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author | wdenk <wdenk> | 2001-11-28 17:49:55 (GMT) |
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committer | wdenk <wdenk> | 2001-11-28 17:49:55 (GMT) |
commit | 327f7a020a3037ae8ef6c94488d5e9a3aa772943 (patch) | |
tree | e9cdb59ef86fef010d1133a2589577509afe7523 /cpu/mpc824x/drivers/dma_export.h | |
parent | 12e4407c6a42284671bbcb4acceeedc00df04cb5 (diff) | |
download | u-boot-327f7a020a3037ae8ef6c94488d5e9a3aa772943.tar.xz |
Initial revision
Diffstat (limited to 'cpu/mpc824x/drivers/dma_export.h')
-rw-r--r-- | cpu/mpc824x/drivers/dma_export.h | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/cpu/mpc824x/drivers/dma_export.h b/cpu/mpc824x/drivers/dma_export.h new file mode 100644 index 0000000..cb750dd --- /dev/null +++ b/cpu/mpc824x/drivers/dma_export.h @@ -0,0 +1,100 @@ +#ifndef DMA_EXPORT_H +#define DMA_EXPORT_H + +/**************************************************** + * $Id: + * + * Copyright Motorola 1999 + * + * $Log: + * + ****************************************************/ + +/* These are the defined return values for the DMA_* functions. + * Any non-zero value indicates failure. Failure modes can be added for + * more detailed error reporting. + */ +typedef enum _dma_status +{ + DMA_SUCCESS = 0, + DMA_ERROR, +} DMA_Status; + +/* These are the defined channel transfer types. */ +typedef enum _dma_transfer_types +{ + DMA_M2M = 0, /* local memory to local memory */ + DMA_M2P = 1, /* local memory to PCI */ + DMA_P2M = 2, /* PCI to local memory */ + DMA_P2P = 3, /* PCI to PCI */ +} DMA_TRANSFER_TYPE; + +typedef enum _dma_interrupt_steer +{ + DMA_INT_STEER_LOCAL = 0, /* steer DMA int to local processor */ + DMA_INT_STEER_PCI = 1, /* steer DMA int to PCI bus through INTA_ */ +} DMA_INTERRUPT_STEER; + +typedef enum _dma_channel +{ + DMA_CHN_0 = 0, /* kahlua has two dma channels: 0 and 1 */ + DMA_CHN_1 = 1, +} DMA_CHANNEL; + +typedef enum _dma_snoop_mode +{ + DMA_SNOOP_DISABLE = 0, + DMA_SNOOP_ENABLE = 1, +} DMA_SNOOP_MODE; + +/******************** App. API ******************** + * The application API is for user level application + * to use the functionality provided by DMA driver. + * This is a "generic" DMA interface, it should contain + * nothing specific to the Kahlua implementation. + * Only the generic functions are exported by the library. + * + * Note: Its App.s responsibility to swap the data + * byte. In our API, we currently transfer whatever + * we are given - Big/Little Endian. This could + * become part of the DMA config, though. + **************************************************/ + + +/* Initialize DMA unit with the following: + * optional pointer to application layer print function + * + * These parameters may be added: + * ??? + * Interrupt enables, modes, etc. are set for each transfer. + * + * This function must be called before DMA unit can be used. + */ +extern DMA_Status DMA_Initialize( + int (*app_print_function)(char *,...)); /* pointer to optional "printf" + * provided by application + */ + +/* Perform the DMA transfer, only direct mode is currently implemented. + * At this point, I think it would be better to define a different + * function for chaining mode. + * Also, I'm not sure if it is appropriate to have the "generic" API + * accept snoop and int_steer parameters. The DINK user interface allows + * them, so for now I'll leave them. + * + * int_steer controls DMA interrupt steering to PCI or local processor + * type is the type of transfer: M2M, M2P, P2M, P2P + * source is the source address of the data + * dest is the destination address of the data + * len is the length of data to transfer + * channel is the DMA channel to use for the transfer + * snoop is the snoop enable control + */ +extern DMA_Status DMA_direct_transfer( DMA_INTERRUPT_STEER int_steer, + DMA_TRANSFER_TYPE type, + unsigned int source, + unsigned int dest, + unsigned int len, + DMA_CHANNEL channel, + DMA_SNOOP_MODE snoop); +#endif |