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dma_32.h

/* include/asm/dma.h
 *
 * Copyright 1995 (C) David S. Miller (davem@davemloft.net)
 */

#ifndef _ASM_SPARC_DMA_H
#define _ASM_SPARC_DMA_H

#include <linux/kernel.h>
#include <linux/types.h>

#include <asm/vac-ops.h>  /* for invalidate's, etc. */
#include <asm/sbus.h>
#include <asm/delay.h>
#include <asm/oplib.h>
#include <asm/system.h>
#include <asm/io.h>
#include <linux/spinlock.h>

struct page;
extern spinlock_t  dma_spin_lock;

static inline unsigned long claim_dma_lock(void)
{
      unsigned long flags;
      spin_lock_irqsave(&dma_spin_lock, flags);
      return flags;
}

static inline void release_dma_lock(unsigned long flags)
{
      spin_unlock_irqrestore(&dma_spin_lock, flags);
}

/* These are irrelevant for Sparc DMA, but we leave it in so that
 * things can compile.
 */
#define MAX_DMA_CHANNELS 8
#define MAX_DMA_ADDRESS  (~0UL)
#define DMA_MODE_READ    1
#define DMA_MODE_WRITE   2

/* Useful constants */
#define SIZE_16MB      (16*1024*1024)
#define SIZE_64K       (64*1024)

/* SBUS DMA controller reg offsets */
#define DMA_CSR         0x00UL            /* rw  DMA control/status register    0x00   */
#define DMA_ADDR  0x04UL            /* rw  DMA transfer address register  0x04   */
#define DMA_COUNT 0x08UL            /* rw  DMA transfer count register    0x08   */
#define DMA_TEST  0x0cUL            /* rw  DMA test/debug register        0x0c   */

/* DVMA chip revisions */
enum dvma_rev {
      dvmarev0,
      dvmaesc1,
      dvmarev1,
      dvmarev2,
      dvmarev3,
      dvmarevplus,
      dvmahme
};

#define DMA_HASCOUNT(rev)  ((rev)==dvmaesc1)

/* Linux DMA information structure, filled during probe. */
struct sbus_dma {
      struct sbus_dma *next;
      struct sbus_dev *sdev;
      void __iomem *regs;

      /* Status, misc info */
      int node;                /* Prom node for this DMA device */
      int running;             /* Are we doing DMA now? */
      int allocated;           /* Are we "owned" by anyone yet? */

      /* Transfer information. */
      unsigned long addr;      /* Start address of current transfer */
      int nbytes;              /* Size of current transfer */
      int realbytes;           /* For splitting up large transfers, etc. */

      /* DMA revision */
      enum dvma_rev revision;
};

extern struct sbus_dma *dma_chain;

/* Broken hardware... */
#ifdef CONFIG_SUN4
/* Have to sort this out. Does rev0 work fine on sun4[cmd] without isbroken?
 * Or is rev0 present only on sun4 boxes? -jj */
#define DMA_ISBROKEN(dma)    ((dma)->revision == dvmarev0 || (dma)->revision == dvmarev1)
#else
#define DMA_ISBROKEN(dma)    ((dma)->revision == dvmarev1)
#endif
#define DMA_ISESC1(dma)      ((dma)->revision == dvmaesc1)

/* Main routines in dma.c */
extern void dvma_init(struct sbus_bus *);

/* Fields in the cond_reg register */
/* First, the version identification bits */
#define DMA_DEVICE_ID    0xf0000000        /* Device identification bits */
#define DMA_VERS0        0x00000000        /* Sunray DMA version */
#define DMA_ESCV1        0x40000000        /* DMA ESC Version 1 */
#define DMA_VERS1        0x80000000        /* DMA rev 1 */
#define DMA_VERS2        0xa0000000        /* DMA rev 2 */
#define DMA_VERHME       0xb0000000        /* DMA hme gate array */
#define DMA_VERSPLUS     0x90000000        /* DMA rev 1 PLUS */

