Date: Sun, 13 Jun 2004 12:42:07 GMT From: Juli Mallett <jmallett@FreeBSD.org> To: Perforce Change Reviews <perforce@freebsd.org> Subject: PERFORCE change 54814 for review Message-ID: <200406131242.i5DCg7sH029721@repoman.freebsd.org>
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http://perforce.freebsd.org/chv.cgi?CH=54814 Change 54814 by jmallett@jmallett_oingo on 2004/06/13 12:41:27 Snag busdma from PowerPC, looks liek this might work out of the box... Affected files ... .. //depot/projects/mips/sys/conf/files.mips#34 edit .. //depot/projects/mips/sys/mips/include/bus.h#5 edit .. //depot/projects/mips/sys/mips/mips/busdma_machdep.c#1 add Differences ... ==== //depot/projects/mips/sys/conf/files.mips#34 (text+ko) ==== @@ -12,6 +12,7 @@ # This stanza is MIPS MD files. mips/mips/autoconf.c standard mips/mips/bus_machdep.c standard +mips/mips/busdma_machdep.c standard mips/mips/critical.c standard mips/mips/elf_machdep.c standard mips/mips/exception.S standard ==== //depot/projects/mips/sys/mips/include/bus.h#5 (text+ko) ==== @@ -79,4 +79,184 @@ /* Map directly through device space. */ extern bus_space_tag_t device_space_tag; +/* BUSDMA below stolen from PowerPC include/bus.h... */ + +/* + * Flags used in various bus DMA methods. + */ +#define BUS_DMA_WAITOK 0x00 /* safe to sleep (pseudo-flag) */ +#define BUS_DMA_NOWAIT 0x01 /* not safe to sleep */ +#define BUS_DMA_ALLOCNOW 0x02 /* perform resource allocation now */ +#define BUS_DMA_COHERENT 0x04 /* hint: map memory DMA coherent */ +#define BUS_DMA_ZERO 0x08 /* allocate zero'ed memory */ +#define BUS_DMA_BUS1 0x10 /* placeholders for bus functions... */ +#define BUS_DMA_BUS2 0x20 +#define BUS_DMA_BUS3 0x40 +#define BUS_DMA_BUS4 0x80 + +/* Forwards needed by prototypes below. */ +struct mbuf; +struct uio; + +/* + * Operations performed by bus_dmamap_sync(). + */ +typedef int bus_dmasync_op_t; +#define BUS_DMASYNC_PREREAD 1 +#define BUS_DMASYNC_POSTREAD 2 +#define BUS_DMASYNC_PREWRITE 4 +#define BUS_DMASYNC_POSTWRITE 8 + +/* + * bus_dma_tag_t + * + * A machine-dependent opaque type describing the characteristics + * of how to perform DMA mappings. This structure encapsultes + * information concerning address and alignment restrictions, number + * of S/G segments, amount of data per S/G segment, etc. + */ +typedef struct bus_dma_tag *bus_dma_tag_t; + +/* + * bus_dmamap_t + * + * DMA mapping instance information. + */ +typedef struct bus_dmamap *bus_dmamap_t; + +/* + * bus_dma_segment_t + * + * Describes a single contiguous DMA transaction. Values + * are suitable for programming into DMA registers. + */ +typedef struct bus_dma_segment { + bus_addr_t ds_addr; /* DMA address */ + bus_size_t ds_len; /* length of transfer */ +} bus_dma_segment_t; + +/* + * A function that returns 1 if the address cannot be accessed by + * a device and 0 if it can be. + */ +typedef int bus_dma_filter_t(void *, bus_addr_t); + +/* + * A function that performs driver-specific syncronization on behalf of + * busdma. + */ +typedef enum { + BUS_DMA_LOCK = 0x01, + BUS_DMA_UNLOCK = 0x02, +} bus_dma_lock_op_t; + +typedef void bus_dma_lock_t(void *, bus_dma_lock_op_t); + +/* + * Allocate a device specific dma_tag encapsulating the constraints of + * the parent tag in addition to other restrictions specified: + * + * alignment: alignment for segments. + * boundary: Boundary that segments cannot cross. + * lowaddr: Low restricted address that cannot appear in a mapping. + * highaddr: High restricted address that cannot appear in a mapping. + * filtfunc: An optional function to further test if an address + * within the range of lowaddr and highaddr cannot appear + * in a mapping. + * filtfuncarg: An argument that will be passed to filtfunc in addition + * to the address to test. + * maxsize: Maximum mapping size supported by this tag. + * nsegments: Number of discontinuities allowed in maps. + * maxsegsz: Maximum size of a segment in the map. + * flags: Bus DMA flags. + * dmat: A pointer to set to a valid dma tag should the return + * value of this function indicate success. + */ +int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment, + bus_size_t boundary, bus_addr_t lowaddr, + bus_addr_t highaddr, bus_dma_filter_t *filtfunc, + void *filtfuncarg, bus_size_t maxsize, int nsegments, + bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc, + void *lockfuncarg, bus_dma_tag_t *dmat); + +int bus_dma_tag_destroy(bus_dma_tag_t dmat); + +/* + * Allocate a handle for mapping from kva/uva/physical + * address space into bus device space. + */ +int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp); + +/* + * Destroy a handle for mapping from kva/uva/physical + * address space into bus device space. + */ +int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map); + +/* + * Allocate a piece of memory that can be efficiently mapped into + * bus device space based on the constraints lited in the dma tag. + * A dmamap to for use with dmamap_load is also allocated. + */ +int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags, + bus_dmamap_t *mapp); + +/* + * Free a piece of memory and it's allociated dmamap, that was allocated + * via bus_dmamem_alloc. + */ +void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map); + +/* + * A function that processes a successfully loaded dma map or an error + * from a delayed load map. + */ +typedef void bus_dmamap_callback_t(void *, bus_dma_segment_t *, int, int); + +/* + * Map the buffer buf into bus space using the dmamap map. + */ +int bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf, + bus_size_t buflen, bus_dmamap_callback_t *callback, + void *callback_arg, int flags); + +/* + * Like bus_dmamap_callback but includes map size in bytes. This is + * defined as a separate interface to maintain compatiiblity for users + * of bus_dmamap_callback_t--at some point these interfaces should be merged. + */ +typedef void bus_dmamap_callback2_t(void *, bus_dma_segment_t *, int, bus_size_t, int); +/* + * Like bus_dmamap_load but for mbufs. Note the use of the + * bus_dmamap_callback2_t interface. + */ +int bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, + struct mbuf *mbuf, + bus_dmamap_callback2_t *callback, void *callback_arg, + int flags); +/* + * Like bus_dmamap_load but for uios. Note the use of the + * bus_dmamap_callback2_t interface. + */ +int bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, + struct uio *ui, + bus_dmamap_callback2_t *callback, void *callback_arg, + int flags); + +/* + * Perform a syncronization operation on the given map. + */ +void bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_dmasync_op_t); + +/* + * Release the mapping held by map. + */ +void bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map); + +/* + * Generic helper function for manipulating mutexes. + */ +void busdma_lock_mutex(void *arg, bus_dma_lock_op_t op); + + #endif /* !_MACHINE_BUS_H_ */
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