| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | /* | 
					
						
							|  |  |  |  *  linux/arch/arm/mm/proc-xscale.S | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  *  Author:	Nicolas Pitre | 
					
						
							|  |  |  |  *  Created:	November 2000 | 
					
						
							|  |  |  |  *  Copyright:	(C) 2000, 2001 MontaVista Software Inc. | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  * This program is free software; you can redistribute it and/or modify
 | 
					
						
							|  |  |  |  * it under the terms of the GNU General Public License version 2 as | 
					
						
							|  |  |  |  * published by the Free Software Foundation. | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  * MMU functions for the Intel XScale CPUs | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  * 2001 Aug 21: | 
					
						
							|  |  |  |  *	some contributions by Brett Gaines <brett.w.gaines@intel.com>
 | 
					
						
							|  |  |  |  *	Copyright 2001 by Intel Corp. | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  * 2001 Sep 08: | 
					
						
							|  |  |  |  *	Completely revisited, many important fixes | 
					
						
							| 
									
										
										
										
											2009-09-14 03:25:28 -04:00
										 |  |  |  *	Nicolas Pitre <nico@fluxnic.net>
 | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  |  */ | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | #include <linux/linkage.h> | 
					
						
							|  |  |  | #include <linux/init.h> | 
					
						
							|  |  |  | #include <asm/assembler.h> | 
					
						
							| 
									
										
										
										
											2008-09-07 19:15:31 +01:00
										 |  |  | #include <asm/hwcap.h> | 
					
						
							| 
									
										
										
										
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										 |  |  | #include <asm/pgtable.h> | 
					
						
							| 
									
										
										
										
											2006-03-25 22:08:55 +00:00
										 |  |  | #include <asm/pgtable-hwdef.h> | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | #include <asm/page.h> | 
					
						
							|  |  |  | #include <asm/ptrace.h> | 
					
						
							|  |  |  | #include "proc-macros.S" | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  * This is the maximum size of an area which will be flushed.  If the area | 
					
						
							|  |  |  |  * is larger than this, then we flush the whole cache | 
					
						
							|  |  |  |  */ | 
					
						
							|  |  |  | #define MAX_AREA_SIZE	32768 | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  * the cache line size of the I and D cache | 
					
						
							|  |  |  |  */ | 
					
						
							|  |  |  | #define CACHELINESIZE	32 | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  * the size of the data cache | 
					
						
							|  |  |  |  */ | 
					
						
							|  |  |  | #define CACHESIZE	32768 | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  * Virtual address used to allocate the cache when flushed | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  * This must be an address range which is _never_ used.  It should | 
					
						
							|  |  |  |  * apparently have a mapping in the corresponding page table for | 
					
						
							|  |  |  |  * compatibility with future CPUs that _could_ require it.  For instance we | 
					
						
							|  |  |  |  * don't care. | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  * This must be aligned on a 2*CACHESIZE boundary.  The code selects one of | 
					
						
							|  |  |  |  * the 2 areas in alternance each time the clean_d_cache macro is used. | 
					
						
							|  |  |  |  * Without this the XScale core exhibits cache eviction problems and no one | 
					
						
							|  |  |  |  * knows why. | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  * Reminder: the vector table is located at 0xffff0000-0xffff0fff. | 
					
						
							|  |  |  |  */ | 
					
						
							|  |  |  | #define CLEAN_ADDR	0xfffe0000 | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  * This macro is used to wait for a CP15 write and is needed | 
					
						
							|  |  |  |  * when we have to ensure that the last operation to the co-pro | 
					
						
							|  |  |  |  * was completed before continuing with operation. | 
					
						
							|  |  |  |  */ | 
					
						
							|  |  |  | 	.macro	cpwait, rd | 
					
						
							|  |  |  | 	mrc	p15, 0, \rd, c2, c0, 0		@ arbitrary read of cp15
 | 
					
						
							|  |  |  | 	mov	\rd, \rd			@ wait for completion
 | 
					
						
							|  |  |  | 	sub 	pc, pc, #4			@ flush instruction pipeline
 | 
					
						
							|  |  |  | 	.endm | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | 	.macro	cpwait_ret, lr, rd | 
					
						
							|  |  |  | 	mrc	p15, 0, \rd, c2, c0, 0		@ arbitrary read of cp15
 | 
					
						
							|  |  |  | 	sub	pc, \lr, \rd, LSR #32		@ wait for completion and
 | 
					
						
							|  |  |  | 						@ flush instruction pipeline
 | 
					
						
							|  |  |  | 	.endm | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  * This macro cleans the entire dcache using line allocate. | 
					
						
							|  |  |  |  * The main loop has been unrolled to reduce loop overhead. | 
					
						
							|  |  |  |  * rd and rs are two scratch registers. | 
					
						
							|  |  |  |  */ | 
					
						
							|  |  |  | 	.macro  clean_d_cache, rd, rs | 
					
						
							|  |  |  | 	ldr	\rs, =clean_addr | 
					
						
							|  |  |  | 	ldr	\rd, [\rs] | 
					
						
							|  |  |  | 	eor	\rd, \rd, #CACHESIZE | 
					
						
							|  |  |  | 	str	\rd, [\rs] | 
					
						
							|  |  |  | 	add	\rs, \rd, #CACHESIZE | 
					
						
							|  |  |  | 1:	mcr	p15, 0, \rd, c7, c2, 5		@ allocate D cache line
 | 
					
						
							|  |  |  | 	add	\rd, \rd, #CACHELINESIZE | 
					
						
							|  |  |  | 	mcr	p15, 0, \rd, c7, c2, 5		@ allocate D cache line
 | 
					
						
							|  |  |  | 	add	\rd, \rd, #CACHELINESIZE | 
					
						
							|  |  |  | 	mcr	p15, 0, \rd, c7, c2, 5		@ allocate D cache line
 | 
					
						
							|  |  |  | 	add	\rd, \rd, #CACHELINESIZE | 
					
						
							|  |  |  | 	mcr	p15, 0, \rd, c7, c2, 5		@ allocate D cache line
 | 
					
						
							|  |  |  | 	add	\rd, \rd, #CACHELINESIZE | 
					
						
							|  |  |  | 	teq	\rd, \rs | 
					
						
							|  |  |  | 	bne	1b | 
					
						
							|  |  |  | 	.endm | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | 	.data | 
					
						
							|  |  |  | clean_addr:	.word	CLEAN_ADDR | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | 	.text | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  * cpu_xscale_proc_init() | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  * Nothing too exciting at the moment | 
					
						
							|  |  |  |  */ | 
					
						
							|  |  |  | ENTRY(cpu_xscale_proc_init) | 
					
						
							| 
									
										
										
