[RFC PATCH 3/3] mtd: nand: add sunxi randomizer support

From: Boris BREZILLON
Date: Wed Apr 30 2014 - 21:10:32 EST

Add support for the HW randomizer available in the sunxi IP.

Signed-off-by: Boris BREZILLON <b.brezillon.dev@xxxxxxxxx>
---
drivers/mtd/nand/sunxi_nand.c | 511 +++++++++++++++++++++++++++++++++++++++++-
1 file changed, 500 insertions(+), 11 deletions(-)

diff --git a/drivers/mtd/nand/sunxi_nand.c b/drivers/mtd/nand/sunxi_nand.c
index 54d3ebd..2f76912 100644
--- a/drivers/mtd/nand/sunxi_nand.c
+++ b/drivers/mtd/nand/sunxi_nand.c
@@ -171,6 +171,7 @@ struct sunxi_nand_hw_ecc {
struct sunxi_nand_part {
struct nand_part part;
struct nand_ecc_ctrl ecc;
+ struct nand_rnd_ctrl rnd;
};

static inline struct sunxi_nand_part *
@@ -179,6 +180,17 @@ to_sunxi_nand_part(struct nand_part *part)
return container_of(part, struct sunxi_nand_part, part);
}

+struct sunxi_nand_hw_rnd {
+ int page;
+ int column;
+ int nseeds;
+ u16 *seeds;
+ u16 *subseeds;
+ u16 (*step)(struct mtd_info *mtd, u16 state, int column, int *left);
+ int left;
+ u16 state;
+};
+
struct sunxi_nand_chip {
struct list_head node;
struct nand_chip nand;
@@ -380,6 +392,175 @@ static void sunxi_nfc_write_buf(struct mtd_info *mtd, const uint8_t *buf,
}
}

