| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| * Copyright (C) 2013 Imagination Technologies |
| * Author: Paul Burton <paul.burton@mips.com> |
| */ |
| |
| #include <linux/init.h> |
| #include <asm/addrspace.h> |
| #include <asm/asm.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/asmmacro.h> |
| #include <asm/cacheops.h> |
| #include <asm/eva.h> |
| #include <asm/mipsregs.h> |
| #include <asm/mipsmtregs.h> |
| #include <asm/pm.h> |
| #include <asm/smp-cps.h> |
| |
| #define GCR_CPC_BASE_OFS 0x0088 |
| #define GCR_CL_COHERENCE_OFS 0x2008 |
| #define GCR_CL_ID_OFS 0x2028 |
| |
| #define CPC_CL_VC_STOP_OFS 0x2020 |
| #define CPC_CL_VC_RUN_OFS 0x2028 |
| |
| .extern mips_cm_base |
| |
| .set noreorder |
| |
| #ifdef CONFIG_64BIT |
| # define STATUS_BITDEPS ST0_KX |
| #else |
| # define STATUS_BITDEPS 0 |
| #endif |
| |
| #ifdef CONFIG_MIPS_CPS_NS16550 |
| |
| #define DUMP_EXCEP(name) \ |
| PTR_LA a0, 8f; \ |
| jal mips_cps_bev_dump; \ |
| nop; \ |
| TEXT(name) |
| |
| #else /* !CONFIG_MIPS_CPS_NS16550 */ |
| |
| #define DUMP_EXCEP(name) |
| |
| #endif /* !CONFIG_MIPS_CPS_NS16550 */ |
| |
| /* |
| * Set dest to non-zero if the core supports the MT ASE, else zero. If |
| * MT is not supported then branch to nomt. |
| */ |
| .macro has_mt dest, nomt |
| mfc0 \dest, CP0_CONFIG, 1 |
| bgez \dest, \nomt |
| mfc0 \dest, CP0_CONFIG, 2 |
| bgez \dest, \nomt |
| mfc0 \dest, CP0_CONFIG, 3 |
| andi \dest, \dest, MIPS_CONF3_MT |
| beqz \dest, \nomt |
| nop |
| .endm |
| |
| /* |
| * Set dest to non-zero if the core supports MIPSr6 multithreading |
| * (ie. VPs), else zero. If MIPSr6 multithreading is not supported then |
| * branch to nomt. |
| */ |
| .macro has_vp dest, nomt |
| mfc0 \dest, CP0_CONFIG, 1 |
| bgez \dest, \nomt |
| mfc0 \dest, CP0_CONFIG, 2 |
| bgez \dest, \nomt |
| mfc0 \dest, CP0_CONFIG, 3 |
| bgez \dest, \nomt |
| mfc0 \dest, CP0_CONFIG, 4 |
| bgez \dest, \nomt |
| mfc0 \dest, CP0_CONFIG, 5 |
| andi \dest, \dest, MIPS_CONF5_VP |
| beqz \dest, \nomt |
| nop |
| .endm |
| |
| |
| LEAF(mips_cps_core_boot) |
| /* Save CCA and GCR base */ |
| move s0, a0 |
| move s1, a1 |
| |
| /* We don't know how to do coherence setup on earlier ISA */ |
| #if MIPS_ISA_REV > 0 |
| /* Skip cache & coherence setup if we're already coherent */ |
| lw s7, GCR_CL_COHERENCE_OFS(s1) |
| bnez s7, 1f |
| nop |
| |
| /* Initialize the L1 caches */ |
| jal mips_cps_cache_init |
| nop |
| |
| /* Enter the coherent domain */ |
| li t0, 0xff |
| sw t0, GCR_CL_COHERENCE_OFS(s1) |
| ehb |
| #endif /* MIPS_ISA_REV > 0 */ |
| |
| /* Set Kseg0 CCA to that in s0 */ |
| 1: mfc0 t0, CP0_CONFIG |
| ori t0, 0x7 |
| xori t0, 0x7 |
| or t0, t0, s0 |
| mtc0 t0, CP0_CONFIG |
| ehb |
| |
