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authorChen-Yu Tsai <wens@csie.org>2018-01-17 09:46:54 +0100
committerChen-Yu Tsai <wens@csie.org>2018-02-16 05:19:18 +0100
commit43f624aa4f145497d2b1814916440a285f55a959 (patch)
tree7f10fbebbead3a53052a56ee2b554726d1fb554c /arch
parentARM: dts: sun9i: Add PRCM device node for the A80 dtsi (diff)
downloadlinux-43f624aa4f145497d2b1814916440a285f55a959.tar.xz
linux-43f624aa4f145497d2b1814916440a285f55a959.zip
ARM: dts: sun9i: Add secure SRAM node used for SMP hotplug
The A80 stores some magic flags in a portion of the secure SRAM. The BROM jumps directly to the software entry point set by the SMP code if the flags are set. This is required for CPU0 hotplugging. Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/boot/dts/sun9i-a80.dtsi19
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/arm/boot/dts/sun9i-a80.dtsi b/arch/arm/boot/dts/sun9i-a80.dtsi
index bf4d40e8359f..b1c86b76ac3c 100644
--- a/arch/arm/boot/dts/sun9i-a80.dtsi
+++ b/arch/arm/boot/dts/sun9i-a80.dtsi
@@ -250,6 +250,25 @@
*/
ranges = <0 0 0 0x20000000>;
+ sram_b: sram@20000 {
+ /* 256 KiB secure SRAM at 0x20000 */
+ compatible = "mmio-sram";
+ reg = <0x00020000 0x40000>;
+
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges = <0 0x00020000 0x40000>;
+
+ smp-sram@1000 {
+ /*
+ * This is checked by BROM to determine if
+ * cpu0 should jump to SMP entry vector
+ */
+ compatible = "allwinner,sun9i-a80-smp-sram";
+ reg = <0x1000 0x8>;
+ };
+ };
+
ehci0: usb@a00000 {
compatible = "allwinner,sun9i-a80-ehci", "generic-ehci";
reg = <0x00a00000 0x100>;