+static u16 sunxi_nfc_hwrnd_step(struct sunxi_nand_hw_rnd *rnd, u16 state,
+ int count)
+{
+ state &= 0x7fff;
+ count *= 8;
+ while (count--)
+ state = ((state >> 1) |
+ ((((state >> 0) ^ (state >> 1)) & 1) << 14)) & 0x7fff;
+
+ return state;
+}
+
+static int sunxi_nfc_hwrnd_config(struct mtd_info *mtd, int page, int column,
+ enum nand_rnd_action action)
+{
+ struct nand_chip *nand = mtd->priv;
+ struct sunxi_nand_hw_rnd *rnd = nand->cur_rnd->priv;
+ u16 state;
+
+ if (page < 0 && column < 0) {
+ rnd->page = -1;
+ rnd->column = -1;
+ return 0;
+ }
+
+ if (column < 0)
+ column = 0;
+ if (page < 0)
+ page = rnd->page;
+
+ if (page < 0)
+ return -EINVAL;
+
+ if (page != rnd->page && action == NAND_RND_READ) {
+ int status;
+
+ status = nand_page_get_status(mtd, page);
+ if (status == NAND_PAGE_STATUS_UNKNOWN) {
+ nand->cmdfunc(mtd, NAND_CMD_RNDOUT, 0, -1);
+ sunxi_nfc_read_buf(mtd, nand->buffers->databuf,
+ mtd->writesize + mtd->oobsize);
+
+ if (nand_page_is_empty(mtd))
+ status = NAND_PAGE_EMPTY;
+ else
+ status = NAND_PAGE_FILLED;
+
+ nand_page_set_status(mtd, page, status);
+ nand->cmdfunc(mtd, NAND_CMD_RNDOUT, column, -1);
+ }
+ }
+
+ state = rnd->seeds[page % rnd->nseeds];
+ rnd->page = page;
+ rnd->column = column;
+
+ if (rnd->step) {
+ rnd->state = rnd->step(mtd, state, column, &rnd->left);
+ } else {
+ rnd->state = sunxi_nfc_hwrnd_step(rnd, state, column % 4096);
+ rnd->left = mtd->oobsize + mtd->writesize - column;
+ }
+
+ return 0;
+}
+
+static void sunxi_nfc_hwrnd_write_buf(struct mtd_info *mtd, const uint8_t *buf,
+ int len)
+{
+ struct nand_chip *nand = mtd->priv;
+ struct sunxi_nfc *nfc = to_sunxi_nfc(nand->controller);
+ struct sunxi_nand_hw_rnd *rnd = nand->cur_rnd->priv;
+ u32 tmp = readl(nfc->regs + NFC_REG_ECC_CTL);
+ int cnt;
+ int offs = 0;
+ int rndactiv;
+
+ tmp &= ~(NFC_RANDOM_DIRECTION | NFC_RANDOM_SEED | NFC_RANDOM_EN);
+ writel(tmp, nfc->regs + NFC_REG_ECC_CTL);
+
+ if (rnd->page < 0) {
+ sunxi_nfc_write_buf(mtd, buf, len);
+ return;
+ }
+
+ while (len > offs) {
+ cnt = len - offs;
+ if (cnt > 1024)
+ cnt = 1024;
+
+ rndactiv = nand_rnd_is_activ(mtd, rnd->page, rnd->column,
+ &cnt);
+ if (rndactiv > 0) {
+ writel(tmp | NFC_RANDOM_EN | (rnd->state << 16),
+ nfc->regs + NFC_REG_ECC_CTL);
+ if (rnd->left < cnt)
+ cnt = rnd->left;
+ }
+
+ sunxi_nfc_write_buf(mtd, buf + offs, cnt);
+
+ if (rndactiv > 0)
+ writel(tmp & ~NFC_RANDOM_EN,
+ nfc->regs + NFC_REG_ECC_CTL);
+
+ offs += cnt;
+ if (len <= offs)
+ break;
+
+ sunxi_nfc_hwrnd_config(mtd, -1, rnd->column + cnt,
+ NAND_RND_WRITE);
+ }
+}
+
+static void sunxi_nfc_hwrnd_read_buf(struct mtd_info *mtd, uint8_t *buf,
+ int len)
+{
+ struct nand_chip *nand = mtd->priv;
+ struct sunxi_nfc *nfc = to_sunxi_nfc(nand->controller);
+ struct sunxi_nand_hw_rnd *rnd = nand->cur_rnd->priv;
+ u32 tmp = readl(nfc->regs + NFC_REG_ECC_CTL);
+ int cnt;
+ int offs = 0;
+ int rndactiv;
+
+ tmp &= ~(NFC_RANDOM_DIRECTION | NFC_RANDOM_SEED | NFC_RANDOM_EN);
+ writel(tmp, nfc->regs + NFC_REG_ECC_CTL);
+
+ if (rnd->page < 0) {
+ sunxi_nfc_read_buf(mtd, buf, len);
+ return;
+ }
+
+ while (len > offs) {
+ cnt = len - offs;
+ if (cnt > 1024)
+ cnt = 1024;
+
+ if (nand_page_get_status(mtd, rnd->page) != NAND_PAGE_EMPTY &&
+ nand_rnd_is_activ(mtd, rnd->page, rnd->column, &cnt) > 0)
+ rndactiv = 1;
+ else
+ rndactiv = 0;
+
+ if (rndactiv > 0) {
+ writel(tmp | NFC_RANDOM_EN | (rnd->state << 16),
+ nfc->regs + NFC_REG_ECC_CTL);
+ if (rnd->left < cnt)
+ cnt = rnd->left;
+ }
+
+ if (buf)
+ sunxi_nfc_read_buf(mtd, buf + offs, cnt);
+ else
+ sunxi_nfc_read_buf(mtd, NULL, cnt);
+
+ if (rndactiv > 0)
+ writel(tmp & ~NFC_RANDOM_EN,
+ nfc->regs + NFC_REG_ECC_CTL);
+
+ offs += cnt;
+ if (len <= offs)
+ break;
+
+ sunxi_nfc_hwrnd_config(mtd, -1, rnd->column + cnt,
+ NAND_RND_READ);
+ }
+}
+
static uint8_t sunxi_nfc_read_byte(struct mtd_info *mtd)
{
uint8_t ret;
@@ -432,11 +613,35 @@ static int sunxi_nfc_hw_ecc_read_page(struct mtd_info *mtd,
struct sunxi_nand_hw_ecc *data = ecc->priv;
int steps = mtd->writesize / ecc->size;
unsigned int max_bitflips = 0;
+ int status;
int offset;
u32 tmp;
int i;
int cnt;

