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spi: atmel-quadspi: fix possible MMIO window size overrun 

The QSPI controller memory space is limited to 128MB:
0x9000_00000-0x9800_00000/0XD000_0000--0XD800_0000.

There are nor flashes that are bigger in size than the memory size
supported by the controller: Micron MT25QL02G (256 MB).

Check if the address exceeds the MMIO window size. An improvement
would be to add support for regular SPI mode and fall back to it
when the flash memories overrun the controller's memory space.

Fixes: 0e6aae08e9 ("spi: Add QuadSPI driver for Atmel SAMA5D2")
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20200228155437.1558219-1-tudor.ambarus@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Tudor Ambarus 2020-02-28 15:55:32 +00:00 committed by Mark Brown
parent 5dd8304981
commit 8e093ea4d3
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GPG Key ID: 24D68B725D5487D0
1 changed files with 11 additions and 0 deletions
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11
drivers/spi/atmel-quadspi.c
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@ -149,6 +149,7 @@ struct atmel_qspi {
struct clk *qspick;
struct platform_device *pdev;
const struct atmel_qspi_caps *caps;
resource_size_t mmap_size;
u32 pending;
u32 mr;
u32 scr;
@ -329,6 +330,14 @@ static int atmel_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
u32 sr, offset;
int err;
/*
* Check if the address exceeds the MMIO window size. An improvement
* would be to add support for regular SPI mode and fall back to it
* when the flash memories overrun the controller's memory space.
*/
if (op->addr.val + op->data.nbytes > aq->mmap_size)
return -ENOTSUPP;
err = atmel_qspi_set_cfg(aq, op, &offset);
if (err)
return err;
@ -480,6 +489,8 @@ static int atmel_qspi_probe(struct platform_device *pdev)
goto exit;
}
aq->mmap_size = resource_size(res);
/* Get the peripheral clock */
aq->pclk = devm_clk_get(&pdev->dev, "pclk");
if (IS_ERR(aq->pclk))