#define DMA_HNDL_INTR    0x00000001        /* An IRQ needs to be handled */
#define DMA_HNDL_ERROR   0x00000002        /* We need to take an error */
#define DMA_FIFO_ISDRAIN 0x0000000c        /* The DMA FIFO is draining */
#define DMA_INT_ENAB     0x00000010        /* Turn on interrupts */
#define DMA_FIFO_INV     0x00000020        /* Invalidate the FIFO */
#define DMA_ACC_SZ_ERR   0x00000040        /* The access size was bad */
#define DMA_FIFO_STDRAIN 0x00000040        /* DMA_VERS1 Drain the FIFO */
#define DMA_RST_SCSI     0x00000080        /* Reset the SCSI controller */
#define DMA_RST_ENET     DMA_RST_SCSI      /* Reset the ENET controller */
#define DMA_RST_BPP      DMA_RST_SCSI      /* Reset the BPP controller */
#define DMA_ST_WRITE     0x00000100        /* write from device to memory */
#define DMA_ENABLE       0x00000200        /* Fire up DMA, handle requests */
#define DMA_PEND_READ    0x00000400        /* DMA_VERS1/0/PLUS Pending Read */
#define DMA_ESC_BURST    0x00000800        /* 1=16byte 0=32byte */
#define DMA_READ_AHEAD   0x00001800        /* DMA read ahead partial longword */
#define DMA_DSBL_RD_DRN  0x00001000        /* No EC drain on slave reads */
#define DMA_BCNT_ENAB    0x00002000        /* If on, use the byte counter */
#define DMA_TERM_CNTR    0x00004000        /* Terminal counter */
#define DMA_SCSI_SBUS64  0x00008000        /* HME: Enable 64-bit SBUS mode. */
#define DMA_CSR_DISAB    0x00010000        /* No FIFO drains during csr */
#define DMA_SCSI_DISAB   0x00020000        /* No FIFO drains during reg */
#define DMA_DSBL_WR_INV  0x00020000        /* No EC inval. on slave writes */
#define DMA_ADD_ENABLE   0x00040000        /* Special ESC DVMA optimization */
#define DMA_E_BURSTS     0x000c0000    /* ENET: SBUS r/w burst mask */
#define DMA_E_BURST32    0x00040000    /* ENET: SBUS 32 byte r/w burst */
#define DMA_E_BURST16    0x00000000    /* ENET: SBUS 16 byte r/w burst */
#define DMA_BRST_SZ      0x000c0000        /* SCSI: SBUS r/w burst size */
#define DMA_BRST64       0x00080000        /* SCSI: 64byte bursts (HME on UltraSparc only) */
#define DMA_BRST32       0x00040000        /* SCSI/BPP: 32byte bursts */
#define DMA_BRST16       0x00000000        /* SCSI/BPP: 16byte bursts */
#define DMA_BRST0        0x00080000        /* SCSI: no bursts (non-HME gate arrays) */
#define DMA_ADDR_DISAB   0x00100000        /* No FIFO drains during addr */
#define DMA_2CLKS        0x00200000        /* Each transfer = 2 clock ticks */
#define DMA_3CLKS        0x00400000        /* Each transfer = 3 clock ticks */
#define DMA_EN_ENETAUI   DMA_3CLKS         /* Put lance into AUI-cable mode */
#define DMA_CNTR_DISAB   0x00800000        /* No IRQ when DMA_TERM_CNTR set */
#define DMA_AUTO_NADDR   0x01000000        /* Use "auto nxt addr" feature */
#define DMA_SCSI_ON      0x02000000        /* Enable SCSI dma */
#define DMA_BPP_ON       DMA_SCSI_ON       /* Enable BPP dma */
#define DMA_PARITY_OFF   0x02000000        /* HME: disable parity checking */
#define DMA_LOADED_ADDR  0x04000000        /* Address has been loaded */
#define DMA_LOADED_NADDR 0x08000000        /* Next address has been loaded */
#define DMA_RESET_FAS366 0x08000000        /* HME: Assert RESET to FAS366 */

