diff options
Diffstat (limited to 'kernel/arch/blackfin/mach-bf609/dpm.S')
| -rw-r--r-- | kernel/arch/blackfin/mach-bf609/dpm.S | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/kernel/arch/blackfin/mach-bf609/dpm.S b/kernel/arch/blackfin/mach-bf609/dpm.S new file mode 100644 index 000000000..54d50c689 --- /dev/null +++ b/kernel/arch/blackfin/mach-bf609/dpm.S @@ -0,0 +1,157 @@ +#include <linux/linkage.h> +#include <asm/blackfin.h> +#include <asm/dpmc.h> + +#include <asm/context.S> + +#define PM_STACK (COREA_L1_SCRATCH_START + L1_SCRATCH_LENGTH - 12) + +.section .l1.text +ENTRY(_enter_hibernate) + /* switch stack to L1 scratch, prepare for ddr srfr */ + P0.H = HI(PM_STACK); + P0.L = LO(PM_STACK); + SP = P0; + + call _bf609_ddr_sr; + call _bfin_hibernate_syscontrol; + + P0.H = HI(DPM0_RESTORE4); + P0.L = LO(DPM0_RESTORE4); + P1.H = _bf609_pm_data; + P1.L = _bf609_pm_data; + [P0] = P1; + + P0.H = HI(DPM0_CTL); + P0.L = LO(DPM0_CTL); + R3.H = HI(0x00000010); + R3.L = LO(0x00000010); + + bfin_init_pm_bench_cycles; + + [P0] = R3; + + SSYNC; +ENDPROC(_enter_hibernate) + +/* DPM wake up interrupt won't wake up core on bf60x if its core IMASK + * is disabled. This behavior differ from bf5xx serial processor. + */ +ENTRY(_dummy_deepsleep) + [--sp] = SYSCFG; + [--sp] = (R7:0,P5:0); + cli r0; + + /* get wake up interrupt ID */ + P0.l = LO(SEC_SCI_BASE + SEC_CSID); + P0.h = HI(SEC_SCI_BASE + SEC_CSID); + R0 = [P0]; + + /* ACK wake up interrupt in SEC */ + P1.l = LO(SEC_END); + P1.h = HI(SEC_END); + + [P1] = R0; + SSYNC; + + /* restore EVT 11 entry */ + p0.h = hi(EVT11); + p0.l = lo(EVT11); + p1.h = _evt_evt11; + p1.l = _evt_evt11; + + [p0] = p1; + SSYNC; + + (R7:0,P5:0) = [sp++]; + SYSCFG = [sp++]; + RTI; +ENDPROC(_dummy_deepsleep) + +ENTRY(_enter_deepsleep) + LINK 0xC; + [--sp] = (R7:0,P5:0); + + /* Change EVT 11 entry to dummy handler for wake up event */ + p0.h = hi(EVT11); + p0.l = lo(EVT11); + p1.h = _dummy_deepsleep; + p1.l = _dummy_deepsleep; + + [p0] = p1; + + P0.H = HI(PM_STACK); + P0.L = LO(PM_STACK); + + EX_SCRATCH_REG = SP; + SP = P0; + + SSYNC; + + /* should put ddr to self refresh mode before sleep */ + call _bf609_ddr_sr; + + /* Set DPM controller to deep sleep mode */ + P0.H = HI(DPM0_CTL); + P0.L = LO(DPM0_CTL); + R3.H = HI(0x00000008); + R3.L = LO(0x00000008); + [P0] = R3; + CSYNC; + + /* Enable evt 11 in IMASK before idle, otherwise core doesn't wake up. */ + r0.l = 0x800; + r0.h = 0; + sti r0; + SSYNC; + + bfin_init_pm_bench_cycles; + + /* Fall into deep sleep in idle*/ + idle; + SSYNC; + + /* Restore PLL after wake up from deep sleep */ + call _bf609_resume_ccbuf; + + /* turn ddr out of self refresh mode */ + call _bf609_ddr_sr_exit; + + SP = EX_SCRATCH_REG; + + (R7:0,P5:0) = [SP++]; + UNLINK; + RTS; +ENDPROC(_enter_deepsleep) + +.section .text +ENTRY(_bf609_hibernate) + bfin_cpu_reg_save; + bfin_core_mmr_save; + + P0.H = _bf609_pm_data; + P0.L = _bf609_pm_data; + R1.H = 0xDEAD; + R1.L = 0xBEEF; + R2.H = .Lpm_resume_here; + R2.L = .Lpm_resume_here; + [P0++] = R1; + [P0++] = R2; + [P0++] = SP; + + P1.H = _enter_hibernate; + P1.L = _enter_hibernate; + + call (P1); +.Lpm_resume_here: + + bfin_core_mmr_restore; + bfin_cpu_reg_restore; + + [--sp] = RETI; /* Clear Global Interrupt Disable */ + SP += 4; + + RTS; + +ENDPROC(_bf609_hibernate) + |