Implement support for DRAM MRQ GSCs.

Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
[treding@nvidia.com: drop unnecessary discrimination enum]
Signed-off-by: Thierry Reding <treding@nvidia.com>

It is preferred to use typed property access functions (i.e.
of_property_read_<type> functions) rather than low-level
of_get_property/of_find_property functions for reading properties. As
part of this, convert of_get_property/of_find_property calls to the
recently added of_property_present() helper when we just want to test
for presence of a property and nothing more.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

Some error paths in mrq_debug_read and bpmp_debug_show would overwrite
the return error code with a subsequent call to mrq_debug_close.

Change the code to only change the error code if there was no prior
error.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

The BPMP firmware driver never worked on big-endian kernels, and
cannot easily be made portable. Add a dependency to make this clear
in case anyone ever wants to try a big-endian kernel on this hardware.

Link: https://lore.kernel.org/linux-arm-kernel/Y34FCQ3xTmcjqKRT@orome/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

There is no need to call the dev_err() function directly to print a
custom message when handling an error from either the platform_get_irq()
or platform_get_irq_byname() functions as both are going to display an
appropriate error message in case of a failure.

./drivers/firmware/tegra/bpmp-tegra210.c:204:2-9: line 204 is redundant
because platform_get_irq() already prints an error
./drivers/firmware/tegra/bpmp-tegra210.c:216:2-9: line 216 is redundant
because platform_get_irq() already prints an error

Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=2579
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

The CPU and BPMP inter-processor communication code is only partially
endian-aware, so it doesn't work properly when run on a big-endian CPU
anyway. Running Tegra SoCs in big-endian mode has also never been
supported, especially not on those with 64-bit ARM processors.

If big-endian support ever becomes necessary this can be added back but
will need additional fixes for completeness.

Signed-off-by: Thierry Reding <treding@nvidia.com>

The shared memory used for inter-processor communication between the CPU
and the BPMP can reside either in system memory or in I/O memory. Use
the iosys-map helpers to abstract these differences away.

Signed-off-by: Thierry Reding <treding@nvidia.com>

The canonical type for 32-bit unsigned integers in the kernel is u32, so
use that instead of uint32_t.

Signed-off-by: Thierry Reding <treding@nvidia.com>

This patch fixes the following Coccinelle warning:

drivers/firmware/tegra/bpmp-debugfs.c:379: WARNING opportunity for memdup_user

Use memdup_user() rather than duplicating its implementation. This is a
little bit restricted to reduce false positives.

Signed-off-by: Qing Wang <wangqing@vivo.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

If an error occurs, debugfs_create_file() will return ERR_PTR(-ERROR),
so use IS_ERR() to check it.

Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@zte.com.cn>
Signed-off-by: Thierry Reding <treding@nvidia.com>