+++ /dev/null
-/*
- L2CR functions
- Copyright © 1997-1998 by PowerLogix R & D, Inc.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-*/
-/*
- Thur, Dec. 12, 1998.
- - First public release, contributed by PowerLogix.
- ***********
- Sat, Aug. 7, 1999.
- - Terry: Made sure code disabled interrupts before running. (Previously
- it was assumed interrupts were already disabled).
- - Terry: Updated for tentative G4 support. 4MB of memory is now flushed
- instead of 2MB. (Prob. only 3 is necessary).
- - Terry: Updated for workaround to HID0[DPM] processor bug
- during global invalidates.
- ***********
- Thu, July 13, 2000.
- - Terry: Added isync to correct for an errata.
-
- 22 August 2001.
- - DanM: Finally added the 7450 patch I've had for the past
- several months. The L2CR is similar, but I'm going
- to assume the user of this functions knows what they
- are doing.
-
- Author: Terry Greeniaus (tgree@phys.ualberta.ca)
- Please e-mail updates to this file to me, thanks!
-*/
-#include <linux/config.h>
-#include <asm/processor.h>
-#include <asm/cputable.h>
-#include <asm/ppc_asm.h>
-#include <asm/cache.h>
-#include <asm/page.h>
-
-/* Usage:
-
- When setting the L2CR register, you must do a few special
- things. If you are enabling the cache, you must perform a
- global invalidate. If you are disabling the cache, you must
- flush the cache contents first. This routine takes care of
- doing these things. When first enabling the cache, make sure
- you pass in the L2CR you want, as well as passing in the
- global invalidate bit set. A global invalidate will only be
- performed if the L2I bit is set in applyThis. When enabling
- the cache, you should also set the L2E bit in applyThis. If
- you want to modify the L2CR contents after the cache has been
- enabled, the recommended procedure is to first call
- __setL2CR(0) to disable the cache and then call it again with
- the new values for L2CR. Examples:
-
- _setL2CR(0) - disables the cache
- _setL2CR(0xB3A04000) - enables my G3 upgrade card:
- - L2E set to turn on the cache
- - L2SIZ set to 1MB
- - L2CLK set to 1:1
- - L2RAM set to pipelined synchronous late-write
- - L2I set to perform a global invalidation
- - L2OH set to 0.5 nS
- - L2DF set because this upgrade card
- requires it
-
- A similar call should work for your card. You need to know
- the correct setting for your card and then place them in the
- fields I have outlined above. Other fields support optional
- features, such as L2DO which caches only data, or L2TS which
- causes cache pushes from the L1 cache to go to the L2 cache
- instead of to main memory.
-
-IMPORTANT:
- Starting with the 7450, the bits in this register have moved
- or behave differently. The Enable, Parity Enable, Size,
- and L2 Invalidate are the only bits that have not moved.
- The size is read-only for these processors with internal L2
- cache, and the invalidate is a control as well as status.
- -- Dan
-
-*/
-/*
- * Summary: this procedure ignores the L2I bit in the value passed in,
- * flushes the cache if it was already enabled, always invalidates the
- * cache, then enables the cache if the L2E bit is set in the value
- * passed in.
- * -- paulus.
- */
-_GLOBAL(_set_L2CR)
- /* Make sure this is a 750 or 7400 chip */
-BEGIN_FTR_SECTION
- li r3,-1
- blr
-END_FTR_SECTION_IFCLR(CPU_FTR_L2CR)
-
- mflr r9
-
- /* Stop DST streams */
-BEGIN_FTR_SECTION
- DSSALL
- sync
-END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
-
- /* Turn off interrupts and data relocation. */
- mfmsr r7 /* Save MSR in r7 */
- rlwinm r4,r7,0,17,15
- rlwinm r4,r4,0,28,26 /* Turn off DR bit */
- sync
- mtmsr r4
- isync
-
- /* Before we perform the global invalidation, we must disable dynamic
- * power management via HID0[DPM] to work around a processor bug where
- * DPM can possibly interfere with the state machine in the processor
- * that invalidates the L2 cache tags.
