include/asm-sparc64/dma.h

   1 /* $Id: dma.h,v 1.21 2001/12/13 04:16:52 davem Exp $
   2  * include/asm-sparc64/dma.h
   3  *
   4  * Copyright 1996 (C) David S. Miller (davem@caip.rutgers.edu)
   5  */
   6
   7 #ifndef _ASM_SPARC64_DMA_H
   8 #define _ASM_SPARC64_DMA_H
   9
  10 #include <linux/kernel.h>
  11 #include <linux/types.h>
  12 #include <linux/spinlock.h>
  13
  14 #include <asm/sbus.h>
  15 #include <asm/delay.h>
  16 #include <asm/oplib.h>
  17
  18 /* These are irrelevant for Sparc DMA, but we leave it in so that
  19  * things can compile.
  20  */
  21 #define MAX_DMA_CHANNELS 8
  22 #define DMA_MODE_READ    1
  23 #define DMA_MODE_WRITE   2
  24 #define MAX_DMA_ADDRESS  (~0UL)
  25
  26 /* Useful constants */
  27 #define SIZE_16MB      (16*1024*1024)
  28 #define SIZE_64K       (64*1024)
  29
  30 /* SBUS DMA controller reg offsets */
  31 #define DMA_CSR         0x00UL          /* rw  DMA control/status register    0x00   */
  32 #define DMA_ADDR        0x04UL          /* rw  DMA transfer address register  0x04   */
  33 #define DMA_COUNT       0x08UL          /* rw  DMA transfer count register    0x08   */
  34 #define DMA_TEST        0x0cUL          /* rw  DMA test/debug register        0x0c   */
  35
  36 /* DVMA chip revisions */
  37 enum dvma_rev {
  38         dvmarev0,
  39         dvmaesc1,
  40         dvmarev1,
  41         dvmarev2,
  42         dvmarev3,
  43         dvmarevplus,
  44         dvmahme
  45 };
  46
  47 #define DMA_HASCOUNT(rev)  ((rev)==dvmaesc1)
  48
  49 /* Linux DMA information structure, filled during probe. */
  50 struct sbus_dma {
  51         struct sbus_dma *next;
  52         struct sbus_dev *sdev;
  53         void __iomem *regs;
  54
  55         /* Status, misc info */
  56         int node;                /* Prom node for this DMA device */
  57         int running;             /* Are we doing DMA now? */
  58         int allocated;           /* Are we "owned" by anyone yet? */
  59
  60         /* Transfer information. */
  61         u32 addr;                /* Start address of current transfer */
  62         int nbytes;              /* Size of current transfer */
  63         int realbytes;           /* For splitting up large transfers, etc. */
  64
  65         /* DMA revision */
  66         enum dvma_rev revision;
  67 };
  68
  69 extern struct sbus_dma *dma_chain;
  70
  71 /* Broken hardware... */
  72 #define DMA_ISBROKEN(dma)    ((dma)->revision == dvmarev1)
  73 #define DMA_ISESC1(dma)      ((dma)->revision == dvmaesc1)
  74
  75 /* Main routines in dma.c */
  76 extern void dvma_init(struct sbus_bus *);
  77
  78 /* Fields in the cond_reg register */
  79 /* First, the version identification bits */
  80 #define DMA_DEVICE_ID    0xf0000000        /* Device identification bits */
  81 #define DMA_VERS0        0x00000000        /* Sunray DMA version */
  82 #define DMA_ESCV1        0x40000000        /* DMA ESC Version 1 */
  83 #define DMA_VERS1        0x80000000        /* DMA rev 1 */
  84 #define DMA_VERS2        0xa0000000        /* DMA rev 2 */
  85 #define DMA_VERHME       0xb0000000        /* DMA hme gate array */
  86 #define DMA_VERSPLUS     0x90000000        /* DMA rev 1 PLUS */
