Gitiles
Code Review Sign In
gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 8b1ccd8693abb63537c97b71a3eebefaeefeaf6d / . / board / csb472 / init.S
blob: ca0241bd8a27ed4849e26bcf5099ca6fce33c93e [file] [log] [blame]
wdenkaa245092004-06-09 12:47:02 +0000[diff] [blame]1/******************************************************************************
2 *
3 * This source code has been made available to you by IBM on an AS-IS
4 * basis. Anyone receiving this source is licensed under IBM
5 * copyrights to use it in any way he or she deems fit, including
6 * copying it, modifying it, compiling it, and redistributing it either
7 * with or without modifications. No license under IBM patents or
8 * patent applications is to be implied by the copyright license.
9 *
10 * Any user of this software should understand that IBM cannot provide
11 * technical support for this software and will not be responsible for
12 * any consequences resulting from the use of this software.
13 *
14 * Any person who transfers this source code or any derivative work
15 * must include the IBM copyright notice, this paragraph, and the
16 * preceding two paragraphs in the transferred software.
17 *
18 * COPYRIGHT I B M CORPORATION 1995
19 * LICENSED MATERIAL - PROGRAM PROPERTY OF I B M
20 *
21 *****************************************************************************/
22#include <config.h>
23#include <ppc4xx.h>
24
25#define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
26
27#include <ppc_asm.tmpl>
28#include <ppc_defs.h>
29
30#include <asm/cache.h>
31#include <asm/mmu.h>
32
33#define LI32(reg,val) \
34 addis reg,0,val@h;\
35 ori reg,reg,val@l
36
37#define WDCR_EBC(reg,val) \
38 addi r4,0,reg;\
39 mtdcr ebccfga,r4;\
40 addis r4,0,val@h;\
41 ori r4,r4,val@l;\
42 mtdcr ebccfgd,r4
43
44#define WDCR_SDRAM(reg,val) \
45 addi r4,0,reg;\
46 mtdcr memcfga,r4;\
47 addis r4,0,val@h;\
48 ori r4,r4,val@l;\
49 mtdcr memcfgd,r4
50
51/******************************************************************************
52 * Function: ext_bus_cntlr_init
53 *
54 * Description: Configures EBC Controller and a few basic chip selects.
55 *
56 * CS0 is setup to get the Boot Flash out of the addresss range
57 * so that we may setup a stack. CS7 is setup so that we can
58 * access and reset the hardware watchdog.
59 *
60 * IMPORTANT: For pass1 this code must run from
61 * cache since you can not reliably change a peripheral banks
62 * timing register (pbxap) while running code from that bank.
63 * For ex., since we are running from ROM on bank 0, we can NOT
64 * execute the code that modifies bank 0 timings from ROM, so
65 * we run it from cache.
66 *
67 * Notes: Does NOT use the stack.
68 *****************************************************************************/
69 .section ".text"
70 .align 2
71 .globl ext_bus_cntlr_init
72 .type ext_bus_cntlr_init, @function
73ext_bus_cntlr_init:
74 mflr r0
75 /********************************************************************
76 * Prefetch entire ext_bus_cntrl_init function into the icache.
77 * This is necessary because we are going to change the same CS we
78 * are executing from. Otherwise a CPU lockup may occur.
79 *******************************************************************/
80 bl ..getAddr
81..getAddr:
82 mflr r3 /* get address of ..getAddr */
83
84 /* Calculate number of cache lines for this function */
85 addi r4, 0, (((.Lfe0 - ..getAddr) / CFG_CACHELINE_SIZE) + 2)
86 mtctr r4
87..ebcloop:
88 icbt r0, r3 /* prefetch cache line for addr in r3*/
89 addi r3, r3, CFG_CACHELINE_SIZE /* move to next cache line */
90 bdnz ..ebcloop /* continue for $CTR cache lines */
91
92 /********************************************************************
93 * Delay to ensure all accesses to ROM are complete before changing
94 * bank 0 timings. 200usec should be enough.
95 * 200,000,000 (cycles/sec) X .000200 (sec) = 0x9C40 cycles.
