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authorHyok S. Choi <hyok.choi@samsung.com>2006-09-26 04:37:50 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-09-27 12:39:17 -0400
commitb731c3118d87f26c8bf3f358ffbbc24450af50a6 (patch)
tree63e280a475d81eb39c16a7fbd4cd12568b4e1f1e /arch/arm/mm
parent07e0da78abdc679714a12e7a60137d950c346681 (diff)
[ARM] nommu: add ARM740T core support
This patch adds ARM740T core support which has a MPU and 4KB or 8KB cache. Signed-off-by: Hyok S. Choi <hyok.choi@samsung.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm')
-rw-r--r--arch/arm/mm/Kconfig19
-rw-r--r--arch/arm/mm/Makefile1
-rw-r--r--arch/arm/mm/proc-arm740.S174
3 files changed, 192 insertions, 2 deletions
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 9f860aa9c908..87f9fece9606 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -75,6 +75,21 @@ config CPU_ARM720T
75 Say Y if you want support for the ARM720T processor. 75 Say Y if you want support for the ARM720T processor.
76 Otherwise, say N. 76 Otherwise, say N.
77 77
78# ARM740T
79config CPU_ARM740T
80 bool "Support ARM740T processor" if ARCH_INTEGRATOR
81 select CPU_32v4T
82 select CPU_ABRT_LV4T
83 select CPU_CACHE_V3 # although the core is v4t
84 select CPU_CP15_MPU
85 help
86 A 32-bit RISC processor with 8KB cache or 4KB variants,
87 write buffer and MPU(Protection Unit) built around
88 an ARM7TDMI core.
89
90 Say Y if you want support for the ARM740T processor.
91 Otherwise, say N.
92
78# ARM920T 93# ARM920T
79config CPU_ARM920T 94config CPU_ARM920T
80 bool "Support ARM920T processor" 95 bool "Support ARM920T processor"
@@ -436,7 +451,7 @@ comment "Processor Features"
436 451
437config ARM_THUMB 452config ARM_THUMB
438 bool "Support Thumb user binaries" 453 bool "Support Thumb user binaries"
439 depends on CPU_ARM720T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || CPU_XSCALE || CPU_XSC3 || CPU_V6 454 depends on CPU_ARM720T || CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || CPU_XSCALE || CPU_XSC3 || CPU_V6
440 default y 455 default y
441 help 456 help
442 Say Y if you want to include kernel support for running user space 457 Say Y if you want to include kernel support for running user space
@@ -473,7 +488,7 @@ config CPU_DCACHE_DISABLE
473 488
474config CPU_DCACHE_WRITETHROUGH 489config CPU_DCACHE_WRITETHROUGH
475 bool "Force write through D-cache" 490 bool "Force write through D-cache"
476 depends on (CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_V6) && !CPU_DCACHE_DISABLE 491 depends on (CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_V6) && !CPU_DCACHE_DISABLE
477 default y if CPU_ARM925T 492 default y if CPU_ARM925T
478 help 493 help
479 Say Y here to use the data cache in writethrough mode. Unless you 494 Say Y here to use the data cache in writethrough mode. Unless you
diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile
index 908f6d437174..d10db822d3b8 100644
--- a/arch/arm/mm/Makefile
+++ b/arch/arm/mm/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_CPU_ARM610) += proc-arm6_7.o
48obj-$(CONFIG_CPU_ARM710) += proc-arm6_7.o 48obj-$(CONFIG_CPU_ARM710) += proc-arm6_7.o
49obj-$(CONFIG_CPU_ARM7TDMI) += proc-arm7tdmi.o 49obj-$(CONFIG_CPU_ARM7TDMI) += proc-arm7tdmi.o
50obj-$(CONFIG_CPU_ARM720T) += proc-arm720.o 50obj-$(CONFIG_CPU_ARM720T) += proc-arm720.o
51obj-$(CONFIG_CPU_ARM740T) += proc-arm740.o
51obj-$(CONFIG_CPU_ARM920T) += proc-arm920.o 52obj-$(CONFIG_CPU_ARM920T) += proc-arm920.o
52obj-$(CONFIG_CPU_ARM922T) += proc-arm922.o 53obj-$(CONFIG_CPU_ARM922T) += proc-arm922.o
53obj-$(CONFIG_CPU_ARM925T) += proc-arm925.o 54obj-$(CONFIG_CPU_ARM925T) += proc-arm925.o
diff --git a/arch/arm/mm/proc-arm740.S b/arch/arm/mm/proc-arm740.S
new file mode 100644
index 000000000000..40713818a87b
--- /dev/null
+++ b/arch/arm/mm/proc-arm740.S
@@ -0,0 +1,174 @@
1/*
2 * linux/arch/arm/mm/arm740.S: utility functions for ARM740
3 *
4 * Copyright (C) 2004-2006 Hyok S. Choi (hyok.choi@samsung.com)
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 */
11#include <linux/linkage.h>
12#include <linux/init.h>
13#include <asm/assembler.h>
14#include <asm/asm-offsets.h>
15#include <asm/pgtable-hwdef.h>
16#include <asm/pgtable.h>
17#include <asm/procinfo.h>
18#include <asm/ptrace.h>
19
20 .text
21/*
22 * cpu_arm740_proc_init()
23 * cpu_arm740_do_idle()
24 * cpu_arm740_dcache_clean_area()
25 * cpu_arm740_switch_mm()
26 *
27 * These are not required.
