) cmx270_nand_io_base);
-out_mtd:	
-	kfree(cmx270_mtd);
-out:
-	return err;
 }
-module_init(cmx270_nand_init);
+module_init(cmx270_init);
 
-static void __exit cmx270_nand_cleanup(void)
+/*
+ * Clean up routine
+ */
+static void __devexit cmx270_cleanup(void)
 {
-	nand_release(cmx270_mtd);
-	kfree(cmx270_mtd);	
+	/* Release resources, unregister device */
+	nand_release(cmx270_nand_mtd);
+
+	iounmap(cmx270_nand_io);
+
+	/* Free the MTD device structure */
+	kfree (cmx270_nand_mtd);
 }
+module_exit(cmx270_cleanup);
 
 MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Raphael Assenat <raph@8d.com>");
-MODULE_DESCRIPTION("NAND flash driver for cm-x270 boards");
-
+MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
+MODULE_DESCRIPTION("NAND flash driver for Compulab CM-X270 Module");