2 * linux/arch/arm/mm/proc-v7.S
4 * Copyright (C) 2001 Deep Blue Solutions Ltd.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * This is the "shell" of the ARMv7 processor support.
12 #include <linux/init.h>
13 #include <linux/linkage.h>
14 #include <asm/assembler.h>
15 #include <asm/asm-offsets.h>
16 #include <asm/hwcap.h>
17 #include <asm/pgtable-hwdef.h>
18 #include <asm/pgtable.h>
20 #include "proc-macros.S"
22 #include "proc-v7-2level.S"
24 ENTRY(cpu_v7_proc_init)
26 ENDPROC(cpu_v7_proc_init)
28 ENTRY(cpu_v7_proc_fin)
29 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
30 bic r0, r0, #0x1000 @ ...i............
31 bic r0, r0, #0x0006 @ .............ca.
32 mcr p15, 0, r0, c1, c0, 0 @ disable caches
34 ENDPROC(cpu_v7_proc_fin)
39 * Perform a soft reset of the system. Put the CPU into the
40 * same state as it would be if it had been reset, and branch
41 * to what would be the reset vector.
43 * - loc - location to jump to for soft reset
45 * This code must be executed using a flat identity mapping with
49 .pushsection .idmap.text, "ax"
51 mrc p15, 0, r1, c1, c0, 0 @ ctrl register
52 bic r1, r1, #0x1 @ ...............m
53 THUMB( bic r1, r1, #1 << 30 ) @ SCTLR.TE (Thumb exceptions)
54 mcr p15, 0, r1, c1, c0, 0 @ disable MMU
63 * Idle the processor (eg, wait for interrupt).
65 * IRQs are already disabled.
68 dsb @ WFI may enter a low-power mode
71 ENDPROC(cpu_v7_do_idle)
73 ENTRY(cpu_v7_dcache_clean_area)
74 #ifndef TLB_CAN_READ_FROM_L1_CACHE
75 dcache_line_size r2, r3
76 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
83 ENDPROC(cpu_v7_dcache_clean_area)
85 string cpu_v7_name, "ARMv7 Processor"
88 /* Suspend/resume support: derived from arch/arm/mach-s5pv210/sleep.S */
89 .globl cpu_v7_suspend_size
90 .equ cpu_v7_suspend_size, 4 * 7
91 #ifdef CONFIG_ARM_CPU_SUSPEND
92 ENTRY(cpu_v7_do_suspend)
93 stmfd sp!, {r4 - r10, lr}
94 mrc p15, 0, r4, c13, c0, 0 @ FCSE/PID
95 mrc p15, 0, r5, c13, c0, 3 @ User r/o thread ID
97 mrc p15, 0, r6, c3, c0, 0 @ Domain ID
98 mrc p15, 0, r7, c2, c0, 1 @ TTB 1
99 mrc p15, 0, r8, c1, c0, 0 @ Control register
100 mrc p15, 0, r9, c1, c0, 1 @ Auxiliary control register
101 mrc p15, 0, r10, c1, c0, 2 @ Co-processor access control
103 ldmfd sp!, {r4 - r10, pc}
104 ENDPROC(cpu_v7_do_suspend)
106 ENTRY(cpu_v7_do_resume)
108 mcr p15, 0, ip, c8, c7, 0 @ invalidate TLBs
109 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
110 mcr p15, 0, ip, c13, c0, 1 @ set reserved context ID
112 mcr p15, 0, r4, c13, c0, 0 @ FCSE/PID
113 mcr p15, 0, r5, c13, c0, 3 @ User r/o thread ID
115 mcr p15, 0, r6, c3, c0, 0 @ Domain ID
116 ALT_SMP(orr r1, r1, #TTB_FLAGS_SMP)
117 ALT_UP(orr r1, r1, #TTB_FLAGS_UP)
118 mcr p15, 0, r1, c2, c0, 0 @ TTB 0
119 mcr p15, 0, r7, c2, c0, 1 @ TTB 1
120 mcr p15, 0, ip, c2, c0, 2 @ TTB control register
121 mrc p15, 0, r4, c1, c0, 1 @ Read Auxiliary control register
122 teq r4, r9 @ Is it already set?
