path: root/packages/linux/compulab-pxa270-2.6.20/0004-nand-driver.patch

From nobody Mon Sep 17 00:00:00 2001
From: Cliff Brake <cbrake@happy.dev.bec-systems.com>
Date: Tue Apr 3 11:38:59 2007 -0400
Subject: [PATCH] nand driver

2.6.20 NAND flash driver for cm-x270

---

 drivers/mtd/nand/Kconfig       |    4 +
 drivers/mtd/nand/Makefile      |    1 
 drivers/mtd/nand/cmx270-nand.c |  271 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 276 insertions(+), 0 deletions(-)
 create mode 100644 drivers/mtd/nand/cmx270-nand.c

base a34beb5936e5819d8b2d51b153434825700463ef
last deaa2960bd8fb1f706a935cd7a87321977e6f568
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 358f55a82dbe4ebb73b1b0ee460063a6145e3f0e..c80272bcc69b6e13ab0c4403e4635a8a4076dc6c 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -247,6 +247,10 @@ config MTD_NAND_AT91
 	help
 	  Enables support for NAND Flash / Smart Media Card interface
 	  on Atmel AT91 processors.
+ 
+config MTD_NAND_CM_X270
+  	tristate "Support for NAND Flash on CompuLab CM-X270"
+  	depends on MTD_NAND && ARCH_PXA
 
 config MTD_NAND_NANDSIM
 	tristate "Support for NAND Flash Simulator"
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index f7a53f0b70177451680402a2c2cce4c98991cd6e..d5abbca6d5ae18e287af0b02075f99838d35dc85 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_MTD_NAND_NANDSIM)		+= nandsim.o
 obj-$(CONFIG_MTD_NAND_CS553X)		+= cs553x_nand.o
 obj-$(CONFIG_MTD_NAND_NDFC)		+= ndfc.o
 obj-$(CONFIG_MTD_NAND_AT91)		+= at91_nand.o
+obj-$(CONFIG_MTD_NAND_CM_X270)		+= cmx270-nand.o
 
