qi-gta02-compute-and-append-dynparts.patch

This adds dynamic partition computation support for Qi on GTA02.
It's for compatability with existing GTA02 using U-Boot partition
scheme where a bad block in the previous partition moves on the
start of the next partition by one block.

It's important that Qi has no private state, so we need to compute
the NAND arrangement each boot.  It turns out this is extremely fast
using Qi's bad block code originally from Xinagfu.

Signed-off-by: Andy Green <andy@openmoko.com>

qiboot/src/cpu/s3c2442/gta02.c

@@ -30,6 +30,7 @@
 #include <i2c-bitbang-s3c24xx.h>
 #include <pcf50633.h>
 #include <glamo-init.h>
+#include <string.h>
 
 #define GTA02_DEBUG_UART 2
 #define PCF50633_I2C_ADS 0x73
@@ -37,6 +38,30 @@
 
 static int battery_condition_reasonable = 0;
 
+struct nand_dynparts {
+	const char *name; /* name of this partition for Linux */
+	u32 good_length; /* bytes needed from good sectors in this partition */
+};
+
+/*
+ * These are the NAND partitions U-Boot leaves in GTA02 NAND.
+ * The "dynparts" business means that in the case of bad blocks, all the
+ * following partitions move up accordingly to have the right amount of
+ * good blocks.  To allow for this, the length of the last, largest
+ * partition is computed according to the bad blocks that went before.
+ */
+
+static struct nand_dynparts nand_dynparts[] = {
+	{ "qi",            0x40000 },
+	{ "depr-ub-env",   0x40000 },
+	{ "kernel",       0x800000 },
+	{ "depr",          0xa0000 },
+	{ "identity-ext2", 0x40000 },
+	{ "rootfs",              0 },
+};
+
+static u32 nand_extent_block512 = 256 * 1024 * 1024 / 512;
+
 const struct pcf50633_init pcf50633_init[] = {
 
 	{ PCF50633_REG_OOCWAKE,		0xd3 }, /* wake from ONKEY,EXTON!,RTC,USB,ADP */
@@ -455,6 +480,61 @@ void post_serial_init_gta02(void)
 		puts("BATTERY CONDITION LOW\n");
 }
 
+/*
+ * create and append dynparts Linux kernel commandline
+ */
+
+char * append_device_specific_cmdline_gta02(char * cmdline)
+{
+	int n = 0;
+	u32 block512 = 0;
+	u32 start_block512 = 0;
+	char term = ',';
+	const u32 GTA02_NAND_READBLOCK_SIZE = 2048;
+	extern int s3c2442_nand_is_bad_block(unsigned long block_index_512);
+
+	cmdline += strlen(strcpy(cmdline,
+			       " mtdparts=physmap-flash:-(nor);neo1973-nand:"));
+
+	while (n < ARRAY_SIZE(nand_dynparts)) {
+
+		if (nand_dynparts[n].good_length)
+			while (nand_dynparts[n].good_length) {
+				if (!s3c2442_nand_is_bad_block(block512))
+					nand_dynparts[n].good_length -=
+						      GTA02_NAND_READBLOCK_SIZE;
+				block512 += GTA02_NAND_READBLOCK_SIZE / 512;
+			}
+		else {
+			/*
+			 * cannot afford to compute real size of last block
+			 * set it to extent - end of last block
+			 */
+			block512 = nand_extent_block512;
+			term = ' ';
+		}
+
+		*cmdline++ = '0';
+		*cmdline++ = 'x';
+		set32(cmdline, (block512 - start_block512) * 512);
+		cmdline += 8;
+		*cmdline++ = '(';
+		cmdline += strlen(strcpy(cmdline, nand_dynparts[n].name));
+		*cmdline++ = ')';
+		*cmdline++ = term;
+
+		/* stash a copy of real offset for each partition */
+		nand_dynparts[n].good_length = start_block512;
+
+		start_block512 = block512;
+
+		n++;
+	}
+
+	*cmdline = '\0';
+
+	return cmdline;
+}
 
 /*
  * our API for bootloader on this machine
@@ -470,20 +550,13 @@ const struct board_api board_api_gta02 = {
 	.is_this_board = is_this_board_gta02,
 	.port_init = port_init_gta02,
 	.post_serial_init = post_serial_init_gta02,
+	.append_device_specific_cmdline = append_device_specific_cmdline_gta02,
 	.putc = putc_gta02,
 	.close = close_gta02,
 	.get_ui_keys = get_ui_keys_gta02,
 	.get_ui_debug = get_ui_debug_gta02,
 	.set_ui_indication = set_ui_indication_gta02,
-	.commandline_board = "mtdparts=physmap-flash:-(nor);" \
+	.commandline_board = "loglevel=4 " \
-				       "neo1973-nand:" \
-				       "0x00040000(qi)," \
-				       "0x00040000(cmdline)," \
-				       "0x00800000(backupkernel)," \
-				       "0x000a0000(extra)," \
-				       "0x00040000(identity)," \
-				       "0x0f6a0000(backuprootfs) " \
-				      "loglevel=4 " \
 				      "console=tty0 " \
 				      "console=ttySAC2,115200 " \
 				      "init=/sbin/init " \