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c609719b | 1 | /****************************************************************************** |
31773496 JB |
2 | * This source code is dual-licensed. You may use it under the terms of the |
3 | * GNU General Public License version 2, or under the license below. | |
c609719b WD |
4 | * |
5 | * This source code has been made available to you by IBM on an AS-IS | |
6 | * basis. Anyone receiving this source is licensed under IBM | |
7 | * copyrights to use it in any way he or she deems fit, including | |
8 | * copying it, modifying it, compiling it, and redistributing it either | |
9 | * with or without modifications. No license under IBM patents or | |
10 | * patent applications is to be implied by the copyright license. | |
11 | * | |
12 | * Any user of this software should understand that IBM cannot provide | |
13 | * technical support for this software and will not be responsible for | |
14 | * any consequences resulting from the use of this software. | |
15 | * | |
16 | * Any person who transfers this source code or any derivative work | |
17 | * must include the IBM copyright notice, this paragraph, and the | |
18 | * preceding two paragraphs in the transferred software. | |
19 | * | |
20 | * COPYRIGHT I B M CORPORATION 1995 | |
21 | * LICENSED MATERIAL - PROGRAM PROPERTY OF I B M | |
22 | * | |
23 | *****************************************************************************/ | |
24 | #include <config.h> | |
b36df561 | 25 | #include <asm/ppc4xx.h> |
c609719b WD |
26 | |
27 | #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */ | |
28 | ||
29 | #include <ppc_asm.tmpl> | |
30 | #include <ppc_defs.h> | |
31 | ||
32 | #include <asm/cache.h> | |
33 | #include <asm/mmu.h> | |
34 | ||
35 | /****************************************************************************** | |
36 | * Function: ext_bus_cntlr_init | |
37 | * | |
38 | * Description: Configures EBC Controller and a few basic chip selects. | |
39 | * | |
40 | * CS0 is setup to get the Boot Flash out of the addresss range | |
41 | * so that we may setup a stack. CS7 is setup so that we can | |
42 | * access and reset the hardware watchdog. | |
43 | * | |
44 | * IMPORTANT: For pass1 this code must run from | |
45 | * cache since you can not reliably change a peripheral banks | |
46 | * timing register (pbxap) while running code from that bank. | |
47 | * For ex., since we are running from ROM on bank 0, we can NOT | |
48 | * execute the code that modifies bank 0 timings from ROM, so | |
49 | * we run it from cache. | |
50 | * | |
51 | * Notes: Does NOT use the stack. | |
52 | *****************************************************************************/ | |
53 | .section ".text" | |
54 | .align 2 | |
55 | .globl ext_bus_cntlr_init | |
56 | .type ext_bus_cntlr_init, @function | |
57 | ext_bus_cntlr_init: | |
58 | mflr r0 | |
59 | /******************************************************************** | |
60 | * Prefetch entire ext_bus_cntrl_init function into the icache. | |
61 | * This is necessary because we are going to change the same CS we | |
62 | * are executing from. Otherwise a CPU lockup may occur. | |
