1/* io-unit.h: Definitions for the sun4d IO-UNIT.
2 *
3 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
4 */
5#ifndef _SPARC_IO_UNIT_H
6#define _SPARC_IO_UNIT_H
7
8#include <linux/spinlock.h>
9#include <asm/page.h>
10#include <asm/pgtable.h>
11
12/* The io-unit handles all virtual to physical address translations
13 * that occur between the SBUS and physical memory.  Access by
14 * the cpu to IO registers and similar go over the xdbus so are
15 * translated by the on chip SRMMU.  The io-unit and the srmmu do
16 * not need to have the same translations at all, in fact most
17 * of the time the translations they handle are a disjunct set.
18 * Basically the io-unit handles all dvma sbus activity.
19 */
20
21/* AIEEE, unlike the nice sun4m, these monsters have
22   fixed DMA range 64M */
23
24#define IOUNIT_DMA_BASE	    0xfc000000 /* TOP - 64M */
25#define IOUNIT_DMA_SIZE	    0x04000000 /* 64M */
26/* We use last 1M for sparc_dvma_malloc */
27#define IOUNIT_DVMA_SIZE    0x00100000 /* 1M */
28
29/* The format of an iopte in the external page tables */
30#define IOUPTE_PAGE          0xffffff00 /* Physical page number (PA[35:12])	*/
31#define IOUPTE_CACHE         0x00000080 /* Cached (in Viking/MXCC)		*/
32#define IOUPTE_STREAM        0x00000040 /* Translation can use streaming cache	*/
33#define IOUPTE_INTRA	     0x00000008 /* SBUS direct slot->slot transfer	*/
34#define IOUPTE_WRITE         0x00000004 /* Writeable				*/
35#define IOUPTE_VALID         0x00000002 /* IOPTE is valid			*/
36#define IOUPTE_PARITY        0x00000001 /* Parity is checked during DVMA	*/
37
38struct iounit_struct {
39	unsigned long		bmap[(IOUNIT_DMA_SIZE >> (PAGE_SHIFT + 3)) / sizeof(unsigned long)];
40	spinlock_t		lock;
41	iopte_t			*page_table;
42	unsigned long		rotor[3];
43	unsigned long		limit[4];
44};
45
46#define IOUNIT_BMAP1_START	0x00000000
47#define IOUNIT_BMAP1_END	(IOUNIT_DMA_SIZE >> (PAGE_SHIFT + 1))
48#define IOUNIT_BMAP2_START	IOUNIT_BMAP1_END
49#define IOUNIT_BMAP2_END	IOUNIT_BMAP2_START + (IOUNIT_DMA_SIZE >> (PAGE_SHIFT + 2))
50#define IOUNIT_BMAPM_START	IOUNIT_BMAP2_END
51#define IOUNIT_BMAPM_END	((IOUNIT_DMA_SIZE - IOUNIT_DVMA_SIZE) >> PAGE_SHIFT)
52
53extern __u32 iounit_map_dma_init(struct sbus_bus *, int);
54#define iounit_map_dma_finish(sbus, addr, len) mmu_release_scsi_one(addr, len, sbus)
55extern __u32 iounit_map_dma_page(__u32, void *, struct sbus_bus *);
56
57#endif /* !(_SPARC_IO_UNIT_H) */
58