include/asm-mips/jazzdma.h

   1 /*
   2  * Helpfile for jazzdma.c -- Mips Jazz R4030 DMA controller support
   3  *
   4  * $Id: jazzdma.h,v 1.6 1998/05/01 01:35:57 ralf Exp $
   5  */
   6 #ifndef __ASM_MIPS_JAZZDMA_H
   7 #define __ASM_MIPS_JAZZDMA_H
   8
   9 /*
  10  * Prototypes and macros
  11  */
  12 unsigned long vdma_init(unsigned long memory_start, unsigned long memory_end);
  13 unsigned long vdma_alloc(unsigned long paddr, unsigned long size);
  14 int vdma_free(unsigned long laddr);
  15 int vdma_remap(unsigned long laddr, unsigned long paddr, unsigned long size);
  16 unsigned long vdma_phys2log(unsigned long paddr);
  17 unsigned long vdma_log2phys(unsigned long laddr);
  18 void vdma_stats(void);          /* for debugging only */
  19
  20 void vdma_enable(int channel);
  21 void vdma_disable(int channel);
  22 void vdma_set_mode(int channel, int mode);
  23 void vdma_set_addr(int channel, long addr);
  24 void vdma_set_count(int channel, int count);
  25 int vdma_get_residue(int channel);
  26 int vdma_get_enable(int channel);
  27
  28 /*
  29  * some definitions used by the driver functions
  30  */
  31 #define VDMA_PAGESIZE           4096
  32 #define VDMA_PGTBL_ENTRIES      4096
  33 #define VDMA_PGTBL_SIZE         (sizeof(VDMA_PGTBL_ENTRY) * VDMA_PGTBL_ENTRIES)
  34 #define VDMA_PAGE_EMPTY         0xff000000
  35
  36 /*
  37  * Macros to get page no. and offset of a given address
  38  * Note that VDMA_PAGE() works for physical addresses only
  39  */
  40 #define VDMA_PAGE(a)            ((unsigned int)(a) >> 12)
  41 #define VDMA_OFFSET(a)          ((unsigned int)(a) & (VDMA_PAGESIZE-1))
  42
  43 /*
  44  * error code returned by vdma_alloc()
  45  * (See also arch/mips/kernel/jazzdma.c)
  46  */
  47 #define VDMA_ERROR              0xffffffff
  48
  49 /*
  50  * VDMA pagetable entry description
  51  */
  52 typedef volatile struct VDMA_PGTBL_ENTRY
  53 {
  54         unsigned int frame;             /* physical frame no. */
  55         unsigned int owner;             /* owner of this entry (0=free) */
  56 } VDMA_PGTBL_ENTRY;
  57
  58
  59 /*
  60  * DMA channel control registers
  61  * in the R4030 MCT_ADR chip
  62  */
  63 #define JAZZ_R4030_CHNL_MODE    0xE0000100      /* 8 DMA Channel Mode Registers, */
  64                                                 /* 0xE0000100,120,140... */
  65 #define JAZZ_R4030_CHNL_ENABLE  0xE0000108      /* 8 DMA Channel Enable Regs, */
  66                                                 /* 0xE0000108,128,148... */
  67 #define JAZZ_R4030_CHNL_COUNT   0xE0000110      /* 8 DMA Channel Byte Cnt Regs, */
  68                                                 /* 0xE0000110,130,150... */
  69 #define JAZZ_R4030_CHNL_ADDR    0xE0000118      /* 8 DMA Channel Address Regs, */
  70                                                 /* 0xE0000118,138,158... */
  71
  72 /* channel enable register bits */
  73
  74 #define R4030_CHNL_ENABLE        (1<<0)
  75 #define R4030_CHNL_WRITE         (1<<1)
  76 #define R4030_TC_INTR            (1<<8)
  77 #define R4030_MEM_INTR           (1<<9)
  78 #define R4030_ADDR_INTR          (1<<10)
  79
  80 /*
  81  * Channel mode register bits
  82  */
  83 #define R4030_MODE_ATIME_40      (0) /* device access time on remote bus */
  84 #define R4030_MODE_ATIME_80      (1)
  85 #define R4030_MODE_ATIME_120     (2)
  86 #define R4030_MODE_ATIME_160     (3)
  87 #define R4030_MODE_ATIME_200     (4)
  88 #define R4030_MODE_ATIME_240     (5)
  89 #define R4030_MODE_ATIME_280     (6)
  90 #define R4030_MODE_ATIME_320     (7)
  91 #define R4030_MODE_WIDTH_8       (1<<3) /* device data bus width */
  92 #define R4030_MODE_WIDTH_16      (2<<3)
  93 #define R4030_MODE_WIDTH_32      (3<<3)
  94 #define R4030_MODE_INTR_EN       (1<<5)
  95 #define R4030_MODE_BURST         (1<<6) /* Rev. 2 only */
  96 #define R4030_MODE_FAST_ACK      (1<<7) /* Rev. 2 only */
  97
  98 #endif /* __ASM_MIPS_JAZZDMA_H */