diff options
Diffstat (limited to 'arch/mips/kernel/pm-cps.c')
| -rw-r--r-- | arch/mips/kernel/pm-cps.c | 160 |
1 files changed, 73 insertions, 87 deletions
diff --git a/arch/mips/kernel/pm-cps.c b/arch/mips/kernel/pm-cps.c index 5b31a9405ebc..7cf653e21423 100644 --- a/arch/mips/kernel/pm-cps.c +++ b/arch/mips/kernel/pm-cps.c @@ -8,6 +8,7 @@ * option) any later version. */ +#include <linux/cpuhotplug.h> #include <linux/init.h> #include <linux/percpu.h> #include <linux/slab.h> @@ -70,13 +71,8 @@ static DEFINE_PER_CPU_ALIGNED(atomic_t, pm_barrier); DEFINE_PER_CPU_ALIGNED(struct mips_static_suspend_state, cps_cpu_state); /* A somewhat arbitrary number of labels & relocs for uasm */ -static struct uasm_label labels[32] __initdata; -static struct uasm_reloc relocs[32] __initdata; - -/* CPU dependant sync types */ -static unsigned stype_intervention; -static unsigned stype_memory; -static unsigned stype_ordering; +static struct uasm_label labels[32]; +static struct uasm_reloc relocs[32]; enum mips_reg { zero, at, v0, v1, a0, a1, a2, a3, @@ -134,7 +130,7 @@ int cps_pm_enter_state(enum cps_pm_state state) return -EINVAL; /* Calculate which coupled CPUs (VPEs) are online */ -#ifdef CONFIG_MIPS_MT +#if defined(CONFIG_MIPS_MT) || defined(CONFIG_CPU_MIPSR6) if (cpu_online(cpu)) { cpumask_and(coupled_mask, cpu_online_mask, &cpu_sibling_map[cpu]); @@ -198,10 +194,10 @@ int cps_pm_enter_state(enum cps_pm_state state) return 0; } -static void __init cps_gen_cache_routine(u32 **pp, struct uasm_label **pl, - struct uasm_reloc **pr, - const struct cache_desc *cache, - unsigned op, int lbl) +static void cps_gen_cache_routine(u32 **pp, struct uasm_label **pl, + struct uasm_reloc **pr, + const struct cache_desc *cache, + unsigned op, int lbl) { unsigned cache_size = cache->ways << cache->waybit; unsigned i; @@ -242,10 +238,10 @@ static void __init cps_gen_cache_routine(u32 **pp, struct uasm_label **pl, uasm_i_nop(pp); } -static int __init cps_gen_flush_fsb(u32 **pp, struct uasm_label **pl, - struct uasm_reloc **pr, - const struct cpuinfo_mips *cpu_info, - int lbl) +static int cps_gen_flush_fsb(u32 **pp, struct uasm_label **pl, + struct uasm_reloc **pr, + const struct cpuinfo_mips *cpu_info, + int lbl) { unsigned i, fsb_size = 8; unsigned num_loads = (fsb_size * 3) / 2; @@ -272,14 +268,9 @@ static int __init cps_gen_flush_fsb(u32 **pp, struct uasm_label **pl, /* On older ones it's unavailable */ return -1; - /* CPUs which do not require the workaround */ - case CPU_P5600: - case CPU_I6400: - return 0; - default: - WARN_ONCE(1, "pm-cps: FSB flush unsupported for this CPU\n"); - return -1; + /* Assume that the CPU does not need this workaround */ + return 0; } /* @@ -320,8 +311,8 @@ static int __init cps_gen_flush_fsb(u32 **pp, struct uasm_label **pl, i * line_size * line_stride, t0); } - /* Completion barrier */ - uasm_i_sync(pp, stype_memory); + /* Barrier ensuring previous cache invalidates are complete */ + uasm_i_sync(pp, STYPE_SYNC); uasm_i_ehb(pp); /* Check whether the pipeline stalled due to the FSB being full */ @@ -340,9 +331,9 @@ static int __init cps_gen_flush_fsb(u32 **pp, struct uasm_label **pl, return 0; } -static void __init cps_gen_set_top_bit(u32 **pp, struct uasm_label **pl, - struct uasm_reloc **pr, - unsigned r_addr, int lbl) +static void cps_gen_set_top_bit(u32 **pp, struct uasm_label **pl, + struct uasm_reloc **pr, + unsigned r_addr, int