219 строки
4.3 KiB
ArmAsm
219 строки
4.3 KiB
ArmAsm
/*
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* linux/drivers/sound/vidc_fill.S
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*
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* Copyright (C) 1997 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Filler routines for DMA buffers
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <asm/hardware.h>
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#include <asm/hardware/iomd.h>
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.text
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ENTRY(vidc_fill_1x8_u)
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mov ip, #0xff00
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1: cmp r0, r1
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bge vidc_clear
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ldrb r4, [r0], #1
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eor r4, r4, #0x80
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and r4, ip, r4, lsl #8
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orr r4, r4, r4, lsl #16
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str r4, [r2], #4
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cmp r2, r3
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blt 1b
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mov pc, lr
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ENTRY(vidc_fill_2x8_u)
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mov ip, #0xff00
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1: cmp r0, r1
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bge vidc_clear
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ldr r4, [r0], #2
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and r5, r4, ip
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and r4, ip, r4, lsl #8
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orr r4, r4, r5, lsl #16
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orr r4, r4, r4, lsr #8
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str r4, [r2], #4
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cmp r2, r3
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blt 1b
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mov pc, lr
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ENTRY(vidc_fill_1x8_s)
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mov ip, #0xff00
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1: cmp r0, r1
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bge vidc_clear
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ldrb r4, [r0], #1
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and r4, ip, r4, lsl #8
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orr r4, r4, r4, lsl #16
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str r4, [r2], #4
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cmp r2, r3
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blt 1b
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mov pc, lr
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ENTRY(vidc_fill_2x8_s)
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mov ip, #0xff00
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1: cmp r0, r1
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bge vidc_clear
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ldr r4, [r0], #2
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and r5, r4, ip
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and r4, ip, r4, lsl #8
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orr r4, r4, r5, lsl #16
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orr r4, r4, r4, lsr #8
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str r4, [r2], #4
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cmp r2, r3
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blt 1b
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mov pc, lr
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ENTRY(vidc_fill_1x16_s)
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mov ip, #0xff00
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orr ip, ip, ip, lsr #8
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1: cmp r0, r1
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bge vidc_clear
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ldr r5, [r0], #2
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and r4, r5, ip
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orr r4, r4, r4, lsl #16
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str r4, [r2], #4
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cmp r0, r1
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addlt r0, r0, #2
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andlt r4, r5, ip, lsl #16
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orrlt r4, r4, r4, lsr #16
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strlt r4, [r2], #4
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cmp r2, r3
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blt 1b
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mov pc, lr
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ENTRY(vidc_fill_2x16_s)
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mov ip, #0xff00
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orr ip, ip, ip, lsr #8
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1: cmp r0, r1
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bge vidc_clear
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ldr r4, [r0], #4
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str r4, [r2], #4
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cmp r0, r1
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ldrlt r4, [r0], #4
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strlt r4, [r2], #4
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cmp r2, r3
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blt 1b
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mov pc, lr
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ENTRY(vidc_fill_noaudio)
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mov r0, #0
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mov r1, #0
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2: mov r4, #0
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mov r5, #0
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1: cmp r2, r3
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stmltia r2!, {r0, r1, r4, r5}
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blt 1b
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mov pc, lr
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ENTRY(vidc_clear)
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mov r0, #0
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mov r1, #0
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tst r2, #4
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str r0, [r2], #4
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tst r2, #8
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stmia r2!, {r0, r1}
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b 2b
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/*
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* Call filler routines with:
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* r0 = phys address
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* r1 = phys end
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* r2 = buffer
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* Returns:
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* r0 = new buffer address
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* r2 = new buffer finish
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* r4 = corrupted
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* r5 = corrupted
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* ip = corrupted
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*/
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ENTRY(vidc_sound_dma_irq)
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stmfd sp!, {r4 - r8, lr}
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ldr r8, =dma_start
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ldmia r8, {r0, r1, r2, r3, r4, r5}
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teq r1, #0
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adreq r4, vidc_fill_noaudio
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moveq r7, #1 << 31
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movne r7, #0
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mov ip, #IOMD_BASE & 0xff000000
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orr ip, ip, #IOMD_BASE & 0x00ff0000
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ldrb r6, [ip, #IOMD_SD0ST]
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tst r6, #DMA_ST_OFL @ Check for overrun
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eorne r6, r6, #DMA_ST_AB
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tst r6, #DMA_ST_AB
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moveq r2, r3 @ DMAing A, update B
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add r3, r2, r5 @ End of DMA buffer
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add r1, r1, r0 @ End of virtual DMA buffer
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mov lr, pc
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mov pc, r4 @ Call fill routine (uses r4, ip)
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sub r1, r1, r0 @ Remaining length
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stmia r8, {r0, r1}
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mov r0, #0
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tst r2, #4 @ Round buffer up to 4 words
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strne r0, [r2], #4
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tst r2, #8
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strne r0, [r2], #4
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strne r0, [r2], #4
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sub r2, r2, #16
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mov r2, r2, lsl #20
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movs r2, r2, lsr #20
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orreq r2, r2, #1 << 30 @ Set L bit
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orr r2, r2, r7
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ldmdb r8, {r3, r4, r5}
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tst r6, #DMA_ST_AB
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mov ip, #IOMD_BASE & 0xff000000
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orr ip, ip, #IOMD_BASE & 0x00ff0000
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streq r4, [ip, #IOMD_SD0CURB]
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strne r5, [ip, #IOMD_SD0CURA]
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streq r2, [ip, #IOMD_SD0ENDB]
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strne r2, [ip, #IOMD_SD0ENDA]
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ldr lr, [ip, #IOMD_SD0ST]
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tst lr, #DMA_ST_OFL
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bne 1f
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tst r6, #DMA_ST_AB
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strne r4, [ip, #IOMD_SD0CURB]
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streq r5, [ip, #IOMD_SD0CURA]
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strne r2, [ip, #IOMD_SD0ENDB]
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streq r2, [ip, #IOMD_SD0ENDA]
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1: teq r7, #0
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mov r0, #0x10
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strneb r0, [ip, #IOMD_SD0CR]
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ldmfd sp!, {r4 - r8, lr}
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mov r0, #1 @ IRQ_HANDLED
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teq r1, #0 @ If we have no more
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movne pc, lr
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teq r3, #0
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movne pc, r3 @ Call interrupt routine
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mov pc, lr
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.data
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.globl dma_interrupt
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dma_interrupt:
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.long 0 @ r3
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.globl dma_pbuf
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dma_pbuf:
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.long 0 @ r4
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.long 0 @ r5
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.globl dma_start
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dma_start:
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.long 0 @ r0
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.globl dma_count
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dma_count:
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.long 0 @ r1
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.globl dma_buf
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dma_buf:
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.long 0 @ r2
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.long 0 @ r3
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.globl vidc_filler
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vidc_filler:
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.long vidc_fill_noaudio @ r4
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.globl dma_bufsize
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dma_bufsize:
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.long 0x1000 @ r5
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