source: SVN/rincon/u-boot/board/lpd7a40x/lowlevel_init.S @ 55

Last change on this file since 55 was 55, checked in by Tim Harvey, 22 months ago

rincon: added latest u-boot source

restored form server backup

Signed-off-by: Tim Harvey <tharvey@…>
File size: 5.7 KB
Line 
1/*
2 * Memory Setup - initialize memory controller(s) for devices required
3 *                to boot and relocate
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24
25#include <config.h>
26#include <version.h>
27
28
29/* memory controller */
30#define BCRX_DEFAULT    (0x0000fbe0)
31#define BCRX_MW_8       (0x00000000)
32#define BCRX_MW_16      (0x10000000)
33#define BCRX_MW_32      (0x20000000)
34#define BCRX_PME        (0x08000000)
35#define BCRX_WP         (0x04000000)
36#define BCRX_WST2_SHIFT (11)
37#define BCRX_WST1_SHIFT (5)
38#define BCRX_IDCY_SHIFT (0)
39
40/* Bank0 Async Flash */
41#define BCR0            (0x80002000)
42#define BCR0_FLASH      (BCRX_MW_32 | (0x08<<BCRX_WST2_SHIFT) | (0x0E<<BCRX_WST1_SHIFT))
43
44/* Bank1 Open */
45#define BCR1    (0x80002004)
46
47/* Bank2 Not used (EEPROM?) */
48#define BCR2    (0x80002008)
49
50/* Bank3 Not used */
51#define BCR3    (0x8000200C)
52
53/* Bank4 PC Card1 */
54
55/* Bank5 PC Card2 */
56
57/* Bank6 CPLD IO Controller Peripherals (slow) */
58#define BCR6            (0x80002018)
59#define BCR6_CPLD_SLOW  (BCRX_DEFAULT | BCRX_MW_16)
60
61/* Bank7 CPLD IO Controller Peripherals (fast) */
62#define BCR7            (0x8000201C)
63#define BCR7_CPLD_FAST  (BCRX_MW_16 | (0x16<<BCRX_WST2_SHIFT) | (0x16<<BCRX_WST1_SHIFT) | (0x2<<BCRX_IDCY_SHIFT))
64
65/* SDRAM */
66#define GBLCNFG         (0x80002404)
67#define GC_CKE          (0x80000000)
68#define GC_CKSD         (0x40000000)
69#define GC_LCR          (0x00000040)
70#define GC_SMEMBURST    (0x00000020)
71#define GC_MRS          (0x00000002)
72#define GC_INIT         (0x00000001)
73
74#define GC_CMD_NORMAL           (GC_CKE)
75#define GC_CMD_MODE             (GC_CKE | GC_MRS)
76#define GC_CMD_SYNCFLASH_LOAD   (GC_CKE | GC_MRS | GC_LCR)
77#define GC_CMD_PRECHARGEALL     (GC_CKE | GC_INIT)
78#define GC_CMD_NOP              (GC_CKE | GC_INIT | GC_MRS)
79
80#define RFSHTMR         (0x80002408)
81#define RFSHTMR_INIT    (10)    /* period=100 ns, HCLK=100Mhz, (2048+1-15.6*66) */
82#define RFSHTMR_NORMAL  (1500)  /* period=15.6 us, HCLK=100Mhz, (2048+1-15.6*66) */
83
84#define SDCSCX_BASE             (0x80002410)
85#define SDCSCX_DEFAULT          (0x01220008)
86#define SDCSCX_AUTOPC           (0x01000000)
87#define SDCSCX_RAS2CAS_2        (0x00200000)
88#define SDCSCX_RAS2CAS_3        (0x00300000)
89#define SDCSCX_WBL              (0x00080000)
90#define SDCSCX_CASLAT_8         (0x00070000)
91#define SDCSCX_CASLAT_7         (0x00060000)
92#define SDCSCX_CASLAT_6         (0x00050000)
93#define SDCSCX_CASLAT_5         (0x00040000)
94#define SDCSCX_CASLAT_4         (0x00030000)
95#define SDCSCX_CASLAT_3         (0x00020000)
96#define SDCSCX_CASLAT_2         (0x00010000)
97#define SDCSCX_2KPAGE           (0x00000040)
98#define SDCSCX_SROMLL           (0x00000020)
99#define SDCSCX_SROM512          (0x00000010)
100#define SDCSCX_4BNK             (0x00000008)
101#define SDCSCX_2BNK             (0x00000000)
102#define SDCSCX_EBW_16           (0x00000004)
103#define SDCSCX_EBW_32           (0x00000000)
104
105#define SDRAM_BASE              (0xC0000000)
106#define SDCSC_BANK_OFFSET       (0x10000000)
107
108/*
109 * The SDRAM DEVICE MODE PROGRAMMING VALUE
110 */
