summaryrefslogtreecommitdiffstats
path: root/arch/arm/mm/proc-v7.S
blob: 2c73a7301ff7017eea046df2f2b67e475ab653de (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
/*
 *  linux/arch/arm/mm/proc-v7.S
 *
 *  Copyright (C) 2001 Deep Blue Solutions Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  This is the "shell" of the ARMv7 processor support.
 */
#include <linux/init.h>
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/asm-offsets.h>
#include <asm/hwcap.h>
#include <asm/pgtable-hwdef.h>
#include <asm/pgtable.h>

#include "proc-macros.S"

#ifdef CONFIG_ARM_LPAE
#include "proc-v7-3level.S"
#else
#include "proc-v7-2level.S"
#endif

ENTRY(cpu_v7_proc_init)
	mov	pc, lr
ENDPROC(cpu_v7_proc_init)

ENTRY(cpu_v7_proc_fin)
	mrc	p15, 0, r0, c1, c0, 0		@ ctrl register
	bic	r0, r0, #0x1000			@ ...i............
	bic	r0, r0, #0x0006			@ .............ca.
	mcr	p15, 0, r0, c1, c0, 0		@ disable caches
	mov	pc, lr
ENDPROC(cpu_v7_proc_fin)

/*
 *	cpu_v7_reset(loc)
 *
 *	Perform a soft reset of the system.  Put the CPU into the
 *	same state as it would be if it had been reset, and branch
 *	to what would be the reset vector.
 *
 *	- loc   - location to jump to for soft reset
 *
 *	This code must be executed using a flat identity mapping with
 *      caches disabled.
 */
	.align	5
	.pushsection	.idmap.text, "ax"
ENTRY(cpu_v7_reset)
	mrc	p15, 0, r1, c1, c0, 0		@ ctrl register
	bic	r1, r1, #0x1			@ ...............m
 THUMB(	bic	r1, r1, #1 << 30 )		@ SCTLR.TE (Thumb exceptions)
	mcr	p15, 0, r1, c1, c0, 0		@ disable MMU
	isb
	bx	r0
ENDPROC(cpu_v7_reset)
	.popsection

/*
 *	cpu_v7_do_idle()
 *
 *	Idle the processor (eg, wait for interrupt).
 *
 *	IRQs are already disabled.
 */
ENTRY(cpu_v7_do_idle)
	dsb					@ WFI may enter a low-power mode
	wfi
	mov	pc, lr
ENDPROC(cpu_v7_do_idle)

ENTRY(cpu_v7_dcache_clean_area)
	ALT_SMP(mov	pc, lr)			@ MP extensions imply L1 PTW
	ALT_UP(W(nop))
	dcache_line_size r2, r3
1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
	add	r0, r0, r2
	subs	r1, r1, r2
	bhi	1b
	dsb
	mov	pc, lr
ENDPROC(cpu_v7_dcache_clean_area)

	string	cpu_v7_name, "ARMv7 Processor"
	.align

/* Suspend/resume support: derived from arch/arm/mach-s5pv210/sleep.S */
.globl	cpu_v7_suspend_size
.equ	cpu_v7_suspend_size, 4 * 8
#ifdef CONFIG_ARM_CPU_SUSPEND
ENTRY(cpu_v7_do_suspend)
	stmfd	sp!, {r4 - r10, lr}
	mrc	p15, 0, r4, c13, c0, 0	@ FCSE/PID
	mrc	p15, 0, r5, c13, c0, 3	@ User r/o thread ID
	stmia	r0!, {r4 - r5}
	mrc	p15, 0, r6, c3, c0, 0	@ Domain ID
	mrc	p15, 0, r7, c2, c0, 1	@ TTB 1
	mrc	p15, 0, r11, c2, c0, 2	@ TTB control register
	mrc	p15, 0, r8, c1, c0, 0	@ Control register
	mrc	p15, 0, r9, c1, c0, 1	@ Auxiliary control register
	mrc	p15, 0, r10, c1, c0, 2	@ Co-processor access control
	stmia	r0, {r6 - r11}
	ldmfd	sp!, {r4 - r10, pc}
ENDPROC(cpu_v7_do_suspend)

