2 * linux/arch/arm/mm/arm946.S: utility functions for ARM946E-S
4 * Copyright (C) 2004-2006 Hyok S. Choi (hyok.choi@samsung.com)
6 * (Many of cache codes are from proc-arm926.S)
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/linkage.h>
14 #include <linux/init.h>
15 #include <asm/assembler.h>
16 #include <asm/hwcap.h>
17 #include <asm/pgtable-hwdef.h>
18 #include <asm/pgtable.h>
19 #include <asm/ptrace.h>
20 #include "proc-macros.S"
23 * ARM946E-S is synthesizable to have 0KB to 1MB sized D-Cache,
24 * comprising 256 lines of 32 bytes (8 words).
26 #define CACHE_DSIZE (CONFIG_CPU_DCACHE_SIZE) /* typically 8KB. */
27 #define CACHE_DLINESIZE 32 /* fixed */
28 #define CACHE_DSEGMENTS 4 /* fixed */
29 #define CACHE_DENTRIES (CACHE_DSIZE / CACHE_DSEGMENTS / CACHE_DLINESIZE)
30 #define CACHE_DLIMIT (CACHE_DSIZE * 4) /* benchmark needed */
34 * cpu_arm946_proc_init()
35 * cpu_arm946_switch_mm()
37 * These are not required.
39 ENTRY(cpu_arm946_proc_init)
40 ENTRY(cpu_arm946_switch_mm)
44 * cpu_arm946_proc_fin()
46 ENTRY(cpu_arm946_proc_fin)
47 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
48 bic r0, r0, #0x00001000 @ i-cache
49 bic r0, r0, #0x00000004 @ d-cache
50 mcr p15, 0, r0, c1, c0, 0 @ disable caches
54 * cpu_arm946_reset(loc)
55 * Params : r0 = address to jump to
56 * Notes : This sets up everything for a reset
58 .pushsection .idmap.text, "ax"
59 ENTRY(cpu_arm946_reset)
61 mcr p15, 0, ip, c7, c5, 0 @ flush I cache
62 mcr p15, 0, ip, c7, c6, 0 @ flush D cache
63 mcr p15, 0, ip, c7, c10, 4 @ drain WB
64 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
65 bic ip, ip, #0x00000005 @ .............c.p
66 bic ip, ip, #0x00001000 @ i-cache
67 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
69 ENDPROC(cpu_arm946_reset)
73 * cpu_arm946_do_idle()
76 ENTRY(cpu_arm946_do_idle)
77 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
83 * Unconditionally clean and invalidate the entire icache.
85 ENTRY(arm946_flush_icache_all)
87 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
89 ENDPROC(arm946_flush_icache_all)
92 * flush_user_cache_all()
94 ENTRY(arm946_flush_user_cache_all)
98 * flush_kern_cache_all()
100 * Clean and invalidate the entire cache.
102 ENTRY(arm946_flush_kern_cache_all)
106 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
107 mcr p15, 0, ip, c7, c6, 0 @ flush D cache
109 mov r1, #(CACHE_DSEGMENTS - 1) << 29 @ 4 segments
110 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 4 @ n entries
111 2: mcr p15, 0, r3, c7, c14, 2 @ clean/flush D index
113 bcs 2b @ entries n to 0
114 subs r1, r1, #1 << 29
115 bcs 1b @ segments 3 to 0
118 mcrne p15, 0, ip, c7, c5, 0 @ flush I cache
119 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
123 * flush_user_cache_range(start, end, flags)
125 * Clean and invalidate a range of cache entries in the
126 * specified address range.
128 * - start - start address (inclusive)
129 * - end - end address (exclusive)
130 * - flags - vm_flags describing address space
133 ENTRY(arm946_flush_user_cache_range)
135 sub r3, r1, r0 @ calculate total size
136 cmp r3, #CACHE_DLIMIT
137 bhs __flush_whole_cache
140 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
141 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
142 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
143 add r0, r0, #CACHE_DLINESIZE
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
148 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
149 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
150 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
158 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
162 * coherent_kern_range(start, end)
164 * Ensure coherency between the Icache and the Dcache in the
165 * region described by start, end. If you have non-snooping
166 * Harvard caches, you need to implement this function.
168 * - start - virtual start address
169 * - end - virtual end address
171 ENTRY(arm946_coherent_kern_range)
175 * coherent_user_range(start, end)
177 * Ensure coherency between the Icache and the Dcache in the
178 * region described by start, end. If you have non-snooping
179 * Harvard caches, you need to implement this function.
181 * - start - virtual start address
182 * - end - virtual end address
185 ENTRY(arm946_coherent_user_range)
186 bic r0, r0, #CACHE_DLINESIZE - 1
187 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
188 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
189 add r0, r0, #CACHE_DLINESIZE
192 mcr p15, 0, r0, c7, c10, 4 @ drain WB
197 * flush_kern_dcache_area(void *addr, size_t size)
199 * Ensure no D cache aliasing occurs, either with itself or
202 * - addr - kernel address
203 * - size - region size
206 ENTRY(arm946_flush_kern_dcache_area)
208 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
209 add r0, r0, #CACHE_DLINESIZE
213 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
214 mcr p15, 0, r0, c7, c10, 4 @ drain WB
218 * dma_inv_range(start, end)
220 * Invalidate (discard) the specified virtual address range.
221 * May not write back any entries. If 'start' or 'end'
222 * are not cache line aligned, those lines must be written
225 * - start - virtual start address
226 * - end - virtual end address
229 arm946_dma_inv_range:
230 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
231 tst r0, #CACHE_DLINESIZE - 1
232 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
233 tst r1, #CACHE_DLINESIZE - 1
234 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
236 bic r0, r0, #CACHE_DLINESIZE - 1
237 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
238 add r0, r0, #CACHE_DLINESIZE
241 mcr p15, 0, r0, c7, c10, 4 @ drain WB
245 * dma_clean_range(start, end)
247 * Clean the specified virtual address range.
