2 * Copyright (C) 2013 Imagination Technologies
3 * Author: Paul Burton <paul.burton@imgtec.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
11 #include <asm/addrspace.h>
13 #include <asm/asm-offsets.h>
14 #include <asm/asmmacro.h>
15 #include <asm/cacheops.h>
17 #include <asm/mipsregs.h>
18 #include <asm/mipsmtregs.h>
21 #define GCR_CL_COHERENCE_OFS 0x2008
22 #define GCR_CL_ID_OFS 0x2028
29 # define STATUS_BITDEPS ST0_KX
31 # define STATUS_BITDEPS 0
34 #ifdef CONFIG_MIPS_CPS_NS16550
36 #define DUMP_EXCEP(name) \
38 jal mips_cps_bev_dump; \
42 #else /* !CONFIG_MIPS_CPS_NS16550 */
44 #define DUMP_EXCEP(name)
46 #endif /* !CONFIG_MIPS_CPS_NS16550 */
49 * Set dest to non-zero if the core supports the MT ASE, else zero. If
50 * MT is not supported then branch to nomt.
52 .macro has_mt dest, nomt
53 mfc0 \dest, CP0_CONFIG, 1
55 mfc0 \dest, CP0_CONFIG, 2
57 mfc0 \dest, CP0_CONFIG, 3
58 andi \dest, \dest, MIPS_CONF3_MT
63 .section .text.cps-vec
66 LEAF(mips_cps_core_entry)
68 * These first 4 bytes will be patched by cps_smp_setup to load the
69 * CCA to use into register s0.
73 /* Check whether we're here due to an NMI */
80 PTR_LA k0, nmi_handler
90 li t0, ST0_CU1 | ST0_CU0 | ST0_BEV | STATUS_BITDEPS
94 * Clear the bits used to index the caches. Note that the architecture
95 * dictates that writing to any of TagLo or TagHi selects 0 or 2 should
96 * be valid for all MIPS32 CPUs, even those for which said writes are
99 mtc0 zero, CP0_TAGLO, 0
100 mtc0 zero, CP0_TAGHI, 0
101 mtc0 zero, CP0_TAGLO, 2
102 mtc0 zero, CP0_TAGHI, 2
105 /* Primary cache configuration is indicated by Config1 */
106 mfc0 v0, CP0_CONFIG, 1
108 /* Detect I-cache line size */
109 _EXT t0, v0, MIPS_CONF1_IL_SHF, MIPS_CONF1_IL_SZ
114 /* Detect I-cache size */
115 _EXT t1, v0, MIPS_CONF1_IS_SHF, MIPS_CONF1_IS_SZ
121 1: /* At this point t1 == I-cache sets per way */
122 _EXT t2, v0, MIPS_CONF1_IA_SHF, MIPS_CONF1_IA_SZ
129 1: cache Index_Store_Tag_I, 0(a0)
135 /* Detect D-cache line size */
136 _EXT t0, v0, MIPS_CONF1_DL_SHF, MIPS_CONF1_DL_SZ
141 /* Detect D-cache size */
142 _EXT t1, v0, MIPS_CONF1_DS_SHF, MIPS_CONF1_DS_SZ
148 1: /* At this point t1 == D-cache sets per way */
149 _EXT t2, v0, MIPS_CONF1_DA_SHF, MIPS_CONF1_DA_SZ
157 1: cache Index_Store_Tag_D, 0(a0)
162 /* Set Kseg0 CCA to that in s0 */
170 /* Calculate an uncached address for the CM GCRs */
171 MFC0 v1, CP0_CMGCRBASE
173 PTR_LI t0, UNCAC_BASE
176 /* Enter the coherent domain */
178 sw t0, GCR_CL_COHERENCE_OFS(v1)
187 * We're up, cached & coherent. Perform any further required core-level
190 1: jal mips_cps_core_init
193 /* Do any EVA initialization if necessary */
197 * Boot any other VPEs within this core that should be online, and
198 * deactivate this VPE if it should be offline.
