xref: /linux/arch/arm/mm/proc-xsc3.S (revision 4853f1f6ace32c68a04287353e428c4cfc3fa8ed) 
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * linux/arch/arm/mm/proc-xsc3.S
4 *
5 * Original Author: Matthew Gilbert
6 * Current Maintainer: Lennert Buytenhek <buytenh@wantstofly.org>
7 *
8 * Copyright 2004 (C) Intel Corp.
9 * Copyright 2005 (C) MontaVista Software, Inc.
10 *
11 * MMU functions for the Intel XScale3 Core (XSC3).  The XSC3 core is
12 * an extension to Intel's original XScale core that adds the following
13 * features:
14 *
15 * - ARMv6 Supersections
16 * - Low Locality Reference pages (replaces mini-cache)
17 * - 36-bit addressing
18 * - L2 cache
19 * - Cache coherency if chipset supports it
20 *
21 * Based on original XScale code by Nicolas Pitre.
22 */
23
24#include <linux/linkage.h>
25#include <linux/init.h>
26#include <linux/cfi_types.h>
27#include <linux/pgtable.h>
28#include <asm/assembler.h>
29#include <asm/hwcap.h>
30#include <asm/pgtable-hwdef.h>
31#include <asm/page.h>
32#include <asm/ptrace.h>
33#include "proc-macros.S"
34
35/*
36 * This is the maximum size of an area which will be flushed.  If the
37 * area is larger than this, then we flush the whole cache.
38 */
39#define MAX_AREA_SIZE	32768
40
41/*
42 * The cache line size of the L1 I, L1 D and unified L2 cache.
43 */
44#define CACHELINESIZE	32
45
46/*
47 * The size of the L1 D cache.
48 */
49#define CACHESIZE	32768
50
51/*
52 * This macro is used to wait for a CP15 write and is needed when we
53 * have to ensure that the last operation to the coprocessor was
54 * completed before continuing with operation.
55 */
56	.macro	cpwait_ret, lr, rd
57	mrc	p15, 0, \rd, c2, c0, 0		@ arbitrary read of cp15
58	sub	pc, \lr, \rd, LSR #32		@ wait for completion and
59						@ flush instruction pipeline
60	.endm
61
62/*
63 * This macro cleans and invalidates the entire L1 D cache.
64 */
65
66 	.macro  clean_d_cache rd, rs
67	mov	\rd, #0x1f00
68	orr	\rd, \rd, #0x00e0
691:	mcr	p15, 0, \rd, c7, c14, 2		@ clean/invalidate L1 D line
70	adds	\rd, \rd, #0x40000000
71	bcc	1b
72	subs	\rd, \rd, #0x20
73	bpl	1b
74	.endm
75
76	.text
77
78/*
79 * cpu_xsc3_proc_init()
80 *
81 * Nothing too exciting at the moment
82 */
83SYM_TYPED_FUNC_START(cpu_xsc3_proc_init)
84	ret	lr
85SYM_FUNC_END(cpu_xsc3_proc_init)
86
87/*
88 * cpu_xsc3_proc_fin()
89 */
90SYM_TYPED_FUNC_START(cpu_xsc3_proc_fin)
91	mrc	p15, 0, r0, c1, c0, 0		@ ctrl register
92	bic	r0, r0, #0x1800			@ ...IZ...........
93	bic	r0, r0, #0x0006			@ .............CA.
94	mcr	p15, 0, r0, c1, c0, 0		@ disable caches
95	ret	lr
96SYM_FUNC_END(cpu_xsc3_proc_fin)
97
98/*
99 * cpu_xsc3_reset(loc)
100 *
101 * Perform a soft reset of the system.  Put the CPU into the
102 * same state as it would be if it had been reset, and branch
103 * to what would be the reset vector.
