[PATCH,RFC] ts81xx NAND driver
Eddie Dawydiuk
eddie at embeddedarm.com
Fri Mar 6 12:29:17 EST 2009
Hello,
The attached patch implements support for the NAND flash on the
Technologic Systems TS-8150 series of AMCC 44x boards.
Any feedback appreciated..
diff -urN linux-2.6.28.orig/drivers/mtd/nand/Kconfig
linux-2.6.28/drivers/mtd/nand/Kconfig
--- linux-2.6.28.orig/drivers/mtd/nand/Kconfig 2008-12-24
16:26:37.000000000 -0700
+++ linux-2.6.28/drivers/mtd/nand/Kconfig 2009-03-06
10:21:57.000000000 -0700
@@ -420,4 +420,10 @@
Several Renesas SuperH CPU has FLCTL. This option enables support
for NAND Flash using FLCTL. This driver support SH7723.
+config MTD_NAND_TS8150
+ tristate "NAND Flash device on TS-8150 board"
+ depends on MTD_NAND && TS81XX
+ help
+ Support for NAND flash on Technologic Systems TS-8150 platform.
+
endif # MTD_NAND
diff -urN linux-2.6.28.orig/drivers/mtd/nand/Kconfig
linux-2.6.28/drivers/mtd/nand/Kconfig
--- linux-2.6.28.orig/drivers/mtd/nand/Kconfig 2008-12-24
16:26:37.000000000 -0700
+++ linux-2.6.28/drivers/mtd/nand/Kconfig 2009-03-06
10:21:57.000000000 -0700
@@ -420,4 +420,10 @@
Several Renesas SuperH CPU has FLCTL. This option enables support
for NAND Flash using FLCTL. This driver support SH7723.
+config MTD_NAND_TS8150
+ tristate "NAND Flash device on TS-8150 board"
+ depends on MTD_NAND && TS81XX
+ help
+ Support for NAND flash on Technologic Systems TS-8150 platform.
+
endif # MTD_NAND
eddie at io:kernels$ diff -urN linux-2.6.28.orig/drivers/mtd/nand/Makefile
linux-2.6.28/drivers/mtd/nand/Makefile
--- linux-2.6.28.orig/drivers/mtd/nand/Makefile 2008-12-24
16:26:37.000000000 -0700
+++ linux-2.6.28/drivers/mtd/nand/Makefile 2009-03-05
17:37:01.000000000 -0700
@@ -36,5 +36,6 @@
obj-$(CONFIG_MTD_NAND_FSL_UPM) += fsl_upm.o
obj-$(CONFIG_MTD_NAND_SH_FLCTL) += sh_flctl.o
obj-$(CONFIG_MTD_NAND_MXC) += mxc_nand.o
+obj-$(CONFIG_MTD_NAND_TS8150) += ts8150.o
nand-objs := nand_base.o nand_bbt.o
diff -urN linux-2.6.28.orig/drivers/mtd/nand/ts8150.c
linux-2.6.28/drivers/mtd/nand/ts8150.c
--- linux-2.6.28.orig/drivers/mtd/nand/ts8150.c 1969-12-31
17:00:00.000000000 -0700
+++ linux-2.6.28/drivers/mtd/nand/ts8150.c 2009-03-06
10:33:19.000000000 -0700
@@ -0,0 +1,241 @@
+/*
+ * drivers/mtd/nand/8150.c
+ *
+ * Copyright (C) 2009 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)
+ *
+ *
+ * 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-81xx boards which utilizes a 512Mbyte part
+ */
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+#include <asm/io.h>
+#include <asm/cacheflush.h>
+
+struct partition_info { // little-endian format
+ unsigned int bootable:8; // 0x80 = active, 0x00 = don't
use for booting
+ unsigned int starting_head:8;
+ unsigned int starting_csect:8;
+ unsigned int starting_xcyl:8;
+ // MSB bits 0-5 are sector
+ unsigned int system_id:8; // format of partition
+ unsigned int ending_head:8;
+ unsigned int ending_csect:8;
+ unsigned int ending_xcyl:8;
+ unsigned int relative_sector:32; // sector offset from
start of disk to start of volume
+ unsigned int total_sectors:32;
+} __attribute__ ((packed));
+
+struct partition_table {
+ struct partition_info part[4];
+} __attribute__ ((__packed__));
+
+struct MBR {
+ char bootcode[446];
+ struct partition_table pt;
+ unsigned int sig55:8;
+ unsigned int sigAA:8;
+} __attribute__ ((__packed__));
+
+/*
+ * MTD structure for TS8150 board
+ */
+static struct mtd_info *ts8150_mtd = NULL;
+
+/*
+ * Module stuff
+ */
+
+static unsigned int ts8150_nandctrl = 0;
+static unsigned int ts8150_nanddat = 0;
+
+#ifdef CONFIG_MTD_PARTITIONS
+static struct mtd_partition partition_mbr[] = {
+ {.name = "whole chip",
+ .offset = 0,
+ .size = (0x20000000)},
+ {.name = "kernel",
+ .offset = 0x20000,
+ .size = 0x400000},
+ {.name = "initrd",
+ .offset = 0x420000,
+ .size = 0x400000},
+ {.name = "rootfs",
+ .offset = 0x820000,
+ .size = (0x20000000) - 0x820000},
+ {.name = "part4",
+ .offset = (0x20000000),
+ .size = 0},
+};
+#endif
