summaryrefslogtreecommitdiffstats
path: root/arch/arm/mm/proc-sa1100.S
blob: bc7cff5b6afa260916988fc3aa3ea546c78f6cf1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 *  linux/arch/arm/mm/proc-sa1100.S
 *
 *  Copyright (C) 1997-2002 Russell King
 *  hacked for non-paged-MM by Hyok S. Choi, 2003.
 *
 *  MMU functions for SA110
 *
 *  These are the low level assembler for performing cache and TLB
 *  functions on the StrongARM-1100 and StrongARM-1110.
 *
 *  Note that SA1100 and SA1110 share everything but their name and CPU ID.
 *
 *  12-jun-2000, Erik Mouw (J.A.K.Mouw@its.tudelft.nl):
 *    Flush the read buffer at context switches
 */
#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/assembler.h>
#include <asm/asm-offsets.h>
#include <asm/hwcap.h>
#include <mach/hardware.h>
#include <asm/pgtable-hwdef.h>
#include <linux/pgtable.h>

#include "proc-macros.S"

/*
 * the cache line size of the I and D cache
 */
#define DCACHELINESIZE	32

	.section .text

/*
 * cpu_sa1100_proc_init()
 */
ENTRY(cpu_sa1100_proc_init)
	mov	r0, #0
	mcr	p15, 0, r0, c15, c1, 2		@ Enable clock switching
	mcr	p15, 0, r0, c9, c0, 5		@ Allow read-buffer operations from userland
	ret	lr

/*
 * cpu_sa1100_proc_fin()
 *
 * Prepare the CPU for reset:
 *  - Disable interrupts
 *  - Clean and turn off caches.
 */
ENTRY(cpu_sa1100_proc_fin)
	mcr	p15, 0, ip, c15, c2, 2		@ Disable clock switching
	mrc	p15, 0, r0, c1, c0, 0		@ ctrl register
	bic	r0, r0, #0x1000			@ ...i............
	bic	r0, r0, #0x000e			@ ............wca.
	mcr	p15, 0, r0, c1, c0, 0		@ disable caches
	ret	lr

/*
 * cpu_sa1100_reset(loc)
 *
 * Perform a soft reset of the system.  Put the CPU into the
 * same state as it would be if it had been reset, and branch
 * to what would be the reset vector.
 *
 * loc: location to jump to for soft reset
 */
	.align	5
	.pushsection	.idmap.text, "ax"
ENTRY(cpu_sa1100_reset)
	mov	ip, #0
	mcr	p15, 0, ip, c7, c7, 0		@ invalidate I,D caches
	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
#ifdef CONFIG_MMU
	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
#endif
	mrc	p15, 0, ip, c1, c0, 0		@ ctrl register
	bic	ip, ip, #0x000f			@ ............wcam
	bic	ip, ip, #0x1100			@ ...i...s........
	mcr	p15, 0, ip, c1, c0, 0		@ ctrl register
	ret	r0
ENDPROC(cpu_sa1100_reset)
	.popsection

/*
 * cpu_sa1100_do_idle(type)
 *
 * Cause the processor to idle
 *
 * type: call type:
 *   0 = slow idle
 *   1 = fast idle
 *   2 = switch to slow processor clock
 *   3 = switch to fast processor clock
 */
	.align	5
ENTRY(cpu_sa1100_do_idle)
	mov	r0, r0				@ 4 nop padding
	mov	r0, r0
	mov	r0, r0
	mov	r0, r0				@ 4 nop padding
	mov	r0, r0
	mov	r0, r0
	mov	r0, #0
	ldr	r1, =UNCACHEABLE_ADDR		@ ptr to uncacheable address
	@ --- aligned to a cache line
	mcr	p15, 0, r0, c15, c2, 2		@ disable clock switching
	ldr	r1, [r1, #0]			@ force switch to MCLK
	mcr	p15, 0, r0, c15, c8, 2		@ wait for interrupt
	mov	r0, r0				@ safety
	mcr	p15, 0, r0, c15, c1, 2		@ enable clock switching
	ret	lr

/* ================================= CACHE ================================ */

/*
 * cpu_sa1100_dcache_clean_area(addr,sz)
 *
 * Clean the specified entry of any caches such that the MMU
 * translation fetches will obtain correct data.
 *
 * addr: cache-unaligned virtual address
 */
	.align	5
ENTRY(cpu_sa1100_dcache_clean_area)
1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
	add	r0, r0, #DCACHELINESIZE
	subs	r1, r1, #DCACHELINESIZE
	bhi	1b
	ret	lr

/* =============================== PageTable ============================== */

/*
 * cpu_sa1100_switch_mm(pgd)
 *
 * Set the translation base pointer to be as described by pgd.
 *
 * pgd: new page tables
 */
	.align	5
ENTRY(cpu_sa1100_switch_mm)
#ifdef CONFIG_MMU
	str	lr, [sp, #-4]!
	bl	v4wb_flush_kern_cache_all	@ clears IP
	mcr	p15, 0, ip, c9, c0, 0		@ invalidate RB
	mcr	p15, 0, r0, c2, c0, 0		@ load page table pointer
	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
	ldr	pc, [sp], #4
#else
	ret	lr
#endif

