Initial import

1 files changed, 250 insertions, 0 deletions

diff --git a/drivers/mtd/nand/cmx270_nand.c b/drivers/mtd/nand/cmx270_nand.c
new file mode 100644
index 000000000..66ec95e6c
--- /dev/null
+++ b/drivers/mtd/nand/cmx270_nand.c
@@ -0,0 +1,250 @@
+/*
+ *  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)
+ *
+ *
+ * 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/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/module.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/mach-types.h>
+
+#include <mach/pxa2xx-regs.h>
+
+#define GPIO_NAND_CS	(11)
+#define GPIO_NAND_RB	(89)
+
+/* 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[] = {
+	[0] = {
+		.name	= "cmx270-0",
+		.offset	= 0,
+		.size	= MTDPART_SIZ_FULL
+	}
+};
+#define NUM_PARTITIONS (ARRAY_SIZE(partition_info))
+
+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_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 inline void nand_cs_on(void)
+{
+	gpio_set_value(GPIO_NAND_CS, 0);
+}
+
+static void nand_cs_off(void)
+{
+	dsb();
+
+	gpio_set_value(GPIO_NAND_CS, 1);
+}
+
+/*
+ *	hardware specific access to control-lines
+ */
+static void cmx270_hwcontrol(struct mtd_info *mtd, int dat,
+			     unsigned int ctrl)
+{
+	struct nand_chip* this = mtd->priv;
+	unsigned int nandaddr = (unsigned int)this->IO_ADDR_W;
+
+	dsb();
+
+	if (ctrl & NAND_CTRL_CHANGE) {
+		if ( ctrl & NAND_ALE )
+			nandaddr |=  (1 << 3);
+		else
+			nandaddr &= ~(1 << 3);
+		if ( ctrl & NAND_CLE )
+			nandaddr |=  (1 << 2);
+		else
+			nandaddr &= ~(1 << 2);
+		if ( ctrl & NAND_NCE )
+			nand_cs_on();
+		else
+			nand_cs_off();
+	}
+
+	dsb();
+	this->IO_ADDR_W = (void __iomem*)nandaddr;
+	if (dat != NAND_CMD_NONE)
+		writel((dat << 16), this->IO_ADDR_W);
+
+	dsb();
+}
+
+/*
+ *	read device ready pin
+ */
+static int cmx270_device_ready(struct mtd_info *mtd)
+{
+	dsb();
+
+	return (gpio_get_value(GPIO_NAND_RB));
+}
+
+/*
+ * Main initialization routine
+ */
+static int __init cmx270_init(void)
+{
+	struct nand_chip *this;
+	int ret;
+
+	if (!(machine_is_armcore() && cpu_is_pxa27x()))
+		return -ENODEV;
+
+	ret = gpio_request(GPIO_NAND_CS, "NAND CS");
+	if (ret) {
+		pr_warning("CM-X270: failed to request NAND CS gpio\n");
+		return ret;
+	}
+
+	gpio_direction_output(GPIO_NAND_CS, 1);
+
+	ret = gpio_request(GPIO_NAND_RB, "NAND R/B");
+	if (ret) {
+		pr_warning("CM-X270: failed to request NAND R/B gpio\n");
+		goto err_gpio_request;
+	}
+
+	gpio_direction_input(GPIO_NAND_RB);
+
+	/* Allocate memory for MTD device structure and private data */
+	cmx270_nand_mtd = kzalloc(sizeof(struct mtd_info) +
+				  sizeof(struct nand_chip),
+				  GFP_KERNEL);
+	if (!cmx270_nand_mtd) {
+		ret = -ENOMEM;
+		goto err_kzalloc;
+	}
+
+	cmx270_nand_io = ioremap(PXA_CS1_PHYS, 12);
+	if (!cmx270_nand_io) {
+		pr_debug("Unable to ioremap NAND device\n");
+		ret = -EINVAL;
+		goto err_ioremap;
+	}
+
+	/* Get pointer to private data */
+	this = (struct nand_chip *)(&cmx270_nand_mtd[1]);
+
+	/* Link the private data with the MTD structure */
+	cmx270_nand_mtd->owner = THIS_MODULE;
+	cmx270_nand_mtd->priv = this;
+
+	/* insert callbacks */
+	this->IO_ADDR_R = cmx270_nand_io;
+	this->IO_ADDR_W = cmx270_nand_io;
+	this->cmd_ctrl = cmx270_hwcontrol;
+	this->dev_ready = cmx270_device_ready;
+
+	/* 15 us command delay time */
+	this->chip_delay = 20;
+	this->ecc.mode = NAND_ECC_SOFT;
+
+	/* read/write functions */
+	this->read_byte = cmx270_read_byte;
+	this->read_buf = cmx270_read_buf;
+	this->write_buf = cmx270_write_buf;
+
+	/* Scan to find existence of the device */
+	if (nand_scan (cmx270_nand_mtd, 1)) {
+		pr_notice("No NAND device\n");
+		ret = -ENXIO;
+		goto err_scan;
+	}
+
+	/* Register the partitions */
+	ret = mtd_device_parse_register(cmx270_nand_mtd, NULL, NULL,
+					partition_info, NUM_PARTITIONS);
+	if (ret)
+		goto err_scan;
+
+	/* Return happy */
+	return 0;
+
+err_scan:
+	iounmap(cmx270_nand_io);
+err_ioremap:
+	kfree(cmx270_nand_mtd);
+err_kzalloc:
+	gpio_free(GPIO_NAND_RB);
+err_gpio_request:
+	gpio_free(GPIO_NAND_CS);
+
+	return ret;
+
+}
+module_init(cmx270_init);
+
+/*
+ * Clean up routine
+ */
+static void __exit cmx270_cleanup(void)
+{
+	/* Release resources, unregister device */
+	nand_release(cmx270_nand_mtd);
+
+	gpio_free(GPIO_NAND_RB);
+	gpio_free(GPIO_NAND_CS);
+
+	iounmap(cmx270_nand_io);
+
+	/* Free the MTD device structure */
+	kfree (cmx270_nand_mtd);
+}
+module_exit(cmx270_cleanup);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
+MODULE_DESCRIPTION("NAND flash driver for Compulab CM-X270 Module");