sound/oss/vidc_fill.S

   1 /*
   2  *  linux/drivers/sound/vidc_fill.S
   3  *
   4  *  Copyright (C) 1997 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  Filler routines for DMA buffers
  11  */
  12 #include <linux/linkage.h>
  13 #include <asm/assembler.h>
  14 #include <asm/hardware.h>
  15 #include <asm/hardware/iomd.h>
  16
  17                 .text
  18
  19 ENTRY(vidc_fill_1x8_u)
  20                 mov     ip, #0xff00
  21 1:              cmp     r0, r1
  22                 bge     vidc_clear
  23                 ldrb    r4, [r0], #1
  24                 eor     r4, r4, #0x80
  25                 and     r4, ip, r4, lsl #8
  26                 orr     r4, r4, r4, lsl #16
  27                 str     r4, [r2], #4
  28                 cmp     r2, r3
  29                 blt     1b
  30                 mov     pc, lr
  31
  32 ENTRY(vidc_fill_2x8_u)
  33                 mov     ip, #0xff00
  34 1:              cmp     r0, r1
  35                 bge     vidc_clear
  36                 ldr     r4, [r0], #2
  37                 and     r5, r4, ip
  38                 and     r4, ip, r4, lsl #8
  39                 orr     r4, r4, r5, lsl #16
  40                 orr     r4, r4, r4, lsr #8
  41                 str     r4, [r2], #4
  42                 cmp     r2, r3
  43                 blt     1b
  44                 mov     pc, lr
  45
  46 ENTRY(vidc_fill_1x8_s)
  47                 mov     ip, #0xff00
  48 1:              cmp     r0, r1
  49                 bge     vidc_clear
  50                 ldrb    r4, [r0], #1
  51                 and     r4, ip, r4, lsl #8
  52                 orr     r4, r4, r4, lsl #16
  53                 str     r4, [r2], #4
  54                 cmp     r2, r3
  55                 blt     1b
  56                 mov     pc, lr
  57
  58 ENTRY(vidc_fill_2x8_s)
  59                 mov     ip, #0xff00
  60 1:              cmp     r0, r1
  61                 bge     vidc_clear
  62                 ldr     r4, [r0], #2
  63                 and     r5, r4, ip
  64                 and     r4, ip, r4, lsl #8
  65                 orr     r4, r4, r5, lsl #16
  66                 orr     r4, r4, r4, lsr #8
  67                 str     r4, [r2], #4
  68                 cmp     r2, r3
  69                 blt     1b
  70                 mov     pc, lr
  71
  72 ENTRY(vidc_fill_1x16_s)
  73                 mov     ip, #0xff00
  74                 orr     ip, ip, ip, lsr #8
  75 1:              cmp     r0, r1
  76                 bge     vidc_clear
  77                 ldr     r5, [r0], #2
  78                 and     r4, r5, ip
  79                 orr     r4, r4, r4, lsl #16
  80                 str     r4, [r2], #4
  81                 cmp     r0, r1
  82                 addlt   r0, r0, #2
  83                 andlt   r4, r5, ip, lsl #16
  84                 orrlt   r4, r4, r4, lsr #16
  85                 strlt   r4, [r2], #4
  86                 cmp     r2, r3
  87                 blt     1b
  88                 mov     pc, lr
  89
  90 ENTRY(vidc_fill_2x16_s)
  91                 mov     ip, #0xff00
  92                 orr     ip, ip, ip, lsr #8
  93 1:              cmp     r0, r1
  94                 bge     vidc_clear
  95                 ldr     r4, [r0], #4
  96                 str     r4, [r2], #4
  97                 cmp     r0, r1
  98                 ldrlt   r4, [r0], #4
  99                 strlt   r4, [r2], #4
 100                 cmp     r2, r3
 101                 blt     1b
 102                 mov     pc, lr
 103
 104 ENTRY(vidc_fill_noaudio)
 105                 mov     r0, #0
 106                 mov     r1, #0
 107 2:              mov     r4, #0
 108                 mov     r5, #0
 109 1:              cmp     r2, r3
 110                 stmltia r2!, {r0, r1, r4, r5}
 111                 blt     1b
 112                 mov     pc, lr
 113
 114 ENTRY(vidc_clear)
 115                 mov     r0, #0
 116                 mov     r1, #0
 117                 tst     r2, #4
 118                 str     r0, [r2], #4
 119                 tst     r2, #8
 120                 stmia   r2!, {r0, r1}
 121                 b       2b
 122
 123 /*
 124  * Call filler routines with:
 125  *  r0 = phys address
 126  *  r1 = phys end
