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Diffstat (limited to 'board/esd/pci405/writeibm.S')
| -rw-r--r-- | board/esd/pci405/writeibm.S | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/board/esd/pci405/writeibm.S b/board/esd/pci405/writeibm.S new file mode 100644 index 0000000..b08c9ac --- /dev/null +++ b/board/esd/pci405/writeibm.S @@ -0,0 +1,235 @@ +/*------------------------------------------------------------------------------+ */ +/* */ +/* This source code has been made available to you by IBM on an AS-IS */ +/* basis. Anyone receiving this source is licensed under IBM */ +/* copyrights to use it in any way he or she deems fit, including */ +/* copying it, modifying it, compiling it, and redistributing it either */ +/* with or without modifications. No license under IBM patents or */ +/* patent applications is to be implied by the copyright license. */ +/* */ +/* Any user of this software should understand that IBM cannot provide */ +/* technical support for this software and will not be responsible for */ +/* any consequences resulting from the use of this software. */ +/* */ +/* Any person who transfers this source code or any derivative work */ +/* must include the IBM copyright notice, this paragraph, and the */ +/* preceding two paragraphs in the transferred software. */ +/* */ +/* COPYRIGHT I B M CORPORATION 1995 */ +/* LICENSED MATERIAL - PROGRAM PROPERTY OF I B M */ +/*------------------------------------------------------------------------------- */ + +/*----------------------------------------------------------------------------- */ +/* Function: ext_bus_cntlr_init */ +/* Description: Initializes the External Bus Controller for the external */ +/* peripherals. IMPORTANT: For pass1 this code must run from */ +/* cache since you can not reliably change a peripheral banks */ +/* timing register (pbxap) while running code from that bank. */ +/* For ex., since we are running from ROM on bank 0, we can NOT */ +/* execute the code that modifies bank 0 timings from ROM, so */ +/* we run it from cache. */ +/* Bank 0 - Flash and SRAM */ +/* Bank 1 - NVRAM/RTC */ +/* Bank 2 - Keyboard/Mouse controller */ +/* Bank 3 - IR controller */ +/* Bank 4 - not used */ +/* Bank 5 - not used */ +/* Bank 6 - not used */ +/* Bank 7 - FPGA registers */ +/*----------------------------------------------------------------------------- */ +#include <ppc4xx.h> + +#include <ppc_asm.tmpl> +#include <ppc_defs.h> + +#include <asm/cache.h> +#include <asm/mmu.h> + + + .globl write_without_sync +write_without_sync: + /* + * Write one values to host via pci busmastering + * ptr = 0xc0000000 -> 0x01000000 (PCI) + * *ptr = 0x01234567; + */ + addi r31,0,0 + lis r31,0xc000 + +start1: + lis r0,0x0123 + ori r0,r0,0x4567 + stw r0,0(r31) + + /* + * Read one value back + * ptr = (volatile unsigned long *)addr; + * val = *ptr; + */ + + lwz r0,0(r31) + + /* + * One pci config write + * ibmPciConfigWrite(0x2e, 2, 0x1234); + */ + /* subsystem id */ + + + + li r4,0x002C + oris r4,r4,0x8000 + lis r3,0xEEC0 + stwbrx r4,0,r3 + + li r5,0x1234 + ori r3,r3,0x4 + stwbrx r5,0,r3 + + b start1 + + blr /* never reached !!!! */ + + + + .globl write_with_sync +write_with_sync: + /* + * Write one values to host via pci busmastering + * ptr = 0xc0000000 -> 0x01000000 (PCI) + * *ptr = 0x01234567; + */ + addi r31,0,0 + lis r31,0xc000 + +start2: + lis r0,0x0123 + ori r0,r0,0x4567 + stw r0,0(r31) + + /* + * Read one value back + * ptr = (volatile unsigned long *)addr; + * val = *ptr; + */ + + lwz r0,0(r31) + + /* + * One pci config write + * ibmPciConfigWrite(0x2e, 2, 0x1234); + */ + /* subsystem id */ + + + + li r4,0x002C + oris r4,r4,0x8000 + lis r3,0xEEC0 + stwbrx r4,0,r3 + sync + + li r5,0x1234 + ori r3,r3,0x4 + stwbrx r5,0,r3 + sync + + b start2 + + blr /* never reached !!!! */ + + + .globl write_with_less_sync +write_with_less_sync: + /* + * Write one values to host via pci busmastering + * ptr = 0xc0000000 -> 0x01000000 (PCI) + * *ptr = 0x01234567; + */ + addi r31,0,0 + lis r31,0xc000 + +start2b: + lis r0,0x0123 + ori r0,r0,0x4567 + stw r0,0(r31) + + /* + * Read one value back + * ptr = (volatile unsigned long *)addr; + * val = *ptr; + */ + + lwz r0,0(r31) + + /* + * One pci config write + * ibmPciConfigWrite(0x2e, 2, 0x1234); + */ + /* subsystem id */ + + + + li r4,0x002C + oris r4,r4,0x8000 + lis r3,0xEEC0 + stwbrx r4,0,r3 + sync + + li r5,0x1234 + ori r3,r3,0x4 + stwbrx r5,0,r3 +/* sync */ + + b start2b + + blr /* never reached !!!! */ + + + .globl write_with_more_sync +write_with_more_sync: + /* + * Write one values to host via pci busmastering + * ptr = 0xc0000000 -> 0x01000000 (PCI) + * *ptr = 0x01234567; + */ + addi r31,0,0 + lis r31,0xc000 + +start3: + lis r0,0x0123 + ori r0,r0,0x4567 + stw r0,0(r31) + sync + + /* + * Read one value back + * ptr = (volatile unsigned long *)addr; + * val = *ptr; + */ + + lwz r0,0(r31) + sync + + /* + * One pci config write + * ibmPciConfigWrite(0x2e, 2, 0x1234); + */ + /* subsystem id (PCIC0_SBSYSVID)*/ + + + + li r4,0x002C + oris r4,r4,0x8000 + lis r3,0xEEC0 + stwbrx r4,0,r3 + sync + + li r5,0x1234 + ori r3,r3,0x4 + stwbrx r5,0,r3 + sync + + b start3 + + blr /* never reached !!!! */ |