linux-dev - Linux kernel development work

Age	Commit message (Collapse)	Author	Files	Lines
2017-07-17	Documentation: arm: Replace use of virt_to_phys with __pa_symbol	Geert Uytterhoeven	1	-1/+1
	All low-level PM/SMP code using virt_to_phys() should actually use __pa_symbol() against kernel symbols. Update the documentation to move away from virt_to_phys(). Cfr. commit 6996cbb2372189f7 ("ARM: 8641/1: treewide: Replace uses of virt_to_phys with __pa_symbol") Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2014-10-21	ARM: firmware: Introduce suspend and resume operations	Tomasz Figa	1	-23/+5
	This patch extends the firmware_ops structure with two new callbacks: .suspend() and .resume(). The former is intended to ask the firmware to save all its volatile state and suspend the system, without returning back to the kernel in between. The latter is to be called early by very low level platform suspend code after waking up to restore low level hardware state, which can't be restored in non-secure mode. While at it, outdated version of the structure is removed from the documentation and replaced with a reference to the header file. Signed-off-by: Tomasz Figa <t.figa@samsung.com> Acked-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-04-09	ARM: Add interface for registering and calling firmware-specific operations	Tomasz Figa	1	-0/+88
	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>