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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
This commit is contained in:
Miquel Raynal 2021-05-27 10:49:59 +02:00
parent 23739c34f5
commit 76e12c104f
1 changed files with 54 additions and 2 deletions
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56
drivers/mtd/nand/raw/arasan-nand-controller.c
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@ -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;
/*