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authorLina Iyer <lina.iyer@linaro.org>2015-03-03 02:30:30 +0300
committerKumar Gala <galak@codeaurora.org>2015-03-11 23:15:11 +0300
commit767b0235dd476596c0d4154839ae6880bec71b3c (patch)
tree4aad70dd43d4fca3d9a215eb9d5398d70f663176 /drivers/firmware
parent2ce76a6ad32fa076a2bb5561e859c97fceec8bb1 (diff)
downloadlinux-767b0235dd476596c0d4154839ae6880bec71b3c.tar.xz
firmware: qcom: scm: Support cpu power down through SCM
Support powering down the calling cpu, by trapping into SCM. This termination function triggers the ARM cpu to execute WFI instruction, causing the power controller to safely power the cpu down. Caches may be flushed before powering down the cpu. If cache controller is set to turn off when the cpu is powered down, then the flags argument indicates to the secure mode to flush its cache lines before executing WFI.The warm boot reset address for the cpu should be set before the calling into this function for the cpu to resume. The original code for the qcom_scm_call_atomic1() comes from a patch by Stephen Boyd [1]. The function scm_call_atomic1() has been cherry picked and renamed to match the convention used in this file. Since there are no users of scm_call_atomic2(), the function is not included. [1]. https://lkml.org/lkml/2014/8/4/765 Signed-off-by: Stephen Boyd <sboyd@codeauraro.org> Signed-off-by: Lina Iyer <lina.iyer@linaro.org> Signed-off-by: Kumar Gala <galak@codeaurora.org>
Diffstat (limited to 'drivers/firmware')
-rw-r--r--drivers/firmware/qcom_scm.c57
1 files changed, 57 insertions, 0 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);