[PATCH 3/4] spi: spi-nxp-fspi: add DDR mode support
From: haibo.chen@nxp.com
Date: 2021-08-20 08:06:17
Subsystem:
nxp fspi driver, spi subsystem, the rest · Maintainers:
Han Xu, Haibo Chen, Mark Brown, Linus Torvalds
From: Haibo Chen <haibo.chen@nxp.com> For LUT, add DDR command support. Also use new API spi_mem_dtr_supports_op() to check the DTR mode. Signed-off-by: Haibo Chen <haibo.chen@nxp.com> --- drivers/spi/spi-nxp-fspi.c | 25 ++++++++++++++++++++----- 1 file changed, 20 insertions(+), 5 deletions(-)
diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c
index a764eb475aed..f7acad2cbe64 100644
--- a/drivers/spi/spi-nxp-fspi.c
+++ b/drivers/spi/spi-nxp-fspi.c@@ -486,6 +486,9 @@ static bool nxp_fspi_supports_op(struct spi_mem *mem, op->data.nbytes > f->devtype_data->txfifo) return false; + if (op->cmd.dtr && op->addr.dtr && op->dummy.dtr && op->data.dtr) + return spi_mem_dtr_supports_op(mem, op); + return spi_mem_default_supports_op(mem, op); }
@@ -534,12 +537,22 @@ static void nxp_fspi_prepare_lut(struct nxp_fspi *f, int lutidx = 1, i; /* cmd */ - lutval[0] |= LUT_DEF(0, LUT_CMD, LUT_PAD(op->cmd.buswidth), - op->cmd.opcode); + if (op->cmd.dtr) { + lutval[0] |= LUT_DEF(0, LUT_CMD_DDR, LUT_PAD(op->cmd.buswidth), + op->cmd.opcode >> 8); + lutval[lutidx / 2] |= LUT_DEF(lutidx, LUT_CMD_DDR, + LUT_PAD(op->cmd.buswidth), + op->cmd.opcode & 0x00ff); + lutidx++; + } else { + lutval[0] |= LUT_DEF(0, LUT_CMD, LUT_PAD(op->cmd.buswidth), + op->cmd.opcode); + } /* addr bytes */ if (op->addr.nbytes) { - lutval[lutidx / 2] |= LUT_DEF(lutidx, LUT_ADDR, + lutval[lutidx / 2] |= LUT_DEF(lutidx, op->addr.dtr ? + LUT_ADDR_DDR : LUT_ADDR, LUT_PAD(op->addr.buswidth), op->addr.nbytes * 8); lutidx++;
@@ -547,7 +560,8 @@ static void nxp_fspi_prepare_lut(struct nxp_fspi *f, /* dummy bytes, if needed */ if (op->dummy.nbytes) { - lutval[lutidx / 2] |= LUT_DEF(lutidx, LUT_DUMMY, + lutval[lutidx / 2] |= LUT_DEF(lutidx, op->dummy.dtr ? + LUT_DUMMY_DDR : LUT_DUMMY, /* * Due to FlexSPI controller limitation number of PAD for dummy * buswidth needs to be programmed as equal to data buswidth.
@@ -562,7 +576,8 @@ static void nxp_fspi_prepare_lut(struct nxp_fspi *f, if (op->data.nbytes) { lutval[lutidx / 2] |= LUT_DEF(lutidx, op->data.dir == SPI_MEM_DATA_IN ? - LUT_NXP_READ : LUT_NXP_WRITE, + (op->data.dtr ? LUT_READ_DDR : LUT_NXP_READ) : + (op->data.dtr ? LUT_WRITE_DDR : LUT_NXP_WRITE), LUT_PAD(op->data.buswidth), 0); lutidx++;
--
2.17.1