  87
  88 #define DMA_HNDL_INTR    0x00000001        /* An IRQ needs to be handled */
  89 #define DMA_HNDL_ERROR   0x00000002        /* We need to take an error */
  90 #define DMA_FIFO_ISDRAIN 0x0000000c        /* The DMA FIFO is draining */
  91 #define DMA_INT_ENAB     0x00000010        /* Turn on interrupts */
  92 #define DMA_FIFO_INV     0x00000020        /* Invalidate the FIFO */
  93 #define DMA_ACC_SZ_ERR   0x00000040        /* The access size was bad */
  94 #define DMA_FIFO_STDRAIN 0x00000040        /* DMA_VERS1 Drain the FIFO */
  95 #define DMA_RST_SCSI     0x00000080        /* Reset the SCSI controller */
  96 #define DMA_RST_ENET     DMA_RST_SCSI      /* Reset the ENET controller */
  97 #define DMA_ST_WRITE     0x00000100        /* write from device to memory */
  98 #define DMA_ENABLE       0x00000200        /* Fire up DMA, handle requests */
  99 #define DMA_PEND_READ    0x00000400        /* DMA_VERS1/0/PLUS Pending Read */
 100 #define DMA_ESC_BURST    0x00000800        /* 1=16byte 0=32byte */
 101 #define DMA_READ_AHEAD   0x00001800        /* DMA read ahead partial longword */
 102 #define DMA_DSBL_RD_DRN  0x00001000        /* No EC drain on slave reads */
 103 #define DMA_BCNT_ENAB    0x00002000        /* If on, use the byte counter */
 104 #define DMA_TERM_CNTR    0x00004000        /* Terminal counter */
 105 #define DMA_SCSI_SBUS64  0x00008000        /* HME: Enable 64-bit SBUS mode. */
 106 #define DMA_CSR_DISAB    0x00010000        /* No FIFO drains during csr */
 107 #define DMA_SCSI_DISAB   0x00020000        /* No FIFO drains during reg */
 108 #define DMA_DSBL_WR_INV  0x00020000        /* No EC inval. on slave writes */
 109 #define DMA_ADD_ENABLE   0x00040000        /* Special ESC DVMA optimization */
 110 #define DMA_E_BURSTS     0x000c0000        /* ENET: SBUS r/w burst mask */
 111 #define DMA_E_BURST32    0x00040000        /* ENET: SBUS 32 byte r/w burst */
 112 #define DMA_E_BURST16    0x00000000        /* ENET: SBUS 16 byte r/w burst */
 113 #define DMA_BRST_SZ      0x000c0000        /* SCSI: SBUS r/w burst size */
 114 #define DMA_BRST64       0x000c0000        /* SCSI: 64byte bursts (HME on UltraSparc only) */
 115 #define DMA_BRST32       0x00040000        /* SCSI: 32byte bursts */
 116 #define DMA_BRST16       0x00000000        /* SCSI: 16byte bursts */
 117 #define DMA_BRST0        0x00080000        /* SCSI: no bursts (non-HME gate arrays) */
 118 #define DMA_ADDR_DISAB   0x00100000        /* No FIFO drains during addr */
 119 #define DMA_2CLKS        0x00200000        /* Each transfer = 2 clock ticks */
 120 #define DMA_3CLKS        0x00400000        /* Each transfer = 3 clock ticks */
 121 #define DMA_EN_ENETAUI   DMA_3CLKS         /* Put lance into AUI-cable mode */
 122 #define DMA_CNTR_DISAB   0x00800000        /* No IRQ when DMA_TERM_CNTR set */
 123 #define DMA_AUTO_NADDR   0x01000000        /* Use "auto nxt addr" feature */
 124 #define DMA_SCSI_ON      0x02000000        /* Enable SCSI dma */
 125 #define DMA_PARITY_OFF   0x02000000        /* HME: disable parity checking */
 126 #define DMA_LOADED_ADDR  0x04000000        /* Address has been loaded */
