Add map driver for epxa10db platform
Clive Davies
cdavies at altera.com
Fri Nov 23 05:23:51 EST 2001
Attached is a patch to add an mtd map driver for the Altera epxa10
development board. Any objections/comments?
TIA
Clive
diff -purN linux_2.4.13/drivers/mtd/maps/Config.in
linux/drivers/mtd/maps/Config.in
--- linux_2.4.13/drivers/mtd/maps/Config.in Mon Oct 29 15:47:07 2001
+++ linux/drivers/mtd/maps/Config.in Wed Oct 24 10:17:47 2001
@@ -57,6 +57,7 @@ if [ "$CONFIG_ARM" = "y" ]; then
dep_tristate ' CFI Flash device mapped on StrongARM SA11x0'
CONFIG_MTD_SA1100 $CONFIG_MTD_CFI $CONFIG_ARCH_SA1100 $CONFIG_MTD_PARTITIONS
dep_tristate ' CFI Flash device mapped on DC21285 Footbridge'
CONFIG_MTD_DC21285 $CONFIG_MTD_CFI $CONFIG_ARCH_FOOTBRIDGE
$CONFIG_MTD_PARTITIONS
dep_tristate ' CFI Flash device mapped on the XScale IQ80310 board'
CONFIG_MTD_IQ80310 $CONFIG_MTD_CFI $CONFIG_ARCH_IQ80310
+ dep_tristate ' CFI Flash device mapped on Epxa10db' CONFIG_MTD_EPXA10DB
$CONFIG_MTD_CFI $CONFIG_MTD_PARTITIONS
fi
# This needs CFI or JEDEC, depending on the cards found.
diff -purN linux_2.4.13/drivers/mtd/maps/epxa10db-flash.c
linux/drivers/mtd/maps/epxa10db-flash.c
--- linux_2.4.13/drivers/mtd/maps/epxa10db-flash.c Thu Jan 1 01:00:00 1970
+++ linux/drivers/mtd/maps/epxa10db-flash.c Thu Nov 1 15:13:11 2001
@@ -0,0 +1,218 @@
+/*
+ * Flash memory access on EPXA based devices
+ *
+ * (C) 2000 Nicolas Pitre <nico at cam.org>
+ * Copyright (C) 2001 Altera Corporation
+ *
+ * $Id$ */
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/hardware.h>
+
+
+MODULE_AUTHOR("Clive Davies");
+MODULE_DESCRIPTION("Altera epxa10db mtd flash map");
+MODULE_LICENSE("GPL");
+
+static __u8 epxa10db_read8(struct map_info *map, unsigned long ofs)
+{
+ return *(__u8 *)(FLASH_VADDR(EXC_EBI_BLOCK0_BASE + ofs));
+}
+
+static __u16 epxa10db_read16(struct map_info *map, unsigned long ofs)
+{
+ return *(__u16 *)(FLASH_VADDR(EXC_EBI_BLOCK0_BASE + ofs));
+}
+
+static __u32 epxa10db_read32(struct map_info *map, unsigned long ofs)
+{
+ return *(__u32 *)(FLASH_VADDR(EXC_EBI_BLOCK0_BASE + ofs));
+}
+
+static void epxa10db_copy_from(struct map_info *map, void *to, unsigned long
from, ssize_t len)
+{
+ memcpy(to, (void *)(FLASH_VADDR(EXC_EBI_BLOCK0_BASE + from)), len);
+}
+
+static void epxa10db_write8(struct map_info *map, __u8 d, unsigned long adr)
+{
+ *(__u8 *)(FLASH_VADDR(EXC_EBI_BLOCK0_BASE + adr)) = d;
+}
+
+static void epxa10db_write16(struct map_info *map, __u16 d, unsigned long
adr)
+{
+ *(__u16 *)(FLASH_VADDR(EXC_EBI_BLOCK0_BASE + adr)) = d;
+}
+
+static void epxa10db_write32(struct map_info *map, __u32 d, unsigned long
adr)
+{
+ *(__u32 *)(FLASH_VADDR(EXC_EBI_BLOCK0_BASE + adr)) = d;
+}
+
+static void epxa10db_copy_to(struct map_info *map, unsigned long to, const
void *from, ssize_t len)
+{
+ memcpy((void *)FLASH_VADDR(EXC_EBI_BLOCK0_BASE + to), from, len);
+}
+
+
+
+static struct map_info epxa10db_map = {
+ name: "EPXA10DB flash",
+ read8: epxa10db_read8,
+ read16: epxa10db_read16,
+ read32: epxa10db_read32,
+ copy_from: epxa10db_copy_from,
+ write8: epxa10db_write8,
+ write16: epxa10db_write16,
+ write32: epxa10db_write32,
+ copy_to: epxa10db_copy_to
+};
+
+
+
+
+
+int fixup_epxa10db_partitions(struct mtd_info *master, struct mtd_partition
**pparts);
+
+static struct mtd_partition *parsed_parts;
+static struct mtd_info *mymtd;
+
+int __init epxa10db_mtd_init(void)
