Initial import

1 files changed, 523 insertions, 0 deletions

diff --git a/arch/arm/mm/proc-arm925.S b/arch/arm/mm/proc-arm925.S
new file mode 100644
index 000000000..32a47cc19
--- /dev/null
+++ b/arch/arm/mm/proc-arm925.S
@@ -0,0 +1,523 @@
+/*
+ *  linux/arch/arm/mm/arm925.S: MMU functions for ARM925
+ *
+ *  Copyright (C) 1999,2000 ARM Limited
+ *  Copyright (C) 2000 Deep Blue Solutions Ltd.
+ *  Copyright (C) 2002 RidgeRun, Inc.
+ *  Copyright (C) 2002-2003 MontaVista Software, Inc.
+ *
+ *  Update for Linux-2.6 and cache flush improvements
+ *  Copyright (C) 2004 Nokia Corporation by Tony Lindgren <tony@atomide.com>
+ *
+ *  hacked for non-paged-MM by Hyok S. Choi, 2004.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ *
+ * These are the low level assembler for performing cache and TLB
+ * functions on the arm925.
+ *
+ *  CONFIG_CPU_ARM925_CPU_IDLE -> nohlt
+ *
+ * Some additional notes based on deciphering the TI TRM on OMAP-5910:
+ *
+ * NOTE1: The TI925T Configuration Register bit "D-cache clean and flush
+ *	  entry mode" must be 0 to flush the entries in both segments
+ *	  at once. This is the default value. See TRM 2-20 and 2-24 for
+ *	  more information.
+ *
+ * NOTE2: Default is the "D-cache clean and flush entry mode". It looks
+ *	  like the "Transparent mode" must be on for partial cache flushes
+ *	  to work in this mode. This mode only works with 16-bit external
+ *	  memory. See TRM 2-24 for more information.
+ *
+ * NOTE3: Write-back cache flushing seems to be flakey with devices using
+ *        direct memory access, such as USB OHCI. The workaround is to use
+ *        write-through cache with CONFIG_CPU_DCACHE_WRITETHROUGH (this is
+ *        the default for OMAP-1510).
+ */
+
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/assembler.h>
+#include <asm/hwcap.h>
+#include <asm/pgtable-hwdef.h>
+#include <asm/pgtable.h>
+#include <asm/page.h>
+#include <asm/ptrace.h>
+#include "proc-macros.S"
+
+/*
+ * The size of one data cache line.
+ */
+#define CACHE_DLINESIZE	16
+
+/*
+ * The number of data cache segments.
+ */
+#define CACHE_DSEGMENTS	2
+
+/*
+ * The number of lines in a cache segment.
+ */
+#define CACHE_DENTRIES	256
+
+/*
+ * This is the size at which it becomes more efficient to
+ * clean the whole cache, rather than using the individual
+ * cache line maintenance instructions.
+ */
+#define CACHE_DLIMIT	8192
+
+	.text
+/*
+ * cpu_arm925_proc_init()
+ */
+ENTRY(cpu_arm925_proc_init)
+	ret	lr
+
+/*
+ * cpu_arm925_proc_fin()
+ */
+ENTRY(cpu_arm925_proc_fin)
+	mrc	p15, 0, r0, c1, c0, 0		@ ctrl register
+	bic	r0, r0, #0x1000			@ ...i............
+	bic	r0, r0, #0x000e			@ ............wca.
+	mcr	p15, 0, r0, c1, c0, 0		@ disable caches
+	ret	lr
+
+/*
+ * cpu_arm925_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
+ */
+	.align	5
+	.pushsection	.idmap.text, "ax"
+ENTRY(cpu_arm925_reset)
+	/* Send software reset to MPU and DSP */
+	mov	ip, #0xff000000
+	orr	ip, ip, #0x00fe0000
+	orr	ip, ip, #0x0000ce00
+	mov	r4, #1
+	strh	r4, [ip, #0x10]
+ENDPROC(cpu_arm925_reset)
+	.popsection
+
+	mov	ip, #0
+	mcr	p15, 0, ip, c7, c7, 0		@ invalidate I,D caches
+	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
+#ifdef CONFIG_MMU
+	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
+#endif
+	mrc	p15, 0, ip, c1, c0, 0		@ ctrl register
+	bic	ip, ip, #0x000f			@ ............wcam
+	bic	ip, ip, #0x1100			@ ...i...s........
