treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500

Based on 2 normalized pattern(s):

this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license version 2 as
published by the free software foundation

this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license version 2 as
published by the free software foundation #

extracted by the scancode license scanner the SPDX license identifier

GPL-2.0-only

has been chosen to replace the boilerplate/reference in 4122 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Enrico Weigelt <info@metux.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

ARM: Add interface for registering and calling firmware-specific operations

Some boards are running with secure firmware running in TrustZone secure
world, which changes the way some things have to be initialized.

This patch adds an interface for platforms to specify available firmware
operations and call them.

A wrapper macro, call_firmware_op(), checks if the operation is provided
and calls it if so, otherwise returns -ENOSYS to allow fallback to
legacy operation..

By default no operations are provided.

Example of use:

In code using firmware ops:

__raw_writel(virt_to_phys(exynos4_secondary_startup),
CPU1_BOOT_REG);

/* Call Exynos specific smc call */
if (call_firmware_op(cpu_boot, cpu) == -ENOSYS)
cpu_boot_legacy(...); /* Try legacy way */

gic_raise_softirq(cpumask_of(cpu), 1);

In board-/platform-specific code:

static int platformX_do_idle(void)
{
/* tell platformX firmware to enter idle */
return 0;
}

static int platformX_cpu_boot(int i)
{
/* tell platformX firmware to boot CPU i */
return 0;
}

static const struct firmware_ops platformX_firmware_ops = {
.do_idle = exynos_do_idle,
.cpu_boot = exynos_cpu_boot,
/* other operations not available on platformX */
};

static void __init board_init_early(void)
{
register_firmware_ops(&platformX_firmware_ops);
}

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>