/* Values describing the burst-size property from the PROM */
#define DMA_BURST1       0x01
#define DMA_BURST2       0x02
#define DMA_BURST4       0x04
#define DMA_BURST8       0x08
#define DMA_BURST16      0x10
#define DMA_BURST32      0x20
#define DMA_BURST64      0x40
#define DMA_BURSTBITS    0x7f

/* Determine highest possible final transfer address given a base */
#define DMA_MAXEND(addr) (0x01000000UL-(((unsigned long)(addr))&0x00ffffffUL))

/* Yes, I hack a lot of elisp in my spare time... */
#define DMA_ERROR_P(regs)  ((((regs)->cond_reg) & DMA_HNDL_ERROR))
#define DMA_IRQ_P(regs)    ((((regs)->cond_reg) & (DMA_HNDL_INTR | DMA_HNDL_ERROR)))
#define DMA_WRITE_P(regs)  ((((regs)->cond_reg) & DMA_ST_WRITE))
#define DMA_OFF(regs)      ((((regs)->cond_reg) &= (~DMA_ENABLE)))
#define DMA_INTSOFF(regs)  ((((regs)->cond_reg) &= (~DMA_INT_ENAB)))
#define DMA_INTSON(regs)   ((((regs)->cond_reg) |= (DMA_INT_ENAB)))
#define DMA_PUNTFIFO(regs) ((((regs)->cond_reg) |= DMA_FIFO_INV))
#define DMA_SETSTART(regs, addr)  ((((regs)->st_addr) = (char *) addr))
#define DMA_BEGINDMA_W(regs) \
        ((((regs)->cond_reg |= (DMA_ST_WRITE|DMA_ENABLE|DMA_INT_ENAB))))
#define DMA_BEGINDMA_R(regs) \
        ((((regs)->cond_reg |= ((DMA_ENABLE|DMA_INT_ENAB)&(~DMA_ST_WRITE)))))

/* For certain DMA chips, we need to disable ints upon irq entry
 * and turn them back on when we are done.  So in any ESP interrupt
 * handler you *must* call DMA_IRQ_ENTRY upon entry and DMA_IRQ_EXIT
 * when leaving the handler.  You have been warned...
 */
#define DMA_IRQ_ENTRY(dma, dregs) do { \
        if(DMA_ISBROKEN(dma)) DMA_INTSOFF(dregs); \
   } while (0)

#define DMA_IRQ_EXIT(dma, dregs) do { \
      if(DMA_ISBROKEN(dma)) DMA_INTSON(dregs); \
   } while(0)

#if 0 /* P3 this stuff is inline in ledma.c:init_restart_ledma() */
/* Pause until counter runs out or BIT isn't set in the DMA condition
 * register.
 */
static inline void sparc_dma_pause(struct sparc_dma_registers *regs,
                               unsigned long bit)
{
      int ctr = 50000;   /* Let's find some bugs ;) */

      /* Busy wait until the bit is not set any more */
      while((regs->cond_reg&bit) && (ctr>0)) {
            ctr--;
            __delay(5);
      }

      /* Check for bogus outcome. */
      if(!ctr)
            panic("DMA timeout");
}

/* Reset the friggin' thing... */
#define DMA_RESET(dma) do { \
      struct sparc_dma_registers *regs = dma->regs;                      \
      /* Let the current FIFO drain itself */                            \
      sparc_dma_pause(regs, (DMA_FIFO_ISDRAIN));                         \
      /* Reset the logic */                                              \
      regs->cond_reg |= (DMA_RST_SCSI);     /* assert */                 \
      __delay(400);                         /* let the bits set ;) */    \
      regs->cond_reg &= ~(DMA_RST_SCSI);    /* de-assert */              \
      sparc_dma_enable_interrupts(regs);    /* Re-enable interrupts */   \
      /* Enable FAST transfers if available */                           \
      if(dma->revision>dvmarev1) regs->cond_reg |= DMA_3CLKS;            \
      dma->running = 0;                                                  \
} while(0)
#endif

