1 /*------------------------------------------------------------------------------+
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.
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.
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.
18 * COPYRIGHT I B M CORPORATION 1995
19 * LICENSED MATERIAL - PROGRAM PROPERTY OF I B M
20 *-------------------------------------------------------------------------------*/
22 /*-----------------------------------------------------------------------------
23 * Function: ext_bus_cntlr_init
24 * Description: Initializes the External Bus Controller for the external
25 * peripherals. IMPORTANT: For pass1 this code must run from
26 * cache since you can not reliably change a peripheral banks
27 * timing register (pbxap) while running code from that bank.
28 * For ex., since we are running from ROM on bank 0, we can NOT
29 * execute the code that modifies bank 0 timings from ROM, so
30 * we run it from cache.
31 * Bank 0 - Flash or Multi Purpose Socket
32 * Bank 1 - Multi Purpose Socket or Flash (set in C-Code)
33 * Bank 2 - UART 1 (set in C-Code)
34 * Bank 3 - UART 2 (set in C-Code)
38 * Bank 7 - PLD Register
39 *-----------------------------------------------------------------------------*/
42 #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
44 #include <configs/MIP405.h>
45 #include <ppc_asm.tmpl>
48 #include <asm/cache.h>
53 .globl ext_bus_cntlr_init
55 mflr r4 /* save link register */
56 mfdcr r3,strap /* get strapping reg */
57 andi. r0, r3, PSR_ROM_LOC /* mask out irrelevant bits */
58 bnelr /* jump back if PCI boot */
62 mflr r3 /* get address of ..getAddr */
63 mtlr r4 /* restore link register */
64 addi r4,0,14 /* set ctr to 14; used to prefetch */
65 mtctr r4 /* 14 cache lines to fit this function */
66 /* in cache (gives us 8x14=112 instrctns) */
68 icbt r0,r3 /* prefetch cache line for addr in r3 */
69 addi r3,r3,32 /* move to next cache line */
70 bdnz ..ebcloop /* continue for 14 cache lines */
72 /*-------------------------------------------------------------------
73 * Delay to ensure all accesses to ROM are complete before changing
75 *------------------------------------------------------------------- */
80 bdnz ..spinlp /* spin loop */
82 /*-----------------------------------------------------------------------
84 *----------------------------------------------------------------------- */
89 andi. r0, r4, 0x2000 /* mask out irrelevant bits */
90 beq 0f /* jump if 8 bit bus width */
92 /* setup 16 bit things (Flash Boot)
93 *-----------------------------------------------------------------------
94 * Memory Bank 0 (16 Bit Flash) initialization
95 *---------------------------------------------------------------------- */
99 /* addis r4,0,0xFF8F */
100 /* ori r4,r4,0xFE80 */
101 /* addis r4,0,0x9B01 */
102 /* ori r4,r4,0x5480 */
103 addis r4,0,(FLASH_AP_B)@h
104 ori r4,r4,(FLASH_AP_B)@l
109 /* BS=0x010(4MB),BU=0x3(R/W), */
110 /* addis r4,0,((FLASH_BASE0_PRELIM & 0xFFF00000) | 0x00050000)@h */
111 /* ori r4,r4,0xA000 / * BW=0x01(16 bits) */
112 addis r4,0,(FLASH_CR_B)@h
113 ori r4,r4,(FLASH_CR_B)@l
119 /* 8Bit boot mode: */
120 /*-----------------------------------------------------------------------
121 * Memory Bank 0 Multi Purpose Socket initialization
122 *----------------------------------------------------------------------- */
123 /* 0x7F8FFE80 slowest boot */
130 addis r4,0,(MPS_AP_B)@h
131 ori r4,r4,(MPS_AP_B)@l
137 /* BS=0x010(4MB),BU=0x3(R/W), */
138 /* addis r4,0,((FLASH_BASE0_PRELIM & 0xFFF00000) | 0x00050000)@h */
139 /* ori r4,r4,0x8000 / * BW=0x0( 8 bits) */
141 addis r4,0,(MPS_CR_B)@h
142 ori r4,r4,(MPS_CR_B)@l
148 /*-----------------------------------------------------------------------
149 * Memory Bank 2-3-4-5-6 (not used) initialization
150 *-----------------------------------------------------------------------*/
192 nop /* pass2 DCR errata #8 */
195 /*-----------------------------------------------------------------------------
196 * Function: sdram_init
197 * Description: Configures the internal SRAM memory. and setup the
198 * Stackpointer in it.
199 *----------------------------------------------------------------------------- */
208 #if defined(CONFIG_BOOT_PCI)
209 .section .bootpg,"ax"
211 /*******************************************
215 /* first handle errata #68 / PCI_18 */
216 iccci r0, r0 /* invalidate I-cache */
218 mticcr r31 /* ICCR = 0 (all uncachable) */
221 mfccr0 r28 /* set CCR0[24] = 1 */
225 /* setup PMM0MA (0xEF400004) and PMM0PCIHA (0xEF40000C) */
227 addi r28, r28, 0x0004
228 stw r31, 0x0C(r28) /* clear PMM0PCIHA */
229 lis r29, 0xFFF8 /* open 512 kByte */
230 addi r29, r29, 0x0001/* and enable this region */
231 stwbrx r29, r0, r28 /* write PMM0MA */
233 lis r28, 0xEEC0 /* address of PCIC0_CFGADDR */
234 addi r29, r28, 4 /* add 4 to r29 -> PCIC0_CFGDATA */
236 lis r31, 0x8000 /* set en bit bus 0 */
237 ori r31, r31, 0x304C/* device 6 func 0 reg 4C (XBCS register) */
238 stwbrx r31, r0, r28 /* write it */
240 lwbrx r31, r0, r29 /* load XBCS register */
241 oris r31, r31, 0x02C4/* clear BIOSCS WPE, set lower, extended and 1M extended BIOS enable */
242 stwbrx r31, r0, r29 /* write back XBCS register */
246 b _start /* normal start */