arch/sparc/include/asm/dma.h

   1 #ifndef _ASM_SPARC_DMA_H
   2 #define _ASM_SPARC_DMA_H
   3
   4 /* These are irrelevant for Sparc DMA, but we leave it in so that
   5  * things can compile.
   6  */
   7 #define MAX_DMA_CHANNELS 8
   8 #define DMA_MODE_READ    1
   9 #define DMA_MODE_WRITE   2
  10 #define MAX_DMA_ADDRESS  (~0UL)
  11
  12 /* Useful constants */
  13 #define SIZE_16MB      (16*1024*1024)
  14 #define SIZE_64K       (64*1024)
  15
  16 /* SBUS DMA controller reg offsets */
  17 #define DMA_CSR         0x00UL          /* rw  DMA control/status register    0x00   */
  18 #define DMA_ADDR        0x04UL          /* rw  DMA transfer address register  0x04   */
  19 #define DMA_COUNT       0x08UL          /* rw  DMA transfer count register    0x08   */
  20 #define DMA_TEST        0x0cUL          /* rw  DMA test/debug register        0x0c   */
  21
  22 /* Fields in the cond_reg register */
  23 /* First, the version identification bits */
  24 #define DMA_DEVICE_ID    0xf0000000        /* Device identification bits */
  25 #define DMA_VERS0        0x00000000        /* Sunray DMA version */
  26 #define DMA_ESCV1        0x40000000        /* DMA ESC Version 1 */
  27 #define DMA_VERS1        0x80000000        /* DMA rev 1 */
  28 #define DMA_VERS2        0xa0000000        /* DMA rev 2 */
  29 #define DMA_VERHME       0xb0000000        /* DMA hme gate array */
  30 #define DMA_VERSPLUS     0x90000000        /* DMA rev 1 PLUS */
  31
  32 #define DMA_HNDL_INTR    0x00000001        /* An IRQ needs to be handled */
  33 #define DMA_HNDL_ERROR   0x00000002        /* We need to take an error */
  34 #define DMA_FIFO_ISDRAIN 0x0000000c        /* The DMA FIFO is draining */
  35 #define DMA_INT_ENAB     0x00000010        /* Turn on interrupts */
  36 #define DMA_FIFO_INV     0x00000020        /* Invalidate the FIFO */
  37 #define DMA_ACC_SZ_ERR   0x00000040        /* The access size was bad */
  38 #define DMA_FIFO_STDRAIN 0x00000040        /* DMA_VERS1 Drain the FIFO */
  39 #define DMA_RST_SCSI     0x00000080        /* Reset the SCSI controller */
  40 #define DMA_RST_ENET     DMA_RST_SCSI      /* Reset the ENET controller */
  41 #define DMA_ST_WRITE     0x00000100        /* write from device to memory */
  42 #define DMA_ENABLE       0x00000200        /* Fire up DMA, handle requests */
  43 #define DMA_PEND_READ    0x00000400        /* DMA_VERS1/0/PLUS Pending Read */
  44 #define DMA_ESC_BURST    0x00000800        /* 1=16byte 0=32byte */
  45 #define DMA_READ_AHEAD   0x00001800        /* DMA read ahead partial longword */
  46 #define DMA_DSBL_RD_DRN  0x00001000        /* No EC drain on slave reads */
  47 #define DMA_BCNT_ENAB    0x00002000        /* If on, use the byte counter */
  48 #define DMA_TERM_CNTR    0x00004000        /* Terminal counter */
  49 #define DMA_SCSI_SBUS64  0x00008000        /* HME: Enable 64-bit SBUS mode. */
  50 #define DMA_CSR_DISAB    0x00010000        /* No FIFO drains during csr */
  51 #define DMA_SCSI_DISAB   0x00020000        /* No FIFO drains during reg */
  52 #define DMA_DSBL_WR_INV  0x00020000        /* No EC inval. on slave writes */
  53 #define DMA_ADD_ENABLE   0x00040000        /* Special ESC DVMA optimization */
  54 #define DMA_E_BURSTS     0x000c0000        /* ENET: SBUS r/w burst mask */
  55 #define DMA_E_BURST32    0x00040000        /* ENET: SBUS 32 byte r/w burst */
  56 #define DMA_E_BURST16    0x00000000        /* ENET: SBUS 16 byte r/w burst */
  57 #define DMA_BRST_SZ      0x000c0000        /* SCSI: SBUS r/w burst size */
  58 #define DMA_BRST64       0x000c0000        /* SCSI: 64byte bursts (HME on UltraSparc only) */
  59 #define DMA_BRST32       0x00040000        /* SCSI: 32byte bursts */
  60 #define DMA_BRST16       0x00000000        /* SCSI: 16byte bursts */