200 jal mips_cps_boot_vpes
204 PTR_L t1, VPEBOOTCFG_PC(v0)
205 PTR_L gp, VPEBOOTCFG_GP(v0)
206 PTR_L sp, VPEBOOTCFG_SP(v0)
209 END(mips_cps_core_entry)
213 DUMP_EXCEP("TLB Fill")
220 DUMP_EXCEP("XTLB Fill")
234 DUMP_EXCEP("General")
241 DUMP_EXCEP("Interrupt")
249 PTR_LA k0, ejtag_debug_handler
254 LEAF(mips_cps_core_init)
255 #ifdef CONFIG_MIPS_MT_SMP
256 /* Check that the core implements the MT ASE */
262 /* Only allow 1 TC per VPE to execute... */
265 /* ...and for the moment only 1 VPE */
271 /* Enter VPE configuration state */
272 1: mfc0 t0, CP0_MVPCONTROL
273 ori t0, t0, MVPCONTROL_VPC
274 mtc0 t0, CP0_MVPCONTROL
276 /* Retrieve the number of VPEs within the core */
277 mfc0 t0, CP0_MVPCONF0
278 srl t0, t0, MVPCONF0_PVPE_SHIFT
279 andi t0, t0, (MVPCONF0_PVPE >> MVPCONF0_PVPE_SHIFT)
282 /* If there's only 1, we're done */
286 /* Loop through each VPE within this core */
289 1: /* Operate on the appropriate TC */
290 mtc0 ta1, CP0_VPECONTROL
293 /* Bind TC to VPE (1:1 TC:VPE mapping) */
294 mttc0 ta1, CP0_TCBIND
296 /* Set exclusive TC, non-active, master */
298 sll t1, ta1, VPECONF0_XTC_SHIFT
300 mttc0 t0, CP0_VPECONF0
302 /* Set TC non-active, non-allocatable */
303 mttc0 zero, CP0_TCSTATUS
315 /* Leave VPE configuration state */
316 2: mfc0 t0, CP0_MVPCONTROL
317 xori t0, t0, MVPCONTROL_VPC
318 mtc0 t0, CP0_MVPCONTROL
324 END(mips_cps_core_init)
326 LEAF(mips_cps_boot_vpes)
327 /* Retrieve CM base address */
328 PTR_LA t0, mips_cm_base
331 /* Calculate a pointer to this cores struct core_boot_config */
332 lw t0, GCR_CL_ID_OFS(t0)
333 li t1, COREBOOTCFG_SIZE
335 PTR_LA t1, mips_cps_core_bootcfg
339 /* Calculate this VPEs ID. If the core doesn't support MT use 0 */
341 #ifdef CONFIG_MIPS_MT_SMP
344 /* Find the number of VPEs present in the core */
345 mfc0 t1, CP0_MVPCONF0
346 srl t1, t1, MVPCONF0_PVPE_SHIFT
347 andi t1, t1, MVPCONF0_PVPE >> MVPCONF0_PVPE_SHIFT
350 /* Calculate a mask for the VPE ID from EBase.CPUNum */
358 /* Retrieve the VPE ID from EBase.CPUNum */
363 1: /* Calculate a pointer to this VPEs struct vpe_boot_config */
364 li t1, VPEBOOTCFG_SIZE
366 PTR_L ta3, COREBOOTCFG_VPECONFIG(t0)
369 #ifdef CONFIG_MIPS_MT_SMP
371 /* If the core doesn't support MT then return */
380 1: /* Enter VPE configuration state */
385 1: mfc0 t1, CP0_MVPCONTROL
386 ori t1, t1, MVPCONTROL_VPC
387 mtc0 t1, CP0_MVPCONTROL
390 /* Loop through each VPE */
391 PTR_L ta2, COREBOOTCFG_VPEMASK(t0)
395 /* Check whether the VPE should be running. If not, skip it */
400 /* Operate on the appropriate TC */
401 mfc0 t0, CP0_VPECONTROL
402 ori t0, t0, VPECONTROL_TARGTC
403 xori t0, t0, VPECONTROL_TARGTC
405 mtc0 t0, CP0_VPECONTROL
408 /* Skip the VPE if its TC is not halted */
413 /* Calculate a pointer to the VPEs struct vpe_boot_config */
414 li t0, VPEBOOTCFG_SIZE
418 /* Set the TC restart PC */
419 lw t1, VPEBOOTCFG_PC(t0)
420 mttc0 t1, CP0_TCRESTART
422 /* Set the TC stack pointer */
423 lw t1, VPEBOOTCFG_SP(t0)
426 /* Set the TC global pointer */
427 lw t1, VPEBOOTCFG_GP(t0)
430 /* Copy config from this VPE */
434 /* Ensure no software interrupts are pending */
435 mttc0 zero, CP0_CAUSE
436 mttc0 zero, CP0_STATUS
438 /* Set TC active, not interrupt exempt */
439 mftc0 t0, CP0_TCSTATUS
440 li t1, ~TCSTATUS_IXMT
442 ori t0, t0, TCSTATUS_A
443 mttc0 t0, CP0_TCSTATUS
445 /* Clear the TC halt bit */
446 mttc0 zero, CP0_TCHALT
449 mftc0 t0, CP0_VPECONF0
450 ori t0, t0, VPECONF0_VPA
451 mttc0 t0, CP0_VPECONF0
459 /* Leave VPE configuration state */
460 mfc0 t1, CP0_MVPCONTROL
461 xori t1, t1, MVPCONTROL_VPC
462 mtc0 t1, CP0_MVPCONTROL
466 /* Check whether this VPE is meant to be running */
473 /* This VPE should be offline, halt the TC */
482 #endif /* CONFIG_MIPS_MT_SMP */
487 END(mips_cps_boot_vpes)
489 #if defined(CONFIG_MIPS_CPS_PM) && defined(CONFIG_CPU_PM)
491 /* Calculate a pointer to this CPUs struct mips_static_suspend_state */
497 PTR_LA \dest, __per_cpu_offset
500 PTR_LA \dest, cps_cpu_state
501 addu \dest, \dest, $1
505 LEAF(mips_cps_pm_save)
512 END(mips_cps_pm_save)
514 LEAF(mips_cps_pm_restore)
515 /* Restore CPU state */
517 RESUME_RESTORE_STATIC
518 RESUME_RESTORE_REGS_RETURN
519 END(mips_cps_pm_restore)
521 #endif /* CONFIG_MIPS_CPS_PM && CONFIG_CPU_PM */