										
											2008-03-13 09:53:21 +01:00
										 |  |  | 	@ enable write buffer coalescing. Some bootloader disable it
 | 
					
						
							|  |  |  | 	mrc	p15, 0, r1, c1, c0, 1 | 
					
						
							|  |  |  | 	bic	r1, r1, #1 | 
					
						
							|  |  |  | 	mcr	p15, 0, r1, c1, c0, 1 | 
					
						
							| 
									
										
										
										
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										 |  |  | 	mov	pc, lr | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  * cpu_xscale_proc_fin() | 
					
						
							|  |  |  |  */ | 
					
						
							|  |  |  | ENTRY(cpu_xscale_proc_fin) | 
					
						
							|  |  |  | 	mrc	p15, 0, r0, c1, c0, 0		@ ctrl register
 | 
					
						
							|  |  |  | 	bic	r0, r0, #0x1800			@ ...IZ...........
 | 
					
						
							|  |  |  | 	bic	r0, r0, #0x0006			@ .............CA.
 | 
					
						
							|  |  |  | 	mcr	p15, 0, r0, c1, c0, 0		@ disable caches
 | 
					
						
							| 
									
										
										
										
											2010-07-26 12:22:12 +01:00
										 |  |  | 	mov	pc, lr | 
					
						
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										 |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  * cpu_xscale_reset(loc) | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  * Perform a soft reset of the system.  Put the CPU into the | 
					
						
							|  |  |  |  * same state as it would be if it had been reset, and branch | 
					
						
							|  |  |  |  * to what would be the reset vector. | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  * loc: location to jump to for soft reset | 
					
						
							| 
									
										
										
										
											2006-07-01 21:29:32 +01:00
										 |  |  |  * | 
					
						
							|  |  |  |  * Beware PXA270 erratum E7. | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  |  */ | 
					
						
							|  |  |  | 	.align	5
 | 
					
						
							| 
									
										
										
										
											2011-11-15 13:25:04 +00:00
										 |  |  | 	.pushsection	.idmap.text, "ax" | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | ENTRY(cpu_xscale_reset) | 
					
						
							|  |  |  | 	mov	r1, #PSR_F_BIT|PSR_I_BIT|SVC_MODE | 
					
						
							|  |  |  | 	msr	cpsr_c, r1			@ reset CPSR
 | 
					
						
							| 
									
										
										
										
											2006-07-01 21:29:32 +01:00
										 |  |  | 	mcr	p15, 0, r1, c10, c4, 1		@ unlock I-TLB
 | 
					
						
							|  |  |  | 	mcr	p15, 0, r1, c8, c5, 0		@ invalidate I-TLB
 | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 	mrc	p15, 0, r1, c1, c0, 0		@ ctrl register
 | 
					
						
							|  |  |  | 	bic	r1, r1, #0x0086			@ ........B....CA.
 | 
					
						
							|  |  |  | 	bic	r1, r1, #0x3900			@ ..VIZ..S........
 | 
					
						
							| 
									
										
										
										
											2006-07-01 21:29:32 +01:00
										 |  |  | 	sub	pc, pc, #4			@ flush pipeline
 | 
					
						
							|  |  |  | 	@ *** cache line aligned ***
 | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 	mcr	p15, 0, r1, c1, c0, 0		@ ctrl register
 | 
					
						
							|  |  |  | 	bic	r1, r1, #0x0001			@ ...............M
 | 
					
						
							| 
									
										
										
										
											2006-07-01 21:29:32 +01:00
										 |  |  | 	mcr	p15, 0, ip, c7, c7, 0		@ invalidate I,D caches & BTB
 | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 	mcr	p15, 0, r1, c1, c0, 0		@ ctrl register
 | 
					
						
							|  |  |  | 	@ CAUTION: MMU turned off from this point. We count on the pipeline
 | 
					
						
							|  |  |  | 	@ already containing those two last instructions to survive.
 | 
					
						
							|  |  |  | 	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
 | 
					
						
							|  |  |  | 	mov	pc, r0 | 
					
						
							| 
									
										
										
										
											2011-11-15 13:25:04 +00:00
										 |  |  | ENDPROC(cpu_xscale_reset) | 
					
						
							|  |  |  | 	.popsection | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  * cpu_xscale_do_idle() | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  * Cause the processor to idle | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  * For now we do nothing but go to idle mode for every case | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  * XScale supports clock switching, but using idle mode support | 
					
						
							|  |  |  |  * allows external hardware to react to system state changes. | 
					
						
							|  |  |  |  */ | 
					
						
							|  |  |  | 	.align	5
 | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | ENTRY(cpu_xscale_do_idle) | 
					
						
							|  |  |  | 	mov	r0, #1 | 
					
						
							|  |  |  | 	mcr	p14, 0, r0, c7, c0, 0		@ Go to IDLE
 | 
					
						
							|  |  |  | 	mov	pc, lr | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* ================================= CACHE ================================ */ | 
					
						
							|  |  |  | 
 | 
					
						
							| 
									
										
										
										
											2010-10-28 11:27:40 +01:00
										 |  |  | /* | 
					
						
							|  |  |  |  *	flush_icache_all() | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  *	Unconditionally clean and invalidate the entire icache. | 
					
						
							|  |  |  |  */ | 
					
						
							|  |  |  | ENTRY(xscale_flush_icache_all) | 
					
						
							|  |  |  | 	mov	r0, #0 | 
					
						
							|  |  |  | 	mcr	p15, 0, r0, c7, c5, 0		@ invalidate I cache
 | 
					
						
							|  |  |  | 	mov	pc, lr | 
					
						
							|  |  |  | ENDPROC(xscale_flush_icache_all) | 
					
						
							|  |  |  | 
 | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | /* | 
					
						
							|  |  |  |  *	flush_user_cache_all() | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  *	Invalidate all cache entries in a particular address | 
					
						
							|  |  |  |  *	space. | 
					
						
							|  |  |  |  */ | 
					
						
							|  |  |  | ENTRY(xscale_flush_user_cache_all) | 
					
						
							|  |  |  | 	/* FALLTHROUGH */ | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  *	flush_kern_cache_all() | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  *	Clean and invalidate the entire cache. | 
					
