1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * linux/arch/arm/mm/arm946.S: utility functions for ARM946E-S
5 * Copyright (C) 2004-2006 Hyok S. Choi (hyok.choi@samsung.com)
7 * (Many of cache codes are from proc-arm926.S)
9 #include <linux/linkage.h>
10 #include <linux/init.h>
11 #include <linux/cfi_types.h>
12 #include <linux/pgtable.h>
13 #include <asm/assembler.h>
14 #include <asm/hwcap.h>
15 #include <asm/pgtable-hwdef.h>
16 #include <asm/ptrace.h>
17 #include "proc-macros.S"
20 * ARM946E-S is synthesizable to have 0KB to 1MB sized D-Cache,
21 * comprising 256 lines of 32 bytes (8 words).
23 #define CACHE_DSIZE (CONFIG_CPU_DCACHE_SIZE) /* typically 8KB. */
24 #define CACHE_DLINESIZE 32 /* fixed */
25 #define CACHE_DSEGMENTS 4 /* fixed */
26 #define CACHE_DENTRIES (CACHE_DSIZE / CACHE_DSEGMENTS / CACHE_DLINESIZE)
27 #define CACHE_DLIMIT (CACHE_DSIZE * 4) /* benchmark needed */
31 * cpu_arm946_proc_init()
32 * cpu_arm946_switch_mm()
34 * These are not required.
36 SYM_TYPED_FUNC_START(cpu_arm946_proc_init)
38 SYM_FUNC_END(cpu_arm946_proc_init)
40 SYM_TYPED_FUNC_START(cpu_arm946_switch_mm)
42 SYM_FUNC_END(cpu_arm946_switch_mm)
45 * cpu_arm946_proc_fin()
47 SYM_TYPED_FUNC_START(cpu_arm946_proc_fin)
48 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
49 bic r0, r0, #0x00001000 @ i-cache
50 bic r0, r0, #0x00000004 @ d-cache
51 mcr p15, 0, r0, c1, c0, 0 @ disable caches
53 SYM_FUNC_END(cpu_arm946_proc_fin)
56 * cpu_arm946_reset(loc)
57 * Params : r0 = address to jump to
58 * Notes : This sets up everything for a reset
60 .pushsection .idmap.text, "ax"
61 SYM_TYPED_FUNC_START(cpu_arm946_reset)
63 mcr p15, 0, ip, c7, c5, 0 @ flush I cache
64 mcr p15, 0, ip, c7, c6, 0 @ flush D cache
65 mcr p15, 0, ip, c7, c10, 4 @ drain WB
66 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
67 bic ip, ip, #0x00000005 @ .............c.p
68 bic ip, ip, #0x00001000 @ i-cache
69 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
71 SYM_FUNC_END(cpu_arm946_reset)
75 * cpu_arm946_do_idle()
78 SYM_TYPED_FUNC_START(cpu_arm946_do_idle)
79 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
81 SYM_FUNC_END(cpu_arm946_do_idle)
86 * Unconditionally clean and invalidate the entire icache.
88 SYM_TYPED_FUNC_START(arm946_flush_icache_all)
90 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
92 SYM_FUNC_END(arm946_flush_icache_all)
95 * flush_user_cache_all()
97 SYM_FUNC_ALIAS(arm946_flush_user_cache_all, arm946_flush_kern_cache_all)
100 * flush_kern_cache_all()
102 * Clean and invalidate the entire cache.
104 SYM_TYPED_FUNC_START(arm946_flush_kern_cache_all)
108 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
109 mcr p15, 0, ip, c7, c6, 0 @ flush D cache
111 mov r1, #(CACHE_DSEGMENTS - 1) << 29 @ 4 segments
112 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 4 @ n entries
113 2: mcr p15, 0, r3, c7, c14, 2 @ clean/flush D index
115 bcs 2b @ entries n to 0
116 subs r1, r1, #1 << 29
117 bcs 1b @ segments 3 to 0
120 mcrne p15, 0, ip, c7, c5, 0 @ flush I cache
121 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
123 SYM_FUNC_END(arm946_flush_kern_cache_all)
126 * flush_user_cache_range(start, end, flags)
128 * Clean and invalidate a range of cache entries in the
129 * specified address range.
