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powerpc/85xx: add hardware automatically enter altivec idle state 

Each core's AltiVec unit may be placed into a power savings mode
by turning off power to the unit. Core hardware will automatically
power down the AltiVec unit after no AltiVec instructions have
executed in N cycles. The AltiVec power-control is triggered by hardware.

Signed-off-by: Wang Dongsheng <dongsheng.wang@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
Wang Dongsheng 2013-12-17 16:17:00 +08:00 committed by Scott Wood
parent 71a6fa17e1
commit 202e059ce3
1 changed files with 21 additions and 0 deletions
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21
arch/powerpc/kernel/cpu_setup_fsl_booke.S
View File

@ -53,6 +53,25 @@ _GLOBAL(__e500_dcache_setup)
isync
blr
/*
* FIXME - we haven't yet done testing to determine a reasonable default
* value for AV_WAIT_IDLE_BIT.
*/
#define AV_WAIT_IDLE_BIT 50 /* 1ms, TB frequency is 41.66MHZ */
_GLOBAL(setup_altivec_idle)
mfspr r3, SPRN_PWRMGTCR0
/* Enable Altivec Idle */
oris r3, r3, PWRMGTCR0_AV_IDLE_PD_EN@h
li r11, AV_WAIT_IDLE_BIT
/* Set Automatic AltiVec Idle Count */
rlwimi r3, r11, PWRMGTCR0_AV_IDLE_CNT_SHIFT, PWRMGTCR0_AV_IDLE_CNT
mtspr SPRN_PWRMGTCR0, r3
blr
_GLOBAL(__setup_cpu_e6500)
mflr r6
#ifdef CONFIG_PPC64
@ -64,6 +83,7 @@ _GLOBAL(__setup_cpu_e6500)
bl .setup_lrat_ivor
1:
#endif
bl setup_altivec_idle
bl __setup_cpu_e5500
mtlr r6
blr
@ -131,6 +151,7 @@ _GLOBAL(__restore_cpu_e6500)
beq 1f
bl .setup_lrat_ivor
1:
bl .setup_altivec_idle
bl __restore_cpu_e5500
mtlr r5
blr