firmware: qcom: scm: Add qcom_scm_set_warm_boot_addr function

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@linaro.org>
Signed-off-by: Kumar Gala <galak@codeaurora.org>

diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index c953cc38918f1d00123aaed92d8598ff1cc201e4..4d8ede4807ac6f8120312608a4497d38714672ea 100644 (file)
--- 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 68a1d8801c6fc1935807d10897dfc08026835cf7..95ef72a47b0f655dea422faa4ea5793ad770914d 100644 (file)
--- 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))