+{
+ struct mtd_partition *parts;
+ int nb_parts = 0;
+ int parsed_nr_parts = 0;
+ char *part_type;
+ int i;
+ const char* master_name="master";
+
+ epxa10db_map.buswidth = 2;
+ epxa10db_map.size = 0x01000000;
+ printk(KERN_NOTICE "EPXA10DB flash: probing %d-bit flash bus\n",
epxa10db_map.buswidth*8);
+ mymtd = do_map_probe("cfi_probe", &epxa10db_map);
+ if (!mymtd)
+ return -ENXIO;
+ mymtd->module = THIS_MODULE;
+
+
+
+ /*
+ * Dynamic partition selection stuff (might override the static ones)
+ */
+ if (parsed_nr_parts == 0) {
+ int ret = fixup_epxa10db_partitions(mymtd, &parsed_parts);
+ if (ret > 0) {
+ part_type = "Compaq bootldr";
+ parsed_nr_parts = ret;
+ }
+ }
+
+ if (parsed_nr_parts > 0) {
+ parts = parsed_parts;
+ nb_parts = parsed_nr_parts;
+ }
+
+ if (nb_parts == 0) {
+ printk(KERN_NOTICE "EPXA10DB flash: no partition info available,
registering whole flash at once\n");
+ add_mtd_device(mymtd);
+ } else {
+ printk(KERN_NOTICE "Using %s partition definition\n", part_type);
+ add_mtd_partitions(mymtd, parts, nb_parts);
+ }
+
+ /* unlock the flash device */
+
+ for (i=0; i<mymtd->numeraseregions;i++){
+ int j;
+ for(j=0;j<mymtd->eraseregions[i].numblocks;j++){
+ mymtd->unlock(mymtd,mymtd->eraseregions[i].offset + j *
mymtd->eraseregions[i].erasesize,4);
+ }
+ }
+
+ /*
+ * Register mymtd as an mtd device so that we can read the
+ * protection data
+ */
+ mymtd->name=master_name;
+ add_mtd_device(mymtd);
+
+
+ return 0;
+}
+
+static void __exit epxa10db_mtd_cleanup(void)
+{
+ if (mymtd) {
+ del_mtd_partitions(mymtd);
+ map_destroy(mymtd);
+ if (parsed_parts)
+ kfree(parsed_parts);
+ }
+}
+
+
+/*
+ * This will do for now, once we decide which bootldr we're finally
+ * going to use then we'll remove this function and do it properly
+ *
+ * Partions are currently (as offsets from base of flash):
+ * 0x00000000 - 0x003FFFFF - bootloader (!)
+ * 0x00400000 - 0x00FFFFFF - Flashdisk
+ */
+
+int fixup_epxa10db_partitions(struct mtd_info *master, struct mtd_partition
**pparts)
+{
+ struct mtd_partition *parts;
+ int ret, i;
+ int npartitions = 0;
+ char *names;
+ const char *name = "jffs";
+
+ printk("Fixing up epxa10db partitions\n");
+ npartitions=1;
+ parts = kmalloc(npartitions*sizeof(*parts)+strlen(name), GFP_KERNEL);
+ if (!parts) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ i=0;
+ names = (char *)&parts[npartitions];
+ parts[i].name = names;
+ names += strlen(name) + 1;
+ strcpy(parts[i].name, name);
+
+ parts[i].size = 0x00C00000;
+ parts[i].offset = 0x00400000;
+ parts[i].mask_flags = 0;
+
+
+ out:
+ *pparts = parts;
+ return npartitions;
+}
+
+module_init(epxa10db_mtd_init);
+module_exit(epxa10db_mtd_cleanup);
--- linux_2.4.13/Documentation/Configure.help Mon Oct 29 15:47:06 2001
+++ linux/Documentation/Configure.help Wed Oct 31 10:10:53 2001
@@ -12261,6 +12273,12 @@ CONFIG_MTD_OCELOT
NVRAM on the Momenco Ocelot board. If you have one of these boards
and would like access to either of these, say 'Y'.
+Flash chip mapping on epxa10db
+CONFIG_MTD_EPXA10DB
+ This enables support for the flash devices on the Altera
+ Excalibur XA10 Development Board. If you are building a kernel
+ for on of these boards then you should say 'Y' otherwise say 'N'.
+
USB (Universal Serial Bus) support
CONFIG_USB
Universal Serial Bus (USB) is a specification for a serial bus
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