mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 12:28:41 +08:00
mtd: nand: hynix: Add read-retry support for 1x nm MLC NANDs
All Hynix MLC NANDs produced with the 1x nm process support read-retry. This read retry implementation should also be re-usable for other Hynix NANDs, but the method to retrieve the read-retry parameters from the read-retry OTP area might change a bit (some NANDs are even using a fixed set of values instead of retrieving those information from the OTP area). Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> Acked-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Boris Brezillon
parent
78f3482d74
commit
626994e074
@ -17,6 +17,53 @@
|
||||
|
||||
#include <linux/mtd/nand.h>
|
||||
#include <linux/sizes.h>
|
||||
#include <linux/slab.h>
|
||||
|
||||
#define NAND_HYNIX_CMD_SET_PARAMS 0x36
|
||||
#define NAND_HYNIX_CMD_APPLY_PARAMS 0x16
|
||||
|
||||
#define NAND_HYNIX_1XNM_RR_REPEAT 8
|
||||
|
||||
/**
|
||||
* struct hynix_read_retry - read-retry data
|
||||
* @nregs: number of register to set when applying a new read-retry mode
|
||||
* @regs: register offsets (NAND chip dependent)
|
||||
* @values: array of values to set in registers. The array size is equal to
|
||||
* (nregs * nmodes)
|
||||
*/
|
||||
struct hynix_read_retry {
|
||||
int nregs;
|
||||
const u8 *regs;
|
||||
u8 values[0];
|
||||
};
|
||||
|
||||
/**
|
||||
* struct hynix_nand - private Hynix NAND struct
|
||||
* @nand_technology: manufacturing process expressed in picometer
|
||||
* @read_retry: read-retry information
|
||||
*/
|
||||
struct hynix_nand {
|
||||
const struct hynix_read_retry *read_retry;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct hynix_read_retry_otp - structure describing how the read-retry OTP
|
||||
* area
|
||||
* @nregs: number of hynix private registers to set before reading the reading
|
||||
* the OTP area
|
||||
* @regs: registers that should be configured
|
||||
* @values: values that should be set in regs
|
||||
* @page: the address to pass to the READ_PAGE command. Depends on the NAND
|
||||
* chip
|
||||
* @size: size of the read-retry OTP section
|
||||
*/
|
||||
struct hynix_read_retry_otp {
|
||||
int nregs;
|
||||
const u8 *regs;
|
||||
const u8 *values;
|
||||
int page;
|
||||
int size;
|
||||
};
|
||||
|
||||
static bool hynix_nand_has_valid_jedecid(struct nand_chip *chip)
|
||||
{
|
||||
@ -31,6 +78,288 @@ static bool hynix_nand_has_valid_jedecid(struct nand_chip *chip)
|
||||
return !strcmp("JEDEC", jedecid);
|
||||
}
|
||||
|
||||
static int hynix_nand_setup_read_retry(struct mtd_info *mtd, int retry_mode)
|
||||
{
|
||||
struct nand_chip *chip = mtd_to_nand(mtd);
|
||||
struct hynix_nand *hynix = nand_get_manufacturer_data(chip);
|
||||
const u8 *values;
|
||||
int status;
|
||||
int i;
|
||||
|
||||
values = hynix->read_retry->values +
|
||||
(retry_mode * hynix->read_retry->nregs);
|
||||
|
||||
/* Enter 'Set Hynix Parameters' mode */
|
||||
chip->cmdfunc(mtd, NAND_HYNIX_CMD_SET_PARAMS, -1, -1);
|
||||
|
||||
/*
|
||||
* Configure the NAND in the requested read-retry mode.
|
||||
* This is done by setting pre-defined values in internal NAND
|
||||
* registers.
|
||||
*
|
||||
* The set of registers is NAND specific, and the values are either
|
||||
* predefined or extracted from an OTP area on the NAND (values are
|
||||
* probably tweaked at production in this case).
