diff options
Diffstat (limited to 'target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/cns3xxx_fiq.S')
-rw-r--r-- | target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/cns3xxx_fiq.S | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/cns3xxx_fiq.S b/target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/cns3xxx_fiq.S new file mode 100644 index 000000000..c02a382a9 --- /dev/null +++ b/target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/cns3xxx_fiq.S @@ -0,0 +1,96 @@ +/* + * Copyright (C) 2012 Gateworks Corporation + * Chris Lang <clang@gateworks.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 <asm/assembler.h> +#include <asm/asm-offsets.h> + +#define D_CACHE_LINE_SIZE 32 + + .text + +/* + * R8 - DMA Start Address + * R9 - DMA Length + * R10 - DMA Direction + * R11 - DMA type + * R12 - fiq_buffer Address + * R13 - DMA type Address +*/ + + .global cns3xxx_fiq_end +ENTRY(cns3xxx_fiq_start) + mov r8, #0 + str r8, [r13] + + ldr r9, [r12] + ldr r8, [r9] + add r8, r8, #1 + str r8, [r9] + + ldmib r12, {r8, r9, r10} + and r11, r10, #0x3000000 + and r10, r10, #0xff + + teq r11, #0x1000000 + beq cns3xxx_dma_map_area + teq r11, #0x2000000 + beq cns3xxx_dma_unmap_area + b cns3xxx_dma_flush_range + +cns3xxx_fiq_exit: + mov r8, #0 + str r8, [r12, #12] + mcr p15, 0, r8, c7, c10, 4 @ drain write buffer + subs pc, lr, #4 + +cns3xxx_dma_map_area: + add r9, r9, r8 + teq r10, #DMA_FROM_DEVICE + beq cns3xxx_dma_inv_range + b cns3xxx_dma_clean_range + +cns3xxx_dma_unmap_area: + add r9, r9, r8 + teq r10, #DMA_TO_DEVICE + bne cns3xxx_dma_inv_range + b cns3xxx_fiq_exit + +cns3xxx_dma_flush_range: + bic r8, r8, #D_CACHE_LINE_SIZE - 1 +1: + mcr p15, 0, r8, c7, c14, 1 @ clean & invalidate D line + add r8, r8, #D_CACHE_LINE_SIZE + cmp r8, r9 + blo 1b + b cns3xxx_fiq_exit + +cns3xxx_dma_clean_range: + bic r8, r8, #D_CACHE_LINE_SIZE - 1 +1: + mcr p15, 0, r8, c7, c10, 1 @ clean D line + add r8, r8, #D_CACHE_LINE_SIZE + cmp r8, r9 + blo 1b + b cns3xxx_fiq_exit + +cns3xxx_dma_inv_range: + tst r8, #D_CACHE_LINE_SIZE - 1 + bic r8, r8, #D_CACHE_LINE_SIZE - 1 + mcrne p15, 0, r8, c7, c10, 1 @ clean D line + tst r9, #D_CACHE_LINE_SIZE - 1 + bic r9, r9, #D_CACHE_LINE_SIZE - 1 + mcrne p15, 0, r9, c7, c14, 1 @ clean & invalidate D line +1: + mcr p15, 0, r8, c7, c6, 1 @ invalidate D line + add r8, r8, #D_CACHE_LINE_SIZE + cmp r8, r9 + blo 1b + b cns3xxx_fiq_exit + +cns3xxx_fiq_end: |