+	mcr	p15, 0, ip, c1, c0, 0		@ ctrl register
+	ret	r0
+
+/*
+ * cpu_arm925_do_idle()
+ *
+ * Called with IRQs disabled
+ */
+	.align	10
+ENTRY(cpu_arm925_do_idle)
+	mov	r0, #0
+	mrc	p15, 0, r1, c1, c0, 0		@ Read control register
+	mcr	p15, 0, r0, c7, c10, 4		@ Drain write buffer
+	bic	r2, r1, #1 << 12
+	mcr	p15, 0, r2, c1, c0, 0		@ Disable I cache
+	mcr	p15, 0, r0, c7, c0, 4		@ Wait for interrupt
+	mcr	p15, 0, r1, c1, c0, 0		@ Restore ICache enable
+	ret	lr
+
+/*
+ *	flush_icache_all()
+ *
+ *	Unconditionally clean and invalidate the entire icache.
+ */
+ENTRY(arm925_flush_icache_all)
+	mov	r0, #0
+	mcr	p15, 0, r0, c7, c5, 0		@ invalidate I cache
+	ret	lr
+ENDPROC(arm925_flush_icache_all)
+
+/*
+ *	flush_user_cache_all()
+ *
+ *	Clean and invalidate all cache entries in a particular
+ *	address space.
+ */
+ENTRY(arm925_flush_user_cache_all)
+	/* FALLTHROUGH */
+
+/*
+ *	flush_kern_cache_all()
+ *
+ *	Clean and invalidate the entire cache.
+ */
+ENTRY(arm925_flush_kern_cache_all)
+	mov	r2, #VM_EXEC
+	mov	ip, #0
+__flush_whole_cache:
+#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
+	mcr	p15, 0, ip, c7, c6, 0		@ invalidate D cache
+#else
+	/* Flush entries in both segments at once, see NOTE1 above */
+	mov	r3, #(CACHE_DENTRIES - 1) << 4	@ 256 entries in segment
+2:	mcr	p15, 0, r3, c7, c14, 2		@ clean+invalidate D index
+	subs	r3, r3, #1 << 4
+	bcs	2b				@ entries 255 to 0
+#endif
+	tst	r2, #VM_EXEC
+	mcrne	p15, 0, ip, c7, c5, 0		@ invalidate I cache
+	mcrne	p15, 0, ip, c7, c10, 4		@ drain WB
+	ret	lr
+
+/*
+ *	flush_user_cache_range(start, end, flags)
+ *
+ *	Clean and invalidate a range of cache entries in the
+ *	specified address range.
+ *
+ *	- start	- start address (inclusive)
+ *	- end	- end address (exclusive)
+ *	- flags	- vm_flags describing address space
+ */
+ENTRY(arm925_flush_user_cache_range)
+	mov	ip, #0
+	sub	r3, r1, r0			@ calculate total size
+	cmp	r3, #CACHE_DLIMIT
+	bgt	__flush_whole_cache
+1:	tst	r2, #VM_EXEC
+#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
+	mcr	p15, 0, r0, c7, c6, 1		@ invalidate D entry
+	mcrne	p15, 0, r0, c7, c5, 1		@ invalidate I entry
+	add	r0, r0, #CACHE_DLINESIZE
+	mcr	p15, 0, r0, c7, c6, 1		@ invalidate D entry
+	mcrne	p15, 0, r0, c7, c5, 1		@ invalidate I entry
+	add	r0, r0, #CACHE_DLINESIZE
+#else
+	mcr	p15, 0, r0, c7, c14, 1		@ clean and invalidate D entry
+	mcrne	p15, 0, r0, c7, c5, 1		@ invalidate I entry
+	add	r0, r0, #CACHE_DLINESIZE
+	mcr	p15, 0, r0, c7, c14, 1		@ clean and invalidate D entry
+	mcrne	p15, 0, r0, c7, c5, 1		@ invalidate I entry
+	add	r0, r0, #CACHE_DLINESIZE
+#endif
+	cmp	r0, r1
+	blo	1b
+	tst	r2, #VM_EXEC
+	mcrne	p15, 0, ip, c7, c10, 4		@ drain WB
+	ret	lr
+
+/*
+ *	coherent_kern_range(start, end)
+ *
+ *	Ensure coherency between the Icache and the Dcache in the
+ *	region described by start, end.  If you have non-snooping
+ *	Harvard caches, you need to implement this function.
+ *
+ *	- start	- virtual start address
+ *	- end	- virtual end address
+ */
+ENTRY(arm925_coherent_kern_range)
+	/* FALLTHROUGH */
+
+/*
+ *	coherent_user_range(start, end)
+ *
+ *	Ensure coherency between the Icache and the Dcache in the
+ *	region described by start, end.  If you have non-snooping
+ *	Harvard caches, you need to implement this function.
