drm/rockchip: Don't change hdmi reference clock rate
[drm/drm-misc.git] / arch / arm / mm / proc-sa110.S
blob3da76fab8ac3a2f2d83c13283627e4af06f73c50
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/cfi_types.h>
16 #include <linux/pgtable.h>
17 #include <asm/assembler.h>
18 #include <asm/asm-offsets.h>
19 #include <asm/hwcap.h>
20 #include <mach/hardware.h>
21 #include <asm/pgtable-hwdef.h>
22 #include <asm/ptrace.h>
24 #include "proc-macros.S"
27  * the cache line size of the I and D cache
28  */
29 #define DCACHELINESIZE  32
31         .text
34  * cpu_sa110_proc_init()
35  */
36 SYM_TYPED_FUNC_START(cpu_sa110_proc_init)
37         mov     r0, #0
38         mcr     p15, 0, r0, c15, c1, 2          @ Enable clock switching
39         ret     lr
40 SYM_FUNC_END(cpu_sa110_proc_init)
43  * cpu_sa110_proc_fin()
44  */
45 SYM_TYPED_FUNC_START(cpu_sa110_proc_fin)
46         mov     r0, #0
47         mcr     p15, 0, r0, c15, c2, 2          @ Disable clock switching
48         mrc     p15, 0, r0, c1, c0, 0           @ ctrl register
49         bic     r0, r0, #0x1000                 @ ...i............
50         bic     r0, r0, #0x000e                 @ ............wca.
51         mcr     p15, 0, r0, c1, c0, 0           @ disable caches
52         ret     lr
53 SYM_FUNC_END(cpu_sa110_proc_fin)
56  * cpu_sa110_reset(loc)
57  *
58  * Perform a soft reset of the system.  Put the CPU into the
59  * same state as it would be if it had been reset, and branch
60  * to what would be the reset vector.
61  *
62  * loc: location to jump to for soft reset
63  */
64         .align  5
65         .pushsection    .idmap.text, "ax"
66 SYM_TYPED_FUNC_START(cpu_sa110_reset)
67         mov     ip, #0
68         mcr     p15, 0, ip, c7, c7, 0           @ invalidate I,D caches
69         mcr     p15, 0, ip, c7, c10, 4          @ drain WB
70 #ifdef CONFIG_MMU
71         mcr     p15, 0, ip, c8, c7, 0           @ invalidate I & D TLBs
72 #endif
73         mrc     p15, 0, ip, c1, c0, 0           @ ctrl register
74         bic     ip, ip, #0x000f                 @ ............wcam
75         bic     ip, ip, #0x1100                 @ ...i...s........
76         mcr     p15, 0, ip, c1, c0, 0           @ ctrl register
77         ret     r0
78 SYM_FUNC_END(cpu_sa110_reset)
79         .popsection
82  * cpu_sa110_do_idle(type)
83  *
84  * Cause the processor to idle
85  *
86  * type: call type:
87  *   0 = slow idle
88  *   1 = fast idle
89  *   2 = switch to slow processor clock
90  *   3 = switch to fast processor clock
91  */
92         .align  5
94 SYM_TYPED_FUNC_START(cpu_sa110_do_idle)
95         mcr     p15, 0, ip, c15, c2, 2          @ disable clock switching
96         ldr     r1, =UNCACHEABLE_ADDR           @ load from uncacheable loc
97         ldr     r1, [r1, #0]                    @ force switch to MCLK
98         mov     r0, r0                          @ safety
99         mov     r0, r0                          @ safety
100         mov     r0, r0                          @ safety
101         mcr     p15, 0, r0, c15, c8, 2          @ Wait for interrupt, cache aligned
102         mov     r0, r0                          @ safety
103         mov     r0, r0                          @ safety
104         mov     r0, r0                          @ safety
105         mcr     p15, 0, r0, c15, c1, 2          @ enable clock switching
106         ret     lr
107 SYM_FUNC_END(cpu_sa110_do_idle)
109 /* ================================= CACHE ================================ */
112  * cpu_sa110_dcache_clean_area(addr,sz)
114  * Clean the specified entry of any caches such that the MMU
115  * translation fetches will obtain correct data.
