| /* |
| * SPDX-License-Identifier: GPL-2.0 IBM-pibs |
| */ |
| /*----------------------------------------------------------------------------- */ |
| /* 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 <asm/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 !!!! */ |
