arm64: add better and more generic spin-table support

There are two enable methods supported by ARM64 Linux; psci and
spin-table.  The latter is simpler and helpful for quick SoC bring
up.  My main motivation for this patch is to improve the spin-table
support, which allows us to boot an ARMv8 system without the ARM
Trusted Firmware.

Currently, we have multi-entry code in arch/arm/cpu/armv8/start.S
and the spin-table is supported in a really ad-hoc way, and I see
some problems:

  - We must hard-code CPU_RELEASE_ADDR so that it matches the
    "cpu-release-addr" property in the DT that comes from the
    kernel tree.

  - The Documentation/arm64/booting.txt in Linux requires that
    the release address must be zero-initialized, but it is not
    cared by the common code in U-Boot.  We must do it in a board
    function.

  - There is no systematic way to protect the spin-table code from
    the kernel.  We are supposed to do it in a board specific manner,
    but it is difficult to predict where the spin-table code will be
    located after the relocation.  So, it also makes difficult to
    hard-code /memreserve/ in the DT of the kernel.

So, here is a patch to solve those problems; the DT is run-time
modified to reserve the spin-table code (+ cpu-release-addr).
Also, the "cpu-release-addr" property is set to an appropriate
address after the relocation, which means we no longer need the
hard-coded CPU_RELEASE_ADDR.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv8/Kconfig b/arch/arm/cpu/armv8/Kconfig
index 3d19bbf..acf2460 100644
--- a/arch/arm/cpu/armv8/Kconfig
+++ b/arch/arm/cpu/armv8/Kconfig
@@ -3,4 +3,22 @@ if ARM64
 config ARMV8_MULTIENTRY
         boolean "Enable multiple CPUs to enter into U-Boot"
 
+config ARMV8_SPIN_TABLE
+	bool "Support spin-table enable method"
+	depends on ARMV8_MULTIENTRY && OF_LIBFDT
+	help
+	  Say Y here to support "spin-table" enable method for booting Linux.
+
+	  To use this feature, you must do:
+	    - Specify enable-method = "spin-table" in each CPU node in the
+	      Device Tree you are using to boot the kernel
+	    - Let secondary CPUs in U-Boot (in a board specific manner)
+	      before the master CPU jumps to the kernel
+
+	  U-Boot automatically does:
+	    - Set "cpu-release-addr" property of each CPU node
+	      (overwrites it if already exists).
+	    - Reserve the code for the spin-table and the release address
+	      via a /memreserve/ region in the Device Tree.
+
 endif