| /* Jump to kseg0 */ |
| PTR_LA t0, 1f |
| jr t0 |
| nop |
| |
| /* |
| * We're up, cached & coherent. Perform any EVA initialization necessary |
| * before we access memory. |
| */ |
| 1: eva_init |
| |
| /* Retrieve boot configuration pointers */ |
| jal mips_cps_get_bootcfg |
| nop |
| |
| /* Skip core-level init if we started up coherent */ |
| bnez s7, 1f |
| nop |
| |
| /* Perform any further required core-level initialisation */ |
| jal mips_cps_core_init |
| nop |
| |
| /* |
| * Boot any other VPEs within this core that should be online, and |
| * deactivate this VPE if it should be offline. |
| */ |
| move a1, t9 |
| jal mips_cps_boot_vpes |
| move a0, v0 |
| |
| /* Off we go! */ |
| 1: PTR_L t1, VPEBOOTCFG_PC(v1) |
| PTR_L gp, VPEBOOTCFG_GP(v1) |
| PTR_L sp, VPEBOOTCFG_SP(v1) |
| jr t1 |
| nop |
| END(mips_cps_core_boot) |
| |
| __INIT |
| LEAF(excep_tlbfill) |
| DUMP_EXCEP("TLB Fill") |
| b . |
| nop |
| END(excep_tlbfill) |
| |
| LEAF(excep_xtlbfill) |
| DUMP_EXCEP("XTLB Fill") |
| b . |
| nop |
| END(excep_xtlbfill) |
| |
| LEAF(excep_cache) |
| DUMP_EXCEP("Cache") |
| b . |
| nop |
| END(excep_cache) |
| |
| LEAF(excep_genex) |
| DUMP_EXCEP("General") |
| b . |
| nop |
| END(excep_genex) |
| |
| LEAF(excep_intex) |
| DUMP_EXCEP("Interrupt") |
| b . |
| nop |
| END(excep_intex) |
| |
| LEAF(excep_ejtag) |
| PTR_LA k0, ejtag_debug_handler |
| jr k0 |
| nop |
| END(excep_ejtag) |
| __FINIT |
| |
| LEAF(mips_cps_core_init) |
| #ifdef CONFIG_MIPS_MT_SMP |
| /* Check that the core implements the MT ASE */ |
| has_mt t0, 3f |
| |
| .set push |
| .set MIPS_ISA_LEVEL_RAW |
| .set mt |
| |
| /* Only allow 1 TC per VPE to execute... */ |
| dmt |
| |
| /* ...and for the moment only 1 VPE */ |
| dvpe |
| PTR_LA t1, 1f |
| jr.hb t1 |
| nop |
| |
| /* Enter VPE configuration state */ |
| 1: mfc0 t0, CP0_MVPCONTROL |
| ori t0, t0, MVPCONTROL_VPC |
| mtc0 t0, CP0_MVPCONTROL |
| |
| /* Retrieve the number of VPEs within the core */ |
| mfc0 t0, CP0_MVPCONF0 |
| srl t0, t0, MVPCONF0_PVPE_SHIFT |
| andi t0, t0, (MVPCONF0_PVPE >> MVPCONF0_PVPE_SHIFT) |
| addiu ta3, t0, 1 |
| |
| /* If there's only 1, we're done */ |
| beqz t0, 2f |
| nop |
| |
| /* Loop through each VPE within this core */ |
| li ta1, 1 |
| |
| 1: /* Operate on the appropriate TC */ |
| mtc0 ta1, CP0_VPECONTROL |
| ehb |
| |
| /* Bind TC to VPE (1:1 TC:VPE mapping) */ |
| mttc0 ta1, CP0_TCBIND |
| |
| /* Set exclusive TC, non-active, master */ |
| li t0, VPECONF0_MVP |
| sll t1, ta1, VPECONF0_XTC_SHIFT |
| or t0, t0, t1 |
| mttc0 t0, CP0_VPECONF0 |
| |
| /* Set TC non-active, non-allocatable */ |
| mttc0 zero, CP0_TCSTATUS |
| |
| /* Set TC halted */ |
| li t0, TCHALT_H |
| mttc0 t0, CP0_TCHALT |
