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/* io-unit.h: Definitions for the sun4d IO-UNIT.
*
* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*/
#ifndef _SPARC_IO_UNIT_H
#define _SPARC_IO_UNIT_H
#include <asm/page.h>
#include <asm/spinlock.h>
/* The io-unit handles all virtual to physical address translations
* that occur between the SBUS and physical memory. Access by
* the cpu to IO registers and similar go over the xdbus so are
* translated by the on chip SRMMU. The io-unit and the srmmu do
* not need to have the same translations at all, in fact most
* of the time the translations they handle are a disjunct set.
* Basically the io-unit handles all dvma sbus activity.
*/
/* AIEEE, unlike the nice sun4m, these monsters have
fixed DMA range 64M */
#define IOUNIT_DMA_BASE 0xfc000000 /* TOP - 64M */
#define IOUNIT_DMA_SIZE 0x04000000 /* 64M */
/* We use last 1M for sparc_dvma_malloc */
#define IOUNIT_DVMA_SIZE 0x00100000 /* 1M */
/* The format of an iopte in the external page tables */
#define IOUPTE_PAGE 0xffffff00 /* Physical page number (PA[35:12]) */
#define IOUPTE_CACHE 0x00000080 /* Cached (in Viking/MXCC) */
#define IOUPTE_STREAM 0x00000040
#define IOUPTE_INTRA 0x00000008 /* Not regular memory - probably direct sbus<->sbus dma
FIXME: Play with this and find out how we can make use of this */
#define IOUPTE_WRITE 0x00000004 /* Writeable */
#define IOUPTE_VALID 0x00000002 /* IOPTE is valid */
#define IOUPTE_PARITY 0x00000001
struct iounit_struct {
unsigned int bmap[(IOUNIT_DMA_SIZE >> (PAGE_SHIFT + 3)) / sizeof(unsigned int)];
spinlock_t lock;
iopte_t *page_table;
unsigned long rotor[3];
unsigned long limit[4];
};
#define IOUNIT_BMAP1_START 0x00000000
#define IOUNIT_BMAP1_END (IOUNIT_DMA_SIZE >> (PAGE_SHIFT + 1))
#define IOUNIT_BMAP2_START IOUNIT_BMAP1_END
#define IOUNIT_BMAP2_END IOUNIT_BMAP2_START + (IOUNIT_DMA_SIZE >> (PAGE_SHIFT + 2))
#define IOUNIT_BMAPM_START IOUNIT_BMAP2_END
#define IOUNIT_BMAPM_END ((IOUNIT_DMA_SIZE - IOUNIT_DVMA_SIZE) >> PAGE_SHIFT)
#endif /* !(_SPARC_IO_UNIT_H) */
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