1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * linux/arch/arm/mm/cache-v7.S
5 * Copyright (C) 2001 Deep Blue Solutions Ltd.
6 * Copyright (C) 2005 ARM Ltd.
8 * This is the "shell" of the ARMv7 processor support.
10 #include <linux/linkage.h>
11 #include <linux/init.h>
12 #include <asm/assembler.h>
13 #include <asm/errno.h>
14 #include <asm/unwind.h>
15 #include <asm/hardware/cache-b15-rac.h>
17 #include "proc-macros.S"
20 * The secondary kernel init calls v7_flush_dcache_all before it enables
21 * the L1; however, the L1 comes out of reset in an undefined state, so
22 * the clean + invalidate performed by v7_flush_dcache_all causes a bunch
23 * of cache lines with uninitialized data and uninitialized tags to get
24 * written out to memory, which does really unpleasant things to the main
25 * processor. We fix this by performing an invalidate, rather than a
26 * clean + invalidate, before jumping into the kernel.
28 * This function is cloned from arch/arm/mach-tegra/headsmp.S, and needs
29 * to be called for both secondary cores startup and primary core resume
32 ENTRY(v7_invalidate_l1)
34 mcr p15, 2, r0, c0, c0, 0
35 mrc p15, 1, r0, c0, c0, 0
38 and r2, r1, r0, lsr #13
42 and r3, r1, r0, lsr #3 @ NumWays - 1
43 add r2, r2, #1 @ NumSets
46 add r0, r0, #4 @ SetShift
49 add r4, r3, #1 @ NumWays
50 1: sub r2, r2, #1 @ NumSets--
51 mov r3, r4 @ Temp = NumWays
52 2: subs r3, r3, #1 @ Temp--
55 orr r5, r5, r6 @ Reg = (Temp<<WayShift)|(NumSets<<SetShift)
56 mcr p15, 0, r5, c7, c6, 2
63 ENDPROC(v7_invalidate_l1)
66 * v7_flush_icache_all()
68 * Flush the whole I-cache.
73 ENTRY(v7_flush_icache_all)
75 ALT_SMP(mcr p15, 0, r0, c7, c1, 0) @ invalidate I-cache inner shareable
76 ALT_UP(mcr p15, 0, r0, c7, c5, 0) @ I+BTB cache invalidate
78 ENDPROC(v7_flush_icache_all)
81 * v7_flush_dcache_louis()
83 * Flush the D-cache up to the Level of Unification Inner Shareable
85 * Corrupted registers: r0-r7, r9-r11 (r6 only in Thumb mode)
88 ENTRY(v7_flush_dcache_louis)
89 dmb @ ensure ordering with previous memory accesses
90 mrc p15, 1, r0, c0, c0, 1 @ read clidr, r0 = clidr
91 ALT_SMP(mov r3, r0, lsr #20) @ move LoUIS into position
92 ALT_UP( mov r3, r0, lsr #26) @ move LoUU into position
93 ands r3, r3, #7 << 1 @ extract LoU*2 field from clidr
94 bne start_flush_levels @ LoU != 0, start flushing
95 #ifdef CONFIG_ARM_ERRATA_643719
96 ALT_SMP(mrc p15, 0, r2, c0, c0, 0) @ read main ID register
97 ALT_UP( ret lr) @ LoUU is zero, so nothing to do
98 movw r1, #:lower16:(0x410fc090 >> 4) @ ID of ARM Cortex A9 r0p?
99 movt r1, #:upper16:(0x410fc090 >> 4)
100 teq r1, r2, lsr #4 @ test for errata affected core and if so...
101 moveq r3, #1 << 1 @ fix LoUIS value
102 beq start_flush_levels @ start flushing cache levels
105 ENDPROC(v7_flush_dcache_louis)
108 * v7_flush_dcache_all()
110 * Flush the whole D-cache.
