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    Subject[PATCH v3 13/27] memory: omap-gpmc: Prevent mapping into 1st 16MB
    Date
    We have been preventing mapping GPMC children in the
    first 1MB but really it has to be the first 16MB as
    the minimum GPMC partition size is 16MB.

    Also print an error message if CS mapping fails
    due to DT requesting address outside the GPMC
    map.

    Signed-off-by: Roger Quadros <rogerq@ti.com>
    ---
    drivers/memory/omap-gpmc.c | 24 ++++++++++++++++++------
    1 file changed, 18 insertions(+), 6 deletions(-)

    diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
    index b09e1bc..bcf4b05 100644
    --- a/drivers/memory/omap-gpmc.c
    +++ b/drivers/memory/omap-gpmc.c
    @@ -93,6 +93,14 @@
    #define GPMC_CS_SIZE 0x30
    #define GPMC_BCH_SIZE 0x10

    +/*
    + * The first 1MB of GPMC address space is typically mapped to
    + * the internal ROM. Never allocate the first page, to
    + * facilitate bug detection; even if we didn't boot from ROM.
    + * As GPMC minimum partition size is 16MB we can only start from
    + * there.
    + */
    +#define GPMC_MEM_START 0x1000000
    #define GPMC_MEM_END 0x3FFFFFFF

    #define GPMC_CHUNK_SHIFT 24 /* 16 MB */
    @@ -1171,12 +1179,7 @@ static void gpmc_mem_init(void)
    {
    int cs;

    - /*
    - * The first 1MB of GPMC address space is typically mapped to
    - * the internal ROM. Never allocate the first page, to
    - * facilitate bug detection; even if we didn't boot from ROM.
    - */
    - gpmc_mem_root.start = SZ_1M;
    + gpmc_mem_root.start = GPMC_MEM_START;
    gpmc_mem_root.end = GPMC_MEM_END;

    /* Reserve all regions that has been set up by bootloader */
    @@ -1830,6 +1833,15 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
    if (ret < 0) {
    dev_err(&pdev->dev, "cannot remap GPMC CS %d to %pa\n",
    cs, &res.start);
    + if (res.start < GPMC_MEM_START) {
    + dev_info(&pdev->dev,
    + "GPMC CS %d start cannot be lesser than 0x%x\n",
    + cs, GPMC_MEM_START);
    + } else if (res.end > GPMC_MEM_END) {
    + dev_info(&pdev->dev,
    + "GPMC CS %d end cannot be greater than 0x%x\n",
    + cs, GPMC_MEM_END);
    + }
    goto err;
    }

    --
    2.1.4


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