[ARM] nommu: add ARM940T core support
Hyok S. Choi [Tue, 26 Sep 2006 08:38:18 +0000 (17:38 +0900)]
This patch adds ARM940T core support which has 4KB D-cache, 4KB I-cache
and a MPU.

Signed-off-by: Hyok S. Choi <hyok.choi@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/Makefile
arch/arm/mm/Kconfig
arch/arm/mm/Makefile
arch/arm/mm/proc-arm940.S [new file with mode: 0644]
include/asm-arm/cacheflush.h
include/asm-arm/proc-fns.h

index a29e641..4c424c9 100644 (file)
@@ -59,6 +59,7 @@ tune-$(CONFIG_CPU_ARM7TDMI)   :=-mtune=arm7tdmi
 tune-$(CONFIG_CPU_ARM720T)     :=-mtune=arm7tdmi
 tune-$(CONFIG_CPU_ARM740T)     :=-mtune=arm7tdmi
 tune-$(CONFIG_CPU_ARM9TDMI)    :=-mtune=arm9tdmi
+tune-$(CONFIG_CPU_ARM940T)     :=-mtune=arm9tdmi
 tune-$(CONFIG_CPU_ARM920T)     :=-mtune=arm9tdmi
 tune-$(CONFIG_CPU_ARM922T)     :=-mtune=arm9tdmi
 tune-$(CONFIG_CPU_ARM925T)     :=-mtune=arm9tdmi
index ed9d32c..34d0073 100644 (file)
@@ -184,6 +184,22 @@ config CPU_ARM926T
          Say Y if you want support for the ARM926T processor.
          Otherwise, say N.
 
+# ARM940T
+config CPU_ARM940T
+       bool "Support ARM940T processor" if ARCH_INTEGRATOR
+       select CPU_32v4T
+       select CPU_ABRT_EV4T
+       select CPU_CACHE_VIVT
+       select CPU_CP15_MPU
+       help
+         ARM940T is a member of the ARM9TDMI family of general-
+         purpose microprocessors with MPU and seperate 4KB
+         instruction and 4KB data cases, each with a 4-word line
+         length.
+
+         Say Y if you want support for the ARM940T processor.
+         Otherwise, say N.
+
 # ARM1020 - needs validating
 config CPU_ARM1020
        bool "Support ARM1020T (rev 0) processor"
@@ -464,7 +480,7 @@ comment "Processor Features"
 
 config ARM_THUMB
        bool "Support Thumb user binaries"
-       depends on CPU_ARM720T || CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || CPU_XSCALE || CPU_XSC3 || CPU_V6
+       depends on CPU_ARM720T || CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM940T || CPU_ARM1020 || CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || CPU_XSCALE || CPU_XSC3 || CPU_V6
        default y
        help
          Say Y if you want to include kernel support for running user space
@@ -501,7 +517,7 @@ config CPU_DCACHE_DISABLE
 
 config CPU_DCACHE_WRITETHROUGH
        bool "Force write through D-cache"
-       depends on (CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_V6) && !CPU_DCACHE_DISABLE
+       depends on (CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM940T || CPU_ARM1020 || CPU_V6) && !CPU_DCACHE_DISABLE
        default y if CPU_ARM925T
        help
          Say Y here to use the data cache in writethrough mode. Unless you
index 053957e..f89fe1b 100644 (file)
@@ -54,6 +54,7 @@ obj-$(CONFIG_CPU_ARM920T)     += proc-arm920.o
 obj-$(CONFIG_CPU_ARM922T)      += proc-arm922.o
 obj-$(CONFIG_CPU_ARM925T)      += proc-arm925.o
 obj-$(CONFIG_CPU_ARM926T)      += proc-arm926.o
+obj-$(CONFIG_CPU_ARM940T)      += proc-arm940.o
 obj-$(CONFIG_CPU_ARM1020)      += proc-arm1020.o
 obj-$(CONFIG_CPU_ARM1020E)     += proc-arm1020e.o
 obj-$(CONFIG_CPU_ARM1022)      += proc-arm1022.o
diff --git a/arch/arm/mm/proc-arm940.S b/arch/arm/mm/proc-arm940.S
new file mode 100644 (file)
index 0000000..14846ac
--- /dev/null
@@ -0,0 +1,369 @@
+/*
+ *  linux/arch/arm/mm/arm940.S: utility functions for ARM940T
+ *
+ *  Copyright (C) 2004-2006 Hyok S. Choi (hyok.choi@samsung.com)
+ *
+ * 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.