/*
 * cpu_sa1100_set_pte_ext(ptep, pte, ext)
 *
 * Set a PTE and flush it out
 */
	.align	5
ENTRY(cpu_sa1100_set_pte_ext)
#ifdef CONFIG_MMU
	armv3_set_pte_ext wc_disable=0
	mov	r0, r0
	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
#endif
	ret	lr

.globl	cpu_sa1100_suspend_size
.equ	cpu_sa1100_suspend_size, 4 * 3
#ifdef CONFIG_ARM_CPU_SUSPEND
ENTRY(cpu_sa1100_do_suspend)
	stmfd	sp!, {r4 - r6, lr}
	mrc	p15, 0, r4, c3, c0, 0		@ domain ID
	mrc	p15, 0, r5, c13, c0, 0		@ PID
	mrc	p15, 0, r6, c1, c0, 0		@ control reg
	stmia	r0, {r4 - r6}			@ store cp regs
	ldmfd	sp!, {r4 - r6, pc}
ENDPROC(cpu_sa1100_do_suspend)

ENTRY(cpu_sa1100_do_resume)
	ldmia	r0, {r4 - r6}			@ load cp regs
	mov	ip, #0
	mcr	p15, 0, ip, c8, c7, 0		@ flush I+D TLBs
	mcr	p15, 0, ip, c7, c7, 0		@ flush I&D cache
	mcr	p15, 0, ip, c9, c0, 0		@ invalidate RB
	mcr	p15, 0, ip, c9, c0, 5		@ allow user space to use RB

	mcr	p15, 0, r4, c3, c0, 0		@ domain ID
	mcr	p15, 0, r1, c2, c0, 0		@ translation table base addr
	mcr	p15, 0, r5, c13, c0, 0		@ PID
	mov	r0, r6				@ control register
	b	cpu_resume_mmu
ENDPROC(cpu_sa1100_do_resume)
#endif

	.type	__sa1100_setup, #function
__sa1100_setup:
	mov	r0, #0
	mcr	p15, 0, r0, c7, c7		@ invalidate I,D caches on v4
	mcr	p15, 0, r0, c7, c10, 4		@ drain write buffer on v4
#ifdef CONFIG_MMU
	mcr	p15, 0, r0, c8, c7		@ invalidate I,D TLBs on v4
#endif
	adr	r5, sa1100_crval
	ldmia	r5, {r5, r6}
	mrc	p15, 0, r0, c1, c0		@ get control register v4
	bic	r0, r0, r5
	orr	r0, r0, r6
	ret	lr
	.size	__sa1100_setup, . - __sa1100_setup

	/*
	 *  R
	 * .RVI ZFRS BLDP WCAM
	 * ..11 0001 ..11 1101
	 * 
	 */
	.type	sa1100_crval, #object
sa1100_crval:
	crval	clear=0x00003f3f, mmuset=0x0000313d, ucset=0x00001130

	__INITDATA

/*
 * SA1100 and SA1110 share the same function calls
 */

	@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
	define_processor_functions sa1100, dabort=v4_early_abort, pabort=legacy_pabort, suspend=1

	.section ".rodata"

	string	cpu_arch_name, "armv4"
	string	cpu_elf_name, "v4"
	string	cpu_sa1100_name, "StrongARM-1100"
	string	cpu_sa1110_name, "StrongARM-1110"

	.align

	.section ".proc.info.init", "a"

.macro sa1100_proc_info name:req, cpu_val:req, cpu_mask:req, cpu_name:req
	.type	__\name\()_proc_info,#object
__\name\()_proc_info:
	.long	\cpu_val
	.long	\cpu_mask
	.long   PMD_TYPE_SECT | \
		PMD_SECT_BUFFERABLE | \
		PMD_SECT_CACHEABLE | \
		PMD_SECT_AP_WRITE | \
		PMD_SECT_AP_READ
	.long   PMD_TYPE_SECT | \
		PMD_SECT_AP_WRITE | \
		PMD_SECT_AP_READ
	initfn	__sa1100_setup, __\name\()_proc_info
	.long	cpu_arch_name
	.long	cpu_elf_name
	.long	HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
	.long	\cpu_name
	.long	sa1100_processor_functions
	.long	v4wb_tlb_fns
	.long	v4_mc_user_fns
	.long	v4wb_cache_fns
	.size	__\name\()_proc_info, . - __\name\()_proc_info
.endm

	sa1100_proc_info sa1100, 0x4401a110, 0xfffffff0, cpu_sa1100_name
	sa1100_proc_info sa1110, 0x6901b110, 0xfffffff0, cpu_sa1110_name