xref: /openbmc/linux/arch/arm/mm/proc-sa110.S (revision 52cdded0) 
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 *  linux/arch/arm/mm/proc-sa110.S
4 *
5 *  Copyright (C) 1997-2002 Russell King
6 *  hacked for non-paged-MM by Hyok S. Choi, 2003.
7 *
8 *  MMU functions for SA110
9 *
10 *  These are the low level assembler for performing cache and TLB
11 *  functions on the StrongARM-110.
12 */
13#include <linux/linkage.h>
14#include <linux/init.h>
15#include <linux/pgtable.h>
16#include <asm/assembler.h>
17#include <asm/asm-offsets.h>
18#include <asm/hwcap.h>
19#include <mach/hardware.h>
20#include <asm/pgtable-hwdef.h>
21#include <asm/ptrace.h>
22
23#include "proc-macros.S"
24
25/*
26 * the cache line size of the I and D cache
27 */
28#define DCACHELINESIZE	32
29
30	.text
31
32/*
33 * cpu_sa110_proc_init()
34 */
35ENTRY(cpu_sa110_proc_init)
36	mov	r0, #0
37	mcr	p15, 0, r0, c15, c1, 2		@ Enable clock switching
38	ret	lr
39
40/*
41 * cpu_sa110_proc_fin()
42 */
43ENTRY(cpu_sa110_proc_fin)
44	mov	r0, #0
45	mcr	p15, 0, r0, c15, c2, 2		@ Disable clock switching
46	mrc	p15, 0, r0, c1, c0, 0		@ ctrl register
47	bic	r0, r0, #0x1000			@ ...i............
48	bic	r0, r0, #0x000e			@ ............wca.
49	mcr	p15, 0, r0, c1, c0, 0		@ disable caches
50	ret	lr
51
52/*
53 * cpu_sa110_reset(loc)
54 *
55 * Perform a soft reset of the system.  Put the CPU into the
56 * same state as it would be if it had been reset, and branch
57 * to what would be the reset vector.
58 *
59 * loc: location to jump to for soft reset
60 */
61	.align	5
62	.pushsection	.idmap.text, "ax"
63ENTRY(cpu_sa110_reset)
64	mov	ip, #0
65	mcr	p15, 0, ip, c7, c7, 0		@ invalidate I,D caches
66	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
67#ifdef CONFIG_MMU
68	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
69#endif
70	mrc	p15, 0, ip, c1, c0, 0		@ ctrl register
71	bic	ip, ip, #0x000f			@ ............wcam
72	bic	ip, ip, #0x1100			@ ...i...s........
73	mcr	p15, 0, ip, c1, c0, 0		@ ctrl register
74	ret	r0
75ENDPROC(cpu_sa110_reset)
76	.popsection
77
78/*
79 * cpu_sa110_do_idle(type)
80 *
81 * Cause the processor to idle
82 *
83 * type: call type:
84 *   0 = slow idle
85 *   1 = fast idle
86 *   2 = switch to slow processor clock
87 *   3 = switch to fast processor clock
88 */
89	.align	5
90
91ENTRY(cpu_sa110_do_idle)
92	mcr	p15, 0, ip, c15, c2, 2		@ disable clock switching
93	ldr	r1, =UNCACHEABLE_ADDR		@ load from uncacheable loc
94	ldr	r1, [r1, #0]			@ force switch to MCLK
95	mov	r0, r0				@ safety
96	mov	r0, r0				@ safety
97	mov	r0, r0				@ safety
98	mcr	p15, 0, r0, c15, c8, 2		@ Wait for interrupt, cache aligned
99	mov	r0, r0				@ safety
100	mov	r0, r0				@ safety
101	mov	r0, r0				@ safety
102	mcr	p15, 0, r0, c15, c1, 2		@ enable clock switching
103	ret	lr
104
105/* ================================= CACHE ================================ */
106
107/*
108 * cpu_sa110_dcache_clean_area(addr,sz)
109 *
110 * Clean the specified entry of any caches such that the MMU
111 * translation fetches will obtain correct data.
