1 files changed, 562 insertions, 0 deletions

diff --git a/arch/arm/mm/proc-arm925.S b/arch/arm/mm/proc-arm925.S
new file mode 100644
index 000000000000..ee49aa2ca781
--- /dev/null
+++ b/arch/arm/mm/proc-arm925.S
@@ -0,0 +1,562 @@
+/*
+ *  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>
+ *
+ * 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/config.h>
+#include <linux/init.h>
+#include <asm/assembler.h>
+#include <asm/pgtable.h>
+#include <asm/procinfo.h>
+#include <asm/hardware.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 maintainence instructions.
+ */
+#define CACHE_DLIMIT    8192
+
+        .text
+/*
+ * cpu_arm925_proc_init()
+ */
+ENTRY(cpu_arm925_proc_init)
+        mov     pc, lr
+
+/*
+ * cpu_arm925_proc_fin()
+ */
+ENTRY(cpu_arm925_proc_fin)
+        stmfd   sp!, {lr}
+        mov     ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
+        msr     cpsr_c, ip
+        bl      arm925_flush_kern_cache_all
+        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
+        ldmfd   sp!, {pc}
+
+/*
+ * 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
+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]
+
+        mov     ip, #0
+        mcr     p15, 0, ip, c7, c7, 0           @ invalidate I,D caches
+        mcr     p15, 0, ip, c7, c10, 4          @ drain WB
+        mcr     p15, 0, ip, c8, c7, 0           @ invalidate I & D TLBs
+        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
+        mov     pc, 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
+        mov     pc, lr
+
+/*
+ *      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
+        mov     pc, 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
+        mov     pc, 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     pc, lr
+
+/*
+ *      flush_kern_dcache_page(void *page)
+ *
+ *      Ensure no D cache aliasing occurs, either with itself or
+ *      the I cache
+ *
+ *      - addr  - page aligned address
+ */
+ENTRY(arm925_flush_kern_dcache_page)
+        add     r1, r0, #PAGE_SZ
+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
+        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
+ *
+ * (same as v4wb)
+ */
+ENTRY(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
+        mov     pc, lr
+
+/*
+ *      dma_clean_range(start, end)
+ *
+ *      Clean the specified virtual address range.
+ *
+ *      - start - virtual start address
+ *      - end   - virtual end address
+ *
+ * (same as v4wb)
+ */
+ENTRY(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
+        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(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, c10, 1          @ clean D entry
+#endif
+        add     r0, r0, #CACHE_DLINESIZE
+        cmp     r0, r1
+        blo     1b
+        mcr     p15, 0, r0, c7, c10, 4          @ drain WB
+        mov     pc, lr
+
+ENTRY(arm925_cache_fns)
+        .long   arm925_flush_kern_cache_all
+        .long   arm925_flush_user_cache_all
+        .long   arm925_flush_user_cache_range
+        .long   arm925_coherent_kern_range
+        .long   arm925_coherent_user_range
+        .long   arm925_flush_kern_dcache_page
+        .long   arm925_dma_inv_range
+        .long   arm925_dma_clean_range
+        .long   arm925_dma_flush_range
+
+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
+        mov     pc, 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)
+        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
+        mov     pc, lr
+
+/*
+ * cpu_arm925_set_pte(ptep, pte)
+ *
+ * Set a PTE and flush it out
+ */
+        .align  5
+ENTRY(cpu_arm925_set_pte)
+        str     r1, [r0], #-2048                @ linux version
+
+        eor     r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
+
+        bic     r2, r1, #PTE_SMALL_AP_MASK
+        bic     r2, r2, #PTE_TYPE_MASK
+        orr     r2, r2, #PTE_TYPE_SMALL
+
+        tst     r1, #L_PTE_USER                 @ User?
+        orrne   r2, r2, #PTE_SMALL_AP_URO_SRW
+
+        tst     r1, #L_PTE_WRITE | L_PTE_DIRTY  @ Write and Dirty?
+        orreq   r2, r2, #PTE_SMALL_AP_UNO_SRW
+
+        tst     r1, #L_PTE_PRESENT | L_PTE_YOUNG        @ Present and Young?