lbl) { uasm_i_lui(pp, t0, uasm_rel_hi(0x80000000)); uasm_build_label(pl, *pp, lbl); @@ -353,7 +344,7 @@ static void __init cps_gen_set_top_bit(u32 **pp, struct uasm_label **pl, uasm_i_nop(pp); } -static void * __init cps_gen_entry_code(unsigned cpu, enum cps_pm_state state) +static void *cps_gen_entry_code(unsigned cpu, enum cps_pm_state state) { struct uasm_label *l = labels; struct uasm_reloc *r = relocs; @@ -411,7 +402,7 @@ static void * __init cps_gen_entry_code(unsigned cpu, enum cps_pm_state state) if (coupled_coherence) { /* Increment ready_count */ - uasm_i_sync(&p, stype_ordering); + uasm_i_sync(&p, STYPE_SYNC_MB); uasm_build_label(&l, p, lbl_incready); uasm_i_ll(&p, t1, 0, r_nc_count); uasm_i_addiu(&p, t2, t1, 1); @@ -419,8 +410,8 @@ static void * __init cps_gen_entry_code(unsigned cpu, enum cps_pm_state state) uasm_il_beqz(&p, &r, t2, lbl_incready); uasm_i_addiu(&p, t1, t1, 1); - /* Ordering barrier */ - uasm_i_sync(&p, stype_ordering); + /* Barrier ensuring all CPUs see the updated r_nc_count value */ + uasm_i_sync(&p, STYPE_SYNC_MB); /* * If this is the last VPE to become ready for non-coherence @@ -441,7 +432,8 @@ static void * __init cps_gen_entry_code(unsigned cpu, enum cps_pm_state state) uasm_i_lw(&p, t0, 0, r_nc_count); uasm_il_bltz(&p, &r, t0, lbl_secondary_cont); uasm_i_ehb(&p); - uasm_i_yield(&p, zero, t1); + if (cpu_has_mipsmt) + uasm_i_yield(&p, zero, t1); uasm_il_b(&p, &r, lbl_poll_cont); uasm_i_nop(&p); } else { @@ -449,8 +441,21 @@ static void * __init cps_gen_entry_code(unsigned cpu, enum cps_pm_state state) * The core will lose power & this VPE will not continue * so it can simply halt here. */ - uasm_i_addiu(&p, t0, zero, TCHALT_H); - uasm_i_mtc0(&p, t0, 2, 4); + if (cpu_has_mipsmt) { + /* Halt the VPE via C0 tchalt register */ + uasm_i_addiu(&p, t0, zero, TCHALT_H); + uasm_i_mtc0(&p, t0, 2, 4); + } else if (cpu_has_vp) { + /* Halt the VP via the CPC VP_STOP register */ + unsigned int vpe_id; + + vpe_id = cpu_vpe_id(&cpu_data[cpu]); + uasm_i_addiu(&p, t0, zero, 1 << vpe_id); + UASM_i_LA(&p, t1, (long)addr_cpc_cl_vp_stop()); + uasm_i_sw(&p, t0, 0, t1); + } else { + BUG(); + } uasm_build_label(&l, p, lbl_secondary_hang); uasm_il_b(&p, &r, lbl_secondary_hang); uasm_i_nop(&p); @@ -472,22 +477,24 @@ static void * __init cps_gen_entry_code(unsigned cpu, enum cps_pm_state state) cps_gen_cache_routine(&p, &l, &r, &cpu_data[cpu].dcache, Index_Writeback_Inv_D, lbl_flushdcache); - /* Completion barrier */ - uasm_i_sync(&p, stype_memory); + /* Barrier ensuring previous cache invalidates are complete */ + uasm_i_sync(&p, STYPE_SYNC); uasm_i_ehb(&p); - /* - * Disable all but self interventions. The load from COHCTL is defined - * by the interAptiv & proAptiv SUMs as ensuring that the operation - * resulting from the preceding store is complete. - */ - uasm_i_addiu(&p, t0, zero, 1 << cpu_data[cpu].core); - uasm_i_sw(&p, t0, 0, r_pcohctl); - uasm_i_lw(&p, t0, 0, r_pcohctl); - - /* Sync to ensure previous interventions are complete */ - uasm_i_sync(&p, stype_intervention); - uasm_i_ehb(&p); + if (mips_cm_revision() < CM_REV_CM3) { + /* + * Disable all but self interventions. The load from COHCTL is + * defined by the interAptiv & proAptiv SUMs as ensuring that the + * operation resulting from the preceding store is complete. + */ + uasm_i_addiu(&p, t0, zero, 1 << cpu_data[cpu].core); + uasm_i_sw(&p, t0, 