[PATCH v2 3/4] mtd:spi-nor:fsl-quadspi:Add fast-read mode support

From: Yunhui Cui
Date: Mon Feb 01 2016 - 06:54:31 EST


The qspi driver add generic fast-read mode for different
flash venders. There are some different board flash work on
different mode, such fast-read, quad-mode.
So we have to modify the third entrace parameter of spi_nor_scan().

Signed-off-by: Yunhui Cui <B56489@xxxxxxxxxxxxx>
---
drivers/mtd/spi-nor/fsl-quadspi.c | 27 +++++++++++++++++++++------
1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
index 9861290..0a31cb1 100644
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -389,11 +389,21 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
/* Read */
lut_base = SEQID_READ * 4;

- qspi_writel(q, LUT0(CMD, PAD1, read_op) | LUT1(ADDR, PAD1, addrlen),
- base + QUADSPI_LUT(lut_base));
- qspi_writel(q, LUT0(DUMMY, PAD1, read_dm) |
- LUT1(FSL_READ, PAD4, rxfifo),
- base + QUADSPI_LUT(lut_base + 1));
+ if (nor->flash_read == SPI_NOR_FAST) {
+ qspi_writel(q, LUT0(CMD, PAD1, read_op) |
+ LUT1(ADDR, PAD1, addrlen),
+ base + QUADSPI_LUT(lut_base));
+ qspi_writel(q, LUT0(DUMMY, PAD1, read_dm) |
+ LUT1(FSL_READ, PAD1, rxfifo),
+ base + QUADSPI_LUT(lut_base + 1));
+ } else if (nor->flash_read == SPI_NOR_QUAD) {
+ qspi_writel(q, LUT0(CMD, PAD1, read_op) |
+ LUT1(ADDR, PAD1, addrlen),
+ base + QUADSPI_LUT(lut_base));
+ qspi_writel(q, LUT0(DUMMY, PAD1, read_dm) |
+ LUT1(FSL_READ, PAD4, rxfifo),
+ base + QUADSPI_LUT(lut_base + 1));
+ }

/* Write enable */
lut_base = SEQID_WREN * 4;
@@ -468,6 +478,7 @@ static int fsl_qspi_get_seqid(struct fsl_qspi *q, u8 cmd)
{
switch (cmd) {
case SPINOR_OP_READ_1_1_4:
+ case SPINOR_OP_READ_FAST:
return SEQID_READ;
case SPINOR_OP_WREN:
return SEQID_WREN;
@@ -963,6 +974,7 @@ static int fsl_qspi_probe(struct platform_device *pdev)
struct spi_nor *nor;
struct mtd_info *mtd;
int ret, i = 0;
+ enum read_mode mode = SPI_NOR_QUAD;

q = devm_kzalloc(dev, sizeof(*q), GFP_KERNEL);
if (!q)
@@ -1064,7 +1076,10 @@ static int fsl_qspi_probe(struct platform_device *pdev)
/* set the chip address for READID */
fsl_qspi_set_base_addr(q, nor);

- ret = spi_nor_scan(nor, NULL, SPI_NOR_QUAD);
+ ret = of_property_read_bool(np, "m25p,fast-read");
+ mode = (ret) ? SPI_NOR_FAST : SPI_NOR_QUAD;
+
+ ret = spi_nor_scan(nor, NULL, mode);
if (ret)
goto mutex_failed;

--
2.1.0.27.g96db324