avr32: Move sleep code into mach-at32ap

Create a new file, pm-at32ap700x.S, in mach-at32ap and move the CPU
idle sleep code there. Make it possible to disable the sleep code.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

arch/avr32/kernel/entry-avr32b.S

@@ -741,26 +741,6 @@ irq_level\level:
 
 	.section .irq.text,"ax",@progbits
 
-.global cpu_idle_sleep
-cpu_idle_sleep:
-	mask_interrupts
-	get_thread_info r8
-	ld.w	r9, r8[TI_flags]
-	bld	r9, TIF_NEED_RESCHED
-	brcs	cpu_idle_enable_int_and_exit
-	sbr	r9, TIF_CPU_GOING_TO_SLEEP
-	st.w	r8[TI_flags], r9
-	unmask_interrupts
-	sleep 0
-cpu_idle_skip_sleep:
-	mask_interrupts
-	ld.w	r9, r8[TI_flags]
-	cbr	r9, TIF_CPU_GOING_TO_SLEEP
-	st.w	r8[TI_flags], r9
-cpu_idle_enable_int_and_exit:
-	unmask_interrupts
-	retal	r12
-
 	.global	irq_level0
 	.global	irq_level1
 	.global	irq_level2

arch/avr32/kernel/process.c

@@ -18,11 +18,11 @@
 #include <asm/sysreg.h>
 #include <asm/ocd.h>
 
+#include <asm/arch/pm.h>
+
 void (*pm_power_off)(void) = NULL;
 EXPORT_SYMBOL(pm_power_off);
 
-extern void cpu_idle_sleep(void);
-
 /*
  * This file handles the architecture-dependent parts of process handling..
  */

arch/avr32/mach-at32ap/Makefile

@@ -1,4 +1,4 @@
 obj-y				+= at32ap.o clock.o intc.o extint.o pio.o hsmc.o
-obj-$(CONFIG_CPU_AT32AP700X)	+= at32ap700x.o
+obj-$(CONFIG_CPU_AT32AP700X)	+= at32ap700x.o pm-at32ap700x.o
 obj-$(CONFIG_CPU_AT32AP700X)	+= time-tc.o
 obj-$(CONFIG_CPU_FREQ_AT32AP)	+= cpufreq.o

arch/avr32/mach-at32ap/pm-at32ap700x.S

@@ -0,0 +1,66 @@
+/*
+ * Low-level Power Management code.
+ *
+ * Copyright (C) 2008 Atmel Corporation
+ *
+ * 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.
+ */
+#include <asm/asm.h>
+#include <asm/asm-offsets.h>
+#include <asm/thread_info.h>
+#include <asm/arch/pm.h>
+
+	.section .bss, "wa", @nobits
+	.global	disable_idle_sleep
+	.type	disable_idle_sleep, @object
+disable_idle_sleep:
+	.int	4
+	.size	disable_idle_sleep, . - disable_idle_sleep
+
+	/* Keep this close to the irq handlers */
+	.section .irq.text, "ax", @progbits
+
+	/*
+	 * void cpu_enter_idle(void)
+	 *
+	 * Put the CPU into "idle" mode, in which it will consume
+	 * significantly less power.
+	 *
+	 * If an interrupt comes along in the window between
+	 * unmask_interrupts and the sleep instruction below, the
+	 * interrupt code will adjust the return address so that we
+	 * never execute the sleep instruction. This is required
+	 * because the AP7000 doesn't unmask interrupts when entering
+	 * sleep modes; later CPUs may not need this workaround.
+	 */
+	.global	cpu_enter_idle
+	.type	cpu_enter_idle, @function
+cpu_enter_idle:
+	mask_interrupts
+	get_thread_info r8
+	ld.w	r9, r8[TI_flags]
+	bld	r9, TIF_NEED_RESCHED
+	brcs	.Lret_from_sleep
+	sbr	r9, TIF_CPU_GOING_TO_SLEEP
+	st.w	r8[TI_flags], r9
+	unmask_interrupts
+	sleep	CPU_SLEEP_IDLE
+	.size	cpu_idle_sleep, . - cpu_idle_sleep
+
+	/*
+	 * Common return path for PM functions that don't run from
+	 * SRAM.
+	 */
+	.global cpu_idle_skip_sleep
+	.type	cpu_idle_skip_sleep, @function
+cpu_idle_skip_sleep:
+	mask_interrupts
+	ld.w	r9, r8[TI_flags]
+	cbr	r9, TIF_CPU_GOING_TO_SLEEP
+	st.w	r8[TI_flags], r9
+.Lret_from_sleep:
+	unmask_interrupts
+	retal	r12
+	.size	cpu_idle_skip_sleep, . - cpu_idle_skip_sleep

include/asm-avr32/arch-at32ap/pm.h

@@ -0,0 +1,48 @@
+/*
+ * AVR32 AP Power Management.
+ *
+ * Copyright (C) 2008 Atmel Corporation
+ *
+ * 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.
+ */
+#ifndef __ASM_AVR32_ARCH_PM_H
+#define __ASM_AVR32_ARCH_PM_H
+
+/* Possible arguments to the "sleep" instruction */
+#define CPU_SLEEP_IDLE		0
+#define CPU_SLEEP_FROZEN	1
+#define CPU_SLEEP_STANDBY	2
+#define CPU_SLEEP_STOP		3
+#define CPU_SLEEP_STATIC	5
+
+#ifndef __ASSEMBLY__
+extern void cpu_enter_idle(void);
+
+extern bool disable_idle_sleep;
+
+static inline void cpu_disable_idle_sleep(void)
+{
+	disable_idle_sleep = true;
+}
+
+static inline void cpu_enable_idle_sleep(void)
+{
+	disable_idle_sleep = false;
+}
+
+static inline void cpu_idle_sleep(void)
+{
+	/*
+	 * If we're using the COUNT and COMPARE registers for
+	 * timekeeping, we can't use the IDLE state.
+	 */
+	if (disable_idle_sleep)
+		cpu_relax();
+	else
+		cpu_enter_idle();
+}
+#endif
+
+#endif /* __ASM_AVR32_ARCH_PM_H */