path: root/recipes/linux/linux-2.6.23+2.6.24-rc5/gesbc-9302/0001-gesbc-nand.patch

From 9819226a16a12ba0545e90b475fa70d408544971 Mon Sep 17 00:00:00 2001
From: Cliff Brake <cbrake@happy.(none)>
Date: Mon, 17 Dec 2007 16:45:47 -0500
Subject: [PATCH] gesbc-nand

---
 drivers/mtd/nand/Kconfig  |    7 ++
 drivers/mtd/nand/Makefile |    1 +
 drivers/mtd/nand/gesbc.c  |  255 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 263 insertions(+), 0 deletions(-)
 create mode 100644 drivers/mtd/nand/gesbc.c

diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 246d451..cde3146 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -51,6 +51,13 @@ config MTD_NAND_EDB7312
 	  This enables the driver for the Cirrus Logic EBD7312 evaluation
 	  board to access the onboard NAND Flash.
 
+config MTD_NAND_GESBC
+	tristate "Support for Glomation GESBC-93xx board"
+	depends on MTD_NAND && MACH_EDB9302
+	help
+	  This enables the driver for the Glomation GESBC-93xx
+	  board to access the onboard NAND Flash.
+
 config MTD_NAND_H1900
 	tristate "iPAQ H1900 flash"
 	depends on ARCH_PXA && MTD_PARTITIONS
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index 3ad6c01..58c1961 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_MTD_NAND_AMS_DELTA)	+= ams-delta.o
 obj-$(CONFIG_MTD_NAND_TOTO)		+= toto.o
 obj-$(CONFIG_MTD_NAND_AUTCPU12)		+= autcpu12.o
 obj-$(CONFIG_MTD_NAND_EDB7312)		+= edb7312.o
+obj-$(CONFIG_MTD_NAND_GESBC)		+= gesbc.o
 obj-$(CONFIG_MTD_NAND_AU1550)		+= au1550nd.o
 obj-$(CONFIG_MTD_NAND_BF5XX)		+= bf5xx_nand.o
 obj-$(CONFIG_MTD_NAND_PPCHAMELEONEVB)	+= ppchameleonevb.o
diff --git a/drivers/mtd/nand/gesbc.c b/drivers/mtd/nand/gesbc.c
new file mode 100644
index 0000000..a5844b1
--- /dev/null
+++ b/drivers/mtd/nand/gesbc.c
@@ -0,0 +1,255 @@
+/*
+ *  drivers/mtd/nand/gesbc-9302.c
+ *
+ *  Copyright (C) 2004 Glomation (support@glomationinc.com)
+ *
+ *  Derived from drivers/mtd/nand/edb7312.c
+ *       Copyright (C) 2004 Marius Grer (mag@sysgo.de)
+ *
+ *  Derived from drivers/mtd/nand/autcpu12.c
+ *       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
+ *   GESBC-93xx board with Samsung 128/256/512 Mbyte part.
+ */
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+#include <asm/io.h>
+#include <asm/arch/hardware.h>
+#include <asm/sizes.h>
+
+#define GESBC_NAND_FLASH_DATA 0x10000000
+
+#define GPIO_PADR	EP93XX_GPIO_REG(0x0)
+#define GPIO_PADDR	EP93XX_GPIO_REG(0x10)
+#define SMCBCR1		(EP93XX_AHB_VIRT_BASE + 0x00082000 + 0x04)
+
+/*
+ * MTD structure for GESBC-93xx board
+ */
+static struct mtd_info *gesbc_mtd = NULL;
+
+
+/*
+ * Module stuff
+ */
+static unsigned long gesbc_fio_pbase = GESBC_NAND_FLASH_DATA;
+
+#ifdef CONFIG_MTD_PARTITIONS
+/*
+ * Define static partitions for flash device
+ */
+static struct mtd_partition partition_info32[] = {
+	{ .name= "GESBC NAND FLASH",
+		  .offset= 0,
+		  .size= 128*1024*1024 },
+};
+/*
+ * Define static partitions for flash device
+ */
+static struct mtd_partition partition_info128[] = {
+	{ .name= "GESBC NAND FLASH",
+		  .offset= 0,
+		  .size= 128*1024*1024 },
+};
+
+/*
+ * Define static partitions for flash device
+ */
+static struct mtd_partition partition_info256[] = {
+	{ .name= "GESBC NAND FLASH",
+		  .offset= 0,
+		  .size= 256*1024*1024 },
+};
+
+/*
+ * Define static partitions for flash device
+ */
+static struct mtd_partition partition_info512[] = {
+	{ .name= "GESBC NAND FLASH",
+		  .offset= 0,
+		  .size= 512*1024*1024 },
+};
+
+#define NUM_PARTITIONS 1
+#endif
+
+
+/* 
+ *	hardware specific access to control-lines
+ *      NAND_NCE: bit 0 -> bit 3
+ *      NAND_CLE: bit 1 -> bit 4
+ *      NAND_ALE: bit 2 -> bit 6
+ */
+static void gesbc_hwcontrol(struct mtd_info *mtd, int cmd, int ctrl) 
+{
+	unsigned long flags;
+        struct nand_chip *chip = mtd->priv;
+
+	/* Disbale interrupt to avoid race condition */
+	local_irq_save(flags);
+
+        if (ctrl & NAND_CTRL_CHANGE) {
+                unsigned char bits;
+
+                bits = (ctrl & NAND_CLE) << 3;
+                bits |= (ctrl & NAND_ALE) << 4;
