arch/mips/include/asm/jazzdma.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Helpfile for jazzdma.c -- Mips Jazz R4030 DMA controller support
   4  */
   5 #ifndef _ASM_JAZZDMA_H
   6 #define _ASM_JAZZDMA_H
   7
   8 /*
   9  * Prototypes and macros
  10  */
  11 extern unsigned long vdma_alloc(unsigned long paddr, unsigned long size);
  12 extern int vdma_free(unsigned long laddr);
  13 extern int vdma_remap(unsigned long laddr, unsigned long paddr,
  14                       unsigned long size);
  15 extern unsigned long vdma_phys2log(unsigned long paddr);
  16 extern unsigned long vdma_log2phys(unsigned long laddr);
  17 extern void vdma_stats(void);           /* for debugging only */
  18
  19 extern void vdma_enable(int channel);
  20 extern void vdma_disable(int channel);
  21 extern void vdma_set_mode(int channel, int mode);
  22 extern void vdma_set_addr(int channel, long addr);
  23 extern void vdma_set_count(int channel, int count);
  24 extern int vdma_get_residue(int channel);
  25 extern int vdma_get_enable(int channel);
  26
  27 /*
  28  * some definitions used by the driver functions
  29  */
  30 #define VDMA_PAGESIZE           4096
  31 #define VDMA_PGTBL_ENTRIES      4096
  32 #define VDMA_PGTBL_SIZE         (sizeof(VDMA_PGTBL_ENTRY) * VDMA_PGTBL_ENTRIES)
  33 #define VDMA_PAGE_EMPTY         0xff000000
  34
  35 /*
  36  * Macros to get page no. and offset of a given address
  37  * Note that VDMA_PAGE() works for physical addresses only
  38  */
  39 #define VDMA_PAGE(a)            ((unsigned int)(a) >> 12)
  40 #define VDMA_OFFSET(a)          ((unsigned int)(a) & (VDMA_PAGESIZE-1))
  41
  42 /*
  43  * error code returned by vdma_alloc()
  44  * (See also arch/mips/kernel/jazzdma.c)
  45  */
  46 #define VDMA_ERROR              0xffffffff
  47
  48 /*
  49  * VDMA pagetable entry description
  50  */
  51 typedef volatile struct VDMA_PGTBL_ENTRY {
  52         unsigned int frame;             /* physical frame no. */
  53         unsigned int owner;             /* owner of this entry (0=free) */
  54 } VDMA_PGTBL_ENTRY;
  55
  56
  57 /*
  58  * DMA channel control registers
  59  * in the R4030 MCT_ADR chip
  60  */
  61 #define JAZZ_R4030_CHNL_MODE    0xE0000100      /* 8 DMA Channel Mode Registers, */
  62                                                 /* 0xE0000100,120,140... */
  63 #define JAZZ_R4030_CHNL_ENABLE  0xE0000108      /* 8 DMA Channel Enable Regs, */
  64                                                 /* 0xE0000108,128,148... */
  65 #define JAZZ_R4030_CHNL_COUNT   0xE0000110      /* 8 DMA Channel Byte Cnt Regs, */
  66                                                 /* 0xE0000110,130,150... */
  67 #define JAZZ_R4030_CHNL_ADDR    0xE0000118      /* 8 DMA Channel Address Regs, */
  68                                                 /* 0xE0000118,138,158... */
  69
  70 /* channel enable register bits */
  71
  72 #define R4030_CHNL_ENABLE        (1<<0)
  73 #define R4030_CHNL_WRITE         (1<<1)
  74 #define R4030_TC_INTR            (1<<8)
  75 #define R4030_MEM_INTR           (1<<9)
  76 #define R4030_ADDR_INTR          (1<<10)
  77
  78 /*
  79  * Channel mode register bits
  80  */
  81 #define R4030_MODE_ATIME_40      (0) /* device access time on remote bus */
  82 #define R4030_MODE_ATIME_80      (1)
  83 #define R4030_MODE_ATIME_120     (2)
  84 #define R4030_MODE_ATIME_160     (3)
  85 #define R4030_MODE_ATIME_200     (4)
  86 #define R4030_MODE_ATIME_240     (5)
  87 #define R4030_MODE_ATIME_280     (6)
  88 #define R4030_MODE_ATIME_320     (7)
  89 #define R4030_MODE_WIDTH_8       (1<<3) /* device data bus width */
  90 #define R4030_MODE_WIDTH_16      (2<<3)
  91 #define R4030_MODE_WIDTH_32      (3<<3)
  92 #define R4030_MODE_INTR_EN       (1<<5)
  93 #define R4030_MODE_BURST         (1<<6) /* Rev. 2 only */
  94 #define R4030_MODE_FAST_ACK      (1<<7) /* Rev. 2 only */
  95
  96 #endif /* _ASM_JAZZDMA_H */