include/asm-sparc/dma.h

   1 /* $Id: dma.h,v 1.35 1999/12/27 06:37:09 anton Exp $
   2  * include/asm-sparc/dma.h
   3  *
   4  * Copyright 1995 (C) David S. Miller (davem@caip.rutgers.edu)
   5  */
   6
   7 #ifndef _ASM_SPARC_DMA_H
   8 #define _ASM_SPARC_DMA_H
   9
  10 #include <linux/config.h>
  11 #include <linux/kernel.h>
  12 #include <linux/types.h>
  13
  14 #include <asm/vac-ops.h>  /* for invalidate's, etc. */
  15 #include <asm/sbus.h>
  16 #include <asm/delay.h>
  17 #include <asm/oplib.h>
  18 #include <asm/system.h>
  19 #include <asm/io.h>
  20 #include <linux/spinlock.h>
  21
  22 extern spinlock_t  dma_spin_lock;
  23
  24 static __inline__ unsigned long claim_dma_lock(void)
  25 {
  26         unsigned long flags;
  27         spin_lock_irqsave(&dma_spin_lock, flags);
  28         return flags;
  29 }
  30
  31 static __inline__ void release_dma_lock(unsigned long flags)
  32 {
  33         spin_unlock_irqrestore(&dma_spin_lock, flags);
  34 }
  35
  36 /* These are irrelevant for Sparc DMA, but we leave it in so that
  37  * things can compile.
  38  */
  39 #define MAX_DMA_CHANNELS 8
  40 #define MAX_DMA_ADDRESS  (~0UL)
  41 #define DMA_MODE_READ    1
  42 #define DMA_MODE_WRITE   2
  43
  44 /* Useful constants */
  45 #define SIZE_16MB      (16*1024*1024)
  46 #define SIZE_64K       (64*1024)
  47
  48 /* SBUS DMA controller reg offsets */
  49 #define DMA_CSR         0x00UL          /* rw  DMA control/status register    0x00   */
  50 #define DMA_ADDR        0x04UL          /* rw  DMA transfer address register  0x04   */
  51 #define DMA_COUNT       0x08UL          /* rw  DMA transfer count register    0x08   */
  52 #define DMA_TEST        0x0cUL          /* rw  DMA test/debug register        0x0c   */
  53
  54 /* DVMA chip revisions */
  55 enum dvma_rev {
  56         dvmarev0,
  57         dvmaesc1,
  58         dvmarev1,
  59         dvmarev2,
  60         dvmarev3,
  61         dvmarevplus,
  62         dvmahme
  63 };
  64
  65 #define DMA_HASCOUNT(rev)  ((rev)==dvmaesc1)
  66
  67 /* Linux DMA information structure, filled during probe. */
  68 struct sbus_dma {
  69         struct sbus_dma *next;
  70         struct sbus_dev *sdev;
  71         unsigned long regs;
  72
  73         /* Status, misc info */
  74         int node;                /* Prom node for this DMA device */
  75         int running;             /* Are we doing DMA now? */
  76         int allocated;           /* Are we "owned" by anyone yet? */
  77
  78         /* Transfer information. */
  79         unsigned long addr;      /* Start address of current transfer */
  80         int nbytes;              /* Size of current transfer */
  81         int realbytes;           /* For splitting up large transfers, etc. */
  82
  83         /* DMA revision */
  84         enum dvma_rev revision;
  85 };
  86
  87 extern struct sbus_dma *dma_chain;
  88
  89 /* Broken hardware... */
  90 #ifdef CONFIG_SUN4
  91 /* Have to sort this out. Does rev0 work fine on sun4[cmd] without isbroken?