63 | *******************************************************************/ | |
64 | bl ..getAddr | |
65 | ..getAddr: | |
66 | mflr r3 /* get address of ..getAddr */ | |
67 | ||
68 | /* Calculate number of cache lines for this function */ | |
6d0f6bcf | 69 | addi r4, 0, (((.Lfe0 - ..getAddr) / CONFIG_SYS_CACHELINE_SIZE) + 2) |
c609719b WD |
70 | mtctr r4 |
71 | ..ebcloop: | |
72 | icbt r0, r3 /* prefetch cache line for addr in r3*/ | |
6d0f6bcf | 73 | addi r3, r3, CONFIG_SYS_CACHELINE_SIZE /* move to next cache line */ |
c609719b WD |
74 | bdnz ..ebcloop /* continue for $CTR cache lines */ |
75 | ||
76 | /******************************************************************** | |
77 | * Delay to ensure all accesses to ROM are complete before changing | |
78 | * bank 0 timings. 200usec should be enough. | |
79 | * 200,000,000 (cycles/sec) X .000200 (sec) = 0x9C40 cycles. | |
80 | *******************************************************************/ | |
81 | addis r3, 0, 0x0 | |
82 | ori r3, r3, 0xA000 /* wait 200us from reset */ | |
83 | mtctr r3 | |
84 | ..spinlp: | |
85 | bdnz ..spinlp /* spin loop */ | |
86 | ||
87 | /******************************************************************** | |
88 | * Setup External Bus Controller (EBC). | |
89 | *******************************************************************/ | |
d1c3b275 SR |
90 | addi r3, 0, EBC0_CFG |
91 | mtdcr EBC0_CFGADDR, r3 | |
c609719b WD |
92 | addis r4, 0, 0xb040 /* Device base timeout = 1024 cycles */ |
93 | ori r4, r4, 0x0 /* Drive CS with external master */ | |
d1c3b275 | 94 | mtdcr EBC0_CFGDATA, r4 |
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95 | |
96 | /******************************************************************** | |
97 | * Change PCIINT signal to PerWE | |
98 | *******************************************************************/ | |
d1c3b275 | 99 | mfdcr r4, CPC0_CR1 |
c609719b | 100 | ori r4, r4, 0x4000 |
d1c3b275 | 101 | mtdcr CPC0_CR1, r4 |
c609719b WD |
102 | |
103 | /******************************************************************** | |
104 | * Memory Bank 0 (Flash Bank 0) initialization | |
105 | *******************************************************************/ | |
d1c3b275 SR |
106 | addi r3, 0, PB1AP |
107 | mtdcr EBC0_CFGADDR, r3 | |
6d0f6bcf JCPV |
108 | addis r4, 0, CONFIG_SYS_W7O_EBC_PB0AP@h |
109 | ori r4, r4, CONFIG_SYS_W7O_EBC_PB0AP@l | |
d1c3b275 | 110 | mtdcr EBC0_CFGDATA, r4 |
c609719b | 111 | |
d1c3b275 SR |
112 | addi r3, 0, PB0CR |
113 | mtdcr EBC0_CFGADDR, r3 | |
6d0f6bcf JCPV |
114 | addis r4, 0, CONFIG_SYS_W7O_EBC_PB0CR@h |
115 | ori r4, r4, CONFIG_SYS_W7O_EBC_PB0CR@l | |
d1c3b275 | 116 | mtdcr EBC0_CFGDATA, r4 |
c609719b WD |
117 | |
118 | /******************************************************************** | |
119 | * Memory Bank 7 LEDs - NEEDED BECAUSE OF HW WATCHDOG AND LEDs. | |
120 | *******************************************************************/ | |
d1c3b275 SR |
121 | addi r3, 0, PB7AP |
122 | mtdcr EBC0_CFGADDR, r3 | |
6d0f6bcf JCPV |
123 | addis r4, 0, CONFIG_SYS_W7O_EBC_PB7AP@h |
124 | ori r4, r4, CONFIG_SYS_W7O_EBC_PB7AP@l | |