+ status = nand_page_get_status(mtd, page);
+ if (status == NAND_PAGE_STATUS_UNKNOWN) {
+ chip->cmdfunc(mtd, NAND_CMD_RNDOUT, 0, -1);
+ sunxi_nfc_read_buf(mtd, chip->buffers->databuf,
+ mtd->writesize + mtd->oobsize);
+
+ if (nand_page_is_empty(mtd)) {
+ status = NAND_PAGE_EMPTY;
+ } else {
+ status = NAND_PAGE_FILLED;
+ chip->cmdfunc(mtd, NAND_CMD_RNDOUT, 0, -1);
+ }
+
+ nand_page_set_status(mtd, page, status);
+ }
+
+ if (status == NAND_PAGE_EMPTY) {
+ memset(buf, 0xff, mtd->writesize);
+ if (oob_required)
+ memset(chip->oob_poi, 0xff, mtd->oobsize);
+ return 0;
+ }
+
tmp = readl(nfc->regs + NFC_REG_ECC_CTL);
tmp &= ~(NFC_ECC_MODE | NFC_ECC_PIPELINE | NFC_ECC_BLOCK_SIZE |
NFC_ECC_BLOCK_SIZE);
@@ -450,18 +655,31 @@ static int sunxi_nfc_hw_ecc_read_page(struct mtd_info *mtd,

offset = mtd->writesize + layout->eccpos[i * ecc->bytes] - 4;

- chip->read_buf(mtd, NULL, ecc->size);
+ nand_rnd_config(mtd, page, i * ecc->size, NAND_RND_READ);
+ nand_rnd_read_buf(mtd, NULL, ecc->size);

chip->cmdfunc(mtd, NAND_CMD_RNDOUT, offset, -1);
while ((readl(nfc->regs + NFC_REG_ST) & NFC_CMD_FIFO_STATUS))
;

+ cnt = ecc->bytes + 4;
+ if (nand_rnd_is_activ(mtd, page, offset, &cnt) > 0 &&
+ cnt == ecc->bytes + 4) {
+ tmp = readl(nfc->regs + NFC_REG_ECC_CTL);
+ tmp &= ~NFC_RANDOM_DIRECTION;
+ tmp |= NFC_RANDOM_EN;
+ writel(tmp, nfc->regs + NFC_REG_ECC_CTL);
+ }
+
tmp = NFC_DATA_TRANS | NFC_DATA_SWAP_METHOD | (1 << 30);
writel(tmp, nfc->regs + NFC_REG_CMD);
sunxi_nfc_wait_int(nfc, NFC_CMD_INT_FLAG, 0);
memcpy_fromio(buf + (i * ecc->size),
nfc->regs + NFC_RAM0_BASE, ecc->size);

+ writel(readl(nfc->regs + NFC_REG_ECC_CTL) & ~NFC_RANDOM_EN,
+ nfc->regs + NFC_REG_ECC_CTL);
+
if (readl(nfc->regs + NFC_REG_ECC_ST) & 0x1) {
mtd->ecc_stats.failed++;
} else {
@@ -475,9 +693,10 @@ static int sunxi_nfc_hw_ecc_read_page(struct mtd_info *mtd,
while ((readl(nfc->regs + NFC_REG_ST) &
NFC_CMD_FIFO_STATUS))
;
+ nand_rnd_config(mtd, -1, offset, NAND_RND_READ);
offset -= mtd->writesize;
- chip->read_buf(mtd, chip->oob_poi + offset,
- ecc->bytes + 4);
+ nand_rnd_read_buf(mtd, chip->oob_poi + offset,
+ ecc->bytes + 4);
}
}

