diff options
| -rw-r--r-- | drivers/firmware/qcom_scm.c | 57 | ||||
| -rw-r--r-- | include/linux/qcom_scm.h | 7 |
2 files changed, 63 insertions, 1 deletions
diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c index 4d8ede4807ac..994b50fd997c 100644 --- a/drivers/firmware/qcom_scm.c +++ b/drivers/firmware/qcom_scm.c @@ -311,6 +311,45 @@ out: return ret; } +#define SCM_CLASS_REGISTER (0x2 << 8) +#define SCM_MASK_IRQS BIT(5) +#define SCM_ATOMIC(svc, cmd, n) (((((svc) << 10)|((cmd) & 0x3ff)) << 12) | \ + SCM_CLASS_REGISTER | \ + SCM_MASK_IRQS | \ + (n & 0xf)) + +/** + * qcom_scm_call_atomic1() - Send an atomic SCM command with one argument + * @svc_id: service identifier + * @cmd_id: command identifier + * @arg1: first argument + * + * This shall only be used with commands that are guaranteed to be + * uninterruptable, atomic and SMP safe. + */ +static s32 qcom_scm_call_atomic1(u32 svc, u32 cmd, u32 arg1) +{ + int context_id; + + register u32 r0 asm("r0") = SCM_ATOMIC(svc, cmd, 1); + register u32 r1 asm("r1") = (u32)&context_id; + register u32 r2 asm("r2") = arg1; + + asm volatile( + __asmeq("%0", "r0") + __asmeq("%1", "r0") + __asmeq("%2", "r1") + __asmeq("%3", "r2") +#ifdef REQUIRES_SEC + ".arch_extension sec\n" +#endif + "smc #0 @ switch to secure world\n" + : "=r" (r0) + : "r" (r0), "r" (r1), "r" (r2) + : "r3"); + return r0; +} + u32 qcom_scm_get_version(void) { int context_id; @@ -435,3 +474,21 @@ int qcom_scm_set_warm_boot_addr(void *entry, const cpumask_t *cpus) return ret; } EXPORT_SYMBOL(qcom_scm_set_warm_boot_addr); + +#define QCOM_SCM_CMD_TERMINATE_PC 0x2 +#define QCOM_SCM_FLUSH_FLAG_MASK 0x3 + +/** + * qcom_scm_cpu_power_down() - Power down the cpu + * @flags - Flags to flush cache + * + * This is an end point to power down cpu. If there was a pending interrupt, + * the control would return from this function, otherwise, the cpu jumps to the + * warm boot entry point set for this cpu upon reset. + */ +void qcom_scm_cpu_power_down(u32 flags) +{ + qcom_scm_call_atomic1(QCOM_SCM_SVC_BOOT, QCOM_SCM_CMD_TERMINATE_PC, + flags & QCOM_SCM_FLUSH_FLAG_MASK); +} +EXPORT_SYMBOL(qcom_scm_cpu_power_down); diff --git a/include/linux/qcom_scm.h b/include/linux/qcom_scm.h index 95ef72a47b0f..d7a974d5f57c 100644 --- a/include/linux/qcom_scm.h +++ b/include/linux/qcom_scm.h @@ -1,4 +1,4 @@ -/* Copyright (c) 2010, Code Aurora Forum. All rights reserved. +/* Copyright (c) 2010-2014, The Linux Foundation. All rights reserved. * Copyright (C) 2015 Linaro Ltd. * * This program is free software; you can redistribute it and/or modify @@ -16,6 +16,11 @@ extern int qcom_scm_set_cold_boot_addr(void *entry, const cpumask_t *cpus); extern int qcom_scm_set_warm_boot_addr(void *entry, const cpumask_t *cpus); +#define QCOM_SCM_CPU_PWR_DOWN_L2_ON 0x0 +#define QCOM_SCM_CPU_PWR_DOWN_L2_OFF 0x1 + +extern void qcom_scm_cpu_power_down(u32 flags); + #define QCOM_SCM_VERSION(major, minor) (((major) << 16) | ((minor) & 0xFF)) extern u32 qcom_scm_get_version(void); |