diff options
Diffstat (limited to 'drivers/spi/cadence_qspi_apb.c')
| -rw-r--r-- | drivers/spi/cadence_qspi_apb.c | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/drivers/spi/cadence_qspi_apb.c b/drivers/spi/cadence_qspi_apb.c index 39e31f6..df6a91f 100644 --- a/drivers/spi/cadence_qspi_apb.c +++ b/drivers/spi/cadence_qspi_apb.c @@ -169,9 +169,6 @@ ((readl(base + CQSPI_REG_CONFIG) >> \ CQSPI_REG_CONFIG_IDLE_LSB) & 0x1) -#define CQSPI_CAL_DELAY(tdelay_ns, tref_ns, tsclk_ns) \ - ((((tdelay_ns) - (tsclk_ns)) / (tref_ns))) - #define CQSPI_GET_RD_SRAM_LEVEL(reg_base) \ (((readl(reg_base + CQSPI_REG_SDRAMLEVEL)) >> \ CQSPI_REG_SDRAMLEVEL_RD_LSB) & CQSPI_REG_SDRAMLEVEL_RD_MASK) @@ -355,16 +352,20 @@ void cadence_qspi_apb_delay(void *reg_base, cadence_qspi_apb_controller_disable(reg_base); /* Convert to ns. */ - ref_clk_ns = (1000000000) / ref_clk; + ref_clk_ns = DIV_ROUND_UP(1000000000, ref_clk); /* Convert to ns. */ - sclk_ns = (1000000000) / sclk_hz; - - /* Plus 1 to round up 1 clock cycle. */ - tshsl = CQSPI_CAL_DELAY(tshsl_ns, ref_clk_ns, sclk_ns) + 1; - tchsh = CQSPI_CAL_DELAY(tchsh_ns, ref_clk_ns, sclk_ns) + 1; - tslch = CQSPI_CAL_DELAY(tslch_ns, ref_clk_ns, sclk_ns) + 1; - tsd2d = CQSPI_CAL_DELAY(tsd2d_ns, ref_clk_ns, sclk_ns) + 1; + sclk_ns = DIV_ROUND_UP(1000000000, sclk_hz); + + /* The controller adds additional delay to that programmed in the reg */ + if (tshsl_ns >= sclk_ns + ref_clk_ns) + tshsl_ns -= sclk_ns + ref_clk_ns; + if (tchsh_ns >= sclk_ns + 3 * ref_clk_ns) + tchsh_ns -= sclk_ns + 3 * ref_clk_ns; + tshsl = DIV_ROUND_UP(tshsl_ns, ref_clk_ns); + tchsh = DIV_ROUND_UP(tchsh_ns, ref_clk_ns); + tslch = DIV_ROUND_UP(tslch_ns, ref_clk_ns); + tsd2d = DIV_ROUND_UP(tsd2d_ns, ref_clk_ns); reg = ((tshsl & CQSPI_REG_DELAY_TSHSL_MASK) << CQSPI_REG_DELAY_TSHSL_LSB); |