+		if (ctrl & NAND_NCE)
+			bits &= ~0x08;
+		else
+			bits |= 0x08;
+
+		__raw_writel( (__raw_readl(GPIO_PADR) & ~0x58 )| bits, GPIO_PADR);
+        }
+        if (cmd != NAND_CMD_NONE)
+                writeb(cmd, chip->IO_ADDR_W);
+	/* Restore interrupt state */
+	local_irq_restore(flags);
+}
+
+/*
+ *	read device ready pin
+ */
+static int gesbc_device_ready(struct mtd_info *mtd)
+{
+	return  (__raw_readl(GPIO_PADR) & 0x80) >> 7;
+}
+
+#define MTDID      "s3c2440-nand"
+
+static const char *probes[] = { "cmdlinepart", NULL };
+
+
+
+/*
+ * Main initialization routine
+ */
+static int __init gesbc_nand_init (void)
+{
+	struct nand_chip *this;
+	const char *part_type = 0;
+	int mtd_parts_nb = 0;
+	struct mtd_partition *mtd_parts = 0;
+	unsigned long flags;
+	void * gesbc_fio_base;
+
+	/* Allocate memory for MTD device structure and private data */
+	gesbc_mtd = kmalloc(sizeof(struct mtd_info) + 
+			     sizeof(struct nand_chip),
+			     GFP_KERNEL);
+	if (!gesbc_mtd) {
+		printk("Unable to allocate GESBC NAND MTD device structure.\n");
+		return -ENOMEM;
+	}
+
+	/* map physical adress */
+	gesbc_fio_base = ioremap(gesbc_fio_pbase, SZ_1K);
+	if(!gesbc_fio_base) {
+		printk("ioremap GESBC-93xx NAND flash failed\n");
+		kfree(gesbc_mtd);
+		return -EIO;
+	}
+
+	
+	/* Get pointer to private data */
+	this = (struct nand_chip *) (&gesbc_mtd[1]);
+	
+	/* Initialize structures */
+	memset((char *) gesbc_mtd, 0, sizeof(struct mtd_info));
+	memset((char *) this, 0, sizeof(struct nand_chip));
+
+	/* Link the private data with the MTD structure */
+	gesbc_mtd->priv = this;
+
+	/* Disbale interrupt to avoid race condition */
+	local_irq_save(flags);
+
+	/*
+	 * Set GPIO Port A control register so that the pins are configured
+	 * to be outputs for controlling the NAND flash.
+	 */
+	__raw_writel((__raw_readl(GPIO_PADDR) | 0x58) & ~0x80, GPIO_PADDR);
+	/* Clear NCE, clear CLE, clear ALE */
+	__raw_writel( (__raw_readl(GPIO_PADR) | 0x08 ) & ~0x50, GPIO_PADR);
+	/* Set SRAM controller to 32 bit (8 bit just doesn't work, don't know why) bus width and 7 CLK wait state */
+	__raw_writel(0x10003ce0, SMCBCR1);
+	local_irq_restore(flags);
+
+	
+	/* insert callbacks */
+	this->IO_ADDR_R = (void *) gesbc_fio_base;
+	this->IO_ADDR_W = (void *) gesbc_fio_base;
+	this->cmd_ctrl = (void *) gesbc_hwcontrol;
+	this->dev_ready = gesbc_device_ready;
+	this->chip_delay = 25;
+	this->ecc.mode = NAND_ECC_SOFT;
+	
+	__raw_writel(0xffffffff, gesbc_fio_base);
+	printk("Searching for NAND flash...\n");
+	/* Scan to find existence of the device */
+	if (nand_scan (gesbc_mtd, 1)) {
+		iounmap((void *)gesbc_fio_base);
+		kfree (gesbc_mtd);
+		return -ENXIO;
+	}
+
+#ifdef CONFIG_MTD_CMDLINE_PARTS
+        gesbc_mtd->name="GESBC-NAND";
+        mtd_parts_nb = parse_mtd_partitions(gesbc_mtd,  probes, &mtd_parts, 0);
+        if (mtd_parts_nb > 0)
+                part_type = "command line";
+        else
+                mtd_parts_nb = 0;
+#endif
+
+	if (mtd_parts_nb == 0)
+	{
+		mtd_parts_nb = NUM_PARTITIONS;
+		mtd_parts = partition_info32;
+		if (gesbc_mtd->size >= (128 * 0x100000))
+			mtd_parts = partition_info128;
+		if (gesbc_mtd->size >= (256 * 0x100000))
+			mtd_parts = partition_info256;
+		if (gesbc_mtd->size >= (512 * 0x100000))
+			mtd_parts = partition_info512;
+		part_type = "static";
+	}
+	
+	/* Register the partitions */
+	printk(KERN_NOTICE "Using %s partition definition\n", part_type);
+	add_mtd_partitions(gesbc_mtd, mtd_parts, mtd_parts_nb);
+	
+	/* Return happy */
+	return 0;
+}
+module_init(gesbc_nand_init);
+
+/*
+ * Clean up routine
+ */
+static void __exit gesbc_nand_cleanup (void)
+{
+/*	struct nand_chip *this = (struct nand_chip *) &gesbc_mtd[1]; */
+	
+	/* Unregister the device */
+	del_mtd_device (gesbc_mtd);
+	
+	/* Free the MTD device structure */
+	kfree (gesbc_mtd);
+}
+module_exit(gesbc_nand_cleanup);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("zql@glomationinc.com");
+MODULE_DESCRIPTION("MTD map driver for Glomation GESBC-93xx board");
+
-- 
1.5.2.5