Commit 04a81b4f authored by Arseniy Krasnov's avatar Arseniy Krasnov Committed by Miquel Raynal

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: default avatarArseniy Krasnov <avkrasnov@salutedevices.com>
Signed-off-by: default avatarMiquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20240507230903.3399594-4-avkrasnov@salutedevices.com
parent 2234585f
......@@ -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;
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,
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);
......
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