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Subject[PATCH] [RFC] mtd: atmel-quadspi: fix build issues
Date
I ran into a link-time error with the atmel-quadspi driver on the
EBSA110 platform:

drivers/mtd/built-in.o: In function `atmel_qspi_run_command':
:(.text+0x1ee3c): undefined reference to `_memcpy_toio'
:(.text+0x1ee48): undefined reference to `_memcpy_fromio'

The problem is that _memcpy_toio/_memcpy_fromio are not available
on that platform, and we have to prevent building the driver there.

A related problem is that the functions are not portable APIs
and should not be called directly from a device driver. On
little-endian machines, the regular memcpy_toio/memcpy_fromio
functions are defined as optimized versions using multi-byte
transfers that are much faster.

Cyrille mentioned that initially using memcpy_toio/memcpy_fromio
did not work, but I suspect that this was the result of a bug
that has since been fixed. With that change, we can also
compile-test on other architectures.

Link: http://lists.infradead.org/pipermail/linux-mtd/2016-July/068583.html
Fixes: 161aaab8a067 ("mtd: atmel-quadspi: add driver for Atmel QSPI controller")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
drivers/mtd/spi-nor/Kconfig | 2 +-
drivers/mtd/spi-nor/atmel-quadspi.c | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/spi-nor/Kconfig b/drivers/mtd/spi-nor/Kconfig
index 293c8a4d1e49..22e5fc4080f8 100644
--- a/drivers/mtd/spi-nor/Kconfig
+++ b/drivers/mtd/spi-nor/Kconfig
@@ -41,7 +41,7 @@ config SPI_ASPEED_SMC

config SPI_ATMEL_QUADSPI
tristate "Atmel Quad SPI Controller"
- depends on ARCH_AT91 || (ARM && COMPILE_TEST)
+ depends on ARCH_AT91 || (COMPILE_TEST && !ARCH_EBSA110)
depends on OF && HAS_IOMEM
help
This enables support for the Quad SPI controller in master mode.
diff --git a/drivers/mtd/spi-nor/atmel-quadspi.c b/drivers/mtd/spi-nor/atmel-quadspi.c
index ba76fa8f2031..ff3849106e77 100644
--- a/drivers/mtd/spi-nor/atmel-quadspi.c
+++ b/drivers/mtd/spi-nor/atmel-quadspi.c
@@ -208,9 +208,9 @@ static int atmel_qspi_run_transfer(struct atmel_qspi *aq,
if (cmd->enable.bits.address)
ahb_mem += cmd->address;
if (cmd->tx_buf)
- _memcpy_toio(ahb_mem, cmd->tx_buf, cmd->buf_len);
+ memcpy_toio(ahb_mem, cmd->tx_buf, cmd->buf_len);
else
- _memcpy_fromio(cmd->rx_buf, ahb_mem, cmd->buf_len);
+ memcpy_fromio(cmd->rx_buf, ahb_mem, cmd->buf_len);

return 0;
}
--
2.9.0
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