  92  * Or is rev0 present only on sun4 boxes? -jj */
  93 #define DMA_ISBROKEN(dma)    ((dma)->revision == dvmarev0 || (dma)->revision == dvmarev1)
  94 #else
  95 #define DMA_ISBROKEN(dma)    ((dma)->revision == dvmarev1)
  96 #endif
  97 #define DMA_ISESC1(dma)      ((dma)->revision == dvmaesc1)
  98
  99 /* Main routines in dma.c */
 100 extern void dvma_init(struct sbus_bus *);
 101
 102 /* Fields in the cond_reg register */
 103 /* First, the version identification bits */
 104 #define DMA_DEVICE_ID    0xf0000000        /* Device identification bits */
 105 #define DMA_VERS0        0x00000000        /* Sunray DMA version */
 106 #define DMA_ESCV1        0x40000000        /* DMA ESC Version 1 */
 107 #define DMA_VERS1        0x80000000        /* DMA rev 1 */
 108 #define DMA_VERS2        0xa0000000        /* DMA rev 2 */
 109 #define DMA_VERHME       0xb0000000        /* DMA hme gate array */
 110 #define DMA_VERSPLUS     0x90000000        /* DMA rev 1 PLUS */
 111
 112 #define DMA_HNDL_INTR    0x00000001        /* An IRQ needs to be handled */
 113 #define DMA_HNDL_ERROR   0x00000002        /* We need to take an error */
 114 #define DMA_FIFO_ISDRAIN 0x0000000c        /* The DMA FIFO is draining */
 115 #define DMA_INT_ENAB     0x00000010        /* Turn on interrupts */
 116 #define DMA_FIFO_INV     0x00000020        /* Invalidate the FIFO */
 117 #define DMA_ACC_SZ_ERR   0x00000040        /* The access size was bad */
 118 #define DMA_FIFO_STDRAIN 0x00000040        /* DMA_VERS1 Drain the FIFO */
 119 #define DMA_RST_SCSI     0x00000080        /* Reset the SCSI controller */
 120 #define DMA_RST_ENET     DMA_RST_SCSI      /* Reset the ENET controller */
 121 #define DMA_RST_BPP      DMA_RST_SCSI      /* Reset the BPP controller */
 122 #define DMA_ST_WRITE     0x00000100        /* write from device to memory */
 123 #define DMA_ENABLE       0x00000200        /* Fire up DMA, handle requests */
 124 #define DMA_PEND_READ    0x00000400        /* DMA_VERS1/0/PLUS Pending Read */
 125 #define DMA_ESC_BURST    0x00000800        /* 1=16byte 0=32byte */
 126 #define DMA_READ_AHEAD   0x00001800        /* DMA read ahead partial longword */
 127 #define DMA_DSBL_RD_DRN  0x00001000        /* No EC drain on slave reads */
 128 #define DMA_BCNT_ENAB    0x00002000        /* If on, use the byte counter */
 129 #define DMA_TERM_CNTR    0x00004000        /* Terminal counter */
 130 #define DMA_SCSI_SBUS64  0x00008000        /* HME: Enable 64-bit SBUS mode. */
 131 #define DMA_CSR_DISAB    0x00010000        /* No FIFO drains during csr */
 132 #define DMA_SCSI_DISAB   0x00020000        /* No FIFO drains during reg */
 133 #define DMA_DSBL_WR_INV  0x00020000        /* No EC inval. on slave writes */
 134 #define DMA_ADD_ENABLE   0x00040000        /* Special ESC DVMA optimization */
 135 #define DMA_E_BURSTS     0x000c0000        /* ENET: SBUS r/w burst mask */
 136 #define DMA_E_BURST32    0x00040000        /* ENET: SBUS 32 byte r/w burst */
 137 #define DMA_E_BURST16    0x00000000        /* ENET: SBUS 16 byte r/w burst */
 138 #define DMA_BRST_SZ      0x000c0000        /* SCSI: SBUS r/w burst size */
 139 #define DMA_BRST64       0x00080000        /* SCSI: 64byte bursts (HME on UltraSparc only) */
 140 #define DMA_BRST32       0x00040000        /* SCSI/BPP: 32byte bursts */
 141 #define DMA_BRST16       0x00000000        /* SCSI/BPP: 16byte bursts */
 142 #define DMA_BRST0        0x00080000        /* SCSI: no bursts (non-HME gate arrays) */
 143 #define DMA_ADDR_DISAB   0x00100000        /* No FIFO drains during addr */
 144 #define DMA_2CLKS        0x00200000        /* Each transfer = 2 clock ticks */
 145 #define DMA_3CLKS        0x00400000        /* Each transfer = 3 clock ticks */
 146 #define DMA_EN_ENETAUI   DMA_3CLKS         /* Put lance into AUI-cable mode */
 147 #define DMA_CNTR_DISAB   0x00800000        /* No IRQ when DMA_TERM_CNTR set */
 148 #define DMA_AUTO_NADDR   0x01000000        /* Use "auto nxt addr" feature */
 149 #define DMA_SCSI_ON      0x02000000        /* Enable SCSI dma */
 150 #define DMA_BPP_ON       DMA_SCSI_ON       /* Enable BPP dma */
 151 #define DMA_PARITY_OFF   0x02000000        /* HME: disable parity checking */
 152 #define DMA_LOADED_ADDR  0x04000000        /* Address has been loaded */