104 *
105 * loc: location to jump to for soft reset
106 */
107	.align	5
108	.pushsection	.idmap.text, "ax"
109SYM_TYPED_FUNC_START(cpu_xsc3_reset)
110	mov	r1, #PSR_F_BIT|PSR_I_BIT|SVC_MODE
111	msr	cpsr_c, r1			@ reset CPSR
112	mrc	p15, 0, r1, c1, c0, 0		@ ctrl register
113	bic	r1, r1, #0x3900			@ ..VIZ..S........
114	bic	r1, r1, #0x0086			@ ........B....CA.
115	mcr	p15, 0, r1, c1, c0, 0		@ ctrl register
116	mcr	p15, 0, ip, c7, c7, 0		@ invalidate L1 caches and BTB
117	bic	r1, r1, #0x0001			@ ...............M
118	mcr	p15, 0, r1, c1, c0, 0		@ ctrl register
119	@ CAUTION: MMU turned off from this point.  We count on the pipeline
120	@ already containing those two last instructions to survive.
121	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I and D TLBs
122	ret	r0
123SYM_FUNC_END(cpu_xsc3_reset)
124	.popsection
125
126/*
127 * cpu_xsc3_do_idle()
128 *
129 * Cause the processor to idle
130 *
131 * For now we do nothing but go to idle mode for every case
132 *
133 * XScale supports clock switching, but using idle mode support
134 * allows external hardware to react to system state changes.
135 */
136	.align	5
137
138SYM_TYPED_FUNC_START(cpu_xsc3_do_idle)
139	mov	r0, #1
140	mcr	p14, 0, r0, c7, c0, 0		@ go to idle
141	ret	lr
142SYM_FUNC_END(cpu_xsc3_do_idle)
143
144/* ================================= CACHE ================================ */
145
146/*
147 *	flush_icache_all()
148 *
149 *	Unconditionally clean and invalidate the entire icache.
150 */
151SYM_TYPED_FUNC_START(xsc3_flush_icache_all)
152	mov	r0, #0
153	mcr	p15, 0, r0, c7, c5, 0		@ invalidate I cache
154	ret	lr
155SYM_FUNC_END(xsc3_flush_icache_all)
156
157/*
158 *	flush_user_cache_all()
159 *
160 *	Invalidate all cache entries in a particular address
161 *	space.
162 */
163SYM_FUNC_ALIAS(xsc3_flush_user_cache_all, xsc3_flush_kern_cache_all)
164
165/*
166 *	flush_kern_cache_all()
167 *
168 *	Clean and invalidate the entire cache.
169 */
170SYM_TYPED_FUNC_START(xsc3_flush_kern_cache_all)
171	mov	r2, #VM_EXEC
172	mov	ip, #0
173__flush_whole_cache:
174	clean_d_cache r0, r1
175	tst	r2, #VM_EXEC
176	mcrne	p15, 0, ip, c7, c5, 0		@ invalidate L1 I cache and BTB
177	mcrne	p15, 0, ip, c7, c10, 4		@ data write barrier
178	mcrne	p15, 0, ip, c7, c5, 4		@ prefetch flush
179	ret	lr
180SYM_FUNC_END(xsc3_flush_kern_cache_all)
181
182/*
183 *	flush_user_cache_range(start, end, vm_flags)
184 *
185 *	Invalidate a range of cache entries in the specified
186 *	address space.
187 *
188 *	- start - start address (may not be aligned)
189 *	- end	- end address (exclusive, may not be aligned)
190 *	- vma	- vma_area_struct describing address space
191 */
192	.align	5
193SYM_TYPED_FUNC_START(xsc3_flush_user_cache_range)
194	mov	ip, #0
195	sub	r3, r1, r0			@ calculate total size
196	cmp	r3, #MAX_AREA_SIZE
197	bhs	__flush_whole_cache
198
1991:	tst	r2, #VM_EXEC
200	mcrne	p15, 0, r0, c7, c5, 1		@ invalidate L1 I line
201	mcr	p15, 0, r0, c7, c14, 1		@ clean/invalidate L1 D line
202	add	r0, r0, #CACHELINESIZE
203	cmp	r0, r1
204	blo	1b
205	tst	r2, #VM_EXEC
206	mcrne	p15, 0, ip, c7, c5, 6		@ invalidate BTB
207	mcrne	p15, 0, ip, c7, c10, 4		@ data write barrier
208	mcrne	p15, 0, ip, c7, c5, 4		@ prefetch flush
209	ret	lr
210SYM_FUNC_END(xsc3_flush_user_cache_range)
211
212/*
213 *	coherent_kern_range(start, end)
214 *
215 *	Ensure coherency between the I cache and the D cache in the
216 *	region described by start.  If you have non-snooping
217 *	Harvard caches, you need to implement this function.
