arch/arm/boot/compressed/head-xscale.S

   1 /*
   2  * linux/arch/arm/boot/compressed/head-xscale.S
   3  *
   4  * XScale specific tweaks.  This is merged into head.S by the linker.
   5  *
   6  */
   7
   8 #include <linux/config.h>
   9 #include <linux/linkage.h>
  10 #include <asm/mach-types.h>
  11
  12                 .section        ".start", "ax"
  13
  14 __XScale_start:
  15
  16                 @ Preserve r8/r7 i.e. kernel entry values
  17
  18                 @ Data cache might be active.
  19                 @ Be sure to flush kernel binary out of the cache,
  20                 @ whatever state it is, before it is turned off.
  21                 @ This is done by fetching through currently executed
  22                 @ memory to be sure we hit the same cache.
  23                 bic     r2, pc, #0x1f
  24                 add     r3, r2, #0x10000        @ 64 kb is quite enough...
  25 1:              ldr     r0, [r2], #32
  26                 teq     r2, r3
  27                 bne     1b
  28                 mcr     p15, 0, r0, c7, c10, 4  @ drain WB
  29                 mcr     p15, 0, r0, c7, c7, 0   @ flush I & D caches
  30
  31                 @ disabling MMU and caches
  32                 mrc     p15, 0, r0, c1, c0, 0   @ read control reg
  33                 bic     r0, r0, #0x05           @ clear DC, MMU
  34                 bic     r0, r0, #0x1000         @ clear Icache
  35                 mcr     p15, 0, r0, c1, c0, 0
  36
  37 #ifdef  CONFIG_ARCH_IQ80321
  38                 mov     r7, #MACH_TYPE_IQ80321
  39 #endif
  40
  41 #ifdef  CONFIG_ARCH_IQ31244
  42                 mov     r7, #(MACH_TYPE_IQ31244 & 0xff)
  43                 orr     r7, r7, #(MACH_TYPE_IQ31244 & 0xff00)
  44 #endif
  45
  46 #ifdef  CONFIG_ARCH_IQ80331
  47                 mov     r7, #(MACH_TYPE_IQ80331 & 0xff)
  48                 orr     r7, r7, #(MACH_TYPE_IQ80331 & 0xff00)
  49 #endif
  50
  51 #ifdef CONFIG_ARCH_LUBBOCK
  52                 mov     r7, #MACH_TYPE_LUBBOCK
  53 #endif
  54
  55 #ifdef CONFIG_ARCH_COTULLA_IDP
  56                 mov     r7, #MACH_TYPE_COTULLA_IDP
  57 #endif
  58
  59 #ifdef CONFIG_ARCH_IQ80310
  60                 /*
  61                  * Crank the CPU up to 733MHz
  62                  */
  63                 mov     r1, #9
  64                 mcr     p14, 0, r1, c6, c0, 0
  65
  66                 /*
  67                  * Disable ECC error notification
  68                  * At some point, we should add an ECC handler to Linux
  69                  */
  70                 mov     r1, #0x1500
  71                 mov     r0, #0x4
  72                 str     r0, [r1, #0x34]
  73
  74                 mov     r7, #MACH_TYPE_IQ80310
  75 #endif
  76
  77 #ifdef CONFIG_ARCH_IXDP425
  78                 mov     r7, #MACH_TYPE_IXDP425
  79 #endif
  80
  81 #ifdef CONFIG_ARCH_PRPMC1100
  82                 mov     r7, #(MACH_TYPE_PRPMC1100 & 0xff)
  83                 orr     r7, r7, #(MACH_TYPE_PRPMC1100 & 0xff00)
  84 #endif
  85
  86 #ifdef CONFIG_ARCH_ADI_COYOTE
  87                 # Set machine ID into r7 (Coyote ID > 255 hence needs
  88                 # two instructions to build the ID safely).
  89                 mov r7, #MACH_TYPE_ADI_COYOTE & 0xff
  90                 orr r7, r7, #MACH_TYPE_ADI_COYOTE & 0xff00
  91 #endif
  92
  93 #ifdef CONFIG_ARCH_SE4000
  94                 mov r7, #MACH_TYPE_SE4000 & 0xff
  95                 orr r7, r7, #MACH_TYPE_SE4000 & 0xff00
  96 #endif