+ *
+ */
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/assembler.h>
+#include <asm/pgtable-hwdef.h>
+#include <asm/pgtable.h>
+#include <asm/procinfo.h>
+#include <asm/ptrace.h>
+
+/* ARM940T has a 4KB DCache comprising 256 lines of 4 words */
+#define CACHE_DLINESIZE        16
+#define CACHE_DSEGMENTS        4
+#define CACHE_DENTRIES 64
+
+       .text
+/*
+ * cpu_arm940_proc_init()
+ * cpu_arm940_switch_mm()
+ *
+ * These are not required.
+ */
+ENTRY(cpu_arm940_proc_init)
+ENTRY(cpu_arm940_switch_mm)
+       mov     pc, lr
+
+/*
+ * cpu_arm940_proc_fin()
+ */
+ENTRY(cpu_arm940_proc_fin)
+       stmfd   sp!, {lr}
+       mov     ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
+       msr     cpsr_c, ip
+       bl      arm940_flush_kern_cache_all
+       mrc     p15, 0, r0, c1, c0, 0           @ ctrl register
+       bic     r0, r0, #0x00001000             @ i-cache
+       bic     r0, r0, #0x00000004             @ d-cache
+       mcr     p15, 0, r0, c1, c0, 0           @ disable caches
+       ldmfd   sp!, {pc}
+
+/*
+ * cpu_arm940_reset(loc)
+ * Params  : r0 = address to jump to
+ * Notes   : This sets up everything for a reset
+ */
+ENTRY(cpu_arm940_reset)
+       mov     ip, #0
+       mcr     p15, 0, ip, c7, c5, 0           @ flush I cache
+       mcr     p15, 0, ip, c7, c6, 0           @ flush D cache
+       mcr     p15, 0, ip, c7, c10, 4          @ drain WB
+       mrc     p15, 0, ip, c1, c0, 0           @ ctrl register
+       bic     ip, ip, #0x00000005             @ .............c.p
+       bic     ip, ip, #0x00001000             @ i-cache
+       mcr     p15, 0, ip, c1, c0, 0           @ ctrl register
+       mov     pc, r0
+
+/*
+ * cpu_arm940_do_idle()
+ */
+       .align  5
+ENTRY(cpu_arm940_do_idle)
+       mcr     p15, 0, r0, c7, c0, 4           @ Wait for interrupt
+       mov     pc, lr
+
+/*
+ *     flush_user_cache_all()
+ */
+ENTRY(arm940_flush_user_cache_all)
+       /* FALLTHROUGH */
+
+/*
+ *     flush_kern_cache_all()
+ *
+ *     Clean and invalidate the entire cache.
+ */
+ENTRY(arm940_flush_kern_cache_all)
+       mov     r2, #VM_EXEC
+       /* FALLTHROUGH */
+
+/*
+ *     flush_user_cache_range(start, end, flags)
+ *
+ *     There is no efficient way to flush a range of cache entries
+ *     in the specified address range. Thus, flushes all.
+ *
+ *     - start - start address (inclusive)
+ *     - end   - end address (exclusive)
+ *     - flags - vm_flags describing address space
+ */
+ENTRY(arm940_flush_user_cache_range)
+       mov     ip, #0
+#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
+       mcr     p15, 0, ip, c7, c6, 0           @ flush D cache
+#else
+       mov     r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments
+1:     orr     r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
+2:     mcr     p15, 0, r3, c7, c14, 2          @ clean/flush D index
+       subs    r3, r3, #1 << 26
+       bcs     2b                              @ entries 63 to 0
+       subs    r1, r1, #1 << 4
+       bcs     1b                              @ segments 3 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
+
+/*
+ *     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(arm940_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(arm940_coherent_user_range)
+       /* FALLTHROUGH */
+
+/*
+ *     flush_kern_dcache_page(void *page)
+ *
+ *     Ensure no D cache aliasing occurs, either with itself or
+ *     the I cache
+ *
+ *     - addr  - page aligned address
+ */
+ENTRY(arm940_flush_kern_dcache_page)
+       mov     ip, #0
+       mov     r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments
+1:     orr     r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
+2:     mcr     p15, 0, r3, c7, c14, 2          @ clean/flush D index
+       subs    r3, r3, #1 << 26
+       bcs     2b                              @ entries 63 to 0
+       subs    r1, r1, #1 << 4
+       bcs     1b                              @ segments 7 to 0
+       mcr     p15, 0, ip, c7, c5, 0           @ invalidate I cache
+       mcr     p15, 0, ip, c7, c10, 4          @ drain WB
+       mov     pc, lr
+
+/*
+ *     dma_inv_range(start, end)
+ *
+ *     There is no efficient way to invalidate a specifid virtual
+ *     address range. Thus, invalidates all.