@@ -486,10 +705,14 @@ static int sunxi_nfc_hw_ecc_read_page(struct mtd_info *mtd,
if (cnt > 0) {
chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize,
-1);
- chip->read_buf(mtd, chip->oob_poi, cnt);
+ nand_rnd_config(mtd, -1, mtd->writesize,
+ NAND_RND_READ);
+ nand_rnd_read_buf(mtd, chip->oob_poi, cnt);
}
}

+ nand_rnd_config(mtd, -1, -1, NAND_RND_READ);
+
tmp = readl(nfc->regs + NFC_REG_ECC_CTL);
tmp &= ~NFC_ECC_EN;

@@ -506,6 +729,7 @@ static int sunxi_nfc_hw_ecc_write_page(struct mtd_info *mtd,
struct nand_ecc_ctrl *ecc = chip->cur_ecc;
struct nand_ecclayout *layout = ecc->layout;
struct sunxi_nand_hw_ecc *data = ecc->priv;
+ struct sunxi_nand_hw_rnd *rnd = chip->cur_rnd->priv;
int offset;
u32 tmp;
int i;
@@ -522,7 +746,8 @@ static int sunxi_nfc_hw_ecc_write_page(struct mtd_info *mtd,
if (i)
chip->cmdfunc(mtd, NAND_CMD_RNDIN, i * ecc->size, -1);

- chip->write_buf(mtd, buf + (i * ecc->size), ecc->size);
+ nand_rnd_config(mtd, -1, i * ecc->size, NAND_RND_WRITE);
+ nand_rnd_write_buf(mtd, buf + (i * ecc->size), ecc->size);

offset = layout->eccpos[i * ecc->bytes] - 4 + mtd->writesize;

@@ -537,6 +762,16 @@ static int sunxi_nfc_hw_ecc_write_page(struct mtd_info *mtd,
4);
}

+ cnt = ecc->bytes + 4;
+ if (rnd &&
+ nand_rnd_is_activ(mtd, rnd->page, offset, &cnt) > 0 &&
+ cnt == ecc->bytes + 4) {
+ tmp = readl(nfc->regs + NFC_REG_ECC_CTL);
+ tmp &= ~NFC_RANDOM_DIRECTION;
+ tmp |= NFC_RANDOM_EN;
+ writel(tmp, nfc->regs + NFC_REG_ECC_CTL);
+ }
+
chip->cmdfunc(mtd, NAND_CMD_RNDIN, offset, -1);
while ((readl(nfc->regs + NFC_REG_ST) &
NFC_CMD_FIFO_STATUS))
@@ -546,16 +781,23 @@ static int sunxi_nfc_hw_ecc_write_page(struct mtd_info *mtd,
(1 << 30);
writel(tmp, nfc->regs + NFC_REG_CMD);
sunxi_nfc_wait_int(nfc, NFC_CMD_INT_FLAG, 0);
+
+ writel(readl(nfc->regs + NFC_REG_ECC_CTL) & ~NFC_RANDOM_EN,
+ nfc->regs + NFC_REG_ECC_CTL);
}

if (oob_required) {
cnt = ecc->layout->oobfree[0].length - 4;
if (cnt > 0) {
chip->cmdfunc(mtd, NAND_CMD_RNDIN, mtd->writesize, -1);
- chip->write_buf(mtd, chip->oob_poi, cnt);
+ nand_rnd_config(mtd, -1, mtd->writesize,
+ NAND_RND_WRITE);
+ nand_rnd_write_buf(mtd, chip->oob_poi, cnt);
}
}

+ nand_rnd_config(mtd, -1, -1, NAND_RND_WRITE);
+
tmp = readl(nfc->regs + NFC_REG_ECC_CTL);
tmp &= ~(NFC_ECC_EN | NFC_ECC_PIPELINE);

@@ -564,6 +806,34 @@ static int sunxi_nfc_hw_ecc_write_page(struct mtd_info *mtd,
return 0;
}