d1c3b275 | 125 | mtdcr EBC0_CFGDATA, r4 |
c609719b | 126 | |
d1c3b275 SR |
127 | addi r3, 0, PB7CR |
128 | mtdcr EBC0_CFGADDR, r3 | |
6d0f6bcf JCPV |
129 | addis r4, 0, CONFIG_SYS_W7O_EBC_PB7CR@h |
130 | ori r4, r4, CONFIG_SYS_W7O_EBC_PB7CR@l | |
d1c3b275 | 131 | mtdcr EBC0_CFGDATA, r4 |
c609719b WD |
132 | |
133 | /* We are all done */ | |
134 | mtlr r0 /* Restore link register */ | |
135 | blr /* Return to calling function */ | |
136 | .Lfe0: .size ext_bus_cntlr_init,.Lfe0-ext_bus_cntlr_init | |
137 | /* end ext_bus_cntlr_init() */ | |
138 | ||
139 | /****************************************************************************** | |
140 | * Function: sdram_init | |
141 | * | |
142 | * Description: Configures SDRAM memory banks. | |
143 | * | |
144 | * Serial Presence Detect, "SPD," reads the SDRAM EEPROM | |
145 | * via the IIC bus and then configures the SDRAM memory | |
146 | * banks appropriately. If Auto Memory Configuration is | |
147 | * is not used, it is assumed that a 4MB 11x8x2, non-ECC, | |
148 | * SDRAM is soldered down. | |
149 | * | |
150 | * Notes: Expects that the stack is already setup. | |
151 | *****************************************************************************/ | |
152 | .section ".text" | |
153 | .align 2 | |
154 | .globl sdram_init | |
155 | .type sdram_init, @function | |
156 | sdram_init: | |
157 | /* save the return info on stack */ | |
158 | mflr r0 /* Get link register */ | |
159 | stwu r1, -8(r1) /* Save back chain and move SP */ | |
160 | stw r0, +12(r1) /* Save link register */ | |
161 | ||
162 | /* | |
163 | * First call spd_sdram to try to init SDRAM according to the | |
164 | * contents of the SPD EEPROM. If the SPD EEPROM is blank or | |
165 | * erronious, spd_sdram returns 0 in R3. | |
166 | */ | |
db2f721f | 167 | li r3,0 |
c609719b WD |
168 | bl spd_sdram |
169 | addic. r3, r3, 0 /* Check for error, save dram size */ | |
170 | bne ..sdri_done /* If it worked, we're done... */ | |
171 | ||
172 | /******************************************************************** | |
173 | * If SPD detection fails, we'll default to 4MB, 11x8x2, as this | |
174 | * is the SMALLEST SDRAM size the 405 supports. We can do this | |
175 | * because W7O boards have soldered on RAM, and there will always | |
176 | * be some amount present. If we were using DIMMs, we should hang | |
177 | * the board instead, since it doesn't have any RAM to continue | |
178 | * running with. | |
179 | *******************************************************************/ | |
180 | ||
181 | /* | |
182 | * Disable memory controller to allow | |
183 | * values to be changed. | |
184 | */ | |
95b602ba | 185 | addi r3, 0, SDRAM0_CFG |
d1c3b275 | 186 | mtdcr SDRAM0_CFGADDR, r3 |
c609719b WD |
187 | addis r4, 0, 0x0 |
188 | ori r4, r4, 0x0 | |
d1c3b275 | 189 | mtdcr SDRAM0_CFGDATA, r4 |
c609719b WD |
190 | |
191 | /* | |
192 | * Set MB0CF for ext bank 0. (0-4MB) Address Mode 5 since 11x8x2 | |
193 | * All other banks are disabled. | |
194 | */ | |
95b602ba | 195 | addi r3, 0, SDRAM0_B0CR |
d1c3b275 | 196 | mtdcr SDRAM0_CFGADDR, r3 |
c609719b WD |
197 | addis r4, 0, 0x0000 /* BA=0x0, SZ=4MB */ |