 127  *  r2 = buffer
 128  * Returns:
 129  *  r0 = new buffer address
 130  *  r2 = new buffer finish
 131  *  r4 = corrupted
 132  *  r5 = corrupted
 133  *  ip = corrupted
 134  */
 135
 136 ENTRY(vidc_sound_dma_irq)
 137                 stmfd   sp!, {r4 - r8, lr}
 138                 ldr     r8, =dma_start
 139                 ldmia   r8, {r0, r1, r2, r3, r4, r5}
 140                 teq     r1, #0
 141                 adreq   r4, vidc_fill_noaudio
 142                 moveq   r7, #1 << 31
 143                 movne   r7, #0
 144                 mov     ip, #IOMD_BASE & 0xff000000
 145                 orr     ip, ip, #IOMD_BASE & 0x00ff0000
 146                 ldrb    r6, [ip, #IOMD_SD0ST]
 147                 tst     r6, #DMA_ST_OFL                 @ Check for overrun
 148                 eorne   r6, r6, #DMA_ST_AB
 149                 tst     r6, #DMA_ST_AB
 150                 moveq   r2, r3                          @ DMAing A, update B
 151                 add     r3, r2, r5                      @ End of DMA buffer
 152                 add     r1, r1, r0                      @ End of virtual DMA buffer
 153                 mov     lr, pc
 154                 mov     pc, r4                          @ Call fill routine (uses r4, ip)
 155                 sub     r1, r1, r0                      @ Remaining length
 156                 stmia   r8, {r0, r1}
 157                 mov     r0, #0
 158                 tst     r2, #4                          @ Round buffer up to 4 words
 159                 strne   r0, [r2], #4
 160                 tst     r2, #8
 161                 strne   r0, [r2], #4
 162                 strne   r0, [r2], #4
 163                 sub     r2, r2, #16
 164                 mov     r2, r2, lsl #20
 165                 movs    r2, r2, lsr #20
 166                 orreq   r2, r2, #1 << 30                @ Set L bit
 167                 orr     r2, r2, r7
 168                 ldmdb   r8, {r3, r4, r5}
 169                 tst     r6, #DMA_ST_AB
 170                 mov     ip, #IOMD_BASE & 0xff000000
 171                 orr     ip, ip, #IOMD_BASE & 0x00ff0000
 172                 streq   r4, [ip, #IOMD_SD0CURB]
 173                 strne   r5, [ip, #IOMD_SD0CURA]
 174                 streq   r2, [ip, #IOMD_SD0ENDB]
 175                 strne   r2, [ip, #IOMD_SD0ENDA]
 176                 ldr     lr, [ip, #IOMD_SD0ST]
 177                 tst     lr, #DMA_ST_OFL
 178                 bne     1f
 179                 tst     r6, #DMA_ST_AB
 180                 strne   r4, [ip, #IOMD_SD0CURB]
 181                 streq   r5, [ip, #IOMD_SD0CURA]
 182                 strne   r2, [ip, #IOMD_SD0ENDB]
 183                 streq   r2, [ip, #IOMD_SD0ENDA]
 184 1:              teq     r7, #0
 185                 mov     r0, #0x10
 186                 strneb  r0, [ip, #IOMD_SD0CR]
 187                 ldmfd   sp!, {r4 - r8, lr}
 188                 mov     r0, #1                          @ IRQ_HANDLED
 189                 teq     r1, #0                          @ If we have no more
 190                 movne   pc, lr
 191                 teq     r3, #0
 192                 movne   pc, r3                          @ Call interrupt routine
 193                 mov     pc, lr
 194
 195                 .data
 196                 .globl  dma_interrupt
 197 dma_interrupt:
 198                 .long   0                               @ r3
 199                 .globl  dma_pbuf
 200 dma_pbuf:
 201                 .long   0                               @ r4
 202                 .long   0                               @ r5
 203                 .globl  dma_start
 204 dma_start:
 205                 .long   0                               @ r0
 206                 .globl  dma_count
 207 dma_count:
 208                 .long   0                               @ r1
 209                 .globl  dma_buf
 210 dma_buf:
 211                 .long   0                               @ r2
 212                 .long   0                               @ r3
 213                 .globl  vidc_filler
 214 vidc_filler:
 215                 .long   vidc_fill_noaudio               @ r4
 216                 .globl  dma_bufsize
 217 dma_bufsize:
 218                 .long   0x1000                          @ r5