						
							|  |  |  |  */ | 
					
						
							|  |  |  | ENTRY(xscale_flush_kern_cache_all) | 
					
						
							|  |  |  | 	mov	r2, #VM_EXEC | 
					
						
							|  |  |  | 	mov	ip, #0 | 
					
						
							|  |  |  | __flush_whole_cache: | 
					
						
							|  |  |  | 	clean_d_cache r0, r1 | 
					
						
							|  |  |  | 	tst	r2, #VM_EXEC | 
					
						
							|  |  |  | 	mcrne	p15, 0, ip, c7, c5, 0		@ Invalidate I cache & BTB
 | 
					
						
							|  |  |  | 	mcrne	p15, 0, ip, c7, c10, 4		@ Drain Write (& Fill) Buffer
 | 
					
						
							|  |  |  | 	mov	pc, lr | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  *	flush_user_cache_range(start, end, vm_flags) | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  *	Invalidate a range of cache entries in the specified | 
					
						
							|  |  |  |  *	address space. | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  *	- start - start address (may not be aligned) | 
					
						
							|  |  |  |  *	- end	- end address (exclusive, may not be aligned) | 
					
						
							|  |  |  |  *	- vma	- vma_area_struct describing address space | 
					
						
							|  |  |  |  */ | 
					
						
							|  |  |  | 	.align	5
 | 
					
						
							|  |  |  | ENTRY(xscale_flush_user_cache_range) | 
					
						
							|  |  |  | 	mov	ip, #0 | 
					
						
							|  |  |  | 	sub	r3, r1, r0			@ calculate total size
 | 
					
						
							|  |  |  | 	cmp	r3, #MAX_AREA_SIZE | 
					
						
							|  |  |  | 	bhs	__flush_whole_cache | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | 1:	tst	r2, #VM_EXEC | 
					
						
							|  |  |  | 	mcrne	p15, 0, r0, c7, c5, 1		@ Invalidate I cache line
 | 
					
						
							|  |  |  | 	mcr	p15, 0, r0, c7, c10, 1		@ Clean D cache line
 | 
					
						
							|  |  |  | 	mcr	p15, 0, r0, c7, c6, 1		@ Invalidate D cache line
 | 
					
						
							|  |  |  | 	add	r0, r0, #CACHELINESIZE | 
					
						
							|  |  |  | 	cmp	r0, r1 | 
					
						
							|  |  |  | 	blo	1b | 
					
						
							|  |  |  | 	tst	r2, #VM_EXEC | 
					
						
							|  |  |  | 	mcrne	p15, 0, ip, c7, c5, 6		@ Invalidate BTB
 | 
					
						
							|  |  |  | 	mcrne	p15, 0, ip, c7, c10, 4		@ Drain Write (& Fill) Buffer
 | 
					
						
							|  |  |  | 	mov	pc, lr | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  *	coherent_kern_range(start, end) | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  *	Ensure coherency between the Icache and the Dcache in the | 
					
						
							|  |  |  |  *	region described by start.  If you have non-snooping | 
					
						
							|  |  |  |  *	Harvard caches, you need to implement this function. | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  *	- start  - virtual start address | 
					
						
							|  |  |  |  *	- end	 - virtual end address | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  *	Note: single I-cache line invalidation isn't used here since | 
					
						
							|  |  |  |  *	it also trashes the mini I-cache used by JTAG debuggers. | 
					
						
							|  |  |  |  */ | 
					
						
							|  |  |  | ENTRY(xscale_coherent_kern_range) | 
					
						
							| 
									
										
										
										
											2006-02-01 19:26:01 +00:00
										 |  |  | 	bic	r0, r0, #CACHELINESIZE - 1 | 
					
						
							|  |  |  | 1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
 | 
					
						
							|  |  |  | 	add	r0, r0, #CACHELINESIZE | 
					
						
							|  |  |  | 	cmp	r0, r1 | 
					
						
							|  |  |  | 	blo	1b | 
					
						
							|  |  |  | 	mov	r0, #0 | 
					
						
							|  |  |  | 	mcr	p15, 0, r0, c7, c5, 0		@ Invalidate I cache & BTB
 | 
					
						
							|  |  |  | 	mcr	p15, 0, r0, c7, c10, 4		@ Drain Write (& Fill) Buffer
 | 
					
						
							|  |  |  | 	mov	pc, lr | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  *	coherent_user_range(start, end) | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  *	Ensure coherency between the Icache and the Dcache in the | 
					
						
							|  |  |  |  *	region described by start.  If you have non-snooping | 
					
						
							|  |  |  |  *	Harvard caches, you need to implement this function. | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  *	- start  - virtual start address | 
					
						
							|  |  |  |  *	- end	 - virtual end address | 
					
						
							|  |  |  |  */ | 
					
						
							|  |  |  | ENTRY(xscale_coherent_user_range) | 
					
						
							|  |  |  | 	bic	r0, r0, #CACHELINESIZE - 1 | 
					
						
							|  |  |  | 1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
 | 
					
						
							| 
									
										
										
										
											2006-02-01 19:26:01 +00:00
										 |  |  | 	mcr	p15, 0, r0, c7, c5, 1		@ Invalidate I cache entry
 | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 	add	r0, r0, #CACHELINESIZE | 
					
						
							|  |  |  | 	cmp	r0, r1 | 
					
						
							|  |  |  | 	blo	1b | 
					
						
							|  |  |  | 	mov	r0, #0 | 
					
						
							| 
									
										
										
										
											2006-02-01 19:26:01 +00:00
										 |  |  | 	mcr	p15, 0, r0, c7, c5, 6		@ Invalidate BTB
 | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 	mcr	p15, 0, r0, c7, c10, 4		@ Drain Write (& Fill) Buffer
 | 
					
						
							|  |  |  | 	mov	pc, lr | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							| 
									
										
										
										
											2009-11-26 12:56:21 +00:00
										 |  |  |  *	flush_kern_dcache_area(void *addr, size_t size) | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  |  * | 
					
						
							|  |  |  |  *	Ensure no D cache aliasing occurs, either with itself or | 
					
						
							|  |  |  |  *	the I cache | 
					
						
							|  |  |  |  * | 
					
						
							| 
									
										
										
										
											2009-11-26 12:56:21 +00:00
										 |  |  |  *	- addr	- kernel address | 
					
						
							|  |  |  |  *	- size	- region size | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  |  */ | 
					
						
							| 
									
										
										