123 mcrne p15, 0, r9, c1, c0, 1 @ No, so write it
124 mcr p15, 0, r10, c1, c0, 2 @ Co-processor access control
127 mcr p15, 0, r4, c10, c2, 0 @ write PRRR
128 mcr p15, 0, r5, c10, c2, 1 @ write NMRR
131 mov r0, r8 @ control register
133 ENDPROC(cpu_v7_do_resume)
141 * Initialise TLB, Caches, and MMU state ready to switch the MMU
142 * on. Return in r0 the new CP15 C1 control register setting.
144 * This should be able to cover all ARMv7 cores.
146 * It is assumed that:
147 * - cache type register is implemented
151 mov r10, #(1 << 0) @ TLB ops broadcasting
157 ALT_SMP(mrc p15, 0, r0, c1, c0, 1)
158 ALT_UP(mov r0, #(1 << 6)) @ fake it for UP
159 tst r0, #(1 << 6) @ SMP/nAMP mode enabled?
160 orreq r0, r0, #(1 << 6) @ Enable SMP/nAMP mode
161 orreq r0, r0, r10 @ Enable CPU-specific SMP bits
162 mcreq p15, 0, r0, c1, c0, 1
165 adr r12, __v7_setup_stack @ the local stack
166 stmia r12, {r0-r5, r7, r9, r11, lr}
167 bl v7_flush_dcache_all
168 ldmia r12, {r0-r5, r7, r9, r11, lr}
170 mrc p15, 0, r0, c0, c0, 0 @ read main ID register
171 and r10, r0, #0xff000000 @ ARM?
174 and r5, r0, #0x00f00000 @ variant
175 and r6, r0, #0x0000000f @ revision
176 orr r6, r6, r5, lsr #20-4 @ combine variant and revision
177 ubfx r0, r0, #4, #12 @ primary part number
179 /* Cortex-A8 Errata */
180 ldr r10, =0x00000c08 @ Cortex-A8 primary part number
183 #ifdef CONFIG_ARM_ERRATA_430973
184 teq r5, #0x00100000 @ only present in r1p*
185 mrceq p15, 0, r10, c1, c0, 1 @ read aux control register
186 orreq r10, r10, #(1 << 6) @ set IBE to 1
187 mcreq p15, 0, r10, c1, c0, 1 @ write aux control register
189 #ifdef CONFIG_ARM_ERRATA_458693
190 teq r6, #0x20 @ only present in r2p0
191 mrceq p15, 0, r10, c1, c0, 1 @ read aux control register
192 orreq r10, r10, #(1 << 5) @ set L1NEON to 1
193 orreq r10, r10, #(1 << 9) @ set PLDNOP to 1
194 mcreq p15, 0, r10, c1, c0, 1 @ write aux control register
196 #ifdef CONFIG_ARM_ERRATA_460075
197 teq r6, #0x20 @ only present in r2p0
198 mrceq p15, 1, r10, c9, c0, 2 @ read L2 cache aux ctrl register
200 orreq r10, r10, #(1 << 22) @ set the Write Allocate disable bit
201 mcreq p15, 1, r10, c9, c0, 2 @ write the L2 cache aux ctrl register
205 /* Cortex-A9 Errata */
206 2: ldr r10, =0x00000c09 @ Cortex-A9 primary part number
209 #ifdef CONFIG_ARM_ERRATA_742230
210 cmp r6, #0x22 @ only present up to r2p2
211 mrcle p15, 0, r10, c15, c0, 1 @ read diagnostic register
212 orrle r10, r10, #1 << 4 @ set bit #4
213 mcrle p15, 0, r10, c15, c0, 1 @ write diagnostic register
215 #ifdef CONFIG_ARM_ERRATA_742231
216 teq r6, #0x20 @ present in r2p0
217 teqne r6, #0x21 @ present in r2p1
218 teqne r6, #0x22 @ present in r2p2
219 mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register
220 orreq r10, r10, #1 << 12 @ set bit #12
221 orreq r10, r10, #1 << 22 @ set bit #22
222 mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register
224 #ifdef CONFIG_ARM_ERRATA_743622
225 teq r5, #0x00200000 @ only present in r2p*
226 mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register
227 orreq r10, r10, #1 << 6 @ set bit #6
228 mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register
