/* SPDX-License-Identifier: GPL-2.0 */
|
/* 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 <linux/spinlock.h>
|
#include <linux/pgtable.h>
|
#include <asm/page.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) */
|
/* XXX Jakub, find out how to program SBUS streaming cache on XDBUS/sun4d.
|
* XXX Actually, all you should need to do is find out where the registers
|
* XXX are and copy over the sparc64 implementation I wrote. There may be
|
* XXX some horrible hwbugs though, so be careful. -DaveM
|
*/
|
#define IOUPTE_STREAM 0x00000040 /* Translation can use streaming cache */
|
#define IOUPTE_INTRA 0x00000008 /* SBUS direct slot->slot transfer */
|
#define IOUPTE_WRITE 0x00000004 /* Writeable */
|
#define IOUPTE_VALID 0x00000002 /* IOPTE is valid */
|
#define IOUPTE_PARITY 0x00000001 /* Parity is checked during DVMA */
|
|
struct iounit_struct {
|
unsigned long bmap[(IOUNIT_DMA_SIZE >> (PAGE_SHIFT + 3)) / sizeof(unsigned long)];
|
spinlock_t lock;
|
iopte_t __iomem *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) */
|
