1 files changed, 350 insertions, 0 deletions
diff --git a/drivers/mtd/maps/ceiva.c b/drivers/mtd/maps/ceiva.c
new file mode 100644
index 000000000000..da8584a662f4
--- /dev/null
+++ b/drivers/mtd/maps/ceiva.c
@@ -0,0 +1,350 @@
+/*
+ * Ceiva flash memory driver.
+ * Copyright (C) 2002 Rob Scott <rscott@mtrob.fdns.net>
+ *
+ * Note: this driver supports jedec compatible devices. Modification
+ * for CFI compatible devices should be straight forward: change
+ * jedec_probe to cfi_probe.
+ *
+ * Based on: sa1100-flash.c, which has the following copyright:
+ * Flash memory access on SA11x0 based devices
+ *
+ * (C) 2000 Nicolas Pitre <nico@cam.org>
+ *
+ * $Id: ceiva.c,v 1.11 2004/09/16 23:27:12 gleixner Exp $
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/concat.h>
+
+#include <asm/hardware.h>
+#include <asm/mach-types.h>
+#include <asm/io.h>
+#include <asm/sizes.h>
+
+/*
+ * This isn't complete yet, so...
+ */
+#define CONFIG_MTD_CEIVA_STATICMAP
+
+#ifdef CONFIG_MTD_CEIVA_STATICMAP
+/*
+ * See include/linux/mtd/partitions.h for definition of the mtd_partition
+ * structure.
+ *
+ * Please note:
+ *  1. The flash size given should be the largest flash size that can
+ *     be accomodated.
+ *
+ *  2. The bus width must defined in clps_setup_flash.
+ *
+ * The MTD layer will detect flash chip aliasing and reduce the size of
+ * the map accordingly.
+ *
+ */
+
+#ifdef CONFIG_ARCH_CEIVA
+/* Flash / Partition sizing */
+/* For the 28F8003, we use the block mapping to calcuate the sizes */
+#define MAX_SIZE_KiB                  (16 + 8 + 8 + 96 + (7*128))
+#define BOOT_PARTITION_SIZE_KiB       (16)
+#define PARAMS_PARTITION_SIZE_KiB     (8)
+#define KERNEL_PARTITION_SIZE_KiB     (4*128)
+/* Use both remaing portion of first flash, and all of second flash */
+#define ROOT_PARTITION_SIZE_KiB       (3*128) + (8*128)
+
+static struct mtd_partition ceiva_partitions[] = {
+	{
+		.name = "Ceiva BOOT partition",
+		.size   = BOOT_PARTITION_SIZE_KiB*1024,
+		.offset = 0,
+
+	},{
+		.name = "Ceiva parameters partition",
+		.size   = PARAMS_PARTITION_SIZE_KiB*1024,
+		.offset = (16 + 8) * 1024,
+	},{
+		.name = "Ceiva kernel partition",
+		.size = (KERNEL_PARTITION_SIZE_KiB)*1024,
+		.offset = 0x20000,
+
+	},{
+		.name = "Ceiva root filesystem partition",
+		.offset = MTDPART_OFS_APPEND,
+		.size = (ROOT_PARTITION_SIZE_KiB)*1024,
+	}
+};
+#endif
+
+static int __init clps_static_partitions(struct mtd_partition **parts)
+{
+	int nb_parts = 0;
+
+#ifdef CONFIG_ARCH_CEIVA
+	if (machine_is_ceiva()) {
+		*parts       = ceiva_partitions;
+		nb_parts     = ARRAY_SIZE(ceiva_partitions);
+	}
+#endif
+	return nb_parts;
+}
+#endif
+
+struct clps_info {
+	unsigned long base;
+	unsigned long size;
+	int width;
+	void *vbase;
+	struct map_info *map;
+	struct mtd_info *mtd;
+	struct resource *res;
+};
+
+#define NR_SUBMTD 4
+
+static struct clps_info info[NR_SUBMTD];
+
+static int __init clps_setup_mtd(struct clps_info *clps, int nr, struct mtd_info **rmtd)
+{
+	struct mtd_info *subdev[nr];
+	struct map_info *maps;
+	int i, found = 0, ret = 0;
+
+	/*
+	 * Allocate the map_info structs in one go.
+	 */
+	maps = kmalloc(sizeof(struct map_info) * nr, GFP_KERNEL);
+	if (!maps)
+		return -ENOMEM;
+	memset(maps, 0, sizeof(struct map_info) * nr);
+	/*
+	 * Claim and then map the memory regions.
+	 */
+	for (i = 0; i < nr; i++) {
+		if (clps[i].base == (unsigned long)-1)
+			break;
+
+		clps[i].res = request_mem_region(clps[i].base, clps[i].size, "clps flash");
+		if (!clps[i].res) {
+			ret = -EBUSY;
+			break;
+		}
+
+		clps[i].map = maps + i;
+
+		clps[i].map->name = "clps flash";
+		clps[i].map->phys = clps[i].base;
+
+		clps[i].vbase = ioremap(clps[i].base, clps[i].size);
+		if (!clps[i].vbase) {
+			ret = -ENOMEM;
+			break;
+		}
+
+		clps[i].map->virt = (void __iomem *)clps[i].vbase;
+		clps[i].map->bankwidth = clps[i].width;
+		clps[i].map->size = clps[i].size;
+
+		simple_map_init(&clps[i].map);
+
+		clps[i].mtd = do_map_probe("jedec_probe", clps[i].map);
+		if (clps[i].mtd == NULL) {
+			ret = -ENXIO;
+			break;
+		}
+		clps[i].mtd->owner = THIS_MODULE;
+		subdev[i] = clps[i].mtd;
+
+		printk(KERN_INFO "clps flash: JEDEC device at 0x%08lx, %dMiB, "
+			"%d-bit\n", clps[i].base, clps[i].mtd->size >> 20,
+			clps[i].width * 8);
+		found += 1;
+	}
+
+	/*
+	 * ENXIO is special.  It means we didn't find a chip when
+	 * we probed.  We need to tear down the mapping, free the
+	 * resource and mark it as such.