|
||||
*/
|
||||
for (i = 0; i < hynix->read_retry->nregs; i++) {
|
||||
int column = hynix->read_retry->regs[i];
|
||||
|
||||
column |= column << 8;
|
||||
chip->cmdfunc(mtd, NAND_CMD_NONE, column, -1);
|
||||
chip->write_byte(mtd, values[i]);
|
||||
}
|
||||
|
||||
/* Apply the new settings. */
|
||||
chip->cmdfunc(mtd, NAND_HYNIX_CMD_APPLY_PARAMS, -1, -1);
|
||||
|
||||
status = chip->waitfunc(mtd, chip);
|
||||
if (status & NAND_STATUS_FAIL)
|
||||
return -EIO;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* hynix_get_majority - get the value that is occurring the most in a given
|
||||
* set of values
|
||||
* @in: the array of values to test
|
||||
* @repeat: the size of the in array
|
||||
* @out: pointer used to store the output value
|
||||
*
|
||||
* This function implements the 'majority check' logic that is supposed to
|
||||
* overcome the unreliability of MLC NANDs when reading the OTP area storing
|
||||
* the read-retry parameters.
|
||||
*
|
||||
* It's based on a pretty simple assumption: if we repeat the same value
|
||||
* several times and then take the one that is occurring the most, we should
|
||||
* find the correct value.
|
||||
* Let's hope this dummy algorithm prevents us from losing the read-retry
|
||||
* parameters.
|
||||
*/
|
||||
static int hynix_get_majority(const u8 *in, int repeat, u8 *out)
|
||||
{
|
||||
int i, j, half = repeat / 2;
|
||||
|
||||
/*
|
||||
* We only test the first half of the in array because we must ensure
|
||||
* that the value is at least occurring repeat / 2 times.
|
||||
*
|
||||
* This loop is suboptimal since we may count the occurrences of the
|
||||
* same value several time, but we are doing that on small sets, which
|
||||
* makes it acceptable.
|
||||
*/
|
||||
for (i = 0; i < half; i++) {
|
||||
int cnt = 0;
|
||||
u8 val = in[i];
|
||||
|
||||
/* Count all values that are matching the one at index i. */
|
||||
for (j = i + 1; j < repeat; j++) {
|
||||
if (in[j] == val)
|
||||
cnt++;
|
||||
}
|
||||
|
||||
/* We found a value occurring more than repeat / 2. */
|
||||
if (cnt > half) {
|
||||
*out = val;
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
static int hynix_read_rr_otp(struct nand_chip *chip,
|
||||
const struct hynix_read_retry_otp *info,
|
||||
void *buf)
|
||||
{
|
||||
struct mtd_info *mtd = nand_to_mtd(chip);
|
||||
int i;
|
||||
|
||||
chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
|
||||
|
||||
chip->cmdfunc(mtd, NAND_HYNIX_CMD_SET_PARAMS, -1, -1);
|
||||
|
||||
for (i = 0; i < info->nregs; i++) {
|
||||
int column = info->regs[i];
|
||||
|
||||
column |= column << 8;
|
||||
chip->cmdfunc(mtd, NAND_CMD_NONE, column, -1);
|
||||
chip->write_byte(mtd, info->values[i]);
|
||||
}
|
||||
|
||||
chip->cmdfunc(mtd, NAND_HYNIX_CMD_APPLY_PARAMS, -1, -1);
|
||||
|
||||
/* Sequence to enter OTP mode? */
|
||||
chip->cmdfunc(mtd, 0x17, -1, -1);
|
||||
chip->cmdfunc(mtd, 0x04, -1, -1);
|
||||
chip->cmdfunc(mtd, 0x19, -1, -1);
|
||||
|
||||
/* Now read the page */
|
||||