										
											2009-11-26 12:56:21 +00:00
										 |  |  | ENTRY(xscale_flush_kern_dcache_area) | 
					
						
							|  |  |  | 	add	r1, r0, r1 | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
 | 
					
						
							|  |  |  | 	mcr	p15, 0, r0, c7, c6, 1		@ invalidate D entry
 | 
					
						
							|  |  |  | 	add	r0, r0, #CACHELINESIZE | 
					
						
							|  |  |  | 	cmp	r0, r1 | 
					
						
							|  |  |  | 	blo	1b | 
					
						
							|  |  |  | 	mov	r0, #0 | 
					
						
							|  |  |  | 	mcr	p15, 0, r0, c7, c5, 0		@ Invalidate I cache & BTB
 | 
					
						
							|  |  |  | 	mcr	p15, 0, r0, c7, c10, 4		@ Drain Write (& Fill) Buffer
 | 
					
						
							|  |  |  | 	mov	pc, lr | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  *	dma_inv_range(start, end) | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  *	Invalidate (discard) the specified virtual address range. | 
					
						
							|  |  |  |  *	May not write back any entries.  If 'start' or 'end' | 
					
						
							|  |  |  |  *	are not cache line aligned, those lines must be written | 
					
						
							|  |  |  |  *	back. | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  *	- start  - virtual start address | 
					
						
							|  |  |  |  *	- end	 - virtual end address | 
					
						
							|  |  |  |  */ | 
					
						
							| 
									
										
										
										
											2009-11-26 16:24:19 +00:00
										 |  |  | xscale_dma_inv_range: | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 	tst	r0, #CACHELINESIZE - 1 | 
					
						
							|  |  |  | 	bic	r0, r0, #CACHELINESIZE - 1 | 
					
						
							|  |  |  | 	mcrne	p15, 0, r0, c7, c10, 1		@ clean D entry
 | 
					
						
							|  |  |  | 	tst	r1, #CACHELINESIZE - 1 | 
					
						
							|  |  |  | 	mcrne	p15, 0, r1, c7, c10, 1		@ clean D entry
 | 
					
						
							|  |  |  | 1:	mcr	p15, 0, r0, c7, c6, 1		@ invalidate D entry
 | 
					
						
							|  |  |  | 	add	r0, r0, #CACHELINESIZE | 
					
						
							|  |  |  | 	cmp	r0, r1 | 
					
						
							|  |  |  | 	blo	1b | 
					
						
							|  |  |  | 	mcr	p15, 0, r0, c7, c10, 4		@ Drain Write (& Fill) Buffer
 | 
					
						
							|  |  |  | 	mov	pc, lr | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  *	dma_clean_range(start, end) | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  *	Clean the specified virtual address range. | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  *	- start  - virtual start address | 
					
						
							|  |  |  |  *	- end	 - virtual end address | 
					
						
							|  |  |  |  */ | 
					
						
							| 
									
										
										
										
											2009-11-26 16:24:19 +00:00
										 |  |  | xscale_dma_clean_range: | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 	bic	r0, r0, #CACHELINESIZE - 1 | 
					
						
							|  |  |  | 1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
 | 
					
						
							|  |  |  | 	add	r0, r0, #CACHELINESIZE | 
					
						
							|  |  |  | 	cmp	r0, r1 | 
					
						
							|  |  |  | 	blo	1b | 
					
						
							|  |  |  | 	mcr	p15, 0, r0, c7, c10, 4		@ Drain Write (& Fill) Buffer
 | 
					
						
							|  |  |  | 	mov	pc, lr | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  *	dma_flush_range(start, end) | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  *	Clean and invalidate the specified virtual address range. | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  *	- start  - virtual start address | 
					
						
							|  |  |  |  *	- end	 - virtual end address | 
					
						
							|  |  |  |  */ | 
					
						
							|  |  |  | ENTRY(xscale_dma_flush_range) | 
					
						
							|  |  |  | 	bic	r0, r0, #CACHELINESIZE - 1 | 
					
						
							|  |  |  | 1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
 | 
					
						
							|  |  |  | 	mcr	p15, 0, r0, c7, c6, 1		@ invalidate D entry
 | 
					
						
							|  |  |  | 	add	r0, r0, #CACHELINESIZE | 
					
						
							|  |  |  | 	cmp	r0, r1 | 
					
						
							|  |  |  | 	blo	1b | 
					
						
							|  |  |  | 	mcr	p15, 0, r0, c7, c10, 4		@ Drain Write (& Fill) Buffer
 | 
					
						
							|  |  |  | 	mov	pc, lr | 
					
						
							|  |  |  | 
 | 
					
						
							| 
									
										
										
										
											2009-11-26 16:19:58 +00:00
										 |  |  | /* | 
					
						
							|  |  |  |  *	dma_map_area(start, size, dir) | 
					
						
							|  |  |  |  *	- start	- kernel virtual start address | 
					
						
							|  |  |  |  *	- size	- size of region | 
					
						
							|  |  |  |  *	- dir	- DMA direction | 
					
						
							|  |  |  |  */ | 
					
						
							|  |  |  | ENTRY(xscale_dma_map_area) | 
					
						
							|  |  |  | 	add	r1, r1, r0 | 
					
						
							|  |  |  | 	cmp	r2, #DMA_TO_DEVICE | 
					
						
							|  |  |  | 	beq	xscale_dma_clean_range | 
					
						
							|  |  |  | 	bcs	xscale_dma_inv_range | 
					
						
							|  |  |  | 	b	xscale_dma_flush_range | 
					
						
							|  |  |  | ENDPROC(xscale_dma_map_area) | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  *	dma_map_area(start, size, dir) | 
					
						
							|  |  |  |  *	- start	- kernel virtual start address | 
					
						
							|  |  |  |  *	- size	- size of region | 
					
						
							|  |  |  |  *	- dir	- DMA direction | 
					
						
							|  |  |  |  */ | 
					
						
							| 
									
										
										
										
											2011-06-23 17:26:56 +01:00
										 |  |  | ENTRY(xscale_80200_A0_A1_dma_map_area) | 
					
						
							| 
									
										
										
										
											2009-11-26 16:19:58 +00:00
										 |  |  | 	add	r1, r1, r0 | 
					
						
							|  |  |  | 	teq	r2, #DMA_TO_DEVICE | 
					
						
							|  |  |  | 	beq	xscale_dma_clean_range | 
					
						
							|  |  |  | 	b	xscale_dma_flush_range | 
					
						
							| 
									
										
										
