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| author | Nicholas Piggin <npiggin@gmail.com> | 2017-09-14 21:13:46 +1000 |
|---|---|---|
| committer | Stewart Smith <stewart@linux.vnet.ibm.com> | 2017-09-28 00:30:02 -0500 |
| commit | cca6c3408711a8971dfc8c3331d381741012775f (patch) | |
| tree | 77604854989d034b1a8991d455da5f80d3559b82 /asm | |
| parent | ab101cb041a985f99c9e05977d4d43ad4baaeef8 (diff) | |
| download | skiboot-cca6c3408711a8971dfc8c3331d381741012775f.zip skiboot-cca6c3408711a8971dfc8c3331d381741012775f.tar.gz skiboot-cca6c3408711a8971dfc8c3331d381741012775f.tar.bz2 | |
cpu: idle POWER9 power management implementation
Add pm idle support to POWER9. IPIs are implemented with doorbells.
POWER9 can use the EC=ESL=0 (lite) stop when sreset is not available.
EC=ESL=1 state with RL=3 is enabled when we have a sreset wakeup.
Deep idle states are not implemented.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Diffstat (limited to 'asm')
| -rw-r--r-- | asm/head.S | 70 |
1 files changed, 49 insertions, 21 deletions
@@ -28,6 +28,8 @@ #define PPC_INST_SLEEP .long 0x4c0003a4 #define PPC_INST_RVWINKLE .long 0x4c0003e4 +#define PPC_INST_STOP .long 0x4c0002e4 + #define GET_STACK(stack_reg,pir_reg) \ sldi stack_reg,pir_reg,STACK_SHIFT; \ addis stack_reg,stack_reg,CPU_STACKS_OFFSET@ha; \ @@ -471,27 +473,7 @@ call_relocate: .long 0xa6037b7d; /* mtsrr1 r11 */ \ .long 0x2400004c /* rfid */ -.global enter_pm_state -enter_pm_state: - /* Before entering map or rvwinkle, we create a stack frame - * and save our non-volatile registers. - * - * We also save these SPRs: - * - * - HSPRG0 in GPR0 slot - * - HSPRG1 in GPR1 slot - * - * - xxx TODO: HIDs - * - TODO: Mask MSR:ME during the process - * - * On entry, r3 indicates: - * - * 0 = nap - * 1 = rvwinkle - */ - mflr %r0 - std %r0,16(%r1) - stdu %r1,-STACK_FRAMESIZE(%r1) +pm_save_regs: SAVE_GPR(2,%r1) SAVE_GPR(14,%r1) SAVE_GPR(15,%r1) @@ -519,6 +501,31 @@ enter_pm_state: stw %r5,STACK_XER(%r1) std %r6,STACK_GPR0(%r1) std %r7,STACK_GPR1(%r1) + blr + +.global enter_p8_pm_state +enter_p8_pm_state: + /* Before entering map or rvwinkle, we create a stack frame + * and save our non-volatile registers. + * + * We also save these SPRs: + * + * - HSPRG0 in GPR0 slot + * - HSPRG1 in GPR1 slot + * + * - xxx TODO: HIDs + * - TODO: Mask MSR:ME during the process + * + * On entry, r3 indicates: + * + * 0 = nap + * 1 = rvwinkle + */ + mflr %r0 + std %r0,16(%r1) + stdu %r1,-STACK_FRAMESIZE(%r1) + + bl pm_save_regs /* Save stack pointer in struct cpu_thread */ std %r1,CPUTHREAD_SAVE_R1(%r13) @@ -543,6 +550,27 @@ enter_pm_state: PPC_INST_RVWINKLE b . +.global enter_p9_pm_lite_state +enter_p9_pm_lite_state: + mtspr SPR_PSSCR,%r3 + PPC_INST_STOP + blr + +.global enter_p9_pm_state +enter_p9_pm_state: + mflr %r0 + std %r0,16(%r1) + stdu %r1,-STACK_FRAMESIZE(%r1) + + bl pm_save_regs + + /* Save stack pointer in struct cpu_thread */ + std %r1,CPUTHREAD_SAVE_R1(%r13) + + mtspr SPR_PSSCR,%r3 + PPC_INST_STOP + b . + /* This is a little piece of code that is copied down to * 0x100 for handling power management wakeups */ |