 153 #define DMA_LOADED_NADDR 0x08000000        /* Next address has been loaded */
 154 #define DMA_RESET_FAS366 0x08000000        /* HME: Assert RESET to FAS366 */
 155
 156 /* Values describing the burst-size property from the PROM */
 157 #define DMA_BURST1       0x01
 158 #define DMA_BURST2       0x02
 159 #define DMA_BURST4       0x04
 160 #define DMA_BURST8       0x08
 161 #define DMA_BURST16      0x10
 162 #define DMA_BURST32      0x20
 163 #define DMA_BURST64      0x40
 164 #define DMA_BURSTBITS    0x7f
 165
 166 /* Determine highest possible final transfer address given a base */
 167 #define DMA_MAXEND(addr) (0x01000000UL-(((unsigned long)(addr))&0x00ffffffUL))
 168
 169 /* Yes, I hack a lot of elisp in my spare time... */
 170 #define DMA_ERROR_P(regs)  ((((regs)->cond_reg) & DMA_HNDL_ERROR))
 171 #define DMA_IRQ_P(regs)    ((((regs)->cond_reg) & (DMA_HNDL_INTR | DMA_HNDL_ERROR)))
 172 #define DMA_WRITE_P(regs)  ((((regs)->cond_reg) & DMA_ST_WRITE))
 173 #define DMA_OFF(regs)      ((((regs)->cond_reg) &= (~DMA_ENABLE)))
 174 #define DMA_INTSOFF(regs)  ((((regs)->cond_reg) &= (~DMA_INT_ENAB)))
 175 #define DMA_INTSON(regs)   ((((regs)->cond_reg) |= (DMA_INT_ENAB)))
 176 #define DMA_PUNTFIFO(regs) ((((regs)->cond_reg) |= DMA_FIFO_INV))
 177 #define DMA_SETSTART(regs, addr)  ((((regs)->st_addr) = (char *) addr))
 178 #define DMA_BEGINDMA_W(regs) \
 179         ((((regs)->cond_reg |= (DMA_ST_WRITE|DMA_ENABLE|DMA_INT_ENAB))))
 180 #define DMA_BEGINDMA_R(regs) \
 181         ((((regs)->cond_reg |= ((DMA_ENABLE|DMA_INT_ENAB)&(~DMA_ST_WRITE)))))
 182
 183 /* For certain DMA chips, we need to disable ints upon irq entry
 184  * and turn them back on when we are done.  So in any ESP interrupt
 185  * handler you *must* call DMA_IRQ_ENTRY upon entry and DMA_IRQ_EXIT
 186  * when leaving the handler.  You have been warned...
 187  */
 188 #define DMA_IRQ_ENTRY(dma, dregs) do { \
 189         if(DMA_ISBROKEN(dma)) DMA_INTSOFF(dregs); \
 190    } while (0)
 191
 192 #define DMA_IRQ_EXIT(dma, dregs) do { \
 193         if(DMA_ISBROKEN(dma)) DMA_INTSON(dregs); \
 194    } while(0)
 195
 196 #if 0   /* P3 this stuff is inline in ledma.c:init_restart_ledma() */
 197 /* Pause until counter runs out or BIT isn't set in the DMA condition
 198  * register.
 199  */
 200 extern __inline__ void sparc_dma_pause(struct sparc_dma_registers *regs,
 201                                        unsigned long bit)
 202 {
 203         int ctr = 50000;   /* Let's find some bugs ;) */
 204
 205         /* Busy wait until the bit is not set any more */
 206         while((regs->cond_reg&bit) && (ctr>0)) {
 207                 ctr--;
 208                 __delay(5);
 209         }
 210
 211         /* Check for bogus outcome. */
 212         if(!ctr)
 213                 panic("DMA timeout");
 214 }
 215
 216 /* Reset the friggin' thing... */
 217 #define DMA_RESET(dma) do { \
 218         struct sparc_dma_registers *regs = dma->regs;                      \
 219         /* Let the current FIFO drain itself */                            \
 220         sparc_dma_pause(regs, (DMA_FIFO_ISDRAIN));                         \
 221         /* Reset the logic */                                              \
 222         regs->cond_reg |= (DMA_RST_SCSI);     /* assert */                 \
 223         __delay(400);                         /* let the bits set ;) */    \
 224         regs->cond_reg &= ~(DMA_RST_SCSI);    /* de-assert */              \
 225         sparc_dma_enable_interrupts(regs);    /* Re-enable interrupts */   \
 226         /* Enable FAST transfers if available */                           \
 227         if(dma->revision>dvmarev1) regs->cond_reg |= DMA_3CLKS;            \
 228         dma->running = 0;                                                  \
 229 } while(0)
 230 #endif
 231
 232 #define for_each_dvma(dma) \
 233         for((dma) = dma_chain; (dma); (dma) = (dma)->next)
 234
 235 extern int get_dma_list(char *);
 236 extern int request_dma(unsigned int, __const__ char *);
 237 extern void free_dma(unsigned int);
 238
 239 /* From PCI */
 240
 241 #ifdef CONFIG_PCI
 242 extern int isa_dma_bridge_buggy;
 243 #else
 244 #define isa_dma_bridge_buggy    (0)
 245 #endif
 246
 247 #endif /* !(_ASM_SPARC_DMA_H) */