										
											2011-06-23 17:26:56 +01:00
										 |  |  | ENDPROC(xscale_80200_A0_A1_dma_map_area) | 
					
						
							| 
									
										
										
										
											2009-11-26 16:19:58 +00:00
										 |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  *	dma_unmap_area(start, size, dir) | 
					
						
							|  |  |  |  *	- start	- kernel virtual start address | 
					
						
							|  |  |  |  *	- size	- size of region | 
					
						
							|  |  |  |  *	- dir	- DMA direction | 
					
						
							|  |  |  |  */ | 
					
						
							|  |  |  | ENTRY(xscale_dma_unmap_area) | 
					
						
							|  |  |  | 	mov	pc, lr | 
					
						
							|  |  |  | ENDPROC(xscale_dma_unmap_area) | 
					
						
							|  |  |  | 
 | 
					
						
							| 
									
										
										
										
											2012-09-06 18:35:13 +05:30
										 |  |  | 	.globl	xscale_flush_kern_cache_louis
 | 
					
						
							|  |  |  | 	.equ	xscale_flush_kern_cache_louis, xscale_flush_kern_cache_all | 
					
						
							|  |  |  | 
 | 
					
						
							| 
									
										
										
										
											2011-06-23 17:26:56 +01:00
										 |  |  | 	@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
 | 
					
						
							|  |  |  | 	define_cache_functions xscale | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 
 | 
					
						
							| 
									
										
										
										
											2006-09-16 10:52:02 +01:00
										 |  |  | /* | 
					
						
							|  |  |  |  * On stepping A0/A1 of the 80200, invalidating D-cache by line doesn't | 
					
						
							|  |  |  |  * clear the dirty bits, which means that if we invalidate a dirty line, | 
					
						
							|  |  |  |  * the dirty data can still be written back to external memory later on. | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  * The recommended workaround is to always do a clean D-cache line before | 
					
						
							|  |  |  |  * doing an invalidate D-cache line, so on the affected processors, | 
					
						
							|  |  |  |  * dma_inv_range() is implemented as dma_flush_range(). | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  * See erratum #25 of "Intel 80200 Processor Specification Update", | 
					
						
							|  |  |  |  * revision January 22, 2003, available at: | 
					
						
							|  |  |  |  *     http://www.intel.com/design/iio/specupdt/273415.htm | 
					
						
							|  |  |  |  */ | 
					
						
							| 
									
										
										
										
											2011-06-23 17:26:56 +01:00
										 |  |  | .macro a0_alias basename | 
					
						
							|  |  |  | 	.globl xscale_80200_A0_A1_\basename | 
					
						
							|  |  |  | 	.type xscale_80200_A0_A1_\basename , %function | 
					
						
							|  |  |  | 	.equ xscale_80200_A0_A1_\basename , xscale_\basename | 
					
						
							|  |  |  | .endm | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  * Most of the cache functions are unchanged for these processor revisions. | 
					
						
							|  |  |  |  * Export suitable alias symbols for the unchanged functions: | 
					
						
							|  |  |  |  */ | 
					
						
							|  |  |  | 	a0_alias flush_icache_all | 
					
						
							|  |  |  | 	a0_alias flush_user_cache_all | 
					
						
							|  |  |  | 	a0_alias flush_kern_cache_all | 
					
						
							| 
									
										
										
										
											2012-09-28 15:09:59 +01:00
										 |  |  | 	a0_alias flush_kern_cache_louis | 
					
						
							| 
									
										
										
										
											2011-06-23 17:26:56 +01:00
										 |  |  | 	a0_alias flush_user_cache_range | 
					
						
							|  |  |  | 	a0_alias coherent_kern_range | 
					
						
							|  |  |  | 	a0_alias coherent_user_range | 
					
						
							|  |  |  | 	a0_alias flush_kern_dcache_area | 
					
						
							|  |  |  | 	a0_alias dma_flush_range | 
					
						
							|  |  |  | 	a0_alias dma_unmap_area | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | 	@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
 | 
					
						
							|  |  |  | 	define_cache_functions xscale_80200_A0_A1 | 
					
						
							| 
									
										
										
										
											2006-09-16 10:52:02 +01:00
										 |  |  | 
 | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | ENTRY(cpu_xscale_dcache_clean_area) | 
					
						
							|  |  |  | 1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
 | 
					
						
							|  |  |  | 	add	r0, r0, #CACHELINESIZE | 
					
						
							|  |  |  | 	subs	r1, r1, #CACHELINESIZE | 
					
						
							|  |  |  | 	bhi	1b | 
					
						
							|  |  |  | 	mov	pc, lr | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* =============================== PageTable ============================== */ | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							|  |  |  |  * cpu_xscale_switch_mm(pgd) | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  * Set the translation base pointer to be as described by pgd. | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  * pgd: new page tables | 
					
						
							|  |  |  |  */ | 
					
						
							|  |  |  | 	.align	5
 | 
					
						
							|  |  |  | ENTRY(cpu_xscale_switch_mm) | 
					
						
							|  |  |  | 	clean_d_cache r1, r2 | 
					
						
							|  |  |  | 	mcr	p15, 0, ip, c7, c5, 0		@ Invalidate I cache & BTB
 | 
					
						
							|  |  |  | 	mcr	p15, 0, ip, c7, c10, 4		@ Drain Write (& Fill) Buffer
 | 
					
						
							|  |  |  | 	mcr	p15, 0, r0, c2, c0, 0		@ load page table pointer
 | 
					
						
							|  |  |  | 	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
 | 
					
						
							|  |  |  | 	cpwait_ret lr, ip | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | /* | 
					
						
							| 
									
										
										
										
											2006-12-13 14:34:43 +00:00
										 |  |  |  * cpu_xscale_set_pte_ext(ptep, pte, ext) | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  |  * | 
					
						
							|  |  |  |  * Set a PTE and flush it out | 
					
						
							|  |  |  |  * | 
					
						
							|  |  |  |  * Errata 40: must set memory to write-through for user read-only pages. | 
					
						
							|  |  |  |  */ | 
					
						
							| 
									
										
										
										
											2008-09-06 20:47:54 +01:00
										 |  |  | cpu_xscale_mt_table: | 
					
						
							|  |  |  | 	.long	0x00						@ L_PTE_MT_UNCACHED
 | 
					
						
							|  |  |  | 	.long	PTE_BUFFERABLE					@ L_PTE_MT_BUFFERABLE
 | 
					
						
							|  |  |  | 	.long	PTE_CACHEABLE					@ L_PTE_MT_WRITETHROUGH
 | 
					
						
							|  |  |  | 	.long	PTE_CACHEABLE | PTE_BUFFERABLE			@ L_PTE_MT_WRITEBACK
 | 
					
						
							| 
									
										
										