+static u16 sunxi_nfc_hw_ecc_rnd_steps(struct mtd_info *mtd, u16 state,
+ int column, int *left)
+{
+ struct nand_chip *chip = mtd->priv;
+ struct nand_ecc_ctrl *ecc = chip->cur_ecc;
+ struct sunxi_nand_hw_rnd *rnd = chip->cur_rnd->priv;
+ int modsize = ecc->size;
+ int steps;
+
+ if (column < mtd->writesize) {
+ steps = column % modsize;
+ *left = modsize - steps;
+ } else if (column < (mtd->writesize +
+ ecc->layout->oobfree[0].length - 4)) {
+ steps = column % 4096;
+ column -= mtd->writesize;
+ *left = ecc->layout->oobfree[0].length - 4 - column;
+ } else {
+ column -= (mtd->writesize +
+ ecc->layout->oobfree[0].length - 4);
+ steps = column % (ecc->bytes + ecc->prepad);
+ *left = ecc->bytes + ecc->prepad - steps;
+ state = rnd->subseeds[rnd->page % rnd->nseeds];
+ }
+
+ return sunxi_nfc_hwrnd_step(rnd, state, steps);
+}
+
static int sunxi_nfc_hw_syndrome_ecc_read_page(struct mtd_info *mtd,
struct nand_chip *chip,
uint8_t *buf, int oob_required,
@@ -576,10 +846,34 @@ static int sunxi_nfc_hw_syndrome_ecc_read_page(struct mtd_info *mtd,
unsigned int max_bitflips = 0;
uint8_t *oob = chip->oob_poi;
int offset = 0;
+ int status;
int cnt;
u32 tmp;
int i;

+ status = nand_page_get_status(mtd, page);
+ if (status == NAND_PAGE_STATUS_UNKNOWN) {
+ chip->cmdfunc(mtd, NAND_CMD_RNDOUT, 0, -1);
+ sunxi_nfc_read_buf(mtd, chip->buffers->databuf,
+ mtd->writesize + mtd->oobsize);
+
+ if (nand_page_is_empty(mtd)) {
+ status = NAND_PAGE_EMPTY;
+ } else {
+ status = NAND_PAGE_FILLED;
+ chip->cmdfunc(mtd, NAND_CMD_RNDOUT, 0, -1);
+ }
+
+ nand_page_set_status(mtd, page, status);
+ }
+
+ if (status == NAND_PAGE_EMPTY) {
+ memset(buf, 0xff, mtd->writesize);
+ if (oob_required)
+ memset(chip->oob_poi, 0xff, mtd->oobsize);
+ return 0;
+ }
+
tmp = readl(nfc->regs + NFC_REG_ECC_CTL);
tmp &= ~(NFC_ECC_MODE | NFC_ECC_PIPELINE | NFC_ECC_BLOCK_SIZE |
NFC_ECC_BLOCK_SIZE);
@@ -588,7 +882,17 @@ static int sunxi_nfc_hw_syndrome_ecc_read_page(struct mtd_info *mtd,
writel(tmp, nfc->regs + NFC_REG_ECC_CTL);

for (i = 0; i < steps; i++) {
- chip->read_buf(mtd, NULL, ecc->size);
+ nand_rnd_config(mtd, page, offset, NAND_RND_READ);
+ nand_rnd_read_buf(mtd, NULL, ecc->size);
+
+ cnt = ecc->bytes + 4;
+ if (nand_rnd_is_activ(mtd, page, offset, &cnt) > 0 &&
+ cnt == ecc->bytes + 4) {
+ tmp = readl(nfc->regs + NFC_REG_ECC_CTL);
+ tmp &= ~NFC_RANDOM_DIRECTION;
+ tmp |= NFC_RANDOM_EN;
+ writel(tmp, nfc->regs + NFC_REG_ECC_CTL);
+ }

tmp = NFC_DATA_TRANS | NFC_DATA_SWAP_METHOD | (1 << 30);
writel(tmp, nfc->regs + NFC_REG_CMD);
@@ -597,6 +901,9 @@ static int sunxi_nfc_hw_syndrome_ecc_read_page(struct mtd_info *mtd,
buf += ecc->size;
offset += ecc->size;