ENTRY(cpu_v7_do_resume)
	mov	ip, #0
	mcr	p15, 0, ip, c8, c7, 0	@ invalidate TLBs
	mcr	p15, 0, ip, c7, c5, 0	@ invalidate I cache
	mcr	p15, 0, ip, c13, c0, 1	@ set reserved context ID
	ldmia	r0!, {r4 - r5}
	mcr	p15, 0, r4, c13, c0, 0	@ FCSE/PID
	mcr	p15, 0, r5, c13, c0, 3	@ User r/o thread ID
	ldmia	r0, {r6 - r11}
	mcr	p15, 0, r6, c3, c0, 0	@ Domain ID
#ifndef CONFIG_ARM_LPAE
	ALT_SMP(orr	r1, r1, #TTB_FLAGS_SMP)
	ALT_UP(orr	r1, r1, #TTB_FLAGS_UP)
#endif
	mcr	p15, 0, r1, c2, c0, 0	@ TTB 0
	mcr	p15, 0, r7, c2, c0, 1	@ TTB 1
	mcr	p15, 0, r11, c2, c0, 2	@ TTB control register
	mrc	p15, 0, r4, c1, c0, 1	@ Read Auxiliary control register
	teq	r4, r9			@ Is it already set?
	mcrne	p15, 0, r9, c1, c0, 1	@ No, so write it
	mcr	p15, 0, r10, c1, c0, 2	@ Co-processor access control
	ldr	r4, =PRRR		@ PRRR
	ldr	r5, =NMRR		@ NMRR
	mcr	p15, 0, r4, c10, c2, 0	@ write PRRR
	mcr	p15, 0, r5, c10, c2, 1	@ write NMRR
	isb
	dsb
	mov	r0, r8			@ control register
	b	cpu_resume_mmu
ENDPROC(cpu_v7_do_resume)
#endif

	__CPUINIT

/*
 *	__v7_setup
 *
 *	Initialise TLB, Caches, and MMU state ready to switch the MMU
 *	on.  Return in r0 the new CP15 C1 control register setting.
 *
 *	This should be able to cover all ARMv7 cores.
 *
 *	It is assumed that:
 *	- cache type register is implemented
 */
__v7_ca5mp_setup:
__v7_ca9mp_setup:
	mov	r10, #(1 << 0)			@ TLB ops broadcasting
	b	1f
__v7_ca7mp_setup:
__v7_ca15mp_setup:
	mov	r10, #0
1:
#ifdef CONFIG_SMP
	ALT_SMP(mrc	p15, 0, r0, c1, c0, 1)
	ALT_UP(mov	r0, #(1 << 6))		@ fake it for UP
	tst	r0, #(1 << 6)			@ SMP/nAMP mode enabled?
	orreq	r0, r0, #(1 << 6)		@ Enable SMP/nAMP mode
	orreq	r0, r0, r10			@ Enable CPU-specific SMP bits
	mcreq	p15, 0, r0, c1, c0, 1
#endif
	b	__v7_setup

__v7_pj4b_setup:
#ifdef CONFIG_CPU_PJ4B

/* Auxiliary Debug Modes Control 1 Register */
#define PJ4B_STATIC_BP (1 << 2) /* Enable Static BP */
#define PJ4B_INTER_PARITY (1 << 8) /* Disable Internal Parity Handling */
#define PJ4B_BCK_OFF_STREX (1 << 5) /* Enable the back off of STREX instr */
#define PJ4B_CLEAN_LINE (1 << 16) /* Disable data transfer for clean line */

/* Auxiliary Debug Modes Control 2 Register */
#define PJ4B_FAST_LDR (1 << 23) /* Disable fast LDR */
#define PJ4B_SNOOP_DATA (1 << 25) /* Do not interleave write and snoop data */
#define PJ4B_CWF (1 << 27) /* Disable Critical Word First feature */
#define PJ4B_OUTSDNG_NC (1 << 29) /* Disable outstanding non cacheable rqst */
#define PJ4B_L1_REP_RR (1 << 30) /* L1 replacement - Strict round robin */
#define PJ4B_AUX_DBG_CTRL2 (PJ4B_SNOOP_DATA | PJ4B_CWF |\
			    PJ4B_OUTSDNG_NC | PJ4B_L1_REP_RR)

