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https://github.com/AsahiLinux/u-boot
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135 lines
2.9 KiB
ArmAsm
135 lines
2.9 KiB
ArmAsm
/*
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* (C) Copyright 2004
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (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., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <mpc8xx.h>
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#include <ppc_asm.tmpl>
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#include <asm/cache.h>
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#define CACHE_CMD_ENABLE 0x02000000
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#define CACHE_CMD_DISABLE 0x04000000
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#define CACHE_CMD_LOAD_LOCK 0x06000000
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#define CACHE_CMD_UNLOCK_LINE 0x08000000
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#define CACHE_CMD_UNLOCK_ALL 0x0A000000
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#define CACHE_CMD_INVALIDATE 0x0C000000
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#define SPEED_PLPRCR_WAIT_5CYC 150
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#define _CACHE_ALIGN_SIZE 16
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.text
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.align 2
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.globl plprcr_write_866
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/*
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* void plprcr_write_866 (long plprcr)
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* Write PLPRCR, including workaround for device errata SIU4 and SIU9.
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*/
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plprcr_write_866:
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mfspr r10, LR /* save the Link Register value */
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/* turn instruction cache on (no MMU required for instructions)
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*/
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lis r4, CACHE_CMD_ENABLE@h
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ori r4, r4, CACHE_CMD_ENABLE@l
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mtspr IC_CST, r4
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isync
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/* clear IC_CST error bits
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*/
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mfspr r4, IC_CST
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bl plprcr_here
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plprcr_here:
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mflr r5
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/* calculate relocation offset
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*/
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lis r4, plprcr_here@h
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ori r4, r4, plprcr_here@l
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sub r5, r5, r4
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/* calculate first address of this function
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*/
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lis r6, plprcr_write_866@h
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ori r6, r6, plprcr_write_866@l
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add r6, r6, r5
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/* calculate end address of this function
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*/
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lis r7, plprcr_end@h
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ori r7, r7, plprcr_end@l
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add r7, r7, r5
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/* load and lock code addresses
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*/
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mr r5, r6
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plprcr_loop:
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mtspr IC_ADR, r5
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addi r5, r5, _CACHE_ALIGN_SIZE /* increment by one line */
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lis r4, CACHE_CMD_LOAD_LOCK@h
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ori r4, r4, CACHE_CMD_LOAD_LOCK@l
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mtspr IC_CST, r4
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isync
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cmpw r5, r7
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blt plprcr_loop
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/* IC_CST error bits not evaluated
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*/
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/* switch PLPRCR
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*/
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mfspr r4, IMMR /* read IMMR */
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rlwinm r4, r4, 0, 0, 15 /* only high 16 bits count */
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/* write sequence according to MPC866 Errata
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*/
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stw r3, PLPRCR(r4)
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isync
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lis r3, SPEED_PLPRCR_WAIT_5CYC@h
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ori r3, r3, SPEED_PLPRCR_WAIT_5CYC@l
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plprcr_wait:
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cmpwi r3, 0
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beq plprcr_wait_end
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nop
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subi r3, r3, 1
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b plprcr_wait
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plprcr_wait_end:
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/* unlock instruction cache but leave it enabled
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*/
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lis r4, CACHE_CMD_UNLOCK_ALL@h
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ori r4, r4, CACHE_CMD_UNLOCK_ALL@l
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mtspr IC_CST, r4
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isync
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mtspr LR, r10 /* restore original Link Register value */
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blr
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plprcr_end:
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