- */
- mfspr r8,HID0 /* Save HID0 in r8 */
- rlwinm r4,r8,0,12,10 /* Turn off HID0[DPM] */
- sync
- mtspr HID0,r4 /* Disable DPM */
- sync
-
- /* Get the current enable bit of the L2CR into r4 */
- mfspr r4,L2CR
-
- /* Tweak some bits */
- rlwinm r5,r3,0,0,0 /* r5 contains the new enable bit */
- rlwinm r3,r3,0,11,9 /* Turn off the invalidate bit */
- rlwinm r3,r3,0,1,31 /* Turn off the enable bit */
-
- /* Check to see if we need to flush */
- rlwinm. r4,r4,0,0,0
- beq 2f
-
- /* Flush the cache. First, read the first 4MB of memory (physical) to
- * put new data in the cache. (Actually we only need
- * the size of the L2 cache plus the size of the L1 cache, but 4MB will
- * cover everything just to be safe).
- */
-
- /**** Might be a good idea to set L2DO here - to prevent instructions
- from getting into the cache. But since we invalidate
- the next time we enable the cache it doesn't really matter.
- Don't do this unless you accomodate all processor variations.
- The bit moved on the 7450.....
- ****/
-
- /* TODO: use HW flush assist when available */
-
- lis r4,0x0002
- mtctr r4
- li r4,0
-1:
- lwzx r0,r0,r4
- addi r4,r4,32 /* Go to start of next cache line */
- bdnz 1b
- isync
-
- /* Now, flush the first 4MB of memory */
- lis r4,0x0002
- mtctr r4
- li r4,0
- sync
-1:
- dcbf 0,r4
- addi r4,r4,32 /* Go to start of next cache line */
- bdnz 1b
-
-2:
- /* Set up the L2CR configuration bits (and switch L2 off) */
- /* CPU errata: Make sure the mtspr below is already in the
- * L1 icache
- */
- b 20f
- .balign L1_CACHE_LINE_SIZE
-22:
- sync
- mtspr L2CR,r3
- sync
- b 23f
-20:
- b 21f
-21: sync
- isync
- b 22b
-
-23:
- /* Perform a global invalidation */
- oris r3,r3,0x0020
- sync
- mtspr L2CR,r3
- sync
- isync /* For errata */
-
-BEGIN_FTR_SECTION
- /* On the 7450, we wait for the L2I bit to clear......
- */
-10: mfspr r3,L2CR
- andis. r4,r3,0x0020
- bne 10b
- b 11f
-END_FTR_SECTION_IFSET(CPU_FTR_SPEC7450)
-
- /* Wait for the invalidation to complete */
-3: mfspr r3,L2CR
- rlwinm. r4,r3,0,31,31
- bne 3b
-
-11: rlwinm r3,r3,0,11,9 /* Turn off the L2I bit */
- sync
- mtspr L2CR,r3
- sync
-
- /* See if we need to enable the cache */
- cmplwi r5,0
- beq 4f
-
- /* Enable the cache */
- oris r3,r3,0x8000
- mtspr L2CR,r3
- sync
-
-4:
-
- /* Restore HID0[DPM] to whatever it was before */
- sync
- mtspr 1008,r8
- sync
-
- /* Restore MSR (restores EE and DR bits to original state) */
- SYNC
- mtmsr r7
- isync
-
- mtlr r9
- blr
-
-_GLOBAL(_get_L2CR)
- /* Return the L2CR contents */
- li r3,0
-BEGIN_FTR_SECTION
- mfspr r3,L2CR
-END_FTR_SECTION_IFSET(CPU_FTR_L2CR)
- blr
-
-
-/*
- * Here is a similar routine for dealing with the L3 cache
- * on the 745x family of chips
- */
-
-_GLOBAL(_set_L3CR)
- /* Make sure this is a 745x chip */
-BEGIN_FTR_SECTION
- li r3,-1
- blr
-END_FTR_SECTION_IFCLR(CPU_FTR_L3CR)
-
- /* Turn off interrupts and data relocation. */
- mfmsr r7 /* Save MSR in r7 */
- rlwinm r4,r7,0,17,15
- rlwinm r4,r4,0,28,26 /* Turn off DR bit */
- sync
- mtmsr r4
- isync
-
- /* Stop DST streams */
- DSSALL
- sync
-
- /* Get the current enable bit of the L3CR into r4 */
- mfspr r4,SPRN_L3CR
-
- /* Tweak some bits */
- rlwinm r5,r3,0,0,0 /* r5 contains the new enable bit */
- rlwinm r3,r3,0,22,20 /* Turn off the invalidate bit */
- rlwinm r3,r3,0,2,31 /* Turn off the enable & PE bits */
- rlwinm r3,r3,0,5,3 /* Turn off the clken bit */
- /* Check to see if we need to flush */
- rlwinm. r4,r4,0,0,0
- beq 2f
-
- /* Flush the cache.