chip->cmdfunc(mtd, NAND_CMD_READ0, 0x0, info->page);
|
||||
chip->read_buf(mtd, buf, info->size);
|
||||
|
||||
/* Put everything back to normal */
|
||||
chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
|
||||
chip->cmdfunc(mtd, NAND_HYNIX_CMD_SET_PARAMS, 0x38, -1);
|
||||
chip->write_byte(mtd, 0x0);
|
||||
chip->cmdfunc(mtd, NAND_HYNIX_CMD_APPLY_PARAMS, -1, -1);
|
||||
chip->cmdfunc(mtd, NAND_CMD_READ0, 0x0, -1);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#define NAND_HYNIX_1XNM_RR_COUNT_OFFS 0
|
||||
#define NAND_HYNIX_1XNM_RR_REG_COUNT_OFFS 8
|
||||
#define NAND_HYNIX_1XNM_RR_SET_OFFS(x, setsize, inv) \
|
||||
(16 + ((((x) * 2) + ((inv) ? 1 : 0)) * (setsize)))
|
||||
|
||||
static int hynix_mlc_1xnm_rr_value(const u8 *buf, int nmodes, int nregs,
|
||||
int mode, int reg, bool inv, u8 *val)
|
||||
{
|
||||
u8 tmp[NAND_HYNIX_1XNM_RR_REPEAT];
|
||||
int val_offs = (mode * nregs) + reg;
|
||||
int set_size = nmodes * nregs;
|
||||
int i, ret;
|
||||
|
||||
for (i = 0; i < NAND_HYNIX_1XNM_RR_REPEAT; i++) {
|
||||
int set_offs = NAND_HYNIX_1XNM_RR_SET_OFFS(i, set_size, inv);
|
||||
|
||||
tmp[i] = buf[val_offs + set_offs];
|
||||
}
|
||||
|
||||
ret = hynix_get_majority(tmp, NAND_HYNIX_1XNM_RR_REPEAT, val);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (inv)
|
||||
*val = ~*val;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static u8 hynix_1xnm_mlc_read_retry_regs[] = {
|
||||
0xcc, 0xbf, 0xaa, 0xab, 0xcd, 0xad, 0xae, 0xaf
|
||||
};
|
||||
|
||||
static int hynix_mlc_1xnm_rr_init(struct nand_chip *chip,
|
||||
const struct hynix_read_retry_otp *info)
|
||||
{
|
||||
struct hynix_nand *hynix = nand_get_manufacturer_data(chip);
|
||||
struct hynix_read_retry *rr = NULL;
|
||||
int ret, i, j;
|
||||
u8 nregs, nmodes;
|
||||
u8 *buf;
|
||||
|
||||
buf = kmalloc(info->size, GFP_KERNEL);
|
||||
if (!buf)
|
||||
return -ENOMEM;
|
||||
|
||||
ret = hynix_read_rr_otp(chip, info, buf);
|
||||
if (ret)
|
||||
goto out;
|
||||
|
||||
ret = hynix_get_majority(buf, NAND_HYNIX_1XNM_RR_REPEAT,
|
||||
&nmodes);
|
||||
if (ret)
|
||||
goto out;
|
||||
|
||||
ret = hynix_get_majority(buf + NAND_HYNIX_1XNM_RR_REPEAT,
|
||||
NAND_HYNIX_1XNM_RR_REPEAT,
|
||||
&nregs);
|
||||
if (ret)
|
||||
goto out;
|
||||
|
||||
rr = kzalloc(sizeof(*rr) + (nregs * nmodes), GFP_KERNEL);
|
||||
if (!rr)
|
||||
goto out;
|
||||
|
||||
for (i = 0; i < nmodes; i++) {
|
||||
for (j = 0; j < nregs; j++) {
|
||||
u8 *val = rr->values + (i * nregs);
|
||||
|
||||
ret = hynix_mlc_1xnm_rr_value(buf, nmodes, nregs, i, j,
|
||||
false, val);
|
||||
if (!ret)
|
||||
continue;
|
||||
|
||||
ret = hynix_mlc_1xnm_rr_value(buf, nmodes, nregs, i, j,
|
||||
true, val);
|
||||
if (ret)
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
|
||||
rr->nregs = nregs;
|
||||
rr->regs = hynix_1xnm_mlc_read_retry_regs;
|
||||
hynix->read_retry = rr;
|
||||
chip->setup_read_retry = hynix_nand_setup_read_retry;
|
||||
chip->read_retries = nmodes;
|
||||
|
||||
out:
|
||||
kfree(buf);
|
||||
|
||||
if (ret)
