summaryrefslogtreecommitdiffstats
path: root/kernel/arch/powerpc/platforms/pasemi/idle.c
diff options
context:
space:
mode:
authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/powerpc/platforms/pasemi/idle.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/powerpc/platforms/pasemi/idle.c')
-rw-r--r--kernel/arch/powerpc/platforms/pasemi/idle.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/kernel/arch/powerpc/platforms/pasemi/idle.c b/kernel/arch/powerpc/platforms/pasemi/idle.c
new file mode 100644
index 000000000..75b296bc5
--- /dev/null
+++ b/kernel/arch/powerpc/platforms/pasemi/idle.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2006-2007 PA Semi, Inc
+ *
+ * Maintained by: Olof Johansson <olof@lixom.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#undef DEBUG
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/irq.h>
+
+#include <asm/machdep.h>
+#include <asm/reg.h>
+#include <asm/smp.h>
+
+#include "pasemi.h"
+
+struct sleep_mode {
+ char *name;
+ void (*entry)(void);
+};
+
+static struct sleep_mode modes[] = {
+ { .name = "spin", .entry = &idle_spin },
+ { .name = "doze", .entry = &idle_doze },
+};
+
+static int current_mode = 0;
+
+static int pasemi_system_reset_exception(struct pt_regs *regs)
+{
+ /* If we were woken up from power savings, we need to return
+ * to the calling function, since nip is not saved across
+ * all modes.
+ */
+
+ if (regs->msr & SRR1_WAKEMASK)
+ regs->nip = regs->link;
+
+ switch (regs->msr & SRR1_WAKEMASK) {
+ case SRR1_WAKEEE:
+ do_IRQ(regs);
+ break;
+ case SRR1_WAKEDEC:
+ timer_interrupt(regs);
+ break;
+ default:
+ /* do system reset */
+ return 0;
+ }
+
+ /* Set higher astate since we come out of power savings at 0 */
+ restore_astate(hard_smp_processor_id());
+
+ /* everything handled */
+ regs->msr |= MSR_RI;
+ return 1;
+}
+
+static int __init pasemi_idle_init(void)
+{
+#ifndef CONFIG_PPC_PASEMI_CPUFREQ
+ printk(KERN_WARNING "No cpufreq driver, powersavings modes disabled\n");
+ current_mode = 0;
+#endif
+
+ ppc_md.system_reset_exception = pasemi_system_reset_exception;
+ ppc_md.power_save = modes[current_mode].entry;
+ printk(KERN_INFO "Using PA6T idle loop (%s)\n", modes[current_mode].name);
+
+ return 0;
+}
+machine_late_initcall(pasemi, pasemi_idle_init);
+
+static int __init idle_param(char *p)
+{
+ int i;
+ for (i = 0; i < ARRAY_SIZE(modes); i++) {
+ if (!strcmp(modes[i].name, p)) {
+ current_mode = i;
+ break;
+ }
+ }
+ return 0;
+}
+
+early_param("idle", idle_param);