+	 */
+	if (ret == -ENXIO) {
+		iounmap(clps[i].vbase);
+		clps[i].vbase = NULL;
+		release_resource(clps[i].res);
+		clps[i].res = NULL;
+	}
+
+	/*
+	 * If we found one device, don't bother with concat support.
+	 * If we found multiple devices, use concat if we have it
+	 * available, otherwise fail.
+	 */
+	if (ret == 0 || ret == -ENXIO) {
+		if (found == 1) {
+			*rmtd = subdev[0];
+			ret = 0;
+		} else if (found > 1) {
+			/*
+			 * We detected multiple devices.  Concatenate
+			 * them together.
+			 */
+#ifdef CONFIG_MTD_CONCAT
+			*rmtd = mtd_concat_create(subdev, found,
+						  "clps flash");
+			if (*rmtd == NULL)
+				ret = -ENXIO;
+#else
+			printk(KERN_ERR "clps flash: multiple devices "
+			       "found but MTD concat support disabled.\n");
+			ret = -ENXIO;
+#endif
+		}
+	}
+
+	/*
+	 * If we failed, clean up.
+	 */
+	if (ret) {
+		do {
+			if (clps[i].mtd)
+				map_destroy(clps[i].mtd);
+			if (clps[i].vbase)
+				iounmap(clps[i].vbase);
+			if (clps[i].res)
+				release_resource(clps[i].res);
+		} while (i--);
+
+		kfree(maps);
+	}
+
+	return ret;
+}
+
+static void __exit clps_destroy_mtd(struct clps_info *clps, struct mtd_info *mtd)
+{
+	int i;
+
+	del_mtd_partitions(mtd);
+
+	if (mtd != clps[0].mtd)
+		mtd_concat_destroy(mtd);
+
+	for (i = NR_SUBMTD; i >= 0; i--) {
+		if (clps[i].mtd)
+			map_destroy(clps[i].mtd);
+		if (clps[i].vbase)
+			iounmap(clps[i].vbase);
+		if (clps[i].res)
+			release_resource(clps[i].res);
+	}
+	kfree(clps[0].map);
+}
+
+/*
+ * We define the memory space, size, and width for the flash memory
+ * space here.
+ */
+
+static int __init clps_setup_flash(void)
+{
+	int nr;
+
+#ifdef CONFIG_ARCH_CEIVA
+	if (machine_is_ceiva()) {
+		info[0].base = CS0_PHYS_BASE;
+		info[0].size = SZ_32M;
+		info[0].width = CEIVA_FLASH_WIDTH;
+		info[1].base = CS1_PHYS_BASE;
+		info[1].size = SZ_32M;
+		info[1].width = CEIVA_FLASH_WIDTH;
+		nr = 2;
+	}
+#endif
+	return nr;
+}
+
+static struct mtd_partition *parsed_parts;
+static const char *probes[] = { "cmdlinepart", "RedBoot", NULL };
+
+static void __init clps_locate_partitions(struct mtd_info *mtd)
+{
+	const char *part_type = NULL;
+	int nr_parts = 0;
+	do {
+		/*
+		 * Partition selection stuff.
+		 */
+		nr_parts = parse_mtd_partitions(mtd, probes, &parsed_parts, 0);
+		if (nr_parts > 0) {
+			part_type = "command line";
+			break;
+		}
+#ifdef CONFIG_MTD_CEIVA_STATICMAP
+		nr_parts = clps_static_partitions(&parsed_parts);
+		if (nr_parts > 0) {
+			part_type = "static";
+			break;
+		}
+		printk("found: %d partitions\n", nr_parts);
+#endif
+	} while (0);
+
+	if (nr_parts == 0) {
+		printk(KERN_NOTICE "clps flash: no partition info "
+			"available, registering whole flash\n");
+		add_mtd_device(mtd);
+	} else {
+		printk(KERN_NOTICE "clps flash: using %s partition "
+			"definition\n", part_type);
+		add_mtd_partitions(mtd, parsed_parts, nr_parts);
+	}
+
+	/* Always succeeds. */
+}
+
+static void __exit clps_destroy_partitions(void)
+{
+	if (parsed_parts)
+		kfree(parsed_parts);
+}
+
+static struct mtd_info *mymtd;
+
+static int __init clps_mtd_init(void)
+{
+	int ret;
+	int nr;
+
+	nr = clps_setup_flash();
+	if (nr < 0)
+		return nr;
+
+	ret = clps_setup_mtd(info, nr, &mymtd);
+	if (ret)
+		return ret;
+
+	clps_locate_partitions(mymtd);
+
+	return 0;
+}
+
+static void __exit clps_mtd_cleanup(void)
+{
+	clps_destroy_mtd(info, mymtd);
+	clps_destroy_partitions();
+}
+
+module_init(clps_mtd_init);
+module_exit(clps_mtd_cleanup);
+
+MODULE_AUTHOR("Rob Scott");
+MODULE_DESCRIPTION("Cirrus Logic JEDEC map driver");
+MODULE_LICENSE("GPL");