112 * Corrupted registers: r0-r7, r9-r11 (r6 only in Thumb mode)
114 * - mm - mm_struct describing address space
116 ENTRY(v7_flush_dcache_all)
117 dmb @ ensure ordering with previous memory accesses
118 mrc p15, 1, r0, c0, c0, 1 @ read clidr
119 mov r3, r0, lsr #23 @ move LoC into position
120 ands r3, r3, #7 << 1 @ extract LoC*2 from clidr
121 beq finished @ if loc is 0, then no need to clean
123 mov r10, #0 @ start clean at cache level 0
125 add r2, r10, r10, lsr #1 @ work out 3x current cache level
126 mov r1, r0, lsr r2 @ extract cache type bits from clidr
127 and r1, r1, #7 @ mask of the bits for current cache only
128 cmp r1, #2 @ see what cache we have at this level
129 blt skip @ skip if no cache, or just i-cache
130 #ifdef CONFIG_PREEMPT
131 save_and_disable_irqs_notrace r9 @ make cssr&csidr read atomic
133 mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
134 isb @ isb to sych the new cssr&csidr
135 mrc p15, 1, r1, c0, c0, 0 @ read the new csidr
136 #ifdef CONFIG_PREEMPT
137 restore_irqs_notrace r9
139 and r2, r1, #7 @ extract the length of the cache lines
140 add r2, r2, #4 @ add 4 (line length offset)
142 ands r4, r4, r1, lsr #3 @ find maximum number on the way size
143 clz r5, r4 @ find bit position of way size increment
145 ands r7, r7, r1, lsr #13 @ extract max number of the index size
147 mov r9, r7 @ create working copy of max index
149 ARM( orr r11, r10, r4, lsl r5 ) @ factor way and cache number into r11
150 THUMB( lsl r6, r4, r5 )
151 THUMB( orr r11, r10, r6 ) @ factor way and cache number into r11
152 ARM( orr r11, r11, r9, lsl r2 ) @ factor index number into r11
153 THUMB( lsl r6, r9, r2 )
154 THUMB( orr r11, r11, r6 ) @ factor index number into r11
155 mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way
156 subs r9, r9, #1 @ decrement the index
158 subs r4, r4, #1 @ decrement the way
161 add r10, r10, #2 @ increment cache number
165 mov r10, #0 @ switch back to cache level 0
166 mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
170 ENDPROC(v7_flush_dcache_all)
173 * v7_flush_cache_all()
175 * Flush the entire cache system.
176 * The data cache flush is now achieved using atomic clean / invalidates
177 * working outwards from L1 cache. This is done using Set/Way based cache
178 * maintenance instructions.
179 * The instruction cache can still be invalidated back to the point of
180 * unification in a single instruction.
183 ENTRY(v7_flush_kern_cache_all)
184 ARM( stmfd sp!, {r4-r5, r7, r9-r11, lr} )
185 THUMB( stmfd sp!, {r4-r7, r9-r11, lr} )
186 bl v7_flush_dcache_all
188 ALT_SMP(mcr p15, 0, r0, c7, c1, 0) @ invalidate I-cache inner shareable
189 ALT_UP(mcr p15, 0, r0, c7, c5, 0) @ I+BTB cache invalidate
190 ARM( ldmfd sp!, {r4-r5, r7, r9-r11, lr} )
191 THUMB( ldmfd sp!, {r4-r7, r9-r11, lr} )
193 ENDPROC(v7_flush_kern_cache_all)
196 * v7_flush_kern_cache_louis(void)
198 * Flush the data cache up to Level of Unification Inner Shareable.
199 * Invalidate the I-cache to the point of unification.
201 ENTRY(v7_flush_kern_cache_louis)
202 ARM( stmfd sp!, {r4-r5, r7, r9-r11, lr} )
203 THUMB( stmfd sp!, {r4-r7, r9-r11, lr} )
204 bl v7_flush_dcache_louis
206 ALT_SMP(mcr p15, 0, r0, c7, c1, 0) @ invalidate I-cache inner shareable
207 ALT_UP(mcr p15, 0, r0, c7, c5, 0) @ I+BTB cache invalidate
208 ARM( ldmfd sp!, {r4-r5, r7, r9-r11, lr} )
209 THUMB( ldmfd sp!, {r4-r7, r9-r11, lr} )
211 ENDPROC(v7_flush_kern_cache_louis)
214 * v7_flush_cache_all()
216 * Flush all TLB entries in a particular address space
218 * - mm - mm_struct describing address space
220 ENTRY(v7_flush_user_cache_all)
224 * v7_flush_cache_range(start, end, flags)
226 * Flush a range of TLB entries in the specified address space.
228 * - start - start address (may not be aligned)
229 * - end - end address (exclusive, may not be aligned)
230 * - flags - vm_area_struct flags describing address space
232 * It is assumed that:
233 * - we have a VIPT cache.
235 ENTRY(v7_flush_user_cache_range)
237 ENDPROC(v7_flush_user_cache_all)
238 ENDPROC(v7_flush_user_cache_range)
241 * v7_coherent_kern_range(start,end)
243 * Ensure that the I and D caches are coherent within specified
244 * region. This is typically used when code has been written to
245 * a memory region, and will be executed.
247 * - start - virtual start address of region
248 * - end - virtual end address of region
250 * It is assumed that:
251 * - the Icache does not read data from the write buffer
253 ENTRY(v7_coherent_kern_range)
257 * v7_coherent_user_range(start,end)
259 * Ensure that the I and D caches are coherent within specified
260 * region. This is typically used when code has been written to
261 * a memory region, and will be executed.