28 */
29ENTRY(cpu_arm740_proc_init)
30ENTRY(cpu_arm740_do_idle)
31ENTRY(cpu_arm740_dcache_clean_area)
32ENTRY(cpu_arm740_switch_mm)
33 mov pc, lr
34
35/*
36 * cpu_arm740_proc_fin()
37 */
38ENTRY(cpu_arm740_proc_fin)
39 stmfd sp!, {lr}
40 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
41 msr cpsr_c, ip
42 mrc p15, 0, r0, c1, c0, 0
43 bic r0, r0, #0x3f000000 @ bank/f/lock/s
44 bic r0, r0, #0x0000000c @ w-buffer/cache
45 mcr p15, 0, r0, c1, c0, 0 @ disable caches
46 mcr p15, 0, r0, c7, c0, 0 @ invalidate cache
47 ldmfd sp!, {pc}
48
49/*
50 * cpu_arm740_reset(loc)
51 * Params : r0 = address to jump to
52 * Notes : This sets up everything for a reset
53 */
54ENTRY(cpu_arm740_reset)
55 mov ip, #0
56 mcr p15, 0, ip, c7, c0, 0 @ invalidate cache
57 mrc p15, 0, ip, c1, c0, 0 @ get ctrl register
58 bic ip, ip, #0x0000000c @ ............wc..
59 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
60 mov pc, r0
61
62 __INIT
63
64 .type __arm740_setup, #function
65__arm740_setup:
66 mov r0, #0
67 mcr p15, 0, r0, c7, c0, 0 @ invalidate caches
68
69 mcr p15, 0, r0, c6, c3 @ disable area 3~7
70 mcr p15, 0, r0, c6, c4
71 mcr p15, 0, r0, c6, c5
72 mcr p15, 0, r0, c6, c6
73 mcr p15, 0, r0, c6, c7
74
75 mov r0, #0x0000003F @ base = 0, size = 4GB
76 mcr p15, 0, r0, c6, c0 @ set area 0, default
77
78 ldr r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM
79 ldr r1, =(CONFIG_DRAM_SIZE >> 12) @ size of RAM (must be >= 4KB)
80 mov r2, #10 @ 11 is the minimum (4KB)
811: add r2, r2, #1 @ area size *= 2
82 mov r1, r1, lsr #1
83 bne 1b @ count not zero r-shift
84 orr r0, r0, r2, lsl #1 @ the area register value
85 orr r0, r0, #1 @ set enable bit
86 mcr p15, 0, r0, c6, c1 @ set area 1, RAM
87
88 ldr r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH
89 ldr r1, =(CONFIG_FLASH_SIZE >> 12) @ size of FLASH (must be >= 4KB)
90 mov r2, #10 @ 11 is the minimum (4KB)
911: add r2, r2, #1 @ area size *= 2
92 mov r1, r1, lsr #1
93 bne 1b @ count not zero r-shift
94 orr r0, r0, r2, lsl #1 @ the area register value
95 orr r0, r0, #1 @ set enable bit
96 mcr p15, 0, r0, c6, c2 @ set area 2, ROM/FLASH
97
98 mov r0, #0x06
99 mcr p15, 0, r0, c2, c0 @ Region 1&2 cacheable
100#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
101 mov r0, #0x00 @ disable whole write buffer
102#else
103 mov r0, #0x02 @ Region 1 write bufferred
104#endif
105 mcr p15, 0, r0, c3, c0
106
107 mov r0, #0x10000
108 sub r0, r0, #1 @ r0 = 0xffff
109 mcr p15, 0, r0, c5, c0 @ all read/write access
110
111 mrc p15, 0, r0, c1, c0 @ get control register
112 bic r0, r0, #0x3F000000 @ set to standard caching mode
113 @ need some benchmark
114 orr r0, r0, #0x0000000d @ MPU/Cache/WB
115
116 mov pc, lr
117
118 .size __arm740_setup, . - __arm740_setup
119
120 __INITDATA
121
122/*
123 * Purpose : Function pointers used to access above functions - all calls
124 * come through these
125 */
126 .type arm740_processor_functions, #object
127ENTRY(arm740_processor_functions)
128 .word v4t_late_abort
129 .word cpu_arm740_proc_init
130 .word cpu_arm740_proc_fin
131 .word cpu_arm740_reset
132 .word cpu_arm740_do_idle
133 .word cpu_arm740_dcache_clean_area
134 .word cpu_arm740_switch_mm
135 .word 0 @ cpu_*_set_pte
136 .size arm740_processor_functions, . - arm740_processor_functions
137
138 .section ".rodata"
139
140 .type cpu_arch_name, #object
141cpu_arch_name:
142 .asciz "armv4"
143 .size cpu_arch_name, . - cpu_arch_name
144
145 .type cpu_elf_name, #object
146cpu_elf_name:
147 .asciz "v4"
148 .size cpu_elf_name, . - cpu_elf_name
149
150 .type cpu_arm740_name, #object
151cpu_arm740_name:
152 .ascii "ARM740T"
153 .size cpu_arm740_name, . - cpu_arm740_name
154
155 .align
156
157 .section ".proc.info.init", #alloc, #execinstr
158 .type __arm740_proc_info,#object
159__arm740_proc_info:
160 .long 0x41807400
161 .long 0xfffffff0
162 .long 0
163 b __arm740_setup
164 .long cpu_arch_name
165 .long cpu_elf_name
166 .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT
167 .long cpu_arm740_name
168 .long arm740_processor_functions
169 .long 0
170 .long 0
171 .long v3_cache_fns @ cache model
172 .size __arm740_proc_info, . - __arm740_proc_info
173
174