| /* |
| * (C) Copyright 2004 |
| * Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <mpc8xx.h> |
| #include <ppc_asm.tmpl> |
| #include <asm/cache.h> |
| |
| #define CACHE_CMD_ENABLE 0x02000000 |
| #define CACHE_CMD_DISABLE 0x04000000 |
| #define CACHE_CMD_LOAD_LOCK 0x06000000 |
| #define CACHE_CMD_UNLOCK_LINE 0x08000000 |
| #define CACHE_CMD_UNLOCK_ALL 0x0A000000 |
| #define CACHE_CMD_INVALIDATE 0x0C000000 |
| #define SPEED_PLPRCR_WAIT_5CYC 150 |
| #define _CACHE_ALIGN_SIZE 16 |
| |
| |
| .text |
| .align 2 |
| .globl plprcr_write_866 |
| |
| /* |
| * void plprcr_write_866 (long plprcr) |
| * Write PLPRCR, including workaround for device errata SIU4 and SIU9. |
| */ |
| |
| plprcr_write_866: |
| mfspr r10, LR /* save the Link Register value */ |
| |
| /* turn instruction cache on (no MMU required for instructions) |
| */ |
| lis r4, CACHE_CMD_ENABLE@h |
| ori r4, r4, CACHE_CMD_ENABLE@l |
| mtspr IC_CST, r4 |
| isync |
| |
| /* clear IC_CST error bits |
| */ |
| mfspr r4, IC_CST |
| |
| bl plprcr_here |
| |
| plprcr_here: |
| mflr r5 |
| |
| /* calculate relocation offset |
| */ |
| lis r4, plprcr_here@h |
| ori r4, r4, plprcr_here@l |
| sub r5, r5, r4 |
| |
| /* calculate first address of this function |
| */ |
| lis r6, plprcr_write_866@h |
| ori r6, r6, plprcr_write_866@l |
| add r6, r6, r5 |
| |
| /* calculate end address of this function |
| */ |
| lis r7, plprcr_end@h |
| ori r7, r7, plprcr_end@l |
| add r7, r7, r5 |
| |
| /* load and lock code addresses |
| */ |
| mr r5, r6 |
| |
| plprcr_loop: |
| mtspr IC_ADR, r5 |
| addi r5, r5, _CACHE_ALIGN_SIZE /* increment by one line */ |
| |
| lis r4, CACHE_CMD_LOAD_LOCK@h |
| ori r4, r4, CACHE_CMD_LOAD_LOCK@l |
| mtspr IC_CST, r4 |
| isync |
| |
| cmpw r5, r7 |
| blt plprcr_loop |
| |
| /* IC_CST error bits not evaluated |
| */ |
| |
| /* switch PLPRCR |
| */ |
| mfspr r4, IMMR /* read IMMR */ |
| rlwinm r4, r4, 0, 0, 15 /* only high 16 bits count */ |
| |
| /* write sequence according to MPC866 Errata |
| */ |
| stw r3, PLPRCR(r4) |
| isync |
| |
| lis r3, SPEED_PLPRCR_WAIT_5CYC@h |
| ori r3, r3, SPEED_PLPRCR_WAIT_5CYC@l |
| |
| plprcr_wait: |
| cmpwi r3, 0 |
| beq plprcr_wait_end |
| nop |
| subi r3, r3, 1 |
| b plprcr_wait |
| |
| plprcr_wait_end: |
| |
| /* unlock instruction cache but leave it enabled |
| */ |
| lis r4, CACHE_CMD_UNLOCK_ALL@h |
| ori r4, r4, CACHE_CMD_UNLOCK_ALL@l |
| mtspr IC_CST, r4 |
| isync |
| |
| mtspr LR, r10 /* restore original Link Register value */ |
| blr |
| |
| plprcr_end: |