111#define BURST_LENGTH_4          (2 << 10)
112#define BURST_LENGTH_8          (3 << 10)
113#define WBURST_LENGTH_BL        (0 << 19)
114#define WBURST_LENGTH_SINGLE    (1 << 19)
115#define CAS_2                   (2 << 14)
116#define CAS_3                   (3 << 14)
117#define BAT_SEQUENTIAL          (0 << 13)
118#define BAT_INTERLEAVED         (1 << 13)
119#define OPM_NORMAL              (0 << 17)
120#define SDRAM_DEVICE_MODE       (WBURST_LENGTH_BL|OPM_NORMAL|CAS_3|BAT_SEQUENTIAL|BURST_LENGTH_4)
121
122
123#define TIMER1_BASE     (0x80000C00)
124
125/*
126 * special lookup flags
127 */
128#define DO_MEM_DELAY    1
129#define DO_MEM_READ     2
130
131_TEXT_BASE:
132        .word   TEXT_BASE
133
134.globl lowlevel_init
135lowlevel_init:
136        mov     r9, lr  @ save return address
137
138        /* memory control configuration */
139        /* make r0 relative the current location so that it */
140        /* reads INITMEM_DATA out of FLASH rather than memory ! */
141        /*   r0 = current word pointer */
142        /*   r1 = end word location, one word past last actual word */
143        /*   r3 = address for writes, special lookup flags */
144        /*   r4 = value for writes, delay constants, or read addresses */
145        /*   r2 = location for mem reads */
146
147        ldr     r0, =INITMEM_DATA
148        ldr     r1, _TEXT_BASE
149        sub     r0, r0, r1
150        add     r1, r0, #112
151
152mem_loop:
153        cmp     r1, r0
154        moveq   pc, r9          @ Done
155
156        ldr     r3, [r0], #4    @ Fetch Destination Register Address, or 1 for delay
157        ldr     r4, [r0], #4    @ value
158
159        cmp     r3, #DO_MEM_DELAY
160        bleq    mem_delay
161        beq     mem_loop
162        cmp     r3, #DO_MEM_READ
163        ldreq   r2, [r4]
164        beq     mem_loop
165        str     r4, [r3]        @ normal register/ram store
166        b       mem_loop
167
168mem_delay:
169        ldr     r5, =TIMER1_BASE
170        mov     r6, r4, LSR #1  @ timer resolution is ~2us
171        str     r6, [r5]
172        mov     r6, #0x88       @ using 508.469KHz clock, enable
173        str     r6, [r5, #8]
1740:      ldr     r6, [r5, #4]    @ timer value
175        cmp     r6, #0
176        bne     0b
177        mov     r6, #0          @ disable timer
178        str     r6, [r5, #8]
179        mov     pc, lr
180
181        .ltorg
182/* the literal pools origin */
183
184INITMEM_DATA:
185        .word   BCR0
186        .word   BCR0_FLASH
187        .word   BCR6
188        .word   BCR6_CPLD_SLOW
189        .word   BCR7
190        .word   BCR7_CPLD_FAST
191        .word   SDCSCX_BASE
192        .word   (SDCSCX_RAS2CAS_3 | SDCSCX_CASLAT_3 | SDCSCX_SROMLL | SDCSCX_4BNK | SDCSCX_EBW_32)
193        .word   GBLCNFG
194        .word   GC_CMD_NOP
195        .word   DO_MEM_DELAY
196        .word   200
197        .word   GBLCNFG
198        .word   GC_CMD_PRECHARGEALL
199        .word   RFSHTMR
200        .word   RFSHTMR_INIT
201        .word   DO_MEM_DELAY
202        .word   8
203        .word   RFSHTMR
204        .word   RFSHTMR_NORMAL
205        .word   GBLCNFG
206        .word   GC_CMD_MODE
207        .word   DO_MEM_READ
208        .word   (SDRAM_BASE | SDRAM_DEVICE_MODE)
209        .word   GBLCNFG
210        .word   GC_CMD_NORMAL
211        .word   SDCSCX_BASE
212        .word   (SDCSCX_AUTOPC | SDCSCX_RAS2CAS_3 | SDCSCX_CASLAT_3 | SDCSCX_SROMLL | SDCSCX_4BNK | SDCSCX_EBW_32)
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