131 * - start - start address (inclusive)
132 * - end - end address (exclusive)
133 * - flags - vm_flags describing address space
136 SYM_TYPED_FUNC_START(arm946_flush_user_cache_range)
138 sub r3, r1, r0 @ calculate total size
139 cmp r3, #CACHE_DLIMIT
140 bhs __flush_whole_cache
143 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
144 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
145 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
146 add r0, r0, #CACHE_DLINESIZE
147 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
148 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
149 add r0, r0, #CACHE_DLINESIZE
151 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
152 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
153 add r0, r0, #CACHE_DLINESIZE
154 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
155 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
156 add r0, r0, #CACHE_DLINESIZE
161 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
163 SYM_FUNC_END(arm946_flush_user_cache_range)
166 * coherent_kern_range(start, end)
168 * Ensure coherency between the Icache and the Dcache in the
169 * region described by start, end. If you have non-snooping
170 * Harvard caches, you need to implement this function.
172 * - start - virtual start address
173 * - end - virtual end address
175 SYM_TYPED_FUNC_START(arm946_coherent_kern_range)
176 #ifdef CONFIG_CFI_CLANG /* Fallthrough if !CFI */
177 b arm946_coherent_user_range
179 SYM_FUNC_END(arm946_coherent_kern_range)
182 * coherent_user_range(start, end)
184 * Ensure coherency between the Icache and the Dcache in the
185 * region described by start, end. If you have non-snooping
186 * Harvard caches, you need to implement this function.
188 * - start - virtual start address
189 * - end - virtual end address
192 SYM_TYPED_FUNC_START(arm946_coherent_user_range)
193 bic r0, r0, #CACHE_DLINESIZE - 1
194 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
195 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
196 add r0, r0, #CACHE_DLINESIZE
199 mcr p15, 0, r0, c7, c10, 4 @ drain WB
202 SYM_FUNC_END(arm946_coherent_user_range)
205 * flush_kern_dcache_area(void *addr, size_t size)
207 * Ensure no D cache aliasing occurs, either with itself or
210 * - addr - kernel address
211 * - size - region size
214 SYM_TYPED_FUNC_START(arm946_flush_kern_dcache_area)
216 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
217 add r0, r0, #CACHE_DLINESIZE
221 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
222 mcr p15, 0, r0, c7, c10, 4 @ drain WB
224 SYM_FUNC_END(arm946_flush_kern_dcache_area)
227 * dma_inv_range(start, end)
229 * Invalidate (discard) the specified virtual address range.
230 * May not write back any entries. If 'start' or 'end'
231 * are not cache line aligned, those lines must be written
234 * - start - virtual start address
235 * - end - virtual end address
238 arm946_dma_inv_range:
239 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
240 tst r0, #CACHE_DLINESIZE - 1
241 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
242 tst r1, #CACHE_DLINESIZE - 1
243 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
245 bic r0, r0, #CACHE_DLINESIZE - 1
246 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
247 add r0, r0, #CACHE_DLINESIZE
250 mcr p15, 0, r0, c7, c10, 4 @ drain WB
254 * dma_clean_range(start, end)
256 * Clean the specified virtual address range.
258 * - start - virtual start address
259 * - end - virtual end address
263 arm946_dma_clean_range:
264 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
265 bic r0, r0, #CACHE_DLINESIZE - 1
266 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
267 add r0, r0, #CACHE_DLINESIZE
271 mcr p15, 0, r0, c7, c10, 4 @ drain WB
275 * dma_flush_range(start, end)
277 * Clean and invalidate the specified virtual address range.