218 *
219 *	- start  - virtual start address
220 *	- end	 - virtual end address
221 *
222 *	Note: single I-cache line invalidation isn't used here since
223 *	it also trashes the mini I-cache used by JTAG debuggers.
224 */
225SYM_TYPED_FUNC_START(xsc3_coherent_kern_range)
226#ifdef CONFIG_CFI_CLANG /* Fallthrough if !CFI */
227	b	xsc3_coherent_user_range
228#endif
229SYM_FUNC_END(xsc3_coherent_kern_range)
230
231SYM_TYPED_FUNC_START(xsc3_coherent_user_range)
232	bic	r0, r0, #CACHELINESIZE - 1
2331:	mcr	p15, 0, r0, c7, c10, 1		@ clean L1 D line
234	add	r0, r0, #CACHELINESIZE
235	cmp	r0, r1
236	blo	1b
237	mov	r0, #0
238	mcr	p15, 0, r0, c7, c5, 0		@ invalidate L1 I cache and BTB
239	mcr	p15, 0, r0, c7, c10, 4		@ data write barrier
240	mcr	p15, 0, r0, c7, c5, 4		@ prefetch flush
241	ret	lr
242SYM_FUNC_END(xsc3_coherent_user_range)
243
244/*
245 *	flush_kern_dcache_area(void *addr, size_t size)
246 *
247 *	Ensure no D cache aliasing occurs, either with itself or
248 *	the I cache.
249 *
250 *	- addr	- kernel address
251 *	- size	- region size
252 */
253SYM_TYPED_FUNC_START(xsc3_flush_kern_dcache_area)
254	add	r1, r0, r1
2551:	mcr	p15, 0, r0, c7, c14, 1		@ clean/invalidate L1 D line
256	add	r0, r0, #CACHELINESIZE
257	cmp	r0, r1
258	blo	1b
259	mov	r0, #0
260	mcr	p15, 0, r0, c7, c5, 0		@ invalidate L1 I cache and BTB
261	mcr	p15, 0, r0, c7, c10, 4		@ data write barrier
262	mcr	p15, 0, r0, c7, c5, 4		@ prefetch flush
263	ret	lr
264SYM_FUNC_END(xsc3_flush_kern_dcache_area)
265
266/*
267 *	dma_inv_range(start, end)
268 *
269 *	Invalidate (discard) the specified virtual address range.
270 *	May not write back any entries.  If 'start' or 'end'
271 *	are not cache line aligned, those lines must be written
272 *	back.
273 *
274 *	- start  - virtual start address
275 *	- end	 - virtual end address
276 */
277xsc3_dma_inv_range:
278	tst	r0, #CACHELINESIZE - 1
279	bic	r0, r0, #CACHELINESIZE - 1
280	mcrne	p15, 0, r0, c7, c10, 1		@ clean L1 D line
281	tst	r1, #CACHELINESIZE - 1
282	mcrne	p15, 0, r1, c7, c10, 1		@ clean L1 D line
2831:	mcr	p15, 0, r0, c7, c6, 1		@ invalidate L1 D line
284	add	r0, r0, #CACHELINESIZE
285	cmp	r0, r1
286	blo	1b
287	mcr	p15, 0, r0, c7, c10, 4		@ data write barrier
288	ret	lr
289
290/*
291 *	dma_clean_range(start, end)
292 *
293 *	Clean the specified virtual address range.
