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>

5 files changed, 117 insertions, 23 deletions

diff --git a/arch/avr32/kernel/entry-avr32b.S b/arch/avr32/kernel/entry-avr32b.S
index 8cf16d7a7040..5f31702d6b1c 100644
--- a/arch/avr32/kernel/entry-avr32b.S
+++ b/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
diff --git a/arch/avr32/kernel/process.c b/arch/avr32/kernel/process.c
index 7f4af0b1e111..3de115462d7b 100644
--- a/arch/avr32/kernel/process.c
+++ b/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..
  */
diff --git a/arch/avr32/mach-at32ap/Makefile b/arch/avr32/mach-at32ap/Makefile
index 5e9f8217befc..83cab2abb6c3 100644
--- a/arch/avr32/mach-at32ap/Makefile
+++ b/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
diff --git a/arch/avr32/mach-at32ap/pm-at32ap700x.S b/arch/avr32/mach-at32ap/pm-at32ap700x.S
new file mode 100644
index 000000000000..949e2485e278
--- /dev/null
+++ b/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
diff --git a/include/asm-avr32/arch-at32ap/pm.h b/include/asm-avr32/arch-at32ap/pm.h
new file mode 100644
index 000000000000..356e43064903
--- /dev/null
+++ b/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 */