i.MX6: nand: extend nandbcb command for imx6UL(L)
Firmware Configuration Block(FCB) for imx6ul(l) needs to be
BCH encoded.
Signed-off-by: Parthiban Nallathambi <pn@denx.de>
Acked-by: Shyam Saini <shyam.saini@amarulasolutions.com>
Acked-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/mach-imx/cmd_nandbcb.c b/arch/arm/mach-imx/cmd_nandbcb.c
index 7811c61..1a2e017 100644
--- a/arch/arm/mach-imx/cmd_nandbcb.c
+++ b/arch/arm/mach-imx/cmd_nandbcb.c
@@ -14,6 +14,7 @@
#include <asm/io.h>
#include <jffs2/jffs2.h>
+#include <linux/bch.h>
#include <linux/mtd/mtd.h>
#include <asm/mach-imx/imx-nandbcb.h>
@@ -25,6 +26,68 @@
#define BF_VAL(v, bf) (((v) & bf##_MASK) >> bf##_OFFSET)
#define GETBIT(v, n) (((v) >> (n)) & 0x1)
+#if defined(CONFIG_MX6UL) || defined(CONFIG_MX6ULL)
+static uint8_t reverse_bit(uint8_t b)
+{
+ b = (b & 0xf0) >> 4 | (b & 0x0f) << 4;
+ b = (b & 0xcc) >> 2 | (b & 0x33) << 2;
+ b = (b & 0xaa) >> 1 | (b & 0x55) << 1;
+
+ return b;
+}
+
+static void encode_bch_ecc(void *buf, struct fcb_block *fcb, int eccbits)
+{
+ int i, j, m = 13;
+ int blocksize = 128;
+ int numblocks = 8;
+ int ecc_buf_size = (m * eccbits + 7) / 8;
+ struct bch_control *bch = init_bch(m, eccbits, 0);
+ u8 *ecc_buf = kzalloc(ecc_buf_size, GFP_KERNEL);
+ u8 *tmp_buf = kzalloc(blocksize * numblocks, GFP_KERNEL);
+ u8 *psrc, *pdst;
+
+ /*
+ * The blocks here are bit aligned. If eccbits is a multiple of 8,
+ * we just can copy bytes. Otherwiese we must move the blocks to
+ * the next free bit position.
+ */
+ WARN_ON(eccbits % 8);
+
+ memcpy(tmp_buf, fcb, sizeof(*fcb));
+
+ for (i = 0; i < numblocks; i++) {
+ memset(ecc_buf, 0, ecc_buf_size);
+ psrc = tmp_buf + i * blocksize;
+ pdst = buf + i * (blocksize + ecc_buf_size);
+
+ /* copy data byte aligned to destination buf */
+ memcpy(pdst, psrc, blocksize);
+
+ /*
+ * imx-kobs use a modified encode_bch which reverse the
+ * bit order of the data before calculating bch.
+ * Do this in the buffer and use the bch lib here.
+ */
+ for (j = 0; j < blocksize; j++)
+ psrc[j] = reverse_bit(psrc[j]);
+
+ encode_bch(bch, psrc, blocksize, ecc_buf);
+
+ /* reverse ecc bit */
+ for (j = 0; j < ecc_buf_size; j++)
+ ecc_buf[j] = reverse_bit(ecc_buf[j]);
+
+ /* Here eccbuf is byte aligned and we can just copy it */
+ memcpy(pdst + blocksize, ecc_buf, ecc_buf_size);
+ }
+
+ kfree(ecc_buf);
+ kfree(tmp_buf);
+ free_bch(bch);
+}
+#else
+
static u8 calculate_parity_13_8(u8 d)
{
u8 p = 0;
@@ -50,6 +113,7 @@
for (i = 0; i < size; i++)
ecc[i] = calculate_parity_13_8(src[i]);
}
+#endif
static u32 calc_chksum(void *buf, size_t size)
{
@@ -231,8 +295,13 @@
goto dbbt_data_page_err;
}
+#if defined(CONFIG_MX6UL) || defined(CONFIG_MX6ULL)
+ /* 40 bit BCH, for i.MX6UL(L) */
+ encode_bch_ecc(fcb_raw_page + 32, fcb, 40);
+#else
memcpy(fcb_raw_page + 12, fcb, sizeof(struct fcb_block));
encode_hamming_13_8(fcb_raw_page + 12, fcb_raw_page + 12 + 512, 512);
+#endif
/*
* Set the first and second byte of OOB data to 0xFF, not 0x00. These
* bytes are used as the Manufacturers Bad Block Marker (MBBM). Since