- */
-
- /* TODO: use HW flush assist */
-
- lis r4,0x0008
- mtctr r4
- li r4,0
-1:
- lwzx r0,r0,r4
- dcbf 0,r4
- addi r4,r4,32 /* Go to start of next cache line */
- bdnz 1b
-
-2:
- /* Set up the L3CR configuration bits (and switch L3 off) */
- sync
- mtspr SPRN_L3CR,r3
- sync
-
- oris r3,r3,L3CR_L3RES@h /* Set reserved bit 5 */
- mtspr SPRN_L3CR,r3
- sync
- oris r3,r3,L3CR_L3CLKEN@h /* Set clken */
- mtspr SPRN_L3CR,r3
- sync
-
- /* Wait for stabilize */
- li r0,256
- mtctr r0
-1: bdnz 1b
-
- /* Perform a global invalidation */
- ori r3,r3,0x0400
- sync
- mtspr SPRN_L3CR,r3
- sync
- isync
-
- /* We wait for the L3I bit to clear...... */
-10: mfspr r3,SPRN_L3CR
- andi. r4,r3,0x0400
- bne 10b
-
- /* Clear CLKEN */
- rlwinm r3,r3,0,5,3 /* Turn off the clken bit */
- mtspr SPRN_L3CR,r3
- sync
-
- /* Wait for stabilize */
- li r0,256
- mtctr r0
-1: bdnz 1b
-
- /* See if we need to enable the cache */
- cmplwi r5,0
- beq 4f
-
- /* Enable the cache */
- oris r3,r3,(L3CR_L3E | L3CR_L3CLKEN)@h
- mtspr SPRN_L3CR,r3
- sync
-
- /* Wait for stabilize */
- li r0,256
- mtctr r0
-1: bdnz 1b
-
- /* Restore MSR (restores EE and DR bits to original state) */
-4: SYNC
- mtmsr r7
- isync
- blr
-
-_GLOBAL(_get_L3CR)
- /* Return the L3CR contents */
- li r3,0
-BEGIN_FTR_SECTION
- mfspr r3,SPRN_L3CR
-END_FTR_SECTION_IFSET(CPU_FTR_L3CR)
- blr
-
-/* --- End of PowerLogix code ---
- */
-
-
-/* flush_disable_L1() - Flush and disable L1 cache
- *
- * clobbers r0, r3, ctr, cr0
- * Must be called with interrupts disabled and MMU enabled.
- */
-_GLOBAL(__flush_disable_L1)
- /* Stop pending alitvec streams and memory accesses */
-BEGIN_FTR_SECTION
- DSSALL
-END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
- sync
-
- /* Load counter to 0x4000 cache lines (512k) and
- * load cache with datas
- */
- li r3,0x4000 /* 512kB / 32B */
- mtctr r3
- lis r3,KERNELBASE@h
-1:
- lwz r0,0(r3)
- addi r3,r3,0x0020 /* Go to start of next cache line */
- bdnz 1b
- isync
- sync
-
- /* Now flush those cache lines */
- li r3,0x4000 /* 512kB / 32B */
- mtctr r3
- lis r3,KERNELBASE@h
-1:
- dcbf 0,r3
- addi r3,r3,0x0020 /* Go to start of next cache line */
- bdnz 1b
- sync
-
- /* We can now disable the L1 cache (HID0:DCE, HID0:ICE) */
- mfspr r3,SPRN_HID0
- rlwinm r3,r3,0,18,15
- mtspr SPRN_HID0,r3
- sync
- isync
- blr
-
-/* inval_enable_L1 - Invalidate and enable L1 cache
- *
- * Assumes L1 is already disabled and MSR:EE is off
- *
- * clobbers r3
- */
-_GLOBAL(__inval_enable_L1)
- /* Enable and then Flash inval the instruction & data cache */
- mfspr r3,SPRN_HID0
- ori r3,r3, HID0_ICE|HID0_ICFI|HID0_DCE|HID0_DCI
- sync
- isync
- mtspr SPRN_HID0,r3
- xori r3,r3, HID0_ICFI|HID0_DCI
- mtspr SPRN_HID0,r3
- sync
-
- blr
-
-
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