[PATCH,RFC] ts72xx NAND driver
Lennert Buytenhek
buytenh at wantstofly.org
Thu Mar 2 08:12:03 EST 2006
Hello,
The attached patch, originally written by Jesse Off of Technologic
Systems, implements support for the NAND flash on the Technologic
Systems TS-7250 series of cirrus ep93xx boards.
Support for the ep93xx isn't upstream yet, but I'm trying to get it
merged for 2.6.17, so it would be nice if this could go into 2.6.17
as well.
Any feedback appreciated..
cheers,
Lennert
diff -urN linux-2.6.15.orig/drivers/mtd/nand/Kconfig linux-2.6.15/drivers/mtd/nand/Kconfig
--- linux-2.6.15.orig/drivers/mtd/nand/Kconfig 2006-02-12 10:22:16.000000000 +0100
+++ linux-2.6.15/drivers/mtd/nand/Kconfig 2006-02-20 21:20:41.000000000 +0100
@@ -55,6 +55,12 @@
help
Support for NAND flash on Texas Instruments Toto platform.
+config MTD_NAND_TS7250
+ tristate "NAND Flash device on TS-7250 board"
+ depends on MACH_TS72XX && MTD_NAND
+ help
+ Support for NAND flash on Technologic Systems TS-7250 platform.
+
config MTD_NAND_IDS
tristate
diff -urN linux-2.6.15.orig/drivers/mtd/nand/Makefile linux-2.6.15/drivers/mtd/nand/Makefile
--- linux-2.6.15.orig/drivers/mtd/nand/Makefile 2006-02-12 10:22:16.000000000 +0100
+++ linux-2.6.15/drivers/mtd/nand/Makefile 2006-02-20 21:19:38.000000000 +0100
@@ -17,6 +17,7 @@
obj-$(CONFIG_MTD_NAND_H1900) += h1910.o
obj-$(CONFIG_MTD_NAND_RTC_FROM4) += rtc_from4.o
obj-$(CONFIG_MTD_NAND_SHARPSL) += sharpsl.o
+obj-$(CONFIG_MTD_NAND_TS7250) += ts7250.o
obj-$(CONFIG_MTD_NAND_NANDSIM) += nandsim.o
nand-objs = nand_base.o nand_bbt.o
diff -urN linux-2.6.15.orig/drivers/mtd/nand/ts7250.c linux-2.6.15/drivers/mtd/nand/ts7250.c
--- linux-2.6.15.orig/drivers/mtd/nand/ts7250.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.15/drivers/mtd/nand/ts7250.c 2006-03-02 14:00:23.000000000 +0100
@@ -0,0 +1,208 @@
+/*
+ * drivers/mtd/nand/ts7250.c
+ *
+ * Copyright (C) 2004 Technologic Systems (support at embeddedARM.com)
+ *
+ * Derived from drivers/mtd/nand/edb7312.c
+ * Copyright (C) 2004 Marius Gröger (mag at sysgo.de)
+ *
+ * Derived from drivers/mtd/nand/autcpu12.c
+ * Copyright (c) 2001 Thomas Gleixner (gleixner at autronix.de)
+ *
+ * $Id: ts7250.c,v 1.4 2004/12/30 22:02:07 joff 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
+ * published by the Free Software Foundation.
+ *
+ * Overview:
+ * This is a device driver for the NAND flash device found on the
+ * TS-7250 board which utilizes a Samsung 32 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>
+#include <asm/mach-types.h>
+
+/*
+ * MTD structure for TS7250 board
+ */
+static struct mtd_info *ts7250_mtd = NULL;
+
+#ifdef CONFIG_MTD_PARTITIONS
+/*
+ * Define static partitions for flash device
+ */
+static struct mtd_partition partition_info32[] = {
+ {
+ .name = "TS-BOOTROM",
+ .offset = 0x00000000,
+ .size = 0x00004000,
+ }, {
+ .name = "Linux",
+ .offset = 0x00004000,
+ .size = 0x01d00000,
+ }, {
+ .name = "RedBoot",
+ .offset = 0x01d04000,
+ .size = 0x002fc000,
+ },
+};
+
+/*
+ * Define static partitions for flash device
+ */
+static struct mtd_partition partition_info128[] = {
+ {
+ .name = "TS-BOOTROM",
+ .offset = 0x00000000,
+ .size = 0x00004000,
+ }, {
+ .name = "Linux",
+ .offset = 0x00004000,
+ .size = 0x07d00000,
+ }, {
+ .name = "RedBoot",
+ .offset = 0x07d04000,
+ .size = 0x002fc000,
+ },
+};
+
+#define NUM_PARTITIONS 3
