xref: /openbmc/linux/arch/arm/mm/proc-sa110.S (revision b6dcefde) 
1/*
2 *  linux/arch/arm/mm/proc-sa110.S
3 *
4 *  Copyright (C) 1997-2002 Russell King
5 *  hacked for non-paged-MM by Hyok S. Choi, 2003.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 *  MMU functions for SA110
12 *
13 *  These are the low level assembler for performing cache and TLB
14 *  functions on the StrongARM-110.
15 */
16#include <linux/linkage.h>
17#include <linux/init.h>
18#include <asm/assembler.h>
19#include <asm/asm-offsets.h>
20#include <asm/hwcap.h>
21#include <mach/hardware.h>
22#include <asm/pgtable-hwdef.h>
23#include <asm/pgtable.h>
24#include <asm/ptrace.h>
25
26#include "proc-macros.S"
27
28/*
29 * the cache line size of the I and D cache
30 */
31#define DCACHELINESIZE	32
32
33	.text
34
35/*
36 * cpu_sa110_proc_init()
37 */
38ENTRY(cpu_sa110_proc_init)
39	mov	r0, #0
40	mcr	p15, 0, r0, c15, c1, 2		@ Enable clock switching
41	mov	pc, lr
42
43/*
44 * cpu_sa110_proc_fin()
45 */
46ENTRY(cpu_sa110_proc_fin)
47	stmfd	sp!, {lr}
48	mov	ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
49	msr	cpsr_c, ip
50	bl	v4wb_flush_kern_cache_all	@ clean caches
511:	mov	r0, #0
52	mcr	p15, 0, r0, c15, c2, 2		@ Disable clock switching
53	mrc	p15, 0, r0, c1, c0, 0		@ ctrl register
54	bic	r0, r0, #0x1000			@ ...i............
55	bic	r0, r0, #0x000e			@ ............wca.
56	mcr	p15, 0, r0, c1, c0, 0		@ disable caches
57	ldmfd	sp!, {pc}
58
59/*
60 * cpu_sa110_reset(loc)
61 *
62 * Perform a soft reset of the system.  Put the CPU into the
63 * same state as it would be if it had been reset, and branch
64 * to what would be the reset vector.
65 *
66 * loc: location to jump to for soft reset
67 */
68	.align	5
69ENTRY(cpu_sa110_reset)
70	mov	ip, #0
71	mcr	p15, 0, ip, c7, c7, 0		@ invalidate I,D caches
72	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
73#ifdef CONFIG_MMU
74	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
75#endif
76	mrc	p15, 0, ip, c1, c0, 0		@ ctrl register
77	bic	ip, ip, #0x000f			@ ............wcam
78	bic	ip, ip, #0x1100			@ ...i...s........
79	mcr	p15, 0, ip, c1, c0, 0		@ ctrl register
80	mov	pc, r0
81
82/*
83 * cpu_sa110_do_idle(type)
84 *
85 * Cause the processor to idle
86 *
87 * type: call type:
88 *   0 = slow idle
89 *   1 = fast idle
90 *   2 = switch to slow processor clock
91 *   3 = switch to fast processor clock
92 */
93	.align	5
94
95ENTRY(cpu_sa110_do_idle)
96	mcr	p15, 0, ip, c15, c2, 2		@ disable clock switching
97	ldr	r1, =UNCACHEABLE_ADDR		@ load from uncacheable loc
98	ldr	r1, [r1, #0]			@ force switch to MCLK
99	mov	r0, r0				@ safety
100	mov	r0, r0				@ safety
101	mov	r0, r0				@ safety
102	mcr	p15, 0, r0, c15, c8, 2		@ Wait for interrupt, cache aligned
103	mov	r0, r0				@ safety
104	mov	r0, r0				@ safety
105	mov	r0, r0				@ safety
106	mcr	p15, 0, r0, c15, c1, 2		@ enable clock switching
107	mov	pc, lr
108
109/* ================================= CACHE ================================ */
110
111/*
112 * cpu_sa110_dcache_clean_area(addr,sz)
113 *
114 * Clean the specified entry of any caches such that the MMU
115 * translation fetches will obtain correct data.
116 *
117 * addr: cache-unaligned virtual address
118 */
119	.align	5
120ENTRY(cpu_sa110_dcache_clean_area)
1211:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
122	add	r0, r0, #DCACHELINESIZE
123	subs	r1, r1, #DCACHELINESIZE
124	bhi	1b
125	mov	pc, lr
126
127/* =============================== PageTable ============================== */
128
129/*
130 * cpu_sa110_switch_mm(pgd)
131 *
132 * Set the translation base pointer to be as described by pgd.
