diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-sparc/io-unit.h | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'include/asm-sparc/io-unit.h')
-rw-r--r-- | include/asm-sparc/io-unit.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/include/asm-sparc/io-unit.h b/include/asm-sparc/io-unit.h new file mode 100644 index 0000000..96823b4 --- /dev/null +++ b/include/asm-sparc/io-unit.h @@ -0,0 +1,62 @@ +/* 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 <asm/page.h> +#include <asm/pgtable.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 *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) + +extern __u32 iounit_map_dma_init(struct sbus_bus *, int); +#define iounit_map_dma_finish(sbus, addr, len) mmu_release_scsi_one(addr, len, sbus) +extern __u32 iounit_map_dma_page(__u32, void *, struct sbus_bus *); + +#endif /* !(_SPARC_IO_UNIT_H) */ |