+
+extern int parse_cmdline_partitions(struct mtd_info *master,
+ struct mtd_partition **pparts, const char *mtd_id);
+#endif
+
+
+/*
+ * hardware specific access to control-lines
+ */
+static void ts7250_hwcontrol(struct mtd_info *mtd, int cmd)
+{
+ unsigned long ctrl = TS72XX_NAND_CONTROL_VIRT_BASE;
+
+ switch(cmd) {
+ case NAND_CTL_SETCLE:
+ __raw_writeb(__raw_readb(ctrl) | 0x2, ctrl);
+ break;
+ case NAND_CTL_CLRCLE:
+ __raw_writeb(__raw_readb(ctrl) & ~0x2, ctrl);
+ break;
+ case NAND_CTL_SETALE:
+ __raw_writeb(__raw_readb(ctrl) | 0x1, ctrl);
+ break;
+ case NAND_CTL_CLRALE:
+ __raw_writeb(__raw_readb(ctrl) & ~0x1, ctrl);
+ break;
+ case NAND_CTL_SETNCE:
+ __raw_writeb(__raw_readb(ctrl) | 0x4, ctrl);
+ break;
+ case NAND_CTL_CLRNCE:
+ __raw_writeb(__raw_readb(ctrl) & ~0x4, ctrl);
+ break;
+ }
+}
+
+/*
+ * read device ready pin
+ */
+static int ts7250_device_ready(struct mtd_info *mtd)
+{
+ return __raw_readb(TS72XX_NAND_BUSY_VIRT_BASE) & 0x20;
+}
+
+/*
+ * Main initialization routine
+ */
+static int __init ts7250_init (void)
+{
+ struct nand_chip *this;
+ const char *part_type = 0;
+ int mtd_parts_nb = 0;
+ struct mtd_partition *mtd_parts = 0;
+
+ if (!machine_is_ts72xx() || board_is_ts7200())
+ return -ENXIO;
+
+ /* Allocate memory for MTD device structure and private data */
+ ts7250_mtd = kmalloc(sizeof(struct mtd_info) +
+ sizeof(struct nand_chip), GFP_KERNEL);
+ if (!ts7250_mtd) {
+ printk("Unable to allocate TS7250 NAND MTD device structure.\n");
+ return -ENOMEM;
+ }
+
+ /* Get pointer to private data */
+ this = (struct nand_chip *) (&ts7250_mtd[1]);
+
+ /* Initialize structures */
+ memset(ts7250_mtd, 0, sizeof(struct mtd_info));
+ memset(this, 0, sizeof(struct nand_chip));
+
+ /* Link the private data with the MTD structure */
+ ts7250_mtd->priv = this;
+
+ /* insert callbacks */
+ this->IO_ADDR_R = (void *)TS72XX_NAND_DATA_VIRT_BASE;
+ this->IO_ADDR_W = (void *)TS72XX_NAND_DATA_VIRT_BASE;
+ this->hwcontrol = ts7250_hwcontrol;
+ this->dev_ready = ts7250_device_ready;
+ this->chip_delay = 15;
+ this->eccmode = NAND_ECC_SOFT;
+
+ printk("Searching for NAND flash...\n");
+ /* Scan to find existence of the device */
+ if (nand_scan (ts7250_mtd, 1)) {
+ kfree (ts7250_mtd);
+ return -ENXIO;
+ }
+
+#ifdef CONFIG_MTD_CMDLINE_PARTS
+ mtd_parts_nb = parse_cmdline_partitions(ts7250_mtd, &mtd_parts,
+ "ts7250-nand");
+ if (mtd_parts_nb > 0)
+ part_type = "command line";
+ else
+ mtd_parts_nb = 0;
+#endif
+ if (mtd_parts_nb == 0) {
+ mtd_parts = partition_info32;
+ if (ts7250_mtd->size >= (128 * 0x100000))
+ mtd_parts = partition_info128;
+ mtd_parts_nb = NUM_PARTITIONS;
+ part_type = "static";
+ }
+
+ /* Register the partitions */
+ printk(KERN_NOTICE "Using %s partition definition\n", part_type);
+ add_mtd_partitions(ts7250_mtd, mtd_parts, mtd_parts_nb);
+
+ /* Return happy */
+ return 0;
+}
+module_init(ts7250_init);
+
+/*
+ * Clean up routine
+ */
+static void __exit ts7250_cleanup (void)
+{
+ /* Unregister the device */
+ del_mtd_device (ts7250_mtd);
+
+ /* Free the MTD device structure */
+ kfree (ts7250_mtd);
+}
+module_exit(ts7250_cleanup);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jesse Off <joff at embeddedARM.com>");
+MODULE_DESCRIPTION("MTD map driver for Technologic Systems TS-7250 board");
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