diff options
| author | Miquel Raynal <miquel.raynal@bootlin.com> | 2021-05-27 10:49:59 +0200 |
|---|---|---|
| committer | Miquel Raynal <miquel.raynal@bootlin.com> | 2021-06-18 09:45:20 +0200 |
| commit | 76e12c104f627a24487fe1bfa0ed8563e36a5ce2 (patch) | |
| tree | f7cf14af47f8b6ae7c28326a34b7e3fac1f5b191 /drivers/mtd/nand | |
| parent | 23739c34f56c7eaa62d00b70dc8bf31b8244ef83 (diff) | |
mtd: rawnand: arasan: Finer grain NV-DDR configuration
Add support for the timings register which may improve a bit the
overall throughput.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20210527084959.208804-2-miquel.raynal@bootlin.com
Diffstat (limited to 'drivers/mtd/nand')
| -rw-r--r-- | drivers/mtd/nand/raw/arasan-nand-controller.c | 56 |
1 files changed, 54 insertions, 2 deletions
diff --git a/drivers/mtd/nand/raw/arasan-nand-controller.c b/drivers/mtd/nand/raw/arasan-nand-controller.c index 5bcc680984f0..9cbcc698c64d 100644 --- a/drivers/mtd/nand/raw/arasan-nand-controller.c +++ b/drivers/mtd/nand/raw/arasan-nand-controller.c @@ -72,6 +72,15 @@ #define FLASH_STS_REG 0x28 +#define TIMING_REG 0x2C +#define TCCS_TIME_500NS 0 +#define TCCS_TIME_300NS 3 +#define TCCS_TIME_200NS 2 +#define TCCS_TIME_100NS 1 +#define FAST_TCAD BIT(2) +#define DQS_BUFF_SEL_IN(x) FIELD_PREP(GENMASK(6, 3), (x)) +#define DQS_BUFF_SEL_OUT(x) FIELD_PREP(GENMASK(18, 15), (x)) + #define DATA_PORT_REG 0x30 #define ECC_CONF_REG 0x34 @@ -145,6 +154,7 @@ struct anfc_op { * @page_sz: Register value of the page_sz field to use * @clk: Expected clock frequency to use * @data_iface: Data interface timing mode to use + * @timings: NV-DDR specific timings to use * @ecc_conf: Hardware ECC configuration value * @strength: Register value of the ECC strength * @raddr_cycles: Row address cycle information @@ -165,6 +175,7 @@ struct anand { unsigned int page_sz; unsigned long clk; u32 data_iface; + u32 timings; u32 ecc_conf; u32 strength; u16 raddr_cycles; @@ -332,6 +343,7 @@ static int anfc_select_target(struct nand_chip *chip, int target) /* Update the controller timings and the potential ECC configuration */ writel_relaxed(anand->data_iface, nfc->base + DATA_INTERFACE_REG); + writel_relaxed(anand->timings, nfc->base + TIMING_REG); /* Update clock frequency */ if (nfc->cur_clk != anand->clk) { @@ -955,6 +967,7 @@ static int anfc_setup_interface(struct nand_chip *chip, int target, struct device_node *np = nfc->dev->of_node; const struct nand_sdr_timings *sdr; const struct nand_nvddr_timings *nvddr; + unsigned int tccs_min, dqs_mode, fast_tcad; if (nand_interface_is_nvddr(conf)) { nvddr = nand_get_nvddr_timings(conf); @@ -969,13 +982,52 @@ static int anfc_setup_interface(struct nand_chip *chip, int target, if (target < 0) return 0; - if (nand_interface_is_sdr(conf)) + if (nand_interface_is_sdr(conf)) { anand->data_iface = DIFACE_SDR | DIFACE_SDR_MODE(conf->timings.mode); - else + anand->timings = 0; + } else { anand->data_iface = DIFACE_NVDDR | DIFACE_DDR_MODE(conf->timings.mode); + if (conf->timings.nvddr.tCCS_min <= 100000) + tccs_min = TCCS_TIME_100NS; + else if (conf->timings.nvddr.tCCS_min <= 200000) + tccs_min = TCCS_TIME_200NS; + else if (conf->timings.nvddr.tCCS_min <= 300000) + tccs_min = TCCS_TIME_300NS; + else + tccs_min = TCCS_TIME_500NS; + + fast_tcad = 0; + if (conf->timings.nvddr.tCAD_min < 45000) + fast_tcad = FAST_TCAD; + + switch (conf->timings.mode) { + case 5: + case 4: + dqs_mode = 2; + break; + case 3: + dqs_mode = 3; + break; + case 2: + dqs_mode = 4; + break; + case 1: + dqs_mode = 5; + break; + case 0: + default: + dqs_mode = 6; + break; + } + + anand->timings = tccs_min | fast_tcad | + DQS_BUFF_SEL_IN(dqs_mode) | + DQS_BUFF_SEL_OUT(dqs_mode); + } + anand->clk = ANFC_XLNX_SDR_DFLT_CORE_CLK; /* |