133 *
134 * pgd: new page tables
135 */
136	.align	5
137ENTRY(cpu_sa110_switch_mm)
138#ifdef CONFIG_MMU
139	str	lr, [sp, #-4]!
140	bl	v4wb_flush_kern_cache_all	@ clears IP
141	mcr	p15, 0, r0, c2, c0, 0		@ load page table pointer
142	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
143	ldr	pc, [sp], #4
144#else
145	mov	pc, lr
146#endif
147
148/*
149 * cpu_sa110_set_pte_ext(ptep, pte, ext)
150 *
151 * Set a PTE and flush it out
152 */
153	.align	5
154ENTRY(cpu_sa110_set_pte_ext)
155#ifdef CONFIG_MMU
156	armv3_set_pte_ext wc_disable=0
157	mov	r0, r0
158	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
159	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
160#endif
161	mov	pc, lr
162
163	__INIT
164
165	.type	__sa110_setup, #function
166__sa110_setup:
167	mov	r10, #0
168	mcr	p15, 0, r10, c7, c7		@ invalidate I,D caches on v4
169	mcr	p15, 0, r10, c7, c10, 4		@ drain write buffer on v4
170#ifdef CONFIG_MMU
171	mcr	p15, 0, r10, c8, c7		@ invalidate I,D TLBs on v4
172#endif
173
174	adr	r5, sa110_crval
175	ldmia	r5, {r5, r6}
176	mrc	p15, 0, r0, c1, c0		@ get control register v4
177	bic	r0, r0, r5
178	orr	r0, r0, r6
179	mov	pc, lr
180	.size	__sa110_setup, . - __sa110_setup
181
182	/*
183	 *  R
184	 * .RVI ZFRS BLDP WCAM
185	 * ..01 0001 ..11 1101
186	 *
187	 */
188	.type	sa110_crval, #object
189sa110_crval:
190	crval	clear=0x00003f3f, mmuset=0x0000113d, ucset=0x00001130
191
192	__INITDATA
193
194/*
195 * Purpose : Function pointers used to access above functions - all calls
196 *	     come through these
197 */
198
199	.type	sa110_processor_functions, #object
200ENTRY(sa110_processor_functions)
201	.word	v4_early_abort
202	.word	legacy_pabort
203	.word	cpu_sa110_proc_init
204	.word	cpu_sa110_proc_fin
205	.word	cpu_sa110_reset
206	.word	cpu_sa110_do_idle
207	.word	cpu_sa110_dcache_clean_area
208	.word	cpu_sa110_switch_mm
209	.word	cpu_sa110_set_pte_ext
210	.size	sa110_processor_functions, . - sa110_processor_functions
211
212	.section ".rodata"
213
214	.type	cpu_arch_name, #object
215cpu_arch_name:
216	.asciz	"armv4"
217	.size	cpu_arch_name, . - cpu_arch_name
218
219	.type	cpu_elf_name, #object
220cpu_elf_name:
221	.asciz	"v4"
222	.size	cpu_elf_name, . - cpu_elf_name
223
224	.type	cpu_sa110_name, #object
225cpu_sa110_name:
226	.asciz	"StrongARM-110"
227	.size	cpu_sa110_name, . - cpu_sa110_name
228
229	.align
230
231	.section ".proc.info.init", #alloc, #execinstr
232
233	.type	__sa110_proc_info,#object
234__sa110_proc_info:
235	.long	0x4401a100
236	.long	0xfffffff0
237	.long   PMD_TYPE_SECT | \
238		PMD_SECT_BUFFERABLE | \
239		PMD_SECT_CACHEABLE | \
240		PMD_SECT_AP_WRITE | \
241		PMD_SECT_AP_READ
242	.long   PMD_TYPE_SECT | \
243		PMD_SECT_AP_WRITE | \
244		PMD_SECT_AP_READ
245	b	__sa110_setup
246	.long	cpu_arch_name
247	.long	cpu_elf_name
248	.long	HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
249	.long	cpu_sa110_name
250	.long	sa110_processor_functions
251	.long	v4wb_tlb_fns
252	.long	v4wb_user_fns
253	.long	v4wb_cache_fns
254	.size	__sa110_proc_info, . - __sa110_proc_info
255