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powerpc/85xx: add hardware automatically enter pw20 state 

Using hardware features make core automatically enter PW20 state.
Set a TB count to hardware, the effective count begins when PW10
is entered. When the effective period has expired, the core will
proceed from PW10 to PW20 if no exit conditions have occurred during
the period.

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 16:17:01 +08:00 committed by Scott Wood
parent 202e059ce3
commit 1d47ddf7c3
1 changed files with 21 additions and 0 deletions
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21
arch/powerpc/kernel/cpu_setup_fsl_booke.S
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@ -53,6 +53,25 @@ _GLOBAL(__e500_dcache_setup)
isync
blr
/*
* FIXME - we haven't yet done testing to determine a reasonable default
* value for PW20_WAIT_IDLE_BIT.
*/
#define PW20_WAIT_IDLE_BIT 50 /* 1ms, TB frequency is 41.66MHZ */
_GLOBAL(setup_pw20_idle)
mfspr r3, SPRN_PWRMGTCR0
/* Set PW20_WAIT bit, enable pw20 state*/
ori r3, r3, PWRMGTCR0_PW20_WAIT
li r11, PW20_WAIT_IDLE_BIT
/* Set Automatic PW20 Core Idle Count */
rlwimi r3, r11, PWRMGTCR0_PW20_ENT_SHIFT, PWRMGTCR0_PW20_ENT
mtspr SPRN_PWRMGTCR0, r3
blr
/*
* FIXME - we haven't yet done testing to determine a reasonable default
* value for AV_WAIT_IDLE_BIT.
@ -83,6 +102,7 @@ _GLOBAL(__setup_cpu_e6500)
bl .setup_lrat_ivor
1:
#endif
bl setup_pw20_idle
bl setup_altivec_idle
bl __setup_cpu_e5500
mtlr r6
@ -151,6 +171,7 @@ _GLOBAL(__restore_cpu_e6500)
beq 1f
bl .setup_lrat_ivor
1:
bl .setup_pw20_idle
bl .setup_altivec_idle
bl __restore_cpu_e5500
mtlr r5