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mtd: nand: sunxi: switch from manual to automated timing config 

The NAND framework is now able to select the best NAND timings for us.
All we have to do is implement a ->setup_data_interface() function to
apply those timings and remove the timing selection code from the sunxi
driver.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Sascha Hauer 2016-09-15 10:32:51 +02:00 committed by Boris Brezillon
parent d8e725dd83
commit 907f45fb99
1 changed files with 14 additions and 62 deletions
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76
drivers/mtd/nand/sunxi_nand.c
View File

@ -1572,14 +1572,22 @@ static int _sunxi_nand_lookup_timing(const s32 *lut, int lut_size, u32 duration,
#define sunxi_nand_lookup_timing(l, p, c) \
_sunxi_nand_lookup_timing(l, ARRAY_SIZE(l), p, c)
static int sunxi_nand_chip_set_timings(struct sunxi_nand_chip *chip,
const struct nand_sdr_timings *timings)
static int sunxi_nfc_setup_data_interface(struct mtd_info *mtd,
const struct nand_data_interface *conf,
bool check_only)
{
struct nand_chip *nand = mtd_to_nand(mtd);
struct sunxi_nand_chip *chip = to_sunxi_nand(nand);
struct sunxi_nfc *nfc = to_sunxi_nfc(chip->nand.controller);
const struct nand_sdr_timings *timings;
u32 min_clk_period = 0;
s32 tWB, tADL, tWHR, tRHW, tCAD;
long real_clk_rate;
timings = nand_get_sdr_timings(conf);
if (IS_ERR(timings))
return -ENOTSUPP;
/* T1 <=> tCLS */
if (timings->tCLS_min > min_clk_period)
min_clk_period = timings->tCLS_min;
@ -1679,6 +1687,9 @@ static int sunxi_nand_chip_set_timings(struct sunxi_nand_chip *chip,
return tRHW;
}
if (check_only)
return 0;
/*
* TODO: according to ONFI specs this value only applies for DDR NAND,
* but Allwinner seems to set this to 0x7. Mimic them for now.
@ -1712,44 +1723,6 @@ static int sunxi_nand_chip_set_timings(struct sunxi_nand_chip *chip,
return 0;
}
static int sunxi_nand_chip_init_timings(struct sunxi_nand_chip *chip,
struct device_node *np)
{
struct mtd_info *mtd = nand_to_mtd(&chip->nand);
const struct nand_sdr_timings *timings;
int ret;
int mode;
mode = onfi_get_async_timing_mode(&chip->nand);
if (mode == ONFI_TIMING_MODE_UNKNOWN) {
mode = chip->nand.onfi_timing_mode_default;
} else {
uint8_t feature[ONFI_SUBFEATURE_PARAM_LEN] = {};
int i;
mode = fls(mode) - 1;
if (mode < 0)
mode = 0;
feature[0] = mode;
for (i = 0; i < chip->nsels; i++) {
chip->nand.select_chip(mtd, i);
ret = chip->nand.onfi_set_features(mtd, &chip->nand,
ONFI_FEATURE_ADDR_TIMING_MODE,
feature);
chip->nand.select_chip(mtd, -1);
if (ret)
return ret;
}
}
timings = onfi_async_timing_mode_to_sdr_timings(mode);
if (IS_ERR(timings))
return PTR_ERR(timings);
return sunxi_nand_chip_set_timings(chip, timings);
}
static int sunxi_nand_ooblayout_ecc(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
@ -1975,7 +1948,6 @@ static int sunxi_nand_ecc_init(struct mtd_info *mtd, struct nand_ecc_ctrl *ecc,
static int sunxi_nand_chip_init(struct device *dev, struct sunxi_nfc *nfc,
struct device_node *np)
{
const struct nand_sdr_timings *timings;
struct sunxi_nand_chip *chip;
struct mtd_info *mtd;
struct nand_chip *nand;
@ -2065,25 +2037,11 @@ static int sunxi_nand_chip_init(struct device *dev, struct sunxi_nfc *nfc,
nand->read_buf = sunxi_nfc_read_buf;
nand->write_buf = sunxi_nfc_write_buf;
nand->read_byte = sunxi_nfc_read_byte;
nand->setup_data_interface = sunxi_nfc_setup_data_interface;
mtd = nand_to_mtd(nand);
mtd->dev.parent = dev;
timings = onfi_async_timing_mode_to_sdr_timings(0);
if (IS_ERR(timings)) {
ret = PTR_ERR(timings);
dev_err(dev,
"could not retrieve timings for ONFI mode 0: %d\n",
ret);
return ret;
}
ret = sunxi_nand_chip_set_timings(chip, timings);
if (ret) {
dev_err(dev, "could not configure chip timings: %d\n", ret);
return ret;
}
ret = nand_scan_ident(mtd, nsels, NULL);
if (ret)
return ret;
@ -2096,12 +2054,6 @@ static int sunxi_nand_chip_init(struct device *dev, struct sunxi_nfc *nfc,
nand->options |= NAND_SUBPAGE_READ;
ret = sunxi_nand_chip_init_timings(chip, np);
if (ret) {
dev_err(dev, "could not configure chip timings: %d\n", ret);
return ret;
}
ret = sunxi_nand_ecc_init(mtd, &nand->ecc, np);
if (ret) {
dev_err(dev, "ECC init failed: %d\n", ret);