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firmware: psci: Do not bind driver if U-Boot runs in EL3

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There is no reason to bind psci driver if U-Boot runs in EL3 because
SMC/HVC instructions can't be called. That's why detect this state and
don't let user to crash from prompt by performing reset or poweroff
commands (if enabled).

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Michal Simek 2020-08-13 12:43:22 +02:00 • committed by Tom Rini
parent 565add124d
commit 10e4d64e34
1 changed files with 6 additions and 0 deletions
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6
drivers/firmware/psci.c
View file

@ -19,6 +19,7 @@
#include <linux/errno.h>
#include <linux/printk.h>
#include <linux/psci.h>
#include <asm/system.h>
#define DRIVER_NAME "psci"
@ -73,6 +74,11 @@ static int psci_probe(struct udevice *dev)
{
const char *method;
#if defined(CONFIG_ARM64)
if (current_el() == 3)
return -EINVAL;
#endif
method = ofnode_read_string(dev_ofnode(dev), "method");
if (!method) {
pr_warn("missing \"method\" property\n");