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Rabin Vincent
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Dan Williams
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| refs/heads/master: ce2ca1252ba8688a4997b4104793540f4c28c0d8 |
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| /* | ||
| * Freescale MPC83XX / MPC85XX DMA Controller | ||
| * | ||
| * Copyright (c) 2009 Ira W. Snyder <iws@ovro.caltech.edu> | ||
| * | ||
| * This file is licensed under the terms of the GNU General Public License | ||
| * version 2. This program is licensed "as is" without any warranty of any | ||
| * kind, whether express or implied. | ||
| */ | ||
|
|
||
| #ifndef __ARCH_POWERPC_ASM_FSLDMA_H__ | ||
| #define __ARCH_POWERPC_ASM_FSLDMA_H__ | ||
|
|
||
| #include <linux/slab.h> | ||
| #include <linux/dmaengine.h> | ||
|
|
||
| /* | ||
| * Definitions for the Freescale DMA controller's DMA_SLAVE implemention | ||
| * | ||
| * The Freescale DMA_SLAVE implementation was designed to handle many-to-many | ||
| * transfers. An example usage would be an accelerated copy between two | ||
| * scatterlists. Another example use would be an accelerated copy from | ||
| * multiple non-contiguous device buffers into a single scatterlist. | ||
| * | ||
| * A DMA_SLAVE transaction is defined by a struct fsl_dma_slave. This | ||
| * structure contains a list of hardware addresses that should be copied | ||
| * to/from the scatterlist passed into device_prep_slave_sg(). The structure | ||
| * also has some fields to enable hardware-specific features. | ||
| */ | ||
|
|
||
| /** | ||
| * struct fsl_dma_hw_addr | ||
| * @entry: linked list entry | ||
| * @address: the hardware address | ||
| * @length: length to transfer | ||
| * | ||
| * Holds a single physical hardware address / length pair for use | ||
| * with the DMAEngine DMA_SLAVE API. | ||
| */ | ||
| struct fsl_dma_hw_addr { | ||
| struct list_head entry; | ||
|
|
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| dma_addr_t address; | ||
| size_t length; | ||
| }; | ||
|
|
||
| /** | ||
| * struct fsl_dma_slave | ||
| * @addresses: a linked list of struct fsl_dma_hw_addr structures | ||
| * @request_count: value for DMA request count | ||
| * @src_loop_size: setup and enable constant source-address DMA transfers | ||
| * @dst_loop_size: setup and enable constant destination address DMA transfers | ||
| * @external_start: enable externally started DMA transfers | ||
| * @external_pause: enable externally paused DMA transfers | ||
| * | ||
| * Holds a list of address / length pairs for use with the DMAEngine | ||
| * DMA_SLAVE API implementation for the Freescale DMA controller. | ||
| */ | ||
| struct fsl_dma_slave { | ||
|
|
||
| /* List of hardware address/length pairs */ | ||
| struct list_head addresses; | ||
|
|
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| /* Support for extra controller features */ | ||
| unsigned int request_count; | ||
| unsigned int src_loop_size; | ||
| unsigned int dst_loop_size; | ||
| bool external_start; | ||
| bool external_pause; | ||
| }; | ||
|
|
||
| /** | ||
| * fsl_dma_slave_append - add an address/length pair to a struct fsl_dma_slave | ||
| * @slave: the &struct fsl_dma_slave to add to | ||
| * @address: the hardware address to add | ||
| * @length: the length of bytes to transfer from @address | ||
| * | ||
| * Add a hardware address/length pair to a struct fsl_dma_slave. Returns 0 on | ||
| * success, -ERRNO otherwise. | ||
| */ | ||
| static inline int fsl_dma_slave_append(struct fsl_dma_slave *slave, | ||
| dma_addr_t address, size_t length) | ||
| { | ||
| struct fsl_dma_hw_addr *addr; | ||
|
|
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| addr = kzalloc(sizeof(*addr), GFP_ATOMIC); | ||
| if (!addr) | ||
| return -ENOMEM; | ||
|
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| INIT_LIST_HEAD(&addr->entry); | ||
| addr->address = address; | ||
| addr->length = length; | ||
|
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| list_add_tail(&addr->entry, &slave->addresses); | ||
| return 0; | ||
| } | ||
|
|
||
| /** | ||
| * fsl_dma_slave_free - free a struct fsl_dma_slave | ||
| * @slave: the struct fsl_dma_slave to free | ||
| * | ||
| * Free a struct fsl_dma_slave and all associated address/length pairs | ||
| */ | ||
| static inline void fsl_dma_slave_free(struct fsl_dma_slave *slave) | ||
| { | ||
| struct fsl_dma_hw_addr *addr, *tmp; | ||
|
|
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| if (slave) { | ||
| list_for_each_entry_safe(addr, tmp, &slave->addresses, entry) { | ||
| list_del(&addr->entry); | ||
| kfree(addr); | ||
| } | ||
|
|
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| kfree(slave); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * fsl_dma_slave_alloc - allocate a struct fsl_dma_slave | ||
| * @gfp: the flags to pass to kmalloc when allocating this structure | ||
| * | ||
| * Allocate a struct fsl_dma_slave for use by the DMA_SLAVE API. Returns a new | ||
| * struct fsl_dma_slave on success, or NULL on failure. | ||
| */ | ||
| static inline struct fsl_dma_slave *fsl_dma_slave_alloc(gfp_t gfp) | ||
| { | ||
| struct fsl_dma_slave *slave; | ||
|
|
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| slave = kzalloc(sizeof(*slave), gfp); | ||
| if (!slave) | ||
| return NULL; | ||
|
|
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| INIT_LIST_HEAD(&slave->addresses); | ||
| return slave; | ||
| } | ||
|
|
||
| #endif /* __ARCH_POWERPC_ASM_FSLDMA_H__ */ |
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