294 *
295 *	- start  - virtual start address
296 *	- end	 - virtual end address
297 */
298xsc3_dma_clean_range:
299	bic	r0, r0, #CACHELINESIZE - 1
3001:	mcr	p15, 0, r0, c7, c10, 1		@ clean L1 D line
301	add	r0, r0, #CACHELINESIZE
302	cmp	r0, r1
303	blo	1b
304	mcr	p15, 0, r0, c7, c10, 4		@ data write barrier
305	ret	lr
306
307/*
308 *	dma_flush_range(start, end)
309 *
310 *	Clean and invalidate the specified virtual address range.
311 *
312 *	- start  - virtual start address
313 *	- end	 - virtual end address
314 */
315SYM_TYPED_FUNC_START(xsc3_dma_flush_range)
316	bic	r0, r0, #CACHELINESIZE - 1
3171:	mcr	p15, 0, r0, c7, c14, 1		@ clean/invalidate L1 D line
318	add	r0, r0, #CACHELINESIZE
319	cmp	r0, r1
320	blo	1b
321	mcr	p15, 0, r0, c7, c10, 4		@ data write barrier
322	ret	lr
323SYM_FUNC_END(xsc3_dma_flush_range)
324
325/*
326 *	dma_map_area(start, size, dir)
327 *	- start	- kernel virtual start address
328 *	- size	- size of region
329 *	- dir	- DMA direction
330 */
331SYM_TYPED_FUNC_START(xsc3_dma_map_area)
332	add	r1, r1, r0
333	cmp	r2, #DMA_TO_DEVICE
334	beq	xsc3_dma_clean_range
335	bcs	xsc3_dma_inv_range
336	b	xsc3_dma_flush_range
337SYM_FUNC_END(xsc3_dma_map_area)
338
339/*
340 *	dma_unmap_area(start, size, dir)
341 *	- start	- kernel virtual start address
342 *	- size	- size of region
343 *	- dir	- DMA direction
344 */
345SYM_TYPED_FUNC_START(xsc3_dma_unmap_area)
346	ret	lr
347SYM_FUNC_END(xsc3_dma_unmap_area)
348
349SYM_TYPED_FUNC_START(cpu_xsc3_dcache_clean_area)
3501:	mcr	p15, 0, r0, c7, c10, 1		@ clean L1 D line
351	add	r0, r0, #CACHELINESIZE
352	subs	r1, r1, #CACHELINESIZE
353	bhi	1b
354	ret	lr
355SYM_FUNC_END(cpu_xsc3_dcache_clean_area)
356
357/* =============================== PageTable ============================== */
358
359/*
360 * cpu_xsc3_switch_mm(pgd)
361 *
362 * Set the translation base pointer to be as described by pgd.
363 *
364 * pgd: new page tables
365 */
366	.align	5
367SYM_TYPED_FUNC_START(cpu_xsc3_switch_mm)
368	clean_d_cache r1, r2
369	mcr	p15, 0, ip, c7, c5, 0		@ invalidate L1 I cache and BTB
370	mcr	p15, 0, ip, c7, c10, 4		@ data write barrier
371	mcr	p15, 0, ip, c7, c5, 4		@ prefetch flush
372	orr	r0, r0, #0x18			@ cache the page table in L2
373	mcr	p15, 0, r0, c2, c0, 0		@ load page table pointer
374	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I and D TLBs
375	cpwait_ret lr, ip
376SYM_FUNC_END(cpu_xsc3_switch_mm)
377
378/*
379 * cpu_xsc3_set_pte_ext(ptep, pte, ext)
380 *
381 * Set a PTE and flush it out
382 */
383cpu_xsc3_mt_table:
384	.long	0x00						@ L_PTE_MT_UNCACHED
385	.long	PTE_EXT_TEX(1)					@ L_PTE_MT_BUFFERABLE
386	.long	PTE_EXT_TEX(5) | PTE_CACHEABLE			@ L_PTE_MT_WRITETHROUGH
387	.long	PTE_CACHEABLE | PTE_BUFFERABLE			@ L_PTE_MT_WRITEBACK
388	.long	PTE_EXT_TEX(1) | PTE_BUFFERABLE			@ L_PTE_MT_DEV_SHARED
389	.long	0x00						@ unused
390	.long	0x00						@ L_PTE_MT_MINICACHE (not present)
391	.long	PTE_EXT_TEX(5) | PTE_CACHEABLE | PTE_BUFFERABLE	@ L_PTE_MT_WRITEALLOC (not present?)