  61 #define DMA_BRST0        0x00080000        /* SCSI: no bursts (non-HME gate arrays) */
  62 #define DMA_ADDR_DISAB   0x00100000        /* No FIFO drains during addr */
  63 #define DMA_2CLKS        0x00200000        /* Each transfer = 2 clock ticks */
  64 #define DMA_3CLKS        0x00400000        /* Each transfer = 3 clock ticks */
  65 #define DMA_EN_ENETAUI   DMA_3CLKS         /* Put lance into AUI-cable mode */
  66 #define DMA_CNTR_DISAB   0x00800000        /* No IRQ when DMA_TERM_CNTR set */
  67 #define DMA_AUTO_NADDR   0x01000000        /* Use "auto nxt addr" feature */
  68 #define DMA_SCSI_ON      0x02000000        /* Enable SCSI dma */
  69 #define DMA_PARITY_OFF   0x02000000        /* HME: disable parity checking */
  70 #define DMA_LOADED_ADDR  0x04000000        /* Address has been loaded */
  71 #define DMA_LOADED_NADDR 0x08000000        /* Next address has been loaded */
  72 #define DMA_RESET_FAS366 0x08000000        /* HME: Assert RESET to FAS366 */
  73
  74 /* Values describing the burst-size property from the PROM */
  75 #define DMA_BURST1       0x01
  76 #define DMA_BURST2       0x02
  77 #define DMA_BURST4       0x04
  78 #define DMA_BURST8       0x08
  79 #define DMA_BURST16      0x10
  80 #define DMA_BURST32      0x20
  81 #define DMA_BURST64      0x40
  82 #define DMA_BURSTBITS    0x7f
  83
  84 /* From PCI */
  85
  86 #ifdef CONFIG_PCI
  87 extern int isa_dma_bridge_buggy;
  88 #else
  89 #define isa_dma_bridge_buggy    (0)
  90 #endif
  91
  92 #ifdef CONFIG_SPARC32
  93
  94 /* Routines for data transfer buffers. */
  95 struct device;
  96 struct scatterlist;
  97
  98 struct sparc32_dma_ops {
  99         __u32 (*get_scsi_one)(struct device *, char *, unsigned long);
 100         void (*get_scsi_sgl)(struct device *, struct scatterlist *, int);
 101         void (*release_scsi_one)(struct device *, __u32, unsigned long);
 102         void (*release_scsi_sgl)(struct device *, struct scatterlist *,int);
 103 #ifdef CONFIG_SBUS
 104         int (*map_dma_area)(struct device *, dma_addr_t *, unsigned long, unsigned long, int);
 105         void (*unmap_dma_area)(struct device *, unsigned long, int);
 106 #endif
 107 };
 108 extern const struct sparc32_dma_ops *sparc32_dma_ops;
 109
 110 #define mmu_get_scsi_one(dev,vaddr,len) \
 111         sparc32_dma_ops->get_scsi_one(dev, vaddr, len)
 112 #define mmu_get_scsi_sgl(dev,sg,sz) \
 113         sparc32_dma_ops->get_scsi_sgl(dev, sg, sz)
 114 #define mmu_release_scsi_one(dev,vaddr,len) \
 115         sparc32_dma_ops->release_scsi_one(dev, vaddr,len)
 116 #define mmu_release_scsi_sgl(dev,sg,sz) \
 117         sparc32_dma_ops->release_scsi_sgl(dev, sg, sz)
 118
 119 #ifdef CONFIG_SBUS
 120 /*
 121  * mmu_map/unmap are provided by iommu/iounit; Invalid to call on IIep.
 122  *
 123  * The mmu_map_dma_area establishes two mappings in one go.
 124  * These mappings point to pages normally mapped at 'va' (linear address).
 125  * First mapping is for CPU visible address at 'a', uncached.
 126  * This is an alias, but it works because it is an uncached mapping.
 127  * Second mapping is for device visible address, or "bus" address.
 128  * The bus address is returned at '*pba'.
 129  *
 130  * These functions seem distinct, but are hard to split.
 131  * On sun4m, page attributes depend on the CPU type, so we have to
 132  * know if we are mapping RAM or I/O, so it has to be an additional argument
 133  * to a separate mapping function for CPU visible mappings.
 134  */
 135 #define sbus_map_dma_area(dev,pba,va,a,len) \
 136         sparc32_dma_ops->map_dma_area(dev, pba, va, a, len)
 137 #define sbus_unmap_dma_area(dev,ba,len) \
 138         sparc32_dma_ops->unmap_dma_area(dev, ba, len)
 139 #endif /* CONFIG_SBUS */
 140
 141 #endif
 142
 143 #endif /* !(_ASM_SPARC_DMA_H) */