+ writel(readl(nfc->regs + NFC_REG_ECC_CTL) & ~NFC_RANDOM_EN,
+ nfc->regs + NFC_REG_ECC_CTL);
+
if (readl(nfc->regs + NFC_REG_ECC_ST) & 0x1) {
mtd->ecc_stats.failed++;
} else {
@@ -607,7 +914,8 @@ static int sunxi_nfc_hw_syndrome_ecc_read_page(struct mtd_info *mtd,

if (oob_required) {
chip->cmdfunc(mtd, NAND_CMD_RNDOUT, offset, -1);
- chip->read_buf(mtd, oob, ecc->bytes + ecc->prepad);
+ nand_rnd_config(mtd, -1, offset, NAND_RND_READ);
+ nand_rnd_read_buf(mtd, oob, ecc->bytes + ecc->prepad);
oob += ecc->bytes + ecc->prepad;
}

@@ -618,10 +926,13 @@ static int sunxi_nfc_hw_syndrome_ecc_read_page(struct mtd_info *mtd,
cnt = mtd->oobsize - (oob - chip->oob_poi);
if (cnt > 0) {
chip->cmdfunc(mtd, NAND_CMD_RNDOUT, offset, -1);
- chip->read_buf(mtd, oob, cnt);
+ nand_rnd_config(mtd, page, offset, NAND_RND_READ);
+ nand_rnd_read_buf(mtd, oob, cnt);
}
}

+ nand_rnd_config(mtd, -1, -1, NAND_RND_READ);
+
writel(readl(nfc->regs + NFC_REG_ECC_CTL) & ~NFC_ECC_EN,
nfc->regs + NFC_REG_ECC_CTL);

@@ -636,6 +947,7 @@ static int sunxi_nfc_hw_syndrome_ecc_write_page(struct mtd_info *mtd,
struct sunxi_nfc *nfc = to_sunxi_nfc(chip->controller);
struct nand_ecc_ctrl *ecc = chip->cur_ecc;
struct sunxi_nand_hw_ecc *data = ecc->priv;
+ struct sunxi_nand_hw_rnd *rnd = chip->cur_rnd->priv;
int steps = mtd->writesize / ecc->size;
uint8_t *oob = chip->oob_poi;
int offset = 0;
@@ -651,7 +963,8 @@ static int sunxi_nfc_hw_syndrome_ecc_write_page(struct mtd_info *mtd,
writel(tmp, nfc->regs + NFC_REG_ECC_CTL);

for (i = 0; i < steps; i++) {
- chip->write_buf(mtd, buf + (i * ecc->size), ecc->size);
+ nand_rnd_config(mtd, -1, offset, NAND_RND_WRITE);
+ nand_rnd_write_buf(mtd, buf + (i * ecc->size), ecc->size);
offset += ecc->size;

/* Fill OOB data in */
@@ -664,11 +977,24 @@ static int sunxi_nfc_hw_syndrome_ecc_write_page(struct mtd_info *mtd,
4);
}

+ cnt = ecc->bytes + 4;
+ if (rnd &&
+ nand_rnd_is_activ(mtd, rnd->page, offset, &cnt) > 0 &&
+ cnt == ecc->bytes + 4) {
+ tmp = readl(nfc->regs + NFC_REG_ECC_CTL);
+ tmp &= ~NFC_RANDOM_DIRECTION;
+ tmp |= NFC_RANDOM_EN;
+ writel(tmp, nfc->regs + NFC_REG_ECC_CTL);
+ }
+
tmp = NFC_DATA_TRANS | NFC_DATA_SWAP_METHOD | NFC_ACCESS_DIR |
(1 << 30);
writel(tmp, nfc->regs + NFC_REG_CMD);
sunxi_nfc_wait_int(nfc, NFC_CMD_INT_FLAG, 0);

