| /* 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) */ |
