diff options
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/psci.c | 100 |
1 files changed, 84 insertions, 16 deletions
diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c index 2cb35f356f..c8c47acfd3 100644 --- a/drivers/firmware/psci.c +++ b/drivers/firmware/psci.c @@ -9,31 +9,38 @@ #include <common.h> #include <dm.h> #include <dm/lists.h> +#include <efi_loader.h> #include <linux/libfdt.h> #include <linux/arm-smccc.h> #include <linux/errno.h> #include <linux/printk.h> #include <linux/psci.h> -psci_fn *invoke_psci_fn; +#define DRIVER_NAME "psci" -static unsigned long __invoke_psci_fn_hvc(unsigned long function_id, - unsigned long arg0, unsigned long arg1, - unsigned long arg2) -{ - struct arm_smccc_res res; +#define PSCI_METHOD_HVC 1 +#define PSCI_METHOD_SMC 2 - arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res); - return res.a0; -} +int __efi_runtime_data psci_method; -static unsigned long __invoke_psci_fn_smc(unsigned long function_id, - unsigned long arg0, unsigned long arg1, - unsigned long arg2) +unsigned long __efi_runtime invoke_psci_fn + (unsigned long function_id, unsigned long arg0, + unsigned long arg1, unsigned long arg2) { struct arm_smccc_res res; - arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res); + /* + * In the __efi_runtime we need to avoid the switch statement. In some + * cases the compiler creates lookup tables to implement switch. These + * tables are not correctly relocated when SetVirtualAddressMap is + * called. + */ + if (psci_method == PSCI_METHOD_SMC) + arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res); + else if (psci_method == PSCI_METHOD_HVC) + arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res); + else + res.a0 = PSCI_RET_DISABLED; return res.a0; } @@ -67,9 +74,9 @@ static int psci_probe(struct udevice *dev) } if (!strcmp("hvc", method)) { - invoke_psci_fn = __invoke_psci_fn_hvc; + psci_method = PSCI_METHOD_HVC; } else if (!strcmp("smc", method)) { - invoke_psci_fn = __invoke_psci_fn_smc; + psci_method = PSCI_METHOD_SMC; } else { pr_warn("invalid \"method\" property: %s\n", method); return -EINVAL; @@ -78,6 +85,67 @@ static int psci_probe(struct udevice *dev) return 0; } +/** + * void do_psci_probe() - probe PSCI firmware driver + * + * Ensure that psci_method is initialized. + */ +static void __maybe_unused do_psci_probe(void) +{ + struct udevice *dev; + + uclass_get_device_by_name(UCLASS_FIRMWARE, DRIVER_NAME, &dev); +} + +#if IS_ENABLED(CONFIG_EFI_LOADER) && IS_ENABLED(CONFIG_PSCI_RESET) +efi_status_t efi_reset_system_init(void) +{ + do_psci_probe(); + return EFI_SUCCESS; +} + +void __efi_runtime EFIAPI efi_reset_system(enum efi_reset_type reset_type, + efi_status_t reset_status, + unsigned long data_size, + void *reset_data) +{ + if (reset_type == EFI_RESET_COLD || + reset_type == EFI_RESET_WARM || + reset_type == EFI_RESET_PLATFORM_SPECIFIC) { + invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0); + } else if (reset_type == EFI_RESET_SHUTDOWN) { + invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0); + } + while (1) + ; +} +#endif /* IS_ENABLED(CONFIG_EFI_LOADER) && IS_ENABLED(CONFIG_PSCI_RESET) */ + +#ifdef CONFIG_PSCI_RESET +void reset_misc(void) +{ + do_psci_probe(); + invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0); +} +#endif /* CONFIG_PSCI_RESET */ + +#ifdef CONFIG_CMD_POWEROFF +int do_poweroff(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + do_psci_probe(); + + puts("poweroff ...\n"); + udelay(50000); /* wait 50 ms */ + + disable_interrupts(); + invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0); + enable_interrupts(); + + log_err("Power off not supported on this platform\n"); + return CMD_RET_FAILURE; +} +#endif + static const struct udevice_id psci_of_match[] = { { .compatible = "arm,psci" }, { .compatible = "arm,psci-0.2" }, @@ -86,7 +154,7 @@ static const struct udevice_id psci_of_match[] = { }; U_BOOT_DRIVER(psci) = { - .name = "psci", + .name = DRIVER_NAME, .id = UCLASS_FIRMWARE, .of_match = psci_of_match, .bind = psci_bind, |