+ writel(readl(nfc->regs + NFC_REG_ECC_CTL) & ~NFC_RANDOM_EN,
+ nfc->regs + NFC_REG_ECC_CTL);
+
offset += ecc->bytes + ecc->prepad;
oob += ecc->bytes + ecc->prepad;
}
@@ -677,9 +1003,11 @@ static int sunxi_nfc_hw_syndrome_ecc_write_page(struct mtd_info *mtd,
cnt = mtd->oobsize - (oob - chip->oob_poi);
if (cnt > 0) {
chip->cmdfunc(mtd, NAND_CMD_RNDIN, offset, -1);
- chip->write_buf(mtd, oob, cnt);
+ nand_rnd_config(mtd, -1, offset, NAND_RND_WRITE);
+ nand_rnd_write_buf(mtd, oob, cnt);
}
}
+ nand_rnd_config(mtd, -1, -1, NAND_RND_WRITE);

tmp = readl(nfc->regs + NFC_REG_ECC_CTL);
tmp &= ~(NFC_ECC_EN | NFC_ECC_PIPELINE);
@@ -689,6 +1017,123 @@ static int sunxi_nfc_hw_syndrome_ecc_write_page(struct mtd_info *mtd,
return 0;
}

+static u16 sunxi_nfc_hw_syndrome_ecc_rnd_steps(struct mtd_info *mtd, u16 state,
+ int column, int *left)
+{
+ struct nand_chip *chip = mtd->priv;
+ struct nand_ecc_ctrl *ecc = chip->cur_ecc;
+ struct sunxi_nand_hw_rnd *rnd = chip->cur_rnd->priv;
+ int eccsteps = mtd->writesize / ecc->size;
+ int modsize = ecc->size + ecc->prepad + ecc->bytes;
+ int steps;
+
+ if (column < (eccsteps * modsize)) {
+ steps = column % modsize;
+ *left = modsize - steps;
+ if (steps >= ecc->size) {
+ steps -= ecc->size;
+ state = rnd->subseeds[rnd->page % rnd->nseeds];
+ }
+ } else {
+ steps = column % 4096;
+ *left = mtd->writesize + mtd->oobsize - column;
+ }
+
+ return sunxi_nfc_hwrnd_step(rnd, state, steps);
+}
+
+static u16 default_seeds[] = {0x4a80};
+
+static void sunxi_nand_rnd_ctrl_cleanup(struct nand_rnd_ctrl *rnd)
+{
+ struct sunxi_nand_hw_rnd *hwrnd = rnd->priv;
+
+ if (hwrnd->seeds != default_seeds)
+ kfree(hwrnd->seeds);
+ kfree(hwrnd->subseeds);
+ kfree(rnd->layout);
+ kfree(hwrnd);
+}
+
+static int sunxi_nand_rnd_ctrl_init(struct mtd_info *mtd,
+ struct nand_rnd_ctrl *rnd,
+ struct nand_ecc_ctrl *ecc,
+ struct device_node *np)
+{
+ struct sunxi_nand_hw_rnd *hwrnd;
+ struct nand_rnd_layout *layout = NULL;
+ int ret;
+
+ hwrnd = kzalloc(sizeof(*hwrnd), GFP_KERNEL);
+ if (!hwrnd)
+ return -ENOMEM;
+
+ hwrnd->seeds = default_seeds;
+ hwrnd->nseeds = ARRAY_SIZE(default_seeds);
+
+ if (of_get_property(np, "nand-randomizer-seeds", &ret)) {
+ hwrnd->nseeds = ret / sizeof(*hwrnd->seeds);
+ hwrnd->seeds = kzalloc(hwrnd->nseeds * sizeof(*hwrnd->seeds),
+ GFP_KERNEL);
+ if (!hwrnd->seeds) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ ret = of_property_read_u16_array(np, "nand-randomizer-seeds",
+ hwrnd->seeds, hwrnd->nseeds);
+ if (ret)
+ goto err;
+ }
+
+ if (ecc->mode == NAND_ECC_HW_SYNDROME) {
+ hwrnd->step = sunxi_nfc_hw_syndrome_ecc_rnd_steps;
+ } else {
+ layout = kzalloc(sizeof(*layout) + sizeof(struct nand_rndfree),
+ GFP_KERNEL);
+ if (!layout) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ layout->nranges = 1;
+ layout->ranges[0].offset = mtd->writesize;
+ layout->ranges[0].length = 2;
+ rnd->layout = layout;
+ if (ecc->mode == NAND_ECC_HW)
+ hwrnd->step = sunxi_nfc_hw_ecc_rnd_steps;
+ }
+
+ if (ecc->mode == NAND_ECC_HW_SYNDROME || ecc->mode == NAND_ECC_HW) {
+ int i;
+
+ hwrnd->subseeds = kzalloc(hwrnd->nseeds *
+ sizeof(*hwrnd->subseeds),
+ GFP_KERNEL);
+ if (!hwrnd->subseeds) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ for (i = 0; i < hwrnd->nseeds; i++)
+ hwrnd->subseeds[i] = sunxi_nfc_hwrnd_step(hwrnd,
+ hwrnd->seeds[i],
+ ecc->size);
+ }
+
+ rnd->config = sunxi_nfc_hwrnd_config;
+ rnd->read_buf = sunxi_nfc_hwrnd_read_buf;
+ rnd->write_buf = sunxi_nfc_hwrnd_write_buf;
+ rnd->priv = hwrnd;
+
+ return 0;
+
+err:
+ kfree(hwrnd);
+ kfree(layout);
+
+ return ret;
+}
+
static int sunxi_nand_chip_set_timings(struct sunxi_nand_chip *chip,
const struct nand_sdr_timings *timings)
{
@@ -962,6 +1407,34 @@ static int sunxi_nand_hw_syndrome_ecc_ctrl_init(struct mtd_info *mtd,
return 0;
}

