[ar7] add Titan MTD partitionning support (#6632)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@21691 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 234 insertions, 0 deletions

diff --git a/target/linux/ar7/files-2.6.32/drivers/mtd/titanpart.c b/target/linux/ar7/files-2.6.32/drivers/mtd/titanpart.c
new file mode 100644
index 0000000000..74f8251a23
--- /dev/null
+++ b/target/linux/ar7/files-2.6.32/drivers/mtd/titanpart.c
@@ -0,0 +1,234 @@
+#include <linux/kernel.h>
+#include <linux/slab.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/bootmem.h>
+#include <linux/magic.h>
+#include <asm/mach-ar7/prom.h>
+
+#define IMAGE_A_SIZE 0X3c0000
+#define WRTP_PARTS	14
+#define NSP_IMG_MAGIC_NUMBER		le32_to_cpu(0x4D544443)
+#define NSP_IMG_SECTION_TYPE_KERNEL		(0x01)
+#define NSP_IMG_SECTION_TYPE_FILESYSTEM_ROOT	(0x02)
+#define NSP_IMG_SECTION_TYPE_FILESYSTEM		(0x03)
+#define MAX_NUM_PARTITIONS 14
+
+static int part_count=0;
+static struct mtd_partition titan_parts[WRTP_PARTS];
+
+
+struct nsp_img_hdr_head
+{
+	unsigned int	magic;		/* Magic number to identify this image header */
+	unsigned int	boot_offset;	/* Offset from start of header to kernel code. */
+	unsigned int	flags;		/* Image flags. */
+	unsigned int	hdr_version;	/* Version of this header. */
+	unsigned int	hdr_size;	/* The complete size of all portions of the header */
+	unsigned int	prod_id;	/* This product id */
+	unsigned int	rel_id;		/* Which release this is */
+	unsigned int	version;	/* name-MMM.nnn.ooo-rxx => 0xMMnnooxx. See comment
+					   below */
+	unsigned int	image_size;	/* Image size (including header) */
+	unsigned int	info_offset;	/* Offset from start of header to info block */
+	unsigned int	sect_info_offset;	/* Offset from start of header to section desc */
+	unsigned int	chksum_offset;	/* Offset from start of header to chksum block */
+	unsigned int    pad1;
+};
+
+struct nsp_img_hdr_section_info
+{
+	unsigned int	num_sects;	/* Number of section (and section desc blocks) in this image */
+	unsigned int	sect_size;	/* Size of a SINGLE section_desc block */
+	unsigned int	sections_offset;	/* Offset to from start of header to the start of the section blocks */
+};
+
+/* There will be one of more of the following stuctures in the image header. Each
+   section will have one of these blocks. */
+struct nsp_img_hdr_sections
+{
+	unsigned int	offset;		/* Offset of section from start of NSP_IMG_HDR_HEAD */
+	unsigned int	total_size;	/* Size of section (including pad size.) */
+	unsigned int	raw_size;	/* Size of section only */
+	unsigned int	flags;		/* Section flags */
+	unsigned int	chksum;		/* Section checksum */
+	unsigned int	type;		/* Section type. What kind of info does this section describe */
+	char		name[16];	/* Reference name for this section. */
+};
+
+
+
+
+
+static int	titan_parse_env_address(char *env_name, unsigned int *flash_base,
+				unsigned int *flash_end)
+{
+	char	image_name[30];
+	char	*env_ptr;
+	char	*base_ptr;
+	char	*end_ptr;
+	char * string_ptr;
+	/* Get the image variable */
+	env_ptr = prom_getenv(env_name);
+	if(!env_ptr){
+		printk("titan: invalid env name, %s.\n", env_name);
+		return -1;	/* Error, no image variable */
+	}
+	strncpy(image_name, env_ptr, 30);
+	image_name[29]=0;
+	string_ptr = image_name;
+	/* Extract the start and stop addresses of the partition */
+	base_ptr = strsep(&string_ptr, ",");
+	end_ptr = strsep(&string_ptr, ",");
+	if ((base_ptr == NULL) || (end_ptr == NULL)) {	
+		printk("titan: Couldn't tokenize %s start,end.\n", image_name);
+		return -1;
+	}
+
+	*flash_base = (unsigned int) simple_strtol(base_ptr, NULL, 0);
+	*flash_end = (unsigned int) simple_strtol(end_ptr, NULL, 0);
+	if((!*flash_base) || (!*flash_end)) {
+		printk("titan: Unable to convert :%s: :%s: into start,end values.\n",
+				env_name, image_name);
+		return -1;
+	}
+	*flash_base &= 0x0fffffff;
+	*flash_end &= 0x0fffffff;
+	return 0;
+}
+
+
+
+static int	titan_get_single_image(char *bootcfg_name, unsigned int *flash_base,