+
+/*
+ * hardware specific access to control-lines
+ *
+ * ctrl:
+ * NAND_NCE: bit 0 -> bit 2
+ * NAND_CLE: bit 1 -> bit 1
+ * NAND_ALE: bit 2 -> bit 0
+ */
+static void ts8150_hwcontrol(struct mtd_info *mtd, int cmd, unsigned
int ctrl)
+{
+ struct nand_chip *chip = mtd->priv;
+
+ if (ctrl & NAND_CTRL_CHANGE) {
+ unsigned long addr = ts8150_nandctrl;
+ unsigned char bits;
+
+ bits = (ctrl & NAND_NCE) << 2;
+ bits |= ctrl & NAND_CLE;
+ bits |= (ctrl & NAND_ALE) >> 2;
+
+ __raw_writeb((__raw_readb((unsigned long *)addr) & ~0x7)
| bits,
+ (unsigned long *)addr);
+ }
+
+ if (cmd != NAND_CMD_NONE)
+ writeb(cmd, chip->IO_ADDR_W);
+}
+
+/*
+ * read device ready pin
+ */
+static int ts8150_device_ready(struct mtd_info *mtd)
+{
+ return __raw_readb((unsigned long *)ts8150_nandctrl) & 0x20;
+}
+
+/*
+ * Main initialization routine
+ */
+static int __init ts8150_init(void)
+{
+ struct nand_chip *this;
+ const char *part_type = 0;
+ char *nandaddr;
+ char buf[2048];
+ int i, got = 0, parts = 0;
+ unsigned ofs = 0;
+ struct MBR *mbr = (struct MBR *)buf;
+
+ /* Allocate memory for MTD device structure and private data */
+ ts8150_mtd = kmalloc(sizeof(struct mtd_info) +
+ sizeof(struct nand_chip), GFP_KERNEL);
+ if (!ts8150_mtd) {
+ printk
+ ("Unable to allocate TS8150 NAND MTD device
structure.\n");
+ return -ENOMEM;
+ }
+
+ nandaddr = ioremap(0xA4081000, 0x1000);
+
+ /* Get pointer to private data */
+ this = (struct nand_chip *)(&ts8150_mtd[1]);
+
+ /* Initialize structures */
+ memset((char *)ts8150_mtd, 0, sizeof(struct mtd_info));
+ memset((char *)this, 0, sizeof(struct nand_chip));
+
+ /* Link the private data with the MTD structure */
+ ts8150_mtd->priv = this;
+ ts8150_mtd->owner = THIS_MODULE;
+
+ /* insert callbacks */
+ this->IO_ADDR_R = nandaddr + 0x804;
+ this->IO_ADDR_W = nandaddr + 0x804;
+ ts8150_nanddat = (unsigned int)nandaddr + 0x804;
+ ts8150_nandctrl = (unsigned int)nandaddr + 0x800;
+
+ this->cmd_ctrl = ts8150_hwcontrol;
+ this->dev_ready = ts8150_device_ready;
+ this->ecc.mode = NAND_ECC_SOFT;
+
+ this->chip_delay = 15;
+ this->options = NAND_USE_FLASH_BBT;
+ this->ecc.size = 2048;
+ this->ecc.bytes = 24;
+
+ printk("Searching for NAND flash...\n");
+ /* Scan to find existence of the device */
+ if (nand_scan(ts8150_mtd, 1)) {
+ kfree(ts8150_mtd);
+ return -ENXIO;
+ }
+ for (i = 0; i < 512; i++) {
+ buf[i] = 0;
+ }
+ ts8150_mtd->read(ts8150_mtd, 0, 512, &got, buf);
+
+ if (mbr->sigAA == 0xAA && mbr->sig55 == 0x55) {
+ part_type = "MBR";
+ for (i = 0; i < 4; i++) {
+ if (mbr->pt.part[i].total_sectors) {
+ parts++;
+ partition_mbr[i + 1].offset =
+ 512 * mbr->pt.part[i].relative_sector;
+ if (i < 2) {
+ partition_mbr[i + 1].size =
+ 512 * mbr->pt.part[i +
+ 1].
+ relative_sector -
+ 512 *
+ mbr->pt.part[i].relative_sector;
+ } else {
+ partition_mbr[i + 1].size =
+ 512 *
mbr->pt.part[i].total_sectors;
+ }
+ ofs = partition_mbr[i + 1].offset
+ + partition_mbr[i + 1].size;
+ }
+ }
+ } else {
+ part_type = "default";
+ parts = 3;
+ }
+
+ /* Register the partitions */
+ printk(KERN_NOTICE "Using %s partition definition\n", part_type);
+ add_mtd_partitions(ts8150_mtd, partition_mbr, parts + 1);
+
+ /* Return happy */
+ return 0;
+}
+
+module_init(ts8150_init);
+
+/*
+ * Clean up routine
+ */
+static void __exit ts8150_cleanup(void)
+{
+ /* Unregister the device */
+ del_mtd_device(ts8150_mtd);
+
+ iounmap((void *)ts8150_nandctrl);
+
+ /* Free the MTD device structure */
+ kfree(ts8150_mtd);
+}
+
+module_exit(ts8150_cleanup);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Eddie Dawydiuk <eddie at embeddedARM.com>");
+MODULE_DESCRIPTION("MTD driver for Technologic Systems TS-8150 board");
--
Best Regards,
________________________________________________________________
Eddie Dawydiuk, Technologic Systems | voice: (480) 837-5200
16525 East Laser Drive | fax: (480) 837-5300
Fountain Hills, AZ 85268 | web: www.embeddedARM.com
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