added DoC support
This commit is contained in:
Ronald G. Minnich
parent
81b6860bae
commit
7fb6bba49f
1 changed files with 132 additions and 2 deletions
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@ -18,6 +18,7 @@
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* set the right value.
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*/
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#define INIT_MCR $0xf6641000
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#define WRITE_MCR0 movl %ecx, %eax ; outl %eax, %dx
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/*#include <cpu/p5/start32.inc>*/
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.org 0xfe000
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.code16
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@ -73,12 +74,20 @@ code16
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/* I will leave this here for now, but you should also set it later. */
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xorl %edi, %edi
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movb $0x6c, %al
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CALLSP(pci_read_dword)
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movl $0x8000006c, %eax
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mov $0x0cf8,%dx
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outl %eax,%dx
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/* movb $0x8000006c, %al
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CALLSP(pci_read_dword)*/
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movb $0xfc, %dl
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inl %dx, %eax
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andl $0xfffc, %ecx
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orl INIT_MCR, %ecx
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WRITE_MCR0
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/*
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movb $0x6c, %al
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CALLSP(pci_write_dword)
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*/
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rorl $16, %ecx
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/* test 8 bit CAS */
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movb $0, 0
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@ -100,8 +109,11 @@ sizeram:
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rorl $16, %ecx
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/* clear the 'no multi page' bit. */
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andw $0xefff, %cx
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WRITE_MCR0
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/*
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mov $0x6c, %al
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CALLSP(pci_write_dword)
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*/
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/* size is now in cx[19:16] */
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/* now size the dram */
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/* you had best have at least 32M; that's as small as we go */
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@ -126,8 +138,11 @@ sizeram:
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rol $20, %ecx
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/* set 4 banks. */
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orb $1, %cl
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WRITE_MCR0
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/*
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mov $0x6c, %al
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CALLSP(pci_write_dword)
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*/
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/* bank detect */
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/* you don't need to even care how large CAS is.
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* Just set 4-bank mode, and set non-zero numbers into a few places.
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@ -143,14 +158,128 @@ sizeram:
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1:
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/* clear 4 banks */
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andb $0xfe, %cl
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WRITE_MCR0
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/*
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mov $0x6c, %al
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CALLSP(pci_write_dword)
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*/
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/* at this point, dram slot 0 is up. we hope. */
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/* now for flash ... */
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/* NOTE: MUST NOT DESTROY %ecx! */
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/* INPUT: %al, the register. %ecx, the write data */
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/* Following code courtesy Ollie Lho: */
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/*
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* ipl.S: Initial Program Loader (IPL) for SiS 630 and M-System DoC Millennium
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*
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*
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* Copyright 2000 Silicon Integrated Systems Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*
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* Reference:
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* 1. SiS 630 Specification
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* 2. System Management Bus Specification Rev 1.1
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* 3. PC SDRAM Serial Presence Detect (SPD) Specification Rev 1.2B
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* 4. Booting From the DiskOnChip Millennium, M-Systems Application Note Ap-DOC-044
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* APR-2000, 93-SR-001-44-7L REV. 1.0
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*
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* $Id$
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*/
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#define DOC_WIN_SEG 0xfe00
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#define DOC_STACK_SEG 0x0400
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#define SPL_RAM_SEG 0x8000
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#define DOC_SPL_START_BLK 2 /* 0,1 for IPL */
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#define DOC_SPL_SIZE_IN_PAGE 126 /* 1 page = 512 bytes, total 63kB */
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ipl_start:
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/* O.K. we have DRAM now, so set up STACK for CALL/RET */
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movw $DOC_STACK_SEG, %ax
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movw %ax, %ss
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movw $SPL_RAM_SEG, %ax
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movw %ax, %es
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xorl %sp, %sp # clear %sp
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xorl %edx, %edx # clear %dx, start of RAM
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xorl %esi, %esi
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xorl %edi, %edi
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movw $0x800, %si # point %si to CDSN Data area
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movw $0x1000, %di # point %di to CDSN Control area
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movl $DOC_SPL_START_BLK, %ebp # start page of LinuxBIOS
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movb $0x84, %al # Reset DOC Millennium
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call doc_reset
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movb $0x85, %al # Turn into Normal Mode
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call doc_reset
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read_next_page:
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movw $0x1000, %di # point %di to CDSN Control area
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flash_command:
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movb $0x03, 0x04(%edi) # start command cycle
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movb $0x00, (%esi) # issue flash command Read00
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call doc_cycle_end
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movw %bp, %bx # %bp is current page number
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flash_address:
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shll $0x08, %ebx
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movb $0x03, %cl # this one is DANGEROUS but I am
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# sure the upper 3 bytes == 0x00
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movb $0x05, 0x04(%edi) # start address cycle
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0:
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movb %bl, (%esi) # write address to CDSNIO
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shrw $0x08, %bx # shift next address byte
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loop 0b
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call doc_cycle_end
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wait_for_flash_ready:
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/* delay by reding NOP register before polling the FLASH READY bit,
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this is inlined to save a call/ret pair */
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doc_delay:
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movb $0x04, %cl # this one is DANGEROUS but I am
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# sure the upper 3 bytes == 0x00
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0:
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movb 0x20(%edi), %al # read DOC NOP retisger
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loop 0b # four times
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testb $0x80, 0x04(%edi) # is flash ready ?
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jz wait_for_flash_ready
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movb 0x1d(%edi), %al # init read pipeline
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movw $0x100, %cx # 1 page = 512 bytes
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movw $0x800, %si # point %si to CDSN Data area
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movw %dx, %di # restore saved current destination
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rep
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movsw
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movw %di, %dx # save current destination
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incw %bp # increse current page number
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cmpw $128, %bp # moved 63 KB ??
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jl read_next_page # no, read next page
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sis630ipl_end:
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jmp spl_vector # jump to SPL vector
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/* we don't need these. We only do I/O to MCR 0 */
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#if 0
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pci_write_dword:
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mov $0,%ah
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mov $0x80000000,%edx
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@ -173,6 +302,7 @@ pci_read_dword:
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inl %dx, %eax
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mov %eax, %ecx
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RETSP
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#endif
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.org 0xfe1f0
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reset_vector:
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