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 /* Calculate an uncached address for the CM GCRs */
67 MFC0 $1, CP0_CMGCRBASE
69 PTR_LI \dest, UNCAC_BASE
70 PTR_ADDU \dest, \dest, $1
74 .section .text.cps-vec
77 LEAF(mips_cps_core_entry)
79 * These first 4 bytes will be patched by cps_smp_setup to load the
80 * CCA to use into register s0.
84 /* Check whether we're here due to an NMI */
91 PTR_LA k0, nmi_handler
101 li t0, ST0_CU1 | ST0_CU0 | ST0_BEV | STATUS_BITDEPS
104 /* Skip cache & coherence setup if we're already coherent */
106 lw s7, GCR_CL_COHERENCE_OFS(v1)
110 /* Initialize the L1 caches */
111 jal mips_cps_cache_init
114 /* Enter the coherent domain */
116 sw t0, GCR_CL_COHERENCE_OFS(v1)
119 /* Set Kseg0 CCA to that in s0 */
120 1: mfc0 t0, CP0_CONFIG
133 * We're up, cached & coherent. Perform any EVA initialization necessary
134 * before we access memory.
138 /* Retrieve boot configuration pointers */
139 jal mips_cps_get_bootcfg
142 /* Skip core-level init if we started up coherent */
146 /* Perform any further required core-level initialisation */
147 jal mips_cps_core_init
151 * Boot any other VPEs within this core that should be online, and
152 * deactivate this VPE if it should be offline.
155 jal mips_cps_boot_vpes
159 1: PTR_L t1, VPEBOOTCFG_PC(v1)
160 PTR_L gp, VPEBOOTCFG_GP(v1)
161 PTR_L sp, VPEBOOTCFG_SP(v1)
164 END(mips_cps_core_entry)
168 DUMP_EXCEP("TLB Fill")
175 DUMP_EXCEP("XTLB Fill")
189 DUMP_EXCEP("General")
196 DUMP_EXCEP("Interrupt")
204 PTR_LA k0, ejtag_debug_handler
209 LEAF(mips_cps_core_init)
210 #ifdef CONFIG_MIPS_MT_SMP
211 /* Check that the core implements the MT ASE */
217 /* Only allow 1 TC per VPE to execute... */
220 /* ...and for the moment only 1 VPE */
226 /* Enter VPE configuration state */
227 1: mfc0 t0, CP0_MVPCONTROL
228 ori t0, t0, MVPCONTROL_VPC
229 mtc0 t0, CP0_MVPCONTROL
231 /* Retrieve the number of VPEs within the core */
232 mfc0 t0, CP0_MVPCONF0
233 srl t0, t0, MVPCONF0_PVPE_SHIFT
234 andi t0, t0, (MVPCONF0_PVPE >> MVPCONF0_PVPE_SHIFT)
237 /* If there's only 1, we're done */
241 /* Loop through each VPE within this core */
244 1: /* Operate on the appropriate TC */
245 mtc0 ta1, CP0_VPECONTROL
248 /* Bind TC to VPE (1:1 TC:VPE mapping) */
249 mttc0 ta1, CP0_TCBIND
251 /* Set exclusive TC, non-active, master */
253 sll t1, ta1, VPECONF0_XTC_SHIFT
255 mttc0 t0, CP0_VPECONF0
257 /* Set TC non-active, non-allocatable */
258 mttc0 zero, CP0_TCSTATUS
270 /* Leave VPE configuration state */
271 2: mfc0 t0, CP0_MVPCONTROL
272 xori t0, t0, MVPCONTROL_VPC
273 mtc0 t0, CP0_MVPCONTROL
279 END(mips_cps_core_init)
282 * mips_cps_get_bootcfg() - retrieve boot configuration pointers
284 * Returns: pointer to struct core_boot_config in v0, pointer to
285 * struct vpe_boot_config in v1, VPE ID in t9
287 LEAF(mips_cps_get_bootcfg)
288 /* Calculate a pointer to this cores struct core_boot_config */
290 lw t0, GCR_CL_ID_OFS(t0)
291 li t1, COREBOOTCFG_SIZE
293 PTR_LA t1, mips_cps_core_bootcfg
297 /* Calculate this VPEs ID. If the core doesn't support MT use 0 */
299 #ifdef CONFIG_MIPS_MT_SMP
302 /* Find the number of VPEs present in the core */
303 mfc0 t1, CP0_MVPCONF0
304 srl t1, t1, MVPCONF0_PVPE_SHIFT
305 andi t1, t1, MVPCONF0_PVPE >> MVPCONF0_PVPE_SHIFT
308 /* Calculate a mask for the VPE ID from EBase.CPUNum */
316 /* Retrieve the VPE ID from EBase.CPUNum */
