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mtd: nand: add ->setup_data_interface() support for Marvell NFCv1

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First generation of Marvell NAND flash controllers (eg. embedded in PXA
boards) did not make use of the NAND core hook ->setup_data_interface()
to setup controller timings. Add support for it.

Signed-off-by: Miquel Raynal <miquel.raynal@free-electrons.com>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
This commit is contained in:
Miquel Raynal 2018-01-17 00:19:34 +01:00 committed by Boris Brezillon
parent 68dc8e41fd
commit 07ad5a7214
1 changed files with 29 additions and 10 deletions
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39
drivers/mtd/nand/marvell_nand.c
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@ -379,6 +379,8 @@ struct marvell_nfc_timings {
* return the number of clock periods.
*/
#define TO_CYCLES(ps, period_ns) (DIV_ROUND_UP(ps / 1000, period_ns))
#define TO_CYCLES64(ps, period_ns) (DIV_ROUND_UP_ULL(div_u64(ps, 1000), \
period_ns))
/**
* NAND driver structure filled during the parsing of the ->exec_op() subop
@ -2236,8 +2238,20 @@ static int marvell_nfc_setup_data_interface(struct mtd_info *mtd, int chipnr,
nfc_tmg.tRHW = TO_CYCLES(max_t(int, sdr->tRHW_min, sdr->tCCS_min),
period_ns);
/* Use WAIT_MODE (wait for RB line) instead of only relying on delays */
nfc_tmg.tR = TO_CYCLES(sdr->tWB_max, period_ns);
/*
* NFCv2: Use WAIT_MODE (wait for RB line), do not rely only on delays.
* NFCv1: No WAIT_MODE, tR must be maximal.
*/
if (nfc->caps->is_nfcv2) {
nfc_tmg.tR = TO_CYCLES(sdr->tWB_max, period_ns);
} else {
nfc_tmg.tR = TO_CYCLES64(sdr->tWB_max + sdr->tR_max,
period_ns);
if (nfc_tmg.tR + 3 > nfc_tmg.tCH)
nfc_tmg.tR = nfc_tmg.tCH - 3;
else
nfc_tmg.tR = 0;
}
if (chipnr < 0)
return 0;
@ -2249,18 +2263,24 @@ static int marvell_nfc_setup_data_interface(struct mtd_info *mtd, int chipnr,
NDTR0_TWP(nfc_tmg.tWP) |
NDTR0_TWH(nfc_tmg.tWH) |
NDTR0_TCS(nfc_tmg.tCS) |
NDTR0_TCH(nfc_tmg.tCH) |
NDTR0_RD_CNT_DEL(read_delay) |
NDTR0_SELCNTR |
NDTR0_TADL(nfc_tmg.tADL);
NDTR0_TCH(nfc_tmg.tCH);
marvell_nand->ndtr1 =
NDTR1_TAR(nfc_tmg.tAR) |
NDTR1_TWHR(nfc_tmg.tWHR) |
NDTR1_TRHW(nfc_tmg.tRHW) |
NDTR1_WAIT_MODE |
NDTR1_TR(nfc_tmg.tR);
if (nfc->caps->is_nfcv2) {
marvell_nand->ndtr0 |=
NDTR0_RD_CNT_DEL(read_delay) |
NDTR0_SELCNTR |
NDTR0_TADL(nfc_tmg.tADL);
marvell_nand->ndtr1 |=
NDTR1_TRHW(nfc_tmg.tRHW) |
NDTR1_WAIT_MODE;
}
return 0;
}
@ -2395,8 +2415,7 @@ static int marvell_nand_chip_init(struct device *dev, struct marvell_nfc *nfc,
chip->exec_op = marvell_nfc_exec_op;
chip->select_chip = marvell_nfc_select_chip;
if (nfc->caps->is_nfcv2 &&
!of_property_read_bool(np, "marvell,nand-keep-config"))
if (!of_property_read_bool(np, "marvell,nand-keep-config"))
chip->setup_data_interface = marvell_nfc_setup_data_interface;
mtd = nand_to_mtd(chip);