diff options
author | Arseniy Krasnov <avkrasnov@salutedevices.com> | 2024-05-08 02:09:03 +0300 |
---|---|---|
committer | Miquel Raynal <miquel.raynal@bootlin.com> | 2024-05-27 14:52:11 +0300 |
commit | 04a81b4f9ba1a473af7715168306c23ca4e15a25 (patch) | |
tree | a6d6f177085199727989232219f826f71f1d53aa | |
parent | 2234585f5c12f2a633fff715cca32ce0b40cfa29 (diff) | |
download | linux-04a81b4f9ba1a473af7715168306c23ca4e15a25.tar.xz |
mtd: rawnand: meson: read/write access for boot ROM pages
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@salutedevices.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20240507230903.3399594-4-avkrasnov@salutedevices.com
-rw-r--r-- | drivers/mtd/nand/raw/meson_nand.c | 58 |
1 files changed, 48 insertions, 10 deletions
diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c index 956f9440cb9e..9eb5470344d0 100644 --- a/drivers/mtd/nand/raw/meson_nand.c +++ b/drivers/mtd/nand/raw/meson_nand.c @@ -35,6 +35,7 @@ #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 DMA_ADDR_ALIGN 8 +#define NFC_SHORT_MODE_ECC_SZ 384 + #define ECC_CHECK_RETURN_FF (-1) #define NAND_CE0 (0xe << 10) @@ -125,6 +128,8 @@ struct meson_nfc_nand_chip { u32 twb; u32 tadl; u32 tbers_max; + u32 boot_pages; + u32 boot_page_step; u32 bch_mode; u8 *data_buf; @@ -298,33 +303,46 @@ static void meson_nfc_cmd_seed(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, int 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); struct meson_nfc *nfc = nand_get_controller_data(mtd_to_nand(mtd)); - 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); @@ -1425,6 +1443,26 @@ meson_nfc_nand_chip_init(struct device *dev, if (ret) return ret; + if (nand->options & NAND_IS_BOOT_MEDIUM) { + ret = of_property_read_u32(np, "amlogic,boot-pages", + &meson_chip->boot_pages); + if (ret) { + dev_err(dev, "could not retrieve 'amlogic,boot-pages' property: %d", + ret); + nand_cleanup(nand); + return ret; + } + + ret = of_property_read_u32(np, "amlogic,boot-page-step", + &meson_chip->boot_page_step); + if (ret) { + dev_err(dev, "could not retrieve 'amlogic,boot-page-step' property: %d", + ret); + nand_cleanup(nand); + return ret; + } + } + ret = mtd_device_register(mtd, NULL, 0); if (ret) { dev_err(dev, "failed to register MTD device: %d\n", ret); |