 127 #define DMA_LOADED_NADDR 0x08000000        /* Next address has been loaded */
 128 #define DMA_RESET_FAS366 0x08000000        /* HME: Assert RESET to FAS366 */
 129
 130 /* Values describing the burst-size property from the PROM */
 131 #define DMA_BURST1       0x01
 132 #define DMA_BURST2       0x02
 133 #define DMA_BURST4       0x04
 134 #define DMA_BURST8       0x08
 135 #define DMA_BURST16      0x10
 136 #define DMA_BURST32      0x20
 137 #define DMA_BURST64      0x40
 138 #define DMA_BURSTBITS    0x7f
 139
 140 /* Determine highest possible final transfer address given a base */
 141 #define DMA_MAXEND(addr) (0x01000000UL-(((unsigned long)(addr))&0x00ffffffUL))
 142
 143 /* Yes, I hack a lot of elisp in my spare time... */
 144 #define DMA_ERROR_P(regs)  ((sbus_readl((regs) + DMA_CSR) & DMA_HNDL_ERROR))
 145 #define DMA_IRQ_P(regs)    ((sbus_readl((regs) + DMA_CSR)) & (DMA_HNDL_INTR | DMA_HNDL_ERROR))
 146 #define DMA_WRITE_P(regs)  ((sbus_readl((regs) + DMA_CSR) & DMA_ST_WRITE))
 147 #define DMA_OFF(__regs)         \
 148 do {    u32 tmp = sbus_readl((__regs) + DMA_CSR); \
 149         tmp &= ~DMA_ENABLE; \
 150         sbus_writel(tmp, (__regs) + DMA_CSR); \
 151 } while(0)
 152 #define DMA_INTSOFF(__regs)     \
 153 do {    u32 tmp = sbus_readl((__regs) + DMA_CSR); \
 154         tmp &= ~DMA_INT_ENAB; \
 155         sbus_writel(tmp, (__regs) + DMA_CSR); \
 156 } while(0)
 157 #define DMA_INTSON(__regs)      \
 158 do {    u32 tmp = sbus_readl((__regs) + DMA_CSR); \
 159         tmp |= DMA_INT_ENAB; \
 160         sbus_writel(tmp, (__regs) + DMA_CSR); \
 161 } while(0)
 162 #define DMA_PUNTFIFO(__regs)    \
 163 do {    u32 tmp = sbus_readl((__regs) + DMA_CSR); \
 164         tmp |= DMA_FIFO_INV; \
 165         sbus_writel(tmp, (__regs) + DMA_CSR); \
 166 } while(0)
 167 #define DMA_SETSTART(__regs, __addr)    \
 168         sbus_writel((u32)(__addr), (__regs) + DMA_ADDR);
 169 #define DMA_BEGINDMA_W(__regs)  \
 170 do {    u32 tmp = sbus_readl((__regs) + DMA_CSR); \
 171         tmp |= (DMA_ST_WRITE|DMA_ENABLE|DMA_INT_ENAB); \
 172         sbus_writel(tmp, (__regs) + DMA_CSR); \
 173 } while(0)
 174 #define DMA_BEGINDMA_R(__regs)  \
 175 do {    u32 tmp = sbus_readl((__regs) + DMA_CSR); \
 176         tmp |= (DMA_ENABLE|DMA_INT_ENAB); \
 177         tmp &= ~DMA_ST_WRITE; \
 178         sbus_writel(tmp, (__regs) + DMA_CSR); \
 179 } while(0)
 180
 181 /* For certain DMA chips, we need to disable ints upon irq entry
 182  * and turn them back on when we are done.  So in any ESP interrupt
 183  * handler you *must* call DMA_IRQ_ENTRY upon entry and DMA_IRQ_EXIT
 184  * when leaving the handler.  You have been warned...
 185  */
 186 #define DMA_IRQ_ENTRY(dma, dregs) do { \
 187         if(DMA_ISBROKEN(dma)) DMA_INTSOFF(dregs); \
 188    } while (0)
 189
 190 #define DMA_IRQ_EXIT(dma, dregs) do { \
 191         if(DMA_ISBROKEN(dma)) DMA_INTSON(dregs); \
 192    } while(0)
 193
 194 #define for_each_dvma(dma) \
 195         for((dma) = dma_chain; (dma); (dma) = (dma)->next)
 196
 197 /* From PCI */
 198
 199 #ifdef CONFIG_PCI
 200 extern int isa_dma_bridge_buggy;
 201 #else
 202 #define isa_dma_bridge_buggy    (0)
 203 #endif
 204
 205 #endif /* !(_ASM_SPARC64_DMA_H) */