diff options
| author | Huang Shijie <b32955@freescale.com> | 2014-04-15 13:35:59 +0800 |
|---|---|---|
| committer | Nitin Garg <nitin.garg@freescale.com> | 2014-04-16 08:58:21 -0500 |
| commit | 753b8b8761404ae98eb0c76734bf512c17311a70 (patch) | |
| tree | a4de0bde3080f8c9005e902c7cd4ab17db256846 /drivers/mtd | |
| parent | 545c7383dfba874180b394f8b00b563a6541e158 (diff) | |
ENGR00308399 mtd: fsl-quadspi: quit if the M4 is using the quadspi
Detect if the quadspi is used by the M4.
If the M4 does use it, we quit.
Signed-off-by: Huang Shijie <b32955@freescale.com>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/spi-nor/fsl-quadspi.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c index 4f8bc62761d6..091b2ed99f86 100644 --- a/drivers/mtd/spi-nor/fsl-quadspi.c +++ b/drivers/mtd/spi-nor/fsl-quadspi.c @@ -882,6 +882,13 @@ static void fsl_qspi_unprep(struct spi_nor *nor, enum spi_nor_ops ops) clk_disable(q->clk_en); } +/* If the uboot enable the M4 to use the Quadspi, we should quit. */ +static bool fsl_m4_is_using(struct fsl_qspi *q) +{ + return (readl(q->iobase + QUADSPI_BUF0CR) == + QUADSPI_BUFXCR_INVALID_MSTRID); +} + static int fsl_qspi_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; @@ -948,6 +955,12 @@ static int fsl_qspi_probe(struct platform_device *pdev) goto map_failed; } + if (fsl_m4_is_using(q)) { + dev_info(dev, "The M4 is using quadspi controller, we quit.\n"); + ret = -EINVAL; + goto irq_failed; + } + /* find the irq */ ret = platform_get_irq(pdev, 0); if (ret < 0) { |