										
											2008-09-07 12:36:46 +01:00
										 |  |  | 	.long	PTE_EXT_TEX(1) | PTE_BUFFERABLE			@ L_PTE_MT_DEV_SHARED
 | 
					
						
							| 
									
										
										
										
											2008-09-06 21:07:45 +01:00
										 |  |  | 	.long	0x00						@ unused
 | 
					
						
							| 
									
										
										
										
											2008-09-06 20:47:54 +01:00
										 |  |  | 	.long	PTE_EXT_TEX(1) | PTE_CACHEABLE			@ L_PTE_MT_MINICACHE
 | 
					
						
							|  |  |  | 	.long	PTE_EXT_TEX(1) | PTE_CACHEABLE | PTE_BUFFERABLE	@ L_PTE_MT_WRITEALLOC
 | 
					
						
							| 
									
										
										
										
											2008-09-06 21:07:45 +01:00
										 |  |  | 	.long	0x00						@ unused
 | 
					
						
							| 
									
										
										
										
											2008-09-06 20:47:54 +01:00
										 |  |  | 	.long	PTE_BUFFERABLE					@ L_PTE_MT_DEV_WC
 | 
					
						
							|  |  |  | 	.long	0x00						@ unused
 | 
					
						
							|  |  |  | 	.long	PTE_CACHEABLE | PTE_BUFFERABLE			@ L_PTE_MT_DEV_CACHED
 | 
					
						
							|  |  |  | 	.long	0x00						@ L_PTE_MT_DEV_NONSHARED
 | 
					
						
							| 
									
										
										
										
											2008-09-07 12:42:51 +01:00
										 |  |  | 	.long	0x00						@ unused
 | 
					
						
							| 
									
										
										
										
											2008-09-06 20:47:54 +01:00
										 |  |  | 	.long	0x00						@ unused
 | 
					
						
							|  |  |  | 	.long	0x00						@ unused
 | 
					
						
							|  |  |  | 
 | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 	.align	5
 | 
					
						
							| 
									
										
										
										
											2006-12-13 14:34:43 +00:00
										 |  |  | ENTRY(cpu_xscale_set_pte_ext) | 
					
						
							| 
									
										
										
										
											2008-09-06 17:19:08 +01:00
										 |  |  | 	xscale_set_pte_ext_prologue | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 
 | 
					
						
							|  |  |  | 	@
 | 
					
						
							| 
									
										
										
										
											2008-09-06 20:47:54 +01:00
										 |  |  | 	@ Erratum 40: must set memory to write-through for user read-only pages
 | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 	@
 | 
					
						
							| 
									
										
										
										
											2010-11-16 08:40:36 +00:00
										 |  |  | 	and	ip, r1, #(L_PTE_MT_MASK | L_PTE_USER | L_PTE_RDONLY) & ~(4 << 2) | 
					
						
							|  |  |  | 	teq	ip, #L_PTE_MT_WRITEBACK | L_PTE_USER | L_PTE_RDONLY | 
					
						
							| 
									
										
										
										
											2008-09-06 20:47:54 +01:00
										 |  |  | 
 | 
					
						
							|  |  |  | 	moveq	r1, #L_PTE_MT_WRITETHROUGH | 
					
						
							|  |  |  | 	and	r1, r1, #L_PTE_MT_MASK | 
					
						
							|  |  |  | 	adr	ip, cpu_xscale_mt_table | 
					
						
							|  |  |  | 	ldr	ip, [ip, r1] | 
					
						
							|  |  |  | 	bic	r2, r2, #0x0c | 
					
						
							|  |  |  | 	orr	r2, r2, ip | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 
 | 
					
						
							| 
									
										
										
										
											2008-09-06 17:19:08 +01:00
										 |  |  | 	xscale_set_pte_ext_epilogue | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 	mov	pc, lr | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | 	.ltorg | 
					
						
							|  |  |  | 	.align | 
					
						
							|  |  |  | 
 | 
					
						
							| 
									
										
										
										
											2011-02-06 15:48:39 +00:00
										 |  |  | .globl	cpu_xscale_suspend_size
 | 
					
						
							| 
									
										
										
										
											2011-08-27 22:39:09 +01:00
										 |  |  | .equ	cpu_xscale_suspend_size, 4 * 6 | 
					
						
							| 
									
										
										
										
											2013-04-08 11:44:57 +01:00
										 |  |  | #ifdef CONFIG_ARM_CPU_SUSPEND | 
					
						
							| 
									
										
										
										
											2011-02-06 15:48:39 +00:00
										 |  |  | ENTRY(cpu_xscale_do_suspend) | 
					
						
							| 
									
										
										
										
											2011-08-27 22:39:09 +01:00
										 |  |  | 	stmfd	sp!, {r4 - r9, lr} | 
					
						
							| 
									
										
										
										
											2011-02-06 15:48:39 +00:00
										 |  |  | 	mrc	p14, 0, r4, c6, c0, 0	@ clock configuration, for turbo mode
 | 
					
						
							|  |  |  | 	mrc	p15, 0, r5, c15, c1, 0	@ CP access reg
 | 
					
						
							|  |  |  | 	mrc	p15, 0, r6, c13, c0, 0	@ PID
 | 
					
						
							|  |  |  | 	mrc	p15, 0, r7, c3, c0, 0	@ domain ID
 | 
					
						
							| 
									
										
										
										
											2011-08-27 22:39:09 +01:00
										 |  |  | 	mrc	p15, 0, r8, c1, c1, 0	@ auxiliary control reg
 | 
					
						
							|  |  |  | 	mrc	p15, 0, r9, c1, c0, 0	@ control reg
 | 
					
						
							| 
									
										
										
										
											2011-02-06 15:48:39 +00:00
										 |  |  | 	bic	r4, r4, #2		@ clear frequency change bit
 | 
					
						
							| 
									
										
										
										
											2011-08-27 22:39:09 +01:00
										 |  |  | 	stmia	r0, {r4 - r9}		@ store cp regs
 | 
					
						
							|  |  |  | 	ldmfd	sp!, {r4 - r9, pc} | 
					
						
							| 
									
										
										