+ *
+ *     - start - virtual start address
+ *     - end   - virtual end address
+ */
+ENTRY(arm940_dma_inv_range)
+       mov     ip, #0
+       mov     r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments
+1:     orr     r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
+2:     mcr     p15, 0, r3, c7, c6, 2           @ flush D entry
+       subs    r3, r3, #1 << 26
+       bcs     2b                              @ entries 63 to 0
+       subs    r1, r1, #1 << 4
+       bcs     1b                              @ segments 7 to 0
+       mcr     p15, 0, ip, c7, c10, 4          @ drain WB
+       mov     pc, lr
+
+/*
+ *     dma_clean_range(start, end)
+ *
+ *     There is no efficient way to clean a specifid virtual
+ *     address range. Thus, cleans all.
+ *
+ *     - start - virtual start address
+ *     - end   - virtual end address
+ */
+ENTRY(arm940_dma_clean_range)
+ENTRY(cpu_arm940_dcache_clean_area)
+       mov     ip, #0
+#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
+       mov     r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments
+1:     orr     r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
+2:     mcr     p15, 0, r3, c7, c10, 2          @ clean D entry
+       subs    r3, r3, #1 << 26
+       bcs     2b                              @ entries 63 to 0
+       subs    r1, r1, #1 << 4
+       bcs     1b                              @ segments 7 to 0
+#endif
+       mcr     p15, 0, ip, c7, c10, 4          @ drain WB
+       mov     pc, lr
+
+/*
+ *     dma_flush_range(start, end)
+ *
+ *     There is no efficient way to clean and invalidate a specifid
+ *     virtual address range.
+ *
+ *     - start - virtual start address
+ *     - end   - virtual end address
+ */
+ENTRY(arm940_dma_flush_range)
+       mov     ip, #0
+       mov     r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments
+1:     orr     r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
+2:
+#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
+       mcr     p15, 0, r3, c7, c14, 2          @ clean/flush D entry
+#else
+       mcr     p15, 0, r3, c7, c10, 2          @ clean D entry
+#endif
+       subs    r3, r3, #1 << 26
+       bcs     2b                              @ entries 63 to 0
+       subs    r1, r1, #1 << 4
+       bcs     1b                              @ segments 7 to 0
+       mcr     p15, 0, ip, c7, c10, 4          @ drain WB
+       mov     pc, lr
+
+ENTRY(arm940_cache_fns)
+       .long   arm940_flush_kern_cache_all
+       .long   arm940_flush_user_cache_all
+       .long   arm940_flush_user_cache_range
+       .long   arm940_coherent_kern_range
+       .long   arm940_coherent_user_range
+       .long   arm940_flush_kern_dcache_page
+       .long   arm940_dma_inv_range
+       .long   arm940_dma_clean_range
+       .long   arm940_dma_flush_range
+
+       __INIT
+
+       .type   __arm940_setup, #function
+__arm940_setup:
+       mov     r0, #0
+       mcr     p15, 0, r0, c7, c5, 0           @ invalidate I cache
+       mcr     p15, 0, r0, c7, c6, 0           @ invalidate D cache
+       mcr     p15, 0, r0, c7, c10, 4          @ drain WB
+
+       mcr     p15, 0, r0, c6, c3, 0           @ disable data area 3~7
+       mcr     p15, 0, r0, c6, c4, 0
+       mcr     p15, 0, r0, c6, c5, 0
+       mcr     p15, 0, r0, c6, c6, 0
+       mcr     p15, 0, r0, c6, c7, 0
+
+       mcr     p15, 0, r0, c6, c3, 1           @ disable instruction area 3~7
+       mcr     p15, 0, r0, c6, c4, 1
+       mcr     p15, 0, r0, c6, c5, 1
+       mcr     p15, 0, r0, c6, c6, 1
+       mcr     p15, 0, r0, c6, c7, 1
+
+       mov     r0, #0x0000003F                 @ base = 0, size = 4GB
+       mcr     p15, 0, r0, c6, c0, 0           @ set area 0, default
+       mcr     p15, 0, r0, c6, c0, 1
+
+       ldr     r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM
+       ldr     r1, =(CONFIG_DRAM_SIZE >> 12)   @ size of RAM (must be >= 4KB)
