drivers/scsi/arm/acornscsi-io.S

   1 /*
   2  *  linux/drivers/acorn/scsi/acornscsi-io.S: Acorn SCSI card IO
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8 #include <linux/linkage.h>
   9
  10 #include <asm/assembler.h>
  11 #include <asm/hardware.h>
  12
  13 #if defined(__APCS_32__)
  14 #define LOADREGS(t,r,l...)      ldm##t  r, l
  15 #elif defined(__APCS_26__)
  16 #define LOADREGS(t,r,l...)      ldm##t  r, l##^
  17 #endif
  18
  19 @ Purpose: transfer a block of data from the acorn scsi card to memory
  20 @ Proto  : void acornscsi_in(unsigned int addr_start, char *buffer, int length)
  21 @ Returns: nothing
  22
  23                 .align
  24 ENTRY(__acornscsi_in)
  25                 stmfd   sp!, {r4 - r7, lr}
  26                 bic     r0, r0, #3
  27                 mov     lr, #0xff
  28                 orr     lr, lr, #0xff00
  29 acornscsi_in16lp:
  30                 subs    r2, r2, #16
  31                 bmi     acornscsi_in8
  32                 ldmia   r0!, {r3, r4, r5, r6}
  33                 and     r3, r3, lr
  34                 orr     r3, r3, r4, lsl #16
  35                 and     r4, r5, lr
  36                 orr     r4, r4, r6, lsl #16
  37                 ldmia   r0!, {r5, r6, r7, ip}
  38                 and     r5, r5, lr
  39                 orr     r5, r5, r6, lsl #16
  40                 and     r6, r7, lr
  41                 orr     r6, r6, ip, lsl #16
  42                 stmia   r1!, {r3 - r6}
  43                 bne     acornscsi_in16lp
  44                 LOADREGS(fd, sp!, {r4 - r7, pc})
  45
  46 acornscsi_in8:  adds    r2, r2, #8
  47                 bmi     acornscsi_in4
  48                 ldmia   r0!, {r3, r4, r5, r6}
  49                 and     r3, r3, lr
  50                 orr     r3, r3, r4, lsl #16
  51                 and     r4, r5, lr
  52                 orr     r4, r4, r6, lsl #16
  53                 stmia   r1!, {r3 - r4}
  54                 LOADREGS(eqfd, sp!, {r4 - r7, pc})
  55                 sub     r2, r2, #8
  56
  57 acornscsi_in4:  adds    r2, r2, #4
  58                 bmi     acornscsi_in2
  59                 ldmia   r0!, {r3, r4}
  60                 and     r3, r3, lr
  61                 orr     r3, r3, r4, lsl #16
  62                 str     r3, [r1], #4
  63                 LOADREGS(eqfd, sp!, {r4 - r7, pc})
  64                 sub     r2, r2, #4
  65
  66 acornscsi_in2:  adds    r2, r2, #2
  67                 ldr     r3, [r0], #4
  68                 and     r3, r3, lr
  69                 strb    r3, [r1], #1
  70                 mov     r3, r3, lsr #8
  71                 strplb  r3, [r1], #1
  72                 LOADREGS(fd, sp!, {r4 - r7, pc})
  73
  74 @ Purpose: transfer a block of data from memory to the acorn scsi card
  75 @ Proto  : void acornscsi_in(unsigned int addr_start, char *buffer, int length)
  76 @ Returns: nothing
  77
  78 ENTRY(__acornscsi_out)
  79                 stmfd   sp!, {r4 - r6, lr}
  80                 bic     r0, r0, #3
  81 acornscsi_out16lp:
  82                 subs    r2, r2, #16
  83                 bmi     acornscsi_out8
  84                 ldmia   r1!, {r4, r6, ip, lr}
  85                 mov     r3, r4, lsl #16
  86                 orr     r3, r3, r3, lsr #16
  87                 mov     r4, r4, lsr #16
  88                 orr     r4, r4, r4, lsl #16
  89                 mov     r5, r6, lsl #16
  90                 orr     r5, r5, r5, lsr #16
  91                 mov     r6, r6, lsr #16
  92                 orr     r6, r6, r6, lsl #16
  93                 stmia   r0!, {r3, r4, r5, r6}
  94                 mov     r3, ip, lsl #16
  95                 orr     r3, r3, r3, lsr #16
  96                 mov     r4, ip, lsr #16
  97                 orr     r4, r4, r4, lsl #16
  98                 mov     ip, lr, lsl #16
  99                 orr     ip, ip, ip, lsr #16
 100                 mov     lr, lr, lsr #16
 101                 orr     lr, lr, lr, lsl #16
 102                 stmia   r0!, {r3, r4, ip, lr}
 103                 bne     acornscsi_out16lp
 104                 LOADREGS(fd, sp!, {r4 - r6, pc})
 105
 106 acornscsi_out8: adds    r2, r2, #8
 107                 bmi     acornscsi_out4
 108                 ldmia   r1!, {r4, r6}
 109                 mov     r3, r4, lsl #16
 110                 orr     r3, r3, r3, lsr #16
 111                 mov     r4, r4, lsr #16
 112                 orr     r4, r4, r4, lsl #16
 113                 mov     r5, r6, lsl #16
 114                 orr     r5, r5, r5, lsr #16
 115                 mov     r6, r6, lsr #16
 116                 orr     r6, r6, r6, lsl #16
 117                 stmia   r0!, {r3, r4, r5, r6}
 118                 LOADREGS(eqfd, sp!, {r4 - r6, pc})
 119
 120                 sub     r2, r2, #8
 121 acornscsi_out4: adds    r2, r2, #4
 122                 bmi     acornscsi_out2
 123                 ldr     r4, [r1], #4
 124                 mov     r3, r4, lsl #16
 125                 orr     r3, r3, r3, lsr #16
 126                 mov     r4, r4, lsr #16
 127                 orr     r4, r4, r4, lsl #16
 128                 stmia   r0!, {r3, r4}
 129                 LOADREGS(eqfd, sp!, {r4 - r6, pc})
 130
 131                 sub     r2, r2, #4
 132 acornscsi_out2: adds    r2, r2, #2
 133                 ldr     r3, [r1], #2
 134                 strb    r3, [r0], #1
 135                 mov     r3, r3, lsr #8
 136                 strplb  r3, [r0], #1
 137                 LOADREGS(fd, sp!, {r4 - r6, pc})
 138