xref: /openbmc/linux/arch/arm/mm/proc-fa526.S (revision bbb774d9) 
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 *  linux/arch/arm/mm/proc-fa526.S: MMU functions for FA526
4 *
5 *  Written by : Luke Lee
6 *  Copyright (C) 2005 Faraday Corp.
7 *  Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
8 *
9 * These are the low level assembler for performing cache and TLB
10 * functions on the fa526.
11 */
12#include <linux/linkage.h>
13#include <linux/init.h>
14#include <linux/pgtable.h>
15#include <asm/assembler.h>
16#include <asm/hwcap.h>
17#include <asm/pgtable-hwdef.h>
18#include <asm/page.h>
19#include <asm/ptrace.h>
20
21#include "proc-macros.S"
22
23#define CACHE_DLINESIZE	16
24
25	.text
26/*
27 * cpu_fa526_proc_init()
28 */
29ENTRY(cpu_fa526_proc_init)
30	ret	lr
31
32/*
33 * cpu_fa526_proc_fin()
34 */
35ENTRY(cpu_fa526_proc_fin)
36	mrc	p15, 0, r0, c1, c0, 0		@ ctrl register
37	bic	r0, r0, #0x1000			@ ...i............
38	bic	r0, r0, #0x000e			@ ............wca.
39	mcr	p15, 0, r0, c1, c0, 0		@ disable caches
40	nop
41	nop
42	ret	lr
43
44/*
45 * cpu_fa526_reset(loc)
46 *
47 * Perform a soft reset of the system.  Put the CPU into the
48 * same state as it would be if it had been reset, and branch
49 * to what would be the reset vector.
50 *
51 * loc: location to jump to for soft reset
52 */
53	.align	4
54	.pushsection	.idmap.text, "ax"
55ENTRY(cpu_fa526_reset)
56/* TODO: Use CP8 if possible... */
57	mov	ip, #0
58	mcr	p15, 0, ip, c7, c7, 0		@ invalidate I,D caches
59	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
60#ifdef CONFIG_MMU
61	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
62#endif
63	mrc	p15, 0, ip, c1, c0, 0		@ ctrl register
64	bic	ip, ip, #0x000f			@ ............wcam
65	bic	ip, ip, #0x1100			@ ...i...s........
66	bic	ip, ip, #0x0800			@ BTB off
67	mcr	p15, 0, ip, c1, c0, 0		@ ctrl register
68	nop
69	nop
70	ret	r0
71ENDPROC(cpu_fa526_reset)
72	.popsection
73
74/*
75 * cpu_fa526_do_idle()
76 */
77	.align	4
78ENTRY(cpu_fa526_do_idle)
79	ret	lr
80
81
82ENTRY(cpu_fa526_dcache_clean_area)
831:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
84	add	r0, r0, #CACHE_DLINESIZE
85	subs	r1, r1, #CACHE_DLINESIZE
86	bhi	1b
87	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
88	ret	lr
89
90/* =============================== PageTable ============================== */
91
92/*
93 * cpu_fa526_switch_mm(pgd)
94 *
95 * Set the translation base pointer to be as described by pgd.