+				unsigned int *flash_end)
+{
+	char	*env_ptr;
+	char	*base_ptr;
+	char	*end_ptr;
+	char	image_name[30];
+	char * string_ptr;
+
+	if(!bootcfg_name || !flash_base || !flash_end)
+		return -1;
+
+	env_ptr = prom_getenv(bootcfg_name);
+	if(!env_ptr){
+		printk("titan: %s variable not found.\n", bootcfg_name);
+		return -1;	/* Error, no bootcfg variable */
+	}
+
+	string_ptr = image_name;
+	/* Save off the image name */
+	strncpy(image_name, env_ptr, 30);
+	image_name[29]=0;
+
+	end_ptr=strsep(&string_ptr, "\"");
+	base_ptr=strsep(&string_ptr, "\"");		/* Loose the last " */
+	if(!end_ptr || !base_ptr){
+		printk("titan: invalid bootcfg format, %s.\n", image_name);
+		return -1;	/* Error, invalid bootcfg variable */
+	}
+
+	/* Now, parse the addresses */
+	return titan_parse_env_address(base_ptr, flash_base, flash_end);
+}
+
+
+
+static void titan_add_partition(char * env_name, unsigned int flash_base, unsigned int flash_end)
+{
+		titan_parts[part_count].name = env_name;
+		titan_parts[part_count].offset = flash_base;
+		titan_parts[part_count].size = flash_end-flash_base;
+		titan_parts[part_count].mask_flags = (strcmp(env_name, "bootloader")==0|| 
+			strcmp(env_name, "boot_env")==0 ||
+			strcmp(env_name, "full_image")==0 )?MTD_WRITEABLE:0;
+		part_count++;
+
+}
+int create_titan_partitions(struct mtd_info *master,
+	struct mtd_partition **pparts,
+	unsigned long origin)
+{
+	struct nsp_img_hdr_head		hdr;
+	struct nsp_img_hdr_section_info	sect_info;
+	struct nsp_img_hdr_sections	section;
+	unsigned int			flash_base, flash_end;
+	unsigned int			start, end;
+	char				*name;
+	int	i;
+	int	total_sects=0;
+	size_t len;
+
+	/* Get the bootcfg env variable first */
+	if(titan_get_single_image("BOOTCFG", &flash_base, &flash_end)) {
+		/* Error, fallback */
+		return -1;
+	}
+
+	/* Get access to the header, and do some validation checks */
+	//hdr=(struct nsp_img_hdr_head*)flash_base;
+	master->read(master, flash_base, sizeof(struct nsp_img_hdr_head), &len, (uint8_t *)&hdr);
+	if(hdr.magic != NSP_IMG_MAGIC_NUMBER)
+		return -1;	/* Not a single image */
+
+	master->read(master, flash_base + hdr.sect_info_offset, sizeof(struct nsp_img_hdr_section_info), &len, (uint8_t *)&sect_info);
+
+	/* Look for the root fs, and add it first. This way we KNOW where the rootfs is */
+	for(i=0; i< sect_info.num_sects && i<MAX_NUM_PARTITIONS; i++){
+		master->read(master, flash_base + sect_info.sections_offset + (i * sect_info.sect_size) , sizeof(struct nsp_img_hdr_sections), &len, (uint8_t *)&section);
+		/* Add only the root partition */
+		if(section.type != NSP_IMG_SECTION_TYPE_FILESYSTEM_ROOT){
+			continue;
+		}
+		start=flash_base + section.offset;
+		end=start + section.total_size;
+		titan_add_partition("root", start, end);
+		total_sects++;
+		
+	}
+
+	for(i=0; i< sect_info.num_sects && i<MAX_NUM_PARTITIONS; i++){
+
+		master->read(master, flash_base + sect_info.sections_offset + (i * sect_info.sect_size) , sizeof(struct nsp_img_hdr_sections), &len, (uint8_t *)&section);
+
+		name=section.name;
+		if(section.type == NSP_IMG_SECTION_TYPE_FILESYSTEM_ROOT)
+		{
+			name = "rootfs";
+			start=flash_base + section.offset;
+			end=flash_end;
+			titan_add_partition(name, start, end);
+			total_sects++;
+		}
+		else if(section.type == NSP_IMG_SECTION_TYPE_KERNEL)
+		{
+			name = "kernel";
+			start=flash_base + section.offset;
+			end=start + section.total_size;
+			titan_add_partition(name, start, end);
+			total_sects++;
+		}
+
+	}
+
+	/* Next, lets add the single image */
+	titan_add_partition("primary_image", flash_base, flash_end);
+	total_sects++;
+
+
+	titan_add_partition("full_image", 0,  master->size);
+	total_sects++;
+
+	if (!titan_parse_env_address("BOOTLOADER", &start, &end)){
+		titan_add_partition("bootloader", start, end);
+		total_sects++;
+	}
+	if (!titan_parse_env_address("boot_env", &start, &end)){
+		titan_add_partition("boot_env", start, end);
+		total_sects++;
+	}
+	*pparts = titan_parts;
+	return total_sects;
+}