|
||||
kfree(rr);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const u8 hynix_mlc_1xnm_rr_otp_regs[] = { 0x38 };
|
||||
static const u8 hynix_mlc_1xnm_rr_otp_values[] = { 0x52 };
|
||||
|
||||
static const struct hynix_read_retry_otp hynix_mlc_1xnm_rr_otps[] = {
|
||||
{
|
||||
.nregs = ARRAY_SIZE(hynix_mlc_1xnm_rr_otp_regs),
|
||||
.regs = hynix_mlc_1xnm_rr_otp_regs,
|
||||
.values = hynix_mlc_1xnm_rr_otp_values,
|
||||
.page = 0x21f,
|
||||
.size = 784
|
||||
},
|
||||
{
|
||||
.nregs = ARRAY_SIZE(hynix_mlc_1xnm_rr_otp_regs),
|
||||
.regs = hynix_mlc_1xnm_rr_otp_regs,
|
||||
.values = hynix_mlc_1xnm_rr_otp_values,
|
||||
.page = 0x200,
|
||||
.size = 528,
|
||||
},
|
||||
};
|
||||
|
||||
static int hynix_nand_rr_init(struct nand_chip *chip)
|
||||
{
|
||||
int i, ret = 0;
|
||||
bool valid_jedecid;
|
||||
|
||||
valid_jedecid = hynix_nand_has_valid_jedecid(chip);
|
||||
|
||||
/*
|
||||
* We only support read-retry for 1xnm NANDs, and those NANDs all
|
||||
* expose a valid JEDEC ID.
|
||||
*/
|
||||
if (valid_jedecid) {
|
||||
u8 nand_tech = chip->id.data[5] >> 4;
|
||||
|
||||
/* 1xnm technology */
|
||||
if (nand_tech == 4) {
|
||||
for (i = 0; i < ARRAY_SIZE(hynix_mlc_1xnm_rr_otps);
|
||||
i++) {
|
||||
/*
|
||||
* FIXME: Hynix recommend to copy the
|
||||
* read-retry OTP area into a normal page.
|
||||
*/
|
||||
ret = hynix_mlc_1xnm_rr_init(chip,
|
||||
hynix_mlc_1xnm_rr_otps);
|
||||
if (!ret)
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (ret)
|
||||
pr_warn("failed to initialize read-retry infrastructure");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void hynix_nand_extract_oobsize(struct nand_chip *chip,
|
||||
bool valid_jedecid)
|
||||
{
|
||||
@ -258,17 +587,43 @@ static void hynix_nand_decode_id(struct nand_chip *chip)
|
||||
hynix_nand_extract_scrambling_requirements(chip, valid_jedecid);
|
||||
}
|
||||
|
||||
static void hynix_nand_cleanup(struct nand_chip *chip)
|
||||
{
|
||||
struct hynix_nand *hynix = nand_get_manufacturer_data(chip);
|
||||
|
||||
if (!hynix)
|
||||
return;
|
||||
|
||||
kfree(hynix->read_retry);
|
||||
kfree(hynix);
|
||||
nand_set_manufacturer_data(chip, NULL);
|
||||
}
|
||||
|
||||
static int hynix_nand_init(struct nand_chip *chip)
|
||||
{
|
||||
struct hynix_nand *hynix;
|
||||
int ret;
|
||||
|
||||
if (!nand_is_slc(chip))
|
||||
chip->bbt_options |= NAND_BBT_SCANLASTPAGE;
|
||||
else
|
||||
chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
|
||||
|
||||
return 0;
|
||||
hynix = kzalloc(sizeof(*hynix), GFP_KERNEL);
|
||||
if (!hynix)
|
||||
return -ENOMEM;
|
||||
|
||||
nand_set_manufacturer_data(chip, hynix);
|
||||
|
||||
ret = hynix_nand_rr_init(chip);
|
||||
if (ret)
|
||||
hynix_nand_cleanup(chip);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
const struct nand_manufacturer_ops hynix_nand_manuf_ops = {
|
||||
.detect = hynix_nand_decode_id,
|
||||
.init = hynix_nand_init,
|
||||
.cleanup = hynix_nand_cleanup,
|
||||
};
|
||||
|
||||
Loading…
Reference in New Issue
Block a user