249 * - start - virtual start address
250 * - end - virtual end address
254 arm946_dma_clean_range:
255 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
256 bic r0, r0, #CACHE_DLINESIZE - 1
257 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
258 add r0, r0, #CACHE_DLINESIZE
262 mcr p15, 0, r0, c7, c10, 4 @ drain WB
266 * dma_flush_range(start, end)
268 * Clean and invalidate the specified virtual address range.
270 * - start - virtual start address
271 * - end - virtual end address
275 ENTRY(arm946_dma_flush_range)
276 bic r0, r0, #CACHE_DLINESIZE - 1
278 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
279 mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
281 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
283 add r0, r0, #CACHE_DLINESIZE
286 mcr p15, 0, r0, c7, c10, 4 @ drain WB
290 * dma_map_area(start, size, dir)
291 * - start - kernel virtual start address
292 * - size - size of region
293 * - dir - DMA direction
295 ENTRY(arm946_dma_map_area)
297 cmp r2, #DMA_TO_DEVICE
298 beq arm946_dma_clean_range
299 bcs arm946_dma_inv_range
300 b arm946_dma_flush_range
301 ENDPROC(arm946_dma_map_area)
304 * dma_unmap_area(start, size, dir)
305 * - start - kernel virtual start address
306 * - size - size of region
307 * - dir - DMA direction
309 ENTRY(arm946_dma_unmap_area)
311 ENDPROC(arm946_dma_unmap_area)
313 .globl arm946_flush_kern_cache_louis
314 .equ arm946_flush_kern_cache_louis, arm946_flush_kern_cache_all
316 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
317 define_cache_functions arm946
319 ENTRY(cpu_arm946_dcache_clean_area)
320 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
321 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
322 add r0, r0, #CACHE_DLINESIZE
323 subs r1, r1, #CACHE_DLINESIZE
326 mcr p15, 0, r0, c7, c10, 4 @ drain WB
329 .type __arm946_setup, #function
332 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
333 mcr p15, 0, r0, c7, c6, 0 @ invalidate D cache
334 mcr p15, 0, r0, c7, c10, 4 @ drain WB
336 mcr p15, 0, r0, c6, c3, 0 @ disable memory region 3~7
337 mcr p15, 0, r0, c6, c4, 0
338 mcr p15, 0, r0, c6, c5, 0
339 mcr p15, 0, r0, c6, c6, 0
340 mcr p15, 0, r0, c6, c7, 0
342 mov r0, #0x0000003F @ base = 0, size = 4GB
343 mcr p15, 0, r0, c6, c0, 0 @ set region 0, default
345 ldr r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM
346 ldr r1, =(CONFIG_DRAM_SIZE >> 12) @ size of RAM (must be >= 4KB)
347 mov r2, #10 @ 11 is the minimum (4KB)
348 1: add r2, r2, #1 @ area size *= 2
350 bne 1b @ count not zero r-shift
351 orr r0, r0, r2, lsl #1 @ the region register value
352 orr r0, r0, #1 @ set enable bit
353 mcr p15, 0, r0, c6, c1, 0 @ set region 1, RAM
355 ldr r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH
356 ldr r1, =(CONFIG_FLASH_SIZE >> 12) @ size of FLASH (must be >= 4KB)
357 mov r2, #10 @ 11 is the minimum (4KB)
358 1: add r2, r2, #1 @ area size *= 2
360 bne 1b @ count not zero r-shift
361 orr r0, r0, r2, lsl #1 @ the region register value
362 orr r0, r0, #1 @ set enable bit
363 mcr p15, 0, r0, c6, c2, 0 @ set region 2, ROM/FLASH
366 mcr p15, 0, r0, c2, c0, 0 @ region 1,2 d-cacheable
367 mcr p15, 0, r0, c2, c0, 1 @ region 1,2 i-cacheable
368 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
369 mov r0, #0x00 @ disable whole write buffer
371 mov r0, #0x02 @ region 1 write bufferred
373 mcr p15, 0, r0, c3, c0, 0
376 * Access Permission Settings for future permission control by PU.
379 * region 0 (whole) rw -- : b0001
380 * region 1 (RAM) rw rw : b0011
381 * region 2 (FLASH) rw r- : b0010
382 * region 3~7 (none) -- -- : b0000
385 orr r0, r0, #0x00000200
386 mcr p15, 0, r0, c5, c0, 2 @ set data access permission
387 mcr p15, 0, r0, c5, c0, 3 @ set inst. access permission
389 mrc p15, 0, r0, c1, c0 @ get control register
390 orr r0, r0, #0x00001000 @ I-cache
391 orr r0, r0, #0x00000005 @ MPU/D-cache
392 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
393 orr r0, r0, #0x00004000 @ .1.. .... .... ....
397 .size __arm946_setup, . - __arm946_setup
401 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
402 define_processor_functions arm946, dabort=nommu_early_abort, pabort=legacy_pabort, nommu=1
406 string cpu_arch_name, "armv5te"
407 string cpu_elf_name, "v5t"
408 string cpu_arm946_name, "ARM946E-S"
412 .section ".proc.info.init", #alloc, #execinstr
413 .type __arm946_proc_info,#object
422 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
423 .long cpu_arm946_name
424 .long arm946_processor_functions
427 .long arm946_cache_fns
428 .size __arm946_proc_info, . - __arm946_proc_info