										
											2011-02-06 15:48:39 +00:00
										 |  |  | ENDPROC(cpu_xscale_do_suspend) | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | ENTRY(cpu_xscale_do_resume) | 
					
						
							| 
									
										
										
										
											2011-08-27 22:39:09 +01:00
										 |  |  | 	ldmia	r0, {r4 - r9}		@ load cp regs
 | 
					
						
							| 
									
										
										
										
											2011-02-06 15:48:39 +00:00
										 |  |  | 	mov	ip, #0 | 
					
						
							|  |  |  | 	mcr	p15, 0, ip, c8, c7, 0	@ invalidate I & D TLBs
 | 
					
						
							|  |  |  | 	mcr	p15, 0, ip, c7, c7, 0	@ invalidate I & D caches, BTB
 | 
					
						
							|  |  |  | 	mcr	p14, 0, r4, c6, c0, 0	@ clock configuration, turbo mode.
 | 
					
						
							|  |  |  | 	mcr	p15, 0, r5, c15, c1, 0	@ CP access reg
 | 
					
						
							|  |  |  | 	mcr	p15, 0, r6, c13, c0, 0	@ PID
 | 
					
						
							|  |  |  | 	mcr	p15, 0, r7, c3, c0, 0	@ domain ID
 | 
					
						
							| 
									
										
										
										
											2011-08-27 22:39:09 +01:00
										 |  |  | 	mcr	p15, 0, r1, c2, c0, 0	@ translation table base addr
 | 
					
						
							|  |  |  | 	mcr	p15, 0, r8, c1, c1, 0	@ auxiliary control reg
 | 
					
						
							|  |  |  | 	mov	r0, r9			@ control register
 | 
					
						
							| 
									
										
										
										
											2011-02-06 15:48:39 +00:00
										 |  |  | 	b	cpu_resume_mmu | 
					
						
							|  |  |  | ENDPROC(cpu_xscale_do_resume) | 
					
						
							|  |  |  | #endif | 
					
						
							|  |  |  | 
 | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 	.type	__xscale_setup, #function | 
					
						
							|  |  |  | __xscale_setup: | 
					
						
							|  |  |  | 	mcr	p15, 0, ip, c7, c7, 0		@ invalidate I, D caches & BTB
 | 
					
						
							|  |  |  | 	mcr	p15, 0, ip, c7, c10, 4		@ Drain Write (& Fill) Buffer
 | 
					
						
							|  |  |  | 	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I, D TLBs
 | 
					
						
							| 
									
										
											  
											
												[ARM] 3881/4: xscale: clean up cp0/cp1 handling
XScale cores either have a DSP coprocessor (which contains a single
40 bit accumulator register), or an iWMMXt coprocessor (which contains
eight 64 bit registers.)
Because of the small amount of state in the DSP coprocessor, access to
the DSP coprocessor (CP0) is always enabled, and DSP context switching
is done unconditionally on every task switch.  Access to the iWMMXt
coprocessor (CP0/CP1) is enabled only when an iWMMXt instruction is
first issued, and iWMMXt context switching is done lazily.
CONFIG_IWMMXT is supposed to mean 'the cpu we will be running on will
have iWMMXt support', but boards are supposed to select this config
symbol by hand, and at least one pxa27x board doesn't get this right,
so on that board, proc-xscale.S will incorrectly assume that we have a
DSP coprocessor, enable CP0 on boot, and we will then only save the
first iWMMXt register (wR0) on context switches, which is Bad.
This patch redefines CONFIG_IWMMXT as 'the cpu we will be running on
might have iWMMXt support, and we will enable iWMMXt context switching
if it does.'  This means that with this patch, running a CONFIG_IWMMXT=n
kernel on an iWMMXt-capable CPU will no longer potentially corrupt iWMMXt
state over context switches, and running a CONFIG_IWMMXT=y kernel on a
non-iWMMXt capable CPU will still do DSP context save/restore.
These changes should make iWMMXt work on PXA3xx, and as a side effect,
enable proper acc0 save/restore on non-iWMMXt capable xsc3 cores such
as IOP13xx and IXP23xx (which will not have CONFIG_CPU_XSCALE defined),
as well as setting and using HWCAP_IWMMXT properly.
Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
											
										 
											2006-12-03 18:51:14 +01:00
										 |  |  | 	mov	r0, #1 << 6			@ cp6 for IOP3xx and Bulverde
 | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 	orr	r0, r0, #1 << 13		@ Its undefined whether this
 | 
					
						
							|  |  |  | 	mcr	p15, 0, r0, c15, c1, 0		@ affects USR or SVC modes
 | 
					
						
							| 
									
										
										
										
											2006-06-29 15:09:57 +01:00
										 |  |  | 
 | 
					
						
							|  |  |  | 	adr	r5, xscale_crval | 
					
						
							|  |  |  | 	ldmia	r5, {r5, r6} | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 	mrc	p15, 0, r0, c1, c0, 0		@ get control register
 | 
					
						
							|  |  |  | 	bic	r0, r0, r5 | 
					
						
							| 
									
										
										
										
											2006-06-29 15:09:57 +01:00
										 |  |  | 	orr	r0, r0, r6 | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 	mov	pc, lr | 
					
						
							|  |  |  | 	.size	__xscale_setup, . - __xscale_setup | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | 	/* | 
					
						
							|  |  |  | 	 *  R | 
					
						
							|  |  |  | 	 * .RVI ZFRS BLDP WCAM | 
					
						
							|  |  |  | 	 * ..11 1.01 .... .101 | 
					
						
							|  |  |  | 	 *  | 
					
						
							|  |  |  | 	 */ | 
					
						
							| 
									
										
										
										
											2006-06-29 15:09:57 +01:00
										 |  |  | 	.type	xscale_crval, #object | 
					
						
							|  |  |  | xscale_crval: | 
					
						
							|  |  |  | 	crval	clear=0x00003b07, mmuset=0x00003905, ucset=0x00001900 | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 
 | 
					
						
							|  |  |  | 	__INITDATA | 
					
						
							|  |  |  | 
 | 
					
						
							| 
									
										
										
										
											2011-06-23 17:26:56 +01:00
										 |  |  | 	@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
 | 
					
						
							|  |  |  | 	define_processor_functions xscale, dabort=v5t_early_abort, pabort=legacy_pabort, suspend=1 | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 
 | 
					
						
							|  |  |  | 	.section ".rodata" | 
					
						
							|  |  |  | 
 | 
					
						
							| 
									
										
										