 nand-objs := nand_base.o nand_bbt.o
 cafe_nand-objs := cafe.o cafe_ecc.o
diff --git a/drivers/mtd/nand/cmx270-nand.c b/drivers/mtd/nand/cmx270-nand.c
new file mode 100644
index 0000000000000000000000000000000000000000..1cd531e610dee846e246b4b1d56bb4119939682b
--- /dev/null
+++ b/drivers/mtd/nand/cmx270-nand.c
@@ -0,0 +1,271 @@
+/*
+ *  drivers/mtd/nand/cmx270-nand.c
+ *
+ *  Copyright (C) 2005 Compulab, Ltd. (mike@compulab.co.il)
+ *                2007 BEC Systems, LLC (cbrake@bec-systems.com)
+ *                     - updated to 2.6.20 NAND API
+ *
+ *  Derived from drivers/mtd/nand/h1910.c
+ *       Copyright (C) 2002 Marius Gr�ger (mag@sysgo.de)
+ *       Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
+ *
+ *
+ * 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
+ * published by the Free Software Foundation.
+ *
+ *  Overview:
+ *   This is a device driver for the NAND flash device found on the
+ *   CM-X270 board.
+ */
+
+#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/io.h>
+#include <asm/irq.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/pxa-regs.h>
+
+#define GPIO_NAND_CS	(11)
+#define GPIO_NAND_RB	(89)
+
+#define DRAIN_WB() \
+	do { \
+		unsigned char dummy; \
+		asm volatile ("mcr p15, 0, r0, c7, c10, 4":::"r0"); \
+		dummy=*((volatile unsigned char*)UNCACHED_ADDR); \
+	} while(0);
+
+/*
+ * MTD structure for CM-X270 board
+ */
+static struct mtd_info *cmx270_nand_mtd = NULL;
+
+/*
+ * Module stuff
+ */
+
+#ifdef CONFIG_MTD_PARTITIONS
+/*
+ * Define static partitions for flash device
+ */
+static struct mtd_partition partition_info[] = {
+	{
+		.name = "app",
+		.offset = 0,
+		.size = 64*1024*1024
+	},
+	{
+		.name = "data",
+		.offset = MTDPART_OFS_APPEND,
+		.size = MTDPART_SIZ_FULL
+	}
+};
+
+#define NUM_PARTITIONS ARRAY_SIZE(partition_info)
+
+#endif
+
+
+static 	u_char cmx270_read_byte(struct mtd_info *mtd)
+{
+	struct nand_chip *this = mtd->priv;
+	return (readl(this->IO_ADDR_R) >> 16);
+}
+
+static void cmx270_write_byte(struct mtd_info *mtd, u_char byte)
+{
+	struct nand_chip *this = mtd->priv;
+	writel((byte << 16), this->IO_ADDR_W);
+}
+
+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++ << 16), this->IO_ADDR_W);
+	}
+}
+
+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++ = readl(this->IO_ADDR_R) >> 16;
+	}
+}
+
+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] != (u_char)(readl(this->IO_ADDR_R) >> 16) )
+			return -EFAULT;
+	}
+
+	return 0;
+}
+
+static inline void nand_cs_on(void)
+{
+	GPCR(GPIO_NAND_CS) = GPIO_bit(GPIO_NAND_CS);
+}
+
+static void nand_cs_off(void)
+{
+	DRAIN_WB();
+
+	GPSR(GPIO_NAND_CS) = GPIO_bit(GPIO_NAND_CS);
+}
+
+/*
+ *	hardware specific access to control-lines
+ *
+ *	NAND_NCE: bit 0 - GPIO_NAND_CS
+ *	NAND_CLE: bit 1 - address bit 2
+ *	NAND_ALE: bit 2 - address bit 3
+ */
+static void cmx270_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+{
+	struct nand_chip* chip = mtd->priv;
+
+	DRAIN_WB();
+
+	if (ctrl & NAND_CTRL_CHANGE) {
+		if (ctrl & NAND_NCE) nand_cs_on();
+		else nand_cs_off();
+	}
+
+
+	if (cmd != NAND_CMD_NONE) {
+		writel(cmd << 16, (unsigned int)(chip->IO_ADDR_W) | ((ctrl & 0x6) << 1 ));
+	}
+
+	DRAIN_WB();
+}
+
+/*
+ *	read device ready pin
+ */
+static int cmx270_device_ready(struct mtd_info *mtd)
+{
+	DRAIN_WB();
+	return ( GPLR(GPIO_NAND_RB) & GPIO_bit(GPIO_NAND_RB) );
+}
+
+/*
+ * Main initialization routine
+ */
+static int __init cmx270_init (void)
+{
+	struct nand_chip *this;
+	const char *part_type = 0;
+	int mtd_parts_nb = 0;
+	struct mtd_partition *mtd_parts = 0;
+	static unsigned int nandaddr = 0;
+
+
+	/* Allocate memory for MTD device structure and private data */
+	cmx270_nand_mtd = kmalloc(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;
+	}
+
+	nandaddr = (volatile unsigned int)ioremap(PXA_CS1_PHYS, 100);
+
+	/* Get pointer to private data */
+	this = (struct nand_chip *) (&cmx270_nand_mtd[1]);
+
+	/* Initialize structures */
+	memset((char *) cmx270_nand_mtd, 0, sizeof(struct mtd_info));
+	memset((char *) this, 0, sizeof(struct nand_chip));
+
+	/* Link the private data with the MTD structure */
+	cmx270_nand_mtd->priv = this;
+	cmx270_nand_mtd->owner = THIS_MODULE;
+
+	/* insert callbacks */
+	this->IO_ADDR_R = (void __iomem *)nandaddr;
+	this->IO_ADDR_W = (void __iomem *)nandaddr;
+	this->cmd_ctrl = cmx270_hwcontrol;
+/* 	this->dev_ready = cmx270_device_ready;	/\* unknown whether that was correct or not so we will just do it like this *\/ */
+
+	/* 15 us command delay time */
+	this->chip_delay = 50;
+	this->ecc.mode = NAND_ECC_SOFT;
+
+	/* read/write functions */
+	this->read_byte = cmx270_read_byte;
+	//this->write_byte = cmx270_write_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 - returning -ENXIO\n");
+		iounmap((void*)nandaddr);
+		kfree (cmx270_nand_mtd);
+		return -ENXIO;
+	}
+
+//#ifdef CONFIG_MTD_CMDLINE_PARTS
+#if 0
+	mtd_parts_nb = parse_cmdline_partitions(cmx270_nand_mtd, &mtd_parts,
+						"cmx270");
+	if (mtd_parts_nb > 0)
+	  part_type = "command line";
+	else
+	  mtd_parts_nb = 0;
+#endif
+	if (mtd_parts_nb == 0)
+	{
+		mtd_parts = partition_info;
+		mtd_parts_nb = NUM_PARTITIONS;
+		part_type = "static";
+	}
+
+	/* Register the partitions */
+	printk(KERN_NOTICE "Using %s partition definition\n", part_type);
+	add_mtd_partitions(cmx270_nand_mtd, mtd_parts, mtd_parts_nb);
+
+	/* Return happy */
+	return 0;
+}
+module_init(cmx270_init);
+
+/*
+ * Clean up routine
+ */
+static void __exit cmx270_cleanup (void)
+{
+	struct nand_chip *this;
+
+	this = (struct nand_chip *) (&cmx270_nand_mtd[1]);
+	iounmap(this->IO_ADDR_R);
+
+	/* Release resources, unregister device */
+	nand_release (cmx270_nand_mtd);
+
+	/* Free the MTD device structure */
+	kfree (cmx270_nand_mtd);
+}
+module_exit(cmx270_cleanup);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mike Rapoport <mike at compulab dot co dot il>");
+MODULE_DESCRIPTION("NAND flash driver for Compulab CM-X270 Core");
-- 
1.4.4.4