xref: /openbmc/linux/arch/arm/mm/proc-sa1100.S (revision 8730046c) 
1/*
2 *  linux/arch/arm/mm/proc-sa1100.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-1100 and StrongARM-1110.
15 *
16 *  Note that SA1100 and SA1110 share everything but their name and CPU ID.
17 *
18 *  12-jun-2000, Erik Mouw (J.A.K.Mouw@its.tudelft.nl):
19 *    Flush the read buffer at context switches
20 */
21#include <linux/linkage.h>
22#include <linux/init.h>
23#include <asm/assembler.h>
24#include <asm/asm-offsets.h>
25#include <asm/hwcap.h>
26#include <mach/hardware.h>
27#include <asm/pgtable-hwdef.h>
28#include <asm/pgtable.h>
29
30#include "proc-macros.S"
31
32/*
33 * the cache line size of the I and D cache
34 */
35#define DCACHELINESIZE	32
36
37	.section .text
38
39/*
40 * cpu_sa1100_proc_init()
41 */
42ENTRY(cpu_sa1100_proc_init)
43	mov	r0, #0
44	mcr	p15, 0, r0, c15, c1, 2		@ Enable clock switching
45	mcr	p15, 0, r0, c9, c0, 5		@ Allow read-buffer operations from userland
46	ret	lr
47
48/*
49 * cpu_sa1100_proc_fin()
50 *
51 * Prepare the CPU for reset:
52 *  - Disable interrupts
53 *  - Clean and turn off caches.
54 */
55ENTRY(cpu_sa1100_proc_fin)
56	mcr	p15, 0, ip, c15, c2, 2		@ Disable clock switching
57	mrc	p15, 0, r0, c1, c0, 0		@ ctrl register
58	bic	r0, r0, #0x1000			@ ...i............
59	bic	r0, r0, #0x000e			@ ............wca.
60	mcr	p15, 0, r0, c1, c0, 0		@ disable caches
61	ret	lr
62
63/*
64 * cpu_sa1100_reset(loc)
65 *
66 * Perform a soft reset of the system.  Put the CPU into the
67 * same state as it would be if it had been reset, and branch
68 * to what would be the reset vector.
69 *
70 * loc: location to jump to for soft reset
71 */
72	.align	5
73	.pushsection	.idmap.text, "ax"
74ENTRY(cpu_sa1100_reset)
75	mov	ip, #0
76	mcr	p15, 0, ip, c7, c7, 0		@ invalidate I,D caches
77	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
78#ifdef CONFIG_MMU
79	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
80#endif
81	mrc	p15, 0, ip, c1, c0, 0		@ ctrl register
82	bic	ip, ip, #0x000f			@ ............wcam
83	bic	ip, ip, #0x1100			@ ...i...s........
84	mcr	p15, 0, ip, c1, c0, 0		@ ctrl register
85	ret	r0
86ENDPROC(cpu_sa1100_reset)
87	.popsection
88
89/*
90 * cpu_sa1100_do_idle(type)
91 *
92 * Cause the processor to idle
93 *
94 * type: call type:
95 *   0 = slow idle
96 *   1 = fast idle
97 *   2 = switch to slow processor clock
98 *   3 = switch to fast processor clock
99 */
100	.align	5
101ENTRY(cpu_sa1100_do_idle)
102	mov	r0, r0				@ 4 nop padding
103	mov	r0, r0
104	mov	r0, r0
105	mov	r0, r0				@ 4 nop padding
106	mov	r0, r0
107	mov	r0, r0
108	mov	r0, #0
109	ldr	r1, =UNCACHEABLE_ADDR		@ ptr to uncacheable address
110	@ --- aligned to a cache line
111	mcr	p15, 0, r0, c15, c2, 2		@ disable clock switching
112	ldr	r1, [r1, #0]			@ force switch to MCLK
113	mcr	p15, 0, r0, c15, c8, 2		@ wait for interrupt
114	mov	r0, r0				@ safety
115	mcr	p15, 0, r0, c15, c1, 2		@ enable clock switching
116	ret	lr
117
118/* ================================= CACHE ================================ */
119
120/*
121 * cpu_sa1100_dcache_clean_area(addr,sz)
122 *
123 * Clean the specified entry of any caches such that the MMU
124 * translation fetches will obtain correct data.
125 *
126 * addr: cache-unaligned virtual address
127 */
128	.align	5
129ENTRY(cpu_sa1100_dcache_clean_area)
1301:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
131	add	r0, r0, #DCACHELINESIZE
132	subs	r1, r1, #DCACHELINESIZE
133	bhi	1b
134	ret	lr
135
136/* =============================== PageTable ============================== */
137
138/*
139 * cpu_sa1100_switch_mm(pgd)
140 *
141 * Set the translation base pointer to be as described by pgd.
142 *
143 * pgd: new page tables
144 */
145	.align	5
146ENTRY(cpu_sa1100_switch_mm)
147#ifdef CONFIG_MMU
148	str	lr, [sp, #-4]!