+       mov     r2, #10                         @ 11 is the minimum (4KB)
+1:     add     r2, r2, #1                      @ area size *= 2
+       mov     r1, r1, lsr #1
+       bne     1b                              @ count not zero r-shift
+       orr     r0, r0, r2, lsl #1              @ the area register value
+       orr     r0, r0, #1                      @ set enable bit
+       mcr     p15, 0, r0, c6, c1, 0           @ set area 1, RAM
+       mcr     p15, 0, r0, c6, c1, 1
+
+       ldr     r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH
+       ldr     r1, =(CONFIG_FLASH_SIZE >> 12)  @ size of FLASH (must be >= 4KB)
+       mov     r2, #10                         @ 11 is the minimum (4KB)
+1:     add     r2, r2, #1                      @ area size *= 2
+       mov     r1, r1, lsr #1
+       bne     1b                              @ count not zero r-shift
+       orr     r0, r0, r2, lsl #1              @ the area register value
+       orr     r0, r0, #1                      @ set enable bit
+       mcr     p15, 0, r0, c6, c2, 0           @ set area 2, ROM/FLASH
+       mcr     p15, 0, r0, c6, c2, 1
+
+       mov     r0, #0x06
+       mcr     p15, 0, r0, c2, c0, 0           @ Region 1&2 cacheable
+       mcr     p15, 0, r0, c2, c0, 1
+#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
+       mov     r0, #0x00                       @ disable whole write buffer
+#else
+       mov     r0, #0x02                       @ Region 1 write bufferred
+#endif
+       mcr     p15, 0, r0, c3, c0, 0
+
+       mov     r0, #0x10000
+       sub     r0, r0, #1                      @ r0 = 0xffff
+       mcr     p15, 0, r0, c5, c0, 0           @ all read/write access
+       mcr     p15, 0, r0, c5, c0, 1
+
+       mrc     p15, 0, r0, c1, c0              @ get control register
+       orr     r0, r0, #0x00001000             @ I-cache
+       orr     r0, r0, #0x00000005             @ MPU/D-cache
+
+       mov     pc, lr
+
+       .size   __arm940_setup, . - __arm940_setup
+
+       __INITDATA
+
+/*
+ * Purpose : Function pointers used to access above functions - all calls
+ *          come through these
+ */
+       .type   arm940_processor_functions, #object
+ENTRY(arm940_processor_functions)
+       .word   v4t_early_abort
+       .word   cpu_arm940_proc_init
+       .word   cpu_arm940_proc_fin
+       .word   cpu_arm940_reset
+       .word   cpu_arm940_do_idle
+       .word   cpu_arm940_dcache_clean_area
+       .word   cpu_arm940_switch_mm
+       .word   0               @ cpu_*_set_pte
+       .size   arm940_processor_functions, . - arm940_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_arm940_name, #object
+cpu_arm940_name:
+       .ascii  "ARM940T"
+       .size   cpu_arm940_name, . - cpu_arm940_name
+
+       .align
+
+       .section ".proc.info.init", #alloc, #execinstr
+
+       .type   __arm940_proc_info,#object
+__arm940_proc_info:
+       .long   0x41009400
+       .long   0xff00fff0
+       .long   0
+       b       __arm940_setup
+       .long   cpu_arch_name
+       .long   cpu_elf_name
+       .long   HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
+       .long   cpu_arm940_name
+       .long   arm940_processor_functions
+       .long   0
+       .long   0
+       .long   arm940_cache_fns
+       .size   __arm940_proc_info, . - __arm940_proc_info
+
index 77ff6fe..b0a8603 100644 (file)
 # endif
 #endif
 
+#if defined(CONFIG_CPU_ARM940T)
+# ifdef _CACHE
+#  define MULTI_CACHE 1
+# else
+#  define _CACHE arm940
+# endif
+#endif
+
 #if defined(CONFIG_CPU_SA110) || defined(CONFIG_CPU_SA1100)
 # ifdef _CACHE
 #  define MULTI_CACHE 1
index 7bb9dab..87f3ea9 100644 (file)
 #   define CPU_NAME cpu_arm926
 #  endif
 # endif
+# ifdef CONFIG_CPU_ARM940T
+#  ifdef CPU_NAME
+#   undef  MULTI_CPU
+#   define MULTI_CPU
+#  else
+#   define CPU_NAME cpu_arm940
+#  endif
+# endif
 # ifdef CONFIG_CPU_SA110
 #  ifdef CPU_NAME
 #   undef  MULTI_CPU