Boot ROM on Meson needs some pages to be read/written in a special mode:
384 byte ECC mode (so called "short" by Amlogic) and with scrambling
enabled. Such pages are located on the chip in the following way (for
example):
[ p0 ][ p1 ][ p2 ][ p3 ][ p4 ][ p5 ][ p6 ][ p7 ] ... [ pN ]
^ ^ ^ ^
pX is page number "X". "^" means "special" page used by boot ROM - e.g.
every 2nd page in the range of [0, 7]. Step (2 here) and last page in
range is read from the device tree.
Signed-off-by: Arseniy Krasnov <avkrasnov@...>
---
drivers/mtd/nand/raw/meson_nand.c | 56 +++++++++++++++++++++++++------
1 file changed, 46 insertions(+), 10 deletions(-)
diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c
index 19f005202b..54ea035d8d 100644
--- a/drivers/mtd/nand/raw/meson_nand.c
+++ b/drivers/mtd/nand/raw/meson_nand.c
@@ -40,6 +40,7 @@
#define NFC_CMD_RB BIT(20)
#define NFC_CMD_SCRAMBLER_ENABLE BIT(19)
#define NFC_CMD_SCRAMBLER_DISABLE 0
+#define NFC_CMD_SHORTMODE_ENABLE 1
#define NFC_CMD_SHORTMODE_DISABLE 0
#define NFC_CMD_RB_INT BIT(14)
#define NFC_CMD_RB_INT_NO_PIN ((0xb << 10) | BIT(18) | BIT(16))
@@ -78,6 +79,8 @@
#define DMA_DIR(dir) ((dir) ? NFC_CMD_N2M : NFC_CMD_M2N)
+#define NFC_SHORT_MODE_ECC_SZ 384
+
#define ECC_CHECK_RETURN_FF -1
#define NAND_CE0 (0xe << 10)
@@ -141,6 +144,8 @@
struct meson_nfc_nand_chip {
struct list_head node;
struct nand_chip nand;
+ u32 boot_pages;
+ u32 boot_page_step;
u32 bch_mode;
u8 *data_buf;
@@ -229,33 +234,46 @@ static void meson_nfc_cmd_seed(const struct meson_nfc *nfc, u32 seed)
nfc->reg_base + NFC_REG_CMD);
}
+static int meson_nfc_is_boot_page(struct nand_chip *nand, int page)
+{
+ const struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand);
+
+ return (nand->options & NAND_IS_BOOT_MEDIUM) &&
+ !(page % meson_chip->boot_page_step) &&
+ (page < meson_chip->boot_pages);
+}
+
static void meson_nfc_cmd_access(struct nand_chip *nand, bool raw, bool dir, int page)
{
+ const struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand);
struct mtd_info *mtd = nand_to_mtd(nand);
const struct meson_nfc *nfc = nand_get_controller_data(mtd_to_nand(mtd));
- const struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand);
- u32 bch = meson_chip->bch_mode, cmd;
int len = mtd->writesize, pagesize, pages;
int scrambler;
+ u32 cmd;
if (nand->options & NAND_NEED_SCRAMBLING)
scrambler = NFC_CMD_SCRAMBLER_ENABLE;
else
scrambler = NFC_CMD_SCRAMBLER_DISABLE;
- pagesize = nand->ecc.size;
-
if (raw) {
len = mtd->writesize + mtd->oobsize;
cmd = len | scrambler | DMA_DIR(dir);
- writel(cmd, nfc->reg_base + NFC_REG_CMD);
- return;
- }
+ } else if (meson_nfc_is_boot_page(nand, page)) {
+ pagesize = NFC_SHORT_MODE_ECC_SZ >> 3;
+ pages = mtd->writesize / 512;
- pages = len / nand->ecc.size;
+ scrambler = NFC_CMD_SCRAMBLER_ENABLE;
+ cmd = CMDRWGEN(DMA_DIR(dir), scrambler, NFC_ECC_BCH8_1K,
+ NFC_CMD_SHORTMODE_ENABLE, pagesize, pages);
+ } else {
+ pagesize = nand->ecc.size >> 3;
+ pages = len / nand->ecc.size;
- cmd = CMDRWGEN(DMA_DIR(dir), scrambler, bch,
- NFC_CMD_SHORTMODE_DISABLE, pagesize, pages);
+ cmd = CMDRWGEN(DMA_DIR(dir), scrambler, meson_chip->bch_mode,
+ NFC_CMD_SHORTMODE_DISABLE, pagesize, pages);
+ }
if (scrambler == NFC_CMD_SCRAMBLER_ENABLE)
meson_nfc_cmd_seed(nfc, page);
@@ -1132,6 +1150,24 @@ static int meson_nfc_nand_chip_init(struct udevice *dev, struct meson_nfc *nfc,
goto err_chip_buf_free;
}
+ if (nand->options & NAND_IS_BOOT_MEDIUM) {
+ ret = ofnode_read_u32(node, "amlogic,boot-pages",
+ &meson_chip->boot_pages);
+ if (ret) {
+ dev_err(dev, "could not retrieve 'amlogic,boot-pages' property: %d",
+ ret);
+ goto err_chip_buf_free;
+ }
+
+ ret = ofnode_read_u32(node, "amlogic,boot-page-step",
+ &meson_chip->boot_page_step);
+ if (ret) {
+ dev_err(dev, "could not retrieve 'amlogic,boot-page-step' property: %d",
+ ret);
+ goto err_chip_buf_free;
+ }
+ }
+
ret = nand_register(0, mtd);
if (ret) {
dev_err(dev, "'nand_register()' failed: %d\n", ret);
--
2.30.1
