60 lines
2.4 KiB
C
60 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* io-unit.h: Definitions for the sun4d IO-UNIT.
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*
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* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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*/
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#ifndef _SPARC_IO_UNIT_H
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#define _SPARC_IO_UNIT_H
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#include <linux/spinlock.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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/* The io-unit handles all virtual to physical address translations
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* that occur between the SBUS and physical memory. Access by
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* the cpu to IO registers and similar go over the xdbus so are
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* translated by the on chip SRMMU. The io-unit and the srmmu do
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* not need to have the same translations at all, in fact most
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* of the time the translations they handle are a disjunct set.
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* Basically the io-unit handles all dvma sbus activity.
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*/
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/* AIEEE, unlike the nice sun4m, these monsters have
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fixed DMA range 64M */
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#define IOUNIT_DMA_BASE 0xfc000000 /* TOP - 64M */
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#define IOUNIT_DMA_SIZE 0x04000000 /* 64M */
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/* We use last 1M for sparc_dvma_malloc */
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#define IOUNIT_DVMA_SIZE 0x00100000 /* 1M */
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/* The format of an iopte in the external page tables */
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#define IOUPTE_PAGE 0xffffff00 /* Physical page number (PA[35:12]) */
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#define IOUPTE_CACHE 0x00000080 /* Cached (in Viking/MXCC) */
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/* XXX Jakub, find out how to program SBUS streaming cache on XDBUS/sun4d.
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* XXX Actually, all you should need to do is find out where the registers
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* XXX are and copy over the sparc64 implementation I wrote. There may be
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* XXX some horrible hwbugs though, so be careful. -DaveM
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*/
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#define IOUPTE_STREAM 0x00000040 /* Translation can use streaming cache */
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#define IOUPTE_INTRA 0x00000008 /* SBUS direct slot->slot transfer */
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#define IOUPTE_WRITE 0x00000004 /* Writeable */
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#define IOUPTE_VALID 0x00000002 /* IOPTE is valid */
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#define IOUPTE_PARITY 0x00000001 /* Parity is checked during DVMA */
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struct iounit_struct {
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unsigned long bmap[(IOUNIT_DMA_SIZE >> (PAGE_SHIFT + 3)) / sizeof(unsigned long)];
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spinlock_t lock;
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iopte_t __iomem *page_table;
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unsigned long rotor[3];
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unsigned long limit[4];
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};
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#define IOUNIT_BMAP1_START 0x00000000
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#define IOUNIT_BMAP1_END (IOUNIT_DMA_SIZE >> (PAGE_SHIFT + 1))
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#define IOUNIT_BMAP2_START IOUNIT_BMAP1_END
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#define IOUNIT_BMAP2_END IOUNIT_BMAP2_START + (IOUNIT_DMA_SIZE >> (PAGE_SHIFT + 2))
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#define IOUNIT_BMAPM_START IOUNIT_BMAP2_END
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#define IOUNIT_BMAPM_END ((IOUNIT_DMA_SIZE - IOUNIT_DVMA_SIZE) >> PAGE_SHIFT)
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#endif /* !(_SPARC_IO_UNIT_H) */
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