+        movne   r2, #0
+
+#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
+        eor     r3, r2, #0x0a                   @ C & small page?
+        tst     r3, #0x0b
+        biceq   r2, r2, #4
+#endif
+        str     r2, [r0]                        @ hardware version
+        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
+        mov     pc, lr
+
+        __INIT
+
+        .type   __arm925_setup, #function
+__arm925_setup:
+        mov     r0, #0
+#if defined(CONFIG_CPU_ICACHE_STREAMING_DISABLE)
+        orr     r0,r0,#1 << 7
+#endif
+
+        /* 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
+        mcr     p15, 0, r0, c8, c7              @ invalidate I,D TLBs on v4
+
+#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
+        mov     r0, #4                          @ disable write-back on caches explicitly
+        mcr     p15, 7, r0, c15, c0, 0
+#endif
+
+        mrc     p15, 0, r0, c1, c0              @ get control register v4
+        ldr     r5, arm925_cr1_clear
+        bic     r0, r0, r5
+        ldr     r5, arm925_cr1_set
+        orr     r0, r0, r5
+#ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
+        orr     r0, r0, #0x4000                 @ .1.. .... .... ....
+#endif
+        mov     pc, lr
+        .size   __arm925_setup, . - __arm925_setup
+
+        /*
+         *  R
+         * .RVI ZFRS BLDP WCAM
+         * .011 0001 ..11 1101
+         * 
+         */
+        .type   arm925_cr1_clear, #object
+        .type   arm925_cr1_set, #object
+arm925_cr1_clear:
+        .word   0x7f3f
+arm925_cr1_set:
+        .word   0x313d
+
+        __INITDATA
+
+/*
+ * Purpose : Function pointers used to access above functions - all calls
+ *           come through these
+ */
+        .type   arm925_processor_functions, #object
+arm925_processor_functions:
+        .word   v4t_early_abort
+        .word   cpu_arm925_proc_init
+        .word   cpu_arm925_proc_fin
+        .word   cpu_arm925_reset
+        .word   cpu_arm925_do_idle
+        .word   cpu_arm925_dcache_clean_area
+        .word   cpu_arm925_switch_mm
+        .word   cpu_arm925_set_pte
+        .size   arm925_processor_functions, . - arm925_processor_functions
+
+        .section ".rodata"
+
+        .type   cpu_arch_name, #object
+cpu_arch_name:
+        .asciz  "armv4t"
+        .size   cpu_arch_name, . - cpu_arch_name
+
+        .type   cpu_elf_name, #object
+cpu_elf_name:
+        .asciz  "v4"
+        .size   cpu_elf_name, . - cpu_elf_name
+
+        .type   cpu_arm925_name, #object
+cpu_arm925_name:
+        .ascii  "ARM925T"
+#ifndef CONFIG_CPU_ICACHE_DISABLE
+        .ascii  "i"
+#endif
+#ifndef CONFIG_CPU_DCACHE_DISABLE
+        .ascii  "d"
+#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
+        .ascii  "(wt)"
+#else
+        .ascii  "(wb)"
+#endif
+#ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
+        .ascii  "RR"
+#endif
+#endif
+        .ascii  "\0"
+        .size   cpu_arm925_name, . - cpu_arm925_name
+
+        .align
+
+        .section ".proc.info", #alloc, #execinstr
+
+        .type   __arm925_proc_info,#object
+__arm925_proc_info:
+        .long   0x54029250
+        .long   0xfffffff0
+        .long   PMD_TYPE_SECT | \
+                PMD_BIT4 | \
+                PMD_SECT_AP_WRITE | \
+                PMD_SECT_AP_READ
+        b       __arm925_setup
+        .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   __arm925_proc_info, . - __arm925_proc_info
+
+        .type   __arm915_proc_info,#object
+__arm915_proc_info:
+        .long   0x54029150
+        .long   0xfffffff0
+        .long   PMD_TYPE_SECT | \
+                PMD_BIT4 | \
+                PMD_SECT_AP_WRITE | \
+                PMD_SECT_AP_READ
+        b       __arm925_setup
+        .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   __arm925_proc_info, . - __arm925_proc_info