112 *
113 * addr: cache-unaligned virtual address
114 */
115	.align	5
116ENTRY(cpu_sa110_dcache_clean_area)
1171:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
118	add	r0, r0, #DCACHELINESIZE
119	subs	r1, r1, #DCACHELINESIZE
120	bhi	1b
121	ret	lr
122
123/* =============================== PageTable ============================== */
124
125/*
126 * cpu_sa110_switch_mm(pgd)
127 *
128 * Set the translation base pointer to be as described by pgd.
129 *
130 * pgd: new page tables
131 */
132	.align	5
133ENTRY(cpu_sa110_switch_mm)
134#ifdef CONFIG_MMU
135	str	lr, [sp, #-4]!
136	bl	v4wb_flush_kern_cache_all	@ clears IP
137	mcr	p15, 0, r0, c2, c0, 0		@ load page table pointer
138	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
139	ldr	pc, [sp], #4
140#else
141	ret	lr
142#endif
143
144/*
145 * cpu_sa110_set_pte_ext(ptep, pte, ext)
146 *
147 * Set a PTE and flush it out
148 */
149	.align	5
150ENTRY(cpu_sa110_set_pte_ext)
151#ifdef CONFIG_MMU
152	armv3_set_pte_ext wc_disable=0
153	mov	r0, r0
154	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
155	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
156#endif
157	ret	lr
158
159	.type	__sa110_setup, #function
160__sa110_setup:
161	mov	r10, #0
162	mcr	p15, 0, r10, c7, c7		@ invalidate I,D caches on v4
163	mcr	p15, 0, r10, c7, c10, 4		@ drain write buffer on v4
164#ifdef CONFIG_MMU
165	mcr	p15, 0, r10, c8, c7		@ invalidate I,D TLBs on v4
166#endif
167
168	adr	r5, sa110_crval
169	ldmia	r5, {r5, r6}
170	mrc	p15, 0, r0, c1, c0		@ get control register v4
171	bic	r0, r0, r5
172	orr	r0, r0, r6
173	ret	lr
174	.size	__sa110_setup, . - __sa110_setup
175
176	/*
177	 *  R
178	 * .RVI ZFRS BLDP WCAM
179	 * ..01 0001 ..11 1101
180	 *
181	 */
182	.type	sa110_crval, #object
183sa110_crval:
184	crval	clear=0x00003f3f, mmuset=0x0000113d, ucset=0x00001130
185
186	__INITDATA
187
188	@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
189	define_processor_functions sa110, dabort=v4_early_abort, pabort=legacy_pabort
190
191	.section ".rodata"
192
193	string	cpu_arch_name, "armv4"
194	string	cpu_elf_name, "v4"
195	string	cpu_sa110_name, "StrongARM-110"
196
197	.align
198
199	.section ".proc.info.init", "a"
200
201	.type	__sa110_proc_info,#object
202__sa110_proc_info:
203	.long	0x4401a100
204	.long	0xfffffff0
205	.long   PMD_TYPE_SECT | \
206		PMD_SECT_BUFFERABLE | \
207		PMD_SECT_CACHEABLE | \
208		PMD_SECT_AP_WRITE | \
209		PMD_SECT_AP_READ
210	.long   PMD_TYPE_SECT | \
211		PMD_SECT_AP_WRITE | \
212		PMD_SECT_AP_READ
213	initfn	__sa110_setup, __sa110_proc_info
214	.long	cpu_arch_name
215	.long	cpu_elf_name
216	.long	HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
217	.long	cpu_sa110_name
218	.long	sa110_processor_functions
219	.long	v4wb_tlb_fns
220	.long	v4wb_user_fns
221	.long	v4wb_cache_fns
222	.size	__sa110_proc_info, . - __sa110_proc_info
223