#define for_each_dvma(dma) \
        for((dma) = dma_chain; (dma); (dma) = (dma)->next)

extern int get_dma_list(char *);
extern int request_dma(unsigned int, __const__ char *);
extern void free_dma(unsigned int);

/* From PCI */

#ifdef CONFIG_PCI
extern int isa_dma_bridge_buggy;
#else
#define isa_dma_bridge_buggy  (0)
#endif

/* Routines for data transfer buffers. */
BTFIXUPDEF_CALL(char *, mmu_lockarea, char *, unsigned long)
BTFIXUPDEF_CALL(void,   mmu_unlockarea, char *, unsigned long)

#define mmu_lockarea(vaddr,len) BTFIXUP_CALL(mmu_lockarea)(vaddr,len)
#define mmu_unlockarea(vaddr,len) BTFIXUP_CALL(mmu_unlockarea)(vaddr,len)

/* These are implementations for sbus_map_sg/sbus_unmap_sg... collapse later */
BTFIXUPDEF_CALL(__u32, mmu_get_scsi_one, char *, unsigned long, struct sbus_bus *sbus)
BTFIXUPDEF_CALL(void,  mmu_get_scsi_sgl, struct scatterlist *, int, struct sbus_bus *sbus)
BTFIXUPDEF_CALL(void,  mmu_release_scsi_one, __u32, unsigned long, struct sbus_bus *sbus)
BTFIXUPDEF_CALL(void,  mmu_release_scsi_sgl, struct scatterlist *, int, struct sbus_bus *sbus)

#define mmu_get_scsi_one(vaddr,len,sbus) BTFIXUP_CALL(mmu_get_scsi_one)(vaddr,len,sbus)
#define mmu_get_scsi_sgl(sg,sz,sbus) BTFIXUP_CALL(mmu_get_scsi_sgl)(sg,sz,sbus)
#define mmu_release_scsi_one(vaddr,len,sbus) BTFIXUP_CALL(mmu_release_scsi_one)(vaddr,len,sbus)
#define mmu_release_scsi_sgl(sg,sz,sbus) BTFIXUP_CALL(mmu_release_scsi_sgl)(sg,sz,sbus)

/*
 * mmu_map/unmap are provided by iommu/iounit; Invalid to call on IIep.
 *
 * The mmu_map_dma_area establishes two mappings in one go.
 * These mappings point to pages normally mapped at 'va' (linear address).
 * First mapping is for CPU visible address at 'a', uncached.
 * This is an alias, but it works because it is an uncached mapping.
 * Second mapping is for device visible address, or "bus" address.
 * The bus address is returned at '*pba'.
 *
 * These functions seem distinct, but are hard to split. On sun4c,
 * at least for now, 'a' is equal to bus address, and retured in *pba.
 * On sun4m, page attributes depend on the CPU type, so we have to
 * know if we are mapping RAM or I/O, so it has to be an additional argument
 * to a separate mapping function for CPU visible mappings.
 */
BTFIXUPDEF_CALL(int,  mmu_map_dma_area, dma_addr_t *, unsigned long, unsigned long, int len)
BTFIXUPDEF_CALL(struct page *, mmu_translate_dvma, unsigned long busa)
BTFIXUPDEF_CALL(void,  mmu_unmap_dma_area, unsigned long busa, int len)

#define mmu_map_dma_area(pba,va,a,len) BTFIXUP_CALL(mmu_map_dma_area)(pba,va,a,len)
#define mmu_unmap_dma_area(ba,len) BTFIXUP_CALL(mmu_unmap_dma_area)(ba,len)
#define mmu_translate_dvma(ba)     BTFIXUP_CALL(mmu_translate_dvma)(ba)

#endif /* !(_ASM_SPARC_DMA_H) */

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