diff options
| author | Linus Walleij | 2019-10-21 01:00:42 +0200 |
|---|---|---|
| committer | Miquel Raynal | 2019-10-29 14:24:53 +0100 |
| commit | 2aba2f2a704d368583e832555b25d88265e62b6d (patch) | |
| tree | df3c5d069ce312563550a61032e3f486d22b5fdb /drivers/mtd/maps/physmap-ixp4xx.h | |
| parent | 8b3cc926223be73bb2ab5f9465f157fc27e06eca (diff) | |
mtd: physmap_of: add a hook for Intel IXP4xx flash probing
In order to support device tree probing of IXP4xx NOR flash
chips, a certain big-endian or mixed-endian memory access
pattern need to be used.
I have opted to use the pattern set by previous plug-ins
to physmap for Gemini and Versatile, just override some
functions and reuse most of the physmap core code as it
is to minimize maintenance.
Parts of drivers/mtd/ixp4xx.c are copied into this file.
After we have IXP4xx converted fully to device tree, the
drivers/mtd/ixp4xx.c file will be deleted and this will
be the only access pattern to the IXP4xx flash.
I did not keep the quirk in the flash write function
after probe, where the old code for a while checks for
access to odd addresses, fails and assigns a "faster"
write function once it has convinced probe to only use
2-byte accesses. As we mandate that this device should
be using bank-width = <2> this should not be a problem
unless misconfigured.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Diffstat (limited to 'drivers/mtd/maps/physmap-ixp4xx.h')
| -rw-r--r-- | drivers/mtd/maps/physmap-ixp4xx.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/mtd/maps/physmap-ixp4xx.h b/drivers/mtd/maps/physmap-ixp4xx.h new file mode 100644 index 000000000000..b0fc49b7f3ed --- /dev/null +++ b/drivers/mtd/maps/physmap-ixp4xx.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include <linux/of.h> +#include <linux/mtd/map.h> + +#ifdef CONFIG_MTD_PHYSMAP_IXP4XX +int of_flash_probe_ixp4xx(struct platform_device *pdev, + struct device_node *np, + struct map_info *map); +#else +static inline +int of_flash_probe_ixp4xx(struct platform_device *pdev, + struct device_node *np, + struct map_info *map) +{ + return 0; +} +#endif |