| |
| /* Next VPE */ |
| addiu ta1, ta1, 1 |
| slt t0, ta1, ta3 |
| bnez t0, 1b |
| nop |
| |
| /* Leave VPE configuration state */ |
| 2: mfc0 t0, CP0_MVPCONTROL |
| xori t0, t0, MVPCONTROL_VPC |
| mtc0 t0, CP0_MVPCONTROL |
| |
| 3: .set pop |
| #endif |
| jr ra |
| nop |
| END(mips_cps_core_init) |
| |
| /** |
| * mips_cps_get_bootcfg() - retrieve boot configuration pointers |
| * |
| * Returns: pointer to struct core_boot_config in v0, pointer to |
| * struct vpe_boot_config in v1, VPE ID in t9 |
| */ |
| LEAF(mips_cps_get_bootcfg) |
| /* Calculate a pointer to this cores struct core_boot_config */ |
| lw t0, GCR_CL_ID_OFS(s1) |
| li t1, COREBOOTCFG_SIZE |
| mul t0, t0, t1 |
| PTR_LA t1, mips_cps_core_bootcfg |
| PTR_L t1, 0(t1) |
| PTR_ADDU v0, t0, t1 |
| |
| /* Calculate this VPEs ID. If the core doesn't support MT use 0 */ |
| li t9, 0 |
| #if defined(CONFIG_CPU_MIPSR6) |
| has_vp ta2, 1f |
| |
| /* |
| * Assume non-contiguous numbering. Perhaps some day we'll need |
| * to handle contiguous VP numbering, but no such systems yet |
| * exist. |
| */ |
| mfc0 t9, CP0_GLOBALNUMBER |
| andi t9, t9, MIPS_GLOBALNUMBER_VP |
| #elif defined(CONFIG_MIPS_MT_SMP) |
| has_mt ta2, 1f |
| |
| /* Find the number of VPEs present in the core */ |
| mfc0 t1, CP0_MVPCONF0 |
| srl t1, t1, MVPCONF0_PVPE_SHIFT |
| andi t1, t1, MVPCONF0_PVPE >> MVPCONF0_PVPE_SHIFT |
| addiu t1, t1, 1 |
| |
| /* Calculate a mask for the VPE ID from EBase.CPUNum */ |
| clz t1, t1 |
| li t2, 31 |
| subu t1, t2, t1 |
| li t2, 1 |
| sll t1, t2, t1 |
| addiu t1, t1, -1 |
| |
| /* Retrieve the VPE ID from EBase.CPUNum */ |
| mfc0 t9, $15, 1 |
| and t9, t9, t1 |
| #endif |
| |
| 1: /* Calculate a pointer to this VPEs struct vpe_boot_config */ |
| li t1, VPEBOOTCFG_SIZE |
| mul v1, t9, t1 |
| PTR_L ta3, COREBOOTCFG_VPECONFIG(v0) |
| PTR_ADDU v1, v1, ta3 |
| |
| jr ra |
| nop |
| END(mips_cps_get_bootcfg) |
| |
| LEAF(mips_cps_boot_vpes) |
| lw ta2, COREBOOTCFG_VPEMASK(a0) |
| PTR_L ta3, COREBOOTCFG_VPECONFIG(a0) |
| |
| #if defined(CONFIG_CPU_MIPSR6) |
| |
| has_vp t0, 5f |
| |
| /* Find base address of CPC */ |
| PTR_LA t1, mips_gcr_base |
| PTR_L t1, 0(t1) |
| PTR_L t1, GCR_CPC_BASE_OFS(t1) |
| PTR_LI t2, ~0x7fff |
| and t1, t1, t2 |
| PTR_LI t2, UNCAC_BASE |
| PTR_ADD t1, t1, t2 |
| |
| /* Start any other VPs that ought to be running */ |
| PTR_S ta2, CPC_CL_VC_RUN_OFS(t1) |
| |
| /* Ensure this VP stops running if it shouldn't be */ |
| not ta2 |
| PTR_S ta2, CPC_CL_VC_STOP_OFS(t1) |
| ehb |
| |
| #elif defined(CONFIG_MIPS_MT) |
| |
| /* If the core doesn't support MT then return */ |
| has_mt t0, 5f |
| |
| /* Enter VPE configuration state */ |
| .set push |
| .set MIPS_ISA_LEVEL_RAW |
