diff options
Diffstat (limited to 'arch/mips/include/asm/jazzdma.h')
| -rw-r--r-- | arch/mips/include/asm/jazzdma.h | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/arch/mips/include/asm/jazzdma.h b/arch/mips/include/asm/jazzdma.h new file mode 100644 index 000000000..c831da7fa --- /dev/null +++ b/arch/mips/include/asm/jazzdma.h @@ -0,0 +1,88 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Helpfile for jazzdma.c -- Mips Jazz R4030 DMA controller support + */ +#ifndef _ASM_JAZZDMA_H +#define _ASM_JAZZDMA_H + +/* + * Prototypes and macros + */ +extern unsigned long vdma_alloc(unsigned long paddr, unsigned long size); +extern int vdma_free(unsigned long laddr); +extern unsigned long vdma_phys2log(unsigned long paddr); +extern unsigned long vdma_log2phys(unsigned long laddr); +extern void vdma_stats(void); /* for debugging only */ + +extern void vdma_enable(int channel); +extern void vdma_disable(int channel); +extern void vdma_set_mode(int channel, int mode); +extern void vdma_set_addr(int channel, long addr); +extern void vdma_set_count(int channel, int count); +extern int vdma_get_residue(int channel); +extern int vdma_get_enable(int channel); + +/* + * some definitions used by the driver functions + */ +#define VDMA_PAGESIZE 4096 +#define VDMA_PGTBL_ENTRIES 4096 +#define VDMA_PGTBL_SIZE (sizeof(VDMA_PGTBL_ENTRY) * VDMA_PGTBL_ENTRIES) +#define VDMA_PAGE_EMPTY 0xff000000 + +/* + * Macros to get page no. and offset of a given address + * Note that VDMA_PAGE() works for physical addresses only + */ +#define VDMA_PAGE(a) ((unsigned int)(a) >> 12) +#define VDMA_OFFSET(a) ((unsigned int)(a) & (VDMA_PAGESIZE-1)) + +/* + * VDMA pagetable entry description + */ +typedef volatile struct VDMA_PGTBL_ENTRY { + unsigned int frame; /* physical frame no. */ + unsigned int owner; /* owner of this entry (0=free) */ +} VDMA_PGTBL_ENTRY; + + +/* + * DMA channel control registers + * in the R4030 MCT_ADR chip + */ +#define JAZZ_R4030_CHNL_MODE 0xE0000100 /* 8 DMA Channel Mode Registers, */ + /* 0xE0000100,120,140... */ +#define JAZZ_R4030_CHNL_ENABLE 0xE0000108 /* 8 DMA Channel Enable Regs, */ + /* 0xE0000108,128,148... */ +#define JAZZ_R4030_CHNL_COUNT 0xE0000110 /* 8 DMA Channel Byte Cnt Regs, */ + /* 0xE0000110,130,150... */ +#define JAZZ_R4030_CHNL_ADDR 0xE0000118 /* 8 DMA Channel Address Regs, */ + /* 0xE0000118,138,158... */ + +/* channel enable register bits */ + +#define R4030_CHNL_ENABLE (1<<0) +#define R4030_CHNL_WRITE (1<<1) +#define R4030_TC_INTR (1<<8) +#define R4030_MEM_INTR (1<<9) +#define R4030_ADDR_INTR (1<<10) + +/* + * Channel mode register bits + */ +#define R4030_MODE_ATIME_40 (0) /* device access time on remote bus */ +#define R4030_MODE_ATIME_80 (1) +#define R4030_MODE_ATIME_120 (2) +#define R4030_MODE_ATIME_160 (3) +#define R4030_MODE_ATIME_200 (4) +#define R4030_MODE_ATIME_240 (5) +#define R4030_MODE_ATIME_280 (6) +#define R4030_MODE_ATIME_320 (7) +#define R4030_MODE_WIDTH_8 (1<<3) /* device data bus width */ +#define R4030_MODE_WIDTH_16 (2<<3) +#define R4030_MODE_WIDTH_32 (3<<3) +#define R4030_MODE_INTR_EN (1<<5) +#define R4030_MODE_BURST (1<<6) /* Rev. 2 only */ +#define R4030_MODE_FAST_ACK (1<<7) /* Rev. 2 only */ + +#endif /* _ASM_JAZZDMA_H */ |