392	.long	0x00						@ unused
393	.long	PTE_EXT_TEX(1)					@ L_PTE_MT_DEV_WC
394	.long	0x00						@ unused
395	.long	PTE_CACHEABLE | PTE_BUFFERABLE			@ L_PTE_MT_DEV_CACHED
396	.long	PTE_EXT_TEX(2)					@ L_PTE_MT_DEV_NONSHARED
397	.long	0x00						@ unused
398	.long	0x00						@ unused
399	.long	0x00						@ unused
400
401	.align	5
402SYM_TYPED_FUNC_START(cpu_xsc3_set_pte_ext)
403	xscale_set_pte_ext_prologue
404
405	tst	r1, #L_PTE_SHARED		@ shared?
406	and	r1, r1, #L_PTE_MT_MASK
407	adr	ip, cpu_xsc3_mt_table
408	ldr	ip, [ip, r1]
409	orrne	r2, r2, #PTE_EXT_COHERENT	@ interlock: mask in coherent bit
410	bic	r2, r2, #0x0c			@ clear old C,B bits
411	orr	r2, r2, ip
412
413	xscale_set_pte_ext_epilogue
414	ret	lr
415SYM_FUNC_END(cpu_xsc3_set_pte_ext)
416
417	.ltorg
418	.align
419
420.globl	cpu_xsc3_suspend_size
421.equ	cpu_xsc3_suspend_size, 4 * 6
422#ifdef CONFIG_ARM_CPU_SUSPEND
423SYM_TYPED_FUNC_START(cpu_xsc3_do_suspend)
424	stmfd	sp!, {r4 - r9, lr}
425	mrc	p14, 0, r4, c6, c0, 0	@ clock configuration, for turbo mode
426	mrc	p15, 0, r5, c15, c1, 0	@ CP access reg
427	mrc	p15, 0, r6, c13, c0, 0	@ PID
428	mrc 	p15, 0, r7, c3, c0, 0	@ domain ID
429	mrc	p15, 0, r8, c1, c0, 1	@ auxiliary control reg
430	mrc 	p15, 0, r9, c1, c0, 0	@ control reg
431	bic	r4, r4, #2		@ clear frequency change bit
432	stmia	r0, {r4 - r9}		@ store cp regs
433	ldmia	sp!, {r4 - r9, pc}
434SYM_FUNC_END(cpu_xsc3_do_suspend)
435
436SYM_TYPED_FUNC_START(cpu_xsc3_do_resume)
437	ldmia	r0, {r4 - r9}		@ load cp regs
438	mov	ip, #0
439	mcr	p15, 0, ip, c7, c7, 0	@ invalidate I & D caches, BTB
440	mcr	p15, 0, ip, c7, c10, 4	@ drain write (&fill) buffer
441	mcr	p15, 0, ip, c7, c5, 4	@ flush prefetch buffer
442	mcr	p15, 0, ip, c8, c7, 0	@ invalidate I & D TLBs
443	mcr	p14, 0, r4, c6, c0, 0	@ clock configuration, turbo mode.