| .set mt |
| dvpe |
| .set pop |
| |
| PTR_LA t1, 1f |
| jr.hb t1 |
| nop |
| 1: mfc0 t1, CP0_MVPCONTROL |
| ori t1, t1, MVPCONTROL_VPC |
| mtc0 t1, CP0_MVPCONTROL |
| ehb |
| |
| /* Loop through each VPE */ |
| move t8, ta2 |
| li ta1, 0 |
| |
| /* Check whether the VPE should be running. If not, skip it */ |
| 1: andi t0, ta2, 1 |
| beqz t0, 2f |
| nop |
| |
| /* Operate on the appropriate TC */ |
| mfc0 t0, CP0_VPECONTROL |
| ori t0, t0, VPECONTROL_TARGTC |
| xori t0, t0, VPECONTROL_TARGTC |
| or t0, t0, ta1 |
| mtc0 t0, CP0_VPECONTROL |
| ehb |
| |
| .set push |
| .set MIPS_ISA_LEVEL_RAW |
| .set mt |
| |
| /* Skip the VPE if its TC is not halted */ |
| mftc0 t0, CP0_TCHALT |
| beqz t0, 2f |
| nop |
| |
| /* Calculate a pointer to the VPEs struct vpe_boot_config */ |
| li t0, VPEBOOTCFG_SIZE |
| mul t0, t0, ta1 |
| PTR_ADDU t0, t0, ta3 |
| |
| /* Set the TC restart PC */ |
| lw t1, VPEBOOTCFG_PC(t0) |
| mttc0 t1, CP0_TCRESTART |
| |
| /* Set the TC stack pointer */ |
| lw t1, VPEBOOTCFG_SP(t0) |
| mttgpr t1, sp |
| |
| /* Set the TC global pointer */ |
| lw t1, VPEBOOTCFG_GP(t0) |
| mttgpr t1, gp |
| |
| /* Copy config from this VPE */ |
| mfc0 t0, CP0_CONFIG |
| mttc0 t0, CP0_CONFIG |
| |
| /* |
| * Copy the EVA config from this VPE if the CPU supports it. |
| * CONFIG3 must exist to be running MT startup - just read it. |
| */ |
| mfc0 t0, CP0_CONFIG, 3 |
| and t0, t0, MIPS_CONF3_SC |
| beqz t0, 3f |
| nop |
| mfc0 t0, CP0_SEGCTL0 |
| mttc0 t0, CP0_SEGCTL0 |
| mfc0 t0, CP0_SEGCTL1 |
| mttc0 t0, CP0_SEGCTL1 |
| mfc0 t0, CP0_SEGCTL2 |
| mttc0 t0, CP0_SEGCTL2 |
| 3: |
| /* Ensure no software interrupts are pending */ |
| mttc0 zero, CP0_CAUSE |
| mttc0 zero, CP0_STATUS |
| |
| /* Set TC active, not interrupt exempt */ |
| mftc0 t0, CP0_TCSTATUS |
| li t1, ~TCSTATUS_IXMT |
| and t0, t0, t1 |
| ori t0, t0, TCSTATUS_A |
| mttc0 t0, CP0_TCSTATUS |
| |
| /* Clear the TC halt bit */ |
| mttc0 zero, CP0_TCHALT |
| |
| /* Set VPE active */ |
| mftc0 t0, CP0_VPECONF0 |
| ori t0, t0, VPECONF0_VPA |
| mttc0 t0, CP0_VPECONF0 |
| |
| /* Next VPE */ |
| 2: srl ta2, ta2, 1 |
| addiu ta1, ta1, 1 |
| bnez ta2, 1b |
| nop |
| |
| /* Leave VPE configuration state */ |
| mfc0 t1, CP0_MVPCONTROL |
| xori t1, t1, MVPCONTROL_VPC |
| mtc0 t1, CP0_MVPCONTROL |
| ehb |
| evpe |
| |
| .set pop |
| |
| /* Check whether this VPE is meant to be running */ |
| li t0, 1 |
| sll t0, t0, a1 |
| and t0, t0, t8 |
| bnez t0, 2f |
| nop |
| |
| /* This VPE should be offline, halt the TC */ |
| li t0, TCHALT_H |
| mtc0 t0, CP0_TCHALT |
| PTR_LA t0, 1f |
| 1: jr.hb t0 |
| nop |
| |
| 2: |
| |
| #endif /* CONFIG_MIPS_MT_SMP */ |
| |
| /* Return */ |
| 5: jr ra |
| nop |
| END(mips_cps_boot_vpes) |