279 * - start - virtual start address
280 * - end - virtual end address
284 SYM_TYPED_FUNC_START(arm946_dma_flush_range)
285 bic r0, r0, #CACHE_DLINESIZE - 1
287 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
288 mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
290 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
292 add r0, r0, #CACHE_DLINESIZE
295 mcr p15, 0, r0, c7, c10, 4 @ drain WB
297 SYM_FUNC_END(arm946_dma_flush_range)
300 * dma_map_area(start, size, dir)
301 * - start - kernel virtual start address
302 * - size - size of region
303 * - dir - DMA direction
305 SYM_TYPED_FUNC_START(arm946_dma_map_area)
307 cmp r2, #DMA_TO_DEVICE
308 beq arm946_dma_clean_range
309 bcs arm946_dma_inv_range
310 b arm946_dma_flush_range
311 SYM_FUNC_END(arm946_dma_map_area)
314 * dma_unmap_area(start, size, dir)
315 * - start - kernel virtual start address
316 * - size - size of region
317 * - dir - DMA direction
319 SYM_TYPED_FUNC_START(arm946_dma_unmap_area)
321 SYM_FUNC_END(arm946_dma_unmap_area)
323 SYM_TYPED_FUNC_START(cpu_arm946_dcache_clean_area)
324 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
325 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
326 add r0, r0, #CACHE_DLINESIZE
327 subs r1, r1, #CACHE_DLINESIZE
330 mcr p15, 0, r0, c7, c10, 4 @ drain WB
332 SYM_FUNC_END(cpu_arm946_dcache_clean_area)
334 .type __arm946_setup, #function
337 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
338 mcr p15, 0, r0, c7, c6, 0 @ invalidate D cache
339 mcr p15, 0, r0, c7, c10, 4 @ drain WB
341 mcr p15, 0, r0, c6, c3, 0 @ disable memory region 3~7
342 mcr p15, 0, r0, c6, c4, 0
343 mcr p15, 0, r0, c6, c5, 0
344 mcr p15, 0, r0, c6, c6, 0
345 mcr p15, 0, r0, c6, c7, 0
347 mov r0, #0x0000003F @ base = 0, size = 4GB
348 mcr p15, 0, r0, c6, c0, 0 @ set region 0, default
350 ldr r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM
351 ldr r7, =CONFIG_DRAM_SIZE @ size of RAM (must be >= 4KB)
352 pr_val r3, r0, r7, #1
353 mcr p15, 0, r3, c6, c1, 0
355 ldr r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH
356 ldr r7, =CONFIG_FLASH_SIZE @ size of FLASH (must be >= 4KB)
357 pr_val r3, r0, r7, #1
358 mcr p15, 0, r3, c6, c2, 0
361 mcr p15, 0, r0, c2, c0, 0 @ region 1,2 d-cacheable
362 mcr p15, 0, r0, c2, c0, 1 @ region 1,2 i-cacheable
363 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
364 mov r0, #0x00 @ disable whole write buffer
366 mov r0, #0x02 @ region 1 write bufferred
368 mcr p15, 0, r0, c3, c0, 0
371 * Access Permission Settings for future permission control by PU.
374 * region 0 (whole) rw -- : b0001
375 * region 1 (RAM) rw rw : b0011
376 * region 2 (FLASH) rw r- : b0010
377 * region 3~7 (none) -- -- : b0000
380 orr r0, r0, #0x00000200
381 mcr p15, 0, r0, c5, c0, 2 @ set data access permission
382 mcr p15, 0, r0, c5, c0, 3 @ set inst. access permission
384 mrc p15, 0, r0, c1, c0 @ get control register
385 orr r0, r0, #0x00001000 @ I-cache
386 orr r0, r0, #0x00000005 @ MPU/D-cache
387 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
388 orr r0, r0, #0x00004000 @ .1.. .... .... ....
392 .size __arm946_setup, . - __arm946_setup
396 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
397 define_processor_functions arm946, dabort=nommu_early_abort, pabort=legacy_pabort, nommu=1
401 string cpu_arch_name, "armv5te"
402 string cpu_elf_name, "v5t"
403 string cpu_arm946_name, "ARM946E-S"
407 .section ".proc.info.init", "a"
408 .type __arm946_proc_info,#object
414 initfn __arm946_setup, __arm946_proc_info
417 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
418 .long cpu_arm946_name
419 .long arm946_processor_functions
422 .long arm946_cache_fns
423 .size __arm946_proc_info, . - __arm946_proc_info