0, r_pcohctl); + uasm_i_lw(&p, t0, 0, r_pcohctl); + + /* Barrier to ensure write to coherence control is complete */ + uasm_i_sync(&p, STYPE_SYNC); + uasm_i_ehb(&p); + } /* Disable coherence */ uasm_i_sw(&p, zero, 0, r_pcohctl); @@ -531,8 +538,8 @@ static void * __init cps_gen_entry_code(unsigned cpu, enum cps_pm_state state) goto gen_done; } - /* Completion barrier */ - uasm_i_sync(&p, stype_memory); + /* Barrier to ensure write to CPC command is complete */ + uasm_i_sync(&p, STYPE_SYNC); uasm_i_ehb(&p); } @@ -562,26 +569,29 @@ static void * __init cps_gen_entry_code(unsigned cpu, enum cps_pm_state state) * will run this. The first will actually re-enable coherence & the * rest will just be performing a rather unusual nop. */ - uasm_i_addiu(&p, t0, zero, CM_GCR_Cx_COHERENCE_COHDOMAINEN_MSK); + uasm_i_addiu(&p, t0, zero, mips_cm_revision() < CM_REV_CM3 + ? CM_GCR_Cx_COHERENCE_COHDOMAINEN_MSK + : CM3_GCR_Cx_COHERENCE_COHEN_MSK); + uasm_i_sw(&p, t0, 0, r_pcohctl); uasm_i_lw(&p, t0, 0, r_pcohctl); - /* Completion barrier */ - uasm_i_sync(&p, stype_memory); + /* Barrier to ensure write to coherence control is complete */ + uasm_i_sync(&p, STYPE_SYNC); uasm_i_ehb(&p); if (coupled_coherence && (state == CPS_PM_NC_WAIT)) { /* Decrement ready_count */ uasm_build_label(&l, p, lbl_decready); - uasm_i_sync(&p, stype_ordering); + uasm_i_sync(&p, STYPE_SYNC_MB); uasm_i_ll(&p, t1, 0, r_nc_count); uasm_i_addiu(&p, t2, t1, -1); uasm_i_sc(&p, t2, 0, r_nc_count); uasm_il_beqz(&p, &r, t2, lbl_decready); uasm_i_andi(&p, v0, t1, (1 << fls(smp_num_siblings)) - 1); - /* Ordering barrier */ - uasm_i_sync(&p, stype_ordering); + /* Barrier ensuring all CPUs see the updated r_nc_count value */ + uasm_i_sync(&p, STYPE_SYNC_MB); } if (coupled_coherence && (state == CPS_PM_CLOCK_GATED)) { @@ -602,8 +612,8 @@ static void * __init cps_gen_entry_code(unsigned cpu, enum cps_pm_state state) */ uasm_build_label(&l, p, lbl_secondary_cont); - /* Ordering barrier */ - uasm_i_sync(&p, stype_ordering); + /* Barrier ensuring all CPUs see the updated r_nc_count value */ + uasm_i_sync(&p, STYPE_SYNC_MB); } /* The core is coherent, time to return to C code */ @@ -628,7 +638,7 @@ out_err: return NULL; } -static int __init cps_gen_core_entries(unsigned cpu) +static int cps_pm_online_cpu(unsigned int cpu) { enum cps_pm_state state; unsigned core = cpu_data[cpu].core; @@ -670,29 +680,10 @@ static int __init cps_gen_core_entries(unsigned cpu) static int __init cps_pm_init(void) { - unsigned cpu; - int err; - - /* Detect appropriate sync types for the system */ - switch (current_cpu_data.cputype) { - case CPU_INTERAPTIV: - case CPU_PROAPTIV: - case CPU_M5150: - case CPU_P5600: - case CPU_I6400: - stype_intervention = 0x2; - stype_memory = 0x3; - stype_ordering = 0x10; - break; - - default: - pr_warn("Power management is using heavyweight sync 0\n"); - } - /* A CM is required for all non-coherent states */ if (!mips_cm_present()) { pr_warn("pm-cps: no CM, non-coherent states unavailable\n"); - goto out; + return 0; } /* @@ -722,12 +713,7 @@ static int __init cps_pm_init(void) pr_warn("pm-cps: no CPC, clock & power gating unavailable\n"); } - for_each_present_cpu(cpu) { - err = cps_gen_core_entries(cpu); - if (err) - return err; - } -out: - return 0; + return cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "AP_PM_CPS_CPU_ONLINE", + cps_pm_online_cpu, NULL); } arch_initcall(cps_pm_init); |