198 | ori r4, r4, 0x8001 /* Mode is 5, 11x8x2or4, BE=Enabled */ | |
d1c3b275 | 199 | mtdcr SDRAM0_CFGDATA, r4 |
c609719b WD |
200 | |
201 | /* Clear MB1CR,MB2CR,MB3CR to turn other banks off */ | |
202 | addi r4, 0, 0 /* Zero the data reg */ | |
203 | ||
204 | addi r3, r3, 4 /* Point to MB1CF reg */ | |
d1c3b275 SR |
205 | mtdcr SDRAM0_CFGADDR, r3 /* Set the address */ |
206 | mtdcr SDRAM0_CFGDATA, r4 /* Zero the reg */ | |
c609719b WD |
207 | |
208 | addi r3, r3, 4 /* Point to MB2CF reg */ | |
d1c3b275 SR |
209 | mtdcr SDRAM0_CFGADDR, r3 /* Set the address */ |
210 | mtdcr SDRAM0_CFGDATA, r4 /* Zero the reg */ | |
c609719b WD |
211 | |
212 | addi r3, r3, 4 /* Point to MB3CF reg */ | |
d1c3b275 SR |
213 | mtdcr SDRAM0_CFGADDR, r3 /* Set the address */ |
214 | mtdcr SDRAM0_CFGDATA, r4 /* Zero the reg */ | |
c609719b WD |
215 | |
216 | /******************************************************************** | |
217 | * Set the SDRAM Timing reg, SDTR1 and the refresh timer reg, RTR. | |
218 | * To set the appropriate timings, we assume sdram is | |
219 | * 100MHz (pc100 compliant). | |
220 | *******************************************************************/ | |
221 | ||
222 | /* | |
223 | * Set up SDTR1 | |
224 | */ | |
95b602ba | 225 | addi r3, 0, SDRAM0_TR |
d1c3b275 | 226 | mtdcr SDRAM0_CFGADDR, r3 |
c609719b WD |
227 | addis r4, 0, 0x0086 /* SDTR1 value for 100Mhz */ |
228 | ori r4, r4, 0x400D | |
d1c3b275 | 229 | mtdcr SDRAM0_CFGDATA, r4 |
c609719b WD |
230 | |
231 | /* | |
232 | * Set RTR | |
233 | */ | |
95b602ba | 234 | addi r3, 0, SDRAM0_RTR |
d1c3b275 | 235 | mtdcr SDRAM0_CFGADDR, r3 |
c609719b | 236 | addis r4, 0, 0x05F0 /* RTR refresh val = 15.625ms@100Mhz */ |
d1c3b275 | 237 | mtdcr SDRAM0_CFGDATA, r4 |
c609719b WD |
238 | |
239 | /******************************************************************** | |
240 | * Delay to ensure 200usec have elapsed since reset. Assume worst | |
241 | * case that the core is running 200Mhz: | |
242 | * 200,000,000 (cycles/sec) X .000200 (sec) = 0x9C40 cycles | |
243 | *******************************************************************/ | |
244 | addis r3, 0, 0x0000 | |
245 | ori r3, r3, 0xA000 /* Wait 200us from reset */ | |
246 | mtctr r3 | |
247 | ..spinlp2: | |
248 | bdnz ..spinlp2 /* spin loop */ | |
249 | ||
250 | /******************************************************************** | |
251 | * Set memory controller options reg, MCOPT1. | |
252 | *******************************************************************/ | |
95b602ba | 253 | addi r3, 0, SDRAM0_CFG |
d1c3b275 | 254 | mtdcr SDRAM0_CFGADDR, r3 |
c609719b WD |
255 | addis r4, 0, 0x80E0 /* DC_EN=1,SRE=0,PME=0,MEMCHK=0 */ |
256 | ori r4, r4, 0x0000 /* REGEN=0,DRW=00,BRPF=01,ECCDD=1 */ | |
d1c3b275 | 257 | mtdcr SDRAM0_CFGDATA, r4 /* EMDULR=1 */ |
c609719b WD |
258 | |
259 | ..sdri_done: | |
260 | /* restore and return */ | |
261 | lwz r0, +12(r1) /* Get saved link register */ | |
262 | addi r1, r1, +8 /* Remove frame from stack */ | |
263 | mtlr r0 /* Restore link register */ | |
264 | blr /* Return to calling function */ | |
265 | .Lfe1: .size sdram_init,.Lfe1-sdram_init | |
266 | /* end sdram_init() */ |