diff options
Diffstat (limited to 'drivers/firmware/psci.c')
| -rw-r--r-- | drivers/firmware/psci.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c index 68953cc..be57552 100644 --- a/drivers/firmware/psci.c +++ b/drivers/firmware/psci.c @@ -13,6 +13,7 @@ #include <log.h> #include <dm/lists.h> #include <efi_loader.h> +#include <sysreset.h> #include <linux/delay.h> #include <linux/libfdt.h> #include <linux/arm-smccc.h> @@ -26,6 +27,18 @@ #define PSCI_METHOD_HVC 1 #define PSCI_METHOD_SMC 2 +/* + * While a 64-bit OS can make calls with SMC32 calling conventions, for some + * calls it is necessary to use SMC64 to pass or return 64-bit values. + * For such calls PSCI_FN_NATIVE(version, name) will choose the appropriate + * (native-width) function ID. + */ +#if defined(CONFIG_ARM64) +#define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN64_##name +#else +#define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN_##name +#endif + #if CONFIG_IS_ENABLED(EFI_LOADER) int __efi_runtime_data psci_method; #else @@ -53,6 +66,34 @@ unsigned long __efi_runtime invoke_psci_fn return res.a0; } +static int psci_features(u32 psci_func_id) +{ + return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES, + psci_func_id, 0, 0); +} + +static u32 psci_0_2_get_version(void) +{ + return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0); +} + +static bool psci_is_system_reset2_supported(void) +{ + int ret; + u32 ver; + + ver = psci_0_2_get_version(); + + if (PSCI_VERSION_MAJOR(ver) >= 1) { + ret = psci_features(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2)); + + if (ret != PSCI_RET_NOT_SUPPORTED) + return true; + } + + return false; +} + static int psci_bind(struct udevice *dev) { /* No SYSTEM_RESET support for PSCI 0.1 */ @@ -141,6 +182,33 @@ void reset_misc(void) } #endif /* CONFIG_PSCI_RESET */ +void psci_sys_reset(u32 type) +{ + bool reset2_supported; + + do_psci_probe(); + + reset2_supported = psci_is_system_reset2_supported(); + + if (type == SYSRESET_WARM && reset2_supported) { + /* + * reset_type[31] = 0 (architectural) + * reset_type[30:0] = 0 (SYSTEM_WARM_RESET) + * cookie = 0 (ignored by the implementation) + */ + invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0); + } else { + invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0); + } +} + +void psci_sys_poweroff(void) +{ + do_psci_probe(); + + invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0); +} + #ifdef CONFIG_CMD_POWEROFF int do_poweroff(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]) { |