263 * - start - virtual start address of region
264 * - end - virtual end address of region
266 * It is assumed that:
267 * - the Icache does not read data from the write buffer
269 ENTRY(v7_coherent_user_range)
271 dcache_line_size r2, r3
274 #ifdef CONFIG_ARM_ERRATA_764369
279 USER( mcr p15, 0, r12, c7, c11, 1 ) @ clean D line to the point of unification
284 icache_line_size r2, r3
288 USER( mcr p15, 0, r12, c7, c5, 1 ) @ invalidate I line
293 ALT_SMP(mcr p15, 0, r0, c7, c1, 6) @ invalidate BTB Inner Shareable
294 ALT_UP(mcr p15, 0, r0, c7, c5, 6) @ invalidate BTB
300 * Fault handling for the cache operation above. If the virtual address in r0
301 * isn't mapped, fail with -EFAULT.
304 #ifdef CONFIG_ARM_ERRATA_775420
310 ENDPROC(v7_coherent_kern_range)
311 ENDPROC(v7_coherent_user_range)
314 * v7_flush_kern_dcache_area(void *addr, size_t size)
316 * Ensure that the data held in the page kaddr is written back
317 * to the page in question.
319 * - addr - kernel address
320 * - size - region size
322 ENTRY(v7_flush_kern_dcache_area)
323 dcache_line_size r2, r3
327 #ifdef CONFIG_ARM_ERRATA_764369
332 mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line / unified line
338 ENDPROC(v7_flush_kern_dcache_area)
341 * v7_dma_inv_range(start,end)
343 * Invalidate the data cache within the specified region; we will
344 * be performing a DMA operation in this region and we want to
345 * purge old data in the cache.
347 * - start - virtual start address of region
348 * - end - virtual end address of region
351 dcache_line_size r2, r3
355 #ifdef CONFIG_ARM_ERRATA_764369
359 mcrne p15, 0, r0, c7, c14, 1 @ clean & invalidate D / U line
364 mcrne p15, 0, r1, c7, c14, 1 @ clean & invalidate D / U line
367 mcrlo p15, 0, r0, c7, c6, 1 @ invalidate D / U line
373 ENDPROC(v7_dma_inv_range)
376 * v7_dma_clean_range(start,end)
377 * - start - virtual start address of region
378 * - end - virtual end address of region
381 dcache_line_size r2, r3
384 #ifdef CONFIG_ARM_ERRATA_764369
389 mcr p15, 0, r0, c7, c10, 1 @ clean D / U line
395 ENDPROC(v7_dma_clean_range)
398 * v7_dma_flush_range(start,end)
399 * - start - virtual start address of region
400 * - end - virtual end address of region
402 ENTRY(v7_dma_flush_range)
403 dcache_line_size r2, r3
406 #ifdef CONFIG_ARM_ERRATA_764369
411 mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D / U line
417 ENDPROC(v7_dma_flush_range)
420 * dma_map_area(start, size, dir)
421 * - start - kernel virtual start address
422 * - size - size of region
423 * - dir - DMA direction
425 ENTRY(v7_dma_map_area)
427 teq r2, #DMA_FROM_DEVICE
430 ENDPROC(v7_dma_map_area)
433 * dma_unmap_area(start, size, dir)
434 * - start - kernel virtual start address
435 * - size - size of region
436 * - dir - DMA direction
438 ENTRY(v7_dma_unmap_area)
440 teq r2, #DMA_TO_DEVICE
443 ENDPROC(v7_dma_unmap_area)
447 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
448 define_cache_functions v7
450 /* The Broadcom Brahma-B15 read-ahead cache requires some modifications
451 * to the v7_cache_fns, we only override the ones we need
453 #ifndef CONFIG_CACHE_B15_RAC
454 globl_equ b15_flush_kern_cache_all, v7_flush_kern_cache_all
456 globl_equ b15_flush_icache_all, v7_flush_icache_all
457 globl_equ b15_flush_kern_cache_louis, v7_flush_kern_cache_louis
458 globl_equ b15_flush_user_cache_all, v7_flush_user_cache_all
459 globl_equ b15_flush_user_cache_range, v7_flush_user_cache_range
460 globl_equ b15_coherent_kern_range, v7_coherent_kern_range
461 globl_equ b15_coherent_user_range, v7_coherent_user_range
462 globl_equ b15_flush_kern_dcache_area, v7_flush_kern_dcache_area
464 globl_equ b15_dma_map_area, v7_dma_map_area
465 globl_equ b15_dma_unmap_area, v7_dma_unmap_area
466 globl_equ b15_dma_flush_range, v7_dma_flush_range
468 define_cache_functions b15