96 *******************************************************************/
97 addis r3, 0, 0x0
98 ori r3, r3, 0xA000 /* wait 200us from reset */
99 mtctr r3
100..spinlp:
101 bdnz ..spinlp /* spin loop */
102
103 /********************************************************************
104 * SETUP CPC0_CR0
105 *******************************************************************/
106 LI32(r4, 0x00c01030)
107 mtdcr cntrl0, r4
108
109 /********************************************************************
110 * Setup CPC0_CR1: Change PCIINT signal to PerWE
111 *******************************************************************/
112 mfdcr r4, cntrl1
113 ori r4, r4, 0x4000
114 mtdcr cntrl1, r4
115
116 /********************************************************************
117 * Setup External Bus Controller (EBC).
118 *******************************************************************/
119 WDCR_EBC(epcr, 0xd84c0000)
120 /********************************************************************
121 * Memory Bank 0 (Intel 28F640J3 Flash) initialization
122 *******************************************************************/
123 /*WDCR_EBC(pb0ap, 0x03055200)*/
124 /*WDCR_EBC(pb0ap, 0x04055200)*/
125 WDCR_EBC(pb0ap, 0x08055200)
126 WDCR_EBC(pb0cr, 0xff87a000)
127 /********************************************************************
128 * Memory Bank 3 (Xilinx XC95144 CPLD) initialization
129 *******************************************************************/
130 /*WDCR_EBC(pb3ap, 0x07869200)*/
131 WDCR_EBC(pb3ap, 0x04055200)
132 WDCR_EBC(pb3cr, 0xff01c000)
133 /********************************************************************
134 * Memory Bank 1,2,4-7 (Unused) initialization
135 *******************************************************************/
136 WDCR_EBC(pb1ap, 0)
137 WDCR_EBC(pb1cr, 0)
138 WDCR_EBC(pb2ap, 0)
139 WDCR_EBC(pb2cr, 0)
140 WDCR_EBC(pb4ap, 0)
141 WDCR_EBC(pb4cr, 0)
142 WDCR_EBC(pb5ap, 0)
143 WDCR_EBC(pb5cr, 0)
144 WDCR_EBC(pb6ap, 0)
145 WDCR_EBC(pb6cr, 0)
146 WDCR_EBC(pb7ap, 0)
147 WDCR_EBC(pb7cr, 0)
148
149 /* We are all done */
150 mtlr r0 /* Restore link register */
151 blr /* Return to calling function */
152.Lfe0: .size ext_bus_cntlr_init,.Lfe0-ext_bus_cntlr_init
153/* end ext_bus_cntlr_init() */
154
155/******************************************************************************
156 * Function: sdram_init
157 *
158 * Description: Configures SDRAM memory banks.
159 *
160 * Notes: Does NOT use the stack.
161 *****************************************************************************/
162 .section ".text"
163 .align 2
164 .globl sdram_init
165 .type sdram_init, @function
166sdram_init:
167
168 /*
169 * Disable memory controller to allow
170 * values to be changed.
171 */
172 WDCR_SDRAM(mem_mcopt1, 0x00000000)
173
174 /*
175 * Configure Memory Banks
176 */
177 WDCR_SDRAM(mem_mb0cf, 0x00062001)
178 WDCR_SDRAM(mem_mb1cf, 0x00000000)
179 WDCR_SDRAM(mem_mb2cf, 0x00000000)
180 WDCR_SDRAM(mem_mb3cf, 0x00000000)
181
182 /*
183 * Set up SDTR1 (SDRAM Timing Register)
184 */
185 WDCR_SDRAM(mem_sdtr1, 0x00854009)
186
187 /*
188 * Set RTR (Refresh Timing Register)
189 */
190 WDCR_SDRAM(mem_rtr, 0x10000000)
191 /* WDCR_SDRAM(mem_rtr, 0x05f00000) */
192
193 /********************************************************************
194 * Delay to ensure 200usec have elapsed since reset. Assume worst
195 * case that the core is running 200Mhz:
196 * 200,000,000 (cycles/sec) X .000200 (sec) = 0x9C40 cycles
197 *******************************************************************/
198 addis r3, 0, 0x0000
199 ori r3, r3, 0xA000 /* Wait >200us from reset */
200 mtctr r3
201..spinlp2:
202 bdnz ..spinlp2 /* spin loop */
203
204 /********************************************************************
205 * Set memory controller options reg, MCOPT1.
206 *******************************************************************/
207 WDCR_SDRAM(mem_mcopt1,0x80800000)
208
209..sdri_done:
210 blr /* Return to calling function */
211.Lfe1: .size sdram_init,.Lfe1-sdram_init
212/* end sdram_init() */