117  * addr: cache-unaligned virtual address
118  */
119         .align  5
120 SYM_TYPED_FUNC_START(cpu_sa110_dcache_clean_area)
121 1:      mcr     p15, 0, r0, c7, c10, 1          @ clean D entry
122         add     r0, r0, #DCACHELINESIZE
123         subs    r1, r1, #DCACHELINESIZE
124         bhi     1b
125         ret     lr
126 SYM_FUNC_END(cpu_sa110_dcache_clean_area)
128 /* =============================== PageTable ============================== */
131  * cpu_sa110_switch_mm(pgd)
133  * Set the translation base pointer to be as described by pgd.
135  * pgd: new page tables
136  */
137         .align  5
138 SYM_TYPED_FUNC_START(cpu_sa110_switch_mm)
139 #ifdef CONFIG_MMU
140         str     lr, [sp, #-4]!
141         bl      v4wb_flush_kern_cache_all       @ clears IP
142         mcr     p15, 0, r0, c2, c0, 0           @ load page table pointer
143         mcr     p15, 0, ip, c8, c7, 0           @ invalidate I & D TLBs
144         ldr     pc, [sp], #4
145 #else
146         ret     lr
147 #endif
148 SYM_FUNC_END(cpu_sa110_switch_mm)
151  * cpu_sa110_set_pte_ext(ptep, pte, ext)
153  * Set a PTE and flush it out
154  */
155         .align  5
156 SYM_TYPED_FUNC_START(cpu_sa110_set_pte_ext)
157 #ifdef CONFIG_MMU
158         armv3_set_pte_ext wc_disable=0
159         mov     r0, r0
160         mcr     p15, 0, r0, c7, c10, 1          @ clean D entry
161         mcr     p15, 0, r0, c7, c10, 4          @ drain WB
162 #endif
163         ret     lr
164 SYM_FUNC_END(cpu_sa110_set_pte_ext)
166         .type   __sa110_setup, #function
167 __sa110_setup:
168         mov     r10, #0
169         mcr     p15, 0, r10, c7, c7             @ invalidate I,D caches on v4
170         mcr     p15, 0, r10, c7, c10, 4         @ drain write buffer on v4
171 #ifdef CONFIG_MMU
172         mcr     p15, 0, r10, c8, c7             @ invalidate I,D TLBs on v4
173 #endif
175         adr     r5, sa110_crval
176         ldmia   r5, {r5, r6}
177         mrc     p15, 0, r0, c1, c0              @ get control register v4
178         bic     r0, r0, r5
179         orr     r0, r0, r6
180         ret     lr
181         .size   __sa110_setup, . - __sa110_setup
183         /*
184          *  R
185          * .RVI ZFRS BLDP WCAM
186          * ..01 0001 ..11 1101
187          * 
188          */
189         .type   sa110_crval, #object
190 sa110_crval:
191         crval   clear=0x00003f3f, mmuset=0x0000113d, ucset=0x00001130
193         __INITDATA
195         @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
196         define_processor_functions sa110, dabort=v4_early_abort, pabort=legacy_pabort
198         .section ".rodata"
200         string  cpu_arch_name, "armv4"
201         string  cpu_elf_name, "v4"
202         string  cpu_sa110_name, "StrongARM-110"
204         .align
206         .section ".proc.info.init", "a"
208         .type   __sa110_proc_info,#object
209 __sa110_proc_info:
210         .long   0x4401a100
211         .long   0xfffffff0
212         .long   PMD_TYPE_SECT | \
213                 PMD_SECT_BUFFERABLE | \
214                 PMD_SECT_CACHEABLE | \
215                 PMD_SECT_AP_WRITE | \
216                 PMD_SECT_AP_READ
217         .long   PMD_TYPE_SECT | \
218                 PMD_SECT_AP_WRITE | \
219                 PMD_SECT_AP_READ
220         initfn  __sa110_setup, __sa110_proc_info
221         .long   cpu_arch_name
222         .long   cpu_elf_name
223         .long   HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
224         .long   cpu_sa110_name
225         .long   sa110_processor_functions
226         .long   v4wb_tlb_fns
227         .long   v4wb_user_fns
228         .long   v4wb_cache_fns
229         .size   __sa110_proc_info, . - __sa110_proc_info