/* Auxiliary Functional Modes Control Register 0 */
#define PJ4B_SMP_CFB (1 << 1) /* Set SMP mode. Join the coherency fabric */
#define PJ4B_L1_PAR_CHK (1 << 2) /* Support L1 parity checking */
#define PJ4B_BROADCAST_CACHE (1 << 8) /* Broadcast Cache and TLB maintenance */

/* Auxiliary Debug Modes Control 0 Register */
#define PJ4B_WFI_WFE (1 << 22) /* WFI/WFE - serve the DVM and back to idle */

	/* Auxiliary Debug Modes Control 1 Register */
	mrc	p15, 1,	r0, c15, c1, 1
	orr     r0, r0, #PJ4B_CLEAN_LINE
	orr     r0, r0, #PJ4B_BCK_OFF_STREX
	orr     r0, r0, #PJ4B_INTER_PARITY
	bic	r0, r0, #PJ4B_STATIC_BP
	mcr	p15, 1,	r0, c15, c1, 1

	/* Auxiliary Debug Modes Control 2 Register */
	mrc	p15, 1,	r0, c15, c1, 2
	bic	r0, r0, #PJ4B_FAST_LDR
	orr	r0, r0, #PJ4B_AUX_DBG_CTRL2
	mcr	p15, 1,	r0, c15, c1, 2

	/* Auxiliary Functional Modes Control Register 0 */
	mrc	p15, 1,	r0, c15, c2, 0
#ifdef CONFIG_SMP
	orr	r0, r0, #PJ4B_SMP_CFB
#endif
	orr	r0, r0, #PJ4B_L1_PAR_CHK
	orr	r0, r0, #PJ4B_BROADCAST_CACHE
	mcr	p15, 1,	r0, c15, c2, 0

	/* Auxiliary Debug Modes Control 0 Register */
	mrc	p15, 1,	r0, c15, c1, 0
	orr	r0, r0, #PJ4B_WFI_WFE
	mcr	p15, 1,	r0, c15, c1, 0

#endif /* CONFIG_CPU_PJ4B */

__v7_setup:
	adr	r12, __v7_setup_stack		@ the local stack
	stmia	r12, {r0-r5, r7, r9, r11, lr}
	bl      v7_flush_dcache_louis
	ldmia	r12, {r0-r5, r7, r9, r11, lr}

	mrc	p15, 0, r0, c0, c0, 0		@ read main ID register
	and	r10, r0, #0xff000000		@ ARM?
	teq	r10, #0x41000000
	bne	3f
	and	r5, r0, #0x00f00000		@ variant
	and	r6, r0, #0x0000000f		@ revision
	orr	r6, r6, r5, lsr #20-4		@ combine variant and revision
	ubfx	r0, r0, #4, #12			@ primary part number

	/* Cortex-A8 Errata */
	ldr	r10, =0x00000c08		@ Cortex-A8 primary part number
	teq	r0, r10
	bne	2f
#if defined(CONFIG_ARM_ERRATA_430973) && !defined(CONFIG_ARCH_MULTIPLATFORM)

	teq	r5, #0x00100000			@ only present in r1p*
	mrceq	p15, 0, r10, c1, c0, 1		@ read aux control register
	orreq	r10, r10, #(1 << 6)		@ set IBE to 1
	mcreq	p15, 0, r10, c1, c0, 1		@ write aux control register
#endif
#ifdef CONFIG_ARM_ERRATA_458693
	teq	r6, #0x20			@ only present in r2p0
	mrceq	p15, 0, r10, c1, c0, 1		@ read aux control register
	orreq	r10, r10, #(1 << 5)		@ set L1NEON to 1
	orreq	r10, r10, #(1 << 9)		@ set PLDNOP to 1
	mcreq	p15, 0, r10, c1, c0, 1		@ write aux control register
#endif
#ifdef CONFIG_ARM_ERRATA_460075
	teq	r6, #0x20			@ only present in r2p0
	mrceq	p15, 1, r10, c9, c0, 2		@ read L2 cache aux ctrl register
	tsteq	r10, #1 << 22
	orreq	r10, r10, #(1 << 22)		@ set the Write Allocate disable bit
	mcreq	p15, 1, r10, c9, c0, 2		@ write the L2 cache aux ctrl register
#endif
	b	3f

