diff options
Diffstat (limited to 'arch/powerpc/platforms/pasemi/powersave.S')
| -rw-r--r-- | arch/powerpc/platforms/pasemi/powersave.S | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pasemi/powersave.S b/arch/powerpc/platforms/pasemi/powersave.S new file mode 100644 index 000000000..d0215d532 --- /dev/null +++ b/arch/powerpc/platforms/pasemi/powersave.S @@ -0,0 +1,76 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2006-2007 PA Semi, Inc + * + * Maintained by: Olof Johansson <olof@lixom.net> + */ + +#include <asm/processor.h> +#include <asm/page.h> +#include <asm/ppc_asm.h> +#include <asm/cputable.h> +#include <asm/cache.h> +#include <asm/thread_info.h> +#include <asm/asm-offsets.h> + +/* Power savings opcodes since not all binutils have them at this time */ +#define DOZE .long 0x4c000324 +#define NAP .long 0x4c000364 +#define SLEEP .long 0x4c0003a4 +#define RVW .long 0x4c0003e4 + +/* Common sequence to do before going to any of the + * powersavings modes. + */ + +#define PRE_SLEEP_SEQUENCE \ + std r3,8(r1); \ + ptesync ; \ + ld r3,8(r1); \ +1: cmpd r3,r3; \ + bne 1b + +_doze: + PRE_SLEEP_SEQUENCE + DOZE + b . + + +_GLOBAL(idle_spin) + blr + +_GLOBAL(idle_doze) + LOAD_REG_ADDR(r3, _doze) + b sleep_common + +/* Add more modes here later */ + +sleep_common: + mflr r0 + std r0, 16(r1) + stdu r1,-64(r1) +#ifdef CONFIG_PPC_PASEMI_CPUFREQ + std r3, 48(r1) + + /* Only do power savings when in astate 0 */ + bl check_astate + cmpwi r3,0 + bne 1f + + ld r3, 48(r1) +#endif + LOAD_REG_IMMEDIATE(r6,MSR_DR|MSR_IR|MSR_ME|MSR_EE) + mfmsr r4 + andc r5,r4,r6 + mtmsrd r5,0 + + mtctr r3 + bctrl + + mtmsrd r4,0 + +1: addi r1,r1,64 + ld r0,16(r1) + mtlr r0 + blr + |