+static void sunxi_nand_rnd_cleanup(struct nand_rnd_ctrl *rnd)
+{
+ switch (rnd->mode) {
+ case NAND_RND_HW:
+ sunxi_nand_rnd_ctrl_cleanup(rnd);
+ break;
+ default:
+ break;
+ }
+}
+
+static int sunxi_nand_rnd_init(struct mtd_info *mtd,
+ struct nand_rnd_ctrl *rnd,
+ struct nand_ecc_ctrl *ecc,
+ struct device_node *np)
+{
+ rnd->mode = of_get_nand_rnd_mode(np);
+
+ switch (rnd->mode) {
+ case NAND_RND_HW:
+ return sunxi_nand_rnd_ctrl_init(mtd, rnd, ecc, np);
+ default:
+ break;
+ }
+
+ return 0;
+}
+
static void sunxi_nand_ecc_cleanup(struct nand_ecc_ctrl *ecc)
{
switch (ecc->mode) {
@@ -1041,7 +1514,14 @@ struct nand_part *sunxi_ofnandpart_parse(void *priv, struct mtd_info *master,
if (ret)
goto err;

+ ret = sunxi_nand_rnd_init(master, &part->rnd, &part->ecc, pp);
+ if (ret) {
+ sunxi_nand_ecc_cleanup(&part->ecc);
+ goto err;
+ }
+
part->part.ecc = &part->ecc;
+ part->part.rnd = &part->rnd;

return &part->part;

@@ -1146,10 +1626,18 @@ static int sunxi_nand_chip_init(struct device *dev, struct sunxi_nfc *nfc,
if (ret)
return ret;

+ ret = nand_pst_create(mtd);
+ if (ret)
+ return ret;
+
ret = sunxi_nand_ecc_init(mtd, &nand->ecc, np);
if (ret)
return ret;

+ ret = sunxi_nand_rnd_init(mtd, &nand->rnd, &nand->ecc, np);
+ if (ret)
+ return ret;
+
ret = nand_scan_tail(mtd);
if (ret)
return ret;
@@ -1204,6 +1692,7 @@ static void sunxi_nand_chips_cleanup(struct sunxi_nfc *nfc)
node);
nand_release(&chip->mtd);
sunxi_nand_ecc_cleanup(&chip->nand.ecc);
+ sunxi_nand_rnd_cleanup(&chip->nand.rnd);
}
}

--
1.8.3.2

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