| |
| #if MIPS_ISA_REV > 0 |
| LEAF(mips_cps_cache_init) |
| /* |
| * Clear the bits used to index the caches. Note that the architecture |
| * dictates that writing to any of TagLo or TagHi selects 0 or 2 should |
| * be valid for all MIPS32 CPUs, even those for which said writes are |
| * unnecessary. |
| */ |
| mtc0 zero, CP0_TAGLO, 0 |
| mtc0 zero, CP0_TAGHI, 0 |
| mtc0 zero, CP0_TAGLO, 2 |
| mtc0 zero, CP0_TAGHI, 2 |
| ehb |
| |
| /* Primary cache configuration is indicated by Config1 */ |
| mfc0 v0, CP0_CONFIG, 1 |
| |
| /* Detect I-cache line size */ |
| _EXT t0, v0, MIPS_CONF1_IL_SHF, MIPS_CONF1_IL_SZ |
| beqz t0, icache_done |
| li t1, 2 |
| sllv t0, t1, t0 |
| |
| /* Detect I-cache size */ |
| _EXT t1, v0, MIPS_CONF1_IS_SHF, MIPS_CONF1_IS_SZ |
| xori t2, t1, 0x7 |
| beqz t2, 1f |
| li t3, 32 |
| addiu t1, t1, 1 |
| sllv t1, t3, t1 |
| 1: /* At this point t1 == I-cache sets per way */ |
| _EXT t2, v0, MIPS_CONF1_IA_SHF, MIPS_CONF1_IA_SZ |
| addiu t2, t2, 1 |
| mul t1, t1, t0 |
| mul t1, t1, t2 |
| |
| li a0, CKSEG0 |
| PTR_ADD a1, a0, t1 |
| 1: cache Index_Store_Tag_I, 0(a0) |
| PTR_ADD a0, a0, t0 |
| bne a0, a1, 1b |
| nop |
| icache_done: |
| |
| /* Detect D-cache line size */ |
| _EXT t0, v0, MIPS_CONF1_DL_SHF, MIPS_CONF1_DL_SZ |
| beqz t0, dcache_done |
| li t1, 2 |
| sllv t0, t1, t0 |
| |
| /* Detect D-cache size */ |
| _EXT t1, v0, MIPS_CONF1_DS_SHF, MIPS_CONF1_DS_SZ |
| xori t2, t1, 0x7 |
| beqz t2, 1f |
| li t3, 32 |
| addiu t1, t1, 1 |
| sllv t1, t3, t1 |
| 1: /* At this point t1 == D-cache sets per way */ |
| _EXT t2, v0, MIPS_CONF1_DA_SHF, MIPS_CONF1_DA_SZ |
| addiu t2, t2, 1 |
| mul t1, t1, t0 |
| mul t1, t1, t2 |
| |
| li a0, CKSEG0 |
| PTR_ADDU a1, a0, t1 |
| PTR_SUBU a1, a1, t0 |
| 1: cache Index_Store_Tag_D, 0(a0) |
| bne a0, a1, 1b |
| PTR_ADD a0, a0, t0 |
| dcache_done: |
| |
| jr ra |
| nop |
| END(mips_cps_cache_init) |
| #endif /* MIPS_ISA_REV > 0 */ |
| |
| #if defined(CONFIG_MIPS_CPS_PM) && defined(CONFIG_CPU_PM) |
| |
| /* Calculate a pointer to this CPUs struct mips_static_suspend_state */ |
| .macro psstate dest |
| .set push |
| .set noat |
| lw $1, TI_CPU(gp) |
| sll $1, $1, LONGLOG |
| PTR_LA \dest, __per_cpu_offset |
| PTR_ADDU $1, $1, \dest |
| lw $1, 0($1) |
| PTR_LA \dest, cps_cpu_state |
| PTR_ADDU \dest, \dest, $1 |
| .set pop |
| .endm |
| |
| LEAF(mips_cps_pm_save) |
| /* Save CPU state */ |
| SUSPEND_SAVE_REGS |
| psstate t1 |
| SUSPEND_SAVE_STATIC |
| jr v0 |
| nop |
| END(mips_cps_pm_save) |
| |
| LEAF(mips_cps_pm_restore) |
| /* Restore CPU state */ |
| psstate t1 |
| RESUME_RESTORE_STATIC |
| RESUME_RESTORE_REGS_RETURN |
| END(mips_cps_pm_restore) |
| |
| #endif /* CONFIG_MIPS_CPS_PM && CONFIG_CPU_PM */ |