96 *
97 * pgd: new page tables
98 */
99	.align	4
100ENTRY(cpu_fa526_switch_mm)
101#ifdef CONFIG_MMU
102	mov	ip, #0
103#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
104	mcr	p15, 0, ip, c7, c6, 0		@ invalidate D cache
105#else
106	mcr	p15, 0, ip, c7, c14, 0		@ clean and invalidate whole D cache
107#endif
108	mcr	p15, 0, ip, c7, c5, 0		@ invalidate I cache
109	mcr	p15, 0, ip, c7, c5, 6		@ invalidate BTB since mm changed
110	mcr	p15, 0, ip, c7, c10, 4		@ data write barrier
111	mcr	p15, 0, ip, c7, c5, 4		@ prefetch flush
112	mcr	p15, 0, r0, c2, c0, 0		@ load page table pointer
113	mcr	p15, 0, ip, c8, c7, 0		@ invalidate UTLB
114#endif
115	ret	lr
116
117/*
118 * cpu_fa526_set_pte_ext(ptep, pte, ext)
119 *
120 * Set a PTE and flush it out
121 */
122	.align	4
123ENTRY(cpu_fa526_set_pte_ext)
124#ifdef CONFIG_MMU
125	armv3_set_pte_ext
126	mov	r0, r0
127	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
128	mov	r0, #0
129	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
130#endif
131	ret	lr
132
133	.type	__fa526_setup, #function
134__fa526_setup:
135	/* On return of this routine, r0 must carry correct flags for CFG register */
136	mov	r0, #0
137	mcr	p15, 0, r0, c7, c7		@ invalidate I,D caches on v4
138	mcr	p15, 0, r0, c7, c10, 4		@ drain write buffer on v4
139#ifdef CONFIG_MMU
140	mcr	p15, 0, r0, c8, c7		@ invalidate I,D TLBs on v4
141#endif
142	mcr	p15, 0, r0, c7, c5, 5		@ invalidate IScratchpad RAM
143
144	mov	r0, #1
145	mcr	p15, 0, r0, c1, c1, 0		@ turn-on ECR
146
147	mov	r0, #0
148	mcr	p15, 0, r0, c7, c5, 6		@ invalidate BTB All
149	mcr	p15, 0, r0, c7, c10, 4		@ data write barrier
150	mcr	p15, 0, r0, c7, c5, 4		@ prefetch flush
151
152	mov	r0, #0x1f			@ Domains 0, 1 = manager, 2 = client
153	mcr	p15, 0, r0, c3, c0		@ load domain access register
154
155	mrc	p15, 0, r0, c1, c0		@ get control register v4
156	ldr	r5, fa526_cr1_clear
157	bic	r0, r0, r5
158	ldr	r5, fa526_cr1_set
159	orr	r0, r0, r5
160	ret	lr
161	.size	__fa526_setup, . - __fa526_setup
162
163	/*
164	 * .RVI ZFRS BLDP WCAM
165	 * ..11 1001 .111 1101
166	 *
167	 */
168	.type	fa526_cr1_clear, #object
169	.type	fa526_cr1_set, #object
170fa526_cr1_clear:
171	.word	0x3f3f
172fa526_cr1_set:
173	.word	0x397D
174
175	__INITDATA
176
177	@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
178	define_processor_functions fa526, dabort=v4_early_abort, pabort=legacy_pabort
179
180	.section ".rodata"
181
182	string	cpu_arch_name, "armv4"
183	string	cpu_elf_name, "v4"
184	string	cpu_fa526_name, "FA526"
185
186	.align
187
188	.section ".proc.info.init", "a"
189
190	.type	__fa526_proc_info,#object
191__fa526_proc_info:
192	.long	0x66015261
193	.long	0xff01fff1
194	.long   PMD_TYPE_SECT | \
195		PMD_SECT_BUFFERABLE | \
196		PMD_SECT_CACHEABLE | \
197		PMD_BIT4 | \
198		PMD_SECT_AP_WRITE | \
199		PMD_SECT_AP_READ
200	.long   PMD_TYPE_SECT | \
201		PMD_BIT4 | \
202		PMD_SECT_AP_WRITE | \
203		PMD_SECT_AP_READ
204	initfn	__fa526_setup, __fa526_proc_info
205	.long	cpu_arch_name
206	.long	cpu_elf_name
207	.long	HWCAP_SWP | HWCAP_HALF
208	.long	cpu_fa526_name
209	.long	fa526_processor_functions
210	.long	fa_tlb_fns
211	.long	fa_user_fns
212	.long	fa_cache_fns
213	.size	__fa526_proc_info, . - __fa526_proc_info
214