	/* Cortex-A9 Errata */
2:	ldr	r10, =0x00000c09		@ Cortex-A9 primary part number
	teq	r0, r10
	bne	3f
#ifdef CONFIG_ARM_ERRATA_742230
	cmp	r6, #0x22			@ only present up to r2p2
	mrcle	p15, 0, r10, c15, c0, 1		@ read diagnostic register
	orrle	r10, r10, #1 << 4		@ set bit #4
	mcrle	p15, 0, r10, c15, c0, 1		@ write diagnostic register
#endif
#ifdef CONFIG_ARM_ERRATA_742231
	teq	r6, #0x20			@ present in r2p0
	teqne	r6, #0x21			@ present in r2p1
	teqne	r6, #0x22			@ present in r2p2
	mrceq	p15, 0, r10, c15, c0, 1		@ read diagnostic register
	orreq	r10, r10, #1 << 12		@ set bit #12
	orreq	r10, r10, #1 << 22		@ set bit #22
	mcreq	p15, 0, r10, c15, c0, 1		@ write diagnostic register
#endif
#ifdef CONFIG_ARM_ERRATA_743622
	teq	r5, #0x00200000			@ only present in r2p*
	mrceq	p15, 0, r10, c15, c0, 1		@ read diagnostic register
	orreq	r10, r10, #1 << 6		@ set bit #6
	mcreq	p15, 0, r10, c15, c0, 1		@ write diagnostic register
#endif
#if defined(CONFIG_ARM_ERRATA_751472) && defined(CONFIG_SMP)
	ALT_SMP(cmp r6, #0x30)			@ present prior to r3p0
	ALT_UP_B(1f)
	mrclt	p15, 0, r10, c15, c0, 1		@ read diagnostic register
	orrlt	r10, r10, #1 << 11		@ set bit #11
	mcrlt	p15, 0, r10, c15, c0, 1		@ write diagnostic register
1:
#endif

3:	mov	r10, #0
	mcr	p15, 0, r10, c7, c5, 0		@ I+BTB cache invalidate
	dsb
#ifdef CONFIG_MMU
	mcr	p15, 0, r10, c8, c7, 0		@ invalidate I + D TLBs
	v7_ttb_setup r10, r4, r8, r5		@ TTBCR, TTBRx setup
	ldr	r5, =PRRR			@ PRRR
	ldr	r6, =NMRR			@ NMRR
	mcr	p15, 0, r5, c10, c2, 0		@ write PRRR
	mcr	p15, 0, r6, c10, c2, 1		@ write NMRR
#endif
#ifndef CONFIG_ARM_THUMBEE
	mrc	p15, 0, r0, c0, c1, 0		@ read ID_PFR0 for ThumbEE
	and	r0, r0, #(0xf << 12)		@ ThumbEE enabled field
	teq	r0, #(1 << 12)			@ check if ThumbEE is present
	bne	1f
	mov	r5, #0
	mcr	p14, 6, r5, c1, c0, 0		@ Initialize TEEHBR to 0
	mrc	p14, 6, r0, c0, c0, 0		@ load TEECR
	orr	r0, r0, #1			@ set the 1st bit in order to
	mcr	p14, 6, r0, c0, c0, 0		@ stop userspace TEEHBR access
1:
#endif
	adr	r5, v7_crval
	ldmia	r5, {r5, r6}
#ifdef CONFIG_CPU_ENDIAN_BE8
	orr	r6, r6, #1 << 25		@ big-endian page tables
#endif
#ifdef CONFIG_SWP_EMULATE
	orr     r5, r5, #(1 << 10)              @ set SW bit in "clear"
	bic     r6, r6, #(1 << 10)              @ clear it in "mmuset"
#endif
   	mrc	p15, 0, r0, c1, c0, 0		@ read control register
	bic	r0, r0, r5			@ clear bits them
	orr	r0, r0, r6			@ set them
 THUMB(	orr	r0, r0, #1 << 30	)	@ Thumb exceptions
	mov	pc, lr				@ return to head.S:__ret
ENDPROC(__v7_setup)