+ *
+ *	- start	- virtual start address
+ *	- end	- virtual end address
+ */
+ENTRY(arm925_coherent_user_range)
+	bic	r0, r0, #CACHE_DLINESIZE - 1
+1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
+	mcr	p15, 0, r0, c7, c5, 1		@ invalidate I entry
+	add	r0, r0, #CACHE_DLINESIZE
+	cmp	r0, r1
+	blo	1b
+	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
+	mov	r0, #0
+	ret	lr
+
+/*
+ *	flush_kern_dcache_area(void *addr, size_t size)
+ *
+ *	Ensure no D cache aliasing occurs, either with itself or
+ *	the I cache
+ *
+ *	- addr	- kernel address
+ *	- size	- region size
+ */
+ENTRY(arm925_flush_kern_dcache_area)
+	add	r1, r0, r1
+1:	mcr	p15, 0, r0, c7, c14, 1		@ clean+invalidate D entry
+	add	r0, r0, #CACHE_DLINESIZE
+	cmp	r0, r1
+	blo	1b
+	mov	r0, #0
+	mcr	p15, 0, r0, c7, c5, 0		@ invalidate I cache
+	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
+	ret	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
+ *
+ * (same as v4wb)
+ */
+arm925_dma_inv_range:
+#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
+	tst	r0, #CACHE_DLINESIZE - 1
+	mcrne	p15, 0, r0, c7, c10, 1		@ clean D entry
+	tst	r1, #CACHE_DLINESIZE - 1
+	mcrne	p15, 0, r1, c7, c10, 1		@ clean D entry
+#endif
+	bic	r0, r0, #CACHE_DLINESIZE - 1
+1:	mcr	p15, 0, r0, c7, c6, 1		@ invalidate D entry
+	add	r0, r0, #CACHE_DLINESIZE
+	cmp	r0, r1
+	blo	1b
+	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
+	ret	lr
+
+/*
+ *	dma_clean_range(start, end)
+ *
+ *	Clean the specified virtual address range.
+ *
+ *	- start	- virtual start address
+ *	- end	- virtual end address
+ *
+ * (same as v4wb)
+ */
+arm925_dma_clean_range:
+#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
+	bic	r0, r0, #CACHE_DLINESIZE - 1
+1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
+	add	r0, r0, #CACHE_DLINESIZE
+	cmp	r0, r1
+	blo	1b
+#endif
+	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
+	ret	lr
+
+/*
+ *	dma_flush_range(start, end)
+ *
+ *	Clean and invalidate the specified virtual address range.
+ *
+ *	- start	- virtual start address
+ *	- end	- virtual end address
+ */
+ENTRY(arm925_dma_flush_range)
+	bic	r0, r0, #CACHE_DLINESIZE - 1
+1:
+#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
+	mcr	p15, 0, r0, c7, c14, 1		@ clean+invalidate D entry
+#else
+	mcr	p15, 0, r0, c7, c6, 1		@ invalidate D entry
+#endif
+	add	r0, r0, #CACHE_DLINESIZE
+	cmp	r0, r1
+	blo	1b
+	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
+	ret	lr
+
+/*
+ *	dma_map_area(start, size, dir)
+ *	- start	- kernel virtual start address
+ *	- size	- size of region
+ *	- dir	- DMA direction
+ */
+ENTRY(arm925_dma_map_area)
+	add	r1, r1, r0
+	cmp	r2, #DMA_TO_DEVICE
+	beq	arm925_dma_clean_range
+	bcs	arm925_dma_inv_range
+	b	arm925_dma_flush_range
+ENDPROC(arm925_dma_map_area)
+
+/*
+ *	dma_unmap_area(start, size, dir)
+ *	- start	- kernel virtual start address
+ *	- size	- size of region
+ *	- dir	- DMA direction
+ */
+ENTRY(arm925_dma_unmap_area)
+	ret	lr
+ENDPROC(arm925_dma_unmap_area)
+
+	.globl	arm925_flush_kern_cache_louis
+	.equ	arm925_flush_kern_cache_louis, arm925_flush_kern_cache_all
+
+	@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
+	define_cache_functions arm925
+
+ENTRY(cpu_arm925_dcache_clean_area)
+#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
+1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
+	add	r0, r0, #CACHE_DLINESIZE
+	subs	r1, r1, #CACHE_DLINESIZE
+	bhi	1b
+#endif
+	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
+	ret	lr
+
+/* =============================== PageTable ============================== */
+
+/*
+ * cpu_arm925_switch_mm(pgd)
+ *
+ * Set the translation base pointer to be as described by pgd.