230 #if defined(CONFIG_ARM_ERRATA_751472) && defined(CONFIG_SMP)
231 ALT_SMP(cmp r6, #0x30) @ present prior to r3p0
233 mrclt p15, 0, r10, c15, c0, 1 @ read diagnostic register
234 orrlt r10, r10, #1 << 11 @ set bit #11
235 mcrlt p15, 0, r10, c15, c0, 1 @ write diagnostic register
240 mcr p15, 0, r10, c7, c5, 0 @ I+BTB cache invalidate
243 mcr p15, 0, r10, c8, c7, 0 @ invalidate I + D TLBs
244 v7_ttb_setup r10, r4, r8, r5 @ TTBCR, TTBRx setup
247 mcr p15, 0, r5, c10, c2, 0 @ write PRRR
248 mcr p15, 0, r6, c10, c2, 1 @ write NMRR
251 #ifdef CONFIG_USER_PMON
253 mcr p15, 0, r0, c9, c14, 0
256 #ifndef CONFIG_ARM_THUMBEE
257 mrc p15, 0, r0, c0, c1, 0 @ read ID_PFR0 for ThumbEE
258 and r0, r0, #(0xf << 12) @ ThumbEE enabled field
259 teq r0, #(1 << 12) @ check if ThumbEE is present
262 mcr p14, 6, r5, c1, c0, 0 @ Initialize TEEHBR to 0
263 mrc p14, 6, r0, c0, c0, 0 @ load TEECR
264 orr r0, r0, #1 @ set the 1st bit in order to
265 mcr p14, 6, r0, c0, c0, 0 @ stop userspace TEEHBR access
270 #ifdef CONFIG_CPU_ENDIAN_BE8
271 orr r6, r6, #1 << 25 @ big-endian page tables
273 #ifdef CONFIG_SWP_EMULATE
274 orr r5, r5, #(1 << 10) @ set SW bit in "clear"
275 bic r6, r6, #(1 << 10) @ clear it in "mmuset"
277 mrc p15, 0, r0, c1, c0, 0 @ read control register
278 bic r0, r0, r5 @ clear bits them
279 orr r0, r0, r6 @ set them
280 THUMB( orr r0, r0, #1 << 30 ) @ Thumb exceptions
281 mov pc, lr @ return to head.S:__ret
286 .space 4 * 11 @ 11 registers
290 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
291 define_processor_functions v7, dabort=v7_early_abort, pabort=v7_pabort, suspend=1
295 string cpu_arch_name, "armv7"
296 string cpu_elf_name, "v7"
299 .section ".proc.info.init", #alloc, #execinstr
302 * Standard v7 proc info content
304 .macro __v7_proc initfunc, mm_mmuflags = 0, io_mmuflags = 0, hwcaps = 0
305 ALT_SMP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_AP_READ | \
306 PMD_FLAGS_SMP | \mm_mmuflags)
307 ALT_UP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_AP_READ | \
308 PMD_FLAGS_UP | \mm_mmuflags)
309 .long PMD_TYPE_SECT | PMD_SECT_XN | PMD_SECT_AP_WRITE | \
310 PMD_SECT_AP_READ | \io_mmuflags
314 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_FAST_MULT | \
315 HWCAP_EDSP | HWCAP_TLS | \hwcaps
317 .long v7_processor_functions
324 * ARM Ltd. Cortex A5 processor.
326 .type __v7_ca5mp_proc_info, #object
327 __v7_ca5mp_proc_info:
330 __v7_proc __v7_ca5mp_setup
331 .size __v7_ca5mp_proc_info, . - __v7_ca5mp_proc_info
334 * ARM Ltd. Cortex A9 processor.
336 .type __v7_ca9mp_proc_info, #object
337 __v7_ca9mp_proc_info:
340 __v7_proc __v7_ca9mp_setup
341 .size __v7_ca9mp_proc_info, . - __v7_ca9mp_proc_info
344 * ARM Ltd. Cortex A15 processor.
346 .type __v7_ca15mp_proc_info, #object
347 __v7_ca15mp_proc_info:
350 __v7_proc __v7_ca15mp_setup, hwcaps = HWCAP_IDIV
351 .size __v7_ca15mp_proc_info, . - __v7_ca15mp_proc_info
354 * Match any ARMv7 processor core.
356 .type __v7_proc_info, #object
358 .long 0x000f0000 @ Required ID value
359 .long 0x000f0000 @ Mask for ID
361 .size __v7_proc_info, . - __v7_proc_info