Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / powerpc / platforms / pasemi / idle.c

diff --git a/kernel/arch/powerpc/platforms/pasemi/idle.c b/kernel/arch/powerpc/platforms/pasemi/idle.c
new file mode 100644 (file)
index 0000000..75b296b
--- /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);