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- /* $Id: dma.h,v 1.13 1998/12/16 04:33:55 davem Exp $
- * include/asm-sparc64/dma.h
- *
- * Copyright 1996 (C) David S. Miller (davem@caip.rutgers.edu)
- */
-
- #ifndef _ASM_SPARC64_DMA_H
- #define _ASM_SPARC64_DMA_H
-
- #include <linux/kernel.h>
- #include <linux/types.h>
-
- #include <asm/sbus.h>
- #include <asm/delay.h>
- #include <asm/oplib.h>
- #include <asm/spinlock.h>
-
- extern spinlock_t dma_spin_lock;
-
- #define claim_dma_lock() \
- ({ unsigned long flags; \
- spin_lock_irqsave(&dma_spin_lock, flags); \
- flags; \
- })
-
- #define release_dma_lock(__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 DMA_MODE_READ 1
- #define DMA_MODE_WRITE 2
-
- /* This is actually used. */
- extern unsigned long phys_base;
- #define MAX_DMA_ADDRESS (phys_base + (0xfe000000UL) + PAGE_OFFSET)
-
- /* Useful constants */
- #define SIZE_16MB (16*1024*1024)
- #define SIZE_64K (64*1024)
-
- /* Structure to describe the current status of DMA registers on the Sparc */
- struct sparc_dma_registers {
- __volatile__ __u32 cond_reg; /* DMA condition register */
- __volatile__ __u32 st_addr; /* Start address of this transfer */
- __volatile__ __u32 cnt; /* How many bytes to transfer */
- __volatile__ __u32 dma_test; /* DMA test register */
- };
-
- /* 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 Linux_SBus_DMA {
- struct Linux_SBus_DMA *next;
- struct linux_sbus_device *SBus_dev;
- struct sparc_dma_registers *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 int 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 Linux_SBus_DMA *dma_chain;
-
- /* Broken hardware... */
- #define DMA_ISBROKEN(dma) ((dma)->revision == dvmarev1)
- #define DMA_ISESC1(dma) ((dma)->revision == dvmaesc1)
-
- /* Main routines in dma.c */
- extern void dvma_init(struct linux_sbus *);
-
- /* 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_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_BURST8 0x00040000 /* ENET: SBUS r/w burst size */
- #define DMA_BRST_SZ 0x000c0000 /* SCSI: SBUS r/w burst size */
- #define DMA_BRST64 0x000c0000 /* SCSI: 64byte bursts (HME on UltraSparc only) */
- #define DMA_BRST32 0x00040000 /* SCSI: 32byte bursts */
- #define DMA_BRST16 0x00000000 /* SCSI: 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_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)
-
- #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);
-
- #endif /* !(_ASM_SPARC64_DMA_H) */
-