	.align	2
__v7_setup_stack:
	.space	4 * 11				@ 11 registers

	__INITDATA

	@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
	define_processor_functions v7, dabort=v7_early_abort, pabort=v7_pabort, suspend=1

	.section ".rodata"

	string	cpu_arch_name, "armv7"
	string	cpu_elf_name, "v7"
	.align

	.section ".proc.info.init", #alloc, #execinstr

	/*
	 * Standard v7 proc info content
	 */
.macro __v7_proc initfunc, mm_mmuflags = 0, io_mmuflags = 0, hwcaps = 0
	ALT_SMP(.long	PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_AP_READ | \
			PMD_SECT_AF | PMD_FLAGS_SMP | \mm_mmuflags)
	ALT_UP(.long	PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_AP_READ | \
			PMD_SECT_AF | PMD_FLAGS_UP | \mm_mmuflags)
	.long	PMD_TYPE_SECT | PMD_SECT_AP_WRITE | \
		PMD_SECT_AP_READ | PMD_SECT_AF | \io_mmuflags
	W(b)	\initfunc
	.long	cpu_arch_name
	.long	cpu_elf_name
	.long	HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_FAST_MULT | \
		HWCAP_EDSP | HWCAP_TLS | \hwcaps
	.long	cpu_v7_name
	.long	v7_processor_functions
	.long	v7wbi_tlb_fns
	.long	v6_user_fns
	.long	v7_cache_fns
.endm

#ifndef CONFIG_ARM_LPAE
	/*
	 * ARM Ltd. Cortex A5 processor.
	 */
	.type   __v7_ca5mp_proc_info, #object
__v7_ca5mp_proc_info:
	.long	0x410fc050
	.long	0xff0ffff0
	__v7_proc __v7_ca5mp_setup
	.size	__v7_ca5mp_proc_info, . - __v7_ca5mp_proc_info

	/*
	 * ARM Ltd. Cortex A9 processor.
	 */
	.type   __v7_ca9mp_proc_info, #object
__v7_ca9mp_proc_info:
	.long	0x410fc090
	.long	0xff0ffff0
	__v7_proc __v7_ca9mp_setup
	.size	__v7_ca9mp_proc_info, . - __v7_ca9mp_proc_info

#endif	/* CONFIG_ARM_LPAE */

	/*
	 * Marvell PJ4B processor.
	 */
	.type   __v7_pj4b_proc_info, #object
__v7_pj4b_proc_info:
	.long	0x562f5840
	.long	0xfffffff0
	__v7_proc __v7_pj4b_setup
	.size	__v7_pj4b_proc_info, . - __v7_pj4b_proc_info

	/*
	 * ARM Ltd. Cortex A7 processor.
	 */
	.type	__v7_ca7mp_proc_info, #object
__v7_ca7mp_proc_info:
	.long	0x410fc070
	.long	0xff0ffff0
	__v7_proc __v7_ca7mp_setup
	.size	__v7_ca7mp_proc_info, . - __v7_ca7mp_proc_info

	/*
	 * ARM Ltd. Cortex A15 processor.
	 */
	.type	__v7_ca15mp_proc_info, #object
__v7_ca15mp_proc_info:
	.long	0x410fc0f0
	.long	0xff0ffff0
	__v7_proc __v7_ca15mp_setup
	.size	__v7_ca15mp_proc_info, . - __v7_ca15mp_proc_info

	/*
	 * Qualcomm Inc. Krait processors.
	 */
	.type	__krait_proc_info, #object
__krait_proc_info:
	.long	0x510f0400		@ Required ID value
	.long	0xff0ffc00		@ Mask for ID
	/*
	 * Some Krait processors don't indicate support for SDIV and UDIV
	 * instructions in the ARM instruction set, even though they actually
	 * do support them.
	 */
	__v7_proc __v7_setup, hwcaps = HWCAP_IDIV
	.size	__krait_proc_info, . - __krait_proc_info

	/*
	 * Match any ARMv7 processor core.
	 */
	.type	__v7_proc_info, #object
__v7_proc_info:
	.long	0x000f0000		@ Required ID value
	.long	0x000f0000		@ Mask for ID
	__v7_proc __v7_setup
	.size	__v7_proc_info, . - __v7_proc_info
OpenPOWER on IntegriCloud