+ *
+ * pgd: new page tables
+ */
+	.align	5
+ENTRY(cpu_arm925_switch_mm)
+#ifdef CONFIG_MMU
+	mov	ip, #0
+#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
+	mcr	p15, 0, ip, c7, c6, 0		@ invalidate D cache
+#else
+	/* Flush entries in bothe segments at once, see NOTE1 above */
+	mov	r3, #(CACHE_DENTRIES - 1) << 4	@ 256 entries in segment
+2:	mcr	p15, 0, r3, c7, c14, 2		@ clean & invalidate D index
+	subs	r3, r3, #1 << 4
+	bcs	2b				@ entries 255 to 0
+#endif
+	mcr	p15, 0, ip, c7, c5, 0		@ invalidate I cache
+	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
+	mcr	p15, 0, r0, c2, c0, 0		@ load page table pointer
+	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
+#endif
+	ret	lr
+
+/*
+ * cpu_arm925_set_pte_ext(ptep, pte, ext)
+ *
+ * Set a PTE and flush it out
+ */
+	.align	5
+ENTRY(cpu_arm925_set_pte_ext)
+#ifdef CONFIG_MMU
+	armv3_set_pte_ext
+	mov	r0, r0
+#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
+	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
+#endif
+	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
+#endif /* CONFIG_MMU */
+	ret	lr
+
+	.type	__arm925_setup, #function
+__arm925_setup:
+	mov	r0, #0
+
+	/* Transparent on, D-cache clean & flush mode. See  NOTE2 above */
+        orr     r0,r0,#1 << 1			@ transparent mode on
+        mcr     p15, 0, r0, c15, c1, 0          @ write TI config register
+
+	mov	r0, #0
+	mcr	p15, 0, r0, c7, c7		@ invalidate I,D caches on v4
+	mcr	p15, 0, r0, c7, c10, 4		@ drain write buffer on v4
+#ifdef CONFIG_MMU
+	mcr	p15, 0, r0, c8, c7		@ invalidate I,D TLBs on v4
+#endif
+
+#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
+	mov	r0, #4				@ disable write-back on caches explicitly
+	mcr	p15, 7, r0, c15, c0, 0
+#endif
+
+	adr	r5, arm925_crval
+	ldmia	r5, {r5, r6}
+	mrc	p15, 0, r0, c1, c0		@ get control register v4
+	bic	r0, r0, r5
+	orr	r0, r0, r6
+#ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
+	orr	r0, r0, #0x4000			@ .1.. .... .... ....
+#endif
+	ret	lr
+	.size	__arm925_setup, . - __arm925_setup
+
+	/*
+	 *  R
+	 * .RVI ZFRS BLDP WCAM
+	 * .011 0001 ..11 1101
+	 * 
+	 */
+	.type	arm925_crval, #object
+arm925_crval:
+	crval	clear=0x00007f3f, mmuset=0x0000313d, ucset=0x00001130
+
+	__INITDATA
+	@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
+	define_processor_functions arm925, dabort=v4t_early_abort, pabort=legacy_pabort
+
+	.section ".rodata"
+
+	string	cpu_arch_name, "armv4t"
+	string	cpu_elf_name, "v4"
+	string	cpu_arm925_name, "ARM925T"
+
+	.align
+
+	.section ".proc.info.init", #alloc
+
+.macro arm925_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 | \
+		PMD_SECT_CACHEABLE | \
+		PMD_BIT4 | \
+		PMD_SECT_AP_WRITE | \
+		PMD_SECT_AP_READ
+	.long   PMD_TYPE_SECT | \
+		PMD_BIT4 | \
+		PMD_SECT_AP_WRITE | \
+		PMD_SECT_AP_READ
+	initfn	__arm925_setup, __\name\()_proc_info
+	.long	cpu_arch_name
+	.long	cpu_elf_name
+	.long	HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
+	.long	cpu_arm925_name
+	.long	arm925_processor_functions
+	.long	v4wbi_tlb_fns
+	.long	v4wb_user_fns
+	.long	arm925_cache_fns
+	.size	__\name\()_proc_info, . - __\name\()_proc_info
+.endm
+
+	arm925_proc_info arm925, 0x54029250, 0xfffffff0, cpu_arm925_name
+	arm925_proc_info arm915, 0x54029150, 0xfffffff0, cpu_arm925_name