149	bl	v4wb_flush_kern_cache_all	@ clears IP
150	mcr	p15, 0, ip, c9, c0, 0		@ invalidate RB
151	mcr	p15, 0, r0, c2, c0, 0		@ load page table pointer
152	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
153	ldr	pc, [sp], #4
154#else
155	ret	lr
156#endif
157
158/*
159 * cpu_sa1100_set_pte_ext(ptep, pte, ext)
160 *
161 * Set a PTE and flush it out
162 */
163	.align	5
164ENTRY(cpu_sa1100_set_pte_ext)
165#ifdef CONFIG_MMU
166	armv3_set_pte_ext wc_disable=0
167	mov	r0, r0
168	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
169	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
170#endif
171	ret	lr
172
173.globl	cpu_sa1100_suspend_size
174.equ	cpu_sa1100_suspend_size, 4 * 3
175#ifdef CONFIG_ARM_CPU_SUSPEND
176ENTRY(cpu_sa1100_do_suspend)
177	stmfd	sp!, {r4 - r6, lr}
178	mrc	p15, 0, r4, c3, c0, 0		@ domain ID
179	mrc	p15, 0, r5, c13, c0, 0		@ PID
180	mrc	p15, 0, r6, c1, c0, 0		@ control reg
181	stmia	r0, {r4 - r6}			@ store cp regs
182	ldmfd	sp!, {r4 - r6, pc}
183ENDPROC(cpu_sa1100_do_suspend)
184
185ENTRY(cpu_sa1100_do_resume)
186	ldmia	r0, {r4 - r6}			@ load cp regs
187	mov	ip, #0
188	mcr	p15, 0, ip, c8, c7, 0		@ flush I+D TLBs
189	mcr	p15, 0, ip, c7, c7, 0		@ flush I&D cache
190	mcr	p15, 0, ip, c9, c0, 0		@ invalidate RB
191	mcr	p15, 0, ip, c9, c0, 5		@ allow user space to use RB
192
193	mcr	p15, 0, r4, c3, c0, 0		@ domain ID
194	mcr	p15, 0, r1, c2, c0, 0		@ translation table base addr
195	mcr	p15, 0, r5, c13, c0, 0		@ PID
196	mov	r0, r6				@ control register
197	b	cpu_resume_mmu
198ENDPROC(cpu_sa1100_do_resume)
199#endif
200
201	.type	__sa1100_setup, #function
202__sa1100_setup:
203	mov	r0, #0
204	mcr	p15, 0, r0, c7, c7		@ invalidate I,D caches on v4
205	mcr	p15, 0, r0, c7, c10, 4		@ drain write buffer on v4
206#ifdef CONFIG_MMU
207	mcr	p15, 0, r0, c8, c7		@ invalidate I,D TLBs on v4
208#endif
209	adr	r5, sa1100_crval
210	ldmia	r5, {r5, r6}
211	mrc	p15, 0, r0, c1, c0		@ get control register v4
212	bic	r0, r0, r5
213	orr	r0, r0, r6
214	ret	lr
215	.size	__sa1100_setup, . - __sa1100_setup
216
217	/*
218	 *  R
219	 * .RVI ZFRS BLDP WCAM
220	 * ..11 0001 ..11 1101
221	 *
222	 */
223	.type	sa1100_crval, #object
224sa1100_crval:
225	crval	clear=0x00003f3f, mmuset=0x0000313d, ucset=0x00001130
226
227	__INITDATA
228
229/*
230 * SA1100 and SA1110 share the same function calls
231 */
232
233	@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
234	define_processor_functions sa1100, dabort=v4_early_abort, pabort=legacy_pabort, suspend=1
235
236	.section ".rodata"
237
238	string	cpu_arch_name, "armv4"
239	string	cpu_elf_name, "v4"
240	string	cpu_sa1100_name, "StrongARM-1100"
241	string	cpu_sa1110_name, "StrongARM-1110"
242
243	.align
244
245	.section ".proc.info.init", #alloc
246
247.macro sa1100_proc_info name:req, cpu_val:req, cpu_mask:req, cpu_name:req
248	.type	__\name\()_proc_info,#object
249__\name\()_proc_info:
250	.long	\cpu_val
251	.long	\cpu_mask
252	.long   PMD_TYPE_SECT | \
253		PMD_SECT_BUFFERABLE | \
254		PMD_SECT_CACHEABLE | \
255		PMD_SECT_AP_WRITE | \
256		PMD_SECT_AP_READ
257	.long   PMD_TYPE_SECT | \
258		PMD_SECT_AP_WRITE | \
259		PMD_SECT_AP_READ
260	initfn	__sa1100_setup, __\name\()_proc_info
261	.long	cpu_arch_name
262	.long	cpu_elf_name
263	.long	HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
264	.long	\cpu_name
265	.long	sa1100_processor_functions
266	.long	v4wb_tlb_fns
267	.long	v4_mc_user_fns
268	.long	v4wb_cache_fns
269	.size	__\name\()_proc_info, . - __\name\()_proc_info
270.endm
271
272	sa1100_proc_info sa1100, 0x4401a110, 0xfffffff0, cpu_sa1100_name
273	sa1100_proc_info sa1110, 0x6901b110, 0xfffffff0, cpu_sa1110_name
274