| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | /* XXX Jakub, find out how to program SBUS streaming cache on XDBUS/sun4d. |
| 33 | * XXX Actually, all you should need to do is find out where the registers |
| 34 | * XXX are and copy over the sparc64 implementation I wrote. There may be |
| 35 | * XXX some horrible hwbugs though, so be careful. -DaveM |
| 36 | */ |
| 37 | #define IOUPTE_STREAM 0x00000040 /* Translation can use streaming cache */ |
| 38 | #define IOUPTE_INTRA 0x00000008 /* SBUS direct slot->slot transfer */ |
| 39 | #define IOUPTE_WRITE 0x00000004 /* Writeable */ |
| 40 | #define IOUPTE_VALID 0x00000002 /* IOPTE is valid */ |
| 41 | #define IOUPTE_PARITY 0x00000001 /* Parity is checked during DVMA */ |
| 42 | |
| 43 | struct iounit_struct { |
| 44 | unsigned long bmap[(IOUNIT_DMA_SIZE >> (PAGE_SHIFT + 3)) / sizeof(unsigned long)]; |
| 45 | spinlock_t lock; |
| 46 | iopte_t *page_table; |
| 47 | unsigned long rotor[3]; |
| 48 | unsigned long limit[4]; |
| 49 | }; |
| 50 | |
| 51 | #define IOUNIT_BMAP1_START 0x00000000 |
| 52 | #define IOUNIT_BMAP1_END (IOUNIT_DMA_SIZE >> (PAGE_SHIFT + 1)) |
| 53 | #define IOUNIT_BMAP2_START IOUNIT_BMAP1_END |
| 54 | #define IOUNIT_BMAP2_END IOUNIT_BMAP2_START + (IOUNIT_DMA_SIZE >> (PAGE_SHIFT + 2)) |
| 55 | #define IOUNIT_BMAPM_START IOUNIT_BMAP2_END |
| 56 | #define IOUNIT_BMAPM_END ((IOUNIT_DMA_SIZE - IOUNIT_DVMA_SIZE) >> PAGE_SHIFT) |
| 57 | |
| 58 | extern __u32 iounit_map_dma_init(struct sbus_bus *, int); |
| 59 | #define iounit_map_dma_finish(sbus, addr, len) mmu_release_scsi_one(addr, len, sbus) |
| 60 | extern __u32 iounit_map_dma_page(__u32, void *, struct sbus_bus *); |
| 61 | |
| 62 | #endif /* !(_SPARC_IO_UNIT_H) */ |