A core can be powered down for cpuidle or when it is hotplugged off. In
either case, the warmboot return address would be different. Allow
setting the warmboot address for a specific cpu, optimize and write to
the firmware, if the address is different than the previously set
address.
Export qcom_scm_set_warm_boot_addr function move the warm boot flags to
implementation.
Signed-off-by: Lina Iyer <lina.iyer@xxxxxxxxxx>
---
drivers/firmware/qcom_scm.c | 56 +++++++++++++++++++++++++++++++++++++++++++++
include/linux/qcom_scm.h | 7 ++----
2 files changed, 58 insertions(+), 5 deletions(-)
diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index c953cc3..4d8ede4 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -1,4 +1,5 @@
/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+ * Copyright (C) 2015 Linaro Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@@ -39,6 +40,23 @@
#define QCOM_SCM_FLAG_COLDBOOT_CPU2 0x08
#define QCOM_SCM_FLAG_COLDBOOT_CPU3 0x20
+#define QCOM_SCM_FLAG_WARMBOOT_CPU0 0x04
+#define QCOM_SCM_FLAG_WARMBOOT_CPU1 0x02
+#define QCOM_SCM_FLAG_WARMBOOT_CPU2 0x10
+#define QCOM_SCM_FLAG_WARMBOOT_CPU3 0x40
+
+struct qcom_scm_entry {
+ int flag;
+ void *entry;
+};
+
+static struct qcom_scm_entry qcom_scm_wb[] = {
+ { .flag = QCOM_SCM_FLAG_WARMBOOT_CPU0 },
+ { .flag = QCOM_SCM_FLAG_WARMBOOT_CPU1 },
+ { .flag = QCOM_SCM_FLAG_WARMBOOT_CPU2 },
+ { .flag = QCOM_SCM_FLAG_WARMBOOT_CPU3 },
+};
+
static DEFINE_MUTEX(qcom_scm_lock);
/**
@@ -379,3 +397,41 @@ int qcom_scm_set_cold_boot_addr(void *entry, const cpumask_t *cpus)
return qcom_scm_set_boot_addr(virt_to_phys(entry), flags);
}
EXPORT_SYMBOL(qcom_scm_set_cold_boot_addr);
+
+/**
+ * qcom_scm_set_warm_boot_addr() - Set the warm boot address for cpus
+ * @entry: Entry point function for the cpus
+ * @cpus: The cpumask of cpus that will use the entry point
+ *
+ * Set the Linux entry point for the SCM to transfer control to when coming
+ * out of a power down. CPU power down may be executed on cpuidle or hotplug.
+ */
+int qcom_scm_set_warm_boot_addr(void *entry, const cpumask_t *cpus)
+{
+ int ret;
+ int flags = 0;
+ int cpu;
+
+ /*
+ * Reassign only if we are switching from hotplug entry point
+ * to cpuidle entry point or vice versa.
+ */
+ for_each_cpu(cpu, cpus) {
+ if (entry == qcom_scm_wb[cpu].entry)
+ continue;
+ flags |= qcom_scm_wb[cpu].flag;
+ }
+
+ /* No change in entry function */
+ if (!flags)
+ return 0;
+
+ ret = qcom_scm_set_boot_addr(virt_to_phys(entry), flags);
+ if (!ret) {
+ for_each_cpu(cpu, cpus)
+ qcom_scm_wb[cpu].entry = entry;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(qcom_scm_set_warm_boot_addr);
diff --git a/include/linux/qcom_scm.h b/include/linux/qcom_scm.h
index 68a1d88..95ef72a 100644
--- a/include/linux/qcom_scm.h
+++ b/include/linux/qcom_scm.h
@@ -1,4 +1,5 @@
/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+ * Copyright (C) 2015 Linaro Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@@ -12,12 +13,8 @@
#ifndef __QCOM_SCM_H
#define __QCOM_SCM_H
-#define QCOM_SCM_FLAG_WARMBOOT_CPU0 0x04
-#define QCOM_SCM_FLAG_WARMBOOT_CPU1 0x02
-#define QCOM_SCM_FLAG_WARMBOOT_CPU2 0x10
-#define QCOM_SCM_FLAG_WARMBOOT_CPU3 0x40
-
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_VERSION(major, minor) (((major) << 16) | ((minor) & 0xFF))
--
2.1.0
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