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
37 * Bank 6 - used to switch on the 12V for the Multipurpose socket
38 * Bank 7 - Config Register
39 *-----------------------------------------------------------------------------*/
42 #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
44 #include <configs/PIP405.h>
45 #include <ppc_asm.tmpl>
48 #include <asm/cache.h>
52 .globl ext_bus_cntlr_init
54 mflr r4 /* save link register */
55 mfdcr r3,strap /* get strapping reg */
56 andi. r0, r3, PSR_ROM_LOC /* mask out irrelevant bits */
57 bnelr /* jump back if PCI boot */
61 mflr r3 /* get address of ..getAddr */
62 mtlr r4 /* restore link register */
63 addi r4,0,14 /* set ctr to 14; used to prefetch */
64 mtctr r4 /* 14 cache lines to fit this function */
65 /* in cache (gives us 8x14=112 instrctns) */
67 icbt r0,r3 /* prefetch cache line for addr in r3 */
68 addi r3,r3,32 /* move to next cache line */
69 bdnz ..ebcloop /* continue for 14 cache lines */
71 /*-------------------------------------------------------------------
72 * Delay to ensure all accesses to ROM are complete before changing
74 *------------------------------------------------------------------- */
79 bdnz ..spinlp /* spin loop */
81 /*-----------------------------------------------------------------------
83 *----------------------------------------------------------------------- */
88 andi. r0, r4, 0x2000 /* mask out irrelevant bits */
89 beq 0f /* jump if 8 bit bus width */
91 /* setup 16 bit things
92 *-----------------------------------------------------------------------
93 * Memory Bank 0 (16 Bit Flash) initialization
94 *---------------------------------------------------------------------- */
98 addis r4,0,(FLASH_AP_B)@h
99 ori r4,r4,(FLASH_AP_B)@l
104 /* BS=0x010(4MB),BU=0x3(R/W), */
105 addis r4,0,(FLASH_CR_B)@h
106 ori r4,r4,(FLASH_CR_B)@l
111 /* 8Bit boot mode: */
112 /*-----------------------------------------------------------------------
113 * Memory Bank 0 Multi Purpose Socket initialization
114 *----------------------------------------------------------------------- */
115 /* 0x7F8FFE80 slowest boot */
118 addis r4,0,(MPS_AP_B)@h
119 ori r4,r4,(MPS_AP_B)@l
124 /* BS=0x010(4MB),BU=0x3(R/W), */
125 addis r4,0,(MPS_CR_B)@h
126 ori r4,r4,(MPS_CR_B)@l
131 /*-----------------------------------------------------------------------
132 * Memory Bank 2-3-4-5-6 (not used) initialization
133 *-----------------------------------------------------------------------*/
175 nop /* pass2 DCR errata #8 */
178 /*-----------------------------------------------------------------------------
179 * Function: sdram_init
180 * Description: Configures the internal SRAM memory. and setup the
181 * Stackpointer in it.
182 *----------------------------------------------------------------------------- */
191 #if defined(CONFIG_BOOT_PCI)
192 .section .bootpg,"ax"
194 /*******************************************
198 /* first handle errata #68 / PCI_18 */
199 iccci r0, r0 /* invalidate I-cache */
201 mticcr r31 /* ICCR = 0 (all uncachable) */
204 mfccr0 r28 /* set CCR0[24] = 1 */
208 /* setup PMM0MA (0xEF400004) and PMM0PCIHA (0xEF40000C) */
210 addi r28, r28, 0x0004
211 stw r31, 0x0C(r28) /* clear PMM0PCIHA */
212 lis r29, 0xFFF8 /* open 512 kByte */
213 addi r29, r29, 0x0001/* and enable this region */
214 stwbrx r29, r0, r28 /* write PMM0MA */
216 lis r28, 0xEEC0 /* address of PCIC0_CFGADDR */
217 addi r29, r28, 4 /* add 4 to r29 -> PCIC0_CFGDATA */
219 lis r31, 0x8000 /* set en bit bus 0 */
220 ori r31, r31, 0x304C/* device 6 func 0 reg 4C (XBCS register) */
221 stwbrx r31, r0, r28 /* write it */
223 lwbrx r31, r0, r29 /* load XBCS register */
224 oris r31, r31, 0x02C4/* clear BIOSCS WPE, set lower, extended and 1M extended BIOS enable */
225 stwbrx r31, r0, r29 /* write back XBCS register */
229 b _start /* normal start */