321 1: /* Calculate a pointer to this VPEs struct vpe_boot_config */
322 li t1, VPEBOOTCFG_SIZE
324 PTR_L ta3, COREBOOTCFG_VPECONFIG(v0)
329 END(mips_cps_get_bootcfg)
331 LEAF(mips_cps_boot_vpes)
332 PTR_L ta2, COREBOOTCFG_VPEMASK(a0)
333 PTR_L ta3, COREBOOTCFG_VPECONFIG(a0)
335 #ifdef CONFIG_MIPS_MT
340 /* If the core doesn't support MT then return */
343 /* Enter VPE configuration state */
348 1: mfc0 t1, CP0_MVPCONTROL
349 ori t1, t1, MVPCONTROL_VPC
350 mtc0 t1, CP0_MVPCONTROL
353 /* Loop through each VPE */
357 /* Check whether the VPE should be running. If not, skip it */
362 /* Operate on the appropriate TC */
363 mfc0 t0, CP0_VPECONTROL
364 ori t0, t0, VPECONTROL_TARGTC
365 xori t0, t0, VPECONTROL_TARGTC
367 mtc0 t0, CP0_VPECONTROL
370 /* Skip the VPE if its TC is not halted */
375 /* Calculate a pointer to the VPEs struct vpe_boot_config */
376 li t0, VPEBOOTCFG_SIZE
380 /* Set the TC restart PC */
381 lw t1, VPEBOOTCFG_PC(t0)
382 mttc0 t1, CP0_TCRESTART
384 /* Set the TC stack pointer */
385 lw t1, VPEBOOTCFG_SP(t0)
388 /* Set the TC global pointer */
389 lw t1, VPEBOOTCFG_GP(t0)
392 /* Copy config from this VPE */
396 /* Ensure no software interrupts are pending */
397 mttc0 zero, CP0_CAUSE
398 mttc0 zero, CP0_STATUS
400 /* Set TC active, not interrupt exempt */
401 mftc0 t0, CP0_TCSTATUS
402 li t1, ~TCSTATUS_IXMT
404 ori t0, t0, TCSTATUS_A
405 mttc0 t0, CP0_TCSTATUS
407 /* Clear the TC halt bit */
408 mttc0 zero, CP0_TCHALT
411 mftc0 t0, CP0_VPECONF0
412 ori t0, t0, VPECONF0_VPA
413 mttc0 t0, CP0_VPECONF0
421 /* Leave VPE configuration state */
422 mfc0 t1, CP0_MVPCONTROL
423 xori t1, t1, MVPCONTROL_VPC
424 mtc0 t1, CP0_MVPCONTROL
428 /* Check whether this VPE is meant to be running */
435 /* This VPE should be offline, halt the TC */
444 #endif /* CONFIG_MIPS_MT_SMP */
449 END(mips_cps_boot_vpes)
451 LEAF(mips_cps_cache_init)
453 * Clear the bits used to index the caches. Note that the architecture
454 * dictates that writing to any of TagLo or TagHi selects 0 or 2 should
455 * be valid for all MIPS32 CPUs, even those for which said writes are
458 mtc0 zero, CP0_TAGLO, 0
459 mtc0 zero, CP0_TAGHI, 0
460 mtc0 zero, CP0_TAGLO, 2
461 mtc0 zero, CP0_TAGHI, 2
464 /* Primary cache configuration is indicated by Config1 */
465 mfc0 v0, CP0_CONFIG, 1
467 /* Detect I-cache line size */
468 _EXT t0, v0, MIPS_CONF1_IL_SHF, MIPS_CONF1_IL_SZ
473 /* Detect I-cache size */
474 _EXT t1, v0, MIPS_CONF1_IS_SHF, MIPS_CONF1_IS_SZ
480 1: /* At this point t1 == I-cache sets per way */
481 _EXT t2, v0, MIPS_CONF1_IA_SHF, MIPS_CONF1_IA_SZ
488 1: cache Index_Store_Tag_I, 0(a0)
494 /* Detect D-cache line size */
495 _EXT t0, v0, MIPS_CONF1_DL_SHF, MIPS_CONF1_DL_SZ
500 /* Detect D-cache size */
501 _EXT t1, v0, MIPS_CONF1_DS_SHF, MIPS_CONF1_DS_SZ
507 1: /* At this point t1 == D-cache sets per way */
508 _EXT t2, v0, MIPS_CONF1_DA_SHF, MIPS_CONF1_DA_SZ
516 1: cache Index_Store_Tag_D, 0(a0)
523 END(mips_cps_cache_init)
525 #if defined(CONFIG_MIPS_CPS_PM) && defined(CONFIG_CPU_PM)
527 /* Calculate a pointer to this CPUs struct mips_static_suspend_state */
533 PTR_LA \dest, __per_cpu_offset
536 PTR_LA \dest, cps_cpu_state
537 addu \dest, \dest, $1
541 LEAF(mips_cps_pm_save)
548 END(mips_cps_pm_save)
550 LEAF(mips_cps_pm_restore)
551 /* Restore CPU state */
553 RESUME_RESTORE_STATIC
554 RESUME_RESTORE_REGS_RETURN
555 END(mips_cps_pm_restore)
557 #endif /* CONFIG_MIPS_CPS_PM && CONFIG_CPU_PM */