444	mcr	p15, 0, r5, c15, c1, 0	@ CP access reg
445	mcr	p15, 0, r6, c13, c0, 0	@ PID
446	mcr	p15, 0, r7, c3, c0, 0	@ domain ID
447	orr	r1, r1, #0x18		@ cache the page table in L2
448	mcr	p15, 0, r1, c2, c0, 0	@ translation table base addr
449	mcr	p15, 0, r8, c1, c0, 1	@ auxiliary control reg
450	mov	r0, r9			@ control register
451	b	cpu_resume_mmu
452SYM_FUNC_END(cpu_xsc3_do_resume)
453#endif
454
455	.type	__xsc3_setup, #function
456__xsc3_setup:
457	mov	r0, #PSR_F_BIT|PSR_I_BIT|SVC_MODE
458	msr	cpsr_c, r0
459	mcr	p15, 0, ip, c7, c7, 0		@ invalidate L1 caches and BTB
460	mcr	p15, 0, ip, c7, c10, 4		@ data write barrier
461	mcr	p15, 0, ip, c7, c5, 4		@ prefetch flush
462	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I and D TLBs
463	orr	r4, r4, #0x18			@ cache the page table in L2
464	mcr	p15, 0, r4, c2, c0, 0		@ load page table pointer
465
466	mov	r0, #1 << 6			@ cp6 access for early sched_clock
467	mcr	p15, 0, r0, c15, c1, 0		@ write CP access register
468
469	mrc	p15, 0, r0, c1, c0, 1		@ get auxiliary control reg
470	and	r0, r0, #2			@ preserve bit P bit setting
471	orr	r0, r0, #(1 << 10)		@ enable L2 for LLR cache
472	mcr	p15, 0, r0, c1, c0, 1		@ set auxiliary control reg
473
474	adr	r5, xsc3_crval
475	ldmia	r5, {r5, r6}
476
477#ifdef CONFIG_CACHE_XSC3L2
478	mrc	p15, 1, r0, c0, c0, 1		@ get L2 present information
479	ands	r0, r0, #0xf8
480	orrne	r6, r6, #(1 << 26)		@ enable L2 if present
481#endif
482
483	mrc	p15, 0, r0, c1, c0, 0		@ get control register
484	bic	r0, r0, r5			@ ..V. ..R. .... ..A.
485	orr	r0, r0, r6			@ ..VI Z..S .... .C.M (mmu)
486						@ ...I Z..S .... .... (uc)
487	ret	lr
488
489	.size	__xsc3_setup, . - __xsc3_setup
490
491	.type	xsc3_crval, #object
492xsc3_crval:
493	crval	clear=0x04002202, mmuset=0x00003905, ucset=0x00001900
494
495	__INITDATA
496
497	@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
498	define_processor_functions xsc3, dabort=v5t_early_abort, pabort=legacy_pabort, suspend=1
499
500	.section ".rodata"
501
502	string	cpu_arch_name, "armv5te"
503	string	cpu_elf_name, "v5"
504	string	cpu_xsc3_name, "XScale-V3 based processor"
505
506	.align
507
508	.section ".proc.info.init", "a"
509
510.macro xsc3_proc_info name:req, cpu_val:req, cpu_mask:req
511	.type	__\name\()_proc_info,#object
512__\name\()_proc_info:
513	.long	\cpu_val
514	.long	\cpu_mask
515	.long	PMD_TYPE_SECT | \
516		PMD_SECT_BUFFERABLE | \
517		PMD_SECT_CACHEABLE | \
518		PMD_SECT_AP_WRITE | \
519		PMD_SECT_AP_READ
520	.long	PMD_TYPE_SECT | \
521		PMD_SECT_AP_WRITE | \
522		PMD_SECT_AP_READ
523	initfn	__xsc3_setup, __\name\()_proc_info
524	.long	cpu_arch_name
525	.long	cpu_elf_name
526	.long	HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
527	.long	cpu_xsc3_name
528	.long	xsc3_processor_functions
529	.long	v4wbi_tlb_fns
530	.long	xsc3_mc_user_fns
531	.long	xsc3_cache_fns
532	.size	__\name\()_proc_info, . - __\name\()_proc_info
533.endm
534
535	xsc3_proc_info xsc3, 0x69056000, 0xffffe000
536
537/* Note: PXA935 changed its implementor ID from Intel to Marvell */
538	xsc3_proc_info xsc3_pxa935, 0x56056000, 0xffffe000
539