										
											2011-06-23 17:26:56 +01:00
										 |  |  | 	string	cpu_arch_name, "armv5te" | 
					
						
							|  |  |  | 	string	cpu_elf_name, "v5" | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | 	string	cpu_80200_A0_A1_name, "XScale-80200 A0/A1" | 
					
						
							|  |  |  | 	string	cpu_80200_name, "XScale-80200" | 
					
						
							|  |  |  | 	string	cpu_80219_name, "XScale-80219" | 
					
						
							|  |  |  | 	string	cpu_8032x_name, "XScale-IOP8032x Family" | 
					
						
							|  |  |  | 	string	cpu_8033x_name, "XScale-IOP8033x Family" | 
					
						
							|  |  |  | 	string	cpu_pxa250_name, "XScale-PXA250" | 
					
						
							|  |  |  | 	string	cpu_pxa210_name, "XScale-PXA210" | 
					
						
							|  |  |  | 	string	cpu_ixp42x_name, "XScale-IXP42x Family" | 
					
						
							|  |  |  | 	string	cpu_ixp43x_name, "XScale-IXP43x Family" | 
					
						
							|  |  |  | 	string	cpu_ixp46x_name, "XScale-IXP46x Family" | 
					
						
							|  |  |  | 	string	cpu_ixp2400_name, "XScale-IXP2400" | 
					
						
							|  |  |  | 	string	cpu_ixp2800_name, "XScale-IXP2800" | 
					
						
							|  |  |  | 	string	cpu_pxa255_name, "XScale-PXA255" | 
					
						
							|  |  |  | 	string	cpu_pxa270_name, "XScale-PXA270" | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 
 | 
					
						
							|  |  |  | 	.align | 
					
						
							|  |  |  | 
 | 
					
						
							| 
									
										
										
										
											2005-09-20 16:35:03 +01:00
										 |  |  | 	.section ".proc.info.init", #alloc, #execinstr | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 
 | 
					
						
							| 
									
										
										
										
											2011-06-23 17:26:56 +01:00
										 |  |  | .macro xscale_proc_info name:req, cpu_val:req, cpu_mask:req, cpu_name:req, cache | 
					
						
							|  |  |  | 	.type	__\name\()_proc_info,#object | 
					
						
							|  |  |  | __\name\()_proc_info: | 
					
						
							|  |  |  | 	.long	\cpu_val | 
					
						
							|  |  |  | 	.long	\cpu_mask | 
					
						
							|  |  |  | 	.long	PMD_TYPE_SECT | \ | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 		PMD_SECT_BUFFERABLE | \ | 
					
						
							|  |  |  | 		PMD_SECT_CACHEABLE | \ | 
					
						
							|  |  |  | 		PMD_SECT_AP_WRITE | \ | 
					
						
							|  |  |  | 		PMD_SECT_AP_READ | 
					
						
							| 
									
										
										
										
											2011-06-23 17:26:56 +01:00
										 |  |  | 	.long	PMD_TYPE_SECT | \ | 
					
						
							| 
									
										
										
										
											2006-06-29 18:24:21 +01:00
										 |  |  | 		PMD_SECT_AP_WRITE | \ | 
					
						
							|  |  |  | 		PMD_SECT_AP_READ | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 	b	__xscale_setup | 
					
						
							|  |  |  | 	.long	cpu_arch_name
 | 
					
						
							|  |  |  | 	.long	cpu_elf_name
 | 
					
						
							|  |  |  | 	.long	HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP | 
					
						
							| 
									
										
										
										
											2011-06-23 17:26:56 +01:00
										 |  |  | 	.long	\cpu_name | 
					
						
							| 
									
										
										
										
											2005-04-16 15:20:36 -07:00
										 |  |  | 	.long	xscale_processor_functions
 | 
					
						
							|  |  |  | 	.long	v4wbi_tlb_fns
 | 
					
						
							|  |  |  | 	.long	xscale_mc_user_fns
 | 
					
						
							| 
									
										
										
										
											2011-06-23 17:26:56 +01:00
										 |  |  | 	.ifb \cache | 
					
						
							|  |  |  | 		.long	xscale_cache_fns
 | 
					
						
							|  |  |  | 	.else | 
					
						
							|  |  |  | 		.long	\cache | 
					
						
							|  |  |  | 	.endif | 
					
						
							|  |  |  | 	.size	__\name\()_proc_info, . - __\name\()_proc_info | 
					
						
							|  |  |  | .endm | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | 	xscale_proc_info 80200_A0_A1, 0x69052000, 0xfffffffe, cpu_80200_name, \ | 
					
						
							|  |  |  | 		cache=xscale_80200_A0_A1_cache_fns | 
					
						
							|  |  |  | 	xscale_proc_info 80200, 0x69052000, 0xfffffff0, cpu_80200_name | 
					
						
							|  |  |  | 	xscale_proc_info 80219, 0x69052e20, 0xffffffe0, cpu_80219_name | 
					
						
							|  |  |  | 	xscale_proc_info 8032x, 0x69052420, 0xfffff7e0, cpu_8032x_name | 
					
						
							|  |  |  | 	xscale_proc_info 8033x, 0x69054010, 0xfffffd30, cpu_8033x_name | 
					
						
							|  |  |  | 	xscale_proc_info pxa250, 0x69052100, 0xfffff7f0, cpu_pxa250_name | 
					
						
							|  |  |  | 	xscale_proc_info pxa210, 0x69052120, 0xfffff3f0, cpu_pxa210_name | 
					
						
							|  |  |  | 	xscale_proc_info ixp2400, 0x69054190, 0xfffffff0, cpu_ixp2400_name | 
					
						
							|  |  |  | 	xscale_proc_info ixp2800, 0x690541a0, 0xfffffff0, cpu_ixp2800_name | 
					
						
							|  |  |  | 	xscale_proc_info ixp42x, 0x690541c0, 0xffffffc0, cpu_ixp42x_name | 
					
						
							|  |  |  | 	xscale_proc_info ixp43x, 0x69054040, 0xfffffff0, cpu_ixp43x_name | 
					
						
							|  |  |  | 	xscale_proc_info ixp46x, 0x69054200, 0xffffff00, cpu_ixp46x_name | 
					
						
							|  |  |  | 	xscale_proc_info pxa255, 0x69052d00, 0xfffffff0, cpu_pxa255_name | 
					
						
							|  |  |  | 	xscale_proc_info pxa270, 0x69054110, 0xfffffff0, cpu_pxa270_name |